TW201829711A - Composition for electrostatic spray and electrostatic spray device - Google Patents

Abstract

Provided is a composition for electrostatic spray capable of suppressing formation of foreign matter in a first electrode of an electrostatic spray device even when sprayed for a long period by the electrostatic spray device. The composition for electrostatic spray includes (a) an active ingredient and (b) an antioxidant component, wherein the ratio (k) of the number of charges provided from the composition to the first electrode and the number of charges supplied from an voltage application unit to a second electrode satisfies 0.01 ≤ k ≤ 50.

Description

Composition for electrostatic spray and electrostatic spray device

The present invention relates to a composition for electrostatic spraying and an electrostatic spray device.

Conventionally, in order to spray an arbitrary active ingredient into a space, an electrostatic spray device using electrohydrodynamics (EHD: Electro Hydrodynamics) has been used. As a composition containing any active component sprayed by such an electrostatic spray device, various compositions are known (see Patent Documents 1 and 2).

For example, the composition of Patent Document 1 has specific electrical conductivity, viscosity, and surface tension.

Further, the composition of Patent Document 2 contains a solvent and an electrolyte having a specific dissociation constant.

[PRIOR ART DOCUMENT] [Patent Document 1] Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. No. 2012-149231 Opened on August 9, 2012)

[Problem to be Solved by the Invention] When a conventional composition is sprayed for a long time by an electrostatic spray device, foreign matter may be formed on the first electrode (spray electrode) of the electrostatic spray device depending on the use conditions.

The present invention has been made in view of the above circumstances. An object of the present invention is to provide a composition for electrostatic spraying capable of suppressing formation of foreign matter on the first electrode of the electrostatic spray device even when it is sprayed for a long time by an electrostatic spray device.

The composition for electrostatic spraying according to one aspect of the present invention is used for electrostatic spraying for spraying from the front end of the first electrode by applying a voltage between the first electrode and the second electrode of the electrostatic spray device by the voltage applying portion. In the composition, the composition contains (a) an active ingredient and (b) an antioxidant component, and k represented by the following formula (1) satisfies 0.01 ≤ k ≤ 50, and in the following formula (1), the above composition is supplied to the above-mentioned composition. The number of charges of the first electrode is represented by the following formula (2). In the following formula (1), the number of charges supplied from the voltage application unit to the second electrode is represented by the following formula (3).

k = (number of charges supplied from the composition to the first electrode) / (number of charges supplied from the voltage applying portion to the second electrode)... Formula (1) Number of charges supplied from the composition to the first electrode = antioxidant component The molar concentration (mol / l) × the number of electrons supplied to the first electrode by the molecule of the antioxidant component × spray amount (l / s) × Yafocan 厥 constant (mol ^-1 ) ... (2) by voltage The number of charges supplied by the application portion to the second electrode = current (C / s) / meta-charge (C) ... (3)

[Effect of the Invention] The composition for electrostatic spraying according to one aspect of the present invention has an effect of suppressing the formation of foreign matter on the first electrode of the electrostatic spray device even when it is used for a long period of time by the electrostatic spray device.

[Concept of the Invention] The inventors have noticed that when a conventional composition is sprayed for a long time by an electrostatic spray device, foreign matter may be formed on the first electrode (spray electrode) of the electrostatic spray device depending on the use conditions. Then, the inventors confirmed that once the foreign matter is formed on the first electrode, the spray performance of the electrostatic spray device is lowered.

Usually, in order to ensure good spray performance, the electrode used in the electrostatic spray device (specifically, the first electrode and the second electrode) is replaced with a new electrode each time a certain amount of the composition is sprayed (in other words, every time period of use). . Considering the environmental load, when trying to spray a larger amount of the composition with the same electrode, or trying to use the same electrode longer than before, the inventors found that the electrode (in other words, the first electrode) sprayed out of the composition would Form a foreign body.

In order to clarify the cause of foreign matter formation on the first electrode, the inventors analyzed the above foreign matter, and as a result, found that the main component of the foreign matter is a metal oxide derived from the component of the first electrode. Based on this result, the inventors assumed that foreign matter was generated in the following steps (1) to (6). Referring to Fig. 12, the details will be described below. Fig. 12 is a view showing the reason why foreign matter is generated at the front end of the first electrode. In the following, although the case where the first electrode is made of SUS is exemplified and described, the first electrode is not limited to SUS. (1) applying a voltage between the first electrode and the second electrode by the voltage applying portion, and causing the first electrode to have a higher potential than the second electrode, whereby the electron (e ^- ) moves from the first electrode to the first electrode Two electrodes. (2) The electrons released from the first electrode are derived from the electrons of the composition, so that a composition with + (positive) electricity is sprayed from the first electrode. On the other hand, electrons released from the first electrode and electrons supplied from the voltage applying portion are released from the front end of the second electrode. (3) When electrons are released from the first electrode to the second electrode, when the composition is unable to sufficiently supply electrons to the first electrode, electrons are released from the metal (mainly iron) constituting the first electrode itself. (4) Iron ionization occurs when iron releases electrons (Fe→Fe ^{2 +} +2e ^- , in other words, iron oxidation) (again, although it is a small amount compared to iron, a metal other than iron (such as manganese) Oxidation also occurs). (5) The above iron ions are combined with oxygen in the air, and the iron oxide is attached to the front end of the first electrode. (6) The iron oxide accumulates at the front end of the first electrode as a certain amount of the composition and the electrostatic spray device are sprayed for a certain period of time. Fig. 13 shows an example of iron oxide accumulated at the front end of the first electrode.

As shown in Fig. 13, when the composition is sprayed with the first electrode to which the metal oxide is attached at the tip end, there are particles (in other words, a composition) which cannot float (diffusion) and float in the air. The presence of such a composition can be confirmed by the method shown in FIG. Figure 14 is a view showing a method of detecting a portion of a composition which does not diffuse into the air with an oil-sensitive paper when the first electrode spray composition shown in Figure 13 is used. Specifically, when the composition was sprayed in the horizontal direction by the first electrode shown in Fig. 13, the oil-sensitive paper was placed about 15 cm vertically below the first electrode. In the sprayed composition, a part of the composition (particles) which cannot float (diffuse) in the air will fall on the oil sensitive paper. The falling composition is indicated as a black spot on the oil sensitive paper. Fig. 15 shows an oil-sensitive paper obtained by the method shown in Fig. 14.

The reason why the sprayed composition cannot float in the air is that the composition has a large particle size. Therefore, from Fig. 13 to Fig. 15, it is understood that when the first electrode spray composition of the metal oxide attached to the tip is used, the particle size of the sprayed composition cannot be controlled, and as a result, the composition of the large particle is also sprayed. portion. This is considered to be because the metal oxide is attached to the front end of the first electrode, so that the Taylor cone formed at the tip end of the first electrode becomes unstable when the composition is sprayed.

In order to solve the above problem (in other words, the subject), the inventors conducted intensive studies. As a result, it is apparent that the ratio (k) of the amount of charge supplied from the composition to the first electrode to the amount of charge supplied from the voltage applying portion to the second electrode is within a desired range, that is, when 0.01 ≤ K ≤ 50 is satisfied. Can solve the above problems. Hereinafter, an embodiment of the present invention will be described.

[Embodiment 1] Hereinafter, an electrostatic spray device 100 according to Embodiment 1 will be described with reference to Figs. 1 to 3 . In the following description, the same components and constituent elements will be denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions about them will not be repeated.

[Electrostatic Spray Device 100] The electrostatic spray device 100 is a device for spraying an aromatic oil, a chemical for agricultural products, a pharmaceutical, a pesticide, an insecticide, an air purifying agent, etc., and includes a spray electrode (first electrode) 1 , a reference electrode (second electrode) 2, and a power supply device 3.

First, the appearance of the electrostatic spray device 100 will be described with reference to FIG. FIG. 2 is a view for explaining the appearance of the electrostatic spray device 100.

As shown, the electrostatic spray device 100 has a rectangular shape. The spray electrode 1 and the reference electrode 2 are provided on one surface of the electrostatic spray device 100. The spray electrode 1 is located in the vicinity of the reference electrode 2. Further, an annular opening 11 is formed to surround the spray electrode 1, and an annular opening 12 is formed so as to surround the reference electrode 2, and these are formed separately.

A voltage is applied between the spray electrode 1 and the reference electrode 2, whereby an electric field is formed between the spray electrode 1 and the reference electrode 2. The positively charged droplets (in other words, the composition) are sprayed from the spray electrode 1. The reference electrode 2 negatively charges the air in the vicinity of the electrode to ionize the air in the vicinity of the electrode. Then, the negatively charged air moves away from the reference electrode 2 by the repulsive force between the electric field formed between the electrodes and the negatively charged air particles. This movement produces an air flow (hereinafter, sometimes referred to as an ion flow) by which the positively charged droplets are sprayed away from the electrostatic spray device 100.

The electrostatic spray device 100 may not have a rectangular shape but other shapes. In addition, the opening 11 and the opening 12 may be different from the annular shape, and the opening size thereof may be appropriately adjusted.

[Spray Electrode 1 and Reference Electrode 2] The spray electrode 1 and the reference electrode 2 will be described with reference to Fig. 3 . 3 is a view for explaining the spray electrode 1 and the reference electrode 2.

The spray electrode 1 has a conductive conduit such as a metal capillary (for example, 304 stainless steel, copper, aluminum, titanium, or nickel) and a front end portion 5 as a front end portion. The spray electrode 1 is electrically connected to the reference electrode 2 by the power supply device 3. The spray material (in other words, the composition described in the present specification, hereinafter also referred to as "liquid") is present in the conductive conduit, and the spray material is sprayed from the distal end portion 5. The spray electrode 1 has an inclined surface 9 that is inclined with respect to the axial center of the spray electrode 1, and has a sharper shape toward the tip end of the distal end portion 5.

The reference electrode 2 is made of a conductive rod such as a metal pin (for example, a 304-type steel pin, copper, aluminum, titanium, nickel, or the like). The spray electrode 1 and the reference electrode 2 are spaced apart at a predetermined interval and disposed in parallel with each other. The spray electrode 1 and the reference electrode 2 are provided, for example, at intervals of 8 mm.

The power supply device 3 applies a high voltage between the spray electrode 1 and the reference electrode 2. For example, the power supply device 3 applies a high voltage (for example, 3 to 7 kV) between the spray electrode 1 and the reference electrode 2 between 1 and 30 kV. Once a high voltage is applied, an electric field is formed between the electrodes, creating an electric dipole inside the dielectric 10. At this time, the spray electrode 1 is positively charged, and the reference electrode 2 is negatively charged (or vice versa). Then, a negative dipole is generated on the surface of the dielectric 10 closest to the positive spray electrode 1, and a positive dipole is generated on the surface of the dielectric 10 closest to the negative reference electrode 2, and the charged gas and species are released by the spray electrode 1 and the reference electrode 2. . Here, as described above, the electric charge generated in the reference electrode 2 has a charge having a polarity opposite to the polarity of the liquid. Therefore, the charge of the liquid is balanced by the charge generated in the reference electrode 2. Therefore, the electrostatic spray device 100 can achieve spray stability based on the principle of charge balance.

As described above, the electrostatic spray device 100 is configured such that a liquid can be sprayed from the front end (front end portion 5) of the spray electrode 1 by applying a voltage between the spray electrode 1 and the reference electrode 2.

The dielectric 10 is made of, for example, a dielectric material such as nylon (for example, nylon 6, nylon 11, nylon 12, and nylon 66) polypropylene or a polyethylene-polytetrafluoroethylene mixture. In the dielectric 10, the spray electrode 1 is supported by the spray electrode mounting portion 6, and the reference electrode 2 is supported by the reference electrode mounting portion 7.

[Power Supply Device 3] The power supply device 3 will be described with reference to Fig. 1 . Fig. 1 is a functional block diagram showing the configuration of a main part of the electrostatic spray device 100.

The power supply device 3 includes a power supply 21, a high voltage generating device (voltage applying portion) 22, and a control circuit (control portion) 24. The high voltage generating device 22 may also be referred to as a PU (Power Unit).

The power source 21 provides the power source required for the electrostatic spray device 100 to operate. The power source 21 can be a known power source, including a main power source or more than one battery. The power source 21 is preferably a low voltage power source or a direct current (DC) power source, for example, a combination of one or more dry batteries. The number of batteries depends on the required voltage level and the power consumption of the power supply. The power source 21 supplies DC power (in other words, DC current and DC voltage) to the oscillator 221 of the high voltage generating device 22.

The high voltage generating device 22 includes an oscillator 221, a transformer 222, and a converter circuit 223. The oscillator 221 converts DC power (in other words, DC current and DC voltage) into AC power (in other words, AC current and AC voltage). Transformer 222 is coupled to oscillator 221. Transformer 222 converts the magnitude of the alternating current current (or the magnitude of the alternating current). Converter circuit 223 is coupled to transformer 222. The converter circuit 223 generates a desired voltage and converts alternating current power (in other words, alternating current and alternating current) into direct current power (in other words, direct current and direct current voltage). Typically, converter circuit 223 includes a supply pump and a rectifier circuit. A typical converter circuit is a Cockroft-Walton circuit.

The control circuit 24 outputs a PWM (Pulse Width Modulation) signal set to a constant value to the oscillator 221. The PWM system controls the current and/or voltage by changing the time (pulse width) of the output pulse signal. The pulse signal is an electrical signal that is repeatedly turned "ON" or "OFF". For example, the pulse signal is represented by a rectangular wave, and the horizontal axis of the rectangular wave indicates the pulse width as a voltage output time.

In the PWM mode, a timer (timed automatic switch) that operates at a certain period is used. The pulse width is controlled by setting the position at which the pulse signal is turned on in the timer. The ratio of turning on the pulse signal in a certain period is called "duty cycle" (also called "working ratio").

Control circuit 24 includes a microprocessor 241 for various purposes. The microprocessor 241 can also be designed as follows: based on the feedback information (ambient information) 25, the duty cycle of the PWM signal can be further adjusted.

The feedback information 25 includes environmental conditions (temperature, humidity, and/or atmospheric pressure), amount of liquid, and arbitrary settings of the user. This information is provided to the microprocessor 241 as analog information or digital information, and is processed by the microprocessor 241. The microprocessor 241 can also be designed to compensate by changing any of the spray interval, spray opening time or applied voltage based on the input information to improve spray quality and stability. In addition, in this specification, "spray" means the spray of a composition.

As an example, the power supply device 3 includes a temperature detecting element such as a thermistor for compensating for temperature. At this time, the power supply device 3 changes the spray interval in accordance with the temperature change detected by the temperature detecting element. The spray interval is a spray interval of the liquid in which the electrostatic spray device 100 is sprayed out of the liquid and the time at which the spray is stopped is one cycle. For example, assume a spray (ON) for 35 seconds (during the spray, the power supply applies a high voltage between the first electrode and the second electrode), stop spraying (OFF) for 145 seconds (during the stop of the spray, the power supply is not at the first electrode with A periodic spray interval in which a high voltage is applied between the second electrodes. In this case, the spray interval is 35 seconds + 145 seconds = 180 seconds.

The spray interval can be changed by the software of the microprocessor 241 built into the power source. The spray interval can be controlled to increase from the set point when the temperature rises and to decrease from the set point when the temperature drops. It is preferable to follow the established index to increase and shorten the spray interval, and determine the established index according to the characteristics of the liquid to be sprayed. For convenience, the amount of compensation variation of the spray interval can be limited as follows: The spray interval varies only between 0 and 60 ° C (eg, 10 to 45 ° C). Therefore, the extreme temperature detected and recorded by the temperature detecting element is considered to be erroneous and is not considered, and an acceptable spray interval is set for high temperature and low temperature, even if it is not optimal.

As shown in FIG. 1, as the feedback information 25, the measurement result of the temperature sensor 251, the measurement result of the humidity sensor 252, the measurement result of the pressure sensor 253, and the information 254 about the liquid content can be cited (for example, the measurement using the liquid level meter) The result of the liquid storage result), the measurement result of the voltage and current sensor 255, and the like. In addition, the information 254 about the liquid contents may also contain information indicative of the viscosity of the liquid (e.g., information indicative of the result of measuring the viscosity of the liquid using a viscosity sensor (not shown)).

Here, the information indicating the surrounding environment of the electrostatic spray device 100 is referred to as surrounding environment information. As information about the surrounding environment, feedback information 25 can be used.

As an example, the surrounding environment information may include information on at least one of temperature (temperature), humidity, and air pressure around the electrostatic spray device 100. In the first embodiment, the ambient environment information is included (i) information indicating the temperature of the surroundings of the electrostatic spray device 100 (temperature information) and (ii) information indicating the humidity around the electrostatic spray device 100 (humidity information). The situation is explained.

Typically, control circuit 24 has an output port for outputting information from microprocessor 241, through which the PWM signal is output to oscillator 221. The spray duty cycle and the spray interval can also be controlled by the same output port as the output port of the output PWM signal. The PWM signal is output from the control circuit 24 to the oscillator 221 while the electrostatic spray device 100 is spraying the liquid.

The control circuit 24 can control the output voltage of the high voltage generating device 22 by controlling the amplitude magnitude, frequency, duty factor, or voltage ON/OFF time (or combinations thereof) of the alternating current of the oscillator 221.

[Modification of the first embodiment] In the first embodiment, for the sake of simplification of the description, the conventional feedback control (for example, current feedback control, voltage feedback control, current/voltage feedback control, and output power feedback control) is exemplified. The composition of the electrostatic spray device. However, in the electrostatic spray device of one embodiment of the present invention, conventional feedback control can be applied to further improve spray stability.

[Effect of Electrostatic Spray Device 100] As described above, the electrostatic spray device 100 of the first embodiment includes a spray electrode (first electrode) 1, a reference electrode (second electrode) 2, and a power supply device 3. Thereby, an electric field can be formed between the spray electrode 1 and the reference electrode 2. Then, by using the electric field, a composition containing any active ingredient can be sprayed from the front end of the spray electrode 1 (in other words, sprayed after atomization).

[Embodiment 2] [Composition] Hereinafter, the composition of Embodiment 2 will be described. The composition of the second embodiment is applied from the spray electrode by applying a voltage between the spray electrode (first electrode) of the electrostatic spray device and the reference electrode (second electrode) by a high voltage generator (voltage application unit). In the composition for electrostatic spraying of the front-end spray, the composition contains (a) an active ingredient and (b) an antioxidant component, and K represented by the following formula (1) satisfies 0.01 ≤ K ≤ 50, and in the following formula (1), The number of charges supplied from the composition to the first electrode is represented by the following formula (2), and in the following formula (1), the number of charges supplied from the voltage applying portion to the second electrode is represented by the following formula (3), which is an electrostatic The composition for spraying: k = (the number of charges supplied from the composition to the first electrode) / (the number of charges supplied from the voltage applying portion to the second electrode)... Formula (1) is supplied from the composition to the first electrode The number of charges = the molar concentration of the antioxidant component (mol / l) × the number of electrons supplied to the first electrode by one molecule of the antioxidant component × the amount of spray (l / s) × the Yafoxan constant (mol ^-1 )... Formula (2) is supplied from the voltage applying portion to the second electrode = Number of charge current (C / s) / an elementary charge (C) ... of formula (3).

In this specification, "(a) active ingredient" may be referred to as "(a) component" or "(a)". In this specification, "(b) antioxidant component" may be referred to as "(b) component" or "(b)".

In this specification, the Yafoga 厥 constant uses the 2014 recommended value published by the Committee on Science and Technology (CODATA). Ya Fojia specifically Jue constant ^{6.022140857 (74) × 10 23 mol} - 1. The number in parentheses, in other words 74, represents the last two digits of 6.022140857, in other words, the uncertainty of 57.

In this specification, the elementary charge uses the 2014 recommended value published by the Scientific and Technical Data Committee. The elemental charge is specifically 1.6021766208 (98) × 10 ^{- 19} C. The numbers in parentheses indicate the uncertainty of the last two digits of 1.6021766208.

In the process of seeking the 佛 厥 厥 constant and the elementary charge, as a result of further scientific precision, the value of the Yafot 厥 constant and the elemental charge may be different from the above values. When the values of the Yafotian constant and the metacharge become different values in the future, the expected value of k can also be changed based on the new value.

Furthermore, the unit of current "C/s" can also be replaced by the unit "A" (Amp). Because 1 C/s = 1 A.

The composition of the second embodiment is preferably sprayed by the electrostatic spray device 100.

The spray electrode, the reference electrode, and the high voltage generator of the second embodiment may be the spray electrode, the reference electrode, and the high voltage generator of the first embodiment.

In the composition of the second embodiment, the above k satisfies 0.01 ≤ k ≤ 50. k is preferably 0.01 ≤ k ≤ 15, more preferably 0.01 ≤ k ≤ 13, and most preferably 0.03 ≤ k ≤ 10. When k is less than 0.01, since the composition is sprayed for a long time, foreign matter adheres to the front end of the spray electrode of the electrostatic spray device, whereby a stable Taylor cone cannot be formed at the front end of the spray electrode. When k is more than 50, since the composition is sprayed for a long time, the (b) antioxidant component in the composition is precipitated at the front end of the spray electrode of the electrostatic spray device, thereby preventing formation of a stable Taylor cone at the front end of the spray electrode. Here, the term "Taylor cone" refers to a region of a tapered shape (in other words, a conical shape) formed of a composition at the front end of the spray electrode of the electrostatic spray device when the composition is sprayed. The so-called stable Taylor cone refers to a Taylor cone that always maintains a certain shape from the start to the end of the spray of the composition.

It is assumed that a voltage is applied between the first electrode and the second electrode by the voltage applying portion such that the potential of the first electrode is higher than that of the second electrode. In this case, the current flowing from the second electrode to the first electrode is preferably 0.01 μC/s to 1000 μC/s, preferably 0.1 μC/s to 100 μC/s, and more preferably 0.2 μC/s to 20 μC/s. Preferably, 0.5 μC/s to 5 μC/s is optimal. When the electric current is within the above range, foreign matter is formed on the spray electrode of the electrostatic spray device after the spray composition is suppressed, and the Taylor cone has the advantage of long-term stability.

<(a) Active ingredient> The (a) active ingredient is an active ingredient required to perform a desired process on a process object (process object). As the (a) active ingredient, an optional component can be selected depending on the purpose of the treatment. Examples of the (a) active ingredient include a fragrance, an insecticide, an air purifying agent, and the like, but are not limited thereto. Further, (a) the active ingredient may be hydrophilic or oily.

Specific examples and preferred examples of the above-mentioned flavoring and air purifying agent include the flavoring and air purifying agents described in JP-A-2012-149231.

Specific examples and preferred examples of the above-mentioned insecticides include the insecticides described in Japanese Laid-Open Patent Publication No. 2014/088050.

In the composition of the second embodiment, (a) the active ingredient is preferably contained in an amount of 0.1 to 30 w/w%, more preferably 0.1 to 28 w/w%, and preferably 0.3 to 25 w/w, based on the total amount of the composition. % is more preferable, and 0.5 to 20 w/w% is optimal. (a) When the active ingredient is in the above range, the effect of (a) the active ingredient can be sufficiently exhibited, and even if (a) the active ingredient is oily, there is no fear that the composition is separated by (a) the active ingredient.

<(b) Antioxidant component> Although the (b) antioxidant component is not particularly limited, it is selected from the group consisting of ascorbic acid, sodium ascorbate, tocopherol, and dibutylhydroxytoluene. At least one of a group consisting of butylhydroxyanisole and tert-butylhydroquinone is preferred. The antioxidant component may be selected from two or more selected from the above group.

The tocopherol may, for example, be α-tocopherol, β-tocopherol or γ-tocopherol.

In the composition of the second embodiment, (b) the antioxidant component is preferably 0.0001 to 1 w/w%, more preferably 0.0001 to 0.8 w/w%, and more preferably 0.0001 to 0.5%, based on the total amount of the composition. The w/w% is more preferably, and it is preferably 0.0005 to 0.3 w/w%. When the (b) antioxidant component contained in the composition is within the above range with respect to the total amount of the composition, there is an advantage that formation of a foreign matter on the spray electrode of the electrostatic spray device after the use of the composition can be suppressed.

<(c) alcohol> The composition of the second embodiment includes (c) alcohol preferably having an evaporation rate of 0.4 or more, and the evaporation rate is preferably 0.6 or more. (c) Alcohol is preferable, and the evaporation rate is included. (c) Alcohol is preferably more than 0.8. Here, the above evaporation rate is a relative value when the evaporation rate of butyl acetate is 1. The evaporation rate can be measured by the method of ASTM D3539-87. The composition contains the above-mentioned (c) alcohol having an evaporation rate of 0.4 or more, so that the evaporation rate of the composition can be increased. Due to the high evaporation rate of the composition, the particles of the sprayed composition gradually decrease in volume in the air and become smaller particles more quickly. Therefore, the active ingredient contained in the composition diffuses widely into the air. Thus, the composition containing (c) alcohol having an evaporation rate of 0.4 or more has an advantage that it is possible to suppress the particle size from becoming small after the spraying and the particles falling before being diffused.

In the present specification, "(c) alcohol" having an evaporation rate of 0.4 or more is sometimes referred to as "(c) alcohol", "(c) component" or "(C)".

Although (c) alcohol is not particularly limited, it can be exemplified by ethanol (evaporation rate = 1.5), isopropyl alcohol (evaporation rate = 1.5), and 1-butanol (evaporation rate). =0.47) and so on. Among these, ethanol and isopropanol are preferred from the viewpoint of evaporation rate.

The following points may be considered to appropriately set the (c) alcohol content contained in the composition: (1) the physical properties of (a) and (b) contained in the composition; and (2) the composition should be A homogeneous liquid preparation.

When the composition of the second embodiment contains (c) alcohol having an evaporation rate of 0.4 or more, it is preferable to contain water at the same time. In the case of a mixture of water and alcohol, the boiling point of the mixture can be lowered by azeotropy. That is to say, according to this configuration, by increasing the evaporation rate of the composition, the particles of the sprayed composition become smaller particles in the air more quickly, and as a result, the active ingredient diffuses more widely into the air. Therefore, the composition having the above constitution has an advantage that it is possible to better suppress that the particle diameter does not become small after spraying and that the particles fall before diffusion.

In the composition of the second embodiment, the water and the evaporation rate are 0.4 or more. (c) The alcohol is preferably contained in an amount of 5 to 50 w/w% based on the total amount of the composition. In other words, in the composition of the second embodiment, the water and the evaporation rate are 0.4 or more, and the total amount of the (c) alcohol is preferably 5 to 50 w/w% based on the total amount of the composition. In the composition, water and (c) alcohol are preferably 5 to 47 w/w% based on the total amount of the composition, more preferably 5 to 45 w/w%, and most preferably 6 to 40 w/w%. good. When the composition contains water and (c) the alcohol is in the above range with respect to the total amount of the composition, there is an advantage in that it is not necessary to precipitate the component (b) and the composition is separated by the component (a).

<(d) Other components and solvent> The composition of the second embodiment may contain (d) other components as long as the effects of the components (a), (b) and (c) and the physical properties of the components are not affected. The nature can be. Examples of the other component (d) include an electrolyte, a dispersant, an emulsifier, a gasification accelerator, a surface tension adjusting component, and a viscosity adjusting component.

In the present specification, "(d) other components" may also be referred to as "(d) component" or simply "(d)".

In addition to the components (a) to (d) above, the composition of the second embodiment may further contain a solvent which is liquid at normal temperature. In the present specification, "normal temperature" means a range of 5 ° C or more and 35 ° C or less (20 ± 15 ° C) prescribed in JIS Z 8703 (standard state of a test site). The solvent is not particularly limited as long as it does not affect the effects of the respective components (a) to (d) or the physical properties of the components (a) to (d). Specific examples of such a solvent include the solvents described in JP-A-2012-149231.

[Effect of the second embodiment] As described above, the composition of the second embodiment contains (a) an active component and (b) an antioxidant component, and the number of charges supplied from the composition to the first electrode is supplied to the first electrode by the voltage application unit. The ratio (k) of the number of charges of the two electrodes satisfies 0.01 ≤ k ≤ 50. Thereby, (1) the object to be processed can be processed according to the purpose, and (2) even if the composition is used for a long time by the electrostatic spray device, it is possible to provide a foreign matter capable of suppressing formation of the foreign matter derived from the first electrode in the first electrode And/or a composition for an electrostatic spray device derived from foreign matter of component (b).

[Embodiment 3] Hereinafter, a spraying method of the composition of Embodiment 3 will be described.

The spraying method of the composition of the third embodiment, [1] the spraying method of the composition for electrostatic spraying, comprising a spray electrode (first electrode) and a reference electrode of the electrostatic spray device by a high voltage generating device (voltage applying unit) a step of spraying a composition for electrostatic spraying from a front end of the spray electrode (first electrode) with a voltage applied between the second electrodes, wherein the composition contains (a) an active ingredient and (b) an antioxidant component, in the above composition In the following formula (1), k is represented by the following formula (1), and the number of charges supplied from the above composition to the first electrode is represented by the following formula (2), In 1), the number of charges supplied from the voltage applying portion to the second electrode is represented by the following formula (3), which is a spraying method of the composition for electrostatic spraying: k = (provided by the composition to the first electrode Number of charges) / (number of charges supplied from the voltage applying portion to the second electrode) (1) Number of charges supplied from the composition to the first electrode = molar concentration of the antioxidant component (mol / l) × by oxidation resistance 1 molecule of the component The number of electrons supplied to the first electrode × the amount of spray (l/s) × the yaw gamma constant (mol ^-1 )... (2) The number of charges supplied to the second electrode by the voltage application unit = current (C/s ) / elemental charge (C) ... formula (3).

In the spraying method of the composition of the third embodiment, it is preferred to spray the composition of the second embodiment.

It is preferred to use the electrostatic spray device of the first embodiment to carry out the spray method of the composition of the third embodiment.

Further, the spraying method of the composition of one embodiment of the present invention may be configured as follows.

[2] The spraying method according to [1], wherein the (a) active ingredient contained in the composition is 0.1 to 30 w/w% based on the total amount of the composition.

[3] The spraying method according to [1] or [2], wherein the (b) antioxidant component contained in the composition is 0.0001 to 1 w/w% based on the total amount of the composition.

[4] The spraying method according to any one of [1] to [3], wherein the water and the evaporation rate of the composition are 0.4 or more (c) the total amount of the alcohol is 5 with respect to the total amount of the composition. 〜50w/w%, the above evaporation rate is a relative value when the evaporation rate of butyl acetate is 1.

[5] The spraying method according to any one of [1] to [4] wherein the (b) antioxidant component is selected from the group consisting of ascorbic acid, sodium ascorbate, tocopherol, dibutylhydroxytoluene, butylhydroxyanisole and uncle At least one of the group consisting of butyl hydroquinone.

[Summary] The composition of the first aspect of the present invention is a composition for electrostatic spraying for spraying from the front end of the first electrode by applying a voltage between the first electrode and the second electrode of the electrostatic spray device by the voltage applying portion. The composition contains (a) an active ingredient and (b) an antioxidant component, and K represented by the following formula (1) satisfies 0.01 ≤ K ≤ 50, and in the following formula (1), the above composition is supplied to the above-mentioned The number of charges of one electrode is represented by the following formula (2). In the following formula (1), the number of charges supplied from the voltage applying portion to the second electrode is expressed by the following formula (3), which is a composition for electrostatic spraying. Matter: k = (number of charges supplied from the composition to the first electrode) / (number of charges supplied from the voltage applying portion to the second electrode)... Formula (1) Number of charges supplied from the composition to the first electrode = resistance The molar concentration of the oxidized component (mol/l) × the number of electrons supplied to the first electrode by the molecule of the antioxidant component × the amount of spray (l/s) × the Yafox 厥 constant (mol ^-1 )... Formula (2) The number of charges supplied to the second electrode by the voltage applying portion = current (C/ s) / metacharge (C)... equation (3).

According to the above configuration, even if the composition is sprayed for a long time by the electrostatic spray device, it is possible to provide an electrostatic spray device capable of suppressing formation of foreign matter derived from the first electrode and/or foreign matter derived from the component (b) in the first electrode. The composition used.

The (a) active ingredient contained in the composition of the aspect 2 of the present invention may be 0.1 to 30 w/w% based on the total amount of the composition.

According to the above configuration, the effect of the (a) active ingredient can be sufficiently exhibited, and the composition can be prevented from being separated by (a) the active ingredient.

The (b) antioxidant component contained in the composition of the aspect 3 of the present invention may be 0.0001 to 1 w/w% based on the total amount of the composition.

According to the above configuration, even if the composition is sprayed for a long time by the electrostatic spray device, it is possible to provide a composition capable of effectively suppressing formation of foreign matter derived from the first electrode and/or foreign matter derived from the component (b) in the first electrode. .

The composition of the form 4 of the present invention contains water and an evaporation rate of 0.4 or more. (c) The total amount of the alcohol is 5 to 50 w/w% with respect to the total amount of the composition, and the evaporation rate may be butyl acetate. The relative value of the evaporation rate is 1.

According to the above configuration, since the evaporation rate of the composition is high, the particles of the sprayed composition become smaller particles in the air more quickly, and as a result, the active ingredient diffuses more widely into the air. Therefore, the composition having the above configuration can suppress that the particle diameter does not become small after the spraying and the particles fall before being diffused.

In the composition of the form 5 of the present invention, the (b) antioxidant component may be selected from the group consisting of ascorbic acid, sodium ascorbate, tocopherol, dibutylhydroxytoluene, butylhydroxyanisole and t-butyl hydroquinone. At least one of the groups.

According to the above configuration, even if the composition is sprayed for a long time by the electrostatic spray device, it is possible to provide a composition capable of effectively suppressing formation of foreign matter derived from the first electrode and/or foreign matter derived from the component (b) in the first electrode. .

The electrostatic spray device of the sixth aspect of the present invention can spray the composition according to any one of the above aspects 1 to 5 above.

According to the above configuration, even if the composition is sprayed for a long period of time, it is possible to provide an electrostatic spray device capable of suppressing formation of foreign matter derived from the first electrode and/or foreign matter derived from the component (b) in the first electrode.

[Examples] [Research on Numerical Range of k] Referring to Figures 4 to 9, the preferred numerical range of k will be specifically described.

<About Ascorbic Acid> Fig. 4 is a view showing the mixing ratio of each component of the composition. Fig. 5 is an enlarged view of the front end of the spray electrode of the electrostatic spray device after the composition of Fig. 4 was sprayed for a long period of time.

As shown in Fig. 4, the compositions of Comparative Examples 1 and 2 and Examples 1 to 4 contained a peach flavor as (a) an active ingredient. Further, the compositions of Comparative Example 2 and Examples 1 to 4 contained ascorbic acid as (b) an antioxidant component.

In Fig. 5, various conditions for spraying the composition are as follows.・Temperature...25°C ・Spray amount...7.8×10 ^{- 8} (1/s), 3 days (total 20g) ・ Current...0.86×10 ^{- 6} (C/s). In addition, in Fig. 5, the front end of the spray electrode of the electrostatic spray device was observed using a microscope at 200 times.

According to Fig. 5, it has been confirmed that the composition of the long-term spray k = 0 (in other words, without (b) antioxidant component) or the composition of k = 0.005 (in other words, without the required amount of (b) antioxidant component) The electrostatic spray device has foreign matter attached to the front end of the spray electrode. Further, according to Fig. 5, it has been confirmed that no foreign matter adheres to the front end of the spray electrode of the electrostatic spray device after the long-term spray of the composition containing ascorbic acid ((b) antioxidant component) and k = 0.01 or more and 9.4 or less. These results confirmed that k is preferably 0.01 or more.

<Effect of (b) Antioxidant component in various environments> Fig. 6 is a view showing the mixing ratio of each component of the composition. Figure 7 is an enlarged view of the front end of the spray electrode of the electrostatic spray device after long-term spraying of the composition of Figure 6 under various conditions. As shown in Fig. 6, the compositions of Comparative Example 3 and Example 5 contained a floral fragrance as the (a) active ingredient. Further, the composition of Example 5 contains ascorbic acid as (b) an antioxidant component. In Fig. 7, various conditions for spraying the composition are as follows.・Temperature... as shown (15°C, 25°C or 35°C).・Humidity... as shown in the figure (35% RH (Relative Humidity), 55% RH or 75% RH).・Amount of spray...7.9×10 ^{- 8} (1/s), 3 days (total 20g) ・Current... 2.00×10 ^{- 6} (C/s). Further, in Fig. 7, the front end of the spray electrode of the electrostatic spray device was observed using a microscope at a magnification of 200 times.

According to Fig. 7, the following contents were confirmed: (1) Which environment is the condition 1 (15 ° C, 35% RH), Condition 2 (25 ° C, 55% RH), and Condition 3 (35 ° C, 75% RH) When the composition of Comparative Example 3 (k=0) is sprayed for a long period of time, foreign matter adheres to the front end of the spray electrode of the electrostatic spray device; (2) in any of the conditions of Condition 1, Condition 2, and Condition 3, long-term When the composition of Example 5 (k = 0.41) was sprayed, foreign matter adhered to the front end of the spray electrode of the electrostatic spray device was suppressed.

<About various (a) active ingredient and (b) antioxidant component> Fig. 8 is a view showing the mixing ratio of each component of the composition. Fig. 9 is a graph showing the results of evaluation of the influence of the composition on the Taylor cone when the composition shown in Fig. 8 was sprayed for a long period of time.

As shown in Fig. 8, the composition of Comparative Example 4 and Examples 6 to 18 contained a floral fragrance as (a) an active ingredient, and the compositions of Comparative Example 5 and Example 19 contained a marine type as (a) an active ingredient. spices. Further, the compositions of Examples 6 to 19 contain sodium ascorbate, dibutylhydroxytoluene (BHT), and butylhydroxyanisole (BHA) as (b) antioxidant components in the amounts described in the mixing ratio of Fig. 8 . , tert-butylhydroquinone (TBHQ) or D-alpha-tocopherol. In Fig. 9, various conditions for the spray composition are as follows.・Temperature...25°C ・Spray amount...7.7×10 ^{- 8} (1/s), 3 days (total 20g) ・Current... 2.00×10 ^{- 6} (C/s).

In addition, in Fig. 9, the influence of the composition on the Taylor cone was specifically evaluated as follows. After spraying 20 g of the composition shown in Fig. 8, the composition was sprayed again using an electrostatic spray device, and during the spraying, the front end of the spray electrode of the electrostatic spray device and the composition released from the front end were observed at 200 times using a microscope. Taylor cone. At this time, the evaluation was performed based on the following criteria. ○... No foreign matter adhered to the front end of the spray electrode, and a Taylor cone which was identical to the initial stage of the spray electrode (in other words, before the long-term spray composition) was formed. ×... A Taylor cone is formed different from the initial stage of the operation because foreign matter adheres to the front end of the spray electrode. Here, as the Taylor cone observed at the initial stage of the operation, a single jet generated by spraying only one of the tips of the spray electrode can be exemplified. On the other hand, as a specific example of the "Taylor cone different from the initial stage of operation", as shown in FIG. 16, a multi jet which is formed by spraying a plurality of points from the tip end of the spray electrode can be exemplified. Fig. 16 shows a composition (in other words, a Taylor cone formed) which is ejected from the front end portion of the spray electrode when the composition is sprayed with the spray electrode to which the foreign matter adheres at the tip end.

According to Fig. 9, regardless of whether k = 0, in other words, the (a) active ingredient contained in the composition containing no (b) antioxidant component, the following can be confirmed: (1) After spraying the composition for a long period of time, at the front end of the spray electrode Forming a foreign matter; and (2) after spraying the composition for a long period of time, the foreign matter forms a Taylor cone different from the initial stage of operation. Further, according to Fig. 9, regardless of the type and amount of the (a) active ingredient and (b) the antioxidant component contained in the composition having k of 0.01 ≤ k ≤ 50, the following can be confirmed: (1) long-term spray of the composition After the object, no foreign matter was formed at the front end of the spray electrode; and (2) after the composition was sprayed for a long period of time, the same Taylor cone as the initial stage of the operation of the spray electrode was formed. Further, since the composition of Example 7 contained 0.10 w/w% of the component (a), it was confirmed that the floral composition was filled with a space after the spray composition, and it was confirmed that the effect of the component (a) was sufficiently exerted. Further, in the composition of Example 8 containing 30.00 w/w% of an oily floral fragrance as the component (a), water containing 49.9945 w/w%, and (c) alcohol, regardless of the separation of the component (a) , (b) the precipitation of the components, and the separation of the composition, none of which was confirmed.

[About various (d) alcohols] Fig. 10 is a view showing the mixing ratio of each component of the composition. Fig. 11 is a graph showing the results of evaluation of the influence of the composition on the Taylor cone when the composition shown in Fig. 10 was sprayed for a long period of time.

As shown in Fig. 10, the compositions of Examples 20 to 22 contained a floral flavoring agent as (a) an active ingredient and sodium ascorbate as (b) an antioxidant component. Further, ethanol, isopropanol or 1-butanol as the component (d) is contained. In Fig. 11, various conditions for spraying the composition are as follows.・Temperature...25°C ・Spray amount...7.7×10 ^{- 8} (1/s), 3 days (total 20g) ・Current... 2.00×10 ^{- 6} (C/s). Further, in Fig. 11, the influence of the composition on the Taylor cone was the same as that of the evaluation method and evaluation criteria of the Taylor cone of Fig. 9.

According to Fig. 11, regardless of the type of (d) ethanol contained in the composition having k of 0.01 ≤ k ≤ 50, the following contents were confirmed: (1) after the composition was sprayed for a long period of time, no foreign matter was formed at the front end of the spray electrode; (2) After spraying the composition for a long period of time, the same Taylor cone as the initial stage of the operation of the spray electrode was formed.

Further, the inventors prepared a composition containing no water and (c) alcohol, and the composition was compared with the compositions of Examples 20 to 22, and the evaporation rate of the composition was evaluated. Specifically, a certain amount (0.2 ml) of the composition was placed in a petri dish, allowed to stand at room temperature for 30 minutes, and the weight of the composition before and after standing was measured. As a result, it was found that the composition without water and (c) alcohol evaporates by 0%, and the compositions of Examples 20 to 22 evaporate by 15%. From the above results, it was found that the composition containing water and (c) alcohol evaporated faster than the composition containing no water and (c) alcohol. Further, a composition containing no water and (c) alcohol was prepared, and the composition and the compositions of Examples 20 to 22 were not diffused into the air after being sprayed by the electrostatic spray device for oil-sensitive paper detection as shown in Fig. 14 . And the falling composition. As a result, compared with the compositions of Examples 20 to 22, it was clearly observed that the oil-sensitive paper had more black spots from the composition than the composition containing no water and (c) alcohol. From the above results, it was found that the composition containing water and (c) alcohol diffused more widely in the air than the composition containing no water and (c) alcohol.

[Additional Description of the Invention] The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention, and the embodiments obtained by appropriately combining the technical means disclosed in the respective embodiments are also included in the present invention. Within the technical scope.

In addition, all the academic documents and patent documents described in the present specification are incorporated herein by reference. In addition, unless otherwise specified in the specification, "A to B" indicating a numerical range means "A or more B or less".

1‧‧‧ spray electrode (first electrode)

2‧‧‧ reference electrode (second electrode)

3‧‧‧Power supply unit

5‧‧‧ front end

6‧‧‧ Spray electrode installation

7‧‧‧ reference electrode mounting

9‧‧‧ sloped surface

10‧‧‧ dielectric

11,12‧‧ openings

21‧‧‧Power supply

22‧‧‧High voltage generator (voltage application unit)

24‧‧‧Control circuit (control department)

25‧‧‧Feedback information (environmental information)

100‧‧‧Electrostatic spray device

221‧‧‧Oscillator

222‧‧‧Transformers

223‧‧‧ converter circuit

241‧‧‧Microprocessor

251‧‧‧ Temperature sensor

252‧‧‧ Humidity sensor

253‧‧‧ Pressure sensor

254‧‧‧Information on liquid contents

255‧‧‧Voltage/Current Sensor

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a functional block diagram showing the configuration of a main portion of an electrostatic spray device according to a first embodiment; Fig. 2 is a view for explaining the appearance of the electrostatic spray device of Fig. 1; Fig. 3 is a view for explaining a spray electrode and a reference electrode. Fig. 4 is a view showing a blending ratio of each component of the composition as a comparative example and an example of the second embodiment; Fig. 5 is an enlarged view of the front end of the spray electrode of the electrostatic spray device; Fig. 6 is a second embodiment; The comparative examples and the examples show the blending ratios of the components of the composition. FIG. 7 is an enlarged view of the front end of the spray electrode of the electrostatic spray device. FIG. 8 is a comparative example and an example of the second embodiment, showing the composition. FIG. 9 is a view showing the evaluation result of the influence of the composition on the Taylor cone when the composition shown in FIG. 8 is sprayed for a long time; FIG. 10 is an embodiment of the second embodiment. A graph showing the blending ratio of each component of the composition; Fig. 11 is a graph showing the evaluation results of the influence of the composition on the Taylor cone when the composition shown in Fig. 10 is sprayed for a long time; A schematic diagram of the cause of foreign matter occurring at the front end of an electrode; Fig. 13 is a view showing an example of iron oxide accumulated at the front end of the first electrode; and Fig. 14 is a view showing the use of the first electrode spray composition shown in Fig. 13 A diagram of a method for detecting a portion of a composition that does not diffuse into the air; FIG. 15 is a view showing the oil-sensitive paper obtained by the method shown in FIG. 14; and FIG. 16 is a spray using a foreign matter attached to the front end. When the electrode sprays the composition, it shows a composition which is ejected from the front end of the spray electrode.

Claims (6)

A composition for electrostatic spraying, which is a composition for electrostatic spraying sprayed from a front end of the first electrode by applying a voltage between a first electrode and a second electrode of the electrostatic spray device by a voltage applying portion, The composition contains (a) an active ingredient and (b) an antioxidant component, and K represented by the following formula (1) satisfies 0.01 ≤ K ≤ 50, and in the following formula (1), the above composition is supplied to the first electrode. The number of charges is represented by the following formula (2). In the following formula (1), the number of charges supplied from the voltage applying portion to the second electrode is represented by the following formula (3), and K = (provided by the composition to the first electrode) Number of charges) / (number of charges supplied from the voltage applying portion to the second electrode)... Formula (1) Number of charges supplied from the composition to the first electrode = molar concentration of antioxidant component (mol/l) × by anti- The number of electrons supplied to the first electrode by the molecule of the oxidized component × the amount of spray (l/s) × the concentration of the argon added enthalpy (mol ^-1 )... (2) The number of charges supplied from the voltage applying portion to the second electrode = Current (C/s) / metacharge (C)... Equation (3). The composition for electrostatic spraying according to claim 1, wherein the (a) active ingredient contained in the composition is 0.1 to 30 w/w% based on the total amount of the composition. The composition for electrostatic spraying according to the first or second aspect of the invention, wherein the (b) antioxidant component contained in the composition is 0.0001 to 1 w/w% based on the total amount of the composition. The composition for electrostatic spraying according to claim 1 or 2, wherein the composition includes water and an evaporation rate of 0.4 or more (c) the total amount of alcohol relative to the total amount of the composition. The ratio is from 5 to 50 w/w%, and the above evaporation rate is a relative value at which the evaporation rate of butyl acetate is 1. The composition for electrostatic spraying according to claim 1 or 2, wherein the (b) antioxidant component is selected from the group consisting of ascorbic acid, sodium ascorbate, tocopherol, dibutylhydroxytoluene, and butylhydroxyanisole. At least one of the group consisting of tert-butyl hydroquinone. An electrostatic spray device, which is a composition according to any one of claims 1 to 5.