JP2007160198A - Thinner regenerant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thinner regenerant which requires no treatment for removing a resin removal agent from thinner or dehydrating treatment after regeneration treatment of used thinner, and with which efficient and simple treatment is made possible, and which can be repeatedly used several times. <P>SOLUTION: This thinner regenerant is formed by mixing at least one of talc and filling powder; at least one of acid clay and synthetic zeolite; and at least one of aluminum sulfate and potassium alum. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a regenerant for regenerating used thinner that occurs after the paint has been treated with cleaning thinner in the industry where pigments are used.

  In the automobile body maintenance industry and the like, after the painting process is completed, a spray gun, a cup, or the like to which the paint has adhered is cleaned using a cleaning thinner, so that a large amount of used thinner is generated as waste liquid. In recent years, from the viewpoint of reducing volatile organic compounds (VOC), it is important to recycle used thinner.

In view of the current situation, various methods for regenerating used thinner have been reported, but most of them are practically used in distillation. This situation is also the same in the automobile body maintenance industry, and it is the mainstream to use a distillation regenerator of about 10L.
However, since the distillation type regenerator is expensive, in the automobile body maintenance industry in which the majority of small-scale contractors occupy, there are almost no contractors who have introduced the apparatus. In addition, since the apparatus consumes a large amount of electricity, there is a problem that the burden of electricity is heavy.
Therefore, a trader who does not own the device must have a processing trader collect it for a fee. However, the cost for the pick-up is more than 2000 yen per 16L can depending on the region, which is a big burden.

  On the other hand, in Patent Documents 1 and 2 below, a method for separating a thinner by adding an inorganic compound exhibiting condensability to a paint is shown. In addition, a resin remover is used in combination to remove a resin component. It has also been shown to do. Examples of the resin removing agent include alkali metal hydroxides, alkali metal alkoxide compounds, alcohol solvents, and the like.

  However, according to this method, there is a possibility that the resin remover may be produced as a dissolved substance in the original composition of the thinner, which may cause a change or alteration of the thinner. Therefore, a method for taking out the resin remover from the thinner is required separately. Further, when a relatively large amount of water is mixed in the treated thinner, a separate dehydration step is also required.

JP 2001-179006 A JP 2002-45611 A

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide the following thinner regenerating agent. First, it is assumed that the used thinner can be reprocessed extremely efficiently and easily without the need to separately perform a treatment for removing the resin remover from the thinner or a dehydration treatment after the treatment. In addition, the thinner regenerator used once can be reused and the effect can be sustained and promoted.
Furthermore, it shall be excellent also in the selectivity of a material and a mixing ratio. In addition, the use of a safe and inexpensive material facilitates practical application and reduces the environmental impact. In addition, it is effective for all industries that use pigments.

  The invention according to claim 1 is a thinner regenerating agent characterized by mixing at least one of talc and powder, at least one of acid clay and synthetic zeolite, and at least one of sulfuric acid band and potassium alum. About.

  The invention according to claim 2 relates to the thinner regenerator according to claim 1, characterized in that at least talc, acid clay, and a sulfuric acid band are mixed.

  The invention according to claim 3 is composed of talc, acid clay, and sulfuric acid band. The blending ratio of each component in the entire regenerant is 10 to 90% by volume of talc, 5 to 45% by volume of acid clay, and 5 to 45% of sulfuric acid band. The thinner regenerating agent according to claim 2, wherein the thinner regenerating agent is vol%.

  The invention according to claim 4 is characterized in that the blending ratio is talc 50 to 70% by volume, acid clay 20 to 30% by volume, and sulfuric acid band 10 to 20% by volume. About.

According to the invention according to claim 1, by mixing at least one of talc and at least one of acid clay, at least one of synthetic zeolite, and at least one of sulfuric acid band and potassium alum, Since the thinner regenerating agent adsorbs the paint components and precipitates at the lower part, the upper thinner can be easily recovered and the thinner can be efficiently regenerated.
Moreover, since the talc and powder adsorbs and precipitates the resin, there is no need to separately remove the resin remover. Furthermore, since acid clay and synthetic zeolite adsorb moisture, it is not necessary to perform a separate dehydration treatment.
Further, by removing the regenerated thinner after the thinner regenerating process, it can be used as a thinner regenerating agent a plurality of times, and further, the regenerating process can be performed in a shorter time than the first time. In addition, by adding a small amount of thinner regenerating agent to the thinner regenerating agent that has been used a plurality of times, the regenerating effect can be maintained and further the thinner regenerating effect can be promoted. Therefore, cost reduction can be realized and the influence on the environment can be reduced.
Further, the constituent material of the thinner regenerating agent and the ratio thereof can be selected depending on the price of the material. Furthermore, since these substances are safe and inexpensive, they can be put into practical use more easily and have less impact on the environment. In addition, since it is effective not only for cleaning thinner but also for regeneration of organic solvent for cleaning, it can be effective for all industries using pigments such as paint and ink. Even if it contains a curing agent, it can be fully regenerated.

According to the second aspect of the invention, thinner can be efficiently regenerated in a shorter time by mixing at least talc, acid clay, and sulfuric acid band into a thinner regenerator.
According to the invention which concerns on Claim 3, there exists a higher effect by making the mixing ratio of a thinner regenerator into 10-90 volume% of talc, 5-45 volume% of acid clay, and 5-45 volume% of sulfuric acid bands. be able to.
According to the invention of claim 4, the mixing ratio of the thinner regenerator is 50 to 70% by volume of talc, 20 to 30% by volume of acid clay, and 10 to 20% by volume of sulfuric acid band, so that the transparency can be further reduced in a shorter time. High reproduction thinner.

Hereinafter, preferred embodiments of the thinner regenerating agent according to the present invention will be described.
The thinner regenerating agent according to the present invention is suitably used mainly for recycling the cleaning thinner used for removing the paint adhering to the spray gun, the cup and the like in the automobile body maintenance industry.
Examples of the paint to be used include acrylic lacquer paint, acrylic enamel paint, and melanin paint. The thinner regenerator according to the present invention can also be used to regenerate cleaning organic solvents, and is effective for paints and ink pigments other than the exemplified paints. Accordingly, the present invention can be used in industries other than the automobile body maintenance industry that use pigments.

The thinner regenerator according to the present invention is a thinner regenerator in which at least one of talc and powder, at least one of acid clay and synthetic zeolite, and at least one of sulfuric acid band and potassium alum are mixed. Of the thinner regenerators according to the present invention, combinations of those composed of three kinds of substances are shown in the following (a) to (ku).
(A) Talc, acid clay, powder with sulfuric acid band (I), synthetic zeolite, potash alum (U) Talc, acid clay, powder with potash alum (d), synthetic zeolite, sulfate band (O) Talc, synthesis Zeolite, Sulfuric Acid Band (F) Powder, Acid White Clay, Potash Alum (G) Talc, Synthetic Zeolite, Potassium Alum (F) Powder, Acid Clay, Sulfuric Band The most efficient combination of (A) Examples include talc, acid clay, and sulfuric acid band. Further, the thinner regenerating agent according to the present invention is not limited to a mixture of three types, for example, a mixture of six types of powders such as talc, acid clay, sulfuric acid band, synthetic zeolite, and potassium alum. Other combinations may be used.
These substances are as follows.
Talc ・ ・ ・ Mg3Si4O10 (OH) 2 as the main component Acid clay ・ ・ ・ ・ SiO2xAl2O3nH2O as the main component Sulfuric acid band ・ ・ ・ Powder with Al2 (SO4) 3 as the main component ・··········· powdered ocher · A group of synthetic zeolite · aluminosilicate · · · · · · · · · KAl (SO4) 212H2O as the main component

Talc adsorbs the pigment / resin component and becomes the main component of the thinner regenerating agent of the present invention. Since not only the pigment but also the resin component is adsorbed and precipitated, it is not necessary to separately remove the resin remover.
The acid clay has an effect as an auxiliary agent that promotes adsorption of talc and a dehydrating effect. Since it has a dehydrating effect, the collected thinner does not contain moisture and does not require a separate dehydration treatment.
The sulfuric acid band has the effect of condensing and precipitating the pigment / resin component adsorbed by talc and acid clay.
In addition, the same effect as talc, acid clay, and sulfuric acid band can be obtained with powdered powder, synthetic zeolite, and potassium alum.

However, these substances have no effect even if they are used alone as a used thinner (hereinafter referred to as waste liquid). However, when various substances are tested, when 50% by volume of talc and acid clay are mixed and put into the waste liquid, the upper part of the colored thinner is somewhat discolored. And although the boundary is not clear, it becomes three layers from the upper part, the layer that has been slightly decolored, the layer that has not changed from the original waste liquid, and the layer in which talc and acid clay are precipitated.
When aluminum sulfate is added to the three-layered waste liquid and stirred, a transparent layer appears with the passage of time, and the number of transparent portions gradually increases. The three types of substances adsorb pigments and resin components and settle to the bottom, resulting in a two-layered state where the upper part is a regenerated thinner that is transparent. Thus, the effect of a thinner regenerating agent can be obtained by mixing those that cannot be expected alone.

When three types of talc, acid clay, and sulfuric acid band are used as the thinner regenerating agent, the mixing ratio is 10 to 90% by volume of talc, 5 to 45% by volume of acid clay, and 5 to 45% by volume of sulfuric acid band, and more preferably, It is good to set it as 50-70 volume% of talc, 20-30 volume% of acid clay, and 20-30 volume% of sulfuric acid bands. Among them, 60% by volume of talc, 25% by volume of acid clay, and 15% by volume of sulfuric acid band are cited as optimum values.
When the talc is less than 10% by volume, the pigment or resin cannot be sufficiently adsorbed. On the other hand, when the acid clay is less than 5%, water cannot be removed sufficiently, or the effect of talc is not sufficiently promoted. If the sulfuric acid band is less than 5% by volume, the effect of coagulation precipitation cannot be obtained sufficiently, making it difficult to recover the thinner. As described above, those having a mixing ratio outside the range of 10 to 90% by volume of talc, 5 to 45% by volume of acid clay, and 5 to 45% by volume of sulfuric acid band are not preferable.

Hereinafter, a specific regenerating method will be described using a thinner regenerating agent comprising talc, acid clay, and sulfuric acid band.
First, the three types of powder are stirred and mixed thoroughly. At this time, the effect may be halved if not sufficiently mixed.
About 20 to 40% by volume of a thinner regenerator is added to the waste liquid 100 in the container and stirred. Let the powder completely contain thinner for several hours.
By leaving it alone, the thinner regenerator incorporating the pigment and the resin component is precipitated, and the transparent thinner appears as a supernatant in the upper portion, so that it can be recovered as a regenerated thinner.

After collecting the recycled thinner, if another waste liquid is added, the thinner can be regenerated at the same speed as the first time or faster. Thus, the thinner regenerating agent of the present invention can be used multiple times.
This is thought to be because the pigment / resin component adsorbed on the thinner regenerator first has the property of promoting adsorption when the waste liquid is added and stirred.

  Further, by adding a small amount of thinner regenerating agent to the thinner regenerating agent used a plurality of times, the effect can be maintained and promoted.

  In addition, talc is used as a food additive, and acid clay and sulfuric acid band are used for water treatment. These substances are known to be inexpensive substances without affecting the human body. In view of the above, it can be said that the thinner regenerating agent of the present invention is extremely safe and inexpensive and is also an environmentally friendly recycling agent.

  In addition, the present invention has a particularly remarkable effect on a waste liquid containing only one type of paint. Therefore, it works very efficiently on a cleaning thinner used in a paint manufacturing plant or the like. In addition, it is effective not only for paint cleaning thinners but also for organic solvents used for cleaning plates during printing. For this reason, it is considered to have an effect on all industries that use pigments such as paints and inks.

This regeneration method may be a thinner regenerating agent using three or more kinds of substances by mixing talc, acid clay, sulfuric acid band with powder, synthetic zeolite, and potassium alum. Moreover, although talc, acid clay, and a sulfuric acid band were illustrated as the most efficient combination, other combinations are naturally included in the present invention.
As described above, according to the present invention, the material and the blending ratio can be appropriately changed depending on the price of the material.

  Hereinafter, the effect of the present invention will be clarified by showing examples of the thinner regenerating agent according to the present invention. However, the present invention is not limited to the following examples.

1. Test for Confirmation of Regeneration Status with Components of Thinner Regenerant Firstly, the following Experiments 1 to 4 were performed in order to confirm the regeneration status of thinner by the difference in the components of the thinner regenerant.

<Experiment 1>
1. Thinner regenerants (1), (b) and (c) in Table 1 below were prepared as talc, acid clay, and sulfuric acid bands, respectively.

2. The following three types of waste liquid (used thinner) containing the waste liquid paint were prepared.
(A) 10L of lacquer thinner mixed with 150 mL of Ureta 88 black and (b) 150 mL of Ureta 88 metallic base mixed and stirred with 10L of lacquer thinner (c) Car body maintenance factory Waste liquid 10L
In addition, the said lacquer thinner uses 3000 thinner made by Wadashin Chemical Industry Co., Ltd., and the component display describes "toluene 50-60%, methanol 10-20%, isobutyl acetate 10-20%". The urethane 88 is a two-component urethane paint made of Isamu paint.
In addition, regarding the waste liquid of (c), the components of the thinner and paint are unknown, and it seems that various paints, curing agents, clears, and other solvents such as toluene and xylene are mixed therein.
3. Experimental Method For the three types of waste liquids (a) to (c) above, 2.5 L of the thinner regenerator confused at a blending ratio of 1 to 7 was mixed and stirred to confirm the regeneration status.

4). Experimental results The results of Experiment 1 are shown in Table 2 below. Table 2 shows the transparency after reproduction and the time required for reproduction. In this experiment, evaluation criteria A to D are defined for the transparency, and each state is as follows.
A: Completely transparent and almost the same as the original thinner.
B: It is transparent, and a little color remains when exposed to light, but it is hardly understood.
C: Transparent and a little color remains.
D: A transparent layer is formed on the upper surface about 2-3 cm.
Of course, the upper surface of B, C and D can be sufficiently used as a cleaning thinner.
As shown in Table 2, formulation no. The effect was confirmed in all thinner regenerating agents including 1 and 7.

From Experiment 1, it was confirmed that by mixing talc, acid clay, and sulfuric acid band, which could not be expected to be regenerated by one type, the effect was obtained regardless of the blending ratio. Among them, the formulation No. It was found that the effects of 3 to 5 regenerants were the highest.
Regarding the waste liquids (a) and (b), since there is only one type of paint dissolved in the thinner, a very clear effect was obtained. In particular, formulation No. As for No. 4, the surface gradually became transparent immediately after mixing with the waste liquid and stirring, and the effect appeared in a short time. Therefore, it can be said that the cleaning thinner used in a paint manufacturing plant or the like works extremely efficiently.
After that, the same experiment was conducted with 10% of the curing agent added to the paint, but the same effect was obtained, and the same effect was confirmed in the waste liquid after washing the paint and the curing agent. .
Regarding the waste liquid (c), the type and composition of the thinner / paint were not clear, and the color component remained faintly as the years passed by about 2 years. When this color was analyzed, it was found that oil and fat components were slightly mixed in the thinner. In such a case, the remaining components can be removed by introducing into the regenerated thinner a substance that can adsorb oil and fat components and does not dissolve in a solvent such as thinner, such as activated carbon.

<Experiment 2>
1. In Table 1, (b), (b), and (c) in the thinner regenerant experiment 1, a mixture of powder 20 with talc 100 by volume ratio, and synthetic zeolite 20 with acid clay 100. A thinner regenerator was prepared as a mixture, a mixture of potassium sulfate 100 with sulfuric acid band 100.
2. The same waste liquids (a) to (c) as in the waste liquid experiment 1 were used.
3. Experimental Method As in Experiment 1, the reproduction status was confirmed.
4). Experimental Results The transparency after regeneration and the time required for regeneration were confirmed in the same manner as in Experiment 1 (Table 2). Table 3 below shows the results of Experiment 2. As shown in Table 3, the result of Experiment 2 was almost the same as that of Experiment 1, although there were some differences.

  From Experiment 2, it was found that almost the same effect can be obtained by mixing other substances with the combination of talc, acid clay and sulfuric acid band. Therefore, it can be mixed as appropriate depending on the price of the material, and becomes an inexpensive thinner regenerator.

<Experiment 3>
A thinner regenerating agent was prepared by combining (i) to (c) of Table 1 in Experiment 1 with the combinations (i) to (vii) below, and the same experiment was performed on the waste liquids (a) to (c). It was.
(I) Powder with (a) (b) Synthetic zeolite (c) Potash alum (ii) (I) Talc (b) Acid clay (c) Potato alum (iii) Powder with (b) (b) Synthetic zeolite (C) Sulfuric acid band (iv) (i) Talc (b) Synthetic zeolite (c) Sulfuric acid band (v) Powder with (a) (b) Acid clay (c) Potash alum (vi) (i) Talc (b) ) Synthetic zeolite (c) Potash alum (vii) Powder from (a) (b) Acid clay (c) Sulfuric acid bands (i) to (vii) In all combinations, although there is a difference in time and transparency In addition, a result of transparency D or higher was obtained.

  From Experiment 3, it was found that a sufficient effect could be obtained without using a combination of talc, acid clay and sulfuric acid band. Therefore, it can be said that the selection range of the material is widened, and the composition of the thinner regenerating agent can be appropriately changed depending on the price.

<Experiment 4>
For the waste liquid (c), the formulation No. 1 in Experiment 1 was used. Transparency and regeneration time were confirmed by adding 5 L twice as much as Experiment 1 to 4 thinner regeneration agents. As a result, the transparency became B in 6 hours.

  From Experiment 4, it can be said that by increasing the amount of the thinner regenerating agent, the time can be shortened and the same effect can be obtained.

2. Test for confirming the effect when the thinner regenerant is reused Next, Experiments 5 and 6 were conducted in order to confirm the effect of the reuse of the regenerant.

<Experiment 5>
1. Formulation No. used in thinner regenerant experiment 1 Four thinner regenerating agents were prepared.
2. The waste liquid (a) used in the waste liquid experiment 1 was used.
3. Experimental Method The waste liquid (a) was treated with a thinner regenerator, and the regenerated thinner was removed.
4). Experimental result A result of transparency A was obtained in 3.5 hours. Furthermore, a third use was possible.
Further, the same experiment was performed on the waste liquid (c), but almost the same result was obtained.

<Experiment 6>
As shown in Experiment 5, formulation no. The waste liquid (a) was regenerated three times with the thinner regenerating agent of No. 4, and newly added 200 ml of the thinner regenerator No. 4 was added, and the waste liquid (a) was added and stirred. As a result, the transparency became A in 4 hours.

Experiment 5 revealed that the thinner regenerating agent of the present invention can be used multiple times. This effect is thought to continue until the adsorbed component of the thinner regenerant becomes saturated. Furthermore, it turned out that the effect more than the first time is acquired after the 2nd time.
In addition, from Experiment 6, it was found that the effect can be sustained and promoted by adding a small amount of thinner regenerating agent to the thinner regenerating agent used multiple times.

INDUSTRIAL APPLICABILITY The present invention can be suitably used to regenerate thinner mixed with paint / pigment not only in the automobile body maintenance industry but also in every industry using paint / pigment. In addition, it can be used to regenerate organic solvents.
In particular, considering the recent rise in crude oil, the effect of the present invention is considered to be enormous.

Claims (4)

  A thinner regenerator comprising at least one of talc powder, at least one of acid clay, synthetic zeolite, and at least one of sulfuric acid band and potassium alum.   The thinner regenerator according to claim 1, wherein at least talc, acid clay, and a sulfuric acid band are mixed.   It consists of talc, acid clay, and sulfuric acid band, and the blending ratio of each component in the total regenerant is 10 to 90% by volume of talc, 5 to 45% by volume of acid clay, and 5 to 45% by volume of sulfuric acid band. The thinner regenerating agent according to claim 2. The thinner regenerator according to claim 3, wherein the blending ratio is talc 50 to 70 vol%, acidic clay 20 to 30 vol%, and sulfuric acid band 10 to 20 vol%.