JP2012191064A - Electronic component housing case for bulk feeder - Google Patents

Abstract

The present invention provides an electronic component storage case for a bulk feeder that is excellent in non-contaminating properties and has an excellent effect of suppressing electrical breakdown of electronic components to be stored.
A bulk case is a container for storing electronic components in a bulk state, and is made of a material subjected to antistatic treatment with a polymer antistatic agent. The bulk case 100 is a container for storing electronic components in a bulk state, and has a layer structure in which a plurality of layers are laminated from the inside of the container toward the outside, and at least one layer of the layer structure is And a material containing a polymer type antistatic agent.
[Selection] Figure 1

Description

  The present invention relates to an electronic component storage case for a bulk feeder.

  With the downsizing of electronic parts and the miniaturization of chips, especially in the form of cylindrical or prismatic chip-like electronic parts, a supply form in which these parts are housed in a bulk form is often used. And in the mounting apparatus which mounts a chip-shaped electronic component on a printed circuit board, the chip-shaped component supply apparatus which takes out and supplies the chip-shaped components accommodated in the case in a bulk form one by one from the case is used.

  The bulk case is made of a resin such as polyvinyl chloride or polystyrene resin except for a part thereof, and in particular, the container portion for accommodating the chip-like component is formed of a transparent polystyrene resin.

  As a bulk component supply apparatus that supplies chip-shaped electronic components accommodated in a case in a bulk shape, a device that supplies chip-shaped electronic components from a plurality of bulk cases is known.

  In the bulk case unit, for example, the bulk case moves up and down, the part discharge pipe and other members slide with the bulk case, and the chip-like parts in the case constantly collide and rub against each other. As a result, the bulk case and the chip-shaped electronic components inside it are charged, causing the components to be attracted to each other and the balls to float to the component discharge pipe. It may not be possible to supply to the position.

JP 2007-131735 A JP 2010-215256 A JP 2006-272841 A JP-A-1-163234 JP 2001-278985 A

  The present invention relates to a bulk case in which electronic components are stored, an antistatic property that effectively suppresses electric breakdown of the stored electronic components while having an excellent non-contaminating configuration, that is, an electronic device for a bulk feeder. The object is to provide a parts storage case.

According to the present invention, there is provided a bulk feeder electronic component storage case that is a container for storing electronic components in a bulk state and is made of a material that has been subjected to antistatic treatment with a polymer-type antistatic agent. .
In addition, according to the present invention, an electronic component for a bulk feeder, which is a container for storing electronic components in a bulk state, the storage unit storing the electronic components is made of a material containing a polymer antistatic agent. A component storage case is provided.

  According to the present invention, the electronic parts storage case for bulk feeder is antistatic treated with a polymer antistatic agent, so that the contents are excellent in non-contamination and effectively prevent electrical breakdown of electronic parts. can do.

According to the present invention, a container for storing electronic components in a bulk state has a layer structure in which a plurality of layers are stacked from the inside of the container toward the outside, and at least one layer of the layer structure includes: An electronic component storage case for a bulk feeder is provided, which is made of a material subjected to an antistatic treatment with a polymer antistatic agent.
In addition, according to the present invention, a container for storing electronic components in a bulk state has a layer structure in which a plurality of layers are laminated from the inside of the container toward the outside, and at least one layer of the layer structure. However, there is provided an electronic component storage case for a bulk feeder, which is made of a material containing a polymer type antistatic agent.

  According to the present invention, since the electronic component storage case for bulk feeder has a multilayer structure, and at least one of them is subjected to antistatic treatment, it is possible to suppress the electric breakdown of the electronic component stored in the container and Non-contamination can be further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic component storage case for bulk feeders which was excellent in the non-contamination property and was excellent in the electrical destruction suppression effect of the electronic component stored is provided.

It is a perspective view which shows the outline of a structure of the bulk case in this embodiment. It is AA 'sectional drawing of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and detailed description thereof is appropriately omitted so as not to overlap.

(First embodiment)
In this embodiment and the following embodiments, an electronic component storage case for bulk feeder (hereinafter also referred to as “bulk case”) is a container that stores electronic components in a bulk state. Although the shape of a bulk case can be selected according to the kind, shape, etc. of a bulk feeder, an example is shown in FIG. FIG. 1 is a perspective view showing an outline of the configuration of the bulk case in the present embodiment. FIG. 2A is a cross-sectional view taken along the line AA ′ of FIG.

  A bulk case 100 illustrated in FIG. 1 includes a box-shaped storage unit 101. A plurality of electronic components are stored in a bulk state inside the storage unit 101 which is a case body. The storage unit 101 is made of a material containing a polymer type antistatic agent. A case mounting portion 107 is provided at the end of the storage portion 101, and the bulk case 100 is mounted on the bulk cassette at the case mounting portion 107. The case mounting portion 107 is provided with an opening portion 105 communicating with the storage portion 101, and the opening portion 105 is opened and closed by sliding the slide portion 103 provided on the wall surface of the storage portion 101.

Examples of the material of the bulk case 100 include the following resins. These resins can be used alone or in combination of two or more kinds, and can also be used in combination with a predetermined antistatic agent.
Crystalline polyolefins such as polyethylene (PE), polypropylene (PP), poly-3-methyl-1-butene, poly-4-methyl-1-pentene;
Polyesters such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN);
Polycarbonate;
Acrylic resins such as polymethyl methacrylate (PMMA);
Styrenic resins such as polystyrene (PS) and acrylonitrile / butadiene / styrene resin (ABS); and ethylene / (meth) acrylic acid copolymers or ionomers thereof.

The bulk case 100 is made of a material that has been subjected to antistatic treatment. Specifically, the antistatic treatment is performed by blending an antistatic agent such as a polymer type antistatic agent into the material. As the polymer type antistatic agent, one containing metal or metal ion can be used. Specific examples of metal ions include potassium ions. Further, the antistatic treatment can be performed by the combined use of the high molecular antistatic agent and the low molecular antistatic agent.
The bulk case 100 can be obtained by molding a resin composition containing a polymer type antistatic agent, for example.

Next, the polymer type antistatic agent that can be used for the antistatic treatment in the present embodiment will be described with specific examples.
As the polymer type antistatic agent, for example, materials described in JP-A-2007-131735 are used. Specifically, an ionomer composition in which a part or all of the carboxyl groups of the ethylene / unsaturated carboxylic acid random copolymer is neutralized with an alkali metal can be used. The coalescence includes other unsaturated monomer components such as acrylic esters such as methyl (meth) acrylate, ethyl (meth) acrylate, isobutyl (meth) acrylate, n-butyl (meth) acrylate, An unsaturated ester such as methacrylic acid ester or vinyl acetate may be copolymerized.

  As the ethylene / unsaturated carboxylic acid random copolymer, the ethylene component is 60 to 90% by mass, particularly 70 to 88% by mass, the unsaturated carboxylic acid component is 10 to 40% by mass, particularly 12 to 30% by mass, and others. It is preferable that the unsaturated monomer component is copolymerized in a proportion of 0 to 30% by mass, particularly 0 to 20% by mass. Such a copolymer can be obtained by random copolymerizing each polymerization component under high temperature and high pressure. Moreover, as long as the total satisfies the above requirements, two or more types having different unsaturated carboxylic acid component units may be used.

  As the ion source of the ionomer, alkali metals, that is, lithium, sodium, potassium, rubidium, and cesium are used, and potassium is particularly preferable. Examples of the unsaturated carboxylic acid component in the ionomer include acrylic acid, methacrylic acid, fumaric acid, maleic acid monomethyl ester, maleic acid monoethyl ester, and maleic anhydride. The content of the alkali metal cation in the ionomer is in the range of 0.4 to 4 mol, preferably 0.6 to 2 mol, per kg of ionomer from the viewpoint of non-chargeability.

  It is also preferable to use an ionomer having a melt flow rate (MFR) at 190 ° C. and a load of 2160 g of 0.01 to 1000 g / 10 minutes, particularly 0.1 to 100 g / 10 minutes.

  The ionomer composition may further contain a surfactant. The surfactant is not particularly limited as long as it can be uniformly mixed or dispersed in the ionomer and can support the antistatic effect, and is not limited to a cationic surfactant, an anionic surfactant, Either an ionic surfactant or an amphoteric surfactant can be used. The blending amount of the surfactant is, for example, 0.1 parts by mass or more, preferably 1 part by mass or more per 100 parts by mass of the ionomer component from the viewpoint of improving the non-charging property. On the other hand, from the viewpoint of facilitating preparation of the blend, it is, for example, 30 parts by mass or less, preferably 20 parts by mass or less, per 100 parts by mass of the ionomer component.

  A composition containing an ionomer and a resin is prepared by melt mixing using a melt-kneading apparatus such as an extruder, and the bulk case 100 is obtained by molding the obtained resin composition. The bulk case 100 may be formed immediately after the resin composition is melt-mixed. Alternatively, the bulk case 100 may be pelletized after the melt-mixing and then molded by another melt-molding machine.

Another example of the material subjected to the antistatic treatment with the polymer antistatic agent is a styrene resin-containing composition containing a polymer compound obtained by potassium saponifying an ethylene / unsaturated carboxylic acid ester copolymer. For example, the materials described in WO2010 / 013817 may be used.
As the ethylene / unsaturated carboxylic acid ester copolymer, which is a material resin used for the polymer saponified product, ethylene and an alkyl ester of an unsaturated carboxylic acid, such as an alkyl ester of acrylic acid, an alkyl ester of methacrylic acid, an alkyl ester of ethacrylic acid, Examples of the copolymer include crotonic acid alkyl ester, fumaric acid alkyl ester, maleic acid alkyl ester, maleic acid monoalkyl ester, maleic anhydride alkyl ester, itaconic acid alkyl ester, and itaconic anhydride alkyl ester. .

Examples of the alkyl moiety of the alkyl ester include those having 1 to 12 carbon atoms, and more specifically, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, secondary butyl, 2-ethylhexyl, An alkyl group such as isooctyl can be exemplified.
As the unsaturated carboxylic acid ester, acrylic acid or methacrylic acid methyl ester, ethyl ester, normal butyl ester, and isobutyl ester are particularly preferable.

  Particularly preferred ethylene / unsaturated carboxylic acid ester copolymers are ethylene (meth) acrylic acid ester copolymers, especially ethylene / methyl acrylate copolymers, ethylene / ethyl acrylate copolymers, ethylene / acrylic acid. Normal butyl copolymer, ethylene / isobutyl acrylate copolymer, ethylene / methyl methacrylate copolymer, ethylene / ethyl methacrylate copolymer, ethylene / normal butyl copolymer, ethylene / methacrylic It is an acid isobutyl copolymer.

The content of the structural unit derived from the unsaturated carboxylic acid ester in the ethylene / unsaturated carboxylic acid ester copolymer before saponification is preferably 5 to 50% by mass, particularly preferably 20 to 35% by mass. That is, it is preferable that the content of the structural unit derived from the unsaturated carboxylic acid ester is in this range because the balance of antistatic properties, flexibility, and miscibility with other resins can be further improved.
The ethylene / unsaturated carboxylic acid ester copolymer before saponification (190 ° C., melt flow rate at 2160 g load (JIS K7210-1999)) is preferably in the range of 1 to 1300 g / 10 min.
The ethylene / unsaturated carboxylic acid ester copolymer before saponification may be used as a mixture of two or more.

  Such an ethylene / unsaturated carboxylic acid ester copolymer is produced, for example, by high-pressure radical copolymerization known per se.

  Saponify the ethylene / unsaturated carboxylic acid ester copolymer with alkali. Examples of the caustic alkali metal ion species used for saponification include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs). From the viewpoint of antistatic properties and antistatic properties, saponification with potassium is preferable.

In the polymer saponified product, the potassium ion concentration present in the saponified product as the carboxylic acid potassium salt is in the range of 0.1 to 5.8 mol / kg, more preferably 1 to 3 mol / kg.
When the potassium ion concentration is not less than the lower limit, a surface resistivity of about 1014 Ω / □ or less required for antistatic properties can be obtained. On the other hand, when the potassium ion concentration is not more than the upper limit, the melt viscosity becomes too high. There is no, and formability and workability are good.

  The polymer saponified product in the present invention has a melt flow rate of 0.01 to 100 g / 10 min, particularly 0.1 to 50 g at 230 ° C. and 10 kg load (conforming to JIS K7210-1999) in terms of moldability and workability. A thing of / 10 minutes is suitable.

In the present invention, among the saponified polymers, the carboxylic acid potassium salt after saponification with respect to the molar amount of all unsaturated carboxylic acid ester group units in the ethylene / unsaturated carboxylic acid ester copolymer to be potassium saponified. The ratio of the molar amount of potassium ions present as 0.1 to 0.6, that is, the saponification degree is in the range of 10 to 90%, preferably 20 to 80%, more preferably 30 to 70. % Is preferable from the viewpoint of antistatic properties and miscibility with other resins.
Incidentally, since the ester component in the polymer is partially converted into a potassium salt component by the saponification reaction with potassium, the saponified product is a copolymer containing ethylene units, unsaturated carboxylic acid ester units, and unsaturated carboxylic acid potassium salt units. It becomes a coalescence and does not contain a free carboxyl group unit.
Even when blended with polystyrene, the polymer potassium saponified product can impart antistatic properties without substantially impairing its physical properties such as impact resistance represented by IZOD impact strength.

  Potassium saponification of the ethylene / unsaturated carboxylic acid ester copolymer may be carried out by a method known per se with caustic alkali or the like. For example, the method of saponification of potassium is, for example, an ethylene / unsaturated carboxylic acid ester copolymer and a predetermined amount of caustic alkali such as potassium hydroxide in a kneading apparatus such as an extruder, kneader, Banbury mixer, etc. The mixture is melt-mixed at a temperature, or the ethylene / unsaturated carboxylic acid ester copolymer is melted and homogenized by the kneading apparatus, and then a predetermined amount of caustic alkali such as potassium hydroxide is added, thereby producing an ethylene / unsaturated carboxylic acid An example is a method in which an ester portion of an acid ester copolymer is reacted with caustic to obtain a saponified product.

  Other examples of the polymer antistatic agent used for the antistatic treatment include those described in JP2010-215256A or JP2006-272841.

JP 2010-215256 A discloses an antistatic agent made of a copolymer having a conductive unit and a non-conductive unit, having a hydrophilic segment as a conductive unit, and a non-conductive unit as A polymer-type antistatic agent comprising a polymer compound having a unit such as polyamide or polyolefin is described. More specifically, polyether ester amide copolymers described in JP-A-1-163234, polyolefin blocks described in JP-A-2001-278985, and hydrophilic polymer blocks Block copolymer having a structure in which the olefinic monomer is polymerized and a block copolymer having a structure in which the olefinic block in which the olefinic monomer is polymerized and the hydrophilic block in which the hydrophilic monomer is polymerized are alternately coupled. A polymer etc. are mentioned. More specifically, examples of the polymer-type antistatic agent include resins commercially available under the trade names Pelestat 230 and Pelestat NC3510 (manufactured by Sanyo Chemical Industries).
These polymer antistatic agents can also be used in combination with, for example, an ethylene / unsaturated ester copolymer component and low-density polyethylene.

Japanese Patent Application Laid-Open No. 2006-272841 discloses polyacrylate quaternary ammonium salts, polystyrene quaternary ammonium salts, polyether-ester-amides, and polyether-polyolefin block polymers as polymer antistatic agents. Is illustrated.
Among these, the polyether-ester-amide is exemplified by a polymer composed of three components of an ether group-containing component, an ester group-containing component, and an amide group-containing component. For example, polyether ester amide containing a polyethylene oxide component and a nylon 12 component can be mentioned. More specifically, polyethylene oxide portion _{-H- [O-CH 2 CH 2} ] n -O-, adipic acid unit -OC (CH _{2) 4} CO- and nylon 12 parts _{- [NH (CH 2) 11} CO ] The copolymer comprised from 3 parts of _n- O- is mentioned. For example, product names “IRGASTAT P 18” and “IRGASTAT P 22” (both manufactured by Ciba Specialty Chemicals) can be mentioned.
Moreover, as a polyether-polyolefin block polymer, the thing as described in Unexamined-Japanese-Patent No. 2001-278985 is mentioned.

Next, the effect of this embodiment is demonstrated.
The bulk case 100 of the present embodiment is made of a material that has been subjected to antistatic treatment with a polymer-type antistatic agent. It is also possible to effectively suppress contamination of electronic components.

In addition, as a material of the bulk case 100, a powdery, flaky, or fibrous metal or metal compound may be blended with the above-described resin as necessary to impart conductivity. In the present embodiment, since the polymer type antistatic agent is blended in the material of the storage unit 101, the dispersion of the metal or metal compound in the resin material can be improved.
At this time, a low molecular weight antistatic agent such as a surfactant may be additionally used. By blending the low molecular weight antistatic agent, the dispersion of the metal or metal compound in the resin material is further improved.

(Second embodiment)
In the present embodiment, the description will be focused on differences from the first embodiment.
The basic configuration of the bulk case in this embodiment is the same as that of the bulk case 100 (FIG. 1) described in the first embodiment, but is a container having a layer structure of at least two layers of an outer layer and an inner layer. Different. At least one layer of the layer structure is made of a material subjected to antistatic treatment. The number of layers may be two or three, or four or more layers.

FIG. 2B is a cross-sectional view taken along the line AA ′ of FIG. In the present embodiment, for example, as shown in FIG. 2B, the storage unit 101 includes an inner layer 111 and an outer layer 113, and the outer layer 113 is made of a material containing a polymer antistatic agent. Further, the inner layer 111 is not subjected to antistatic treatment. There is no restriction | limiting in particular in the material of the inner layer 111, For example, resin illustrated in 1st embodiment can be used. As the inner layer 111, it is preferable to use a material that is non-contaminating to the electronic components in the storage unit 101.
Although not shown in the figure, the storage portion 101 is composed of three or more layers, both outer layers are composed of a material that has not been subjected to antistatic treatment, and the intermediate layer is composed of a material containing a polymeric antistatic agent. It does not matter.

  Also in this embodiment, since the outer layer 113 of the storage part 101 is comprised with the material containing a polymer type antistatic agent, the effect similar to 1st embodiment is acquired. In the present embodiment, the innermost layer (inner layer 111) with which the electronic component is in contact is not subjected to antistatic treatment. For this reason, the innermost layer (inner layer 111) also has a more remarkable non-electric breakdown property and non-contamination property with respect to the electronic component as compared with the polymer layer antistatic agent subjected to the antistatic treatment.

  It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

Next, examples of the present invention will be described.
In the following examples and comparative examples, the following raw materials were used.
PS: Polystyrene (PS Japan, H8765, MFR = 5.9 g / 10 min (200 ° C.))
PP: Polypropylene (Prime Polymer Co., Ltd. J104, Homo PP, MFR = 8 g / 10 min (230 ° C.))
ABS: Acrylonitrile-butadiene-styrene copolymer (TECHNO ABS330, MFR = 42 g / 10 min (220 ° C.) manufactured by Technopolymer Co., Ltd.)
Antistatic agent 1: Mixture of potassium ionomer (polymeric antistatic agent) 90% by mass of ethylene / (meth) acrylic acid copolymer and 10% by mass of polyhydric alcohol compound Antistatic agent 2: Ethylene / ethyl acrylate Copolymer saponification product (polymer type antistatic agent)
Antistatic agent 3: Potassium ionomer of ethylene / (meth) acrylic acid copolymer (polymer type antistatic agent)
Antistatic agent 4: Pelestat NC6321, manufactured by Sanyo Chemical Industries, Ltd., MFR = 20 g / 10 min (190 ° C.) (polymer type antistatic agent)
Antistatic agent 5: stearic acid monoglyceride (low molecular weight antistatic agent)

(Examples 1-7, Comparative Examples 1-3)
The raw materials shown in Table 1 were melted and mixed according to the formulation shown in the table, and a square plate having a thickness of 2 mm was obtained by injection molding.
The square plate obtained in each example was evaluated by the following method.
(Non-charging test)
The sample (square plate) was left to stand at 23 ° C. and 50% relative humidity for 7 days, and immediately after reciprocating 20 times with rubbing and rubbing, it was brought close to a non-adherent body (joint joint) and the adhesion state was evaluated. The evaluation criteria are as follows.
○: No contact with bonito even when contacted △: Slightly attached with bonito when in contact ×: Adhesion when approaching 5 cm away from non-adherent body (non-contamination test)
The sample (square plate) was allowed to stand for 72 hours at 60 ° C. and 90% relative humidity, and the surface stickiness was evaluated. Three samples for each example or comparative example were tested and evaluated according to the following criteria.
○: No stickiness ×: Stickiness

  From Table 1, all the base materials described in Examples 1 to 7 are excellent in non-charging property and non-contamination property, and can be suitably used as a bulk case material.

DESCRIPTION OF SYMBOLS 100 Bulk case 101 Storage part 103 Slide part 105 Opening part 107 Case mounting part 111 Inner layer 113 Outer layer

Claims (6)

  An electronic component storage case for a bulk feeder, which is a container for storing electronic components in a bulk state, and is made of a material subjected to an antistatic treatment with a polymer antistatic agent. A container for storing electronic components in a bulk state,
Having a layered structure in which a plurality of layers are laminated from the inside of the container toward the outside;
An electronic component storage case for a bulk feeder, wherein at least one layer of the layer structure is made of a material containing a polymer type antistatic agent.   3. An electronic component storage case for a bulk feeder according to claim 1 or 2, wherein the antistatic treatment is performed by the combined use of the high molecular weight antistatic agent and the low molecular weight antistatic agent. Parts storage case.   An electronic component storage case for a bulk feeder, which is a container for storing electronic components in a bulk state, wherein a storage portion for storing the electronic components is made of a material containing a polymer-type antistatic agent.   The electronic component storage case for bulk feeders of any one of Claims 1 thru | or 4 WHEREIN: The said polymer type antistatic agent contains the metal or metal ion, The electronic component storage case for bulk feeders.   The electronic component storage case for bulk feeders according to claim 5, wherein the metal ions are potassium ions.

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