KR20110116785A - Anti-static resin foam, preparation method thereof and packaging box using the same - Google Patents

Abstract

The present invention relates to an antistatic resin foam, a method for manufacturing the same, and an antistatic packaging box using the same, more specifically, a single or a mixture thereof and a thermoplastic resin selected from the group consisting of a conductive polymer, an ionic liquid, and carbon nanotubes. An antistatic resin foam coated with an antistatic composition, a method for preparing the same and an antistatic packaging box using the same.
The resin foam is excellent in antistatic performance and transparent to implement a variety of colors in the product, it can provide a packaging box that can be used for the storage and transport of glass, electronic components and foodstuffs.

Description

Anti-static resin foam, preparation method thereof and packaging box using same

The present invention relates to an antistatic resin foam, a method for manufacturing the same, and an antistatic packaging box using the same, and more particularly, to an antistatic resin foam having excellent antistatic property and impact relieving property, a manufacturing method thereof, and an antistatic packaging box using the same.

Conventionally, resins such as EPS, EPP, EPE, etc. are used as packaging boxes for packaging and transporting display panels and glasses. Such resins have a property of accumulating static electricity generated by friction with other materials for a long time, so that foreign matters such as dust caused by static electricity flow into the product, thereby increasing the defect rate in the process. As a method of minimizing the defect rate in the process, there is a technique for imparting antistatic performance using a surfactant, a metal oxide and carbon black. However, when carbon black or metal oxide is used, surface resistance (10 ⁵ Ω / sq.) Is excellent, but it has disadvantages such as dust generation. When surfactant is used, transparency is ensured, but migration is severe, It is sensitive to changes in temperature and humidity and has a disadvantage of increasing surface resistance (10E9Ω / sq. Or more). Particularly, in the case of carbon black, dust generation is severe, causing work inconvenience, and due to the inherent color of carbon black, there is a limitation in manufacturing packaging boxes of various colors. In addition, in the past, light packaging using foams such as EPS (Expandable Polystyrene) was preferred for the protection of contents and convenience of handling.However, physical fragility (breaking, repeated cushioning), dust generation, and recycling of EPS packaging boxes were preferred. Impossible, there is a problem such as emission of harmful gases during incineration.

An object of the present invention to solve the above problems is to provide an antistatic resin foam excellent in the antistatic material is uniformly distributed to provide excellent antistatic properties, and excellent adhesion between the resin foam during molding.

Another object of the present invention is to provide a method for producing the antistatic resin foam.

Still another object of the present invention is to provide an antistatic packaging box molded using the antistatic resin foam.

The present invention to achieve the above object,

Single or a mixture thereof selected from the group consisting of conductive polymers, ionic liquids and carbon nanotubes; And it provides an antistatic resin foam coated with an antistatic composition comprising a thermoplastic resin.

The antistatic composition is

1 to 40% by weight alone or a mixture thereof selected from the group consisting of conductive polymers, ionic liquids and carbon nanotubes;

0.05 to 5 wt% thermoplastic resin;

0.05-5% by weight of dispersant; And

It may comprise a residual amount of solvent.

The conductive polymer may be a single or a mixture thereof selected from the group consisting of polyaniline, polypyrrole, polythiophene, poly (3,4-ethylenethiophene), derivatives and copolymers thereof.

In the ionic liquid, the cation is ammonium, phosphonium, pyridinium, imidazolium, benzimidazolium, pyrazolium, benzpyrazolium, indazolium, thiazolium, benzthiazolium, oxazolium, benzoxazolium, isothia Zolium, guanidinium, quinuclidinium, triazium, tetrazolium, quinolinium, isoquinolinium, piperidinium, pyrrolidinium, morpholinium, pyridazinium, pyrazinium, piperazinium, tri It may be selected from the group consisting of azinium, azepineium, and diazepineium.

The anion in the ionic liquid may be selected from the group consisting of MA _m ⁻ , alkylsulfonyl, haloalkylsulfonyl, phosphoryl, methide, imide and carbonyl group,

M is an element of group VIII, IB, 2B, IIIA or VA on a periodic table (CAS version), A is a halide, and m may be an integer of 2 to 15.

The ionic liquid can be selected from:

(R, R ', R "is independently hydrogen, alkyl or aryl group of C ₁ ~C _15,

And n is an integer from 2 to 15 in, wherein the - (CH-CH _{2) n}

X ⁻ is MA _m ⁻ , alkylsulfonyl, haloalkylsulfonyl, phosphoryl, metide, imide or carbonyl group, wherein M is an element of group VIII, IB, 2B, IIIA or VA on the periodic version (CAS version) , A is a halide and m is an integer from 2 to 15.)

The carbon nanotubes may have a diameter of 1 to 100 nm and a length of 1 to 500 μm.

The thermoplastic resin is polyurethane (TPU), polyvinyl chloride (PVC), polyvinyl alcohol, polyvinyl acetal, polyvinyl butadiene, polyolefin of polyvinylpyrrolidinone and polyolefin of polyethylene, polyvinyl, ABS, It may be a single or a mixture thereof selected from the group consisting of SBS, polycarbonate, polystyrene-based, nylon-based and polyester-based.

The resin foam may be a thermoplastic resin.

The present invention to achieve another object,

Coating a surface of the resin with an antistatic composition comprising a conductive polymer, an ionic liquid and a carbon nanotube alone or a mixture thereof, and a thermoplastic resin;

A heating step of putting the resin and the blowing agent coated with the antistatic composition into a reactor and heating the same; And

It provides a method for producing an antistatic resin foam comprising an expansion step of expanding the heated resin by exposure to the atmosphere.

The resin may be in the form of beads or pellets.

In the coating step, the antistatic composition may be added dropwise to 0.5 to 80 parts by weight based on the resin.

The blowing agent may be added in a weight ratio of 1: 5 to 1:50 relative to the resin.

The present invention to achieve another object,

It provides an antistatic packaging box molded from the antistatic resin foam.

The antistatic resin foam of the present invention is uniformly coated with the antistatic composition to provide excellent antistatic properties, and excellent adhesion between the resin foams during molding, and excellent physical and chemical properties such as impact mitigation, cracking or chemical resistance Moldings can be provided.

Since the antistatic resin foam of the present invention exhibits excellent antistatic properties, dust does not occur in the molding process, thereby improving work efficiency.

Since the antistatic resin foam of the present invention exhibits high transparency, it is possible to provide a molded article having a desired color.

The antistatic resin foam of the present invention prevents the influx of contaminants due to static electricity when used in the packaging box of the electronic product, it is possible to provide an antistatic packaging box that can prevent changes in the physical properties of the electronic product.

Since the antistatic resin foam of the present invention does not need to apply an antistatic material coating film to the packaging box when applied to the packaging box of the electronic product, it is possible to simplify the manufacturing process of the packaging box. In addition, it is possible to prevent the antistatic property caused when the coating film damage by friction.

Hereinafter, the present invention will be described in detail so that those skilled in the art can easily practice.

The present invention provides an antistatic resin foam.

The antistatic resin foam is coated with an antistatic composition on the resin foam surface. The antistatic resin foam is coated with an antistatic composition on the surface to exhibit excellent antistatic properties, it is possible to improve the adhesion between the resin foam when molding the resin foam.

The resin foam may be a thermoplastic resin such as polyolefin-based, polyester-based, PA (polyamide; nylon), PET (polyethylene terephthalate), ABS, polystyrene, etc., but is not limited thereto.

The antistatic composition comprises a conductive material. The conductive material may provide an antistatic performance to the resin foam and may improve surface resistance and transparency of the antistatic composition. The conductive material may be a single or a mixture thereof selected from the group consisting of carbon nanotubes, conductive polymers, and ionic liquids.

The conductive polymer is a π-conjugated water soluble or organic solvent soluble conductive polymer, specifically, selected from the group consisting of polyaniline, polypyrrole, polythiophene, poly (3,4-ethylenedioxythiophene), derivatives or copolymers thereof It may be alone or a mixture thereof.

The carbon nanotubes are molecules in the form of tubes formed by rounding a graphite plate formed by connecting hexagonal rings composed of six carbons to each other, and are excellent in antistatic performance and also excellent in mechanical strength such as rigidity. In addition, the carbon nanotubes may be used alone in the antistatic composition, but may be preferably mixed with the conductive polymer and the ionic liquid in order to provide excellent surface resistance and transparency. In other words, when the conductive polymer or the ionic liquid is used together, the conductive polymer and the ionic liquid act as a bridge to facilitate electron transfer between the carbon nanotubes and the carbon nanotube particles, thereby improving surface resistance and transparency of the coating film. Can be.

The type of carbon nanotubes can be used without limitation to those known in the art, and specifically, may be selected from single-walled carbon nanotubes, double-walled carbon nanotubes, multi-walled carbon nanotubes and bundled carbon nanotubes, and combinations thereof. May be, but is not limited thereto. The carbon nanotubes may have a diameter of 1 to 100 nm and a length of 1 to 500 μm. When the diameter or length is out of the range, the dispersibility or transparency of the antistatic composition may be lowered.

The ionic liquid may provide antistatic properties to the antistatic composition, and in particular, may improve transparency of the composition. The ionic liquid is a salt formed by combining cations and anions.

The cation is ammonium, phosphonium, pyridinium, imidazolium, benzimidazoli, pyrazolium, benzpyrazolium, indazolium, thiazolium, benzthiazolium, oxazolium, benzoxazolium, isothiazolium, guani Dinium, quinuclidinium, triazium, tetrazolium, quinolinium, isoquinolinium, piperidinium, pyrrolidinium, morpholinium, pyridazinium, pyrazinium, piperazinium, triazinium, azure Zepine, and diazepine.

The anion may be selected from the group consisting of MA _m ⁻ , alkylsulfonyl, haloalkylsulfonyl, phosphoryl, metide, imide and carbonyl groups. M in MA _m ^- is an element of group VIII, IB, 2B, IIIA or VA on a periodic table (CAS version), A is a halide, and m is an integer of 2-15. Specifically, the anion is ^- may be a _{C (SO 2 R) 3 (} R is C ₁ ~C ₁₅ alkyl or aryl ^{_{group) - O (SO 2 R)}} , - N (SO 2 R) 2,.

More specifically, the ionic liquid can be selected from:

Wherein R, R ', R "is independently hydrogen, alkyl or aryl group of C ₁ ~C _15,

The _{- (CH-CH 2) n} - wherein n is an integer from 2 to 15 in, X ^- is MA _m ^-, alkylsulfonyl, haloalkylsulfonyl, phosphoryl, methide, and imide or carbonyl group, wherein M It is an element of group VIII, IB, 2B, IIIA, or VA on this periodic table (CAS version), A is a halide, m is an integer of 2-15.

The conductive material may be included in an amount of 0.5 to 40 parts by weight, and preferably 5 to 30 parts by weight, based on the antistatic composition. When included in less than 0.5 parts by weight it may be difficult to achieve the object of the present invention to improve the antistatic performance, when included in excess of 40 parts by weight may reduce the dispersibility and transparency of the antistatic composition.

The antistatic composition comprises a thermoplastic resin. The thermoplastic resin may enhance the adhesive force between the foams during molding of the resin foam. The thermoplastic resin may be a polyolefin such as polyurethane (TPU), polyvinyl chloride (PVC), polyvinyl alcohol, polyvinyl acetal, polyvinyl butadiene, polyvinylpyrrolidinone, polypropylene, polyethylene, polyvinyl, It may be a single or a mixture thereof selected from the group consisting of ABS (Acrylonitrile Butadiene Styrene), SBS (styrene-butadien block copolymer), polycarbonate, polystyrene-based, nylon-based, polyester-based.

The thermoplastic resin may include 0.05 to 5 parts by weight based on the antistatic composition. If the content is less than 0.05 parts by weight, the contact force between the resin foams may not be improved. If the content is more than 5 parts by weight, the conductivity of the composition may be lowered by the thermoplastic resin.

The antistatic composition further comprises a dispersant and a residual amount of solvent.

The dispersant may improve the transparency of the composition by providing a uniform mixture of the conductive material and the thermoplastic resin. The dispersant may be used without limitation to those known in the art, specifically, surfactants, primary amines, secondary amines, tertiary amine compounds, ammonium carbamate, ammonium carbonate, ammonium bicarbonate, ethyl It may be a single or a mixture thereof selected from the group consisting of cellussolve, methylcellulose solution and ethylene glycol.

The dispersant may be included in an amount of 0.05 to 5 parts by weight based on the antistatic composition. When included in less than 0.05 parts by weight may reduce the dispersibility of the constituents of the composition, if it is more than 5 parts by weight may be reduced the conductivity of the resin foam due to the use of excess dispersant.

The solvent may be used without limitation, those known in the art, specifically, water, dimethyl sulfoxide (DMSO), dimethylformamide (DMF), N-methyl-2-pyrrolidinone (NMP), 2-butane Polar organic solvents such as on, 4-methyl-2-pentanone and the like, and alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, isobutyl alcohol, t-butyl alcohol, benzyl alcohol, ethylene glycol, etc. Alcohol can be used. The solvent is included in the remaining amount, specifically, may be included in 55 to 99 parts by weight based on the resin composition.

The present invention relates to a method for producing the antistatic resin foam.

The antistatic resin foam includes a coating step, a heating step and an expansion step.

The coating step is a process of coating the antistatic composition on the surface of the thermoplastic resin by placing the thermoplastic resin in the mixing device, and stirring at a constant stirring speed to drop the total amount or slowly the antistatic composition.

The thermoplastic resin is polyolefin-based, polyvinyl-based, such as polypropylene and polyethylene such as polyurethane (TPU), polyvinyl chloride (PVC), polyvinyl alcohol, polyvinyl acetal, polyvinyl butadiene, polyvinylpyrrolidinone, It may be a single or a mixture thereof selected from the group consisting of ABS (Acrylonitrile Butadiene Styrene), SBS (styrene-butadien block copolymer), polycarbonate, polystyrene-based, nylon-based, polyester-based. The thermoplastic resin may be in the form of beads or pellets, preferably in the form of pellets, more preferably in mini pellets having a size of 1 micro to 3 centimeters (the term mini means Is unclear so please let us know the particle size). The pellet is easy to handle in the molding process, the coating can be made smoothly when coating with the antistatic composition. The pellets can also improve the impact resilience of the final molding.

The antistatic composition may be added dropwise to 0.5 to 80 parts by weight, preferably 20 to 50 parts by weight with respect to the thermoplastic resin. If it is added in less than 0.5 parts by weight, it may be difficult to achieve the object of the present invention to impart antistatic properties to the thermoplastic resin, if it is added in excess of 80 parts by weight of the antistatic composition may be excessively used to increase the manufacturing cost In addition, the effect of improving the antistatic performance can no longer be obtained compared to the amount of the composition added.

The mixing device may be a Hansel mixer, a super mixer, a micro mixer, a tumbler, or the like. The stirring speed is 25 to 200rpm, preferably 25 to 100rpm to form a uniform coating layer on the resin surface.

The method for producing the antistatic resin foam may further include a drying step.

The drying step is a process of drying the resin coated with the antistatic composition. The drying step is dried at 10 to 80 ℃, does not particularly limit the drying apparatus and time.

In the heating step, the coated resin is added in a foaming reactor, and then a blowing agent is added. Next, the reactor is heated at a high pressure and simultaneously stirred.

The blowing agent may be used without limitation those known in the art, but may be carbon dioxide, butane or pentane. The blowing agent may be added in a weight ratio of 1: 5 to 1:50 with respect to the coated resin, and when the blowing agent is added in an amount less than 5 weight ratios, the foamability of the resin may be reduced or an unfoamed resin may be generated. If exceeded, uneven foaming may occur due to excessive blowing agent.

The heating step heats the reactor temperature to 100 to 200 ° C and is carried out for 20 to 60 minutes. In the heating step, the resin may be changed into an oval shape.

The expanding step is a step of expanding the heated resin by exposure to the atmosphere. In the heating step, the pellet resin changed into an elliptic form and the bead resin changed into an elliptic form are expanded to a volume ratio of 5 to 45 times the volume of the exposure directly while being exposed to the air, thereby forming a spherical resin foam coated with an antistatic composition. .

The present invention provides an antistatic packaging box using the resin foam.

The antistatic packaging box may have an excellent antistatic performance to use a resin foam coated with an antistatic composition on the surface. This antistatic performance can prevent the contamination by static electricity generated during the storage of the product. Further, by using the resin foam coated with the antistatic composition, dust generation during molding of the resin foam is reduced, and an antistatic coating film is formed on the surface of the box to form antistatic properties in the manufacture of the antistatic packaging box. no need. The antistatic packaging box provides high stability against external impact during packaging and transportation of electronic components and display liquid crystal display devices and glasses used therein.

The packaging box may be manufactured using an expansion step and a molding step.

The expansion step is a step of expanding by expanding the antistatic resin foam according to the present invention. In the expanding step, the antistatic resin foam is placed in a pressure tank maintained at an internal temperature of 40 to 60 ° C., and the antistatic resin foam is expanded while maintaining a pressure of 0.5 to 40 kg / cm 2. The holding time can be arbitrarily adjusted by those skilled in the art according to the expansion ratio.

The molding step is a process of filling the expanded antistatic resin foam into a mold and melting by applying steam. When the expanded antistatic resin foam is filled in a cavity of the mold and steam is applied at 40 to 150 ° C., the foam surface is melted to produce a packaging box having a desired shape.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. This is only for the purpose of explanation of the present invention, and thus the scope of the present invention is not limited.

≪ Example 1 >

1-1. Preparation of Antistatic Composition

3% by weight of carbon nanotubes (Hana Nano, multi-walled carbon nanotubes), 2% by weight of poly (3,4-ethylenedioxythiophene, Baytron PH), 1% by weight of polyvinyl alcohol (PVA), 0.5% by weight of ethyl cell solution %, 20 wt% methanol, 71 wt% isopropyl alcohol, 2.5 wt% 1-methyl-2-pyrrolidinone were mixed to prepare an antistatic composition.

1-2. Preparation of Minipellet Resin Coated with Antistatic Composition

100 g of polyethylene pellets were added to a Hansel mixer, and then 40 g of the antistatic composition prepared in Example 1-1 was slowly added dropwise and sufficiently stirred for 1 to 2 hours. After the low-speed stirring at a speed of 25 ~ 100rpm so that the transparent antistatic composition is evenly coated on the polyethylene pellet surface, and dried at room temperature to 40 ℃, it was confirmed whether the coating liquid.

1-3. Preparation of Minipellet Resin Foam

100 g of the polyethylene resin coated with the antistatic composition prepared in Example 1-1 was added to the reactor and carbon dioxide was added at a weight ratio of 1:10 to the polyethylene resin and maintained at a high pressure at a temperature of 150 ° C. Heated to and stirred for about 30 minutes, during which the polyethylene pellet was deformed into an elliptical form. Oval-modified polyethylene pellets were exposed to atmospheric conditions to prepare expanded spherical foams at about 15 and 30 magnification.

1-4. Manufacture of Antistatic Packaging Boxes

The foam prepared in Example 1-3 was filled in the cavity of the mold, and the surface of the foam was melted by steam at 60 to 70 ° C. to prepare an antistatic packing box.

<Example 2>

In Example 1-1, 2% by weight of 1-butyl-3-methylimidazolium trifluoromethanesulfonate (Covalent Associates, Inc.), 3% by weight of carbon nanotubes (nano Han, multi-walled carbon nanotubes) , 1% by weight polyvinyl alcohol (PVA), 1% by weight ethylcellulose, 20% by weight methanol, 70.5% by weight isopropyl alcohol, 2.5% by weight of 1-methyl-2-pyrrolidinone to prepare an antistatic composition It was. A polyethylene foam and an antistatic packaging box were manufactured in the same manner as in Example 1 except that an antistatic composition was prepared.

<Example 3>

In Example 1-1, 2 wt% 1-butyl-3-methylimidazolium trifluoromethanesulfonate (Covalent Associates, Inc.), 3 wt% poly (3,4-ethylenedioxythiophene, Baytron PH) %, 1% by weight of polyvinyl alcohol (PVA), 1% by weight of ethyl celusolve, 20% by weight of methanol, 70% by weight of isopropyl alcohol, and 3% by weight of 1-methyl-2-pyrrolidinone were mixed. A polyethylene foam and an antistatic packaging box were prepared in the same manner as in Example 1 except that the same was prepared.

<Example 4>

1-butyl-3-methylimidazolium trifluoromethanesulfonate (Covalent Associates, Inc.) 5% by weight, polyvinyl alcohol (PVA) 1% by weight, ethylcellulsolve 1% by weight, methanol 20% by weight, iso A polyethylene foam and an antistatic packaging box were manufactured in the same manner as in Example 1, except that 70 wt% of propyl alcohol and 3 wt% of 1-methyl-2-pyrrolidinone were prepared.

Example 5

5% by weight poly (3,4-ethylenedioxythiophene, Baytron PH), 1% by weight polyvinyl alcohol (PVA), 1% by weight ethylcellulose solution, 20% by weight methanol, 70% by weight isopropyl alcohol, 1-methyl A polyethylene foam and an antistatic packaging box were manufactured in the same manner as in Example 1, except that 3 wt% of 2-pyrrolidinone was mixed to prepare an antistatic composition.

<Example 6>

5% by weight of carbon nanotubes (Hana Nano, multi-walled carbon nanotubes), 1% by weight of polyvinyl alcohol (PVA), 1% by weight of ethyl cellosolve, 20% by weight of methanol, 70% by weight of isopropyl alcohol, 1-methyl- A polyethylene foam and an antistatic packaging firm were manufactured in the same manner as in Example 1, except that 3 wt% of 2-pyrrolidinone was mixed to prepare an antistatic composition.

<Example 7>

In Example 1-1, 20% by weight of 1-butyl-3-methylimidazolium trifluoromethanesulfonate (Covalent Associates, Inc.), 30% by weight of carbon nanotubes (nano Han, multi-walled carbon nanotubes) Except that 1% by weight polyvinyl alcohol (PVA), 1% by weight ethylcellulose solution, 10% by weight methanol, 35.5% by weight isopropyl alcohol, and 2.5% by weight of 1-methyl-2-pyrrolidinone were used. A polyethylene foam and an antistatic packaging box were prepared in the same manner as in Example 1.

<Example 8>

3% by weight of carbon nanotubes (Hanona, multi-walled carbon nanotubes), 2% by weight of poly (3,4-ethylenedioxythiophene, Baytron PH), 8% by weight of polyvinyl alcohol (PVA), 0.5% by weight of ethyl cell solution A polyethylene foam and an antistatic packaging box were prepared in the same manner as in Example 1 except for using the antistatic composition of%, 20% by weight of methanol, 64% by weight of isopropyl alcohol, and 2.5% by weight of 1-methyl-2-pyrrolidinone. It was.

Comparative Example 1

1-1. 5% by weight of conductive carbon black (Aldrich), 3% by weight of acrylic-urethane copolymer binder (Stahl AsiaPte Ltd., WF-4644), 30% by weight of methanol, 60% by weight of isopropyl alcohol, 2% by weight of dispersant (STS, Aldrich) To prepare an antistatic composition.

1-2. 100 g of polyethylene pellets were added to a mixer, and 30 g of the antistatic composition prepared in Comparative Example 1-1 was slowly added thereto while stirring was continued to coat the composition evenly on the surface of the polyethylene pellets, and then dried at room temperature so that the coating liquid did not appear. To produce a polyethylene pellet coated with an antistatic composition.

1-3. The polyethylene foam and the antistatic packaging box were prepared in the same manner as in Example 1 using the polyethylene pellet prepared in 1-2.

Comparative Example 2

5 wt% surfactant (SDS, Aldrich), 3 wt% acrylic-urethane copolymer binder (Stahl Asia PteLtd., WF-4644), 30 wt% methanol, 60 wt% isopropyl alcohol, 2 wt% dispersant (STS, Aldrich) The antistatic composition was prepared by mixing%. Using the antistatic composition, a polyethylene resin, a polyethylene foam, and an antistatic packaging box were manufactured in the same manner as in Comparative Example 1.

Comparative Example 3

3% by weight of carbon nanotubes (hanwha, multi-walled carbon nanotubes), 2% by weight of poly (3,4-ethylenedioxythiophene, Baytron PH), acrylic-urethane copolymer binder (Stahl Asia PteLtd., WF-4644) An antistatic composition was prepared by mixing 3% by weight, 30% by weight methanol, 60% by weight isopropyl alcohol, and 2% by weight dispersant (STS, Aldrich). Using the antistatic composition, a polyethylene foam and an antistatic packaging box were prepared in the same manner as in Comparative Example 1.

Experimental Example 1

Surface resistance, color, dust generation and adhesion of the polyethylene resin and the antistatic packaging box prepared in Examples 1 to 6 and Comparative Examples 1 to 3 were measured by the following method and are shown in Table 1 below.

How to measure property

1. Surface resistance measurement: TRUSTAT ST-3 (Simco Japan, Inc.), surface resistance test, the surface of the specimen was measured 10 times and the average value was recorded.

2. Color: Visually confirmed using a color coordinate system and displayed.

3. Dust generation: After washing for 10 minutes in the ultrasonic cleaner was confirmed whether dust generation.

4. Adhesion: After cutting using the Cross Cut method, the 3M Tape was measured by attaching and detaching with the same load (500g). The number of pieces dropped on the detachable surface was measured and measured.

Item practice
Example 1 practice
Example 2 practice
Example 3 practice
Example 4 practice
Example 5 practice
Example 6 practice
Example 7 practice
Example 8 Surface resistance (Ω / sq.)
(15 times foam packing box) 10 ⁶ 10 ⁶ 10 ⁶ 10 ⁶ 10 ⁶ 10 ⁶ 10 ⁵ 10 ⁷ Surface resistance (Ω / sq.)
(30 times foam packing box) 10 ⁷ 10 ⁷ 10 ⁷ 10 ⁸ 10 ⁸ 10 ⁸ 10 ⁷ 10 ⁹ color light
grey light
grey light
blue Transparency light
blue light
grey Dark brown light
Brown Dust occurrence none none none none none none none none Adhesion (B) 5B 5B 5B 5B 5B 5B 4B 5B

Item compare
Example 1 compare
Example 2 compare
Example 3 Surface resistance (Ω / sq.)
(15 times foam packing box) 10 ⁷ 10 ¹⁰ 10 ⁶ Surface resistance (Ω / sq.)
(30 times foam packing box) 10 ¹⁰ Isolation 10 ¹⁰ color black Transparency light
grey Dust occurrence Occur transition none Adhesion (B) 2B B 3B

As shown in Table 1 and Table 2, the surface resistance of the packaging box made of the polyethylene resin foam according to the present invention has a lower value than the comparative example, excellent antistatic performance, and improved adhesion between the polyethylene resin foam You can see that.

The polyethylene resin foam according to the present invention has improved transparency compared with the case of using conventional carbon black.

When the polyethylene resin foam according to the present invention includes a thermosetting resin, it can be seen that the adhesion between the surface resistance and the polyethylene resin foam is improved.

The antistatic resin foam according to the present invention is coated with an antistatic composition so that there is no dust generated during the manufacture of the packaging box, and thus the workability is excellent. Can be simplified. In addition, the resin foam may provide a packaging box having excellent impact resilience against external impact by excellent adhesion between the resin foam in the molding process.

Accordingly, the antistatic resin foam according to the present invention can provide an antistatic packaging box which is excellent in antistatic property and impact relaxation property, which can be usefully applied to transport and transportation of electronic products.

Claims (14)

Single or a mixture thereof selected from the group consisting of conductive polymers, ionic liquids and carbon nanotubes; And an antistatic composition comprising a thermoplastic resin. The method of claim 1,
The antistatic composition is
1 to 40% by weight alone or a mixture thereof selected from the group consisting of conductive polymers, ionic liquids and carbon nanotubes;
0.05 to 5 wt% thermoplastic resin;
0.05-5% by weight of dispersant; And
An antistatic resin foam comprising a residual amount of solvent. The method of claim 1,
The antistatic resin foam, characterized in that the conductive polymer is selected from the group consisting of polyaniline, polypyrrole, polythiophene, poly (3,4-ethylenethiophene), derivatives and copolymers thereof. The method of claim 1,
In the ionic liquid, the cation is ammonium, phosphonium, pyridinium, imidazolium, imidazolium, benzimidazoli, pyrazolium, benzpyrazolium, indazolium, thiazolium, benzthiazolium, oxazolium, benzoxa Zolium, isothiazolium, guanidinium, quinuclidinium, triazium, tetrazolium, quinolinium, isoquinolinium, piperidinium, pyrrolidinium, morpholinium, pyridazinium, pyrazinium, pipepe Antistatic resin foam, characterized in that selected from the group consisting of lazinium, triazium, azepineium, and diazepineium. The method of claim 1,
The anion in the ionic liquid is selected from the group consisting of MA _m ⁻ , alkylsulfonyl, haloalkylsulfonyl, phosphoryl, methide, imide and carbonyl group,
M is an element of group VIII, IB, 2B, IIIA or VA on a periodic table (CAS version), A is a halide and m is an integer of 2-15, The antistatic resin foam characterized by the above-mentioned. The method of claim 1,
An antistatic resin foam, wherein the ionic liquid is selected from:

(R, R ', R "is independently hydrogen, alkyl or aryl group of C ₁ ~C _15,
The - (CH-CH ₂₎ n is an integer from 2 to 15 in the n-, X ^- is MA _m ^-, alkylsulfonyl, haloalkylsulfonyl, phosphoryl, methide, and imide or carbonyl group, wherein M An element of group VIII, IB, 2B, IIIA or VA on the periodic table (CAS version), A is a halide, and m is an integer from 2 to 15. The method of claim 1,
The carbon nanotubes have a diameter of 1 to 100 nm, the length of the antistatic resin foam, characterized in that 1 to 500 ㎛. The method of claim 1,
The thermoplastic resin is polyurethane (TPU), polyvinyl chloride (PVC), polyvinyl alcohol, polyvinyl acetal, polyvinyl butadiene, polyolefin of polyvinylpyrrolidinone and polyolefin of polyethylene, polyvinyl, ABS, Antistatic resin foam, characterized in that one or a mixture thereof selected from SBS, polycarbonate, polystyrene-based, nylon-based and polyester-based. The method of claim 1,
An antistatic resin foam, wherein the resin foam is a thermoplastic resin. Coating a surface of the resin with an antistatic composition comprising a conductive polymer, an ionic liquid and a carbon nanotube alone or a mixture thereof, and a thermoplastic resin;
A heating step of putting the resin and the blowing agent coated with the antistatic composition into a reactor and heating the same; And
And an expansion step of expanding the heated resin by exposure to the atmosphere. The method of claim 10,
Method for producing an antistatic resin foam, characterized in that the thermoplastic resin is in the form of beads or pellets. The method of claim 10,
Method for producing an antistatic resin foam, characterized in that the antistatic composition is added dropwise 0.5 to 80 parts by weight based on the thermoplastic resin in the coating step. The method of claim 10,
Method for producing an antistatic resin foam, characterized in that the blowing agent is added in a weight ratio of 1: 5 to 1: 50 relative to the resin. An antistatic packaging box, which is molded from the antistatic resin foam according to any one of claims 1 to 9.