WO2017131317A1 - Antistatic tray and manufacturing method therefor - Google Patents

Abstract

The present invention relates to an antistatic tray manufactured by using a composite material, which has an optimal composition improving mechanical strength and, simultaneously, is capable of maintaining electrical characteristics and formability, thereby having excellent material properties such as strength and an antistatic property.

Description

Antistatic tray and its manufacturing method

This application claims the benefit of priority based on Korean Patent Application No. 10-2016-0009645 filed on January 26, 2016, and all contents disclosed in the literature of that Korean patent application are incorporated as part of this specification.

The present invention relates to an antistatic tray having improved moldability and mechanical properties and a method of manufacturing the same.

Recently, due to the development of electronic technology, miniaturization, high integration, and high performance of electronic products have been achieved. Accordingly, in order to prevent electrical damage that may occur during the transport and storage of materials such as electronic products and components, electrically conductive materials are used. .

For example, IC trays are used for the above uses, and they are used for transfer between manufacturing processes of semiconductor chips and packaging after manufacturing. The IC tray determines the size and shape of the tray according to the type and type of the semiconductor chip, and may play a role of preventing damage such as electric shock due to dust, moisture, and the like on a component on which a circuit or the like is printed. Baking the tray containing the component during the manufacturing process of the component, in order to remove moisture, the tray is heat-resistant and stability before and after baking, low distortion, electrostatic dispersion, surface resistance, electrical Physical properties such as conductivity are required.

Conventionally, in order to satisfy the above properties, a material using carbon fiber is mainly applied to an electronic component tray.

However, in the case of the tray containing the carbon fiber, there is a limit in improving the formability and mechanical properties. Specifically, there is a problem that the improvement of tensile strength and flexural strength is not sufficient, and the impact strength may be low, and molding may not be easy.

Therefore, research on the optimum composition for improving the physical properties such as tensile strength, flexural strength, impact strength and the like while maintaining the surface resistance characteristics of the antistatic tray for electronic parts is required.

It is an object of the present invention to provide an antistatic tray having improved moldability and mechanical properties.

Another object of the present invention is to provide a method of manufacturing the antistatic tray.

In order to solve the above problems, the present invention

Provided is an antistatic tray made of a composite comprising 40 to 95 weight percent polycarbonate, 0.1 to 10 weight percent carbon nanotubes, and 1 to 50 weight percent glass fibers, based on the total weight of the composition.

According to one embodiment, the average length of the carbon nanotubes may be 1 to 500㎛.

In addition, the maximum length of the carbon nanotubes may be 500㎛.

According to one embodiment, the aspect ratio of the carbon nanotubes may be 10 to 1,000,

The aspect ratio is calculated according to the following formula (1).

[Equation 1]

Aspect Ratio = Length (L) / Diameter (D)

According to one embodiment, the average length of the glass fiber may be 4mm.

In addition, the maximum length of the glass fiber may be 20mm.

According to one embodiment, the tensile strength of the antistatic tray may be greater than or equal to 1,000kg / cm ^2.

In addition, the bending strength of the antistatic tray may be 1,600kg / cm ^{2 or} more.

In addition, the impact strength of the antistatic tray may be 8kg · cm / cm or more.

According to another embodiment of the invention,

Preparing a composite by mixing 40 to 95 wt% polycarbonate, 0.1 to 10 wt% carbon nanotubes, and 1 to 50 wt% glass fibers based on the total weight of the composition; And

Molding the composite may provide an antistatic tray manufacturing method comprising the step of manufacturing an antistatic tray.

According to one embodiment, the carbon nanotubes may be prepared by catalytic chemical vapor deposition (CCVD).

In addition, according to one embodiment, the composite material is antibacterial, release agent, thermal stabilizer, antioxidant, light stabilizer, compatibilizer, dye, inorganic additive, surfactant, nucleating agent, coupling agent, filler, plasticizer, impact modifier, admixture, coloring agent It may further comprise at least one selected from the group consisting of lubricants, antistatic agents, pigments, flame retardants and mixtures of one or more thereof.

Other specific details of embodiments of the present invention are included in the following detailed description.

According to the antistatic tray and the manufacturing method according to the present invention, it is possible to improve the mechanical properties such as tensile strength, flexural strength and impact strength while maintaining the electrostatic dispersion characteristics, that is, the surface resistance characteristics. It can be usefully used as an antistatic tray requiring moldability.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

As used herein, the term “composite” may be used interchangeably with “composite material” within this specification, and may be understood to mean a material formed by gathering two or more materials.

It is to be understood that the term "carbon nanotube" as used herein may mean singular or plural sets including one or more entities.

In addition, the term "molding" may be used interchangeably with "processing" within the present specification, and may be understood to form a target shape by applying heat or pressure.

Hereinafter, an antistatic tray according to an embodiment of the present invention and a manufacturing method thereof will be described in more detail.

Charging refers to a phenomenon in which a neutral substance having the same positive and negative charges exhibits a negative or positive charge while the balance of charge is broken by external force. Due to the charging phenomenon as described above, static electricity may be generated, and when the static electricity is discharged, electronic parts such as semiconductors may be damaged by electric shock, and conditions such as dust such as dust may be formed.

In order to prevent this phenomenon, there is a method of preventing the separation of charges, a method of using a high dielectric constant material to reduce the local electric field caused by the charge separation, the air near the dielectric to increase the rate of leakage of the separation charge And ionization method may be applied.

The present invention to prevent the charging phenomenon as described above,

Provided is an antistatic tray made of a composite comprising 40 to 95 weight percent polycarbonate, 0.1 to 10 weight percent carbon nanotubes, and 1 to 50 weight percent glass fibers, based on the total weight of the composition.

The antistatic tray according to the present invention can improve physical properties such as tensile strength and impact strength while maintaining surface resistance while using carbon nanotubes instead of carbon fibers as carbon materials.

The polycarbonate resin may be prepared by reacting diphenols with phosgene, halogen formate, carbonate ester or a combination thereof. Specific examples of the diphenols include hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl, 2,2-bis (4-hydroxyphenyl) propane (also called 'bisphenol-A'), 2, 4-bis (4-hydroxyphenyl) -2-methylbutane, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 2,2-bis (3-chloro 4-hydroxyphenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) propane, 2 , 2-bis (3,5-dibromo-4-hydroxyphenyl) propane, bis (4-hydroxyphenyl) sulfoxide, bis (4-hydroxyphenyl) ketone, bis (4-hydroxyphenyl) Ether and the like. Among these, 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) propane or 1,1-bis (4-hydroxyphenyl) Cyclohexane can be used, more preferably 2,2-bis (4-hydroxyphenyl) propane.

The polycarbonate resin may be a mixture of copolymers prepared from two or more diphenols. Also, the polycarbonate resin may be a linear polycarbonate resin, a branched polycarbonate resin, a polyester carbonate copolymer resin, or the like.

Bisphenol-A type | system | group polycarbonate resin etc. are mentioned as said linear polycarbonate resin. Examples of the branched polycarbonate resins include those produced by reacting polyfunctional aromatic compounds such as trimellitic anhydride, trimellitic acid, and the like with diphenols and carbonates. The polyfunctional aromatic compound may be included in an amount of 0.05 to 2 mol% based on the total amount of the branched polycarbonate resin. As said polyester carbonate copolymer resin, what was manufactured by making bifunctional carboxylic acid react with diphenols and a carbonate is mentioned. In this case, as the carbonate, diaryl carbonate such as diphenyl carbonate, ethylene carbonate, or the like may be used.

The content of the polycarbonate may be 40 to 95% by weight, preferably 60 to 90% by weight or 70 to 90% by weight based on the total weight of the composition.

In addition to the polycarbonate, various resins may be used in the composite composition or may be added together as necessary. For example, polypropylene resin, aramid resin, aromatic polyester resin, polyolefin resin, polyester carbonate resin, polyphenylene oxide resin, polysulfone resin, polyethersulfone resin, polyarylene resin, cycloolefin resin, poly Etherimide resin, polyacetal resin, polyvinyl acetal resin, polyketone resin, polyetherketone resin, polyetheretherketone resin, polyarylketone resin, polyethernitrile resin, liquid crystal resin, polybenzimidazole resin, polyparabanic acid Vinyl polymer or copolymer resin obtained by superposing | polymerizing or copolymerizing 1 or more types of vinyl monomers chosen from the group which consists of resin, aromatic alkenyl compound, methacrylic acid ester, acrylic acid ester, and a vinyl cyanide compound, diene-aromatic alkenyl Compound copolymer resin, vinyl cyanide-diene-aromatic Kenyl compound copolymer resin, aromatic alkenyl compound-diene-vinyl cyanide-N-phenylmaleimide copolymer resin, vinyl cyanide- (ethylene-diene-propylene (EPDM))-aromatic alkenyl compound copolymer resin, polyolefin, chloride At least one selected from the group consisting of vinyl resins and chlorinated vinyl chloride resins can be used. Specific kinds of these resins are well known in the art, and examples which can be used in the composition of the present invention may be appropriately selected by those skilled in the art.

Examples of the polyolefin resins include, but are not limited to, polypropylene, polyethylene, polybutylene, and poly (4-methyl-1-pentene), and combinations thereof. In one embodiment, the polyolefin may be a polypropylene homopolymer (e.g., atactic polypropylene, isotactic polypropylene, and syndiotactic polypropylene), polypropylene copolymer (e.g., Polypropylene random copolymers), and mixtures thereof. Suitable polypropylene copolymers include, but are not limited to, the presence of comonomers selected from the group consisting of ethylene, but-1-ene (ie 1-butene), and hex-1-ene (ie 1-hexene). And random copolymers prepared from the polymerization of propylene under. In such polypropylene random copolymers, comonomers may be present in any suitable amount, but typically in amounts of about 10 wt% or less (eg, about 1 to about 7 wt%, or about 1 to about 4.5 wt%) May exist.

As said polyester resin, the homopolyester and copolyester which are polycondensates of a dicarboxylic acid component skeleton and a diol component skeleton are mentioned. As the homo polyester, for example, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, poly-1,4-cyclohexanedimethylene terephthalate, polyethylene diphenylate Etc. are typical. In particular, since polyethylene terephthalate is inexpensive, it can be used for a very wide range of applications, which is preferable. In addition, the said copolyester is defined as the polycondensate which consists of at least 3 or more components chosen from the component which has a dicarboxylic acid skeleton and the component which have a diol skeleton which are illustrated next. Examples of the component having a dicarboxylic acid skeleton include terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4 ' -Diphenyl dicarboxylic acid, 4,4'- diphenyl sulfone dicarboxylic acid, adipic acid, sebacic acid, dimer acid, cyclohexanedicarboxylic acid, ester derivatives thereof, and the like. Examples of the component having a glycol skeleton include ethylene glycol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentadiol, diethylene glycol, polyalkylene glycol, 2,2-bis ( 4 '-(beta) -hydroxyethoxyphenyl) propane, isosorbate, 1, 4- cyclohexane dimethanol, spiroglycol, etc. are mentioned.

As said cycloolefin type polymer, a norbornene type polymer, a monocyclic cyclic olefin type polymer, a cyclic conjugated diene type polymer, a vinyl alicyclic hydrocarbon polymer, and these hydrides are mentioned. Specific examples thereof include Apel (ethylene-cycloolefin copolymer manufactured by Mitsui Chemical Co., Ltd.), aton (norbornene-based polymer manufactured by JSR Corporation), zeonoa (norbornene-based polymer manufactured by Nippon Xeon Corporation), and the like.

The polyphenylene oxide resin is also referred to as polyphenylene ether, and has a structure in which -O- is bonded to a phenylene group as a repeating unit. The phenylene group may have various substituents, for example, methyl group, ethyl group, halogen group, hydroxy group and the like.

Composites for producing an antistatic tray according to the present invention, when the content of the carbon nanotube is less than 0.1% by weight based on the total weight of the composition, physical properties such as surface resistance and strength may be lowered, exceeding 10% by weight In this case, the heat or physical force required during molding may increase. Preferably from 0.5 to 8% by weight or from 1 to 5% by weight.

When the content of the glass fiber is less than 1% by weight based on the total weight of the composition, physical properties such as tensile strength, flexural strength, and impact strength may decrease, and when the content exceeds 50% by weight, the viscosity may be improved. . Preferably from 5 to 30% by weight or 10 to 20% by weight.

According to one embodiment, the average length of the carbon nanotubes may be 1 to 500 μm, for example, 1 to 300 μm, for example 1 to 100 μm, and the maximum length of the carbon nanotubes is 500 May be μm.

In addition, an aspect ratio of the carbon nanotubes may be, for example, 10 to 1,000, for example, 50 to 500, for example, 100 to 200, and according to Equation 1 below. Can be calculated.

[Equation 1]

Aspect Ratio = Length (L) / Diameter (D)

The carbon nanotubes may be, for example, arc discharge, laser ablation, pyrolysis, flame synthesis, chemical vapor deposition, and gas phase growth. It may be prepared from a method such as vapor phase growth.

The arc discharge method may be, for example, a method of generating an arc by using two carbon rods having different diameters, and multi-wall carbon nano according to variables such as pressure and current of an inert gas inside the reactor. In order to synthesize a tube and grow single-walled carbon nanotubes, a metal catalyst is required.

The laser ablation method may generate SWNTs and MWNTs according to the type of graphite mixture and the reaction gas used, for example, by laser cutting graphite particles into an oven at a high temperature of 1200 ° C.

The chemical vapor deposition (CVD) has an advantage that it can be produced evenly in a large area, can be vertically aligned, can be synthesized at a low temperature, and can easily control the structure. The chemical vapor deposition (CVD) is, for example, catalytic carbon vapor deposition (CCVD), thermal CVD method, direct current (DC) plasma CVD method, radio frequency (RF) plasma CVD method And microwave plasma CVD.

The vapor phase growth method is a method of synthesizing carbon nanotubes in a gas phase in a reactor by simultaneously supplying a catalyst metal reactant and a carbonization gas into a reactor without using a substrate, and can be applied to mass synthesis. .

According to one embodiment, the glass fiber may have an average length of 4mm, the maximum length may be 20mm, when the length is short, the improvement of tensile strength and impact strength characteristics may not be sufficient, the length is long In this case, the molding may not be easy due to the high viscosity.

According to one embodiment, the antistatic tray according to the present invention can implement mechanical properties of tensile strength of 1,000kg / cm ² or more, flexural strength of 1,600kg / cm ² or more and impact strength of 8kg · cm / cm or more.

Antistatic tray according to the present invention, based on the total weight of the composition to prepare a composite material by mixing 40 to 95% by weight of polycarbonate, 0.1 to 10% by weight of carbon nanotubes and 1 to 50% by weight of glass fibers ; And

Molding the composite may be produced by a method comprising the step of producing an antistatic tray.

According to one embodiment, the carbon nanotubes may be prepared by catalytic chemical vapor deposition (CCVD). The catalytic chemical vapor deposition method (CCVD) is a method of directly synthesizing carbon nanotubes from a gas phase by directly supplying a reaction gas and an organic metal catalyst into a reactor without using a substrate. It may be suitable for mass synthesis of tubes relatively economically. In addition, it is easy to control the diameter, length, density, structure, crystallinity, etc. of the carbon nanotubes, it is possible to produce high-purity carbon nanotubes, for example, thermal decomposition of organic compounds, catalytic decomposition of hydrocarbons, etc. Can be.

The pyrolysis of the organic compound may be performed at a relatively high decomposition temperature and a relatively low pressure, and an organometallic precursor such as metallocene, iron pentacarbonyl, or the like may be used.

Catalytic cracking of the hydrocarbon may include a metal compound as a catalyst support. As the organometallic compound containing a transition metal catalyst together with the hydrocarbon material, Fe (CO) ₅ or ferrocene (ferrocene) is injected into the reactor, the metal atoms decomposed by the heating furnace to form a bundle in the gas phase, Forming a nucleus for the growth of carbon nanotubes can initiate the synthesis of carbon nanotubes.

According to one embodiment, the antistatic tray according to the present invention is an antibacterial agent, a release agent, a heat stabilizer, an antioxidant, a light stabilizer, a compatibilizer, a dye, an inorganic additive, a surfactant, a nucleating agent, a coupling agent, a filler, a plasticizer, an impact modifier, It may further comprise an additive selected from the group consisting of admixtures, colorants, lubricants, antistatic agents, pigments, flame retardants and mixtures of one or more thereof.

Such additives may be included within a range that does not affect the physical properties such as tensile strength, impact strength, surface resistance of the antistatic tray according to the present invention, 0.1 to 5 parts by weight, based on 100 parts by weight of the polycarbonate, For example, it may be included in an amount of 0.1 to 3 parts by weight.

The antistatic tray according to the present invention may be molded by extrusion, injection or extrusion and injection, but the manufacturing method of the molded article may be suitably used as long as it is a conventional method used in the art, but is not limited to the above description. .

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

Examples 1-2 and Comparative Examples 1-3: Preparation of Antistatic Tray

Pellets having a size of 0.2 mm X 0.3 mm X 0.4 mm were added to the twin screw extruder (L / D = 42, Φ = 40 mm) and melt-extruded while raising the temperature profile to 280 ° C. Was prepared. The prepared pellet was injected into a flat profile at an injection temperature of 280 ° C. in the injection machine to prepare a specimen having a thickness of 3.2 mm, a length of 12.7 mm, and a dog-bone shape.

The components used in Table 1 are as follows, and each content unit is in weight percent based on the total weight of the composition.

Polycarbonate was used as LUPOY 1300-30 of LG Chem.

As the carbon fiber, a chopped fiber (Zoltek) having a diameter of 1 to 30 µm and a length of 6 mm or more was used.

Carbon nanotubes having an average diameter of 10 nm and a length of 1.5 μm prepared by catalytic chemical vapor deposition (CCVD) were used.

The glass fiber used was 10-13 micrometers in diameter, and 4mm in length by Owenscorning.

Ester wax Hywax EP-184, heat stabilizer Ciba Irganox 1076, Irgafos 168 were used as heat stabilizers and lubricants.

division	Carbon material type	Carbon material content	Glass material content	Glass material length (mm)	Polycarbonate content	Heat stabilizers and lubricants
Example 1	Carbon nanotubes	1.5	16	4	81.6	0.9
Example 2	Carbon nanotubes	2.0	18	4	79.1	0.9
Comparative Example 1	Carbon fiber	7.0	-	-	92.1	0.9
Comparative Example 2	Carbon fiber	8.0	-	-	91.1	0.9
Comparative Example 3	Carbon fiber	9.0	-	-	90.1	0.9

Experimental Example: Evaluation of the Characteristics of the Tray

Experimental Example 1

For each of the antistatic tray specimens according to the above Examples and Comparative Examples, the tensile strength was measured by the method according to ASTM D638.

Experimental Example 2

For each antistatic tray specimen according to the Examples and Comparative Examples, the flexural strength was measured by a method according to ASTM D790.

Experimental Example 3

For each of the antistatic tray specimens according to the Examples and Comparative Examples, the flexural modulus was measured by a method according to ASTM D790.

Experimental Example 4

For each antistatic tray specimen according to the Examples and Comparative Examples, the impact strength was measured by a method according to ASTM D256.

Experimental Example 5

For each of the antistatic tray specimens according to the Examples and Comparative Examples, the surface resistance was measured by the method according to ASTM D257.

Experimental Example 6

For each antistatic tray specimen according to the Examples and Comparative Examples, the heat deflection temperature was measured by a method according to ASTM D648.

Experimental Example 7

For each of the antistatic tray specimens according to the above Examples and Comparative Examples, the spiral flow length was measured at 300 ° C. under a thickness of 1.5 mm and a holding pressure of 2000 kg / cm ² .

The results of the experimental example are shown in Table 2 below.

division	Tensile Strength (kg / cm 2 )	Flexural Strength (kg / cm 2 )	Flexural modulus (kg / cm 2 )	Impact strength (kgcm / cm)	Surface resistance (ohm / sq)	Spiral flow length (cm)	Heat deflection temperature (℃)
Example 1	1,031	1,684	54,772	10.3	10 5	25.5	131.8
Example 2	1,113	1,762	59,772	11.9	10 5	24.3	131.8
Comparative Example 1	915	1,479	57,747	5.4	10 5 -10 10	24.3	133.5
Comparative Example 2	958	1,505	59,624	5.4	10 5	24.1	135.0
Comparative Example 3	998	1,573	67,580	5.5	10 4 -10 5	24.0	134.6

As shown in Table 2, since both the heat distortion temperature is 130 ℃ or more can be applied to a high temperature process, such as baking process, it can be seen that the electrical properties such as surface resistance can be maintained. In addition, it can be seen from the spiral flow values that the examples including the glass fibers and the carbon nanotubes maintain the formability equivalent to those of the comparative examples including the carbon fibers. As can be seen from the strength value, it can be seen that the Example has a higher mechanical strength than the Comparative Example.

Therefore, as can be seen above, according to the antistatic tray according to the present invention, it can be confirmed that the mechanical strength can be improved and the electrical properties and the moldability can be maintained.

As described above in detail specific parts of the present invention, it is apparent to those skilled in the art that such specific descriptions are merely preferred embodiments, and thus the scope of the present invention is not limited thereto. something to do. Thus, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

Claims (12)

1. An antistatic tray comprising 40 to 95 weight percent polycarbonate, 0.1 to 10 weight percent carbon nanotubes and 1 to 50 weight percent glass fibers, based on the weight of the composition.
2. The method of claim 1,

   An antistatic tray having an average length of the carbon nanotubes of 1 to 500㎛.
3. The method of claim 1,

   Antistatic tray of which the maximum length of the carbon nanotubes is 500㎛.
4. The method of claim 1,

   An aspect ratio of the carbon nanotubes is 10 to 1,000,

   An antistatic tray wherein the aspect ratio is calculated according to the following Equation 1:

   [Equation 1]

   Aspect Ratio = Length (L) / Diameter (D).
5. The method of claim 1,

   Antistatic tray of which the average length of the glass fiber is 4mm.
6. The method of claim 1,

   Antistatic tray of which the maximum length of the glass fiber is 20mm.
7. The method of claim 1,

   Antistatic tray of which the tensile strength of the composite material is 1,000kg / cm ² or more.
8. The method of claim 1,

   Antistatic tray that the flexural strength of the composite material is 1,600kg / cm ² or more.
9. The method of claim 1,

   The antistatic tray of which the impact strength of the composite material is 8kg · cm / cm or more.
10. Preparing a composite by mixing 40 to 95 wt% polycarbonate, 0.1 to 10 wt% carbon nanotubes, and 1 to 50 wt% glass fibers based on the total weight of the composition; And

    An antistatic tray manufacturing method comprising the step of manufacturing the antistatic tray by molding the composite.
11. The method of claim 10,

    The carbon nanotubes are prepared by the catalytic chemical vapor deposition method (CCVD) antistatic tray manufacturing method.
12. The method of claim 10,

    The composite material is an antibacterial agent, a mold release agent, a heat stabilizer, an antioxidant, a light stabilizer, a compatibilizer, a dye, an inorganic additive, a surfactant, a nucleating agent, a coupling agent, a filler, a plasticizer, an impact modifier, a admixture, a colorant, a lubricant, an antistatic agent, a pigment, An antistatic tray manufacturing method further comprising an additive selected from the group consisting of flame retardants and mixtures of one or more thereof.