WO2017131317A1 - Plateau antistatique et son procédé de fabrication - Google Patents

Plateau antistatique et son procédé de fabrication Download PDF

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Publication number
WO2017131317A1
WO2017131317A1 PCT/KR2016/011642 KR2016011642W WO2017131317A1 WO 2017131317 A1 WO2017131317 A1 WO 2017131317A1 KR 2016011642 W KR2016011642 W KR 2016011642W WO 2017131317 A1 WO2017131317 A1 WO 2017131317A1
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WO
WIPO (PCT)
Prior art keywords
antistatic tray
antistatic
tray
carbon nanotubes
manufacturing
Prior art date
Application number
PCT/KR2016/011642
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English (en)
Korean (ko)
Inventor
김태형
김석원
김세현
김평기
최석조
조동현
Original Assignee
주식회사 엘지화학
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Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Publication of WO2017131317A1 publication Critical patent/WO2017131317A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/02—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising combinations of reinforcements, e.g. non-specified reinforcements, fibrous reinforcing inserts and fillers, e.g. particulate fillers, incorporated in matrix material, forming one or more layers and with or without non-reinforced or non-filled layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/34—Trays or like shallow containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
    • B65D85/38—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for delicate optical, measuring, calculating or control apparatus
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/14—Glass
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/26—Deposition of carbon only

Definitions

  • the present invention relates to an antistatic tray having improved moldability and mechanical properties and a method of manufacturing the same.
  • 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.
  • a material using carbon fiber is mainly applied to an electronic component tray.
  • Another object of the present invention is to provide a method of manufacturing the antistatic tray.
  • 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 average length of the carbon nanotubes may be 1 to 500 ⁇ m.
  • the maximum length of the carbon nanotubes may be 500 ⁇ m.
  • the aspect ratio of the carbon nanotubes may be 10 to 1,000,
  • the aspect ratio is calculated according to the following formula (1).
  • the average length of the glass fiber may be 4mm.
  • the maximum length of the glass fiber may be 20mm.
  • the tensile strength of the antistatic tray may be greater than or equal to 1,000kg / cm 2.
  • the bending strength of the antistatic tray may be 1,600kg / cm 2 or more.
  • the impact strength of the antistatic tray may be 8kg ⁇ cm / cm or more.
  • 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;
  • Molding the composite may provide an antistatic tray manufacturing method comprising the step of manufacturing an antistatic tray.
  • the carbon nanotubes may be prepared by catalytic chemical vapor deposition (CCVD).
  • CCVD catalytic chemical vapor deposition
  • 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.
  • 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.
  • 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.
  • carbon nanotube as used herein may mean singular or plural sets including one or more entities.
  • 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.
  • 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.
  • the present invention to prevent the charging phenomenon as described above,
  • 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.
  • 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
  • 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.
  • group polycarbonate resin etc. are mentioned as said linear polycarbonate resin.
  • 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.
  • 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.
  • various resins may be used in the composite composition or may be added together as necessary.
  • polystyrene resins examples include, but are not limited to, polypropylene, polyethylene, polybutylene, and poly (4-methyl-1-pentene), and combinations thereof.
  • 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.
  • 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.
  • polyester resin the homopolyester and copolyester which are polycondensates of a dicarboxylic acid component skeleton and a diol component skeleton are mentioned.
  • 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.
  • polyethylene terephthalate is inexpensive, it can be used for a very wide range of applications, which is preferable.
  • 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.
  • 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.
  • 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.
  • the average length of the carbon nanotubes may be 1 to 500 ⁇ m, for example, 1 to 300 ⁇ m, for example 1 to 100 ⁇ m, and the maximum length of the carbon nanotubes is 500 May be ⁇ m.
  • 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.
  • 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.
  • 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. .
  • 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.
  • 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 ;
  • Molding the composite may be produced by a method comprising the step of producing an antistatic tray.
  • the carbon nanotubes may be prepared by catalytic chemical vapor deposition (CCVD).
  • CCVD catalytic chemical vapor deposition method
  • 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.
  • 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.
  • a metal compound as a catalyst support.
  • 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.
  • 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. .
  • 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.
  • Table 1 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.
  • a chopped fiber having a diameter of 1 to 30 ⁇ m 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 ⁇ m 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.
  • 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
  • the tensile strength was measured by the method according to ASTM D638.
  • the flexural strength was measured by a method according to ASTM D790.
  • the flexural modulus was measured by a method according to ASTM D790.
  • the impact strength was measured by a method according to ASTM D256.
  • the surface resistance was measured by the method according to ASTM D257.
  • the heat deflection temperature was measured by a method according to ASTM D648.
  • 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 .
  • both the heat distortion temperature is 130 °C 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.
  • 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.
  • the strength value it can be seen that the Example has a higher mechanical strength than the Comparative Example.
  • 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.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Composite Materials (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Packaging Frangible Articles (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente invention concerne un plateau antistatique fabriqué en utilisant un matériau composite, qui a une composition optimale améliorant la résistance mécanique et, simultanément, permettant de maintenir les caractéristiques électriques et l'aptitude au formage, ce qui lui confère ainsi d'excellentes propriétés de matériau telles que la résistance et une propriété antistatique.
PCT/KR2016/011642 2016-01-26 2016-10-17 Plateau antistatique et son procédé de fabrication WO2017131317A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2016-0009645 2016-01-26
KR1020160009645A KR102043314B1 (ko) 2016-01-26 2016-01-26 대전방지 트레이 및 그 제조방법

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CN112920586A (zh) * 2019-12-06 2021-06-08 汉达精密电子(昆山)有限公司 一种抗静电pc材料及其制品

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