CN112812517B - Chemical-resistant transparent PC material for NCL process and preparation method thereof - Google Patents
Chemical-resistant transparent PC material for NCL process and preparation method thereof Download PDFInfo
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K2003/324—Alkali metal phosphate
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- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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Abstract
The invention relates to the technical field of fast-elimination electronic materials, in particular to a chemical-resistant transparent PC material for an NCL (non-volatile memory) process and a preparation method thereof, wherein the chemical-resistant transparent PC material comprises the following raw materials in parts by weight: 15-30 parts of polycarbonate, 10-20 parts of silicon PC powder, 50-60 parts of poly terephthalic acid 1, 4-cyclohexane dimethanol ester, 0.1-1 part of ester exchange inhibitor, 0.1-1 part of anti-yellowing agent, 0.2-1 part of cross-linking agent, 0.1-0.5 part of antioxidant and 0.1-1 part of lubricant. Solves the problems that PC is not resistant to chemical cracking and the transparency of PC is low.
Description
Technical Field
The invention relates to the technical field of fast-elimination electronic materials, in particular to a chemical-resistant transparent PC material for an NCL (non-volatile memory) process and a preparation method thereof.
Background
The NCL (namely, the NCVM electroplating-Coating-Laser etching) process uses a high-grade polycarbonate material, NCVM high-molecular metal deposition is carried out in the deep part of a shell to form microscopic high-brightness texture, and then baking varnish with matte metal texture is attached to form the material of the mobile phone shell.
In the processing process of the NCL process, the transparent PC board is easily corroded or cracked due to the influence of chemicals, and if the chemical-resistant PC board is adopted, the transparency is greatly reduced, and the color forming of the PC board after the NCL process is influenced.
At present, materials resistant to chemical PC are available on the market, but few transparent PC materials can be used in the NCL process, and the difficulty is how to prevent the PC from being resistant to chemical cracking and ensure the transparency of the PC.
Disclosure of Invention
In order to overcome the disadvantages and shortcomings of the prior art, the present invention aims to provide a chemical-resistant transparent PC material for NCL process.
The invention also aims to provide a preparation method of the chemical-resistant transparent PC material for the NCL process, which has the advantages of simple operation, convenient control, high production efficiency and low production cost and can be used for large-scale production.
The purpose of the invention is realized by the following technical scheme: a chemical-resistant transparent PC material for an NCL process comprises the following raw materials in parts by weight:
according to the chemical-resistant transparent PC material for the NCL process, the polycarbonate and the 1, 4-cyclohexanedimethanol terephthalate are used as main resin, and the silicon PC powder, the ester exchange inhibitor, the yellowing-resistant agent, the cross-linking agent, the antioxidant and the lubricant are added for modification, so that the problems that the PC is not resistant to chemical cracking and the transparency of the PC is low are well solved, and the compatibility of the PC/PCT alloy material is improved and the transparency of the PC/PCT alloy material is kept through the synergistic effect of the cross-linking agent and the ester exchange inhibitor; the silicon PC powder is introduced to further improve the low-temperature impact resistance and the chemical resistance of the chemical-resistant transparent PC material and the thin-wall injection molding demoulding, and the silicon PC powder has excellent chemical-resistant cracking PCT compounding synergistic effect, so that the chemical-resistant cracking of the chemical-resistant transparent PC material is greatly increased, the PC can withstand the corrosion of chemicals in an NCL process to the chemical-resistant transparent PC material, the transparency of the material is greatly maintained, and the color of the PC treated by the NCL process is improved.
Preferably, the polycarbonate is a glassy transparent polycarbonate having a density of 1.18 to 1.22g/cm 3 And a melt index of 8 to 12g/10min at 300 ℃ under 1.2 kg.
By adopting the technical scheme, the optical quality is improved due to the glassy transparent characteristic, good heat resistance, cold resistance, high dimensional precision and stability are obtained, the processing is facilitated, and the defect of poor chemical resistance of polycarbonate is overcome under the synergistic action of the silicon PC powder and the poly 1, 4-cyclohexane dimethanol terephthalate under the synergistic action of a cross-linking agent and an ester exchange inhibitor, so that the chemical resistance and high transparency of the chemical-resistant transparent PC material are ensured. More preferably, the polycarbonate is selected from bayer PC-2800.
Preferably, the silicon PC powder is selected from at least one of TRIREXST6-3022PJ (1), FG1700 and ST6-3022PJ.
By adopting the technical scheme, the low-temperature impact resistance and the chemical resistance of the chemical-resistant transparent PC material and the thin-wall injection molding demoulding are better facilitated to be improved, the chemical-resistant transparent PC material and the PCT with excellent chemical-resistant cracking have a compounding synergistic effect, and the chemical-resistant cracking of the chemical-resistant transparent PC material is greatly increased.
Preferably, the density of the poly (1, 4-cyclohexanedimethanol terephthalate) is 1.4-1.5g/cm 3 And a melt index of 12 to 15g/10min at 260 ℃ under 3.8 kg.
By adopting the technical scheme, the composite material has high transparency and excellent processing performance, and after being compounded with PC, the chemical resistance and hydrolysis resistance of the composite material are effectively improved. More preferably, the poly (1, 4-cyclohexanedimethanol terephthalate) is PCT 3631.
Preferably, the transesterification inhibitor is at least one of disodium hydrogen phosphate, sodium dihydrogen phosphate, ethyl orthosilicate and disodium dihydrogen pyrophosphate.
By adopting the technical scheme, the ester exchange between the PC and the 1, 4-cyclohexanedimethanol terephthalate is inhibited, the physical property loss of the PC/PCT alloy is prevented, the impact strength, the elongation at break and the thermal stability of the system are improved, and the yellowing of the material is prevented under the combined action of the PC/PCT alloy and the yellowing-resistant agent.
Preferably, the anti-yellowing agent is a phosphorous acid aqueous solution with the concentration of 40-60 wt%.
By adopting the technical scheme, the material is prevented from yellowing under the combined action of the ester exchange inhibitor and the resin.
Preferably, the crosslinking agent is a styrene-acrylonitrile-glycidyl methacrylate terpolymer.
By adopting the technical scheme, the molecular weight of the polycarbonate is stabilized by matching with the ester exchange inhibitor, the molecular weight distribution range of the polycarbonate is concentrated, and the polycarbonate, the silicon PC powder and the PCT act together to be crosslinked in the melt extrusion process, so that the mechanical stability and the impact strength of the material are improved. More preferably, the styrene-acrylonitrile-glycidyl methacrylate terpolymer is selected from SAG-002 or SAG-005.
Preferably, the antioxidant is an antioxidant 1076; the lubricant is pentaerythritol stearate or ethylene bisstearamide.
The antioxidant is adopted to improve the oxidation resistance of the composite material, prevent the material from yellowing after overlong use time and improve the mechanical stability of the composite material. By adopting the lubricant, the fluidity of the composite material and the demolding performance of a product in the processing process can be improved, and the mixing torque and load are reduced, so that the thermal degradation of the composite material is prevented, the efficiency of dispersing the material is improved, the friction degree between the composite material and mechanical equipment in the preparation process can be reduced, the processing difficulty can be reduced, the extrusion processing is facilitated, and the energy consumption is reduced.
The other purpose of the invention is realized by the following technical scheme: the preparation method of the chemical-resistant transparent PC material for the NCL process comprises the following steps:
(S1) taking polycarbonate, silicon PC powder, poly (1, 4-cyclohexanedimethanol terephthalate), an ester exchange inhibitor, a yellowing resistant agent, a crosslinking agent, an antioxidant and a lubricant according to parts by weight for later use;
(S2) uniformly mixing the polycarbonate and the 1, 4-cyclohexanedimethanol terephthalate, and then adding the yellowing resistance agent to uniformly mix to obtain a premix;
and (S3) mixing the premix, the silicon PC powder, the ester exchange inhibitor, the cross-linking agent, the antioxidant and the lubricant, and then sending the mixture into a double-screw extruder for extrusion granulation to obtain the chemical-resistant transparent PC material.
According to the preparation method of the chemical-resistant transparent PC material for the NCL process, the PC and the PCT are blended and then the anti-yellowing agent is added, so that the mixing uniformity of the PC and the PCT and the dispersibility of the anti-yellowing agent are improved, and the reaction of the PC and the PCT in a double-screw extruder is promoted, so that the chemical-resistant and high-transparency PC material can be obtained; the preparation method has the advantages of simple operation, convenient control, high production efficiency and low production cost, and can be used for large-scale production.
Preferably, the length-diameter ratio of the screw of the double-screw extruder is 20-30, the rotating speed of the screw is 80-150r/min, and the temperatures of all the zones of the double-screw extruder are respectively as follows: the first zone is 250-255 ℃, the second zone is 255-260 ℃, the third zone is 250-260 ℃, the fourth zone is 260-265 ℃, the fifth zone is 265-270 ℃ and the sixth zone is 260-270 ℃.
By adopting the technical scheme, the temperature, the length-diameter ratio and the rotating speed of each zone in the double-screw extruder are controlled, so that the materials are fully reacted in the melt extrusion process, and the prepared PC material keeps excellent mechanical property, chemical resistance and high permeability and is not easy to turn yellow.
The invention has the beneficial effects that: according to the chemical-resistant transparent PC material for the NCL process, the polycarbonate and the 1, 4-cyclohexanedimethanol terephthalate are used as main resin, and the silicon PC powder, the ester exchange inhibitor, the yellowing-resistant agent, the cross-linking agent, the antioxidant and the lubricant are added for modification, so that the problems that the PC is not resistant to chemical cracking and the transparency of the PC is low are well solved, and the compatibility of the PC/PCT alloy material is improved and the transparency of the PC/PCT alloy material is kept through the synergistic effect of the cross-linking agent and the ester exchange inhibitor.
The preparation method disclosed by the invention is simple to operate, convenient to control, high in production efficiency and low in production cost, and can be used for large-scale production.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example 1
A chemical-resistant transparent PC material for an NCL process comprises the following raw materials in parts by weight:
the polycarbonate is transparent polycarbonate with glass shape, and the density of the polycarbonate is 1.2g/cm 3 And a melt index of 10g/10min at 300 ℃ under 1.2 kg.
The polycarbonate is selected from bayer PC-2800.
The silicon PC powder is selected from TRIREXST6-3022PJ (1).
The density of the poly (1, 4-cyclohexanedimethanol terephthalate) is 1.4.5g/cm 3 And a melt index of 13g/10min at 260 ℃ under 3.8 kg. The poly (1, 4-cyclohexane terephthalate)Alkyldimethanol esters are PCT 3631.
The ester exchange inhibitor is disodium hydrogen phosphate.
The anti-yellowing agent is a phosphorous acid aqueous solution with the concentration of 50 wt%.
The cross-linking agent is styrene-acrylonitrile-glycidyl methacrylate terpolymer SAG-002.
The antioxidant is an antioxidant 1076; the lubricant is pentaerythritol stearate.
The preparation method of the chemical-resistant transparent PC material for the NCL process comprises the following steps:
(S1) taking polycarbonate, silicon PC powder, poly (1, 4-cyclohexanedimethanol terephthalate), an ester exchange inhibitor, a yellowing resistant agent, a crosslinking agent, an antioxidant and a lubricant according to parts by weight for later use;
(S2) uniformly mixing the polycarbonate and the poly (1, 4-cyclohexanedimethanol terephthalate), adding the anti-yellowing agent, and uniformly mixing to obtain a premix;
and (S3) mixing the premix, the silicon PC powder, the ester exchange inhibitor, the cross-linking agent, the antioxidant and the lubricant, and then sending the mixture into a double-screw extruder for extrusion granulation to obtain the chemical-resistant transparent PC material.
The length-diameter ratio of a screw of the double-screw extruder is 25, the rotating speed of the screw is 100r/min, and the temperatures of all the zones of the double-screw extruder are respectively as follows: the first zone is 252 ℃, the second zone is 258 ℃, the third zone is 258 ℃, the fourth zone is 262 ℃, the fifth zone is 268 ℃ and the sixth zone is 262 ℃.
Example 2
A chemical-resistant transparent PC material for an NCL process comprises the following raw materials in parts by weight:
the polycarbonate is glassy transparent polycarbonate, and the density of the polycarbonate is 1.18g/cm 3 And a melt index of 8g/10min at 300 ℃ under 1.2 kg.
The polycarbonate is selected from bayer PC-2800.
The silicon PC powder is selected from ST6-3022PJ.
The density of the poly (1, 4-cyclohexanedimethanol terephthalate) is 1.4g/cm 3 And a melt index of 12g/10min at 260 ℃ under 3.8 kg. The poly (1, 4-cyclohexanedimethanol terephthalate) is PCT 3631.
The ester exchange inhibitor is sodium dihydrogen phosphate.
The anti-yellowing agent is a phosphorous acid aqueous solution with the concentration of 40 wt%.
The cross-linking agent is styrene-acrylonitrile-glycidyl methacrylate terpolymer SAG-005.
The antioxidant is an antioxidant 1076; the lubricant is ethylene bis stearamide.
The preparation method of the chemical-resistant transparent PC material for the NCL process comprises the following steps:
(S1) taking polycarbonate, silicon PC powder, poly (1, 4-cyclohexanedimethanol terephthalate), an ester exchange inhibitor, a yellowing resistant agent, a crosslinking agent, an antioxidant and a lubricant according to parts by weight for later use;
(S2) uniformly mixing the polycarbonate and the 1, 4-cyclohexanedimethanol terephthalate, and then adding the yellowing resistance agent to uniformly mix to obtain a premix;
and (S3) mixing the premix, the silicon PC powder, the ester exchange inhibitor, the cross-linking agent, the antioxidant and the lubricant, and then conveying the mixture into a double-screw extruder for extrusion granulation to obtain the chemical-resistant transparent PC material.
The length-diameter ratio of a screw of the double-screw extruder is 20, the rotating speed of the screw is 80r/min, and the temperatures of all the zones of the double-screw extruder are respectively as follows: the first zone is 250 ℃, the second zone is 255 ℃, the third zone is 250 ℃, the fourth zone is 260 ℃, the fifth zone is 265 ℃ and the sixth zone is 260 ℃.
Example 3
A chemical-resistant transparent PC material for an NCL process comprises the following raw materials in parts by weight:
the polycarbonate is glassy transparent polycarbonate, and the density of the polycarbonate is 1.22g/cm 3 And a melt index of 12g/10min at 300 ℃ under 1.2 kg.
The polycarbonate is selected from bayer PC-2800.
The silicon PC powder is selected from FG1700.
The density of the poly (1, 4-cyclohexanedimethanol terephthalate) is 1.5g/cm 3 And a melt index of 15g/10min under the conditions of 260 ℃ and 3.8 kg. The poly (1, 4-cyclohexanedimethanol terephthalate) is PCT 3631.
The ester exchange inhibitor is tetraethoxysilane.
The anti-yellowing agent is a phosphorous acid aqueous solution with the concentration of 60 wt%.
The cross-linking agent is styrene-acrylonitrile-glycidyl methacrylate terpolymer SAG-002.
The antioxidant is an antioxidant 1076; the lubricant is ethylene bisstearamide.
The preparation method of the chemical-resistant transparent PC material for the NCL process comprises the following steps:
(S1) taking polycarbonate, silicon PC powder, poly (1, 4-cyclohexanedimethanol terephthalate), an ester exchange inhibitor, a yellowing resistant agent, a crosslinking agent, an antioxidant and a lubricant according to parts by weight for later use;
(S2) uniformly mixing the polycarbonate and the 1, 4-cyclohexanedimethanol terephthalate, and then adding the yellowing resistance agent to uniformly mix to obtain a premix;
and (S3) mixing the premix, the silicon PC powder, the ester exchange inhibitor, the cross-linking agent, the antioxidant and the lubricant, and then sending the mixture into a double-screw extruder for extrusion granulation to obtain the chemical-resistant transparent PC material.
The length-diameter ratio of a screw of the double-screw extruder is 30, the rotating speed of the screw is 150r/min, and the temperatures of all zones of the double-screw extruder are respectively as follows: 255 ℃ in the first zone, 260 ℃ in the second zone, 260 ℃ in the third zone, 265 ℃ in the fourth zone, 270 ℃ in the fifth zone and 270 ℃ in the sixth zone.
Example 4
A chemical-resistant transparent PC material for an NCL process comprises the following raw materials in parts by weight:
the polycarbonate is glassy transparent polycarbonate, and the density of the polycarbonate is 1.20g/cm 3 And a melt index of 11g/10min at 300 ℃ under 1.2 kg.
The polycarbonate is selected from bayer PC-2800.
The silicon PC powder is selected from TRIREXST6-3022PJ (1).
The density of the poly (1, 4-cyclohexanedimethanol terephthalate) is 1.48g/cm 3 And a melt index of 14g/10min at 260 ℃ under 3.8 kg. The poly (1, 4-cyclohexanedimethanol terephthalate) is PCT 3631.
The ester exchange inhibitor is disodium dihydrogen pyrophosphate.
The anti-yellowing agent is a phosphorous acid aqueous solution with the concentration of 48 wt%.
The cross-linking agent is styrene-acrylonitrile-glycidyl methacrylate terpolymer SAG-002.
The antioxidant is an antioxidant 1076; the lubricant is pentaerythritol stearate.
The preparation method of the chemical-resistant transparent PC material for the NCL process comprises the following steps:
(S1) taking polycarbonate, silicon PC powder, poly (1, 4-cyclohexanedimethanol terephthalate), an ester exchange inhibitor, a yellowing resistant agent, a crosslinking agent, an antioxidant and a lubricant according to parts by weight for later use;
(S2) uniformly mixing the polycarbonate and the 1, 4-cyclohexanedimethanol terephthalate, and then adding the yellowing resistance agent to uniformly mix to obtain a premix;
and (S3) mixing the premix, the silicon PC powder, the ester exchange inhibitor, the cross-linking agent, the antioxidant and the lubricant, and then sending the mixture into a double-screw extruder for extrusion granulation to obtain the chemical-resistant transparent PC material.
The length-diameter ratio of a screw of the double-screw extruder is 28, the rotating speed of the screw is 120r/min, and the temperatures of all zones of the double-screw extruder are respectively as follows: 252 ℃ in the first zone, 256 ℃ in the second zone, 254 ℃ in the third zone, 262 ℃ in the fourth zone, 269 ℃ in the fifth zone and 262 ℃ in the sixth zone.
Comparative example 1
This comparative example differs from example 1 in that: the chemical-resistant transparent PC material does not contain silicon PC powder.
Comparative example 2
This comparative example differs from example 1 in that: the chemically resistant transparent PC material is free of a crosslinking agent.
Comparative example 3
This comparative example differs from example 1 in that: the cross-linking agent is dicumyl peroxide.
Comparative example 4
This comparative example differs from example 1 in that: the ester exchange inhibitor is trimethyl phosphate.
Example 5
The chemical-resistant transparent PC materials of examples 1-4 and comparative examples 1-4 were tested for transmittance, chemical resistance, melt viscosity, tensile strength, impact strength, and elongation at break by the following methods:
transmittance: the test is carried out according to GB/T2410-2008, and the test unit is%.
Chemical resistance test: and (4) testing according to GB/T11547-2008, soaking the sample for 15min, taking out the sample with anhydrous glacial acetic acid as a medium, and observing the cracking condition of the sample.
Melt viscosity: the test was carried out at a temperature of 300 ℃ under a load of 1.2KG in accordance with ASTM D1238, and the unit is g/10min.
Tensile strength: testing according to GB/T1040.2-2006, wherein the testing speed is as follows: 50mm/min in MPa.
Impact strength: the test is carried out according to GB/T1843-2008, the sample is an A-type notch sample, the pendulum energy is 5.5J, and the unit is kJ/m 2 。
Elongation at break: testing is carried out according to GB/T1040.2-2006, and the testing speed is as follows: 50mm/min in%.
The test results are shown in the following table:
| transmittance of light | Chemical resistance | Melt viscosity | Tensile strength | Impact strength | Elongation at break | |
| Example 1 | 75 | Without significant cracking | 35 | 58 | 13 | 145 |
| Example 2 | 70 | Without significant cracking | 30 | 55 | 10 | 130 |
| Example 3 | 79 | Without obvious cracking | 40 | 60 | 15 | 160 |
| Example 4 | 74 | Without significant cracking | 36 | 56 | 11 | 153 |
| Comparative example 1 | 73 | 2 apparent cracking | 28 | 51 | 7 | 122 |
| Comparative example 2 | 81 | 5 obvious cracking | 21 | 37 | 6 | 110 |
| Comparative example 3 | 65 | 2 apparent cracking | 34 | 53 | 9 | 132 |
| Comparative example 4 | 38 | Without obvious cracking | 31 | 55 | 10 | 138 |
As can be seen from the above table, the invention adopts specific silicon PC powder, ester exchange inhibitor and cross-linking agent, and has unexpected technical effect on solving the problems that PC is not resistant to chemical cracking and PC is low in transparency. According to the chemical-resistant transparent PC material for the NCL process, the polycarbonate and the 1, 4-cyclohexanedimethanol terephthalate are used as main resin, and the silicon PC powder, the ester exchange inhibitor, the yellowing-resistant agent, the cross-linking agent, the antioxidant and the lubricant are added for modification, so that the problems that the PC is not resistant to chemical cracking and the transparency of the PC is low are well solved, and the compatibility of the PC/PCT alloy material is improved and the transparency of the PC/PCT alloy material is kept through the synergistic effect of the cross-linking agent and the ester exchange inhibitor.
The above-described embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.
Claims (5)
1. A chemical-resistant transparent PC material for an NCL process is characterized by comprising the following raw materials in parts by weight:
the ester exchange inhibitor is at least one of disodium hydrogen phosphate, sodium dihydrogen phosphate, ethyl orthosilicate and disodium dihydrogen pyrophosphate;
the cross-linking agent is styrene-acrylonitrile-glycidyl methacrylate terpolymer;
the silicon PC powder is at least one of TRIREXST6-3022PJ (1), FG1700 and ST6-3022 PJ;
the density of the poly (1, 4-cyclohexanedimethanol terephthalate) is 1.4-1.5g/cm 3 And a melt index of 12-15g/10min at 260 ℃ under 3.8 kg;
the antioxidant is an antioxidant 1076; the lubricant is pentaerythritol stearate or ethylene bisstearylamide.
2. A chemical resistant transparent PC material for NCL process according to claim 1, characterized in that: the polycarbonate is glassy transparent polycarbonate, and the density of the polycarbonate is 1.18-1.22g/cm 3 And a melt index of 8 to 12g/10min at 300 ℃ under 1.2 kg.
3. A chemical resistant transparent PC material for NCL process according to claim 1, characterized in that: the anti-yellowing agent is a phosphorous acid aqueous solution with the concentration of 40-60 wt%.
4. A method for the preparation of chemical resistant transparent PC material for NCL process according to any of claims 1-3, characterized in that it comprises the following steps:
(S1) taking polycarbonate, silicon PC powder, poly (1, 4-cyclohexanedimethanol terephthalate), an ester exchange inhibitor, a yellowing resistant agent, a crosslinking agent, an antioxidant and a lubricant according to parts by weight for later use;
(S2) uniformly mixing the polycarbonate and the 1, 4-cyclohexanedimethanol terephthalate, and then adding the yellowing resistance agent to uniformly mix to obtain a premix;
and (S3) mixing the premix, the silicon PC powder, the ester exchange inhibitor, the cross-linking agent, the antioxidant and the lubricant, and then sending the mixture into a double-screw extruder for extrusion granulation to obtain the chemical-resistant transparent PC material.
5. The method of claim 4 for preparing chemical resistant transparent PC material used in NCL process, wherein the method comprises the following steps: the length-diameter ratio of a screw of the double-screw extruder is 20-30, the screw rotating speed is 80-150r/min, and the temperatures of all zones of the double-screw extruder are respectively as follows: the first zone is 250-255 ℃, the second zone is 255-260 ℃, the third zone is 250-260 ℃, the fourth zone is 260-265 ℃, the fifth zone is 265-270 ℃ and the sixth zone is 260-270 ℃.
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| CN103333479A (en) * | 2013-07-16 | 2013-10-02 | 东莞市信诺橡塑工业有限公司 | Polycarbonate composition capable of being formed at low temperature and preparation method of polycarbonate composition |
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