Flame-retardant chemical-resistant dimensionally stable pc composite and method of making same

Abstract

The application discloses a kind of flame-retardant chemical resistance dimensional stability PC composite material and preparation method thereof, flame-retardant chemical resistance dimensional stability PC composite material is by weight fraction, including PC 40-75 parts, PET 10-20 parts, PCTG 10-30 parts;Preparation method is: after being mixed uniformly according to proportion, from the main feeding port of twin-screw extruder, melt extrusion, obtain flame-retardant chemical resistance dimensional stability PC composite material.The preparation method of the application is simple, and the PC composite material prepared has excellent chemical resistance, low shrinkage, dimensional stability and the like characteristics, and can be used in the field of control panel of large medical equipment and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high polymer materials, and relates to a flame-retardant and chemical-resistant size-stable PC composite material and a preparation method thereof. BACKGROUND

[0002] PC (polycarbonate) is a non-crystalline thermoplastic engineering plastic with excellent performance. Due to its special molecular structure, flexible ester groups and rigid benzene rings in the molecular chain are alternately arranged, so that the PC has excellent impact toughness, high heat distortion temperature, good flame retardancy and electrical insulation, and many other advantages, and has excellent transparency, and is widely used in the market. It is the engineering plastic with the fastest application growth rate in recent years. The disadvantage of PC is poor chemical resistance. Technically, the problem of poor chemical resistance can be improved by adding PET (polyethylene terephthalate) or PBT (polybutylene terephthalate), but the crystallization of PET or PBT will cause the shrinkage of the PC composite material to increase, and the size of the injection-molded product is unstable.

[0003] Patent CN105838051A proposes to improve the warping and size stability of PC / PET alloy by adding talc, but the size stability effect of talc in the PC alloy system is not obvious. SUMMARY

[0004] The purpose of the application is to solve the above-mentioned problems in the prior art, and provide a flame-retardant and chemical-resistant size-stable PC composite material and a preparation method thereof.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the application is as follows:

[0006] A flame-retardant and chemical-resistant size-stable PC composite material, by weight, comprises PC 40-75 parts, PET 10-20 parts, and PCTG 10-30 parts.

[0007] PCTG is a terpolymer of terephthalic acid, ethylene glycol and cyclohexane dimethanol (CHDM), which is obtained by replacing part of ethylene glycol with cyclohexane dimethanol based on PET. The cyclohexane dimethanol prevents the crystallization of the terpolymer, so that the PCTG has good size stability and chemical resistance.

[0008] The application selects PET as the main chemical resistance improver of PC. The rigid polar groups in the molecular structure of PET make its crystallization speed slow, and the molecules in the crystal are closely arranged, so that the PET has good chemical resistance. Meanwhile, the application selects PCTG as the auxiliary chemical resistance improver of PC. The PCTG has a very dense molecular structure, and its chemical resistance is better than that of PC.

[0009] The introduction of PCTG can also solve the problem of increased shrinkage of PC caused by the crystallization of PET, because PCTG can act as a dimensional stabilizer, PCTG has good compatibility with PET, the structure of cyclohexane dimethanol in PCTG can inhibit the crystallization of PET, reduce the crystallinity of PET, reduce the shrinkage of the composite material, and increase the dimensional stability; PCTG has a dense molecular structure and low shrinkage, which can also reduce the shrinkage of the composite material.

[0010] In addition, the present application controls the proportion of PET and PCTG in the chemical resistance modifier to be moderate, because if the proportion of PET is too large, the crystallization inhibition of PCTG will be limited, the crystallization proportion in the composite material will be high, the shrinkage will be large, and the product size will be unstable, and if the proportion of PCTG is too large, the rigidity and heat resistance of the composite material will be insufficient, affecting the functionality of the product.

[0011] As a preferred technical solution:

[0012] The flame-retardant and chemically-resistant dimensional stable PC composite material described above has a melt index of 5-25 g / 10 min at 300℃ under 1.2 kg.

[0013] The flame-retardant and chemically-resistant dimensional stable PC composite material described above has a specific viscosity of 0.8-0.9 dL / g.

[0014] The flame-retardant and chemically-resistant dimensional stable PC composite material described above has a specific viscosity of 0.7-0.8 dL / g.

[0015] The flame-retardant and chemically-resistant dimensional stable PC composite material described above further comprises 5-10 parts by weight of a flame retardant and 0.5-1 part of an ester exchange inhibitor.

[0016] The flame-retardant and chemically-resistant dimensional stable PC composite material described above has a specific viscosity of 0.7-0.8 dL / g.

[0017] The epoxy groups at the molecular chain ends of the brominated epoxy resin and the styrene grafted glycidyl methacrylate can react with the hydroxyl groups at the molecular chain ends of PC, PET and PCTG to form stable ether groups, preventing ester exchange reactions between the three, and reducing the performance of the composite material.

[0018] The flame-retardant and chemically-resistant dimensional stable PC composite material described above further comprises 2-5 parts by weight of a compatibilizer and 0.5-1 part of an auxiliary.

[0019] The flame-retardant and chemical-resistant dimensionally stable PC composite material as described above, wherein the compatilizer is a terpolymer of methyl methacrylate-butadiene-styrene, and the auxiliary agent is an antioxidant and / or a lubricant.

[0020] The flame-retardant and chemical-resistant dimensionally stable PC composite material as described above, wherein the flame-retardant and chemical-resistant dimensionally stable PC composite material has a tensile strength of 46.2-56.9 MPa, a bending strength of 68.5-77.3 MPa, a bending modulus of 1920-2218 MPa, a notched impact strength of 257-691 J / m, a heat distortion temperature of 84.2-95.3℃, a flame retardant rating of 1.6 mm V2, a shrinkage in the flow direction of 0.51-0.55%, and a shrinkage perpendicular to the flow direction of 0.52-0.57%.

[0021] The application further provides a method for preparing the flame-retardant and chemical-resistant dimensionally stable PC composite material as described above, wherein the components are mixed according to the ratio, and then added from the main feeding port of a twin-screw extruder for melt extrusion to obtain the flame-retardant and chemical-resistant dimensionally stable PC composite material.

[0022] As a preferred technical solution,

[0023] The method as described above, wherein the rotating speed of the twin-screw extruder is 350-400 rpm, and the temperature is 230-240℃.

[0024] Beneficial effects:

[0025] The preparation method is simple, and the flame-retardant and chemical-resistant dimensionally stable PC composite material prepared has excellent flame retardancy, chemical resistance and dimensional stability. DETAILED DESCRIPTION

[0026] The application will be further described in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate but not to limit the scope of the application. Furthermore, it should be understood that those skilled in the art can make various modifications or changes to the application after reading the content of the application, and these equivalent forms also fall within the scope of the appended claims.

[0027] The following are the test methods for the properties in the examples and comparative examples:

[0028] Melt index: detected according to ISO 1133.

[0029] Intrinsic viscosity: detected according to ISO 1628.

[0030] The composite material prepared in the examples or comparative examples was dried in a blast oven at 90℃ for 4 hours or more, and was injection molded into a standard bar using an injection molding machine (model UN120SKII-V). The injection molded standard bar was left to stand at 50% relative humidity and 23℃ for at least 24 hours, and then the following tests were performed:

[0031] Tensile strength: tested in accordance with the method of ASTM D638, wherein the tensile speed was 50 mm / min.

[0032] Flexural strength and flexural modulus: tested in accordance with the method of ASTM D790, wherein the test speed was 2 mm / min.

[0033] Notched impact strength: tested in accordance with the method of ASTM D256, wherein the notch type was type A notch, and the pendulum energy was 2.75 J.

[0034] Heat distortion temperature: tested in accordance with the method of ASTM D648, wherein the pressure load was 0.46 MPa, and the temperature increase rate was 120℃ / h.

[0035] Flame retardant grade: tested in accordance with the method of UL94.

[0036] Shrinkage: tested in accordance with the method of ASTM D955.

[0037] Chemical resistance: medical benzalkonium chloride disinfectant (manufacturer: Guangdong Luosite Pharmaceutical Co., Ltd.) was uniformly applied to the surface of an ASTM standard tensile bar, and the degree of cracking on the surface of the bar was observed after 14 days.

[0038] Example 1

[0039] A method for preparing a flame-retardant, chemical-resistant, and dimensionally stable PC composite material, and the specific steps are as follows:

[0040] (1) Preparation of raw materials;

[0041] PC: manufacturer: Covestro, Germany, brand: PC2805, melt index: 10 g / 10 min;

[0042] PET: manufacturer: Sinopec Yizheng Chemical Fibre Co., Ltd., China, brand: BG85, intrinsic viscosity: 0.88 dL / g;

[0043] PCTG: manufacturer: SK, Korea, brand: JN200, intrinsic viscosity: 0.75 dL / g;

[0044] Flame retardant: brominated epoxy resin, manufacturer: Iscor Chemicals, Israel, brand: F-3100;

[0045] Ester exchange inhibitor: styrene grafted glycidyl methacrylate, manufacturer is Jiaoyironghe Congnianjishu Jiangsu Co., Ltd., and the model is SAG002;

[0046] Compatibility agent: terpolymer of methyl methacrylate-butadiene-styrene, manufacturer is Zhongyuan Chemical Industry Co., Ltd., and the model is M722;

[0047] Antioxidant 1076: manufacturer is BASF, Germany;

[0048] Antioxidant S-9228: manufacturer is DuPont Group, USA;

[0049] Lubricant: manufacturer is Fargi Co., Ltd., Italy, and the model is AHS;

[0050] (2) 40 parts of PC, 20 parts of PET, 30 parts of PCTG, 10 parts of flame retardant, 1 part of ester exchange inhibitor, 4 parts of compatibility agent, 0.2 parts of antioxidant 1076, 0.2 parts of antioxidant S-9228 and 0.6 parts of lubricant were uniformly mixed, and then were added from the main feeding port of the twin-screw extruder to obtain a flame-retardant and chemical-resistant dimensionally stable PC composite material by melt extrusion;

[0051] The rotation speed of the twin-screw extruder was 350 rpm, the temperature of the first zone was 230℃, the temperature of the second zone was 235℃, the temperature of the third zone was 240℃, the temperature of the fourth zone was 240℃, the temperature of the fifth zone was 240℃, the temperature of the sixth zone was 240℃, the temperature of the seventh zone was 240℃, the temperature of the eighth zone was 240℃, the temperature of the ninth zone was 235℃, and the temperature of the tenth zone was 235℃.

[0052] The tensile strength of the finally obtained flame-retardant and chemical-resistant dimensionally stable PC composite material was 54.1 MPa, the bending strength was 75 MPa, the bending modulus was 2125 MPa, the notched impact strength was 686 J / m, the heat distortion temperature was 93.2℃, the flame retardant level was 1.6 mm V2, the shrinkage in the flow direction was 0.52%, the shrinkage perpendicular to the flow direction was 0.53%, the sample was intact after the chemical resistance test, and no cracking occurred.

[0053] Comparative Example 1

[0054] A method for preparing a PC composite material, which is basically the same as Example 1, except that the PCTG is replaced by an equal weight of talc (manufacturer is Suzhou Youmin Plastics New Material Co., Ltd., and the model is T-2).

[0055] The tensile strength of the finally prepared PC composite material is 55.4 MPa, the bending strength is 81 MPa, the bending modulus is 2430 MPa, the notched impact strength is 123 J / m, the heat distortion temperature is 93.5 ℃, the flame retardant level is 1.6 mm V2, the shrinkage in the flow direction is 0.72%, the shrinkage perpendicular to the flow direction is 0.81%, and the sample bar has a small crack after the chemical resistance test.

[0056] As compared with Comparative Example 1 and Example 1, it can be seen that the toughness of the PC composite material of Comparative Example 1 is poor, and the shrinkage is significantly increased, and the chemical resistance is slightly decreased, because the addition of inorganic talc powder makes the composite material brittle, and the small particle size of talc powder has little effect on the shrinkage of the material, and the absence of PCTG leads to a slight decrease in the chemical resistance of the material.

[0057] Comparative Example 2

[0058] A method for preparing a PC composite material, which is basically the same as Example 1, except that in step (2), the addition amount of PET is 30 parts, and the addition amount of PCTG is 20 parts.

[0059] The tensile strength of the finally prepared PC composite material is 56.9 MPa, the bending strength is 77.8 MPa, the bending modulus is 2250 MPa, the notched impact strength is 543 J / m, the heat distortion temperature is 97.5 ℃, the flame retardant level is 1.6 mm V2, the shrinkage in the flow direction is 0.63%, the shrinkage perpendicular to the flow direction is 0.71%, and the sample bar is intact without cracking after the chemical resistance test.

[0060] As compared with Comparative Example 2 and Example 1, it can be seen that the strength and rigidity of the PC composite material of Comparative Example 2 are improved, the toughness is decreased to a certain extent, and the shrinkage is large, because the addition proportion of PET is too high, the crystallization proportion in the PC composite material is increased, the rigidity of the composite material is high, the toughness is low, and the shrinkage is large.

[0061] Comparative Example 3

[0062] A method for preparing a PC composite material, which is basically the same as Example 1, except that in step (2), the addition amount of PET is 10 parts, and the addition amount of PCTG is 40 parts.

[0063] The tensile strength of the finally prepared PC composite material is 42.5 MPa, the bending strength is 62.4 MPa, the bending modulus is 1852 MPa, the notched impact strength is 652 J / m, the heat distortion temperature is 82.7 ℃, the flame retardant level is 1.6 mm V2, the shrinkage in the flow direction is 0.48%, the shrinkage perpendicular to the flow direction is 0.49%, and the sample bar is intact without cracking after the chemical resistance test.

[0064] Comparative Example 3 and Example 1, the rigidity and heat resistance of the PC composite material of Comparative Example 3 decreased obviously, the shrinkage was lower, and the size was more stable, because the proportion of PCTG was too high, the crystallization of PET was obviously inhibited, the crystallization proportion decreased obviously, the size of the composite material was more stable, but the rigidity and heat resistance of PCTG itself were lower, and the rigidity and heat resistance of the material were reduced.

[0065] Example 2

[0066] A preparation method of a flame-retardant and chemical-resistant size-stable PC composite material, which is basically the same as that of Example 1, except that the flame retardant in step (1) is brominated polystyrene (manufacturer is Shandong Brothers Science and Technology Company, and the brand is BPS XZ 6700).

[0067] The tensile strength of the finally prepared flame-retardant and chemical-resistant size-stable PC composite material is 50.3 MPa, the bending strength is 74.2 MPa, the bending modulus is 2210 MPa, the notched impact strength is 532 J / m, the heat distortion temperature is 90.1 ℃, the flame retardant grade is 1.6 mm V2, the shrinkage in the flow direction is 0.52%, the shrinkage perpendicular to the flow direction is 0.53%, and the sample is intact after the chemical resistance test without cracking.

[0068] Comparative Example 2 and Example 1, the comprehensive performance of the flame-retardant and chemical-resistant size-stable PC composite material of Example 2 has certain decline, especially the impact toughness has obvious decrease, because the brominated epoxy resin is replaced by brominated polystyrene, the brominated polystyrene has no group to inhibit the ester exchange reaction, resulting in the decrease of the material performance.

[0069] Example 3

[0070] A preparation method of a flame-retardant and chemical-resistant size-stable PC composite material, which is basically the same as that of Example 1, except that no ester exchange inhibitor is prepared in step (1), and no ester exchange inhibitor is added in step (2).

[0071] The tensile strength of the finally prepared flame-retardant and chemical-resistant size-stable PC composite material is 46.2 MPa, the bending strength is 68.5 MPa, the bending modulus is 1920 MPa, the notched impact strength is 257 J / m, the heat distortion temperature is 84.2 ℃, the flame retardant grade is 1.6 mm V2, the shrinkage in the flow direction is 0.53%, the shrinkage perpendicular to the flow direction is 0.53%, and the sample is intact after the chemical resistance test without cracking.

[0072] Comparative Example 3 and Example 1, the performance of the flame-retardant chemical-resistant and dimensionally stable PC composite material of Example 1 (especially the notched impact strength) is superior to that of Example 3, because the ester exchange inhibitor added in Example 1 contains a large amount of epoxy groups, which can protect the terminal hydroxyl groups of PC, PET and PCTG, while no ester exchange inhibitor is added in Example 3, which cannot inhibit the ester exchange reaction between the polyesters, the resin degrades seriously, and the comprehensive performance of the composite material is obviously reduced.

[0073] Example 4

[0074] A preparation method of a flame-retardant chemical-resistant and dimensionally stable PC composite material, the specific steps are as follows:

[0075] (1) Preparation of raw materials;

[0076] PC: the manufacturer is Covestro, the brand is PC2805, and the melt index is 10 g / 10 min;

[0077] PET: the manufacturer is Sinopec Yizheng Chemical Fibre Co., Ltd., the brand is BG85, and the intrinsic viscosity is 0.88 dL / g;

[0078] PCTG: the manufacturer is SK Corporation, the brand is JN200, and the intrinsic viscosity is 0.75 dL / g;

[0079] Flame retardant: brominated epoxy resin, the manufacturer is Israyel Chemical Corporation, and the brand is F-3100;

[0080] Ester exchange inhibitor: styrene grafted glycidyl methacrylate, the manufacturer is Jiangsu Jia Yixing Compatibilizer Co., Ltd., and the brand is SAG002;

[0081] Compatibilizer: methyl methacrylate-butadiene-styrene terpolymer, the manufacturer is Japan Zhong Yuan Chemical Industry Co., Ltd., and the brand is M722;

[0082] Antioxidant 1076: the manufacturer is BASF;

[0083] Antioxidant S-9228: the manufacturer is Dow Group;

[0084] Lubricant: the manufacturer is Italy Fagioli Co., Ltd., and the brand is AHS;

[0085] (2) 75 parts of PC, 10 parts of PET, 10 parts of PCTG, 5 parts of flame retardant, 0.5 parts of ester exchange inhibitor, 2 parts of compatibilizer, 0.2 parts of antioxidant 1076, 0.1 parts of antioxidant S-9228 and 0.2 parts of lubricant are mixed uniformly, and then added from the main feeding port of the twin-screw extruder for melt extrusion to obtain a flame-retardant chemical-resistant and dimensionally stable PC composite material.

[0086] The twin-screw extruder operates at a speed of 360 rpm, with temperatures of 230℃ in zone 1, 235℃ in zone 2, 240℃ in zone 3, 240℃ in zone 4, 240℃ in zone 5, 240℃ in zone 6, 240℃ in zone 7, 240℃ in zone 8, 235℃ in zone 9, and 235℃ in zone 10.

[0087] The final flame-retardant, chemically resistant, and dimensionally stable PC composite material exhibits a tensile strength of 54.6 MPa, a flexural strength of 74.8 MPa, a flexural modulus of 2117 MPa, a notched impact strength of 584 J / m, a heat distortion temperature of 92.8℃, a flame retardancy rating of 1.6 mm V2, a shrinkage rate of 0.54% in the flow direction, and a shrinkage rate of 0.55% perpendicular to the flow direction. After chemical resistance testing, the specimens remained intact without cracking.

[0088] Example 5

[0089] A method for preparing a flame-retardant, chemically resistant, and dimensionally stable PC composite material, comprising the following specific steps:

[0090] (1) Preparation of raw materials;

[0091] PC: Manufacturer is Covestro AG, Germany; grade is PC2805; melt flow index is 10g / 10min.

[0092] PET: Manufacturer is Sinopec Yizheng Chemical Fiber Co., Ltd., grade is BG85, intrinsic viscosity is 0.88 dL / g;

[0093] PCTG: Manufacturer is SK Corporation of South Korea, grade is JN200, intrinsic viscosity is 0.75 dL / g;

[0094] Flame retardant: Brominated epoxy resin, manufactured by Israel Chemicals, brand name F-3100;

[0095] Ester exchange inhibitor: Styrene-grafted glycidyl methacrylate, manufactured by Jia Yi Rong Compatibilizer Jiangsu Co., Ltd., brand name SAG002;

[0096] Compatibilizer: methyl methacrylate-butadiene-styrene terpolymer, manufactured by Kaneka Corporation of Japan, brand name M722;

[0097] Antioxidant 1076: Manufacturer is BASF, Germany;

[0098] Antioxidant S-9228: Manufacturer is Dover Corporation, USA;

[0099] Lubricant: Manufacturer is Italian company Fagi S.A., brand name is AHS;

[0100] (2) By weight, 62 parts PC, 10 parts PET, 20 parts PCTG, 8 parts flame retardant, 0.8 parts transesterification inhibitor, 5 parts compatibilizer, 0.2 parts antioxidant 1076, 0.2 parts antioxidant S-9228 and 0.4 parts lubricant are mixed evenly and added from the main feed port of a twin-screw extruder and melt-extruded to obtain a flame-retardant, chemically resistant, and dimensionally stable PC composite material.

[0101] The twin-screw extruder operates at a speed of 370 rpm, with temperatures of 230℃ in zone 1, 235℃ in zone 2, 240℃ in zone 3, 240℃ in zone 4, 240℃ in zone 5, 240℃ in zone 6, 240℃ in zone 7, 240℃ in zone 8, 235℃ in zone 9, and 235℃ in zone 10.

[0102] The final flame-retardant, chemically resistant, and dimensionally stable PC composite material exhibits a tensile strength of 53.3 MPa, a flexural strength of 73.9 MPa, a flexural modulus of 2084 MPa, a notched impact strength of 691 J / m, a heat distortion temperature of 92.1℃, a flame retardancy rating of 1.6 mm V2, a shrinkage rate of 0.51% in the flow direction, and a shrinkage rate of 0.52% perpendicular to the flow direction. After chemical resistance testing, the specimen remained intact without cracking.

[0103] Example 6

[0104] A method for preparing a flame-retardant, chemically resistant, and dimensionally stable PC composite material, comprising the following specific steps:

[0105] (1) Preparation of raw materials;

[0106] PC: Manufacturer is Covestro AG, Germany; grade is PC2805; melt flow index is 10g / 10min.

[0107] PET: Manufacturer is Sinopec Yizheng Chemical Fiber Co., Ltd., grade is BG85, intrinsic viscosity is 0.88 dL / g;

[0108] PCTG: Manufacturer is SK Corporation of South Korea, grade is JN200, intrinsic viscosity is 0.75 dL / g;

[0109] Flame retardant: Brominated epoxy resin, manufactured by Israel Chemicals, brand name F-3100;

[0110] Ester exchange inhibitor: Styrene-grafted glycidyl methacrylate, manufactured by Jia Yi Rong Compatibilizer Jiangsu Co., Ltd., brand name SAG002;

[0111] Compatibilizer: methyl methacrylate-butadiene-styrene terpolymer, manufactured by Kaneka Corporation of Japan, brand name M722;

[0112] Antioxidant 1076: Manufacturer is BASF, Germany;

[0113] Antioxidant S-9228: Manufacturer is Dover Corporation, USA;

[0114] Lubricant: Manufacturer is Italian company Fagi S.A., brand name is AHS;

[0115] (2) By weight, 65 parts PC, 15 parts PET, 15 parts PCTG, 5 parts flame retardant, 0.6 parts transesterification inhibitor, 3 parts compatibilizer, 0.1 parts antioxidant 1076, 0.2 parts antioxidant S-9228 and 0.3 parts lubricant are mixed evenly and added from the main feed port of a twin-screw extruder and melt-extruded to obtain a flame-retardant, chemically resistant, dimensionally stable PC composite material;

[0116] The twin-screw extruder operates at a speed of 390 rpm, with temperatures of 230℃ in zone 1, 235℃ in zone 2, 240℃ in zone 3, 240℃ in zone 4, 240℃ in zone 5, 240℃ in zone 6, 240℃ in zone 7, 240℃ in zone 8, 235℃ in zone 9, and 235℃ in zone 10.

[0117] The final flame-retardant, chemically resistant, and dimensionally stable PC composite material exhibits a tensile strength of 56.9 MPa, a flexural strength of 77.3 MPa, a flexural modulus of 2218 MPa, a notched impact strength of 603 J / m, a heat distortion temperature of 95.3℃, a flame retardancy rating of 1.6 mm V2, a shrinkage rate of 0.55% in the flow direction, and a shrinkage rate of 0.57% perpendicular to the flow direction. After chemical resistance testing, the specimen remained intact without cracking.

[0118] Example 7

[0119] A method for preparing a flame-retardant, chemically resistant, and dimensionally stable PC composite material, comprising the following specific steps:

[0120] (1) Preparation of raw materials;

[0121] PC: Manufacturer is Covestro AG, Germany; grade is PC2805; melt flow index is 10g / 10min.

[0122] PET: Manufacturer is Sinopec Yizheng Chemical Fiber Co., Ltd., grade is BG85, intrinsic viscosity is 0.88 dL / g;

[0123] PCTG: Manufacturer is SK Corporation of South Korea, grade is JN200, intrinsic viscosity is 0.75 dL / g;

[0124] Flame retardant: Brominated epoxy resin, manufactured by Israel Chemicals, brand name F-3100;

[0125] Ester exchange inhibitor: Styrene-grafted glycidyl methacrylate, manufactured by Jia Yi Rong Compatibilizer Jiangsu Co., Ltd., brand name SAG002;

[0126] Compatibilizer: methyl methacrylate-butadiene-styrene terpolymer, manufactured by Kaneka Corporation of Japan, brand name M722;

[0127] Antioxidant 1076: Manufacturer is BASF, Germany;

[0128] Antioxidant S-9228: Manufacturer is Dover Corporation, USA;

[0129] Lubricant: Manufacturer is Italian company Fagi S.A., brand name is AHS;

[0130] (2) By weight, 50 parts PC, 16 parts PET, 24 parts PCTG, 10 parts flame retardant, 0.7 parts transesterification inhibitor, 4 parts compatibilizer, 0.2 parts antioxidant 1076, 0.2 parts antioxidant S-9228 and 0.2 parts lubricant are mixed evenly and added from the main feed port of a twin-screw extruder and melt-extruded to obtain flame-retardant and chemically resistant dimensionally stable PC composite material;

[0131] The twin-screw extruder operates at a speed of 400 rpm, with temperatures of 230℃ in zone 1, 235℃ in zone 2, 240℃ in zone 3, 240℃ in zone 4, 240℃ in zone 5, 240℃ in zone 6, 240℃ in zone 7, 240℃ in zone 8, 235℃ in zone 9, and 235℃ in zone 10.

[0132] The final flame-retardant, chemically resistant, and dimensionally stable PC composite material exhibited a tensile strength of 56.3 MPa, a flexural strength of 76.2 MPa, a flexural modulus of 2195 MPa, a notched impact strength of 654 J / m, a heat distortion temperature of 94.5℃, a flame retardancy rating of 1.6 mm V2, a shrinkage rate of 0.53% in the flow direction, and a shrinkage rate of 0.55% perpendicular to the flow direction. After chemical resistance testing, the specimen remained intact without cracking.

Claims

1. A flame-retardant, chemically resistant, and dimensionally stable PC composite material, characterized in that, By weight, it includes 40-75 parts PC, 10-20 parts PET, 10-30 parts PCTG, 5-10 parts flame retardant, and 0.5-1 parts transesterification inhibitor.

2. The flame-retardant, chemically resistant, and dimensionally stable PC composite material according to claim 1, characterized in that, The melt flow index of PC at 300℃ and 1.2kg is 5-25g / 10min.

3. The flame-retardant, chemically resistant, and dimensionally stable PC composite material according to claim 1, characterized in that, The intrinsic viscosity of PET is 0.8-0.9 dL / g.

4. The flame-retardant, chemically resistant, and dimensionally stable PC composite material according to claim 1, characterized in that, The intrinsic viscosity of PCTG is 0.7-0.8 dL / g.

5. The flame-retardant, chemically resistant, and dimensionally stable PC composite material according to claim 1, characterized in that, The flame retardant is brominated epoxy resin, and the transesterification inhibitor is styrene-grafted glycidyl methacrylate.

6. The flame-retardant, chemically resistant, and dimensionally stable PC composite material according to claim 1, characterized in that, By weight, it also includes 2-5 parts compatibilizer and 0.5-1 part additives.

7. The flame-retardant, chemically resistant, and dimensionally stable PC composite material according to claim 6, characterized in that, The compatibilizer is a terpolymer of methyl methacrylate-butadiene-styrene, and the additives are antioxidants and / or lubricants.

8. A method for preparing a flame-retardant, chemically resistant, and dimensionally stable PC composite material as described in any one of claims 1 to 7, characterized in that, After the components are mixed evenly according to the formula, they are melt-extruded from a twin-screw extruder to obtain a flame-retardant, chemically resistant, and dimensionally stable PC composite material.