Solvent-resistant flame-retardant PC / PBT alloy material and preparation method thereof

Abstract

This invention relates to the field of polymer materials technology, and provides a solvent-resistant and flame-retardant PC / PBT alloy material, comprising PC, PBT, a toughening agent, a flame retardant, a transesterification inhibitor, and an antioxidant; the mass ratio of PC to PBT is (4-6):1; based on a total mass of 100 parts of PC and PBT, the toughening agent comprises 8-30 parts, the flame retardant 13-17 parts, the transesterification inhibitor 0.5-3 parts, and the antioxidant 0.01-0.3 parts; the toughening agent includes a toughening compatibilizer and a silicon-containing toughening agent. The solvent-resistant and flame-retardant PC / PBT alloy material provided by this invention effectively solves the problem of poor solvent resistance in high-PC-content PC / PBT alloys, possessing excellent solvent resistance, impact resistance at room and low temperatures, flame retardancy, and processing performance. It can be widely used in fields requiring high solvent resistance, flame retardancy, and mechanical properties. Moreover, the production process is simple, making it highly suitable for industrial production and possessing good market prospects.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and more specifically, to a solvent-resistant and flame-retardant PC / PBT alloy material and its preparation method. Background Technology

[0002] PC / PBT alloys are blends of PC (polycarbonate) and PBT (polybutylene terephthalate). PC possesses excellent impact resistance, heat resistance, high strength, high modulus of elasticity, and low forming shrinkage. Increasing the PC content in PC / PBT alloys can effectively improve their mechanical properties, heat resistance, and dimensional stability. However, due to PC's poor solvent resistance, high-PC-content PC / PBT alloys are not ideal in terms of solvent resistance, and are prone to stress cracking and swelling under solvent conditions, limiting their application range. Increasing the PBT content in PC / PBT alloys can improve solvent resistance to some extent, but it also leads to a significant decrease in mechanical properties, heat resistance, and flame retardancy.

[0003] Therefore, improving the solvent resistance of PC / PBT alloy materials with high PC content is an urgent problem to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a solvent-resistant and flame-retardant PC / PBT alloy material to solve the technical problem of poor solvent resistance in existing PC / PET alloy materials with high PC content.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention provides a solvent-resistant and flame-retardant PC / PBT alloy material, comprising PC, PBT, toughening agent, flame retardant, transesterification inhibitor and antioxidant;

[0007] The mass ratio of PC to PBT is (4-6):1; based on a total mass of 100 parts of PC and PBT, the toughening agent is 8-30 parts, the flame retardant is 13-17 parts, the ester exchange agent is 0.5-3 parts, and the antioxidant is 0.01-0.3 parts.

[0008] The toughening agent includes a toughening compatibilizer and a silicon-containing toughening agent.

[0009] The solvent-resistant and flame-retardant PC / PBT alloy material provided by this invention can effectively improve the solvent resistance of high PC content PC / PBT alloy materials by using a combination of toughening compatibilizer and silicon-containing toughening agent.

[0010] According to some embodiments of the present invention, the toughening compatibilizer contains a glycidyl methacrylate structure.

[0011] According to some embodiments of the present invention, the toughening compatibilizer comprises ethylene-methyl acrylate-glycidyl methacrylate and / or ethylene-butyl acrylate-glycidyl methacrylate.

[0012] According to some embodiments of the present invention, the silicon-containing toughening agent is a core-shell structure toughening agent with a cross-linked acrylate and organosilicon copolymer as the core and a grafted polymethyl methacrylate as the shell, such as S-2001, S-2051, S-2030, S-2050, S-2200 and other silicon-containing toughening agents with the above-mentioned core-shell structure from Mitsubishi Corporation of Japan.

[0013] According to some embodiments of the present invention, the mass ratio of the toughening compatibilizer to the silicon-containing toughening agent is (5.5-7):1.

[0014] According to some embodiments of the present invention, the melt index of the PC at 250°C and 5kg is 5 to 20 g / min.

[0015] According to some embodiments of the present invention, the intrinsic viscosity of the PBT at 25°C is 0.8 to 1.3 dL / g.

[0016] According to some embodiments of the present invention, the flame retardant is a brominated flame retardant.

[0017] In this invention, a brominated flame retardant is selected, which has good compatibility with PC / PBT alloy materials and minimal impact on their mechanical properties. This significantly improves the flame retardant performance of the PC / PBT alloy material without reducing its impact resistance. Compared with other flame retardants, this effectively avoids adverse effects on the mechanical properties of PC / PBT alloy materials.

[0018] According to some embodiments of the present invention, the flame retardant comprises phenoxytetrabromobisphenol A carbonate oligomer and / or tris(tribromophenoxy)triazine.

[0019] According to some embodiments of the present invention, the transesterification inhibitor includes at least one of ESC-PGP, sodium dihydrogen phosphate, disodium dihydrogen pyrophosphate, sodium pyrophosphate, and triphenyl phosphite.

[0020] In this invention, the sodium dihydrogen phosphate is preferably anhydrous sodium dihydrogen phosphate.

[0021] According to some embodiments of the present invention, the antioxidant includes at least one of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester (antioxidant 1076), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010), and tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168).

[0022] In a second aspect, the present invention provides a method for preparing the PC / PBT alloy material described in the first aspect, comprising: mixing the components and feeding them into a twin-screw granulator, melting and extruding them at 190-260°C, cooling, and pelletizing them to obtain the solvent-resistant and flame-retardant PC / PBT alloy material.

[0023] According to some embodiments of the present invention, the melt extrusion yield is 300-600 kg / h.

[0024] According to some embodiments of the present invention, PC and PBT are dried before the components are mixed.

[0025] According to some embodiments of the present invention, PC and PBT are dried to a moisture content of ≤250ppm.

[0026] The beneficial effects of this invention are at least as follows:

[0027] The solvent-resistant and flame-retardant PC / PBT alloy material provided by this invention effectively solves the problem of poor solvent resistance in high PC content PC / PBT alloys. It has excellent solvent resistance, impact resistance at room temperature and low temperature, flame retardancy, and processing performance. It can be widely used in fields with high requirements for solvent resistance, flame retardancy, and mechanical properties. Moreover, the production process is simple and it is very suitable for industrial production, with good market prospects. Detailed Implementation

[0028] To make the technical problem to be solved, the technical solution, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely for illustrating this patent and do not limit the scope of protection of this invention in any way.

[0029] Unless otherwise defined, the technical terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art. Unless otherwise specified, the reagents used in the following embodiments are conventional biochemical reagents; the raw materials, instruments, and equipment used in the following embodiments can all be obtained commercially or by existing methods; unless otherwise specified, the reagent dosages are those used in routine experimental operations; unless otherwise specified, the experimental methods are conventional methods.

[0030] In the various embodiments and comparative examples of the present invention, the performance data were tested according to the following test methods:

[0031] Tensile strength test: performed according to ASTM D638 standard.

[0032] Bending strength test: performed according to ASTM D790 standard.

[0033] Notched impact strength test: performed according to ASTM D256 standard.

[0034] Vertical flammability rating test: conducted according to UL94 standard.

[0035] Solvent resistance test: conducted according to GB / T11547-2008 standard, the organic solvent used in the test is electronic cleaning agent ENIENTEC0101.

[0036] The materials used in the various embodiments and comparative examples of the present invention are as follows:

[0037] PC: PC-141R, SABIC Corporation.

[0038] PBT: PBT-1100A, Chang Chun Chemical Co., Ltd., Taiwan, China.

[0039] Brominated flame retardant: BC-58 (phenoxytetrabromobisphenol A carbonate oligomer), Great Lakes, USA.

[0040] Ester exchange inhibitor: ESC-PGP, Nanjing Fujiu Chemical Co., Ltd.

[0041] Toughening compatibilizer: Ethylene-methyl acrylate-glycidyl methacrylate, Arkema, France.

[0042] Silicon-containing toughening agent: S2030, Mitsubishi Corporation, Japan.

[0043] Antioxidant: Irganox 1076: Irganox 168 = 2:1, BASF.

[0044] Weigh the raw materials according to the components and proportions shown in Table 1, and prepare the PC / PBT alloy materials of each example and comparative example according to the following method:

[0045] (1) Dry PC and PBT in a dehumidifying dryer for 3 to 4 hours to reduce their water content to ≤250ppm;

[0046] (2) Add each raw material component to a 200L high-speed mixer, mix for 2 minutes in high-speed mode and 3 minutes in low-speed mode to obtain a homogeneous mixture;

[0047] (3) The homogeneous mixture obtained in step (2) is added to the main barrel of the RXT-65 twin-screw extruder for melt extrusion. The processing technology of the twin-screw extruder is as follows: the processing temperature of the twin-screw extruder is 190~280℃. The extruder includes seven temperature zones, of which the first zone is 190℃, the second zone is 220℃, the third zone is 230℃, the fourth zone is 240℃, the fifth zone is 250℃, the sixth zone is 250℃, and the seventh zone is 245℃. The screw speed is 500r / min and the output is 500kg / h. The strip is cooled by water tank and granulated to obtain PC / PBT alloy material.

[0048] Table 1

[0049]

[0050] The PC / PBT alloy materials prepared in each embodiment and comparative example were dried at 120°C for 2 hours and then injection molded into ASTM standard specimens using an injection molding machine. The temperatures of each section of the injection molding machine were 230°C, 240°C, and 250°C, respectively, with the nozzle temperature at 250°C and the hot runner temperature at 260°C.

[0051] The performance of the injection-molded specimens was tested after being placed at 50% relative humidity and 23℃ for 24 hours. The low-temperature notched impact strength was tested after being placed at -40℃ for 3 hours.

[0052] The performance test results are shown in Table 2.

[0053] Table 2

[0054]

[0055]

[0056] It should be noted that the embodiments described above are only for explaining the present invention and do not constitute any limitation on the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein relates to specific methods, materials, and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A solvent-resistant and flame-retardant PC / PBT alloy material, characterized in that, It is composed of PC, PBT, toughening agent, flame retardant, transesterification inhibitor and antioxidant; The mass ratio of PC to PBT is (4-6):1; based on a total mass of 100 parts of PC and PBT, the toughening agent is 8-30 parts, the flame retardant is 13-17 parts, the ester exchange agent is 0.5-3 parts, and the antioxidant is 0.01-0.3 parts. The toughening agent includes a toughening compatibilizer and a silicon-containing toughening agent; the toughening compatibilizer contains a glycidyl methacrylate structure; the silicon-containing toughening agent is a core-shell toughening agent with a cross-linked acrylate and organosilicon copolymer as the core and a grafted polymethyl methacrylate as the shell; the mass ratio of the toughening compatibilizer to the silicon-containing toughening agent is (5.5~7):

1.

2. The PC / PBT alloy material according to claim 1, characterized in that, The toughening compatibilizer includes ethylene-methyl acrylate-glycidyl methacrylate and / or ethylene-butyl acrylate-glycidyl methacrylate.

3. The PC / PBT alloy material according to claim 1 or 2, characterized in that, The flame retardant is a bromine-based flame retardant.

4. The PC / PBT alloy material according to claim 3, characterized in that, The flame retardant includes phenoxytetrabromobisphenol A carbonate oligomer and / or tris(tribromophenoxy)triazine.

5. The PC / PBT alloy material according to claim 1 or 2, characterized in that, Ester exchange inhibitors include at least one of ESC-PGP, sodium dihydrogen phosphate, disodium dihydrogen pyrophosphate, sodium pyrophosphate, and triphenyl phosphite.

6. The PC / PBT alloy material according to claim 1 or 2, characterized in that, The antioxidant includes at least one of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and tris(2,4-di-tert-butylphenyl)phosphite.

7. The method for preparing the PC / PBT alloy material according to any one of claims 1-6, characterized in that, include: After mixing the components, the mixture is fed into a twin-screw granulator and melt-extruded at 190–260°C. After cooling and pelletizing, the solvent-resistant and flame-retardant PC / PBT alloy material is obtained.

8. The preparation method according to claim 7, characterized in that, PC and PBT are dried before the components are mixed.

9. The preparation method according to claim 8, characterized in that, Dry PC and PBT to a moisture content of ≤250ppm.

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