Weather-resistant solvent-resistant polycarbonate material and preparation method thereof

Abstract

The invention discloses a weather-resistant and solvent-resistant polycarbonate material and a preparation method thereof. The polycarbonate material comprises the following components in parts by weight: 100 parts of polycarbonate, 10-20 parts of polyamide, 0.3-1.0 part of nickel salt, 2-5 parts of a compatilizer, 0.3-0.6 part of an antioxidant and 0.1-1 part of an ultraviolet light absorber, the polyamide is prepared from binary acid, 2, 5-bis (pyridine-4-yl) terephthalic acid and diamine in a molar ratio of 1: (0.05-0.1): (1.1-1.2) through polycondensation. The method can effectively improve the tolerance and hydrolysis resistance of the polycarbonate to the xylene solvent.

Description

Technical Field

[0001] The present application relates to the field of polycarbonate materials, and in particular to a weather-resistant and solvent-resistant polycarbonate material and a preparation method thereof. Background Art

[0002] Polycarbonate (PC) is a thermoplastic engineering plastic with excellent comprehensive performance. It has the characteristics of high light transmittance, strong impact resistance, and good heat resistance. It is widely used in automotive parts, electronic and electrical housings, optical devices and other fields. However, the carbonate bond (-O-CO-O-) in the polycarbonate molecular chain makes it exhibit poor tolerance to polar solvents (such as acetone and chloroform). This is because the solvent molecules can easily penetrate into the interior of the polymer through hydrogen bonding, causing swelling and even stress cracking. To improve this problem, the existing technology mostly adopts the method of blending with polyester resin, using the polar groups of polyester to competitively bind with solvent molecules to form a physical barrier. For example, the introduction of polyethylene terephthalate (PET) can improve the resistance of PC to polar solvents such as ethanol.

[0003] However, polyesters struggle to effectively block xylene penetration. Xylene's solubility parameters are similar to those of PC, and its low-polarity aromatic ring structure can interact with PC's benzene rings through π-π stacking, resulting in a high swelling ratio for PC in xylene. This severely limits its application in chemical containers, fuel systems, and other fields. Summary of the Invention

[0004] The present application provides a weather-resistant and solvent-resistant polycarbonate material and a preparation method thereof, which can effectively improve the tolerance of polycarbonate to xylene solvent.

[0005] In the first aspect, the present application provides a weather-resistant and solvent-resistant polycarbonate material, comprising the following components in parts by weight: 100 parts of polycarbonate, 10-20 parts of polyamide, 0.3%-1.0 part of nickel salt, 1-5 parts of surface-grafted ester-group polytetrafluoroethylene particles, 2-5 parts of compatibilizer, 0.3-0.6 parts of antioxidant, and 0.1-1 part of ultraviolet absorber; the polyamide is prepared by condensation of a dibasic acid, 2,5-di(pyridin-4-yl)terephthalic acid and a diamine in a molar ratio of 1:0.05-0.1:1.1-1.2.

[0006] In any of the above technical solutions, the dibasic acid is adipic acid, and the diamine is butanediamine.

[0007] In any of the above technical solutions, the polycarbonate is selected from at least one of aromatic polycarbonate, aliphatic polycarbonate and branched polycarbonate.

[0008] In any of the above technical solutions, the intrinsic viscosity of the polyamide is 1.0 to 1.5 dL / g.

[0009] This application introduces a pyridine-containing polyamide (PA) and nickel salt to synergize and construct a multi-stage solvent resistance enhancement system. Specifically, the polyamide main chain is formed by the condensation of adipic acid, butanediamine and 2,5-di(pyridin-4-yl) terephthalic acid, wherein adipic acid and butanediamine form a PA46 structure, whose high crystallinity (about 50%) can effectively block the diffusion of xylene molecules. The bipyridine group of 2,5-di(pyridin-4-yl) terephthalic acid can not only increase the polarity of the polyamide, but also react with nickel ions (Ni 2+ ) forms a coordination complex network, further strengthening the interaction between molecular chains, improving the barrier effect of xylene molecules, and improving the anti-hydrolysis performance. Nickel salt uses nickel acetylacetonate, which, compared with inorganic salts such as nickel sulfate, does not release acidic by-products during processing and avoids catalyzing PC hydrolysis. Compared with Mg 2+ Weakly coordinating ions, Ni 2+ The coordination ability of Cu is stronger and can form a stable six-coordinate structure. 2+ 、Zn 2+ Strong Lewis acids such as pyridine significantly reduce their catalytic activity towards PC hydrolysis, thereby improving solvent resistance while ensuring material durability. Furthermore, the introduction of pyridine groups can complex residual metal ions from raw material processing, improving hydrolysis resistance.

[0010] In any of the above technical solutions, the material comprises 1 to 5 parts by mass of polytetrafluoroethylene particles with surface grafted ester groups.

[0011] In any of the above technical solutions, the preparation method of the polytetrafluoroethylene particles with ester groups grafted on the surface is as follows:

[0012] The plasma-treated polytetrafluoroethylene particles are immersed in a methacrylate monomer solution and an initiator is added;

[0013] The reaction is carried out at 60-80°C for 2-4 hours to graft polymerize the methacrylate monomer on the surface of the polytetrafluoroethylene particles, and the product is obtained after washing and drying.

[0014] In any of the above technical solutions, the initiator is a peroxide initiator, preferably benzoyl peroxide.

[0015] In any of the above technical solutions, the solvent is toluene.

[0016] In any of the above technical solutions, the amount of the initiator is 1 to 3% of the mass of the methacrylate monomer.

[0017] In any of the above technical solutions, the mass ratio of the polytetrafluoroethylene particles to the methacrylate monomer is 1:1.2-2.5.

[0018] In any of the above technical solutions, the methacrylate monomer is selected from at least one of methyl methacrylate, ethyl methacrylate, butyl methacrylate, and dimethylaminoethyl methacrylate.

[0019] In any of the above technical solutions, the methacrylate monomer is dimethylaminoethyl methacrylate.

[0020] In any of the above technical solutions, the particle size of the polytetrafluoroethylene particles is 0.2 to 1 μm.

[0021] In any of the above technical solutions, the compatibilizer is maleic anhydride-styrene copolymer.

[0022] In any of the above technical solutions, the antioxidant is selected from phosphite antioxidants and / or hindered phenol antioxidants.

[0023] Illustratively, the antioxidant is selected from one or more of antioxidant 1010, antioxidant 168, antioxidant 1076, and antioxidant 1790.

[0024] In any of the above technical solutions, the ultraviolet absorber is selected from benzotriazole and benzophenone ultraviolet absorbers.

[0025] Exemplarily, the ultraviolet absorber is at least one of UV-329, UV-P, and UV-531.

[0026] PTFE particles with ester grafted on the surface help to inhibit the penetration of solvents and improve the solvent resistance and hydrolysis resistance of PC. In addition, the loss of melt fluidity caused by the coordination of polyamide and nickel salt is compensated by PTFE particles with ester grafted on the surface (particle size 0.2-1 μm). After plasma activation, PTFE has good compatibility with the polycarbonate resin matrix after methacrylate monomer is grafted on its surface. In particular, the compatibility of surface-grafted dimethylaminoethyl methacrylate (DMAEMA) is better. The ester group has good compatibility with the polar carbonate group of PC, and the amino structure of DMAEMA can also form hydrogen bonds with the carboxyl group of polyamide, promoting the three-phase interface bonding. The lubricating effect of PTFE can reduce the melt viscosity and improve the melt fluidity of PC, which is beneficial for the molding of thin-walled or complex products and helps to reduce hydrolysis. At the same time, particle size control avoids stress concentration problems caused by agglomeration.

[0027] In a second aspect, the present application provides a method for preparing a weather-resistant and solvent-resistant polycarbonate material, comprising:

[0028] According to the ratio of any of the above-mentioned polycarbonate materials, polycarbonate, polyamide, nickel salt, polytetrafluoroethylene particles with surface grafted ester groups, a compatibilizer, an antioxidant, and an ultraviolet absorber are dried and evenly mixed to obtain a blend;

[0029] The blend is melted, extruded, pulled and granulated at 260-280 DEG C to obtain a weather-resistant and solvent-resistant polycarbonate material.

[0030] In summary, this application has the following beneficial effects:

[0031] This application achieves a balanced balance of weather resistance, solvent resistance, and processing performance in polycarbonate materials through a multi-component collaborative design. The coordination network of pyridine-containing polyamide and nickel salt significantly inhibits xylene penetration, reducing swelling to 2% to 3%. PTFE particles grafted with ester groups on the surface improve melt flow and compensate for the processing resistance caused by the polyamide. The high coordination capacity and low catalytic activity of nickel acetylacetonate ensure material durability. The resulting composite material is suitable for harsh environments such as automotive fuel lines and chemical equipment linings. DETAILED DESCRIPTION

[0032] Preparation Example

[0033] Preparation Example 1: A polyamide, the raw material ratio is as follows:

[0034] Adipic acid 1000 g (6.85 mol), 2,5-di(pyridin-4-yl)terephthalic acid 165 g (0.51 mol), butanediamine 664 g (7.54 mol).

[0035] The preparation steps are as follows:

[0036] Adipic acid and 2,5-di(pyridin-4-yl)terephthalic acid were added to a 10 L reactor, and 5 L of N-methylpyrrolidone (NMP) solvent was added. The mixture was stirred under nitrogen and heated to 80° C. until completely dissolved.

[0037] Slowly add butanediamine dropwise, control the temperature at 100-110°C, add for 1 hour, and continue to keep warm and react for 2 hours to generate a prepolymer.

[0038] The temperature was raised to 260°C, the vacuum was reduced to 50 Pa, and the polycondensation was carried out for 4 hours to remove small molecular by-products. The reaction was stopped, and the material was discharged and pelletized to obtain PA resin with an intrinsic viscosity of 1.2 dL / g.

[0039] Preparation Example 2: A polyamide, the raw material ratio is as follows:

[0040] Adipic acid 1200 kg (8.22 mol), 2,5-di(pyridin-4-yl)terephthalic acid 132 g (0.41 mol), butanediamine 869.5 g (9.86 mol).

[0041] The preparation steps are as follows:

[0042] Adipic acid and 2,5-di(pyridin-4-yl)terephthalic acid were added to a 10 L reactor, and 6 L of N-methylpyrrolidone (NMP) solvent was added. The mixture was stirred under nitrogen and heated to 80° C. until completely dissolved.

[0043] Slowly add butanediamine dropwise, control the temperature at 100-110°C, add for 1.5 hours, and continue to keep warm and react for 2.5 hours to generate a prepolymer.

[0044] The temperature was raised to 270°C, the vacuum was evacuated to 30 Pa, and polycondensation was carried out for 5 hours to remove small molecular by-products. The reaction was stopped, and the material was discharged and pelletized to obtain PA resin with an intrinsic viscosity of 1.0 dL / g.

[0045] Preparation Example 3, a polyamide, the raw material ratio is as follows:

[0046] Adipic acid 0.8 kg (5.48 mol), 2,5-di(pyridin-4-yl)terephthalic acid 175.5 kg (0.55 mol), butanediamine 531.4 g (6.03 mol).

[0047] The preparation steps are as follows:

[0048] Adipic acid and 2,5-di(pyridin-4-yl)terephthalic acid were added to a 10 L reactor, and 4 L of N-methylpyrrolidone (NMP) solvent was added. The mixture was stirred under nitrogen and heated to 80° C. until completely dissolved.

[0049] Slowly add butanediamine dropwise, control the temperature at 100-110°C, add for 0.5 hours, and continue to keep warm and react for 1.5 hours to generate a prepolymer.

[0050] The temperature was raised to 250° C., the vacuum was evacuated to 80 Pa, and polycondensation was carried out for 3.5 hours to remove small molecular by-products. The reaction was stopped, and the material was discharged and pelletized to obtain PA resin with an intrinsic viscosity of 1.5 dL / g.

[0051] Preparation Example 4, a polyamide, which differs from Preparation Example 1 in that hexamethylenediamine is used in place of butanediamine in an equal molar amount, with the amount of hexamethylenediamine being 876 g (7.54 mol); a polyamide having an intrinsic viscosity of 1.3 dL / g is obtained.

[0052] Preparation Example 5, a polyamide, which differs from Preparation Example 1 in that 2,5-di(pyridin-4-yl)terephthalic acid is replaced by an equal molar amount of terephthalic acid, with the amount of terephthalic acid being 84.7 g (0.51 mol); a polyamide having an intrinsic viscosity of 1.1 dL / g is obtained.

[0053] Preparation Example 6, a polyamide, the raw material ratio is as follows:

[0054] 2.02 kg (10 mol) of sebacic acid, 1.73 kg (10 mol) of decanediamine.

[0055] The preparation steps are as follows:

[0056] Sebacic acid was added to a 10 L reactor, and 5 L of N-methylpyrrolidone (NMP) solvent was added. The mixture was stirred under nitrogen protection and heated to 80° C. until it was completely dissolved.

[0057] Slowly add decanediamine dropwise, control the temperature at 100-110°C, add for 1 hour, and continue to keep warm and react for 2 hours to generate a prepolymer.

[0058] The temperature was raised to 260°C, the vacuum was reduced to 50 Pa, and the polycondensation was carried out for 4 hours to remove small molecular by-products. The reaction was stopped, and the material was discharged and pelletized to obtain PA resin with an intrinsic viscosity of 1.2 dL / g.

[0059] Preparation Example a: a PTFE particle with a surface grafted ester group, the raw material ratio is as follows:

[0060] PTFE particles (particle size 0.5 μm, 1 kg), dimethylaminoethyl methacrylate (DMAEMA, 1.8 kg), and benzoyl peroxide (0.036 kg).

[0061] The preparation steps are as follows: PTFE particles are treated with oxygen plasma (power 150W, time 15 minutes), then immersed in a toluene solution (5L) containing dimethylaminoethyl methacrylate and benzoyl peroxide, and reacted at 70°C for 3 hours; after filtering, the particles are washed with acetone and ethanol in sequence, and vacuum dried at 60°C for 12 hours.

[0062] Preparation Example b, a PTFE particle with a surface grafted ester group, the raw material ratio is as follows:

[0063] PTFE particles (D90 particle size 0.2 μm, 1 kg), dimethylaminoethyl methacrylate (DMAEMA, 1.2 kg), and benzoyl peroxide (0.036 kg).

[0064] The preparation steps are as follows: PTFE particles are treated with oxygen plasma (power 100W, time 60 minutes), then immersed in a toluene solution (5L) containing dimethylaminoethyl methacrylate and benzoyl peroxide, and reacted at 73°C for 3 hours; after filtering, the solution is washed with acetone and ethanol in sequence, and vacuum-dried at 60°C for 12 hours.

[0065] Preparation Example C, a PTFE particle with ester grafted on the surface, the raw material ratio is as follows:

[0066] PTFE particles (D90 particle size 1 μm, 1 kg), dimethylaminoethyl methacrylate (DMAEMA, 2.5 kg), and benzoyl peroxide (0.04 kg).

[0067] The preparation steps are as follows: PTFE particles are treated with oxygen plasma (power 200W, time 30 minutes), then immersed in a toluene solution (5L) containing dimethylaminoethyl methacrylate and benzoyl peroxide, and reacted at 65°C for 4 hours; after filtering, the particles are washed with acetone and ethanol in sequence, and vacuum dried at 60°C for 12 hours.

[0068] Preparation Example d: PTFE particles with surface grafted ester groups, wherein dimethylaminoethyl methacrylate is replaced with an equal mass of methyl methacrylate.

[0069] Example

[0070] Example 1, a weather-resistant and solvent-resistant polycarbonate material, the raw material ratio is as follows:

[0071] Polycarbonate (brand name Lexan 141R): 6.0 kg; polyamide (obtained in Preparation Example 1): 0.72 kg; nickel acetylacetonate: 0.036 kg; surface-grafted ester-based PTFE particles (obtained in Preparation Example a): 0.18 kg; maleic anhydride-styrene copolymer (SMAH, MAH content 8%): 0.18 kg; antioxidant (0.018 kg antioxidant 1010 + 0.018 kg antioxidant 168): 0.036 kg; ultraviolet absorber (UV-531): 0.025 kg.

[0072] Preparation steps:

[0073] Raw material pretreatment: polycarbonate, polyamide, surface-grafted ester-based PTFE particles, and SMAH were vacuum dried at 80° C. for 8 hours, with a moisture content of ≤0.02%.

[0074] Preparation of premix: Add dried polycarbonate, polyamide, surface grafted ester-based PTFE particles, maleic anhydride-styrene copolymer, nickel acetylacetonate, antioxidant, and ultraviolet absorber into a high-speed mixer (speed 500 rpm) and mix for 15 minutes until uniform.

[0075] Melt extrusion: A twin-screw extruder (length-to-diameter ratio 40:1) was used, with set temperatures of 260°C for zone 1, 270°C for zone 2, 275°C for zone 3, and 280°C for zone 4. The die temperature was 275°C, the screw speed was 300 rpm, and the vacuum devolatilization pressure was 80 Pa. The extruded strands were water-cooled and pelletized.

[0076] Example 2, a weather-resistant and solvent-resistant polycarbonate material, the raw material ratio is as follows:

[0077] Polycarbonate (brand name Lexan 141R): 5.0 kg; polyamide (obtained in Preparation Example 2): 0.5 kg; nickel acetylacetonate: 0.015 kg; surface-grafted ester-based PTFE particles (obtained in Preparation Example b): 0.05 kg; maleic anhydride-styrene copolymer (SMAH, MAH content 8%): 0.1 kg; antioxidant (0.018 kg antioxidant 1076): 0.015 kg; ultraviolet absorber (UV-531): 0.01 kg.

[0078] Preparation steps:

[0079] Raw material pretreatment: polycarbonate, polyamide, surface-grafted ester-based PTFE particles, and SMAH were vacuum dried at 75° C. for 10 hours, with a moisture content of ≤0.02%.

[0080] Preparation of premix: Add dried polycarbonate, polyamide, surface grafted ester-based PTFE particles, maleic anhydride-styrene copolymer, nickel acetylacetonate, antioxidant, and ultraviolet absorber into a high-speed mixer (speed 500 rpm) and mix for 15 minutes until uniform.

[0081] Melt extrusion: A twin-screw extruder (length-to-diameter ratio 40:1) was used, with set temperatures of 255°C (zone 1), 265°C (zone 2), 270°C (zone 3), and 275°C (zone 4), a die temperature of 275°C, a screw speed of 250 rpm, and a vacuum devolatilization pressure of 100 Pa. The extruded strands were water-cooled and pelletized.

[0082] Example 3, a weather-resistant and solvent-resistant polycarbonate material, the raw material ratio is as follows:

[0083] Polycarbonate (brand Panlite AD-5503): 8.0 kg; polyamide (obtained in Preparation Example 3): 1.6 kg; nickel acetylacetonate: 0.08 kg; surface-grafted ester-based PTFE particles (obtained in Preparation Example c): 0.4 kg; maleic anhydride-styrene copolymer (SMAH, MAH content 8%): 0.18 kg; antioxidant (0.024 kg antioxidant 1790 + 0.016 kg antioxidant 168): 0.04 kg; ultraviolet absorber (UV-531): 0.03 kg.

[0084] Preparation steps:

[0085] Raw material pretreatment: polycarbonate, polyamide, surface-grafted ester-based PTFE particles, and SMAH were vacuum dried at 85° C. for 6 hours, with a moisture content of ≤0.02%.

[0086] Preparation of premix: Add dried polycarbonate, polyamide, surface grafted ester-based PTFE particles, maleic anhydride-styrene copolymer, nickel acetylacetonate, antioxidant, and ultraviolet absorber into a high-speed mixer (speed 500 rpm) and mix for 15 minutes until uniform.

[0087] Melt extrusion: A twin-screw extruder (length-to-diameter ratio 40:1) was used, with set temperatures of 265°C for zone 1, 275°C for zone 2, 280°C for zone 3, and 285°C for zone 4. The die head temperature was 275°C, the screw speed was 300 rpm, and the vacuum devolatilization pressure was 50 Pa. The extruded strands were water-cooled and pelletized.

[0088] Example 4 is a weather-resistant and solvent-resistant polycarbonate material. The difference from Example 1 is that the polyamide of Preparation Example 1 is replaced by the polyamide of Preparation Example 4 of equal mass.

[0089] Example 5, a weather-resistant and solvent-resistant polycarbonate material, differs from Example 1 in that nickel acetylacetonate is replaced by nickel sulfate of equal mass.

[0090] Example 6, a weather-resistant and solvent-resistant polycarbonate material, differs from Example 1 in that the surface-grafted ester-based PTFE particles of Preparation Example d are replaced with the surface-grafted ester-based PTFE particles of Preparation Example a by an equal mass of nickel.

[0091] Example 7 is a weather-resistant and solvent-resistant polycarbonate material. The difference from Example 1 is that polytetrafluoroethylene particles with surface grafted ester groups are not added.

[0092] Comparative Example

[0093] Comparative Example 1 is a weather-resistant and solvent-resistant polycarbonate material, which differs from Example 1 in that nickel acetylacetonate is replaced by zinc acetylacetonate of equal mass.

[0094] Comparative Example 2 is a weather-resistant and solvent-resistant polycarbonate material, which differs from Example 1 in that nickel acetylacetonate is replaced by magnesium acetylacetonate of equal mass.

[0095] Comparative Example 3 is a weather-resistant and solvent-resistant polycarbonate material, which differs from Example 1 in that the polyamide of Preparation Example 1 is replaced by the polyamide of Preparation Example 5 of equal mass.

[0096] Comparative Example 4 is a weather-resistant and solvent-resistant polycarbonate material. The difference from Example 1 is that the polyamide of Preparation Example 1 is replaced by the polyamide of Preparation Example 6 of equal mass; and no nickel salt is added to the raw materials.

[0097] Performance testing

[0098] Test 1: Tensile properties test

[0099] Specimen preparation: ISO 527-2:2021 standard 1A tensile specimens (gauge length 50 mm, thickness 4 mm) were prepared by injection molding.

[0100] Test method: Refer to ISO 527:2021, use a universal materials testing machine (Instron 5967), tensile rate 50 mm / min, record tensile strength (MPa) and elongation at break (%).

[0101] Test 2: Xylene resistance test

[0102] Sample preparation: The materials of the examples and comparative examples were injection molded into standard dumbbell-shaped samples (size: 80 mm long, 10 mm wide, 4 mm thick). Injection molding conditions: mold temperature 80°C, injection pressure 80 MPa, holding time 30 s.

[0103] Test method: Refer to ASTM D543-21 for testing. Immerse the sample in xylene solvent until the liquid surface completely covers the sample. The temperature is 25±1℃ and the immersion time is 24 hours. Remove the sample, use filter paper to absorb the surface solvent, and immediately measure the mass change rate (swelling rate). Swelling rate calculation formula:

[0104] Swelling rate (%) = (W t -W0) / W0×100

[0105] Where W0 is the initial mass, W t The quality is after soaking.

[0106] Test 3: Fluidity Test

[0107] Sample preparation: The pellets prepared in Examples and Comparative Examples were directly tested.

[0108] Test method: Refer to ISO 1133:2022 for testing, using a melt volume flow rate instrument (MVR instrument), temperature 240 ° C, load 5 kg. Record the melt volume extruded within 10 minutes and record it as the initial MVR (cm 3 / 10min).

[0109] Test 4: Hydrolysis resistance

[0110] Sample preparation: The pellets were placed in a constant temperature and humidity chamber at 95°C and 100% RH for 24 hours (FWL storage).

[0111] Test Method: After storage, the pellets were tested for post-hydrolysis MVR at 240°C and 5 kg according to ISO 1133:2022. The difference in MVR before and after storage (ΔMVR) was calculated using the formula: ΔMVR (%) = (post-hydrolysis MVR - initial MVR) / initial MVR × 100.

[0112] Table 1. Performance test results

[0113]

[0114] Analysis of test results:

[0115] Compared with Examples 1-3 (introduction of PA46 polyamide), Example 4 uses PA66 polyamide to modify polycarbonate, and its ability to inhibit the swelling of xylene is poor. Example 5 (using nickel sulfate as the metal ion supply salt) has poor tensile properties, solvent resistance, and hydrolysis resistance. The reason may be that nickel sulfate produces acidic substances during high-temperature processing, which accelerates the hydrolysis of polycarbonate. Example 6 (methyl methacrylate grafted PTFE) performs poorly in initial fluidity, which may be because methyl methacrylate has lower compatibility with the resin after modification than dimethylaminoethyl methacrylate. Example 7 did not perform surface modification on polytetrafluoroethylene, resulting in poor compatibility with the resin matrix and inability to play an effective lubricating role.

[0116] Zn introduced in Comparative Example 1 2+ It is a strong Lewis acid, and the residual uncoordinated Zn 2+ It is easy to cause hydrolysis of polycarbonate during high temperature processing. 2+ Poor coordination ability, its residual Mg 2+ The polyamides of Comparative Examples 3 and 4 do not have pyridine segments introduced into them, which prevents them from forming a coordination complex network with metal ions, reduces their tolerance to xylene, and significantly increases molecular weight degradation caused by high-temperature hydrolysis.

[0117] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A weather-resistant and solvent-resistant polycarbonate material, characterized in that: The invention comprises the following components in parts by weight: 100 parts of polycarbonate, 10-20 parts of polyamide, 0.3-1.0 parts of nickel salt, 2-5 parts of compatibilizer, 0.3-0.6 parts of antioxidant and 0.1-1 parts of ultraviolet absorber; the polyamide is prepared by polycondensation of dibasic acid, 2,5-di(pyridin-4-yl)terephthalic acid and diamine in a molar ratio of 1:0.05-0.1:1.1-1.

2.

2. The polycarbonate material according to claim 1, characterized in that The dibasic acid is adipic acid, and the diamine is butanediamine.

3. The polycarbonate material according to claim 1, characterized in that The nickel salt is nickel acetylacetonate.

4. The polycarbonate material according to claim 1, characterized in that The material comprises 1 to 5 parts of polytetrafluoroethylene particles with ester groups grafted onto the surface, and the preparation method is as follows: The plasma-treated polytetrafluoroethylene particles are immersed in a methacrylate monomer solution and an initiator is added; The reaction is carried out at 60-80°C for 2-4 hours to graft polymerize the methacrylate monomer on the surface of the polytetrafluoroethylene particles, and the product is obtained after washing and drying.

5. The polycarbonate material according to claim 4, characterized in that: The mass ratio of the polytetrafluoroethylene particles to the methacrylate monomer is 1:1.2-2.

5.

6. The polycarbonate material according to claim 4, characterized in that: The methacrylate monomer is selected from at least one of methyl methacrylate, ethyl methacrylate, butyl methacrylate, and dimethylaminoethyl methacrylate.

7. The polycarbonate material according to claim 6, characterized in that: The methacrylate monomer is dimethylaminoethyl methacrylate.

8. The polycarbonate material according to claim 4, characterized in that: The particle size of the polytetrafluoroethylene particles is 0.2 to 1 μm.

9. The polycarbonate material according to claim 1, characterized in that: The compatibilizer is maleic anhydride-styrene copolymer.

10. A method for preparing a weather-resistant and solvent-resistant polycarbonate material, characterized in that: include: According to the ratio of the polycarbonate material according to any one of claims 1 to 9, polycarbonate, polyamide, nickel salt, polytetrafluoroethylene particles with surface grafted ester groups, a compatibilizer, an antioxidant, and an ultraviolet absorber are dried and mixed uniformly to obtain a blend; The blend is melted, extruded, pulled and granulated at 260-280 DEG C to obtain a weather-resistant and solvent-resistant polycarbonate material.

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