Impact-resistant and aging-resistant polycarbonate composition as well as preparation method and application thereof

Abstract

The invention relates to an impact-resistant and aging-resistant polycarbonate composition as well as a preparation method and application thereof, and mainly solves the problems that a polycarbonate composition in the prior art is poor in aging resistance and easy to crack. The anti-impact and anti-aging polycarbonate composition provided by the invention comprises the following components in terms of 100 parts by weight of polycarbonate: (i) 5-10 parts of an anti-aging agent; (ii) 5-10 parts of a hydrolysis resistant agent; (iii) 5 to 20 parts of a compatibilizing and toughening agent; (iv) 5-20 parts of a flame retardant; (v) 1-20 parts of other auxiliary agents; wherein the polycarbonate is selected from at least one of bisphenol A polycarbonate, polysiloxane-copolycarbonate, polyester-copolycarbonate, polyether-copolycarbonate and polyamide-copolycarbonate, and the solvent is a solvent; the technical scheme well solves the problems, and can be used in the fields of household appliances, electronics, automobiles, base stations and the like.

Description

Technical Field

[0001] The present invention belongs to the field of polycarbonate materials, and relates to an impact-resistant and aging-resistant polycarbonate composition and a preparation method thereof. The composition is applicable to fields such as household appliances, electronics, automobiles, and base stations. Background Art

[0002] Polycarbonate is a general term for a class of high-molecular compounds containing carbonate structures in the molecular chain and various materials prepared based on it. Due to its excellent transparency, impact resistance, insulation, etc., it is widely used in fields such as electronic appliances, transportation, construction, machinery, medical and health, and optics. Currently, it has become the general engineering plastic with the fastest growth rate among the five major engineering plastics. However, polycarbonate generally has poor flame retardancy, is sensitive to notches, and has poor resistance to chemicals, ultraviolet rays, hydrolysis, etc., poor wear resistance, and stress cracking is likely to occur during the assembly of products. Combining the physical and chemical properties of polycarbonate with application requirements, performance improvement or optimization can be carried out specifically to meet the needs of end applications. Chinese patents CN117529526, CN117693557, and CN115461408 disclose the use of phosphazene flame retardants to improve the flame retardancy and hydrolysis resistance of polycarbonate. Chinese patent CN116096818 reports the use of a combination of clay and organic acids to achieve the hydrolysis resistance of polycarbonate. Chinese patent CN118922496 toughens polycarbonate with butadiene / acrylate copolymer and styrene / ethylene / butene / styrene copolymer for manufacturing antenna components. Chinese patent CN104292787 uses dodecyl dipropyl sulfate methylamine, alkyl sulfonates, etc. to improve the aging resistance and antistatic properties of polycarbonate. Therefore, it is of great significance to develop a polycarbonate composition that achieves an optimized balance in terms of long-term usability, economy, and aging resistance. Summary of the Invention

[0003] One of the technical problems to be solved by the present invention is the problem of poor anti-aging ability and easy cracking of polycarbonate compositions in the prior art, and to provide an impact-resistant and aging-resistant polycarbonate composition. The composition meets the usability and moldability of parts and the application requirements in fields such as household appliances, electronics, automobiles, and base stations.

[0004] Another technical problem to be solved by the present invention is to provide a preparation method for an impact-resistant and aging-resistant polycarbonate composition.

[0005] The third technical problem to be solved by the present invention is the use of the impact-resistant and aging-resistant polycarbonate composition.

[0006] To solve the above technical problem one, the technical solution adopted by the present invention is as follows: An impact-resistant and aging-resistant polycarbonate composition includes polycarbonate. Based on 100 parts by weight of polycarbonate, it further includes the following components: (i)5 - 10 parts of anti - aging agent; (ii)5 - 10 parts of hydrolysis - resistant agent; (iii)5 - 20 parts of compatibilizer and toughening agent; (iv)5 - 20 parts of flame retardant; (v)1 - 20 parts of other additives; Among them, the polycarbonate is selected from at least one of bisphenol A polycarbonate, polysiloxane - copolycarbonate, polyester - copolycarbonate, polyether - copolycarbonate, polyamide - copolycarbonate; The number - average molecular weight of the polycarbonate is 18,000 - 26,000 g / mol, preferably 20,000 - 24,000 g / mol; the anti - aging agent includes light stabilizer, heat stabilizer, and oxygen stabilizer.

[0007] In a preferred technical solution, the light stabilizer is selected from at least one of benzotriazole, polyhydroxybenzene, benzophenone, benzoxazinone and their derivatives; The heat stabilizer is selected from at least one of calcium salts, zinc salts, magnesium salts of stearic acid, oleic acid, linoleic acid, palmitic acid, linolenic acid, myristic acid, lauric acid, and palmitic acid; The oxygen stabilizer is selected from at least one of hindered phenols, phosphites, thioesters and their derivatives; The weight ratio of the light stabilizer, heat stabilizer and oxygen stabilizer is 1:(0.5 - 2):(0.5 - 2); preferably 1:(0.8 - 1.5):(0.8 - 1.5).

[0008] In a preferred technical solution, the hydrolysis - resistant agent is selected from at least one of N,N'-diphenylcarbodiimide, N,N'-dicyclohexylcarbodiimide, and polycarbodiimide.

[0009] In a preferred technical solution, the compatibilizer and toughening agent is selected from at least one of maleic anhydride - grafted copolymers of polyethylene, polypropylene, poly(ethylene / propylene), poly(ethylene / octene), poly(ethylene / vinyl acetate), poly(ethylene / acrylic ester); The maleic anhydride grafting rate of the above grafted copolymers is 0.5 - 10%, preferably 1 - 5%; The compatibilizer and toughening agent may also be selected from at least one of ethylene / maleic anhydride copolymer, propylene / maleic anhydride copolymer, ethylene / propylene / maleic anhydride copolymer, ethylene / octene / maleic anhydride copolymer, ethylene / vinyl acetate / maleic anhydride copolymer, ethylene / acrylic ester / maleic anhydride copolymer; The mass percentage content of maleic anhydride in the above copolymers is 1 - 20%, preferably 2 - 15%.

[0010] In a preferred technical solution, the flame retardant is selected from at least one of triphenyl phosphate, triisopropylphenyl phosphate, bisphenol A bis(diphenyl phosphate), bisphenol A bis(diisopropylphenyl phosphate), resorcinol bis(diphenyl phosphate), and resorcinol bis(diisopropylphenyl phosphate); The flame retardant further includes fluorinated polyolefin; the fluorinated polyolefin is selected from at least one of polytetrafluoroethylene, polyvinylidene fluoride, and ethylene / tetrafluoroethylene copolymer; The fluorinated polyolefin accounts for 0.1-10% of the total weight of the flame retardant, preferably 2-8%.

[0011] In a preferred technical solution, the other additives include a reinforcing agent, a plasticizer, and a demolding agent; The reinforcing agent is selected from at least one of talc, mica, wollastonite, glass microspheres, glass fiber, carbon fiber, and graphene; Based on 100 parts by weight of polycarbonate, the dosage of the reinforcing agent is 0.5-15 parts; The plasticizer is selected from at least one of dibutyl phthalate, dioctyl phthalate, and diphenyl phthalate; Based on 100 parts by weight of polycarbonate, the dosage of the plasticizer is 0.3-2.5 parts; The demolding agent is selected from at least one of silicone oil, carbon tetrachloride, and white oil; Based on 100 parts by weight of polycarbonate, the dosage of the demolding agent is 0.2-2.5 parts.

[0012] To solve the second of the above technical problems, the present invention provides a method for preparing the impact-resistant and aging-resistant polycarbonate composition, including the following steps: (i) Blending the light stabilizer, heat stabilizer, and oxygen stabilizer in proportion, and then subjecting them to twin-screw melt processing and extrusion with the compatibilizing and toughening agent to obtain a compatibilizing and toughening stabilizer masterbatch; (ii) Blending the compatibilizing and toughening stabilizer masterbatch with polycarbonate, hydrolysis-resistant agent, flame retardant, and other additives, and then subjecting them to twin-screw melt processing and extrusion to obtain the impact-resistant and aging-resistant polycarbonate composition.

[0013] In a preferred technical solution, the processing temperature of the compatibilizing and toughening stabilizer masterbatch is 120-180 °C, and the screw speed is 200-800 revolutions per minute; The processing temperature of the impact-resistant and aging-resistant polycarbonate composition is 250-280 °C, and the screw speed is 200-800 revolutions per minute.

[0014] To solve the third of the above technical problems, the present invention provides a use of the impact-resistant and aging-resistant polycarbonate composition.

[0015] The described use is not particularly limited, and those skilled in the art can utilize it based on the prior art according to the content disclosed in the present invention. For example, but not limited to, it can be used in the fields of household appliances, electronics, automobiles, and base stations.

[0016] Technical features of the inventive method of this patent: By introducing suitable anti-aging agents and hydrolysis-resistant agents into polycarbonate, its long-term aging performance is excellent; at the same time, through compatibilizers and toughening agents with special structures and compositions, its impact toughness is significantly improved; in addition, through the reasonable blending of flame retardants and other additives, the polycarbonate composition is given excellent fire resistance and molding processing performance, achieving good technical effects.

[0017] The performance of the present invention is measured by the following methods: Notched impact strength test: Measured according to ASTM D256 standard.

[0018] Flame retardancy test: Measured according to UL-94 standard.

[0019] Glow wire test: Measured according to GB5169-1999 standard.

[0020] Hydrolysis resistance test: After 168 hours at 85°C and 85% humidity, the impact strength is tested.

[0021] Aging resistance test: Aging under 340 nm ultraviolet light at 23°C, and the impact strength is tested.

[0022] The present invention is further elaborated below through specific examples. Specific embodiments

[0023]

Examples 1-4, Comparative Example 1

[0024] Table 1 In Examples 1-4, a compatibilizing and toughening stabilizer masterbatch was prepared using a light, heat, and oxygen stabilizer and a maleic anhydride graft copolymer, which was uniformly dispersed in the polycarbonate, effectively improving the compounding of the stabilizer combination and the resin. The composition had a high glow wire temperature and high impact toughness after hydrothermal aging and photoaging.

[0025]

Examples 5-8, Comparative Example 2

[0026] Table 2 Compared with Comparative Example 2, in Examples 5-8, a hydrolysis-resistant agent, a composite flame retardant, and a compatibilizing and toughening stabilizer masterbatch were used to prepare the polycarbonate composition, greatly improving the fire resistance, glow wire temperature, and impact toughness after hydrothermal aging and photoaging of the composition.

[0027]

Example 9

[0028]

Comparative Example 3

[0029] Table 3 Compared with Comparative Example 3, in Example 9, by using a combination of compatibilizing and toughening stabilizer masterbatch, maleic anhydride copolymer and maleic anhydride graft copolymer, etc., the impact resistance, hydrothermal aging resistance and photoaging resistance of the prepared polycarbonate composition are all superior to those of conventional block copolymer toughened polycarbonate, showing the advantages of the technology of the present invention.

Claims

1. An impact-resistant and aging-resistant polycarbonate composition, characterized in that: The invention comprises polycarbonate, and based on 100 parts by weight of the polycarbonate, further comprises the following components: (i) 5 to 10 parts of anti-aging agent; (ii) 5 to 10 parts of anti-hydrolysis agent; (iii) 5 to 20 parts of a compatibilizer and toughener; (iv) 5 to 20 parts of flame retardant; (v) 1 to 20 parts of other additives; Wherein, the polycarbonate is selected from at least one of bisphenol A polycarbonate, polysiloxane-copolycarbonate, polyester-copolycarbonate, polyether-copolycarbonate, and polyamide-copolycarbonate; The number average molecular weight of the polycarbonate is 18000-26000 g / mol; the anti-aging agent includes a light stabilizer, a heat stabilizer and an oxygen stabilizer.

2. The impact-resistant and aging-resistant polycarbonate composition according to claim 1, characterized in that: The light stabilizer is selected from at least one of benzotriazole, polyhydroxybenzene, benzophenone, benzoxazinone and derivatives thereof; The heat stabilizer is selected from at least one of calcium salts, zinc salts and magnesium salts of stearic acid, oleic acid, linoleic acid, palmitic acid, linolenic acid, myristic acid, lauric acid and palmitic acid; The oxygen stabilizer is selected from at least one of hindered phenols, phosphites, thioesters and their derivatives; The weight ratio of the light stabilizer, the heat stabilizer and the oxygen stabilizer is 1:(0.5-2):(0.5-2).

3. The impact-resistant and aging-resistant polycarbonate composition according to claim 1, characterized in that: The anti-hydrolysis agent is selected from at least one of N,N'-diphenylcarbodiimide, N,N'-dicyclohexylcarbodiimide and polycarbodiimide.

4. The impact-resistant and aging-resistant polycarbonate composition according to claim 1, characterized in that: The compatibilizer and toughener is selected from at least one of maleic anhydride graft copolymers of polyethylene, polypropylene, poly(ethylene / propylene), poly(ethylene / octene), poly(ethylene / vinyl acetate), and poly(ethylene / acrylate); The maleic anhydride grafting rate of each of the above graft copolymers is 0.5-10%.

5. The impact-resistant and aging-resistant polycarbonate composition according to claim 1, characterized in that: The compatibilizer and toughener may also be selected from at least one of ethylene / maleic anhydride copolymer, propylene / maleic anhydride copolymer, ethylene / propylene / maleic anhydride copolymer, ethylene / octene / maleic anhydride copolymer, ethylene / vinyl acetate / maleic anhydride copolymer, and ethylene / acrylate / maleic anhydride copolymer; The mass percentage of maleic anhydride in the above copolymers is 1-20%.

6. The impact-resistant and aging-resistant polycarbonate composition according to claim 1, characterized in that: The flame retardant includes at least one of triphenyl phosphate, triisopropylphenyl phosphate, bisphenol A bis(diphenyl phosphate), bisphenol A bis(diisopropylphenyl phosphate), resorcinol bis(diphenyl phosphate), and resorcinol bis(diisopropylphenyl phosphate).

7. The impact-resistant and aging-resistant polycarbonate composition according to claim 1, characterized in that: The other additives include reinforcing agents, plasticizers, and release agents; The reinforcing agent is selected from at least one of talc, mica, wollastonite, glass microspheres, glass fiber, carbon fiber, and graphene; The plasticizer is selected from at least one of dibutyl phthalate, dioctyl phthalate and diphenyl phthalate; The release agent is selected from at least one of silicone oil, carbon tetrachloride and white oil.

8. A method for preparing the impact-resistant and aging-resistant polycarbonate composition according to any one of claims 1 to 7, comprising the following steps: (i) blending the light stabilizer, heat stabilizer and oxygen stabilizer in proportion, and then extruding the compatibilizer and toughener with the compatibilizer and toughener through a twin-screw melt processing to obtain a compatibilizer and toughener masterbatch; (ii) blending the compatibilizing and toughening stabilizer masterbatch with polycarbonate, anti-hydrolysis agent, flame retardant and other additives, and then extruding the mixture through a twin-screw melt processing to obtain the impact-resistant and aging-resistant polycarbonate composition.

9. The method for preparing the impact-resistant and aging-resistant polycarbonate composition according to claim 8, characterized in that: The processing temperature of the compatibilizing and toughening stabilizer masterbatch is 120-180°C, and the screw speed is 200-800 rpm; The processing temperature of the impact-resistant and aging-resistant polycarbonate composition is 250-280° C., and the screw speed is 200-800 rpm.

10. Use of the impact-resistant and aging-resistant polycarbonate composition according to any one of claims 1 to 7, in but not limited to the fields of home appliances, electronics, automobiles, and base stations.

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