Polycarbonate composition and preparation method thereof

Abstract

The invention discloses a polycarbonate composition and a preparation method thereof, and belongs to the technical field of high polymer materials. According to the product, PC and PBT are compounded to serve as a matrix resin system, meanwhile, the triazine light stabilizer and the compound stabilizer are introduced to serve as functional components, good UVC irradiation resistance can be achieved, meanwhile, good impact strength and electrical performance are achieved, and durability can be guaranteed when the product is applied to medical products.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a polycarbonate composition and a preparation method thereof. Background Art

[0002] In the medical industry, UVC radiation disinfection is more efficient and environmentally friendly than traditional high-temperature disinfection or alcohol disinfection. It mainly relies on ultraviolet rays with a wavelength of 200-275nm, especially 250-270nm, to destroy the DNA or RNA structure of microorganisms to achieve the disinfection function. However, the current UVC radiation disinfection objects are very limited, because compared with visible light, UVC has a higher degree of photoaging, especially some degradable organic substances used in the medical field, such as polycarbonate, which have a high degree of radiation degradation under the action of UVC, resulting in obvious color difference in appearance. At the same time, as medical supplies, degradable organic substances are expected to achieve better mechanical strength, flame retardancy and solvent resistance, to avoid damage caused by external force or combustion during use, and ultimately cause safety accidents. At the same time, there will be no damage problems after being disinfected by immersion in various solvents (such as alcohol immersion). Summary of the invention

[0003] Based on the defects of the prior art, the purpose of the present invention is to provide a PC / PBT composition, which uses a compound of PC and PBT as a base resin system, and introduces a triazine light stabilizer and a composite stabilizer as functional components, which can not only achieve good UVC radiation resistance, but also has good impact strength and electrical properties, and can ensure durability when used in medical products.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A PC / PBT composition comprising the following components in parts by weight:

[0006] 50-80 parts of PC resin, 5-20 parts of PBT resin, 5-15 parts of flame retardant, 3-8 parts of toughening agent, 0.05-3 parts of light stabilizer, 0.1-2 parts of composite stabilizer;

[0007] The light stabilizer is a triazine light stabilizer;

[0008] The composite stabilizer comprises ethylene / methacrylic acid copolymer partially neutralized with metal ions and glycidyl acrylate grafted polypropylene.

[0009] Although PC resin has advantages such as good processing performance and good electrical insulation, it has poor degradation resistance and poor resistance to high temperature deformation. Compounding PBT resin with PC resin can improve the surface hardness of the overall product, thereby achieving better rigidity and toughness. The crack resistance after degradation by external factors can also be significantly improved. However, PC / PBT composite materials still have many defects: (1) In order to make the product have better flame retardant properties and toughness, flame retardants and toughening agents are generally introduced into the product. However, the compatibility of PC / PBT matrix resin with these functional additives is not ideal, resulting in difficulty in achieving high dispersion and high stability of these components in the product. It is easy to cause component migration during processing or use, and it is difficult for the product to achieve a high level of flame retardant performance and toughness strength; (2) Affected by the characteristics of PC resin, the product has low resistance to light degradation and solvent degradation. After long-term irradiation, especially UVC irradiation, the product appearance is prone to obvious color difference, and may even crack after solvent immersion.

[0010] To this end, in the technical solution of the present invention, the PC / PBT composition introduces two special stabilizers into the matrix resin, wherein the triazine light stabilizer itself has a light absorption intensity of more than 18% at 254nm, and after being introduced into the product, high light resistance, especially UVC radiation effect, can be achieved, and the UVC radiation resistance of the product can be improved. In the composite stabilizer, the glycidyl acrylate grafted polypropylene has a GMA group, which can react with the end group of the PC resin, thereby improving the compatibility of the PC resin with each component; the ethylene / methacrylic acid copolymer partially neutralized by metal ions can greatly improve the solvent resistance of the overall product based on the ethylene / methacrylic acid group, and can also coordinate the light stabilizer to reduce the absorption efficiency of the product to external light. At the same time, based on its weak acidity, it can also stabilize the impurity components in the product, inhibit the side reactions caused by its activation by external factors, and can also work with glycidyl acrylate grafted polypropylene to play a polyester end-capping effect, reducing the degradation reaction of the matrix resin in a solvent environment. In addition, the composite stabilizer can also improve the toughness strength of the product to a certain extent and act as a lubricant, improve the dispersion uniformity of each component of the product during processing, and achieve better initial performance.

[0011] Preferably, in the PC / PBT composition, the total mass content of the PC resin and the PBT resin is ≥ 60%, more preferably 80%.

[0012] The PC / PBT composition product of the present invention can achieve the expected technical effect by introducing a relatively small amount of functional additives. The controllability and operability of the PC / PBT composition product when applied to subsequent processing by those skilled in the art are better. Meanwhile, the PC / PBT composition of the present invention is not limited to the types and contents of the above-mentioned functional additive components. Without affecting the technical effect of the product, those skilled in the art may also introduce other common PC or PBT product additives according to actual needs.

[0013] Preferably, in the PC / PBT composition, the weight percentage of the PC resin is 50 parts, 55 parts, 58 parts, 60 parts, 62 parts, 65 parts, 68 parts, 70 parts, 75 parts, 80 parts or any two of the range values, more preferably 60-70 parts; the weight percentage of the PBT resin is 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts or any two of the range values, more preferably 8-15 parts; the weight percentage of the light stabilizer is The weight proportion of the composite stabilizer is 0.05, 0.1, 0.2, 0.5, 0.8, 1, 1.2, 1.5, 1.8, 2, 2.5, or 3 parts, or any two of the range values, and more preferably 0.1 to 0.2 parts. The weight proportion of the composite stabilizer is 0.1, 0.2, 0.5, 0.8, 1, 1.2, 1.5, 1.8, or 2 parts, or any two of the range values, and more preferably 0.2 to 0.5 parts.

[0014] Preferably, the PC resin has a melt flow rate of 5 to 30 g / 10 min at 300° C. and a load of 1.2 kg according to ISO 1133-2-2011.

[0015] More preferably, the PC resin is bisphenol A type PC resin.

[0016] Preferably, the PBT resin has a melt flow rate of 30 to 65 g / 10 min at 250° C. and a load of 2.16 kg according to ISO 1133-2-2011.

[0017] Preferably, the triazine light stabilizer includes at least one of hydroxyphenyl triazine, methylphenyl triazine and ethyloxy triazine.

[0018] Specifically, the triazine light stabilizer includes at least one of 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxy-phenol and / or its derivatives, 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine-2-yl)-5-octyloxyphenol and / or its derivatives.

[0019] Preferably, the melt flow rate of the glycidyl acrylate grafted polypropylene at 260° C. and 2.16 kg load is 10 to 85 g / 10 min according to ISO1133-2011;

[0020] More preferably, the melt flow rate of the glycidyl acrylate grafted polypropylene at 260° C. and a load of 2.16 kg is 30 to 50 g / 10 min.

[0021] The melt fluidity of glycidyl acrylate grafted polypropylene will affect its dispersibility in the product and the degree of modification effect on PC resin. When the melt flow rate of glycidyl acrylate grafted polypropylene is preferably within the above range, the product has better stability and better UVC radiation resistance.

[0022] Preferably, the grafting rate of glycidyl acrylate grafted onto polypropylene is 0.05 to 3%;

[0023] More preferably, the grafting rate of the glycidyl acrylate grafted onto polypropylene is 0.7-1.2%.

[0024] The glycidyl acrylate group reacts with the terminal hydroxyl group of the PC resin to help the product achieve component compatibility and UVC radiation resistance. When the grafting rate of glycidyl acrylate grafted polypropylene is preferably within the above range, the comprehensive performance of the product is better.

[0025] The grafting rate of the glycidyl acrylate grafted polypropylene can be determined by infrared spectroscopy: a sample of fixed thickness is tested by a Fourier infrared spectrometer to obtain characteristic absorption peaks of the infrared spectrum, and the grafting rate can be calculated by comparing the ratio of the epoxy group absorption intensity.

[0026] It should be noted that the glycidyl acrylate grafted polypropylene of the present invention can be obtained by a homemade method, or can be directly used from a commercial product. When homemade is selected, the following method can be used for preparation:

[0027] The glycidyl acrylate grafted polypropylene is obtained by melt-extrusion grafting glycidyl acrylate as a monomer with polypropylene resin.

[0028] That is, the component can be obtained by grafting glycidyl acrylate and polypropylene resin through melt extrusion.

[0029] Specifically, the mass ratio of the glycidyl acrylate to the polypropylene resin is (1-2.5):(97.5-100).

[0030] Specifically, the melt extrusion grafting process can be directly carried out using a screw extruder. Specifically, the screw extruder is set to a target temperature, and then glycidyl acrylate and polypropylene resin are added to the feed port and mixed, and melt extrusion grafting is performed to obtain the product.

[0031] Specifically, the temperature of the melt extrusion grafting is ≥190°C.

[0032] More specifically, the polypropylene resin has a melt flow rate of 10 to 90 g / 10 min at 260° C. and a load of 2.16 kg according to ISO 1133-2011.

[0033] Preferably, the metal ion partially neutralized ethylene / methacrylic acid copolymer comprises at least one of a zinc ion partially neutralized ethylene / methacrylic acid copolymer and a sodium ion partially neutralized ethylene / methacrylic acid copolymer.

[0034] Preferably, the metal ion partially neutralized ethylene / methacrylic acid copolymer has a melt index of 0.5 to 5.5 g / 10 min at 260° C. and a load of 2.16 kg according to ISO 1133-2012.

[0035] More preferably, the metal ion partially neutralized ethylene / methacrylic acid copolymer is a zinc ion partially neutralized ethylene / methacrylic acid copolymer.

[0036] When ethylene / methacrylic acid copolymer partially neutralized with zinc ions is selected as a composite stabilizer component to prepare a product, it can not only provide the product with better toughness and strength, but also have a higher degree of stability for the product and better synergy with the light stabilizer, thereby reducing the color difference of the product after UVC irradiation.

[0037] Preferably, in the composite stabilizer, the mass ratio of glycidyl acrylate grafted polypropylene to the ethylene / methacrylic acid copolymer partially neutralized with metal ions is (1.5-3.5):1.

[0038] As a compound component that synergistically improves the performance of the product, when the relative addition amount of glycidyl acrylate grafted polypropylene is larger, the comprehensive performance of the product is better, especially when the two components are preferably within the above range, the product's UVC radiation resistance is better.

[0039] Preferably, the PC / PBT composition further comprises 0.1 to 5 parts of a functional aid or a processing aid;

[0040] Further preferably, the functional additives include but are not limited to at least one of an anti-dripping agent, an antistatic agent, and an antibacterial agent, and the processing aids include at least one of a chain extender, a lubricant, and a release agent. The technicians in this field can add various functional additives or processing aids according to actual needs without affecting the expected performance of the product of the present invention. For example, in order to make the product have antistatic properties during application, the technicians in this field can add an antistatic agent to the product; in order to make the product have a better demolding effect during processing, the technicians in this field can add a small amount of lubricant or release agent to the product for lubrication.

[0041] Another object of the present invention is to provide a method for preparing the PC / PBT composition, comprising the following steps:

[0042] The components are added into a screw extruder for melt extrusion and granulation to obtain the PC / PBT composition.

[0043] Preferably, the temperature zones of the screw extruder are set to 270-290°C in zone 1, 270-290°C in zone 2, 280-260°C in zone 3, 280-260°C in zone 4, 280-260°C in zone 5, 270-260°C in zone 6, 270-260°C in zone 7, 265-250°C in zone 8, 260-240°C in zone 9, and 260-240°C in zone 10, the screw speed is 300-500rpm, and the screw aspect ratio is (45-50):1.

[0044] The preparation method of the PC / PBT composition of the present invention is simple, has low requirements on equipment, and can realize industrial-scale production.

[0045] Another object of the present invention is to provide application of the PC / PBT composition in the preparation of medical supplies.

[0046] More preferably, the medical supplies include medical device housings, wearable medical devices, injection systems, and surgical peripheral parts.

[0047] Another object of the present invention is to provide a medical product comprising the PC / PBT composition of the present invention.

[0048] The PC / PBT composition of the present invention can achieve not only good UVC radiation resistance but also excellent mechanical impact resistance, thin-wall flame retardancy and solvent resistance based on the use of specific light stabilizers and composite stabilizers, and is very suitable for medical supplies with high requirements for these properties.

[0049] The beneficial effect of the present invention is that the present invention provides a PC / PBT composition, which uses a compound of PC and PBT as a matrix resin system, and introduces a triazine light stabilizer and a composite stabilizer as functional components, which can not only achieve good UVC radiation resistance, but also has good impact strength and electrical properties, and can ensure durability when used in medical products. DETAILED DESCRIPTION

[0050] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments and comparative examples, the purpose of which is to understand the content of the present invention in detail, rather than to limit the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative work premise belong to the protection scope of the present invention. The experimental reagents and instruments involved in the implementation of the present invention, unless otherwise specified, are all commonly used common reagents and instruments.

[0051] Examples 1 to 16

[0052] The PC / PBT composition and the preparation method thereof according to the present invention are described in an embodiment. The components of the PC / PBT composition are shown in Table 1.

[0053] The preparation method of the PC / PBT composition comprises the following steps:

[0054] The components are mixed uniformly, and then melt-extruded and granulated in a twin-screw extruder to obtain the PC / PBT composition.

[0055] When the components are melt-extruded, the temperature zones of the screw extruder are set to 280°C in zone 1, 280°C in zone 2, 270°C in zone 3, 270°C in zone 4, 270°C in zone 5, 265°C in zone 6, 265°C in zone 7, 260°C in zone 8, 250°C in zone 9, and 250°C in zone 10, the screw speed is 500rpm, and the screw aspect ratio is 48:1.

[0056] Comparative Examples 1 to 7

[0057] The difference between the comparative examples and the embodiments is only in the types and proportions of components, as shown in Table 2.

[0058] Among the components described in each embodiment and comparative example,

[0059] The PC resin 1 is PC2100 produced by Wanhua Chemical, and the melt flow rate is 9 g / 10 min at 300° C. and 1.2 kg load;

[0060] The PC resin 2 is PC2200 produced by Wanhua Chemical, and the melt flow rate is 23.5 g / 10 min at 300° C. and 1.2 kg load;

[0061] The PBT resin 1 is 1200-211M produced in Changchun, Taiwan, China, and has a melt flow rate of 35.4 g / 10 min at 250° C. and a load of 2.16 kg;

[0062] The PBT resin 2 is 1100-211M produced in Changchun, Taiwan, China, and has a melt flow rate of 62.8 g / 10 min at 250° C. and a load of 2.16 kg;

[0063] The glycidyl acrylate grafted polypropylene 1 has a grafting rate of 0.8% and a melt flow rate of 25.8 g / 10 min at 260° C. and a load of 2.16 kg. It is a homemade product, and the preparation method is as follows:

[0064] Glycidyl acrylate and polypropylene resin were mixed in a mass ratio of 1:99 and fed into a screw extruder for melt extrusion, and the melt temperature was set to 190° C. The polypropylene resin was EP-548 produced by KINGFA, and the melt flow rate was 20.8 g / 10 min at 260° C. and 2.16 kg load;

[0065] The glycidyl acrylate grafted polypropylene 2 has a grafting rate of 1.00% and a melt flow rate of 22.5 g / 10 min at 260° C. and a load of 2.16 kg. It is a homemade product, and the preparation method is as follows:

[0066] Glycidyl acrylate and polypropylene resin were mixed in a mass ratio of 1.5:98.5 and fed into a screw extruder for melt extrusion, and the melt temperature was set to 190° C. The polypropylene resin was EP-548 produced by KINGFA, and the melt flow rate at 260° C. and 2.16 kg load was 20.8 g / 10 min;

[0067] The glycidyl acrylate grafted polypropylene 3 has a grafting rate of 0.13% and a melt flow rate of 23.8 g / 10 min at 260° C. and a load of 2.16 kg. It is a homemade product, and the preparation method is as follows:

[0068] Glycidyl acrylate and polypropylene resin were mixed in a mass ratio of 1:100 and fed into a screw extruder for melt extrusion, and the melt temperature was set to 190°C; the polypropylene resin was EP-548 produced by KINGFA, and the melt flow rate at 260°C and 2.16kg load was 20.8g / 10min;

[0069] The glycidyl acrylate grafted polypropylene 4 has a grafting rate of 2.33% and a melt flow rate of 18.3 g / 10 min at 260° C. and a load of 2.16 kg. It is a homemade product, and the preparation method is as follows:

[0070] Glycidyl acrylate and polypropylene resin were mixed in a mass ratio of 2.5:97.5 and fed into a screw extruder for melt extrusion, and the melt temperature was set to 190°C; the polypropylene resin was EP-548 produced by KINGFA, and the melt flow rate at 260°C and 2.16kg load was 20.8g / 10min;

[0071] The glycidyl acrylate grafted polypropylene 5 has a grafting rate of 0.75% and a melt flow rate of 24.3 g / 10 min at 260° C. and a load of 2.16 kg. It is a homemade product, and the preparation method is as follows:

[0072] Glycidyl acrylate and polypropylene resin were mixed in a mass ratio of 1:99 and fed into a screw extruder for melt extrusion, and the melt temperature was set to 190° C. The polypropylene resin was Z30S produced by KINGFA, and the melt flow rate at 260° C. and 2.16 kg load was 21.5 g / 10 min;

[0073] The glycidyl acrylate grafted polypropylene 6 has a grafting rate of 0.82% and a melt flow rate of 12.5 g / 10 min at 260° C. and a load of 2.16 kg. The product is a homemade product, and the preparation method is as follows:

[0074] Glycidyl acrylate and polypropylene resin were mixed in a mass ratio of 1:99 and fed into a screw extruder for melt extrusion, and the melt temperature was set to 190° C. The polypropylene resin was T30S produced by KINGFA, and the melt flow rate at 260° C. and 2.16 kg load was 11.8 g / 10 min;

[0075] The glycidyl acrylate grafted polypropylene 7 has a grafting rate of 0.81% and a melt flow rate of 84.8 g / 10 min at 260° C. and a load of 2.16 kg. It is a homemade product, and the preparation method is as follows:

[0076] Glycidyl acrylate and polypropylene resin were mixed in a mass ratio of 1:99 and fed into a screw extruder for melt extrusion, and the melt temperature was set to 190° C. The polypropylene resin was BM610 produced by KINGFA, and the melt flow rate at 260° C. and 2.16 kg load was 83.6 g / 10 min;

[0077] The stabilizer 1 is maleic anhydride grafted polypropylene, with a grafting rate of 0.84% ​​and a melt flow rate of 23.5 g / 10 min at 260° C. and a load of 2.16 kg. It is a homemade product, and the preparation method is as follows:

[0078] Maleic anhydride and polypropylene resin were mixed in a mass ratio of 1:99 and fed into a screw extruder for melt extrusion, with the melt temperature set at 200°C; KINGFA produced EP-548, with a melt flow rate of 20.8 g / 10 min at 260°C and a load of 2.16 kg;

[0079] The stabilizer 2 is AC1125 produced by Dow, ethylene-methyl acrylate copolymer;

[0080] The zinc ion partially neutralized ethylene / methacrylic acid copolymer 1 is Surlyn 9520 produced by Dow Chemical of the United States, and has a melt index of 1.1 g / 10 min at 260° C. and a load of 2.16 kg;

[0081] The zinc ion partially neutralized ethylene / methacrylic acid copolymer 2 is Surlyn 9650 produced by Dow Chemical of the United States, and has a melt index of 5.0 g / 10 min at 260° C. and a load of 2.16 kg;

[0082] The sodium ion partially neutralized ethylene / methacrylic acid copolymer is Surlyn 8920 produced by Dow Chemical of the United States, and has a melt index of 0.9 g / 10 min at 260° C. and a load of 2.16 kg;

[0083] The stabilizer 3 is a sulfur-phosphorus ionic liquid stabilizer DR-S15 produced by Novi Company;

[0084] The stabilizer 4 is a phosphite stabilizer produced by Shandong Linyi Sanfeng, SONOX168;

[0085] The light stabilizer 1 is UV1577 produced by Lianlong, 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxy-phenol, a triazine light stabilizer;

[0086] The light stabilizer 2 is 5577 produced by Qitai, Taiwan, China, a 2 (4,6-diphenyl-1,3,5-triazine-2-yl) -5-hexyloxyphenol derivative, a triazine light stabilizer;

[0087] The light stabilizer 3 is 1164 produced by Lianlong, 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine-2-yl)-5-octyloxyphenol, a triazine light stabilizer;

[0088] The light stabilizer 4 is 3030 produced by BASF, an acrylate light stabilizer;

[0089] The flame retardant is hexaphenoxy cyclotriphosphazene produced by MacLean;

[0090] The toughening agent is S-2130 produced by Mitsubishi Rayon, a silicone rubber toughening agent.

[0091] Unless otherwise specified, the components and raw materials used in the embodiments and comparative examples of the present invention are all commercially available raw materials, and the components and raw materials used in each parallel experiment are all of the same kind.

[0092] Table 1

[0093]

[0094]

[0095] Table 2

[0096]

[0097]

[0098] In order to verify the performance of the PC / PBT composition of the present invention, the products prepared in each embodiment and comparative example were subjected to the following performance tests, and the specific steps are as follows:

[0099] (1) UVC irradiation resistance test: The L / a / b values ​​of each product test sample with a size of 125*13*2 mm were tested using a colorimeter. The number of test sites was 3 and the average value was taken. Subsequently, the parallel samples were irradiated with 253.7 nm (50 W) UVC for 50 h in an environment of 50% relative humidity and 25°C. After that, each sample was subjected to the same test as above, and the color difference ΔE was calculated based on the difference in each value.

[0100] (2) Toughness test: According to ASTM D3768-2011 standard, the drop speed is 2.2 m / s, the thickness of the test specimen is 2.0 mm, and the toughness of the material is judged by the failure form of 10 parallel specimens. If none of the 10 specimens are damaged, it is 100% tough; if ≤ 3 of the 10 specimens are damaged, it is 65% tough; if > 3 and ≤ 7 of the 10 specimens are damaged, it is 35% tough; if > 7 of the 10 specimens are damaged or > 1 of the 10 specimens are crushed, it is brittle.

[0101] (3) Flame retardant grade test: Each example or comparative example product was injection molded into a test sample with a size of 125*13*1 mm, and then placed in an environment of 85° C. and 85% relative humidity for 500 h, and then tested according to the UL94-2023 standard.

[0102] (4) Solvent resistance test: According to GB / T 11547-2008, 125*13*2 mm products were immersed in ethanol at 23±2°C for 1 week, then washed and wiped to observe whether the products were cracked or directly broken.

[0103] The test results are shown in Tables 3 and 4.

[0104] Table 3

[0105]

[0106] Table 4

[0107]

[0108] It can be seen from Table 3 and Table 4 that the PC / PBT composition of the present invention has ideal UVC radiation resistance, and also has high impact resistance, solvent resistance and flame retardancy. Specifically, the color difference of the appearance of the product can be maintained at 4 to 6 after long-term UVC irradiation, and the toughness test of the product all meets the standard, with 100% toughness. All products have passed the solvent resistance test, and the flame retardancy level can still be maintained at V-0 level after wet heat treatment.

[0109] In contrast, the stabilizers in the products of Comparative Examples 1 and 2 were not compounded with ethylene / methacrylic acid copolymer partially neutralized with metal ions and glycidyl acrylate grafted polypropylene. Although the total addition amount was the same, the compounding effect could not be achieved by using them alone. Not only were the UVC radiation resistance poor and the toughness low, but the degree of degradation of the products was high under hot and humid environments and solvent environments, and they all failed to pass the test or meet the standards. Although compounded stabilizers were also used in the products of Comparative Examples 3 to 6, the compounded types were not the types specified by the present invention, and the radiation resistance might even be worse than that of the comparative products using only one stabilizer, and other indicators also failed to meet the standards. In the product of Comparative Example 7, the light stabilizer was replaced with a common acrylic light stabilizer. Although the toughness and flame retardancy were up to standard, the radiation resistance test effect was not as good as that of the example product, and the solvent resistance test results were cracked and did not meet the standards.

[0110] It can be seen from Examples 1 and 4 to 9 that the grafting rate of glycidyl acrylate grafted polypropylene and the melt index of the corresponding polypropylene resin itself will affect the fluidity, and further affect the radiation resistance, toughness and other properties of the product, but are better than the products in the comparative examples.

[0111] At the same time, the difference in metal ions of another key stabilizer, ethylene / methacrylic acid copolymer partially neutralized with metal ions, will also lead to certain differences in the radiation resistance of the product. The ethylene / methacrylic acid copolymer partially neutralized with metal ions neutralized with zinc ions has a better application effect.

[0112] When the total amount of glycidyl acrylate grafted polypropylene and ethylene / methacrylic acid copolymer partially neutralized with metal ions in the composite stabilizer is constant, it can be seen from the comparison between Example 1 and Examples 12 to 14 that when the mass ratio is (1.5 to 3.5): 1, the product has smaller color difference after UVC irradiation and better radiation resistance.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A PC / PBT composition, characterized in that: The composition comprises the following components in parts by weight: 50-80 parts of PC resin, 5-20 parts of PBT resin, 5-15 parts of flame retardant, 3-8 parts of toughening agent, 0.05-3 parts of light stabilizer, 0.1-2 parts of composite stabilizer; The light stabilizer is a triazine light stabilizer; The composite stabilizer comprises ethylene / methacrylic acid copolymer partially neutralized with metal ions and glycidyl acrylate grafted polypropylene.

2. The PC / PBT composition according to claim 1, characterized in that: The PC resin has a melt flow rate of 5 to 30 g / 10 min at 300° C. and a load of 1.2 kg.

3. The PC / PBT composition according to claim 1, characterized in that: The melt flow rate of the PBT resin at 250° C. and a load of 2.16 kg is 30 to 65 g / 10 min.

4. The PC / PBT composition according to claim 1, characterized in that: The triazine light stabilizer includes at least one of hydroxyphenyl triazine, methylphenyl triazine and ethyloxy triazine.

5. The PC / PBT composition according to claim 1, characterized in that: The melt flow rate of the glycidyl acrylate grafted polypropylene at 260° C. and a load of 2.16 kg is 10 to 85 g / 10 min.

6. The PC / PBT composition according to claim 1, characterized in that: The grafting rate of the glycidyl acrylate grafted polypropylene is 0.05-3%.

7. The PC / PBT composition according to claim 1, characterized in that: The metal ion partially neutralized ethylene / methacrylic acid copolymer includes at least one of a zinc ion partially neutralized ethylene / methacrylic acid copolymer and a sodium ion partially neutralized ethylene / methacrylic acid copolymer.

8. The PC / PBT composition according to claim 1, characterized in that: In the composite stabilizer, the mass ratio of glycidyl acrylate grafted polypropylene to the ethylene / methacrylic acid copolymer partially neutralized with metal ions is (1.5-3.5):

1.

9. The method for preparing the PC / PBT composition according to any one of claims 1 to 8, characterized in that: The following steps are involved: The components are added into a screw extruder for melt extrusion and granulation to obtain the PC / PBT composition.

10. A medical product, characterized in that: Comprising the PC / PBT composition according to any one of claims 1 to 8; preferably, the medical supplies include medical device housings, wearable medical devices, injection systems, and surgical peripheral parts.

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