A kind of PC alloy with high hardness, high transparency and high fluidity and preparation method thereof

Abstract

The invention belongs to the technical field of high molecular alloy materials, and particularly relates to a high-hardness high-transparency high-flowability PC (polycarbonate) alloy and a preparation method thereof. The PC alloy comprises the following components in parts by weight: 80-95 parts of PC resin, 10-20 parts of PS (poly styrene), 6-10 parts of transparent toughener, 1-5 parts of SMA (styrene maleic anhydride) random copolymer, 0.06-0.1 part of transparent PC halogen-free flame retardant, 0.2-2 parts of main antioxidant, 0.2-2 parts of auxiliary antioxidant and 0.2-1 part of silane coupling agent. Alternatively, the PC alloy comprises the following components in parts by weight: 80-95 parts of PC resin, 6-10 parts of transparent toughener, 10-20 parts of SMA random copolymer, 0.06-0.1 part of transparent PC halogen-free flame retardant, 0.2-2 parts of main antioxidant, 0.2-2 parts of auxiliary antioxidant and 0.2-1 part of silane coupling agent. According to the invention, the PC alloy material is prepared through a melt blending method, the preparation method is convenient, the technological operation is easy to realize, the cost is low, and the period is short; and the surface hardness and flowability of the alloy are simultaneously improved under the condition of keeping high transparency, so that the alloy has excellent physical and chemical properties on the whole. Thus, the invention is suitable for popularization.

Description

technical field [0001] The invention belongs to the technical field of polymer alloy materials, and in particular relates to a high-hardness, high-transparency, and high-fluidity PC alloy and a preparation method thereof. Background technique [0002] As a kind of engineering plastic, polycarbonate (PC) resin has good transparency, good light stability, good dimensional stability, and good toughness, but the hardness of pure PC is low, and the measured pencil hardness is generally 2B. Existing solutions The method is to apply a layer of nano-coating on the surface of PC to increase the hardness of PC, which can reach F-H level. This method has complicated procedures and troublesome operation. Moreover, PC is sensitive to gaps, and the product has high internal stress, high melt viscosity, and difficult molding. The wear resistance is poor, and its application is limited. [0003] Ordinary polystyrene has extremely high transparency, light transmittance can reach more than 9...

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Problems solved by technology

[0002] As a kind of engineering plastic, polycarbonate (PC) resin has good transparency, good light stability, good dimensional stability, and good toughness, but the hardness of pure PC is low, and the measured pencil hardness is generally 2B. Existing solutions The method is to apply a layer of nano-coating on the surface of PC to increase the hardness of PC, which can reach F-H level. This method has complicated procedures and troublesome operation. Moreover, PC is sensitive to gaps, and the product has high internal stress, high melt viscosity, and difficult molding. Poor wear resistance, its application is limited

[0003] Ordinary polystyrene has extremely high transparency, light transmittance can reach more than 90%, good processing fluidity, good rigidity and good chemical corrosion resistance, and is often used as a modified material. Chinese patent CN 101531809 B provides a polycarbonate The preparation method of ester PC-polystyrene PS blended alloy, PC, PS and SiO 2 After coating the polymer, the TiO 2 with SiO 2 Coating is carried out to obtain inorganic particles, and then the high polymer and inorganic particles are melted again to obtain a blended alloy. The prepared alloy has better UV resistance and wear resistance, and the melt viscosity is reduced, which improves the optical properties of the alloy. Performance and mechanical properties, the light transmittance can reach 76%, the notched impact strength is 4.0kg cm, but SiO 2 The addition of nano-TiO will also reduce the light transmittance, and the color difference and yellowing value will be higher. Nano-TiO 2 / SiO 2 The powder requires a separate preparation process, which is cumbersome to operate and the steps are cumbersome, and the light transmittance is still low, and the problem of surface hardness of the material is not solved; Chinese patent 00124682.8 provides a highly transparent flame-retardant polycarbonate and polycarbonate The ester / polystyrene alloy and its preparation method are prepared by extruding polycarbonate resin, transparent polystyrene resin, flame retardant, light and heat stabilizer, coupling agent and other processing aids in a certain proportion, and the obtained The composite retains the high transparency of ordinary polycarbonate resin, and the light transmittance can reach 82-88%, but the problem of hardness and fluidity has not been solved