Polycarbonate composition and preparation method thereof

Abstract

The invention provides a polycarbonate composition and a preparation method thereof. The polycarbonate composition comprises 30-90% of polycarbonate, 5-50% of polyester, 1-10% of compatible toughening agents, 1-10% of low-temperature impact modifiers, 0.1-1% of anti-ultraviolet assistant, 0.1-2% of antioxidants and 0.1-1% of lubricant by mass. The preparation method comprises the following steps: weighing the components in the composition according to the mass proportion; throwing the polycarbonate, the polyester, the compatible toughening agents, the low-temperature impact modifiers, the anti-ultraviolet assistant, the antioxidants and the lubricant into a mixer to be uniformly mixed; and melting, mixing, extruding and pelleting the uniformly mixed raw materials by an eight-temperature zone double-screw extruder. The polycarbonate composition has high molding processing mobility and excellent chemical reagent resistance, anti-ultraviolet property and low-temperature anti-impact property and can be widely applied to thin-wall workpieces.

Description

technical field [0001] The invention relates to a polycarbonate composition and a preparation method thereof, in particular to a polycarbonate composition resistant to chemical agents, ultraviolet radiation and low-temperature impact and a preparation method thereof. Background technique [0002] Some processing and unconventional use environments have put forward special performance requirements for the applied plastic materials. For example, sometimes it is necessary to re-coat the outer surfaces of the plastic shell and frame. Among them, the coating material with diluent The thinner in the thinner may have a chemical effect on the substrate, and the coating material without adding thinner usually needs ultraviolet light (UV) to cure. In both cases, it will seriously affect the performance of the substrate. There is even a phenomenon that the product bursts. When the product is used in the alpine region, the low-temperature toughness of the material is required, that is,...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, polycarbonate (PC) plastic has the advantages of high transparency, good conventional mechanical properties such as unnotched impact strength at room temperature, heat resistance and creep resistance, and good dimensional stability, so it is widely used The casing and frame of the machine parts used under normal environmental conditions, but its molecular chain rigidity and melt viscosity are large, which can easily cause large residual stress in the product. At the same time, it is resistant to chemical reagents, UV radiation and low temperature impact. Performance, especially poor notched impact resistance at low temperature and poor environmental stress cracking resistance, thus limiting its use in some specific conditions

There have been reports in the literature to improve the modification technology for one or several of the above-mentioned performance shortcomings of PC plastic materials, but comprehensively improve the chemical resistance, UV radiation resistance, low-temperature impact resistance of PC plastic materials, and reduce the residue of products. Stress techniques have not been reported

For example, Chinese patent application publication CN101415750A published on April 22, 2009 discloses a polycarbonate resin with good melt fluidity, but it has the problems of poor chemical resistance and low-temperature impact resistance; in 2009 Chinese patent application publication CN101565538A published on October 28 discloses a halogen-free flame-retardant PC / polyester alloy and its preparation method, which has excellent chemical resistance, but the low-temperature impact resistance of the material is poor; published in 2008 The Chinese patent application publication CN101208388A published on June 25 discloses a polycarbonate resin composition with good molding and processing fluidity, but the low-temperature impact resistance of the material has not been improved, and it cannot meet the requirements of chemical resistance and UV resistance. light exposure requirements

Images