Halogen-free flame-retardant cold-resistant polycarbonate alloy and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant cold-resistant polycarbonate alloy which comprises the following components in parts by weight: 75-93 parts of PC resin, 5-10 parts of a cold-resistant toughening agent, 1.1-5.5 parts of a flame retardant, 0.5-5 parts of a synergistic flame retardant, 0.4-2 parts of an antioxidant, 0.2-0.5 part of an ultraviolet light absorber, and 0.2-0.6 part of an anti-dripping agent. The product disclosed by the invention has good flame retardancy, the flame retardancy of a sample strip with the thickness of 1.5 mm / 3.0 mm reaches the UL94V-0 level, the use of polytetrafluoroethylene can prevent the melting and dripping of the product and can improve the flame retardancy of the product, the fire retardant consumption is reduced to further ensure that the flame retardancy of the product reaches the UL94V-0 level, the production cost of the product is reduced, and the competitiveness of the product is improved; besides, other mechanical properties of the product are not affected in case of higher impact strength, and the overall performance is excellent; the product has the characteristics of good low temperature resistance and good processing property. The alloy material is applicable to the fields of industry, communications and transport, military industry, aerospace and the like.

Description

technical field [0001] The invention relates to the field of flame-retardant polymer materials, in particular to a halogen-free flame-retardant and cold-resistant polycarbonate alloy, and also relates to a preparation method of the halogen-free flame-resistant and cold-resistant polycarbonate alloy. Background technique [0002] Polycarbonate PC is a polymer with carbonate bonds in the main chain. According to the different ester group structures, it can be divided into aliphatic, aromatic, aliphatic-aromatic and other types. At present, the most widely used is aromatic, which has obtained industrialized production. Aromatic polycarbonate has the characteristics of excellent optical properties, good dimensional stability, high mechanical strength, good toughness and excellent impact strength, and has become the fastest growing general engineering plastic among the five major engineering plastics. [0003] With the improvement of people's living standards and safety awarenes...

AI Technical Summary

Problems solved by technology

[0003]With the improvement of people's living standards and safety awareness, people pay more and more attention to the flame retardancy of products. Although aromatic polycarbonate has the above-mentioned However, its flame retardancy is poor. Although unmodified aromatic polycarbonate has certain flame retardancy, its UL 94 only reaches V-2 or HB level, and its oxygen index is generally 24~28, which cannot meet the requirements of flame retardancy. places with severe fuel requirements

In addition, the molecular chain of aromatic polycarbonate has high rigidity, poor processing fluidity, and is prone to stress cracking, which seriously affects the quality of the product. At the same time, the glass transition temperature of aromatic polycarbonate is relatively high, generally about 150°C. In the environment, its mechanical properties are poor, especially the impact performance is greatly reduced, which seriously affects its use in occasions with high requirements for low temperature impact.