A low-separation flame-retardant polyamide composition and its preparation method

Abstract

The invention relates to the technical field of a high polymer material and especially relates to a low-temperature flame-retarded polyamide composition, and the composition includes the raw materials based on the following mass percentage: 20-70% of nylon resin, 10-30% of main flame retardant, 0-15% of synergistic agent, 10-40% of alkali-free glass fiber, 0-1% of antioxidant, and 0-2% of lubricant, wherein the nylon resin is one of nylon 66 and nylon 6 or their mixture; the main flame retardant is a brominated flame retardant; the synergistic agent is selected from one of compounds of antimonous oxide master batch, zinc borate, silicon dioxide and metallic oxide or the mixture prepared by more than one compound; the lubricant is a lubricant with high molecular weight and dispersion and includes one of polyethylene wax, modified PE wax, OP wax and lignite wax. The polyamide composition isn't easily migrated or precipitated at high-temperature moisture conditions and low in material cost, the preparation method is simple and beneficial to popularization and application.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a low-separation flame-retardant polyamide composition and a preparation method thereof. Background technique [0002] Bromine antimony composite flame retardant polyamide composite material has excellent flame retardancy, the flame retardant grade reaches UL94 V0 (0.4mm), while maintaining good mechanical properties and mechanical properties, good processing performance, environmental protection, low cost and other excellent comprehensive properties, It has a dominant position in the current flame-retardant nylon market and can meet the needs of electronic appliances, low-voltage switches and other products. [0003] The traditional bromine-antimony composite flame-retardant polyamide composite materials currently on the market mainly use bromine-based flame retardants and antimony trioxide powders to composite flame-retardant polyamides. There is incompatibility betw...

AI Technical Summary

Problems solved by technology

The decabromodiphenylethane used in this patent has a decomposition temperature of about 300°C, and the melt temperature of this material exceeds this temperature due to the existence of shear heat during twin-screw extrusion and injection molding. , causing part of decabromodiphenylethane to decompose into small molecular substances, and these decomposed small molecular substances are easy to migrate to the surface of the product to form a white frost-like substance, which affects the appearance and use of the product

At the same time, light stabilizers and heat stabilizers are small molecular additives, which are easy to precipitate

[0006] Chinese patents CN 101955657 A and CN 103421303 A disclose a kind of environmentally friendly high CTI flame retardant reinforced nylon 6 material. The invention mainly modifies PA6, and the processing temperature of PA66 is higher than that of PA6. Due to the temperature resistance of phosphorus nitrogen composite flame retardant It is not high, so that the phosphorus-nitrogen flame retardant is easily decomposed into small molecular substances during the processing process, thus affecting the high-temperature and high-humidity precipitation performance of the material

The decabromodiphenylethane flame retardant described in Chinese patent CN 102492290 A has low heat resistance and is easy to decompose during processing, resulting in precipitation and yellowing of the material

Similar patents include CN 101503570A, 200610118566.X, 200610028821.1, 201110392827.8 and other patents, all of which are compounded flame-retardant nylon with decabromodiphenylethane and antimony trioxide. The process described is also a traditional process. There is no special treatment, so it is also easy to precipitate in high temperature and humid environment