High temperature resistant halogen-free flame retardant used in thermoplastic polyester (TPES) engineering plastics

Abstract

The invention discloses a high temperature resistant halogen-free flame retardant for thermoplastic polyester (TPES) engineering plastics. The halogen-free flame retardant is composed of the following raw materials in mass percentage: 70-100% of dihydroxy alkylphosphinate and 0-30% of nitrogen flame retardant. The high temperature resistant halogen-free flame retardant provided by the invention has the advantages of efficient flame retardance, good processability, excellent mechanical properties, and capability of inhibiting decomposition of a polyester material in the processing course and maintaining color stability of the product. When the halogen-free flame retardant is applied to the glass-fiber reinforced TPES engineering plastics, the flame retardant can reach the flame retardant grade UL94V0 and maintain good mechanical properties, good electrical properties and good color stability, and meanwhile the flame retardant is halogen-free and environmentally-friendly.

Description

technical field [0001] The invention relates to a high-temperature-resistant halogen-free flame retardant for thermoplastic polyester engineering plastics. Background technique [0002] Thermoplastic polyester resin is a polymer formed by the polymerization of saturated dibasic acid and saturated diol. It belongs to a type of linear thermoplastic resin. The fifth largest engineering plastics after ether. At present, the thermoplastic polyester engineering plastics that have been industrially produced and widely used are polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), which are modified by glass fiber or mineral reinforcement. With excellent mechanical properties, electrical properties and heat resistance, it is widely used in automobiles, connectors, coil bobbins, electrical casings and other electronic and electrical components. The global fire protection requirements are becoming more and more stringent, especially in the electronics / electrical app...

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Problems solved by technology

U.S. Patent US20080090950 proposes inorganic hypophosphite such as aluminum hypophosphite, calcium hypophosphite and other compound nitrogen-containing compound flame-retardant glass fiber reinforced polyester materials, the flammability of which passes UL94V-0 level / 0.8mm, but the thermal decomposition temperature of the composition Below 280°C, it is easy to decompose during processing and molding, resulting in discoloration of polyester materials, especially in PET or PET / PBT alloy polyester materials, which not only affects the appearance of the product, but also reduces the mechanical and electrical properties of the product , in addition, aluminum hypophosphite contains active phosphorus-hydroxyl bonds, which is easy to generate phosphine at high temperature, so that aluminum hypophosphite is prone to fire or dust explosion during high-mix processing, and the safety is not high; US6255371 B1 proposes diethyl hypophosphite Aluminum phosphonate compounded with nitrogen-containing compounds is a flame-retardant glass fiber reinforced polyester material, and the flame retardancy of a 0.8mm thick sample reaches UL 94V-0 level, but this type of product is expensive and not cost-effective

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