Nitrogen-phosphorus compounded expansive type halogen-free flame retardant as well as application thereof in wood-plastic composite material

Abstract

The invention relates to the technical field of wood-plastic composite materials, and in particular relates to a nitrogen-phosphorus compounded expansive type halogen-free flame retardant as well as application thereof in a wood-plastic composite material. The nitrogen-phosphorus compounded expansive type halogen-free flame retardant comprises the following raw materials in parts by weight: 28-35 parts of melamine-formaldehyde resin modified plant fiber and 18-23 parts of coated ammonium polyphosphate, wherein the melamine-formaldehyde resin modified plant fiber is melamine-formaldehyde resin modified wood dust or melamine-formaldehyde resin modified bamboo powder; the coated ammonium polyphosphate is epoxy resin coated ammonium polyphosphate; the particle size of the coated ammonium polyphosphate is 10-20mu m; the polymerization degree of the coated ammonium polyphosphate is 1000-5000; the phosphorus content of the coated ammonium polyphosphate is greater than or equal to 28%; the nitrogen content of the coated ammonium polyphosphate is greater than or equal to 14%. The nitrogen-phosphorus compounded expansive type halogen-free flame retardant is good in flame retardancy effect, free of halogen and particularly applicable to preparation of wood-plastic composite materials.

Description

technical field [0001] The invention relates to the technical field of wood-plastic composite materials, in particular to a nitrogen-phosphorus compound expansion type halogen-free flame retardant and its application in wood-plastic composite materials. Background technique [0002] Plant fibers such as wood powder and bamboo powder have the advantages of high specific strength, large specific surface area, low density, less wear and tear on equipment, and are renewable and biodegradable. After proper treatment, they can be compounded with thermoplastics to obtain high performance and high Value-added green and environmentally friendly wood-plastic composite materials. Wood powder, bamboo powder and other plant fibers have a relatively low thermal decomposition temperature, and generally start to decompose at 150-200 ° C. At present, most of them use thermoplastic general-purpose plastics with low processing temperatures such as polyethylene, polypropylene (PP), polyvinyl ch...

AI Technical Summary

Problems solved by technology

Melamine phosphate, phosphinate, etc. have a good flame-retardant effect on PBT. The Chinese invention patent with the patent number ZL200810089638.1 discloses a preparation method of a halogen-free flame-retardant PBT composite material with high mechanical properties. Compound flame retardant of melamine phosphate and phosphinate after high temperature treatment; Chinese invention patent No. ZL201210410982.2 discloses a flame retardant chain extended polybutylene terephthalate composition and its preparation method , the patent uses aluminum diethylphosphinate and epoxy polysiloxane with side groups to make the flame retardant performance of PBT reach UL94V-01.6mm, and the flame retardant effect is good, but the flame retardant system used is expensive and has a Fuel costs are very high

[0005] To sum up, the existing wood-plastic composite materials basically use general-purpose plastics such as polyethylene, polypropylene, and polyvinyl chloride as the matrix, which has low mechanical strength and poor heat resistance, and ammonium polyphosphate is used as a flame retardant without halogen. After that, the mechanical properties and heat resistance are seriously deteriorated, and with PBT engineering plastics as the matrix, it is difficult to obtain high-performance wood-plastic composite materials due to the decomposition of plant fibers such as wood powder and bamboo powder at the processing temperature.