A kind of halogen-free flame-retardant PBT/PP-based wood-plastic composite material and preparation method thereof

Abstract

The present invention involves the technology field of wood plastic composite materials, which specifically involves a kind of halogen -free PBT / PP base wood plastic composite material and its preparation method.20 to 30 parts of diol ester, 10‑20 part of polypropylene, 28‑35 copies of melamine formaldehyde resin modified plant fiber, 23 copies of ammonium -type polyphosphate, 1‑3 parts of 4A molecular sieve, Malaysic acid anhydrialsPolymide 4‑8 copies, 2‑3 parts of lubricants, 0.2‑0.5 copies of antioxidants and 0.2‑0.5 parts of light stabilizer.The wooden plastic composite material of the present invention has high mechanical strength. The 1.6mm thick -sample strips vertical combustion pass through UL‑94V‑ 0, the stretching strength reaches 36.3MPa, the curved strength reaches 48.8MPa, and the thermal deformation temperature is 144.8 ° C.As high as 120 ° C.

Description

technical field [0001] The invention relates to the technical field of wood-plastic composite materials, in particular to a halogen-free flame-retardant PBT / PP-based wood-plastic composite material and a preparation method thereof. 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 chloride, etc. However,...

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 high-mechanical performance halogen-free flame-retardant PBT composite material. Melamine phosphate and high-temperature-treated phosphinate are compounded for flame retardancy; 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-0@1.6mm, the flame retardant effect is good, but the flame retardant system used is expensive , the cost of flame retardant is 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.