Halogen-free flame-retardant PBT/PP (polybutylece terephthalate/propylene)-based wood plastic composite material and preparation method thereof

Abstract

The invention relates to the technical field of wood plastic composite materials and particularly relates to a halogen-free flame-retardant PBT / PP (polybutylece terephthalate / propylene)-based wood plastic composite material and a preparation method thereof. The wood plastic composite material is prepared from the following raw materials in parts by weight: 20-30 parts of polybutylene terephthalate, 10-20 parts of propylene, 28-35 parts of melamino-formaldehyde modified plant fibers, 18-23 parts of coated ammonium polyphosphate, 1-3 parts of a 4A molecular sieve, 4-8 parts of maleic anhydride grafted polyolefin, 2-3 parts of a lubricant, 0.2-0.5 part of an antioxidant and 0.2-0.5 part of a light stabilizer. The wood plastic composite material provided by the invention is high in mechanical strength, and vertical combustion of a sample bar which is 1.6mm thick passes UL-94V-0 grade, the tensile strength reaches 36.3MPa, the bending strength reaches 48.8MPa, the thermal deformation temperature is 144.8 DEG C, and the long-term using temperature reaches up to 120 DEG C.

Description

Technical field [0001] 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 methods. Background technique [0002] Plant fiber such as wood powder and bamboo powder has the advantages of high strength, large surface area, low density, less wear on equipment, renewable and biodegradable.Add value -added green environmentally friendly wood plastic composite material.The thermal decomposition temperature of plant fibers such as wood powder and bamboo powder is relatively low. Generally, it starts to decompose at 150 ~ 200 ° C. At present, most of the heat plastic plastic plastic with low processing temperatures such as polyethylene, polypropylene (PP), polyvinyl chloride, etc.The composite, but the obtained wood plastic composite materials have the shortcomings of low mechanical strength and poor heat resistance.Thermoplastic plastic...

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.