Halogen-free flame-retardant polyolefin injection-grade wood-plastic composite and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant polyolefin injection-grade wood-plastic composite and a preparation method thereof. The halogen-free flame-retardant polyolefin injection-grade wood-plastic composite comprises the following components in percentage by mass: 25 to 70 percent of polyolefin resin, 5 to 50 percent of plant fiber, 0.5 to 20 percent of compatilizer, 0 to 30 percent of flexibilizer, 0.5 to 8 percent of dispersant, 5 to 40 percent of fire retardant and synergist and 0 to 1 percent of antioxidant. Compared with the conventional wood-plastic composite, the halogen-free flame-retardant polyolefin injection-grade wood-plastic composite prepared by the invention has the characteristics of simple production flow, less fire retardant dosage, good halogen-free flame-retardant effect, wide molding mode range and the like, and is suitable for various injection-molded products such as shells of electrical appliance products, furniture, materials for automobiles, artworks, building products with complex construction and the like.

Description

technical field [0001] The invention relates to a wood-plastic composite material preparation process and its application field, in particular to a polyolefin halogen-free flame-retardant injection molding-grade wood-plastic composite material. Background technique [0002] Wood-plastic composite material is a new type of environmentally friendly material prepared by using plant fiber and thermoplastic resin as the main raw materials and adding certain processing aids. This material can alleviate the consumption of petroleum, and at the same time, a large amount of waste plant fibers and recycled plastics are used, which can not only alleviate the consumption of petroleum resources in modern society, but also reduce the consumption of wood resources. It is an effective means to protect the environment and reduce energy consumption. [0003] In view of the many advantages of wood-plastic composite materials, its market has grown rapidly in recent years, especially in interior...

AI Technical Summary

Problems solved by technology

Therefore, it is an inevitable trend to research and develop halogen-free flame-retardant wood-plastic composite materials. Chinese patent application 200610039985.4 discloses a flame-retardant wood-plastic composite material and its preparation method, using intumescent flame retardant ammonium polyphosphate and carbon forming agent Flame-retardant modification of polypropylene or polyethylene-based wood-plastic composite materials with foaming agents, etc., but there are disadvantages such as large amount of flame retardants, ammonium polyphosphate is easy to decompose at processing temperature, and the product is easy to absorb moisture; Chinese patent application 200710072794.2 discloses a flame-retardant and smoke-suppressing wood-plastic composite material, which also uses intumescent flame retardant ammonium polyphosphate, starch, etc. to modify polystyrene or polyvinyl chloride, and still exists as an intumescent flame retardant The above shortcomings; in addition, Chinese patent application 200710173607.X discloses a halogen-free flame-retardant wood-plastic composite material and its preparation method. Soak the cellulose material after the agent, and then prepare the halogen-free flame-retardant wood-plastic composite material, because it still uses the intumescent flame retardant, and the step of processing the fiber is added separately, so its practicability is greatly reduced

[0005] In addition, the existing wood-plastic preparation technology is mainly based on extrusion molding, hot pressing molding and extrusion molding technology, which are mainly used for the production of plate products. The injection molding parts with complex molding structures are greatly restricted. The main problem is It is due to the poor fluidity of the wood-plastic composite material with a large amount of wood powder, the low strength of the part, and the poor appearance quality

Although Chinese patent application 200710020012.7 discloses injection molding grade wood-plastic composite material and processing technology, the melt flow rate range of the wood-plastic composite material prepared by it is only 0.3-1.0g / 10min, and can only be used for polypropylene, high Density polyethylene or polyvinyl chloride, its practical application range is very limited