Wood-plastic composite section and preparation method thereof

Abstract

The invention discloses a wood-plastic composite section and a preparation method thereof. The wood-plastic composite section is characterized by comprising a shell and a light material filled in the shell, the shell is made of a wood-plastic composite, and the density of the light material is lower than that of the wood-plastic composite. A shell preparation method includes uniformly mixing raw materials prior to extrusion molding, and the raw materials include plastic, a wood fiber material and a flame retardant. A flame retardant preparation method includes subjecting phosphoric acid and pentaerythritol to first contact reaction for 0.5-5 hours at the temperature of 100-180 DEG C, adding polyether polyol, ammonium polyphosphate and melamine and / or urea into a product obtained by the first contact reaction, and performing second contact reaction for 0.5-4 hours at the temperature of 100-180 DEG C. The section has excellent flame retardance. In addition, the light material is filled in the shell, so that strength of the section is improved on the premise of not increasing the weight of the section greatly.

Description

technical field [0001] The invention relates to a wood-plastic composite profile and a preparation method thereof, in particular to a flame-retardant wood-plastic composite profile filled with light materials and a preparation method thereof. Background technique [0002] The profile is the transition layer between the wall and the window, which can fix and prevent the wall around the window from collapsing. In order to save raw materials and reduce the weight of the profile, the profile is generally made hollow, but this will affect the strength of the profile to a certain extent. [0003] Wood-plastic composite material is a new type of composite material that has been booming at home and abroad in recent years. It refers to the use of polyethylene, polypropylene, polyvinyl chloride, etc., mixed with waste plant fibers such as wood powder, rice husk, straw, etc. to form new wood materials. It is a new type of material produced by extrusion, molding, injection molding and ...

AI Technical Summary

Problems solved by technology

[0004] However, hydrocarbons such as plastics are relatively easy to burn, so that wood-plastic composite materials are also easy to burn. In order to overcome the flammability of wood-plastic composite materials, it is an effective way to endow wood-plastic composite materials with surface flame retardancy, as disclosed in CN101486267A A surface flame-retardant wood-plastic composite material sheet and a preparation method thereof are disclosed. The surface flame-retardant wood-plastic composite material is composed of two layers of whisker-modified plastic layers and plant fiber-reinforced plastic layers, and the two layers of whisker-modified plastic layers There is a plant fiber reinforced plastic layer molded in between, the whisker modified plastic layer is made by mixing and calendering modified basic magnesium sulfate whiskers, plastic particles, etc., and the plant fiber reinforced plastic layer is made by mixing and calendering plastic particles and plant fibers

CN101486267A Wood-plastic composites made by hot pressing or using flame-retardant adhesives on the surface of wood-plastic composites have certain flame-retardant properties, but the operation is relatively cumbersome

[0005] At present, flame retardancy is also given to wood-plastic composite materials by adding flame retardants, for example, halogen-containing flame retardants and phosphorus-containing flame retardants, and the halogen-containing flame retardants include pentabromodiphenyl ether and dibromophenyl glycidyl ether. The phosphorus-containing flame retardants are mainly based on ammonium polyphosphate (such as Exolit AP), based on organic phosphorus compounds (such as Exolit OP) or based on red phosphorus (such as Phosphorus-containing flame retardants such as Exolit RP), but halogen-containing flame retardants have low flame retardant performance, large smoke production and addition, and high toxicity, and phosphorus-containing flame retardants have low flame retardant performance

And it is difficult to mix evenly when the above-mentioned flame retardant is directly mixed with plastics and wood fiber materials to prepare wood-plastic composite materials.

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