Halogen-free flame-retardant wood-plastic composite material and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant wood-plastic composite material and a preparation method thereof. The method comprises mixing and extrusion molding of the raw materials. The raw materials are characterized by comprising plastic, a wood fiber material and a flame retardant. A preparation method of the flame retardant comprises steps of: conducting a first contact reaction on phosphoric acid and pentaerythritol; and adding polyether polyol, ammonium polyphosphate, melamine and / or urea into reaction products from the first contact reaction to conduct a second contact reaction. The halogen-free flame-retardant wood-plastic composite material provided by the invention has good flame retardancy and smoke suppression, improved average ignition time, heat release, smoke production and oxygen index compared with a halogen flame retardant, and no droplet and good flame retardancy. Besides, the halogen free flame-retardant wood-plastic composite material provided by the invention has the appearance of wood, high physical and mechanical properties, wide application range, simple preparation process, and safe and easily available raw materials.

Description

technical field [0001] The invention relates to a preparation method of a halogen-free flame-retardant wood-plastic composite material and the halogen-free flame-retardant wood-plastic composite material prepared by the preparation method. Background technique [0002] 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 other plastic processing techniques. Wood-plastic composite materials have good elastic modulus and physical and mechanical properties comparable to hardwood, such as compression resistance and bending resistance. The surface hardness is 2-5 times that of ordinary wood, and its durability is significantly better than ordinary w...

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Problems solved by technology

[0003] 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

[0004] 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 retardancy, large smoke production and addition, and high toxicity, and phosphorus-containing flame retardants have low flame retardancy

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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