Bio-based wood-plastic composite and preparation method thereof

Abstract

The invention discloses a bio-based wood-plastic composite prepared from the following raw materials in parts by weight: 50-60 parts of PLA resin, 100-120 parts of dichloromethane, 15-20 parts of modified lignin, 8-12 parts of modified filler, 1-2 parts of flame retardant, 1-2 parts of antioxidant, 0.5-0.8 part of lubricant, 0.3-0.5 part of stabilizer and 0.1-0.2 part of processing aid. The invention further discloses a preparation method of the bio-based wood-plastic composite. The bio-based wood-plastic composite disclosed by the invention is prepared by taking PLA and modified lignin as matrixes of the composite, so that the dispersion of the lignin in PLA can be effectively improved, and the mechanical properties and ultraviolet resistance of the composite can be improved; due to the addition of the flame retardant compounded by ammonium polyphosphate and aluminum diethylhypophosphite into the composite, the composite has extremely high flame retardant efficiency; and the preparation method disclosed by the invention is simple and easy to process, and the obtained bio-based wood-plastic composite is high in comprehensive performance, easy to biodegrade and wide in market prospect.

Description

technical field [0001] The invention belongs to the technical field of wood-plastic composite materials, and in particular relates to a bio-based wood-plastic composite material and a preparation method thereof. Background technique [0002] Wood-plastic composites (Wood-Plastic Composites, WPC) 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 and polyvinyl chloride, etc. It is a board or profile produced by mixing waste plant wood fibers such as powder, rice husk, and straw into new wood materials, and then undergoing plastic processing processes such as extrusion, molding, and injection molding. The production and use of wood-plastic composite materials will not emit volatiles that endanger human health to the surrounding environment. It has the advantages of no cracking, no deformation, corrosion resistance, no pollution, and no pollution. It can be recycled and is a brand new...

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Problems solved by technology

[0003] However, the current wood-plastic materials still have certain defects: the aging resistance is not enough: the PVC wood-plastic composite products developed in the market are mainly used indoors, and less used outdoors

Since PVC is easy to decompose under strong light and heat conditions, the ozone resistance, water resistance and weather resistance of PVC wood plastic are not high.

Outdoor building materials generally use PE wood-plastic and PP wood-plastic. PE wood-plastic has poor anti-oxidation and anti-light decomposition capabilities, and the effect of adding antioxidants is not ideal, so the strength and color fastness of the product are also very poor. , the outdoor service life of the product is limited; the heat resistance is not good, and the buckling is easy to change when heated; the toughness is not good: the toughness of wood-plastic is lower than that of plastic matrix or resin, so when processing, processing equipment or molds need to be adjusted and modified accordingly. Meet the processing requirements; flammable: wood-plastic composite materials are flammable materials, which limits the scope of application of the product; the bonding force between hydrophilic wood powder (such as wood fiber) and hydrophobic plastic is very small, resulting in products The mechanical strength of wood-plastic composites is low, the tensile strength and bending strength of wood-plastic composites are smaller than those of unfilled plastics, the brittleness is greater than that of unfilled plastics, and the impact strength is correspondingly reduced, and its density is generally higher than that of pure plastics and wood. high

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