Bio-based wood-plastic composite material and preparation method

Abstract

The invention discloses a bio-based wood-plastic composite material which is prepared from the following ingredients in parts by weight: 23 to 28 parts of hydroxylation polyethylene resin, 50 to 56 parts of polymer modified bio-based wood fiber, 13 to 16 parts of diisocyanate, 5 to 7 parts of talcum powder and 3 to 5 parts of activated calcium carbonate. According to the bio-based wood-plastic composite material disclosed by the invention, the prepared polymer modified bio-based wood fiber and the hydroxylation polyethylene resin are crosslinked and polymerized through diisocyanate, so that acting force between the wood fiber and the hydroxylation polyethylene resin is enhanced, and the acting force between the wood fiber and the hydroxylation polyethylene resin is prevented from being decreased; the problems that the wood fiber can be easily pulled out of matrix resin under the action of external force to further cause poor mechanical property stability of the wood-plastic material are solved.

Description

technical field [0001] The invention belongs to the field of wood-plastic composite material preparation, and relates to a bio-based wood-plastic composite material and a preparation method thereof. Background technique [0002] Wood-plastic composite material is a new type of green and environmentally friendly composite material. It is a modified material formed by impregnating wood fiber or plant fiber in other polymer monomers or prepolymers and polymerizing through physical and chemical methods. There are a large number of polar functional groups on the surface of wood fibers. In the preparation process of wood-plastic composites, there are a large number of hydroxyl groups in wood fibers with high hydrophilic properties, while the thermoplastic resin matrix is ​​a hydrophobic resin. There is a gap between the two. High interfacial energy is poor, and it is difficult to fully integrate; and because a large number of hydroxyl groups on the surface of wood fibers are easy ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a bio-based wood-plastic composite material and a preparation method thereof. By preparing polymer-modified bio-based wood fibers, the surface of the wood fibers is grafted with a hydrophobic polymer, and the pores on the surface of the wood fibers are filled with the polymers. structure, both hydroxylated polyethylene resin and polymer modified bio-based wood fiber contain hydroxyl groups, and polymer modified bio-based wood fiber is grafted with hydrophobic organic polymers, and the matrix chain of hydroxylated polyethylene resin is hydrophobic polymerization material, so that the two can be blended and dispersed evenly during mixing, and the hydroxyl groups and amino groups contained on the surface of the polymer modified bio-based wood fiber undergo crosslinking reactions with the hydroxyl groups on the hydroxylated polyethylene resin through diisocyanate to form a dense network. The structure improves the bonding force between the two, thereby improving the mechanical strength of the wood-plastic composite material, and the active calcium carbonate is filled in the voids of the network structure during the crosslinking process, which further improves the compactness of the wood-plastic composite material. properties, so that its mechanical strength increases, and the water-absorbing hydroxyl groups on the wood fibers also react through cross-linking, so that the water-absorbing groups are reduced, and the water-absorbing performance is further reduced, which solves the problem that the existing wood-plastic composite materials used in the preparation process The wood fiber structure itself has a higher pore structure after treatment, resulting in a decrease in the mechanical strength of the wood fiber matrix itself, and an increase in water absorption performance. The mechanical properties of the wood-plastic composite material after compounding are also reduced, while the water absorption performance also raised the issue

Images