Manufacturing method of wood-plastic granules with ultrahigh wood fiber content and composite material

Abstract

The invention discloses a manufacturing method of wood-plastic granules with ultrahigh wood fiber content. The manufacturing method comprises the following steps: S1, sufficiently and uniformly mixing a wood-plastic component A with low wood fiber content and a wood fiber component B through a mixer respectively; and S2, carrying out melt extrusion granulation on the component A to obtain particles A, further uniformly mixing the particles A with the wood fiber component B, carrying out melt compounding, and carrying out extrusion granulation to obtain the wood-plastic granules with the ultrahigh wood fiber content of not less than 80wt%. And extruding or hot-pressing the wood-plastic granules with the ultrahigh wood fiber content through an extruder to obtain the wood-plastic composite material with the ultrahigh wood fiber content. According to the invention, a sectional type double-screw extruder is adopted, and a wood-plastic component A with low wood fiber content and a wood fiber component B are added in batches in a step-by-step granulation mode; the technical problems that a traditional wood-plastic extruder cannot achieve manufacturing of the wood-plastic composite material with the ultrahigh wood fiber content, and the ultrahigh wood fiber content is difficult to feed and uneven in dispersion can be solved.

Description

technical field [0001] The invention relates to a method for manufacturing wood-plastic composite materials, in particular to a method for manufacturing wood-plastic pellets with ultra-high wood fiber content and composite materials. Background technique [0002] As a green and environmentally friendly composite material, wood-plastic composite material mainly uses thermoplastic polymers such as polyethylene, polypropylene and polyvinyl chloride, and a certain content (5-70wt%) of wood, bamboo, straw and other lignified plant fiber materials. After mixing, it can be obtained by extrusion, molding, injection molding, etc. Wood-plastic composite materials have developed rapidly at home and abroad in recent decades, and are widely used in interior decoration, outdoor garden landscape, construction, transportation, packaging and other fields. Since the price of wood fiber materials is only one-tenth or even lower than that of thermoplastic polymers, increasing the content of ch...

AI Technical Summary

Problems solved by technology

The preparation of wood-plastic with ultra-high wood fiber content is much more difficult than traditional wood-plastic composite materials, because the existence of ultra-high wood fiber content will lead to a sharp increase in the viscosity of wood-plastic melt, which is prone to extrusion distortion and melt fracture. Difficulty in molding

In addition, a large number of wood fibers with low bulk density form bridges, resulting in difficult feeding and uneven dispersion in the wood-plastic matrix.

[0004]In the prior art, it is practically impossible to prepare usable wood-plastic composites with ultra-high wood fiber content

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