Wood-plastic composite powder for selective laser sintering rapid forming and preparation method thereof

Abstract

The invention provides a wood-plastic composite powder for selective laser sintering rapid forming and a preparation method thereof, which relate to the wood-plastic composite powder and the preparation method thereof. The invention overcomes the defects that in the SLS processing with mixed powder consisting of wood powder and hot melt adhesive powder, the powder pushing is uneven, the processed components have large relative warp rate and internal stress, poor surface roughness and low strength, and are easily ruptured at the parts with 'defects'. The wood-plastic composite powder is prepared from the hot melt adhesive powder, the wood powder after alkalization treatment, a viscosity reducer, a coupling agent, an initiating agent, a light stabilizer and an organic packing material. The preparation method comprises the following steps: firstly, alkalizing the wood powder; secondly, preparing a base material; and thirdly, adding the viscosity reducer, the light stabilizer and the organic packing material, mixing the materials evenly, and drying the mixture. The wood-plastic composite powder can reduce the conglutination and aggregation caused by the moisture absorption of the wood powder, can be paved and formed evenly, and has high forming accuracy, and when the wood-plastic composite powder is applied to the components processed by the SLS technique, the relative warp rate is between 0.26 and 0.45 percent, and the surface roughness Ra is less than 0.01 millimeter.

Description

technical field [0001] The invention relates to a wood-plastic composite powder and a preparation method thereof. Background technique [0002] Rapid prototyping has completely subverted the traditional method of using material removal to achieve the shape and accuracy of parts, and uses a new "additive" method to process parts. Rapid prototyping technology is of great significance for shortening the design evaluation cycle of new products, providing designers, manufacturers and users with real and visible physical models, conducting functional testing experiments, and performing rapid mold manufacturing and rapid part manufacturing. Rapid prototyping has been widely used in the fields of automobiles, aviation, electrical appliances, and medical treatment. [0003] Selective laser sintering (SLS) is a kind of rapid prototyping. It uses lasers as energy sources. Its working process is as follows: firstly, a three-dimensional solid CAD model of the part is established in the ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of uneven powder pushing and uneven thickness of powder spreading in the selective laser sintering rapid prototyping process of choosing the mixed powder composed of wood powder and hot melt adhesive powder, which leads to the relatively large size of the processed parts. The warpage rate, internal stress and surface roughness are poor, the strength is not high, and it is easy to break at the "defect" place, which affects the safety of use. The product still needs further mechanical modification, and the molded parts are easy to oxidize and degrade after being exposed to ultraviolet rays. And cause the defect that mechanical performance deteriorates, and provide a kind of wood-plastic composite powder for selective laser sintering rapid prototyping and preparation method thereof