Polyurethane composite material for 3D printing, and preparation method and application thereof

Abstract

The invention discloses a polyurethane composite material for 3D printing, and a preparation method and application thereof. The invention is characterized in that the polyurethane composite material is prepared from the following initial raw materials in parts by weight: 100 parts of polyurethane, 0.1-10 parts of inorganic filler, 0.1-0.5 part of light stabilizer and 0.1-0.5 part of antioxidant. The preparation method comprises the following steps: evenly mixing 100 parts of polyurethane, 0.1-10 parts of inorganic filler, 0.1-0.5 part of light stabilizer and 0.1-0.5 part of antioxidant, and preparing power to obtain the composite material, wherein the average particle size of the composite material powder is 10-100 mu m. The product can be prepared by a 3D printing technique, such as selective laser sintering. The polyurethane has favorable flexibility; and the introduced inorganic filler improves the 3D printing performance of the polyurethane, so that the product has excellent mechanical properties. The tensile strength of the product prepared from the material by laser sintering can reach 20.12 MPa, and the elongation at break can reach 511.12%.

Description

technical field [0001] The invention relates to a polyurethane composite material for 3D printing and its preparation method and application, belonging to the field of polymer material processing. Background technique [0002] 3D printing technology, that is, rapid prototyping (RP) technology, it is based on the computer three-dimensional design model, using metal powder, ceramic powder, polymer powder materials to obtain products through layer-by-layer printing and superposition molding. 3D printing technologies include Stereo Lithography Apparatus, Laminated Object Manufacturing, Selective Laser Sintering and Fused Deposition Manufacturing. [0003] Selective laser sintering is the most widely used 3D printing technology. The idea of ​​selective laser sintering was proposed by C.R.Dechard of the University of Texas at Austin in 1986, and the selective laser sintering process was successfully developed in 1989. This process is the fastest-growing, most successful and comm...

AI Technical Summary

Problems solved by technology

[0004] However, the biggest problem with the selective laser sintering process is the limited polymer material available for sintering

In theory, all polymer powders can be used in the selective laser sintering process, but there are very few polymer materials that can be used for laser sintering on the market. Currently, nylon-12 is the most widely used, accounting for more than 95%, while Other polymer materials that can be used for laser sintering, such as nylon-11, polycarbonate, polystyrene, polyetheretherketone, etc., have less applications

At the same time, the properties of the products obtained by these materials through the selective laser sintering process are still far behind those obtained by traditional processing techniques, such as injection molding, extrusion and casting.

Therefore, the 3D printing technology based on the selective laser sintering process has not been used in the industrial production of products.

[0005] In addition, the currently used polymer materials based on nylon-12 are all rigid products obtained by laser sintering, which have high hardness and poor flexibility.

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