Thermoplastic elastomer material and preparation method thereof

Abstract

The invention discloses a thermoplastic elastomer material and a preparation method thereof, and relates to the technical field of 3D printing. The preparation method comprises the following steps: athermoplastic elastomer, a viscosity thixotropic agent and an additive are blended under a normal-temperature condition, and a mixed material is obtained, wherein the thermoplastic elastomer is at least one selected from a group consisting of thermoplastic polyurethane elastomers, thermoplastic polyester elastomers and thermoplastic polyamide elastomers, the viscosity thixotropic agent is polyhedral oligomeric silsesquioxane, at least one functional group R exists in the polyhedral oligomeric silsesquioxane, and the functional group R is at least one selected from carboxyl, hydroxyl or amino;melt extrusion is carried out on the mixed material through a double-screw extruder, and then cooling and granulating are carried out; and the obtained granules are dried, and then extruding processing is carried out, so that the thermoplastic elastomer material is obtained. According to the invention, the functional group R of the polyhedral oligomeric silsesquioxane and a thermoplastic elastomerpolymer molecular chain are selected to form a hydrogen bond effect, so that the interlayer adhesion force of 3D printing products can be improved, and the problem of wire drawing and warping deformation of thermoplastic elastomer materials in 3D printing can be solved.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a thermoplastic elastomer material and a preparation method thereof. Background technique [0002] 3D printing technology (also known as 3D rapid prototyping or additive manufacturing technology) is a new manufacturing technology that emerged and developed in the late 1980s. Compared with traditional manufacturing technology, 3D printing technology can manufacture arbitrarily complex three-dimensional geometric entities, and the manufacturing cycle is greatly shortened, and the preparation cost is greatly reduced. 3D printing technology puts forward a brand-new thinking mode in terms of forming principles, that is, according to the principle of "layer-by-layer manufacturing, layer-by-layer superposition", it can be modeled in 3D by computer according to data such as computer-aided design (CAD) models or CT tomographic scans. After conversion, it is input into the computer in...

AI Technical Summary

Problems solved by technology

For example, in the Chinese patent CN104312120A (a flexible plastic thread for 3D printing), the flexible plastic thread for 3D printing is prepared by blending polylactic acid, thermoplastic polyolefin elastomer and other additives, but in this technology, polylactic acid hard material as the matrix, which greatly reduces the original characteristics of high flexibility and high elasticity of thermoplastic elastomers.

Another example is Chinese patent CN104292850 (a flexible material based on 3D printing and its preparation method), which blends thermoplastic elastomers, synthetic resins, mineral oil, antioxidants and pigments to prepare flexible filaments for 3D printing. However, synthetic resins such as polystyrene and polypropylene have seriously affected the original high flexibility and high elasticity of thermoplastic elastomers. In addition, this technology has not studied the drawing phenomenon of flexible filaments during 3D printing and the dimensional stability of shaped products. etc. to describe

At present, although there are highly flexible 3D printing consumables in foreign countries, in the process of 3D printing, there are problems such as wire drawing, warping and deformation of molded products, and high prices. Therefore, it is very important to develop low-cost and highly flexible 3D printing consumables. the meaning of