A kind of low-warpage nylon powder composite material for 3D printing and its preparation method

Abstract

The invention discloses a low-warpage nylon powder composite material for 3D printing and a preparation method thereof. The low-warpage nylon powder composite material is characterized by consisting of the following raw materials in percentage by weight: 66-88.6% of nylon, 10-30% of micron-order inorganic filler, 1-2% of coupling agent, 0.1-0.5% of hindered phenol antioxidant, 0.2-1.0% of phosphite antioxidant and 0.1-0.5% of other aids, wherein the other aids refer to one or a combination of more of a dispersing agent, a nucleating agent and a lubricating agent. In the invention, by combining the micron-order inorganic filler, coupling agent, hindered phenol antioxidant and phosphite antioxidant, the low-warpage nylon powder composite material for 3D printing, prepared by spray drying, has excellent warpage resistance and good bonding property; the distribution of spherical particles is narrow, the fluidity is good, and the problem of layered powder drop is avoided; and moreover, the preparation efficiency is high, the energy consumption is low, and the material is simple and easy to process.

Description

technical field [0001] The invention relates to the technical field of nylon powder composite materials, in particular to a low-warpage nylon powder composite material for 3D printing and a preparation method thereof. Background technique [0002] 3D printing technology is an emerging rapid prototyping technology, known as "the most iconic production tool of the third industrial revolution". Selective laser sintering technology is a high-tech 3D printing technology that integrates the latest achievements in the fields of CAD / CAM, numerical control technology, laser processing technology and material science. Applying this technology, powder materials can be bonded to each other and stacked layer by layer through laser irradiation, so as to realize rapid prototyping of products. Compared with the 3D printing technology of polymer materials such as fused deposition rapid prototyping of amorphous polymers such as polystyrene and ABS, and photocuring of photosensitive resins, t...

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Problems solved by technology

[0009] The nylon powder composite material for 3D printing disclosed in the above patent and its preparation method have the following common deficiencies, which affect its promotion and application

[0010] ①The shape of the powder is irregular and the particle size distribution is uneven, resulting in the inability to carry out selective laser sintering molding or serious warping and deformation of the molded product, which cannot meet the requirements of industrial applications for product precision and strength

[0011] ②Complicated process and high cost, slow cooling is required in the process of powder precipitation, low preparation efficiency and high energy consumption

[0012] ③ Stirring and mixing are not evenly distributed, and the composite material powder is easy to delaminate and depowder, which affects the accuracy and strength of 3D printed products

[0013] ④During the printing process, due to the volume shrinkage of nylon crystals, the printed product is warped and deformed, and even cannot be printed

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