3D printing weather-resistant nylon powder composite material and preparation method thereof

Abstract

The invention discloses a 3D printing weather-resistant nylon powder composite material and a preparation method thereof. The 3D printing weather-resistant nylon powder composite material is characterized by being prepared from the following components in percentage by mass: 97-99.4wt% of nylon, 0.1-0.5wt% of a hindered amine light stabilizer, 0.1-0.5wt% of an ultraviolet light absorber, 0.1-0.5wt% of a hindered phenol antioxidant, 0.2-1.0wt% of a phosphite ester antioxidant and 0.1-0.5wt% of other additives, wherein the other additives comprise one or combination of multiple components of a dispersing agent, a nucleating agent and a lubricant. With the combination of the hindered amine light stabilizer, the ultraviolet light absorber, the hindered phenol antioxidant and the phosphite ester antioxidant, the 3D printing weather-resistant nylon powder composite material prepared through spray-drying is excellent in weather resistance and small in mechanical property change before and after being modified, can be recycled and reused for multiple times, is narrow in spherical granule distribution, good in flowing property, free of layering or powder dropping, and moreover is high in preparation efficiency, small in energy consumption and simple and easy to process.

Description

technical field [0001] The invention belongs to the technical field of nylon powder composite materials, and in particular relates to a weather-resistant 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 photos...

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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, or when materials and products are exposed to long-term irradiation containing UV light, yellowing and brittleness are prone to occur

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