Nylon powder for selective laser sintering and preparation method thereof

Abstract

The invention provides a preparation method for nylon powder used for selective laser sintering. The preparation method comprises the following steps: adding graphene powder into a mixed solution of sodium nitrate and sulfuric acid, carrying out stirring in an ice-water bath, then adding potassium permanganate, carrying out a reaction under heating, then adding hydrogen peroxide for neutralization, and carrying out ultrasonic treatment, suction filtration, washing and drying so as to obtain graphene oxide powder; adding graphene oxide powder, diamine, binary acid, an antioxidant and water intoa polymerization kettle, and carrying out polymerizing so as to obtain graphene-added modified nylon granules; adding the nylon granules, alcohol, an antioxidant and graphene oxide into a reaction kettle, and carrying out heating, stirring, cooling, suction filtration and drying so as to obtain nylon powder; and mixing the nylon powder, an antioxidant and a flow auxiliary agent so as to obtain the nylon powder used for selective laser sintering. The nylon powder used for selective laser sintering has higher crystallinity and higher strength.

Description

technical field [0001] The invention relates to the field of selective laser sintering, in particular to a nylon powder for selective laser sintering and a preparation method thereof. Background technique [0002] Selective Laser Sintering (SLS) is a widely used rapid prototyping technology at present. The principle of the forming process is: firstly establish a computer 3D model of the target part, and then use layered software to process the 3D model. Slicing processing, to obtain the data information of each processing level, under the control of the computer, according to the slice level information, use the laser beam to scan and sinter the heat-fusible powder material layer by layer, and finally complete the processing and manufacturing of the target parts. [0003] Carbon is one of the most abundant elements on the earth. Graphite and diamonds are common in people's daily life. In recent decades, other allotropes of carbon have also been discovered, fullerenes, carbo...

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Problems solved by technology

[0006] In order to improve the problem of agglomeration of graphene powder additive materials in selective laser sintering technology and realize the dispersion and reinforcement of graphene powder, the invention provides a nylon powder for selective laser sintering and its preparation method