Copolymer based powdered material for selective laser sintering and preparation method thereof

Abstract

The invention discloses a multipolymer base powder material used for SLS and a preparation method thereof. The multipolymer is a styrene-acrylonitrile (SAN) multipolymer. The preparation method comprises the following steps that: firstly, an SAN resin is subjected to deep cooling and crushing; secondly, the multipolymer powder with appropriate grain diameter and appropriate distribution of the grain diameter is selected by the sieve method; and finally, a certain proportion of the multipolymer powder, carbon soot and a flow aid are mixed evenly to produce the multipolymer base powder material. Because the SAN is an amorphous polymer, the vitrification temperature is low and the die shrinkage is small; therefore, the multipolymer base powder material has good sintering performance and highdrip molding accuracy. Meanwhile, the SAN has appropriate melt viscosity and body intensity; therefore, the SLS die molding of the multipolymer base powder material also has high intensity. The multipolymer base powder material can be used to manufacture a wax pattern used for lost wax casting and a functional element meeting general requirements through SLS forming and appropriate post treatment.

Description

technical field

[0001] The invention belongs to the field of novel materials, and in particular relates to a copolymer-based powder material used for selective laser sintering (SLS) and a preparation method thereof. The copolymer is styrene-acrylonitrile copolymer (SAN). technical background

[0002] SLS technology is a rapid prototyping technology (rapid prototyping, RP) that uses laser as a heat source to sinter powder materials into shape. Solid parts, independent of form complexity. SLS can form a variety of materials, including polymers, metals and ceramics. Compared with metal and ceramic materials, polymer materials have the advantages of low molding temperature, low sintering laser power, and high precision. They have become the most widely used and most successful SLS materials.

[0003] The polymer materials used in SLS are mainly thermoplastic polymers, and thermoplastic polymers can be divided into two types: crystalline and amorphous. Due to the very differen...