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

A powder material and laser sintering technology, applied in the field of new materials, can solve the problems of difficult-to-form thin-walled parts, low strength and low forming temperature of SLS formed parts, and achieve the effects of low preheating temperature, low equipment requirements, and not easy to age.

Inactive Publication Date: 2010-06-30
武汉华科三维科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, due to its lower forming temperature and higher forming precision, PS gradually replaces PC as the most commonly used amorphous polymer for SLS, but its SLS forming parts have low strength and are not easy to form complex and thin-walled parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Cool the SAN resin with a glass transition temperature of 105°C and a melt index of 50g / 10min in a cryogenic freezer to -150°C, and pulverize it with a high-speed impact mill;

[0025] (2) The powder obtained in step (1) is sieved by air flow to obtain copolymer powder with an average particle size of 45 microns and a particle size distribution between 10 and 90 microns.

[0026] (3) Add 10Kg of copolymer powder obtained in step (2), 5g of carbon black with an average particle size of 50nm and 10g of nano-alumina into a high-speed mixer, and uniformly mix to obtain a copolymer-based powder material.

[0027] The copolymer-based powder material prepared in Example 1 contains very little carbon black and flow aids, and can be used for SLS forming with complex structures and thin-walled initial blanks, and then undergo post-treatments such as impregnating wax to obtain wax for investment casting mold.

Embodiment 2

[0029] (1) Cool the SAN resin with a glass transition temperature of 100°C and a melt index of 60g / 10min to -150°C in a cryogenic freezer, and pulverize it with a high-speed impact mill;

[0030] (2) The powder obtained in step (1) is sieved by air flow to obtain copolymer powder with an average particle size of 45 microns and a particle size distribution between 10 and 100 microns.

[0031] (3) Add 10Kg of copolymer powder obtained in step (2), 50g of carbon black with an average particle diameter of 60nm and 200g of nano silicon dioxide into a high-speed mixer, and uniformly mix to obtain a copolymer-based powder material.

[0032] In the copolymer-based powder material prepared in Example 2, there are more carbon black and flow aids, which can play a role in strengthening the SLS formed part. This powder material can be used for SLS forming with complex structure and thin-walled initial blank. After impregnation with epoxy resin, etc., functional parts that can meet general...

Embodiment 3

[0034] (1) Cool the SAN resin with a glass transition temperature of 105°C and a melt index of 60g / 10min in a cryogenic freezer to -140°C, and pulverize it with a high-speed impact mill;

[0035] (2) The powder obtained in step (1) is sieved by air flow to obtain copolymer powder with an average particle size of 55 microns and a particle size distribution between 10 and 100 microns.

[0036] (3) the 10Kg copolymer powder that step (2) obtains, 20g mean particle diameter are 100nm carbon black and 80g nanometer calcium carbonate add in the high-speed mixer, carry out uniform mixing, obtain copolymer base powder material.

[0037] Composition and proportioning of the copolymer-based powder material prepared by three embodiments of table 1

[0038]

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/12C08K3/36C08J3/12C08K3/04C08K3/26C08K3/22
Inventor 史玉升闫春泽杨劲松
Owner 武汉华科三维科技有限公司
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