Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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

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

Inactive Publication Date: 2008-12-10
武汉华科三维科技有限公司
View PDF0 Cites 23 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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 size 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 req...

Embodiment 3

[0034] (1) Cool the SAN resin with a glass transition temperature of 105°C and a melt index of 60g / 10min to -140°C in a cryogenic freezer, 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) 10Kg copolymer powder that step (2) obtains, 20g mean particle diameter is that carbon black of 100nm and 80g nano-calcium carbonate are added 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]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Glass transition temperatureaaaaaaaaaa
Melt indexaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Login to View More

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 high drip 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com