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Nylon blended polyethylene powder material for use in selective laser sintering (SLS) and preparation method thereof

A polyethylene powder and laser sintering technology, applied in the field of polymer materials, can solve the problems of narrow sintering window of powder materials, difficult to control powder melting, yellowing of molded products, etc., to achieve good particle shape and fluidity, and improve dimensional stability. The effect of improving the stability and surface roughness

Inactive Publication Date: 2014-11-26
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of the currently used polyamide powders is also that they often lead to unsatisfactory mechanical properties
In addition, if the molded product is exposed to strong radiation containing UV light or to direct sunlight for a long time, the molded product may yellow during subsequent use of the finished component
The nylon powder prepared by the existing method still has many defects when it is used for SLS molding and manufacturing, such as powder particle shape and particle size distribution are not uniform enough, the heat resistance of the powder is poor, and the sintering window of the powder material is narrow. And equipment requirements are strict, improper control of sintering temperature will lead to difficult control of powder melting during sintering process or parts warping and deformation due to internal stress, thus affecting the quality of SLS parts

Method used

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  • Nylon blended polyethylene powder material for use in selective laser sintering (SLS) and preparation method thereof
  • Nylon blended polyethylene powder material for use in selective laser sintering (SLS) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A nylon blended polyethylene powder material for laser sintering rapid prototyping products is prepared by the following method:

[0034] 750 parts of nylon 66 powder and 250 parts of linear low-density polyethylene powder were cooled to -60°C in a freezer, and pulverized with a rod-pin structure pulverizer at a disc speed of 250 m / s to obtain nylon 66 powder and Linear low density polyethylene powder;

[0035] Put the above nylon 66 powder and linear low density polyethylene powder into a high-speed mixer, add 10 parts of sodium dodecylbenzene sulfonate, stir evenly at 800 m / s in the mixer, and then dry at 100°C to obtain a base material;

[0036] Add 10 parts of polyethylene grafted maleic anhydride and 80 parts of hollow glass microbeads to the surface-treated base material, and mix them uniformly in a high-speed mixer at a speed of 1000 m / s;

[0037] The above-mentioned modified powder was sieved in a mechanical vibrating screen at a vibration speed of 1700 RPM to ...

Embodiment 2

[0039] A nylon blended polyethylene powder material for laser sintering rapid prototyping products is prepared by the following method:

[0040] Cool 700 parts of nylon 1010 powder and 300 parts of high-density polyethylene polyethylene powder to -80°C in a freezer, and pulverize them with a rod-pin structure pulverizer at a disc speed of 230m / s to obtain nylon 1010 powder. and high density polyethylene powder;

[0041] Put the above nylon 1010 powder and high-density polyethylene powder into a high-speed mixer, add 15 parts of dodecyl ethoxy sulfobetaine, stir evenly at 1000 m / s in the mixer, and then dry at 90 ° C to prepare the base. material;

[0042] Add 50 parts of (styrene / butadiene / styrene) copolymer grafted maleic anhydride and 200 parts of alumina to the base material after surface treatment, and mix uniformly in a high-speed mixer at a speed of 1100m / s;

[0043] The above-mentioned modified powder was sieved in a mechanical vibrating screen at a vibration speed of...

Embodiment 3

[0045] A nylon blended polyethylene powder material for laser sintering rapid prototyping products is prepared by the following method:

[0046] Cool 800 parts of nylon 12 powder and 200 parts of low-density polyethylene powder to -70°C in a freezer, and pulverize them with a rod-pin structure pulverizer at a disc speed of 200 m / s to obtain nylon 12 powder and low-density polyethylene powder respectively. density polyethylene powder;

[0047] Put the above nylon 12 powder and low-density polyethylene powder into a high-speed mixer, add 5 parts of sodium dodecylbenzene sulfonate, stir evenly at 1100 m / s in the mixer, and dry at 110 °C to obtain a base material;

[0048] Add 100 parts of ethylene-acrylate copolymer and 30 parts of solid glass microbeads to the surface-treated base material, and mix them uniformly in a high-speed mixer at a speed of 1000 m / s;

[0049] The above-mentioned modified powder was sieved in a mechanical vibrating screen at a vibration speed of 1000 RPM...

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Abstract

The invention belongs to the field of high molecular materials, and relates to a nylon blended polyethylene powder material for use in selective laser sintering (SLS). The material is prepared from the following components in parts by weight: 700-800 parts of nylon, 200-300 parts of polyethylene, 5-15 parts of a surfactant, 10-100 parts of a bulking agent and 30-200 parts of filler. A preparation method of the nylon blended polyethylene powder material comprises the steps of powder preparation, surface treatment, modification and sieving. Nylon blended polyethylene powder prepared by using the method is good in particle shape and high in fluidity; and meanwhile, a larger sintering window is provided. The mechanical property, surface roughness and the like of the material are improved effectively; and meanwhile, the nylon blended polyethylene powder material has superior physical and chemical properties and appearance quality, and can meet the SLS workpiece requirements in the fields of aviation, automobiles, medical instruments, electronic instruments, mechanical molds, artworks and the like.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a nylon blended polyethylene powder material for selective laser sintering and a preparation method thereof. Background technique [0002] Selective Laser Sintering (SLS) is one of the most widely used rapid prototyping technologies. It uses solid powder as raw material and adopts the principle of layering-superposition to directly manufacture three-dimensional entities from CAD models. Powders with reduced viscosity when heated can be used as SLS sintering materials, and the wide range of materials is one of the important factors for the SLS process to be widely used in various fields. Repeated irradiation of newly applied layers in a constant sequence with this method enables simple and rapid manufacture of three-dimensional products. [0003] The product does not need to undergo injection molding, and can obtain molded parts with high strength and good toughness. It can be dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/06C08L23/06C08L51/06C08L51/00C08K13/04C08K13/02C08K7/28C08K7/20C08K3/22C08K3/26C08K5/42
CPCC08L77/06C08L77/02C08L2205/035C08L2207/062C08L2207/066C08L23/0815C08L51/06C08K7/28C08K5/42C08L23/06C08L51/006C08K2003/2227C08L23/0869C08K7/20C08K2003/265
Inventor 杨桂生赵陈嘉
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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