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Preparation and application methods of selective laser sintering polypropylene powdery material

A technology of laser sintering and powder materials, which is applied in the field of polymer materials, can solve the problems of difficult research and development, large warpage and deformation, and difficult control of the process, and achieve the effect of solving thermal oxidation problems and good sintering performance

Active Publication Date: 2014-09-10
GUANGDONG SILVER AGE SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the warping deformation caused by shrinkage is very large, the process is not easy to control, and the research and development is difficult.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A preparation method of selective laser sintering polypropylene powder material, comprising the following steps:

[0053] Step 1. Obtain polypropylene powder by cryogenic crushing method: use liquid nitrogen as the refrigerant, freeze the PP pellets in liquid nitrogen until the embrittlement temperature is below -35°C to achieve an embrittled and easily crushed state, and then The frozen polypropylene material is put into the cavity of the low-temperature pulverizer, and the impeller rotates at high speed to pulverize it; the polypropylene is isotactic crystalline polypropylene with a molecular weight of 100,000.

[0054] Step 2, classify and collect the polypropylene powder obtained in step 1 by an airflow sieving machine, select polypropylene powder with a particle size within the range of 200 mesh, and return the coarse material that does not meet the fineness requirement to the silo to continue crushing;

[0055] Step (3) Add graphite powder, antioxidant and metal s...

Embodiment 2

[0067] A preparation method of selective laser sintering polypropylene powder material, comprising the following steps:

[0068] Step 1. Obtain polypropylene powder by cryogenic crushing method: use liquid nitrogen as the refrigerant, freeze the PP pellets in liquid nitrogen until the embrittlement temperature is below -35°C to achieve an embrittled and easily crushed state, and then The frozen polypropylene material is put into the cavity of the low-temperature pulverizer, and the impeller is rotated at high speed to pulverize it; the polypropylene is isotactic crystalline polypropylene with a molecular weight of 150,000.

[0069] Step 2, classify and collect the polypropylene powder obtained in step 1 by an airflow sieving machine, select polypropylene powder with a particle size within the range of 300 mesh, and return the coarse material that does not meet the fineness requirement to the silo to continue crushing;

[0070] Step (3) Add graphite powder, antioxidant and meta...

Embodiment 3

[0082] A preparation method of selective laser sintering polypropylene powder material, comprising the following steps:

[0083] Step 1. Obtain polypropylene powder by cryogenic crushing method: use liquid nitrogen as the refrigerant, freeze the PP pellets in liquid nitrogen until the embrittlement temperature is below -35°C to achieve an embrittled and easily crushed state, and then The frozen polypropylene material is put into the cavity of the low-temperature pulverizer, and the impeller rotates at high speed to pulverize it; the polypropylene is isotactic crystalline polypropylene with a molecular weight of 200,000.

[0084] Step 2, classify and collect the polypropylene powder obtained in step 1 by an airflow sieving machine, select polypropylene powder with a particle size within the range of 500 mesh, and return the coarse material that does not meet the fineness requirement to the silo to continue crushing;

[0085] Step (3) Add graphite powder, antioxidant and metal s...

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Abstract

The invention relates to the technical field of high molecular materials and particularly relates to preparation and application methods of a selective laser sintering polypropylene powdery material. The method comprises the following steps: obtaining polypropylene powder by a freeze grinding method; grading and collecting by an airflow screening machine, selecting polypropylene powder with the granularity in a range of 200-800 meshes and returning coarse materials which do not meet the fineness requirement to a stock bin and continuously smashing; and adding 100 parts of polypropylene powder, 0.1-1 part of graphite powder, 0.01-0.5 part of antioxidant and 0.5-6 parts of metallic soap salt and uniformly mixing in a high speed mixer, wherein the granularity of the graphite powder is 1000-5000 meshes and the antioxidant is a compound antioxidant consisting of phenols and phosphonate or thioester in a weight ratio of 1:1. The polypropylene powder prepared by the invention has excellent sintering performance and the SLS (Selective Laser Sintering) formed piece prepared by the polypropylene powder has high mechanical property and dimensional precision.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation and application method of a selective laser sintering polypropylene powder material. Background technique [0002] Selective laser sintering is an important branch of rapid manufacturing technology. It is based on the idea of ​​discrete and stacked forming. It uses laser to selectively scan sintered powder materials, layer-by-layer manufacturing, and layer-by-layer superposition to form a solid model. Different from the traditional processing methods such as removal forming, joint forming and forced forming, it uses the material accumulation method to process and manufacture models and functional parts of polymer materials, ceramics, metals and various composite materials, so it is not affected by the complexity of formed parts. degree of influence. Compared with ceramic and metal materials, polymer materials have the advantages of low forming temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K3/04C08K5/098
CPCB29C67/00C08K3/04C08K5/098C08K5/1345C08K5/372C08K5/524C08K13/02C08K2201/003C08L2201/08C08L23/12
Inventor 史玉升闫春泽朱伟傅轶史云松王艳魏青松刘洁李晨辉吴丽珍
Owner GUANGDONG SILVER AGE SCI & TECH CO LTD
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