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A kind of powder alloy material based on polyamide and preparation method thereof

A polyamide powder and powder alloy technology, which is applied in the field of additive manufacturing, can solve the problems affecting the dimensional stability and mechanical properties of the workpiece, the application of powder alloy materials, and the poor dry impact performance of polyamide, etc., to achieve interface bonding Strong force, ensuring stability, and improving powder fluidity

Active Publication Date: 2021-06-01
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Polyamide, commonly known as nylon, referred to as PA, is an engineering plastic widely used in machinery, automobiles, electrical appliances, textile equipment, chemical equipment, aviation, metallurgy and other fields. It has excellent mechanical properties, self-lubricating properties, and friction resistance. Good, excellent heat resistance, excellent electrical insulation performance and weather resistance, but because the main chain of the molecule contains a large number of amide groups, the water absorption rate of polyamide is large, and the saturated water can reach more than 3%. At the same time, polyamide has a dry The shortcomings of poor dynamic impact performance and high molding shrinkage rate affect the dimensional stability and mechanical properties of the parts to a certain extent, which limits its application.
With the development of selective laser sintering technology in recent years, more requirements have been placed on materials with composite properties. At present, there are not many types of powder materials used in selective laser sintering technology, mainly semi-crystalline thermoplastic materials such as nylon. Applications with related powder alloy materials

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  • A kind of powder alloy material based on polyamide and preparation method thereof

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preparation example Construction

[0034] The present invention also provides a method for preparing a polyamide-based powder alloy material, comprising: mixing and stirring the components included in the polyamide-based powder alloy material evenly, passing through a 100-mesh sieve, and drying to obtain a polyamide-based powder alloy material. Amide powder alloy material.

[0035] The present invention will be further described in detail through specific implementation methods below.

Embodiment 1

[0037] (1) 3200g of PA46 powder with an average particle size of 60μm, 800g of PPS powder with an average particle size of 60μm, 30g of nano-silica, 150g of styrene-maleic anhydride powder with an average particle size of 3μm, 10g of 2,6-di-tert-butyl - Add 4-methyl-phenol, 5g 2,2'-ethylenebis(4,6-di-tert-butylphenyl) fluorophosphite into the mixer, mix well, pass through a 100-mesh sieve, 80°C Vacuum drying for 4 hours to obtain PA46 and PPS powder alloy material;

[0038] (2) The above-mentioned powder was sintered on the ST252 selective laser sintering equipment of Hunan Farsoon Hi-Tech, and the performance test of the obtained sintered sample was carried out. The results are shown in Table 1.

Embodiment 2

[0043] (1) 2400g of PA46 powder with an average particle size of 60μm, 1600g of PPS powder with an average particle size of 60μm, 30g of nano-silicon dioxide, 150g of styrene-maleic anhydride with an average particle size of 3μm, and 10g of 2,6-di-tert-butyl- Add 4-methyl-phenol and 5g of 2,2'-ethylenebis(4,6-di-tert-butylphenyl)fluorophosphite into the mixer, mix evenly, pass through a 100-mesh sieve, vacuum at 80°C Dry for 4 hours to obtain PA46 and PPS powder alloy material;

[0044] (2) The above-mentioned powder was sintered on the ST252 selective laser sintering equipment of Hunan Farsoon Hi-Tech, and the performance test of the obtained sintered sample was carried out. The results are shown in Table 1.

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Abstract

The invention provides a polyamide-based powder alloy material. The components and mass content of the powder alloy material are as follows: polyamide powder is 40% to 97.8%, and special engineering plastic powder or thermoplastic polyester powder is 1%. ~50%, powder compatibilizer 1%~10%, powder flow aid 0.1%~2%, powder antioxidant 0.1%~1%, the polyamide powder and special engineering plastic powder or thermoplastic polymer The melting point of the ester powder is the same or close. In the present invention, since the melting point and crystallization point of polyamide powder and special engineering plastic powder or thermoplastic polyester powder are similar, the basic requirements of the selective laser sintering process are met, and the low water absorption of special engineering plastic powder or thermoplastic polyester powder can be greatly improved. It can make up for the shortcomings of polyamide powder. The obtained powder alloy material has good powder fluidity, and the sintered parts have good physical and mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a polyamide-based powder alloy material and a preparation method thereof. Background technique [0002] Selective laser sintering (SLS) is a method of manufacturing three-dimensional objects by selectively fusing multiple layers of powder, which allows tool-free processing, but only by laser sintering multiple layers of powder according to the three-dimensional image of the object to be produced. Overlap layers to obtain 3D solids. This method is mainly accomplished using thermoplastic polymers, and patents US6136948 and WO9606881 describe in detail the method of using powdered polymers to manufacture three-dimensional objects. [0003] Polyamide, commonly known as nylon, referred to as PA, is an engineering plastic widely used in machinery, automobiles, electrical appliances, textile equipment, chemical equipment, aviation, metallurgy and other fields...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/06C08L81/02C08L35/06C08L81/06C08L77/02C08K13/02C08K3/36C08K5/13C08K5/526
CPCC08L77/02C08L77/06C08L2205/02C08L2205/03C08L2205/035C08L81/02C08L35/06C08K13/02C08K3/36C08K5/13C08K5/526C08L81/06C08L67/02
Inventor 谭锐陈礼彭博杨云龙苏博
Owner HUNAN FARSOON HIGH TECH CO LTD
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