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Polyamide-based powdery alloy material and preparation method thereof

A powder alloy and polyamide technology, applied in the field of additive manufacturing, can solve the problems that affect the dimensional stability and mechanical properties of the workpiece, there is no powder alloy material application, and the dry impact performance of polyamide is poor, so as to improve the dimensional stability properties, improve physical and mechanical properties, and reduce water absorption

Active Publication Date: 2018-02-02
HUNAN FARSOON HIGH TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

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 molecular main chain contains a large number of amide groups, polyamide has a large water absorption rate, 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, to a certain extent, affect the dimensional stability and mechanical properties of the workpiece, limiting 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

Method used

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  • Polyamide-based powdery alloy material and preparation method thereof
  • Polyamide-based powdery alloy material and preparation method thereof

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preparation example Construction

[0036] The present invention also provides a method for preparing a polyamide-based powder alloy material, comprising the following steps:

[0037] (1) Dry the above-mentioned polyamide alloy under a vacuum condition of 60-100° C. for 4-10 hours, then add the above-mentioned materials into a high-speed mixer to mix uniformly to obtain a mixed material, and put the mixed material into a twin-screw extruder to carry out Extrusion and granulation to obtain polyamide alloy particle samples;

[0038] (2) Put the polyamide alloy particles into the low-temperature refrigeration equipment for low-temperature pulverization to obtain polyamide alloy powder, pass through a 100-mesh sieve to obtain 97-99.8wt.% of the polyamide alloy powder, and the powder flow aid is 0.1-2wt.%. %, the powder antioxidant is 0.1-1 wt. %, and the powder is added into a high-speed mixer and mixed uniformly to obtain a polyamide alloy powder material suitable for selective laser forming.

[0039] The present ...

Embodiment 1

[0041] (1) Put 4kg PPS resin, 5.5kg PA46 resin, 0.5kg styrene-maleic anhydride (SMA) alternating copolymer into a vacuum drying oven at 80°C for drying for 6h, add the above materials into a high-speed mixer and mix uniformly, Then, the mixed material is put into a twin-screw extruder for extrusion and granulation, and the obtained granules are subjected to low-temperature freezing and pulverization.

[0042] (2) Mix 7.92kg of the above powder, 0.04kg of fumed silica, and 0.04kg of 2,6-di-tert-butyl-4-methyl-phenol to obtain a PA46 and PPS powder alloy material suitable for selective laser sintering.

[0043] (3) The above powders were sintered on Hunan Farsoon Hi-Tech ST252 selective laser sintering equipment, and the obtained sintered parts were tested for mechanical properties and water absorption. The results are shown in Table 1.

Embodiment 2

[0049] (1) Put 4kg PSF resin, 5.5kg PA46 resin, 0.5kg styrene-maleic anhydride (SMA) alternating copolymer into a vacuum drying oven at 80°C for drying for 6h, add the above materials into a high-speed mixer and mix uniformly, Then, the mixed material is put into a twin-screw extruder for extrusion and granulation, and the obtained granules are subjected to low-temperature freezing and pulverization.

[0050] (2) Mix 7.92kg of the above powder, 0.04kg of fumed silica, and 0.04kg of 2,6-di-tert-butyl-4-methyl-phenol to obtain a PA46 and PSF powder alloy material suitable for selective laser sintering.

[0051] (3) The above powders were sintered on Hunan Farsoon Hi-Tech ST252 selective laser sintering equipment, and the obtained sintered parts were tested for mechanical properties and water absorption. The results are shown in Table 1.

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Abstract

The invention provides a polyamide-based powdery alloy material. The powdery alloy material comprises, by mass, 97-99.8% of polyamide alloy, 0.1-2% of a powder flow aid and 0.1-1% of a powdery antioxidant, the polyamide alloy comprises polyamide, a compatilizer and special engineering plastic or thermoplastic polyester, and the melting point of the polyamide is same or similar to that of the special engineering plastic or thermoplastic polyester. The melting point of the polyamide is same or similar to that of the special engineering plastic or thermoplastic polyester, so basic requirements ofa selective laser sintering technology are met; the disadvantages of the polyamide resin material are made up through the low hydroscopicity of the special engineering plastic or thermoplastic polyester; and the powdery alloy material has good powder fluidity, and a product formed by sintering the powdery alloy material has good physical and mechanical performances.

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. Background technique [0002] Selective Laser Sintering (SLS) is a method of manufacturing three-dimensional objects by selectively fusing multiple layers of powder, which allows machining without the use of tools but simply by laser sintering multiple layers of powder based on a three-dimensional image of the object to be produced. Overlapping layers to obtain 3D solids. This method is mainly accomplished using thermoplastic polymers, and the method of manufacturing three-dimensional objects using powdered polymers is described in detail in patents US6136948 and WO9606881. [0003] Polyamide, commonly known as nylon, or PA for short, is an engineering plastic widely used in machinery, automobiles, electrical appliances, textile equipment, chemical equipment, aviation, metallurgy and oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L67/02C08L77/06C08L81/02C08L81/06C08L51/06C08K3/36C08K5/13B29B9/06B33Y70/00
CPCB29B9/06B33Y70/00C08L77/02C08L77/06C08L2205/02C08L2205/03C08L2205/035C08L81/06C08L51/06C08K3/36C08K5/13C08L81/02C08L67/02
Inventor 谭锐陈礼彭博
Owner HUNAN FARSOON HIGH TECH CO LTD
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