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Nylon alloy composite micro-powder for selective laser sintering, and preparation method thereof

A laser sintering and selective technology, applied in the field of polymer materials, can solve the problems of low low temperature impact performance, poor environmental stress resistance, and high water absorption

Active Publication Date: 2017-05-31
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with long-chain nylons such as nylon 12, short-chain nylons have disadvantages such as high water absorption, low low-temperature impact performance, and poor environmental stress resistance, which limit the application of short-chain nylons to a certain extent.

Method used

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  • Nylon alloy composite micro-powder for selective laser sintering, and preparation method thereof
  • Nylon alloy composite micro-powder for selective laser sintering, and preparation method thereof
  • Nylon alloy composite micro-powder for selective laser sintering, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 40g of nylon 6 and 10g of nylon 12 into 350ml of formic acid and heat to 100°C, stir for 2 hours to fully dissolve the materials. Then add 450ml of ethanol solution containing 100g of PVP-K30 and stir to precipitate powder, filter, wash and dry to obtain nylon alloy micropowder;

[0033] Get above-mentioned gained nylon alloy micropowder 50g, and flow aid nano silicon dioxide 0.1g, antioxidant 2,2'-methylene bis-(4-methyl-6-tert-butylphenol) 0.1g, in stand Stir and mix in a type agitator for 1 hour, and pass through a 150-mesh sieve after the materials are evenly mixed to obtain nylon micropowder for selective laser sintering. figure 1 For the scanning electron micrograph of the nylon alloy micropowder prepared in Example 1, its average particle diameter is 80 microns. Figure 6 It is the DSC curve chart of the nylon alloy micropowder prepared in embodiment 1. There are melting peaks at 172.7°C, 178.5°C, 217.8°C, and 207.9°C, and crystallization peaks at 159.4°C a...

Embodiment 2

[0035] Add 25g of nylon 6 pellets and 25g of nylon 12 pellets into 350ml of formic acid and heat to 100°C, stir for 2 hours to fully dissolve the materials. Then add 450ml of ethanol solution containing 100g of PVP-K30 and stir to precipitate powder, filter, wash and dry to obtain nylon alloy micropowder;

[0036] Get above-mentioned gained nylon alloy micropowder 50g, and flow aid nano silicon dioxide 0.1g, antioxidant 2,2'-methylene bis-(4-methyl-6-tert-butylphenol) 0.1g, in stand Stir and mix in a type agitator for 1 hour, and pass through a 150-mesh sieve after the materials are evenly mixed to obtain nylon micropowder for selective laser sintering. figure 2 For the scanning electron micrograph of the nylon alloy micropowder prepared in embodiment 2, its average particle diameter is 75 microns. Figure 5 The DSC curve of the nylon alloy powder prepared in Example 2 has melting peaks at 178.1°C, 207.8°C, and 217.3°C, respectively, and crystallization peaks at 159.4°C and ...

Embodiment 3

[0038] Add 10g of nylon 6 pellets and 40g of nylon 12 pellets into 350ml of formic acid and heat to 100°C, stir for 2 hours to fully dissolve the materials. Then add 450ml of ethanol solution containing 100g of PVP-K30 and stir to precipitate powder, filter, wash and dry to obtain nylon alloy micropowder;

[0039] Get above-mentioned gained nylon alloy micropowder 50g, and flow aid nano silicon dioxide 0.1g, antioxidant 2,2'-methylene bis-(4-methyl-6-tert-butylphenol) 0.1g, in stand Stir and mix in a type agitator for 1 hour, and pass through a 150-mesh sieve after the materials are evenly mixed to obtain nylon micropowder for selective laser sintering. image 3For the scanning electron micrograph of the nylon alloy micropowder prepared in Example 3, its average particle diameter is 60 microns. Figure 6 It is the DSC curve chart of the nylon alloy micropowder prepared in embodiment 3. There are melting peaks at 178.7°C, 206.1°C, and 217.3°C, and crystallization peaks at 158...

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Abstract

The present invention discloses nylon alloy micro-powder for selective laser sintering, wherein the nylon alloy composite micro-powder comprises regular and irregular spherical or ellipsoidal particles having a diameter of 10-300 [mu]m, and the particles comprise the following raw materials by weight: 1-99% of short chain nylon, 1-99% of long chain nylon, 0.1-2% of an antioxidant, and 0.1-5% of a flowing aid. According to the present invention, the alloy micro-powder is prepared under the action of the PVP aid through the improved dissolving precipitation method, has the size of 10-300 [mu]m, has god fluidity, and does not contain the compatibilizer; the two materials have good compatibility and complement the advantages to each other, wherein the flexibility of the nylon 6 is increased while the price is much lower than the commercial nylon 12 micr-powder so as to provide a certain economic significance; and the product is expected to be adopted as the SLS selective laser sintering technology material, and the application range of the SLS technology in the fields of aviation, vehicles, medical devices, electronic instruments, mechanical molds, artworks and the like can be broadened.

Description

technical field [0001] The present invention relates to the field of polymer materials, and more specifically relates to a nylon alloy composite micropowder and a preparation method thereof. Background technique [0002] Selective laser sintering (SLS) is one of the most important 3D printing methods. SLS technology uses powder materials as molding raw materials. The selection of raw materials and the preparation of micropowder are two very key factors in the research and development process of powder materials for SLS. The powder material based on long-chain nylon 12 is currently the most important consumable for SLS technology. Nylon 12 sintered parts can be used not only as model parts, but also as functional parts in special fields. This is mainly due to the fact that the nylon 12 material itself has the lowest water absorption rate, good dimensional stability; the lowest melting point, easy processing; good toughness, the smallest relative density, and small shrinkage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/06C08K3/36C08K5/13
Inventor 王格侠刘平季君晖王萍丽任中来甄志超
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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