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Nylon powder for selective laser sintering and preparation method of nylon powder

A nylon powder and laser sintering technology is applied in the field of nylon powder for selective laser sintering and its preparation. The effect of improving quality and performance, and improving toughness

Active Publication Date: 2016-07-13
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing materials have not fully met the market demand in the field of industrial application. The toughness of nylon parts prepared by laser sintering is far worse than that of injection molded parts, and its toughness is even only about 10% of injection molded parts. The reason is mainly due to the fact that holes are easily formed inside the sintered parts. Some fields in the prior art will directly add nano-titanium dioxide to the nylon powder to increase its toughness, but in the field of selective laser sintering, it is directly added to the nylon powder by physical blending. The method of adding nano-titanium dioxide to the powder will cause poor bonding effect with nylon due to the uneven dispersion of nano-titanium dioxide, which will lead to worse toughness of the workpiece made by laser sintering. Although the color of the sintered part has improved, the sintered The roughness of the workpiece surface increases instead

Method used

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  • Nylon powder for selective laser sintering and preparation method of nylon powder

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preparation example Construction

[0020] The invention relates to a nylon powder for selective laser sintering. The material components include: a nylon salt with a mass fraction of 97% to 98.8%, a molecular weight regulator with a mass fraction of 0.5% to 2%, and a mass fraction of 0.2%. ~0.8% antioxidant, mass fraction is the modified titanium dioxide of 0.4%~2%, the preparation method of a kind of selective laser sintering nylon powder that the present invention relates to comprises the following steps:

[0021] (1) Add nano-titanium dioxide and modifier into a sufficient amount of acetonitrile at a ratio of 1:0.5~1:2, stir at 60~90°C for 2~8h, filter and dry with suction to obtain carboxylic acid group-coated Modified titanium dioxide, the modifier is one of sebacic acid, dodecanedioic acid, tetradecanedioic acid, hexadecandioic acid, octadecanedioic acid, the selected long The carbon chain diacid makes the titanium dioxide uniformly dispersed, so that the prepared nylon is stable and has strong oxidation ...

Embodiment 1

[0030] 1. Weigh 20kg of washed nylon 1212 salt, mix nylon 1212 salt, deionized water, antioxidant, and molecular weight regulator in a mass ratio of 1:0.4:0.002:0.008, and add it to the polymerization kettle. Airtight and vacuumize for 10 minutes to make the pressure inside the kettle reach 0.002MPa, and then pass carbon dioxide gas to 0.30MPa for protection. Raise the temperature to 210°C, the pressure reaches 1.45MPa, keep the pressure for 0.9 hours, then slowly release the air to normal pressure, raise the temperature to 260°C and keep the reaction for 0.8 hours, stop heating, water-cool the strands to discharge, and pelletize;

[0031] 2. Add 5Kg of the prepared nylon 1212 pellets to the polymerization kettle, add 50Kg of ethanol, stir at a pressure of 1.3MPa and a temperature of 165°C, then lower the temperature and reduce pressure to room temperature and normal pressure, precipitate powder, and centrifugally filter to obtain nylon 1212 powder;

[0032] 3. Take the prepa...

Embodiment 2

[0035] 1. Add 100g of nanometer titanium dioxide and 60g of dodecanedioic acid into 1Kg of acetonitrile, stir at 60°C for 8 hours, filter and dry with suction to obtain modified titanium dioxide coated with carboxylic acid group compound;

[0036] 2. Weigh 20kg of washed nylon 1212 salt, mix nylon 1212 salt, deionized water, antioxidant, molecular weight regulator, and modified titanium dioxide in a mass ratio of 1:0.4:0.002:0.008:0.006, and add it to the polymerization kettle middle. Airtight and vacuumize for 10 minutes to make the pressure inside the kettle reach 0.002MPa, and then pass carbon dioxide gas to 0.30MPa for protection. Raise the temperature to 210°C, the pressure reaches 1.45MPa, keep the pressure for 0.9 hours, then slowly release the gas to normal pressure, raise the temperature to 260°C and keep the reaction for 0.8 hours, stop heating, water-cool the strands to discharge, and pelletize;

[0037]3. Add 5Kg of the prepared nylon 1212 pellets to the polymeriz...

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Abstract

The invention provides nylon powder for selective laser sintering and a preparation method of the nylon powder. The method comprises the steps of firstly modifying nano-titania to obtain modified titania, carrying out condensation polymerization on washed nylon salt, deionized water, an antioxidant, a molecular weight regulator and modified titanium dioxide to obtain nylon aggregates, carrying out solvent precipitation to obtain nylon powder, and finally processing so as to obtain the nylon powder for the selective laser sintering. The tenacity of the prepared nylon powder is greatly improved, the whiteness of selective laser sintering products is increased, the quality and the performance of the selective laser sintering products are greatly improved, and meanwhile, the roughness of the sintering products is improved.

Description

technical field [0001] The invention provides a nylon powder and a preparation method thereof, in particular to a nylon powder for selective laser sintering and a preparation method thereof. Background technique [0002] Selective Laser Sintering technology (Selective Laser Sintering) is a widely used rapid prototyping technology at present. The principle of the forming process is: firstly establish a computer 3D model of the target part, and then use layered software to slice the 3D model to obtain each The data information at the processing level is under the control of the computer, and according to the information at the slice level, the laser beam is used to scan and sinter the heat-fusible powder material layer by layer, and finally complete the processing and manufacturing of the target parts. Selective laser sintering technology can be applied to a very wide range of materials, including polymers, metals and ceramics. [0003] In the selective laser sintering proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08G69/26C08G69/30C08K9/04C08K3/22
CPCC08G69/26C08G69/30C08K3/22C08K9/04C08K2003/2237C08K2201/011C08L77/06
Inventor 文杰斌陈礼李中元谭锐
Owner HUNAN FARSOON HIGH TECH CO LTD