Nylon composite material used for selective laser sintering and preparation method of nylon composite material

A nylon composite material and laser sintering technology, applied in the field of additive manufacturing, can solve the problems that the performance of sintered parts cannot meet the requirements for use, the radiation resistance performance cannot fully meet the standard, and the radiation resistance performance is poor, and achieves low cost, complex shape, and low cost. The effect of good radiation resistance

Inactive Publication Date: 2018-05-01
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 shape of tungsten powder is poor. When it is directly mixed with nylon powder by dry mixing, the performance of the sintered part cannot meet the requirements of use when it is formed by selective laser sintering, and the impact resistance is poor, and the radiation resistance is poor.
At the same time, because the amount of tungsten powder in the mixed powder is too small, its radiation resistance performance cannot fully meet the standard

Method used

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  • Nylon composite material used for selective laser sintering and preparation method of nylon composite material
  • Nylon composite material used for selective laser sintering and preparation method of nylon composite material
  • Nylon composite material used for selective laser sintering and preparation method of nylon composite material

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Effect test

Embodiment 1

[0030] Step 1. Add the raw materials caprolactam, tungsten powder, molecular weight modifier and coupling agent into the polymerization kettle, and then add deionized water into the polymerization kettle, wherein the components and their weight percentages are: caprolactam content is 10% , the content of tungsten powder is 88%, the content of molecular weight modifier is 0.5%, the content of coupling agent is 1.5%, and the average particle diameter of tungsten powder is 1 μm. Seal the reactor, evacuate it, and stir it, then introduce an inert gas until the pressure inside the reactor is 0.1Mpa, heat up to 190°C, the pressure inside the reactor reaches 1.1MPa, keep the pressure for 0.5h, and then slowly release the gas to normal pressure , heat up to 230°C, keep the reaction for 3 hours, stop heating, water-cool the strands to discharge, pelletize, and obtain nylon composite pellets;

[0031] Step 2. Prepare nylon composite powder by cryogenic crushing in step 1. In the cryogen...

Embodiment 2

[0035] Step 1. Add raw material PA1010 salt, tungsten powder, molecular weight regulator and coupling agent into the polymerization kettle, and then add deionized water into the polymerization kettle, wherein the components and their weight percentages are: PA1010 salt content is 20%, the content of tungsten powder is 78%, the content of molecular weight modifier is 1%, the content of coupling agent is 1%, and the average particle diameter of tungsten powder is 5 μm. Seal the reactor, evacuate it, and stir it, then introduce an inert gas until the pressure inside the reactor is 0.12Mpa, raise the temperature to 210°C, the pressure inside the reactor reaches 1.3MPa, keep the pressure for 1.5h, and then slowly release the gas to normal pressure , heat up to 260°C, keep the reaction for 1.5h, stop heating, water-cool the strands to discharge, pelletize, and obtain nylon composite pellets;

[0036] Step 2. Prepare nylon composite powder by cryogenic crushing in step 1. In the cryo...

Embodiment 3

[0040]Step 1. Add the raw materials PA1010 salt and PA610 salt, tungsten powder, molecular weight regulator and coupling agent into the polymerization kettle, and then add deionized water into the polymerization kettle. The components and their weight percentages are: PA1010 The content of salt is 10%, the content of PA610 salt is 20%, the content of tungsten powder is 66%, the content of molecular weight regulator is 2%, the content of coupling agent is 2%, and the average particle size of tungsten powder is 10μm. Seal the reactor, evacuate it, and stir it, then introduce an inert gas until the pressure inside the reactor is 0.15Mpa, raise the temperature to 235°C, the pressure inside the reactor reaches 1.6MPa, keep the pressure for 3h, and then slowly release the gas to normal pressure, Raise the temperature to 280°C, keep the reaction for 0.2h, stop heating, water-cool the strands to discharge, pelletize, and obtain nylon pellets;

[0041] Step 2. Prepare nylon powder by c...

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Abstract

The present invention provides a nylon composite material used for selective laser sintering. The nylon composite material is prepared from the following components in percentages by mass: 10%-30% ofa nylon raw material, 66%-88% of tungsten powder, 1%-2% of a coupling agent, and 1%-2%of a molecular weight modifier. According the method provided by the present invention, the nylon raw material, the tungsten powder, the coupling agent and the molecular weight modifier are added into a polymerization kettle, and a nylon composite material is prepared in the polymerization kettle under the stirring condition; and then the powder particle size is controlled by adjusting a cryogenic grinding process, after drying is performed, other auxiliary agents are added, and therefore the high-tungsten-content nylon composite material is obtained. When the material provided by the invention is used to the selective laser sintering process, a workpiece with a complex shape, low costs and a high densitycan be prepared, and the workpiece has better radiation resistance.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a nylon composite material used for selective laser sintering and a preparation method thereof. Background technique [0002] High-density materials have broad application space in aerospace, security inspection equipment and entertainment, especially in the medical field and nuclear power field. At present, the most widely used high-density radiation protection materials are materials containing high atomic numbers such as lead (eg, lead, soft lead, organic lead glass) and tungsten. However, lead materials are prone to lead dust emission during processing and transportation, which is harmful to a certain extent. Tungsten powder is a chemically stable metal with high density and is an ideal anti-radiation material. However, tungsten is difficult to work, which limits its application. At present, some institutions use tungsten powder for selective las...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/06C08K3/08C08G69/16B29C64/153B33Y70/00
Inventor 文杰斌李中元陈礼徐文雅赖端
Owner HUNAN FARSOON HIGH TECH CO LTD
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