Preparation method of nylon powder material for selective laser sintering

A nylon powder and laser sintering technology, which is applied in the field of additive manufacturing, can solve the problems of waste of powder, pollute the environment, increase costs, etc., and achieve the effects of reducing pollution, good surface quality, and low usage ratio

Active Publication Date: 2019-03-26
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual process, the surplus powder cannot be used in other manufacturing processes, resulting

Method used

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  • Preparation method of nylon powder material for selective laser sintering
  • Preparation method of nylon powder material for selective laser sintering
  • Preparation method of nylon powder material for selective laser sintering

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preparation example Construction

[0033] A kind of nylon powder material preparation method for selective laser sintering provided by the invention comprises the following steps:

[0034] (1) Add nylon raw material, end-capping agent, deionized water and antioxidant into the polymerization kettle to undergo polymerization reaction, and then discharge and pelletize through water-cooled drawing strips to obtain nylon pellets, wherein, nylon raw material, end-capping agent And the mass percent of antioxidant is 96~97.5%: 0.5~3.8%: 0.2~0.5%;

[0035] (2) Nylon granules and solvent are mixed and stirred, powder is prepared by solvent method, and nylon powder is obtained by centrifugal filtration, drying and sieving;

[0036] (3) Mix and stir the nylon powder, flow aid and end-capping agent evenly, and then sieve, the average particle size is 40-110 μm, and a nylon powder material for selective laser sintering is prepared.

[0037] By adding an end-capping agent, the nylon pellets with controllable molecular weight...

Embodiment 1

[0060] (1), the mass fraction is 96% nylon 1010 salt, the mass fraction is 3.8% sebacic acid and the mass fraction is 0.2% anti-oxidant, deionized water is added in the polymerization kettle, the reactor is airtight, vacuumized, Then feed inert gas until the pressure inside the reactor is 0.10Mpa, raise the temperature to 220°C, the pressure inside the reactor reaches 1.8MPa, and keep the pressure for 1h; The pressure rate is 0.015Mpa / min, and the temperature is raised to 240°C. In the second stage, the pressure is released to 0.4Mpa, and the pressure release rate is 0.01Mpa / min, and the temperature is raised to 250°C. In the third stage, the pressure is released to normal pressure, and the pressure release rate is The temperature is 0.005Mpa / min, and the temperature is raised to 265°C. After the pressure is released to normal pressure, keep the reaction for 2.5 hours, stop heating and discharge through water-cooled rods, and pelletize to obtain nylon 1010 pellets.

[0061] (...

Embodiment 2

[0064] (1), the mass fraction is 96% nylon 1010 salt, the mass fraction is 3.8% sebacic acid and the mass fraction is 0.2% anti-oxidant, deionized water is added in the polymerization kettle, the reactor is airtight, vacuumized, Then feed inert gas until the pressure inside the reactor is 0.10Mpa, raise the temperature to 220°C, the pressure inside the reactor reaches 1.8MPa, and keep the pressure for 1h; The pressure rate is 0.015Mpa / min, and the temperature is raised to 240°C. In the second stage, the pressure is released to 0.4Mpa, and the pressure release rate is 0.01Mpa / min, and the temperature is raised to 250°C. In the third stage, the pressure is released to normal pressure, and the pressure release rate is The temperature is 0.005Mpa / min, and the temperature is raised to 265°C. After the pressure is released to normal pressure, keep the reaction for 2.5 hours, stop heating and discharge through water-cooled rods, and pelletize to obtain nylon 1010 pellets.

[0065] (...

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Abstract

The invention provides a preparation method of a nylon powder material for selective laser sintering. The preparation method comprises the following steps: adding a nylon raw material, an end cappingagent, deionized water and an antioxidant into a polymerization kettle for a polymerization reaction, and then, carrying out water-cooled bracing, discharging and dicing to obtain nylon aggregates, wherein the mass ratio of the nylon raw material to the end capping agent to the antioxidant is (96-97.5%):(0.5-3.8%):(0.2-0.5%); mixing and stirring the nylon aggregates and a solvent, preparing a powder by using a solvent method, and carrying out centrifugal filtration, drying and sieving to prepare nylon powder; and uniformly mixing and stirring the nylon powder, a flow promoter and the end capping agent, and then, sieving the mixture until the average particle size is 40-110 mu m to prepare the nylon powder material for selective laser sintering. The nylon powder provided by the invention isgood in flowability, high in powder apparent density, good in surface quality and environment-friendly, the rest of powder has high recycling property, and a sintered product cannot generate orange skins, so that the cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a method for preparing a nylon powder material for selective laser sintering. Background technique [0002] Selective laser sintering is a method of manufacturing three-dimensional objects by selectively fusing multiple layers of powder, which allows machining without tools but only by laser sintering multiple overlapping layers of powder according to the three-dimensional image of the object to be produced, to get a 3D solid. This method mainly uses thermoplastic polymer to finish, and patent US6136948 and WO9606881 have carried out detailed description to this method of using powdery polymer to make three-dimensional object. The technology has applications in aerospace, medical, footwear, industrial design, and construction. [0003] In the selective laser sintering process, in the sintering package after the final sintering, a part of the powder th...

Claims

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Application Information

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IPC IPC(8): C08L77/02C08L77/06C08K13/02C08K3/36C08K3/22C08K5/13
CPCC08K3/22C08K3/36C08K5/13C08K13/02C08K2003/2227C08L77/06C08L77/02
Inventor 文杰斌李俭潘强袁博
Owner HUNAN FARSOON HIGH TECH CO LTD
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