Low-temperature nylon powder material for selective laser sintering and preparation method thereof

A technology of laser sintering and nylon powder, which is applied in the direction of solid material additive processing, processing and manufacturing, additive processing, etc., can solve the problems of complex operation, powder can not be reused and waste, long forming cycle, etc., to achieve tensile strength and low temperature High impact strength, increased recycling rate, and high Vicat softening temperature

Active Publication Date: 2015-09-16
GUANGDONG SILVER AGE SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only greatly increases the cost of SLS equipment, but is also very difficult in terms of technical implementation
The direct laser sintering nylon equipment launched by 3D Systems and EOS all have small worktables, and laser sintering of nylon on large worktable equipment is still not possible. However, the SLS equipment sold by the Rapid Manufacturing Center of Huazhong University of Science and Technology in recent years is all large worktables. SLS equipment
[0008](3) Nylon powder is prone to aging at high temperature, which leads to a sharp decline in the mechanical properties of SLS parts and deterioration of laser sintering performance
The price of nylon powder is extremely high, and a large amount of powder that cannot be reused is a serious waste. It is difficult for domestic enterprises to accept such high operating costs, which makes SLS technology lose its competitive advantage in directly preparing plastic functional parts
At present, the SLS equipment developed in China is operated in an air atmo...

Method used

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  • Low-temperature nylon powder material for selective laser sintering and preparation method thereof
  • Low-temperature nylon powder material for selective laser sintering and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0067] A method for preparing a low-temperature nylon powder material for selective laser sintering: comprising the following preparation steps:

[0068] Step 1. Mix dodecanedibasic acid and nylon 12 particles evenly into the reactor, add double-ended amino polyethylene glycol and deuterated trifluoroacetic acid into the reactor, seal it, vacuumize it, and fill it with carbon dioxide. And the initial pressure of the reactor is 0.2MPa.

[0069] Step 2: Heat the reactor to gradually heat up to 180°C, start stirring, continue to heat up to 200°C, open the exhaust valve, reduce the pressure in the kettle to 1.4MPa, and keep the pressure down slowly and uniformly for 0.5 hours, so that the inside of the reactor The pressure was reduced to normal pressure within 2 hours, kept at normal pressure for 0.5 hours, the stirring was stopped, the product was taken out and placed in a cold water tank, and finally dried to obtain the product.

[0070] Step 3: The above-mentioned product, ant...

Embodiment 2

[0083] A method for preparing a low-temperature nylon powder material for selective laser sintering: comprising the following preparation steps:

[0084] Step 1. Mix dodecanedibasic acid and nylon 12 particles evenly into the reactor, add double-ended amino polyethylene glycol and deuterated trifluoroacetic acid into the reactor, seal it, vacuumize it, and fill it with carbon dioxide. And the initial pressure of the reactor is 0.3MPa.

[0085] Step 2: Heating, so that the temperature of the reactor is gradually raised to 190°C, the stirring is started, and the temperature is continued to be raised to 210°C, the exhaust valve is opened, the pressure in the kettle is reduced to 1.3MPa, and the pressure is reduced slowly and uniformly for 0.4 hours, so that the inside of the reactor The pressure was reduced to normal pressure within 1.8 hours, kept at normal pressure for 0.7 hours, the stirring was stopped, the product was taken out and placed in a cold water tank, and finally ...

Embodiment 3

[0099] A method for preparing a low-temperature nylon powder material for selective laser sintering: comprising the following preparation steps:

[0100] Step 1. Mix dodecanedibasic acid and nylon 12 particles evenly into the reactor, add double-ended amino polyethylene glycol and deuterated trifluoroacetic acid into the reactor, seal it, vacuumize it, and fill it with carbon dioxide. And the initial pressure of the reactor is 0.1MPa.

[0101] Step 2: Heat to make the reaction kettle gradually heat up to 170°C, start stirring, continue to heat up to 190°C, open the exhaust valve, reduce the pressure in the kettle to 1.5MPa, and keep the pressure down slowly and uniformly for 0.6 hours, so that the inside of the reaction kettle The pressure was reduced to normal pressure within 2.2 hours, kept at normal pressure for 0.4 hours, the stirring was stopped, the product was taken out and placed in a cold water tank, and finally dried to obtain the product.

[0102] Step 3: The abo...

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PUM

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Abstract

The invention relates to the technical field of polymer composites and particularly relates to a low-temperature nylon powder material for selective laser sintering. The low-temperature nylon powder material mainly comprises nylon 12 particles, dodecanedioic acid, double amino-terminated polyethylene glycol, deuterated trifluoroacetic acid, an antioxidant, a solvent, a nucleating agent, a plasticizer and a silane coupling agent. The low-temperature nylon powder material is prepared by the following steps: uniformly mixing the dodecanedioic acid and nylon 12 particles and putting into a reaction kettle; adding the double amino-terminated polyethylene glycol and deuterated trifluoroacetic acid into the reaction kettle; heating and starting stirring to obtain a product; putting the product together with the antioxidant, solvent, nucleating agent, plasticizer and silane coupling agent into the reaction kettle, and closing the kettle with a cover; vacuumizing the reaction kettle and introducing nitrogen displacement for protection; starting stirring and reducing the temperature of the kettle body to room temperature; taking out the materials, drying and performing ball milling; and drying the powder to obtain powder with good sphericity and fluidity. The low-temperature nylon powder material provided by the invention has the characteristics of low preheating temperature, wide preheating window, good aging resistance and adaptability to table boards of various specifications.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to a low-temperature nylon powder material for selective laser sintering and a preparation method thereof. Background technique [0002] Additive manufacturing (commonly known as 3D printing, also known as rapid prototyping & manufacturing) technology is a new advanced manufacturing technology involving computer, control, machinery, materials and other sciences. It breaks the traditional process of material deformation molding and removal molding, and adopts the additive molding method of layer-by-layer manufacturing and superimposition, which can theoretically manufacture any complex three-dimensional solid parts. [0003] Selective Laser Sintering (SLS) technology is a current mainstream additive manufacturing technology. Polymer powder material is the earliest and most widely used SLS material. It melts or softens during laser sintering, and crystallizes and ...

Claims

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Application Information

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IPC IPC(8): C08L77/02C08L71/02C08K13/02C08K5/092C08K5/095C08K5/134C08K3/36C08K5/053C08K3/16C08K3/38C08K5/435C08K3/04
CPCC08L77/02C08L2207/04C08K2003/387B33Y70/00C08L71/02C08K13/02C08K5/092C08K5/095C08K3/36C08K5/053C08K5/1345C08K3/16C08K3/38C08K5/435C08K3/04C08K5/134C08K5/54C08K2003/385C08G69/40B29C64/153C08K5/005C08K5/0083C08K5/0016
Inventor 史玉升闫春泽史云松傅轶汪艳魏青松刘洁李晨辉郑立王雁国
Owner GUANGDONG SILVER AGE SCI & TECH CO LTD
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