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Copolymerized nylon powder material for selective laser sintering and preparation method thereof

A technology of copolymerized nylon and powder materials, which is applied in the field of additive manufacturing, can solve the problems of limitation and high melting point, and achieve the effects of reduced production cost, good toughness and wide sintering window

Active Publication Date: 2021-07-02
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Short carbon chain nylon has higher strength and cheaper price, but its high melting point and better crystallization performance limit its application in SLS molding process

Method used

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  • Copolymerized nylon powder material for selective laser sintering and preparation method thereof
  • Copolymerized nylon powder material for selective laser sintering and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Add PA1010 salt, caprolactam, molecular weight modifier, deionized water, and antioxidant into the polymerization kettle. Wherein the mass ratio of PA1010 salt and caprolactam is 3:7 (calculated by 10 parts), and the ratio of the sum of the mass of PA1010 salt and caprolactam to the molecular weight modifier, deionized water, and antioxidant quality is 88.4%: 0.8%: 10 %: 0.8%; airtight, vacuumize, and then pass in carbon dioxide gas to protect 0.18MPa, raise the temperature to 210°C, the pressure reaches 1.5MPa, keep the pressure for 0.5h, then slowly release the gas to normal pressure, raise the temperature to 250°C and keep the reaction for 2.5h , stop heating, water-cool the strands to discharge, pelletize, and obtain copolymerized nylon pellets.

[0028] Step 2: Prepare nylon copolymer powder by cryogenic crushing. In the crushing process, the crushing temperature in the crushing chamber is controlled at -125±5°C, the rotor clearance is adjusted to 0.5mm, th...

Embodiment 2

[0032] Step 1: Add PA1010 salt, caprolactam, molecular weight modifier, deionized water, and antioxidant into the polymerization kettle. Wherein the mass ratio of PA1010 salt and caprolactam is 7:3 (according to 10 parts), and the ratio of PA1010 salt, the mass ratio of caprolactam and molecular weight modifier, deionized water, antioxidant quality is 79.2%: 0.4%: 20 %: 0.4%; airtight, vacuumize, and then pass into carbon dioxide gas protection 0.18MPa. Raise the temperature to 220°C, the pressure reaches 1.6MPa, keep the pressure for 1h, then slowly release the air to normal pressure, raise the temperature to 260°C and keep the reaction for 1h, stop heating, water-cool the strands to discharge, pelletize, and obtain copolymerized nylon pellets.

[0033] Step 2: Prepare nylon copolymer powder by cryogenic crushing. In the crushing process, the crushing temperature in the crushing chamber is controlled at -130±5°C, the rotor clearance is adjusted to 2.0mm, the main engine speed...

Embodiment 3

[0037] Step 1: Add PA1010 salt, PA66 salt, molecular weight regulator, deionized water, and antioxidant into the polymerization kettle. Wherein the mass ratio of PA1010 salt and PA66 salt is 3:7 (according to 10 parts), and the ratio of the mass sum of PA1010 salt and PA66 salt to molecular weight regulator, deionized water and antioxidant mass is 68.8%: 0.6% : 30%: 0.6%; airtight, vacuumize, and then pass through carbon dioxide gas protection 0.18MPa. Raise the temperature to 230°C, the pressure reaches 1.7MPa, keep the pressure for 1.5h, then slowly release the air to normal pressure, raise the temperature to 270°C and keep the reaction for 1.5h, stop heating, water-cool the strips, discharge, pelletize, and obtain copolymerized nylon pellets .

[0038] Step 2: Prepare nylon copolymer powder by cryogenic crushing. In the crushing process, the crushing temperature in the crushing chamber is controlled at -140±5°C, the rotor gap is adjusted to 1.5mm, the main engine speed is ...

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Abstract

The invention provides a copolymerized nylon powder material for selective laser sintering and its preparation method. By using the principle of copolymerization reaction, a short-chain nylon raw material and a long-carbon chain nylon raw material are subjected to a copolymerization reaction to obtain a copolymerized nylon resin. , The copolymerized nylon resin is subjected to a cryogenic crushing process, dried and sieved, and flow aids and antioxidants are added to obtain a copolymerized nylon material for selective laser sintering. The preparation method of the present invention has simple process and is easy to control. The particle size of the copolymerized nylon powder of the present invention has the characteristics of narrow particle size distribution, can be well used for secondary molding, and is suitable for the field of additive manufacturing.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a copolymerized nylon powder material for selective laser sintering and a preparation method thereof. Background technique [0002] Selective laser sintering (Selective Laser Sintering, SLS) technology has begun to be applied in industrial production. Different from the traditional subtractive process, splicing and combined molding methods, the selective laser sintering process uses the method of additive manufacturing to process materials. SLS technology is not affected by the shape of the material and can manufacture complex structures, so it is widely used in the fields of automobiles, medical care, construction and aerospace. [0003] Nylon, a semi-crystalline polymer with a wide sintering window, has been widely used in SLS technology. Since long carbon chain nylon has a lower melting point and lower crystallinity than short carbon chain nylon, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/28C08K13/02C08K5/526C08K5/13C08K3/36C08K3/22C08K5/20B33Y70/10C08J3/12C08L77/06
CPCB33Y70/00C08G69/28C08J3/12C08J2377/06C08K3/22C08K3/36C08K5/13C08K5/20C08K5/526C08K13/02C08K2003/2227C08K2003/2241
Inventor 文杰斌陈礼杨云龙冯晓宏
Owner HUNAN FARSOON HIGH TECH CO LTD
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