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Preparation method of poly(urethane-urea-amide) elastomer powder for selective laser sintering, and product

A laser sintering and selective technology, applied in the field of additive manufacturing, can solve the problems of poor product flexibility, resilience and water resistance, poor antistatic property, narrow printing window, etc., achieve good thermal stability, low water absorption, printing fast effect

Pending Publication Date: 2021-11-19
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It aims to solve the problems of single polymer powder material for SLS printing, easy to produce warping, smoke, narrow printing window, poor antistatic property, poor flexibility, resilience and water resistance of the product

Method used

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  • Preparation method of poly(urethane-urea-amide) elastomer powder for selective laser sintering, and product
  • Preparation method of poly(urethane-urea-amide) elastomer powder for selective laser sintering, and product
  • Preparation method of poly(urethane-urea-amide) elastomer powder for selective laser sintering, and product

Examples

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Embodiment 1

[0039] This embodiment provides a poly(urethane-urea-amide) elastomer powder for selective laser sintering. The poly(urethane-urea-amide) elastomer is polyamide 1212 with double-terminal amino group and isocyanate A segmented block copolymer composed of polyurethane, wherein the polyurethane is composed of 1,6-hexamethylene diisocyanate and polytetrahydrofuran ether diol; the relative molecular weight of the polyamide 1212 is 1000, and the relative molecular weight of polytetrahydrofuran ether diol for 2000.

[0040] Its preparation method comprises the following steps:

[0041] 1) Take 10kg of poly(urethane-urea-amide) elastomer pellets and pre-cool with liquid nitrogen. When the freezing temperature reaches -100°C, keep it for 5 minutes, then turn on the freezer grinder and grind it mechanically. The crushing temperature is -100°C , the frequency of the cutter head is 45Hz, and the final material is discharged to obtain 9.5kg coarse powder;

[0042] 2) Put the powder into ...

Embodiment 2

[0046] This embodiment provides a poly(urethane-urea-amide) elastomer powder for selective laser sintering and its preparation method. The only difference from Example 1 is that the relative molecular weight of the polyamide 1212 is 500, The relative molecular weight of polytetrahydrofuran ether glycol is 750. The resulting product was labeled PUUA2.

[0047] PUUA2 has an angle of repose of 45° and a bulk density of 0.5g / cm 3 .

Embodiment 3

[0049] This embodiment provides a poly(urethane-urea-amide) elastomer powder for selective laser sintering and its preparation method. The only difference from Example 1 is that the relative molecular weight of the polyamide 1212 is 5000, The relative molecular weight of polytetrahydrofuran ether glycol is 5000. The resulting product was labeled PUUA3.

[0050] The angle of repose of PUUA3 is 42°, and the bulk density is 0.3g / cm 3 .

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Abstract

The invention belongs to the technical field of additive manufacturing, and discloses a poly(urethane-urea-amide) elastomer powder for selective laser sintering, and a preparation method thereof. The elastomer powder is a segmented block copolymer composed of polyamide and polyurethane, and the polyurethane is composed of diisocyanate and polyether and / or polyester. The preparation method comprises the following steps: 1) pre-cooling poly(urethane-urea-amide) elastomer granules by liquid nitrogen, and then crushing the pre-cooled poly(urethane-urea-amide) elastomer granules; 2) screening the powder, wherein the selection range of the particle size of the powder is 0-300 [mu]m; and 3) uniformly mixing the screened poly(urethane-urea-amide) elastomer powder with the flow aid and the antioxidant according to a certain mass ratio to obtain the poly(urethane-urea-amide) elastomer powder for selective laser sintering printing. The product is good in fluidity, wide in printing window, antistatic and excellent in product mechanical property and water resistance. The material can be applied to the fields of aerospace, medical orthopedics, sports equipment and the like.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a method for preparing poly(urethane-urea-amide) elastomer powder for selective laser sintering and an elastomer powder product obtained by the method. Background technique [0002] Selective laser sintering (SLS) is a typical 3D printing technology that uses powder as raw material. Point-by-point, line-by-line, and surface-by-surface fusion and consolidation to produce 3D solids. Compared with other 3D printing technologies, SLS has significant advantages such as high forming precision, complex and diverse structures that can be formed, and no need for additional support. It is widely used in aerospace, biomedical, automobile manufacturing, sports equipment, mold casting and other fields. [0003] Thermoplastic elastomer (TPE) has both the elasticity of rubber and the repeated processing performance of thermoplastics, and is known as "the third genera...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08L75/06C08L75/02C08K3/36C08K5/134B33Y70/10C08G18/60C08G18/48C08G18/42
CPCC08K3/36C08K5/1345B33Y70/10C08G18/603C08G18/4054C08G18/4854C08G18/4825C08G18/4233C08K2201/011C08L75/08C08L75/06C08L75/02
Inventor 付鹏李震梅树翔刘民英赵清香崔喆张晓朦庞新厂
Owner ZHENGZHOU UNIV
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