Polyamide powder for laser sintering and preparation method thereof

A polyamide powder and laser sintering technology, applied in the field of selective laser sintering technology, can solve problems such as inability to achieve effects, and achieve the effects of good powder fluidity, concentrated particle size distribution, and simple and feasible process

Active Publication Date: 2015-03-04
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can better improve some laser sintering properties of polyamide powder, but still can not achieve very satisfactory results

Method used

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  • Polyamide powder for laser sintering and preparation method thereof
  • Polyamide powder for laser sintering and preparation method thereof
  • Polyamide powder for laser sintering and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 3kg of PA1212 pellets and 24kg of ethanol to a 30L magnetically stirred reactor, feed high-purity nitrogen to a pressure of 0.3MPa, and start stirring; raise the temperature in the kettle to 145°C at a speed of 1.5°C / min. Insulate for 1 hour; after the constant temperature is over, use cooling water to lower the temperature to lower the temperature in the kettle to 90℃ at a cooling rate of 2.0℃ / min, then reheat to raise the temperature in the kettle to 110℃, and then cool the temperature in the kettle at a rate of 0.15℃ / min The temperature was lowered to 90°C until the precipitation was completed; the flow rate of cooling water was increased to lower the temperature in the kettle to room temperature, the material was taken out, centrifuged, and the powder solid was vacuum-dried for 8 hours. Gained solid powder properties are shown in Table 1 and figure 1 .

[0024] This embodiment sieving particle size distribution is:

[0025] <32μm: 0.6% (weight)

[0026] <38μm...

Embodiment 2

[0042] Add 3kg of PA1212 pellets and 24kg of ethanol to a 30L magnetically stirred reactor, feed high-purity nitrogen to a pressure of 0.3MPa, and start stirring; raise the temperature in the kettle to 145°C at a speed of 1.5°C / min. Insulate for 1 hour; after the constant temperature is over, use cooling water to lower the temperature in the kettle to 90℃ at a rate of 2.0℃ / min, reheat to raise the temperature in the kettle to 108℃, and then lower the temperature in the kettle at a rate of 0.12℃ / min When the temperature is lowered to 90°C, the precipitation is completed; the flow rate of cooling water is increased to lower the temperature in the kettle to room temperature, the material is taken out, centrifuged, and the powder solid is vacuum-dried for 8 hours. Gained solid powder properties are shown in Table 1 and figure 2 .

Embodiment 3

[0044] Add 3kg of PA1212 pellets and 24kg of ethanol to a 30L magnetically stirred reactor, feed high-purity nitrogen to a pressure of 0.3MPa, and start stirring; raise the temperature in the kettle to 145°C at a speed of 1.5°C / min. Insulate for 1 hour; after the constant temperature is over, use cooling water to lower the temperature in the kettle to 90℃ at a rate of 2.0℃ / min, then reheat to raise the temperature in the kettle to 106℃, and then lower the temperature in the kettle at a rate of 0.09℃ / min When the temperature is lowered to 90°C, the precipitation is completed; the flow rate of cooling water is increased to lower the temperature in the kettle to room temperature, the material is taken out, centrifuged, and the powder solid is vacuum-dried for 8 hours. Gained solid powder properties are shown in Table 1 and image 3 .

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Abstract

The invention discloses a polyamide powder for laser sintering and a preparation method thereof. The preparation method is characterized by comprising rapidly cooling a polyamide solution to a temperature lower than the crystallization temperature of polyamide by 15-20 DEG C, then heating to the crystallization temperature of polyamide, and slowly cooling until polyamide powder is precipitated. The difference value of the initial melting temperature Tmo and the initial crystallization temperature Tco of polyamide powder prepared by employing the method is increased, the powder is narrow in particle size distribution and good in fluidity, and the polyamide powder is especially suitable for selective laser sintering.

Description

technical field [0001] The invention relates to a polyamide powder and a preparation method thereof. The polyamide powder prepared by the method is especially suitable for selective laser sintering technology. 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 is primarily accomplished using thermoplastic polymers. Patents US6136948 and WO9606881 describe this method of manufacturing three-dimensional objects using powdered polymers in detail. [0003] Polyamide powder materials can be used in selective laser sintering technology to create three-dimensional objects. During selective laser sintering of polyamide powder, the polyamide powder is often preheated to a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/04
Inventor 许小曙谭锐范小寒边宏
Owner HUNAN FARSOON HIGH TECH CO LTD
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