Preparation method of polyamide powder used for selective laser sintering

A polyamide powder and laser sintering technology is applied in the technical field of selective laser sintering, and achieves the effects of simple and feasible process, uniform growth in all directions, and uniform particle size distribution.

Active Publication Date: 2012-04-04
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps prevent the formation of unwanted substances during production when producing high molecular weight polymers called PA6. By adding an organic compound like ammonium sulfate or urea instead of water, this technique makes manufacturing easier without causing problems such as excessive foaming or poor flowability. Additionally, the use of specific types of chemicals allows for better heat transfer between different parts within the reactor chamber while maintaining consistently controllable conditions throughout the entire processing cycle. Overall, these technical improvements improve the quality and performance of the resulting product made from polyamides.

Problems solved by technology

The technical problem addressed in this patents relates to improving the quality control of polymers during selectively LASL process due to their complex shapes and limitations associated therewith such as difficulty in testing them correctly without damaging other components like sensors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add PA1212 pellets 2Kg, ethanol 16Kg, gas phase SiO 2 20g, feed high-purity nitrogen to a pressure of 0.2MPa, start stirring; raise the temperature in the kettle to 145℃ at a speed of 1℃ / min, and keep the temperature at this temperature for 1h; The internal temperature drops to 125°C at a cooling rate of -1.3°C / min, and then drops to 100°C at a rate of -0.1°C / min. After 30 minutes, the precipitation ends, and the temperature is kept at this temperature for 40 minutes; using cooling water The temperature in the kettle was lowered to room temperature, the material was taken out, centrifuged, and the powder solid was dried in vacuum for 10 h.

[0016] Bulk density: 0.36g / cm 3

[0017] Sieve size distribution (DIN ISO 3310-1):

[0018] <32um: 0.4%(weight)

[0019] <38um: 3.4% (weight)

[0020] <45um: 12.3% (weight)

[0021] <53um: 42.8% (weight)

[0022] <63um: 67.2% (weight)

[0023] <75um: 75.2% (weight)

[0024] <90um: 80.5% (weight)

[0025] <106um: 83.3% (we...

Embodiment 2

[0032] Add PA1212 pellets 2Kg, ethanol 16Kg, gas phase SiO 2 40g, feed high-purity nitrogen to a pressure of 0.2MPa, start stirring; raise the temperature in the kettle to 145℃ at a speed of 1℃ / min, and keep the temperature at this temperature for 1h; The internal temperature drops to 125°C at a cooling rate of -1.3°C / min, and then drops to 100°C at a rate of -0.1°C / min. After 30 minutes, the precipitation ends, and the temperature is kept at this temperature for 40 minutes; using cooling water The temperature in the kettle was lowered to room temperature, the material was taken out, centrifuged, and the powder solid was dried in vacuum for 10 h.

[0033] Powder properties are shown in Table 1.

Embodiment 3

[0035] Add PA1212 pellets 2Kg, ethanol 16Kg, gas phase SiO 2 60g, feed high-purity nitrogen to a pressure of 0.2MPa, start stirring; raise the temperature in the kettle to 145℃ at a speed of 1℃ / min, and keep the temperature at this temperature for 1h; after the constant temperature is completed, use cooling water to cool down the kettle The internal temperature drops to 125°C at a cooling rate of -1.3°C / min, and then drops to 100°C at a rate of -0.1°C / min. After 30 minutes, the precipitation ends, and the temperature is kept at this temperature for 40 minutes; using cooling water The temperature in the kettle was lowered to room temperature, the material was taken out, centrifuged, and the powder solid was dried in vacuum for 10 h.

[0036] Powder properties are shown in Table 1.

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Abstract

The invention provides a preparation method of polyamide powder used for selective laser sintering. By employing a precipitation method to, the method comprises the operations of dissolution, cooling, and precipitation so as to obtain solid powder. The method is characterized in that it is carried out in the presence of a heterogeneous nucleating agent, and the cooling process falls into two stages, with the first stage cooled to a temperature higher than a precipitation temperature by 5-25DEG C and the second stage cooled to the precipitation temperature again, and after isothermal precipitation, the heat is preserved for some time. Being simple and feasible, the method provided in the invention can prepare polyamide powder which has uniform particle size distribution and a good flowing property and is suitable for selective laser sintering (SLS).

Description

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Claims

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Application Information

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Owner HUNAN FARSOON HIGH TECH CO LTD
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