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A preparation method of polyamide 66 powder material for selective laser sintering

A technology of laser sintering and powder materials, which is applied in the field of additive manufacturing, can solve the problems of wide powder particle size distribution, low powder fluidity, poor sphericity, etc., and achieve uniform particle size distribution, concentrated particle size distribution, and faster Effect of crystallization rate

Active Publication Date: 2022-03-29
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main production method of polyamide 66 powder is the low-temperature freezing and crushing process. The principle is to exchange heat between the polymer and the cold source to cool the material to an embrittled state. The impact of the impact finally becomes fine particles, the powder particle size distribution obtained by this process is wide, the yield is low; the sphericity is poor, and the powder fluidity is low

Method used

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  • A preparation method of polyamide 66 powder material for selective laser sintering
  • A preparation method of polyamide 66 powder material for selective laser sintering
  • A preparation method of polyamide 66 powder material for selective laser sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Put 10kg of polyamide 66 material, 50kg of methanol, 50kg of water, and 30g of titanium dioxide into the 100L reactor. Vacuumize the reactor until the pressure is -0.06Mpa, and then pass in an inert gas protection until the pressure inside the reactor is 0.3Mpa, and keep stirring Heating under low temperature makes the temperature in the kettle rise to 160°C, and keep it warm at this temperature for 30 minutes; then use cooling water to cool down, so that the temperature in the kettle drops to 90°C at a cooling rate of 0.8°C / min, and increase the flow of cooling water to make the inside of the kettle The temperature is lowered to room temperature, the material is taken out, centrifuged, dried, and passed through an 80-mesh sieve to obtain a polyamide 66 powder sample. The powder sample is subjected to morphology and DSC tests. The results are as follows: figure 1 and Figure 7 shown.

Embodiment 2

[0037] Put 10kg of polyamide 66 material, 50kg of methanol, 50kg of water, and 30g of calcium carbonate into the 100L reactor. Vacuumize the reactor until the pressure is -0.06Mpa, and then pass inert gas protection until the pressure inside the reactor is 0.3Mpa. Heating under stirring to raise the temperature in the kettle to 160°C, and keep it warm at this temperature for 30 minutes; then use cooling water to cool down, so that the temperature in the kettle drops to 90°C at a cooling rate of 0.8°C / min, and increase the flow of cooling water to make the kettle The internal temperature is lowered to room temperature, the material is taken out, centrifuged, dried, and passed through an 80-mesh sieve to obtain a polyamide 66 powder sample. The powder sample is subjected to morphology and DSC tests, and the results are as follows: figure 2 and Figure 8 shown.

Embodiment 3

[0039] Put 10kg of polyamide 66 material, 45kg of methanol, 55kg of water, and 30g of titanium dioxide into the 100L reactor. Vacuumize the reactor until the pressure is -0.06Mpa, then pass in an inert gas to protect the pressure in the reactor to 0.3Mpa, and keep stirring Heating under low temperature makes the temperature in the kettle rise to 160°C, and keep it warm at this temperature for 30 minutes; then use cooling water to cool down, so that the temperature in the kettle drops to 90°C at a cooling rate of 0.8°C / min, and increase the flow of cooling water to make the inside of the kettle The temperature is lowered to room temperature, the material is taken out, centrifuged, dried, and passed through an 80-mesh sieve to obtain a polyamide 66 powder sample. The powder sample is subjected to morphology and DSC tests. The results are as follows: image 3 and Figure 9 shown.

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Abstract

The invention provides a preparation method of polyamide 66 powder material for selective laser sintering, comprising: mixing polyamide 66 resin and solvent in a closed reaction kettle at a mass ratio of 1:4 to 20, adding an inorganic nucleating agent , evacuate the reactor, then fill it with inert gas protection, heat the material to the maximum reaction temperature of 150-200°C under the condition of continuous stirring, the holding time is 5-300min, and then the material in the kettle is heated at a rate of 0.1-2.0°C / min The cooling rate is lowered to 5-10°C lower than the material precipitation temperature, quickly cooled to room temperature, centrifuged, dried, and sieved to obtain PA66 powder; the following components in mass percentage: PA66 powder 96-99.98%, powder flow aid 0.01-2.0% and 0.01-2.0% of powder antioxidant are mixed and sieved to obtain a polyamide 66 powder material with an average particle diameter of 30-180 μm suitable for selective laser sintering. The polyamide 66 powder material preparation process provided by the invention has low cost, simple and feasible process, and the obtained powder is especially suitable for SLS forming process.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, in particular to a preparation method of polyamide 66 powder material for selective laser sintering Background technique [0002] SLS (Selective Laser Sintering, Selective Laser Sintering) is a method of manufacturing three-dimensional objects by selectively fusing multiple powder layers, which allows processing without tools but only by laser sintering according to the three-dimensional image of the object to be produced Multiple overlapping layers of powder to obtain a three-dimensional 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] At present, there is no mature polyamide 66 powder product for selective laser sintering. In order to further expand the application range of selective laser sintering technology, PA6...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/06C08K13/02C08K3/22C08K3/26C08K3/36C08K5/13C08K5/5393B33Y70/10
CPCC08K3/22C08K3/26C08K3/36C08K5/13C08K5/5393C08K13/02B33Y70/00C08K2201/011C08K2003/2241C08K2003/265C08L2205/24C08L77/06
Inventor 谭锐陈礼彭博杨云龙
Owner HUNAN FARSOON HIGH TECH CO LTD