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Preparation method of polyamide 6 powder for laser sintering

A technology of laser sintering and polyamide, applied in the field of preparation of polyamide 6 powder, can solve the problems of low fluidity, low sphericity of powder materials, poor quality effect of laser sintering process, etc., and achieve the effect of reducing temperature gradient

Active Publication Date: 2016-08-17
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition to polyamide 11 and polyamide 12 materials, polyamide 6 is one of the raw materials to be industrialized in the field of laser sintering. In the prior art, the cryogenic pulverization method is often used to obtain polyamide 6 powder materials, but the cryogenic pulverization process can obtain The sphericity of the powder material is not high, the fluidity is low, and the quality effect of the laser sintering process is poor

Method used

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  • Preparation method of polyamide 6 powder for laser sintering
  • Preparation method of polyamide 6 powder for laser sintering
  • Preparation method of polyamide 6 powder for laser sintering

Examples

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Embodiment 1

[0027] A preparation method of polyamide 6 powder for laser sintering, comprising the steps of:

[0028] Step 1: 4 kg of polyamide 6 resin material and 24 kg of solvent are placed in a closed reaction kettle, wherein the solvent is mixed with methanol and water in a ratio of 45:55. The reaction kettle was pumped down to 0.01MPa, and then filled with nitrogen until the pressure inside the kettle was 0.4MPa. Under the condition of stirring, the heat conduction oil outside the reaction kettle was heated to 190°C, and the temperature of the material in the kettle was heated to 155°C and maintained at this temperature for 120min. .

[0029] Step 2: Adjust the cooling rate of the reactor by adjusting the cooling water flow rate of the reactor. The cooling rate of the material in the reactor is about 1.0°C / min. During the cooling process, the temperature outside the reactor is always about 30°C higher than the temperature of the material. When the material temperature is controlled ...

Embodiment 2

[0032] A preparation method of polyamide 6 powder for laser sintering, comprising the steps of:

[0033] Step 1: 4 kg of polyamide 6 resin material and 24 kg of solvent are placed in a closed reaction kettle, wherein the solvent is mixed with methanol and water in a ratio of 45:55. The reaction kettle was pumped down to 0.01MPa, and then filled with nitrogen until the pressure inside the kettle was 0.4MPa. Under the condition of stirring, the heat conduction oil outside the reaction kettle was heated to 190°C, and the temperature of the material in the kettle was heated to 155°C and maintained at this temperature for 120min. .

[0034] Step 2: Adjust the cooling rate of the reactor by adjusting the cooling water flow rate of the reactor. The cooling rate of the material in the reactor is about 1.0°C / min. During the cooling process, the temperature outside the reactor is always about 20°C higher than the temperature of the material. When the material temperature is controlled ...

Embodiment 3

[0037] A preparation method of polyamide 6 powder for laser sintering, comprising the steps of:

[0038] Step 1: 4 kg of polyamide 6 resin material and 24 kg of solvent are placed in a closed reaction kettle, wherein the solvent is mixed with methanol and water in a ratio of 45:55. The reaction kettle was pumped down to 0.01MPa, and then filled with nitrogen until the pressure inside the kettle was 0.4MPa. Under the condition of stirring, the heat conduction oil outside the reaction kettle was heated to 190°C, and the temperature of the material in the kettle was heated to 155°C and maintained at this temperature for 120min. .

[0039] Step 2: Adjust the cooling rate of the reactor by adjusting the cooling water flow of the reactor. The cooling rate of the material in the reactor is about 1.0°C / min. During the cooling process, the temperature outside the reactor is always about 10°C higher than the temperature of the material. When the material temperature is controlled to dr...

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Abstract

The invention provides a preparation method of polyamide 6 powder for laser sintering. The method comprises the following steps: mixing a polyamide 6 resin material and a solvent and putting in a reaction kettle; heating the materials to a reaction temperature in a protective atmosphere; controlling to cool the reaction kettle so that the material temperature is reduced to 70-90 DEG C, and keeping the inside-outside temperature difference in the reaction kettle within + / -25 DEG C in the cooling process; and controlling to quickly cool the materials in the kettle to below 50 DEG C. The polyamide 6 powder particles prepared in the invention have high sphericity and relatively good fluidity and are particularly suitable for the laser sintering technology.

Description

technical field [0001] The invention relates to a preparation method of polyamide powder for laser sintering, in particular to a preparation method of polyamide 6 powder. 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 laser sintering technology to create three-dimensional objects. If the particle size distribution range of the polyamide powder used for sintering is narrow and the particle sphericity is high, the powder has bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/14C08L77/02
CPCC08J3/14C08J2377/02
Inventor 谭锐陈礼文杰斌彭博
Owner HUNAN FARSOON HIGH TECH CO LTD
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