Preparation method of polyamide 6 powder material for laser sintering
A laser sintering and polyamide technology, applied in the direction of additive processing, etc., can solve the problems of difficult use of polyamide 6 materials, high melting point, warping and deformation of parts, etc., to achieve improved anti-oxidation effect, high particle sphericity, and warpage Small amount of effect
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Embodiment 1
[0027] Put 9.7kg of polyamide 6 (polyamide 6) materials, 0.3kg of calcium chloride, 30kg of methanol, and 30kg of water into a 100L reactor, feed high-purity nitrogen to a pressure of 0.3MPa, and heat under continuous stirring to raise the temperature in the kettle As high as 155°C, keep warm at this temperature for 60 minutes; then use cooling water to cool down, so that the temperature in the kettle drops to 80°C at a cooling rate of 0.8°C / min, increase the flow of cooling water to reduce the temperature in the kettle to room temperature, and take out the material , centrifuged, dried, and passed through a 100-mesh sieve to obtain a polyamide 6 powder sample. The powder sample was tested by DSC, and its melting point and crystallization temperature are as follows: figure 1 and figure 2 shown.
[0028] Take the above polyamide 6 powder, powder flow aid, and powder antioxidant and mix according to the following ratio: 99 parts of polyamide 6 powder, 0.5 part of fumed silica,...
Embodiment 2
[0030] Put 9.4kg of polyamide 6 material, 0.6kg of calcium chloride, 30kg of methanol, and 30kg of water into the 100L reaction kettle, feed high-purity nitrogen gas to a pressure of 0.3MPa, and heat under continuous stirring to raise the temperature in the kettle to 155°C. Insulate at this temperature for 60 minutes; then use cooling water to cool down, so that the temperature in the kettle drops to 80℃ at a cooling rate of 0.8℃ / min, increase the flow of cooling water to reduce the temperature in the kettle to room temperature, take out the materials, centrifuge, and dry , Through a 100-mesh sieve, the polyamide 6 powder sample can be obtained, and the powder sample is tested by DSC, and its melting point and crystallization temperature are as follows: figure 1 and figure 2 shown.
[0031] Take the above polyamide 6 powder, powder flow aid, and powder antioxidant and mix according to the following mass ratio: 99 parts of polyamide 6 powder, 0.5 part of fumed silica, 2,6-di-...
Embodiment 3
[0033] Put 9.1kg of polyamide 6 material, 0.9kg of calcium chloride, 30kg of methanol, and 30kg of water into a 100L reaction kettle, feed high-purity nitrogen gas to a pressure of 0.3MPa, and heat under continuous stirring to raise the temperature in the kettle to 155°C. Insulate at this temperature for 60 minutes; then use cooling water to cool down, so that the temperature in the kettle drops to 80℃ at a cooling rate of 0.8℃ / min, increase the flow of cooling water to reduce the temperature in the kettle to room temperature, take out the materials, centrifuge, and dry , Through a 100-mesh sieve, the polyamide 6 powder sample can be obtained, and the powder sample is tested by DSC, and its melting point and crystallization temperature are as follows: figure 1 and figure 2 shown.
[0034] Take the above polyamide 6 powder, powder flow aid, and powder antioxidant and mix according to the following mass ratio: 99 parts of polyamide 6 powder, 0.5 part of fumed silica, 2,6-di-te...
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