A kind of selective laser sintering polyimide powder and its preparation method
A technology of laser sintering molding and polyimide powder, which is applied in the direction of additive processing, etc., can solve the problems of not reaching the fineness of SLS material molding, the price is difficult to promote and use on a large scale, and the particle size of materials is large, so as to meet the selection requirements The effect of precise laser sintering molding process requirements, broadening the solvent system, and uniform particle size distribution
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Embodiment 1
[0042] A preparation method for selective laser sintering molding polyimide powder, comprising the steps of:
[0043] 1) Under the protection of nitrogen or argon, add 1.0814g (10mmol) of p-phenylenediamine into 23g of 1-butyl-3-methylimidazolium bromide solvent (15% solid content), heat up to 50°C and stir to fully dissolve it Afterwards, cool to room temperature for subsequent use;
[0044] 2) Add 2.9422g (10mmol) of 3,3',4,4'-biphenyltetracarboxylic dianhydride to the solution obtained in step 1) in batches, the interval between each batch is 30min, and then gradually raise the temperature to 180°C In the process of gradually heating up, firstly, the temperature is raised from normal temperature to 100°C at a rate of 20°C / min, and then the temperature is kept at 20°C for 20 minutes until the temperature reaches 180°C. After 8 hours of continuous reaction, it is washed and dried in turn. During the drying process, first add an appropriate amount of methanol and deionized wa...
Embodiment 2
[0046] A preparation method for selective laser sintering molding polyimide powder, comprising the steps of:
[0047] 1) Under the protection of nitrogen or argon, add 2.1628g (20mmol) of p-phenylenediamine into 45g of 1-butyl-3-methylimidazolium bromide solvent (solid content 5%), raise the temperature to 50°C and stir to fully dissolve it Afterwards, cool to room temperature for subsequent use;
[0048] 2) Add 5.8844g (20mmol) of 3,3',4,4'-biphenyltetracarboxylic dianhydride to the solution obtained in step 1) in batches, the interval between each batch is 20min, and then gradually raise the temperature to 180°C In the process of gradually heating up, firstly, the temperature is raised from normal temperature to 100°C at a rate of 20°C / min, and then the temperature is kept at 20°C for 20 minutes until the temperature reaches 180°C. After 8 hours of continuous reaction, it is washed and dried in turn. During the drying process, first add an appropriate amount of methanol and...
Embodiment 3
[0050] A preparation method for selective laser sintering molding polyimide powder, comprising the steps of:
[0051] 1) Under nitrogen or argon protection, add 1.2415g (5mmol) 3,4'-diaminodiphenylsulfone and 1.2415g (5mmol) 4,4'-diaminodiphenylsulfone to 25.2977g 1-butyl-3 -In the methylimidazolium bromide solvent (solid content 15%), heat up to 50°C and stir to make it fully dissolved, then cool to normal temperature for later use;
[0052] 2) Add 1.9813g (10mmol) of butane-1,2,3,4-tetracarboxylic dianhydride into the solution obtained in step 1) in batches, the interval between each batch is 40min, and then gradually raise the temperature to 180°C, In the process of gradually heating up, firstly, the temperature is raised from normal temperature to 100°C at a rate of 20°C / min, and then the temperature is kept at 20°C for 20 minutes until the temperature reaches 180°C. After 12 hours of continuous reaction, it is washed and dried in turn. During the treatment process, first...
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