Long-chain nylon and nylon 66 alloy powder material preparation method for sls
A technology of long-chain nylon and alloy powder, applied in the direction of additive processing, can solve the problems of high cost, insufficient mechanical strength, single nylon powder material, etc., to reduce the preparation cost, improve the mechanical strength, good fluidity and dispersion. Effect
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[0037] A method for preparing an alloy powder material of long-chain nylon and nylon 66 for SLS provided by the invention comprises the following steps:
[0038] (1) Select long-chain nylon and nylon 66 particle raw materials with a particle size of 3 to 5 mm and mechanically mix them to obtain a nylon mixture;
[0039] (2) Add antioxidant, compatibilizer and mixed solvent to the nylon mixture in step (1) and pour it into a closed reactor to obtain a mixed solution, then seal the reactor, vacuumize it, and flush it into an inert protection tank gas;
[0040] (3) Stir the mixed solution obtained in step (2) at a speed of 400-500r / min, and at the same time heat the mixed solution to 165-185°C at a speed of 1-2°C / min to ensure that the nylon is completely dissolved in the solvent , and then heat and pressure for 2 to 3 hours;
[0041] (4) Keep the solution obtained in step (3) under stirring at a speed of 400-500r / min, and cool it to room temperature at a speed of 2-4°C / min to ...
Embodiment 1
[0045] (1) 150 grams of particle diameters are respectively taken as nylon 12 and nylon 66 particle raw materials of 3 millimeters, 3 L of mixed solvent and 0.3 grams of composite antioxidant, and 0.3 grams of compatibilizer are dropped into a stainless steel 50 L reactor with jacket, and the reaction The kettle is sealed, vacuumed, and N 2 gas protection.
[0046] Among them, the proportion of the mixed solvent is: 70% ethanol, 0.1% distilled water, 20% ethylene glycol, 9.9% propylene glycol; the proportion of the composite antioxidant is: 1,3,5-trimethyl-2,4, 6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene is 80%, tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenyl bisphosphite 20%; the compatibilizer is selected from acrylonitrile-butadiene-styrene grafted maleic anhydride.
[0047] (2) Stir the mixed solution at a speed of 500r / min, then gradually raise the temperature to 175°C at a speed of 1°C / min to completely dissolve the nylon 12 in the solvent, and keep the heat and p...
Embodiment 2
[0052] (1) Get 90 grams of nylon 12 particle raw materials and 210 grams of nylon 66 particle raw materials with a particle diameter of 4 mm, 3 L of mixed solvent and 0.3 grams of composite antioxidant, and 20 grams of compatibilizers are dropped into a jacketed stainless steel 50 L reactor , seal the reactor, vacuumize, pass N 2 gas protection.
[0053] Among them, the ratio of the mixed solvent is: 85% ethanol, 5% distilled water, 0.1% ethylene glycol, 9.9% propylene glycol; the ratio of the composite antioxidant is: 1,3,5-trimethyl-2,4, 6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene is 60%, 2,2'-ethylenebis(4,6-di-tert-butylphenyl)fluorophosphite 40%; compatibilizer selection styrene grafted maleic anhydride.
[0054] (2) Stir the mixed solution at a speed of 400r / min, and then gradually raise the temperature to 185°C at a speed of 1.5°C / min to completely dissolve the nylon 12 in the solvent, and keep the temperature and pressure for 2.5h.
[0055] (3) Stir vigorously ...
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