LOW-TEMPERATURE NYLON POWDER MATERIAL FOR SELECTIVE LASER SINTERING AND PREPARATION METHOD THEREFOR

摘要

The present invention relates to the technical field of polymer composites, in particular to a low-temperature nylon powder material for selective laser sintering. The low-temperature nylon powder material mainly comprises nylon 12 particles, dodecanedioic acid, double amino-terminated polyethylene glycol, deuterated trifluoroacetic acid, antioxidant, solvent, nucleating agent, plasticizer and silane coupling agent. The low-temperature nylon powder material is prepared by the following steps: uniformly mixing the dodecanedioic acid and nylon 12 particles and putting into a reaction kettle; adding double amino-terminated polyethylene glycol and deuterated trifluoroacetic acid into the reaction kettle; heating and starting stirring to obtain a product; putting the product together with antioxidant, solvent, nucleating agent, plasticizer and silane coupling agent into the reaction kettle, and closing the kettle with a cover; vacuumizing the reaction kettle and introducing nitrogen displacement for protection; starting stirring and reducing the temperature of the kettle body to room temperature; taking out the materials, drying and performing ball milling; and drying the powder to obtain powder with good sphericity and fluidity. The low-temperature nylon powder material provided by the present invention has the characteristics of low preheating temperature, wide preheating window, good aging resistance and adaptability to table boards of various specifications.