▎ 摘　　要

NOVELTY - Nylon 12-based composite powder comprises 100 pts. wt. nylon 12, 1-6 pts. wt. organic montmorillonite, 0.5-6 pts. wt. mass graphene oxide, and 0.3-2 pts. wt. antioxidant. The dosage of the coupling agent is 0.25-2% of the mass of the graphene oxide. The nylon 12 is divided into the first portion of nylon 12 powder, the second part of the powder and the third portion of powder. The first part is used to pre-intercalate the organometallic to obtain pre-inserted organometallic powder. USE - Nylon 12-based composite powder. ADVANTAGE - The PA12 base composite powder is matched with selective laser sintering (SLS) forming technology, it can prepare PA12 with high heat resistance, and still keeps good heat insulation performance and excellent mechanical property. The micro-structure of sheet-shaped distribution not only can inhibit material deformation to improve the thermal deformation temperature of PA12, but also blocking the possibility of constructing local heat conducting channel in the PA12. The scheme of the invention can achieve one-time integral forming of complicated special-shaped structural parts, has simple process, and flexible operation. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the method for preparing sheet structure heat-resistant piece, which involves: 1. preparing nylon 12 base composite powder then putting the nylon 12 base composite powder into the selective laser sintering device to form the heat-resistant piece of the laminated structure; 2. adding 1-6 pts. wt. of organic montmorillonite into the ethanol solvent the mass of the ethanol montmorillonite is 50- 200 times of the mass of the organic montmorillonite stirring at high speed for 30-90 min to fully disperse, the organic montmorillonite in the ethanol solvent; 3. adding 2-15 pts. wt. of nylon 12 and prepared by dispersing the ethanol montmorillonite in the high pressure reaction kettle raising the temperature to 145℃ under high speed stirring keeping the temperature for 15-60 min naturally, cooling to normal temperature to obtain the mixed solution filtering the mixed solution and placing in a vacuum drying box at 80℃ for 4-12 h and then ball milling for 10-40 min, obtaining the organic montmorillonite powder with grain diameter less than 75 microns pre- inserted layer by a sampling sieve; 4. putting the graphene oxide powder and coupling agent into the high speed mixer the coupling agent mass is 0.25-2 wt.% of the mass of the graphene oxide powder mixing for 30-120 min, the rotating speed is 180 -360 revolutions per min, obtaining the graphene oxide powder processed by coupling agent, 20-30 pts. wt. of nylon 12 powder, 1-6 pts. wt. of pre-inserted organic montmorillonite powder and 0 5-6 pts. wt. of coupling agent processed graphene oxide powder, 0.3-2 pts. wt. antioxidant are put into a high-speed mixer and mixed for 10-50 min at a speed of 180-360 revolutions per minutes to obtain nylon 12 lead powder step four the nylon 12 lead powder and the remaining nylon 12 powder are put into the high-speed mixer and mixed for 30-120min, the rotating speed is 180-360 revolutions per min during this period the flow aid is added into the above- mentioned mixed powder in the high-speed mixer in 3- 8 times and the weight of each addition is equal the nylon 12 composite powder is obtained.