US 12,065,607 B1
Thermochromic silicone rubber composite heat dissipation pad and preparation method thereof
Junwen Ren, Chengdu (CN); Zi Wang, Chengdu (CN); Shenli Jia, Chengdu (CN); Lihua Zhao, Chengdu (CN); Huachao Wei, Chengdu (CN); Lichuan Jia, Chengdu (CN); Guoqing Jiang, Chengdu (CN); and Ruichi Zeng, Chengdu (CN)
Assigned to SICHUAN UNIVERSITY, Chengdu (CN)
Filed by SICHUAN UNIVERSITY, Sichuan (CN)
Filed on Dec. 25, 2023, as Appl. No. 18/395,733.
Claims priority of application No. 202311001764.8 (CN), filed on Aug. 10, 2023.
Int. Cl. C09K 5/14 (2006.01); C08J 3/205 (2006.01); C08K 3/38 (2006.01); C08K 9/02 (2006.01); C08K 9/04 (2006.01); C09C 3/00 (2006.01); C09C 3/04 (2006.01); C09C 3/08 (2006.01); C09K 9/00 (2006.01)
CPC C09K 5/14 (2013.01) [C08J 3/2056 (2013.01); C08K 9/02 (2013.01); C08K 9/04 (2013.01); C09C 3/006 (2013.01); C09C 3/048 (2013.01); C09C 3/08 (2013.01); C09K 9/00 (2013.01); C01P 2004/03 (2013.01); C01P 2004/24 (2013.01); C01P 2006/32 (2013.01); C08J 2383/04 (2013.01); C08K 2003/385 (2013.01); C08K 2201/001 (2013.01); C08K 2201/011 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for preparing a silicone rubber composite heat dissipation pad, comprising:
S1: preparing boron nitride nanosheet powder;
S2: grafting a hydroxyl group on a surface of the boron nitride nanosheet powder to produce hydroxyl-functionalized boron nitride nanosheet powder;
S3: dispersing the hydroxyl-functionalized boron nitride nanosheet powder into deionized water, stirring evenly, pouring it into a specialized container,
wherein the specialized container comprises a square polytetrafluoroethylene cassette having an upper opening and a side opening, wherein a slot is provided at an edge of the side opening, and a brass baffle plate is mounted in the slot to seal the side opening of the cassette, thereby forming a square container with only the upper opening, using liquid nitrogen to pre-freeze for 50-70 s and then transferring the specialized container to a freeze dryer, freeze-drying for 48 h at a temperature of −40° C., removing the specialized container from the freeze dryer to warm up the specialized container to room temperature, and obtaining a boron nitride nanosheet skeleton arrayed in a horizontal direction;
S4: uniformly dispersing thermochromic nanoparticles in acetone to obtain a dispersion, mixing the dispersion with liquid silicone rubber and stirring until the acetone is completely evaporated, adding a silicone rubber curing agent to continue stirring evenly, and obtaining a liquid silicone rubber pre-cure solution;
S5: pouring the liquid silicone rubber pre-cure solution into a container containing the boron nitride nanosheet skeleton, placing the container in a vacuum environment, so that the liquid silicone rubber pre-cure solution is fully immersed in an interior of the boron nitride nanosheet skeleton while removing air bubbles; and
S6: curing the liquid silicone rubber pre-cure solution containing the boron nitride nanosheet skeleton obtained in step S5 at elevated temperature under atmospheric pressure to obtain a flexible silicone rubber composite heat dissipation pad with functionalized boron nitride as a support and the thermochromic nanoparticles uniformly distributed inside.