▎ 摘　　要

NOVELTY - Preparing low-contact thermal resistance phase change trigger type thermal interface material involves utilizing 5-90 wt.% thermoplastic elastomer, 1-50 wt.% phase change microcapsule of nano heat conducting filler/phase change material and 5-50 wt.% micron size heat conducting filler, firstly selecting thermoplastic elastomer as matrix material, in the melt blending process, adding 0.5-1.5phr of dicumyl peroxide for crosslinking the thermoplastic elastomer, the blending time is 5-10 minutes, the blending temperature is 170-180degrees Celsius, to obtain the crosslinked thermoplastic elastomer, improving thermal stability and post-swelling degree, selecting the nano heat conducting filler with size of 10-100 nm dispersed in the fused phase change material, improving dispersibility by mechanical stirring and ultrasonic treatment, obtaining the mixture of nano heat conducting filler/phase change material, the content of the nano heat conducting filler is 5-30 wt.%. USE - Method for preparing low-contact thermal resistance phase change trigger type thermal interface material. ADVANTAGE - The method enables to prepare low-contact thermal resistance phase change trigger type thermal interface material with good interface filling property and high heat conductivity, realizing the height of the interface micro-nano gap filling. DETAILED DESCRIPTION - Preparing low-contact thermal resistance phase change trigger type thermal interface material involves utilizing 5-90 wt.% thermoplastic elastomer, 1-50 wt.% phase change microcapsule of nano heat conducting filler/phase change material and 5-50 wt.% micron size heat conducting filler, firstly selecting thermoplastic elastomer as matrix material, in the melt blending process, adding 0.5-1.5phr of dicumyl peroxide for crosslinking the thermoplastic elastomer, the blending time is 5-10 minutes, the blending temperature is 170-180degrees Celsius, to obtain the crosslinked thermoplastic elastomer, improving thermal stability and post-swelling degree, selecting the nano heat conducting filler with size of 10-100 nm dispersed in the fused phase change material, improving dispersibility by mechanical stirring and ultrasonic treatment, obtaining the mixture of nano heat conducting filler/phase change material, the content of the nano heat conducting filler is 5-30 wt.%, obtaining the nanometre heat-conducting filler/phase-change material blend, adding the product prepared into the crosslinked matrix material obtained in batches, the swelling time is 2-20 minutes, the swelling temperature is 150-190degrees Celsius, the molten nano heat-conducting filler/phase-change material can enter into the cross-linked thermoplastic elastomer molecular chain and make it generate swelling, the cross-linked thermoplastic elastomer with high viscosity prevents the nano-heat-conducting filler from entering the thermoplastic elastomer phase, adding 10-50 wt.% micron-sized heat-conducting filler whose size is 5-100 microns to the product, mixing uniformly and using the hot press forming technique to press into the final heat interface material in the 0.1-1mm thickness mould. INDEPENDENT CLAIMS are included for: 1. A preparation method of styrene-ethylene-butylene-styrene /octadecane/boron nitride nano sheet/aluminium oxide phase change trigger type thermal interface material prepared by melt blending method, which involves firstly taking 100 g styrene-ethylene-butylene-styrene, adding 0.5g dichlorophenol to 170degrees Celsius of Banbury mixer, melting and mixing for 5 minutes, respectively taking 5 g of boron nitride nano sheet with size of 20 nm and 10 g octadecane, mixing at 80degrees Celsius, ultrasonically dispersing for 30 min, mechanically stirring for 1 hour, adding the boron nitride nanosheet/octadecane blend obtained to the crosslinked SEBS obtained in batches, in the Banbury mixer at 170degrees Celsius, melting and mixing for 5 minutes to obtain the blend, taking 30 g of spherical aluminium oxide with size of 15microm into the blend, in the internal mixer of 170degrees Celsius, melting and mixing for 5 minutes to obtain the SEBS/octadecane/boron nitride nano sheet / aluminium oxide mixture in the flat vulcanizing machine for 10 min, the pressure is 10MPa, the temperature is 160degrees Celsius, the thickness of the mould is 0. 2 mm, to obtain the final heat interface material. 2. A preparation method for preparing polyolefin elastomers /polyethylene glycol/nano silver/boron nitride micron sheet/ aluminium oxide phase change trigger type thermal interface material by melt blending method, which involves firstly taking 100 g polyolefin, 0.4g dichlorophenol into the mixer at 150degrees Celsius, melting and mixing for 6 minutes to obtain the crosslinked POE, respectively weighing 10 g of nano-silver particles with size of 20 nm, 20 g of polyethylene glycol with molecular weight of 4000, at 60degrees Celsius, ultrasonically dispersing for 30 min, mechanically stirring for 1 hours to obtain the nano silver/polyethylene glycol blend, adding the nano silver/polyethylene glycol blend obtained into the crosslinked POE obtained in batches, in the Banbury mixer at 150degrees Celsius, melting and mixing for 5 minutes to obtain the blend, taking 10 g of spherical aluminium oxide with size of 15microm and 15 g of sheet boron nitride with size of 30microm into the mixture, melting and mixing for 5 minutes, the pressure is 10MPa, the temperature is 150degrees Celsius, the thickness of the mould is 0. 2 mm, to obtain the final heat interface material. DESCRIPTION OF DRAWING(S) - The drawing shows a working diagram of the thermal interface material of a preparation method of low-contact thermal resistance phase change trigger type thermal interface material. (Drawing includes non-English language text).