PREPARATION AND STUDY ON PROPERTIES OF THERMALCONDUCTIVE POLYURETHANE POURING SEALANT

Abstract

Abstract: In this paper, polyurethane pouring sealant was prepared by one-step method using polytetrahydrofuran glycol (PTMG), diphenylmethane diisocyanate (MDI) and spherical alumina. The effects of coupling agent dosage, alumina particle size and filling amount on the properties of polyurethane pouring sealant were studied. The filling amount of Al₂O₃ was determined to be the key factor affecting the thermal conductivity of the pouring sealant by orthogonal experimental design. The thermal conductivity of polyurethane pouring sealant was effectively improved by adding coupling agent. When the same content of Al₂O₃ is added, the thermal conductivity of the pouring sealant filled with 2 μm Al₂O₃ is better. At the same particle size, the thermal conductivity of the pouring sealant increases gradually with the addition of Al₂O₃. The volume resistivity of the pouring sealant decreases with the increase of Al₂O₃ filling, but its insulation performance can still meet the requirements of electronic equipment encapsulation.

Key words: polyurethane pouring sealant, thermal conductivity, alumina

CLC Number:

TB332

ZHANG Bo-wen, MEI Qi-lin, HUANG Yan-kai, XIE Chao. PREPARATION AND STUDY ON PROPERTIES OF THERMALCONDUCTIVE POLYURETHANE POURING SEALANT[J]. Composites Science and Engineering, 2020, 0(2): 101-105.

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