This invention discloses a wood-based
composite phase change material and its preparation method, belonging to the field of
phase change material technology. The preparation method of the wood-based
composite phase change material is as follows: wood is
cut and heated in a delignification solution, then removed and washed with water to obtain delignified wood; the delignified wood is added to a modification solution and heated, then removed, washed with water, and dried to obtain pretreated wood;
polyethylene glycol,
citric acid, and
boric acid are mixed, heated, and stirred to obtain a
phase change material; the pretreated wood is impregnated into the
phase change material under vacuum, removed, and dried to obtain the final product; the modification solution is composed of an
ethanol aqueous solution, a modified filler, 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane, and
triethylamine. This invention uses delignification solution and modification solution to pretreat the wood, thereby enabling better bonding with the
phase change material and preventing leakage. The resulting wood-based
composite phase change material has excellent thermal management capabilities and stability.