The invention discloses an aluminum
powder surface modification method. The aluminum
powder surface modification method comprises the following steps of preparing a
silane coupling agent, deionized water and absolute ethyl
alcohol into a
mixed solution according to a certain proportion; and adding the
mixed solution into a reaction container, then adding aluminum
powder, condensing and refluxing, and continuously stirring at 70-80 DEG C for 4-5 hours to obtain
silane coupling agent modified aluminum powder. According to the aluminum powder
surface modification method, the aluminum powder surface treatment method is a
chemical treatment method, the
silane coupling agent is grafted to a aluminum powder surface in a
chemical bond mode, the polarity of the aluminum powder surface is remarkably reduced, agglomeration of the aluminum powder surface in a
polymer substrate is effectively reduced,
dispersity is better, and the contact area between the aluminum powder surface and the
polymer substrate becomes larger; when modified aluminum powder is used in heat-conducting gel, the interfacial strength between the modified aluminum powder and the
polymer substrate is higher; compared with unmodified aluminum powder, the modified aluminum powder has better compatibility with a polymer, so that the heat-conducting gel prepared from the modified aluminum powder has better mechanical properties under the same filler fraction.