Abstract：To improve compatibility of aluminum phosphate and organics,the surface hydrophobic modification of aluminum phosphate powders were researched by solid-state method.The properties of aluminum phosphate powders before and after modification as well as the modification mechanism were analyzed by the test means of FTIR,TG and TFSEM.The results indicate that at thermostatic water bath of 80 ℃,the activation index of aluminum phosphate powders is more than 99% after modified by silane coupling agent with the mass fraction of 6%.The static water contact angle is about 130°.After heated at 200 ℃ for 2 h,the modifying method is transformed from physical adsorption to chemical adsorption.The activation index increases to 100% and the static water contact angle reaches 145°.

Keywords：aluminum phosphate;solid-state method;silane coupling agent;surface hydrophobic modification