Abstract: In order to improve the surface property of basic magnesium sulfate whiskers and its compatibility with organic matrix material, study on the surface modification of self-made basic magnesium sulfate whiskers was made by chemical coating method, with the activation index and contact angle as the evaluation indicators for modification effect.The results indicate that the suitable modifier for basic magnesium sulfate whiskers is potassium oleate.At a potassium oleate dosage of 2%, pulp concentration of 4%, modification time of 30 min, modification temperature of 80 ℃, and an agitation speed of 600 r/min, a good surface modification effect can be achieved, with the activation index of the modified basic magnesium sulfate whiskers reaching 99.35% and the contact angle being 126.8°.

Key words: Basic magnesium sulfate whiskers, Surface modification, Chemical coating method