PVA MANUFACTURER---LIWEI CHEMICAL CO. LTD

Dissolving Method of PVA


PVA should be put into the vessel little by little, so as to prevent the formation of swelling lumps which are very difficult to completely dissolve.

(1)Fully hydrolyzed PVA

Fully hydrolyzed PVA disperse easily in water without lumps because of low solubility at room temperature. First charge the vessel with suitable amount water. Next charge PVAwith stirring at room temperature and then heat up to 95℃. PVAis dissolved completely after stirring for 30 to90 minutes, depending on the effectiveness of stirrer and amount of PVA.

(2)Partially hydrolyzed PVA

Partially hydrolyzed PVA is charged very with stirring at room temperature and then heat up to 90 ℃. PVA is dissolved completely after stirring for 30 to 60 minutes. It is good to increase the temperature to save dissolution time, because the higher the temperature of solution, the more likelihood of increases in the dissolution rate. Partially hydrolyzed PVAis more likely to produce foam, so rapidly increased temperature or stirring is to be avoided.