The results showed that when the amounts of anhydrous sodium sulfate in paste of starch-acrylic acid graft copolymer were 5%, the viscosity retention of copolymer was about 68.5%.

• 实验结果表明：淀粉-丙烯酸接枝共聚物的糊料中加入5%25无水硫酸钠黏度保留值为68.；5%25；