A synthetic method of cross-linked sodium polyacrylate is characterized in that 5-6kg of 4 1.7-50% acrylic acid aqueous solution is sequentially added into an open container; 7.6 ~ 14.3% sodium hydroxide aqueous solution 2.38 ~ 4.5 1 kg; 33-38% sodium bicarbonate aqueous solution 6.75-7.88kg; 0. 168 ~ 1% NN'- methylene bisacrylamide aqueous solution 0.25 ~1.5 kg; 0.57 ~ 1% ammonium persulfate aqueous solution1.68 ~ 2.92kg; 0.03-0.13kg sodium chloride solid particles; 0.60-0.75kg of pure acrylic acid solution. Stir the mixed solution until it is completely dissolved, cover the liquid surface with plastic cloth to isolate the air, heat the external water to 70- 100℃, evenly foam the mixed solution after 0.5-2.5 hours, complete the polymerization after 2- 10 minutes, and dry and crush the polymerized sodium polyacrylate hydrogel to obtain the super absorbent resin.
In addition, there are references. N-n methylene bisacrylamide is the most commonly used, and the dosage of crosslinking agent is about 1%.
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