Preparation method of high-hydroscopicity resin
A technology of superabsorbent resin and manufacturing method, which is applied in the direction of chemical instruments and methods, mixers, mixers with rotating stirring devices, etc., can solve the problems of excessive decrease in retention force and performance degradation, and achieve shortened residence time, Optimum absorption multiple and reduced range of eddy current generation
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Embodiment 1
[0041] 1) Weigh 29.3g of 48% sodium hydroxide aqueous solution, slowly add 45.7g of water and 33g of acrylic acid into a 250c.c conical flask for neutralization, the time for adding drops is 2 hours, and keep the neutralization reaction system bottle The temperature inside is within the range of 20°C to 40°C; at this time, an aqueous solution with a monomer concentration of 42wt% is obtained, in which 70mol% (molar ratio) of acrylic acid is partially neutralized to sodium acrylate.
[0042] 2) Add 0.035g of polyoxyethylene glyceryl triacrylate to the partially neutralized acrylic acid solution, and maintain the temperature at about 20°C.
[0043] 3) Add 0.014g of L-ascorbic acid, 1.33g of sodium bisulfite and 1.12g of hydrogen peroxide to start the reaction, and the reaction time is 25 minutes.
[0044] 4) After the reaction, the superabsorbent resin is cut into gels with a diameter of less than 2 mm by using a cutting mill.
[0045] 5) Dry at 130° C. for 2 hours; use a sieve...
Embodiment 2
[0049] Repeat Example 1, but step 6 is changed to add 0.6g of ethylene glycol carbonate / water / methanol=1 / 1 / 1 (weight ratio) solution, the rest is the same as Example 1, superabsorbent resin can be obtained, and the retention force is measured 29.26g / g, 20g / cm 2 Water absorption rate under pressure 31.43g / g, 49g / cm 2 The water absorption rate under pressure is 24.33g / g. Take this super absorbent resin and pour it into a combined screen of 850μm, 600μm, 300μm, 250μm, 180μm, and 150μm. >600μm accounts for 32.5%, >300μm accounts for 43.5%, >250μm accounts for 15.4%, >180μm accounts for 6.4%, >150μm accounts for 0.8%, 2 Water absorption rate under pressure 32.1g / g, 49g / cm 2 The water absorption rate under pressure is 23.1g / g.
Embodiment 3
[0051] Repeat Example 1, but step 6 is changed to add ethylene glycol carbonate / water / sorbitol polyglycidyl ether=1 / 1 / 0.5 (weight ratio) solution 0.45g, all the other are the same as Example 1, obtain superabsorbent resin , the measured retention force is 31.48g / g, 20g / cm 2 Water absorption rate under pressure 30.47g / g, 49g / cm 2 The water absorption rate under pressure is 22.18g / g. Take this super absorbent resin and pour it into a combined screen of 850μm, 600μm, 300μm, 250μm, 180μm, and 150μm. >600μm accounts for 23.3%, >300μm accounts for 35.4%, >250μm accounts for 15.6%, >180μm accounts for 19.1%, >150μm accounts for 4.2%, 2 Water absorption rate under pressure 30.14g / g, 49g / cm 2 The water absorption rate under pressure is 21.3g / g.
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