Method for producing high water absorption resin
A manufacturing method and water-absorbing technology, which is applied in the field of manufacturing water-absorbing resins, can solve problems such as reducing production efficiency, achieve the effects of improving product quality, stabilizing the polymerization reaction process, and improving the operating environment
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Embodiment 1
[0058] 1) Add 1984g of acrylic acid and 2685.3g of water into a 6000c.c nitrogen-substituted container; in addition, weigh 1528.6g of 49% sodium hydroxide aqueous solution, and slowly add the sodium hydroxide aqueous solution into the acrylic acid aqueous solution under ice-cooling Neutralization is carried out; at this time, an aqueous solution with an acid group-containing monomer concentration of 38.6 wt% is obtained, in which 68 mol% of acrylic acid is neutralized into sodium acrylate.
[0059] 2) Add the above-mentioned neutralized acid group-containing monomer aqueous solution and 0.1 g of potassium persulfate: sodium sulfite = 1: 1 (weight ratio) into a horizontal cylindrical prepolymerization reactor equipped with a jacket for mixing and prepolymerization reactions. The reaction temperature was 20° C., the reaction time was 60 minutes, and the viscosity of the obtained prepolymer was 100 cps.
[0060] 3) Add the viscous prepolymer and 9.98g N, N'-bis(2-propenyl)amine ...
Embodiment 2
[0065] Repeat Example 1, but N, N'-bis(2-propenyl)amine is reduced to 0.2 parts by weight for monomer addition. The rest is the same as in Example 1 to obtain a superabsorbent resin, the measured retention force is 29.87g / g, and the residual monomer is 42.6ppm.
Embodiment 3
[0067] Example 1 was repeated, but the degree of neutralization was increased to 75 mol%. The rest is the same as in Example 1 to obtain a superabsorbent resin, the measured retention force is 30.24g / g, and the residual monomer is 53.9ppm.
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