Process for production of water-absorbable resin
A manufacturing method, water-absorbent technology, applied in the field of water-absorbent resin
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manufacture example 1
[0094] A round-bottom cylindrical-type detachable flask with an inner diameter of 110 mm having a reflux cooler, a dropping funnel, a nitrogen gas introduction tube, and a stirring paddle was prepared. Measure 340 g of n-heptane in the flask, add HLB3 sucrose stearate (manufactured by Mitsubishi Chemical Foods Co., Ltd., Ryoto sugar ester S-370) 0.92 g, maleic anhydride modified ethylene-propylene copolymer (Mitsui Chemicals Co., Ltd. Prepared, Hi-wax 1105A) 0.92g, heated up to 80°C while stirring to dissolve the surfactant, then cooled to 50°C.
[0095] In addition, 92 g (1.02 moles) of an 80 mass % acrylic acid aqueous solution was weighed in a 500 mL Erlenmeyer flask, and 146.0 g of a 21 mass % sodium hydroxide aqueous solution was added dropwise while cooling from the outside to neutralize 75 mol %. 0.11 g (0.41 mmol) of potassium persulfate and 9.2 mg (0.06 mmol) of N,N'-methylenebisacrylamide were added and dissolved to prepare the monomer aqueous solution in the first s...
manufacture example 2
[0101] A round-bottom cylindrical-type detachable flask with an inner diameter of 110 mm having a reflux cooler, a dropping funnel, a nitrogen gas introduction tube, and a stirring paddle was prepared. Measure 340 g of n-heptane in the flask, add 0.92 g of hexaglycerol monobehenate (manufactured by NOF Corporation, NonionGV-106) of HLB13.1, maleic anhydride modified ethylene-propylene copolymer (Mitsui Chemicals Made by the company, Hi-wax 1105A) 0.92 g, heated up to 80°C while stirring to dissolve the surfactant, and then cooled to 50°C.
[0102] In addition, 92 g (1.02 moles) of an 80 mass % acrylic acid aqueous solution was weighed in a 500 mL Erlenmeyer flask, and 146.0 g of a 21 mass % sodium hydroxide aqueous solution was added dropwise while cooling from the outside to neutralize 75 mol %. 0.11 g (0.41 mmol) of potassium persulfate and 9.2 mg (0.06 mmol) of N,N'-methylenebisacrylamide were added and dissolved to prepare the monomer aqueous solution in the first step.
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Embodiment 1
[0108] 50 g of the water-absorbent resin precursor (A1) obtained in Production Example 1 was added to a round-bottomed cylindrical detachable flask with an inner diameter of 110 mm having a stirrer, a stirring paddle, a reflux cooler, a dropping funnel, and a nitrogen gas introduction tube (for Theoretical amount of water-soluble ethylenically unsaturated monomer used to obtain the precursor: 0.52 mol), 80 g of n-heptane. After raising the internal temperature to 80° C., 7.5 g of water was added, and the same temperature was maintained for 10 minutes.
[0109] Then, 10.0 g (5.6 mmol) of a 5% carbodihydrazide aqueous solution was added as a post-crosslinking agent, and mixed. This mixture was heated in an oil bath at 125° C., and post-crosslinking reaction was performed for 1 hour while water and n-heptane in the obtained mixture were distilled off and dried to obtain 51.5 g of the water-absorbent resin of Example 1.
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