Method for producing water-absorbent resin particles
A technology of resin particles and water absorption, applied in the direction of absorbent pads, medical science, bandages, etc., to achieve the effect of excellent water absorption capacity
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Embodiment 1
[0100] A 2 L round bottom cylindrical detachable with 100 mm internal diameter, equipped with reflux condenser, dropping funnel, nitrogen inlet tube, stirrer and stirring blades (two sets of four inclined paddle-like blades each with 50 mm blade diameter) A flask was used in this example. 321 g (472 ml) of n-heptane was placed in this flask, and 0.92 g of glyceryl acetate monolaurate (Riken Vitamin Co., Ltd. (Riken Vitamin Co., Ltd.), PoemG-002) having an HLB of 2.0 was added thereto as Dispersion stabilizer. The mixture was heated to 80°C with stirring to dissolve the dispersion stabilizer, followed by cooling to 65°C.
[0101] 92 g (1.03 moles) of an 80.5% by mass aqueous acrylic acid solution and 51.2 g of ion-exchanged water were placed in a 500 mL conical flask (Erlenmeyer flask), and 102.9 g of a 30% by mass aqueous sodium hydroxide solution was added dropwise thereto under external cooling To thereby neutralize 75 mol % of the acid groups. Thereafter, 0.27 g of hydro...
Embodiment 2
[0105] A 2 L round bottom cylindrical detachable with 100 mm internal diameter, equipped with reflux condenser, dropping funnel, nitrogen inlet tube, stirrer and stirring blades (two sets of four inclined paddle-like blades each with 50 mm blade diameter) A flask was used in this example. 321 g (472 ml) of n-heptane was placed in this flask, followed by adding 0.92 g of glyceryl citrate monostearate (Taiyo Kagaku Co., Ltd. (Taiyo Kagaku Co., Ltd.) ), Sunsoft No. 621B) and 0.92 g of a maleic anhydride-modified ethylene-propylene copolymer (Mitsui Chemicals, Inc., Hi-WAX 1105A) as a polymeric dispersion stabilizer. The mixture was heated to 80°C with stirring to dissolve the dispersion stabilizer, followed by cooling to 65°C.
[0106] 92 g (1.03 mol) of an 80.5% by mass aqueous acrylic acid solution and 51.2 g of ion-exchanged water were placed in a 500 mL Erlenmeyer flask, and 102.9 g of a 30% by mass aqueous sodium hydroxide solution was added dropwise thereto under external ...
Embodiment 3
[0110] A 2 L round bottom cylindrical detachable with 100 mm internal diameter, equipped with reflux condenser, dropping funnel, nitrogen inlet tube, stirrer and stirring blades (two sets of four inclined paddle-like blades each with 50 mm blade diameter) A flask was used in this example. 321 g (472 ml) of n-heptane was placed in this flask, followed by adding 0.92 g of glyceryl acetate monolaurate (Riken Vitamin Co., Ltd.) having an HLB of 2.0 as a dispersion stabilizer , Poem G-002) and 0.92 g of a maleic anhydride-modified ethylene-propylene copolymer (Mitsui Chemicals, Inc., Hi-WAX 1105A) as a polymeric dispersion stabilizer. The mixture was heated to 80°C with stirring to dissolve the dispersion stabilizer, followed by cooling to 65°C.
[0111] 92 g (1.03 mol) of an 80.5% by mass aqueous acrylic acid solution and 51.2 g of ion-exchanged water were placed in a 500 mL Erlenmeyer flask, and 102.9 g of a 30% by mass aqueous sodium hydroxide solution was added dropwise theret...
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