Aqueous-liquid-absorbable resin, aqueous-liquid-absorbable composition, and absorber material and absorbable object each produced using same
A water-based liquid, absorbent technology, applied in the fields of water-based liquid absorbent articles, water-based liquid-absorbent resins, and water-based liquid absorbers, can solve the problems of low elastic modulus of starch and poor water absorption capacity, and achieve good gel elastic modulus. The effect of excellent amount, excellent absorption capacity and excellent absorption energy
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manufacture example 1
[0165] : Production of a hydrogel of cross-linked polyacrylic acid
[0166] 155 parts (2.15 parts by mole) of acrylic acid (manufactured by Mitsubishi Chemical Corporation, purity 100%), 0.6225 parts (0.0024 parts by mole) of pentaerythritol triallyl ether (manufactured by Daiso Corporation) as an internal crosslinking agent, and deionized 340.27 parts of water were kept at 3°C with stirring and mixing. Nitrogen gas was flowed into the mixture so that the dissolved oxygen concentration was 1 ppm or less, and then 0.62 parts of 1% hydrogen peroxide solution, 1.1625 parts of 2% ascorbic acid solution and 2% of 2,2'-azobis[2-methyl- Polymerization was initiated with 2.325 parts of N-(2-hydroxyethyl)-propionamide] aqueous solution and 1.9 parts of surfactant (A-1) (2 mole adduct of hexadecanoic acid ethylene oxide). After the temperature of the mixture reached 90°C, polymerization was performed at 90±2°C for about 5 hours to obtain 502.27 parts by weight of a crosslinked polyac...
manufacture example 2
[0167] : Production of an aqueous solution of linear polyacrylic acid
[0168] Except not having added pentaerythritol triallyl ether as an internal crosslinking agent, it carried out similarly to manufacture example 1, and obtained 501.65 weight part of aqueous solutions (B1-1) of linear polyacrylic acid.
manufacture example 3
[0169] : Manufacture of aqueous solution (A1-1) of polysaccharide oxides
[0170] 5 parts of starch (MS-3800, manufactured by Nippon Food & Chemical Industry Co., Ltd.) and 100 parts of ion-exchanged water were added and stirred. 32.6 parts of potassium permanganate was dissolved in 500 parts of ion-exchange water, and it added over 6 hours. The pH was maintained at 12 during the addition of 2 equivalents of aqueous sodium hydroxide (NaOH) solution. After the addition of potassium permanganate was terminated, stirring was continued for 2 hours, unreacted potassium permanganate was reduced with sodium sulfite, and manganese dioxide as a by-product was filtered off. The filtrate was purified by diffusion dialysis with ion-exchanged water for 5 days, and then concentrated to obtain a 30% by weight aqueous solution (A1-1) of polysaccharide oxides. The obtained polysaccharide oxide had Mw of 6,000 and an acid value of 700 mgKOH / g.
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