Superabsorbent polymer
A superabsorbent and polymer technology, applied in the field of excellent physics, can solve the problems of insufficient liquid permeability of superabsorbent polymers, and achieve the effect of improving liquid permeability and excellent absorption performance
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Embodiment 1
[0177] 100 g of acrylic acid, 0.5 g of polyethylene glycol diacrylate (Mw=523) as a crosslinking agent, 83.3 g of 50% caustic soda (NaOH) and 89.8 g of water were mixed to prepare a monomer having a monomer concentration of 45% by weight Composition in aqueous solution.
[0178] Subsequently, 810 g of the aqueous monomer solution was first mixed with 30.54 g of 0.18% ascorbic acid solution and 33 g of 1% sodium persulfate solution, and the mixture was fed together with 30.45 g of 0.15% hydrogen peroxide solution through a continuous polymerization reactor with a kneader. part of the feedstock for polymerization. At this time, the temperature of the polymerization reactor was kept at 80° C., the maximum polymerization temperature was 110° C. and the polymerization time was 1 minute and 15 seconds. Thereafter, kneading was continued, and polymerization and kneading were performed for 20 minutes. Thereafter, the size distribution of the polymer produced is reduced to less than ...
Embodiment 2
[0183] A base polymer powder was prepared in the same manner as in Example 1.
[0184] Thereafter, based on the weight of the classified base polymer powder, 0.05% by weight of hydrophobic silica particles (Aerosil 200) was mixed by directly loading into a high-speed mixer, and the base polymer powder was subjected to drying treatment. Then, a surface treatment liquid containing 0.02% by weight of hydrophobic silica particles (Aerosil 200), 1% by weight of ethylene carbonate, and 4% by weight of ethylene carbonate as a solvent was formed based on the weight of the base polymer powder. of water. The surface crosslinking liquid is sprayed onto the base polymer powder, stirred and mixed at room temperature, so that the surface treatment liquid is evenly distributed on the base polymer powder. Then, the base polymer powder is put into a surface crosslinking reactor and subjected to a surface crosslinking reaction.
[0185] In the surface crosslinking reactor, it was determined t...
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