Adding organic solvents in water generally reduces the water absorbency. However, different organic solvents have different effects on the water absorbency of the sample. As the organic solvent content increases, the water absorbency decreases continuously. However, the water absorption rate decreases with the increase of different solvent content, which may be due to the different solubility parameters of different solvents in water.
The raw material for the synthesis of sodium polyacrylate superabsorbent resin by reversed-phase suspension method is the optimum ratio of monomer neutralization initiator concentration cross-linker concentration oil-water ratio. The sample synthesized under this condition has a water-absorption rate that is 29%. The presence of trace metal ions in water can significantly reduce the water absorbency of the sample, but the effect of different ions is different.
The presence of organic solvents can also reduce the water absorbency. The influence of different solvents may be related to the solvent-water interaction parameter.
Polyvinyl chloride paste resin is a polyvinyl chloride resin produced by the emulsion method or micro-suspension method. The paste resin is mixed with a plasticizer, and a stable suspension is formed by stirring, that is, polyvinyl chloride plastisol (or polyvinyl chloride plastisol). Polyvinyl chloride plastic plasties can be made into artificial products such as artificial leather, floor leather, toys, wallpaper, automotive interior materials, etc. by scraping, dipping, slushing and other processes.
Because of its simple molding process, processing equipment, low prices, products easy to foam and other advantages have been widely used. In recent years, in the fields of artificial leather, floor leather and other daily necessities, some consumers prefer surface extinction products; changes in market demand have prompted some domestic manufacturers to actively explore and adopt a variety of methods to produce surface matting products.
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