| 摘要 |
PURPOSE:To obtain water-swellable polyvinyl chloride having excellent elastic characteristics and being not easily destroyed by compression under highly water-absorbed state, by kneading polyvinyl chloride with a mixture obtained by kneading a high water-absorbable resin and a plasticizer. CONSTITUTION:The blending ratio of the composition consists of polyvinyl chloride 100pts. a highly water-solubable resin 10-200pts. a plasticizer 20-120pts. and a stabilizer 2-60pts. Using this blending ratio, the highly water- absorbable resin is placed in a mixer, then the plasticizer is supplied into it and the mixture is kneaded for about 20min. Polyvinyl chloride and the stabilizer are then mixed and kneaded for about more than 5min. The water- swellable resin composition thus obtd. is furthermore kneaded on a kneading roller at 120-180 deg.C for 7-8min and then is continuously taken off therefrom in a ribbonlike shape, which is supplied into a strainer extruder or a calender roll to prepare pellets or sheets. |
