摘要
本试验利用现代测试手段比较研究了国产5种高吸水性树脂,区分出吸水与溶胀两种不同性质.一般所称的吸水量实际是溶胀度。水中溶有盐类时,强烈降低其溶胀度。试验证明,在田间其吸水量和溶胀度不如报道的多,吸水力也较弱,大部分小于1bar。无论是所吸或溶胀的水皆易供作物利用,但也易被周围较干土壤吸收。本试验为正确使用这类高吸水剂提供了依据。
5 species of so-called'high water retaining synthetic resins'manufactured by different laboratories and factories in China were employed for the study. Two mechanisms of water retention by thoes synthetic resins were found:absorp- tion and imbibition.Absorption is a very slow process.It requires a length of several months to attain equilibrium.The amount of absorption(absorbing capacity,g/g)ranges from 30-70 or even less.Imbibition in distilled water may attain to a value of several hundred times over the weight of sample used(322- 762g/g).Solute contents of water,particularly at lower concentrations,e.g.around 0.1%,severely reduce the amounts of absorption and imbibition water.Amount of imbibition may reduce to 20-40% of water that imbibed in distilled water. Most of the absorbed and imbibed water are retained at low suctions(0.1 to 0.5 bar),which are readily available to crops and easily removed by neighbouring dry soils.
关键词
高吸水性
树脂
吸水量
溶胀度
high water retaining resins
absorbing capacity
imbibition
