不同温度和冷冻/冻融循环对保水剂吸持水性能的影响

    Effect of different temperatures and freezing/freezing-thawing cycles on the water absorption and holding properties of superabsorbent polymers

    • 摘要: 作为一种土壤改良材料,保水剂能够有效提高土壤的保水能力,改善干旱和恶劣环境下的植物生长环境,已广泛应用于农业和生态恢复领域。该研究聚焦于不同温度和冷冻条件下保水剂的吸持水性能变化,探究不同温度、冷冻方法、成分、粒径对保水剂吸持水性能的影响,通过单因素、多因素方差分析和熵权TOPSIS法,对10种保水剂的吸持水性能进行分析和研究。结果表明:1)这10种保水剂在吸水倍率方面呈现出极大的差异,为167.99~527.5 g/g,这与保水剂的主要成分密切相关,主要成分为高分子聚合物的保水剂吸水倍率较高,保水剂的主要成分对其保水性能也有显著的影响,多数复合型的保水剂在保水性能上较优;2)保水剂的吸水速率受粒径的影响较大,呈现出随粒径的增大而下降的趋势,低温会限制保水剂的吸水速率,同时,显著影响保水剂的保水性能,保水率随环境温度的上升,呈现增加趋势;3)多因素方差分析表明,保水剂的粒径对反复吸水倍率的衰减率和冷冻/冻融后的吸水倍率具有极显著影响(P < 0.001),而冷冻/冻融过程同样会显著影响保水剂的吸水倍率和保水率(P < 0.001)。4)通过熵权TOPSIS法分析可知,不同保水剂,在吸水、保水和耐寒性能上表现不一,以聚丙烯酸钾为主要成分的保水剂,其综合性能排序相对靠前。研究可为保水剂的应用和新型保水剂的开发提供理论依据和参考。

       

      Abstract: Superabsorbent polymers (SAP) significantly improved the soil's water retention properties, enhancing plant growth conditions in drought and harsh environments. They were widely used in agricultural production, especially in areas with scarce water resources, as well as in ecological restoration projects to rehabilitate degraded land and improve vegetation growth. They had become one of the key materials in soil improvement and environmental restoration. This study focuses on the changes of water absorption and water retention properties of superabsorbent polymers under different temperatures and freezing conditions, and investigates the effects of different temperatures, freezing methods, compositions, and particle sizes on the water absorption and water retention properties of SAP. The water absorption and water retention properties of 10 SAP were analysed and investigated by one-way and multi-factor ANOVA and technique for order preference by similarity to ideal solution. The results showed that these 10 superabsorbent polymers showed great differences in water absorption ratio, ranging from 167.99 to 527.5 g/g, which was closely related to the main composition of SAP, and the water absorption of SAP whose main composition was polymer ratio is higher. The main composition of superabsorbent polymers also has a significant effect on its water retention performance, and most of the polymer superabsorbent polymers are superior in water retention properties. The water absorption rate of superabsorbent polymers was greatly affected by the particle size, showing a decreasing trend with the increase of particle size, and the low temperature would limit the water absorption rate of SAP, and at the same time, significantly affect the water retention performance of SAP. The water retention rate of superabsorbent polymers showed an increasing trend with the increase of ambient temperature. Multifactorial ANOVA showed that the particle size of superabsorbent polymers had a highly significant effect on the attenuation rate of the repeated water absorption multiplicity and the water absorption ratio after freezing and freezing and thawing (P < 0.001), while the freezing and freezing and thawing processes likewise significantly affected the water absorption ratio and the water retention ratio of SAP (P < 0.001). and water retention rate (P < 0.001). The technique for order preference by similarity to ideal solution analysis shows that different superabsorbent polymers, in terms of water absorption, water retention and cold resistance performance varies, and SAP with potassium polyacrylate as the main component has a relatively high comprehensive performance order. The comprehensive performance of SAP, with potassium polyacrylate as the main component, was ranked relatively high. This study can provide theoretical basis and reference for the application of superabsorbent polymers and the development of new SAP in cold regions.

       

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