摘要
以聚氨酯为基体,与土壤复合,制备植物栽培基质,研究了聚醚多元醇、异氰酸酯、土壤、水和辛酸亚锡的含量及土壤粒径对基质结构和性能的影响.结果表明,随着土壤含量的增加,泡孔孔径分布越来越不均匀,吸水保水率和发泡倍数降低,当土壤含量为10份时,基质的吸水率达到最大,其值为690.6％;随着多元醇与异氰酸酯的比例逐渐增大,泡孔孔径逐渐减小且泡孔分布趋于均匀,吸水保水率逐渐增强,当多元醇与异氰酸酯的比例为13∶2时,基质的吸水率达到最大,其值为395.1％;随着水含量的增加,孔隙增多,孔径增大,吸水保水性增强,当水的含量为0.6份时,基质的吸水率达到最大,其值为423.9％;随着辛酸亚锡含量的增加,孔隙分布更加密集,吸水保水率缓慢增大,当辛酸亚锡含量为0.2份时,基质的吸水率达到最大,其值为355.2％.
Abstract
The structure and properties of plant culture matrix were prepared by polyurethane matrix,which was combined with soil.The effects of the relative amounts of polyether polyols,isocyanate,soil,water and stannous caprylate,as well as soil particle size,were studied.The results showed that with the increase of soil dosage,the distribution of pore diameter became more and more uneven,and the water absorption and retention ratio and foaming ratio decreased.The maximum water absorption rate was 690.6％when the soil dosage was 10 parts.As the proportion of polyol:isocyanate increased gradually,the pore size decreased gradually and the distribution of pore tended to be uniform,and the water absorption and retention rate increased gradually,with the maximum water absorption of 395.1％at 13∶2.With the increase of water,the pores increase,the pore size becomes larger,and the water absorption and retention are enhanced.The maximum water absorption rate was 423.9％when the amount of water was 0.6 parts.With the increase of stannous caprylate,the pore distribution became more dense,and the water absorption and retention rate increased slowly.When the dosage of stannous caprylate was 0.2,the water absorption rate was 355.2％at most.
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