聚丙烯纤维/脱硫石膏复合材料性能研究及机理探讨

Properties and mechanism research on polypropylene fiber desulfurization gypsum composite material

通过掺加聚丙烯纤维增强脱硫石膏的力学性能,制备出一种聚丙烯纤维/脱硫石膏复合材料,并掺加一定量硬脂酸-聚乙烯醇乳液改善复合材料的耐水性能。实验考察了聚丙烯纤维和硬脂酸-聚乙烯醇乳液对材料抗折、抗压强度,吸水率和软化系数的影响。利用扫描电子显微镜对试样的断面进行微观分析,并构建了物理模型对有机乳液的防水机理进行了探讨。实验结果表明:与空白试样相比,单掺6%聚丙烯纤维可使石膏试样的抗折、抗压强度分别提高47.83%、27.88%,但其耐水性能有一定程度地削弱;而掺加硬脂酸-聚乙烯醇乳液可弥补聚丙烯纤维造成的强度损失,当硬脂酸-聚乙烯醇乳液加入量为3%时,石膏试样浸水2h、24h的吸水率分别降低90.30%、85.62%;同时掺加聚丙烯纤维和硬脂酸-聚乙烯醇乳液制备的复合材料试样力学性能和耐水性能均得到明显改善。

A polypropylene fiber desulfurization gypsum composite material is prepared by adding polypropylene fiber to reinforce mechanical properties, and a certain quantity of stearic acid and polyvinyl alcohol latex to improve water resistance. The effect of polypropylene fiber and stearic acid - polyving akohol emulsion on the flexural strength, the compressive strength, the water absorption and the softening coefficient of the composite materials are test.