聚合物乳液对发泡水泥板的改性研究

分别利用石蜡乳液、硅丙乳液和苯丙乳液,通过浸泡吸附和减压吸附两种不同吸附方式,对发泡水泥板进行了改性研究。研究发现:减压吸附比浸泡吸附的吸附效果更好,并且发泡水泥板乳液吸附率与聚合物乳液中的固体物质量分数正相关。所得实验结果表明,3种聚合物乳液中,石蜡乳液对发泡水泥板的体积吸水率影响较大,经吸附率为2.4%的石蜡乳液改性发泡水泥板的体积吸水率为8.9%,约降低了40.6%。发泡水泥板吸附硅丙乳液或苯丙乳液有利于抗压强度的提高,经硅丙乳液吸附改性后,发泡水泥板的抗压强度上升至0.624 MPa,约提高了51.4%;而经苯丙乳液吸附改性后水泥板的抗压强度上升至0.527 MPa,约提高了27.9%。

Effects of Emulsion Modification on Properties of Foamed Cement Boards

Paraffin emulsion, silicone emulsion and styrene-acrylic emulsion have been used respectively to modify the foamed cement boards by two different ways, namely, immersion adsorption and vacuum adsorption. The results show that the adsorption effect of pressure reduction adsorption is better than that of immersion adsorption, with the adsorption rate of foam cement boards positively related to the mass fraction of solid substance in polymer emulsion. In addition, for the three kinds of emulsion, the paraffin emulsion has a great influence on the volume absorption rate of the foamed cement boards. The volume water absorption of paraffin modified foam cement plates is 8.9%, about 40.6% lower than that of 2.4%. The adsorption of silicone acrylic emulsion or styrene acrylic emulsion on foamed cement boards helps to improve the compressive strength. The compressive strength of the foamed cement boards increases to 0.624 MPa after the modification of the silicone acrylic emulsion, an increase by approximately 51.4%; while after the modification of styrene acrylic emulsion, the compressive strength of the cement boards increases to 0.527 MPa, an increase by approximately 27.9%.