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在可再分散乳胶粉乳液合成过程中引入一种防水效果好、耐碱性强、对环境没有污染的长链有机硅烷,提高了可再分散胶乳粉的耐水性。通过选择合适的乳化剂解决硅烷在水中的溶解性问题,并在该体系中加入一种具有长链结构的高分子稳定剂,一方面可以裹附在增溶胶束的周围,凭借其高分子质量所产生的空间位阻效应阻止增溶胶束的聚集;另一方面也增加了整个乳液体系的黏度,减小布朗运动发生的几率,从而达到稳定硅烷乳液的作用,将乳液进行喷雾干燥得到具有憎水性的可再分散乳胶粉。实验发现,通过憎水改性的胶粉应用在砂浆中比普通胶粉在耐水方面有很大的提高,在砂浆48 h吸水率实验中前者比后者降低了80%,并保持粘结性能稳定。
In the process of synthesizing redispersible emulsion powder, a long-chain organosilane with good water-proofing effect, strong alkali-resistance and no pollution to the environment was introduced to improve the water resistance of the redispersible latex powder. By selecting a suitable emulsifier to solve the problem of silane in water solubility, and in the system by adding a long chain structure of the polymer stabilizer, on the one hand can be wrapped around the solubilized micelles, by virtue of its high molecular weight The resulting steric hindrance effect prevents the aggregation of the solubilized micelles; on the other hand, it also increases the viscosity of the whole emulsion system and reduces the chances of Brownian motion, so as to achieve the function of stabilizing the silane emulsion. The emulsion is spray-dried to obtain a hated Water-based dispersible polymer powder. The experimental results show that the hydrophobically modified rubber powder used in mortar has a great improvement in water resistance compared with ordinary rubber powder. In the 48 h water absorption rate experiment, the former is 80% lower than the latter and maintains the bonding performance stable.