聚合物乳液在水泥颗粒表面吸附的影响因素--乳液类型及聚灰比

Factors Influencing the Adsorption Behavior of Latex Polymer on Cement:Latex Type and Polymer/Cement Ratio

为了研究影响聚合物颗粒在水泥表面吸附行为的因素,测试了掺乳液前后新拌浆体zeta电位随时间的变化,并研究了乳液类型及聚灰比(mL/mC)对水泥粒子吸附乳液中聚合物颗粒(简称乳液颗粒)的影响.结果表明:水泥粒子会吸附乳液颗粒,阴离子型乳液颗粒较非离子型乳液颗粒更易被水泥粒子吸附;随聚灰比的增加,水泥粒子对乳液颗粒的吸附量有一个最大值,且乳液颗粒在水泥表面的吸附是单层的.

In order to investigate the factors influencing the adsorption behavior of polymer particles on ce- ment grains, the zeta potentials of fresh plain cement paste（PCP） and latex modified cement pastes（LM- CP） were measured and the influences of latex type and the latex to cement ratio （mL/mc） on the adsorp- tion behavior of polymer particles in the latex （for short as latex particles） on the cement grain were inves- tigated. The results show that cement grains can adsorb latex particles, moreover, anionic latex particles are more easily adsorbed by cement grains than nonionic ones. With the increase of rnL/mc the adsorbed la- tex particles on the cement grains increase to a constant level, therefore it can be concluded that the ad- sorption is single-layered.