改性聚乙烯醇协同硅酸盐水泥制高强防水石膏  

Preparation of High Strength Waterproof Gypsum by Modified Polyvinyl Alcohol and Portland Cement

作　　者：徐海祥 夏举佩 XU Hai-Xiang;XIA Ju-Pei(School of Public Safety and Emergency Management,Kunming University of Science and Technology,Kunming 650500,China;Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Hubei Jianghan Construction Machinery Co.,Ltd.,Jingzhou 434000,China)

机构地区：[1]昆明理工大学公共安全与应急管理学院,昆明650500 [2]昆明理工大学化学工程学院,昆明650500 [3]湖北江汉建筑工程机械有限公司,荆州434000

出　　处：《应用化学》2024年第8期1131-1145,共15页Chinese Journal of Applied Chemistry

摘　　要：以脱硫石膏为基料,以液碱活化聚甲基氢硅氧烷(PMHS)催化改性聚乙烯醇(PVA)防水剂协同硅酸盐水泥研发高强防水石膏。探究了改性PVA防水剂、硅酸盐水泥对脱硫石膏标准试块表面吸水率、力学性能和软化系数的影响;通过红外光谱确定改性疏水剂、硅酸盐水泥单独及协同研发强防水石膏的连接形式;通过热重仪分析不同掺加剂对石膏热稳定性的影响;研究表明,改性PVA防水剂协同硅酸盐水泥制高强防水石膏的最佳配比为:防水剂120 g、硅酸盐水泥150 g,此时表面吸水率9.35%,绝干抗压强度22.54 MPa、软化系数67.57%,同时有效提高了纸面石膏板的热稳定性。Based on desulfurized gypsum,the waterproof agent developed by modifying polyvinyl alcohol(PVA)catalyzed by liquid alkali activated Polymethyl hydrogen siloxane(PMHS)cooperated with portland cement to develop high-strength waterproof gypsum.The effects of modified PVA waterproofing agent and portland cement on the surface water absorption,mechanical properties and softening coefficient of desulfurization gypsum standard test block were investigated.The connection form of strong waterproof gypsum developed by modified hydrophobic agent and portland cement independently and cooperatively was determined by infrared spectrum.The influence of different additives on the thermal stability of gypsum was analyzed by thermogravimetry.The research shows that the best ratio of modified PVA waterproof agent and portland cement to produce high-strength waterproof gypsum is:waterproof agent 120 g and portland cement 150 g.At this time,the surface water absorption rate is 9.35%,the absolute dry compressive strength is 22.54 MPa,and the softening coefficient is 67.57%.At the same time,the thermal stability of gypsum board is effectively improved.

关 键 词：液碱活化甲基含氢硅油 催化改性 改性PVA疏水剂 热稳定性 高强防水石膏 

分 类 号：O647[理学—物理化学]