接枝共聚-磺化反应改性对木质素磺酸盐减水剂使用效果的影响  

Effects of Graft Copolymerization and Sulfonation Reaction Modification on Using Effets of Lignosulfonate Water Reducing Agent

作　　者：刘镇[1] 

机构地区：[1]大连职业技术学院,辽宁大连116035

出　　处：《表面技术》2016年第12期135-139,共5页Surface Technology

摘　　要：目的木质素磺酸盐是一种阴离子型高分子表面活性剂,可以作为混凝土减水剂,但是效果一般。尝试使用接枝共聚-磺化反应,对木质素磺酸盐减水剂进行改性,改善其使用效果。方法同时进行两种改性反应,从混凝土的减水率、凝结时间和抗压强度三个方面,研究了接枝共聚反应和磺化反应顺序及接枝单体和磺化剂用量,对木质素磺酸盐减水剂实际使用效果的影响。结果确定了反应的次序,得到了丙烯酸和亚硫酸钠的最佳用量分别为木质素磺酸盐用量的10%和30%,混凝土各项性能得到了改善。掺加未改性木质素磺酸盐的混凝土,抗压强度明显减小;而掺加改性木质素磺酸盐的混凝土,抗压强度均有一定的增大。结论接枝共聚-磺化反应改性对木质素磺酸盐减水剂的使用效果具有增强作用,可显著提高混凝土的各项性能。Lignosulfonate is an anionic polymer surfactant and can be used as concrete water reducing agent, but it makes common effects only. The work aims to improve using effects of lignosulfonate water reducing agent by modifying it by taking advantage of graft copolymerization-sulfonation reaction. Effets of graft copolymerization, sulfonation reaction order as well as the dosage of graft monomer and suffocating agent on actual using effects of lignosulfonate water reducing agent were studied in the aspects of water-reducing rate, setting time and compressive strength by performing two modification reactions simultaneously. The reaction order was determined, optimal dosage of crylic acid and sodium sulfite as 10% and 30% of lignosulfonate dosage repectively was obtained. All properties of the concrete were improved. For concrete mixed with unmodified lignosulfonate, the compressive strength reduced significantly. For concrete mixed with modified lignosulfonate, the compressive strength increased to a certain extent. Graft copolymerization and sulfonation reaction modification can enhance the using effects of lig-nosulfonate water reducing agent and improve various properties of concrete significantly.

关 键 词：木质素磺酸盐 接枝共聚 磺化 减水剂 混凝土 抗压强度 

分 类 号：TG17[金属学及工艺—金属表面处理]