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The invention discloses a shrinkage-reducing polycarboxylate superplasticizer and a preparation method thereof, and belongs to the technical field of concrete admixtures. The shrinkage-reducing type polycarboxylate superplasticizer comprises a polymerization monomer with a shrinkage reducing function, unsaturated carboxylic acid alkyl ester, a sulfonic monomer, a polyether macromonomer, dispersing agent water, an initiator, a molecular weight regulator and distilled water, after the raw materials completely react under certain conditions, the raw materials are cooled to 20-30 DEG C, then alkali liquor is added to adjust the pH value, and the polycarboxylate superplasticizer with the shrinkage reducing function is obtained. According to the polycarboxylate superplasticizer with the shrinkage reducing function, the shrinkage reducing groups are grafted on molecular structure chains of the polycarboxylate superplasticizer, so that the polycarboxylate superplasticizer has a good shrinkage reducing effect while having water reducing, strength maintaining and slump retaining functions, shrinkage can be compensated to a certain extent, the crack generation time of concrete is shortened, the crack development width of the concrete is widened, and the concrete quality is improved. A new way is introduced for inhibiting self-shrinkage and dry shrinkage cracking of the concrete.
本发明公开了一种减缩型聚羧酸减水剂及其制备方法，属于混凝土外加剂技术领域。所述减缩型聚羧酸减水剂包括减缩功能聚合单体、不饱和羧酸烷基酯、磺酸基单体、聚醚大单体、分散剂水、引发剂、分子量调节剂、蒸馏水，待上述原料在一定条件下反应完全后，冷却至20℃~30℃，再加入碱液调节pH，即得具有减缩功能的聚羧酸减水剂。本发明中的减缩功能的聚羧酸减水剂，由于在聚羧酸减水剂分子结构链上接枝了减缩基团，从而在具备减水、保强度、保坍功能的同时具有良好的减缩效果，其能在一定程度上补偿收缩，延缓混凝土的裂缝产生的时间以及裂缝发展的宽度，为抑制混凝土自收缩和干缩收缩开裂引入了新的途径。
The invention discloses a shrinkage-reducing polycarboxylate superplasticizer and a preparation method thereof, and belongs to the technical field of concrete admixtures. The shrinkage-reducing type polycarboxylate superplasticizer comprises a polymerization monomer with a shrinkage reducing function, unsaturated carboxylic acid alkyl ester, a sulfonic monomer, a polyether macromonomer, dispersing agent water, an initiator, a molecular weight regulator and distilled water, after the raw materials completely react under certain conditions, the raw materials are cooled to 20-30 DEG C, then alkali liquor is added to adjust the pH value, and the polycarboxylate superplasticizer with the shrinkage reducing function is obtained. According to the polycarboxylate superplasticizer with the shrinkage reducing function, the shrinkage reducing groups are grafted on molecular structure chains of the polycarboxylate superplasticizer, so that the polycarboxylate superplasticizer has a good shrinkage reducing effect while having water reducing, strength maintaining and slump retaining functions, shrinkage can be compensated to a certain extent, the crack generation time of concrete is shortened, the crack development width of the concrete is widened, and the concrete quality is improved. A new way is introduced for inhibiting self-shrinkage and dry shrinkage cracking of the concrete.
本发明公开了一种减缩型聚羧酸减水剂及其制备方法，属于混凝土外加剂技术领域。所述减缩型聚羧酸减水剂包括减缩功能聚合单体、不饱和羧酸烷基酯、磺酸基单体、聚醚大单体、分散剂水、引发剂、分子量调节剂、蒸馏水，待上述原料在一定条件下反应完全后，冷却至20℃~30℃，再加入碱液调节pH，即得具有减缩功能的聚羧酸减水剂。本发明中的减缩功能的聚羧酸减水剂，由于在聚羧酸减水剂分子结构链上接枝了减缩基团，从而在具备减水、保强度、保坍功能的同时具有良好的减缩效果，其能在一定程度上补偿收缩，延缓混凝土的裂缝产生的时间以及裂缝发展的宽度，为抑制混凝土自收缩和干缩收缩开裂引入了新的途径。
Reduction type polycarboxylate superplasticizer and preparation method thereof
一种减缩型聚羧酸减水剂及其制备方法
XU FENG (author)
2022-06-28
Patent
Electronic Resource
Chinese
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