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Mud-resistant polycarboxylate superplasticizer and preparation method thereof
The invention discloses a mud-resistant polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the following steps: carrying out a reaction on an unsaturated small monomer A, ammonium butyrate and cucurbituril to prepare a cucurbituril macromonomer, and carrying out a free radical polymerization reaction on an unsaturated small monomer B, an unsaturated macromonomer and the cucurbituril macromonomer to obtain the mud-resistant polycarboxylate superplasticizer. to prepare the polycarboxylic acid water reducer with cucurbituril as a grafting side chain in the molecular structure. The molecular structure of the obtained polymerization product contains a cucurbituril structure which is hydrophobic inside and hydrophilic outside and has a large physical size, cucurbituril is introduced on the basis of an original comb structure, and compared with a conventional polycarboxylate superplasticizer, the steric hindrance of the superplasticizer can be increased, the situation that a side chain of a polyether macromonomer is inserted between montmorillonite layers due to the hydrogen-bond interaction can be slowed down, and the adsorption effect of the polycarboxylate superplasticizer on montmorillonite is reduced, so that the invalid consumption of the superplasticizer is reduced. The problem of clay tolerance of the existing polycarboxylic acid water reducing agent is solved, the use dosage of the water reducing agent is reduced, and the effectiveness of the water reducing agent is greatly improved.
本发明公开了一种抗泥型聚羧酸减水剂及其制备方法，包括：将不饱和小单体A、丁铵和瓜环进行反应制备得到瓜环大单体，将不饱和小单体B、不饱和大单体和瓜环大单体进行自由基聚合反应，制备分子结构中以瓜环作为接枝侧链的聚羧酸减水剂。得到的聚合产物分子结构中含有内疏水外亲水的物理尺寸大的瓜环结构，原有的梳性结构的基础上引入瓜环，对比常规的聚羧酸减水剂，可以增大减水剂的空间位阻及减缓聚醚大单体的侧链由于氢键作用插入到蒙脱土层间，减少聚羧酸减水剂对蒙脱土的吸附作用，从而减少减水剂的无效消耗。解决了目前聚羧酸减水剂在粘土耐受性方面的难题，减少了减水剂的使用剂量，大大提高了减水剂的有效性。
Mud-resistant polycarboxylate superplasticizer and preparation method thereof
The invention discloses a mud-resistant polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the following steps: carrying out a reaction on an unsaturated small monomer A, ammonium butyrate and cucurbituril to prepare a cucurbituril macromonomer, and carrying out a free radical polymerization reaction on an unsaturated small monomer B, an unsaturated macromonomer and the cucurbituril macromonomer to obtain the mud-resistant polycarboxylate superplasticizer. to prepare the polycarboxylic acid water reducer with cucurbituril as a grafting side chain in the molecular structure. The molecular structure of the obtained polymerization product contains a cucurbituril structure which is hydrophobic inside and hydrophilic outside and has a large physical size, cucurbituril is introduced on the basis of an original comb structure, and compared with a conventional polycarboxylate superplasticizer, the steric hindrance of the superplasticizer can be increased, the situation that a side chain of a polyether macromonomer is inserted between montmorillonite layers due to the hydrogen-bond interaction can be slowed down, and the adsorption effect of the polycarboxylate superplasticizer on montmorillonite is reduced, so that the invalid consumption of the superplasticizer is reduced. The problem of clay tolerance of the existing polycarboxylic acid water reducing agent is solved, the use dosage of the water reducing agent is reduced, and the effectiveness of the water reducing agent is greatly improved.
本发明公开了一种抗泥型聚羧酸减水剂及其制备方法，包括：将不饱和小单体A、丁铵和瓜环进行反应制备得到瓜环大单体，将不饱和小单体B、不饱和大单体和瓜环大单体进行自由基聚合反应，制备分子结构中以瓜环作为接枝侧链的聚羧酸减水剂。得到的聚合产物分子结构中含有内疏水外亲水的物理尺寸大的瓜环结构，原有的梳性结构的基础上引入瓜环，对比常规的聚羧酸减水剂，可以增大减水剂的空间位阻及减缓聚醚大单体的侧链由于氢键作用插入到蒙脱土层间，减少聚羧酸减水剂对蒙脱土的吸附作用，从而减少减水剂的无效消耗。解决了目前聚羧酸减水剂在粘土耐受性方面的难题，减少了减水剂的使用剂量，大大提高了减水剂的有效性。
Mud-resistant polycarboxylate superplasticizer and preparation method thereof
一种抗泥型聚羧酸减水剂及其制备方法
QU HAOJIE (author) / QIAN SHANSHAN (author) / PENG JINYING (author) / ZHAO XU (author) / WANG XUECHUAN (author) / ZHENG CHUNYANG (author)
2021-06-01
Patent
Electronic Resource
Chinese
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