A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Preparation method of salt-resistant hyperbranched polycarboxylate superplasticizer
The invention discloses a preparation method of a salt-tolerant hyperbranched polycarboxylate superplasticizer, which comprises the following steps: carrying out substitution reaction on polyhydric alcohol and unsaturated chloride to obtain a polymerizable active core, carrying out copolymerization reaction on the active core, carboxylic acid small monomers and sodium p-styrenesulfonate to obtain a hyperbranched active end, and carrying out polymerization reaction on the hyperbranched active end to obtain the salt-tolerant hyperbranched polycarboxylate superplasticizer. And carrying out atom transfer radical polymerization (ATRP) reaction with carboxylic acid small monomers under an initiation system consisting of halogen-containing unsaturated monomers and transition metal complexes to obtain the salt-tolerant hyperbranched polycarboxylic acid water reducing agent. Compared with a traditional comb-shaped polycarboxylic acid water reducer, the synthesized salt-resistant hyperbranched polycarboxylic acid water reducer has the advantages that the cement paste fluidity and retaining capacity are more excellent, the excellent cement paste dispersity is still kept under the condition of high-concentration salt, the technology is simple, the process is controllable, energy is saved, environment friendliness is achieved, and the method is suitable for industrial production. Good application potential and development prospects are realized.
本发明公开了耐盐型超支化聚羧酸减水剂的制备方法，该耐盐型超支化聚羧酸减水剂先采用多元醇与不饱和氯代物进行取代反应，得到可聚合活性核，然后活性核与羧酸类小单体、苯乙烯磺酸钠进行共聚合反应制得超支化活性端，再在含卤素不饱和单体和过渡金属配合物组成的引发体系下与羧酸类小单体发生原子转移自由基聚合（ATRP）反应得到耐盐型超支化聚羧酸减水剂。本发明所合成的耐盐型超支化聚羧酸减水剂比均具有比传统梳形聚羧酸减水剂更加优异的水泥净浆流动性及保持能力，且在高浓度盐条件下仍然保持优异的水泥浆分散性的优点，工艺简单、过程可控、节能环保，具有较好的应用潜力及发展前景。
Preparation method of salt-resistant hyperbranched polycarboxylate superplasticizer
The invention discloses a preparation method of a salt-tolerant hyperbranched polycarboxylate superplasticizer, which comprises the following steps: carrying out substitution reaction on polyhydric alcohol and unsaturated chloride to obtain a polymerizable active core, carrying out copolymerization reaction on the active core, carboxylic acid small monomers and sodium p-styrenesulfonate to obtain a hyperbranched active end, and carrying out polymerization reaction on the hyperbranched active end to obtain the salt-tolerant hyperbranched polycarboxylate superplasticizer. And carrying out atom transfer radical polymerization (ATRP) reaction with carboxylic acid small monomers under an initiation system consisting of halogen-containing unsaturated monomers and transition metal complexes to obtain the salt-tolerant hyperbranched polycarboxylic acid water reducing agent. Compared with a traditional comb-shaped polycarboxylic acid water reducer, the synthesized salt-resistant hyperbranched polycarboxylic acid water reducer has the advantages that the cement paste fluidity and retaining capacity are more excellent, the excellent cement paste dispersity is still kept under the condition of high-concentration salt, the technology is simple, the process is controllable, energy is saved, environment friendliness is achieved, and the method is suitable for industrial production. Good application potential and development prospects are realized.
本发明公开了耐盐型超支化聚羧酸减水剂的制备方法，该耐盐型超支化聚羧酸减水剂先采用多元醇与不饱和氯代物进行取代反应，得到可聚合活性核，然后活性核与羧酸类小单体、苯乙烯磺酸钠进行共聚合反应制得超支化活性端，再在含卤素不饱和单体和过渡金属配合物组成的引发体系下与羧酸类小单体发生原子转移自由基聚合（ATRP）反应得到耐盐型超支化聚羧酸减水剂。本发明所合成的耐盐型超支化聚羧酸减水剂比均具有比传统梳形聚羧酸减水剂更加优异的水泥净浆流动性及保持能力，且在高浓度盐条件下仍然保持优异的水泥浆分散性的优点，工艺简单、过程可控、节能环保，具有较好的应用潜力及发展前景。
Preparation method of salt-resistant hyperbranched polycarboxylate superplasticizer
耐盐型超支化聚羧酸减水剂的制备方法
GUAN JIANAN (author) / LIU SHAOJING (author) / XU YUNBO (author) / CHENG BO (author) / HUANG KENING (author) / HUANG MIN (author) / CHEN QINGFENG (author) / ZHANG GENGSEN (author)
2024-10-29
Patent
Electronic Resource
Chinese
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