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A kind of preparation method of strong adaptability polycarboxylate water reducing agent

An adaptable, polycarboxylic acid technology, applied in the field of concrete admixtures, can solve problems such as insufficient water reducing effect, poor adaptability, low dosage of water reducing rate slump, etc., to achieve small slump loss and low production cost , the effect of high water reduction rate

Active Publication Date: 2018-06-26
JIANGSU SOBUTE NEW MATERIALS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to overcome the problems of poor adaptability between existing polycarboxylate water-reducers and cement and insufficient water-reducing effect, and provides a preparation method of highly adaptable polycarboxylate high-performance water-reducers. Low, high water reducing rate, small slump loss, strong adaptability, etc., and the preparation process is simple

Method used

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  • A kind of preparation method of strong adaptability polycarboxylate water reducing agent
  • A kind of preparation method of strong adaptability polycarboxylate water reducing agent
  • A kind of preparation method of strong adaptability polycarboxylate water reducing agent

Examples

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Effect test

Embodiment 1

[0041] 15.6g polyethylene glycol monomethyl ether methacrylate (Mn=500g / mol), 0.27g 4-cyano-4-(phenylthioformylthio)valeric acid and 0.03g azodiiso After butylamidine hydrochloride and 36.4g water are fully mixed, pass into N 2 O in the solution 2 discharge, the N 2 The reversible addition-fragmentation chain transfer polymerization reaction is carried out under protection, the reaction temperature is 60°C, the reaction time is 8h, the conversion rate of monomer a is 97.07%, and the unreacted monomer and small molecules are removed by dialysis to obtain the polyether Macromonomer-RAFT reagent (Mw=9.87kDa), add 6.43g acrylic acid (41.16% conversion rate), 2.49g N-vinylpyrrolidone (38.43% conversion rate) and continue to polymerize for 12h to obtain highly adaptable polycarboxylic acid water reducing Agent stock solution (Mw=10.43kDa).

Embodiment 2

[0043] 29.64g polyethylene glycol monomethyl ether acrylate (Mn=950g / mol), 0.09g 2-(phenylthioformylthio) propionic acid and 0.01g azobisisobutylamidine hydrochloride and After 55g of water is fully mixed, N 2 O in the solution 2 discharge, the N 2 The reversible addition-fragmentation chain transfer polymerization reaction is carried out under protection, the reaction temperature is 80 ° C, the reaction time is 5 h, the conversion rate of monomer a is 97.34%, and the unreacted monomer and small molecules are removed by dialysis to obtain polyether macromolecules. Monomer-RAFT reagent (Mw=43.09kDa), add 59.67g acrylic acid (47.84% conversion), 48.12g hydroxyethyl acrylate (47.00% conversion), 18.34g 4-vinylbenzoic acid (46.12% conversion) The polymerization was continued for 5 hours to obtain a strong adaptability polycarboxylate superplasticizer mother solution (Mw=69.87kDa).

Embodiment 3

[0045] 29.64g polyethylene glycol monomethyl ether methacrylate (Mn=950g / mol), 0.34g 4-cyano-4-(phenylthioformylthio)pentanoic acid and 0.03g 4,4' -After azobis(4-cyanovaleric acid) and 55g water are fully mixed, pass into N 2 O in the solution 2 discharge, the N 2 The reversible addition-fragmentation chain transfer polymerization reaction was carried out under protection, the reaction temperature was 70°C, the reaction time was 8 hours, the conversion rate of monomer a was 97.62%, and the unreacted monomer and small molecules were removed by dialysis to obtain polyether macromolecules. Monomer-RAFT reagent (Mw=15.05kDa), add 11.17g methacrylic acid (49.65% conversion rate), 0.71g 2-vinylpyridine (45.04% conversion rate) and continue to polymerize for 5h to obtain strong adaptability polycarboxylic acid Aqueous mother liquor (Mw=17.36kDa).

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Abstract

The invention relates to a high-adaptability polycarboxylate water-reducing agent. The high-adaptability polycarboxylate water-reducing agent has the advantages that the high-adaptability polycarboxylate water-reducing agent is low in dosage and slump loss and high in water-reducing rate and adaptability; functional groups with rigid structures are introduced in block polycarboxylate main chain structures, so that the conformation of polycarboxylate in solution can be adjusted, adsorption behavior of the polycarboxylate can be changed, and the high-adaptability polycarboxylate water-reducing agent is high in adaptability; a method for synthesizing the high-adaptability polycarboxylate water-reducing agent is simple, has low technological requirements and is low in production cost.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a preparation method of a highly adaptable polycarboxylate water reducer that can be used as a concrete water reducer. Background technique [0002] Concrete is the largest and most widely used building material in the world. With the continuous development of science and technology, people's requirements for the function and quality of building structures have gradually increased. Therefore, concrete admixtures have emerged as the times require. Concrete admixture is a material added before or during concrete mixing to improve the performance of freshly mixed (or) hardened concrete. The wide application of various concrete admixtures has made it an indispensable fifth component in concrete besides cement, sand, stone and water. The research and application of admixtures have promoted the development of new varieties of concrete and concrete cons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C04B24/26C04B103/30
Inventor 刘加平王秀梅冉千平翟树英曹攀攀张志勇
Owner JIANGSU SOBUTE NEW MATERIALS