Water-retaining polycarboxylic acid type water reducer containing beta-cyclodextrin, preparation method thereof and usage method thereof

A polycarboxylic acid-based and cyclodextrin technology, applied in the field of building materials, can solve the problems of water retention and stability of concrete, poor cement adaptability, poor mutual solubility of water-reducing agents, etc., and achieves good slump retention, Excellent water retention, low price effect

Active Publication Date: 2011-11-02
河北红墙新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polycarboxylate-based water-reducing agents also have fatal weaknesses, especially poor adaptability to cement. After mixing, concrete is prone to bleeding and segregation, which brings a lot of trouble to the project, and sometimes even causes huge engineering accidents, resulting in demolition. Problems such as recasting and reinforcement affect the pace of its large-scale promotion
[0005] In order to solve the problem of water retention and stability of concrete mixed with polycarboxylate-based water reducers, concrete admixture companies often compound cellulose ether, polyacrylamide, polyvinyl alcohol and dextrin in polycarboxylate-based water-reducers. Additives, but it is often found that these thickening aids have poor miscibility with polycarboxylate water reducers. Even though they may have been dissolved together at that time, after several days of storage, the thickeners precipitated and agglomerated, and even in high temperature days. Will go moldy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052]A water-retaining polycarboxylate superplasticizer containing β-cyclodextrin, the weight ratio of raw materials is allyl polyethylene glycol 100, acrylic acid 20, sodium methacrylate sulfonate 3, β-cyclodextrin 5, Maleic anhydride 2, dimethylformamide 2, sodium hydroxide 2, ammonium persulfate 0.5, azobisisobutylamidine hydrochloride 5. The synthesis process is as follows: Accurately weigh each raw material, add dimethylformamide and β-cyclodextrin into the reaction kettle, stir and dissolve, then add maleic anhydride, stir continuously and raise the temperature to 100°C, react for 4 hours, Obtain the maleic anhydride-β-cyclodextrin solution and set it aside; add an appropriate amount of ionized water, allyl polyethylene glycol, and sodium methacryl sulfonate to another reaction kettle, dissolve, stir evenly, and pour into the reaction kettle Introduce protective gas nitrogen, insert a condenser; at a temperature of 60 ° C, add dropwise acrylic acid, maleic anhydride-β-c...

Embodiment 2

[0054] A water-retaining polycarboxylate superplasticizer containing β-cyclodextrin, the weight ratio of raw materials is allyl polyethylene glycol 100, acrylic acid 60, sodium methacrylate sulfonate 30, β-cyclodextrin 30, Maleic anhydride 60, dimethylformamide 20, sodium hydroxide 20, ammonium persulfate 20, azobisisobutylamidine hydrochloride 0.5. The synthesis process is as follows: Accurately weigh each raw material, add dimethylformamide and β-cyclodextrin into the reaction kettle, stir and dissolve, then add maleic anhydride, stir continuously and raise the temperature to 70°C, react for 14 hours, Obtain the maleic anhydride-β-cyclodextrin solution, set aside; Add appropriate amount of ionized water, allyl polyethylene glycol, and sodium methacryl sulfonate to another reaction kettle, dissolve, stir evenly, and pass through the reaction kettle Inject protective gas nitrogen, insert a condenser; at a temperature of 100°C, add dropwise acrylic acid, maleic anhydride-β-cycl...

Embodiment 3

[0056] A water-retaining polycarboxylate superplasticizer containing β-cyclodextrin, the weight ratio of raw materials is allyl polyethylene glycol 100, acrylic acid 40, sodium methacrylate sulfonate 20, β-cyclodextrin 20, Maleic anhydride 30, dimethylformamide 9, sodium hydroxide 30, ammonium persulfate 10, azobisisobutylamidine hydrochloride 3. The synthesis process is as follows: Accurately weigh each raw material, add dimethylformamide and β-cyclodextrin into the reaction kettle, stir and dissolve, then add maleic anhydride, stir continuously and raise the temperature to 80°C, react for 10 hours, Obtain the maleic anhydride-β-cyclodextrin solution, set aside; Add appropriate amount of ionized water, allyl polyethylene glycol, and sodium methacryl sulfonate to another reaction kettle, dissolve, stir evenly, and pass through the reaction kettle Into the protective gas nitrogen, insert a condenser; at a temperature of 80 ° C, add dropwise acrylic acid, maleic anhydride-β-cycl...

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Abstract

The invention discloses a water-retaining polycarboxylic acid type water reducer containing beta-cyclodextrin, a preparation method thereof and a usage method thereof. The water-retaining polycarboxylic acid type water reducer containing beta-cyclodextrin is prepared through a method of free-radical polymerization in an aqueous solution with treating allyl polyethylene glycol, acrylic acid, sodium methyl allyl sulfonate, beta-cyclodextrin, maleic anhydride, dimethyl formamide, sodium hydroxide, ammonium persulfate and azobis (isobutylamidine hydrochloride) as raw materials. The polycarboxylic acid type water reducer, which allows water reducing rate to be high, enhancement effect to be good and water retention and cohesiveness of concrete to be greatly improved, has large technical advantages in high fluidity concrete, self-compacting concrete, grouting materials and lean concrete, so the reducer provided by the invention has a broad market prospect.

Description

[0001] technical field [0002] The invention belongs to the technical field of building materials, and in particular relates to a water-retaining polycarboxylate water reducer containing β-cyclodextrin and its preparation and use method. [0003] Background technique [0004] Adding an appropriate amount of water reducing agent to concrete can significantly improve the work performance of fresh concrete and the comprehensive performance of hardened concrete. As the third-generation water-reducing agent, polycarboxylate-based water-reducing agent has the advantages of low dosage, high water-reducing rate, little effect on setting time, good concrete slump retention, environmental protection and no pollution, and has great development potential. Advantage. However, polycarboxylate-based water-reducing agents also have fatal weaknesses, especially poor adaptability to cement. After mixing, concrete is prone to bleeding and segregation, which brings a lot of trouble to the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B103/30
CPCC04B24/383
Inventor 赵利华黄海燕翟冲
Owner 河北红墙新材料有限公司
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