Low air leading reducing type polycarboxylic acid concrete water reducer and preparation method thereof

A technology of concrete water reducer and polycarboxylate, which is applied in the field of polycarboxylate concrete water reducer, can solve the problems of polycarboxylate water reducer with high gas content, decreased defoaming ability, complex synthesis process, etc., and achieve plasticity retention Good, high fluidity, low air content and low surface tension

Active Publication Date: 2012-11-07
山东华伟银凯建材科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of these shrinkage reducing agents reduces the shrinkage of concrete to a certain extent, the engineering cost is greatly increased, and the synthesis process is complicated
[0004] For the problem of high gas content of polycarboxylate superplasticizer, it is mainly solved by adding a certain amount of defoamer such as siloxane polymer. Although defoamer can significantly reduce the gas content of polycarboxylate superplasticizer, but There is a problem of difficult compatibility. As the storage time prolongs, the defoamer compounded in the polycarboxylate water reducer will precipitate in the form of oil droplets. Although there is no compatibility problem with the foam group, it is expensive and its defoaming ability is reduced compared with compounding

Method used

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  • Low air leading reducing type polycarboxylic acid concrete water reducer and preparation method thereof
  • Low air leading reducing type polycarboxylic acid concrete water reducer and preparation method thereof
  • Low air leading reducing type polycarboxylic acid concrete water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 0.085 mol of modified polyether TPEG with an average molecular weight of 2400 (205 parts by mass), 87 parts of water in a four-necked bottle, start stirring, heat up to 50°C, add 0.93 parts of H 2 o 2 Mixed solution with 12 parts of water, stirred and reacted for 10min, began to drop ascorbic acid, chain transfer agent mixed aqueous solution and acrylic acid solution, wherein, the composition of ascorbic acid and chain transfer agent mixed aqueous solution was: 0.35 parts of ascorbic acid, 0.45 parts of thioglycolic acid and 65 parts of water, the dropping time is 2.5h; acrylic acid 0.28mol (20 parts), the dropping time is 2.0h. After the dropwise addition, continue the heat preservation reaction at 50°C for 1.0h, then add 167 parts of water, cool down to 30°C, and add 47% sodium hydroxide solution to adjust the pH value to 7.0.

Embodiment 2

[0032] Weigh 0.085 mol of modified polyether TPEG with an average molecular weight of 2400 (205 parts by mass), 87 parts of water in a four-necked bottle, start stirring, heat up to 55°C, add 0.80 parts of H 2 o 2 Mixed solution with 12 parts of water, stirred and reacted for 10 minutes, began to drop ascorbic acid, chain transfer agent mixed aqueous solution and methacrylic acid, wherein: the composition of ascorbic acid and chain transfer agent mixed aqueous solution was: 0.35 parts of ascorbic acid, 0.40 parts of mercaptopropane Acid and 65 parts of water, the dropping time is 2.5h; methacrylic acid 0.297mol (25.6 parts), the dropping time is 2.0h. After the dropwise addition, continue the heat preservation reaction at 55°C for 1.0h, then add 177 parts of water, cool down to 30°C, and add 47% sodium hydroxide solution to adjust the pH value to 6.5.

Embodiment 3

[0034] Weigh 0.085 mol of modified polyether TPEG with an average molecular weight of 2400 (205 parts by mass), 110 parts of water in a four-necked bottle, start stirring, heat up to 52°C, add 0.79 parts of H 2 o 2 Mixed solution with 12 parts of water, stirred and reacted for 10 minutes, began to drop ascorbic acid, chain transfer agent mixed aqueous solution and monomer B solution, wherein: the composition of ascorbic acid, chain transfer agent mixed aqueous solution: 0.23 parts of ascorbic acid, 0.41 parts of mercapto Acetic acid and 65 parts of water, the dropping time is 3.0h; the composition of monomer B solution is: 0.24mol (17 parts) of acrylic acid and 0.04mol of acrylamide (5.7 parts of acrylamide solution with a mass fraction of 50%), drop Adding time is 2.5h. After the dropwise addition, continue the heat preservation reaction at 52°C for 1.0h, then add 145 parts of water, cool down to 25°C, and add 47% sodium hydroxide solution to adjust the pH value to 7.5.

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Abstract

The invention relates to a low air leading reducing type polycarboxylic acid concrete water reducer and a preparation method thereof. The water reducer is formed by a single body A and a single body B in copolymerization according to the molar ratio of 1:3-3.5. The single body A is modified polyether TPEG, and the single body B is one or several of crylic acid, methyl acrylate, acrylamide, methacrylic acid, methyl methacrylate and methacrylamide. The preparation method includes first adding H2O2 into modified polyether TPEG water solution under the temperature of 50-55 DEG C, stirring the mixture for 10-15min, simultaneously dropping mixed water solution of ascorbic acid and a chain transfer agent and single body B solution respectively and continuously conducting reaction for 0.5-1.0 hour in heat insulation mode after dropping is finished to obtain the polycarboxylic acid water reducer after pH value adjustment. The water reducer has higher water reducing rate, has low air content and a certain reducing function if used for concrete and is the multifunctional high-efficiency water reducer integrating water reducing, reducing and low air leading.

Description

technical field [0001] The invention belongs to the field of polycarboxylate concrete water-reducer, in particular to a low-air-entraining and shrinkage-reducing polycarboxylate concrete water-reducer and a preparation method thereof. Background technique [0002] Cracking of concrete due to shrinkage can lead to greatly reduced strength and durability of concrete, thereby further shortening the service life of concrete. The shrinkage and cracking of concrete, especially high-performance concrete, has attracted great attention from the engineering community. Although polycarboxylate water reducers can reduce the shrinkage of concrete to a certain extent, it is still difficult to meet the needs of the project. At the same time, polycarboxylate water reducers The high air content of the polycarboxylate superplasticizer also seriously affects the strength of the concrete, so reducing the shrinkage of the concrete and reducing the air content of the polycarboxylate superplastici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F283/06C04B103/30
Inventor 贾吉堂王景华段斌张静耿娟张岩松崔洪友王惠忠
Owner 山东华伟银凯建材科技股份有限公司
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