Slump loss resistant type gather carboxylate water-reducing agent and preparation method thereof

A technology of polycarboxylate and water reducing agent, applied in the field of concrete admixtures, can solve the problems of unstable raw materials of macromolecular monomers, complicated intermediate separation and purification process, great influence of cement hydration, etc., and achieves superior performance and easy promotion. , the effect of low price

Active Publication Date: 2012-06-20
山西山大合盛新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent CN 1667009A reports the preparation of a carboxylic acid graft copolymer concrete slump-retaining agent. The preparation of its macromonomer is completed by the graft reaction of monoalkyl polyether or dihydroxy polyether and small molecule unsaturated acid Yes, this step of synthesis is difficult, the intermediate separation and purification process is more complicated, the raw material of the synthesized macromonomer is unstable, and the cost of industrialization is relatively high
The products currently on the market are mainly allyl polyoxyethylene ethers. This type of polyether has low activity and can only be well copolymerized with maleic anhydride. The double carboxyl group of anhydride makes this kind of polycarboxylate superplasticizer have a great influence on the hydration of cement

Method used

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  • Slump loss resistant type gather carboxylate water-reducing agent and preparation method thereof

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Effect test

Embodiment 1

[0041] Add 150g of IB-500 and 100.0g of deionized water into a 1000ml four-neck flask equipped with mechanical stirring, temperature controller, and dripping device, and heat up while stirring and dissolving. When the temperature rises to 50°C, add 1.1g of 30% Hydrogen peroxide, when the temperature reaches 60 ℃, start to drop the mixed aqueous solution of acrylic acid and acrylamide (43.2g of acrylic acid, 63.9g of acrylamide dissolved in 26.8g of deionized water), the mixed solution of vitamin C and thioglycolic acid (0.5g Vitamin C, 0.3g thioglycolic acid dissolved in 39.2g deionized water), the adding time of the mixed solution of acrylic acid and acrylamide is controlled at 2.5 hours, the dropping time of vitamin C solution is controlled at 3h, and the reaction temperature is controlled at 60±2°C . After the dropwise addition, continue to keep warm for 0.5 hours, then cool to below 40°C, add sodium hydroxide aqueous solution (24.0g sodium hydroxide dissolved in 231.1g dei...

Embodiment 2

[0043]Add 160g of IB-1000 and 106.7g of deionized water into a 1000ml four-neck flask equipped with mechanical stirring, temperature controller and dripping device, and heat up while stirring and dissolving. When the temperature rises to 50°C, add 1.0g of over Ammonium sulfate, when the temperature reaches 60 ° C, start to drop the mixed aqueous solution of acrylic acid and hydroxyethyl acrylate (34.6g of acrylic acid, 55.7g of hydroxyethyl acrylate dissolved in 22.6g of deionized water, the mixed solution of sodium sulfite and mercaptopropionic acid (0.4g of sodium sulfite, 0.4g of mercaptopropionic acid dissolved in 39.2g of deionized water), the dropping time of the mixed solution of acrylic acid and hydroxyethyl acrylate is controlled at 2.5 hours, the dropping time of sodium sulfite solution is controlled at 3h, and the reaction temperature is controlled at 60±2°C. After the dropwise addition, continue to keep warm for 0.5 hours, then cool to below 40°C, add sodium hydroxi...

Embodiment 3

[0045] Add 155g of IB-1500 and 103.3g of deionized water into a 1000ml four-neck flask equipped with mechanical stirring, temperature controller, and dripping device, and heat up while stirring and dissolving. When the temperature rises to 50°C, add 1.2g of over Potassium sulfate, when the temperature reaches 60°C, start to drop the mixed aqueous solution of acrylic acid and hydroxypropyl acrylate (22.3g of acrylic acid, 26.9g of hydroxypropyl acrylate dissolved in 12.3g of deionized water), vitamin C and thioglycolic acid solution (0.8g vitamin C, 0.5g mercaptoacetic acid dissolved in 63.7g deionized water), the dropping time of the mixed solution of acrylic acid and hydroxypropyl acrylate was controlled at 2.5 hours, the dropping time of the vitamin C solution was controlled at 3h, and the reaction temperature Controlled at 60±2°C. After the dropwise addition, continue to keep warm for 0.5 hours, then cool to below 40°C, add sodium hydroxide aqueous solution (12.4g sodium hy...

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Abstract

The invention provides a slump loss resistant type gather carboxylate water-reducing agent, which is a polymer of prenyl polyoxyethylene ether or prenyl polyoxyethylene propenyl ether or methyl allyl polyoxyethylene ether or methallyl polyoxyethylene propenyl ether (a macro-monomer A) and unsaturated carboxylic acid (a micro-monomer B) and an unsaturated carboxylic acid derivative (a micro-monomer C), belonging to the field of concrete admixtures. A synthetic method is as follows: the water-reducing agent is prepared by initiating the macro-monomer A, the micro-monomer B and the micro-monomer C through an oxidative-reductive initiating system by taking water as a solvent at lower temperature, and carrying out copolymerization under the action of a chain transfer agent. The water-reducing agent overcomes the disadvantages of being poor in slump loss resistance, long in setting time and the like of the water-reducing agent synthesized by allyl polyoxyethylene ether and has the advantages of being high in slump loss resistance, good for being suitable to different cements and low in influence on concrete setting time.

Description

technical field [0001] The invention relates to a concrete admixture in building materials, in particular to a slump-retaining polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Compared with traditional high-efficiency water reducers, polycarboxylate water reducers have the advantages of low dosage, high water reducing rate, and flexible molecular structure, but in the face of domestic complex and changeable cement and concrete materials, polycarboxylate Water reducers often do not reflect the advantages of their high performance. In some projects, polycarboxylate water reducers often encounter cement adaptability problems such as low water reducing rate, rapid slump loss, and poor workability of concrete. [0003] The most common problem in cement suitability is excessive slump loss. At present, there are five main methods to reduce the slump loss of water reducer: (1) composite retarding component; (2) repeated addition of wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F4/40C08F2/10C04B24/26C04B103/30
Inventor 裴继凯李军平王正波赵婷婷刘学明曹永旺张宝川王自卫
Owner 山西山大合盛新材料股份有限公司
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