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Collapse prevention type polycarboxylic acid water reducing agent and preparation method thereof

A polycarboxylic acid and slump-preserving technology, which is applied in the field of concrete admixture and its preparation, can solve the problems of cumbersome operation, high energy consumption, and long time consumption, and achieve simple operation, short reaction cycle, and reduced slump loss Effect

Active Publication Date: 2014-04-02
WUHAN HUAXUAN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation requires a two-step process of first esterification and then polymerization, which is cumbersome to operate, takes a long time and consumes high energy consumption.

Method used

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  • Collapse prevention type polycarboxylic acid water reducing agent and preparation method thereof
  • Collapse prevention type polycarboxylic acid water reducing agent and preparation method thereof
  • Collapse prevention type polycarboxylic acid water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 120g of methallyl polyoxyethylene ether, 25g of styrene, 25g of sodium methacrylate sulfonate and 120g of deionized water, place them in a reaction kettle and stir the materials to dissolve completely. Then, the temperature was raised to 50°C while stirring, and the solution A and solution B were evenly added dropwise. The composition of solution A is a uniform solution composed of 35g acrylic acid, 25g hydroxyethyl acrylate and 30g deionized water; the solution B is a uniform solution composed of 1g sodium persulfate, 1g thioglycolic acid and 20g deionized water. The temperature in the reaction kettle was controlled at 50°C, and at the same time, solution A and solution B were added dropwise. Control the dropping time of A solution to 3h, and the dropping time of B solution to 4h. After the dropwise addition of the two solutions was completed, stirring was continued for 1.5 h for aging. After the above steps are completed, cool to about 30°C, add lye to adjust t...

Embodiment 2

[0035] Take 120g of methallyl polyoxyethylene ether, 25g of styrene, 25g of sodium methacrylate sulfonate and 120g of deionized water, place them in a reaction kettle and stir the materials to dissolve completely. Then, the temperature was raised to 60°C while stirring, and the A solution and the B solution were started to be added dropwise evenly. The composition of solution A is a uniform solution composed of 35g acrylic acid, 25g hydroxyethyl acrylate and 30g deionized water; the solution B is a uniform solution composed of 1g sodium persulfate, 1g thioglycolic acid and 20g deionized water. The temperature in the reactor was controlled at 60°C, and at the same time, solution A and solution B were added dropwise. Control the dropping time of A solution to 3h, and the dropping time of B solution to 4h. After the dropwise addition of the two solutions was completed, stirring was continued for 1.5 h for aging. After the above steps are completed, cool to about 30°C, add lye t...

Embodiment 3

[0037] Take 120g of methallyl polyoxyethylene ether, 25g of styrene, 25g of sodium methacrylate sulfonate and 120g of deionized water, place them in a reaction kettle and stir the materials to dissolve completely. Then, the temperature was raised to 70°C while stirring, and the solution A and solution B were evenly added dropwise. The composition of solution A is a uniform solution composed of 35g acrylic acid, 25g hydroxyethyl acrylate and 30g deionized water; the solution B is a uniform solution composed of 1g sodium persulfate, 1g thioglycolic acid and 20g deionized water. The temperature in the reaction kettle was controlled at 70°C, and at the same time, solution A and solution B were added dropwise. Control the dropping time of A solution to 3h, and the dropping time of B solution to 4h. After the dropwise addition of the two solutions was completed, stirring was continued for 1.5 h for aging. After the above steps are completed, cool to about 30°C, add lye to adjust t...

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Abstract

The invention relates to a preparation method of collapse prevention type polycarboxylic acid water reducing agent. The method comprises the following specific steps: methyl allyl polyoxyethylene ether, styrene, sodium methallyl sulfonate and de-ionized water are put in a reaction kettle and evenly stirred for gradually heating to the temperature of 50-70 DEG C, then are gradually dripped with acrylic acid, hydroxyethyl acrylate, oxidizing agent, reducing agent and chain transfer agent; the whole dripping process lasts about 3-4 h; then the heat preservation and the curing are implemented for 1-2 h; finally, the temperature is decreased to 30-35 DEG C; the pH of the solution is adjusted to the neutral property; a proper amount of de-ionized water is added to obtain the colorless transparent collapse prevention type polycarboxylic acid water reducing agent. The used reaction equipment is simple; the reaction is easily controlled; the production cost is low; the water reducing rate is higher; the collapse prevention performance is excellent.

Description

technical field [0001] The invention relates to a concrete admixture and a preparation method thereof, in particular to a slump-retaining polycarboxylate water reducer and a preparation method thereof. technical background [0002] With the development of science and technology and the needs of construction projects, the research and production of concrete water reducers have tended to develop in the direction of high performance and pollution-free. The polycarboxylate high-efficiency water reducer represented by polyacrylate and its graft copolymer has become the development direction of the future high-efficiency water reducer due to its high water-reducing rate, low dosage, good dispersibility and other excellent properties. With the application of polycarboxylate superplasticizers in concrete engineering, some shortcomings have gradually emerged. For example, due to differences in temperature, raw materials and construction techniques, the slump of concrete will lose a ...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B103/30
Inventor 马保国汪杰谭洪波黄健
Owner WUHAN HUAXUAN HIGH TECH
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