Slump retention type solid poly carboxylic acid water reducing agent and preparation method thereof

A polycarboxylic acid and slump-preserving technology, applied in the field of slump-preserving solid polycarboxylate water reducing agent and its preparation, can solve the problems of inability to achieve green environmental protection, complex preparation process, and high equipment cost, and achieve a conversion rate of green and no Effects of pollution, simple operation and short reaction time

Pending Publication Date: 2018-10-26
SHANXI SUNWAY INTION TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although the solid polycarboxylate superplasticizers on the market reduce the transportation cost, most of the preparation process is complicated. The reaction system contains organic solvents, which cannot meet the requirements of environmental protection. The removal of organic solvents makes the equipment cost high and the process complicated. , The energy consumption of the reaction is large; the performance decreases after melting again; therefore, the development of a low-cost, simple preparation process, low energy consumption, environmental protection and pollution-free, high-performance solid polycarboxylate water reducer has become the current new situation

Method used

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  • Slump retention type solid poly carboxylic acid water reducing agent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Add 360g of allyl alcohol polyoxyethylene ether (weight average molecular weight 1200) into a four-necked flask reaction kettle, heat to 60°C and stir to melt it;

[0024] Step 2: Add 14.7 g of maleic anhydride and 1.75 g of cumene hydroperoxide to the molten allyl alcohol polyoxyethylene ether macromer obtained in step 1, and stir evenly to obtain a mixed solution A;

[0025] Step 3: Add dropwise the mixed solution B consisting of 2.0g N,N-diethylaniline, 1.2g mercaptopropionic acid and a small amount of water to the mixed solution A in step 2, then add dropwise the mixed solution B consisting of 58.8g maleic anhydride and 91.8g Mixed solution C composed of hydroxymethyl acrylate, 2.5g dimethyl azobisisobutyrate was added after 2 minutes, in which mixed solution B and mixed solution C were added dropwise for 2h and 1.5h respectively. The temperature of the process system is maintained between 65-70°C;

[0026] Step 4: Add 9 g of potassium hydroxide aqueous sol...

Embodiment 2

[0028] Step 1: Add 360g of methallyl polyoxyethylene ether (weight average molecular weight: 2400) into a four-necked flask reactor, heat to 65°C and stir to melt it;

[0029] Step 2: Add 5.4 g of methacrylic acid and 1.4 g of tert-butyl hydroperoxide to the molten methallyl polyoxyethylene ether macromonomer obtained in step 1, and stir evenly to obtain a mixed solution A;

[0030] Step 3: Add dropwise the mixed solution B consisting of 1.9g N,N-diethylaniline, 2.2g sodium methacrylate and a small amount of water to the mixed solution A in step 2, and then add dropwise the mixed solution B composed of 26.83g methyl Mixed solution C composed of acrylic acid and 52.2g hydroxyethyl methacrylate, add 2.6g of azobisisoheptanonitrile after 2 minutes, in which mixed solution B and mixed solution C were added dropwise for 2h and 1.5h respectively, and kept for 1h after dropping , the temperature of the system during the whole reaction process is maintained between 70-75°C;

[0031] ...

Embodiment 3

[0033] Step 1: Add 360g of prenol polyoxyethylene ether (weight average molecular weight 2400) into a four-necked flask reaction kettle, heat to 70°C and stir to melt;

[0034] Step 2: Add 6.75 g of acrylic acid and 1.6 g of ammonium persulfate to the molten prenol polyoxyethylene ether macromonomer obtained in Step 1, and stir evenly to obtain a mixed solution A;

[0035] Step 3: Add dropwise the mixed solution B consisting of 1.9g N,N-diethylaniline, 1.2g mercaptopropionic acid and a small amount of water to the mixed solution A in step 2, then add dropwise the mixed solution B consisting of 20.25g acrylic acid and 52.2g acrylic acid For the mixed solution C composed of hydroxyethyl ester, 2.8g of azobisisobutyronitrile was added after 2 minutes, and the mixed solution B and the mixed solution C were added dropwise for 2h and 1.5h respectively. Between 75-80°C;

[0036] Step 4: Add 10 g of sodium hydroxide aqueous solution with a mass fraction of 60% to neutralize the react...

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Abstract

The invention discloses a slump retention type solid poly carboxylic acid water reducing agent and a preparation method thereof and belongs to the technical field of concrete admixtures. The slump retention type solid poly carboxylic acid water reducing agent is prepared from an unsaturated polyoxyethylene ether macromonomer, an organic oxidant, an unsaturated carboxylic acid small monomer, an unsaturated ester small monomer, an organic reducer, a chain transfer agent and a neutralizer. The slump retention type solid poly carboxylic acid water reducing agent has remarkable properties of high water reduction and high slump retention under low doping amount, is good in slump retention stability performance and long in durability and is capable of greatly lowering the packaging cost and the transportation cost when being in a solid form.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a slump-retaining solid polycarboxylate water reducer and a preparation method thereof. Background technique [0002] At present, polycarboxylate high-performance water reducer has become an indispensable part of modern concrete. It has a large degree of freedom in molecular structure design, green production, and shows high water reduction and low slump loss under low dosage conditions. And other advantages, widely used in various concrete engineering technology fields. And most of the currently commercially available products are solvent-type (concentration is 10%-50%) or powder type (obtained by high-temperature spray drying), wherein, the solvent-type not only increases the packaging cost and transportation cost of the product, but also is unfavorable for long-distance Transportation and export: Although the powder type is better than liquid in terms of packaging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/20C08F222/06C08F220/06C08F222/02C08F220/18C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F220/1808
Inventor 周普玉王丽秀王英维张智达
Owner SHANXI SUNWAY INTION TRADE CO LTD
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