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Preparation method for high-performance polycarboxylic acid water-reducing and slump-retaining agent

A polycarboxylic acid and high-performance technology, which is applied in the field of preparation of high-performance polycarboxylic acid water-reducing and slump-retaining agent, can solve the problems of low esterification rate, harm, environmental protection and other problems, achieve high esterification rate and avoid volatilization High performance and cost-saving effect

Active Publication Date: 2012-07-04
ZHEJIANG JISHENG CHEM BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the disadvantages of low esterification rate and insufficient environmental protection. In addition, the chain transfer agent of mercapto group used in this method has great harm to the human body.

Method used

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  • Preparation method for high-performance polycarboxylic acid water-reducing and slump-retaining agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Esterification reaction:

[0024] Add 2000Kg of polyethylene glycol (PEG200) and 1100Kg of maleic anhydride to the esterification kettle in sequence, start stirring, seal the esterification kettle, start to heat up to 105°C, keep the temperature for 4 hours, cool to 50°C to obtain the maleic anhydride poly Ethylene glycol ester, spare;

[0025] Polymerization:

[0026] Add 2500Kg deionized water into the stirring tank 1, start stirring and put in the following materials in sequence: 25kg vitamin C, 20kg 2-acrylamide-2-methylpropanesulfonic acid, 300kg maleic anhydride, 600kg maleic anhydride polyethylene glycol The esterified product is stirred into the head tank 1 for subsequent use, and 300kg dimethyl maleate is squeezed into the head tank 2 for subsequent use;

[0027] Add 4500Kg of deionized water to the polymerization reactor, start stirring and heat up, and then put 2400Kg of methallyl alcohol polyoxyethylene ether, 3-methyl-3-butene-1-ol polyoxyethylene ether i...

Embodiment 2

[0030] Esterification reaction:

[0031] Add 2000Kg of polyethylene glycol (PEG400) and 800Kg of maleic anhydride to the esterification kettle in turn, start stirring, seal the esterification kettle, start to heat up to 102°C, keep the temperature for 4.5h, cool to 50°C to obtain maleic anhydride Polyethylene glycol ester, standby;

[0032] Polymerization:

[0033] Add 3000Kg deionized water into the stirring tank 1, start stirring and put in the following materials in sequence: 20kg vitamin C, 10kg 2-acrylamide-2-methylpropanesulfonic acid, 300kg maleic anhydride, 800kg maleic anhydride polyethylene glycol The esterified product is stirred evenly, and is put into the head tank 1 for subsequent use, and after 100kg dimethyl maleate and 100kg monomethyl maleate are stirred in the stirring tank 2, they are put into the head tank 2 for subsequent use;

[0034] Add 4000Kg deionized water to the polymerization reactor, start stirring and raise the temperature, and then put 1200Kg...

Embodiment 3

[0037] Esterification reaction:

[0038] Add 2000Kg of polyethylene glycol (PEG400) and 800Kg of maleic anhydride to the esterification kettle in turn, start stirring, start to heat up to 98°C, keep the temperature for 4.5h, cool to 50°C to obtain maleic anhydride polyethylene glycol ester ,spare;

[0039] Polymerization:

[0040] Add 3000Kg deionized water to the stirring tank 1, start stirring and put in the following materials in sequence: 15kg vitamin C, 15kg 2-acrylamide-2-methylpropanesulfonic acid, 400kg maleic anhydride, 700kg maleic anhydride polyethylene glycol The esterified product is stirred evenly, and is put into the head tank 1 for subsequent use, and after 100kg dimethyl maleate and 100kg monomethyl maleate are stirred in the stirring tank 2, they are put into the head tank 2 for subsequent use;

[0041] Add 4000Kg deionized water to the polymerization reactor, start stirring and heat up, then put 4800Kg of 3-methyl-3-buten-1-ol polyoxyethylene ether into it...

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Abstract

The invention provides a preparation method for a high-performance polycarboxylic acid water-reducing and slump-retaining agent. The method comprises the following steps of: (1) reacting polyethylene glycol and maleic anhydride in an enclosed reaction kettle at the temperature of 80-130 DEG C for 2-6 hours to obtain a maleic anhydride polyethylene glycol ester; (2) uniformly mixing diluted water, vitamin C serving as a reducting agent, maleic anhydride, 2-acrylamide-2-methyl propane sulfonic acid and the maleic anhydride polyethylene glycol ester obtained in the step (1), pumping into a high-level groove 1, uniformly stirring dimethyl maleate or a mixture of the dimethyl maleate and monomethyl maleate, and pumping into a high-level groove 2 for later use; and (3) adding a polyether monomer, hydrogen peroxide and water into a polymerizing kettle, heating, controlling the temperature between 50 DEG C and 70 DEG C, uniformly dropwise adding materials in the high-level groove 1 and the high-level groove 2 into the polymerizing kettle simultaneously, preserving heat for 0.5-2 hours after adding, neutralizing the pH value to 5-7 with liquid alkali, adding water till needed concentration is reached, and discharging to obtain the high-performance polycarboxylic acid water-reducing and slump-retaining agent. The polycarboxylic acid water-reducing and slump-retaining agent prepared with the method has excellent slump-retaining performance, and is environmentally-friendly.

Description

(1) Technical field [0001] The invention relates to a preparation method of a high-performance polycarboxylic acid water-reducing and slump-retaining agent. (2) Background technology [0002] Compared with traditional high-efficiency water reducers, although polycarboxylate water reducers have many advantages such as high water reducing rate and flexible molecular structure, there are also limitations in their performance in the face of domestic complex and changeable cement and concrete materials. Some deficiencies, such as the adaptability of polycarboxylate superplasticizers to cement, are prominently manifested in the fact that when the cement changes, the rate of concrete slump loss sometimes accelerates sharply, resulting in greater concrete slump loss, which affects engineering use. . For this reason, the industry usually uses polycarboxylate water reducers and retarders such as sodium gluconate and sucrose to improve the slump retention ability of water reducers. H...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F283/06C08G65/48C04B24/16C04B103/30
Inventor 韩玉龙黄阳波
Owner ZHEJIANG JISHENG CHEM BUILDING MATERIALS
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