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Method for preparing polycarboxylic concrete water reducer with high slump retention capacity, and construction method of polycarboxylic concrete water reducer

A technology of concrete water-reducing agent and polycarboxylic acid, applied in the field of concrete water-reducing agent, can solve the problems of low dosage and single component, and achieve the effects of low dosage, good adaptability and control of slump loss

Inactive Publication Date: 2013-04-10
江西迪特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to prepare a high-slump polycarboxylate superplasticizer with single component and low dosage without changing the existing production process

Method used

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  • Method for preparing polycarboxylic concrete water reducer with high slump retention capacity, and construction method of polycarboxylic concrete water reducer
  • Method for preparing polycarboxylic concrete water reducer with high slump retention capacity, and construction method of polycarboxylic concrete water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a 2-liter four-neck bottle equipped with a thermometer and a dropping funnel, add 1.0 mole-average polyethylene glycol monomethyl ether monomer with a molecular weight of 1200, heat up to 50°C and melt, add 3.45 grams of concentrated sulfuric acid catalyst, and stir for 10 minutes. Then add 0.87 grams of hydroquinone polymerization inhibitor, continue to stir, and then add 2.0 moles of monomeric methacrylic acid after stirring evenly, then raise the temperature of the above-mentioned mixture to 80°C, and react at constant temperature for 4 hours, and remove water through water-carrying agent benzene on the way, that is The oligomer polyethylene glycol monomethyl ether methacrylate was prepared.

[0024] Mix 1 mole of the prepared oligomer polyethylene glycol monomethyl ether methacrylate with 1.5 moles of monomer methacrylic acid, then add 0.31 grams of chain transfer agent thioglycolic acid, 1397 g of 0.01% of the total mass of the reaction system The water is stirr...

Embodiment 2

[0026] In a 2-liter four-necked bottle equipped with a thermometer and a dropping funnel, add 1.0 mole-average polyethylene glycol monomethyl ether monomer with a molecular weight of 1500, heat up to 70°C and melt, add 27.6 grams of 36.5% concentrated hydrochloric acid catalyst, and stir for 30 Minutes later, add 6.89 grams of p-hydroxyanisole polymerization inhibitor, continue to stir, and then add 4 moles of monomeric methacrylic acid after stirring evenly, then raise the temperature of the above mixture to 120°C, and react at constant temperature for 8 hours. Toluene is used to remove water, and the oligomer polyethylene glycol monomethyl ether methacrylate is obtained.

[0027] 1 mole of the prepared oligomer polyethylene glycol monomethyl ether methacrylate is mixed with 6 moles of monomeric acrylic acid, then add 22.08 grams of chain transfer agent mercapto propionic acid accounting for 0.5% of the total mass of the reaction system, add 1600 grams of The water is stirred...

Embodiment 3

[0029]In a 2-liter four-necked bottle equipped with a thermometer and a dropping funnel, add 1.0 mole-average polyethylene glycol monomethyl ether monomer with a molecular weight of 750, heat up to 60°C to melt, add 9.1 grams of p-toluenesulfonic acid catalyst, and stir for 20 minutes Finally, add 2.08 grams of sulfurized diphenylamine polymerization inhibitor, continue to stir, and then add 3.0 moles of monomeric acrylic acid after stirring evenly, then raise the temperature of the above mixture to 100 ° C, and react at constant temperature for 6 hours. The water is removed by distillation, and the oligomer polyethylene glycol monomethyl ether is obtained.

[0030] 1 mole of the prepared oligomer polyethylene glycol monomethyl ether acrylate is mixed with 4 moles of monomer methacrylic acid, and then 6.05 grams of chain transfer agent mercaptoethanol accounting for 0.18% of the total mass of the reaction system is added, and 1568 grams of water are added. Stir evenly to form ...

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Abstract

The invention provides a method for preparing a polycarboxylic concrete water reducer with high slump retention capacity. The method comprises the following steps: heating and melting a first monomer, adding a catalyst in the molten first monomer for stirring, then adding a polymerization inhibitor for continuous stirring, and then adding a second monomer; after performing thermostatic reaction on the mixture for a certain period of time, adding the second monomer, and then adding a chain transfer agent in the mixture to be evenly stirred to obtain a component 1; diluting an initiator with water to obtain a component 2; and simultaneously dripping the component 1 and the component 2 in a reaction vessel for reaction, and then adjusting the pH value of a reaction solution to be 6-8, so as to prepare the polycarboxylic concrete water reducer with high slump retention capacity. The prepared polycarboxylic concrete water reducer with high slump retention capacity has low dosage, can obviously control the slump loss, and enhance the adaptability to the cement variety, gypsum form, mixing proportion, water consumption and concrete mixing process; and the prepared polycarboxylic concrete water reducer with high slump retention capacity has good adaptability to the ambient temperature, and particularly has good slump retention capacity in high temperature.

Description

technical field [0001] The invention belongs to the technical field of concrete water reducer, in particular to a preparation method of polycarboxylate concrete water reducer. Background technique [0002] Concrete is a commonly used material in bridges, roads, construction and other projects. In order to meet the rapid development of other projects such as construction, higher requirements are put forward for the performance of concrete. Adding water reducing agent is one of the means to improve the performance of concrete. Polycarboxylate superplasticizer is a new type of high-efficiency chemical superplasticizer. Compared with traditional naphthalene superplasticizers, it has the advantages of low dosage, high water reducing rate, good slump retention, and moderate air-entrainment. Due to the rise of nuclear power, water conservancy, bridges, tunnels and other large-scale infrastructure in my country, especially the planning and implementation of the national railway pass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/06C08F220/14C08F220/18C04B24/26C04B103/30
Inventor 刘红霞宋冬生杨廷雄江科炜胡泊陈亚萍
Owner 江西迪特科技有限公司
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