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Synthetic method of polycarboxylate water reducer

A synthesis method and technology of water reducing agent, applied in the field of materials, can solve the problems of low water reducing rate and complicated process of water reducing agent, and achieve the effects of reducing hydrolysis, inhibiting quantity reduction and ensuring effective content

Pending Publication Date: 2021-02-19
浙江和业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the existing water reducing agent is not only complicated but also has a low water reducing rate, which cannot meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for synthesizing a polycarboxylate water reducer, comprising an esterification process and a polymerization process;

[0020] The esterification process includes stirring and heating polyethylene glycol monomethyl ether, methacrylic acid and toluenesulfonic acid, stirring and heating at 117°C-123°C for 4 to 6 hours in a vacuum, and cooling to Discharge below 60°C to obtain large monomers;

[0021] The polymerization process includes adding polyethylene glycol monomethacrylate solution and water into a four-necked flask, stirring to raise the temperature to 75°C-85°C, slowly adding ammonium persulfate, acrylic acid and acrylamide dropwise, and reacting for 2.8-3.2 hours , heat preservation for half an hour, acrylamide modified polycarboxylate superplasticizer can be obtained.

Embodiment 2

[0023] A method for synthesizing a polycarboxylate water reducer, comprising an esterification process and a polymerization process;

[0024] The esterification process includes stirring and heating polyethylene glycol monomethyl ether, methacrylic acid and toluenesulfonic acid, stirring and heating at 117°C-123°C for 4 to 6 hours in a vacuum, and cooling to The macromonomer is obtained by discharging below 60°C; in the esterification process, add polyethylene glycol monomethyl ether, methacrylic acid and toluenesulfonic acid into a 500ml four-necked flask equipped with a stirrer, stir and heat at 120°C Vacuum reaction for 5 hours. In the esterification process, the temperature of the reactor is 120°C, and the pressure is not higher than 0.2Mpa; the reaction temperature is increased to 130-150°C after passing through propylene oxide to initiate the reaction, and the temperature is maintained at a reaction pressure of P<0.6 Under the condition of MPa, propylene oxide is contin...

Embodiment 3

[0027] A method for synthesizing a polycarboxylate water reducer, comprising an esterification process and a polymerization process;

[0028] The esterification process includes stirring and heating polyethylene glycol monomethyl ether, methacrylic acid and toluenesulfonic acid, stirring and heating at 117°C-123°C for 4 to 6 hours in a vacuum, and cooling to The macromonomer is obtained by discharging below 60°C; in the esterification process, add polyethylene glycol monomethyl ether, methacrylic acid and toluenesulfonic acid into a 500ml four-necked flask equipped with a stirrer, stir and heat at 120°C Vacuum reaction for 5 hours. In the esterification process, the temperature of the reactor is 120°C, and the pressure is not higher than 0.2Mpa; the reaction temperature is increased to 130-150°C after passing through propylene oxide to initiate the reaction, and the temperature is maintained at a reaction pressure of P<0.6 Under the condition of MPa, propylene oxide is contin...

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Abstract

The invention discloses a synthetic method of a polycarboxylate water reducer. The synthetic method comprises an esterification process and a polymerization process; the esterification process comprises the steps: stirring and heating polyethylene glycol monomethyl ether, methacrylic acid and toluenesulfonic acid, stirring and heating, vacuumizing and reacting, and after the reaction is finished,cooling and discharging to obtain a macromonomer; the polymerization process comprises the steps: adding a polyethylene glycol monomethacrylate solution and water into a four-neck flask, stirring andheating, slowly dropwise adding ammonium persulfate, acrylic acid and acrylamide, and keeping the temperature for half an hour to obtain the acrylamide modified polycarboxylate water reducer. According to the preparation method, methoxypolyethylene glycol, methacrylic acid and toluenesulfonic acid are stirred, heated, vacuumized, reacted and cooled to obtain the macromonomer, so that the preparation process is simplified, and the effective content of the macromonomer is guaranteed; the continuous esterification reaction of the macromonomers is terminated through rapid cooling, so that the reduction of the number of the esterified macromonomers in the mixture is inhibited, and the hydrolysis of the ester is reduced.

Description

technical field [0001] The present invention relates to a kind of material technical field, specifically, relate to a kind of synthetic method of polycarboxylate water reducing agent. Background technique [0002] Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete basically unchanged. Most of them are anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer, etc. After being added to the concrete mixture, it can disperse the cement particles, improve its workability, reduce the unit water consumption, improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement. However, the preparation process of the existing water reducer is not only complicated but also has a low water reducing rate, so it cannot meet the requirements. Contents of the invention [0003] To achieve the above object, the present invention provides a synthesis method ...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/56C04B24/16C04B103/30
CPCC08F283/065C04B24/165C04B2103/302C08F220/06C08F220/56
Inventor 张默然孙文沈浩哲
Owner 浙江和业科技有限公司
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