Preparation method of modified carboxylic acid water reducer

A water-reducing agent and modification technology are applied in the field of preparation of modified carboxylic acid-based water-reducing agents, which can solve the problem of low slump retention effect and achieve the effect of improving dispersibility.

Inactive Publication Date: 2016-02-24
宋介珍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned polycarboxylate water reducer sti

Method used

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  • Preparation method of modified carboxylic acid water reducer
  • Preparation method of modified carboxylic acid water reducer
  • Preparation method of modified carboxylic acid water reducer

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The preparation method of water reducer:

[0021] Step 1, by weight, 5 parts of acrylamide, 15 parts of sodium lignosulfonate, 20 parts of maleic anhydride, 3 parts of methacrylic acid, 3 parts of dibutyl itaconate, 3 parts of dibutyl maleate 3 parts, 4 parts of KH-550 silane coupling agent, 2 parts of catalyst concentrated sulfuric acid, add in the reaction vessel with water bath; Then add 70 parts of deionized water in the reaction vessel, then pass nitrogen to the reaction vessel to deoxygenate and Perform a stirring reaction, the reaction temperature is 80°C; the reaction time is 2h;

[0022] Step 2, in parts by weight, add 30 parts of isopentenyl polyoxyethylene ether, 3 parts of maleic anhydride, 4 parts of cyclohexyl methacrylate, 5 parts of acrylic acid, 10 parts of maleic anhydride, 8 parts of sodium methacrylate, 5 parts of dimethylaminoethyl methacrylate, 5 parts of dimethyl azobisisobutyrate initiator, and then continue to flow nitrogen, and start the react...

Embodiment 2

[0025] Step 1, by weight, 8 parts of acrylamide, 30 parts of sodium lignosulfonate, 40 parts of maleic anhydride, 5 parts of methacrylic acid, 6 parts of dibutyl itaconate, 6 parts of dibutyl maleate 5 parts, 6 parts of KH-550 silane coupling agent, 4 parts of catalyst concentrated sulfuric acid, add in the reaction container that has water bath; Perform a stirring reaction, the reaction temperature is 90°C; the reaction time is 7h;

[0026] Step 2, in parts by weight, add 50 parts of isopentenyl polyoxyethylene ether, 5 parts of maleic anhydride, 6 parts of cyclohexyl methacrylate, 10 parts of acrylic acid, 15 parts of maleic anhydride, 15 parts of sodium methacrylate and 10 parts of dimethylaminoethyl methacrylate, 10 parts of dimethyl azobisisobutyrate initiator, then continue to flow nitrogen, start the reaction under stirring , the reaction temperature is 70°C, and the reaction time is 8 hours. After the end, the stirring is stopped and the nitrogen flow is stopped; afte...

Embodiment 3

[0029] Step 1, by weight, 6 parts of acrylamide, 20 parts of sodium lignosulfonate, 30 parts of maleic anhydride, 4 parts of methacrylic acid, 5 parts of dibutyl itaconate, 5 parts of dibutyl maleate 4 parts, 5 parts of KH-550 silane coupling agent, 3 parts of catalyst concentrated sulfuric acid, add in the reaction vessel with water bath; Then add 75 parts of deionized water in the reaction vessel, then pass nitrogen to deoxygenate in the reaction vessel and Perform a stirring reaction, the reaction temperature is 85°C; the reaction time is 5h;

[0030] Step 2, in parts by weight, add 40 parts of isopentenyl polyoxyethylene ether, 4 parts of maleic anhydride, 5 parts of cyclohexyl methacrylate, 8 parts of acrylic acid, 12 parts of maleic anhydride, 11 parts of sodium methacrylate, 8 parts of dimethylaminoethyl methacrylate, 8 parts of dimethyl azobisisobutyrate initiator, and then continue to flow nitrogen, and start the reaction under stirring , the reaction temperature is ...

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Abstract

The invention relates to a preparation method of a modified carboxylic acid water reducer. The preparation method comprises adding acrylamide, sodium lignosulphonate, maleic anhydride, methacrylic acid, dibutyl itaconate, dibutyl maleate, a silane coupling agent and a catalyst into a reactor with a water bath, adding deionized water into the reactor, feeding inert gas into the reactor to remove oxygen, carrying out a stirring reaction process, adding polyoxyethylene isopentenyl ether, maleic anhydride, cyclohexyl methacrylate, acyclic acid, maleic anhydride, sodium methallyl sulfonate, dimethylaminoethyl methacrylate and an azo-initiator into the mixture, continuously feeding inert gas into the mixture, carrying out a stirring reaction process, stopping stirring and inert gas feeding after the reaction is finished, adjusting pH by an alkaline solution and carrying out discharging to obtain the desired product. Through a polymerization monomer, a polycarboxylic acid host molecule is modified and cement particles can be coated so that dispersibility is improved.

Description

technical field [0001] The invention relates to a preparation method of a modified carboxylic acid-based water reducer, which belongs to the technical field of water reducers. Background technique [0002] Concrete water reducer refers to an admixture with water reducing and strengthening effects under the condition of maintaining the workability of concrete mixture, also known as "plasticizer", and high-efficiency water reducer is also called "superplasticizer". agent". Water reducers are mostly surfactants, and their molecular structure is composed of hydrophilic groups and hydrophobic groups; when cement is mixed with water to form cement slurry, cement particles wrap part of the water between the particles to form Flocculation structure, the role of water cannot be fully exerted; after adding water reducing agent, the surface active agent is oriented on the surface of cement particles, so that the surface of cement particles has the same charge, and this repulsion is ...

Claims

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Application Information

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IPC IPC(8): C08F291/14C08F291/06C08F222/06C08F220/06C08F228/02C08F222/14C08F220/34C04B24/16C04B103/30
CPCC08F289/00C04B24/163C04B2103/302C08F283/065
Inventor 宋介珍
Owner 宋介珍
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