Preparation method of polycarboxylic acid water reducing agent suitable for mortar

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixture and building materials, can solve the problem of incapability of transplanting concrete water reducing agent, and achieve the effect of increasing workability, strong water retention capacity and good fluidity.

Active Publication Date: 2018-07-17
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the different action carriers, there are certain differences between the mortar water reducer and the c

Method used

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  • Preparation method of polycarboxylic acid water reducing agent suitable for mortar

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Embodiment 1

[0028] A preparation method suitable for a polycarboxylate water reducer for mortar, characterized in that it comprises the following steps:

[0029] 1) 110 parts of allyl polyoxyethylene ether with a molecular weight of 3000, 20 parts with a molecular weight of 5×10 5 , quaternary ammonium alkyl starch with a degree of substitution of 0.1, 200 parts with a molecular weight of 5×10 5 1. Add carboxymethyl starch with a degree of substitution of 0.6, 15 parts of acrylic acid and 250 parts of water into the reactor, and stir to dissolve it;

[0030] 2) Measure the temperature in the kettle, control the temperature in the kettle at 55°C, after the temperature is stable, add 1.8 parts of hydrogen peroxide at one time;

[0031] 3) After adding hydrogen peroxide for 5 minutes, start to drop the initiator and the small monomer solution in sequence. After the initiator is added, start to add the small monomer solution dropwise within 10 minutes. The small monomer solution is added for...

Embodiment 2

[0034] A preparation method suitable for a polycarboxylate water reducer for mortar, characterized in that it comprises the following steps:

[0035] 1) 120 parts of methallyl polyoxyethylene ether with a molecular weight of 3200, 24 parts with a molecular weight of 6×10 5 , tertiary amine alkyl starch with a degree of substitution of 0.15, 190 parts with a molecular weight of 6×10 5 1. Add carboxymethyl starch with a substitution degree of 0.7, 14 parts of acrylic acid and 230 parts of water into the reaction kettle, and stir to dissolve it;

[0036] 2) Measure the temperature in the kettle, control the temperature in the kettle at 49°C, after the temperature is stable, add 2 parts of hydrogen peroxide at one time;

[0037] 3) After adding hydrogen peroxide for 5 minutes, start to drop the initiator and the small monomer solution in sequence. After the initiator is added, start to add the small monomer solution dropwise within 10 minutes. The small monomer solution dripping ...

Embodiment 3

[0040] A preparation method suitable for a polycarboxylate water reducer for mortar, characterized in that it comprises the following steps:

[0041] 1) 137 parts of vinyl butyl ether polyoxyethylene ether with a molecular weight of 3500, 33 parts with a mass ratio of 1:1 and a molecular weight of 7×10 5 , a tertiary amine alkyl starch with a degree of substitution of 0.6 and a molecular weight of 7×10 5 1. A composition of quaternary ammonium alkyl starch with a degree of substitution of 0.3, 170 parts of carboxymethyl starch, 11 parts of acrylic acid and 210 parts of water are added to the reaction kettle, stirred to dissolve;

[0042] 2) Measure the temperature in the kettle, control the temperature in the kettle at 44°C, after the temperature stabilizes, add 2.3 parts of hydrogen peroxide at one time;

[0043] 3) After adding hydrogen peroxide for 5 minutes, start to drop the initiator and the small monomer solution in sequence. After the initiator is added, start to add ...

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Abstract

The invention provides a preparation method of a polycarboxylic acid water reducing agent suitable for mortar, and the method comprises the following steps: 1) adding a certain proportion of polyethermacromonomer, cationic starch ether, anionic starch ether, acrylic acid and water to a reaction kettle, and stirring for dissolving; 2) at a constant temperature of 35-55 DEG C, beginning to add dropwise a certain amount of hydrogen peroxide; 3) 5 min after adding of the hydrogen peroxide, beginning to add dropwise an initiator and a small monomer solution in turn, to be more specific, after theinitiator is added dropwise, within 10 min the small monomer solution is added dropwise, the small monomer solution dropwise addition time is a hours, the initiator dropwise addition time is a+0.5 hours, the initiator comprises a certain proportion of thioglycolic acid, vitamin C and water, and the small monomer solution comprises a certain proportion of acrylic acid, alkyl acrylate, and water; and 4) after the end of the dropwise addition, adding dextrose monohydrate to the system, keeping the temperature constant, curing for b hours, when the temperature is lower than 30 DEG C, slowly addingliquid caustic soda, adjusting the pH to 5.0, supplementing water, and stirring evenly to obtain the polycarboxylic acid water reducing agent suitable for the mortar.

Description

technical field [0001] The invention belongs to the technical field of building materials, relates to the field of concrete admixtures, in particular to a preparation method of a polycarboxylate water reducer suitable for mortar. Background technique [0002] Construction mortar is one of the most widely used building materials in construction projects, and is widely used in masonry, plastering, repairing, grouting and pasting of decorative materials. The traditional mortar production methods are divided into wet-mix mortar and dry-mix mortar, but no matter which method requires the participation of water reducing agent. Due to the different action carriers, there are also certain differences between the mortar water reducer and the concrete water reducer, so the concrete water reducer cannot be simply transplanted to the production of mortar. Mortar with excellent working performance should have good cohesion, water retention and long retarding time. These requirements hav...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F291/12C08F220/06C08F220/20C04B103/30
CPCC04B24/2694C04B2103/302C08F251/00C08F283/065C08F220/06
Inventor 柯凯罗正权
Owner HUBEI UNIV OF TECH
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