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Preparation method of modified polycarboxylic acid slump-retaining agent masterbatch

A technology of polycarboxylic acid and slump-retaining agent, which is applied in the field of cement additives, can solve problems such as reducing the reactivity of acrylic acid double bonds, disturbing the polymerization effect of acrylic acid and hydroxyethyl acrylate, and achieving reduction of main chain polymerization and disturbance of long and short branch chains, The requirements for production equipment are not high, and the effect of eliminating pipe plugging

Inactive Publication Date: 2017-02-01
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AMPS has a carbon-carbon double bond for chain polymerization activity, but the long-chain structure of the sulfonic acid group on one side of the AMPS molecule may reduce the double bond reactivity of acrylic acid, which will disturb the polymerization effect of acrylic acid and hydroxyethyl acrylate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A post-AMPS post-addition modified polycarboxylate slump-retaining agent masterbatch and its preparation method, the slump-retaining agent is formed by polymerizing the following components by mass percentage, the total mass of raw materials is 1000, each component and process parameters are as follows :

[0033] Primer: methallyl polyoxyethylene ether with a molecular weight of 2400: 332, water: 220;

[0034] Hydrogen peroxide solution: 27.5% Industrial grade hydrogen peroxide: 3.0, water: 10;

[0035] Add the initiator and the small monomer solution sequentially within 10 minutes after adding the hydrogen peroxide;

[0036] Initiator: thioglycolic acid: 1.55, vitamin C: 0.70, water: 110;

[0037] Small monomer solution: acrylic acid: 20.5, hydroxyethyl acrylate: 37.8, water: 65;

[0038] Initiator dropping time: 3.5h;

[0039] The small monomer solution dripping time is 3.0h;

[0040] Now prepare AMPS solution: AMPS: 3.3, water: 10;

[0041] When the small monom...

Embodiment 2

[0047] Primer: 2400 molecular weight isopentenol polyoxyethylene ether: 320, water: 200;

[0048] Hydrogen peroxide solution: 27.5% Industrial grade hydrogen peroxide: 2.5, water: 10;

[0049] Add the initiator and the small monomer solution sequentially within 10 minutes after adding the hydrogen peroxide;

[0050] Initiator: mercaptopropionic acid: 1.65, vitamin C: 0.75, water: 110;

[0051] Small monomer solution: acrylic acid: 24, hydroxyethyl acrylate: 42.6, water: 70;

[0052] Initiator dropping time: 4.0h;

[0053] The small monomer solution dripping time is 3.5h;

[0054] Now prepare AMPS solution: AMPS: 3.7, water: 10;

[0055] When the small monomer solution was added dropwise for 1.16h, the AMPS solution began to be added dropwise, and the dropping time was 0.58h;

[0056] Curing time: 2.0h;

[0057] Liquid caustic: 12;

[0058] Hydration: 192.8.

[0059] Standing time: 12h.

Embodiment 3

[0061] Primer: 3000 molecular weight isobutylene alcohol polyoxyethylene ether: 109, 2400 molecular weight isobutylene alcohol polyoxyethylene ether: 218, water: 250;

[0062] Hydrogen peroxide solution: 27.5% Industrial grade hydrogen peroxide: 4.5, water: 10;

[0063] Add the initiator and the small monomer solution sequentially within 10 minutes after adding the hydrogen peroxide;

[0064] Initiator: mercaptopropionic acid: 1.40, vitamin C: 0.92, water: 118;

[0065] Small monomer solution: acrylic acid: 22.5, hydroxyethyl acrylate: 44.8, water: 55;

[0066] Initiator dropping time: 3.5h;

[0067] The small monomer solution dripping time is 3.0h;

[0068] Now prepare AMPS solution: AMPS: 6.2, water: 15;

[0069] When the small monomer solution is added dropwise for 1.0h, the AMPS solution starts to be added dropwise, and the dropping time is 0.5h;

[0070] Curing time: 2.0h;

[0071] Liquid caustic: 14;

[0072] Hydration: 130.68.

[0073] Standing time: 15h.

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Abstract

The invention discloses a preparation method of modified polycarboxylic acid slump-retaining agent masterbatch. The method includes the following steps that 1, polyether macromonomers and water in a certain proportion are added into a reaction kettle and stirred for dissolution; 2, an oxidizing agent is added at a time at 5-25 DEG C, and an initiating agent and a micromonomer solution start to be dropwise added in sequence within 5 min after the oxidizing agent is added; 3, an AMPS solution is added at a time or dropwise added a / 3 h after the micromonomer solution is added; 4, curing is carried out for 1-2 h after dropwise addition is finished, liquid alkali is slowly added when the temperature of the reaction solution is lower than 30 DEG C, water is supplemented, and the mixture is stirred to be uniform and then still standing for 10-15 h. The preparation method is simple in process, the phenomenon of pipeline blocking caused by AMPS homopolymerization or copolymerization is eradicated to the maximum, and the obtained slump-retaining agent has a slow release slump-retaining function and a certain early strength function and has a good application effect when used in cooperation with a water reducing agent with a high water reducing rate.

Description

technical field [0001] The invention relates to a polycarboxylic acid admixture for cement-based cementitious materials, in particular to a preparation method of a modified polycarboxylic acid slump-retaining agent masterbatch, and belongs to the field of cement additives. Background technique [0002] AMPS (2-acrylamide-2-methylpropanesulfonic acid) can provide extremely polar anionic sulfonic acid groups and amide groups, and the role of the sulfonic acid group in the molecular structure of the water reducer is the same as that of the carboxyl group , the difference is that the leading role of the sulfonic acid group is efficient dispersion to produce high water reducing rate, and the leading role of the carboxyl group is retarding and slump retention. The amide group is adsorbed on C 3 A surface and promote its dispersion, speed up C 3 A hydration accelerates the formation of ettringite and inhibits the loose structure formed in the early stage of cement strength develo...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/28C08F220/06C08F220/58C08F2/38C04B24/16C04B103/30
CPCC04B24/165C04B2103/308C08F2/38C08F283/065C08F220/281
Inventor 柯凯苏英贺行洋王迎斌常鹰
Owner HUBEI UNIV OF TECH
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