Modifier for polycarboxylate-type water reducer for concrete and preparation method of modifier

The technology of a polycarboxylic acid system and a regulator is applied in the field of concrete admixtures, which can solve problems such as uneven quality, and achieve the effects of improving slump retention performance, simple raw material formulation, and good slump retention performance.

Active Publication Date: 2015-05-13
CHONGQING XINCAI CONCRETE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous expansion of the city scale, natural resources such as sand and gravel are becoming more and more scarce, and the quality is uneven. In addition to the city's green environmental protection requirements, the transportation distanc

Method used

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  • Modifier for polycarboxylate-type water reducer for concrete and preparation method of modifier
  • Modifier for polycarboxylate-type water reducer for concrete and preparation method of modifier
  • Modifier for polycarboxylate-type water reducer for concrete and preparation method of modifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare the regulator for concrete polycarboxylate water reducer according to the following raw material quantity and process

[0029] Material preparation:

[0030] Add 3g of azobisisobutamidine hydrochloride and 2.5g of trisodium phosphate into 55g of deionized water, mix well, which is material A; add 7.8g of crotonic acid, 15.1g of tert-butylacrylamide sulfonic acid, and add 30g to remove Ionized water, mixed evenly, is B material;

[0031] polymerization:

[0032] Add 125 g of deionized water, 175 g of polyethylene glycol prenyl ether and 10.8 g of itaconic anhydride to a glass reactor equipped with a thermometer and an electric mixer, stir to dissolve and heat to 30°C, adding a mass concentration of 30% Add 3.5g of hydrogen peroxide. After stirring evenly, first add material A, and then add material B at the same time after 5 minutes, add material A for 3 hours, add material B for 2.5 hours, and keep the temperature for 0.5 hours after the addition of material A. Cool d...

Embodiment 2

[0035] Prepare the regulator for concrete polycarboxylate water reducer according to the following raw material quantity and process

[0036] Material preparation:

[0037] Add 3.2g of azobisisobutamidine hydrochloride and 2.6g of trisodium phosphate into 52g of deionized water, mix well, it is material A; add 9.5g of crotonic acid, 18.1g of tert-butylacrylamide sulfonic acid, and add 31g Mix well in deionized water, it is B material;

[0038] polymerization:

[0039] Add 122g of deionized water, 175g of polyethylene glycol isoamyl ether and 7.1g of itaconic anhydride to a glass reactor equipped with a thermometer and an electric mixer, stir to dissolve and heat to 30 degrees, adding a mass concentration of 30% 3.8g of hydrogen peroxide, stir evenly, first add material A, and then add material B at the same time after 5 minutes, add material A for 3 hours, add material B for 2.5 hours, and keep the temperature for 1 hour after the addition of material A. To below 45 degrees, neutral...

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Abstract

The invention relates to a modifier for a polycarboxylate-type water reducer for concrete and a preparation method of the modifier. The modifier is prepared by polymerizing polyethylene glycol isoamyl allyl ether, itaconic anhydride, t-butyl acrylamide sulfonic acid and crotonic acid unsaturated monomers in the presence of an initiator and a molecular weight modifier in a water solution. The modifier has the advantages that the doping amount is low, the cement adaptability is good, the holding capacity of slump constant of concrete is strong, the cost is low and synthesizing process is carried out at normal temperature. The preparation method of the modifier has the beneficial effects that the process is simple, the energy is saved in a synthetic production process, and the production cost is effectively lowered.

Description

Technical field [0001] The invention relates to a concrete admixture, in particular to a regulator for concrete polycarboxylic acid water reducer and a preparation method. Background technique [0002] With the continuous advancement of my country's urbanization, construction technology has also been continuously developed, and the construction industry has higher and higher requirements for concrete technology. Traditional naphthalene series and aliphatic water reducers can no longer meet the technical requirements of modern concrete. Polycarboxylic acid superplasticizer has become the trend of admixture development due to its advantages such as low dosage, high water reduction rate, small slump loss, good compatibility with different cements and admixtures, and green products. However, with the continuous expansion of the scale of cities, natural resources such as sand and gravel are becoming more and more scarce, and the quality is uneven. In addition to the requirements of ur...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F222/02C08F222/04
Inventor 王维勇董强田少宁李清龙陈永齐
Owner CHONGQING XINCAI CONCRETE GRP
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