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Cross-linking type low-sensitivity polycarboxylate water reducing agent and preparation method thereof

A low-sensitivity, polycarboxylic acid technology, applied in the field of building materials, can solve the problems of water reducing agent dosage sensitivity, dosage sensitivity has not been improved, etc., to achieve good anti-intercalation effect, excellent low-sensitivity performance, slow water The effect of speed

Active Publication Date: 2016-11-16
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the slump retention and workability can be improved through the above methods, the sensitivity of the dosage has not been improved. At present, the large monomers used in the Chinese market are HPEG, TPEG and MPEG. The polycarboxylic acid-based high-performance water reducer prepared by the monomer is more sensitive to the dosage. To improve this performance, a breakthrough in the aspect of the macromonomer is needed.

Method used

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  • Cross-linking type low-sensitivity polycarboxylate water reducing agent and preparation method thereof
  • Cross-linking type low-sensitivity polycarboxylate water reducing agent and preparation method thereof
  • Cross-linking type low-sensitivity polycarboxylate water reducing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] (1) Dissolving 180 g of VPEG-type monomer 4-hydroxybutyl vinyl polyoxyethylene ether with a number-average molecular weight of 2000 in 180 g of deionized water, and adjusting its temperature to 15 ° C, obtains the first solution;

[0044] (2) acrylic acid 26g and mercaptopropionic acid 1.5g are dissolved in 20g deionized water, then 10g 30% potassium hydroxide solution is added to carry out partial neutralization to obtain the second solution;

[0045] (3) 0.6g sodium formaldehyde sulfoxylate is dissolved in 30g deionized water to obtain the third solution;

[0046] (4) drip 22g of the second solution into the first solution, and keep the temperature at 15°C;

[0047] (5) 3 g of 2-methacryloyloxyethyl phosphate and 1 g of di(hydroxyethyl acrylate) phosphate are added to the remaining second solution;

[0048] (6) 0.05g ferrous sulfate and 2.5g hydrogen peroxide (30%) are successively added to the material obtained in step (4), and then the material obtained in step (5)...

Embodiment 2

[0050] (1) Dissolving 180g of VPEG-type monomer 4-hydroxybutyl vinyl polyoxyethylene ether with number-average molecular weight of 2400 in 180g deionized water, and adjusting its temperature to 15°C, obtains the first solution;

[0051] (2) 24g of acrylic acid and 1.4g of thioglycolic acid are dissolved in 20g of deionized water, and then 9g of 30% sodium hydroxide solution is added for partial neutralization to obtain the second solution;

[0052] (3) 0.6g FF6 is dissolved in 30g deionized water to obtain the third solution;

[0053] (4) drip 20g of the second solution into the first solution, and keep the temperature at 15°C;

[0054] (5) 2 g of 2-methacryloyloxypropyl phosphate and 1 g of di(hydroxyethyl acrylate) phosphate are added to the remaining second solution;

[0055] (6) successively adding 0.055g ferrous sulfate and 2.5g hydrogen peroxide (30%) to the material obtained in step (4), then adding dropwise the material obtained in step (5) and the third solution, whe...

Embodiment 3

[0057] (1) dissolving 180 g of VPEG-type monomer 4-hydroxybutyl vinyl polyoxyethylene ether with a number-average molecular weight of 3000 in 180 g of deionized water, and adjusting its temperature to 14 ° C to obtain the first solution;

[0058] (2) 20g of acrylic acid and 1.2g of mercaptoethanol are dissolved in 20g of deionized water, and then 8g of 30% sodium hydroxide solution is added for partial neutralization to obtain the second solution;

[0059] (3) 0.5g sodium hypophosphite is dissolved in 30g deionized water to obtain the third solution;

[0060] (4) drip 15g of the second solution into the first solution, and keep the temperature at 14°C;

[0061] (5) adding acryloyloxyethyl phosphate 3g and phosphoric acid di(hydroxyethyl acrylate) 1.2g to the remaining second solution;

[0062] (6) 0.045g ferrous sulfate and 2.0g sodium persulfate are successively added in the material of step (4) gained, then dropwise the material of step (5) gained and the third solution, wh...

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Abstract

The invention discloses a cross-linking type low-sensitivity polycarboxylate water reducing agent and a preparation method thereof. The structural formula of the polycarboxylate water reducing agent is as shown in the specification. The polycarboxylate water reducing agent is synthesized by copolymerization of 4-hydroxybutyl vinyl polyethenoxy ether, unsaturated acid, unsaturated phosphomonoester and unsaturated phosphodiester, and has high water-reducing rate, high slump loss resistance, mud resistance and low dosage sensibility under the synergetic effect of various groups.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a cross-linked low-sensitivity polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the rapid increase in the amount of ether polycarboxylate superplasticizers and the continuous expansion of the scope of use, the adaptability of admixtures to concrete caused by factors such as differences in cement performance and mud in sand and gravel has been a problem for cement manufacturers, Technical difficulties for concrete construction units and admixture manufacturers. The adaptability of concrete and admixtures is mainly reflected in the poor workability of concrete mixtures, the large loss of slump over time, and the sensitivity of dosage. Scheme: (1) Add more slump-retaining agent, coagulant, thickener and other additives that can improve performance when compounding polycarboxylate ether water-reducing agent. Al...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F230/02C08F2/38C04B24/26C04B103/30
CPCC04B24/246C04B2103/302C08F2/38C08F283/065C08F220/06
Inventor 钟丽娜方云辉陈小路蒋卓君代柱端官梦芹
Owner KZJ NEW MATERIALS GROUP CO LTD
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