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A kind of cross-linked low-sensitivity polycarboxylate water reducer and preparation method thereof

A low-sensitivity, polycarboxylic acid technology, used in the field of building materials, can solve the problems of unimproved dosage sensitivity and water-reducing agent dosage sensitivity, and achieve excellent low-sensitivity performance, good anti-intercalation effect, and improved dispersion. sexual effect

Active Publication Date: 2018-10-16
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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  • A kind of cross-linked low-sensitivity polycarboxylate water reducer and preparation method thereof
  • A kind of cross-linked low-sensitivity polycarboxylate water reducer and preparation method thereof
  • A kind of cross-linked low-sensitivity polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0044] (2) 26 g of acrylic acid and 1.5 g of mercaptopropionic acid were dissolved in 20 g of deionized water, and then 10 g of 30% potassium hydroxide solution was added for partial neutralization to obtain a second solution;

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

[0046] (4) Add 22g of the second solution dropwise to 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 were added to the remaining second solution;

[0048] (6) 0.05g ferrous sulfate and 2.5g hydrogen peroxide (30%) are joined in the material of step (4) gained successively, then the material ...

Embodiment 2

[0050] (1) 180 g of VPEG-type monomer 4-hydroxybutyl vinyl polyoxyethylene ether with a number average molecular weight of 2400 was dissolved in 180 g of deionized water, and the temperature was adjusted to 15° C. to obtain the first solution;

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

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

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

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

[0055] (6) 0.055g ferrous sulfate and 2.5g hydrogen peroxide (30%) are joined in the material of step (4) gained successively, then the material of step (5) gained and the 3rd solutio...

Embodiment 3

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

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

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

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

[0061] (5) 3 g of acryloyloxyethyl phosphate and 1.2 g of di(hydroxyethyl acrylate) phosphate were added to the remaining second solution;

[0062] (6) 0.045g ferrous sulfate and 2.0g sodium persulfate are added to the material obtained in step (4) successively, and then the material obtained in step (5) and ...

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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 use 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 always plagued cement manufacturers, Technical problems for concrete construction units and admixture manufacturers. The adaptability of concrete and admixtures is mainly reflected in the sometimes poor workability of the concrete mixture, the large loss of slump over time, and the sensitivity of the dosage. In order to solve the slump retention and workability, the following two methods are generally used: Solution: (1) Add more slump retaining agents, coagulants, thickeners ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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