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A cross-linked low-sensitivity ester ether copolymerization polycarboxylate water reducer and its preparation method

A sensitive ester and cross-linking technology, which is applied in the field of building materials, can solve the problems of water reducing agent dosage sensitivity, dosage sensitivity has not been improved, etc., achieve good anti-intercalation effect, excellent low sensitivity performance, improve secretion water effect

Active Publication Date: 2018-09-07
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 cross-linked low-sensitivity ester ether copolymerization polycarboxylate water reducer and its preparation method
  • A cross-linked low-sensitivity ester ether copolymerization polycarboxylate water reducer and its preparation method
  • A cross-linked low-sensitivity ester ether copolymerization polycarboxylate water reducer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) 160 g of VPEG-type monomers with a number average molecular weight of 2000 were dissolved in 175 g of deionized water, and the temperature was adjusted to 15° C. to obtain the first solution;

[0045] (2) 25 g of acrylic acid and 1.4 g of mercaptopropionic acid were dissolved in 20 g of deionized water, and then 9.5 g of 30% potassium hydroxide solution was added for partial neutralization to obtain a second solution;

[0046] (3) 0.55g sodium formaldehyde sulfoxylate is dissolved in 30g deionized water to obtain the third solution;

[0047] (4) the MPEG type monomer that the number average molecular weight is 2400 is dissolved in deionized water to obtain 45g of the fourth solution with a concentration of 90%. The methacrylic acid (MAA) and polyethylene glycol in the above MPEG type monomer The acid-alcohol ratio of alcohol monomethyl ether (MPEG) is 2.5;

[0048] (5) Add 21g of the second solution dropwise to the first solution, and keep the temperature at 15°C; ...

Embodiment 2

[0052] (1) 140 g of VPEG-type monomers with a number average molecular weight of 2000 were dissolved in 174 g of deionized water, and the temperature was adjusted to 15° C. to obtain the first solution;

[0053] (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;

[0054] (3) 0.6gFF6 was dissolved in 30g deionized water to obtain the third solution;

[0055] (4) Dissolving the MPEG type monomer with the number average molecular weight of 2000 in deionized water to obtain 60 g of the fourth solution with a concentration of 90%, the methacrylic acid (MAA) and polyethylene glycol in the above MPEG type monomer The acid-alcohol ratio of alcohol monomethyl ether (MPEG) is 3.5;

[0056] (5) Add 20 g of the second solution dropwise to the first solution, and keep the temperature at 15°C;

[0057] (6) 3 g of 2-methacryloxyprop...

Embodiment 3

[0060] (1) Dissolving 100 g of a VPEG-type monomer with a number average molecular weight of 3000 in 170 g of deionized water, and adjusting its temperature to 14° C. to obtain the first solution;

[0061] (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;

[0062] (3) 0.5g sodium hypophosphite is dissolved in 30g deionized water to obtain the third solution;

[0063] (4) Dissolving the MPEG type monomer with the number average molecular weight of 2000 in deionized water to obtain 100 g of the fourth solution with a concentration of 90%, the methacrylic acid (MAA) and polyethylene glycol in the above MPEG type monomer The acid-alcohol ratio of alcohol monomethyl ether (MPEG) is 2.5;

[0064] (5) Add 15 g of the second solution dropwise to the first solution, and keep the temperature at 14°C;

[0065] (6) Add 2.5 g of ac...

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Abstract

The invention discloses a crosslinking-type low-sensitivity ester-ether copolymerized polycarboxylate superplasticizer and a preparation method thereof. The crosslinking-type low-sensitivity ester-ether copolymerized polycarboxylate superplasticizer has the number-average molecular weight of 10000-100000 and has a structural formula as shown in the specification. Under the synergistic effect of various groups, the polycarboxylate superplasticizer formed by copolymerization of 4-hydroxybutyl-vinyl polyoxyethylene ether, unsaturated acid, unsaturated phosphomonoester and unsaturated phosphodiester has the advantages of high water-reducing rate, high slump loss resistance, high peaceability, mud-resistant property and low dosage sensibility.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a cross-linked low-sensitivity ester-ether copolymerized 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 agent...

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
CPCC04B24/246C04B2103/302C08F2/38C08F283/065C08F220/06C08F230/02
Inventor 钟丽娜方云辉蒋卓君陈小路官梦芹
Owner KZJ NEW MATERIALS GROUP CO LTD
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