Silyl ether-terminated polyether, preparation method thereof and high-efficiency mud-resistant water reducing agent

A technology of polyether and silicon ether, which is applied in the field of high-efficiency mud-resistant superplasticizers, can solve problems such as poor slump retention and reduced water-reducing rate of superplasticizers, and achieve improved slump retention performance, improved mud resistance, and reduced penetration Effect

Active Publication Date: 2020-06-16
安徽海螺材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Now the third generation of water reducer is polycarboxylate water reducer, which is usually synthesized by HPEG, VPEG and acrylic acid at room temperature to higher temperature and redox system A type of high-performance water reducer, but one end of the PEG long chain is a hydroxyl structure, the PEG chain as a whole has good water solubility, and is easy to penetrate into the soil voids, resulting in a decrease in the initial water reduction rate of the water reducer and a later collapse. poor sex

Method used

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  • Silyl ether-terminated polyether, preparation method thereof and high-efficiency mud-resistant water reducing agent
  • Silyl ether-terminated polyether, preparation method thereof and high-efficiency mud-resistant water reducing agent
  • Silyl ether-terminated polyether, preparation method thereof and high-efficiency mud-resistant water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of preparation method of the polyether end-capping of silicon ether, comprises the following steps:

[0042] 1) Methallyl polyoxyethylene ether (HPEG) is measured by the national standard hydroxyl value measurement method to measure the molar amount of hydroxyl groups per 100 grams of the sample. Oxyethylene ether (HPEG) was added to acetonitrile with 5 times the mass of HPEG, and dissolved;

[0043] 2) Add imidazole which is 1.3 times the amount of hydroxyl substances contained in methallyl polyoxyethylene ether and stir for 30 minutes until fully dissolved;

[0044] 3) At 2°C, add tert-butyldiphenylsilyl trifluoromethanesulfonate with 1.2 times the amount of the hydroxyl substance in 3 separate additions, the same amount is added for three times, with an interval of 10 minutes between each addition. After the addition is completed, react at room temperature for 20 hours. That is, the polyether terminated with silicon ether was spin-dried for later use.

Embodiment 2

[0046] A high-efficiency mud-resistant water reducer, prepared by using the silicon ether-terminated polyether prepared in the above embodiment 1, specifically:

[0047] 1) Under the condition of 25°C, take 0.08 mol of uncapped HPEG and 0.02 mol of silyl ether-capped HPEG prepared in Example 1, dissolve them in water 1.2 times the total mass of uncapped HPEG and silyl ether-capped HPEG, and stir to make After the bottom solution is dissolved and clarified, add 2.0% of the total mass of hydrogen peroxide of unblocked HPEG and silicon ether-capped HPEG and ferrous sulfate of 0.01% of the total mass of uncapped HPEG and silicon ether-capped HPEG. After dissolving completely, the above solution as a primer;

[0048] 2) Preparation of material A and material B: Material A is 0.35 moL of acrylic acid dissolved in water that is 4 times the mass of acrylic acid, and material B is mercaptopropionic acid and 0.8% of the total mass of unblocked HPEG and silicon ether-capped HPEG. 0.4% o...

Embodiment 3

[0051] A high-efficiency mud-resistant water reducer, prepared by using the above-mentioned silicone ether-terminated polyether, specifically:

[0052] Change 0.08moL unblocked EPEG and 0.02moL silyl ether-capped EPEG prepared in Example 1 into 0.05moL uncapped EPEG and 0.05moL silyl ether-capped EPEG prepared in Example 1; others are the same as in the examples 2. A 50% replacement synthetic water reducer mother liquor was prepared.

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Abstract

The invention provides silyl ether-terminated polyether, a preparation method thereof and a high-efficiency mud-resistant water reducing agent. The preparation method comprises the following steps: 1)under a stirring condition, adding a polyether raw material into an organic solvent, and dissolving; 2) adding imidazole, stirring and dissolving; and 3) adding a silyl ether protective agent, and reacting to obtain the silyl ether-terminated polyether. Compared with the prior art, the silyl ether-terminated polyether has advantages that silyl ether substances are used for terminating hydroxyl groups of methyl allyl polyoxyethylene ether HPEG, 4-hydroxybutyl vinyl polyoxyethylene ether VPEG and the like so that the whole PEG chain terminal has a certain hydrophobicity, and the terminal grouphas a large volume so as to effectively prevent the PEG chain from penetrating into the soil, such that the excellent mud resistance is represented.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a silicon ether-terminated polyether, a preparation method thereof, and a high-efficiency mud-resistant water reducer. Background technique [0002] At present, the concrete industry uses machine-made sand, which has a large mud content, which affects the working performance of the water reducing agent, including the initial water reducing rate and the collapse retention over time. [0003] Now the third-generation water reducer is polycarboxylate water reducer, which is a kind of high-performance water reducer synthesized by HPEG, VPEG and acrylic acid at room temperature to higher temperature and redox system, but one end of the PEG long chain is Hydroxyl structure, the PEG chain as a whole has good water solubility, and is easy to penetrate into the soil voids, resulting in a decrease in the initial water-reducing rate of the water-reducing agent, and poor slump ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/336C08F283/06C08F220/06C04B24/26C04B103/30
CPCC08G65/336C08F283/065C04B24/2694C04B2103/302C08F220/06Y02P20/55
Inventor 陶超超许庚友陈烽曾君司宏振宋南京
Owner 安徽海螺材料科技股份有限公司
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