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A kind of concrete defoamer and its synthesis method

A defoaming agent and concrete technology, applied in the field of concrete admixtures, can solve the problems of insignificant defoaming effect, changing the composition of defoaming agent, good foam suppressing effect, etc. The bubble effect is remarkable

Active Publication Date: 2021-06-29
中建西部建设北方有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the silicone oil with larger molecular weight is insoluble in the surfactant solution, while the small molecule silicone oil is easily solubilized by surfactant molecules, thus changing the composition of the defoamer and weakening the defoaming performance
This kind of defoamer has strong anti-foaming ability, and at the same time it also greatly enhances its foam-breaking effect, but there is a big problem with insoluble, and the use conditions are relatively harsh
[0009] The fourth type of defoamer is polyether modified silicone oil defoamer, which strives to integrate the advantages of polyether and silicone, and introduces the polyether segment into the silicone oil segment, which has stronger defoaming and antifoaming properties, but In the actual product, due to the structural characteristics of the main defoaming component, either the defoaming property is good but the foam suppressing property is limited, or the foam suppressing effect is good but the defoaming effect is not significant, and it is difficult to produce defoaming and foam suppressing effect at the same time

Method used

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  • A kind of concrete defoamer and its synthesis method
  • A kind of concrete defoamer and its synthesis method
  • A kind of concrete defoamer and its synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step 1: Vacuum distill siloxane with low hydrogen content (hydrogen content 0.12%), allyl alcohol polyoxyethylene polyoxypropylene ether, and glucose oxyethyl methacrylate until the water content is below 0.1% for later use ;

[0045] Step 2: In the there-necked flask equipped with mechanical stirring, thermometer, reflux condenser, add the siloxane of 1mol low hydrogen content, solvent isopropanol, polymerization inhibitor hydroquinone, wherein the quality of solvent isopropanol is relatively When the mass ratio of the total reactants is 30% to 40%, the mass ratio of the polymerization inhibitor hydroquinone relative to the total reactants is 0.15%; when the temperature is raised to 50°C, 20 μg g -1 Chloroplatinic acid catalyst, then heat up to 85-95°C, add 1.20mol of allyl alcohol polyoxyethylene polyoxypropylene ether and glucose oxyethyl methacrylate mixture dropwise at a constant speed under stirring, dropwise for 1 hour, and dropwise Continue to react for 5h; whe...

Embodiment 2

[0049] Step 1: Vacuum distill low-hydrogen siloxane (hydrogen content 0.16%), allyl alcohol polyoxyethylene polyoxypropylene ether, and glucose oxyethyl methacrylate until the water content is below 0.1% for later use ;

[0050] Step 2: In the there-necked flask equipped with mechanical stirring, thermometer, reflux condenser, add the siloxane of 1mol low hydrogen content, solvent isopropanol, polymerization inhibitor hydroquinone, wherein the quality of solvent isopropanol is relatively The mass proportion of the total reactants is 30% to 40%, and the mass proportion of the polymerization inhibitor hydroquinone relative to the total reactants is 0.15%; when the temperature is raised to 50°C, 30 μg g -1 Chloroplatinic acid catalyst, then heat up to 90°C, add 1.20mol of allyl alcohol polyoxyethylene polyoxypropylene ether and glucose oxyethyl methacrylate mixture dropwise at a constant speed under stirring, dropwise for 1 hour, continue the reaction after dropping 5h; where n ...

Embodiment 3

[0054] Step 1: Vacuum distill low-hydrogen siloxane (hydrogen content 0.16%), allyl alcohol polyoxyethylene polyoxypropylene ether, and glucose oxyethyl methacrylate until the water content is below 0.1% for later use ;

[0055] Step 2: In the there-necked flask equipped with mechanical stirring, thermometer, reflux condenser, add the siloxane of 1mol low hydrogen content, solvent isopropanol, polymerization inhibitor hydroquinone, wherein the quality of solvent isopropanol is relatively The mass proportion of the total reactants is 30% to 40%, and the mass proportion of the polymerization inhibitor hydroquinone relative to the total reactants is 0.15%; when the temperature is raised to 50°C, 30 μg g -1 Chloroplatinic acid catalyst, then raise the temperature to 90°C, first add 0.6mol allyl alcohol polyoxyethylene polyoxypropylene ether dropwise at a constant speed under stirring, then add 0.6mol glucose oxyethyl methacrylate dropwise at a constant speed, and continue the reac...

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Abstract

The invention proposes a new type of concrete defoamer and its synthesis method. The obtained concrete defoamer is polyether, sugar-containing acrylate and low hydrogen-containing siloxane block polymer, and the hydrophilic polyether group And the sugar-containing group endows the polymer with water solubility, and the hydrophobic polysiloxane and acrylate segment endow the polymer with hydrophobicity. With a certain proportion of the two, a nonionic surfactant is synthesized, which is easy to dissolve, emulsify, and resist Acid-base, good compatibility with other concrete admixtures, performance in the field of concrete is obviously better than other defoamers.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a concrete defoamer and a synthesis method thereof. Background technique [0002] Concrete use is growing at a much higher rate today than it was 40 years ago. It is estimated that the annual consumption of concrete in the world is 11 billion tons, making it the most widely used building material today. Concrete is a structural material. It is not as strong as steel, nor as rigid and tough as steel, but it is the cheapest material (the main components of concrete: aggregate, water, Portland cement are relatively low in cost, and It can be easily obtained in most parts of the world), the strongest plasticity (concrete is easy to make concrete members of various sizes and sizes), and the best water resistance, making it a leader in building materials. [0003] Concrete is a multiphase material consisting of solid, liquid and gas. Under mechanical stirring, the solid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/46C04B24/42C04B103/50
CPCC04B24/42C04B2103/50C08G77/46
Inventor 罗作球王敏张凯峰刘磊孟刚吴超任慧超王继博刘行宇邰炜
Owner 中建西部建设北方有限公司