Self-emulsifying concrete defoamer and preparation method thereof

A technology for concrete and defoaming agent, applied in the field of self-emulsifying concrete defoaming agent and its preparation, can solve the problems of poor elimination ability of dense foam, poor acid and alkali resistance, and high cost, achieve excellent self-emulsifying performance and improve working performance , The effect of strong acid and alkali resistance

Active Publication Date: 2016-02-03
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of defoamer is cheap, but it has poor ability to eliminate dense foam, poor acid and alkali resistance, and poor use effect in concrete strong alkali environment; silicone defoamer is a combination of insoluble, chemical stability and physical stability. , physiological inertia and good high and low temperature performance, especially under harsh conditions, can also achieve satisfactory results
However, its emulsification problem is complicated. If the emulsification is not complete, the demulsification will seri

Method used

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  • Self-emulsifying concrete defoamer and preparation method thereof
  • Self-emulsifying concrete defoamer and preparation method thereof
  • Self-emulsifying concrete defoamer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A self-emulsifying concrete defoamer, prepared by the following method:

[0027] (1) Vacuum distilling siloxane with low hydrogen content (0.18% hydrogen content) and glucose oxyethyl acrylate until the water content is below 0.1% for subsequent use;

[0028] (2) In a round bottom flask equipped with a thermometer, a stirrer, a reflux condenser and a nitrogen purge device, 1.5mol glucose oxyethyl acrylate is added to the reaction device, stirred, 0.6mol xylene is added, and Nitrogen is purged to remove the oxygen in the reaction system, the temperature is raised to 90° C., and 59 ppm of chloroplatinic acid in isopropanol is added as a catalyst;

[0029] (3) Add 1.45 mol of siloxane with low hydrogen content dropwise. After the reaction, vacuum distillation removes low boilers and solvents, obtained from defoamer for emulsified concrete, denoted as xp-1.

Embodiment 2

[0031] A self-emulsifying concrete defoamer, prepared by the following method:

[0032] (1) Vacuum distilling siloxane with low hydrogen content (0.18% hydrogen content) and glucose oxyethyl acrylate until the water content is below 0.1% for subsequent use;

[0033] (2) In a round bottom flask equipped with a thermometer, a stirrer, a reflux condenser and a nitrogen purge device, 1.5mol glucose oxyethyl acrylate is added to the reaction device, stirred, 0.6mol xylene is added, and Nitrogen gas is purged to remove the oxygen in the reaction system, the temperature is raised to 80° C., and the ethanol solution of 45 ppm of chloroplatinic acid is added as a catalyst;

[0034] (3) Add 1.45 mol of siloxane with low hydrogen content dropwise. After the reaction, vacuum distillation removes low boilers and solvents. It is obtained from the defoamer for emulsified concrete and is denoted as xp-2.

Embodiment 3

[0036] A self-emulsifying concrete defoamer, prepared by the following method:

[0037] (1) Vacuum distilling siloxane with low hydrogen content (0.18% hydrogen content) and glucose oxyethyl methacrylate until the water content is below 0.1% for subsequent use;

[0038] (2) In the round-bottomed flask equipped with thermometer, stirrer, reflux condenser and nitrogen purging device, 1.5mol glucose oxyethyl methacrylate is added in the reaction unit, stir, add 0.6mol toluene, And purging with nitrogen to remove the oxygen in the reaction system, raising the temperature to 110 ° C, adding 39 ppm of chloroplatinic acid in isopropanol as a catalyst;

[0039] (3) Add 1.5 mol of siloxane with low hydrogen content dropwise. After the reaction, vacuum distillation removes low boilers and solvents, obtained from defoamer for emulsified concrete, denoted as xp-3.

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Abstract

The invention belongs to the field of concrete admixtures and particularly relates to a self-emulsifying concrete defoamer and a preparation method thereof. The self-emulsifying concrete defoamer is prepared by addition reaction of siloxane or siloxane derivatives with low hydrogen content and glycosyl-containing acrylate compounds or derivatives thereof. The structural formula of the self-emulsifying concrete defoamer is shown in the formula I, wherein a is an integer of 8-20, b is an integer of 0-20, c is an integer of 1-15, R1 is -H or -CH3, and R2 is -H, -OH or -CH2OH. The self-emulsifying concrete defoamer provided by the invention has excellent self-emulsifying performance, good compatibility with other additives for concrete and strong acid and alkali resistant capabilities; when the self-emulsifying concrete defoamer is applied to concrete, large bubbles of which the diameter is greater than 50nm in the concrete can be eliminated; and meanwhile, micro-bubbles capable of obviously improving the concrete performance are introduced, so that the workability and anti-freeze durability of the concrete can be effectively improved.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a self-emulsifying concrete defoamer and a preparation method thereof. Background technique [0002] Concrete is a multi-phase material, composed of three phases: solid, liquid and gas. A proper amount of small and independently distributed air bubbles in fresh concrete are similar to balls, which have a wetting and dispersing effect, which can improve the workability of concrete and effectively reduce the fresh concrete. Bleeding, to avoid segregation, and in the hardened concrete, tiny independent air bubbles make the capillary inside the hardened concrete small, tortuous, scattered, and the permeation channels are reduced, which is beneficial to improve the frost resistance, compactness and impermeability of the concrete; However, too many air bubbles in concrete will affect the quality of the project. More importantly, it reflects the potential risk of the project quality. ...

Claims

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Application Information

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IPC IPC(8): C04B24/40
Inventor 赵日煦邢菊香杨文毕耀郑广军李兴王少峰汪金文熊龙周辉
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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