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Method for preparing defoamer for cement mortar containing rubber emulsion

A technology of silicone defoamer and precipitation method, which is applied in the field of anti-corrosion and waterproofing of buildings, can solve the problems of slow defoaming and unsatisfactory defoaming, reduce the amount of bubbles produced, increase the speed of defoaming, and strengthen the defoaming and breaking The effect of bubble ability

Active Publication Date: 2012-06-13
DALIAN RES & DESIGN INST OF CHEM IND
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Problems solved by technology

Many domestic companies still have the problem of unsatisfactory defoaming in the production of silicone defoamers. When used in cement mortar containing rubber emulsion, defoaming is slow due to the effect of surfactants in the original system.

Method used

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  • Method for preparing defoamer for cement mortar containing rubber emulsion

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Embodiment Construction

[0005] The descriptions and diagrams below are exemplary embodiments of the present invention, but are not limited to these several variants.

[0006] The first part is to make silicone paste, that is, the main raw material composition includes dimethyl silicone oil, hydroxyl silicone oil, polyether silicone oil, and precipitated silica. The above parts by weight are 10 parts, 2 parts, 3 parts, 1-5 When configuring, three kinds of silicone oils and precipitated silica are made into silicone paste at 140-200°C through a three-roll mill. The second part is to add silicone paste and emulsifier (Tween 80: 1-3 parts, Siben 60: 1-3 parts and OP4: 1 part) in the stirring tank, at a temperature of 80 ° C, add 30-50 parts of water while stirring , Stir evenly for half an hour to make a uniform emulsion, which is the silicone defoamer. Among them, the viscosity of methyl silicone oil is 0.5-1 Pas, the viscosity of hydroxy silicone oil is 2-3 Pas, and the viscosity of polyether silicone...

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Abstract

The invention relates to an organic silicon defoamer. The organic silicon defoamer comprises the following main materials in part by weight: 10 parts of dimethicone, 2 parts of hydroxyl silicone oil, 3 parts of polyether silicone oil and 1 to 5 parts of precipitated silicon dioxide. The method comprises the following steps of: preparing three kinds of silicone oil and the precipitated silicon dioxide by a three-roller grinding machine at the temperature of between 140 and 200 DEG C to obtain silicon paste; and adding the silicon paste and an emulsifier (1 to 3 parts of Tween 80, 1 to 3 parts of spunray and 1 part of spandex (OP)) into a stirring kettle, adding 30 to 50 parts of water while stirring, and stirring uniformly for half an hour to prepare uniform emulsion serving as the organicsilicon defoamer. The invention has the advantages that the organic silicon defoamer can be used for the preparation and using process of the cement mortar which is used for construction and containsthe rubber emulsion, has high defoaming and foam breaking capacity, can improve the breaking speed of air bubbles and reduce the generation quantity of the air bubbles, and has high compatibility andstability.

Description

technical field [0001] The invention relates to anticorrosion and waterproofing of buildings (structures). The preparation and use of cement mortar containing rubber emulsion requires effective defoaming. Background technique [0002] Silicone-based defoamers are an ideal defoamer in defoaming systems, because they are insoluble in water and difficult to emulsify, so problems such as delamination may be encountered during use. The most famous of this type of defoamer is the German BYK company, which produces a variety of silicone defoamers, but the price is very high. Many domestic enterprises still have the problem of unsatisfactory defoaming in the production of silicone defoamers. When used in cement mortar containing rubber emulsion, the defoaming is slow due to the effect of surfactants in the original system. Contents of the invention [0003] The invention provides a method for preparing a defoamer for cement mortar containing rubber emulsion [0004] The producti...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B103/50
Inventor 王永飞赵晓舒
Owner DALIAN RES & DESIGN INST OF CHEM IND
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