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Water-resistant re-dispersible latex powder

A technology of redispersible latex powder and water resistance, applied in the field of building materials, can solve the problems of poor water resistance of redispersible latex powder, and achieve the effect of excellent water resistance and good dispersibility

Inactive Publication Date: 2015-11-25
北京博润佳科技有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem of poor water resistance of redispersible latex powder, provide a kind of water resistant redispersible latex powder, and promote its application in dry powder construction mortar and special waterproof materials, etc.

Method used

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Embodiment Construction

[0019] Products and percentages adopted in each embodiment of the present invention are shown in the following table:

[0020]

[0021] Preparation method: Heat the protective colloid and water in the ratio of 36:350 in a reaction kettle to prepare glue, and then mix the polymer modified emulsion and the adjusted glue evenly. Then add functional admixtures while stirring vigorously to form a uniform emulsion, transport the emulsion to the drying equipment for spray drying, high-speed centrifugal atomization into micro droplets, add anti-caking agent to prevent sticking, and then cool down the rubber powder particles , separation.

[0022] Use the spray drying test machine to carry out spray drying, control the hot air inlet temperature to be 120-160°C, and the outlet temperature to be 60-90°C. When the inlet air temperature reaches the set temperature, start feeding. The feeding speed must be gradually adjusted from low to high, and the flow rate should be adjusted properl...

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Abstract

The invention relates to water-resistant re-dispersible latex powder, and belongs to the technical field of building materials. The water-resistant re-dispersible latex powder comprises, by mass, 75-85% of polymer modified latex, 5-11% of protective colloid, 10-16% of anti-caking agents and 0-5% of functional additives. A preparation method of the washable re-dispersible latex powder includes the steps that the protective colloid powder and water are heated inside a reaction kettle according to the proportion of 36:350 to form adhesive through blending; then the adhesive is mixed with the polymer modified latex, and the functional additives are added into the mixture to be stirred to form uniform latex; then the latex is conveyed into drying equipment and atomized through a high-speed centrifugal atomizer, part of anti-caking agents are added to prevent adhesion, and the water-resistant re-dispersible latex powder finished product is obtained through temperature decreasing and separating. By the adoption of the method, the water-resistant performance of the re-dispersible latex powder can be effectively improved, the requirements for high performance and environmental friendliness of building mortar are met, and application of the latex powder to dry powder building mortar and special waterproof materials is promoted.

Description

technical field [0001] The invention relates to a water-resistant redispersible latex powder, which belongs to the technical field of building materials. Background technique [0002] Redispersible latex powder is a powder obtained by drying polymer emulsion by spray drying or other drying methods, which can be redispersed in water and form a polymer emulsion with the same or similar properties as the original emulsion. [0003] At present, redispersible latex powder is widely used in the fields of concrete and mortar modification due to its good stability, long storage period, simple packaging, convenient transportation, and can be mixed with cement, gypsum and other raw materials at will. The water resistance of redispersible latex powder used as a building material has also attracted more and more attention. Conventional redispersible latex powder is based on vinyl acetate-ethylene copolymer emulsion, adding commonly used protective colloids in the production and spray d...

Claims

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Application Information

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IPC IPC(8): C08L31/04C08L29/04C08L33/02C08L3/02C08L1/28C08K3/26C08K3/34C08K3/36C04B24/24
Inventor 许文英董慧艳梁海波张艳凤
Owner 北京博润佳科技有限公司
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