Styrene-butadiene redispersible emulsion powder and preparation method thereof

A technology of redispersible latex powder and carboxylated styrene-butadiene emulsion, applied in the field of emulsion, can solve the problems of mutual repulsion, thickening, inability to prepare redispersible latex powder by spray drying, etc. Water loss properties, the effect of improving physical and chemical properties

Active Publication Date: 2018-01-09
YOUNGWOO CHEMTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The styrene-butadiene emulsion is polymerized from styrene and butadiene, and neither of these two substances has a hydrophilic group. As a result, after the styrene-butadiene emulsion is mixed with a highly hydrophilic protective colloid, there is mutual repulsion and a sharp increase. Thick phenomenon, unable to prepare redispersible latex powder by normal spray drying

Method used

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  • Styrene-butadiene redispersible emulsion powder and preparation method thereof
  • Styrene-butadiene redispersible emulsion powder and preparation method thereof
  • Styrene-butadiene redispersible emulsion powder and preparation method thereof

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preparation example Construction

[0032] The present invention also provides a kind of preparation method of described redispersible latex powder, and this method comprises the following steps:

[0033] (1) preparing a mass percentage composition of 20% polyvinylpyrrolidone aqueous solution, a mass percentage composition of 20% polyvinyl alcohol aqueous solution, and a mass percentage composition of 10% pH regulator solution;

[0034] (2) Take the carboxylated styrene-butadiene emulsion in the reactor, and start stirring;

[0035] (3) Then, add the pH regulator solution, surfactant, polyvinylpyrrolidone aqueous solution, carboxylic acid, polyvinyl alcohol aqueous solution, and defoamer to the reaction kettle while stirring to obtain a mixture;

[0036] (4) The mixture in step (3) is spray-dried into powder, and the anti-caking agent is added at the same time to obtain the redispersible latex powder.

[0037] The styrene-butadiene redispersible latex powder of the present invention adopts the adding sequence o...

Embodiment 1

[0042] A kind of styrene-butadiene redispersible latex powder comprises the component of following mass percent: carboxylated styrene-butadiene emulsion 60%, nonylphenol polyoxyethylene ether 1.6%, polyvinylpyrrolidone 1%, citric acid 1.2%, polyvinyl alcohol ( The degree of alcoholysis is 88%, the degree of polymerization is 500) 5%, ammonia water 0.03%, organic silicon defoamer 0.4%, kaolin 6.5%, deionized water 24.27%.

[0043] The preparation method of this styrene-butadiene redispersible latex powder may further comprise the steps:

[0044] (1) Weighing 1% of the polyvinylpyrrolidone and dissolving it in 4% of deionized water is prepared into a 20% polyvinylpyrrolidone aqueous solution; weighing 5% of the polyvinyl alcohol and dissolving it in deionized water 20% of the polyvinyl alcohol solution was prepared as 20% by mass, and the 0.03% ammonia water was weighed and dissolved in 0.27% of deionized water to prepare a 10% ammonia solution by mass;

[0045] (2) Take the carb...

Embodiment 2

[0049] A kind of styrene-butadiene redispersible latex powder comprises the component of following mass percent: carboxylated styrene-butadiene emulsion 71.5%, nonylphenol polyoxyethylene ether 1.2%, polyvinylpyrrolidone 0.48%, citric acid 1%, polyvinyl alcohol ( The degree of alcoholysis is 88%, the degree of polymerization is 500) 3.5%, ammonia 0.02%, fatty acid ester defoamer 0.2%, white carbon black 2.5%, heavy calcium carbonate 3.5%, deionized water 16.1%.

[0050] The preparation method of this styrene-butadiene redispersible latex powder may further comprise the steps:

[0051] (1) Weigh 0.48% of the polyvinylpyrrolidone and dissolve it in 1.92% of deionized water, and prepare it into an aqueous solution of polyvinylpyrrolidone with a mass percentage of 20%; weigh 3.5% of the polyvinyl alcohol and dissolve it in deionized water 14% of the polyvinyl alcohol solution was prepared as a 20% aqueous polyvinyl alcohol solution by mass, and the 0.02% ammonia water was weighed ...

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Abstract

The invention discloses styrene-butadiene redispersible emulsion powder and a preparation method thereof. The emulsion powder is prepared from the following components in parts by mass, 60-71.5% of carboxy styrene-butadiene latex, 1.2-1.6% of surfactant, 0.48-1% of polyvinyl pyrrolidone, 0.7-1.2% of carboxylic acid, 3.5-5% of polyvinyl alcohol, 0.05-0.1% of pH regulator, 0.2-0.4% of defoamer, 6-6.5% of anti-caking agent, and the balance of deionized water. The preparation method comprises the steps of adding the components in sequence, and adding the anti-caking agent while drying so as to prevent adhesion of the redispersible emulsion powder and effectively prevent the reduction of the performance of the redispersible emulsion powder due to spray drying. Through synergism and scientific compatibility of the components, the styrene-butadiene redispersible emulsion powder has a remarkable water reducing effect in cement mortar, adhesive strength between cement mortar and a base materialis improved, and the water resistance and flexibility of cement mortar are improved.

Description

technical field [0001] The invention relates to an emulsion, in particular to a styrene-butadiene redispersible latex powder and a preparation method thereof. Background technique [0002] Redispersible latex powder is a polymer powder that can be redispersed in water to form a dispersion liquid after adding water, and has similar properties to the original emulsion. Generally, it is prepared by adding certain additives to polymer emulsion and then dehydrating by spray drying process. Redispersible latex powder is processed by spray drying of special polymer emulsion. Compared with conventional emulsions, redispersible latex powders can be dry-mixed with cement, aggregates and other materials to make one-component products that are easy to apply on the construction site, with low packaging and transportation costs, low environmental impact, and waterproof Antifreeze. [0003] Most of the existing redispersible latex powders are EVA type and acrylic type, and styrene-butad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L13/00C08L29/04C08L39/06C08K13/02C08K3/34C08K3/36C08K3/26C08J3/12
Inventor 任斌
Owner YOUNGWOO CHEMTECH
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