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Styrene-acrylic waterproof latex and preparation method thereof

A waterproof emulsion, styrene-acrylic technology, applied in the coating and other directions, can solve the problems of difficulty in balancing tensile strength and elongation at break, poor affinity between polymers and cement, microstructure defects, etc., to achieve moderate consistency, The effect of stable product quality and simple preparation process

Pending Publication Date: 2019-01-08
北京宝辰联合科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After years of research and development and improvement, although polymer cement waterproof coatings have achieved gratifying results in product performance and quality, there are still many things that can be improved.
For example, the emulsion polymer is not environmentally friendly, has poor compatibility with cement, and has poor dispersion ability after mixing with cement and is easy to settle; the polymer has poor affinity with cement, and organic and inorganic phase separation occurs after the coating film is cured, and there are microstructural defects
At the same time, the poly-ash ratio recommended by commercially available polymer cement waterproof coating formulations is too high, resulting in high cost and difficulty in balancing the relationship between tensile strength and elongation at break

Method used

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  • Styrene-acrylic waterproof latex and preparation method thereof

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Effect test

Embodiment 1

[0029] A styrene-acrylic waterproof emulsion comprises the following raw materials in parts by weight: 25 parts of styrene, 15 parts of methyl methacrylate, 15 parts of methyl acrylate, 45 parts of butyl acrylate, 0.6 part of acrylic acid, 1.5 parts of acrylamide, dodecane 2 parts of sodium base sulfate, 1.0 part of sodium persulfate, and 0.5 parts of buffering agent sodium bicarbonate.

[0030] The preparation method of described styrene-acrylic waterproof emulsion comprises the following steps:

[0031] (1) Stir and mix sodium lauryl sulfate and deionized water at room temperature (25°C) at a speed of 250rpm, and then add the above-mentioned parts by weight of styrene, methyl methacrylate, methyl acrylate, and butyl acrylate , acrylic acid, acrylamide with a total amount of 65%, and simultaneously open the agitator to stir at a speed of 250 rpm to obtain a pre-emulsion;

[0032] (2) Add buffer and deionized water to the reactor, stir and heat up to 80°C, then add 15% of the...

Embodiment 2

[0037] A styrene-acrylic waterproof emulsion comprises the following raw materials in parts by weight: 30 parts of styrene, 18 parts of methyl methacrylate, 20 parts of methyl acrylate, 50 parts of butyl acrylate, 0.8 part of acrylic acid, 2.0 parts of acrylamide, dodecane 3 parts of diphenyl ether disulfonic acid sodium salt, 1.5 parts of potassium persulfate, and 0.8 parts of buffering agent sodium bicarbonate.

[0038] The preparation method of described styrene-acrylic waterproof emulsion comprises the following steps:

[0039] (1) Stir and mix dodecyl diphenyl ether disulfonic acid sodium salt and deionized water at a speed of 260rpm at room temperature (25°C), and then add the above-mentioned parts by weight of styrene, methyl methacrylate, acrylic acid Methyl ester, butyl acrylate, acrylic acid, and acrylamide with a total amount of 70% are simultaneously turned on and stirred at a speed of 260 rpm to obtain a pre-emulsion;

[0040] (2) Add buffer and deionized water to ...

Embodiment 3

[0045] A styrene-acrylic waterproof emulsion comprises the following raw materials in parts by weight: 20 parts of styrene, 10 parts of methyl methacrylate, 12 parts of methyl acrylate, 40 parts of butyl acrylate, 0.2 part of acrylic acid, 1.0 part of acrylamide, alkylphenol 1.0 parts of polyoxyethylene ether, 0.5 parts of ammonium persulfate, and 0.2 parts of buffering agent sodium bicarbonate.

[0046] The preparation method of described styrene-acrylic waterproof emulsion comprises the following steps:

[0047] (1) At room temperature (25°C), stir and mix the alkylphenol polyoxyethylene ether and deionized water at a speed of 200rpm, and then add the above-mentioned parts by weight of styrene, methyl methacrylate, methyl acrylate, and butyl acrylate Ester, acrylic acid, acrylamide with a total amount of 60%, and simultaneously turn on the stirrer to stir at a speed of 200rpm to obtain a pre-emulsion;

[0048] (2) Add buffer and deionized water to the reaction kettle, stir ...

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Abstract

The invention discloses a styrene-acrylic waterproof latex and a preparation method thereof. The latex comprises the following raw materials in parts by weight: 20-30 parts of styrene, 10-18 parts ofmethyl methacrylate, 12-20 parts of methyl acrylate, 40-50 parts of butyl acrylate, 0.2-0.8 parts of acrylic acid, 1.0-2.0 parts of acrylamide, 1-3 parts of an emulsifier, 0.5-1.5 parts of an evocating agent and 0.2-0.8 parts of a buffering agent. The waterproof latex provided by the invention has low coagulating rate and moderate viscosity, thereby effectively solving the compatibility problem between the styrene-acrylic waterproof latex and powder materials such as cement, and also solving the difficult problem of poor compatibility between a macromolecule polymer and the cement with a filmformed on the surface. The latex has super flexibility, the tensile strength and the elongation at break are much higher than the requirements in the national standard and better than the waterproof latex sold with good performance on the market, and the product quality is stable, so that the bond strength between the film and the base is ensured to be high and the performances in water resistance, alkali resistance and weather resistance are high in practical application.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a styrene-acrylic waterproof emulsion and a preparation method thereof. technical background [0002] JS waterproof coating is composed of organic materials and inorganic materials. It has the advantages of good flexibility of organic materials and strong rigidity of inorganic materials. It has the characteristics of high elasticity, high elongation, durability and water resistance. Since the resin emulsion for paint is a water-based system, the product is non-toxic and pollution-free, clean and environmentally friendly, safe in transportation and construction, and has incomparable advantages compared with other waterproof materials. [0003] At present, the commonly used resin emulsions for JS waterproof coatings on the market mainly include polyacrylate emulsions, polyvinyl acetate-ethylene emulsions, and polystyrene-acrylate emulsions. In addition, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F212/08C08F220/14C08F220/06C08F220/56C09D133/08
CPCC08F220/18C08F220/1804C09D133/08C08F212/08C08F220/14C08F220/06C08F220/56
Inventor 田力
Owner 北京宝辰联合科技股份有限公司
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