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Zero-VOC (volatile organic compound) cement-based water-proof material copolymer emulsion and preparation method thereof

A waterproof material and polymer emulsion technology, which is applied in the field of waterproof coatings, can solve the problems of weak anti-ultraviolet ability, unfavorable industrial production, and high cost of styrene-butadiene latex, and achieve excellent rheological properties, good emulsification effect, and low water absorption of the coating film Effect

Pending Publication Date: 2019-03-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer cement waterproof coatings formulated with traditional VAE emulsions usually have the following deficiencies: large liquid-to-powder ratio and low elasticity, the coating film softens significantly after long-term immersion in water, the strength decreases, the anti-ultraviolet ability is not strong, and the weather resistance is poor. After two or three years, it becomes obviously hardened and the elongation rate decreases
However, styrene-butadiene latex is easy to float in the process of mixing with cement, and the cost of styrene-butadiene latex is relatively high; vacuum degassing is used in the post-treatment process. This treatment method consumes a lot of energy, takes a long time to degas, and has high production costs. Complicated, not conducive to industrial production

Method used

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  • Zero-VOC (volatile organic compound) cement-based water-proof material copolymer emulsion and preparation method thereof
  • Zero-VOC (volatile organic compound) cement-based water-proof material copolymer emulsion and preparation method thereof
  • Zero-VOC (volatile organic compound) cement-based water-proof material copolymer emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Preparation of component A zero VOC polymer emulsion:

[0056] 1.1 Preparation of pre-emulsion: add 30 parts of deionized water, 0.5 parts of BASFSLS103 anionic emulsifier, 0.5 parts of German Ham TX-10 non-ionic emulsifier to the emulsification tank in terms of mass fraction, and then use a peristaltic pump to add 30 parts Methyl acrylate, 30 parts of n-butyl acrylate, 10 parts of styrene, 0.1 part of acrylic acid and 0.1 part of methacrylic functional monomer are added to the emulsification tank, and the stirring blade is turned on for high-speed shear emulsification. The speed of the stirring blade is 300rpm, and the stirring The time is 20min.

[0057] 1.2 Emulsion polymerization: In terms of mass fraction, add 60 parts of deionized water, 0.5 parts of BASF SLS103 anionic emulsifier, and 0.5 parts of German Ham TX-10 non-reactor into a reactor equipped with a stirring blade, condenser and peristaltic pump feeding device. Ionic emulsifier, 0.1 part of sodium carbonat...

Embodiment 2

[0062] (1) Preparation of component A zero VOC polymer emulsion:

[0063] 1.1 Preparation of pre-emulsion: add 33 parts of deionized water, 0.7 parts of Dow DOWFAX 2A1 anionic emulsifier, 0.3 parts of BASF EUMULGIN CO 40 non-ionic emulsifier to the emulsification tank, and then use a peristaltic pump to add 60 parts of n-butyl acrylate , 20 parts of styrene and 0.5 parts of acrylamide functional monomer are added to the emulsification tank, and at the same time the stirring blade is turned on for high-speed shear emulsification, the speed of the stirring blade is 350rpm, and the stirring time is 25min.

[0064] 1.2 Emulsion polymerization: Add 63 parts of deionized water, 1.0 part of Dow DOWFAX 2A1 anionic emulsifier, 0.7 part of BASF EUMULGIN CO 40 non-ionic emulsifier, and 0.2 Parts of sodium bicarbonate buffer, 0.02 parts of tetrachlorobenzoquinone polymerization inhibitor, the temperature in the kettle is raised to 89-91℃, quickly add 6% of the pre-emulsion solution and 0.4 par...

Embodiment 3

[0069] (1) Preparation of component A zero VOC polymer emulsion:

[0070] 1.1 Preparation of pre-emulsion: add 35 parts of deionized water, 0.6 parts of German Ham NP-10 anionic emulsifier, 0.5 parts of BASF A25 non-ionic emulsifier to the emulsification tank in terms of mass fraction, and then use a peristaltic pump to remove 30 Part of n-butyl acrylate, 45 parts of ethyl acrylate, 30 parts of styrene, 0.5 part of hydroxyethyl methacrylate and 0.6 part of methacrylic functional monomer are added to the emulsification tank, and the stirring blade is turned on for high-speed shear emulsification and stirring The paddle speed is 400 rpm, and the stirring time is 30 min.

[0071] 1.2 Emulsion polymerization: In terms of mass fraction, add 65 parts of deionized water, 0.8 parts of German Ham NP-10 anionic emulsifier, and 0.4 parts of BASF A25 into a reactor equipped with a stirring blade, condenser and peristaltic pump feeding device. Ionic emulsifier, 0.3 part of sodium carbonate buf...

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Abstract

The invention discloses zero-VOC (volatile organic compound) cement-based water-proof material copolymer emulsion and a preparation method thereof. The preparation method adopts a zero-VOC copolymer emulsion component A and an inorganic powder component B, the zero-VOC copolymer emulsion component A is prepared from deionized water, alkyl acrylate, styrene, acrylic acid functional monomers, emulsifying agents, initiators, a buffer agents, polymerization inhibitors, oxidizing agents, reducing agents, sterilizing agents and defoaming agents through polymerization of pre-emulsification semi-continuous seed emulsion, and the inorganic powder component B comprises ordinary portland cement, quartz sand and water reducers. The prepared emulsion is high in solid content, low in viscosity, uniformin particle size and good in stability and has excellent rheological property and coating water absorption, the content of a residual monomer in an emulsion product is lower than 300ppm and meets national zero-VOC emulsion standards, the emulsion is environmentally friendly and free from toxicity and pollution, the compatibility of the emulsion and cement is good, and a prepared polymer cement waterproof coating is excellent in water resistance, good in low-temperature flexibility and low in water absorption.

Description

Technical field [0001] The invention relates to a waterproof coating, in particular to a zero-VOC cement-based waterproof material polymer emulsion and a preparation method thereof. Background technique [0002] In recent years, the rapid development of the real estate industry has directly promoted the development of the construction industry, and a number of high-quality construction projects have emerged. At the same time, the problem of construction quality is also very prominent. Most of the buildings in my country are concrete structures and masonry structures, and the destruction of concrete is carbonization , Freeze-thaw damage is common, the existence and migration of water are important reasons for the destruction of the performance of concrete and masonry structures, and the efflorescence and mildew of the wall are all related to the existence and migration of water. The leakage problem has greatly shortened the service life of many buildings and caused a huge waste of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B28/04C04B24/26C08F220/14C08F220/18C08F212/08C08F220/06C08F4/40C08F220/56
CPCC04B24/2688C04B28/04C04B40/0039C04B2201/10C04B2201/20C04B2201/50C08F4/40C08F220/14C08F220/18C08F220/1804C04B2103/0095C04B2103/0096C04B2103/67C04B2103/50C04B14/06C04B24/18C08F212/08C08F220/06C08F220/20
Inventor 张心亚张雄李利宏李红强
Owner SOUTH CHINA UNIV OF TECH
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