Pure acrylic emulsion with excellent freeze-thaw stability and preparation method for pure acrylic emulsion

Abstract

The invention discloses pure acrylic emulsion with excellent freeze-thaw stability and a preparation method for the pure acrylic emulsion. The pure acrylic emulsion is synthesized by adopting a pre-emulsification semi-continuous seed emulsion polymerization process; a polymerizable surfactant and an un-polymerizable type surfactant are adopted as a compound emulsifier, and a functional monomer is introduced to obtain pure acrylic emulsion with excellent freeze-thaw stability. After being subjected to freeze-thaw stability cycle by 10 times, the pure acrylic emulsion prepared is also kept in a good appearance state.

Description

technical field [0001] The invention belongs to the field of organic polymer materials, and in particular relates to a pure acrylic emulsion with excellent freeze-thaw stability and a preparation method thereof. Background technique [0002] In order to promote energy conservation and environmental protection, with the approval of the State Council, consumption tax will be levied on coatings from February 1, 2015. Among them, coatings with a volatile organic compound (Volatile Organic Compounds, VOC) content of less than 420 g / L (inclusive) under construction are exempt from consumption tax. The purpose of the promulgation of this policy is to force paint companies to develop in the direction of environmental protection, energy saving, and water-based. Water-based coatings have become a main direction for the future development of the coatings industry because they use water as the dispersion medium, have the characteristics of low VOC, energy saving, environmental protecti...

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Problems solved by technology

However, these substances are extremely volatile and form VOCs, which not only cause energy waste, but also cause a lot of pollution to the atmospheric environment;

[0011] (2) Traditional emulsifiers are used in combination with ionic emulsifiers and non-ionic emulsifiers. The ionic emulsifiers on the surface of latex particles rely on electrostatic repulsion to maintain the stability of the emulsion, while non-ionic emulsifiers form an elastic hydration layer. Relying on the steric hindrance effect to ensure the stability of the emulsion, through the synergistic effect of the two, it can ensure that there will be no coalescence effect between the latex particles. Therefore, only polymerizable surfactants are used as emulsifiers, and there is no anionic emulsifier or The compound application of non-ionic emulsifier will affect its calcium ion stability;

[0013] (4) Although high Tg polymer emulsions have better freeze-thaw resistance, their film-forming properties at room temperature will decrease, and a large amount of film-forming additives must be added to make them form films. , will also volatilize into the air, causing environmental pollution

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