Fluorinated acrylate emulsion as well as preparation method and application thereof

Abstract

The invention provides a fluorinated acrylate emulsion which is prepared from the raw materials comprising the following components in parts by weight: 30-50 parts of butyl acrylate, 40-60 parts of methyl methacrylate, 0.1-2 parts of acrylic acid, 0.1-5 parts of a polymerizable photochromic compound, 0.1-10 parts of a fluorinated acrylate monomer, 0.1-1 part of a reaction type emulsifier, 0.1-0.5part of sodium bicarbonate, 0.1-1 part of an initiator and 100-200 parts of water, wherein the polymerizable photochromic compound is of a structure of a formula (I). Compared with the prior art, thefluorinated acrylate emulsion provided by the invention has the characteristics of low surface energy, hydrophobicity, photochromism and the like, and is capable of maintaining a hydrophobic state when being applied to a photochromic coating under alternative radiation of ultraviolet / visible light, so that the photochromic coating can be applied to fields such as paper and woven cloth.

Description

technical field [0001] The invention relates to the technical field of photochromic coatings, in particular to a fluorine-containing acrylate emulsion and a preparation method and application thereof. Background technique [0002] In recent decades, photochromic coatings, as a new type of functional polymer materials, have attracted the attention of researchers. Photochromic coating refers to a photoresponsive material whose color changes reversibly under the irradiation of different wavelengths of light. It is now widely used in printing, textiles, anti-counterfeiting materials, biological activity detection, and military industry. and many other fields. [0003] Organic photochromic materials in the prior art mainly include spiropyrans, azobenzenes, salicylaldehyde anilines, diarylethenes, etc.; among them, spiropyrans are the systems that have been studied earlier and widely used. one. The absorption of most spiropyran compounds generally occurs in the range of 200-400...

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Problems solved by technology

However, in these preparation methods, the sol-gel method has strict synthesis conditions, poor product stability and experimental repeatability; the self-assembly method and surface modification method have complex operation processes and are difficult to realize industrialization; for example, Zhang Ting prepared acrylic acid by self-emulsification method ester emulsion, and the self-made spiropyran was wrapped with the emulsion to obtain photochromic microspheres, but the spiropyran was only physically wrapped, and the compatibility with the polymer matrix was poor, and the prepared product had poor stability (Zhang Ting , Fu Liuwa, Chen Zhikang, et al. Preparation of photochromic microspheres by self-emulsification[J]. Functional Materials, 2016,47(s1):234-237)

In traditional emulsion polymerization, due to the migration of small molecule emulsifiers to the surface of the film over time, the product performance is poor and unstable. At the same time, the surface of the photochromic coating is hydrophilic after ultraviolet radiation increase, surface energy increases, and hydrophobicity decreases, which limits its wide application in textiles, coatings, etc.

As the spiropyran photochromic coating prepared in the prior art, under the alternating radiation of ultraviolet / visible light irradiation, the surface properties change: under the irradiation of ultraviolet light, the C-O bond in the hydrophobic SP structure is broken, and the indole moiety The nitrogen atom is positively charged and the oxygen atom is negatively charged, changing from two mutually orthogonal ring systems to a planar hydrophilic MC open ring structure. This change makes the coating surface more hydrophilic and not hydrophobic. , limiting its wide application in textiles, coatings, etc.

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