Organic-inorganic composite emulsion for coating and preparation method of organic-inorganic composite emulsion

Abstract

The invention relates to an organic-inorganic composite emulsion for a coating. The organic-inorganic composite emulsion comprises the following components of: silica sol, a silane coupling agent, a deionized water monomer, an initiator, a pH regulator, nano-silver sol and amino-modified nano-silver sol. According to the organic-inorganic composite emulsion for the coating and the preparation method of the organic-inorganic composite, the inorganic components are nano-silica and nano-silver, the emulsifying effect of the modified nano-silica is good; the prepared emulsion has good stability; the modified silica can well adsorb the nano-silver; the organic component acrylate polymer is bonded with the modified nano-silver by optimizing a functional monomer, so that a high nano-silver loading rate is realized. According to the emulsion prepared by the method, the nano silicon dioxide and the nano silver can uniformly and stably exist around latex particles, a dispersion process for preparing the coating is simplified, and meanwhile, the problem of unstable agglomeration of inorganic nano particles is solved, so that the coating has a stable and long-acting antibacterial effect.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to an organic-inorganic composite emulsion for coatings and a preparation method thereof. Background technique [0002] With the development of society and the continuous improvement of people's living standards, health and environmental protection have gradually become people's primary choice. Since microorganisms are ubiquitous in the environment, people's survival and health have been threatened by various bacteria all the time. Antibacterial coatings can be coated on the surface of various materials to play an antibacterial effect and protect people's health. [0003] At present, more studies are made on additive antibacterial coatings, which are antibacterial coatings made by adding antibacterial agents that can exist stably in the base material and combining certain processing techniques. Antibacterial agents used in additive antibacterial coatings mainly include inorganic ...

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Problems solved by technology

Directly adding nano-antibacterial particles will have a lot of problems in terms of stability and matrix resin compatibility. Patent CN 1616559A discloses a method for preparing a silver-containing antibacterial coating. The method used is similar to the above-mentioned self-cleaning coating. agent, this method still fails to solve the compatibility and stability problem of silver-based antibacterial agent and resin

There are also more studies on the use of porous silica to load nano-silver in order to solve the problem of system stability. Patent CN 107189585A attempts to use porous silica as a carrier to coat nano-silver, thereby solving the system stability and silver antibacterial durability. question

However, silica-coated nano-silver and resin exist in the coating formulation system through physical blending, and there are problems of difficult dispersion and system stability.

[0004] Added antibacterial coatings, the added nano antibacterial agent has compatibility problems with the coating formulation, and it is difficult to disperse and the stability is not strong

[0005] The preparation process of silica-loaded nano-silver is complicated, the cost is high, and the output is small. In addition, there are also problems such as difficult dispersion and poor stability in the process of preparing coatings.

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