Environmentally friendly nano coating is a water-soluble coating with non-wet, non-oil, self-cleaning, anti-fouling and sterilization properties, which can not only reduce the cost of products, but also improve the performance and quality of products. It can be widely used in indoor and outdoor decoration of gymnasiums, exhibitions, hotels, etc., non-toxic, tasteless, spray and roller coating.
When preparing nanocoatings, a lot of foam is produced, which forms many pinholes inside the dry paint film. Therefore, it is necessary to add defoamers for nano coatings to the system to eliminate harmful foam and improve the performance of nano coatings. There are three main reasons for the formation of air bubbles in nanocoatings:
1.Bubbles are generated by stirring during the production of coatings;
2.Air bubbles are generated during the paint filling process, which affects the filling quality;
3.Air bubbles are generated during the construction process, which brings surface defects such as shrinkage porosity to the coating film.
At present, there are many varieties of defoamers, and the main defoamers for water-based coatings are mineral oils, silicones and polyethers. Most of the defoamers added to nanocoatings are mineral oil defoamers and silicone defoamers. Silicone defoamer can quickly defoam and long-lasting foam inhibition due to its small addition amount, wide range of application and no pollution, and can effectively solve the bubble problem caused by excessive surfactant substances and improper operation.
At the same time, most silicone defoamers are compounded with a variety of polyether-modified silicones and polyether defoamers, and are supplemented with dispersants, emulsifiers and stabilizers, etc., which have good defoaming effect under high temperature conditions, and have good stability, and are not easy to precipitate at high temperatures. Practical test and application results show that its consumption is very small, and the dosage is small, which can greatly reduce the cost of using the agent. Therefore, the application prospects of silicone defoamers in nanocoatings are very extensive.
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