Glass flake coatings (resin lining technology) were first developed by the United States. In the mid-1950s, OwensCorning Glass Fibers introduced a resin-lined material with glass flakes. It is reported to be an excellent lining material for hull and chemical storage tanks, chemical plant towers and tanks. This material is resistant to environmental media penetration and helps to extend lining life.
In the same period, Japan began to study an epoxy vinyl ester resin (VE) which is superior to the general unsaturated polyester resin (UP). In 1967, FUJI Resin Co., Ltd. developed a successful VE glass flake coating, which was successfully applied to a flue gas desulfurization device using a glass flake originally created by Nippon Sheet Glass Co., Ltd., and was put into practical use. The technology was also exported overseas.
In the early 1980s, the flue gas desulfurization unit of Guixi Smelter in China was reinforced by the company's VE glass flakes. In 1972, Japan's Mitsubishi Plastics Co., Ltd. and Japan Polymer Chemical Co., Ltd. introduced Ceilcote's technology. Toyo Rubber Industries Co., Ltd. entered Heill's technology and began large-scale R&D and application.
On the one hand, because the glass flake coating (lining) is a thick film coating in millimeters, it is very suitable for harsh corrosive environments, such as marine salt erosion areas, various chemical storage tanks, offshore buildings, coastal concrete buildings, etc.; On the one hand, Japan is surrounded by the sea, and its special geographical environment has forced it to pay more attention to long-term and effective glass flake coatings. Japan is currently in a leading position in the evaluation of resin-lined film technology. Japan established the "Sheet Lining Technology Research Society" by the Resin Lining Industry Association in 1974, and made a reasonable explanation through the theory of osmotic diffusion. He actively carried out research and development of resin scale lining technology and sheet lining technology, and expanded the glass flake coating. Application range.
Glass scale anti-corrosion is a new anti-corrosion technology. Its working principle is to arrange glass flakes in a laminated state in the resin, effectively increasing the penetration distance of corrosive medium diffusion and reducing the probability of corrosive medium contacting the protected substrate. The anti-corrosion of glass flakes is mostly realized in the form of glass flake coating.
Glass flake coatings have many advantages. After combining the advantages of glass flakes and thermosetting resins, glass flakes exhibit much higher working characteristics than ordinary glass and resins, especially in terms of resistance to penetration. The following are some of the advantages of glass flake coatings compared to ordinary glass:
1. The anti-penetration ability of glass flake coatings to various media is much higher than that of FRP. For example, chemical media, gas and steam media are difficult to penetrate glass flake coating, and glass flake coatings are rarely coated. Water vapor diffusion will occur. The reason why glass flake coatings have this feature is the lamination of glass flakes in the resin.
2. The shrinkage rate of the glass flake coating after curing is very low, so the stress existing between the glass flake and the bonding surface is small, and it is not easy to fall off due to stress.
3. The glass flake itself has a small thermal expansion coefficient, can adapt to high temperature working environment, and has good thermal shock resistance.
4. The chemical strength of the glass flake coating is lower than that of FRP, but this does not affect the wear resistance of the glass flakes. When the glass flake coating is subjected to friction, even if the damage occurs, it is limited to the local part, and rarely affects the entire glass flake coating.
5. The construction technology of the glass flake coating has good performance and low construction difficulty. The workers can finish the painting of the glass flake paint by hand. Other construction techniques such as spraying, painting and wiping are also applicable to the glass flake coating.
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