The coatings currently used for the inner walls of beer fermentation tanks are all solvent-free anticorrosive coatings. After more than 10 years of practical application by more than ten beer companies including Qingdao Brewery, the coating has no effect on beer quality, good antiseptic effect, non-toxic, excellent sanitary and physical and chemical properties, strong adhesion, and long service life. The coating has a smooth appearance and is easy to clean and disinfect, similar to enamel. Cured at room temperature, ready to use after one week of coating, or heated to accelerate curing. The coating is excellent in water resistance, alcohol resistance, alkali resistance, weak acid resistance, oxidation resistance medium, and temperature resistance.
The safety and durability of the food industry (vinegar, soy sauce storage tank) projects are major issues related to the national economy and people's livelihood. Vessels, tanks, tanks and other containers used in the storage, fermentation, and marinating of vinegar, soy sauce, and pickles are mainly composed of metal and non-metal materials. The metals are mainly carbon steel, and the non-metal materials are cement. Mortar, concrete, ceramic, organic coating, glass fiber reinforced plastic, anti-corrosive layer of acid-resistant brick, etc.
The traditional porcelain altar and porcelain urn have small capacity and low production capacity. After using the cement pool, the production capacity is increased, but the durability is poor. Generally, it will be scrapped in 2 ~ 3 years. About 5 years; stainless steel has excellent mechanical properties and corrosion resistance, but the cost is extremely expensive, and its promotion is limited.
Food industry tanks, tanks, and tanks manufactured by spraying epoxy paint on the inner wall of food containers on the surface of carbon steel or cement have good durability, low cost, meet food hygiene requirements, and have no adverse effects on food. A shortcut to cost.
Drinking food, especially water, beverages, condiments, alcohols, etc., is a better solvent, and its container is more corrosive. If the inner wall is not treated with anti-corrosion treatment, it will cause corrosion damage and pollute drinking. Water or drink. This not only causes waste, but more serious, if people drink contaminated water or drinking products, they will endanger their physical and mental health.
Therefore, the inner wall of the food container is often coated with an anti-corrosive coating that is resistant to acids, oils and alkalis to ensure that drinking water or drinking products meet drinking hygiene standards.
At present, most of the domestic and international food container inner wall coatings are epoxy resin coatings, and they use primer and topcoat supporting systems. Most of these coatings use organic solvents. With the increasingly strict environmental protection regulations, the application of solvent-based coatings is gradually restricted.
A kind of epoxy coating on the inner wall of a food container developed and produced as a sample was developed, and the performance and practical application of this type of coating are briefly summarized.
(1) Non-toxic, non-volatile, environmentally friendly, can be in direct contact with food.
(2) Smooth, bright, hard, wear-resistant, and good physical and mechanical properties.
(3) Good water resistance and chemical resistance.
(4) Medium corrosion resistance (alcohol resistance up to 50 °, 30% hydrogen peroxide, 10% NaCl resistance), high and low temperature resistance (low temperature resistance -55 ° C, heat resistance 80 ° C) and other advantages Performance of similar products at home and abroad.
(5) It can be thickly applied, and a dry film thickness can reach 200 ～ 1000μm, which can form a long-term anticorrosive coating alone.
(6) The primer is integrated, and no primer is required for application.
(7) The coating has good construction adaptability and adhesion to the substrate; it can be applied in the ambient temperature range of 10-50 ° C, and the adhesion of the coating to the substrate (steel substrate) is greater than 25MPa (pulling method) ).
(8) The paint has a long service life, and the normal service life can reach 20 years.
Epoxy coating for food container inner wall can be used for anti-corrosion protection on the inner walls of various closed compartments of ships and the inner walls of food and beverage processing tanks (pools, tanks), such as ship's ballast tanks, fuel tanks, drinking water tanks, and beer fermentation tanks in the food and beverage industry , Malt tank and rice wine, wine, medium and low spirits, drinking water, fruit juice, soy sauce, edible vinegar, vegetable oil, flour silos, and crude oil, gasoline, diesel and other petroleum products storage tanks (pools, tanks) and their distribution in the chemical industry The inner wall of the device, etc. And the coating is resistant to Cl-erosion (resistance to seawater immersion for three years, the coating does not crack, does not fall off, and the paint film does not change), and has broad application prospects in marine development and seawater utilization (such as desalination).
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