An organic hydrophilic coating and a manufacturing method thereof as well as an application

Abstract

The invention discloses an organic hydrophilic coating, which comprises water soluble hydrophilic acrylic resin, water soluble curing agent, leveling agent, and latent solvent. The hydrophilic coating can be packed singly to be applied to aluminum foil with antisepsis first coat coated in advance, and is provided with wide overcoatability with the first coat; abrasion to a mould coated with compound containing inorganic silicon and a mould for processing coating aluminum foil can not be caused.

Description

technical field [0001] The invention relates to the field of coatings, in particular to an organic hydrophilic coating and its preparation method and application. Background technique [0002] Since the early 1990s, China has gradually carried out anti-corrosion and hydrophilic treatment on the aluminum foil used in household air-conditioning radiators, so as to avoid the formation of water bridges between the aluminum fins when the air conditioner is running, which will cause noise, increase energy consumption, promote white powder, and produce Odor etc. In order to achieve both anti-corrosion and hydrophilic functions, a double-drying and double-coating process is generally adopted, that is, a layer of anti-corrosion primer is applied on the degreased aluminum foil, and after drying, a layer of hydrophilic topcoat is applied on it. layer. There are usually two types of anti-corrosion primers: one is an inorganic primer, that is, a chemical conversion treatment solution; ...

AI Technical Summary

Problems solved by technology

[0003] Hydrophilic topcoats are usually divided into three systems: (1) inorganic topcoat systems based on sodium silicate or / and silica sol, which can be used with inorganic or organic bottoms, but such coatings contain inorganic silicon compounds , will cause abrasion to the machining mold coated with aluminum foil, and will produce peculiar smell when the air conditioner is running; (2) an organic-inorganic composite surface coating system compounded with organic resin and sodium silicate or / and silica sol, such as Chinese patent CN200410103974 .9 and CN200710038070.6, can be used with inorganic base or organic base, but this type of coating also contains inorganic silicon compounds, which will cause abrasion to the mechanical processing mold coated with aluminum foil; (3) use pure organic resin as film-forming material Pure organic topcoat systems, such as Chinese patents CN93104232.1, CN00106726.5, CN02151903, CN03100301.X, CN200710035288.6 and U.S. patents US6698507, US63001395, US7353863, but the matching of this type of coating and anti-corrosion primer is not wide enough, It can only be matched with a pure organic primer, but when matched with an inorganic primer, the leveling, hydrophilicity and interlayer adhesion of the top coat are poor, and the long-term application of a strong acidic organic top coat will corrode the chrome-plated steel roller used for coating Sexuality, affecting the coating accuracy and service life of the roller; the coated aluminum foil is prone to white spot corrosion during storage

Weakly acidic or weakly alkaline organic topcoats usually contain raw materials that are prone to yellowing at high temperatures, resulting in easy yellowing of the coating film or insufficient hydrophilicity of the coating film due to insufficient curing, poor interlayer adhesion or poor construction stability.