Method for improving adhesive force of unsaturated polyester resin putty and double-component waterborne epoxy primer

Abstract

The invention discloses a method for improving adhesive force of unsaturated polyester resin putty and double-component waterborne epoxy primer. The method comprises the following steps that firstly, a base material is coated with double-component waterborne epoxy primer, the primer is dried, and a paint film is formed; secondly, the surface of the paint film is coated with a cobalt catalyst solution containing cobalt iso-octoate, and then drying is conducted; and thirdly, the surface of the paint film coated with the cobalt catalyst is coated with unsaturated polyester resin putty with the preset thickness in a batched manner, and the putty is dried. After the waterborne epoxy primer is coated with a layer of cobalt catalyst, puttying is conducted, the concentration of the catalyst in the primer and putty contact face is increased, and after puttying, the reaction speed of the unsaturated polyester resin, styrene and cyclohexanone peroxide in the putty is increased at the interface position under the action of the high-concentration catalyst, the reaction of the putty at the interface position is sufficient, accordingly, penetration of the styrene to the primer is reduced, and the adhesive force is improved.

Description

technical field [0001] The invention relates to a method for enhancing the adhesion between unsaturated polyester resin putty and two-component water-based epoxy primer. technical background [0002] With the enhancement of people's awareness of environmental protection, VOC emissions are restricted. Many paint companies are researching water-based epoxy primers to replace paint epoxy primers. Major resin manufacturers have also made breakthroughs in water-based epoxy resins and water-based epoxy curing agents. It has good adhesion on steel plate and aluminum alloy substrate. Some water-based epoxy primers have good salt spray resistance and corrosion resistance. However, when coating rail transit, vehicles and construction machinery, it is necessary to scrape putty on the water-based epoxy primer to level the substrate, enhance the smoothness of the paint film, and beautify the appearance. After the traditional oil-based epoxy primer is dry, the putty is scraped, and the ...

AI Technical Summary

Problems solved by technology

For this reason, many companies require to bake the putty at 60°C for 2 to 8 hours after scraping the putty. The purpose is to accelerate the volatilization of styrene before entering the next process; The adhesion between the epoxy primer and the putty can meet the requirements after baking, but the salt spray resistance of the water-based epoxy primer is still less than 500 hours; the other part is heated at 60°C for 2-8 hours, and its Adhesion does not reach level 3 and does not meet the requirements

It has been proposed to reduce styrene in putty, but there are 30-40% styrene in the unsaturated polyester resin of the putty raw material. Styrene is used as a reactive diluent and participates in the reaction during curing. If the styrene content is reduced, the putty High viscosity will cause difficulty in construction

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