The Influence and Trial Methods of Waterborne Epoxy Curing Agent

Waterborne epoxy curing agent is one of the key components that determine the final performance of waterborne epoxy floor coatings. It should be able to dissolve or disperse well in water, be stable in water, and have good compatibility with epoxy resin. At the same time, the rheological properties, shelf life, curing conditions, and paint film properties of the system should also meet the requirements for the use of floor coatings Through experiments, W-751 was selected as the curing agent for the system This curing agent is a dispersion of amine polymer in water Active ingredient 58.5% The free amine content is less than 11%, and the appearance is a light yellow clear liquid with a dryness of 8500-15000mPa s. The amine position (W body fraction) is 290-320mgKOH/g. Hydrogen '- S 1225. It has the following advantages: (1) excellent pigment lubricity, good A quality, can withstand high-speed dispersion and grinding, and has a wetting effect on inorganic and organic pigments; (2) Compatible with various types of epoxy resins and used in conjunction with OER-95 The obtained paint film has good hardness and chemical resistance

Selection of color fillers

The pigments used in water-based epoxy floor coatings should have good chemical resistance and weather resistance, such as rutile type Qinbai powder, Xianyu blue, and chromium oxide green. The selection principle of fillers is to use low oil absorption and chemically inert fillers, such as quartz powder and talc powder Considering that water-based epoxy curing agents are slightly alkaline, acidic pigments and fillers should be avoided Water based epoxy floor coating is a two-component coating A strand of pigment filler is added to the water-based epoxy curing agent component The amount of filler (expressed in terms of pigment to base ratio) has a significant impact on the final performance of A-type epoxy floor coatings. Appropriate addition can not only reduce the wood formation of water-based epoxy floor coatings and shorten the surface drying time of the coating, but also improve the mechanical strength, 0 resistance, gloss and coverage of the coating Reduce volume shrinkage during coating curing And endow the coating with good storage stability Through experiments Choose precipitated BaSO4 and hollow microspheres as fillers to ensure the gloss and leveling of water-based epoxy floor coatings

The main areas that water-based epoxy coatings should be used in:

(I) The water-based epoxy flooring material is divided into two components as a whole. When used, a sufficient RRM ratio is required to be added and activated in order to better reflect the performance of the paint film (2) To improve the bonding strength between floor coatings and substrates, one layer of water-based epoxy primer should be applied first (3) To ensure the smoothness of the topcoat and enhance the strength of the coating, a water-based epoxy intermediate coating layer should generally be applied between the topcoat and primer to serve as a carrier (4) After 24 hours of intermediate coating, the paint construction can be carried out by sanding and vacuuming with 600 # sandpaper The general application time for formulated coatings is 6 hours, so the ingredients should not be too named at once (5) After the completion of the paint job, personnel should be avoided from entering within 24 hours Maintain according to temperature conditions