Classification and characteristics of water-based coatings

Classification and characteristics of water-based coatings - water-based alkyd paints

2020-02-22 14:15:20
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Classification and characteristics of water-based coatings - water-based alkyd paints

The vegetable oil is reacted with an acid anhydride after alcoholysis to form an alkyd resin, and the content of the hydrophilic group can be increased to form a water-soluble or water-dispersible resin.Water-soluble water-based alkyds are quite transparent in appearance but have color,The alkyd emulsion was brown and yellow and opaque. The unsaturated bond in alkyd resin is the basic guarantee of excellent properties.Like the solvent-type alkyd, the performance of the coating can be adjusted by the length of the oil. The oiliness is short, the drying is fast, the gloss is high, the hardness of the paint film is large, the oiliness is long, the flexibility of the paint film is good, and the impact resistance is good.Therefore, water-based alkyd can be divided into short oil degree and long oil degree.

Alkyd resins have a good permeability to wood and are particularly suitable for making water-based colorants.Another advantage of water-based alkyds is the use of oxygen in the air to cross-link the curing, so the solvent resistance of the paint film is much better than that of other single-component water-based paints.Acrylic modified waterborne alkyd is an acrylic monomer which is incorporated into the molecule during the synthesis of alkyd, and the gloss retention of the modified alkyd resin is remarkably improved.Recently, in order to further improve the performance of waterborne alkyd paints, an alkyd/acrylic hybrid technology has been developed to form a core shell system in which an alkyd polymer is a core and an acrylic polymer is a shell, the hydrophilic acrylic shell protects the alkyd core from hydrolysis.After the coating, the water in the paint evaporates, and the fine particles of the emulsion penetrate into the micropores of the wood, and the linear polymer molecules are further oxidized and crosslinked to form a film.

The aqueous urethane oil is an alkyd resin modified with a diisocyanate.The diisocyanate reacts with the hydroxyl group of the alkyd resin to form a polyurethane structure, which has the properties of certain polyurethanes while retaining the characteristics of oxidative crosslinking of the alkyd resin. The one-component water-based paint thus produced is convenient to construct and has excellent performance. One of the fine varieties in water-based paints.

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