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Composition and function of coatings

- May 30, 2018 -

Composition and function of coatings

Different kinds of coatings, there are four components, namely (1) resin (2) pigment (3) solvent (4) additives.Among them, the solvent is volatile, which makes three parts is basically non-volatile.

(1) resin

Resin is the film forming material, which is the most important component and base of coating, also known as the base material, it is the main factor that determines the property of coating.

Resin as a film forming material is required to be stable in the coating storage period without obvious physical and chemical changes.In film forming, under the specified conditions, the film can be cured quickly.

There are many kinds of resins, such as acrylic resin, epoxy resin, polyester resin and polyurethane resin.Different tree ` fat, its physical properties and chemical properties, and weather resistance, corrosion resistance and so on are not the same.

(2) pigment

Pigment must be used in combination with resin. The main role of the pigment in the coating is to color the coating. Different pigment proportions will affect the hardness, gloss and corrosion resistance of the coating.

(3) solvent

Solvent is an important component of liquid coatings, and it is a volatile component in the drying process of coatings.The solvent used to adjust the viscosity of coatings is called thinner.Solvent has a great influence on the manufacture, storage, application, formation and forming quality of paint film.

(4) auxiliary

Additives are small amounts of additives added to improve the performance of coatings.The dosage of additives in coatings is very small, but their effects are significant. For example, some of them can improve the performance of coatings and coatings, some of them can improve the drying time, and some of them can prevent the coating from causing morbidity.There are many kinds of additives, such as dryers, curing agents, leveling agents, antifoaming agents, antifoaming agents, stabilizers, etc.

Almost most liquid coatings are composed of some of the above four components, the most important of which is resin, which is indispensable to any coating.It can be said that resin (sometimes with solvents and additives) is a transparent paint, and then add paint can be a variety of color paint.

The coatings used for color coated steel plate are generally divided into two categories according to their USES: construction and home appliances.Architectural coatings are selected from epoxy resin, polyester resin, polyvinyl chloride plastic sol, silicon modified polyester and polyvinylidene fluoride, depending on the use environment.The paint used for home appliances is usually colored polyester resin.