Toluene diisocyanate manufacturer Knowledge The composition and classification of coatings

The composition and classification of coatings

Coating composition

Coatings are generally composed of non-volatile components and volatile components. After it is coated on the surface of an object, its volatile components gradually evaporate and escape, leaving non-volatile components that dry and form a film, so they are also called film-forming substances. Film-forming substances can be divided into three categories: primary, secondary, and auxiliary film-forming substances. The main substance can form a film alone, or it can form a film together with secondary film-forming substances such as adhesive materials. It is the basis of the coating, referred to as the base material. The components of coatings can be composed of a variety of raw materials.

Composition of paint

Coating composition

Composition

Raw materials

Main film-forming substances

Oil

Animal oil; shark oil, hairtail oil, butter, etc.

Vegetable oil; tung oil, soybean oil, castor oil, etc.

Resin

Natural resins: shellac, rosin, natural asphalt, etc.

Synthetic resins: phenolic resin, alkyd resin, amino resin, acrylic resin, etc.

Secondary film-forming substances

Pigment

Inorganic pigments: titanium dioxide, zinc oxide, chrome yellow, iron blue, carbon black, etc.

Organic pigments: toluidine red, phthalocyanine blue, light-fast yellow, etc.

Anti-rust pigments: red lead, zinc chrome yellow, barium metaborate, etc.

Body Pigment

talcum powder, calcium carbonate, barium sulfate, etc.

auxiliary film-forming substances

Auxiliary

Plasticizer, drier, curing agent, stabilizer, antifungal agent, antifouling agent, emulsifier, wetting agent, anti-skinning agent, Initiators, etc.

Volatile substances

Thinner

PetroleumSolubleAgent (such as No. 200 paint solvent), benzene, abenzene, Xylene, chlorobenzene, turpentine, cyclopentadiene, butyl acetate, butanol, ethanol, etc.

The compositions in Table 4-1 are for general paints. Due to different types of coatings, some compositions can be omitted. For example, various varnishes are transparent bodies without pigments and extender pigments; putties are thick slurries with a large amount of extender pigments added; paints (including enamels, mixed paints and primers) are added with an appropriate amount of pigments and Opaque body of extender pigments. Those that use low-viscosity liquid resin as the base material and do not add volatile diluents are called solvent-free paints; those that have a powdery base material and do not add solvents are called powder coatings; those that generally use organic solvents are called solvent-based paints. Paints; those that use water as a diluent are called water-based paints.

Classification of coatings

There are five ways to classify paints internationally. The first classification method is to classify by use, such as building paint, ship paint, electrical insulation paint, Automotive paint, etc.; the second classification method is based on the construction method, such as brush paint, spray paint, baking paint, fluidized bed removal paint, etc. The second classification method is based on the function of the paint, such as primer , anti-rust paint, anti-corrosion paint, fire-retardant paint, high-temperature resistant paint, first-coat paint, second-coat paint, etc.; the fourth classification method is based on the appearance of the paint film, such as bright red paint, glossy paint, etc.Ethylene oxide and its copolymers, polyvinyl acetal resin, divinyl acetylene resin

Continuation table

Serial number

Code name (Chinese

Pinyin letters)

Film-forming substances

Category

Main film-forming substances

..

11

B

Acrylic paint

Acrylic resin, acrylic copolymer and modified resin

12

Z

Polyester paint

He and polyurethane resin, unsaturated polyurethane resin

13

H

Epoxy resin paint

Epoxy resin, modified epoxy resin

14

S

Polyurethane paint

Polyurethane

15

W

Elemental organic paint

Organic polymers of organic silicon, organic titanium, organic aluminum and other elements

16

J

Rubber paint

Natural rubber and its derivatives, synthetic rubber and its derivatives

17

E

Other paints

Other film-forming substances not included in the above list, such as inorganic polymer materials, polyimide resin, etc.

18

Supplementary materials

Thinner, moisture-proof agent, drier, paint remover, curing agent

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