As an important part of the chemical industry, coatings play a major role in daily production applications. In 1915, Shanghai Kailin Paint Factory was founded, which kicked off the development of my country’s paint industry. After a century of twists and turns, my country has gradually become the world’s largest paint producer, with annual output accounting for more than 20% of the world’s total output.
The overall development goal of the “14th Five-Year Plan” points out that during the “14th Five-Year Plan” period, the economic aggregate of my country’s coatings industry must maintain steady growth, with the total output value growing at an average annual rate of about 4%. By 2025, the total output of the coatings industry is expected to grow to about 30 million tons.
It can be seen that my country’s paint industry still has a lot of room for development, and paint involves many industries, so it has always maintained a huge demand scale. So, in this issue, let us go deeper into the coatings industry and understand its production and application.
Coating Introduction
Coating is a It is a widely used material. Because in the early days, most of it used vegetable oil as the main raw material, it was also called paint. However, at present, the vegetable oil in paint has been basically replaced by synthetic resin.
Paint can only perform its functions after it is applied to the surface of an object and forms a continuous coating film. It generally has multiple functions such as anti-corrosion and mildew prevention, decoration, insulation, and marking.
Composition materials
Coatings are generally composed of film-forming substances (resin ), pigments, fillers, solvents and additives.
Film-forming substance (resin)
Film-forming substances (resins) are the basis of coatings. They have the function of bonding other components in the coating to form coatings, and are decisive for the performance of coatings and coatings. effect.
There are two main types of film-forming substances, namely conversion-type film-forming substances and non-conversion-type film-forming substances. The difference between the two is mainly reflected in the molecular structure. Non-conversion film-forming substances are also called thermoplastic resins, that is, the space structure of resin molecules is linear or T-shaped; conversion film-forming substances are also called thermosetting resins, that is, the space structure of resin molecules is network type.
Pigments and fillers
Pigments and fillers are mainly used for coloring coatings And improve the performance of the coating film, enhance the protection, decoration and anti-rust effect of the coating film, but some pigments and fillers can provide the coating film with specific functions such as flame retardation, conductivity, and anti-camouflage. According to their role in coatings, they can be divided into coloring pigments, anti-rust pigments, and extender pigments.
Solvents
The solvents involved in paint production mainly include volatile organic solvents or water, which can disperse film-forming substances and pigments to form viscous liquids , and improve some properties of the coating film. However, the solvent itself does not constitute a coating and should not remain in the coating film.
Auxiliary
The additive cannot form a coating film alone. Its function is to exist in the coating film as a component in the coating film after the coating film is formed. According to the different effects in different aspects of paint production, additives can be divided into four types, namely additives that act on the paint production process; additives that act on the paint storage process: additives that act on the film-forming process of paint construction. Additives that play a role in coating performance; additives that play a role in coating properties.
Classification and Application
There are many ways to classify coatings, including use, status, and film-forming substances (resin). , use method, coating application, pigments and fillers, etc. to classify.
But generally speaking, the main classification method of coatings is based on use, supplemented by main film-forming substances. According to the use, it can be divided into three categories: architectural coatings, industrial coatings, and general coatings (including auxiliary materials), involving subdivisions such as construction, ships, automobiles, and furniture; according to the main film-forming substances, it can be divided into epoxy coatings , polyurethane paint, acrylic paint, alkyd paint, nitro paint and other categories.
Next, we will focus on the raw material composition of the coating industry and introduce relevant products and market conditions one by one, so stay tuned!
Film-forming substance (resin)
Film-forming substances (resins) are the basis of coatings. They have the function of bonding other components in the coating to form a coating film, and play a decisive role in the performance of coatings and coating films.
There are two main types of film-forming substances, namely conversion film-forming substances and non-conversion film-forming substances.Nature, the difference between the two is mainly reflected in the molecular structure. Non-conversion film-forming substances are also called thermoplastic resins, that is, the space structure of resin molecules is linear or T-shaped; conversion film-forming substances are also called thermosetting resins, that is, the space structure of resin molecules is network type.
Pigments and fillers
Pigments and fillers are mainly used for coloring and improving coating properties, and enhancing the protection, decoration and anti-rust effects of coatings. However, some pigments and fillers can provide Specific functions such as flame prevention, conductivity, and anti-camouflage. According to their role in coatings, they can be divided into coloring pigments, anti-rust pigments, and extender pigments.
Solvent
The solvents involved in coating production mainly include volatile organic solvents or water, which can disperse film-forming substances and pigments to form viscous liquids, and improve certain properties of the coating film . However, the solvent itself does not constitute a coating and should not remain in the coating film.
Auxiliary
The additive cannot form a coating film alone. Its function is to exist in the coating film as a component in the coating film after the coating film is formed. According to the different effects in different aspects of paint production, additives can be divided into four types, namely additives that act on the paint production process; additives that act on the paint storage process: additives that act on the film-forming process of paint construction. Additives that play a role in coating performance; additives that play a role in coating properties.
