As a traditional paint, the selection of its main raw materials has a decisive influence on the performance, use and environmental protection of the paint. The following is a detailed introduction to the main raw materials of oil-based paint:
Oil-based paint is mainly composed of four parts: film-forming substances, pigments, solvents and additives. Among them, film-forming substances are the basis of oil-based paint and determine the basic properties of paint and coating film. Pigments provide color and hiding power for paints, solvents are used to adjust the viscosity and construction properties of paints, and additives are used to improve the performance and stability of paints. In contrast, water-based paints can be understood by looking at the types of water-based paints.
Main raw materials of oil-based paints
1. Film-forming substances
Film-forming substances are the core raw materials of oil-based paints, mainly composed of oils and resins. Among them, oils are the main film-forming substances of oil-based paints. Commonly used oils include tung oil, linseed oil, catalpa oil, soybean oil, sunflower oil and fish oil. These oils have the advantages of easy production, low price, good brushability, flexible coating film and good permeability. However, their drying speed is slow and the coating film has relatively poor physical and chemical properties, which limits the application scope of oil-based paints to a certain extent.
In order to improve the performance of oil-based paints, modern oil-based paint industry mainly uses resin as a film-forming substance. Resin is a high molecular polymer with excellent film-forming property, adhesion and durability. Commonly used resins include alkyd resin, acrylic resin, chlorinated rubber resin and epoxy resin. The addition of these resins can not only improve the drying speed and physical and chemical properties of the coating, but also increase the hardness and wear resistance of the coating.
2. Pigments
Pigments are an important component of oil-based paints, which provide color and hiding power for the paint. Commonly used pigments are organic pigments and inorganic pigments. Organic pigments are bright in color and strong in coloring power, but have poor light resistance and weather resistance; inorganic pigments have high light resistance and weather resistance, but the colors are relatively single. In oil-based paints, the selection and matching of pigments need to be carried out according to the purpose and performance requirements of the paint.
3. Solvents
Solvents are another important raw material in oil-based paints, which are used to adjust the viscosity and construction properties of paints. Commonly used solvents include petroleum solvents, turpentine, alcohol solvents and ester solvents. The properties of these solvents such as evaporation rate, solubility and toxicity have an important impact on the construction and environmental protection of paints. Therefore, when selecting solvents, factors such as environmental protection and safety need to be considered.
4. Additives
Additives are auxiliary raw materials in oil-based paints, which are used to improve the performance and stability of paints. Commonly used additives include desiccants, thickeners, leveling agents, defoamers and preservatives. The addition of these additives can improve the drying speed, leveling and construction performance of the paint, and reduce the problems of blistering and corruption of the paint. At the same time, some additives can also improve the water resistance and chemical resistance of the paint.
The main raw materials of oil-based paints include film-forming substances, pigments, solvents and additives. Among them, film-forming substances are the core raw materials of oil-based paints, which determine the basic properties of paints and coatings. When choosing oil-based paint, it is necessary to select and match the raw materials according to the purpose and performance requirements of the paint. At the same time, factors such as environmental protection and safety need to be considered to ensure the healthy and safe use of the paint.
