Frequent quality incidents in coatings: A must-learn course on coating knowledge.
1. What is paint?
Paint refers to a liquid or powder material that can be applied to the surface of an object through a specific construction process. After drying and curing, it forms a firmly adhered, solid coating with a certain strength, providing protection, decoration, or other special functions to the coated object. There are many types of paint with a wide range of uses, playing an important role in the national economy and people's lives. The average annual usage of paint per person is one of the important indicators of a country's living standards.
2. What is the difference between paint and coatings?
In our country, it is generally believed that coatings are water-based paints used for brushing the surfaces of buildings, while paints are used for wood and metal. In fact, this is a misunderstanding. Coatings include paints, which can be divided into water-based and oil-based paints. With the development of the petrochemical industry and the emergence of various chemical products, modern coatings have deviated from the traditional oil-based production. More and more coating products are prepared through chemical synthesis, and the types and applications of coatings are becoming increasingly diverse. Therefore, the distinction between them is that paint is a type of coating, while the meaning of coatings is broader.
3. What are the general functions of coatings?
Decorative: The color, texture, finish, and gloss level of coatings provide decorative effects.
Protective: Different coatings provide protection for different types of substrates. Depending on the coating formulation, coatings can offer protection against high humidity, chemicals, oils, corrosion, algae growth, and wear.
Special functions: Coatings can also be formulated for special purposes. For example, fluorescent paint for signage, as well as fire-retardant paint, anti-condensation paint, and electrophoretic paint.
4. What are the general properties of coatings?
The properties of coatings can be divided into: the appearance of the paint when opened, and low-temperature freeze-thaw resistance.
Application methods and properties of coatings: brushing, rolling, spraying, and leveling performance during application.
Appearance of the coating: such as gloss, fullness, color, and fineness.
Drying time: surface drying time, thorough drying time, re-coating time, and maintenance period.
Adhesion: adhesion to the substrate or to the old paint film.
Coverage: whether it covers the base after the normal number of coats.
Mechanical properties: hardness, impact resistance, flexibility.
Resistance: resistance to ultraviolet light, chemical agents, wear, water alkali, and mold algae.
Durability: whether it maintains gloss and color over a long period.
Storage stability: sedimentation tendency, viscosity stability, etc.
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