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Based on their chemical composition, powder coatings can be mainly divided into the following types: polyester, epoxy, polyurethane, acrylic and mixed powder coatings. Each type of powder coating has different characteristics, performance and application scope.

1. Polyester powder coatings

Polyester powder coatings are the most common type of powder coatings, which are mainly composed of polyester resin and hardener. Polyester powder coatings have good weather resistance and UV resistance and are suitable for outdoor environments. They are widely used in building materials, home appliances, outdoor metal products and other fields. A notable feature of polyester powder coatings is its smooth surface, beautiful coating and strong corrosion resistance.

Advantages:

(1) Good weather resistance, can withstand harsh environments such as sunlight, wind and rain;

(2) Rich colors, can maintain bright colors for a long time;

(3) Low cost and high cost performance.

Disadvantages:

(1) Relatively weak tolerance to high temperature environments;

(2) Less resistant to chemicals than epoxy powder coatings

2. Epoxy powder coatings

Epoxy powder coatings are composed of epoxy resins and curing agents and are usually used in applications where corrosion resistance is required. This coating has excellent adhesion and chemical resistance and is suitable for metal surfaces that are exposed to chemicals or humid environments for a long time. Epoxy powder coatings are often used in automobile chassis, industrial equipment, and other occasions requiring strong corrosion resistance.

Advantages:

(1) Strong corrosion resistance, suitable for humid and chemical environments;

(2) Strong adhesion and firm coating;

(3) Smooth coating and smooth surface.

Disadvantages:

(1) Poor weather resistance, long-term exposure to sunlight will cause fading and aging;

(2) Low hardness and easy to scratch.

3. Polyurethane powder coatings

Polyurethane powder coatings are formed by the reaction of polyurethane resin and curing agent. This type of coating is usually used in places that require high wear resistance and high chemical corrosion resistance. Polyurethane powder coatings are suitable for automotive parts, mechanical equipment and outdoor furniture. They provide excellent UV resistance and chemical resistance, so they are more common in applications with complex environments.

Advantages:

(1) High wear resistance, suitable for surfaces with frequent contact,

(2) Strong UV resistance and chemical resistance, suitable for harsh environments;

(3) Good anti-aging properties.

Disadvantages:

(1) High cost, more expensive than polyester coatings;

(2) High curing temperature, requiring higher temperatures to complete curing.

4. Acrylic powder coatings

Acrylic powder coatings are mainly composed of acrylic resin and curing agent, and have good UV resistance and weather resistance. Acrylic powder coatings are often used for outdoor building

and automotive surface coatings, especially in applications that require high surface gloss and color retention. This type of coating has good leveling and coating aesthetics, and is suitable for occasions with high requirements for appearance.

Advantages:

(1) Bright colors, high gloss, and beautiful coating effects;

(2) Excellent weather resistance, can effectively resist ultraviolet rays and air pollution,:

(3) Good water resistance, suitable for environments with heavy humidity.

Disadvantages:

(1) Poor chemical resistance, not suitable for environments with high chemical corrosion,

(2) High cost.

5. Hybrid powder coatings

Hybrid powder coatings usually combine epoxy resin and polyester resin, combining the advantages of both. This type of coating has good adhesion, chemical resistance and weather resistance, and is widely used in various medium-demand industrial coating occasions. For example, it is often used in electrical housings, metal furniture, industrial parts, etc.

Advantages:

(1) Strong comprehensive performance, able to take into account corrosion resistance, weather resistance and aesthetics;

(2) High cost performance, suitable for general industrial coatings.

Disadvantages:

(1) Performance is inferior to that of single resin coatings and may be slightly insufficient in certain specific applications.