The main function of the primer of color coated aluminum coil is to provide adhesion for the coating and prevent corrosion of the aluminum coil. Color coated aluminum coil manufacturer generally choose epoxy paint as the primer because it has strong adhesion,strong corrosion resistance, excellent mechanical properties, wear resistance, impact resistance and environmentally friendly.
Why is epoxy paint more suitable as the primer ?
Excellent chemical resistance
Epoxy paint does not contain ester bonds and contains aliphatic hydroxyl groups. After curing, the chemical properties are stable, alkali-resistant and oil-resistant.
Strong adhesion
Epoxy paint contains highly polar ether groups and hydroxyl groups, which produce strong interaction forces with the substrate interface and have strong adhesion to aluminum materials.
Good toughness.
Epoxy paint contains ether bonds, which give it the ability to rotate the molecular chain inward, good toughness and not easy to break.
Good electrical insulation
The cured epoxy paint shows excellent insulation and its electrical properties are the breakdown voltage of 35~50kV/mm at room temperature and the volume resistivity of 10Ω.cm.
Good heat resistance
Reference temperature environment:30℃
Operating ambient temperature:(average daily temperature ≤ +35℃) -35~+70c
Please pay attention to safety when using,wait until the power is turned on to warm up before operation
Why is epoxy paint not suitable as The topcoat?
Epoxy paint is composed of epoxy resin, a large amount of zinc powder, additives, etc. It has the triple anti-rust effects of cathodic protection, corrosion inhibition and shielding. It is the better choice primer for metal anti-corrosion and anti-rust in atmospheric environment. At the same time, epoxy paint will produce zinc salt, which causes the coating to powder under the influence of ultraviolet rays, and the decorative effect is poor.
Paint film powdering
Epoxy paint contains a large amount of zinc powder, which will react with oxygen, water vapor, etc. in the air to produce zinc salt. Under ultraviolet light, the surface of the paint film will gradually become powdery and fall off.
Poor weather resistance
Epoxy paint contains ether bonds and the resin molecules are easily degraded under the sun's ultraviolet rays. The chain breaks and the paint film will lose gloss and powder, so it is not suitable for use as outdoor decorative topcoat.
Poor decorative properties
Epoxy paint has few color options and low surface gloss. The paint film is relatively rough and does not have good decorative properties to meet the aesthetic requirements as the topcoat for colored alumminum coils.
What is the function of epoxy paint as the primer?
Epoxy paint as the heavy-duty anti-corrosion primer has extremely strong adhesion. When used in conjunction with PVDF/PE topcoat, it can enhance the adhesion and uniformity of the entire coating, improve the durability and anti-corrosion performance of the coating, get the best anti-corrosion protection effect and ensure the stability and durability of the entire coating system.
Improve adhesion
Epoxy paint is the paint with the strongest adhesion. It can be used as a connection layer between the aluminum substrate and the entire coating to prevent the paint from falling off.
Protective substrate
Epoxy paint has excellent mechanical properties and can effectively prevent paint from falling off
Enhanced corrosion resistance
Epoxy primer applied on aluminum coil can enhance the anti-corrosion and anti-rust ability
About Us
Shandong Hanchen Metal Co.,Ltd is a professional color coated aluminum manufacturer integrating production, sales and trade. We have professional two automatic production lines with four-roller coating equipment. The whole production process has strict quality control and inspection. Our main products are aluminum coils and prepainted aluminum coils,widely used in metal roofing, aluminum ceiling, aluminum composite panel, aluminum sandwich panel, aluminum honeycomb panel and so on. We are committed to providing customers with high-standard products and satisfactory services and highly efficient solutions
How do we ensure product quality?
The production of color coated aluminum coils requires strict control of raw material quality, optimization of coating process, control of production environment, strengthening of quality inspection and improvement of production efficiency.
Strictly control the quality of raw materials
High-quality aluminum coils are the basis for producing high-quality color-coated aluminum coils. During the production process, the quality of raw materials is strictly controlled to ensure that the selected aluminum coils meet the relevant standards.
Optimize the coating process
Coating treatment is a key link in the production of color-coated aluminum coils. In order to achieve excellent coating effects, it is necessary to continuously optimize the coating process, including the selection, ratio, and coating method of the coating.
Control the production environment
Humidity, temperature, dust and other factors in the production environment will affect the quality of color-coated aluminum coils. These environmental factors need to be strictly controlled during the production process to ensure that the production environment is stable and clean
Strengthen quality inspection
Quality inspection is an important means to ensure the quality of color-coated aluminum coils. During the production process, it is necessary to strengthen the intensity of quality inspection to ensure that each process meets the relevant standards, thereby improving the quality of the final product.
Improve production efficiency
On the premise of meeting product quality, improving production efficiency is the key to reducing production costs and improving market competitiveness. It is necessary to continuously optimize production processes and update energy-saving equipment to improve production efficiency.
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