What is PPGI?
PPGI(Prepainted galvanized steel coils) is a product made from hot-dip galvanized sheet, hot-dip aluminum-zinc sheet, electrogalvanized sheet, etc., which is coated with one or several layers of organic paint on the surface after surface pretreatment (chemical degreasing and chemical conversion treatment), and then baked and solidified. It can effectively resist atmospheric corrosion and water erosion, ensuring a long service life. It is named after colored steel coils coated with various organic coatings of different colors, abbreviated as colored coated coils. Also known as color steel plate or plate in the industry.
PPGI stand out in many fields due to their lightweight, beautiful appearance, and excellent corrosion resistance. They can also be directly processed, and are generally divided into gray white, sea blue, and brick red colors. They are mainly used in the advertising industry, construction industry, home appliance industry, electrical appliance industry, furniture industry, and transportation industry.
The substrate of the PPGI is an important component of the PPGI, which directly affects the performance and service life of the PPGI. According to the manufacturing process and purpose, the substrate of color coated coils can be divided into hot-dip galvanized substrate, hot-dip aluminum zinc substrate, and electrogalvanized substrate.
The product obtained by coating organic coatings on hot-dip galvanized steel plates is called hot-dip galvanized color coated plates. In addition to the protective effect of zinc, the organic coating on the surface of hot-dip galvanized color coated sheet also serves as insulation protection and rust prevention, with good coating adhesion and weldability, and a longer service life compared to hot-dip galvanized sheet. The zinc content of hot-dip galvanized substrates is generally 180g/㎡ (double-sided), and the highest zinc content of hot-dip galvanized substrates for external use in buildings is 275g/㎡.
Hot dip aluminum zinc coated steel plate (55% Al Zn) is used as the newly coated substrate, usually with an aluminum zinc content of 150g/㎡ (double sided). The corrosion resistance of hot-dip aluminum zinc plate is 2-5 times that of hot-dip galvanized plate, and its service life is more than four times that of ordinary galvanized steel plate. Continuous or intermittent use at temperatures as high as 490 ℃ will not cause severe oxidation or scale formation. The ability to reflect heat and light is twice that of hot-dip galvanized steel plate, and a reflectivity greater than 0.75 is an ideal energy-saving building material.
The product obtained by baking with organic coating and using galvanized sheet as the substrate is galvanized color coated sheet. Due to the thin zinc layer of galvanized sheet, which usually contains 20/20g/㎡ of zinc, this product is not suitable for outdoor production of walls, roofs, etc. However, due to its beautiful appearance and excellent processing performance, it can mainly be used in household appliances, audio systems, steel furniture, interior decoration, etc.
The coating of PPGI has significant characteristics such as high aesthetics, excellent corrosion resistance and processing performance, and good adhesion. The coating has rich colors and high glossiness, which can meet the aesthetic needs of different customers. At the same time, the coating can effectively resist various factors such as atmospheric corrosion, water erosion, and chemical corrosion, improving the service life of the PPGI. In addition, the coating has good processing performance and can meet various processing accuracy and appearance requirements. Most importantly, there is a strong adhesion between the coating and the substrate, which can ensure the stability and durability of the PPGI(Prepainted galvanized steel coils) during use.
Color coated coils, as innovative products in the steel industry, have attracted much attention due to their unique colors, excellent performance, and wide range of application scenarios. With the continuous progress of technology and increasing market demand, PPGI will play a more important role in the future. It brings more possibilities and surprises to our lives with its exquisite appearance, practical performance, and environmental advantages.
