Square Powder Coated Aluminium Extrusions For Led Strip Lighting Corrosion Resistance

Since the early 1970 s, powder coatings, powder coatings for entirely without solvent, all can be converted to coating, coating of high efficiency and comprehensive protection and decorative performance is good wait for an advantage, extensive attention all over the world, so as to obtain rapid development. Metal profile in the hope of excellent durability, decorative and the characteristics of processing formability, widely used in all aspects of the building. The aluminum because of its good processing properties, the characteristics of light weight, consumption accounts for more than 80% of metal material. The application of powder coatings in the field of aluminum has been growing rapidly. At present, the powder coating on aluminium profile application has expanded from Europe to the americas, Australia, far east, the Middle East and Africa.

At present, the aluminum surface treatment generally exist in anodic oxidation, electrophoresis painting and powder coating processing mode of three kinds of every kind of way has its advantages, occupies considerable market share. In aluminum coating, powder coating of representative varieties are epoxy, polyester, acrylic and silicone resin powder coatings, etc., as an application, such as part of the aluminum frame, door window, balcony, corridor, partition panel contour anticorrosive aluminium profile, most use polyester, acrylic powder coating, in addition, because of the epoxy resin powder coating with excellent adhesion and anti corrosion, but the weather is bad, so commonly used in indoor or used as a primer.

The type and performance of the aluminum profile powder coating

Has often used in powder coating of aluminum of weather resistant polyester powder coatings, powder coatings with mostly saturated polyester resin type, we usually according to its basic structure can be divided into two categories, end carboxyl and end hydroxyl groups.

The number of the ends of the carboxylic acid group is between 2000 and 8000, and the acid value is from 20 to 100 mgKOH/g. Among them, the medium and high acid value (45-85) is commonly used in epoxy/polyester blended powder coating, in the low acid value (20-45) with three different melamine urea acid polyester glycidyl ester (TGIC), hydroxy amide as curing agent for the preparation of permanent excellence of pure polyester powder coating.

The polyester/TGIC powder coating can be classified according to the Florida natural exposure test results, which can be divided into three types:

1) standard resistant powder coating (available in Florida for 1 to 2 years)

2) improved resistant powder coatings (available in Florida for 2 to 3 years)

3) super resistant type resistant powder coating (available for more than 5 years in Florida)