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In the past 30 years, powder coating has brought revolutionary changes to the coating industry with its excellent performance, good durability and environmental protection. These characteristics are particularly obvious in the field of metal products, such as electrical appliances, automobile parts, sports goods and other metal products.

In recent years, the progress of raw materials, construction technology and curing methods has brought the possibility of powder coatings applied to thermal sensitive substrates. Powder coatings have been used in some fields which were considered impossible a few years ago.

One of the major breakthroughs is the application of MDF. MDF is a kind of artificial board made by mechanical separation and chemical treatment of wood or plant fiber, mixed with adhesive and waterproof agent, and then formed by high temperature and high pressure. Due to its low porosity and uniform surface characteristics, MDF is a very suitable substrate for powder coating. MDF products include office furniture, kitchen and bathroom cabinets, doors, lockers and display shelves, barbecue trays and assembly furniture.

Powder coating is a revolutionary change for the MDF Market. It not only has the design freedom that other painting methods can not provide, but also can provide colorful, beautiful, durable and dense coating. At the same time, the powder coating can also prevent MDF from breaking, sticking stains, water stains and scratches.

Challenges in application to thermal substrates

Some wood and wood products contain a certain amount of moisture, can conduct electricity, can be directly coated. Compressed air can be used to remove surface contaminants from wood parts that need to be ground. In order to enhance the adsorption capacity of the surface, conductive liquid can be used to pretreat to provide a conductive surface. These wood products then need to be preheated to a set temperature to help the powder coating adhere to the surface. A uniform surface temperature will help the efficiency of powder coating and the stability of the product coating. Then, the powder coating with electric charge is sprayed onto the surface of MDF with a spray gun. The main application of MDF is heat curing powder coating or UV curing powder coating

Thermosetting powder coatings rely on infrared heating, convective heating or the mixture of the two. The thermal energy makes the powder coating melt and level, and further crosslinks and solidifies to form the coating.

For special formula UV curable powder coatings, melting and leveling are separated from curing process, and only a little heat energy is needed to complete the curing process. First, the substrate is heated by infrared or convection for 2-10 minutes to melt and level the coating. Then, the substrate is placed in ultraviolet light, and the coating can be cured in a few seconds. Then, the coating can be finished by natural cooling or artificial cooling of the substrate, leaving the coating line.

Powder coatings meet the requirements of MDF products

Many office furniture manufacturers are abandoning standard shapes (such as rectangles, squares, etc.) and choosing more rounded edges and corners to make computer cables and cables better placed. In addition, manufacturers also achieve various colors and effects through surface coating.

Powder coating can meet these requirements well, while other surface treatment methods, such as edge bonding, can not fully meet the relevant requirements. In addition, powder coating can be completed in one step without multiple coating or long drying time.

Author: dede58.com