Composite board and surface finish method thereof

Abstract

The invention provides a composite board and a surface finish method thereof, and belongs to the technical field of composite boards. The problem that an existing composite board surface finish technology cannot meet requirements on environmental protection, hardness and glossiness simultaneously is solved. The surface finish method of the composite board includes the steps: (1) spraying low-temperature cured powder on the composite board, and then baking and curing; (2) spraying water-based radiation cured coatings on the composite board, and then baking prior to curing. The finish method is environmentally friendly and free of pollution, and an obtained coating is high in surface hardness (can be more than 2H) and has optional stable glossiness (can be more than 95 degrees or less than 15 degrees). The surface of the composite board is finished via the method.

Description

technical field [0001] The invention belongs to the technical field of composite boards, and in particular relates to a composite board and a surface decoration method thereof. Background technique [0002] Synthetic board (artificial board) is a board or molded board made of wood or non-wood plants as raw materials, separated into various unit materials by mechanical processing, and glued each unit material with other additives with or without adhesive Products mainly include plywood, particleboard and medium density fiberboard. In order to make the surface layer of the composite board have higher strength, longer service life and more beautiful appearance, the surface of the composite board is generally painted or powder coated (that is, powder sprayed, such as low-temperature curing powder coating). [0003] The traditional paint spraying process is to evenly apply the paint on the surface of the workpiece in a mist form through compressed air; during the production proc...

AI Technical Summary

Problems solved by technology

[0003] The traditional paint spraying process is to evenly apply the paint on the surface of the workpiece in a mist form through compressed air; during the production process of spray paint and the subsequent use process, volatile triphenyl (toluene, xylene and benzene) as the main solvent, etc. A large amount of organic compounds (VOC) are released into the air, causing air pollution, and long-term exposure to these volatile organic compounds can cause chronic poisoning, resulting in human leukopenia, thrombocytopenia, bone marrow hematopoietic dysfunction and other diseases

The main components of water-based radiation-curable coatings are water-based radiation-curable resin and water. After spraying, the water is dried and the resin is cured to form a coating. Since it does not contain organic solvents, there will be no VOC release problem; but due to the main component of water-based radiation The solid content of the cured resin is low, which will result in poor fullness of the paint film of the pure water-based radiation-cured resin coating, low surface hardness, complicated construction process, and high cost, which cannot meet the requirements of surface decoration of synthetic boards.

The low-temperature curing powder coating of synthetic boards is to spray the powder coating on the surface of the workpiece with an electrostatic spraying machine or other powder spraying equipment. Under the action of static electricity, the powder will be evenly adsorbed on the surface of the workpiece to form a powder layer. The final coating is formed after baking, leveling, and curing; compared with the painting process, the powder itself does not contain eight heavy metals, is non-toxic, and has no harmful emissions during the powder spraying operation, so it is an environmentally friendly process. At the same time, powder spraying The formed coating is also all superior to the spray paint coating in terms of mechanical strength, adhesion, corrosion resistance, aging resistance, cost, etc., and the surface hardness of the coating can reach a level greater than 2H (pencil hardness); however, low temperature The surface gloss of the coating obtained by curing powder spraying is unstable, and the gloss is only between 15° and 50°, that is, it is not easy to obtain products with any stable gloss (especially high-gloss and low-gloss products), and low-temperature curing powder spraying There are defects in the formed coating, such as pinholes, etc., which reduce the physical and chemical properties of the decorative surface paint film

[0004] The inventor finds that there are at least the following problems in the prior art: the surface decoration method of the existing synthetic board cannot simultaneously meet environmental protection (no VOC emission), hardness (greater than 2H), arbitrary stable gloss (greater than 50 ° or lower than 15 °) requirements