MDI formaldehyde free plywood
Guide: In the modern wood-based panel industry, MDI technology is rapidly becoming a solution of “formaldehyde free addition”.
The application of MDI in the OSB continuous production line is relatively mature, and a certain amount of equipment transformation is required for multi-layer lines and single-layer lines.
Plywood is one of the commonly used materials in furniture manufacturing and one of the three major wood-based panels.
In recent years, plywood has gradually become the leading product in China’s wood-based panels. At the same time, it is also the earliest and fastest growing wood-based panel with strong international competitiveness. Formaldehyde content in plywood has always been the focus of consumers. As we all know, in the furniture industry, the formaldehyde content of plywood almost depends on the use of adhesives. The more adhesive is used, the higher the aldehyde content of the board is, because the adhesive contains formaldehyde. In the market, the adhesives used for plywood are generally urea formaldehyde resin adhesive and phenolic resin adhesive. These conventionally used adhesives will release a certain amount of formaldehyde during use. Traditional adhesive urea formaldehyde resin adhesive urea formaldehyde resin adhesive is a kind of thermosetting polymer adhesive developed earlier. Because of its simple process, cheap raw materials, high bonding strength, colorless and transparent, it is widely used in plywood, particleboard, fiberboard and other wood-based panels. However, the formaldehyde emission of urea formaldehyde resin adhesive is high, which pollutes the environment and poses a threat to health. Phenolic resin adhesive Phenolic resin is the general name of resin formed by phenols and aldehydes under the action of catalyst, and is one of the main adhesives widely used in the wood processing field. It has high bonding strength, aging resistance, heat resistance and water resistance. However, it is brittle and easy to peel, so it is not suitable for use as structural adhesive, and its curing time is relatively long. White emulsion white emulsion is a water-soluble adhesive, which is one of the most widely used and used adhesives. White latex can be divided into ordinary white latex and new composite white latex. The white emulsion can be cured at room temperature, and the curing speed is fast; The adhesive strength is high, and the adhesive layer has good toughness, durability and is not easy to age. However, the water resistance and moisture resistance of white latex are relatively poor, and it is easy to absorb moisture in humid air; Creep will occur when used at high temperature, thus reducing the bonding strength. Therefore, under the development of formaldehyde free environment, MDI adhesive came into being, which led to the emergence of MDI formaldehyde free board. What is MDI? The full name of MDI is isocyanate adhesive, or MDI adhesive for short. It is a dark red brown liquid product. MDI is a frontier polymer synthetic material widely used, with excellent safety and stability. Because of these characteristics, MDI is even used in the manufacture of artificial organs such as artificial blood vessels and heart valves. Therefore, MDI does not contain any formaldehyde. People often mistake MDI technology as a new technology in the industry. In fact, in the global OSB manufacturing field, MDI has been widely used for many years. In the modern wood-based panel industry, MDI technology is rapidly becoming a solution of “formaldehyde free addition”. The application of MDI in the OSB continuous production line is relatively mature, and a certain amount of equipment transformation is required for multi-layer lines and single-layer lines. In addition to formaldehyde free addition, compared with traditional adhesives, MDI has less sizing and shorter hot pressing time to achieve the same adhesive effect, which means that MDI is competitive in price and performance under the same output. MDI formaldehyde free board MDI formaldehyde free board is an environment-friendly board made of isocyanate adhesive that does not release formaldehyde. Isocyanate adhesive itself has strong polarity and active type, which can react with wood and water in wood. Therefore, MDI formaldehyde free plate has high bonding strength and good water resistance. Compared with the adhesives used in traditional wood-based panels, MDI formaldehyde free panels use less adhesive content and shorter hot pressing time under the same adhesive effect. The base material of MDI formaldehyde free board not only has zero formaldehyde release, but also has zero benzene and TVOC release, causing zero harm to human health. The environmental protection level of MDI formaldehyde free board reaches 0.02mg/L-0.04mg/L, which is far superior to the national E0 level environmental protection standard, and also superior to the American NAF level environmental protection standard.
