Urea-formaldehyde resin (UF), also known as urea-formaldehyde resin, is a polycondensation of urea and formaldehyde under the action of a catalyst (alkaline or acid catalyst) to form an initial urea-formaldehyde resin, and then under the action of a curing agent or auxiliary agent to form an insoluble and insoluble final stage Thermosetting resin. The cured urea-formaldehyde resin is lighter in color than phenolic resin, translucent, resistant to weak acid and alkali, has good insulation performance, excellent wear resistance, and is cheap. It is the most used type of adhesive, especially in the wood processing industry. In the manufacture of various wood-based panels, urea-formaldehyde resin and its modified products account for about 90% of the total amount of adhesives. However, urea-formaldehyde resin is easily decomposed in the presence of strong acid and strong alkali, and has poor weather resistance, poor initial viscosity, large shrinkage, high brittleness, water resistance, and easy aging. The wood-based panels produced with urea-formaldehyde resin have formaldehyde release in the process of manufacturing and use. problem, so it must be modified.
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At present, the domestic drying equipment is dominated by customers with medium and low-end products, and there is a big gap compared with foreign countries. Products need to be upgraded and it is indispensable to increase technology research and development efforts. The high-end products have become the direction of the development of drying equipment. Enterprises should adjust the product structure, learn advanced foreign technologies, develop and produce high-performance, low-cost, large-scale complete sets of equipment and high-tech products that meet the needs of production and sales, and change the status of low-tech-based products.
With the increasing popularity of energy-saving and environmental protection, energy-saving and environmental protection of drying equipment has attracted the attention and attention of everyone. Vacuum drying technology and microwave drying technology have a very good energy-saving effect. The development of the drying equipment industry can only take the right path of development if it chooses the right direction of development.
The benign development of the drying equipment industry in China. First, we must speed up the establishment of a standard system. Standards will regulate the internal management of enterprises. There are quantitative indicators in the standards. Second, when companies design and manufacture drying equipment, they must combine the equipment and process, and determine the equipment structure according to the nature of the materials. Again, the number of companies is not necessarily large, but companies must have a certain scale and technical level.
The benign development path of China's drying equipment industry
In recent years, China's drying equipment industry has accelerated its development, and small and medium-sized drying equipment manufacturing companies have established a foothold in the market, and competition in the industry has become increasingly fierce.