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Main adhesive types and Applications
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According to incomplete statistics, so far more than 6000 kinds of adhesive products come out, because of its variety, different components, there is no uniform classification method.
Urea formaldehyde resin, phenolic aldehyde, melamine formaldehyde adhesive: mainly used in wood processing industry, the use of formaldehyde emissions higher than international standards.
Polyacrylic acid resin: mainly used in the production of pressure-sensitive adhesive, also used in textile and construction field. In recent years, domestic enterprises introduced several pressure sensitive adhesive production lines from abroad, which promoted the development of domestic polyacrylic acid resin production technology.
Polyurethane adhesive: can bond a variety of materials, after bonding at low temperature or ultra-low temperature can still maintain the physical and chemical properties of materials, mainly used in shoes, packaging, automotive, magnetic recording materials and other fields. In recent years, the domestic polyurethane adhesive production increased by an average of 30%. There are now about 170 factories in China producing more than 100 kinds of adhesives of different specifications.
Hot melt adhesive: according to different materials, can be divided into EVA hot melt adhesive, polyamide hot melt adhesive, hot melt adhesive, hot melt adhesive polyester polyolefin etc.. At present, the production and use of EVA hot melt adhesive. The main raw material of polyolefin series adhesive is ethylene series, SBS, SIS copolymer.
Epoxy adhesive: can be metal and most non-metallic materials between bonding, widely used in construction, automotive, electronics, electrical appliances and daily household goods. Domestic production of epoxy resin adhesive factory has more than and 100, distributed more dispersed, annual output of about 10 thousand tons.
Silicone adhesive is a kind of sealing adhesive, has the characteristics of cold and heat resistance, aging resistance, waterproof, moisture-proof, expansion of high fatigue strength, small permanent deformation, non-toxic etc.. In recent years, the rapid development of such adhesives in China, but now some of the raw materials of China imported silicone adhesive.
Synthetic adhesive: mainly used in wood processing, construction, decoration, automotive, footwear, packaging, textiles, electronics, printing and other fields of binding. At present, China's annual imports of nearly 200 thousand tons of synthetic adhesives, including varieties of hot-melt adhesive, silicone sealant, polyacrylate adhesive, polyurethane adhesive, PVC plastic adhesive can be used car etc.. At the same time, the annual export of synthetic adhesives about 20 thousand tons, mainly polyvinyl acetate, polyethylene acid formaldehyde and pressure-sensitive adhesive.
Adhesives for wood processing: medium density fiberboard, gypsum board, plywood and particleboard etc..
Adhesive for construction: mainly used in building engineering decoration, sealing or structural bonding between. With the development of the construction industry, the development of high-rise buildings, interior decoration needs, the rapid increase in the amount of adhesives used in construction. China's building adhesives consumption of about 600 thousand tons. But experts believe that China's adhesive product structure needs to be adjusted. In China, the architectural adhesives such as polyvinyl acetate, polyacrylic acid, VAE emulsion and so on can basically meet the needs, but the construction of sealing adhesives, structural adhesives need to be imported from abroad.
Sealing adhesive: mainly used for doors, windows and prefabricated prefabricated parts of the connection. In the past as a sealant with tung oil and lime mixing, now provides more than two storey buildings must use synthetic adhesives. High grade sealing adhesive is silicone and polyurethane adhesive, medium grade chloroprene rubber adhesive, polyacrylic acid, etc.. In our country, on the market for building adhesives, silicone adhesives, polyurethane sealing adhesive should be the direction of future development, the building occupies about 30% of the sales of sealing adhesive.
Adhesive for building structures: mainly used for connection between structural units. Such as the external repair of reinforced concrete structures, metal reinforcement and fixed construction site construction, generally consider the use of epoxy resin series adhesive.
Automotive adhesive: divided into 4 kinds, namely car body, interior decoration, windshield and chassis chassis adhesive. At present our country automobile adhesive consumption is about 40 thousand tons, which is the largest volume of PVC plastic adhesive, chloroprene rubber adhesive and asphalt adhesive.
Adhesives for footwear: annual consumption of about 125 thousand tons, of which chloroprene rubber adhesive needs to be about 110 thousand tons, polyurethane adhesive about 15 thousand tons. Because chloroprene rubber adhesive need benzene as solvent, and benzene harmful to human body, should limit development, so in order to meet the development needs of the footwear industry, using polyurethane series adhesive will be the direction.
Packaging adhesive: mainly used in the production of pressure-sensitive tape and pressure-sensitive labels on paper, plastic, metal and other packaging materials surface adhesion. Adhesive for packaging material of paper is polyvinyl acetate emulsion. Plastic and metal packaging material with adhesive for polyacrylic emulsion and VAE emulsion, polyurethane adhesive and cyanoacrylate adhesive.
Electronic adhesives: less consumption, the current year is less than 10 thousand tons, mostly used in integrated circuits and electronic products, mainly with epoxy resin, unsaturated polyester resin, silicone adhesive. Sealing adhesive for 5 micron thick electronic components can be supplied by ourselves, but adhesive for electronic components with a thickness of 3 microns should be imported from abroad. |
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