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The classification, advantages and disadvantages of popular science polyurethane manufacturers were discussed

2019-07-29

PU product classification




Polyurethane products mainly include the following: foam plastics, elastomer, fiber plastics, fiber, leather shoes resin, paint, adhesive and sealant, among which foam plastics account for a significant proportion.




Polyurethane foam




Polyurethane foam is divided into two kinds: hard foam and soft foam, with excellent elasticity, elongation, compression strength and softness, as well as good chemical stability. In addition, polyurethane foam plastics have excellent processing, adhesion, thermal insulation and other properties, belonging to the excellent performance of the buffer material. [4]




Polyurethane production has spread throughout North America. It is reported that the overall average annual growth rate of the North American polyurethane foam market is expected to reach about 6%. By 2020, growth is expected to be concentrated in residential and industrial sprayed polyurethane foam applications, as well as military applications. In addition, polyurethane will be used in the medical industry for the timely and effective treatment of wounds.




Polyurethane sealants have many excellent properties, including :(1) wide adjustable range of performance, strong adaptability; (2) good abrasion resistance; (3) high durability. (3) High mechanical strength; (4) Good bonding performance; (5) Good elasticity, excellent resilience, can be used for dynamic joints; (6) Good low temperature flexibility; (7) Good weather resistance, service life as long as 15~20 years; (8) Good oil resistance; (9) Biological aging resistance; (10) Moderate price.




Its environmental protection does not depend on the name but on the content of free pollutants, as well as the stability of its products, there is no way to answer the question of environmental protection or not.




disadvantages




The disadvantages of this material lie in its poor flame retardant performance, fast burning speed and excessive dissolved droplets in the process, which easily lead to accelerated fire spread. In addition, polyurethane produces more toxic gases when burned, mainly carbon monoxide (CO)


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