The development and usages of PVA fiber
Polyvinyl alcohol (PVA) fiber is one of the important species in synthetic and its conventional products are polyvinyl formal fiber, referred to as vinylon, mainly with short fiber.
In 1924, German Hermann and Haehnel successfully synthesized polyvinyl alcohol, and produced fiber by using its water solution after dry spining. Subsequently, Wacker company in German produced a polyvinyl alcohol fiber used for surgical suture. After the 1939, Janpanese Sakurada Ichiro, North Korea Lee Seung used the heat treatment and the acetal method successfully produced resistance to hot water excellent, low shrinkage rate, and has the practical value of PVA fiber. However, due to the interference of the Second World War, until 1950, insoluble in water, polyvinyl alcohol fiber to achieve industrial production.
Because of poor dyeing property and low elasticity of PVA fiber, in recent years, in recent years, the use of the field has been shrinking. But in industry and agriculture, fisheries and other aspects of the application has increased. In addition, the proportion of decorative use, industrial fiber and functional fiber is gradually increasing.
Its main uses are as follows. 1 fiber reinforced material The use of polyvinyl alcohol fiber strength, good impact resistance, molding process of good dispersion and so on, can be used as plastics and cement, ceramics, etc.. Especially as a carcinogenic substance -- asbestos substitute, attached great importance to asbestos plate made by the construction industry. 2 nets Using polyvinyl alcohol fiber fracture strength, impact strength and resistance to seawater corrosion, good strength, with its manufacturing various types of fishing nets, fishing gear, fishing line. 3 cable Polyvinyl alcohol fiber cable are lightweight, wear resistance, not easy to twist together, with good resistance to impact strength, weather resistance and resistance to seawater corrosion, in aquatic vehicle and ship transport has more applications. 4 canvas The polyvinyl alcohol fiber canvas has good strength, light weight, good resistance to friction and good weather resistance, which has many applications in transportation, storage, shipping, construction, and so on. In addition, polyvinyl alcohol fiber also can make packaging materials, nonwoven geotextile filter, etc.
