Polyvinyl Alcohol prepared for spinning synthetic materials such fibers will be obtained by formaldehyde treatment Polyvinyl formal fibers, China said Villeneuve, said vinylon internationally. Low molecular weight Polyvinyl Alcohol as a raw material obtained by spinning fibers are water-soluble, Water-Soluble Polyvinyl Alcohol Fiber known. General Polyvinyl Alcohol Fiber does not have the necessary resistance to hot water, the practical application of little value. Polyvinyl formal fiber has a soft, warm, and other properties, especially the moisture absorption rate (up to 5%) in the various varieties of synthetic fibers is relatively high, it is known synthetic cotton; but its poor heat resistance, softening point, only 120 ℃.
20 early 1930s, the German chemical company Wacker first obtained Polyvinyl Alcohol Fibers. 1939, Japanese cherry Ichiro, Yazawa the United Kingdom, Korea Lee Seung Gi will this fiber treated with formaldehyde to prepare polyvinyl formal water resistant fiber, 1950 by Japan Kurashiki Rayon Company (now Kuraray company) built industrial production equipment. 1984 world production of Polyvinyl Alcohol Fiber 94kt. Early 1960s, Japanese companies and Kuraray Vinylon produced water-soluble Polyvinyl Alcohol Fiber market.
Polyvinyl Alcohol Fibers used in the Polyvinyl Alcohol material to 150,000 average molecular weight of 60,000, the thermal decomposition temperature of 200 to 220 ℃, a melting point of 225 ~ 230 ℃. Polyvinyl Alcohol Fibers may be wet spinning and dry spinning. The Polyvinyl Alcohol Fiber after heat treatment can be obtained by acetalization of polyvinyl formal fibers. Acetalization process is Glauber tow was washed with water (sodium sulphate) was removed from the solution of the aldehyde (formaldehyde, an aldehyde agent, diluent water, the catalyst sulfuric acid, the swelling agent is sodium sulfate resistance) through, then washed process. The tow may be cut into staple fibers, the air stream delivered to the processor in a stainless steel line for acetalization. To improve the fiber performance, Polyvinyl Alcohol solution containing boric acid crosslinking agent (concentration 16%) were wet spinning, spun fibers resulting in an alkaline coagulation bath coagulation, neutralized, washed and multi-stage high power stretch and heat treatment, the available strength of 106 ~ 115cN / dtex filament. This product is called boron wet filament.
Performance:
1. PVA Fiber has good mechanical properties, high strength, high modulus, low elongation.
2. Acid and alkali resistance, chemical resistance.
3. Light resistance: In the long sunshine, fiber strength loss is low.
4. Corrosion resistance: fiber buried underground for a long time not moldy, no rot, no insects.
5. It has a good dispersion fiber: fiber non-stick, water, good dispersion.
6. Fiber and cement, plastics and other affinity, high adhesive strength. 7. Non-toxic and harmless to humans and the environment..