PVA MANUFACTURER---LIWEI CHEMICAL CO. LTD

Biodegradation and Application of Polyvinyl Alcohol PVA Size

Polyvinyl alcohol (PVA) is one of the common water-soluble polymers. The molecular chains in the main chain, with one hydroxyl group on each repeat unit, because of the hydroxyl group sizes small, polarity, and easily form hydrogen bonds, Polyvinyl Alcohol PVA has a good solubility in water, film, adhesive and emulsification, good oil resistance and chemical resistance and low toxicity.
Since 1939, by United States first DuPont production, has been widely used in adhesives, finishing and sizing agents in papermaking, textile sizing, hotan chemicals, pharmaceuticals, food packaging, etc. In the last century, the world supply and demand more than 500,000 tons per year. PVA production in China began in the 1960 of the 20th century, the rapid development of both production and apparent consumption of currently leads the world in the first place.
As synthetic staple fibres and fine count high density fabric warp main paste, PVA has been most widely used. In warp enhancements, wear-resistant, reducing elongation comprehensive indicators, there have not been any kind of natural or synthetic size can match. Polyvinyl Alcohol PVA's Achilles ' heel is its non-environmental protection, was second to "unclean slurry", some European countries have banned the PVA-containing slurry of imported fabric. At least a dozen years ago, people searching for a replacement for PVA sizes, but has not yet found the perfect substitute.
Browse publications on textile, you can find a considerable part of the papers involve the other pastes used alternative to PVA, sufficient proof of the level of concern. However due to the grades of total textiles and textile products increased, the use of PVA size is increasing each year. This makes the biodegradability of Polyvinyl Alcohol PVA and fate has had a keen interest in ecology.
With the development of science and textile production and technological progress, both at home and abroad a variety of sizing materials continue to emerge, a significant portion of the product is labelled as a variety of trade names, some basic ingredients or chemical composition of slurry products have clear instructions in the manual and some pulp manufacturers will paste the basic ingredients as technological and commercial secrets, its closely guarded secret. As users of the size most textile, printing and dyeing enterprises lack advanced scientific instrumentation and tools available locally and there is no authoritative testing institutions to rapid qualitative identification of effective size.