Polyvinyl Alcohol PVA chemical formula is [C2H4O]n, white sheet, wool or powdered solid, odorless. Physical properties of polyvinyl alcohol effects of chemical structure, alcohol sis, degree of polymerization.
Solubility: insoluble in petroleum ether, insoluble in water. Derivatives of cellulose and starch, synthetic resins, and a variety of surfactants are miscible with each other and have good stability.
At room temperature, its aqueous solution pH value is typically at around 5-7, viscosity stability, almost independent of weak acid, weak alkali or organic solvents (esters, ketones, higher alcohols, hydrocarbons) effect, extremely high oil resistance

The use of PVA
1, The vinyl raw material: polyvinyl alcohol after dissolution, spinning, and then of the acetal with Pooh fibre, it is compatible with, such as cotton, wool, viscose blend made from vinyl textiles, widely used in clothing, tarpaulin, curtain line, fishing net rope. In General, the selected average degree of polymerization of 1750 ± 50 PVA17-99 raw materials as well as spinning.
2, Warp slurry
1) dominated by PVA modulation paste, cotton, linen, polyester and vinylon viscose has a good adhesion, smooth after filming, both robust and wear-resistant, promote well-weave of warp and warps in the weaving process friction reduction, bending. Stretch warp caused by steroid such as break, reducing machine breakage rate. Feel neat and weave cloth. Smooth and delicate, oil on canvas is not rough.
2) Polyvinyl alcohol is a water-soluble polymer , mixing , sizing , desizing are very convenient
3) General election low average degree of polymerization of polyvinyl alcohol ( eg PVA15-99 ,16-99 ,17-99) as a slurry is good.

3, Binder
1) cellulose, polyvinyl alcohol 1788 water solution containing material (such as paper, cloth, wood, etc) very strong adhesion, had the advantage of safe non-toxic, can be used for Board-laminated, adhesive for corrugated board and Office with glue. Packing heavy loads such as kraft paper bags for cement, fertilizer, food and other using PVA as Binder.
2) PVA modified urea-formaldehyde resin and phenolic resin can be used as floor panels and Panel adhesives.
3) PVA water solution (by adding suitable fillers, additives) is also widely used in preparation of printing and binding, paper, carton and other paper adhesive needed for the connection.
4) and polyvinyl alcohol under acid catalysis,, butyric aldehyde, Glyoxal and formaldehyde other aldehydes or condensation, can generate more water resistance, adhesion, mechanical strength of polyvinyl-formaldehyde (such as PVAF, PVB) is widely used in safety glass sandwich construction, paints, adhesives, and other fields. PVA polymerization degree increase, Acetal viscosity increases
PVA Market
United States the main consumption areas of adhesives and textile sizing, 76% per cent of total consumption
European consumption aggregate additives, and paper coatings, 68.7% per cent of total consumption
Japan’s major consumer areas are fibers, adhesives, 72% per cent of total consumption
2012 global polyvinyl alcohol consumption of 1.184 million tons, North American consumption of 156,000 tons, per cent of the global total of 13.18%; Western European consumption of 154,000 tonnes, ratio of 13.01%; the Asia-Pacific region is the world’s largest market for polyvinyl alcohol, annual consumption of 822,000 tons, 69.43% per cent of the global total.
In recent years, the steady growth in world consumption of polyvinyl alcohol
1, Textiles: requires less abroad with or without PVA as a paste, modified starch alternative part of the PVA, PVA textile-related needs may be gradually reduced:
2,Adhesive: basic maintenance of stability, as represented by the 24 series will gradually increase with high viscosity, 17 series as the representative of the demand will be reduced:
3,Paper: gradual reduction in global demand, but on domestic products, future varieties with low polymerization degree can earn a certain amount of market share:
4, PVB: increased demand for high quality requirements;
5, Fabric: with its unique performance of high strength, high modulus fiber, as well as alternatives, such as asbestos, their demand will rise sharply;
6, Other: includes biodegradable materials, liquid-crystal display steady growth

Polyvinyl Alcohol PVA is a sort of water —soluble macromolecule polymer．It has innocuity and biodegradation excellent performance ，and completely accord with modern society requirement to environment —protection product． Its water solution has good agglutinating value and film formation ；it could resist most of organic solvent such as oil，lube ，and hydrocarbon on ；it possesses chemical property such as etherify ，a etherify ，and contact Alde Hyde ．It mainly used to manufacturing PVB ，oil —p roof pipe ，and Vinyl on fibred ；it also used as ad save for temporary protection fin and leather ，and use as glue feed for binding etc ．China has already become maxim al P VA production capacity ，yield ，and consumption country ．PVA production is almost balance account for world gross about 50 ％
Application
Due to PVA excellent performance, is currently widely used in pharmaceutical preparations, with good results, mainly used in the following aspects:
1 ) as a release agent layer forming material ;
2 ) used as the matrix in Papua paste ;
3 ) as the matrix used in gel formulations ;
4 ) as the binder system of tablets , matrix material and the drug-loaded microspheres or microcapsules or dispersion medium containing porogen.

U.S. PVA market
In recent years, changes in alcohol consumption in general are not particularly large. , In 2009 consumption was l2.20 million tons, accounting for the world’s total consumption of polyvinyl alcohol 11.58%, representing a decrease of approximately 13.47%, of which PVB on polyvinyl alcohol consumption was 41,000 tons / year, accounting for 33.61 percent of total consumption is expected 2009-2014 polyvinyl alcohol consumption in the United States will average growth rate of approximately 4.90% to the total consumption in 2014 will reach about l5.50 million tons. PVB which average annual growth rate of demand for polyvinyl maximum will reach about 10.65% , followed by adhesives, demand will reach an annual growth rate of approximately 2.90 %, while in terms of textile pulp but the demand will average about 1.75 % of the speed reduction

China PVA market
China has become the world’s largest PVA production capacity and output, but also the largest consumption country, production of about 520 000 t / a, the basic balance demand, accounting for about 50% of the world total. But the current production of varieties is relatively simple, the majority of ordinary viscosity and alcohol sis of conventional products, mainly used in construction adhesives, low-grade textile pulp and other fields.
Currently particularly high or particularly low degree , low degree of alcohol sis fine and special varieties of high production technology no major breakthrough , such products market is dominated by Japan , the United States and other manufacturers possession. China’s economic development for the PVA new product development to provide a broad space for development. According to statistics, in 2007 PVA National Statistics actual production was 500,000 t, but the annual import volume is still about 40,000 t , while imports are high in this part of PVA fine and specialty products , expensive , lucrative one . Polyvinyl alcohol consumption since 2012 the situation is more optimistic. A long time in China’s economy will maintain rapid development ask the backdrop , PVA demand will maintain steady growth.