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Polyvinyl alcohol(PVA) is an excellent water-based adhesive. The general product is flake, granular or flocculent. It is not easily soluble in cold water. Heating is generally required during dissolution. After being finely pulverized and surface treated, it has better cold water dissolving performance. But because of its thermoplasticity, pulverization becomes particularly difficult. Our factory adopts a special liquid nitrogen low temperature cooling process to ensure that the powder of the crushed material is uniform. So that the material has excellent water solubility.
1).,Name: Polyvinyl alcohol
Abbreviation: PVA
2),the molecular composition and structure:
( CH3CHCOOCH3 )x ( CH2CHOH )y
in which: x + y indicates the degree of polymerization, y / (x + y) that alcoholysis degree
3),The physical and chemical properties
The physical property
A,Solubility:
The Polyvinyl alcohol powder can be dissolved in water. PVA with Less than 95% alcoholysis degree can be dissolved in water at room temperature and PVA with more than 99.5% alcoholysis degree can only be dissolved in hot water above 95c.
B,Thermal Stability:
The heat can make PVA soften and there is no significant change below 40c but 160c or more, for a long time heated ,it will gradually be colored .when 220c above it is decomposed to produce water, acetic acid, a c etaldehyde and pr o pylene aldehyde.
C,Chemical Resistance:
PVA is almost free from weak acid, weak base, or the impact of organic solvents, oil is very high.
D,Storage Stability:
PVA is a low viscosity of the polymer, the solution is stable at room temperature. Aqueous solution in the storage process is not degenerate.
E,Film:
As the high adhesion between PVA molecular, PVA is easy to form a colorless, transparent film with good mechanical strength, smooth surface without tacky, and good solvent resistance. Monolayer has excellent light-admitting quality , high permeability rate, no charged, no absorption and good printing character .
The Chemical Property
PVA can be seen as a linear polymer with a hydroxyl polymer. Hydroxyl of molecules which has high activity can be a typical chemical reaction of low-alcohol, such as esterification, etherification, ac e tal, etc and can also react with a number of inorganic compounds or organic compounds.
| Item | 1799 | 2099 | 2499 | 2699 |
| Appearance | White flake | White flake | White flake | White flake |
| Degree of alcoholysis(Mole%) | 99.0-100.0 | 99.0-100.0 | 99.0-100.0 | 99.0-100.0 |
| Viscosity(cps) | 22.0-28.0 | 35.0-43.0 | 58.0-68.0 | 68.0-78.0 |
| Volatile matter(wt%) | ≤5.0 | ≤5.0 | ≤5.0 | ≤5.0 |
| Purity(wt%) | ≥93.5 | ≥93.5 | ≥93.5 | ≥93.5 |
| Ash(wt%) | <0.7 | <0.7 | <0.7 | <0.7 |
| PH value | 5-7 | 5-7 | 5-7 | 5-7 |
1) In textile industry ,PVA is mainly used as a warp dressing agent, textile finishing agent and the raw material of vinylon.
2) In construction and upholstery industry 107 gule, it's used as an additive of cement and mortar, inner and outer wall paints, and moulding board binder;
3) In chemical industry, It's used as a polymer emulsifying agent, dispersing agent and used to produce PVA for-mal, PVA a-cetal and PVA butyral.
4) It's used as an adhesive in lumbering and paper-marking industies.
5) Used as a soil improving agent, pesticide reinforcing agent and PVA thin film in agriculture.
5)Used as a well-fixing agent in pertroleum exploitation .
6)It can also be used into cosmetic, medicine, printing, ceramics ,steel-marking, electronics and plating.
1.Packing:
In 25kg PP woven bag, or per your requirement.17-20mt/20'FCL 24-28mt/40'FCL
2.Storage:
The resin should be stored in a drafty, dry warehouse and away from fire and direct sunlight. It should not be piled up in the open air.
3.Transportation:
During transportation, the product should not be exposed to strong sunlight or rain and should not be transported together with sand, soil, scrap metal, coal or glass. Transportation together with toxic, corrosive and flammable substance is strictly prohibited.
Our Main Products:
1.Quality Assurance. The compancy has advanced and complete facilities of the laboratory, testing room, color room, to ensure the quality of products.
2.Professional Service. We can serve you in 7/24 hours whole year, professional technical communication and recommend the most suitable material for you.
1. Delivery time
a) For the stock items, we can arrange the shippment within 2~3 days after received your payment. For the customized items, we will indicate the delivery time in the quotation list.
2. MOQ&Shipping
a) Full containers by sea
b) Small quantity(>25kg), by air or by LCL or by Express as your requirement
3. Payment term
a) Small quantity recommend West Union
b) Full containers recommend T/T or L/C
4.How is the charge for sample?
Please feel free to negotiate with us.
5. Can you give warranty of your products?
Yes, we extend a 100% satifisfaction guarantee on all items. Please feel free to provide timely feedback if you're not satisfied with our Quality and Service. For the overseas orders, if there is a quality problem, please kindly to provide the picturers to show the problem by e-mail.
6.Can I visit your factory?
Sure, warm welcome. If you have visiting plan, please contact us to make an appointment in advance.
