- Category :
Other Chemicals
- CAS NO : 9002-89-5
- EC NO :
- Molecular Formula : (C2H4O)n
- Main Specifications :
- Synonyms : PVA;polyvinyl alcohol 28-99;polyvinyl alcohol 3-98;polyvinyl alcohol 18-88;polyvinyl alcohol standard 200000;polyvinyl alcohol 15000;polyvinyl alcohol 22000;polyvinyl alcohol 49000;polyvinyl alcohol 72000;polyvinyl alcohol 100000;MOWIOL 4-88;poly(1-hydroxyethylene);POLYVINYL ALCOHOL (PVA);Polyvinyl alcohol (Release agent);POLYVINYLIC ALCOHOL;Vinyl alcohol - polymerised;Polyvinyl alcohol;Polyvinyl alcohol 175050;Polyvinyl alcohol film;
Molecular Structure:
Product description:
一、Name: Polyvinyl alcohol
Abbreviation: PVA
二、the molecular composition and structure:
( CH3CHCOOCH3 )x ( CH2CHOH )y
in which: x + y indicates the degree of polymerization, y / (x + y) that alcoholysis degree
三、The physical and chemical properties
1、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 95℃.
B、Thermal Stability:
The heat can make PVA soften and there is no significant change below 40℃ but 160 ℃ or more, for a long time heated ,it will gradually be colored .when 220℃ above it is decomposed to produce water, acetic acid, acetaldehyde and propylene 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 .
2、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, acetal, etc and can also react with a number of inorganic compounds or organic compounds.
四、Package, Transport and Storage: Appearance:Floc , Flake, Powder.
A、12.5 kg, 20 kg, 25 kg plastic woven bag or paper bag, 750Kg ~ 1000Kg woven tons of bags.
B、Transport using a clean conveyance to prevent moisture, rain and sun and moving gently to prevent the packaging scratch or smashes.
C、Stored in a dry, well-ventilated room at room temperature 5-30℃. Do not close to the heat, prevent moisture and avoid sun exposure. Prohibit deposit with volatile chemicals to prevent deterioration absorption.
D、The products are non-dangerous, no explosions, no oxidation, no corrosion, non-radioactive, and non-toxic. The safety data sheets can be given according to the customer’s requirements.