The physical properties of polyvinyl alcohol
Polyvinyl alcohol 1799 mainly refers to the degree of polymerization of it is 1500 to 2000 complete alcoholysis type, is the alcoholysis degree is equal or more than 98% mol series. The physical properties of it are as following:
Appearance: White or light yellow flake, granular solid.
Filling specific: is 0.4 to 0.5 g/ml.
Water solubility: When it in cold water, only swelling, along with rise of the water temperature dissolved gradually, the stirring condition to 95℃ can rapidly dissolve. The highest concentration in the hot water is around 16%. The solution has good film-forming properties and adhesion.
Chemical resistance: Resistance to acid, alkali and organic solvents, and with excellent oil resistance.
Thermal stability: no significant change at 40℃, to 160℃, the color becomes darker, more than 220 ℃ begins to decompose, generating water acetic aldehyde and so on.
Storage stability: the product storage stability is good, long-term storage is not moldy, not bad but its aqueous solution storage for a long time, need to add some fungicide, such as FF02 and so on.
Chemical properties of it are as following:
Chemical properties of the polyvinyl alcohol is that it is the presence of a secondary alcohol, it is similar to a certain extent of cellulose, such as its hydroxyl content and cellulose were it can of hydroxyl content in the polyol typical chemical reaction, can be enough for the esterification and etherification, can react with alkali metal aldehyde can also react with carbon disulfide and sodium hydroxide to produce the xanthate salt its aqueous solution has good adhesion and film. Oil lubricant and hydrocarbon and so on, most of the organic solvent. With a long chain of polyol ester ether acetal, such chemical properties.
1. The esterification of Polyvinyl Alcohol: Polyvinyl Alcohol can react with formylation, acetylation, and inorganic acid to produce ester. Polyvinyl alcohol in different under the action of a catalyst, can carry on the formyl and formic acid 100%. In order to prevent the destruction of large molecules, can be carried out under the mild conditions. Polyvinyl alcohol acetylation, is in pyridine and acetic anhydride, also can with acetyl chloride, or zinc chloride and acetic anhydride reaction, acetylation can; Poly (vinyl alcohol) and binary anhydride reaction, can generate soluble or insoluble polymer; Polyvinyl alcohol can also react with sulfuric acid nitric acid and other inorganic acid phosphate, generate the corresponding esters.
2. The etherification of Polyvinyl Alcohol: The Etherification of Polyvinyl Alcohol, basically the same as the low molecular alcohols. Under the action of alkali, polyvinyl alcohol is reacted with sulfuric acid etherification. And polyvinyl alcohol is reacted with epoxy ethane in the presence of catalyst.
3. The acetal of Polyvinyl Alcohol: As the catalyst conditions in hydrochloric acid, polyvinyl alcohol acetal was using polyvinyl alcohol an formaldehyde reaction system.
If you have the demand for Polyvinyl Alcohol or the series products of Polyvinyl Alcohol with good price and high quality, please contact us:
Tel:0086-025-52397805
Cell:18912955102
Fax:0086-25-68650010
E-mail:[email protected]
Website:www.china-pva.net
Add:Tianchang,chuzhou,anhui province
Polyvinyl alcohol 1799 mainly refers to the degree of polymerization of it is 1500 to 2000 complete alcoholysis type, is the alcoholysis degree is equal or more than 98% mol series. The physical properties of it are as following:
Appearance: White or light yellow flake, granular solid.
Filling specific: is 0.4 to 0.5 g/ml.
Water solubility: When it in cold water, only swelling, along with rise of the water temperature dissolved gradually, the stirring condition to 95℃ can rapidly dissolve. The highest concentration in the hot water is around 16%. The solution has good film-forming properties and adhesion.
Chemical resistance: Resistance to acid, alkali and organic solvents, and with excellent oil resistance.
Thermal stability: no significant change at 40℃, to 160℃, the color becomes darker, more than 220 ℃ begins to decompose, generating water acetic aldehyde and so on.
Storage stability: the product storage stability is good, long-term storage is not moldy, not bad but its aqueous solution storage for a long time, need to add some fungicide, such as FF02 and so on.
Chemical properties of it are as following:
Chemical properties of the polyvinyl alcohol is that it is the presence of a secondary alcohol, it is similar to a certain extent of cellulose, such as its hydroxyl content and cellulose were it can of hydroxyl content in the polyol typical chemical reaction, can be enough for the esterification and etherification, can react with alkali metal aldehyde can also react with carbon disulfide and sodium hydroxide to produce the xanthate salt its aqueous solution has good adhesion and film. Oil lubricant and hydrocarbon and so on, most of the organic solvent. With a long chain of polyol ester ether acetal, such chemical properties.
1. The esterification of Polyvinyl Alcohol: Polyvinyl Alcohol can react with formylation, acetylation, and inorganic acid to produce ester. Polyvinyl alcohol in different under the action of a catalyst, can carry on the formyl and formic acid 100%. In order to prevent the destruction of large molecules, can be carried out under the mild conditions. Polyvinyl alcohol acetylation, is in pyridine and acetic anhydride, also can with acetyl chloride, or zinc chloride and acetic anhydride reaction, acetylation can; Poly (vinyl alcohol) and binary anhydride reaction, can generate soluble or insoluble polymer; Polyvinyl alcohol can also react with sulfuric acid nitric acid and other inorganic acid phosphate, generate the corresponding esters.
2. The etherification of Polyvinyl Alcohol: The Etherification of Polyvinyl Alcohol, basically the same as the low molecular alcohols. Under the action of alkali, polyvinyl alcohol is reacted with sulfuric acid etherification. And polyvinyl alcohol is reacted with epoxy ethane in the presence of catalyst.
3. The acetal of Polyvinyl Alcohol: As the catalyst conditions in hydrochloric acid, polyvinyl alcohol acetal was using polyvinyl alcohol an formaldehyde reaction system.
If you have the demand for Polyvinyl Alcohol or the series products of Polyvinyl Alcohol with good price and high quality, please contact us:
Tel:0086-025-52397805
Cell:18912955102
Fax:0086-25-68650010
E-mail:[email protected]
Website:www.china-pva.net
Add:Tianchang,chuzhou,anhui province