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Pharmaceutical grade polyvinyl alcohol 1788cas9002-89-5Use[9002-89-5] This product is obtained by adding lye in methanol solution of polyvinyl acetate for alcoholysis reaction.
The molecular formula is (CH2CHOH)n(CH2CHOCOCH3) m represents, where m+n represents the average degree of polymerization, and m/n should be 0 to 0.
35
.
The average molecular weight of this product should be 20,000 to 220,000
.
【Properties】This product is white to slightly yellow powder or translucent granules
.
This product is soluble in hot water, almost insoluble in ethanol or acetone
.
Acid value Take 10g of this product, accurately weigh it, put it in a round-bottomed flask, add 250ml of water, heat under reflux for 30 minutes under constant stirring, and let it cool under constant stirring
.
Precisely measure 50ml and measure according to the law (general rule 0713), the acid value is not greater than 3.
0
.
[Identification] Take this product and measure it according to infrared spectrophotometry (general rule 0402).
There should be characteristic absorption peaks at 2940cm-1±10cm-1 and 2920cm-1±10cm-1 wavenumbers
.
White granules or powder
.
Water soluble or only swellable
.
Resistant to mineral oils, greases, lubricants and most organic solvents
.
Hygroscopic
.
It does not melt when heated, and decomposes at about 150 ° C, and the color turns yellow
.
Polyvinyl alcohol degrades slowly at 100°C and rapidly at 200°C; polyvinyl alcohol is stable to light
.
Degrades in strong acids, softens or dissolves in weak acids and bases
.
Contact with strong oxidants can cause fire and explosion
.
Dust and air can form explosive mixtures
.
The degree of polymerization and the degree of alcoholysis are the two major factors that determine its physical properties
.
The grades and specifications of EG for medical use, and the application of the EG system
.
Pharmaceutical grade polyvinyl alcohol, different from chemical grade polyvinyl alcohol, is a very safe polymer organic compound with good biocompatibility, especially in medical applications such as its water-based gel in ophthalmology, wound dressings and artificial joints There are a wide range of applications in terms of polyvinyl alcohol films, as well as pharmaceutical films
.
Its safety can be seen in products used for wound skin repair, and eye drops
.
Some of these models are also often used in facial masks, facial cleansers, lotions and lotions in cosmetics, and are a commonly used safety film-forming agent
.
The molecular formula is (CH2CHOH)n(CH2CHOCOCH3) m represents, where m+n represents the average degree of polymerization, and m/n should be 0 to 0.
35
.
The average molecular weight of this product should be 20,000 to 220,000
.
【Properties】This product is white to slightly yellow powder or translucent granules
.
This product is soluble in hot water, almost insoluble in ethanol or acetone
.
Acid value Take 10g of this product, accurately weigh it, put it in a round-bottomed flask, add 250ml of water, heat under reflux for 30 minutes under constant stirring, and let it cool under constant stirring
.
Precisely measure 50ml and measure according to the law (general rule 0713), the acid value is not greater than 3.
0
.
[Identification] Take this product and measure it according to infrared spectrophotometry (general rule 0402).
There should be characteristic absorption peaks at 2940cm-1±10cm-1 and 2920cm-1±10cm-1 wavenumbers
.
White granules or powder
.
Water soluble or only swellable
.
Resistant to mineral oils, greases, lubricants and most organic solvents
.
Hygroscopic
.
It does not melt when heated, and decomposes at about 150 ° C, and the color turns yellow
.
Polyvinyl alcohol degrades slowly at 100°C and rapidly at 200°C; polyvinyl alcohol is stable to light
.
Degrades in strong acids, softens or dissolves in weak acids and bases
.
Contact with strong oxidants can cause fire and explosion
.
Dust and air can form explosive mixtures
.
The degree of polymerization and the degree of alcoholysis are the two major factors that determine its physical properties
.
The grades and specifications of EG for medical use, and the application of the EG system
.
Pharmaceutical grade polyvinyl alcohol, different from chemical grade polyvinyl alcohol, is a very safe polymer organic compound with good biocompatibility, especially in medical applications such as its water-based gel in ophthalmology, wound dressings and artificial joints There are a wide range of applications in terms of polyvinyl alcohol films, as well as pharmaceutical films
.
Its safety can be seen in products used for wound skin repair, and eye drops
.
Some of these models are also often used in facial masks, facial cleansers, lotions and lotions in cosmetics, and are a commonly used safety film-forming agent
.
