Polyvinyl alcohol PVA23 99 H

I don't know what you mean by curing, but formaldehyde treatment can definitely increase the initial tack. If you are interested, you can add QQ (note 2399) to discuss in detail. Or email:

Summary. Hello dear,!<

Try to use 1788 putty, because 2488 has a high viscosity and feels heavy when scraping in batches. If it is a dry powder putty, it is best to use 1788 powder of more than 120 mesh produced by the ethylene method, so that the putty will not appear small particles after grinding. Hope it helps!

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Polyvinyl alcohol 100-40 and polyvinyl alcohol 20-99h difference.

Polyvinyl alcohol 100-40 and polyvinyl alcohol 20-99h difference Hello dear,!<

10. Nahu polyvinyl alcohol 100-40h (20-99SH) Introduction: 100-40h (20-99SH) is used for the greasy and trembling-sensitive side of the interior wall, and the additive for treating the wall substrate eggplant oak to increase its roughness. Hope it helps! <>

Hello dear,!<

Try to use 1788 putty, because 2488 has a high viscosity and feels heavy when scraping in batches. For example, if Yantanguo is made of dry powder putty, it is best to use 1788 powder of more than 120 mesh produced by ethylene method, so that small particles will not appear after putty grinding. I hope I can help you!

<>If my answer is helpful to you, please give a thumbs up (comment in the lower left corner), look forward to your like, your efforts are very important to me, and your support is also my progress. Finally, I wish you good health and a good mood!

Polyvinyl alcohol is obtained by the alcoholization of polyvinyl acetate, so its degree of alcoholization is the percentage of the functional groups that have been successfully hydrolyzed to the total functional groups.

The degree of polymerization is the number of monomers in a macromolecule. Because polyvinyl alcohol is a macromolecule, this macromolecule is made up of many small molecules of vinyl acetate bonded.

Therefore, one is to measure the size of the skeleton formed, and the other is to measure the conversion rate of the product that is transformed into the desired product. The two are different.

Polyvinyl alcohol is soluble in water, insoluble in gasoline, kerosene, vegetable oil, benzene, toluene, dichloroethane, carbon tetrachloride, acetone, ethyl acetate, methanol, ethylene glycol, etc., slightly soluble in dimethyl sulfoxide.

The physical properties of polyvinyl alcohol are affected by the chemical structure, degree of alcoholism, and degree of polymerization. There are two chemical structures in the polyvinyl alcohol molecule, namely the 1,3 and 1,2 ethylene glycol structure, but the main structure is the 1,3 ethylene glycol structure, that is, the "head-tail" structure. The degree of polymerization of polyvinyl alcohol is divided into ultra-high degree of polymerization (molecular weight 25 300,000), high degree of polymerization (molecular weight 17.22 million), medium degree of polymerization (molecular weight 12.15 million) and low degree of polymerization of 2 50,000.

There are generally three degrees of alcoholism. The degree of hydrolysis is usually 87% to 89% for partial hydrolysis and 98% to 100% for complete hydrolysis. It is common to take the thousands, hundreds, and hundreds of the average degree of polymerization in front, and put the percentage of the degree of alcohololysis on the surface, such as 17 88, that is, the degree of surface polymerization is 1700, and the degree of alcohololysis is 88%.

Generally speaking, the degree of polymerization increases, the viscosity of the aqueous solution increases, and the strength and solvent resistance after film formation increase, but the solubility in water and the elongation after film formation decrease.

It can be used with water, and the solubility can reach up to 15%.

Polyvinyl alcohol can be placed in water and stirred constantly to dissolve quickly.

Alcohols are compounds that contain a hydroxyl group in a molecule that binds to a carbon atom on a side chain of a hydrocarbon group or benzene ring. According to the number of hydroxyl groups, alcohols can be divided into monoalcohols, diols, and teranols.

The nomenclature of alcohols is to add the number of carbon atoms in front of alcohol, and if there is more than one hydroxyl group, we also need to add the number of hydroxyl groups after the number of carbon atoms. If the carbon atom is between 1 and 10, it is expressed by the heavenly stem, and if it is more than 10, it is expressed by numbers, such as methanol, ethanol, propanol, vinyl alcohol, isopropanol, ethylene glycol, glycerol, etc.

The hydrogen atoms in the hydroxyl group of alcohols are particularly chemically active, and can be replaced by metals in front of hydrogen to form salts, and polyols can also react with alkalis, showing weak acidity.

Alcohols can generally be burned, emitting a light blue flame when burned.

Alcohols can also react with hydrohalic acids to form halogenated hydrocarbons under the catalysis of concentrated sulfuric acid.

Alcohols can also undergo dehydration reaction under the action of concentrated sulfuric acid, when the temperature is relatively low, its intermolecular dehydration, the formation of ether, such as ethanol dehydration to form diethyl ether, when the temperature is relatively high, after the loss of water in the molecule, the formation of unsaturated hydrocarbons, such as ethanol dehydration to form ethylene.

Vinyl alcohol is unstable and can undergo molecular rearrangement to form acetaldehyde.

I hope I can help you with your doubts.

Polyvinyl alcohol is an important chemical raw material, which is used in the manufacture of polyvinyl alcohol acetal, gasoline-resistant pipes and vinylon synthetic fibers, fabric treatment agents, emulsifiers, paper coatings, adhesives, etc.

I haven't heard of the model PVOH771-83 polyvinyl alcohol, I don't know who has heard of it, I know that polyvinyl alcohol is divided into hot and cold water, flocculent, powdery, flaked, granules, and divided into models, 88 models, and 99 models

1.PVA (polyvinyl alcohol) with 90% hydrolysis

The degree of alcohololysis of PVA-124 is 98 99%, and the degree of polymerization is about 2400The molecular weight of chondroitin sodium (chondroitin) is generally 2-50,000, and sodium chondroitin should be a white powder, with strong water absorption, soluble in water and a viscous solution, insoluble in ethanol, ether, acetone and other organic solvents. Its chemical composition is a polymer of D-glucuronic acid and acetaminohexose (glucose and galactose) linked by 1,3-b--glycosidic bonds