News Details
Anhydride class coating crosslinking agent
2017-3-16 16:49:07
Anhydride class coating crosslinking agent,Dibasic acid and anhydride maleic anhydride, phthalic anhydride can be cross-linked epoxy resin, but it must be baked at high temperatures to crosslinking completely. Anhydride first react with hydroxyl groups of epoxy resin generated monoester, the carboxyl monoester addition esterification and into double ester with epoxy group.
Anhydride is a oxyacid off a molecule of water or a few molecules of water, the rest part. General inorganic acid is a member of the acid, lose a molecule of water is directly form the acid anhydride, its decide acid anhydride the combining power of the elements of the same. And organic acid is more than two molecules of the acid or molecules of the acid by intermolecular dehydration reaction. Only oxygen acid anhydride. There is no anhydride of anaerobic acid.
Acid anhydride is considered to be a general by dehydration of oxide (organic acid anhydride do not belong to the oxide). Many can function as the original acid with water. According to the nature of the acid can be divided into: (1) the inorganic acid anhydride, shrink by one or two acid molecules. Such as carbon (acid) anhydride is carbon dioxide, CO2 (acid) anhydride nitrate nitrogen N2O5 pentoxide. (2) organic acid anhydride, made up of two unary acid molecules or shrink and become a dibasic acid molecules compounds, is not oxide, also known as acid anhydride. Such as b (acid) anhydride (CH3CO) 2 o, C8H4O3 phthalic anhydride, etc.
"Anhydride is acidic oxides" this sentence in a certain range is right. Acid anhydride is dehydrated to form, and acidic oxides to react with bases to form salts and water oxide, look from the concept, the two are not equal. Anhydride in inorganic chemistry is the formation of acid dehydration, and the vast majority of oxide, so they can be equal, but in organic chemistry, many organic acids are not oxide after dehydration, such as acetic acid (CH3COOH), dehydrated to form acetic anhydride ((C4H6O3, (CH3CO) 2 o), so it can't be acidic oxides.
H4SiO4 anhydride is SiO2, because H4SiO4 is equivalent to H2SiO3 · H2O, combined with water is "plugins", can be directly take off without tube. As alum KAl (SO4) 2 · h2o, the combined water can be directly omit. Although in the chemical formula, is just a "plugins", is to wear clothes.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
Dibasic acid is an acid molecules can knock off two hydrogen ions and acid. Including inorganic oxygen free acid, inorganic oxygen acid and organic acid. Acid such as sulfuric acid, selenium, metasilicic acid, oxalic acid, etc.
Maleic anhydride and maleic anhydride or filtration apple anhydride, often referred to as "maleic anhydride. Colorless crystalline, with a strong pungent odor, freezing point 52.8 ℃, boiling point 202 ℃, is easy to sublimation. Is mainly composed of four fractions of benzene or carbon is made by oxidation of butane and butene, is the production of unsaturated polyester and synthetic organic materials.
Maleic anhydride soluble in ethanol, ether and other organic solvents, soluble in petroleum ether and carbon tetrachloride. Generate maleic acid with hot water. Easy to alkene monomer for copolymerization reaction; Also can undertake homopolymerization. Unsaturated polyester, and glycol reacts linear reaction with sulfur trioxide formation sulfonated maleic anhydride.
Phthalic anhydride, phthalic anhydride for short, is phthalic acid molecular dehydration in the formation of the cyclic anhydride. Phthalic anhydride is white solid, it is an important raw material in chemical industry, especially for the manufacture of plasticizer.
Phthalic anhydride reaction can happen hydrolysis, alcohol solution and ammonia solution, and aromatic hydrocarbons reaction synthesis of anthraquinone derivatives. Phthalic anhydride in industry is under five vanadium oxide catalyst, composed of naphthalene with air in 350 ~ 360 ℃ was prepared by gas phase oxidation and air oxidation of o-xylene is also available. Phthalic anhydride can be used instead of phthalic acid, the main reaction with one yuan alcohol ester formation, such as phthalic acid, dibutyl phthalate ester.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Anhydride is a oxyacid off a molecule of water or a few molecules of water, the rest part. General inorganic acid is a member of the acid, lose a molecule of water is directly form the acid anhydride, its decide acid anhydride the combining power of the elements of the same. And organic acid is more than two molecules of the acid or molecules of the acid by intermolecular dehydration reaction. Only oxygen acid anhydride. There is no anhydride of anaerobic acid.
Acid anhydride is considered to be a general by dehydration of oxide (organic acid anhydride do not belong to the oxide). Many can function as the original acid with water. According to the nature of the acid can be divided into: (1) the inorganic acid anhydride, shrink by one or two acid molecules. Such as carbon (acid) anhydride is carbon dioxide, CO2 (acid) anhydride nitrate nitrogen N2O5 pentoxide. (2) organic acid anhydride, made up of two unary acid molecules or shrink and become a dibasic acid molecules compounds, is not oxide, also known as acid anhydride. Such as b (acid) anhydride (CH3CO) 2 o, C8H4O3 phthalic anhydride, etc.
"Anhydride is acidic oxides" this sentence in a certain range is right. Acid anhydride is dehydrated to form, and acidic oxides to react with bases to form salts and water oxide, look from the concept, the two are not equal. Anhydride in inorganic chemistry is the formation of acid dehydration, and the vast majority of oxide, so they can be equal, but in organic chemistry, many organic acids are not oxide after dehydration, such as acetic acid (CH3COOH), dehydrated to form acetic anhydride ((C4H6O3, (CH3CO) 2 o), so it can't be acidic oxides.
H4SiO4 anhydride is SiO2, because H4SiO4 is equivalent to H2SiO3 · H2O, combined with water is "plugins", can be directly take off without tube. As alum KAl (SO4) 2 · h2o, the combined water can be directly omit. Although in the chemical formula, is just a "plugins", is to wear clothes.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
Dibasic acid is an acid molecules can knock off two hydrogen ions and acid. Including inorganic oxygen free acid, inorganic oxygen acid and organic acid. Acid such as sulfuric acid, selenium, metasilicic acid, oxalic acid, etc.
Maleic anhydride and maleic anhydride or filtration apple anhydride, often referred to as "maleic anhydride. Colorless crystalline, with a strong pungent odor, freezing point 52.8 ℃, boiling point 202 ℃, is easy to sublimation. Is mainly composed of four fractions of benzene or carbon is made by oxidation of butane and butene, is the production of unsaturated polyester and synthetic organic materials.
Maleic anhydride soluble in ethanol, ether and other organic solvents, soluble in petroleum ether and carbon tetrachloride. Generate maleic acid with hot water. Easy to alkene monomer for copolymerization reaction; Also can undertake homopolymerization. Unsaturated polyester, and glycol reacts linear reaction with sulfur trioxide formation sulfonated maleic anhydride.
Phthalic anhydride, phthalic anhydride for short, is phthalic acid molecular dehydration in the formation of the cyclic anhydride. Phthalic anhydride is white solid, it is an important raw material in chemical industry, especially for the manufacture of plasticizer.
Phthalic anhydride reaction can happen hydrolysis, alcohol solution and ammonia solution, and aromatic hydrocarbons reaction synthesis of anthraquinone derivatives. Phthalic anhydride in industry is under five vanadium oxide catalyst, composed of naphthalene with air in 350 ~ 360 ℃ was prepared by gas phase oxidation and air oxidation of o-xylene is also available. Phthalic anhydride can be used instead of phthalic acid, the main reaction with one yuan alcohol ester formation, such as phthalic acid, dibutyl phthalate ester.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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