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An imidazole derivative coating crosslinking agent
2017-8-29 12:21:38
An imidazole derivative coating crosslinking agent
Veronique et al. used different imidazole and various chloro-formate reactions, and the resulting products could be used as low-temperature crosslinking agent and crosslinking promoter for epoxy resin.
For example, 100 g of bisphenol A type of glycidyl ester with formic acid benzyl ester chloride 14.5 g / 2 - phenyl imidazole reaction product mix, gel time is 6 min15s under 130 ℃, 150 ℃ under the gel time of 3 min15s, gel time of 2 min30s under 150 ℃.
Kaufman, etc with imidazole or replace imidazole containing unsaturated double bond of acrylic ester compounds addition reaction, and then with fatty acid or binary carboxylic acid neutralization reaction of imidazole or replace imidazole to preparation of adduct, these adduct products also can be used as a crosslinking agent and imidazole derivatives epoxy resin to form epoxy powder coating.
The addition of isocyanates (such as toluene diisocyanate) and the active groups of derivatives of imidazole can also be used for the crosslinking promoters of epoxy resin powder coatings.
In addition, toluene diisocyanate and 1 - (amino ethyl) - 2 - methyl imidazole adduct can be used as a system of one-component epoxy/dicyandiamide crosslinking agent of imidazole derivatives, such as epoxy 100, dicyandiamide 6 and 3.4 the adduct of the composition, 40 ℃ for 10 d viscosity didn't change, and in 170 ℃ / 6 s crosslinking.
Imidazole is between molecular structure containing two nitrogen atoms of the five yuan of aromatic heterocyclic compound, imidazole ring 1 - a nitrogen atom in the lone electron pair in annular conjugate, electron density of nitrogen atom is reduced, on the nitrogen atom of hydrogen is easy to form hydrogen ions to leave. It is acidic and alkaline, which can form salt with strong alkali.
Imidazole is more likely to have an electrophilic aromatic substitution than the other 1, 3-diazoles, and the reaction is mainly carried out on c-4 and c-5. This is because when the electrophilic reagent attacks c-2, it has a particularly unstable limit, and the resulting intermediates distribute the positive charge to the nitrogen atoms. For example, imidazole and fuming nitric acid/concentrated sulfuric acid can quickly generate a high yield of 4 (5) -nitroimidazole; However, 4, 5-dimethymidazole was nitrified under severe conditions and still could not react.
Chinese name: Diethyl toluene diamine(DETDA)
Veronique et al. used different imidazole and various chloro-formate reactions, and the resulting products could be used as low-temperature crosslinking agent and crosslinking promoter for epoxy resin.
For example, 100 g of bisphenol A type of glycidyl ester with formic acid benzyl ester chloride 14.5 g / 2 - phenyl imidazole reaction product mix, gel time is 6 min15s under 130 ℃, 150 ℃ under the gel time of 3 min15s, gel time of 2 min30s under 150 ℃.
Kaufman, etc with imidazole or replace imidazole containing unsaturated double bond of acrylic ester compounds addition reaction, and then with fatty acid or binary carboxylic acid neutralization reaction of imidazole or replace imidazole to preparation of adduct, these adduct products also can be used as a crosslinking agent and imidazole derivatives epoxy resin to form epoxy powder coating.
The addition of isocyanates (such as toluene diisocyanate) and the active groups of derivatives of imidazole can also be used for the crosslinking promoters of epoxy resin powder coatings.
In addition, toluene diisocyanate and 1 - (amino ethyl) - 2 - methyl imidazole adduct can be used as a system of one-component epoxy/dicyandiamide crosslinking agent of imidazole derivatives, such as epoxy 100, dicyandiamide 6 and 3.4 the adduct of the composition, 40 ℃ for 10 d viscosity didn't change, and in 170 ℃ / 6 s crosslinking.
Imidazole is between molecular structure containing two nitrogen atoms of the five yuan of aromatic heterocyclic compound, imidazole ring 1 - a nitrogen atom in the lone electron pair in annular conjugate, electron density of nitrogen atom is reduced, on the nitrogen atom of hydrogen is easy to form hydrogen ions to leave. It is acidic and alkaline, which can form salt with strong alkali.
Imidazole is more likely to have an electrophilic aromatic substitution than the other 1, 3-diazoles, and the reaction is mainly carried out on c-4 and c-5. This is because when the electrophilic reagent attacks c-2, it has a particularly unstable limit, and the resulting intermediates distribute the positive charge to the nitrogen atoms. For example, imidazole and fuming nitric acid/concentrated sulfuric acid can quickly generate a high yield of 4 (5) -nitroimidazole; However, 4, 5-dimethymidazole was nitrified under severe conditions and still could not react.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
The electron cloud density on midazole N - 3 is relatively high, so alkylation usually occurs first on this nitrogen atom. The product of an alkylation can be used to produce a nitrogen atom similar to pyridine, so it can be further reacted by producing imidazolate, a dialkylation.
The acylation of imidazole usually occurs on the n-3, but since the acyl is an electron base, the reaction can be controlled in the phase of unitary acylation, and the product is n-acyl imidazole.
The active hydrogen of imidazole can decompose the gril reagent, and the n-magnesium salt of imidazole is produced, and the imidazole is substituted by c-2 after isomerization. The latter is treated with iodide and can produce 1, 2-dimethyl imidazole.
The imidazole can be added to the pro-diene body, and the husband is 3-onium salt, and then the nucleophilic addition of the other molecule is the product of c-2 cyclation. For example, the reaction of 1-methyl-2-ethylimidazole with dimethyl dimethyl dimethylenedia was obtained, and it was found that 8a-ethyl-1-methyl1-1, 8-dihydromidazole and [1, 2-a] pyridine - 5, 6, 7, 8-tetrachylate.
Imidazole can be combined with histidine to bind Ni ions. In this case, imidazole can be used to elute the fusion protein with His -tag.
Imidazole can be used as a epoxy crosslinking agent, can improve the products of the bending, stretching, compression, such as mechanical properties, improve the performance of insulation, improve the chemical performance of resistance to chemicals, widely used in computers, electrical appliances.
Classification and characteristics of waterborne epoxy resin coatings. Since the late 1970 s developed the first Casmide360 two-component waterborne epoxy system, waterborne epoxy coatings has experienced more than 30 years development, waterborne epoxy resin coatings according to the way of film and two components of physical state can be divided into two categories.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The electron cloud density on midazole N - 3 is relatively high, so alkylation usually occurs first on this nitrogen atom. The product of an alkylation can be used to produce a nitrogen atom similar to pyridine, so it can be further reacted by producing imidazolate, a dialkylation.
The acylation of imidazole usually occurs on the n-3, but since the acyl is an electron base, the reaction can be controlled in the phase of unitary acylation, and the product is n-acyl imidazole.
The active hydrogen of imidazole can decompose the gril reagent, and the n-magnesium salt of imidazole is produced, and the imidazole is substituted by c-2 after isomerization. The latter is treated with iodide and can produce 1, 2-dimethyl imidazole.
The imidazole can be added to the pro-diene body, and the husband is 3-onium salt, and then the nucleophilic addition of the other molecule is the product of c-2 cyclation. For example, the reaction of 1-methyl-2-ethylimidazole with dimethyl dimethyl dimethylenedia was obtained, and it was found that 8a-ethyl-1-methyl1-1, 8-dihydromidazole and [1, 2-a] pyridine - 5, 6, 7, 8-tetrachylate.
Imidazole can be combined with histidine to bind Ni ions. In this case, imidazole can be used to elute the fusion protein with His -tag.
Imidazole can be used as a epoxy crosslinking agent, can improve the products of the bending, stretching, compression, such as mechanical properties, improve the performance of insulation, improve the chemical performance of resistance to chemicals, widely used in computers, electrical appliances.
Classification and characteristics of waterborne epoxy resin coatings. Since the late 1970 s developed the first Casmide360 two-component waterborne epoxy system, waterborne epoxy coatings has experienced more than 30 years development, waterborne epoxy resin coatings according to the way of film and two components of physical state can be divided into two categories.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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