News Details
Epoxy coatings crosslinking agent
2017-3-27 10:47:45
Epoxy coatings crosslinking agent,Epoxy group with - CH (O) CH - structure of functionality. Characterized by strong reactivity. The ring opening polymerization or molecular chain growth after addition reaction with other compounds. Containing epoxy group and multiple functional groups of two or more compounds generated after reaction with crosslinking structure is cured, it is epoxy resin and its curing. Is a kind of thermosetting resin application range is very wide.
As a result of the existence of high tension on three yuan, can make epoxy group under mild conditions with primary amine, thiol and hydroxyl nucleophilic ring opening reaction of reagent, respectively to form secondary amine, sulfide, or ether bond.
According to the chemical properties of the active hydrogen compounds into alkaline compounds (e.g., primary amine, secondary amine, amide, etc.) and acid compounds (such as carboxylic acid, phenol, alcohol, etc.). Their lively hydrogen atoms with epoxy group will produce the following addition reaction.
Alkaline compound according to the mechanism of nucleophilic reaction with epoxy group, generally alkaline big activity, such as fatty amine > aromatic amine. Acidic compounds according to the mechanism of electrophilic reaction with epoxy group, generally acidic big activity, such as carboxylic acid phenol > > alcohol.
Aliphatic primary amine epoxy group and the end of reaction at room temperature can, need not promoter. But a series of proton donor material (such as alcohols, phenols, carboxylic acid, sulfonic acid and water, etc.) will be good reaction.
And proton acceptor material (such as esters, ethers and ketones and nitriles) have inhibitory effect on it. Promote the order as: acid phenol water > alcohol > > nitrile or higher or more aromatic hydrocarbons (benzene, toluene, etc.) > 2 oxygen mixed cyclohexane > diisopropyl ether.
Aromatic amine is smaller than the activity of fatty amine, slow speed and the reaction of epoxy group. Only about 30% of the resin at room temperature for the reaction. This is due to the aromatic amine on the nitrogen atom of asymmetric electrons are partially spread of benzene ring (E effect of benzene nucleus), which reduces the alkaline, and the three-dimensional steric hindrance effect of benzene ring. However, aromatic amine and alicyclic epoxy reaction is faster than fatty amine.
This may be the cause of the relative acidity of aromatic amine larger. Reaction of the aromatic amine and but the season can also be alcohol, phenol, boron trifluoride complex enzyme and stannous build, etc. Stannous bitterness of alicyclic epoxy resin curing acceleration is particularly obvious.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
Amide group on the activity of hydrogen atoms is smaller. It is difficult to react at room temperature with epoxy group. In KOH and NaOH or sodium phthalate etc. The presence of strong alkali promoter; Or under the high temperature of 150 ℃ above to generate the cycloaddition. The reaction and can be used for the modification of epoxy resin.
Alcohol as electrophilic reagent and the reaction of epoxy group. But because of its weak acidity, namely, electrophilic is small, so without accelerator existence requires above 200 ℃ can response. Alcohol and epoxy group of reactivity order: primary alcohol > secondary alcohol > tertiary alcohols. Tertiary amine such as alkaline compounds can promote the epoxy groups and hydroxyl in the quick reaction under low temperature (100 ℃).
Phenol is greater than alcohol acid. The epoxy groups and hydroxyl so phenol reaction speed is faster than alcohol hydroxyl. To start at 200 ℃. In KOH alkali promoter, such as the reaction can at 100 ℃.
Carboxyl and the reaction of epoxy group is slower than the amine. General can't generate high degree of crosslinking structure at room temperature. In above 100 ℃ heating for a long time to cure. Tertiary amine and quaternary ammonium salt alkaline compounds can promote the reaction. Used for the toughening of epoxy resin and curing, the synthesis of vinyl ester resin, etc.
Under the effect of alkaline promoters, such as alcohol, phenol and carboxylic acid compounds containing hydroxyl and glycidyl ether in the order of reactivity for alcohol phenol > > carboxylic acid. This and their anionic alkaline size order is the same.
Thiol (mercaptan) similar to the hydroxyl groups can react with epoxy group, generate product containing para hydroxy and sulfur ether bond. Tertiary amine and other amine compound reaction has a strong role in promoting. The reaction rate much faster than the reaction of amine and epoxy group, especially in low temperature, even at 0 ℃ can react. Increase the amine alkali can increase fast reaction rate of the accelerator.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
As a result of the existence of high tension on three yuan, can make epoxy group under mild conditions with primary amine, thiol and hydroxyl nucleophilic ring opening reaction of reagent, respectively to form secondary amine, sulfide, or ether bond.
According to the chemical properties of the active hydrogen compounds into alkaline compounds (e.g., primary amine, secondary amine, amide, etc.) and acid compounds (such as carboxylic acid, phenol, alcohol, etc.). Their lively hydrogen atoms with epoxy group will produce the following addition reaction.
Alkaline compound according to the mechanism of nucleophilic reaction with epoxy group, generally alkaline big activity, such as fatty amine > aromatic amine. Acidic compounds according to the mechanism of electrophilic reaction with epoxy group, generally acidic big activity, such as carboxylic acid phenol > > alcohol.
Aliphatic primary amine epoxy group and the end of reaction at room temperature can, need not promoter. But a series of proton donor material (such as alcohols, phenols, carboxylic acid, sulfonic acid and water, etc.) will be good reaction.
And proton acceptor material (such as esters, ethers and ketones and nitriles) have inhibitory effect on it. Promote the order as: acid phenol water > alcohol > > nitrile or higher or more aromatic hydrocarbons (benzene, toluene, etc.) > 2 oxygen mixed cyclohexane > diisopropyl ether.
Aromatic amine is smaller than the activity of fatty amine, slow speed and the reaction of epoxy group. Only about 30% of the resin at room temperature for the reaction. This is due to the aromatic amine on the nitrogen atom of asymmetric electrons are partially spread of benzene ring (E effect of benzene nucleus), which reduces the alkaline, and the three-dimensional steric hindrance effect of benzene ring. However, aromatic amine and alicyclic epoxy reaction is faster than fatty amine.
This may be the cause of the relative acidity of aromatic amine larger. Reaction of the aromatic amine and but the season can also be alcohol, phenol, boron trifluoride complex enzyme and stannous build, etc. Stannous bitterness of alicyclic epoxy resin curing acceleration is particularly obvious.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
Amide group on the activity of hydrogen atoms is smaller. It is difficult to react at room temperature with epoxy group. In KOH and NaOH or sodium phthalate etc. The presence of strong alkali promoter; Or under the high temperature of 150 ℃ above to generate the cycloaddition. The reaction and can be used for the modification of epoxy resin.
Alcohol as electrophilic reagent and the reaction of epoxy group. But because of its weak acidity, namely, electrophilic is small, so without accelerator existence requires above 200 ℃ can response. Alcohol and epoxy group of reactivity order: primary alcohol > secondary alcohol > tertiary alcohols. Tertiary amine such as alkaline compounds can promote the epoxy groups and hydroxyl in the quick reaction under low temperature (100 ℃).
Phenol is greater than alcohol acid. The epoxy groups and hydroxyl so phenol reaction speed is faster than alcohol hydroxyl. To start at 200 ℃. In KOH alkali promoter, such as the reaction can at 100 ℃.
Carboxyl and the reaction of epoxy group is slower than the amine. General can't generate high degree of crosslinking structure at room temperature. In above 100 ℃ heating for a long time to cure. Tertiary amine and quaternary ammonium salt alkaline compounds can promote the reaction. Used for the toughening of epoxy resin and curing, the synthesis of vinyl ester resin, etc.
Under the effect of alkaline promoters, such as alcohol, phenol and carboxylic acid compounds containing hydroxyl and glycidyl ether in the order of reactivity for alcohol phenol > > carboxylic acid. This and their anionic alkaline size order is the same.
Thiol (mercaptan) similar to the hydroxyl groups can react with epoxy group, generate product containing para hydroxy and sulfur ether bond. Tertiary amine and other amine compound reaction has a strong role in promoting. The reaction rate much faster than the reaction of amine and epoxy group, especially in low temperature, even at 0 ℃ can react. Increase the amine alkali can increase fast reaction rate of the accelerator.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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