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Amino resin coating crosslinking agent
2017-8-24 16:54:51
Amino resin coating crosslinking agent has been studied and studied for many years.Four different types of alkylated amino formaldehyde resins used in coating industry are urea, melamine, benzoic melamine and ganourea formaldehyde resin.
Amino resin coating crosslinking agent according to the route of preparation, all active components, there may be more functional groups may also all of the functional groups are F1 type, but there is no only resin containing from F2 to F6, a kind of functional groups.
Some alkylated industrial products contain compounds of F1, F2 and F4 functional groups.The potential candidate resins of powder coatings are high alkylation types with F1, F7 and low content F2 functional groups.
In amino resin coating crosslinking agent during the crosslinking process, the formation of the crosslinking network by amino crosslinking agent can polymer of high impact, because during the amino resin synthesis triazine ring since the crosslinking increased their average functionality.All industrial melamine resin varieties have varying degrees of self-condensation triazine rings, which are connected by methylene (-n-ch2-n -) or methylene ether groups (-n-ch2och2-n -).
It is possible to connect multiple functional groups with diazo atoms while maintaining the structure of the above functional groups and through the methylene or methylene ether bridge.The reaction of the polymer with the hydroxy functional group and the melamine (HMMM) is an ether exchange reaction.In the presence of acidic catalysts, the HMMM reacts with the high alcohol to release the methanol.
An attempt to quantify the complexity of the cross-linking process is that the self-condensation of amino resins depends on the cross-linking conditions and the catalysts used.The autocondensation is the only reactant that comes out.
Alkanoxy also reacts with other functional groups, including the representative carboxylic acid in the powder coating resin, to promote crosslinking, and often introduce these groups into the polymer.The relative reaction activity of carboxyl group depends on the amount of catalyst and the type of amino resin.
In 1994, Craun introduced the method of crosslinking of the catalytic ester exchange (ENCAT) of the epoxidated nucleophilic group (ENCAT), which can be applied to powder coating technology.
ENCAT include: first, the preparation of succinic acid methyl ester, and all four type epoxy resin reaction to form epoxy ester, and again in a nucleophilic reagent is involved in case the further reaction with additional amount of epoxy resin.
Chinese name: Diethyl toluene diamine(DETDA)
Amino resin coating crosslinking agent according to the route of preparation, all active components, there may be more functional groups may also all of the functional groups are F1 type, but there is no only resin containing from F2 to F6, a kind of functional groups.
Some alkylated industrial products contain compounds of F1, F2 and F4 functional groups.The potential candidate resins of powder coatings are high alkylation types with F1, F7 and low content F2 functional groups.
In amino resin coating crosslinking agent during the crosslinking process, the formation of the crosslinking network by amino crosslinking agent can polymer of high impact, because during the amino resin synthesis triazine ring since the crosslinking increased their average functionality.All industrial melamine resin varieties have varying degrees of self-condensation triazine rings, which are connected by methylene (-n-ch2-n -) or methylene ether groups (-n-ch2och2-n -).
It is possible to connect multiple functional groups with diazo atoms while maintaining the structure of the above functional groups and through the methylene or methylene ether bridge.The reaction of the polymer with the hydroxy functional group and the melamine (HMMM) is an ether exchange reaction.In the presence of acidic catalysts, the HMMM reacts with the high alcohol to release the methanol.
An attempt to quantify the complexity of the cross-linking process is that the self-condensation of amino resins depends on the cross-linking conditions and the catalysts used.The autocondensation is the only reactant that comes out.
Alkanoxy also reacts with other functional groups, including the representative carboxylic acid in the powder coating resin, to promote crosslinking, and often introduce these groups into the polymer.The relative reaction activity of carboxyl group depends on the amount of catalyst and the type of amino resin.
In 1994, Craun introduced the method of crosslinking of the catalytic ester exchange (ENCAT) of the epoxidated nucleophilic group (ENCAT), which can be applied to powder coating technology.
ENCAT include: first, the preparation of succinic acid methyl ester, and all four type epoxy resin reaction to form epoxy ester, and again in a nucleophilic reagent is involved in case the further reaction with additional amount of epoxy resin.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ 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).
Ester exchange is known as the crosslinking mechanism.In general, weak catalysts such as zinc octoate are used for the crosslinking of active esters or hydroxy functional compounds.But ENCAT USES highly alkaline alcohols, which are interlinked when the nucleophile opens the epoxy ring and the nucleophile is formed with the epoxide.
The rate of exchange rate depends on various factors: the concentration of nucleophilic reagent and epoxide "co-induced";The alkalinity and nucleophilicity of nucleophilic reagents;The ester and hydroxyl structure of the reaction.
Using gas chromatography to study ester exchange, the epoxy ester showed the self-crosslinking of ENCAT, and the hydroxyester on the end and the epoxy ester were exchanged for methanol.This type of crosslinking type is obtained by the activation of secondary hydroxyl ester carbonyl group.
Ultraviolet radiation crosslinking mechanism of the first step is to split light initiator generated two free radicals, and the inertia of nuclear X - M * M monomer molecules into activation, it reacts with another inert monomer activation dimer.There is no loss of activity in this addition process, which is deduced that the chain can continue to grow by adding new monomer (nM).
Until finally, through the termination process, the activity is eliminated and further chain growth is terminated.Whether it is a collision between two growth chains, or a growth chain colliding with a free radical, or a collision between the growth chain and impurities or the surface of the substrate, the chain can be terminated or stopped.
UV light crosslinking powder coating used in wood coating, such as medium density fiberboard (MDF), aluminum and magnesium alloy coating, plastic coating, auto evaporator, heavy workpieces, such as pieces of pre-loaded and coil coating, etc.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Ester exchange is known as the crosslinking mechanism.In general, weak catalysts such as zinc octoate are used for the crosslinking of active esters or hydroxy functional compounds.But ENCAT USES highly alkaline alcohols, which are interlinked when the nucleophile opens the epoxy ring and the nucleophile is formed with the epoxide.
The rate of exchange rate depends on various factors: the concentration of nucleophilic reagent and epoxide "co-induced";The alkalinity and nucleophilicity of nucleophilic reagents;The ester and hydroxyl structure of the reaction.
Using gas chromatography to study ester exchange, the epoxy ester showed the self-crosslinking of ENCAT, and the hydroxyester on the end and the epoxy ester were exchanged for methanol.This type of crosslinking type is obtained by the activation of secondary hydroxyl ester carbonyl group.
Ultraviolet radiation crosslinking mechanism of the first step is to split light initiator generated two free radicals, and the inertia of nuclear X - M * M monomer molecules into activation, it reacts with another inert monomer activation dimer.There is no loss of activity in this addition process, which is deduced that the chain can continue to grow by adding new monomer (nM).
Until finally, through the termination process, the activity is eliminated and further chain growth is terminated.Whether it is a collision between two growth chains, or a growth chain colliding with a free radical, or a collision between the growth chain and impurities or the surface of the substrate, the chain can be terminated or stopped.
UV light crosslinking powder coating used in wood coating, such as medium density fiberboard (MDF), aluminum and magnesium alloy coating, plastic coating, auto evaporator, heavy workpieces, such as pieces of pre-loaded and coil coating, etc.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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