News Details
Epoxy resin coating of normal temperature crosslinking agent
2017-3-9 16:06:18
Epoxy resin coating of normal temperature crosslinking agent, epoxy resin because of its structure characteristic of the epoxy groups and hydroxyl and ether bond and excellent adhesion, insulation, corrosion and chemical character, become the most representative one of the largest high-performance anti-corrosion coating resin varieties, dosage.
The world each year about more than 40% of the epoxy resin used in the manufacture of epoxy coating, mostly used in industry field, such as Bridges, vehicles, ships, ports, mining, petroleum, chemical industry, etc. But only form a complete set of epoxy resin using a specific crosslinking agent to generate mesh macromolecular crosslinking reaction, thus shows the outstanding feature.
Crosslinking agent is an indispensable component in epoxy resin coating system, plays a vital role. Can say the development of a new crosslinking agent is equivalent to the development of a new epoxy resin or new applications. Therefore, the modification of existing crosslinking agent and agent of the new development is the development trend of epoxy crosslinking agent.
Epoxy resin coatings of high reactivity, crosslink density is big, so the corrosion resistance of coating is good. But at the same time there is also a lack of physical and mechanical properties, such as poor elasticity, big issues such as brittleness, by introducing a flexible chain segment of crosslinking agent, such as with long chain fatty acid polyamide to be improved.
Epoxy resin coatings are often at the scene of mass construction, exist volatiles toxicity and operability in wet or humid and low temperature environment. At home and abroad in recent years developed a variety of non-toxic or low toxic, and it has excellent workability, mechanical properties and corrosion resistance of modified crosslinking agent, crosslinking agent such as modified ketone imide.
Without plus or weak acid catalyst, catalyst using high and amino or hydroxyl methyl functionality of melamine resin system, the self crosslinking reaction to a higher level. In both cases, slightly and the reaction in the formation of good network structure is the key.
In amino resin crosslinked coating crosslinked, the other is to take off the formaldehyde reaction and hydrolysis reaction. Take off formaldehyde reaction under the crosslinking temperature usually it is easy to happen, it's almost cause amino resin crosslinking the only reason for the release of formaldehyde, the other is formaldehyde free formaldehyde.
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.
Membrane crosslinked amino resin cross stitch will occur some hydrolysis reaction, some of the alkoxy methyl into hydroxymethyl, high and amino or hydroxyl methyl content of melamine resin hydrolysis reaction can be catalyzed by alkali, even at room temperature can slow hydrolysis occurs, so easier since the cross-linking amino resin, and paint viscosity rise phenomenon during storage. In order to avoid the occurrence of this phenomenon, can adopt in water-based coating alkali hydrolysis reaction, fully methyl etherification melamine resin or cosolvent.
Alkylation of melamine resin in aqueous alkali catalytic hydrolysis reaction in the system. Fully alkylation and part of the alkylation of melamine resin acid catalytic hydrolysis reaction in aqueous system, so you must use the closure of the acid catalyst in aqueous systems.
The main functional groups in the amino resin activity sequence (reactive) as follows, in the process of crosslinking main reactions are as shown in figure 5:
> NH (amino) > > N - CH2OH (hydroxymethyl) > > NCH2OCH3 (methoxy) > > NCH2OC4H9 (alkoxy)
D8190 resistance value maximum, NX - 2015 - a minimum resistance. Therefore, using D8190 model anti-corrosion performance of the crosslinking agent, best use NX - 2015 - a model anti-corrosion performance of the worst of the crosslinking agent.
Through analysis contrast crosslinking agent on the properties of epoxy resin anticorrosion coatings, from comprehensive performance consideration, choose D8190 crosslinking agent can make the performance of the various aspects to achieve the best, is a kind of ideal crosslinking agent.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The world each year about more than 40% of the epoxy resin used in the manufacture of epoxy coating, mostly used in industry field, such as Bridges, vehicles, ships, ports, mining, petroleum, chemical industry, etc. But only form a complete set of epoxy resin using a specific crosslinking agent to generate mesh macromolecular crosslinking reaction, thus shows the outstanding feature.
Crosslinking agent is an indispensable component in epoxy resin coating system, plays a vital role. Can say the development of a new crosslinking agent is equivalent to the development of a new epoxy resin or new applications. Therefore, the modification of existing crosslinking agent and agent of the new development is the development trend of epoxy crosslinking agent.
Epoxy resin coatings of high reactivity, crosslink density is big, so the corrosion resistance of coating is good. But at the same time there is also a lack of physical and mechanical properties, such as poor elasticity, big issues such as brittleness, by introducing a flexible chain segment of crosslinking agent, such as with long chain fatty acid polyamide to be improved.
Epoxy resin coatings are often at the scene of mass construction, exist volatiles toxicity and operability in wet or humid and low temperature environment. At home and abroad in recent years developed a variety of non-toxic or low toxic, and it has excellent workability, mechanical properties and corrosion resistance of modified crosslinking agent, crosslinking agent such as modified ketone imide.
Without plus or weak acid catalyst, catalyst using high and amino or hydroxyl methyl functionality of melamine resin system, the self crosslinking reaction to a higher level. In both cases, slightly and the reaction in the formation of good network structure is the key.
In amino resin crosslinked coating crosslinked, the other is to take off the formaldehyde reaction and hydrolysis reaction. Take off formaldehyde reaction under the crosslinking temperature usually it is easy to happen, it's almost cause amino resin crosslinking the only reason for the release of formaldehyde, the other is formaldehyde free formaldehyde.
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.
Membrane crosslinked amino resin cross stitch will occur some hydrolysis reaction, some of the alkoxy methyl into hydroxymethyl, high and amino or hydroxyl methyl content of melamine resin hydrolysis reaction can be catalyzed by alkali, even at room temperature can slow hydrolysis occurs, so easier since the cross-linking amino resin, and paint viscosity rise phenomenon during storage. In order to avoid the occurrence of this phenomenon, can adopt in water-based coating alkali hydrolysis reaction, fully methyl etherification melamine resin or cosolvent.
Alkylation of melamine resin in aqueous alkali catalytic hydrolysis reaction in the system. Fully alkylation and part of the alkylation of melamine resin acid catalytic hydrolysis reaction in aqueous system, so you must use the closure of the acid catalyst in aqueous systems.
The main functional groups in the amino resin activity sequence (reactive) as follows, in the process of crosslinking main reactions are as shown in figure 5:
> NH (amino) > > N - CH2OH (hydroxymethyl) > > NCH2OCH3 (methoxy) > > NCH2OC4H9 (alkoxy)
D8190 resistance value maximum, NX - 2015 - a minimum resistance. Therefore, using D8190 model anti-corrosion performance of the crosslinking agent, best use NX - 2015 - a model anti-corrosion performance of the worst of the crosslinking agent.
Through analysis contrast crosslinking agent on the properties of epoxy resin anticorrosion coatings, from comprehensive performance consideration, choose D8190 crosslinking agent can make the performance of the various aspects to achieve the best, is a kind of ideal crosslinking agent.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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