News Details
Aromatic and aliphatic polyamide coatings crosslinking agent
2017-8-29 12:21:34
Aromatic and aliphatic polyamide coatings crosslinking agent aromatic amine and its derivatives in the given system high reactivity and very good chemical resistance, but also has a very prominent yellowing tendency. Another weakness is that their toxicity leads to very suspicious physical activity. That is to say they have a hard time protecting the cross-linking agent of those systems that are required for environmental protection.
Imidazole is a five-element heterocyclic compound with two nitrogen atoms, one of which is a secondary amine, and the other one is a tertiary amine. The hydrogen activity on secondary amines is very high, causing the epoxy-opening ring. The hydrogen in the 2, 4 position of the midazole molecule can be replaced by a different group, resulting in a cluster of imidazole homologues. 2 - methymidazole and 2-phenymidazoline are the most commonly used crosslinking promoters in powder coatings.
Industrial product 2-methyl imidazole melting point 140? - 146? , the boiling point of 263? - 265? Activation temperature 82? - 87? (refers to the temperature that can produce crosslinking after 4 hours in 100gE - 51 epoxy resin). The appearance is light yellow to white crystal, often used as crosslinking accelerator.
It can be used as a promoter of dicyandiamide, dihydrazine, anhydride, phenolic resin and phenolic crosslinking agent. Generally, the amount of addition in powder coatings is 0.1% to 0.6%, and the dosage of catalyst for phenol crosslinking agent in heavy anti-corrosion epoxy powder coating is 0.6% to 1%. The disadvantage is that the coating color can be yellowed easily and affect the storage period of powder coating to varying degrees. The imidazole addition is sometimes referred to as the addition of imidazole, the famous epi-curep101. It is A 1:1 or 1.5:1-equivalent ratio of 2-methymidazole and Epon828 liquid bisphenol A epoxy resin.
The imidazole addition can be used either separately or in combination with other non-catalytic crosslinking agents. Individual use can provide optimal low-temperature crosslinking performance, and other crosslinking agents can provide better application effects, so this cross-linking agent ACTS as a catalyst.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Imidazole is a five-element heterocyclic compound with two nitrogen atoms, one of which is a secondary amine, and the other one is a tertiary amine. The hydrogen activity on secondary amines is very high, causing the epoxy-opening ring. The hydrogen in the 2, 4 position of the midazole molecule can be replaced by a different group, resulting in a cluster of imidazole homologues. 2 - methymidazole and 2-phenymidazoline are the most commonly used crosslinking promoters in powder coatings.
Industrial product 2-methyl imidazole melting point 140? - 146? , the boiling point of 263? - 265? Activation temperature 82? - 87? (refers to the temperature that can produce crosslinking after 4 hours in 100gE - 51 epoxy resin). The appearance is light yellow to white crystal, often used as crosslinking accelerator.
It can be used as a promoter of dicyandiamide, dihydrazine, anhydride, phenolic resin and phenolic crosslinking agent. Generally, the amount of addition in powder coatings is 0.1% to 0.6%, and the dosage of catalyst for phenol crosslinking agent in heavy anti-corrosion epoxy powder coating is 0.6% to 1%. The disadvantage is that the coating color can be yellowed easily and affect the storage period of powder coating to varying degrees. The imidazole addition is sometimes referred to as the addition of imidazole, the famous epi-curep101. It is A 1:1 or 1.5:1-equivalent ratio of 2-methymidazole and Epon828 liquid bisphenol A epoxy resin.
The imidazole addition can be used either separately or in combination with other non-catalytic crosslinking agents. Individual use can provide optimal low-temperature crosslinking performance, and other crosslinking agents can provide better application effects, so this cross-linking agent ACTS as a catalyst.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
And imidazole compounds as discussed above, it simply as a promoter of powder coating is not appropriate, because it can reduce the storage stability of the powder coating and lead to serious agglomeration and eventually lose industrial applications.
Most of aliphatic and aromatic primary amine with secondary amine are solid at room temperature, but they cannot be used as a crosslinking agent in epoxy powder coating, because the system of high reactivity, in extrusion processing can cause many problems, also can significantly reduce the storage stability of coatings. Several amine derivatives that have been developed can provide the necessary stability in the combination of powder coatings and solid epoxy resin.
The fatty compounds in aromatic and aliphatic polyamines are the direct chain structures, but the hydrocarbons can be saturated and unsaturated.
Alicyclic compounds refers to the hydrocarbon molecules contain carbon ring, which can be saturated and unsaturated carbon ring, a typical carbon ring ring and six-member ring five yuan, five yuan carbon ring of the more important is conjugate structure, and of course multiple hydrocarbon of ring structure, such as serial, and ring, new ring bridge hydrocarbon, etc.
Aromatic compounds are compounds that contain benzene rings, which have benzene and polycyclic aromatic hydrocarbons. Benzene ring and polycyclic class, even the benzene in multi-loop class class, etc., and condensed in the class has completely by benzene fused type, such as naphthalene, anthracene, phenanthrene, and diversity and benzene class, other polycyclic aromatic hydrocarbon and benzene ring and cyclopentadiene ring combination of 5 yuan of multiple ring structure such as indene, fluorene and acenaphthene and heterocyclic compounds, etc.
Modern aromatic refers to the hydrocarbon molecules containing at least one out of key domain of benzene ring, with unique properties of open chain compound or different alicyclic hydrocarbon (aromaticity and aromaticity) a class of compounds.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
And imidazole compounds as discussed above, it simply as a promoter of powder coating is not appropriate, because it can reduce the storage stability of the powder coating and lead to serious agglomeration and eventually lose industrial applications.
Most of aliphatic and aromatic primary amine with secondary amine are solid at room temperature, but they cannot be used as a crosslinking agent in epoxy powder coating, because the system of high reactivity, in extrusion processing can cause many problems, also can significantly reduce the storage stability of coatings. Several amine derivatives that have been developed can provide the necessary stability in the combination of powder coatings and solid epoxy resin.
The fatty compounds in aromatic and aliphatic polyamines are the direct chain structures, but the hydrocarbons can be saturated and unsaturated.
Alicyclic compounds refers to the hydrocarbon molecules contain carbon ring, which can be saturated and unsaturated carbon ring, a typical carbon ring ring and six-member ring five yuan, five yuan carbon ring of the more important is conjugate structure, and of course multiple hydrocarbon of ring structure, such as serial, and ring, new ring bridge hydrocarbon, etc.
Aromatic compounds are compounds that contain benzene rings, which have benzene and polycyclic aromatic hydrocarbons. Benzene ring and polycyclic class, even the benzene in multi-loop class class, etc., and condensed in the class has completely by benzene fused type, such as naphthalene, anthracene, phenanthrene, and diversity and benzene class, other polycyclic aromatic hydrocarbon and benzene ring and cyclopentadiene ring combination of 5 yuan of multiple ring structure such as indene, fluorene and acenaphthene and heterocyclic compounds, etc.
Modern aromatic refers to the hydrocarbon molecules containing at least one out of key domain of benzene ring, with unique properties of open chain compound or different alicyclic hydrocarbon (aromaticity and aromaticity) a class of compounds.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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