News Details
Cycloamidine coating crosslinking agent
2017-8-29 12:21:27
Cycloamidine coating crosslinking agent
The cycloamidine structure has the similar active amine base with the mimidazolis, which can also be used as the crosslinking agent and crosslinking promoter of epoxy resin.
Cycloamidine cross-linking agent 2-phenymidazoline is one of the most typical cycloamidine epoxides. It has been the main crosslinking agent for functional powder coatings, such as anti-corrosion, for a period of time.
This product is mainly used as raw material for the anti-optical crosslinking agent XX68, which is partially used in functional epoxy powder coating crosslinking (catalytic) and polyester resin with internal catalysts.
Wang Shensheng et al. Research shows that in the pure epoxy powder coating, 2 - phenyl ring amidine class crosslinking agent of imidazoline is as the main crosslinker can obviously reduce the crosslinking temperature and shorten the crosslinking time, can be in 15 min or 180 ℃ / 140 ℃ / 8 min under the conditions of crosslinking, and crosslinked coating after conventional technical indicators reached the powder coating. If used as a promoter in epoxy/polyester system, can realize 15 min or 180 ℃ / 160 ℃ / 7 min under the conditions of crosslinking, and the basic does not affect coating performance.
Dicycline, also known as DBU, is known as dicyclic amidine, and the chemical name is 1, 8-diazo (5, 4, 0) - 7-11 carene, and the molecular weight 152.14, colorless and transparent liquid. It's almost tasteless.
Two cycline refractive index 1. 5106. Soluble in water, ethanol, acetone, ethyl acetate, benzene, tetrachloride, dimethyl sulfoxide and dimethylformamide, which are difficult to dissolve in petroleum ether. Alkalinity is strongest in organic compounds, pH (1% aqueous solution) 12.8. It's less volatile. Low toxicity, LD501066mg/kg.
A medium temperature crosslinking agent for epoxy resin. Reference dosage 8 ~ l0phr, long period, within a few hours not gel, crosslinking conditions 10 120 ℃ 80 ℃ / 2 h / 2 h 10 150 ℃ / 3 h. Crosslinking material has good wet and heat resistance, electrical insulation and mechanical properties, thermal deformation temperature of 155 ℃. It can also be used as crosslinking promoter for other crosslinking agents.
2 - Phenylimidazoline (2-phenylimidazoline), also known as 2-phenyl - 2-imidazoline, the molecular formula of the C9H10N2, and white crystals, can be used as epoxy resin powder coating crosslinking agent, pharmaceutical raw materials or used in organic synthesis.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
The cycloamidine structure has the similar active amine base with the mimidazolis, which can also be used as the crosslinking agent and crosslinking promoter of epoxy resin.
Cycloamidine cross-linking agent 2-phenymidazoline is one of the most typical cycloamidine epoxides. It has been the main crosslinking agent for functional powder coatings, such as anti-corrosion, for a period of time.
This product is mainly used as raw material for the anti-optical crosslinking agent XX68, which is partially used in functional epoxy powder coating crosslinking (catalytic) and polyester resin with internal catalysts.
Wang Shensheng et al. Research shows that in the pure epoxy powder coating, 2 - phenyl ring amidine class crosslinking agent of imidazoline is as the main crosslinker can obviously reduce the crosslinking temperature and shorten the crosslinking time, can be in 15 min or 180 ℃ / 140 ℃ / 8 min under the conditions of crosslinking, and crosslinked coating after conventional technical indicators reached the powder coating. If used as a promoter in epoxy/polyester system, can realize 15 min or 180 ℃ / 160 ℃ / 7 min under the conditions of crosslinking, and the basic does not affect coating performance.
Dicycline, also known as DBU, is known as dicyclic amidine, and the chemical name is 1, 8-diazo (5, 4, 0) - 7-11 carene, and the molecular weight 152.14, colorless and transparent liquid. It's almost tasteless.
Two cycline refractive index 1. 5106. Soluble in water, ethanol, acetone, ethyl acetate, benzene, tetrachloride, dimethyl sulfoxide and dimethylformamide, which are difficult to dissolve in petroleum ether. Alkalinity is strongest in organic compounds, pH (1% aqueous solution) 12.8. It's less volatile. Low toxicity, LD501066mg/kg.
A medium temperature crosslinking agent for epoxy resin. Reference dosage 8 ~ l0phr, long period, within a few hours not gel, crosslinking conditions 10 120 ℃ 80 ℃ / 2 h / 2 h 10 150 ℃ / 3 h. Crosslinking material has good wet and heat resistance, electrical insulation and mechanical properties, thermal deformation temperature of 155 ℃. It can also be used as crosslinking promoter for other crosslinking agents.
2 - Phenylimidazoline (2-phenylimidazoline), also known as 2-phenyl - 2-imidazoline, the molecular formula of the C9H10N2, and white crystals, can be used as epoxy resin powder coating crosslinking agent, pharmaceutical raw materials or used in organic synthesis.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
The fluidity of powder coating is mainly derived from the second stage of powder coating film. In the phase of the flow, the surface tension gradient causes the bernadus vortex to form the orange peel. If the local difference is so great that the paint film is almost completely torn, the pinhole is formed. These problems are usually produced in the first stage of the film formation (melting phase) and are enhanced during the flow phase.
Therefore, to control the flow of powder coatings must have two prerequisites:
1) high surface tension, but in order to ensure that the base material can be fully wetted, it cannot be higher than the surface tension of the substrate. Therefore, the surface tension cannot be improved blindly.
2) the surface tension on the interface with air must be locally uniform.
According to the present powder production process, powders are generally characterized by non-homogeneity, so the second precondition is almost impossible without the use of flow control agents. Do not use flow control agent, powder coating is not only poor, there are orange peel, and the surface of the paint is inclined to produce pinhole. This is due to the difference of the surface tension of the powder coating melt. In this case, the film tends to flow in the direction of the higher surface tension, leading to the severe roughness of the coating.
Because of epoxy resin in many substrate with excellent adhesion, flexibility and low volume shrinkage ratio (about 2%), since 1938, in the field of industrial and civil coating has been widely used, especially used as industrial anti-corrosion coatings, it has occupied about 40% of the market.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The fluidity of powder coating is mainly derived from the second stage of powder coating film. In the phase of the flow, the surface tension gradient causes the bernadus vortex to form the orange peel. If the local difference is so great that the paint film is almost completely torn, the pinhole is formed. These problems are usually produced in the first stage of the film formation (melting phase) and are enhanced during the flow phase.
Therefore, to control the flow of powder coatings must have two prerequisites:
1) high surface tension, but in order to ensure that the base material can be fully wetted, it cannot be higher than the surface tension of the substrate. Therefore, the surface tension cannot be improved blindly.
2) the surface tension on the interface with air must be locally uniform.
According to the present powder production process, powders are generally characterized by non-homogeneity, so the second precondition is almost impossible without the use of flow control agents. Do not use flow control agent, powder coating is not only poor, there are orange peel, and the surface of the paint is inclined to produce pinhole. This is due to the difference of the surface tension of the powder coating melt. In this case, the film tends to flow in the direction of the higher surface tension, leading to the severe roughness of the coating.
Because of epoxy resin in many substrate with excellent adhesion, flexibility and low volume shrinkage ratio (about 2%), since 1938, in the field of industrial and civil coating has been widely used, especially used as industrial anti-corrosion coatings, it has occupied about 40% of the market.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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