News Details
Antiseptic powder coating crosslinking agent
2017-8-24 16:54:41
Antiseptic powder coating crosslinking agent
The two-step method is used to develop epoxy resin and antiseptic powder coatings used in heavy anticorrosive powder coatings, and its main performance indexes reach the level of similar products abroad.The preparation technology of the crosslinking agent of epoxy resin and heavy anticorrosive powder coating was analyzed and the factors affecting its performance were discussed.
In recent years, with the rapid development of economic construction in our country, the petroleum and natural gas buried pipeline heavy-duty powder coatings with the demand of epoxy resins and crosslinking agent is more and more big, the quality requirements more and more is also high.
The requirement of this aspect is mainly reflected in: the requirement of anti-corrosion powder coating has good construction (high temperature quick crosslinking), wear resistance, corrosion resistance, cold and cold impact, long-term stability and so on.
Based on the analysis of infrared and liquid phase spectrogram of epoxy resin samples, the basic group is divided into phenolic epoxy resin.The molecular structure of the resin contains both bpa and phenolic phenol, which is A compound phenolic epoxy resin.This kind of resin has the characteristics of corrosion resistance, high hardness and good wear resistance.Its synthesis method is divided into two steps: the first step is the synthesis of the linear phenolic resin, and the second step is the synthesis of phenolic epoxy resin.
The synthesis of linear phenolic resins.The phenol formaldehyde into the reaction kettle, bisphenol A, and stirring up dissolved, catalyst reflux reaction to 90 ℃ in 3 ~ 5 h;To use dilute alkali to neutralize the reaction and suck out the upper water;Several times repeated washing with hot water to neutral, then heating dehydration, above 150 ℃ / 0.095 MPa vacuum after removing a small amount of free phenol, filtering, discharge, a quick linear phenolic resin.
The synthesis of phenolic epoxy resin.Will be the first step in the synthesis of linear phenolic resin and measurement of epoxy chloropropane into the reaction kettle, heat to dissolve, adding catalyst in 80 ~ 90 ℃ the etherification reaction of 5 ~ 6 h;After the reaction, the temperature is cooled, the solvent is dissolved, and the aqueous solution of sodium hydroxide is gradually added, and the closed-loop reaction is carried out.
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 two-step method is used to develop epoxy resin and antiseptic powder coatings used in heavy anticorrosive powder coatings, and its main performance indexes reach the level of similar products abroad.The preparation technology of the crosslinking agent of epoxy resin and heavy anticorrosive powder coating was analyzed and the factors affecting its performance were discussed.
In recent years, with the rapid development of economic construction in our country, the petroleum and natural gas buried pipeline heavy-duty powder coatings with the demand of epoxy resins and crosslinking agent is more and more big, the quality requirements more and more is also high.
The requirement of this aspect is mainly reflected in: the requirement of anti-corrosion powder coating has good construction (high temperature quick crosslinking), wear resistance, corrosion resistance, cold and cold impact, long-term stability and so on.
Based on the analysis of infrared and liquid phase spectrogram of epoxy resin samples, the basic group is divided into phenolic epoxy resin.The molecular structure of the resin contains both bpa and phenolic phenol, which is A compound phenolic epoxy resin.This kind of resin has the characteristics of corrosion resistance, high hardness and good wear resistance.Its synthesis method is divided into two steps: the first step is the synthesis of the linear phenolic resin, and the second step is the synthesis of phenolic epoxy resin.
The synthesis of linear phenolic resins.The phenol formaldehyde into the reaction kettle, bisphenol A, and stirring up dissolved, catalyst reflux reaction to 90 ℃ in 3 ~ 5 h;To use dilute alkali to neutralize the reaction and suck out the upper water;Several times repeated washing with hot water to neutral, then heating dehydration, above 150 ℃ / 0.095 MPa vacuum after removing a small amount of free phenol, filtering, discharge, a quick linear phenolic resin.
The synthesis of phenolic epoxy resin.Will be the first step in the synthesis of linear phenolic resin and measurement of epoxy chloropropane into the reaction kettle, heat to dissolve, adding catalyst in 80 ~ 90 ℃ the etherification reaction of 5 ~ 6 h;After the reaction, the temperature is cooled, the solvent is dissolved, and the aqueous solution of sodium hydroxide is gradually added, and the closed-loop reaction is carried out.
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
After the closed loop reaction, add the remaining solvent, stir and dissolve, wash repeatedly to neutral with hot water, and divide the lower water.Removing the solvent with low boiling temperature rise, in 140 ~ 160 ℃ heat 1 ~ 2 h, aneroid out after cooling;Filtration, crushing, packaging, instant phenolic epoxy resin.
The preparation of crosslinking agent.Previous anticorrosive epoxy powder coatings have been used in polycyanamine-imidazole crosslinking system.Although the system has a fast reaction speed, the crosslinking reaction is very hot and intense, which can produce internal stress and make the film brittle.Analyze the diplomatic agent samples, the main group is divided into end hydroxyl polymer with anionic catalytic crosslinking agent of distribution of material, through the synergy of the two, to ensure that the powder coating has both good flexibility, and has faster response speed.
Macromolecular hydroxyl compounds can be either hydroxyl polyesters or hydroxypolyether resins, or hydroxyphenolic resins.The latter is more reactive than the former, while the former is better than the latter.Based on the above analysis, combined with the sample analysis results, the compound crosslinking agent system of the hydroxypolyether, the terminal hydroxyphenolic resin and the anionic catalytic crosslinking agent was selected.
Measurement of glycol (neopentyl glycol, diethylene glycol, polypropylene glycol, etc.), dihydric phenol, hydroquinone and resorcinol, bisphenol A, etc.) and single, double loop oxide into the reaction kettle, heat, stir to dissolve addition polymerization in 90 ~ 130 ℃;When the softening point meets the requirements, the cooling, filtration, material, and the hydroxyl polyether resin are available.
The synthesis process of the hydroxyphenolic resin is basically the same as the linear phenolic resin.The synthesis of hydroxyl-terminated phenolic resin, hydroxyl-terminated polyether resin in reaction kettle and melting of up to 150 ℃ after being fully melted, join the measurement of anionic catalyst, uniform mixing, filtering, tabletting, packaging.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
After the closed loop reaction, add the remaining solvent, stir and dissolve, wash repeatedly to neutral with hot water, and divide the lower water.Removing the solvent with low boiling temperature rise, in 140 ~ 160 ℃ heat 1 ~ 2 h, aneroid out after cooling;Filtration, crushing, packaging, instant phenolic epoxy resin.
The preparation of crosslinking agent.Previous anticorrosive epoxy powder coatings have been used in polycyanamine-imidazole crosslinking system.Although the system has a fast reaction speed, the crosslinking reaction is very hot and intense, which can produce internal stress and make the film brittle.Analyze the diplomatic agent samples, the main group is divided into end hydroxyl polymer with anionic catalytic crosslinking agent of distribution of material, through the synergy of the two, to ensure that the powder coating has both good flexibility, and has faster response speed.
Macromolecular hydroxyl compounds can be either hydroxyl polyesters or hydroxypolyether resins, or hydroxyphenolic resins.The latter is more reactive than the former, while the former is better than the latter.Based on the above analysis, combined with the sample analysis results, the compound crosslinking agent system of the hydroxypolyether, the terminal hydroxyphenolic resin and the anionic catalytic crosslinking agent was selected.
Measurement of glycol (neopentyl glycol, diethylene glycol, polypropylene glycol, etc.), dihydric phenol, hydroquinone and resorcinol, bisphenol A, etc.) and single, double loop oxide into the reaction kettle, heat, stir to dissolve addition polymerization in 90 ~ 130 ℃;When the softening point meets the requirements, the cooling, filtration, material, and the hydroxyl polyether resin are available.
The synthesis process of the hydroxyphenolic resin is basically the same as the linear phenolic resin.The synthesis of hydroxyl-terminated phenolic resin, hydroxyl-terminated polyether resin in reaction kettle and melting of up to 150 ℃ after being fully melted, join the measurement of anionic catalyst, uniform mixing, filtering, tabletting, packaging.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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