News Details
Solvent-free epoxy coating with crosslinking agent
2017-4-23 18:16:03
Solvent-free epoxy coating with crosslinking agent,Low viscosity resin determines coating high crosslinking density of crosslinking reaction, coating chemical medium corrosion resistant performance is good, but the coating brittleness. High solid content of solvent-free system usually choose active diluents lower the viscosity of the system, but due to its low molecular weight increases the more coating brittleness, and it can reduce the temperature resistance of the coating.
Bisphenol F epoxy resin and bisphenol A type epoxy resin properties similar to that of two of the hydrogen bond to replace the linear bisphenol-a resin on the two methyl, so its viscosity was much lower than that of bisphenol A type epoxy resin, suitable for solvent-free coating film-forming resin, used with bisphenol A type epoxy resin, can reduce the film viscosity of epoxy resin, and can improve the physical and chemical properties of the resin.
This experiment by modified aliphatic amine as crosslinking agent, studied the bisphenol A type epoxy resin E51 type with bisphenol F epoxy resin (A) (B) the influence of different proportion of coating and coating properties. Test the viscosity of the coating, the bending resistance of coating performance (1.5 1000 microns, DHS), cathodic disbonding resistance (1.5 V, 20 + 3 ℃ and 28 d), the heat resistance (90 ℃ boiled), acid (HCl) 10%, alkali resistance (10% NaOH).
With the increase of bisphenol F resin content, mixed resin viscosity reducing, bisphenol F resin of bisphenol A type epoxy resin dilute effect is quite obvious, bisphenol F resin content of 20% (mass), mixed resin viscosity basically to 1/2 of bisphenol A epoxy resin, the toughness of the coating, the cathodic disbonding resistance, heat resistance, chemical resistance were increased with the increase of dosage of bisphenol F resin, adding amount of more than 25%, the slow increase trend.
The addition of bisphenol F resin obviously improves the physico-chemical properties of the coating, avoid using reactive diluent reduces the crosslinking of heat resistance and mechanical properties.
So in bisphenol A epoxy resin E51 add 20-25% of bisphenol F resin, its comprehensive performance can meet the need.
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
Crosslinking agent on the film-forming performance of epoxy coating and coating after the use of performance plays a decisive role. Commonly used in solvent-free epoxy coating of amine crosslinking agent has the following kinds: modified polyamide, modification, loch alkali, modified alicyclic amine, modified alicyclic amine. Modified polyamide crosslinking agent and slow reaction of epoxy resin, unable to meet the requirements of fast crosslinked coating.
Modification, nice after alkali crosslinked film sealed performance is good, oil resistant, resistant to chemicals used in good performance. Modified alicyclic amine crosslinking agent response speed, low viscosity, got behind in membrane material of high hardness, good flexibility, excellent chemical resistance. Modified alicyclic amine crosslinked film forming matter heat-resisting performance, physical and mechanical performance is good.
Therefore, with the modified mann loch, modified alicyclic amine, modified alicyclic amine alkali three types of crosslinking agent. And, using the two kinds of modified alicyclic amine and modified alicyclic amine mixed crosslinking agent as crosslinking agent, the film forming matter can integrated the advantages of two kinds of crosslinking agent to meet the requirements of film performance.
In film forming matter of bisphenol A epoxy resin E51 and bisphenol F resin than for conditions, was to test the influence of different types of crosslinking on the coating performance. Tested under the condition of the temperature is 25 ℃ and 45 ℃ coating (1000 microns), action time, resistance to bending properties of the coating (1.5 1000 microns, DHS), cathodic disbonding resistance (1.5 V, 20 + 3 ℃ and 28 d), (90 ℃ boiled) heat resistance and adhesion (75 ℃, 48 h).
At present, solvent-free epoxy coating is widely used in construction with heating device of double tube feeding mix spraying equipment, in order to reduce the paint viscosity increase construction adaptability, usually paint spraying after preheating temperature of 40 ~ 50 ℃. This study give full consideration to the coating construction adaptability, should choose thixotropy is not sensitive to the temperature change of thixotropic agent, ensure that coating under different temperature environment are able to obtain a better resistance to flow sex, in order to realize a thick paint film coating.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Bisphenol F epoxy resin and bisphenol A type epoxy resin properties similar to that of two of the hydrogen bond to replace the linear bisphenol-a resin on the two methyl, so its viscosity was much lower than that of bisphenol A type epoxy resin, suitable for solvent-free coating film-forming resin, used with bisphenol A type epoxy resin, can reduce the film viscosity of epoxy resin, and can improve the physical and chemical properties of the resin.
This experiment by modified aliphatic amine as crosslinking agent, studied the bisphenol A type epoxy resin E51 type with bisphenol F epoxy resin (A) (B) the influence of different proportion of coating and coating properties. Test the viscosity of the coating, the bending resistance of coating performance (1.5 1000 microns, DHS), cathodic disbonding resistance (1.5 V, 20 + 3 ℃ and 28 d), the heat resistance (90 ℃ boiled), acid (HCl) 10%, alkali resistance (10% NaOH).
With the increase of bisphenol F resin content, mixed resin viscosity reducing, bisphenol F resin of bisphenol A type epoxy resin dilute effect is quite obvious, bisphenol F resin content of 20% (mass), mixed resin viscosity basically to 1/2 of bisphenol A epoxy resin, the toughness of the coating, the cathodic disbonding resistance, heat resistance, chemical resistance were increased with the increase of dosage of bisphenol F resin, adding amount of more than 25%, the slow increase trend.
The addition of bisphenol F resin obviously improves the physico-chemical properties of the coating, avoid using reactive diluent reduces the crosslinking of heat resistance and mechanical properties.
So in bisphenol A epoxy resin E51 add 20-25% of bisphenol F resin, its comprehensive performance can meet the need.
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
Crosslinking agent on the film-forming performance of epoxy coating and coating after the use of performance plays a decisive role. Commonly used in solvent-free epoxy coating of amine crosslinking agent has the following kinds: modified polyamide, modification, loch alkali, modified alicyclic amine, modified alicyclic amine. Modified polyamide crosslinking agent and slow reaction of epoxy resin, unable to meet the requirements of fast crosslinked coating.
Modification, nice after alkali crosslinked film sealed performance is good, oil resistant, resistant to chemicals used in good performance. Modified alicyclic amine crosslinking agent response speed, low viscosity, got behind in membrane material of high hardness, good flexibility, excellent chemical resistance. Modified alicyclic amine crosslinked film forming matter heat-resisting performance, physical and mechanical performance is good.
Therefore, with the modified mann loch, modified alicyclic amine, modified alicyclic amine alkali three types of crosslinking agent. And, using the two kinds of modified alicyclic amine and modified alicyclic amine mixed crosslinking agent as crosslinking agent, the film forming matter can integrated the advantages of two kinds of crosslinking agent to meet the requirements of film performance.
In film forming matter of bisphenol A epoxy resin E51 and bisphenol F resin than for conditions, was to test the influence of different types of crosslinking on the coating performance. Tested under the condition of the temperature is 25 ℃ and 45 ℃ coating (1000 microns), action time, resistance to bending properties of the coating (1.5 1000 microns, DHS), cathodic disbonding resistance (1.5 V, 20 + 3 ℃ and 28 d), (90 ℃ boiled) heat resistance and adhesion (75 ℃, 48 h).
At present, solvent-free epoxy coating is widely used in construction with heating device of double tube feeding mix spraying equipment, in order to reduce the paint viscosity increase construction adaptability, usually paint spraying after preheating temperature of 40 ~ 50 ℃. This study give full consideration to the coating construction adaptability, should choose thixotropy is not sensitive to the temperature change of thixotropic agent, ensure that coating under different temperature environment are able to obtain a better resistance to flow sex, in order to realize a thick paint film coating.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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