News Details
Performance testing of low-temperature coating crosslinking agent
2017-8-27 15:28:15
Performance testing of low-temperature coating crosslinking agent
The properties of crosslinking agent used in low temperature are studied.
A phenyl alkylamine cross-linking agent was used as a control in the performance test of low temperature crosslinking agent, because its low temperature performance was familiar to everyone in the industry.
In the performance test of low temperature crosslinking agent, crosslinking agent 1 is a modified amine additive used in low temperature.Cross-linking agent 2 is an amine addition, which is provided by the positive butanol/xylene solution of 60% wt.Low temperature epoxy coating is quick and excellent solvent resistance when it is crosslinked.Crosslinking agent 3 is a non-phenolic modified Mannich base, which can make the low temperature crosslinking coating fast crosslinking.
The first part of this study is to evaluate the performance of the dual-functional liquid epoxy resin (WPE = 198, appendix 1) of these crosslinking criteria.Each paint mixture was blended and mixed with a mixture of solvents (methyl isobutyone/xylene/n-butanol = 1:1:1) and diluted to the GardnerH viscosity.The varnish is mixed for 5min, and then it is scraped onto the glass plate with a scraping plate (dry film thickness 1.5mil, wet film 63 mu), and the coating is immediately put into the constant temperature and humidity cabinet.
Periodic determination of the transparency, stickiness and hardness of the film was performed in a cycle (two weeks).Each have system adopts three different crosslinking conditions: 25 ℃, relative humidity (RH) 55%;10 ℃, RH90 %, and 4.5 ℃, RH80 %.
In addition to the determination of the performance of varnish film, we also used the differential scanning heat meter (DSC) to test the crosslinking rate of the paint base system.The determination consists of three steps.The first step is to determine the range of temperature scanning by using DSC/TGA (thermal analysis).The results indicate that the temperature range is determined by the crosslinking heat release, which can still be ignored (i.e. less than 1% weight) at the temperature limit.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
The properties of crosslinking agent used in low temperature are studied.
A phenyl alkylamine cross-linking agent was used as a control in the performance test of low temperature crosslinking agent, because its low temperature performance was familiar to everyone in the industry.
In the performance test of low temperature crosslinking agent, crosslinking agent 1 is a modified amine additive used in low temperature.Cross-linking agent 2 is an amine addition, which is provided by the positive butanol/xylene solution of 60% wt.Low temperature epoxy coating is quick and excellent solvent resistance when it is crosslinked.Crosslinking agent 3 is a non-phenolic modified Mannich base, which can make the low temperature crosslinking coating fast crosslinking.
The first part of this study is to evaluate the performance of the dual-functional liquid epoxy resin (WPE = 198, appendix 1) of these crosslinking criteria.Each paint mixture was blended and mixed with a mixture of solvents (methyl isobutyone/xylene/n-butanol = 1:1:1) and diluted to the GardnerH viscosity.The varnish is mixed for 5min, and then it is scraped onto the glass plate with a scraping plate (dry film thickness 1.5mil, wet film 63 mu), and the coating is immediately put into the constant temperature and humidity cabinet.
Periodic determination of the transparency, stickiness and hardness of the film was performed in a cycle (two weeks).Each have system adopts three different crosslinking conditions: 25 ℃, relative humidity (RH) 55%;10 ℃, RH90 %, and 4.5 ℃, RH80 %.
In addition to the determination of the performance of varnish film, we also used the differential scanning heat meter (DSC) to test the crosslinking rate of the paint base system.The determination consists of three steps.The first step is to determine the range of temperature scanning by using DSC/TGA (thermal analysis).The results indicate that the temperature range is determined by the crosslinking heat release, which can still be ignored (i.e. less than 1% weight) at the temperature limit.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
Using the DSC/TGA (from 50 to 170 f) to determine the temperature after the scan range, at a constant heating rate (10 ℃ / min) for the DSC scan, total heat of reaction of each have been system (delta H total) were determined.After reaching maximum temperature, quenching to sample - 50 ℃, to heating measurement to see if there are after cross-linking phenomena appear.In all cases, there was no post-crosslinking phenomenon when every DSC scan was detected.
Testing the last step is to mix a new good sample loading in the DSC vessels and immediately frozen samples to - 130 ℃ (dry ice);System resources to seven samples at the same time, the preparation of the seven samples of total time is less than 5 min, the seal of the DSC storage vessels in 4.5 ℃ freezer to scheduled days.
To the provisions of the number of days, a sealed samples out of the freezer and immediately under 0 ℃ / min constant heating rate measured by DSC scan.Click here to get seven data, draw a curve, integral DSC scan line at the bottom of the area, it is concluded that have been system under 4.5 ℃ after X days crosslinking of residual heat of reaction (delta H left), using the following equation (1) to calculate the reaction degree of each sample (or crosslinking %) :
Reaction degree, % = (1 - [delta H / left delta H total] (100) (1)
We found that when in the standard room temperature (25 ℃, RH55 %), each kind of crosslinking agent mixed income of coating with liquid epoxy resin are relatively fast drying time and gel time.Because crosslinking agent 3 has the shortest gelation time and Gardner drying time, it has the maximum activity.
Crosslinking agent 2 seems to be gelatinized the longest, because it contains solvents so that Shyodu gelatinization time is longer.In the absence of solvents, cross-linking agent 2 is a solid resin, so the measurement of its gelatinization time cannot be carried out faithfully.Crosslinking agent 2 and liquid epoxy resin blended Gardner, fast drying time is the second, but the speed may contain some false from the amine adduct solution volatile paint dry.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Using the DSC/TGA (from 50 to 170 f) to determine the temperature after the scan range, at a constant heating rate (10 ℃ / min) for the DSC scan, total heat of reaction of each have been system (delta H total) were determined.After reaching maximum temperature, quenching to sample - 50 ℃, to heating measurement to see if there are after cross-linking phenomena appear.In all cases, there was no post-crosslinking phenomenon when every DSC scan was detected.
Testing the last step is to mix a new good sample loading in the DSC vessels and immediately frozen samples to - 130 ℃ (dry ice);System resources to seven samples at the same time, the preparation of the seven samples of total time is less than 5 min, the seal of the DSC storage vessels in 4.5 ℃ freezer to scheduled days.
To the provisions of the number of days, a sealed samples out of the freezer and immediately under 0 ℃ / min constant heating rate measured by DSC scan.Click here to get seven data, draw a curve, integral DSC scan line at the bottom of the area, it is concluded that have been system under 4.5 ℃ after X days crosslinking of residual heat of reaction (delta H left), using the following equation (1) to calculate the reaction degree of each sample (or crosslinking %) :
Reaction degree, % = (1 - [delta H / left delta H total] (100) (1)
We found that when in the standard room temperature (25 ℃, RH55 %), each kind of crosslinking agent mixed income of coating with liquid epoxy resin are relatively fast drying time and gel time.Because crosslinking agent 3 has the shortest gelation time and Gardner drying time, it has the maximum activity.
Crosslinking agent 2 seems to be gelatinized the longest, because it contains solvents so that Shyodu gelatinization time is longer.In the absence of solvents, cross-linking agent 2 is a solid resin, so the measurement of its gelatinization time cannot be carried out faithfully.Crosslinking agent 2 and liquid epoxy resin blended Gardner, fast drying time is the second, but the speed may contain some false from the amine adduct solution volatile paint dry.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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