News Details
Cathodic electrophoretic coatings with crosslinking agent
2017-4-3 15:38:49
Cathodic electrophoretic coatings with crosslinking agent,Swimming through force refers to the electrophoretic coating process, make a departure from the corresponding electrode on the substrate of electrophoretic painting ability. According to ford box of the preparation of test samples, the following conditions: 4 mm gap ford made of two pieces of phosphating steel box, swimming board under 250 v / 3 min, washing, baking, inner surface film total height measurement model, and the determination of thickness greater than 5 microns and the paint film is more than 10 microns.
Curing points rate refers to the electrophoretic paint film curing after leaching after a certain time in the regulation of mixed solvent, the quality of electrophoresis paint film and the quality of electrophoresis paint film in front of the leaching solvent ratio, usually used for characterization of electrophoresis paint film curing degree. The higher the ratio, curing, the better. Different slot liquid sealants, under the condition of 200 v / 2 min, preparation of two batches of samples, respectively in: condition of 1160 ℃ / 2170 ℃ / min and conditions 25 25 min baking, then soak in 1:1 (mass ratio) glycol ether and mixed solvent of methyl isobutyl ketone, 24 h after observing the appearance, drying, weighing, calculation: curing points ratio = (after soaking model initial sample quality - quality)/(soak before sample quality - starting quality) x 100%
Preparation of crosslinking agent with closed agent found that B and C, epsilon - caprolactam solution for the endothermic process. Epsilon - caprolactam solution in a closed agent B for a long time and unstable, the temperature below 30 ℃, the precipitation has a crystal; Epsilon - caprolactam solution in a closed agent C fast and stable, below 0 ℃, is crystal precipitation.
This is because the epsilon - caprolactam into hydrogen bonding, the addition of additives can hinder the formation of hydrogen bonds, thereby increasing the stability of the mixture. Tests show that add a small amount of additives, can make the epsilon - caprolactam stable dispersion in the mixture, closed reaction.
This is because the epsilon - caprolactam into hydrogen bonding, the addition of additives can hinder the formation of hydrogen bonds, thereby increasing the stability of the mixture. Tests show that add a small amount of additives, can make the epsilon - caprolactam stable dispersion in the mixture, closed reaction.
With A, B, C closed agent ford box wall paint film on the swimming height above the blank sample, and the value of the three relatively close. Due to the blank sample is using isocyanate TDI, and A, B, C using MDI, it shows that using MDI, make the swimming through force of cathodic electrophoretic coating has improved significantly.
With B and C closed agent the curing rate of qualified, and the blank sample and A fraction of the solidified sealants not qualified (curing rate more than 90% for qualified). Under the condition of 2, four kinds of curing rate are qualified, but the blank sample and A closed agent curing rate value is low. After soaking on the appearance of the blank sample in condition 1 and A sealing agent have swelling phenomenon, B and C sealants no change.
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
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
It shows that the epsilon - caprolactam, system at relatively low temperature curing, crosslinking situation is better. Not the epsilon - caprolactam blank sample and A closed crosslinking agent is poorer, resin curing inadequate. After soaking, swelling of resin, and part of the crosslinked resin wrong is dissolved, resulting in low solidifying point. B and C sealants, didn't find the existence of the auxiliary effect on solidification fraction.
Using MDI instead of TDI, can improve the swimming through force of cathodic electrodeposition coatings. Epsilon - caprolactam as the blocking agent, the crosslinking agent can reduce the curing temperature of cathodic electrophoresis coating, to improve the paint film curing rate.
This experiment work just provide a improvement direction, to really used for cathodic electrophoretic coating also need further study in adaptability and compatibility, etc. It should be pointed out that, the experiment on only the cathodic electrophoretic coating with crosslinking agent was improved, the system as a whole no more adjustments, swimming through force and the curing rate of increase is limited, to enhance the overall performance of the cathodic electrophoretic coating need to do more work.
This experiment work just provide a improvement direction, to really used for cathodic electrophoretic coating also need further study in adaptability and compatibility, etc. It should be pointed out that, the experiment on only the cathodic electrophoretic coating with crosslinking agent was improved, the system as a whole no more adjustments, swimming through force and the curing rate of increase is limited, to enhance the overall performance of the cathodic electrophoretic coating need to do more work.
Electrophoretic paint, also called electrophoresis coating, now there are many people continue to use "electrophoretic paint," instead of "electrophoretic coating". As the defects of conventional spraying continues to emerge, electrophoresis began to become more and more popular.
Electrophoresis paint also began to constantly upgrade, from anode electrophoresis paint to cathodic electrophoretic paint, from single-component electrophoresis paint to the two-component electrophoresis paint, electrophoretic paint development also promoted the development of the electrophoretic painting.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Electrophoresis paint also began to constantly upgrade, from anode electrophoresis paint to cathodic electrophoretic paint, from single-component electrophoresis paint to the two-component electrophoresis paint, electrophoretic paint development also promoted the development of the electrophoretic painting.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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