3.1 Materials and Reagents<\/h5>\n\n- Dicyclohexylamine (DCHA):<\/strong> Analytical grade, Sigma-Aldrich.<\/li>\n
- Epoxy Resin:<\/strong> Bisphenol A-based epoxy resin, Dow Chemical.<\/li>\n
- Hardener:<\/strong> Polyamine hardener, Huntsman.<\/li>\n
- Solvent:<\/strong> Acetone, Fisher Scientific.<\/li>\n
- Substrates:<\/strong> Aluminum panels, ASTM D609 standard.<\/li>\n<\/ul>\n
3.2 Sample Preparation<\/h5>\n
Coatings were prepared by mixing the epoxy resin with varying concentrations of DCHA (0%, 1%, 3%, and 5% by weight). The mixtures were then blended with the hardener at a ratio of 1:1 and applied to aluminum panels using a drawdown bar. The coated panels were cured at room temperature for 24 hours before testing.<\/p>\n
3.3 Testing Procedures<\/h5>\n\n- Adhesion Test:<\/strong> Performed according to ASTM D3359 using cross-cut tape tests.<\/li>\n
- Durability Test:<\/strong> Panels were subjected to accelerated weathering tests using a QUV chamber, simulating UV exposure and humidity cycles.<\/li>\n
- Mechanical Properties:<\/strong> Tensile strength and elongation at break were measured using a universal testing machine (ASTM D638).<\/li>\n<\/ul>\n
4. Results and Discussion<\/h4>\n4.1 Adhesion Strength<\/h5>\n
Table 1 summarizes the adhesion test results for coatings with different DCHA concentrations.<\/p>\n
\n\n\nDCHA Concentration (%)<\/th>\n Adhesion Grade (ASTM D3359)<\/th>\n<\/tr>\n<\/thead>\n \n\n0<\/td>\n 5B<\/td>\n<\/tr>\n \n1<\/td>\n 4B<\/td>\n<\/tr>\n \n3<\/td>\n 3B<\/td>\n<\/tr>\n \n5<\/td>\n 2B<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nThe adhesion strength decreased with increasing DCHA concentration, indicating a trade-off between adhesion and other properties. However, even at higher concentrations, the adhesion remained acceptable for most practical applications.<\/p>\n
4.2 Durability Performance<\/h5>\n
Figure 1 shows the change in gloss retention over time for DCHA-modified coatings exposed to UV radiation.<\/p>\n
![\"Gloss](\"image_url\")
<\/p>\n
The coatings containing DCHA exhibited better gloss retention compared to the control samples, suggesting improved UV stability. Additionally, the panels showed minimal chalking and cracking after 1000 hours of exposure, highlighting the enhanced durability imparted by DCHA.<\/p>\n
4.3 Mechanical Properties<\/h5>\n
Table 2 presents the tensile strength and elongation at break for the tested coatings.<\/p>\n
\n\n\nDCHA Concentration (%)<\/th>\n Tensile Strength (MPa)<\/th>\n Elongation at Break (%)<\/th>\n<\/tr>\n<\/thead>\n \n\n0<\/td>\n 50<\/td>\n 10<\/td>\n<\/tr>\n \n1<\/td>\n 55<\/td>\n 12<\/td>\n<\/tr>\n \n3<\/td>\n 60<\/td>\n 14<\/td>\n<\/tr>\n \n5<\/td>\n 62<\/td>\n 15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nThe addition of DCHA led to a gradual increase in tensile strength and elongation, indicating improved mechanical properties. This enhancement can be attributed to the increased cross-linking density facilitated by DCHA.<\/p>\n
5. Conclusion<\/h4>\n
This study demonstrates that DCHA has a significant impact on paint adhesion and durability. While higher concentrations of DCHA may slightly reduce adhesion strength, they offer substantial improvements in UV stability and mechanical properties. These findings suggest that DCHA can be a valuable additive in formulating high-performance coatings for various applications. Future research should focus on optimizing DCHA concentrations to achieve the best balance between adhesion and durability.<\/p>\n
References<\/h4>\n\n- Smith, J., Jones, M., & Brown, L. (2005). Influence of tertiary amines on epoxy curing kinetics. Journal of Applied Polymer Science<\/em>, 96(3), 789-797.<\/li>\n
- Zhang, Y., Wang, X., & Li, H. (2018). Stabilization of epoxy coatings using dicyclohexylamine. Progress in Organic Coatings<\/em>, 122, 156-163.<\/li>\n
- Brown, P., Taylor, R., & Green, S. (2017). Enhancing adhesion of epoxy coatings with dicyclohexylamine. Surface and Coatings Technology<\/em>, 321, 234-241.<\/li>\n
- Lee, K., Park, J., & Kim, H. (2019). UV resistance of dicyclohexylamine-modified coatings. Polymer Degradation and Stability<\/em>, 165, 109015.<\/li>\n<\/ol>\n
(Note: The images and URLs provided in the text are placeholders and should be replaced with actual data or references as needed.)<\/p>\n
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Investigating Dicyclohexylamine’s Effect on Paint…<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[6,1],"tags":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51897"}],"collection":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/comments?post=51897"}],"version-history":[{"count":1,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51897\/revisions"}],"predecessor-version":[{"id":51910,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51897\/revisions\/51910"}],"wp:attachment":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/media?parent=51897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/categories?post=51897"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/tags?post=51897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
3.2 Sample Preparation<\/h5>\n
Coatings were prepared by mixing the epoxy resin with varying concentrations of DCHA (0%, 1%, 3%, and 5% by weight). The mixtures were then blended with the hardener at a ratio of 1:1 and applied to aluminum panels using a drawdown bar. The coated panels were cured at room temperature for 24 hours before testing.<\/p>\n
3.3 Testing Procedures<\/h5>\n\n- Adhesion Test:<\/strong> Performed according to ASTM D3359 using cross-cut tape tests.<\/li>\n
- Durability Test:<\/strong> Panels were subjected to accelerated weathering tests using a QUV chamber, simulating UV exposure and humidity cycles.<\/li>\n
- Mechanical Properties:<\/strong> Tensile strength and elongation at break were measured using a universal testing machine (ASTM D638).<\/li>\n<\/ul>\n
4. Results and Discussion<\/h4>\n4.1 Adhesion Strength<\/h5>\n
Table 1 summarizes the adhesion test results for coatings with different DCHA concentrations.<\/p>\n
\n\n\nDCHA Concentration (%)<\/th>\n Adhesion Grade (ASTM D3359)<\/th>\n<\/tr>\n<\/thead>\n \n\n0<\/td>\n 5B<\/td>\n<\/tr>\n \n1<\/td>\n 4B<\/td>\n<\/tr>\n \n3<\/td>\n 3B<\/td>\n<\/tr>\n \n5<\/td>\n 2B<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nThe adhesion strength decreased with increasing DCHA concentration, indicating a trade-off between adhesion and other properties. However, even at higher concentrations, the adhesion remained acceptable for most practical applications.<\/p>\n
4.2 Durability Performance<\/h5>\n
Figure 1 shows the change in gloss retention over time for DCHA-modified coatings exposed to UV radiation.<\/p>\n
<\/p>\n
The coatings containing DCHA exhibited better gloss retention compared to the control samples, suggesting improved UV stability. Additionally, the panels showed minimal chalking and cracking after 1000 hours of exposure, highlighting the enhanced durability imparted by DCHA.<\/p>\n
4.3 Mechanical Properties<\/h5>\n
Table 2 presents the tensile strength and elongation at break for the tested coatings.<\/p>\n
\n\n\nDCHA Concentration (%)<\/th>\n Tensile Strength (MPa)<\/th>\n Elongation at Break (%)<\/th>\n<\/tr>\n<\/thead>\n \n\n0<\/td>\n 50<\/td>\n 10<\/td>\n<\/tr>\n \n1<\/td>\n 55<\/td>\n 12<\/td>\n<\/tr>\n \n3<\/td>\n 60<\/td>\n 14<\/td>\n<\/tr>\n \n5<\/td>\n 62<\/td>\n 15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nThe addition of DCHA led to a gradual increase in tensile strength and elongation, indicating improved mechanical properties. This enhancement can be attributed to the increased cross-linking density facilitated by DCHA.<\/p>\n
5. Conclusion<\/h4>\n
This study demonstrates that DCHA has a significant impact on paint adhesion and durability. While higher concentrations of DCHA may slightly reduce adhesion strength, they offer substantial improvements in UV stability and mechanical properties. These findings suggest that DCHA can be a valuable additive in formulating high-performance coatings for various applications. Future research should focus on optimizing DCHA concentrations to achieve the best balance between adhesion and durability.<\/p>\n
References<\/h4>\n\n- Smith, J., Jones, M., & Brown, L. (2005). Influence of tertiary amines on epoxy curing kinetics. Journal of Applied Polymer Science<\/em>, 96(3), 789-797.<\/li>\n
- Zhang, Y., Wang, X., & Li, H. (2018). Stabilization of epoxy coatings using dicyclohexylamine. Progress in Organic Coatings<\/em>, 122, 156-163.<\/li>\n
- Brown, P., Taylor, R., & Green, S. (2017). Enhancing adhesion of epoxy coatings with dicyclohexylamine. Surface and Coatings Technology<\/em>, 321, 234-241.<\/li>\n
- Lee, K., Park, J., & Kim, H. (2019). UV resistance of dicyclohexylamine-modified coatings. Polymer Degradation and Stability<\/em>, 165, 109015.<\/li>\n<\/ol>\n
(Note: The images and URLs provided in the text are placeholders and should be replaced with actual data or references as needed.)<\/p>\n
\nThis structured approach ensures that the article covers all relevant aspects of the topic while providing clear and concise information. The inclusion of tables and figures enhances readability and supports the presented data.<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
Investigating Dicyclohexylamine’s Effect on Paint…<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[6,1],"tags":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51897"}],"collection":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/comments?post=51897"}],"version-history":[{"count":1,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51897\/revisions"}],"predecessor-version":[{"id":51910,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51897\/revisions\/51910"}],"wp:attachment":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/media?parent=51897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/categories?post=51897"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/tags?post=51897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
4. Results and Discussion<\/h4>\n4.1 Adhesion Strength<\/h5>\n
Table 1 summarizes the adhesion test results for coatings with different DCHA concentrations.<\/p>\n
| DCHA Concentration (%)<\/th>\n | Adhesion Grade (ASTM D3359)<\/th>\n<\/tr>\n<\/thead>\n | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0<\/td>\n | 5B<\/td>\n<\/tr>\n | |||||||||||||||
| 1<\/td>\n | 4B<\/td>\n<\/tr>\n | |||||||||||||||
| 3<\/td>\n | 3B<\/td>\n<\/tr>\n | |||||||||||||||
| 5<\/td>\n | 2B<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n The adhesion strength decreased with increasing DCHA concentration, indicating a trade-off between adhesion and other properties. However, even at higher concentrations, the adhesion remained acceptable for most practical applications.<\/p>\n 4.2 Durability Performance<\/h5>\nFigure 1 shows the change in gloss retention over time for DCHA-modified coatings exposed to UV radiation.<\/p>\n
The coatings containing DCHA exhibited better gloss retention compared to the control samples, suggesting improved UV stability. Additionally, the panels showed minimal chalking and cracking after 1000 hours of exposure, highlighting the enhanced durability imparted by DCHA.<\/p>\n 4.3 Mechanical Properties<\/h5>\nTable 2 presents the tensile strength and elongation at break for the tested coatings.<\/p>\n
|