Effect of Dry-Wet Circulation and Temperature Change on Properties of Polyurea Coatings

Abstract:

This paper mainly studies the mechanical properties and microstructure of polyurea coatings (SPUA) through the experiment of dry-wet circulation. The influence of different curing time of SPUA coating before and after the dry cycle of the mechanical properties and surface morphology changes were researched. Use the alternating temperature and low bending tests to research,the variation of temperature changes to the SPUA of different curing time. The result of the dry-wet circulation experiment shows that the tensile strength of cured 1d, 3d and 7d SPUA coating after 30d dry-wet circulation increased 9.6%、19.2% and 44.7% respectively, the tear strength increased 3.2%、5.6% and 47.3% respectively. The microstructure research shows the 7d cured SPUA coating after 30 times dry-wet circulation will reduce the holes and narrow the hole diameter in a certain degree. The temperature change experimental results show that during -20 ～50 alternating temperature process, the tensile strength of the coating appears to increase, 3d and 7d cured SPUA coating after 40d temperature alternating tensile strength changing rate is -14.2% and 9.8% respectively. Low-temperature bending test shows that the SPUA coating will not appear any cracks cracking phenomena after placed the coating in （-20+2 ）for 168h.

• Periodical: Advanced Materials Research (Volumes 150-151)
• Pages: 1203-1208
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.150-151.1203
• Online since: October 2010
• Authors: Ping Lyu, Xin Mao Li, Wei Bo Huang
• Keywords: Alternating Temperature, Dry-Wet Circulation, Low Temperature Test, Microstructure, Polyurea Coating

References

[1] Weibo Huang. Spray Polyurea Elastomer Technology. Beijing: chemical industry press, 2005. 109-113. (In Chinese).

[2] Ping Lv, Guohua Chen, Weibo Huang. Study on Synthesis, Morphology and Preperties of Novel Based on Polyaspartic Esters. Journal of Chemical Engineering of Chinese Universities, 2008, 22(1): 106-112. (In Chinese).

[3] Ping Lv, Guohua Chen, Weibo Huang. Gather aspartic acid ester of polyurea dynamic mechanical behavior of Wuhan University of Technology. 2007, 29 (4): 61-63. (In Chinese).

[4] Ping Lv, Weibo Huang, Guohua Chen. New gather aspartic acid ester polyurea structure and performance of synthetic rubber industrial research. 2007, 30, (4) : 347-245. (In Chinese).

[5] Shanxi Institute of Chemical Engineering. Polyurethane Elastomer Manual, Beijing: chemical industry press, 2001. 107-109. (In Chinese).

[6] Ping Lv, Guohua Chen, Weibo Huang. New gather l-aspartic acid ester synthesis aliphatic polyurea coatings. Polymer Materials Science and Engineering. 2007, 3 (3): 55-58. (In Chinese).

[7] Ping Lv, Guohua Chen, Weibo Huang. Research on the Morphology and Properties of Polyaspartic Ester Polyurea with Different Hard Segment Contents, Modern Chemical Induster, 2006, 26(9): 28-31. (In Chinese).