EFFECTS OF ADDITIVES, PIGMENT AND FILLER ON PHYSICO- MECHANICAL PROPERTIES AND WEATHER RESISTANCE OF POLYUREA COATINGS

Nguyen Thi Bich Thuy

Abstract


Polyurea coatings are known to provide high hardness, stable color, excellent weather durability and good scratch resistance. Being cured, the coatings can also express heat resistance up to 150 oC, good resistance to acids, oils, as well as other chemicals, high flexibility and strain, excellent adhesion to various substrate materials such as concrete, steel, ceramic, glass and others. In this paper, a polyurea coating has been developed on basis of polyaspartic acid esters and polyisocyanate curing agent, using 3 % nanoclay additive. The physical, mechanical, and chemical properties of the coatings were examined by current technical specifications. The results for developed coating were recorded as follow: 76 in.lb impact strength, 7.5 mm elongation, and 0.7 relative hardness; no blistering was observed after 30 days of immersion in  5 % HCl and 5 % NaOH solutions. Weather resistance of the coatings was also evaluated with full absence of peeling, blistering and high gloss retention after 500 h accelerated UV testing.


Keywords


polyurea, polyaspartic acid esters, nanoclay, weather resistance

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DOI: https://doi.org/10.15625/2525-2518/55/5B/12221 Display counter: Abstract : 94 views. PDF : 132 views.

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Published by Vietnam Academy of Science and Technology