tailieunhanh - Effects of additives, pigment and filler on physicomechanical properties and weather resistance of polyurea coatings

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. | Vietnam Journal of Science and Technology 55 (5B) (2017) 153-163 EFFECTS OF ADDITIVES, PIGMENT AND FILLER ON PHYSICOMECHANICAL PROPERTIES AND WEATHER RESISTANCE OF POLYUREA COATINGS Nguyen Thi Bich Thuy1, *, Nguyen Nhi Tru2, Ha Thị Ha3, Bui Thi Thao Nguyen2 1 Faculty of Civil Engineering, University of Transport Technology, 54 Trieu Khuc, Thanh Xuan Bac Ward, Thanh Xuan District, Hanoi, Vietnam Faculty of Materials Technology, University of Technology – VNU HCM, 268 Ly Thuong Kiet, Ward 14, District 10, Ho Chi Minh City, Vietnam 2 3 Phuong Hoang Xanh Joint-stock Company, 167 Hoang Ngan, Trung Hoa Ward, Cau Giay District, Hanoi, Vietnam * Email: thuygiaothong@ Received: 31 August 2017; Accepted for publication: 6 October 2017 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 impact strength, mm elongation, and 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 1. INTRODUCTION Polyurea combines a number of valuable properties such as good scratch and abrasion resistance, high chemical and