MỐI QUAN HỆ GIỮA HÀM LƯỢNG NHÓM ISOCYANAT TRONG PREPOLYME VỚI MỘT SỐ TÍNH CHẤT CỦA LỚP PHỦ POLYUREA
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Tóm tắt
RELATIONSHIP BETWEEN THE CONTENT OF THE NCO GROUP IN PREPOLYMER AND PHYSICOMECHANICAL PROPERTIES OF POLYUREA COATING
Polyurea is prepared from a prepolymer based on isophorone isocyanate and a polyamine mixture, a volume ratio and molar ratio of NCO:NH2 = 1:1. The relationship between the content of NCO group in the prepolymer and some physicomechanical properties of polyurea has been studied; when the NCO group content decreases, the elongation increases, the hardness and tensile strength decrease, is caused the influence of the soft segment (PPG) in the prepolymer when the soft segment increases, the polyurea film becomes more flexible and elastic.
Từ khóa
Prepolymer, polyamine, polyurea, hàm lượng nhóm NCO, tính chất cơ lý
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Tài liệu tham khảo
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