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Application of nitrile butadiene rubber for flexible, chemically protective coating
Author(s) -
Hoontrakul Pat,
Szamosi Janos,
Tobing Singa D.
Publication year - 1988
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760281607
Subject(s) - materials science , nitrile rubber , coating , natural rubber , composite material , viscosity , rheology , ultimate tensile strength , tear resistance , bentonite , polymer , acrylonitrile , chemical engineering , copolymer , engineering
Rheological properties of toluene solutions of nitrile butadiene rubber, of different molecular weights (M w , 290,000,320,000, and 450,000) and acrylonitrile contents (30 and 40 percent), were investigated at low (0.1 S −1 ) to medium (20,0 S −1 ) shear rates, in order to determine their feasibility for dip‐coating applications. The effect of a surface‐active additive, bentonite, and the solid content (15 and 20 wt percent) on solution viscosity was of main interest. At low zero‐shear viscosity (<50 Pa·S) an excessive sagging of the wet film was experienced; at high zeroshear viscosity (>100 Pa‐·S) the coating showed poor leveling. Zeroshear viscosity was found to be less affected by bentonite than oligomer‐based solutions, at the same time, the solid content and the molecular weight of the polymer had more pronounced effects. With a proper balance of the parameters, seamless coating films were achieved, with excellent tensile and tear properties, and good permeation resistance against benzene.