| 摘要 |
FIELD: protection coatings. SUBSTANCE: invention relates to protection of steel products, in particular to automatically sprayed coatings applied onto prime layer and intended for protecting tubes, stop equipment, various-type containers operated both in underground and open-air conditions. Composition contains adduct with active hydrogen atoms obtained by reaction of epoxide oligomer or epoxide oligomer mixture with epoxide number 3.1-3.9 mg-equ/g, mixture of aromatic amines with amine number 9.0-10.4 mg-equ/g, and middle fraction of coal or shale resin with viscosity 18-25 cSt and basicity 1.3-1.5 mg-equ/g HCl. Solidification of adduct is accomplished with the aid of any polyurethane oligomer with 12-14% HCO groups. Impact strength of coating within temperature range from -40 C to +40 C is 15-24 J, adhesion after 1000 h holding in water at 50 C is at least 4 MPa, swelling in water at 80 C is 1.3-4%, vitality time 3-12 sec, resistance to cathode peeling after 3-day ageing at 60 C in NaCl solution is 4.5-9.5 sq.cm. EFFECT: optimized chemical analysis of coating composition. 5 cl, 3 tbl, 10 ex |
