FIELD: protective coatings.
SUBSTANCE: invention relates to chemical engineering processes, in particular to solve problem of protecting metallic equipment against operation deposits of solid and viscous products. Coating is constituted by adhesive primer deposited on metallic surface of process equipment and 3-4-layered coating made from powdered polytetrafluoroethylene or polytrifluorochloroethylene dried to moisture content not higher than 3% and stabilized in acetylene medium by moistening polymer powder with Diaphene HH stabilizer in acetone solution at 40°C, followed by drying polymer/stabilizer mixture at ambient temperature, finally drying at 80-100°C for 5 h, calcination at 210°C for 1 h, and ageing at 220-230°C for 5-6 h. Formation of polymer comprises applying polymer onto metallic surface of process equipment preliminarily thoroughly cleaned via shot blasting treatment, flattened, degreased, heated, and hardened. Inhibiting coating is made from powdered polytetrafluoroethylene or polytrifluorochloroethylene stabilized by afore-indicated way, dried to moisture content not higher than 3% and applied in 3-4 layers onto adhesive primer in electrostatic field and finally held for 5-6 h at 220-230°C.
EFFECT: prolonged lifetime of coating and prevented working surfaces of process equipment from formation of deposits.
3 cl, 2 ex
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0 |
|
SU537098A1 | |
POLYMERIC COMPOSITION | 0 |
|
SU857177A1 |
POWDER POLYMER COMPOSITION FOR COATING | 0 |
|
SU599529A1 |
POLYMERIC COMPOSITION | 0 |
|
SU819129A1 |
Authors
Dates
2006-02-10—Published
2003-08-15—Filed