Method for forming a scale preventive coating film on inner wall

Details Method for forming a scale preventive coating film on inner wall Method for forming a scale preventive coating film on inner wall

1994-10-27

1996-08-06

Dudash, Diana

Coating processes

Interior of hollow article coating

Spraying

427235, 427238, 427295, B05D 722, B05D 102

Patent

active

055431755

ABSTRACT:
The method of the present invention lies in a method for forming a scale preventive coating for preventing polymer scale deposition generated on inner walls of a polymerization vessel during polymerization, wherein a coating liquid containing a scale preventive agent is sprayed from an upper portion in the closed polymerization vessel, suction of gas in the vessel is simultaneously performed from a bottom portion of the polymerization vessel, an excessive coating liquid is discharged, and a coating of the scale preventive agent is formed on inner walls of the polymerization vessel. According to this method, a coating of a scale preventive agent can be uniformly formed throughout the entire inner walls of a polymerization vessel even in the case of a closed and large polymerization vessel having a volume, for example, not less than 80 m.sup.3. Especially, it is extremely suitable for large scale industrial production because a coating can be effectively formed even on portions such as a valve at the bottom of the polymerization vessel. Further, operations (heating, spraying, suction) for coating formation can be allowed to proceed simultaneously, and discharge of an excessive coating liquid is simultaneously performed. Thus it also becomes possible to greatly reduce the time required for the coating formation operations.

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