Process for coating polyurethane on inner and outer surface of nodular graphite cast iron pipe
A technology for ductile iron pipes, inner and outer surfaces, applied to devices for coating liquids on surfaces, pretreatment surfaces, coatings, etc., can solve the problems of poor wear resistance, poor salt spray resistance, poor acid and alkali resistance, etc. Wide temperature range, no pollution in ecological environment, outstanding effect of medium resistance
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[0006] Process flow diagram of the present invention is:
[0007]
[0008] The process steps of the present invention are successively: 1, surface treatment. (1) The outer surface is shot blasted. The outer surface of the pipe must be degreased and derusted to Sa2.5 level; (2) The inner surface is polished. There are many casting defects such as protrusions on the inner surface of the pipe, which must be smoothed before spraying. 2. Repair the surface of the pipeline. For larger defects on the surface of the pipeline, such as pits with a diameter greater than 2mm, the pits need to be filled with putty. 3. Pipeline heating, the best heating temperature is 20-80°C. 4. Spraying the inner surface. When the temperature of the pipeline reaches the requirement, start the high-pressure airless spraying machine, and the spraying trolley drives the spray gun to spray at a constant speed. The spraying process parameters are shown in Table 1. 5. Spraying on the outer surface. When th...
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