Lubricating coating composition suitable for tubular threaded joints
A lubricating coating and composition technology, applied in the field of lubricating coating compositions, can solve the problems of deteriorating working environment, environmental pollution, reducing the operating efficiency of OCTG installation, etc., and achieve the effects of improving sealing performance and high biodegradability
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Embodiment 1
[0123] A lubricating coating composition was prepared, which contained 25% mineral spirits as a dissolution medium, 50% (66.7 parts) of basic calcium sulfonate with a base value of 400 mg-KOH / g as a basic lubricant, and 17% ( 22.7 parts) of calcium stearate and 8% (10.6 parts) of petrolatum wax, both as additional lubricants. The parts in parentheses are the amounts of the respective components in parts by mass based on 100 parts by mass of the total amount of components in the composition excluding the dissolution medium.
Embodiment 2
[0127] A lubricious coating composition was prepared which contained no dissolution medium but contained 65% of the same basic calcium sulfonate as used in Example 1 as a basic lubricant, and 23% of calcium stearate and 12% of Petrolatum wax, both act as other lubricants.
[0128] Since this lubricating coating composition does not contain a dissolving medium, it has a high viscosity at room temperature, it is preheated to 60°C to reduce its viscosity, and then applied by brushing on the surface to be used for repeated fastening and loosening tests On the surface of the test box of the test threaded joint and on the surface of the test plate for the salt spray test. On the other hand, due to the absence of a dissolution medium, it has good biodegradability, and the biodegradability of the entire lubricating coating composition in seawater (BOD 28 ) was 36%, which is well above the minimum acceptable value of 20%, and higher than the value of the composition of Example 1 conta...
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