Fluoropolymer composition for oil pipe
a technology of fluoropolymer and composition, which is applied in the direction of transportation and packaging, mechanical equipment, coatings, etc., can solve the problems of lack of adhesion between the lining and the inability of mechanical restraint on the movement of the lining, and the separation of the lining from the interior surface of the vessel, so as to achieve better adhesion
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example 1
[0031] A series of rotolinings were conducted at oven temperature of 740° F. (380° C.) for 120 min of mold rotation, in which the test panels are 304 stainless steel which has been grit blasted with a blend (16 grit) of alumina particles and glass beads and in which the amount of rotolining composition added to the mold is sufficient to form a lining 90 mils (2.3 mm) thick.
[0032] When the rotolining material consists solely of TFE / PEVE copolymer particles or TFE / PPVE copolymer particles, the resultant lining does not adhere to the interior surface of the mold, in particular to the test panels forming the major interior surface of the mold.
[0033] When the rotolining material is a composition of either copolymer plus 0.5 wt % zinc powder, the resultant linings adhere to the interior surface of the mold, but the adhesion of the TFE / PEVE copolymer-containing lining is substantially greater. The peel strength of the TFE / PEVE copolymer lining is 77.4 lb / in (13.55 kN / m), while the peel s...
example 2
[0036] A series of rotolinings are conducted under the same parameters as Example 1 to compare stabilized TFE / PEVE copolymer with unstabilized TFE / PEVE copolymer. The stabilized TFE / PEVE copolymer particles are prepared by treating the particles of the copolymer with fluorine to obtain the copolymer having less than 10 unstable end groups per 106 carbon atoms. Each rotolining composition contains 1 wt % of the zinc powder. For the carbon steel panels, the peel strength of the unstabilized copolymer-containing lining is 109 lb / in (19.16 kN / m), while for the stabilized copolymer-containing lining, the peel strength is 53 lb / in (9.28 kN / m). Both linings are smooth and bubble-free.
[0037] As the metal powder concentration is increased from 1 wt % for both copolymer compositions, the peel strength diminishes. At 5 wt % zinc powder concentration, the peel strength of the stabilized copolymer-containing lining drops to 14 lb / in (2.45 kN / m).
example 3
[0038] The linings of Examples 1 and 2 are overcoated with stabilized TFE / PPVE copolymer which does not contain any metal powder by adding particles of the copolymer in sufficient amount to the interior of the lined mold to provide an overcoat thickness of 100 mils (2.5 mm). The rotolining temperature is 650° F. (343° C.), and the time of mold rotation is 180 min. The resultant overcoat adheres to the lining (undercoat) and is smooth and bubble-free.
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