Solvent-free epoxy internal anti-drag coating for natural gas pipeline
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A natural gas pipeline, solvent-free technology, applied in the direction of epoxy resin coating, coating, etc., can solve the problem of low density of paint film, achieve the effect of excellent performance, lower requirements, convenient production and construction
Active Publication Date: 2014-05-28
BC P INC CHINA NAT PETROLEUM CORP +2
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[0008] The purpose of the present invention is to provide a kind of two-component solvent-free epoxy coating without volatile solvents used for drag-reducing coatings in long-distance natural gas pipelines, so as to solve the safety, Problems of environmental protection and low density of paint film
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Embodiment 1
[0026] This example consists of components A and B. The ratio of component A is: in 100% by weight, the film-forming resin with an average equivalent weight of 210 accounts for 45%, the dispersant accounts for 0.3%, the active diluent accounts for 21.9%, the anti-settling agent accounts for 0.5%, and the leveling agent accounts for 45%. 0.4%, coupling agent 0.6%, defoamer 0.3%, pigment 11%, wollastonite powder 9%, silica powder 6%, barium sulfate 5%.
[0027] The curing agent of component B accounts for 24% of the total weight of component A.
[0028] The performance test results of the materials are shown in Table 2:
[0029] Table 2 Performance test results of solvent-free epoxy internal drag-reducing coatings
[0030]
[0031]
Embodiment 2
[0033] This example consists of components A and B. The ratio of component A is 100% by weight, the film-forming resin with an average equivalent weight of 180 accounts for 53%, the dispersant accounts for 0.3%, the active diluent accounts for 15.8%, the anti-settling agent accounts for 0.2%, and the leveling agent accounts for 0.5%, coupling agent 0.7%, defoamer 0.5%, pigment 10%, wollastonite powder 9%, silica powder 5%, barium sulfate 5%;
[0034] The curing agent of component B (651 curing agent) accounts for 30% of the total weight of component A.
[0035] The performance test results of the materials are shown in Table 3:
[0036] Table 3 Performance test results of solvent-free epoxy internal drag-reducing coatings
[0037]
[0038]
[0039] After many tests in this example, the coating is safe and environmentally friendly in construction, has strong adhesion to steel, and has good chemical resistance, which can ensure the quality of drag reduction in long-dista...
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Abstract
The invention relates to solvent-free epoxy internal anti-drag coating for a natural gas pipeline. A component A consists of the materials in percentage by weight: 45-55 percent of liquid bisphenol-A epoxy resin, 0.3-0.5 percent of a dispersing agent, 15-25 percent of an active diluent, 0.5-1.0 percent of an anti-settling agent, 0.3-0.5 percent of a flattening agent. 0.5-1.0 percent of a coupling agent, 0.3-0.7 percent of a defoaming agent, 10-20 percent of paint, 8-15 percent of wollastonite powder, 5-10 percent of silicon fine powder and 5-15 percent of barium sulfate, wherein the total percent of the materials in the component A is 100 percent; a component B is a polyacrylic acid curing agent; the weight ratio of the component A to the component B is (100:24)-(100:35). The coating disclosed by the invention solves the problem that the conventional coating layer is low in toughness, the viscosity of the coating is lowered, and requirements for a coating production technology and construction conditions are lowered; the coating is high in shearing strength and adhesive force.
Description
technical field [0001] The invention relates to a solvent-free epoxy internal drag reduction coating for natural gas pipelines, which is used for corrosion prevention of metal materials and internal drag reduction of pipelines. Background technique [0002] With the development of long-distance natural gas pipelines in the direction of large diameter, high steel grade and high pressure, internal coating drag reduction technology has been widely used at home and abroad to increase gas transmission capacity and reduce transmission costs. At present, the drag-reducing coatings in long-distance natural gas pipelines are mainly solvent-based epoxy coatings, with a solid content of about 50%. Most of the resins are solid resins, and the curing agent is polyamide. [0003] Existing solvent-based epoxy internal drag-reducing coatings usually consist of component A containing film-forming resin, organic solvent, pigments and fillers, functional additives, etc., and component B contai...
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