CN114857409A - Protective coating system for outer wall of high-risk pipeline - Google Patents
Protective coating system for outer wall of high-risk pipeline Download PDFInfo
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- CN114857409A CN114857409A CN202210496412.3A CN202210496412A CN114857409A CN 114857409 A CN114857409 A CN 114857409A CN 202210496412 A CN202210496412 A CN 202210496412A CN 114857409 A CN114857409 A CN 114857409A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
- F16L58/1027—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe the coating being a sprayed layer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/02—Polyureas
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/1072—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sprayed layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Abstract
The invention belongs to the technical field of pipeline anticorrosive materials, and particularly relates to a protective coating system for the outer wall of a high-risk pipeline. The novel three-layer protective coating structure sequentially comprises a bottom layer epoxy coating, an intermediate adhesive layer and an outer layer polyurea coating from inside to outside, overcomes the defects of poor high and low temperature resistance, easy cathode stripping of the coating, easy hollowing generation, poor repairing performance and the like of a traditional pipeline 3-layer structure polyethylene (3PE) coating, and can meet the requirements of safety protection and emergency rescue of dangerous accidents caused by corrosion of a high-risk pipeline by virtue of excellent corrosion resistance and mechanical performance of the novel three-layer protective coating structure.
Description
Technical Field
The invention belongs to the technical field of pipeline anticorrosive materials, and particularly relates to a protective coating system for an outer wall of a high-risk pipeline.
Background
High-risk pipelines generally refer to pipelines for conveying media such as oil and gas, the internal conveying media mainly act on the inner pipe wall, the influence on the outer pipe wall is small, the outer pipe wall is not effectively treated by an anti-corrosion coating, or the anti-corrosion effect of the anti-corrosion coating is poor, corrosion usually occurs through the action of the environment, leakage occurs seriously, and the public security of people is threatened. The high-risk pipeline is seriously troubled by the corrosion problem, an anticorrosive coating is mainly adopted for corrosion protection, the buried high-risk pipeline is also subjected to corrosion protection in a combined cathodic protection mode, the pipeline coating is used as one of key technologies for corrosion and protection of the pipeline, and the pipeline coating protection is mainly realized by preventing moisture, oxygen and corrosive media in the surrounding environment from entering by using the anticorrosive coating with good insulativity, permeability resistance, impact resistance and other properties, so that the purpose of corrosion resistance is achieved. At present, most of pipeline anticorrosive coatings mainly adopt traditional 3-layer structural polyethylene (3PE), but the traditional 3PE has the following problems: the low temperature resistance is poor, the coating is easy to be stripped from the cathode, and the cathodic protection current can be shielded; the required coating equipment is complex; the repaired mouth of the anticorrosive coating is difficult to be repaired, and the repaired mouth material is difficult to be fused with polyethylene. Moreover, the 3PE pipeline can not solve the potential safety hazard of leakage and explosion of high-risk pipeline conveying media caused by corrosion problems. CN101655179A describes a new coating process for three-layer structural anticorrosive coating of pipeline. According to the process, the coating of the middle adhesive layer is changed into a powder raw material, before the epoxy powder is not completely gelatinized, the electrostatic spraying technology is adopted for spraying, the temperature is controlled to be 170-225 ℃, the thickness is 100-. However, the process can not solve the problems of difficult joint coating of the high-risk pipeline anticorrosive coating, complex process equipment and potential safety hazard.
Disclosure of Invention
The invention provides a protective coating system for the outer wall of a high-risk pipeline, which sequentially comprises a bottom epoxy coating, an intermediate adhesive layer and an outer polyurea coating from inside to outside.
In order to solve the defects in the prior art and effectively improve the corrosion resistance and the safety protection performance of the high-risk pipeline, the invention provides a novel protective coating for the outer wall of the high-risk pipeline and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
a protective coating system for the outer wall of a high-risk pipeline is a three-layer protective system, wherein from inside to outside, the bottom layer is epoxy coating, the middle layer is polyurethane toughened epoxy resin material, and the outer layer is polyurea coating.
The performances of the three protective layers are complemented, the organic protection layer is combined together, the overall performance is greatly improved, and the three protective anti-corrosion material is preferred, particularly as follows:
the bottom epoxy coating is prepared by curing epoxy resin serving as a matrix by an amine curing agent.
Preferably, the primer epoxy coating is cured by the component A and the component B by a conventional method, the two components are mixed according to the mass ratio of 3-8:1, preferably 6:1, and cured at normal temperature; wherein, the component A comprises: bisphenol a type epoxy resin, a diluent, and the like; the component B is preferably a polyamide curing agent.
More preferably, the diluent is a mixture of xylene and butanol, and the mixing ratio is 1-5: 1.
The middle layer polyurethane toughening epoxy resin material is prepared by adding polyether polyurethane material into epoxy resin and curing by amine curing agent.
Preferably, the middle layer polyurethane toughening epoxy resin material is formed by conventionally curing the component A and the component B according to the mass ratio of 1.5-5:1, and more preferably 5: 2; wherein the component A is epoxy resin, preferably bisphenol A epoxy resin; the component B comprises polyether polyurethane and a polyamide curing agent.
The polar group formed by the reaction of the polyurethane toughening epoxy resin material can form intermolecular acting force with the molecules of the bottom layer epoxy coating and the outer layer polyurea coating, and an interpenetrating network structure is formed in the molecules of the polyurethane toughening epoxy resin material, so that the compatibility and the bonding strength of an interface are improved.
The outer layer is made of polyurea coating, preferably, the polyurea coating is prepared by mixing and reacting amine-terminated polyether, amine chain extender and isocyanate or prepolymer thereof at a volume ratio of 1:1 at normal temperature and high speed. The amine-terminated polyether is preferably one or more selected from polypropylene oxide diamine, polypropylene oxide triamine and polytetrahydrofuran diamine, the amine chain extender is selected from one or more selected from aromatic diamine, and the isocyanate or the isocyanate prepolymer is preferably one or more selected from toluene diisocyanate, diphenylmethane diisocyanate and diphenylmethane diisocyanate prepolymer.
The outer coating formed by the polyurea coating has high hardness, good corrosion and water resistance and mechanical properties, forms a barrier for pipelines, bottom epoxy and an intermediate adhesive layer, plays a good role in protecting, and can resist corrosion medium erosion for a long time. The high-temperature-resistant anti-tear anti-explosion pipeline has excellent anti-explosion and anti-tear performance and explosion shock wave absorption performance, and can greatly reduce environmental damage and personnel injury caused by leakage and explosion of a conveying medium in a high-risk pipeline. In addition, the paint also has 100 percent of solid content, does not volatilize organic solvent and meets the requirement of environmental protection; the curing is rapid, the gelation is carried out for a few seconds, the pipeline is continuously sprayed without flowing, and the method is suitable for the construction of a flow line; the coating can be thickly coated, is compact and seamless, and is not easy to damage in the processes of carrying, hoisting, transporting and backfilling; excellent chemical resistance; the salt spray resistance and ultraviolet aging resistance are excellent; the low-temperature curing can be realized, and the construction temperature range is wide; the dielectric strength is high; can perform on-site joint coating, and has the advantages of good adhesive force and sealing performance at the joint coating joint, and the like.
More preferably, according to the cost of each layer of material and the application effect after the compounding of multiple layers, the thickness of each coating layer is respectively designed as follows: the thickness of the bottom layer (epoxy coating layer) is 0.1-0.5 mm; the thickness of the middle layer (the polyurethane toughened epoxy resin layer) is 0.05-0.25 mm; the thickness of the outer layer (polyurea coating layer) is 0.5-5 mm.
The epoxy coating layer and the adhesive layer are both constructed in a spraying or brushing way; the polyurea coating is prepared by adopting a high-pressure reaction spraying process.
In conclusion, the beneficial effects of the invention are as follows:
compared with the traditional 3PE anticorrosive coating, the invention has the advantages that: the novel three-layer protection system has the advantages of simple and convenient construction process and easy operation, each layer has outstanding performance advantages, the bottom epoxy coating has excellent flexibility, adhesive force and cathodic disbonding resistance, the middle-layer adhesive is based on a strong-polarity epoxy resin-based material, and the interface compatibility and the bonding strength can be improved by toughening the polyurethane resin. The outer polyurea coating layer adopts a high-pressure spraying process, can be quickly cured, is simple and convenient to construct, and enables the outer layer of the high-risk metal pipeline to have high mechanical strength and the capability of resisting corrosion medium erosion for a long time. After the three components are compounded according to the method, the metal adhesion of the composite coating is more than 20MPa, the salt spray resistance is more than 3600h, the ultraviolet aging resistance is more than 3600h, the average distance of cathode stripping resistance is less than 6mm, and the lowest distance can reach 3.2 mm.
The outer polyurea coating layer is made of an elastomer material and has excellent low-temperature performance, the low-temperature brittleness of the polyurea elastomer can reach below-65 ℃, and the low-temperature brittleness of epoxy resin in the traditional 3PE structure can reach above-50 ℃. Compared with the PE or PP coating on the outer layer of the 3PE structure, the outer layer polyurea coating has the characteristics of high mechanical strength of the material, excellent explosion-proof tear-resistant performance and excellent explosion shock wave absorption performance, and meanwhile, the coating is high in curing speed and high in construction efficiency.
In addition, the repaired mouth of the traditional 3PE structure often has defects, cathode stripping is easily generated when metal bare leak points appear, so that the adhesion failure of the coating is caused, the polyurea coating is a thick film coating material with certain mechanical strength, and the metal bare leak points caused by the breakage of a local paint film can not appear, so that the cathode stripping can not be generated. In addition, the outer polyurea coating has excellent anti-explosion and anti-tear performance and explosion shock wave absorption performance, can bear certain leakage and explosion pressure of a conveying medium, and reduces the loss degree caused by pipeline leakage.
In conclusion, the bottom layer in the coating system is in direct contact with the pipeline, has better adhesive force and cathodic peeling resistance strength with the pipeline, and is a first defense line for protecting the pipeline from corrosion; the middle layer is a bridge connecting the bottom layer and the outer layer, has better chemical compatibility and adhesive force with the bottom layer and the outer layer, and is a second defense line for protecting the pipeline from corrosion; the outer layer directly contacts with the external use environment and is connected with the middle layer, so that the pipeline protecting device has good mechanical strength, can resist mechanical damage from the outside, and also has strong environmental adaptability, such as ultraviolet aging resistance and salt mist resistance, and in addition, the sealing property is good, so that the pipeline protecting device prevents air and water vapor from permeating, and is a third defense line for protecting the pipeline from corrosion. The three defense lines complement each other, and compared with the prior art, the performance of each aspect is obviously improved!
Drawings
FIG. 1 is a schematic structural diagram of a protective coating system for the outer wall of a high-risk pipeline according to the present invention;
0 is a pipeline, 1 is a bottom layer, 2 is an intermediate layer, and 3 is an outer layer.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but it should not be construed that the scope of the present invention is limited to the examples. All the technologies realized based on the above contents of the present invention belong to the scope of the present invention. Except as otherwise noted, the following examples were carried out using conventional techniques.
In the following examples, the adhesion test was according to GB/T5210-2006, the cathodic disbondment resistance was according to GB/T23257-2017, the salt spray resistance was according to GB/T1771-2007, and the ultraviolet aging resistance was according to GB/T23987-2009.
The various starting materials used in the following examples are conventional commercial products, of which:
zinc phosphate (ZP-10) was supplied by Kahn chemical Co., Ltd, Polyamide curing agent NX2015 was supplied by Weinorway chemical materials Co., Ltd, Shenzhen, Polyamide curing agent 650 and Polyamide curing agent 651 were supplied by Senso Fidada chemical Co., Ltd, polyether urethane SL-102C-2 was supplied by Beijing Shanxi composite plant, diphenylmethane diisocyanate (MDI-50), diphenylmethane diisocyanate (MDI) prepolymer WANNATE8310, 4' -bis-sec-aminodiphenylmethane (WanaLink6200) was supplied by Nicotiana Wanhua urethane Co., Ltd, toluene diisocyanate (T-100) was supplied by Wutian corporation, diphenylmethane diisocyanate (MDI) prepolymer SUPRASEC9480, polyoxypropylene diamine D-2000, polytetrahydrofurandiamine THF-170, Polyoxypropylene triamine T-5000, polyoxypropylene triamine T-3000, polyoxypropylene diamine D-230, polyoxypropylene triamine T-403, polyoxypropylene diamine D-4000, available from Huntsman, USA, 3,5 diethyltoluenediamine (DETDA, E-100), 3,5 dimethylthiotoluenediamine (DMTDA, E-300), available from AlebMarle, USA.
Example 1
And (3) bottom epoxy coating:
the component A comprises: the content of bisphenol A type epoxy resin E51 is 70%, the content of zinc phosphate (ZP-10) is 10%, the content of a mixture of diluent xylene and butanol is 20%, and the mass ratio of xylene to butanol is 1: 1;
and B component: 25% of polyamide curing agent NX2015, 55% of polyamide curing agent 650, 20% of diluent xylene and butanol mixture, and the mass ratio of xylene to butanol is 1: 1;
the mass ratio of the component A to the component B at normal temperature is 3: and 1, curing the synthesized epoxy zinc phosphate primer.
The middle layer polyurethane toughening epoxy resin material:
the component A comprises: bisphenol a epoxy resin E44;
and B component: the content of the polyether polyurethane SL-102C-2 is 10 percent, and the content of the polyamide curing agent 651 is 90 percent.
The mass ratio of the component A to the component B at normal temperature is 1.5: and 1, curing the synthesized interlayer adhesive.
Outer polyurea coating:
the component A comprises: diphenylmethane diisocyanate (MDI-50);
and B component: the content of polyoxypropylene diamine D-2000 was 75.5%, and the content of polytetrahydrofurandiamine THF-170 was 12.5%; the content of 3, 5-diethyltoluenediamine (DETDA, E-100) is 7.5 percent, and the content of 4, 4' -bis-sec-butyl aminodiphenylmethane (WanaLink6200) is 4.5 percent.
The component A and the component B are prepared by mixing in a volume ratio of 1:1,
the surface of the metal substrate is coated by the paint, the bottom layer is sprayed by an aerosol spray gun N71, the thickness of the bottom layer is 0.1mm, the thickness of the middle layer is 0.125mm by brushing, and the outer layer is coated by a HXP3 high-pressure reaction sprayer of the United states Guruyi company, and the spraying thickness is 5 mm.
The metal adhesion of the composite coating is 21.26MPa, and the average cathode stripping distance is 5.3 mm. The salt spray resistance is more than 3600h, and the ultraviolet aging resistance is more than 3600 h.
Example 2
And (3) bottom epoxy coating:
the component A comprises: 55 percent of bisphenol A epoxy resin E44, 25 percent of zinc phosphate (ZP-10), 20 percent of mixture of diluent xylene and butanol, and the mass ratio of the xylene to the butanol is 2: 1;
and B component: the content of a polyamide curing agent NX2015 is 35%, the content of a polyamide curing agent 650 is 45%, the content of a mixture of diluent xylene and butanol is 20%, and the mass ratio of xylene to butanol is 2: 1;
the mass ratio of the component A to the component B at normal temperature is 5: and 1, curing the synthesized epoxy zinc phosphate primer.
The middle layer polyurethane toughening epoxy resin material:
the component A comprises: bisphenol a epoxy resin E51;
and B component: the content of the polyether polyurethane SL-102C-2 is 15 percent, and the content of the polyamide curing agent 651 is 85 percent;
the mass ratio of the component A to the component B at normal temperature is 2: and 1, curing the synthesized interlayer adhesive.
Outer polyurea coating:
the component A comprises: toluene diisocyanate (T-100);
and B component: the content of polyoxypropylene triamine T-5000 was 86.5%, the content of polytetrahydrofurandiamine THF-170 was 8.5%, the content of 3, 5-dimethylthiotoluenediamine (DMTDA, E-300) was 3.5%, and the content of 4, 4' -bis-sec-butylaminodiphenylmethane (WanaLink6200) was 1.5%;
the component A and the component B are prepared by mixing in a volume ratio of 1: 1.
The surface of the metal substrate is coated by the coating, the bottom layer is sprayed by an aerosol spray gun N71, the thickness of the bottom layer is 0.3mm, the thickness of the middle layer is 0.05mm by brushing, and the outer layer is coated by a HXP3 high-pressure reaction sprayer of the United states Guruyi company, and the spraying thickness is 0.5 mm.
The metal adhesion of the composite coating in the embodiment of the market is 21.42MPa, and the average cathode stripping distance is 4.1 mm. The salt spray resistance is more than 3600h, and the ultraviolet aging resistance is more than 3600 h.
Example 3
And (3) bottom epoxy coating:
the component A comprises: 65% of bisphenol A epoxy resin E54, 15% of zinc phosphate (ZP-10), 20% of a mixture of diluent xylene and butanol, and the mass ratio of xylene to butanol is 2.5: 1;
and B component: the content of the polyamide curing agent NX2015 is 30%, the content of the polyamide curing agent 650 is 50%, the content of the mixture of the diluent xylene and butanol is 20%, and the mass ratio of the xylene to the butanol is 2.5: 1.
The mass ratio of the component A to the component B at normal temperature is 7: and 1, curing the synthesized epoxy zinc phosphate primer.
The middle layer polyurethane toughening epoxy resin material:
the component A comprises: bisphenol a epoxy resin E42;
and B component: the content of the polyether polyurethane SL-102C-2 is 15 percent, and the content of the polyamide curing agent 651 is 85 percent.
The mass ratio of the component A to the component B at normal temperature is 2: and 1, curing the synthesized interlayer adhesive.
Outer polyurea coating:
the component A comprises: the content of toluene diisocyanate (T-100) is 50 percent, and the content of diphenylmethane diisocyanate (MDI-50) is 50 percent;
and B component: the content of polyoxypropylene triamine T-3000 was 65.5%, the content of polytetrahydrofurandiamine THF-170 was 23.5%, the content of 3, 5-dimethylthiotoluenediamine (DMTDA, E-300) was 6.5%, and the content of 4, 4' -bis-sec-butylaminodiphenylmethane (WanaLink6200) was 4.5%;
the component A and the component B are prepared by mixing in a volume ratio of 1: 1.
The coating is adopted to coat the surface of the metal substrate, the bottom layer is sprayed by an aerosol spray gun N71, the thickness of the bottom layer is 0.5mm, the middle layer is brushed and coated, the thickness of the middle layer is 0.25mm, the outer layer is coated by a HXP3 high-pressure reaction spraying machine of the United states Guruyi company, and the spraying thickness is 3 mm.
The metal adhesion of the composite coating is 21.63MPa, and the average cathode stripping distance is 5.5 mm. The salt spray resistance is more than 3600h, and the ultraviolet aging resistance is more than 3600 h.
Example 4
And (3) bottom epoxy coating:
the component A comprises: the content of bisphenol A type epoxy resin E42 is 70%, the content of zinc phosphate (ZP-10) is 10%, the content of a mixture of diluent xylene and butanol is 20%, and the mass ratio of xylene to butanol is 3: 1;
and B component: the polyamide curing agent NX2015 content is 25%, the polyamide curing agent 650 content is 55%, the diluent xylene and butanol mixture content is 20%, and the mass ratio of xylene to butanol is 3: 1.
The mass ratio of the component A to the component B at normal temperature is 6: and 1, curing the synthesized epoxy zinc phosphate primer.
The middle layer polyurethane toughening epoxy resin material:
the component A comprises: bisphenol a epoxy resin E54;
and B component: the content of the polyether polyurethane SL-102C-2 is 25 percent, and the content of the polyamide curing agent 651 is 75 percent;
the mass ratio of the component A to the component B at normal temperature is 5: and 2, curing the synthesized interlayer adhesive.
Outer polyurea coating:
the component A comprises: diphenylmethane diisocyanate (MDI) prepolymer WANNATE 8310;
and B component: the content of polyoxypropylene diamine D-230 was 11.5%, the content of polyoxypropylene triamine T-3000 was 63.5%, the content of 3, 5-diethyltoluenediamine (DETDA, E-100) was 13.5%, and the content of 4, 4' -bis-sec-butylaminodiphenylmethane (WanaLink6200) was 11.5%;
the component A and the component B are prepared by mixing in a volume ratio of 1: 1.
The coating is adopted to coat the surface of the metal substrate, the bottom layer is sprayed by an aerosol spray gun N71, the thickness of the bottom layer is 0.3mm, the middle layer is brushed and coated, the thickness of the middle layer is 0.125mm, the outer layer is coated by a HXP3 high-pressure reaction sprayer of the United states Guruyi company, and the spraying thickness is 3 mm.
The metal adhesion of the composite coating is 23.15MPa, and the average cathode stripping distance is 3.2 mm. . The salt spray resistance is more than 3600h, and the ultraviolet aging resistance is more than 3600 h.
Example 5
And (3) bottom epoxy coating:
the component A comprises: 50% of bisphenol A type epoxy resin E42, 10% of bisphenol A type epoxy resin E20, 10% of zinc phosphate (ZP-10), 30% of a mixture of a diluent xylene and butanol, and a mass ratio of the xylene to the butanol of 4: 1;
and B component: the content of the polyamide curing agent NX2015 is 10 percent, the content of the polyamide curing agent 650 is 60 percent, the content of the mixture of the diluent xylene and the butanol is 30 percent, and the mass ratio of the xylene to the butanol is 4:1
The mass ratio of the component A to the component B at normal temperature is 7.5: and 1, curing the synthesized epoxy zinc phosphate primer.
The middle layer polyurethane toughening epoxy resin material:
the component A comprises: 90% of bisphenol A epoxy resin E54 and 10% of bisphenol A epoxy resin E12;
and B component: the content of the polyether polyurethane SL-102C-2 is 30 percent, and the content of the polyamide curing agent 651 is 70 percent;
the mass ratio of the component A to the component B at normal temperature is 4: and 1, curing the synthesized interlayer adhesive.
Outer polyurea coating:
the component A comprises: diphenylmethane diisocyanate (MDI) prepolymer SUPRASEC9480
And B component: the content of polyoxypropylene diamine D-2000 was 79.6%, the content of polyoxypropylene triamine T-403 was 11.4%, the content of 3, 5-dimethylthiotoluenediamine (DMTDA, E-300) was 5.9%, and the content of 4, 4' -bis-sec-butylaminodiphenylmethane (WanaLink6200) was 3.1%;
the component A and the component B are prepared by mixing in a volume ratio of 1: 1.
The surface of the metal substrate is coated by adopting the paint, the bottom layer is sprayed by adopting an aerosol spray gun N71, the thickness of the bottom layer is 0.1mm, and the middle layer is brushed. The thickness of the middle layer is 0.05mm, and the outer layer is coated by a HXP3 high-pressure reaction spraying machine of the United states Gurueli company, and the spraying thickness is 0.5 mm.
The metal adhesion of the composite coating is 21.12MPa, and the average cathode stripping distance is 5.2 mm. The salt spray resistance is more than 3600h, and the ultraviolet aging resistance is more than 3600 h.
Example 6
And (3) bottom epoxy coating:
the component A comprises: 55% of bisphenol A epoxy resin E44, 10% of bisphenol A epoxy resin E12, 10% of zinc phosphate (ZP-10), 25% of a mixture of xylene and butanol serving as a diluent, wherein the mass ratio of the xylene to the butanol is 5: 1;
and B component: the polyamide curing agent NX2015 content is 20%, the polyamide curing agent 650 content is 45%, the diluent xylene and butanol mixture content is 25%, and the mass ratio of xylene to butanol is 5: 1;
the mass ratio of the normal-temperature component A to the component B is 8: and 1, curing the synthesized epoxy zinc phosphate primer.
The middle layer polyurethane toughening epoxy resin material:
the component A comprises: 90% of bisphenol A epoxy resin E51 and 10% of bisphenol A epoxy resin E20;
and the component B comprises: the content of the polyether polyurethane SL-102C-2 is 35 percent, and the content of the polyamide curing agent 651 is 65 percent;
the mass ratio of the component A to the component B at normal temperature is 5: and 1, curing the synthesized interlayer adhesive.
Outer polyurea coating:
the component A comprises: diphenylmethane diisocyanate (MDI) prepolymer SUPRASEC 9480;
and B component: the content of polyoxypropylene diamine D-4000 was 59.5%, the content of polyoxypropylene triamine T-403 was 12.5%, the content of 3, 5-diethyltoluenediamine (DETDA, E-100) was 15.5%, and the content of 4, 4' -bis-sec-butylaminodiphenylmethane (WanaLink6200) was 12.5%;
the component A and the component B are prepared by mixing in a volume ratio of 1:1
The surface of the metal substrate is coated by the coating, the bottom layer is sprayed by an aerosol spray gun N71, the thickness of the bottom layer is 0.5mm, the thickness of the middle layer is 0.25mm by brushing, and the outer layer is coated by a HXP3 high-pressure reaction sprayer of the United states Guruyi company, and the spraying thickness is 5 mm.
The metal adhesion of the composite coating is 21.53MPa, and the average cathode stripping distance is 5.6 mm. The salt spray resistance is more than 3600h, and the ultraviolet aging resistance is more than 3600 h.
Comparative example 1
Only the single-layer structure of the outermost polyurea coating is selected, and the formula adopts:
the component A comprises: diphenylmethane diisocyanate (MDI) prepolymer SUPRASEC 9480;
and B component: the content of polyoxypropylene diamine D-4000 was 59.5%, the content of polyoxypropylene triamine T-403 was 12.5%, the content of 3, 5-diethyltoluenediamine (DETDA, E-100) was 15.5%, and the content of 4, 4' -bis-sec-butylaminodiphenylmethane (WanaLink6200) was 12.5%;
the component A and the component B are prepared by mixing in a volume ratio of 1: 1.
The spraying thickness is 3 mm. The coating was carried out using a HXP3 model high pressure reaction spray coater from the United states of America and Turkish Co.
The metal adhesion of the composite coating is 5.15MPa, and the average cathode stripping distance is 12.4 mm. Compared with the three layers, the adhesive force is greatly reduced, the cathodic disbonding resistance distance is increased, and the cathodic disbonding resistance is greatly reduced. The salt spray resistance is more than 2000h, and the ultraviolet aging resistance is more than 2000 h.
Comparative example 2
Only the single-layer structure of the outermost polyurea coating is selected, and the formula adopts:
the component A comprises: diphenylmethane diisocyanate (MDI) prepolymer SUPRASEC 9480;
and B component: the content of polyoxypropylene diamine D-4000 was 59.5%, the content of polyoxypropylene triamine T-403 was 12.5%, the content of 3, 5-diethyltoluenediamine (DETDA, E-100) was 15.5%, and the content of 4, 4' -bis-sec-butylaminodiphenylmethane (WanaLink6200) was 12.5%;
the component A and the component B are prepared by mixing in a volume ratio of 1:1
The thickness is 5mm, and the coating construction is carried out by adopting a HXP3 high-pressure reaction spraying machine of the United states of America Gurelix company.
The metal adhesion of the composite coating is 4.15MPa, and the average cathode stripping distance is 15.2 mm. Compared with the three layers, the adhesive force is greatly reduced, the cathodic disbonding resistance distance is increased, and the cathodic disbonding resistance is greatly reduced. The salt spray resistance is more than 2000h, and the ultraviolet aging resistance is more than 2000 h.
Comparative example 3
The outermost layer of polyurea coating and the bottom layer of epoxy two-layer structure are selected,
and (3) bottom epoxy coating:
and (2) component A: the content of bisphenol A type epoxy resin E42 is 70%, the content of zinc phosphate (ZP-10) is 10%, the content of a mixture of diluent xylene and butanol is 20%, and the mass ratio of xylene to butanol is 3: 1;
and B component: the polyamide curing agent NX2015 content is 25%, the polyamide curing agent 650 content is 55%, the diluent xylene and butanol mixture content is 20%, and the mass ratio of xylene to butanol is 3: 1.
The mass ratio of the component A to the component B at normal temperature is 6:1, curing the synthesized epoxy zinc phosphate primer, wherein the spraying thickness is 0.3 mm.
Outer polyurea coating:
the component A comprises: diphenylmethane diisocyanate (MDI) prepolymer SUPRASEC 9480;
and B component: the content of polyoxypropylene diamine D-4000 was 59.5%, the content of polyoxypropylene triamine T-403 was 12.5%, the content of 3, 5-diethyltoluenediamine (DETDA, E-100) was 15.5%, and the content of 4, 4' -bis-sec-butylaminodiphenylmethane (WanaLink6200) was 12.5%.
The A component and the B component are prepared by mixing in a volume ratio of 1:1, and the thickness is 5 mm. The coating was carried out using a HXP3 model high pressure reaction spray coater from the United states of America and Turkish Co.
The metal adhesion of the composite coating is 18.56MPa, and the average cathode stripping distance is 11.2 mm. Compared with three layers, the adhesive force strength is not as good as that of a three-layer structure, the cathodic disbonding resistance distance is increased, and the cathodic disbonding resistance is greatly reduced. The salt spray resistance is more than 2000h, and the ultraviolet aging resistance is more than 2000 h.
Claims (8)
1. The protective coating system for the outer wall of the high-risk pipeline is characterized by being a three-layer protective system, wherein from inside to outside, the bottom layer is epoxy coating, the middle layer is polyurethane toughening epoxy resin material, and the outer layer is polyurea coating.
2. The protective coating system of claim 1, wherein the base layer has a thickness of 0.1 to 0.5 mm; the thickness of the middle layer is 0.05-0.25 mm; the thickness of the outer layer is 0.5-5 mm.
3. The protective coating system of claim 1, wherein the primer epoxy coating is an epoxy resin as a matrix and is cured by an amine curing agent; the middle layer polyurethane toughening epoxy resin material is prepared by adding polyether polyurethane material into epoxy resin and curing by amine curing agent; the outer layer is prepared by mixing and reacting amine-terminated polyether, amine chain extender and isocyanate or prepolymer thereof at a volume ratio of 1:1 at a high speed at normal temperature to prepare the polyurea coating.
4. The protective coating system according to claim 1 or 3, wherein the primer epoxy coating is cured by the component A and the component B, the two components are mixed according to the mass ratio of 3-8:1, and the curing is carried out at normal temperature; wherein, the component A comprises: bisphenol a type epoxy resin, a diluent; the component B is a polyamide curing agent.
5. The protective coating system of claim 4, wherein the A component and the B component are cured and mixed in a ratio of 6: 1; the diluent is a mixture of xylene and butanol, and the mixing ratio is 1-5: 1.
6. The protective coating system of claim 1 or 3, wherein the polyurethane toughened epoxy resin material of the middle layer is formed by curing a component A and a component B according to the mass ratio of 1.5-5: 1; wherein the component A is bisphenol A type epoxy resin; the component B comprises polyether polyurethane and a polyamide curing agent.
7. The protective coating system of claim 6, wherein the intermediate layer polyurethane toughened epoxy resin material is cured from the component A and the component B according to a mass ratio of 5: 2.
8. The barrier coating system according to claim 3, wherein the amine-terminated polyether is one or more selected from the group consisting of polyoxypropylene diamine, polyoxypropylene triamine and polytetrahydrofuran diamine, the isocyanate or isocyanate prepolymer is one or more selected from the group consisting of toluene diisocyanate, diphenylmethane diisocyanate and diphenylmethane diisocyanate prepolymer, and the amine chain extender is one or more selected from the group consisting of aromatic diamine.
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