CN101769409B - Method for F46 roller coating on inner surface of metal pipe - Google Patents
Method for F46 roller coating on inner surface of metal pipe Download PDFInfo
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- CN101769409B CN101769409B CN2009102168504A CN200910216850A CN101769409B CN 101769409 B CN101769409 B CN 101769409B CN 2009102168504 A CN2009102168504 A CN 2009102168504A CN 200910216850 A CN200910216850 A CN 200910216850A CN 101769409 B CN101769409 B CN 101769409B
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- roller coating
- dispersing agent
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Abstract
The invention relates to a method for F46 roller coating on inner surface of a metal pipe, comprising the following steps: preprocessing a metal pipe or a pipe fitting; carrying out roller coating with Fluorinated ethylene propylene (F46 or FEP) as a main anti-corrosion material, isopropanol and fluorine-containing alkyl alcohol as composite dispersing agent, and polyphenylene sulfide, F46 and silane coupling agent as blending dispersive liquid; carrying out roller coating on intermediate layer and surface layer repeatedly with F46 dispersive liquid; and carrying out sinter molding to obtain the metal pipe or pipe fitting characterized with high bonding force, thick coating and strong anti-corrosion. The invention is especially applied to strongly-corruptive medium, high temperature, vacuum and other application in chemical industry, pharmacy, etc.
Description
Technical field:
The present invention relates to the preparation method of a kind of anti-corrosion pipeline or pipe fitting, relate to the method for metallic conduit or pipe fitting internal surface roller coating F46 in particular, this pipeline or pipe fitting are mainly used in the strong slender pipeline of corrosivity.
Background technique:
Metal erosion is a great problem.China every year, up to ten million ton metals were consumed because of corrosion has caused, and wherein corrosive pipeline has accounted for sizable ratio.Especially in industries such as chemical industry, petrochemical industry, owing to the corrosion of industrial media (acid, alkali, salt) to base material, the leakage and the destruction that might cause equipment, pipeline are at any time brought serious threat to ordinary production.So far to the corrosion protection problem of slender pipeline inwall under high temperature, negative pressure, strong corrosive medium operating mode, also fundamentally do not find the way of effectively dealing with problems.
(per) fluoropolymer is the material that resistance to chemical attack is the strongest, can under higher temperature, use, and comprises polytetrafluoroethylene (PTFE), perfluoroethylene-propylene (FEP), Meltability polytetrafluorethyletubular (PFA) etc.As equipment inside liner material, be widely used.But, because common PTFE difficult forming can only be made lining, because of its difficult dispersion can't be used as equipment pipe coating; PFA is very expensive, is not suitable for general industry and uses.Commercial Application is processed PTFE in entwining tube or the pushing pipe and is lining in inner-walls of duct, has obtained antiseptic effect preferably.But also there are some major defects in the PTFE internal lining pipe: because fluoroplastic are different with the expansion coefficient of tube metal material; Internal lining pipe is long more; The differences in expansion of the two is big more, and " shelling distortion " just very easily takes place, and causes because of the maintenance of being forced to stop production of the corrosion leakage of soda acid; Twine internal lining pipe even can be extruded and break and can't use, cause heavy losses.
Apply steel-plastic composite pipe with F46 and replace the PTFE internal lining pipe; Can solve the strong acid and strong base etching problem of inner-walls of duct under high temperature, condition of negative pressure preferably; Again because the F46 coating is thinner; Can expand with heat and contract with cold with metal tube, thus perfect solution fluoroplastic and metal because of different expansion coefficient differences cause in the phenomenon of lined with fluoroplastic tracheal rupture.
Chinese patent CN1210127 sprays to workpiece surface with polyphenylene sulfide dry powder and F46 powder mixture.It has solved the difficult problem of the strong binding between plastic coating of fluoride and metallic matrix.It is to utilize polyphenylene sulfide both with metal good cohesive force to be arranged; With perfluoroethylene-propylene good blend property is arranged again, be prone to form this characteristic of Fluoroine-containing plastic alloy, progressively to change the spraying method of the two proportioning; Form a transition layer, fluoroplastic are formed powerfully with intermetallic combine.This method can be used for the occasion of anti-strong corrosive medium in the petrochemical equipment, but is not suitable for pipeline construction, and its thickness in monolayer is less than 25 microns, spray-plastics processing just can reach heavy corrosion-resistant requirement for tens layers.
Chinese patent 90107631.7 (application number) adopts " special bonding agent " to attempt to solve the damage problem that comes off of fluoroplastic lining, but needs band to press construction, more is not suitable for pipeline construction.
Chinese patent CN87102110A with mixing such as F46, phenolic resin and plumbagos, and reconciles into adhesives layer with ethanol, and surface layer is the mixture of F46 and plumbago, successively improves the ratio of F46, and it is anticorrosion successfully to be used for equipment surface.But this method is not suitable for pipeline construction equally.
Chinese patent CN2906277 (model utility), the pipeline and the pipe fitting that have the F46 undercoating and have the repaired mouth function, 0.1～50 micron of F46 undercoating thickness, PTFE joint are fixed in the pipe fitting port with protection F46 coating.But this method is not suitable for the coating construction of slender pipeline, and the combination force of coating and base material can not satisfy high vacuum and the requirement of the Ministry of worker more than 150 ℃.
Medium preparation and the friction behavior thereof of studying flame spraying F46 coating of the Feng Zhi of the Lanzhou Chemistry and Physics Institute of the Chinese Academy of Sciences; Lee Xiao Rong of Sichuan University, the Guan Congsheng of Shandong University, limit are clean, Li Guoli etc. has studied the F46/PPS composite corrosion proof coating, but all do not solve the pipeline corrosion protection construction problem.The F46 electrostatic spraying has been studied by rich Longhua construction equipment Co., Ltd of Nanjing Chinese-English chemical industry Co., Ltd, Zibo, the Zhangjagang City anticorrosion Science and Technology Ltd. of anti-spy of speeding; But electrostatic spraying is because spraying has for the first time formed insulation film; Can't multilayer spray, be not suitable for heavy anticorrosion construction.Also the someone adopts the F46 aqueous dispersion liquid to apply, and can only be coated onto below the 15 μ m, because after applying for the first time at every turn; The metal surface forms the very little F46 film of layer of surface tension force; Poor adhesive force when applying again, and be prone to crackle, also be not suitable for the heavy anticorrosion construction of pipeline.
Summary of the invention:
According to further investigation, the application inventor finds that the F46 micro mist has flow dispersion property preferably under certain dispersing agent effect; And band phenyl one type of silane coupling agent has heat-resisting quantity; Can obviously improve the adhesive strength in coating and base material, bottom and mesosphere, can carry out roller coating processing to slender pipeline, the F46 Composite steel-plastic pipe that obtains has excellent corrosion resistance, heat-resisting quantity, anti-negative pressure; Strong adhesion, thus the present invention accomplished.
The object of the present invention is to provide the preparation method of a kind of anti-corrosion pipeline (pipe fitting), relate to the method for F 46 roller coating on inner surface of metal pipe in particular, it is characterized in that may further comprise the steps: 1) metallic conduit is carried out pretreatment; 2) the subbing roller coating is being obtained bottom through pretreated metallic conduit internal surface and sintering, wherein, subbing is to be obtained by polyphenylene sulfide, F46 and silane coupler and dispersing agent blend; 3) with the intermediate layer coating roller coating in step 2) on the bottom of gained and sintering obtain the mesosphere, wherein, intermediate layer coating is made up of F46 and dispersing agent; 4) with the investment precoat roller coating on the mesosphere of step 3) gained and sinter molding obtain surface layer, make anti-corrosion pipeline, wherein, investment precoat is made up of F46 and dispersing agent.
Roll coating process of the present invention; Be meant and let metallic conduit (pipe fitting) rotate and certain inclination (5～30 °) is arranged; Coating evenly adds from high-end metering, and is blown into the hot blast (30～80 ℃ of hot blast temperatures can evaporate dispersing agent in the coating and get final product) of uniform temperature; The pipeline the other end is provided with suction hood, links to each other with dispersing agent reclaiming system (condensation, distilling apparatus) with suction, and dispersing agent can be recycled.
The pretreatment of metal base can be adopted common machine glazed finish facture or acid wash, and the surface roughness after the processing generally should not surpass 1/3 of coating thickness.
Coating is made up of bottom, mesosphere and surface layer, and total thickness gets final product at 200～300 microns.
Subbing is the dispersion liquid that is obtained by polyphenylene sulfide, F46 and silane coupler and dispersing agent blend, and the quality proportioning of polyphenylene sulfide, F46 and silane coupler is 50～95: 4.5～55: 0.1～5; Dispersing agent is 50～500%, preferred 200～300% of polyphenylene sulfide, F46 and a silane coupler three quality sum.
The used silane coupler of bottom is the high temperature resistant type silane coupler, preferred formula such as RC
6H
4(CH
2) nSi (OR ')
3The silane coupler of shown band phenyl, wherein: R is CH
3, ClCH
2, H (CH
2CH
2O) m, H (CH
2CH
2CH
2O) m, Cl (CH
2CH
2O) m, Cl (CH
2CH
2CH
2O) m; R ' is CH
3, C
2H
5M=0～5; N=0～5.
Select for use isopropanol and fluoroalkyl alcohol to do dispersing agent.Described fluoroalkyl alcohol can be selected to use separately or mix and use from trifluoroethanol, difluoroethanol, trifluoropropanol, tetrafluoropropanol, five fluorine propyl alcohol, hexafluoroisopropanol etc.; The ratio of the amount of substance of isopropanol and fluoroalkyl alcohol is 40～98: 60～2 in the said dispersing agent, preferred 70～98: 30～2.
The dispersion liquid that mesosphere and investment precoat are made up of F46 and dispersing agent, quality proportioning 15～75: 85～25, preferred 20～35: 80～65.
The sintering condition of coating of the present invention is: 325～365 ℃ of bottoms, insulation 5～15min; 315～350 ℃ in mesosphere, insulation 10～15min; 315～350 ℃ of surface layers, insulation 25～50min.Can carry out hardening after the insulation and handle, but also natural cooling.
Goods carry out the detection of adhesion and compactness as follows:
With reference to SY/T0442-1997 with not damaged electrical spark appearance, apply the voltage of 20V/ μ m, detecting coating has free of pinholes (leak source), to judge the compactness of coating.
2. designed the adhesive strength of cut high-pressure water jet method detection coating and base material and each interlayer voluntarily; Steel pipe after the rotational moulding is cut vertically; Coating is divided into the grid of 5 * 5mm with blade; Muzzle with high pressure water gun moves on to the position apart from coating 1m then, with the high pressure water of 5MPa coating is sprayed 30min, observes coating and has or not to be stripped from and come off or damage.
3. heating, vacuum test; Be connected with vacuum system applying good pipeline; Pipeline twines the fluoroplastic electric-heating belt outward and connects with power regulator, controls 150 ℃ of temperature, more than system vacuum table-0.098MPa, stops heating after 1 hour; The venting vacuum is watched pipeline coating and is had or not distortion, abnormal conditions such as peels off.
Embodiment:
Further describe characteristic of the present invention through instance below, but the present invention is not limited to following instance.
Sandblasting pretreatment is carried out with the carbon steel tube of Φ 45 * 3, long 2m in [embodiment 1].In the glass beaker that band stirs, add isopropanol 315g, trifluoroethanol 45g, stir 10min, it is subsequent use to obtain dispersing agent.Get about dispersing agent 100g, join in the there-necked flask, add phenyltrimethoxysila,e 1g again, stir 10min, obtain silane coupled agent dispersing liquid in the underlying material.In mixer (self-control), add F46 powder 4g, PPS powder 35g, mix 5min, add the silane coupled agent dispersing liquid that has prepared, mixing obtains subbing, takes out subsequent use; In mixer (self-control), add F46 powder 96g, add the dispersing agent 260g that has prepared, mixing obtains mesosphere (surface layer) coating, takes out subsequent use.Be metered into through flexible pipe 15 ° of inclination are arranged on the saddle that is arranged in the band rolling bearing, constantly rotation (rotating speed 20r/min) also has been preheating to 60 ℃ carbon steel tube, is blown into 55 ℃ hot blast simultaneously.Reinforced finishing, pipeline continues rotation, carbon steel tube is heated to 80 ℃ keeps 5min, pipeline is moved on in the sintering furnace again, by the speed of 10 ℃/min temperature is elevated to 340 ℃ of maintenance 10min; Be cooled to 60 ℃, pipeline is moved on to roller coating intermediate layer coating on the saddle (conditions such as temperature, rotating speed are with bottom roller coating condition), then pipeline is moved on in the sintering furnace, by the speed of 10 ℃/min temperature is elevated to 330 ℃ and keeps 15min, repeat 3 times; Be cooled to 60 ℃; Pipeline is moved on to roller coating investment precoat on the saddle (conditions such as temperature, rotating speed are with bottom roller coating condition), then pipeline is moved on in the sintering furnace, carbon steel tube is heated to 150 ℃ keeps 5min; Speed by 10 ℃/min is elevated to 330 ℃ of maintenance 45min with temperature again; At last pipeline is naturally cooled to room temperature, carry out the detection of adhesion and compactness, the result is as shown in table 1.
[embodiment 2] replace phenyltrimethoxysila,e with phenyl triethoxysilane, and other conditions are with embodiment 1.
[embodiment 3] replace phenyltrimethoxysila,e with the chloromethylbenzene ethyl triethoxysilane, and other conditions are with embodiment 1.
[embodiment 4] replace phenyltrimethoxysila,e with the polyether-modified polysiloxane of BD-3033H aryl, and other conditions are with embodiment 1.
[embodiment 5] replace phenyltrimethoxysila,e with BD-2051 aryl chain alkyl and polyethers comodified polysiloxane, and other conditions are with embodiment 1.
Add 10gPPS in [embodiment 6] intermediate layer coating, other conditions are with embodiment 1.
[embodiment 7] replace trifluoroethanol with tetrafluoropropanol 70g, and other conditions are with embodiment 1.
[embodiment 8] are dispersing agent with isopropanol 270g and trifluoroethanol 90g, and other conditions are with embodiment 1.
[comparative example 9] do not add silane coupler, and other conditions are with embodiment 1.
[comparative example 10] replaces phenyltrimethoxysila,e with KH-550, and other conditions are with embodiment 1.
[comparative example 11] replaces dispersing agent with ethanol, and other conditions are with embodiment 1.
[comparative example 12] is dispersing agent with isopropanol 100g and trifluoroethanol 300g, and other conditions are with embodiment 1.
[comparative example 13] do not add silane coupler and dispersing agent, by interior and table PPS ratio gradually fall, the F46 ratio is cumulative, dry powder rotational moulding, 300～360 ℃ of tube wall temperature controls.
Each embodiment's test result is seen table 1.
Each embodiment's test result of table 1 gathers
| Embodiment | Forming process | Spark test | The high pressure water test | The heating, vacuum test |
| Embodiment 1 | Moulding is normal | No abnormal | No abnormal | No abnormal |
| Embodiment 2 | Moulding is normal | No abnormal | No abnormal | No abnormal |
| Embodiment 3 | Moulding is normal | No abnormal | No abnormal | No abnormal |
| Embodiment 4 | Moulding is normal | No abnormal | No abnormal | No abnormal |
| Embodiment 5 | Moulding is normal | No abnormal | No abnormal | No abnormal |
| Embodiment 6 | Moulding is normal | No abnormal | No abnormal | No abnormal |
| Embodiment 7 | Moulding is normal | No abnormal | No abnormal | No abnormal |
| Embodiment 8 | Moulding is normal | No abnormal | No abnormal | No abnormal |
| Comparative example 9 | Moulding is normal | No abnormal | Part is peeled off | Distortion |
| Comparative example 10 | Plastic | Defective | Peel off | Bloat |
| Comparative example 11 | Plastic | No abnormal | Part is peeled off | Distortion |
| Comparative example 12 | Moulding is bad | ? | ? | ? |
| Comparative example 13 | Difficult forming | - | ?- | ?- |
Claims (8)
1. the method for a F 46 roller coating on inner surface of metal pipe is characterized in that may further comprise the steps: 1) metallic conduit is carried out pretreatment;
2) the subbing roller coating is being obtained bottom through pretreated metallic conduit internal surface and sintering, wherein, subbing is to be obtained by polyphenylene sulfide, F46 and silane coupler and dispersing agent blend;
3) with the intermediate layer coating roller coating in step 2) on the bottom of gained and sintering obtain the mesosphere, wherein, intermediate layer coating is made up of F46 and dispersing agent;
4) with the investment precoat roller coating on the mesosphere of step 3) gained and sinter molding obtain surface layer, make anti-corrosion pipeline, wherein, investment precoat is made up of F46 and dispersing agent.
2. the method for a kind of F 46 roller coating on inner surface of metal pipe according to claim 1 is characterized in that step 2) the used silane coupler general formula of described subbing is RC
6H
4(CH
2) nSi (OR ')
3The silane coupler of shown band phenyl, wherein: R is CH
3, ClCH
2, H (CH
2CH
2O) m, H (CH
2CH
2CH
2O) m, Cl (CH
2CH
2O) m, Cl (CH
2CH
2CH
2O) m; R ' is CH
3, C
2H
5M=0～5; N=0～5.
3. the method for a kind of F 46 roller coating on inner surface of metal pipe according to claim 1; It is characterized in that step 2)～4) described in dispersing agent select isopropanol and fluoroalkyl alcohol for use; Fluoroalkyl alcohol can be selected to use separately or mix and use from trifluoroethanol, difluoroethanol, trifluoropropanol, tetrafluoropropanol, five fluorine propyl alcohol, hexafluoroisopropanol, and the ratio of the amount of substance of isopropanol and fluoroalkyl alcohol is 40～98: 60～2.
4. the method for a kind of F 46 roller coating on inner surface of metal pipe according to claim 3 is characterized in that the ratio of the amount of substance of isopropanol and fluoroalkyl alcohol in the said dispersing agent is 70～98: 30～2.
5. the method for a kind of F 46 roller coating on inner surface of metal pipe according to claim 1 is characterized in that step 2) the quality proportioning of polyphenylene sulfide, F46 and silane coupler is 50～95: 4.5～55 in the described subbing: 0.1～5; Dispersing agent is 50～500% of polyphenylene sulfide, F46 and a silane coupler three quality sum.
6. the method for a kind of F 46 roller coating on inner surface of metal pipe according to claim 5 is characterized in that dispersing agent is 200～300% of polyphenylene sulfide, F46 and a silane coupler three quality sum.
7. the method for a kind of F 46 roller coating on inner surface of metal pipe according to claim 1 is characterized in that step 3) and 4) F46 and dispersing agent quality proportioning are 15～75: 85～25 in described mesosphere and the investment precoat.
8. the method for a kind of F 46 roller coating on inner surface of metal pipe according to claim 7 is characterized in that the quality proportioning of F46 and dispersing agent is 20～35: 80～65 in described mesosphere and the investment precoat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102168504A CN101769409B (en) | 2009-12-31 | 2009-12-31 | Method for F46 roller coating on inner surface of metal pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102168504A CN101769409B (en) | 2009-12-31 | 2009-12-31 | Method for F46 roller coating on inner surface of metal pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101769409A CN101769409A (en) | 2010-07-07 |
| CN101769409B true CN101769409B (en) | 2012-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102168504A Expired - Fee Related CN101769409B (en) | 2009-12-31 | 2009-12-31 | Method for F46 roller coating on inner surface of metal pipe |
Country Status (1)
| Country | Link |
|---|---|
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103642373B (en) * | 2013-11-21 | 2016-01-20 | 中国石油化工股份有限公司 | A kind of corrosion-resistant crude oil pipeline coated material and coating process thereof |
| CN107652793B (en) * | 2017-09-28 | 2021-01-19 | 常州百思通复合材料有限公司 | Exhaust or exhaust smoke exhaust pipeline for clean room and manufacturing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5536583A (en) * | 1986-07-01 | 1996-07-16 | Edlon Products, Inc. | Polymer metal bonded composite and method of producing same |
| CN1077589C (en) * | 1997-01-19 | 2002-01-09 | 田育甫 | Spraying method for fluoroplastic and fluoroplastic alloy corrosionproof coating |
| CN1346860A (en) * | 2001-10-30 | 2002-05-01 | 华东理工大学 | Anticorrosion composite nano paint and its preparing process |
| CN101153195B (en) * | 2007-10-19 | 2010-08-25 | 宋广山 | Anticorrosion paint special for polyphenylene sulfide and method of producing polyphenylene sulfide compound steel tube |
-
2009
- 2009-12-31 CN CN2009102168504A patent/CN101769409B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5536583A (en) * | 1986-07-01 | 1996-07-16 | Edlon Products, Inc. | Polymer metal bonded composite and method of producing same |
| CN1077589C (en) * | 1997-01-19 | 2002-01-09 | 田育甫 | Spraying method for fluoroplastic and fluoroplastic alloy corrosionproof coating |
| CN1346860A (en) * | 2001-10-30 | 2002-05-01 | 华东理工大学 | Anticorrosion composite nano paint and its preparing process |
| CN101153195B (en) * | 2007-10-19 | 2010-08-25 | 宋广山 | Anticorrosion paint special for polyphenylene sulfide and method of producing polyphenylene sulfide compound steel tube |
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| CN101769409A (en) | 2010-07-07 |
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