CN102297319B - Anti-corrosive inner lining with composite coating and application thereof - Google Patents
Anti-corrosive inner lining with composite coating and application thereof Download PDFInfo
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- CN102297319B CN102297319B CN 201110224584 CN201110224584A CN102297319B CN 102297319 B CN102297319 B CN 102297319B CN 201110224584 CN201110224584 CN 201110224584 CN 201110224584 A CN201110224584 A CN 201110224584A CN 102297319 B CN102297319 B CN 102297319B
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Abstract
The invention relates to an anti-corrosive inner lining with a composite coating and application thereof. The anti-corrosive inner lining comprises a cement mortar inside lining layer and the composite coating, wherein the composite coating is formed by the following structures: an ultra-low viscosity epoxy paint layer coated on the cement mortar inside lining layer and a common epoxy paint layer coated on the ultra-low viscosity epoxy paint layer, wherein the paint-4 cup viscosity of an ultra-low viscosity epoxy paint of the ultra-low viscosity epoxy paint layer is less than or equal to 60 sat the temperature of 25 DEG C; the thickness of the ultra-low viscosity epoxy paint layer is 10-60 mu m; the kinetic viscosity of both A ingredient and B ingredient in a common epoxy paint of the common epoxy paint layer is 100-10000 mPa.S at the temperature of 25 DEG C and the kinetic viscosity decreases with the increasing of temperature; and the thickness of the composite coating is 100-350 mu m. The anti-corrosive inner lining with the composite coating can inhibit the separation of alkaline substances and injurious ingredient from cement mortar; and the anti-corrosive inner lining can stand the change of increasing and decreasing of water pressure in a process of conveying water, and the anti-corrosive inner lining is not damaged.
Description
Technical field
The present invention relates to a kind of application of anticorrosive coating.
Background technique
The corrosion-proof lining that is used for cast iron tube at present generally has two kinds, and a kind of is general slush liner, and another kind is the organic coating corrosion-proof lining.
The slush liner has good antiseptic property to ductile iron pipe; Belong to Active Anticorrosion, but because its intrinsic basic character makes it at pipeline; Especially the water delivery initial stage of small-bore pipeline causes that the pH value of water quality raises, the rising of aluminium composition, influences the sanitation performance of water quality.Organic coating corrosion-proof lining (for example epoxy, polyurethane liner) is though solved this problem; But will be at the such liner of cast iron tube inner-wall spraying one deck; Its thickness is necessary >=and 500 μ m just can reach certain antiseptic effect; Thereby make to cost an arm and a leg that so anticorrosion mode belongs to passive anticorrosion.For example, Chinese patent CN1250856A discloses a kind of nodular cast iron tube with liner of non-calcine ceramic and method for making thereof, and its coating is made up of epoxy resin etc., is painted on ductile iron pipe inner wall, thick coating 1-2 millimeter.Obviously, such thickness must need to improve cost of production, in case such coating has a bit damaged or holiday, such point can bring fatal disaster to pipeline simultaneously, in these weak link corrosion aggravations, causes corrosion failure.
The flat 3-14988 of Japan Patent JP then discloses a kind of cast iron tube corrosion-proof lining; Rely on the centrifugal action lining to be coated with one deck slush liner 2 at the inwall of cast iron tube 1, and then on cement sand bed 2, insert the circular inner liner film that one deck forms by PVC, polyethylene, polystyrene and the internal lining pipe that forms with anti-current body corrosive action.This patented technology is directly the resin film of a circle to be inserted into the top layer of cast iron pipe cement mortar, and utilizes in shape coupling to prevent it and peel off.Though it utilizes the mode of laminated coating; But; The abrasion resistance of used here polyethylene kind material itself can be bad, and be not easy to be attached on the striaght cement mortar, generally need in the slush liner, add organic substance and strengthen its adhesion; And then making whole production technology become more complicated, cost is also high more.
It is thus clear that; Select a kind of Active Anticorrosion with passive anticorrosion combine have an excellent antiseptic property; And the higher novel lining of cost performance is the key in the cast iron tube research, further, because in the water delivery process, inevitably can run into the up-down of pressure and shut down the process that maintenance is boosted again; So whether qualified the pressures cycle performance be to characterize cast iron tube and pipe fitting important indicator; And can this index qualifiedly have direct relation with coating thickness, but the thickness increase must cause the increase of cost of production, so the restriction of thickness is the difficult point in this type pipe and the pipe fitting research.
Summary of the invention
The object of the present invention is to provide a kind of corrosion-proof lining and a kind of cast iron tube and pipe fitting that contains composite coating with this corrosion-proof lining.This corrosion-proof lining has the following advantages: can suppress the separating out of alkali matter and harmful components in the slush, guarantee the sanitation performance of water quality; Can the moisture content in the slush be sealed, promote the hydration reaction of slush, be beneficial to health, stop the generation of crackle; While composite coating and slush interliner; The Active Anticorrosion of slush liner and the passive antiseptic property of organic coating have been had concurrently; Even composite coating has breakage and holiday, the slush liner will provide Active Anticorrosion so, has guaranteed the long-term anti-corrosive properties of pipeline; The cast iron tube inner wall smooth that contains corrosion-proof lining can reduce the roughness coefficien of slush liner, compares cement lining and has the effect that improves hydraulic performance; The up-down that this corrosion-proof lining can stand hydraulic pressure in the water delivery process changes, and corrosion-proof lining is without prejudice; In addition, this corrosion-proof lining overall cost is more much lower than organic coating corrosion-proof lining, can reduce the overall cost of pipeline effectively.
A kind of corrosion-proof lining that contains composite coating comprises: slush inside liner and composite coating, and wherein composite coating is made up of following structure:
The ultra-low viscosity epoxy paint layer that on the slush inside liner, applies,
The common epoxy paint layer that applies on the ultra-low viscosity epoxy paint layer;
Be coated with-4 glass viscosity of the ultra-low viscosity epoxy coating of ultra-low viscosity epoxy paint layer in the time of 25 ℃ are≤60s that the thickness of ultra-low viscosity epoxy paint layer is 10-60 μ m; In the common epoxy coating of common epoxy paint layer, A component and the B component kinetic viscosity in the time of 25 ℃ is 100mPas～10000mpas, and can reduce with the rising kinetic viscosity of temperature; The thickness of composite coating is 100-350 μ m.
The ultra-low viscosity epoxy paint layer is as the seal coat layer in the composite coating among the present invention, and common epoxy paint layer is as the sealing coat in the composite coating.
The ultra-low viscosity epoxy coating of ultra-low viscosity epoxy paint layer can be selected from: solventless epoxy coating or solvent-borne type epoxy coating or solventless epoxy coating of crossing with solvent dilution or the solvent-borne type epoxy coating of crossing with solvent dilution; The common epoxy coating of common epoxy paint layer can be selected from: solventless epoxy coating or solvent-borne type epoxy coating.
The ultra-low viscosity epoxy coating can be selected from following coating:
Solventless epoxy coating can be selected from: the Devoe D167 of ICI company; The Devoe 168LTC of ICI company;
The solvent-borne type epoxy coating can be selected from: GH 606 priming paint of the anticorrosion company of eastization; The high infiltration of UniTile Sealer LV epoxy seal coat.
The solventless epoxy coating of crossing with solvent dilution or can be selected from: can adopt xylol or n-butanol or the mixture of the two that the GH 302 non-solvent epoxy titanium white coating and the HEMPEL85671 of the anticorrosion company of eastization are diluted with the solvent-borne type epoxy coating that solvent dilution is crossed.
Common epoxy coating can be selected from following coating, and the A component of following coating and the B component kinetic viscosity in the time of 25 ℃ is 100mPas～10000mpas, and can reduce with the rising kinetic viscosity of temperature:
Solventless epoxy coating: HEMPEL 35530, excellent imperial BE14, the GH102 colour circle oxygen ceramic coating of the anticorrosion company of eastization or GH 302 non-solvent epoxy titanium white coating;
Solvent-borne type epoxy coating: HEMPEL 85671, the precious multi-functional paint D233H of Devoe oil of ICI company.
The present invention contains the corrosion-proof lining of composite coating, and-4 glasss of viscosity that are coated with of wherein said ultra-low viscosity epoxy coating are≤40s.
The present invention contains the corrosion-proof lining of composite coating, and the thickness of wherein said ultra-low viscosity epoxy paint layer is 10-40 μ m.
The present invention contains the corrosion-proof lining of composite coating, and the thickness of wherein said composite coating is 100-250 μ m.
The present invention contains the corrosion-proof lining of composite coating, and the slush of wherein said slush inside liner is made up of the following component by mass parts:
100 parts of Portland cement or sulfate-resistant cement or alumina cements,
River sand 120-180 part,
Water 30-70 part,
Water reducing agent 0-1.5 part.
Water reducing agent is optional from the polycarboxylic acids series high-performance dehydragent.
The present invention contains the corrosion-proof lining of composite coating, and the thickness of wherein said slush inside liner is 3-15mm, and preferred thickness is at 3-13mm.The right thickness of slush inside liner changes according to the difference of caliber to some extent; For the cast iron tube inwall; Minimum value is that 1.5 millimeters slush liner is enough to guarantee that cast iron tube is anticorrosive, yet cast iron tube inwall in the process of casting has the cast iron slag blanket, and caliber is big more; Slag blanket is thick more, and the thickness of slush liner is crossed thin can the covering and do not lived the cast iron slag blanket; Certainly the slush liner is blocked up, can cause the waste of raw material, not only can cause the difficulty that reduces but also can cause epoxy coating to apply of internal diameter.Said slush liner according to the resulting pull strength of ASTM D4541 standard at 2-10MPa.
A kind of cast iron tube, by cast iron tube and on the cast iron tube inwall lining corrosion-proof lining that contains composite coating that be coated with, one of above-mentioned form.
The present invention has the cast iron tube of corrosion-proof lining, and the cast iron materials of wherein said cast iron tube is a spheroidal graphite cast iron.
A kind of cast iron pipe fittings, that lining is coated with by cast iron pipe fittings with on the cast iron pipe fittings inwall, one of the above-mentioned corrosion-proof lining that contains compound special layer is formed.
The present invention has the cast iron pipe fittings of corrosion-proof lining, and the cast iron materials of wherein said cast iron pipe fittings is a spheroidal graphite cast iron.
Among the present invention, ultra-low viscosity epoxy coating method for detecting viscosity: detect according to the GB/T1723 standard, adopt to be coated with-4 flow cups; The method for detecting viscosity of A component and B component in the common epoxy coating: detect according to GB/T 9751 standards.Adopt the NDJ-1 rotational viscosimeter.
The concrete preparation process of cast iron tube of the present invention or cast iron pipe fittings is following:
(1) lining of slush is coated with
This step is an existing technology; For cast iron tube (cast iron straight pipe); On centrifuge, rotate on one side through cast iron tube, Yi Bian adopt the mode of screw feeder or pumping that the slush mix is placed the cast iron tube inwall, and make it on ductile iron pipe is axial, to be evenly distributed; Make the cast iron tube high speed rotating then, rely on centrifugal action that the slush liner is evenly distributed and form the slush inside liner; Such mode can make the slush liner closely paste mutually with the cast iron tube wall, increases the adhesion between slush liner and the cast iron tube wall, reduces defectives such as hollowing.
This step is an existing technology; For cast iron pipe fittings (special pipe); The slush liner then adopts spraying or manual smearing; Spraying is that slush is sprayed to pipe internal surface through the high speed rotating shower nozzle, perhaps through pressurized air slush is sprayed to pipe internal surface with the mortar spray gun, forms certain thickness slush inside liner.
(2) health of slush liner
The slush liner adopts the mode of steam curing that the slush inside liner is carried out health; Health temperature is 40 ℃-80 ℃; Humidity is more than 90%; Conditioned time is between the 7h-12h, and such health mode can make slush liner intensity at short notice reach 28 days natural Health preservation intensity more than 70%;
(3) surface treatment of slush liner
After the health of slush inside liner, grind the mode that adds sandblast in adopting the slush liner surface is handled, remove dirts such as surperficial laitance; Adopt high-pressure blast to blow away the dirts such as dust of slush inside liner;
(4) slush liner moisture content requirement
Carry out after the surface treatment, adopt method or other method of heating to remove slush liner redundant moisture.Detecting method is pressed the humidity of described plastic pellicle method of testing detection slush liner in the ASTM D-4263, gets 45cm X45cm * 10m cellothene and lies in concrete surface, seals four limits with tape paper.If occur the globule or concrete surface blackening behind the 16h under the film, explain that then concrete is wet excessively, unsuitable application.The slush liner that general centrifugation is produced, through behind the steam curing, 35～45 ℃ of baking 30min can reach requirement in oven.
(5) coating of epoxy coating
Adopt the mode of airless spraying or roller coating that the ultra-low viscosity epoxy coating is coated on the slush liner; Dry 2h～8h under this layer normal temperature is formed seal coat, adopt the mode of two component airless sprayings that common epoxy coating is sprayed on this seal coat then.
The present invention has the cast iron tube of corrosion-proof lining or pipe fitting has the following advantages and good effect:
1. this corrosion-proof lining has combined Active Anticorrosion and passive corrosion-resistant combination property; Be that the enforcement of composite coating reduces or completely cut off the touch opportunity with water and slush liner, this be passive anticorrosion, also slows down or stoped the chance of the outside release of alkali matter in the slush liner simultaneously; This has also just guaranteed the inwall that is enriched in ductile iron pipe that the alkali matter of slush can be permanent; Can make the passivation of iron pipe inwall, this is an Active Anticorrosion, has guaranteed permanent anti-corrosive properties.
2, this corrosion-proof lining is because the enforcement of composite coating, reduces or completely cut off the chance that slush liner alkali matter discharges in water, thereby guaranteed the quality of water quality.
3, it is nontoxic that composite coating solidifies the back.Therefore, can be used as the drinking water pipeline corrosion-proof lining fully, can not pollute, can not produce harmful material water quality.Said cast iron tube or pipe fitting, separating out with inhibition slush liner alkali matter is main purpose, mainly proves through following performance:
1) dynamic long term seal performance
Dynamically the long term seal performance detection is with said cast iron tube or pipe fitting, and using water velocity is that 8 water cycle was washed away sealing coat at least 3 months as 1.8-3.5m/s, pH value, and continuous supercharging, decompression, and the pH value of detection circulating water is 8＜pH≤9.5.
2) static long term seal performance
With the pH value of preparation is that 8 water is full of in whole corrosion-proof lining cast iron tube or the pipe fitting, soaks after 2 months the pH value variation≤0.5 of detection soaked in water.
4, the composite coating smooth surface has reduced surface friction drag, has strengthened water velocity, has saved conveying capacity.
5, above-mentioned cast iron tube or pipe fitting have in hydraulic pressure circulation environment inside liner and do not peel off not damaged performance.
Embodiment
Below in conjunction with specific embodiment the present invention is described further:
Cast iron tube of the present invention or cast iron pipe material by adopting DN100 ductile iron pipe, concrete preparation process is following:
(1) lining of slush is coated with
This step is an existing technology; For cast iron tube (cast iron straight pipe); On centrifuge, rotate on one side through cast iron tube, Yi Bian adopt the mode of screw feeder or pumping that the slush mix is placed the cast iron tube inwall, and make it on ductile iron pipe is axial, to be evenly distributed; Make the cast iron tube high speed rotating then, rely on centrifugal action that the slush liner is evenly distributed and form the slush inside liner; Such mode can make the slush liner closely paste mutually with the cast iron tube wall, increases the adhesion between slush liner and the cast iron tube wall, reduces defectives such as hollowing.
This step is an existing technology; For cast iron pipe fittings (special pipe); The slush liner then adopts spraying or manual smearing; Spraying is that slush is sprayed to pipe internal surface through the high speed rotating shower nozzle, perhaps through pressurized air slush is sprayed to pipe internal surface with the mortar spray gun, forms certain thickness slush inside liner.
(2) health of slush liner
The slush liner adopts the mode of steam curing that the slush inside liner is carried out health, and health temperature is 70 ℃, and humidity is more than 90%, and conditioned time is 10h;
(3) surface treatment of slush liner
After the health of slush inside liner, grind the mode that adds sandblast in adopting the slush liner surface is handled, remove dirts such as surperficial laitance; Adopt high-pressure blast to blow away the dirts such as dust of slush inside liner;
(4) slush liner moisture content requirement
After carrying out surface treatment, adopt method or other method of heating to remove slush liner redundant moisture.Detecting method is pressed the humidity of described plastic pellicle method of testing detection slush liner in the ASTM D-4263, gets 45cm X45cm * 10m cellothene and lies in concrete surface, seals four limits with tape paper.If occur the globule or concrete surface blackening behind the 16h under the film, explain that then concrete is wet excessively, unsuitable application.The slush liner that general centrifugation is produced, through behind the steam curing, 35～45 ℃ of baking 30min can reach requirement in oven.
(5) coating of epoxy coating
Adopt the mode of airless spraying or roller coating that the ultra-low viscosity epoxy coating is coated on the slush liner,, adopt the mode of two component airless sprayings that common epoxy coating is sprayed on this seal coat then dry 5h under this layer normal temperature.
Adopt said method respectively according to the listed component of table 1-table 3, obtain to have the cast iron tube or the pipe fitting of corrosion-proof lining:
Table 1 slush inside liner
Table 2 is composition, viscosity and the thickness of composite coating, on the slush liner, applies the ultra-low viscosity epoxy coating earlier as seal coat, applies common epoxy coating then above that as sealing coat, thereby forms composite coating.
The composition of table 2 composite coating, viscosity and thickness
Wherein, the HEMPEL 85671 that adds 10% thinner is meant that the quality that adds thinner is 10% of HEMPEL 85671 quality, and thinner is that volume ratio is 7: 3 a xylol: n-butanol.
Through the detection that the different-thickness composite coating The apparent phenomenon of slush liner, soaked in water pH value are changed, hydraulic pressure loop around test result's investigation; Short-term sealability, the dynamically investigation of long term seal results of property; Confirm the scope of sealing coat thickness, measure the result referring to table 3.
The composition of table 3 corrosion-proof lining and performance test result
(annotating 1)
Test method: slush liner composite coating The apparent phenomenon, range estimation is confirmed:
Evaluating method:
Zero---presentation surface is smooth;
---presentation surface is smooth;
△---expression can cover the slush liner;
(annotating 2) static long term seal performance:
Test method: with the pH value of preparation is that 8 water is full of in the cast iron tube, soaks through after 2 months, detects the pH value variation of soaked in water.
Evaluating method: zero---amount≤0.5 that water pH value increases in the pipe;
---amount >=0.5 that water pH value increases in the pipe;
(annotating 3) be the long term seal performance dynamically:
Test method: with the cast iron tube of corrosion-proof lining, using flow velocity is that 8 water cycle was washed away sealing coat 3 months as 1.8-3.5m/s, pH value, and constantly supercharging, decompression, detects the pH value of circulating water.
Evaluating method:
Zero---after 3 months, the pH value of circulating water is 8＜pH≤8.5 in the pipe, and sealing coat is intact
---after 3 months, the pH value of circulating water is 8.5＜pH≤9.5 in the pipe, and sealing coat is intact;
*---after 3 months, water pH value pH in the pipe＞9.5, or sealing coat bubbles, obscission.
(annotating 4) hydraulic pressure circulation environment:
Test method
1) with corrosion-proof lining cast iron tube and pipe fitting thereof, sealed at both ends, setting pressure table and relevant water injection equipment;
2) water filling in pipe boosts to pressure 16-25bar, and pressurize 2h;
3) pressure release to 0 pressure then, pressurize two hours;
4) by 1) and 2) a pressures cycle process formed;
5) carry out 25 circulations altogether.
Evaluating method: the state that bubbles, comes off range estimation is confirmed, confirms the adhesion situation through the complexity of scraping with blade.
Can find out that from table 3 thickness all has inhibitory action to slush liner alkalescence between 100 μ m～350 μ m; Especially thickness can bear up to the loop around test of 25bar hydraulic pressure between 100 μ m～250 μ m, and the problem that this sealing coat does not bubble basically, comes off, adhesion descends.
Above-described embodiment describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the prerequisite of spirit not breaking away from the present invention; Various distortion and improvement that those of ordinary skills make technological scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (19)
1. corrosion-proof lining that contains composite coating is characterized in that comprising: slush inside liner and composite coating, and wherein composite coating is made up of following structure:
The ultra-low viscosity epoxy paint layer that on the slush inside liner, applies,
The common epoxy paint layer that applies on the ultra-low viscosity epoxy paint layer;
Be coated with-4 glass viscosity of the ultra-low viscosity epoxy coating of ultra-low viscosity epoxy paint layer in the time of 25 ℃ are≤60s that the thickness of ultra-low viscosity epoxy paint layer is 10-60 μ m; In the common epoxy coating of common epoxy paint layer, A component and the B component kinetic viscosity in the time of 25 ℃ is 100mPas ~ 10000mpas, and can reduce with the rising kinetic viscosity of temperature; The thickness of composite coating is 100-350 μ m.
2. the corrosion-proof lining that contains composite coating according to claim 1 is characterized in that :-4 glasss of viscosity that are coated with of said ultra-low viscosity epoxy coating are≤40s.
3. the corrosion-proof lining that contains composite coating according to claim 1 and 2 is characterized in that: the thickness of said ultra-low viscosity epoxy paint layer is 10-40 μ m.
4. the corrosion-proof lining that contains composite coating according to claim 1 and 2 is characterized in that: the thickness of said composite coating is 100-250 μ m.
5. the corrosion-proof lining that contains composite coating according to claim 3 is characterized in that: the thickness of said composite coating is 100-250 μ m.
6. the corrosion-proof lining that contains composite coating according to claim 4 is characterized in that: the slush of said slush inside liner is made up of the following component by mass parts:
100 parts of Portland cement or sulfate-resistant cement or alumina cements,
River sand 120-180 part,
Water 30-70 part,
Water reducing agent 0-1.5 part.
7. the corrosion-proof lining that contains composite coating according to claim 5 is characterized in that: the slush of said slush inside liner is made up of the following component by mass parts:
100 parts of Portland cement or sulfate-resistant cement or alumina cements,
River sand 120-180 part,
Water 30-70 part,
Water reducing agent 0-1.5 part.
8. the corrosion-proof lining that contains composite coating according to claim 1 is characterized in that: the thickness of said slush inside liner is 3-15mm.
9. the corrosion-proof lining that contains composite coating according to claim 8 is characterized in that: the thickness of said slush inside liner is 3-13mm.
10. cast iron tube is characterized in that: lining is coated with by cast iron tube with on the cast iron tube inwall, form like claim 1,2,5,6,7, the 8 or 9 said corrosion-proof linings that contain composite coating.
11. a cast iron tube is characterized in that: by cast iron tube and on the cast iron tube inwall lining be coated with, form like the said corrosion-proof lining that contains composite coating of claim 3.
12. a cast iron tube is characterized in that: by cast iron tube and on the cast iron tube inwall lining be coated with, form like the said corrosion-proof lining that contains composite coating of claim 4.
13. cast iron tube according to claim 10 is characterized in that: the cast iron materials of said cast iron tube is a spheroidal graphite cast iron.
14. according to claim 11 or 12 described cast iron tubes, it is characterized in that: the cast iron materials of said cast iron tube is a spheroidal graphite cast iron.
15. a cast iron pipe fittings is characterized in that: by cast iron pipe fittings and on the cast iron pipe fittings inwall lining be coated with, form like claim 1,2,5,6,7, the 8 or 9 said corrosion-proof linings that contain composite coating.
16. a cast iron pipe fittings is characterized in that: by cast iron pipe fittings and on the cast iron pipe fittings inwall lining be coated with, form like the said corrosion-proof lining that contains composite coating of claim 3.
17. a cast iron pipe fittings is characterized in that: by cast iron pipe fittings and on the cast iron pipe fittings inwall lining be coated with, form like the said corrosion-proof lining that contains composite coating of claim 4.
18. the cast iron pipe fittings with corrosion-proof lining according to claim 15 is characterized in that: the cast iron materials of cast iron pipe fittings is a spheroidal graphite cast iron.
19. according to claim 16 or 17 described cast iron pipe fittingss with corrosion-proof lining, it is characterized in that: the cast iron materials of cast iron pipe fittings is a spheroidal graphite cast iron.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110224584 CN102297319B (en) | 2011-08-05 | 2011-08-05 | Anti-corrosive inner lining with composite coating and application thereof |
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| CN 201110224584 CN102297319B (en) | 2011-08-05 | 2011-08-05 | Anti-corrosive inner lining with composite coating and application thereof |
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| CN102297319B true CN102297319B (en) | 2012-12-05 |
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| WO2018210212A1 (en) * | 2017-05-16 | 2018-11-22 | 新兴河北工程技术有限公司 | Ductile iron pipe having anti-corrosion inner coating, and production process therefor |
| CN107214064A (en) * | 2017-07-28 | 2017-09-29 | 芜湖新兴铸管有限责任公司 | A kind of anticorrosion process of nodular cast iron pipe fittings liner |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2438902Y (en) * | 1999-11-09 | 2001-07-11 | 新兴铸管股份有限公司 | Baking-free ceramic lining nodular cast iron tube |
| CN1601169A (en) * | 2003-09-24 | 2005-03-30 | 中国石油天然气股份有限公司 | Composite external anticorrosive layer for pipeline overhaul |
| CN201106735Y (en) * | 2007-12-04 | 2008-08-27 | 中国石油天然气集团公司 | Trilaminate polythene antisepsis pipe of solvent-free epoxy-paint patching mouth |
-
2011
- 2011-08-05 CN CN 201110224584 patent/CN102297319B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2438902Y (en) * | 1999-11-09 | 2001-07-11 | 新兴铸管股份有限公司 | Baking-free ceramic lining nodular cast iron tube |
| CN1601169A (en) * | 2003-09-24 | 2005-03-30 | 中国石油天然气股份有限公司 | Composite external anticorrosive layer for pipeline overhaul |
| CN201106735Y (en) * | 2007-12-04 | 2008-08-27 | 中国石油天然气集团公司 | Trilaminate polythene antisepsis pipe of solvent-free epoxy-paint patching mouth |
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