CN102297318B - Compound antisepsis inner lining containing low-viscosity epoxy coating sealing layer and application thereof - Google Patents
Compound antisepsis inner lining containing low-viscosity epoxy coating sealing layer and application thereof Download PDFInfo
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- CN102297318B CN102297318B CN 201110224559 CN201110224559A CN102297318B CN 102297318 B CN102297318 B CN 102297318B CN 201110224559 CN201110224559 CN 201110224559 CN 201110224559 A CN201110224559 A CN 201110224559A CN 102297318 B CN102297318 B CN 102297318B
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Abstract
The invention relates to a compound antisepsis inner lining containing a low-viscosity epoxy coating sealing layer and an application thereof, and the inner lining provided by the invention comprises a cement plaster inner lining layer and the low-viscosity epoxy coating layer coated on the cement plaster inner lining layer, wherein the viscosity of the epoxy coating of the low-viscosity epoxy coating layer when being used for coating 4 cups at 25 DEG C is no more than 120s, the thickness of the low-viscosity epoxy coating layer is 10 mu m-100 mu m. The compound antisepsis inner lining provided by the invention has the advantages that the precipitation of the alkaline matter and harmful ingredient in the cement plaster can be restrained, and the epoxy coating layer can seal the moisture in the cement plaster so as to avoid the generation of cracks; and the rugosity coefficient of the cement plaster inner lining is reduced, the compound antisepsis inner lining can bear the fluctuation variation of the water pressure in a water delivery process, thereby preventing the antisepsis inner lining from being damaged.
Description
Technical field
The present invention relates to a kind of application of low viscosity epoxy 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 composite corrosion-resistant lining and a kind of cast iron tube and pipe fitting that contains low viscosity epoxy coating sealing coat with this composite corrosion-resistant lining.This composite corrosion-resistant 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; Epoxy paint layer can seal the moisture content in the slush, promotes the hydration reaction of slush, is beneficial to health, stops the generation of crackle; While epoxy paint layer and slush interliner; The Active Anticorrosion of slush liner and the passive antiseptic property of organic coating have been had concurrently; Even epoxy paint layer 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 composite corrosion-resistant 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 composite corrosion-resistant lining can stand hydraulic pressure in the water delivery process changes, and corrosion-proof lining is without prejudice; In addition, this composite corrosion-resistant lining overall cost is more much lower than organic coating corrosion-proof lining, can reduce the overall cost of pipeline effectively.
A kind of composite corrosion-resistant lining that contains low viscosity epoxy coating sealing coat; The low viscosity epoxy coating layer that comprises the slush inside liner and on the slush inside liner, apply; Wherein the low viscosity epoxy coating layer is as sealing coat; Be coated with-4 glass viscosity of the low viscosity epoxy coating of low viscosity epoxy coating layer in the time of 25 ℃ are≤120s that the thickness of low viscosity epoxy coating layer is 10-100 μ m.
Low viscosity epoxy coating 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.
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: HEMPEL85671, the GH606 priming paint of the anticorrosion company of eastization.
The epoxy coating of crossing with solvent dilution can be selected from: can adopt the T-5 thinner of ICI company that D233H is diluted; Can adopt xylol or n-butanol or the mixture of the two that the GH302 non-solvent epoxy titanium white coating and the HEMPEL85671 of the anticorrosion company of eastization are diluted.
The present invention contains the composite corrosion-resistant lining of low viscosity epoxy coating sealing coat, and be coated with-4 glass viscosity of the epoxy coating of wherein said low viscosity epoxy coating layer in the time of 25 ℃ are≤100s.
The present invention contains the composite corrosion-resistant lining of low viscosity epoxy coating sealing coat, and the thickness of wherein said low viscosity epoxy coating layer is 10-80 μ m.
The present invention contains the composite corrosion-resistant lining of low viscosity epoxy coating sealing coat, and the slush composition of wherein said slush inside liner is counted by mass parts:
Portland cement or sulfate-resistant cement or alumina cement: 100 parts,
River sand: 120-180 part,
Water: 30-70 part,
Water reducing agent: 0-1.5 part.
Water reducing agent can be selected from: polycarboxylate high performance water-reducing agent.
The present invention contains the composite corrosion-resistant lining of low viscosity epoxy coating sealing coat, and the thickness of wherein said slush inside liner is 2-15mm, and preferred thickness is 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 1.5-6.0MPa.
A kind of cast iron tube with composite corrosion-resistant lining, by cast iron tube and on the cast iron tube inwall lining be coated with one of above-mentioned composite corrosion-resistant lining and form.
The present invention has the cast iron tube of composite corrosion-resistant 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 with composite corrosion-resistant lining, its by cast iron pipe fittings and on the cast iron pipe fittings inwall lining be coated with one of above-mentioned composite corrosion-resistant lining and form.
The present invention has the cast iron pipe fittings of composite corrosion-resistant lining, and the cast iron materials of wherein said cast iron pipe fittings is a spheroidal graphite cast iron.
Among the present invention, low viscosity epoxy viscosity detecting method: detect according to the GB/T1723 standard, adopt to be coated with-4 flow cups.
The concrete preparation process of cast iron tube or pipe fitting that the present invention has composite corrosion-resistant lining 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, the mode of mill and/or press water flushing and/or sandblast is handled the slush liner surface in adopting, and removes dirts such as surperficial laitance; Adopt press water flushing or high-pressure blast to blow away the dirts such as dust of slush inside liner;
(4) coating of low viscosity epoxy coating
The mode of employing airless spraying or roller coating is coated on low viscosity epoxy coating on the slush liner and forms sealing coat.
The present invention has the cast iron tube of composite corrosion-resistant lining or pipe fitting has the following advantages and good effect:
1. this composite corrosion-resistant lining has combined Active Anticorrosion and passive corrosion-resistant combination property; Be that the enforcement of low viscosity epoxy coating layer 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 composite corrosion-resistant lining is because the enforcement of low viscosity epoxy coating layer, reduces or completely cut off the chance that slush liner alkali matter discharges in water, thereby guaranteed the quality of water quality.
3, epoxy paint layer is nontoxic after sealing coat solidifies.Therefore, can be used as the drinking water pipeline corrosion-proof lining fully, can not pollute, can not produce harmful material water quality.Said corrosion-proof lining 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
Dynamic long term seal performance detection; Be the cast iron tube or the pipe fitting that will have composite corrosion-resistant lining; 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 constantly supercharging, decompression, and the pH value that detects 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 the whole cast iron tube or pipe fitting with composite corrosion-resistant lining, soaks after 1 month the pH value variation≤0.5 of detection soaked in water.
4, the epoxy paint layer smooth surface has reduced surface friction drag, has strengthened water velocity, has saved conveying capacity.
5, above-mentioned cast iron tube with composite corrosion-resistant lining 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:
Corrosion-proof lining pipe of the present invention adopts the DN100 ductile iron pipe, and concrete preparation process is following:
The concrete preparation process of cast iron tube or pipe fitting that the present invention has composite corrosion-resistant lining 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, the mode of mill and/or press water flushing and/or sandblast is handled the slush liner surface in adopting, and removes dirts such as surperficial laitance; Adopt press water flushing or high-pressure blast to blow away the dirts such as dust of slush inside liner;
(4) coating of epoxy coating
The mode of employing airless spraying or roller coating is coated on low viscosity epoxy coating on the slush liner and forms sealing coat.
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 composite corrosion-resistant lining:
Table 1 slush inside liner
Table 2 is composition, thickness and the viscosity of low viscosity epoxy coating layer, can directly on the slush liner, apply low viscosity epoxy coating as sealing coat.
The composition of table 2 epoxy paint layer, thickness and viscosity
Through the detection that the different-thickness of slush liner, low viscosity epoxy coating layer The apparent phenomenon, 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 composite corrosion-resistant lining and performance test result
(annotating 1)
Test method: slush liner epoxy sealing coat 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 after 1 month the pH value variation of detection 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 loop around test:
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 from table 3,
The low viscosity epoxy thickness of coating layer all has inhibitory action to slush liner alkalescence between 10 μ m～100 μ m, can bear up to the loop around test of 25bar hydraulic pressure, 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 (10)
1. composite corrosion-resistant lining that contains low viscosity epoxy coating sealing coat; It is characterized in that: the low viscosity epoxy coating layer that comprises the slush inside liner and on the slush inside liner, apply; Wherein the low viscosity epoxy coating layer is as sealing coat; Be coated with-4 glass viscosity of the low viscosity epoxy coating of low viscosity epoxy coating layer in the time of 25 ℃ are≤120s that the thickness of low viscosity epoxy coating layer is 10-100 μ m.
2. according to the said composite corrosion-resistant lining that contains low viscosity epoxy coating sealing coat of claim 1, it is characterized in that: be coated with-4 glass viscosity of the epoxy coating of said low viscosity epoxy coating layer in the time of 25 ℃ are≤100s.
3. according to claim 1 or the 2 said composite corrosion-resistant linings that contain low viscosity epoxy coating sealing coat, it is characterized in that: the thickness of said low viscosity epoxy coating layer is 10-80 μ m.
4. according to the said composite corrosion-resistant lining that contains low viscosity epoxy coating sealing coat of claim 3, it is characterized in that: the slush composition of said slush inside liner is counted by mass parts:
Portland cement or sulfate-resistant cement or alumina cement: 100 parts,
River sand: 120-180 part,
Water: 30-70 part,
Water reducing agent: 0-1.5 part.
5. according to the said composite corrosion-resistant lining that contains low viscosity epoxy coating sealing coat of claim 1, it is characterized in that: the thickness of said slush inside liner is 2-15mm.
6. according to the said composite corrosion-resistant lining that contains low viscosity epoxy coating sealing coat of claim 5, it is characterized in that: the thickness of said slush inside liner is 3-13mm.
7. cast iron tube with composite corrosion-resistant lining is characterized in that: lining is coated with by cast iron tube with on the cast iron tube inwall, form like the described composite corrosion-resistant lining of one of claim 1-6.
8. according to the said cast iron tube with composite corrosion-resistant lining of claim 7, it is characterized in that: the cast iron materials of said cast iron tube is a spheroidal graphite cast iron.
9. cast iron pipe fittings with composite corrosion-resistant lining is characterized in that: lining is coated with by cast iron pipe fittings with on the cast iron pipe fittings inwall, form like the described composite corrosion-resistant lining of one of claim 1-6.
10. according to the said cast iron tube with composite corrosion-resistant lining of claim 9, it is characterized in that: the cast iron materials of said 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 201110224559 CN102297318B (en) | 2011-08-05 | 2011-08-05 | Compound antisepsis inner lining containing low-viscosity epoxy coating sealing layer and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110224559 CN102297318B (en) | 2011-08-05 | 2011-08-05 | Compound antisepsis inner lining containing low-viscosity epoxy coating sealing layer and application thereof |
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| CN102297318A CN102297318A (en) | 2011-12-28 |
| CN102297318B true CN102297318B (en) | 2012-12-05 |
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| CN107191692A (en) * | 2017-07-28 | 2017-09-22 | 芜湖新兴铸管有限责任公司 | A kind of cast iron pipe inner lining structure and its production technology |
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 outer anti corrosive coating in use for heavy repair of pipeline |
| 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 201110224559 patent/CN102297318B/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 outer anti corrosive coating in use for heavy repair of pipeline |
| 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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| CN102297318A (en) | 2011-12-28 |
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