CN101758013A - Process for spraying polyurethane on inner wall of nodular cast iron pipe - Google Patents
Process for spraying polyurethane on inner wall of nodular cast iron pipe Download PDFInfo
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- CN101758013A CN101758013A CN200910075898A CN200910075898A CN101758013A CN 101758013 A CN101758013 A CN 101758013A CN 200910075898 A CN200910075898 A CN 200910075898A CN 200910075898 A CN200910075898 A CN 200910075898A CN 101758013 A CN101758013 A CN 101758013A
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Abstract
The invention relates to a process for spraying polyurethane on the inner wall of a nodular cast iron pipe, in particular to the process for spraying the polyurethane on the inner wall of the DN100-DN300 nodular cast iron pipe. The steps of the process are as follows: 1. processing the inner surface: (1) removing rust and oxide skins; (2) shot-blasting, further removing the rust on the surface of the nodular cast iron pipe, and eliminating stress; (3) removing floating dust; 2. heating and drying; 3. preparing for the spraying: (1) storing coatings; (2) stirring the coatings; (3)_heating and heat-preserving the coatings; (4)_spraying for trial; 4. spraying the polyurethane: polyurethane components A and B are heated, filtered and heat-preserved according to the volume ratio of 1:1, are conveyed into a special mixer under high pressure for high-speed collision mixing or spiral mixing, and are then sprayed onto the surface of the nodular cast iron pipe by a spray gun or a spray cup at high speed in an atomized manner; 5. cleaning the mixer and the spray gun or the spray cup. The thickness of a film formed in one step can be up to 3mm and the adhesive power of the coatings is high, so that the invention can meet the demand for spraying the polyurethane on the inner wall of the small-caliber nodular cast iron pipe.
Description
Technical field
The present invention relates to the process for spraying polyurethane on inner wall of nodular cast iron pipe of a kind of process for spraying polyurethane on inner wall of nodular cast iron pipe, particularly DN100-DN300.
Background technology
In the production process of spheroidal graphite cast-iron extensive use water treatment, along with the needs of human development and environment, increasing water treatment project is had higher requirement to employed pipeline and coating thereof.Advantage such as that polyurethane coating has is wear-resisting, corrosion-resistant, resistance coefficient is little is very suitable for the inside coating of spheroidal graphite cast-iron pipeline is had the pipeline of specific (special) requirements, thereby enjoys the user to favor.At present at home, the external most widely used ductile iron pipe inside and outside coating overwhelming majority is used asphalt caulk, epoxy resin, cement lining.Developed spray spraying polyurethane coating in the above specification ductile iron pipe of DN300 abroad, but DN100～DN300 specification ductile iron pipe is owing to complex process, control difficulty are big, qualification rate is low, production efficiency is low, also has only a few countries such as France, Switzerland to grasp the technology of small dimension ductile iron pipe inner wall spraying high density polyurethane coating at present in the world wide.
Plain asphalt coating technology technology is simple, but antiseptic power is poor, seriously pollutedly is unfavorable for enhancement of environment.
The liner cementitious coating uses extensively, but antiseptic power is poor, and intensity is low, can not use special corrosion-proof pipe line, and the hydraulic resistance coefficient is big, the energy consumption height.
Epoxy coating technology antiseptic power is higher relatively, but the highest film forming thickness is no more than 500 microns, and needs repeatedly application, and coating adhesion is poor.
Summary of the invention
In order to overcome the shortcoming of prior art, the invention provides a kind of process for spraying polyurethane on inner wall of nodular cast iron pipe, its one-pass film-forming thickness can reach 3 millimeters, and the coating adhesion height can satisfy small-bore spraying polyurethane on inner wall of nodular cast iron pipe.
The present invention solves the technical scheme that its technical problem takes: comprise the following steps: 1, inner surface treatment: (1) ductile iron pipe inner wall emery wheel mechanical grinding reaches rust cleaning, scale removal, Cast Iron Surface slag blanket substantially and handles clean effect; (2) bead, further the effect that the spheroidal graphite cast-iron pipe internal surface is eliminated rust, eliminates stress guarantees not have attachments such as visible grease, dirt, inner surface oxide skin, iron rust, shows even metal gloss; (3) floating ash cleaning purges by high pressure nitrogen, dispels the foreign material that produce in surperficial dust and the sandblast process; 2, heating, drying is handled: by gas-fired furnace ductile iron pipe is carried out heating, drying and handle, reach and drive away the purpose that moisture, tubing are heated; 3, spraying is prepared: the depositing of (1) coating, and polyurethane coating reacts with moisture easily, answers airtight preservation, leaves the place of cool place, drying, ventilation in; (2) stirring of coating, before whenever changing one barrel of virgin material or stop spraying and all need to stir, guarantee that paint ingredient, color are even, after equipment stops spraying, spray pump is back in the storage tank automatically by A, B component spray gun, the material pipe that refluxes automatically, by pneumatic stirrer virgin material or storage period is stirred above 1 hour grouping; (3) heating of coating and insulation, be the flowability that improves coating, the levelability of spraying, avoid since A, B component because holidaies such as the bubbling that temperature effect gelation rate and setting rate cause, pin hole, shrinkage cavities, guarantee Wen Wendu, spraying to coating heating-up temperature, material according to environment temperature, relative air humidity before the ductile iron pipe temperature adjust respectively; (4) examination spray, whether at the appointed time examination spray instrument can check inner gel, wire drawing, sclerosis with ductile iron pipe or other material, guarantees normal; 4, spraying: with polyurethane A, B component according to 1: 1 volume ratio heat, filtration, insulation, high-pressure delivery be to special-purpose blender, carry out in blender that high-speed impact mixes or spiral mixes, by spray gun or spray cup high speed atomizing spraying to the spheroidal graphite cast-iron tube-surface; 5, clean blender spray gun or spray cup.
The present invention can satisfy small-bore spraying polyurethane on inner wall of nodular cast iron pipe, and is accurate in scale, mixes fully, and the adhesive force height guarantees that coating reaches the physics of design, chemical index, realized that zero of this technology breaks through.
The specific embodiment
The present invention includes the following step:
1, inner surface treatment: (1) ductile iron pipe inner wall emery wheel mechanical grinding reaches rust cleaning, scale removal, the clean effect of Cast Iron Surface slag blanket processing substantially.The rotating speed of wheel grinding is 750 rev/mins, and the speed that moves is 1 meter/minute.(2) bead, further the effect that the spheroidal graphite cast-iron pipe internal surface is eliminated rust, eliminates stress guarantees not have attachments such as visible grease, dirt, inner surface oxide skin, iron rust, shows even metal gloss.The compressed-air actuated pressure of compressed air shotblasting machine is 0.5MPa, and compressed air shotblasting machine sandblast muzzle velocity is 50～70m/S, and the speed that the compressed air shotblasting machine shower nozzle moves is 0.5 meter/minute.The degree of depth of anchor line is 80um to the maximum behind the shot-peening.(3) floating ash cleaning purges by high pressure nitrogen, dispels the foreign material that produce in surperficial dust and the sandblast process.Ductile iron pipe surface derusting grade meets GB/T8923-1988, reaches Sa2.5-Sa3.
2, heating, drying is handled: by gas-fired furnace ductile iron pipe is carried out heating, drying and handle, reach and drive away the purpose that moisture, tubing are heated.The ductile iron pipe bake out temperature is 50～65 ℃.
3, spraying is prepared: the depositing of (1) coating, polyurethane coating reacts with moisture easily, answers airtight preservation, leaves the place of cool place, drying, ventilation in.Storage temperature is 15～30 ℃.(2) stirring of coating, before whenever changing one barrel of virgin material or stop spraying and all need to stir, guarantee that paint ingredient, color are even, after equipment stops spraying, spray pump is back in the storage tank automatically by A, B component spray gun, the material pipe that refluxes automatically, by pneumatic stirrer virgin material or storage period is stirred above 1 hour grouping.(3) heating of coating and insulation, be the flowability that improves coating, the levelability of spraying, avoid since A, B component because holidaies such as the bubbling that temperature effect gelation rate and setting rate cause, pin hole, shrinkage cavities, guarantee Wen Wendu, spraying to coating heating-up temperature, material according to environment temperature, relative air humidity before the ductile iron pipe temperature adjust respectively.A, B component heating-up temperature are 40 ℃, A, B component guarantee that Wen Wendu is 45 ℃, and the temperature before the ductile iron pipe spraying is 45～50 ℃ (4) examination spray, and examination spray instrument can be with ductile iron pipe or other material, check whether at the appointed time inner gel, wire drawing, sclerosis, guarantee normal.
4, spraying: with polyurethane A, B component according to 1: 1 volume ratio heat, filtration, insulation, high-pressure delivery be to special-purpose blender, carry out in blender that high-speed impact mixes or spiral mixes, by spray gun or spray cup high speed atomizing spraying to the spheroidal graphite cast-iron tube-surface.A, B component spray static pressure are 400～1000PSI, and pipe rotating speed: 60～100r/min, coating layer thickness are 1.2～1.5mm.Spray 1 time.
5, clean, owing to polyurethane A, B component mix back 15 seconds undercoating and harden fully, so thoroughly clean blender spray gun or spray cup with cleaning spray gun.Guarantee that equipment is not blocked, the consumption that greatly reduces urethane raw and clean material has improved site work environment, has reduced potential safety hazard.Cleaning the spray pump blast is 0.2MPa.
Claims (5)
1. process for spraying polyurethane on inner wall of nodular cast iron pipe, it is characterized in that: comprise the following steps: 1, inner surface treatment: (1) ductile iron pipe inner wall emery wheel mechanical grinding reaches rust cleaning, scale removal, Cast Iron Surface slag blanket substantially and handles clean effect; (2) bead, further the effect that the spheroidal graphite cast-iron pipe internal surface is eliminated rust, eliminates stress guarantees not have attachments such as visible grease, dirt, inner surface oxide skin, iron rust, shows even metal gloss; (3) floating ash cleaning purges by high pressure nitrogen, dispels the foreign material that produce in surperficial dust and the sandblast process; 2, heating, drying is handled: by gas-fired furnace ductile iron pipe is carried out heating, drying and handle, reach and drive away the purpose that moisture, tubing are heated; 3, spraying is prepared: the depositing of (1) coating, and polyurethane coating reacts with moisture easily, answers airtight preservation, leaves the place of cool place, drying, ventilation in; (2) stirring of coating, before whenever changing one barrel of virgin material or stop spraying and all need to stir, guarantee that paint ingredient, color are even, after equipment stops spraying, spray pump is back in the storage tank automatically by A, B component spray gun, the material pipe that refluxes automatically, by pneumatic stirrer virgin material or storage period is stirred above 1 hour grouping; (3) heating of coating and insulation, be the flowability that improves coating, the levelability of spraying, avoid since A, B component because holidaies such as the bubbling that temperature effect gelation rate and setting rate cause, pin hole, shrinkage cavities, guarantee Wen Wendu, spraying to coating heating-up temperature, material according to environment temperature, relative air humidity before the ductile iron pipe temperature adjust respectively; (4) examination spray, whether at the appointed time examination spray instrument can check inner gel, wire drawing, sclerosis with ductile iron pipe or other material, guarantees normal; 4, spraying: with polyurethane A, B component according to 1: 1 volume ratio heat, filtration, insulation, high-pressure delivery be to special-purpose blender, carry out in blender that high-speed impact mixes or spiral mixes, by spray gun or spray cup high speed atomizing spraying to the spheroidal graphite cast-iron tube-surface; 5, clean blender spray gun or spray cup.
2. process for spraying polyurethane on inner wall of nodular cast iron pipe according to claim 1, it is characterized in that: the compressed-air actuated pressure of the compressed air shotblasting machine of described bead is 0.5MPa, compressed air shotblasting machine sandblast muzzle velocity is 50～70m/S, and the speed that the compressed air shotblasting machine shower nozzle moves is 0.5 meter/minute.
3. process for spraying polyurethane on inner wall of nodular cast iron pipe according to claim 1 and 2 is characterized in that: the degree of depth of anchor line is 80um to the maximum after the described bead.
4. process for spraying polyurethane on inner wall of nodular cast iron pipe according to claim 1 is characterized in that: described polyurethane A, B component heating-up temperature are 40 ℃, and A, B component guarantee that Wen Wendu is 45 ℃, and the temperature before the ductile iron pipe spraying is 45～50 ℃.
5. process for spraying polyurethane on inner wall of nodular cast iron pipe according to claim 1 is characterized in that: described polyurethane A, B component spray static pressure are 400～1000PSI, and pipe rotating speed: 60～100r/min, coating layer thickness are 1.2～1.5mm, spray 1 time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910075898A CN101758013A (en) | 2009-11-06 | 2009-11-06 | Process for spraying polyurethane on inner wall of nodular cast iron pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910075898A CN101758013A (en) | 2009-11-06 | 2009-11-06 | Process for spraying polyurethane on inner wall of nodular cast iron pipe |
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| Publication Number | Publication Date |
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| CN101758013A true CN101758013A (en) | 2010-06-30 |
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| CN200910075898A Pending CN101758013A (en) | 2009-11-06 | 2009-11-06 | Process for spraying polyurethane on inner wall of nodular cast iron pipe |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527624A (en) * | 2011-12-31 | 2012-07-04 | 陕西天元材料保护科技有限公司 | Internal squeezing rapid coating method of pipe inner wall metal powder coating |
| CN102773207A (en) * | 2012-08-15 | 2012-11-14 | 黄石新兴管业有限公司 | Spraying process method and device for inner wall of small-caliber nodular cast iron pipe |
| CN103115219A (en) * | 2013-03-05 | 2013-05-22 | 北京羽林军石油科技有限公司 | Inner mouth repairing method of 100% solid content double-component epoxy resin small-bore pipeline |
| CN103691625A (en) * | 2014-01-14 | 2014-04-02 | 广西安钢永通铸管管业有限公司 | Lining coating technology for spheroidal graphite cast iron tube |
| CN105371059A (en) * | 2015-12-08 | 2016-03-02 | 朗格斯特哈尔滨环保节能产品制造有限公司 | Hard polyurethane foam plastic spraying heat preservation pipe and spraying method |
| CN106567545A (en) * | 2015-10-12 | 2017-04-19 | 南京坤佳防水防腐保温工程有限公司 | Inorganic fiber thermal insulation spraying construction method for pipe shaft |
| CN108548049A (en) * | 2017-05-16 | 2018-09-18 | 新兴铸管股份有限公司 | With the internally coated ductile iron pipe of anti-corrosion and its production technology |
| CN110860448A (en) * | 2019-11-26 | 2020-03-06 | 芜湖新兴铸管有限责任公司 | Novel polyurethane coating process for nodular cast iron pipe fitting |
| CN112756239A (en) * | 2021-01-17 | 2021-05-07 | 天华化工机械及自动化研究设计院有限公司 | Polyurethane spraying forming process for inner wall of concrete pipeline |
| CN114769100A (en) * | 2022-04-29 | 2022-07-22 | 江西国天成科技有限公司 | Spraying process and formula of high-flow oxidation-resistant and dirt-resistant coating for reinforcing inner wall of corrugated pipe |
-
2009
- 2009-11-06 CN CN200910075898A patent/CN101758013A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527624A (en) * | 2011-12-31 | 2012-07-04 | 陕西天元材料保护科技有限公司 | Internal squeezing rapid coating method of pipe inner wall metal powder coating |
| CN102773207A (en) * | 2012-08-15 | 2012-11-14 | 黄石新兴管业有限公司 | Spraying process method and device for inner wall of small-caliber nodular cast iron pipe |
| CN103115219A (en) * | 2013-03-05 | 2013-05-22 | 北京羽林军石油科技有限公司 | Inner mouth repairing method of 100% solid content double-component epoxy resin small-bore pipeline |
| CN103691625A (en) * | 2014-01-14 | 2014-04-02 | 广西安钢永通铸管管业有限公司 | Lining coating technology for spheroidal graphite cast iron tube |
| CN103691625B (en) * | 2014-01-14 | 2016-03-02 | 广西安钢永通铸管管业有限公司 | Ductile iron pipe coated lining technique |
| CN106567545A (en) * | 2015-10-12 | 2017-04-19 | 南京坤佳防水防腐保温工程有限公司 | Inorganic fiber thermal insulation spraying construction method for pipe shaft |
| CN105371059A (en) * | 2015-12-08 | 2016-03-02 | 朗格斯特哈尔滨环保节能产品制造有限公司 | Hard polyurethane foam plastic spraying heat preservation pipe and spraying method |
| CN108548049A (en) * | 2017-05-16 | 2018-09-18 | 新兴铸管股份有限公司 | With the internally coated ductile iron pipe of anti-corrosion and its production technology |
| CN110860448A (en) * | 2019-11-26 | 2020-03-06 | 芜湖新兴铸管有限责任公司 | Novel polyurethane coating process for nodular cast iron pipe fitting |
| CN112756239A (en) * | 2021-01-17 | 2021-05-07 | 天华化工机械及自动化研究设计院有限公司 | Polyurethane spraying forming process for inner wall of concrete pipeline |
| CN114769100A (en) * | 2022-04-29 | 2022-07-22 | 江西国天成科技有限公司 | Spraying process and formula of high-flow oxidation-resistant and dirt-resistant coating for reinforcing inner wall of corrugated pipe |
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Application publication date: 20100630 |