CN1302858C - Process for coating polyurethane on inner and outer surface of nodular graphite cast iron pipe - Google Patents
Process for coating polyurethane on inner and outer surface of nodular graphite cast iron pipe Download PDFInfo
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- CN1302858C CN1302858C CNB2004100030770A CN200410003077A CN1302858C CN 1302858 C CN1302858 C CN 1302858C CN B2004100030770 A CNB2004100030770 A CN B2004100030770A CN 200410003077 A CN200410003077 A CN 200410003077A CN 1302858 C CN1302858 C CN 1302858C
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Abstract
The present invention relates to a technology for coating polyurethane on the inner surface and the outer surface of a nodular cast iron pipe. The technology for coating polyurethane on the inner surface and the outer surface of a nodular cast iron pipe successively comprises the following technological steps: 1. surfaces are treated; 2. the surface of a pipeline is repaired, and the large defects of the surfaces of the pipeline such as a pit with a diameter larger than 2mm needs to be filled and leveled by a putty; 3. the pipeline is heated, and the optimum heating temperature is from 20 to 80 DEG C. 4. the inner surface is sprayed, a high-pressure gas-free spraying machine is started when the temperature of the pipeline meets the requirement, and a spraying trolley drives a spray gun to spray at a constant speed; 5. the outer surface is sprayed, the high-pressure gas-free spraying machine is started when the temperature of the pipeline meets the requirement, and the spraying trolley drives the spray gun to spray at the constant speed; 6. a coating layer is detected; 7. a finished product is packaged. In the surface treatment, the shot blasting process of the outer surface and the grinding process of the inner surface are carried out. In the detection of the coating layer, the thickness of the coating layer needs to reach a specific thickness, and an electric spark is used for detecting. The present invention has the advantages of simple and convenient construction method, wide coating layer application temperature range, high coating layer mechanical strength, stable chemical performance and no pollution for ecological environment.
Description
(1), technical field
The invention belongs to a kind of coated technique of ductile iron pipe surfaces externally and internally.
(2), background technology
At present, domestic ductile iron pipe inner surface lining cement, outer surface coal powder injection tar asphalt.Coal tar pitch coating has following shortcoming: (1) coal tar asphalt is a solvent based coating, the solvent evaporates contaminated environment, and coal tar asphalt is a carcinogen, and the harm workman is healthy, and country has expressly provided and has banned use of coal tar asphalt coating; (2) drying time slow, need advance curing oven and be heating and curing, not only increase production cost, and influence production efficiency; (3) coal tar asphalt coating solid content is low, and coating thickness is restricted, and thickness range is 70～100 μ m; (4) bituminous coating bad mechanical property is big as poor adhesive force, fragility, wear no resistance; (5) the bituminous coating resistance to chemical attack is poor, and is poor as resistance to acids and bases, salt fog resistance is poor.Cementitious coating has following shortcoming: (1), cementitious coating need health, and rhythm of production is slow; (2), cementitious coating is alkaline, not acidproof; (3), the cementitious coating rough surface, cause water resistance big, cause pipeline to carry energy waste; (4) cementitious coating fragility is big, and easily crackle easily comes off; (5) cementitious coating is not wear-resisting, and service life is short, and the water delivery life-span is generally in 20～30 years.
(3), summary of the invention
In order to overcome the shortcoming of prior art, the invention provides a kind of polyurethane coating technology of ductile iron pipe surfaces externally and internally, not only construction method is easy for it, coating Applicable temperature scope is wide, and coating machine intensity height, stable chemical performance, pollution-free to ecological environment.
Processing step of the present invention is successively: 1, surface treatment.(1), the outer surface ball blast, pipeline external surface must oil removing, the Sa2.5 level eliminates rust; (2) inner surface polishing, inner surface of pipeline has more casting flaw such as projection etc., must polish flat before the spraying.2, pipe surface is repaired, and the defective that pipe surface is bigger as the pit of diameter greater than 2mm, need be filled and led up pit with putty.3, pipeline heating, heating-up temperature is 20～80 ℃.4, inner surface spraying when pipe temperature reaches requirement, starts high pressure airless spray equipment, and the spraying dolly drives spray gun and at the uniform velocity sprays.5, outer surface spraying when pipe temperature reaches requirement, starts high pressure airless spray equipment, and the spraying dolly drives spray gun and at the uniform velocity sprays.6, coating detects.(1) coating layer thickness must reach specific thickness; (2) electric spark detects, and checking has free of pinholes, has the place of pin hole to repair.7, finished product packing.
The present invention compared with prior art has following advantage: 1, all have excellent adhesive force with wide variety of substrates such as metal, plastics, concrete, by the proper formula screening, can obtain the system that adhesive force intensity surpasses polyurethane-urea elastomer self intensity; 2, mechanical strength height, anti-rock impact, anti-soil stress, easy damaged not in the carrying hoisting process; 3, excellent in abrasion resistance is 10 times of charcoal steel; 4, low temperature flexibility is good, and coating can be because of not round the clock, the variation of four seasons environment temperature and cracking and obscission occur; 5, stable chemical performance, resistance to medium is outstanding, except that strong dissolving such as dimethyl formamide, carrene, hydrofluoric acid, the concentrated sulfuric acid, red fuming nitric acid (RFNA), SPA, strong corrosive medium, can stand the long period of soaking of most corrosive mediums; 6, water-tolerant, impervious coefficient are 0, and long-term use can not be subjected to the erosion of shellfish biology under marine environment; 7, construction method is easy, and ground can not heat, even if also can spray as usual at-50 ℃; Because curing rate is fast, 5 second gel, can reach walking intensity in 1 minute, can carry after therefore having sprayed; 8, coating Applicable temperature scope is wide, and operating temperature is-50 ℃～120 ℃, and batch temperature can not ftracture because of variation of temperature up to 149 ℃; 9, solid content 100%, do not contain organic solvent, belongs to ep-type material, do not endanger workers ' health, and is pollution-free to ecological environment.
(4), the specific embodiment
Process flow diagram of the present invention is:
Processing step of the present invention is successively: 1, surface treatment.(1), the outer surface ball blast, pipeline external surface must oil removing, the Sa2.5 level eliminates rust; (2) inner surface polishing, inner surface of pipeline has more casting flaw such as projection etc., must polish flat before the spraying.2, pipe surface is repaired, and the defective that pipe surface is bigger as the pit of diameter greater than 2mm, need be filled and led up pit with putty.3, pipeline heating, optimum heating temperature is 20～80 ℃.4, inner surface spraying when pipe temperature reaches requirement, starts high pressure airless spray equipment, and the spraying dolly drives spray gun and at the uniform velocity sprays.The technological parameter of spraying sees Table 1.5, outer surface spraying when pipe temperature reaches requirement, starts high pressure airless spray equipment, and the spraying dolly drives spray gun and at the uniform velocity sprays.The technological parameter of spraying sees Table 2.6, coating detects.(1) coating layer thickness must reach specific thickness.(2) electric spark detects, and checking has free of pinholes, has the place of pin hole to repair.7, finished product packing.The pressure of table 1,2 described coating isocyanates and polyalcohol will equate or is equal substantially, if the pressure differential of two components surpasses 2Mpa, the phenomenon of mixed effect difference then can occur.
Table 1, inner surface spraying parameter table
| Project | The result | ||
| Coating parameter | Temperature ℃ | Isocyanates | 30～60 |
| Polyalcohol | 30～60 | ||
| Pressure P si | Isocyanates | 1500～3500 | |
| Polyalcohol | 1500～3500 | ||
| Viscosity cps | 150～400 | ||
| Equipment and spray parameters | High pressure airless spray equipment | The H20/35 of U.S. Gusmer company | |
| The spray gun model | GX-7 | ||
| Dolly walking speed Hz | 4～15 | ||
| Support roller rotating speed Hz | 30～50 | ||
| Mixing chamber | 451 | ||
| Nozzle | 212 | ||
| Atomization distance mm | 300～600 | ||
| The spraying pass | 1～5 | ||
Table 2, outer surface spraying parameter table
| Project | The result | ||
| Coating parameter | Temperature ℃ | Isocyanates | 30～60 |
| Polyalcohol | 30～60 | ||
| Pressure P si | Isocyanates | 1500～3500 | |
| Polyalcohol | 1500～3500 | ||
| Viscosity cps | 150～400 | ||
| Equipment and spray parameters | High pressure airless spray equipment | The H20/35 of U.S. Gusmer company | |
| The spray gun model | GX-7 | ||
| Dolly walking speed Hz | 2～20 | ||
| Support roller rotating speed Hz | 10～60 | ||
| Mixing chamber | 453 | ||
| Nozzle | 213 | ||
| Atomization distance mm | 200～600 | ||
| The spraying pass | 1～5 | ||
Claims (2)
1, a kind of coated technique of ductile iron pipe surfaces externally and internally comprises following processing step: one, surface treatment: (1), outer surface ball blast, pipeline external surface must oil removings, the Sa2.5 level eliminates rust; (2), inner surface polishing, must polish flat before the casting flaw spraying of inner surface of pipeline; Two, pipe surface is repaired, and the pipe surface diameter is filled and led up with putty greater than the pit of 2mm; It is characterized in that: three, pipeline heating, heating-up temperature is 20～80 ℃; Four, inner surface spraying starts high pressure airless spray equipment, and the spraying dolly drives spray gun and at the uniform velocity sprays, and coating is isocyanates and polyalcohol, and the temperature of coating is 30～60 ℃, and pressure is 1500～3500Psi, and viscosity is 150～400cps; The model of high pressure airless spray equipment is H20/35, and the spray gun model is GX-7, and mixing chamber is 451, and nozzle is 212, atomization distance 300～600mm; Dolly walking speed 4～15Hz, support roller rotating speed 30～50Hz; Spraying pass 1～5; Five, outer surface spraying starts high pressure airless spray equipment, and the spraying dolly drives spray gun and at the uniform velocity sprays, and coating is isocyanates and polyalcohol, and the temperature of coating is 30～60 ℃, and pressure is 1500～3500Psi, and viscosity is 150～400cps; The model of high pressure airless spray equipment is H20/35, and the spray gun model is GX-7, and mixing chamber is 451, and nozzle is 212, atomization distance 300～600mm; Dolly walking speed 4～15Hz, support roller rotating speed 30～50Hz; Spraying pass 1～5; Six, coating detects, and (1) coating layer thickness must reach specific thickness; (2) electric spark detects, and checking has free of pinholes, has the place of pin hole to repair; Seven, finished product packing.
2, coated technique according to claim 1 is characterized in that: the pressure of described coating isocyanates and polyalcohol equates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100030770A CN1302858C (en) | 2004-01-18 | 2004-01-18 | Process for coating polyurethane on inner and outer surface of nodular graphite cast iron pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100030770A CN1302858C (en) | 2004-01-18 | 2004-01-18 | Process for coating polyurethane on inner and outer surface of nodular graphite cast iron pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1557566A CN1557566A (en) | 2004-12-29 |
| CN1302858C true CN1302858C (en) | 2007-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100030770A Expired - Fee Related CN1302858C (en) | 2004-01-18 | 2004-01-18 | Process for coating polyurethane on inner and outer surface of nodular graphite cast iron pipe |
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| CN (1) | CN1302858C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102335643A (en) * | 2011-09-23 | 2012-02-01 | 新兴河北工程技术有限公司 | Spraying vehicle for inner wall of nodular cast iron pipe |
| CN104707766B (en) * | 2013-12-13 | 2017-01-04 | 哈尔滨朗格斯特节能科技有限公司 | Prefabricated direct-buried thermal insulation pipe polyurethane coating technique |
| 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 |
| CN105562309A (en) * | 2014-10-14 | 2016-05-11 | 光隆股份有限公司 | Natural paint coating process for cast iron kettle |
| CN104722468B (en) * | 2015-02-04 | 2017-04-12 | 鞍山海得隆防腐工程有限公司 | Method for coating steel tube with 100%-solid-content rigid polyurethane anticorrosive coatings |
| 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 |
| CN111330827A (en) * | 2020-04-10 | 2020-06-26 | 北京永逸舒克防腐蚀技术有限公司 | Corrosion protection method for gas lock well equipment |
| CN111889332A (en) * | 2020-08-06 | 2020-11-06 | 芜湖新兴铸管有限责任公司 | Novel polyurethane coating repairing method for nodular cast iron pipe fitting |
| CN114292581A (en) * | 2021-12-27 | 2022-04-08 | 国铭铸管股份有限公司 | Polyurethane coating material for nodular cast iron pipe and spraying method thereof |
| CN116197091A (en) * | 2023-01-09 | 2023-06-02 | 河北中和铸造有限公司 | Valve spraying process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87104066A (en) * | 1987-06-08 | 1987-12-23 | 河北省泊头市铸锅厂 | Plastic-coated toilet utensil made of cast iron and manufacture method thereof |
| CN1085134A (en) * | 1992-10-14 | 1994-04-13 | 夏志良 | Technique for coating inside wall of metal pipe with plastic powder |
| CN1341841A (en) * | 2001-07-30 | 2002-03-27 | 高原 | Processing process of cast iron radiator |
| KR20030030233A (en) * | 2001-10-09 | 2003-04-18 | 주식회사 보명 | Method of surface painting of streetlight pole made of castiron |
-
2004
- 2004-01-18 CN CNB2004100030770A patent/CN1302858C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87104066A (en) * | 1987-06-08 | 1987-12-23 | 河北省泊头市铸锅厂 | Plastic-coated toilet utensil made of cast iron and manufacture method thereof |
| CN1085134A (en) * | 1992-10-14 | 1994-04-13 | 夏志良 | Technique for coating inside wall of metal pipe with plastic powder |
| CN1341841A (en) * | 2001-07-30 | 2002-03-27 | 高原 | Processing process of cast iron radiator |
| KR20030030233A (en) * | 2001-10-09 | 2003-04-18 | 주식회사 보명 | Method of surface painting of streetlight pole made of castiron |
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| Publication number | Publication date |
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| CN1557566A (en) | 2004-12-29 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Huangshi Xinxing Pipes Co., Ltd. Assignor: Xinxing Ductile Iron Pipes Co., Ltd. Contract fulfillment period: 2009.6.8 to 2014.6.17 contract change Contract record no.: 2009420000078 Denomination of invention: Process for coating polyurethane on inner and outer surface of nodular graphite cast iron pipe Granted publication date: 20070307 License type: Exclusive license Record date: 2009.7.23 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.6.8 TO 2014.6.17; CHANGE OF CONTRACT Name of requester: HUANGSHI XINXING PIPE INDUSTRY CO., LTD. Effective date: 20090723 |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Taojiang Xinxing Fittings Co., Ltd. Assignor: Xinxing Ductile Iron Pipes Co., Ltd. Contract fulfillment period: 2009.10.21 to 2023.10.20 contract change Contract record no.: 2009430000190 Denomination of invention: Process for coating polyurethane on inner and outer surface of nodular graphite cast iron pipe Granted publication date: 20070307 License type: Exclusive license Record date: 20091110 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.10.21 TO 2023.10.20; CHANGE OF CONTRACT Name of requester: TAOJIANG XINXING PIPES CO., LTD Effective date: 20091110 |
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| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: Taojiang Xinxing Fittings Co., Ltd. Assignor: Xinxing Ductile Iron Pipes Co., Ltd. Contract record no.: 2009430000190 Date of cancellation: 20111223 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070307 Termination date: 20140118 |