CN1557570A - Plastic-blasting process for cast iron pipe external surface - Google Patents
Plastic-blasting process for cast iron pipe external surface Download PDFInfo
- Publication number
- CN1557570A CN1557570A CNA2004100017973A CN200410001797A CN1557570A CN 1557570 A CN1557570 A CN 1557570A CN A2004100017973 A CNA2004100017973 A CN A2004100017973A CN 200410001797 A CN200410001797 A CN 200410001797A CN 1557570 A CN1557570 A CN 1557570A
- Authority
- CN
- China
- Prior art keywords
- cast iron
- powder
- iron pipe
- pipe
- plastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The plastic spraying process for the outer surface of cast iron pipe includes shot blast treatment of the outer surface, fixing the pipe with fixture and earthing, rotating the fixture and the pipe, turning on the high voltage static electricity generator and electrostatic powder spraying gun near the outer surface of the pipe to make negatively charged plastic powder adsorbed onto the outer surface of the pipe owing to corona discharge, heating the pipe in roasting oven to make plastic powder smelt and cure to form homogeneous, continuous, level and smooth film. The present invention has the advantages of no preheating of the pipe, high plastic powder utilization up to 95 %, homogeneous and controllable film thickness, etc.
Description
(1), technical field
The invention belongs to a kind of cast iron pipe outer surface workmanship of spraying plastics.
(2), background technology
In recent years, along with the enhancing gradually of people's environmental consciousness, people's pair daily pursuits closely bound up with it requires more and more higher.Water delivery, gas transmission and oil pipeline are directly connected to daily life, and the treatment process that therefore must constantly strengthen its outer surface keeps abreast of the times.The workmanship of spraying plastics of using needs the workpiece preheating at present, and the plastic-blasting powder using efficiency is low, and the thickness of filming is wayward, especially is difficult to form continuous, level and smooth filming on the tip and the coarse surface of workpiece.
(3), summary of the invention:
In order to overcome the shortcoming of prior art, the invention provides a kind of cast iron pipe outer surface workmanship of spraying plastics, not preheating of workpiece, the powder using efficiency height, reach more than 95%, the thickness of filming evenly and is easily controlled, and all can form continuously, smoothly film at the tip of workpiece and coarse surface.
The present invention solves the technical scheme that its technical problem takes: at first the outer surface with cast iron pipe to be painted carries out Shot Blasting, cast iron pipe is fixed on the anchor clamps and ground connection then, anchor clamps drive the cast iron pipe rotation, open HV generator, the electrostatic dusting rifle is near the cast iron pipe outer surface, open the electrostatic dusting rifle, powder feeder will dust plastic powders in the cabinet deliver to the electrostatic dusting rifle diversion cup in, because diversion cup connects high voltage negative and produces corona discharge, produce intensive electric charge around it, negative electrical charge on the powder belt, under electrostatic force and compressed-air actuated effect, powder is adsorbed on ground connection uniformly on the anodal cast iron pipe outer surface, after send into the oven heating, powder melts is solidified or is plastified evenly, continuously, smooth, smooth films.
The present invention compared with prior art has following advantage: 1, not preheating of workpiece, but room temperature applies.2, powder using efficiency is up to more than 95%.3, apply thin (50 μ m～100 μ m), and evenly, the no sag phenomenon.4, all can form continuously, smoothly film on the most advanced and sophisticated and coarse surface of workpiece.5, easily be automated production.6, behind the cast iron pipe outer surface plastic-coated, except that having the good mechanical performance of cast tube itself, its overlay corrosion resistance by force can anti-strong acid, highly basic and other chemical attack, nontoxic, not corrosion, wear-resisting, resistance to impact good, osmotic-pressure-tolerant is strong.7, coating has good insulating properties and resistance to pressure, and-40 ℃～+ 80 ℃ scope uses that cold and heat succeed each other capable of circulation, coating is not aging, be full of cracks, thereby can use under rigorous environment such as cold, extremely hot area.
(4), the specific embodiment
At first the outer surface with cast iron pipe to be painted carries out Shot Blasting, then cast iron pipe to be painted is preheating to 100～160 ℃, and the workpiece The pre-heat treatment is in order further to increase metallic matrix and coating's adhesion.Then cast iron pipe is fixed on the anchor clamps and ground connection, anchor clamps drive the cast iron pipe rotation, open HV generator, the electrostatic dusting rifle is near the cast iron pipe outer surface, open the electrostatic dusting rifle, powder feeder will dust plastic powders in the cabinet deliver to the electrostatic dusting rifle diversion cup in, because diversion cup connects high voltage negative and produces corona discharge, produce intensive electric charge around it, negative electrical charge on the powder belt, under electrostatic force and compressed-air actuated effect, powder is adsorbed on ground connection uniformly on the anodal cast iron pipe outer surface, after send into oven heating, powder melts is solidified or is plastified evenly, continuously, smooth, smooth films.The thickness of described cast iron pipe outer wall plastic-blasting layer is 0.5～0.8mm.
Described HV generator is safe, reliable and stable, long service life, output voltage height and electric current is low, and the band protective device, and volume is little, in light weight in addition, energy consumption is low, easy to operate.Generally adopt 30～60kV aborning, current value is lower than 300uA.
The effect of described electrostatic dusting rifle is to produce good corona discharge, makes the maximum negative electrical charge of ejection powder belt, and the ejection powder is even.For this reason, the electrostatic dusting rifle should have desirable charged and diffusion structure.Charged formula and outer charged formula were two kinds in the charged form of electrostatic dusting rifle was divided into.The main difference of these two kinds of rifles is: the external electric field intensity of interior charged formula podwer gun is little, and back corona phenomenon be difficult for to take place, so when the amount of dusting is big, should use this podwer gun.Complex-shaped to workpiece in addition, the more favourable of re-entrant angle arranged.The external electric field intensity of electric podwer gun is big in addition.So coating efficiency height, range of application are also bigger, adaptability is strong.Can also the inside and outside charged podwer gun that combines.The effect of the diffusion mechanism of electrostatic dusting rifle is that powder is uniformly dispersed.Diffusion mechanism will can change spraying figure and area according to the difformity workpiece.And the spouting velocity of the powder that can slow down, powder produces " bounce-back " effect on workpiece when preventing to spray.The powder diffusion mechanism roughly has following several: collide dispersion method, air dispersion method, rotation dispersion method and dispersed with stirring method etc.The electrostatic dusting rifle divides portable and fixed two kinds, the fixed production line that generally is used for.
Described powder feeder is the supply spray gun that powdery paints is continuous, even, quantitative, is to obtain high efficiency, high-quality critical component in the electrostatic spraying.Powder feeder generally has three types by structure: pressure type, drawing-in type and mechanical type powder feeder etc.The drawing-in type powder feeder is with the most use at present, and has developed various ways: oscillating mode, agitating type, fluid bed and outside fluid bed drawing-in type powder feeder etc.
Described dust cabinet available metal plate and plastic plate processing.According to economy, durability, be easy to aspects such as construction and selected.Its pluses and minuses are compared as follows: the cabinet handling ease of dusting of metallic plate, low price, firm.Easily transportation and cleaning.But the efficient of dusting is low, and the chance that produces spark discharge is many.The cabinet powder that dusts of plastic plate is easily attached to inwall, easy cleaning, Miniaturizable.But manufacturing is difficult, Master Cost is high, fragile.The cabinet that dusts of plastic plate and metallic plate combination is applicable to automatic spraying production line.If adopt stainless steel to make spray room, top cover polypropylene board, then easy cleaning, colour changing are fast.The size of cabinet of dusting depends on by the quantity of size, transfer rate and the spray gun of spray thing.
The present invention can be used for the ductile iron pipe or the flexible interface gray cast iron tube of different-diameter.
Plastics in the described cabinet that dusts are thermoplastic polyester, polyvinyl chloride, polyolefin, the polyamide in the thermoplastic, also can be epoxy powder, polyester powder, acrylic clear powder, the polyurethane powders in the thermosetting plastics.Table 1,2 has been listed their pluses and minuses separately, can require according to user's difference to select for use.Table 3,4,5,6,7 has been listed the performance indications after the part coatings film forming.
Table 1 part thermoplastic powder coating pluses and minuses
| The powdery paints kind | Advantage | Shortcoming | Price |
| Thermoplastic polyester | But can thickly be coated with, be coated with install, the low-temperature bake of not priming | The deliquescing of being heated easily scratches, weather resisteant is poorer than the thermosetting polyester, not anti-solvent and alkali | Higher |
| Polyvinyl chloride | Can thickly be coated with, good springiness, anti-distortion, resistance to chemical reagents be good | Baking temperature and melt viscosity height, should not scumbling, to prime | Low |
| Polyolefin (polyethylene polypropylene etc.) | Can thickly be coated with, good springiness, anti-distortion, resistance to chemical reagents be good | Weather resisteant is poor, and the need that have are primed | Low |
| Polyamide | Physical property, wearability are good, hardness ratio polyolefin, polyvinyl chloride height, and heatproof reaches about 100 ℃ | Baking temperature height, melt viscosity height, the deliquescing of being heated | Higher |
Table 2 thermosetting powder coating performance relatively
| Kind | Advantage | Shortcoming | Main application |
| Epoxy powder | Storage-stable, adhesive force and anti-chemistry are very good, energy and the reaction of multiple curing agent | Weather resisteant is poor, ornamental poor slightly | Anticorrosion, insulation |
| Polyester powder | Extremely excellent weatherability and ornamental.Corrosion protection, electrical property and good mechanical properties | Skin is had stimulation, and hardness is not as good as epoxy powder | Flawless finish, anticorrosion, weather-proof |
| Acrylic clear powder | Extremely excellent weatherability, ornamental and soil resistance | Poor mechanical property, storage-stable are poor slightly | Flawless finish, weather-proof, corrosion-resistant |
| Polyurethane powder | Weatherability is splendid, storage property is good, excellent is ornamental, good physical and mechanical property, chemical proofing | There is gas to emit during baking, influences outward appearance | Flawless finish, weather-proof, corrosion-resistant |
Table 3 epoxide powder coating coating performance index
| Project | The epoxy powder kind | ||
| Epoxy has light powder paint | The epoxy matt powder coating | The epoxy glossless powdered coating | |
| Pulverulence | Color and luster does not evenly have caking | Color and luster does not evenly have caking | Color and luster does not evenly have caking |
| The color of filming and outward appearance | Smooth, allow slight tangerine peel color and meet colour atla | Smooth, allow slight tangerine peel color and meet colour atla | Smooth, allow slight tangerine peel color and meet colour atla |
| Pliability/mm | ??1 | ??≤2 | ??≤2 |
| Pencil hardness (H) | ??≥2H | ??≥2H | ??≥2H |
| Gloss (%) | ??≤85 | ??30～84 | ??＜20 |
| Adhesive force (level) | ??1 | ??1 | ??1 |
| Solidification temperature/℃ | ??160±2 | ??180±3 | ??180±2 |
| Hardening time/min | ??15 | ??12 | ??12 |
| Resistance to water (20h) | No change | No change | No change |
| Acid resistance (3%HCL, 20h) | No change | No change | No change |
Table 4 polyester powder coating coating technology index
| Project | Polyester powder coating | Polyester dim light powdery paints |
| Pulverulence | Color and luster is even, the nothing caking | Color and luster is even, the nothing caking |
| The color of filming and outward appearance | Smooth coating, allow slight tangerine peel, color meets colour atla | Smooth coating, allow slight tangerine peel, color meets colour atla |
| Pliability/mm | ?≥2 | ????≥2 |
| Gloss (%) | ?≥85 | ????＜85 |
| Impact toughness/N.cm | ?500 | ????500 |
| Solidification temperature/℃ | ?180±2 | ????180±2 |
| Hardening time/min | ?15 | ????15 |
| Resistance to water (20h) | No change | No change |
| Acid resistance (3%HCL, 20h) | No change | No change |
The table 5 polyamide powder physicochemical property table of filming
| Project | Performance indications | Project | Performance indications |
| Fusing point/℃ | 207 | Water absorption/mg.cm -2 | 2 |
| Density/g.cm -3 | 1.04～1.05 | Martin heat resistance/℃ | 42 |
| Bending strength/Mpa | 78～82 | Sheet resistance (ohm) | ＞10 14 |
| Tensile strength/Mpa | 50～54.9 | Shrinkage factor/(%) | 1～1.5 |
| Impact toughness/N.cm | 500 | With steel part adhesive strength/Mpa | 12.9 |
| Percentage elongation (%) | 200 | Adhesive force (level) | 2～3 |
| Oil resistivity (%) | 0.0004 |
Table 6 polyvinyl chloride main performance index
| Project | Experiment condition | Experimental result | |
| Soft PVC | RPVC | ||
| Density/g.cm -3 | 20℃ | 1.30～1.35 | 1.33～1.38 |
| Water absorption rate (%) | 20℃24h | 0.2～0.4 | 0.2～0.4 |
| Percentage elongation (%) | 20℃ | 120～140 | Below 10 |
| Electric insulation intensity/Europe .cm -1 | 20℃ | 4×10 13 | 2×10 10 |
| Gloss (%) | 60 ° of specular reflectivitys | 90～95 | 85～90 |
| Hardness | Pencil hardness | B～3B | H～3H |
| Abrasion performance/mg | 500g.1000r.20℃ | 15～20 | 15～20 |
The chemical property that table 7 polypropylene is filmed
| Experiment condition | The situation of change of filming | Experiment condition | The situation of change of filming | ||||
| Reagent name | Concentration (%) | Time/d | Reagent name | Concentration (%) | Time/d | ||
| Sulfuric acid | ????5 | ????90 | No change | Ethanol | ????96 | ????30 | No change |
| Nitric acid | ????35 | ????90 | Be yellow slightly | Ether | ????- | ????20 | Film expands |
| Hydrochloric acid | ????36 | ????90 | No change | Glycerine | ????- | ????90 | No change |
| Formic acid | ????85 | ????90 | No change | Toluene | ????- | ????1 | Film expands |
| Acetic acid | ????50 | ????30 | No change | Transformer oil | ????- | ????90 | No change |
| Caustic soda | ????15 | ????90 | No change | Benzene diformazan dibutylester | ????- | ????90 | No change |
| Ammoniacal liquor | ????15 | ????30 | No change | Vaseline | ????- | ????90 | No change |
| The salt saturated solution | ????- | ????90 | No change | Formaldehyde | ????- | ????90 | No change |
Claims (4)
1, a kind of cast iron pipe outer surface workmanship of spraying plastics, it is characterized in that: at first the outer surface with cast iron pipe to be painted carries out Shot Blasting, then cast iron pipe is fixed on the anchor clamps and ground connection, anchor clamps drive the cast iron pipe rotation, open HV generator, the electrostatic dusting rifle is near the cast iron pipe outer surface, open the electrostatic dusting rifle, powder feeder will dust plastic powders in the cabinet deliver to the electrostatic dusting rifle diversion cup in, because diversion cup connects high voltage negative and produces corona discharge, produce intensive electric charge around it, negative electrical charge on the powder belt, under electrostatic force and compressed-air actuated effect, powder is adsorbed on ground connection uniformly on the anodal cast iron pipe outer surface, after send into oven heating, powder melts is solidified or is plastified evenly, continuously, smooth, smooth films.
2, workmanship of spraying plastics according to claim 1 is characterized in that: described cast iron pipe to be painted is preheating to 100～160 ℃.
3, workmanship of spraying plastics according to claim 1 is characterized in that: the thickness of described cast iron pipe outer wall plastic-blasting layer is 0.5～0.8mm.
4, workmanship of spraying plastics according to claim 1, it is characterized in that: the plastics in the described cabinet that dusts are thermoplastic polyester, polyvinyl chloride, polyolefin, the polyamide in the thermoplastic, also can be epoxy powder, polyester powder, acrylic clear powder, the polyurethane powders in the thermosetting plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100017973A CN1557570A (en) | 2004-02-05 | 2004-02-05 | Plastic-blasting process for cast iron pipe external surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100017973A CN1557570A (en) | 2004-02-05 | 2004-02-05 | Plastic-blasting process for cast iron pipe external surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1557570A true CN1557570A (en) | 2004-12-29 |
Family
ID=34350658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100017973A Pending CN1557570A (en) | 2004-02-05 | 2004-02-05 | Plastic-blasting process for cast iron pipe external surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1557570A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101869755A (en) * | 2010-05-26 | 2010-10-27 | 章竹娇 | Production process of spinning handrail |
| CN104948847A (en) * | 2015-06-25 | 2015-09-30 | 新兴铸管股份有限公司 | Nodular cast iron pipe with two-dimension code pipe number pattern, spraying system and production method |
| CN105150895A (en) * | 2015-09-29 | 2015-12-16 | 王宜江 | Headrest rod surface treatment method |
| CN110614763A (en) * | 2019-10-24 | 2019-12-27 | 成都欧赛医疗器械有限公司 | Corona treatment process for dialyzer shell |
| CN113444995A (en) * | 2021-05-20 | 2021-09-28 | 南通莱鑫运动用品有限公司 | Metal surface treatment method for improving wear-resisting and rust-resisting properties of sports equipment |
| CN114887796A (en) * | 2022-05-13 | 2022-08-12 | 无锡市新达共创纳米科技有限公司 | Spraying processing technology for ceramic coating on surface of piston rod |
-
2004
- 2004-02-05 CN CNA2004100017973A patent/CN1557570A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101869755A (en) * | 2010-05-26 | 2010-10-27 | 章竹娇 | Production process of spinning handrail |
| CN101869755B (en) * | 2010-05-26 | 2012-02-01 | 章竹娇 | Production process of spinning handrail |
| CN104948847A (en) * | 2015-06-25 | 2015-09-30 | 新兴铸管股份有限公司 | Nodular cast iron pipe with two-dimension code pipe number pattern, spraying system and production method |
| CN105150895A (en) * | 2015-09-29 | 2015-12-16 | 王宜江 | Headrest rod surface treatment method |
| CN110614763A (en) * | 2019-10-24 | 2019-12-27 | 成都欧赛医疗器械有限公司 | Corona treatment process for dialyzer shell |
| CN110614763B (en) * | 2019-10-24 | 2022-02-11 | 成都欧赛医疗器械有限公司 | Corona treatment process for dialyzer shell |
| CN113444995A (en) * | 2021-05-20 | 2021-09-28 | 南通莱鑫运动用品有限公司 | Metal surface treatment method for improving wear-resisting and rust-resisting properties of sports equipment |
| CN114887796A (en) * | 2022-05-13 | 2022-08-12 | 无锡市新达共创纳米科技有限公司 | Spraying processing technology for ceramic coating on surface of piston rod |
| CN114887796B (en) * | 2022-05-13 | 2023-11-24 | 无锡市新达共创纳米科技有限公司 | Spraying processing technology for ceramic coating on surface of piston rod |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6528125B1 (en) | Corrosion resistant powder coated metal tube and process for making the same | |
| CN102233701B (en) | Color-coating steel plate and coating process | |
| CN102985765B (en) | Comprise the regenerative resource of energy converting structure and bearing components | |
| CN102152541B (en) | Method for preparing composite interlayer coating film on surface of engineering plastics | |
| TWI224629B (en) | Resin-lined steel pipe and method for manufacturing same | |
| CN101122019A (en) | Anticorrosion technology for composite coating of metal thermal spraying and powder coating electrostatic spraying | |
| US7018715B2 (en) | Organic coated steel having excellent rust preventive and corrosion preventive performances and rust preventing method for metal | |
| CN101440230A (en) | UV radiation curing coating for vacuum plating, production method and construction method | |
| CN101655179B (en) | Novel coating process of pipe anti-corrosion layer with three-layer structure | |
| US20200017694A1 (en) | Ultra low cure powder coatings | |
| CN1557570A (en) | Plastic-blasting process for cast iron pipe external surface | |
| CN102134438A (en) | Environmental friendly anticorrosion baking finish for water-based coiled materials | |
| CN109749537A (en) | Teflon coating and application thereof | |
| JP2000179752A (en) | Coated steel pipe | |
| JP2000178774A (en) | Double corrosion preventive wire and its production | |
| CN1297353C (en) | Plastic-blasting process for cast iron pipe inner surface | |
| CN214528801U (en) | Water-based flame-retardant color-coated steel plate | |
| JP2000177053A (en) | Coated metallic plate | |
| CN211921400U (en) | Water-based heat-insulating anticorrosive coating structure | |
| JP3240950B2 (en) | Polyolefin-coated steel pipe and method for producing the same | |
| JP2991061B2 (en) | Polyolefin resin-coated steel pipe and method for producing the same | |
| JP2988302B2 (en) | Polyolefin-coated steel pipe and method for producing the same | |
| JPH0369351A (en) | Precoated steel plate | |
| JP3572332B2 (en) | Exterior painted cast iron tube | |
| JP2004081971A (en) | Glittering coating forming method and coated product |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |