CN103949390A - Plastic coating process for galvanized pipe - Google Patents
Plastic coating process for galvanized pipe Download PDFInfo
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- CN103949390A CN103949390A CN201410197720.1A CN201410197720A CN103949390A CN 103949390 A CN103949390 A CN 103949390A CN 201410197720 A CN201410197720 A CN 201410197720A CN 103949390 A CN103949390 A CN 103949390A
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- plastic
- galvanized pipe
- pipe
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- galvanized
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Abstract
The invention discloses a plastic coating process for a galvanized pipe. The process is characterized by comprising the following steps: A, performing surface treatment on the galvanized pipe which is not passivated to obtain the cleanness of more than Sa2(1/2) level and the roughness of 30-75 mu m, or comparing the galvanized pipe as an intermediate level by using a template method, preheating the galvanized pipe subjected to surface treatment at the temperature of 200-250 DEG C, preheating the galvanized pipe for 25-35min, performing plastic coating, placing the plastic-coated pipe into a drying oven with the temperature of 160-200 DEG C, and curing the pipe for 25-35min; B, performing surface treatment on the passivated galvanized pipe to obtain the roughness of Sa2.5 level, preheating the pipe for 25-35min at the temperature of more than 250 DEG C, performing plastic coating, placing the plastic-coated pipe into the drying oven with the temperature of 160-200 DEG C, and curing the pipe for 25-35min. The plastic coating process for the galvanized pipe has the advantage that the adhesive force between the inner wall of the galvanized pipe with double galvanized surfaces and a powder coating can be enhanced by using the process.
Description
Technical field
The present invention relates to a kind of powdery paints plastic spraying, specifically a kind of galvanized pipe plastic coating process.
Background technology
China's water resource is very in short supply, adopts the aqueduct of steel pipe or coating steel pipe, and in running, corrosion, the drainage of steel pipe are general, and what have is also very serious.In recent years, coastal big and medium-sized cities skyscraper is as emerged rapidly in large numbersBamboo shoots after a spring rain, and because construction quality improves, the building life-span can reach a century, for the requirement of hydraulic pipeline, and should be close with the service life of building.General steel pipe, even coating steel pipe, all do not reach its service life, and replace tubes is both uneconomical, affects again the building life-span midway.And general steel pipe easily produces " red rust " in water delivery, and coating steel pipe easily produces " white rust ".According to the sample investigation of Japan Energy comprehensive management technology association, hydraulic pipeline adopts the building of galvanized pipe, general galvanized pipe uses and starts to produce white rust in about 1 year, most generation pittings about 3 years, and 80% galvanizing pipe got rusty and leakage accident occurs in 10 years.Due to the stripping of zinc, to get rusty be very many to galvanized pipe in a short time.Due to the generation of red rust or white rust, directly make carried water quality pollute, people's domestic water quality declines greatly, directly affects people's the healthy and life-span.As for industry and medical water delivery, water quality is impure, also can produce beyond thought accident.
External as the U.S., Japan and other countries, more than 80% Construction Conveying Water pipe adopts external galvanized layer internal plastic coating steel pipe.At present, domestic some designing institute also directly clearly writes on the requirement of external galvanized layer internal plastic coating copper pipe in design in the time of Building Engineering Design.Outer surface of steel tube is zinc-plated, not only makes cost, and kept that hot dip galvanizing pipe is convenient to hitch, installation, transport, is resistance toly collided with, the premium properties such as resistance to mechanical wear, outer surface are attractive in appearance.Inner surface plastic-coated powdery paints, just can there are whole premium properties of plastic-coated steel, as bright and clean in film as minute surface, be difficult for breed bacteria and microorganism, have effective anti-structural behaviour, resistance of water conveyance coefficient is little, increases conveyance power of water, improve carrying capacity more than 10% than inwall coating steel pipe, reduce water delivery power consumption 15%.If after installing, Several Thiourea Derivatives on Zinc Plate Surface is coated with aluminium paint again, more than can reaching a century normal service life, this just and adapt the service life of building is avoided just changing at set intervals water-supply-pipe, not only economy but also can not affect because changing water-supply-pipe life-span of building.
Outer surface of steel tube is zinc-plated, inner surface with the state plastic-coated epoxide powder coating of black pipe after its adhesive force also relatively good, because steel, iron and alloy thereof are a kind of metals with active surface, the active material of this metal surface and epoxide powder coating can firmly combine.But investigate domestic many galvanizing producer according to us and can only do double side zinc coating, one side zinc coating is also universal at home, therefore wants to do external galvanized layer internal plastic coating steel pipe, must be just plastic-coated powdery paints under zinc-plated state at inner surface.
But the adhesion problem of galvanized pipe and powder coating is the difficult problem on our this industry technology always.Being that adhesive force index is difficult for reaching requirement on the one hand, is unstable on the other hand.Especially many users require external galvanized layer internal plastic coating steel pipe must reach the requirement of cutting the throat city-building professional standard CJ/T120 " feedwater plastic coated composite steel pipe ", in the standard of CJ/T120-2000 version, be the adhesive force of surveying FBE with method of scribing and cutting, also pass through than being easier to comparatively speaking, and in CJ/T120-2008 version standard, require the adhesive force of FBE to test with water-boiling method, namely adhesive force must be below 3 grades after high temperature boiling test for the FBE on galvanized pipe.This has become a great problem of external galvanized layer internal plastic coating steel pipe.
Summary of the invention
The object of this invention is to provide a kind of galvanized pipe plastic coating process, this technique can improve the adhesive force between galvanized pipe inwall and powder coating after double side zinc coating.
In order to realize this purpose, technical scheme of the present invention is: a kind of galvanized pipe plastic coating process, it is characterized in that: this technique comprises: first judge that whether this galvanized pipe is through transpassivation, then treat with a certain discrimination: A, the galvanized pipe of unpassivated is carried out to surface treatment, above-mentioned surface treated galvanized pipe is carried out to preheating, preheat temperature is 200 DEG C-250 DEG C, direct plastic-coated after preheating 25-35min, and the pipe fitting after plastic-coated is placed in the curing 20-40min of baking oven of 160-200 DEG C; B, to the galvanized pipe of passivation through surface treatment, and through more than 250 DEG C preheating temperature 25-35min plastic-coated, the pipe fitting after plastic-coated is placed in the baking oven of 160-200 DEG C and solidifies 20-40min.Wherein in B, the galvanized pipe of passivation is first carried out to surface treatment, then after more than 250 DEG C preheating temperature 25-35min, carry out again plastic-coated after being cooled to 150-180 DEG C; Or the galvanized pipe of passivation, first through more than 250 DEG C preheating temperature 25-35min, is carried out to surface treatment after cooling again, be then heated to 180-220 DEG C and carry out plastic-coated.
The invention has the advantages that and adopt galvanized pipe plastic coating process of the present invention can improve the adhesive force between galvanized pipe inwall and powder coating after double side zinc coating, in the hot water of 95 DEG C ± 3 DEG C, boiling in the hot water of 24h or 75 DEG C ± 3 DEG C and boil 48h according to the requirement of CJ/T120 " feedwater plastic coated composite steel pipe " standard appendix A, the adhesive force between galvanized pipe and powder Xu layer also can meet≤requirement of 3 grades.And the present invention carries out differentiated treatment to the galvanized pipe of passivation and unpassivated, can effectively save the energy.
Detailed description of the invention
Use respectively below through transpassivation with without the galvanized pipe of transpassivation and test, wherein preheat temperature is set in 200 DEG C of left and right, and be 30min preheating time, and the pipe fitting after preheating carries out plastic-coated immediately after taking out be a kind of method; Preheat temperature is set in 250 DEG C or higher temperature, is generally 250-300 DEG C, and be 25-35min preheating time, and the pipe fitting after preheating is cooled to a certain temperature, and to carry out plastic-coated be a kind of method again.Then the baking oven that the pipe fitting after plastic-coated is placed in to 180 DEG C solidifies 25-35min, and the coating after solidifying is carried out to surface state observation, boiling test, and flattening test, high temperature resistant test, with the adhesive force between testing coating and galvanized pipe and heatproof situation.
Embodiment 1
By two-sided all not the galvanized pipe of passivation first carry out inwall blasting treatment, make it cleannes and reach Sa2
1/
2more than level, roughness is 30 μ m-75 μ m or is relatively intermediate by template method, is then placed in the baking oven preheating 30min of 200 DEG C, plastic-coated, and the baking oven that then pipe fitting after plastic-coated is placed in to 180 DEG C solidifies 30min.Pipe fitting after solidifying is taken out, and coating surface is smooth, without bubbling; Be placed in after the hot water of 95 DEG C ± 3 DEG C boils 24h and occur without bubbling phenomenon, adhesive force is 3 grades; Pipe fitting is flattened to 4/5 non-microcracked; After the hot test 1h of 300 DEG C, without bubbling, without coming off, face bag is dimmed.
Embodiment 2
Galvanized pipe after two-sided all passivation is first carried out to inwall blasting treatment, make it cleannes and reach Sa2
1/
2more than level, roughness is 30 μ m-75 μ m or is relatively intermediate by template method, is then placed in the baking oven preheating 30min of 200 DEG C, plastic-coated, and the baking oven that then pipe fitting after plastic-coated is placed in to 180 DEG C solidifies 30min.Pipe fitting after solidifying is taken out, and coating surface is smooth, without bubbling; Be placed in after the hot water of 95 DEG C ± 3 DEG C boils 24h and have bubbling; Pipe fitting is flattened to 4/5 non-microcracked; After the hot test 1h of 300 DEG C, without bubbling, without coming off, colour-darkening.
Embodiment 3
By two-sided all not the galvanized pipe of passivation first carry out inwall blasting treatment, make it cleannes and reach Sa2
1/
2more than level, roughness is 30 μ m-75 μ m or is relatively intermediate by template method, is then placed in the baking oven preheating 30min of 230 DEG C, plastic-coated, and the baking oven that then pipe fitting after plastic-coated is placed in to 180 DEG C solidifies 30min.Pipe fitting after solidifying is taken out, and coating surface is smooth, without bubbling; Be placed in after the hot water of 95 DEG C ± 3 DEG C boils 24h and occur without bubbling phenomenon, adhesive force is 1 grade; Pipe fitting is flattened to 4/5 non-microcracked; After the hot test 1h of 300 DEG C, without bubbling, without coming off, colour-darkening.
Embodiment 4
By two-sided all not the galvanized pipe of passivation first carry out inwall blasting treatment, make it cleannes and reach Sa2
1/
2more than level, roughness is 30 μ m-75 μ m or is relatively intermediate by template method, is then placed in the baking oven preheating 30min of 250 DEG C, then galvanized pipe is taken out from baking oven, being cooled to surface temperature is 150 DEG C of plastic-coateds again, and the baking oven that then pipe fitting after plastic-coated is placed in to 180 DEG C solidifies 30min.Pipe fitting after solidifying is taken out, and coating surface is smooth, without bubbling; Be placed in after the hot water of 95 DEG C ± 3 DEG C boils 24h and occur without bubbling phenomenon, adhesive force is 1 grade; Pipe fitting is flattened to 4/5 non-microcracked; After the hot test 1h of 300 DEG C, without bubbling, without coming off, colour-darkening.
Embodiment 5
The galvanized pipe of two-sided all passivation is first carried out to inwall blasting treatment, make it cleannes and reach Sa2
1/
2more than level, roughness is 30 μ m-75 μ m or is relatively intermediate by template method, is then placed in the baking oven preheating 30min of 250 DEG C, then galvanized pipe is taken out from baking oven, being cooled to surface temperature is 150 DEG C of plastic-coateds again, and the baking oven that then pipe fitting after plastic-coated is placed in to 180 DEG C solidifies 30min.Pipe fitting after solidifying is taken out, and coating surface is smooth, without bubbling; Be placed in after the boiled water of 95 DEG C ± 3 DEG C boils 24h and have bubbling; Pipe fitting is flattened to 4/5 non-microcracked; After the hot test 1h of 300 DEG C, without bubbling, without coming off, color
Dimmed.
Result shows: directly plastic-coated is also not curing after lower temperature preheating for the galvanized pipe of passivation, the indices of its coating can reach requirement, and galvanized pipe after passivation must carry out preheating under the high temperature more than 250 DEG C, then pipe fitting is cooled to a certain temperature spot and carries out plastic-coated again and solidify as surface temperature to 150 DEG C, its indices of the coating obtaining just can reach requirement.
Therefore then, according to one embodiment of present invention, a kind of galvanized pipe plastic coating process, is characterized in that: whether first distinguish this galvanized pipe through transpassivation: A, to the galvanized pipe of unpassivated carry out surface go to reason, make it cleannes and reach Sa2
1/
2more than level, roughness be 30 μ m-75 μ m or with template method relatively for middle rank, above-mentioned surface treated galvanized pipe is carried out to preheating, preheat temperature is 200 DEG C-250 DEG C, plastic-coated after preheating 25-35min, the pipe fitting after plastic-coated is placed in the curing 2535min of baking oven of 160-200 DEG C; B, to the galvanized pipe of passivation through surface treatment, make it cleannes and reach Sa2
1/
2level more than, roughness be 30 μ m-75 μ m or with template method relatively for middle rank, and after more than 250 DEG C preheating temperature 25-35min plastic-coated, the pipe fitting after plastic-coated be placed in 160-200 DEG C baking oven solidify 25-35min.
Plastic-coated of the present invention powdery paints used, formed by mass percentage by thermosetting resin, curing agent, pigment, filler and auxiliary agent, wherein thermosetting resin 30～60%, hardener dose accounts for 4.5～30%, pigment and amount of filler account for 20～30%, auxiliary dosage accounts for 2～12%, and the summation of each constituent mass percentage is 100%.Described thermosetting resin is epoxy resin.Described epoxy resin can be bisphenol A type epoxy resin, or novolac epoxy resin.Curing agent can be selected dicyandiamide or replace dicyandiamide or sebacic dihydrazide or phenolic hydroxyl group resin, or preferred phenolic hydroxyl group resin.Described auxiliary agent is the combination of a kind of in levelling agent, degasser, fluffy powder, curing accelerator, antioxidant or defoamer or at least two kinds.Levelling agent can be selected Voncoat R 3310 or acrylate copolymer, as: levelling agent 503 or levelling agent 504; Degasser can be selected benzoin, claims again diphenylhydroxyethanone (being commonly called as styrax); Curing accelerator can be selected 2 monomethyl imidazoles, 2 one benzylimidazolines, ring amidine, croak pyridine, guanidine, triaizine compounds, urea derivative etc.; Fluffy powder is generally selected aerosil (claiming again white carbon); Oxidant is generally selected hindered phenol antioxygen 1010; Defoamer can be selected YPE defoamer, also can select common defoamer ZS-601 or high effective antifoaming agent ZS-603.Described filler is selected from ceramic fine bead, glass microballoon, mica powder, one or more in aluminium powder, stainless steel powder, cadmium powder, silica, barium sulfate etc.Described pigment is selected from the red pigment such as iron oxide red, chrome red.
In order to reduce solidification temperature or to reduce hardening time, curing accelerator FC31 and 803A in the present invention, are also added in addition; Because hot dip galvanizing pipe film when the application easily produces the disadvantages such as particle (particle) or fire pit, in the present invention, add defoamer ZS-601; In addition because the adhesive force between hot dip galvanizing pipe and coating is poor, especially while boiling in hot water, zinc and iron produce after potential corrosion, coating can monoblock be peeled off especially from galvanized pipe, in order to address this problem, the present invention has improved plastic spraying, makes the adhesive force after ammonium zinc pipe plastic-coated reach 3 grades of following standards.Powder coating product is pressed the construction of high pressure electrostatic painting method by the present invention, concrete coating process be first preheating pipe fitting to powdery paints melt temperature, then the powdery paints after fluid bed fluidisation is sprayed on pipe fitting, then solidified coating at a certain temperature, make it form fine and close heatproof coating, solidification temperature is 160 DEG C～200 DEG C, and be 25～30min hardening time.
This plastic-coated by the preparation method of powdery paints is: the thermosetting resin that is 30～60% by mass percent, 4～30% curing agent, 20～30% color stuffing and 2～5% auxiliary agent carry out premixed (incorporation time is controlled at 5～10min) through high-speed mixer, then extrude with melt extruder that (district's temperature is controlled at 40-50 DEG C, two district's temperature are controlled at 60-70 DEG C, three district's temperature are controlled at 110～130 DEG C), and be cooled to room temperature by chill roll and salband equipment, be ground into thin slice with disintegrating apparatus again, grind broken thin slice fine powder with air classification, then these fine powders mince and separate and obtain powder coating product by 120 order rotary screens through cyclone separator.The process equipment wherein relating to is prior art, does not repeat them here.
This plastic-coated can bear the high temperature of 300 DEG C and the low temperature of-30 DEG C with powdery paints, has good adhesive force between the coating after plastic-coated and base material.Use this plastic-coated powder and adopt electrostatic spraying, an application can reach thickness 300～400 μ m, can reach performance requirement through a baking-curing, and application sunlight labor productivity is high.And the powdery paints not spraying up when application can recycle, the utilization rate of coating is very high, can reach more than 98%.And compared with galvanizing extinguishing pipe, the environmental protection more of powdery paints plastic-coated fire protection pipeline.
Surface treatment in this technique is: the one in pickling, phosphatization, shot-peening, sandblast, ball blast etc., preferably sandblast.Plastic coating method is the one in high pressure electrostatic painting, suction painting, fluidized bed dipping.These technology are prior art and do not repeat them here.
Claims (6)
1. a galvanized pipe plastic coating process, it is characterized in that: this technique comprises: first judge that whether this galvanized pipe is through transpassivation, then treat with a certain discrimination: A, the galvanized pipe of unpassivated is carried out to surface treatment, above-mentioned surface treated galvanized pipe is carried out to preheating, preheat temperature is 200 DEG C-250 DEG C, plastic-coated after preheating 25-35min, the pipe fitting after plastic-coated is placed in the curing 25-35min of baking oven of 160-200 DEG C; B, to the galvanized pipe of passivation through surface treatment, and after more than 250 DEG C preheating temperature 25-35min plastic-coated, the pipe fitting after plastic-coated is placed in the baking oven of 160-200 DEG C and solidifies 25-35min.
2. galvanized pipe plastic coating process as claimed in claim 1, is characterized in that, in B, the galvanized pipe of passivation is first carried out to surface treatment, then after more than 250 DEG C preheating temperature 25-35min, carries out plastic-coated after being cooled to 150-180 DEG C again.
3. galvanized pipe plastic coating process as claimed in claim 1, is characterized in that wherein in B the galvanized pipe of passivation first through more than 250 DEG C preheating temperature 25-35min, carries out surface treatment after cooling again, is then heated to 180-220 DEG C and carries out plastic-coated.
4. galvanized pipe plastic coating process as claimed in claim 2 or claim 3, is characterized in that described surface treatment is: the one in pickling, phosphatization, shot-peening, sandblast, ball blast.
5. galvanized pipe plastic coating process as claimed in claim 2 or claim 3, it is characterized in that plastic coating method be high pressure electrostatic painting, inhale be coated with, one in fluidized bed dipping.
6. galvanized pipe plastic coating process as claimed in claim 2 or claim 3, it is characterized in that plastic-coated powdery paints used is made up of by mass percentage thermosetting resin, curing agent, pigment, filler and auxiliary agent, wherein thermosetting resin 30～60%, hardener dose accounts for 4.5～30%, pigment and amount of filler account for 20～30%, and auxiliary dosage accounts for 2～12%, and described thermosetting resin is epoxy resin, described epoxy resin is bisphenol A type epoxy resin, at least one in novolac epoxy resin; Described auxiliary agent is levelling agent, degasser, fluffy powder, curing accelerator, antioxidant, the combination of one or more in defoamer; Described filler is ceramic fine bead, glass microballoon, mica powder, the combination of one or more in aluminium powder, stainless steel powder, cadmium powder, silica, barium sulfate; Described pigment is iron oxide red or chrome red.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410197720.1A CN103949390A (en) | 2014-05-05 | 2014-05-05 | Plastic coating process for galvanized pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410197720.1A CN103949390A (en) | 2014-05-05 | 2014-05-05 | Plastic coating process for galvanized pipe |
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| CN103949390A true CN103949390A (en) | 2014-07-30 |
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| CN201410197720.1A Pending CN103949390A (en) | 2014-05-05 | 2014-05-05 | Plastic coating process for galvanized pipe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105154805A (en) * | 2015-10-12 | 2015-12-16 | 济南玫德铸造有限公司 | Galvanized dip coating malleable cast iron pipe fitting and preparation method thereof |
| CN112024337A (en) * | 2020-08-03 | 2020-12-04 | 荆大（荆州）汽车配件有限公司 | Process for coating epoxy resin on surface of galvanized pipe |
| JP7053277B2 (en) | 2018-01-10 | 2022-04-12 | 大成建設株式会社 | Galvanized steel pipe |
-
2014
- 2014-05-05 CN CN201410197720.1A patent/CN103949390A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105154805A (en) * | 2015-10-12 | 2015-12-16 | 济南玫德铸造有限公司 | Galvanized dip coating malleable cast iron pipe fitting and preparation method thereof |
| CN105154805B (en) * | 2015-10-12 | 2018-01-09 | 玫德集团有限公司 | A kind of zinc-plated dipping lacquer malleable cast iron pipe fitting |
| JP7053277B2 (en) | 2018-01-10 | 2022-04-12 | 大成建設株式会社 | Galvanized steel pipe |
| CN112024337A (en) * | 2020-08-03 | 2020-12-04 | 荆大（荆州）汽车配件有限公司 | Process for coating epoxy resin on surface of galvanized pipe |
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Application publication date: 20140730 |