CN109465164A - A method of promoting bellows durability degree - Google Patents
A method of promoting bellows durability degree Download PDFInfo
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- CN109465164A CN109465164A CN201811600793.5A CN201811600793A CN109465164A CN 109465164 A CN109465164 A CN 109465164A CN 201811600793 A CN201811600793 A CN 201811600793A CN 109465164 A CN109465164 A CN 109465164A
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- Prior art keywords
- bellows
- polyethylene
- sand
- durability degree
- promoting
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/542—No clear coat specified the two layers being cured or baked together
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2507/00—Polyolefins
- B05D2507/01—Polyethylene
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The present invention provides a kind of methods for promoting bellows durability degree, it is characterised in that first carries out surface spray treatment to bellows, then carries out coating spraying, the coating spraying includes epoxy powder coating, polyethylene and thermosol composite powder coatings.The workflow of the application specification surface treatment, Passing Criteria after specifying surface treatment, second layer coating is made after polyethylene and thermosol are sufficiently mixed, reduce the processing step of anticorrosion with painting material, increase the thickness of anti-corrosion material, anti-corrosion effect is improved, the durability degree of bellows is improved.
Description
Technical field
The present invention relates to corrosion-proof technology for pipeline field more particularly to a kind of methods for promoting bellows durability degree.
Background technique
The anti-corrosion of bellows be usually by coating even compact coated on the metallic conduit surface through derusting, make its with
Various corrosive media isolations.And it needs otherwise the thorough clean of bellows surface processing before applying coating work
The bonding between pipeline and coating is influenced, the durability degree of bellows is influenced.
3PE anti-corrosive steel tube refers to 3-tier architecture polyolefin coating (MAPEC) outer anti-corrosive steel tube, is domestic common a kind of anti-
Rotten pipeline.It is other that there are also the anti-corrosion modes such as IPN8710, FBE epoxy powder, epoxide coal bituminous.3PE anti-corrosive steel tube base material includes nothing
Stitch steel pipe, spiral steel pipe and steel pipes with straight.Polyethylene (3PE) corrosion-inhibiting coating of three-decker is with its good corrosion resistance, anti-
Aqueous vapor permeability and mechanical property etc. are widely applied in plumbing installations.One erosion resistant coating of 3PE anti-corrosive steel tube is for buried
It is vital, the pipeline of same material for the durability degree of pipeline, some is embedded in underground decades and does not corrode, several years had
With regard to revealing.It is exactly because they use different external anti-corrosion layers.3PE anti-corrosion is generally made of 3-tier architecture: first layer ring
Oxygen powder, second layer adhesive and third layer polyethylene, what bottom was contacted with steel pipe face is epoxy powder anti-corrosion coating, thickness
Greater than 100um, middle layer is the copolymer adhesive with branched structure functional group, and with a thickness of 170~250um, surface layer is highly dense
Polyethylene anticorrosion coating is spent, with a thickness of 1.8~3.7mm.Manufacturing process is: first steel pipe heated, it will using electrostatic painting process
Epoxy powder sprays to steel tube surface, the epoxy powder for making epoxide powder coating fusing, solidifying and forming 120~250um of thickness
Coating, then adhesive Extrusion Coating, then polyethylene squeezes out cladding, finally cools and solidifies.It is this to need adhesive and poly- second
Alkene extrusion equipment, complex process.
Chinese patent 200420007424.2 discloses a kind of corrosion-inhibiting coating, using double-layer structure, i.e. epoxy powder coating
And polyethylene powder coating, since the epoxy powder binding force of simple polyethylene powders and bottom is bad, in manufacture work
Reheating is needed in skill, to reach the good combination of epoxide powder coating layer and polyethylene powder coating layer, carries out secondary add
Heat increases processing step while power consumption is big, and manufacturing cost is relatively high；This kind of double-layer structure also limits poly- second simultaneously
The thickness of alkene powder coating layer, and polyethylene is the main material of steel pipe corrosion-proof, the thickness of polyethylene increases, and antiseptic property is more
Good, the thickness of this polyethylene powder coating layer is only 450~550um, this makes this kind of anti-corrosion pipe bad anti-corrosion effect.
Summary of the invention
Anti-corrosion effect caused by overcome pretreatment existing in the prior art not up to standard, corrosion-inhibiting coating thickness insufficient is not held
Long problem, the present invention provides a kind of methods for promoting bellows durability degree.
A method of promoting bellows durability degree, which is characterized in that the steps include:
S1 carries out surface spray treatment to bellows；
S2 checks treatment effect；
The preparation of S3 polyethylene and thermosol composite powder；
The spraying of S4 epoxy powder；
The spraying of S5 polyethylene and thermosol composite powder；
S6 cooling and solidifying.
In the preferred embodiment of the present invention, before the spray treatment of surface, by bellows surfaces externally and internally cut slag, burr,
The dirts such as grease are by hand or mechanical sweeper method is removed completely.
In the preferred embodiment of the present invention, the surface spray processor system includes air compressor, gas-water separation
Device, dry sand container and sand-blasting gun, air compressor filter out swiftly flowing compressed air in air by moisture trap
Oil and water vapour, drive the abrasive material in dry sand container, spray the surface of bellows at a high speed in sand-blasting gun, generate intense impact
And friction, remove the pollutants such as dust, iron rust, spatter object and the old lumarith of bellows surface.
In the preferred embodiment of the present invention, the abrasive material in the dry sand container be it is dustless, clean, dry, have corner angle
Iron sand, quartz sand, diamond dust, one of steel sand or a variety of mixtures, particle size range should be 0.5mm~1.5mm.
In the preferred embodiment of the present invention, when sand-blasting gun sprays, injection direction should be consistent with natural wind direction, sand-blasting gun
It is in 70 ° or so of angle with workpiece surface, apart from 10~15cm of workpiece.
In the preferred embodiment of the present invention, it is described apply spray paint before, steel brush and vacuum cleaner should be used to remove residual
Stay the sundries such as sand grains.
In the preferred embodiment of the present invention, the coating spraying first sprays epoxy powder coating in bellows surface,
Its step is to heat bellows, epoxide powder coating is sprayed to bellows surface using electrostatic painting process, in bellows
At a high temperature of epoxide powder coating fusing, solidify and formed epoxy powder coating, the epoxy powder coating with a thickness of 300-
500um。
In the preferred embodiment of the present invention, after spraying epoxy powder coating in the coating spraying, in epoxy powder
Gelatinization stage spraying polyethylene and thermosol composite powder again in epoxy powder coating form polyethylene and hot melt gluing
Agent composite powder coatings, then residual temperature solidification, natural cooling, the thickness of the polyethylene and thermosol composite powder coatings
For 2-4mm.
In the preferred embodiment of the present invention, the preparation method of the polyethylene and thermosol composite powder is to incite somebody to action
Polyethylene particle and the thermosol ratio of 10:1 in mass ratio are sufficiently mixed, and are formed mixture, are fed the mixture into
After cooling, particulate material addition grinder is pulverized for extruder extruding pelletization.
In the preferred embodiment of the present invention, when in air relative humidity be more than 85%, ambient air temperature lower than 5 DEG C and steel
When material surface temperature is lower than 3 DEG C below atmospheric dew point, surface spray treatment must not be carried out.
Compared with prior art, the beneficial effects of the present invention are:
(1) the pretreated workflow of the application specification, specifies pretreated Passing Criteria, increases bellows
Surface area between epoxy powder coating increases bonding force with epoxy powder coating；
(2) compared with the polyethylene anticorrosion coating of common three-decker carrys out the production technology of corrosion-resistant steel pipe, reduce
Thermosol and polyethylene extrusion equipment, reduce the processing step of anticorrosion with painting material；With simple epoxide powder coating
Layer does not need reheating and increases power consumption, also increase the thickness of anti-corrosion material, mention compared with polyethylene powder coating layer
High anti-corrosion effect, improves the durability degree of bellows.
Detailed description of the invention
Fig. 1 is a kind of flow chart for one preferred embodiment of method for promoting bellows durability degree of the application.
Specific embodiment
Below in conjunction with drawings and examples, the present invention will be described in further detail.It should be appreciated that described herein
Specific examples are only used to explain the present invention, is not intended to limit the present invention.
Embodiment 1:
Fig. 1 is please referred to, is an a kind of preferred embodiment of the method for promoting bellows durability degree of the present invention, a kind of promotion wave
The method of line pipe durability degree, which is characterized in that the steps include:
S1 carries out surface spray treatment to bellows；
S2 checks treatment effect；
The preparation of S3 polyethylene and thermosol composite powder；
The spraying of S4 epoxy powder；
The spraying of S5 polyethylene and thermosol composite powder；
S6 cooling and solidifying.
In the present embodiment, before the spray treatment of surface, the dirts such as slag, burr, grease that cut of bellows surfaces externally and internally are used
Either manually or mechanically cleaning method is removed clean, and bellows surface is avoided to have the spraying effect of pollution effect anticorrosive paint.
In the present embodiment, the surface spray processor system include air compressor, moisture trap, dry sand container and
Sand-blasting gun, air compressor filter out oil and water vapour in air by swiftly flowing compressed air, by moisture trap,
The abrasive material in dry sand container is driven, sprays the surface of bellows at a high speed in sand-blasting gun, generates intense impact and friction, removes wave
The pollutants such as dust, iron rust, spatter object and the old lumarith of line pipe surface.
In the present embodiment, the abrasive material in the dry sand container is dustless, clean, dry, to have corner angle iron sand, quartz
One of sand, diamond dust, steel sand or a variety of mixtures, particle size range should be 0.5mm~1.5mm.
In the present embodiment, when sand-blasting gun sprays, injection direction should be consistent with natural wind direction, and sand-blasting gun is in workpiece surface
70 ° or so of angle, apart from 10~15cm of workpiece.
In the present embodiment, it is described apply spray paint before, steel brush and vacuum cleaner should be used to remove the sundries such as residual sand grains.
In the present embodiment, when to be more than 85%, ambient air temperature low with steel surface temperature lower than 5 DEG C for relative humidity in air
Below atmospheric dew point at 3 DEG C, surface spray treatment must not be carried out.
In the present embodiment, the coating spraying first sprays epoxy powder coating in bellows surface, and step is by wave
Epoxide powder coating is sprayed to bellows surface using electrostatic painting process, epoxy at a high temperature of bellows by line Guan Jiare
Powdery paints fusing solidifies and is formed epoxy powder coating, the epoxy powder coating with a thickness of 300-500um.
In the present embodiment, after spraying epoxy powder coating in the coating spraying, in the epoxy powder gelatinization stage in ring
Spraying polyethylene and thermosol composite powder, formation polyethylene and thermosol composite powder apply again on oxygen powder coating
Layer, then using residual temperature solidification, natural cooling, the polyethylene and thermosol composite powder coatings with a thickness of 2-4mm.
In the present embodiment, the preparation method of the polyethylene and thermosol composite powder be by polyethylene particle with
The thermosol ratio of 10:1 in mass ratio is sufficiently mixed, and mixture is formed, and is fed the mixture into extruder extrusion and is made
After cooling, particulate material addition grinder is pulverized for grain.
In the present embodiment, after two layers of anticorrosive paint spraying operation is completed, quality examination, inspection are carried out to spraying operation
It is spare to look into qualified ability.Quality examination content see the table below:
Embodiment 2:
The present embodiment is specially bellows surface spray treatment, that is, the pretreatment before painting.
Pretreatment includes processing, mechanical treatment, flame treatment, chemical treatment, spray treatment by hand before bellows spray painting
Deng.It generally uses based on spray treatment, other methods are auxiliary treatment process.Spray treatment is the high velocity stream by compressed air
It is dynamic, iron (steel) sand (ball) abrasive grain high speed injection bellows surface is driven, intense impact and friction are generated, to remove metal surface
The various pollutants such as dust, iron rust, spatter object and old lumarith a kind of construction technology.Spray processor system needs
Want the equipment such as air compressor, moisture trap, dry sand container, sand-blasting gun.It is quartz sand, Buddha's warrior attendant used in blasting treatment
The angulars abrasive material such as sand, iron sand, steel sand.
It should be noted when bellows surface spray treatment, before surface preparation, bellows surfaces externally and internally cut into slag, hair
The dirts such as thorn, grease are by hand or mechanical sweeper method is removed completely.
Surface spray treatment should use iron sand that is dustless, clean, dry, having corner angle, abrasive grain range should be 0.5mm~
1.5mm unanimously uses granularity for the abrasive material of 1mm in some preferred embodiments, and such spray treatment is more evenly；Injection is used
Compressed air need to filter, except deoil, water.
When injection, injection direction should be consistent with natural wind direction, and spray gun and workpiece surface are in 70 ° or so of angle, apart from work
10~15cm of part is advisable.
When in air relative humidity be more than 85%, ambient air temperature lower than 5 DEG C and steel surface temperature lower than atmospheric dew point with
At lower 3 DEG C, surface spray treatment must not be carried out.
The objects such as Ying Zaiyu manpower do not contact on surface after spary, prevent from polluting once again.Before applying spray paint, steel brush should be used
The sundries such as residual sand grains are removed with vacuum cleaner.Operating personnel should clear up with fiber glove if hand is not used with caution and touches
Surface should use solvent clean the surface immediately.
When surface quality is checked and accepted, bellows surface handles quality acceptance standard according to design Corrosion prevention scheme to determine, generally
Regulation are as follows: bright pipe, pipe laying inner surface treatment grade should reach Sa2.5 as defined in standard grades；Its inside surface roughness numerical value and painting
Expect related: Ry40 μm~Ry70 μm should be reached in conventional anticorrosive paint, thick-slurry type anticorrosive paint or metal thermal spraying should reach
Ry60 μm~Ry100 μm.
Bright pipe outer wall (coating spraying) processing grade should reach Sa2.5 as defined in standard grades, and surface roughness value should reach
To Ry40 μm~Ry70 μm.
Bellows surface handles grade photo visual evaluation, and the requirement content of each grade see the table below.
Steel handle classification standard
Embodiment 3:
The present embodiment is specially the spraying of the anticorrosive paint of bellows, is included the following steps:
S1, surface spray treatment is carried out to bellows；
S2, treatment effect is checked；
The preparation of S3, polyethylene and thermosol composite powder: polyethylene particle and thermosol particle are pressed into matter
It measures the ratio than 10:1 to be sufficiently mixed, and forms mixture；Extruder extruding pelletization is fed the mixture into, and forms particle
Material；The particulate material of extruder manufacture is subjected to cooling treatment, specifically can carry out cooling treatment by the way of freezing；Then will
Particulate material is added grinder and is milled, and polyethylene and thermosol composite powder is made；
The spraying of S4, epoxy powder: bellows after overspray pre-processes, using medium frequency induction heater to bellows into
Row heating, continues 1 hour by 40-60 DEG C of temperature, to exclude the moisture inside and outside bellows, then using heating generator to ripple
Pipe is heated again, and after reaching 100-200 DEG C, epoxy powder is sprayed to bellows surface using electrostatic painting process, benefit
Epoxide powder coating is melted with the high temperature of bellows, solidifies in bellows surface and forms epoxy powder coating；
The spraying of S5, polyethylene and thermosol composite powder: in the epoxy powder gelatinization stage, by polyethylene and hot melt
Adhesive composite powder is coated to the outside of epoxy powder coating in S2, and forms polyethylene and the painting of thermosol composite powder
Layer；
S6, cooling and solidifying: solidified using residual temperature, naturally cool to room temperature.
Compared with prior art, the beneficial effects of the present invention are:
(1) the pretreated workflow of the application specification, specifies pretreated Passing Criteria, increases bellows
Surface area between epoxy powder coating, the bonding force for increasing bellows and epoxy powder coating；
(2) compared with the polyethylene anticorrosion coating of common three-decker carrys out the production technology of corrosion-resistant steel pipe, reduce
Thermosol and polyethylene extrusion equipment, reduce the processing step of anticorrosion with painting material；With simple epoxide powder coating
Layer does not need reheating and increases power consumption, also increase the thickness of anti-corrosion material, mention compared with polyethylene powder coating layer
High anti-corrosion effect, improves the durability degree of bellows.
The preferred embodiment of the present invention has shown and described in above description, as previously described, it should be understood that the present invention is not office
Be limited to form disclosed herein, should not be regarded as an exclusion of other examples, and can be used for various other combinations, modification and
Environment, and can be changed within that scope of the inventive concept describe herein by the above teachings or related fields of technology or knowledge
It is dynamic.And changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, then it all should be appended by the present invention
In scope of protection of the claims.
Claims (10)
1. a kind of method for promoting bellows durability degree, which is characterized in that the steps include:
S1 carries out surface spray treatment to bellows；
S2 checks treatment effect；
The preparation of S3 polyethylene and thermosol composite powder；
The spraying of S4 epoxy powder；
The spraying of S5 polyethylene and thermosol composite powder；
S6 cooling and solidifying.
2. a kind of method for promoting bellows durability degree according to claim 1, it is characterised in that: surface spray treatment
Before, by bellows surfaces externally and internally cut the dirts such as slag, burr, grease by hand or mechanical sweeper method remove it is clean.
3. a kind of method for promoting bellows durability degree according to claim 1, it is characterised in that: at the surface injection
Reason system includes air compressor, moisture trap, dry sand container and sand-blasting gun, and air compressor is empty by swiftly flowing compression
Gas filters out oil and water vapour in air by moisture trap, drives the abrasive material in dry sand container, the high speed in sand-blasting gun
Spray the surface of bellows, generate intense impact and friction, remove the dust of bellows surface, iron rust, spatter object and
The pollutants such as old lumarith.
4. a kind of method for promoting bellows durability degree according to claim 1, it is characterised in that: in the dry sand container
Abrasive material be one of dustless, clean, dry, the iron sand that has corner angle, quartz sand, diamond dust, steel sand or a variety of mixtures, grain
Degree range should be 0.5mm~1.5mm.
5. a kind of method for promoting bellows durability degree according to claim 1, it is characterised in that: when sand-blasting gun sprays,
Injection direction should be consistent with natural wind direction, and sand-blasting gun and workpiece surface are in 70 ° or so of angle, apart from 10~15cm of workpiece.
6. a kind of method for promoting bellows durability degree according to claim 1, it is characterised in that: described to apply spray paint
Before, steel brush and vacuum cleaner should be used to remove the sundries such as residual sand grains.
7. a kind of method for promoting bellows durability degree according to claim 1, it is characterised in that: the coating spraying is first
Epoxy powder coating is sprayed in bellows surface, step is to heat bellows, using electrostatic painting process by epoxy powder
Coating sprays to bellows surface, and epoxide powder coating melts, solidifies and formed epoxy powder coating at a high temperature of bellows,
The epoxy powder coating with a thickness of 300-500um.
8. a kind of method for promoting bellows durability degree according to claim 1, it is characterised in that: in the coating spraying
After spraying epoxy powder coating, in the epoxy powder gelatinization stage in epoxy powder coating spraying polyethylene and thermosol again
Composite powder forms polyethylene and thermosol composite powder coatings, then residual temperature solidification, natural cooling, the polyethylene
With thermosol composite powder coatings with a thickness of 2-4mm.
9. a kind of method for promoting bellows durability degree according to claim 1, it is characterised in that: the polyethylene and heat
The preparation method of molten adhesive composite powder is to fill polyethylene particle and the thermosol ratio of 10:1 in mass ratio
Divide mixing, form mixture, feed the mixture into extruder extruding pelletization, after cooling, particulate material addition grinder is ground into
Powder.
10. a kind of method for promoting bellows durability degree according to claim 1, it is characterised in that: when opposite in air
Humidity is more than 85%, ambient air temperature lower than 5 DEG C and when steel surface temperature is lower than 3 DEG C below atmospheric dew point, must not carry out surface
Spray treatment.
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| CN201811600793.5A CN109465164A (en) | 2018-12-26 | 2018-12-26 | A method of promoting bellows durability degree |
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| CN201811600793.5A CN109465164A (en) | 2018-12-26 | 2018-12-26 | A method of promoting bellows durability degree |
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Citations (4)
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|---|---|---|---|---|
| JPS62148585A (en) * | 1985-12-24 | 1987-07-02 | Kawasaki Steel Corp | Adhesive having improved salt water resistance |
| CN101643634A (en) * | 2008-08-05 | 2010-02-10 | 上海海隆赛能新材料有限公司 | Polyethylene glue nucleation melting-boosting adhesive special for oil and gas pipelines |
| CN102518911A (en) * | 2011-12-28 | 2012-06-27 | 广州鹿山新材料股份有限公司 | Anticorrosion method for high-efficiency energy-saving large-aperture steel pipes and metal components |
| CN107685411A (en) * | 2017-10-13 | 2018-02-13 | 甘肃天和力德管道制造有限公司 | A kind of anti-corrosive steel tube and its manufacturing process |
-
2018
- 2018-12-26 CN CN201811600793.5A patent/CN109465164A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62148585A (en) * | 1985-12-24 | 1987-07-02 | Kawasaki Steel Corp | Adhesive having improved salt water resistance |
| CN101643634A (en) * | 2008-08-05 | 2010-02-10 | 上海海隆赛能新材料有限公司 | Polyethylene glue nucleation melting-boosting adhesive special for oil and gas pipelines |
| CN102518911A (en) * | 2011-12-28 | 2012-06-27 | 广州鹿山新材料股份有限公司 | Anticorrosion method for high-efficiency energy-saving large-aperture steel pipes and metal components |
| CN107685411A (en) * | 2017-10-13 | 2018-02-13 | 甘肃天和力德管道制造有限公司 | A kind of anti-corrosive steel tube and its manufacturing process |
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| Title |
|---|
| 《自来水笔制造工艺》编写组: "《自来水笔制造工艺》", 31 July 1988, 轻工业出版社 * |
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