CN109465159A - A kind of plastic coating method and plastic-coated device - Google Patents
A kind of plastic coating method and plastic-coated device Download PDFInfo
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- CN109465159A CN109465159A CN201811233972.XA CN201811233972A CN109465159A CN 109465159 A CN109465159 A CN 109465159A CN 201811233972 A CN201811233972 A CN 201811233972A CN 109465159 A CN109465159 A CN 109465159A
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- steel pipe
- plastic
- coating method
- plastic coating
- coated
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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
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/04—Apparatus specially adapted for applying particulate materials to surfaces the particulate material being projected, poured or allowed to flow onto the surface of the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C13/00—Means for manipulating or holding work, e.g. for separate articles
- B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/005—Apparatus specially designed for applying particulate materials to the inside of hollow work
- B05C19/007—Apparatus specially designed for applying particulate materials to the inside of hollow work for applying the particulate materials to the inside of hollow tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
- B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
-
- 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
- B05D3/02—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 baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
This application involves a kind of plastic coating method and plastic-coated devices, and in particular to a kind of plastic-coated device and plastic coating method of the inner wall plastic-spraying of steel pipe belong to steel pipe application techniques field.The plastic coating method, to the inner wall of plastic-coated steel, which includes: to provide a heating device, and wherein the heating device can realize rotation and heating to steel pipe；An injection apparatus is provided, wherein molding powder can be sprayed into steel pipe by the injection apparatus；Placing steel tubes are in heating device, the heating device gradient-heated steel pipe to predetermined temperature, which sprays into molding powder in the rotating steel tube of predetermined temperature, which melts in steel pipe and be spin-coated on steel pipe inner wall.The coating uniform of the coating for inner wall of the steel pipe of this method preparation, high degree of automation, operating expenses is low, high financial profit, and method is simple.
Description
Technical field
This application involves a kind of plastic coating method and plastic-coated devices, and in particular to a kind of plastic-coated device of the inner wall plastic-spraying of steel pipe
And plastic coating method, belong to steel pipe application techniques field.
Background technique
Currently, plastic-coated steel is a kind of novel efficient corrosion resisting steel, have antiseptic property excellent, compressive resistance is high, makes
It is long with the service life, the features such as inner surface is smooth, and liquid flow properties are good, it is made to obtain the approval in market rapidly.It is domestic at present to apply
The production method of Plastic Steel Pipe substantially has eight kinds: 1. electrostatic spray；2. extrusion cladding method；3. force feed cladding process；4. curtain-type applies
Cover method；5. spin coating method；6. flowing groove cladding process；7. flame spraying；8. negative pressure method；This eight kinds of coating methods all respectively have excellent
Point and be suitable for coating range.Steel pipe includes small-caliber steel pipe and large-diameter steel pipe, and small-caliber steel pipe refers to that bore is 15~50mm
Steel pipe.
Electrostatic spray is suitble to the plastic-coated of minor diameter pipe or major diameter short tube and pipe fitting；Flame spraying is not suitable for elongated
The internal plastic coating of pipe；Extrusion cladding method is a kind of pipe plastic coating method generallyd use, generally uses thermoplastic such as polyethylene
Grain plastic, fusing forms jet flow plastics in the machine of spraying, and sprays bead and is heated to certain temperature (generally
230 DEG C~320 DEG C) steel pipe walls on, form certain thickness film, coat steel pipe and plastic-coated steel is made, be only suitable for steel pipe
Outer surface plastic-coated cannot make interior painting.
Flowing groove cladding process is also referred to as fluidized bed process, is to have opening, bottom to be connected with drying compressed air (0.6 on a top
~1MPa) container in, compressed air is pressed through equalizing press layer, will be placed on above air permeable plate using a porous breathable plate
Plastic powders blow out the boiling-like of flowing, are allowed to float up to 20% and the atomization that suspends, and then would be heated to certain temperature (by being applied
The performance requirement of molding powder) steel pipe be put into the atomization molding powder slot (flowing groove) in flow regime, molding powder is by uniform melt and glues
Invest in hot steel pipe walls, be more suited to pipe fitting, shape tube and minor-diameter steel-tube inside and outside painting and outer painting (blocking nozzle with baffle),
No matter the steel pipe of what shape, interior painting or shallow layer (0.3~0.5mm of film thickness) are done if required nothing more than, flowing groove cladding process is just
It is not applicable.
It is that funnel is adjusted by being mounted on a row on rotating steel tube top that curtain, which spreads cladding process, is in curtain shape by molding powder
It is uniformly dispersed on the outer wall of steel pipe heated, due to the rotation of steel pipe, the molding powder for being sprinkling upon thereon will be melted in appearance
On face, required painting plastic film is formed.This method suitable for larger diameter straight tube outer surface plastic-coated, as curtain spread coating
Method.Curtain distribution coating machine is the surfaces externally and internally coating exclusively for straight tube (including with flange straight tube) and the equipment of design.Generally
For, the diameter of coating steel pipes should be greater than 76mm (3in), 3~12m of length.
Spin coating method is a kind of simplest pipe plastic coating method, is only applicable to coat flanged (FLGD) elbow, bend pipe, band
The inner surface of the pipe fittings such as elbow, the threeway reducer pipe of straight tube.Molding powder is packed into pipe fitting in implementing coating procedure, pipe fitting is with painting
Coating equipment positive and negative rotation convolution, that is, rotate forward 3 weekly reversal 3 weeks, and the pipe fitting contact for enabling molding powder and having heated is uniform, and it is consistent to obtain thickness
Inner coating, the plastic coating method of this coating pipes inner surface is spin coating method.
It is existing more using force feed cladding process and suction powder spraying for small-caliber steel pipe.Force feed cladding process is to use
Clean compressed air is sent to molding powder in the steel pipe heated, makes to fill molding powder in steel pipe, when the heated steel for filling molding powder
After the decline of tube temperature degree, the extra molding powder not being melted in steel pipe walls is blown out with compressed air.To prevent plastic powders from blocking back
Closed tube road, just fills upper hertz oscilltor in molding powder reclaiming device and molding powder filter, force feed cladding process are only applicable to elongate steel
The interior painting of pipe.
Powder spraying is inhaled uniformly to be painted on well in the powder sucking steel pipe in powder supply case on steel pipe inner wall by device for inhaling powdery substances,
It is equipped with powder supply valve in steel pipe arrival end, is equipped in the outlet end of steel pipe and inhales powder valve, but above structure is inhaling powder coating
Cheng Zhong still has following defect, first is that closing powder supply valve after dusting, device for inhaling powdery substances continues to draw a period of time for steel
Remaining powder is absorbed in pipe, at this point, current path is obstructed, the gap between powder supply pipeline and steel pipe can only be leaned on to supply, cause steel in this way
Remaining powder discharge is unsmooth in pipe, causes dusting uneven, when being sprayed especially with epoxy powder, since it is than great, airflow channel by
When resistance, it will lead to powder and fall on steel pipe inner wall, and then seriously affect the uniformity and stability of spraying.Second is that spraying starts
When, device for inhaling powdery substances not yet sets up stable atmospheric pressure state, at this moment if open powder supply valve and inhale powder valve, due to air pressure compared with
It is small and unstable, it is also possible to coating quality be caused to decline.
Summary of the invention
To solve the above-mentioned problems, present applicant proposes a kind of plastic coating method, the coating for inner wall of the steel pipe of this method preparation
Coating uniform, high degree of automation, operating expenses is low, high financial profit, and method is simple.Especially have in small-bore spraying aobvious
The advantage of work.
Inner wall of the plastic coating method to plastic-coated steel, the plastic coating method include: to provide a heating device, the wherein heating
Device can realize rotation and heating to steel pipe；An injection apparatus is provided, wherein molding powder can be sprayed into steel pipe by the injection apparatus；It puts
Steel pipe is set in heating device, molding powder is sprayed into predetermined temperature by the heating devices heat steel pipe to predetermined temperature, the injection apparatus
Rotating steel tube in, which melts in steel pipe and is spin-coated on steel pipe inner wall.
Optionally, the predetermined temperature of the steel pipe is 180-260 DEG C.Preferably, the predetermined temperature of the steel pipe is 180
℃-220℃.It is highly preferred that the predetermined temperature of the steel pipe is 190 DEG C -220 DEG C.
Optionally, the rotation speed of the steel pipe is that 70-100 turns/min.Preferably, the rotation speed of the steel pipe is
80-90 turns/min.
Optionally, the flow velocity of the lance ejection coating is 400-600g/min.Preferably, the lance ejection coating
Flow velocity is 500g/min.
Optionally, the ratio of the range of the pipeline and the spray gun is 6:6.7-7.Preferably, the pipeline with it is described
The ratio of the range of spray gun is 6:7.As an implementation, the pipeline is 6m, and the range of the spray gun is 6.7-7m.Make
For another embodiment, as an implementation, the pipeline is 6m, and the range of the spray gun is 7m.
Optionally, the distance of the coating material outlet of the spray gun to the end face of pipeline is 2-5mm.
Optionally, which is epoxy powder, and the partial size of the epoxy powder is 100-120 mesh, and density is
1.4-1.5g/cm3。
Optionally, the ratio of the exit caliber of the bore and injection apparatus of the steel pipe is 1.2-2:1.
Optionally, which can realize rotation and heating to steel pipe, which can realize the temperature of steel pipe
It is raised and lowered along the extending direction of steel pipe.
According to the another aspect of the application, plastic-coated device used in any of the above-described kind of plastic coating method of one kind is provided,
It is characterized in that, including heating device and injection apparatus,
The heating device, including heating mechanism and the rotating mechanism that is arranged in inside heating mechanism, the wherein heating mechanism
The heating to steel pipe can be achieved；
The rotating mechanism can drive steel pipe to rotate；
Molding powder can be sprayed into steel pipe by injection apparatus, the injection apparatus, which melts in hot steel pipe and be spin-coated on steel pipe
Inner wall.
Optionally, the heating device should wherein add including heating mechanism and the rotating mechanism being arranged in inside heating mechanism
Heat engine structure can realize the gradient-heated to steel pipe, which can realize that the temperature of steel pipe is increased along the extending direction of steel pipe
Or it reduces；The rotating mechanism can drive steel pipe to rotate.As an implementation, the predetermined temperature of small-caliber steel pipe is with separate
Injection entrance and be decreased slightly as low, the coating of small-caliber steel pipe is more uniform.
As an implementation, the coating layer of the inner wall of the small-caliber steel pipe is epoxy resin layer, and epoxy resin applies
The thickness for moulding layer is more than or equal to 0.3mm.
The beneficial effect that the application can generate includes but is not limited to:
1. plastic coating method provided herein is simple, high degree of automation, operating expenses is low, high financial profit, the party
The inner wall of the steel pipe of method preparation uniformly, one-pass molding, erosion resistance and corrosion-resistant.
2. plastic-coated device structure provided herein is simple, high degree of automation is easy to operate, is easy to control, especially
It is complicated to solve small-bore spraying, the problem of uniformity difference.
Specific embodiment
The application is described in detail below with reference to embodiment, but the application is not limited to these embodiments.
Unless otherwise instructed, the raw material in embodiments herein and catalyst are bought by commercial sources, wherein ring
Oxygen toner is purchased from Shanghai Wei Yang company, and the partial size of WHITE10-2001 model is 100-120 mesh；Steel pipe is reached purchased from Tianjin benefit
Material Q235B, the DN15-DN600 model of company；Heating furnace is purchased from electronic long company, Meishan, changxing, zhejiang Province Xingda, power 56/
30KW；Spray gun is purchased from forest zone Xin Nuo coating Co., Ltd.
According to a kind of embodiment of the application, a kind of plastic coating method of the inner wall of small-caliber steel pipe includes:
1) phosphorating treatment or bead are done to small-caliber steel pipe surface；
2) small-caliber steel pipe is placed in heating furnace, and preset temperature is heated to small-caliber steel pipe in heating furnace；
3) epoxy powder in spray gun is sprayed into the hot steel pipe of rotation, after small-caliber steel pipe spin for some time,
Epoxy powder melts in small-caliber steel pipe and is spin-coated on steel pipe inner wall, and extra epoxy powder is blown out；
4) steel pipe of spin-on epoxy powder is cooling.
The pretreatment on 1 small-caliber steel pipe surface of embodiment
Surface preparation, treatment process are as follows: small-caliber steel pipe sample is put into 5%-7%'s are carried out to small-caliber steel pipe
30 minutes are impregnated in NaOH solution to remove the remaining greasy dirt of matrix surface and other pollutants；After cleaned drying, carry out
Sandblasting roughening treatment, it is desirable that surface to be painted is in uniform silvery white.Sandblasting parameter is as shown in table 1.
1 blasting craft parameter of table
| Material | Granularity | Gas | Air pressure | Sandblasting distance | Blast time | Blast time |
| Brown Alundum | 16 mesh | Compressed air | 0.8~0.9MPa | 100~150m | 70~80 ° | 30~4s |
The plastic-spraying of 2 small-caliber steel pipe of embodiment
The pretreated small-caliber steel pipe of embodiment 1 will be passed through, carry out plastic-spraying processing, steps are as follows for plastic-spraying:
1) it will be placed in heating furnace by pretreated small-caliber steel pipe, small-caliber steel pipe gradient will be added in heating furnace
Heat is to preset temperature；
2) epoxy powder in spray gun is sprayed into the steel pipe of rotation, the outlet of spray gun and small-caliber steel pipe are close to spray
It penetrates, after small-caliber steel pipe spin for some time, epoxy powder melts in small-caliber steel pipe and is spin-coated on steel pipe inner wall extremely
Epoxy coating with a thickness of extra epoxy powder is blown out；
3) steel pipe of spin-on epoxy powder is cooled.
With the long 6m of small-caliber steel pipe, bore 30mm, sample coatings are with a thickness of being illustrated plastic-coated steel for 0.4mm
Preparation process, specific epoxy powder parameter and spray gun plastic-coated experiment condition, pipe plastic coating condition, steel pipe and injection apparatus
Relative aperture experiment condition it is as shown in table 2, plastic-coated steel sample 1-5, plastic-coated steel contrast sample 1-3 are prepared respectively.
Table 2
Appearance Visual: sample 1-5 is without bulge, smooth, smooth, no sag；Contrast sample 1 has sagging, and contrast sample 2 has not
It is smooth, 3 out-of-flatness of contrast sample.
The stretching of the liner of 3 small-caliber steel pipe plastic-spraying of embodiment detects
Bond strength test mating plate tension test method referring to specified in GB/T 8642-2002, it is omnipotent in WE-100 type
It is carried out on testing machine.The method is to stretch coating vertically applying pulling force with the direction of matrix surface, shell it from matrix surface
From examining the binding ability of coating and matrix or coat inside with this, when test should keep vertically being loaded into.According to sample fracture position
It sets, it can be determined that bond strength type.
The results are shown in Table 3 for the bond strength of stripping method observational measurement high-density polyethylene ene coatings.
3 coating stripping test result of table
The pin hole experiment of the liner of 4 small-caliber steel pipe plastic-spraying of embodiment, flattens experiment at crooked experiment
According to standard CJ/T 120-2008, pin hole experiment, the detection of plastic-coated steel inner face electricity consumption Spark plug optical fiber sensor instrument, sample are carried out
Product 1-5 is generated without electric spark, and contrast sample 1-3 generates electric spark.According to standard CJ/T120-2008, it is real to carry out bending
It tests, sample 1-5 inner coating flawless and removing occur, and contrast sample 1-3 cracks and remove appearance.According to standard CJ/T
120-2008 carries out flattening experiment, and sample 1-5 inner coating flawless and removing occur, and contrast sample 1-3 is cracked and removed
Occur.
The above is only several embodiments of the application, not does any type of limitation to the application, although this Shen
Please disclosed as above with preferred embodiment, however not to limit the application, any person skilled in the art is not taking off
In the range of technical scheme, a little variation or modification are made using the technology contents of the disclosure above and is equal to
Case study on implementation is imitated, is belonged in technical proposal scope.
Claims (10)
1. a kind of plastic coating method, to the inner wall of plastic-coated steel, which includes:
A heating device is provided, wherein the heating device can realize rotation and heating to steel pipe；
An injection apparatus is provided, wherein molding powder can be sprayed into steel pipe by the injection apparatus；
Placing steel tubes are in heating device, the heating devices heat steel pipe to predetermined temperature, which sprays into molding powder pre-
Determine in the rotating steel tube of temperature, which melts in steel pipe and be spin-coated on steel pipe inner wall.
2. plastic coating method according to claim 1, which is characterized in that the predetermined temperature of the steel pipe is 180-260 DEG C；It is excellent
Selection of land, the predetermined temperature of the steel pipe are 180 DEG C -220 DEG C.
3. plastic coating method according to claim 1, which is characterized in that the rotation speed of the steel pipe be 70-100 turn/
min；Preferably, the rotation speed of the steel pipe is that 80-90 turns/min.
4. plastic coating method according to claim 1, which is characterized in that the flow velocity of the lance ejection coating is 400-
600g/min；Preferably, the flow velocity of the lance ejection coating is 500g/min.
5. plastic coating method according to claim 1, which is characterized in that the ratio of the pipeline and the range of the spray gun is
6:6.7-7；Preferably, the ratio of the range of the pipeline and the spray gun is 6:7.
6. plastic coating method according to claim 1, which is characterized in that the end face of the coating material outlet of the spray gun to pipeline
Distance is 2-5mm.
7. plastic coating method according to claim 1, which is characterized in that the molding powder is epoxy powder, the epoxy resin
The partial size of powder is 100-120 mesh, density 1.4-1.5g/cm3。
8. plastic coating method according to claim 1, which is characterized in that the bore of the steel pipe and the outlet mouth of the injection apparatus
The ratio of diameter is 1.2-2:1.
9. plastic coating method according to claim 1, which is characterized in that the heating device can realize rotation to steel pipe and add
Heat, the gradient-heated can realize that the temperature of steel pipe is raised and lowered along the extending direction of steel pipe.
10. plastic-coated device used in any plastic coating method in claim 1 to 9, which is characterized in that including heating device and
Injection apparatus,
The heating device, including heating mechanism and the rotating mechanism being arranged in inside heating mechanism, wherein the heating mechanism can be real
Now to the heating of steel pipe；
The rotating mechanism can drive steel pipe to rotate；
Molding powder can be sprayed into steel pipe by injection apparatus, the injection apparatus, which melts in hot steel pipe and be spin-coated on steel pipe inner wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811233972.XA CN109465159A (en) | 2018-10-23 | 2018-10-23 | A kind of plastic coating method and plastic-coated device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811233972.XA CN109465159A (en) | 2018-10-23 | 2018-10-23 | A kind of plastic coating method and plastic-coated device |
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| CN109465159A true CN109465159A (en) | 2019-03-15 |
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ID=65664069
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114160390A (en) * | 2021-11-19 | 2022-03-11 | 潍坊联威机械有限公司 | Production process of pipe fitting inner coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114160390A (en) * | 2021-11-19 | 2022-03-11 | 潍坊联威机械有限公司 | Production process of pipe fitting inner coating |
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