CN108187991A - A kind for the treatment of process of cock surface spraying PTFE coating - Google Patents
A kind for the treatment of process of cock surface spraying PTFE coating Download PDFInfo
- Publication number
- CN108187991A CN108187991A CN201810102281.XA CN201810102281A CN108187991A CN 108187991 A CN108187991 A CN 108187991A CN 201810102281 A CN201810102281 A CN 201810102281A CN 108187991 A CN108187991 A CN 108187991A
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- CN
- China
- Prior art keywords
- cock
- spraying
- technique according
- lye
- surfactant
- 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.)
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Classifications
-
- 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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
- B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
-
- 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
- B05D3/002—Pretreatement
-
- 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
- B05D3/007—After-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
- B05D3/10—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 other chemical 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
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
- B05D2506/15—Polytetrafluoroethylene [PTFE]
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a kind of plug valves to be surface-treated spraying PTFE coating process, it is characterised in that：It includes the following steps：(1) it is surface-treated；(2) PTFE coating, polishing are sprayed, you can.The adhesive force for the cock that the method for the present invention is prepared is high, there is no friction obscission after unlatching, while does not spray under the high temperature conditions, is not in the defects of sealing performance caused by Light deformation lowers, overcomes existing method, application prospect is very excellent.
Description
Technical field
This patent is related to valve technology field more particularly to a kind of plug valve surface treatment spraying PTFE coating process.
Background technology
The main seal pair of pressure balanced rotary piston valve is made of valve body and cock sealing surface.Because pressure balance type cock
Be mostly installed at field, it is most of to play blowdown, therefore in order to adapt to its work condition environment, valve body and cock sealing surface compared with
Wide and be metal sealing, the keying torque of valve is larger, operating difficulties.
At present, torque is reduced in order to reduce friction, the antifriction processing of spraying PTFE coating is generally carried out on the surface of cock.One
As spraying PTFE coating process be：High temperature degreasing → surface preparation → spraying → hot setting → cooling → post-processing.
However the technique is used to spray, cock can be caused Light deformation occur, and Light deformation can lead to the taper of cock and the taper of valve body
There is micro inconsistent (valve body and the taper of cock pass through grinding before spraying, and general taper is consistent), sealing performance reduces.
Meanwhile technique PTFE coating adhesion is not high, deposits the problem that is not suitable at elevated pressures, cock exists certain at the initial stage of unlatching
Coating friction obscission.
Invention content
To solve the above-mentioned problems, the present invention provides a kind of novel cock surface antifriction PTFE coating treatment techniques.
Plug valve surface treatment spraying PTFE coating process of the present invention, it includes the following steps：
(1) it is surface-treated；
(2) PTFE coating, polishing are sprayed, you can.
Polishing：Polishing refers to the effect using machinery, chemistry or electrochemistry, reduces workpiece surface roughness, to obtain
Bright, flat surface processing method.The present invention may be used conventional polishing method and be polished.
PTFE coating of the present invention can be the wear-resisting PTFE coating of Du Pont.PTFE is polytetrafluoroethylene (PTFE).
In step (1), the surface treatment includes following 4 steps：
1) cock that roughness is Ra0.6-0.8 μm is taken；
If 2) there is corrosion on cock surface, the corrosion on cock surface is removed；
3) it is put into progress de-oiling degreasing in lye；
4) sandblasting, Part Surface Roughness is Ra2.5-3.2 μm after sandblasting.
The corrosion on cock surface is removed, the conventional method for removing corrosion, such as physical removal corrosion may be used in the present invention,
Or chemistry removal corrosion.
Sandblasting：Using the percussion cleaning of high speed sand flow and the process of roughening matrix surface, obtain the surface of workpiece
Certain cleannes and different roughness.Conventional blasting method may be used in the application, only need to ensure the part after sandblasting
Surface roughness is Ra2.5-3.2 μm.
In step 3), the lye is the lye boiled.The lye is by inorganic low alkalinity auxiliary agent and surfactant
The solution of composition.In the lye, a concentration of the 1~5% of inorganic low alkalinity auxiliary agent, surfactant a concentration of 0.2~
0.3%；The inorganic low alkalinity auxiliary agent is sodium metasilicate, sodium tripolyphosphate, sodium phosphate or sodium carbonate；The surfactant is non-
Ionic and anionic surfactant, preferably polyvinyl chloride OP classes and sulfonate surfactant, most preferably dodecane
Base alkanoic acid sodium.
In step (2), the technique of the spraying PTFE coating is as follows：
A. step (1) is taken treated cock, preheating；
B. coating is shaken up, filtered；
C. surface spraying；
D. it is sintered.
In step a, the temperature of preheating is 80 DEG C.
In step c, spraying is using electrostatic spraying or without gas high pressure painting；The thickness of spraying is 15-20 μm, thickness error
It is not greater than 5 μm.
In step d, the sintering is that the cock after spraying is heated to 220 DEG C, constant temperature 40-60 minutes.
Spraying, by means of pressure or centrifugal force, is dispersed into uniform and fine droplet, is applied over the application on coated article surface
Method.Conventional spraying method may be used in present invention spraying, e.g., electrostatic spraying or without gas high pressure painting.
Sintering：Granular material is referred to be changed into dense body, is a traditional technical process.The present invention may be used often
The sintering method of rule.
The present invention also provides the cocks that preceding method is prepared.
The method of the present invention is by specific de-oiling degreasing method, with reference to the technique of spraying PTFE coating, such as preheating temperature, spray
Coating of good performance can be prepared in the combination of heating temperature after painting.
The cock adhesive force that the method for the present invention is prepared is high, there is no friction obscission after unlatching, while not in height
It is sprayed under the conditions of temperature, is not in the defects of sealing performance caused by Light deformation lowers, overcomes existing method, application prospect is non-
Chang Youliang.
Obviously, the above according to the present invention according to the ordinary technical knowledge and customary means of this field, is not departing from
Under the premise of the above-mentioned basic fundamental thought of the present invention, the modification, replacement or change of other diversified forms can also be made.
The specific embodiment of form by the following examples remakes further specifically the above of the present invention
It is bright.But the range that this should not be interpreted as to the above-mentioned theme of the present invention is only limitted to following example.It is all to be based on the above of the present invention
The technology realized all belongs to the scope of the present invention.
Specific embodiment
1 cock surface antifriction PTFE coating treatment techniques of the present invention of embodiment
First, treatment process
1st, surface prepares
1.1 surface roughness
The roughness on selection cock surface should reach Ra0.6-0.8 μm of cock, specifically, roughness be taken to reach Ra0.6-
Roughness is not achieved Ra0.6-0.8 μm of cock in 0.8 μm of cock, and grinding reaches Ra0.6-0.8 μm.
1.2 derusting
Piece surface answers non-corroding phenomenon, if there is corrosion on surface, should use and mechanically or chemically remove corrosion.
1.3 de-oiling degreasings
Part should be put into the lye that boils, and (lye is made of inorganic low alkalinity auxiliary agent and surfactant, wherein inorganic low
A concentration of 1~5% (g/ml) of alkaline assistant, a concentration of 0.2~0.3% (g/ml) of surfactant；Inorganic type auxiliary agent is
Sodium metasilicate, sodium tripolyphosphate, sodium phosphate or sodium carbonate；Surfactant is neopelex) in boil 15-20 minutes into
Row de-oiling degreasing.
1.4 sandblasting
Surface sand-blasting process is carried out, Part Surface Roughness is Ra2.5-3.2 μm after sandblasting.
2nd, spraying PTFE (the wear-resisting PTFE coating of Du Pont)
A. part, which is put into baking oven, is preheated to 80 DEG C；
B. coating is shaken up, filtered；
C. surface spraying (electrostatic spraying, without gas high pressure painting etc.), even application, thickness are 15-20 μm, and thickness error is not
It obtains and is more than 5 μm；
D. it is sintered：The part sprayed is put into electric furnace and is uniformly heated to 220 DEG C, constant temperature 40-60 minutes.
E. it cools down：Air natural cooling.
3rd, subsequent processing and coating quality is checked.
Workpiece from spray painting room is taken out, is processed by shot blasting, you can.
Visual examination mainly includes：Part sprayed surface must not have overlap, recess, drip, blank, bubble, decortication, stripping
It falls, discoloration.
2nd, nature examination
By detection, the coating performance for the cock that the method for the present invention is prepared is as follows：
The property of coating of the present invention is as follows：
Its coating layer thickness：By ASTM D1186,15-20 μm
Coating hardness：By GB/T6739-2006,4H
Coating binding force：By ASTM D3359,5B
Friction coefficient：0.05
The adhesive force for the cock that the method for the present invention is prepared is high, there is no friction obscission after unlatching, while does not exist
The defects of being sprayed under hot conditions, being not in sealing performance attenuating caused by Light deformation, overcome existing method, application prospect
It is very excellent.
Claims (10)
1. a kind of plug valve surface treatment spraying PTFE coating process, it is characterised in that：It includes the following steps：
(1) it is surface-treated；
(2) PTFE coating, polishing are sprayed, you can.
2. technique according to claim 1, it is characterised in that：In step (1), the surface treatment includes following 4 steps
Suddenly：
1) cock that roughness is Ra0.6-0.8 μm is taken；
If 2) there is corrosion on cock surface, the corrosion on cock surface is removed；
3) it is put into progress de-oiling degreasing in lye；
4) sandblasting, Part Surface Roughness is Ra2.5-3.2 μm after sandblasting.
3. technique according to claim 2, it is characterised in that：In step 3), the lye is the lye boiled.
4. the technique according to Claims 2 or 3, it is characterised in that：The lye is by inorganic low alkalinity auxiliary agent and surface
The solution of activating agent composition.
5. technique according to claim 4, it is characterised in that：In the lye, inorganic low alkalinity auxiliary agent a concentration of 1~
5%, a concentration of the 0.2~0.3% of surfactant；The inorganic low alkalinity auxiliary agent is sodium metasilicate, sodium tripolyphosphate, sodium phosphate
Or sodium carbonate；The surfactant is non-ionic and anionic surfactant, preferably polyvinyl chloride OP classes and sulfonic acid
Salt form surfactant, most preferably dodecyl alkanoic acid sodium.
6. technique according to claim 1, it is characterised in that：In step (2), the technique of the spraying PTFE is as follows：
A. step (1) is taken treated cock, preheating；
B. coating is shaken up, filtered；
C. surface spraying；
D. it is sintered.
7. technique according to claim 6, it is characterised in that：In step a, the temperature of preheating is 80 DEG C.
8. technique according to claim 6, it is characterised in that：In step c, the thickness of spraying is 15-20 μm, thickness error
It is not greater than 5 μm.
9. technique according to claim 6, it is characterised in that：In step d, the sintering is to heat the cock after spraying
To 220 DEG C, constant temperature 40-60 minutes.
10. the cock that claim 1~9 any one the method is prepared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810102281.XA CN108187991A (en) | 2018-02-01 | 2018-02-01 | A kind for the treatment of process of cock surface spraying PTFE coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810102281.XA CN108187991A (en) | 2018-02-01 | 2018-02-01 | A kind for the treatment of process of cock surface spraying PTFE coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108187991A true CN108187991A (en) | 2018-06-22 |
Family
ID=62591700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810102281.XA Pending CN108187991A (en) | 2018-02-01 | 2018-02-01 | A kind for the treatment of process of cock surface spraying PTFE coating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108187991A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1529065A (en) * | 2003-10-16 | 2004-09-15 | 黄仲新 | Sewing machine anti-wear lubircating-piece surface treating method |
| CN103697186A (en) * | 2013-12-16 | 2014-04-02 | 四川精控阀门制造有限公司 | Plug of pressure-balance oil seal plug valve and plug surface processing technology |
| CN106151568A (en) * | 2016-08-22 | 2016-11-23 | 雷蒙德(北京)科技股份有限公司 | Cock processing technique, cock and plug valve |
| CN106881256A (en) * | 2017-03-14 | 2017-06-23 | 蚌埠奥特压缩机有限公司 | A kind of oil-free lubrication method of bearing liner for compressor |
-
2018
- 2018-02-01 CN CN201810102281.XA patent/CN108187991A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1529065A (en) * | 2003-10-16 | 2004-09-15 | 黄仲新 | Sewing machine anti-wear lubircating-piece surface treating method |
| CN103697186A (en) * | 2013-12-16 | 2014-04-02 | 四川精控阀门制造有限公司 | Plug of pressure-balance oil seal plug valve and plug surface processing technology |
| CN106151568A (en) * | 2016-08-22 | 2016-11-23 | 雷蒙德(北京)科技股份有限公司 | Cock processing technique, cock and plug valve |
| CN106881256A (en) * | 2017-03-14 | 2017-06-23 | 蚌埠奥特压缩机有限公司 | A kind of oil-free lubrication method of bearing liner for compressor |
Non-Patent Citations (2)
| Title |
|---|
| 丁彰雄等: "《船舶机械修理工艺学》", 28 February 2013, 武汉理工大学出版社 * |
| 高志等: "《表面科学与工程》", 31 October 2006, 华东理工大学出版社 * |
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