CN115055352B - Preparation process of anti-corrosion armored thermocouple - Google Patents
Preparation process of anti-corrosion armored thermocouple Download PDFInfo
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- CN115055352B CN115055352B CN202210611657.6A CN202210611657A CN115055352B CN 115055352 B CN115055352 B CN 115055352B CN 202210611657 A CN202210611657 A CN 202210611657A CN 115055352 B CN115055352 B CN 115055352B
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- 238000005260 corrosion Methods 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 239000003973 paint Substances 0.000 claims abstract description 112
- 239000011248 coating agent Substances 0.000 claims abstract description 78
- 238000000576 coating method Methods 0.000 claims abstract description 78
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 74
- 239000010410 layer Substances 0.000 claims abstract description 74
- 239000002131 composite material Substances 0.000 claims abstract description 60
- 238000005507 spraying Methods 0.000 claims abstract description 39
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 39
- 239000010935 stainless steel Substances 0.000 claims abstract description 39
- 239000004744 fabric Substances 0.000 claims abstract description 30
- 239000003365 glass fiber Substances 0.000 claims abstract description 30
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000002356 single layer Substances 0.000 claims abstract description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 48
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 32
- 239000003822 epoxy resin Substances 0.000 claims description 30
- 229920000647 polyepoxide Polymers 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 30
- 239000003085 diluting agent Substances 0.000 claims description 28
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 24
- 239000000843 powder Substances 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 19
- 239000004952 Polyamide Substances 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 18
- 229920002647 polyamide Polymers 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 16
- 239000005995 Aluminium silicate Substances 0.000 claims description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 12
- 235000012211 aluminium silicate Nutrition 0.000 claims description 12
- 239000002270 dispersing agent Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 12
- 239000010445 mica Substances 0.000 claims description 12
- 229910052618 mica group Inorganic materials 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 239000004593 Epoxy Substances 0.000 claims description 8
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 8
- 239000002518 antifoaming agent Substances 0.000 claims description 7
- 239000002318 adhesion promoter Substances 0.000 claims description 6
- 239000012752 auxiliary agent Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 239000012046 mixed solvent Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 6
- 239000013530 defoamer Substances 0.000 claims description 5
- 239000003929 acidic solution Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 239000004814 polyurethane Substances 0.000 description 12
- 229920002635 polyurethane Polymers 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 11
- 239000000243 solution Substances 0.000 description 10
- 239000002253 acid Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- -1 steam Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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
- 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
- B05D7/14—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 to metal, e.g. car bodies
- B05D7/146—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 to metal, e.g. car bodies to metallic pipes or tubes
-
- 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
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with 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
- B05D3/002—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
- B05D3/12—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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- 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
- B05D7/56—Three layers or more
- B05D7/57—Three layers or more the last layer being a clear coat
- B05D7/574—Three layers or more the last layer being a clear coat at least some layers being let to dry at least partially before applying the next layer
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
- G01K1/10—Protective devices, e.g. casings for preventing chemical attack
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- 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
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
- B05D2202/15—Stainless steel
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2265—Oxides; Hydroxides of metals of iron
- C08K2003/2272—Ferric oxide (Fe2O3)
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Physics & Mathematics (AREA)
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- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
The application discloses a preparation process of an anti-corrosion armored thermocouple, which comprises the following steps: s1: derusting the outer surface of a stainless steel sleeve of the armored thermocouple; s2: adopting composite paint, and carrying out single-layer spraying treatment on the outer surface of the rust-removed stainless steel sleeve according to a spraying scheme; s3: after the first layer of composite coating is sprayed, wrapping a layer of glass fiber cloth on the outer surface of the stainless steel sleeve with paint, uniformly and completely coating a layer of composite coating on the surface of the glass fiber cloth, wrapping a layer of glass fiber cloth after the second layer of composite coating is dried, uniformly and completely coating a layer of composite coating on the surface, and drying the third layer of composite coating. According to the application, the graphene primer is adopted as the primer, so that the heat conduction performance is higher, and the temperature acquired by the armored thermocouple is more accurate.
Description
Technical Field
The application relates to the technical field of thermocouple corrosion prevention, in particular to a preparation process of an anti-corrosion armored thermocouple.
Background
The armoured thermocouple is used as a temperature measuring sensor, is usually matched with a temperature transmitter, a regulator, a display instrument and the like to form a process control system, and is used for directly measuring or controlling the temperatures of fluid, steam, gas medium, solid surface and the like in the range of 0-1800 ℃ in various production processes. The armoured thermocouple has many advantages of bending, high pressure resistance, quick thermal response time, firmness and durability, and the like, and is used as a sensor for measuring temperature like an industrial assembly thermocouple, and is usually matched with a display instrument, a recording instrument and an electronic regulator.
At present, an armored thermocouple for industrial temperature measurement basically uses an armored thermocouple made of a stainless steel protection tube material 316L (00 Cr17Ni14Mo 2), however, in practical application, the armored thermocouple is found to be capable of causing corrosion on the surface of a stainless steel sleeve after 1 year if being installed in a specific environment with high temperature and high humidity (the temperature is more than 200 ℃ and the humidity is more than 80%), and the stainless steel sleeve is corroded due to the fact that internal fillers absorb moisture and expand and burst after pitting corrosion occurs on the stainless steel sleeve, so that the thermocouple wire cannot be used due to short circuit faults. The reasons why the metal base material of the stainless steel sleeve armouring the thermocouple corrodes under high temperature and high humidity environment are generally two kinds: one is high temperature hot and humid corrosion, i.e., the purity of the metal substrate is not high enough, and in the liquid and humid environment of the high temperature electrolyte, galvanic effect occurs, causing electrochemical corrosion; the other is that the oxygen element oxidizes the matrix at high temperature, and after the matrix is oxidized, the oxide is continuously increased, so that the corrosion phenomena such as cracks, fractures, holes and the like of the matrix material occur.
In the prior art, the surface of the armored thermocouple is often additionally provided with an anti-corrosion coating for corrosion prevention, but the coating with good anti-corrosion performance is often poor in heat transfer performance, so that the temperature measured by the armored thermocouple is inaccurate, errors exist, and the coating with good heat transfer performance is poor in anti-corrosion performance.
Therefore, how to maintain higher heat conductivity on the basis of improving the corrosion resistance is a technical problem to be solved at present.
Disclosure of Invention
The application provides a preparation process of an anti-corrosion armored thermocouple, which is used for solving the technical problem that the anti-corrosion performance and the heat conduction performance cannot be simultaneously achieved in the prior art.
The application provides a preparation process of an anti-corrosion armored thermocouple, which comprises the following steps:
s1: derusting the outer surface of a stainless steel sleeve of the armored thermocouple;
s2: adopting composite paint, and carrying out single-layer spraying treatment on the outer surface of the rust-removed stainless steel sleeve according to a spraying scheme;
s3: after the spraying of the first layer of composite coating is finished, wrapping a layer of glass fiber cloth on the outer surface of the stainless steel sleeve with paint, uniformly and completely coating a second layer of composite coating on the surface of the glass fiber cloth, wrapping a layer of glass fiber cloth after the second layer of composite coating is dried, uniformly and completely coating a third layer of composite coating on the surface, and drying the third layer of composite coating.
In some embodiments of the application, in the composite coating, the primer adopts graphene primer, the intermediate paint adopts epoxy cloud iron intermediate paint, and the finish paint adopts fluorocarbon finish paint;
the graphene primer comprises a component A and a component B;
the component A comprises the following components in parts by weight:
95-105 parts of epoxy resin, 95-105 parts of mica powder, 55-65 parts of iron oxide red, 440-460 parts of zinc powder, 1-8 parts of kaolin, 1-3 parts of dispersing agent, 7-12 parts of flatting agent, 6-11 parts of defoamer, 180-195 parts of graphene slurry, 13-24 parts of toluene and 30-45 parts of styrene;
the component B is 55-70 parts of modified polyamide curing agent.
In some embodiments of the application, the preparation steps of component a are as follows:
(1) Preparing graphene dispersion liquid: adding graphene powder into a diluent, wherein the graphene content is 3%, stirring for 2-2.5 hours by a high-speed mixing stirrer, and placing the uniformly dispersed graphene powder into an ultrasonic dispersing instrument for ultrasonic dispersion for 4-4.5 hours to obtain uniform black graphene dispersion liquid;
(2) Preheating epoxy resin: heating epoxy resin in an oven at 60-65deg.C for 30-35min;
(3) Preparing graphene primer: sequentially adding a defoaming agent, a dispersing agent and a leveling agent into the preheated epoxy resin, stirring for 5-6min, adding a diluent, uniformly stirring the epoxy resin and an auxiliary agent, adding a graphene dispersion liquid, dispersing for 20min, sequentially adding kaolin, iron oxide red, zinc powder and mica powder, stirring for 70min, grinding to a particle size of 60-70 mu m, and discharging for later use;
wherein the diluent is a mixed solvent of toluene and styrene.
In some embodiments of the present application, the preparation steps of the component B are as follows:
(1) Heating the modified polyamide to 90-95 ℃ in an oven, and preserving heat for 10-12min;
(2) And adding 5-11 parts of diluent and 0.15-0.20 part of adhesion promoter into 25-35 parts of modified polyamide after heat preservation, and uniformly stirring to obtain the component B.
In some embodiments of the application, the graphene primer is obtained by uniformly mixing the component A and the component B according to the proportion of 9-10:0.5-1.1 and standing for 20 min.
In some embodiments of the present application, in step S2, the spraying scheme is as follows:
adopting air spraying, selecting 2.0 spray guns for primer and intermediate paint, selecting 1.5 spray guns for finishing paint, controlling the viscosity of the paint to be-4 cups, wherein the real dry thickness of each primer is 30-40 mu m, the interval time of each primer is 6-12h, the real dry thickness of each intermediate paint is 60-80 mu m, the interval time of each intermediate paint is 12h, the real dry thickness of each finish is 30-40 mu m, the interval time of each finish is 6-8h, and the paint, the intermediate paint and the finishing paint are placed for 5-8d after finishing the spraying.
In some embodiments of the present application, the step S1 specifically includes:
soaking the outer surface of the stainless steel sleeve of the armored thermocouple in an acidic solution for 5-10min, taking out, and wiping.
By applying the technical scheme, the preparation process comprises the following steps of: s1: derusting the outer surface of a stainless steel sleeve of the armored thermocouple; s2: adopting composite paint, and carrying out single-layer spraying treatment on the outer surface of the rust-removed stainless steel sleeve according to a spraying scheme; s3: after the first layer of composite coating is sprayed, wrapping a layer of glass fiber cloth on the outer surface of the stainless steel sleeve with paint, uniformly and completely coating a layer of composite coating on the surface of the glass fiber cloth, wrapping a layer of glass fiber cloth after the second layer of composite coating is dried, uniformly and completely coating a layer of composite coating on the surface, and drying the third layer of composite coating. According to the application, the graphene primer is prepared, the graphene primer, the epoxy cloud iron intermediate paint and the fluorocarbon finish paint are used in combination, the graphene primer, the epoxy cloud iron intermediate paint and the fluorocarbon finish paint are sprayed on the outer surface of the stainless steel sleeve of the armored thermocouple according to a spraying scheme, and then glass fiber cloth and a composite coating are coated for a plurality of times, so that the anti-corrosion performance of the armored thermocouple is improved. The special spraying means are adopted to spray the composite coating on the outer surface of the stainless steel sleeve of the armored thermocouple, so that the corrosion resistance of the thermocouple is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic flow chart of a process for preparing an anti-corrosion armored thermocouple according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1
The embodiment of the application provides a preparation process of an anti-corrosion armored thermocouple, as shown in fig. 1, which comprises the following steps:
s1: soaking the outer surface of a stainless steel sleeve of the armored thermocouple in an acid solution for 5-10min, taking out, and wiping;
s2: the preparation of the graphene primer, wherein in the composite coating, the graphene primer is adopted as the primer, the epoxy cloud iron intermediate paint is adopted as the intermediate paint, and the fluorocarbon finish is adopted as the finish; the graphene primer comprises a component A and a component B; the component A comprises the following components in parts by weight: 95 parts of epoxy resin, 95 parts of mica powder, 55 parts of iron oxide red, 440 parts of zinc powder, 1 part of kaolin, 1 part of dispersant BYK-110,7 parts of flatting agent 446,6 parts of defoamer 052, 180 parts of graphene slurry, 13 parts of toluene and 30 parts of styrene; the component B is 55 parts of modified polyamide curing agent; the preparation steps of the component A are as follows: (1) preparing graphene dispersion liquid: adding graphene powder into a diluent, wherein the graphene content is 3%, stirring for 2 hours by a high-speed mixing stirrer, and placing the uniformly dispersed graphene powder into an ultrasonic dispersing instrument for ultrasonic dispersion for 4 hours to obtain uniform black graphene dispersion liquid; (2) preheating epoxy resin: heating epoxy resin in a 60 ℃ oven for 30min; (3) preparing graphene primer: sequentially adding a defoaming agent, a dispersing agent and a leveling agent into the preheated epoxy resin, stirring for 5min, adding a diluent, uniformly stirring the epoxy resin and an auxiliary agent, adding graphene dispersion liquid, dispersing for 20min, sequentially adding kaolin, iron oxide red, zinc powder and mica powder, stirring for 70min, grinding to the particle size of 60 mu m, and discharging for later use; wherein the diluent is a mixed solvent of toluene and styrene; the preparation steps of the component B are as follows: (1) Heating the modified polyamide to 90 ℃ in an oven, and preserving heat for 10min; (2) Adding 5 parts of diluent and 0.15 part of adhesion promoter into 25 parts of modified polyamide after heat preservation, and uniformly stirring to obtain a component B; uniformly mixing the component A and the component B according to the proportion of 9:0.5, and standing for 20min to obtain the graphene primer; the ratio of toluene to styrene in the diluent is 3:5;
the spraying scheme adopts air spraying, a 2.0 spray gun is selected for the primer and the intermediate paint, a 1.5 spray gun is selected for the finish paint, the viscosity of the paint is controlled to be-4 cups, the real dry thickness of each primer is 30 mu m, the interval time of each primer is 6h, the real dry thickness of each intermediate paint is 60 mu m, the interval time of each intermediate paint is 12h, the real dry thickness of each finish paint is 30 mu m, the interval time of each finish paint is 6h, and the paint, the intermediate paint and the finish paint are placed for 5d after the spraying is finished;
s3: after the spraying of the first layer of composite coating is finished, wrapping a layer of glass fiber cloth on the outer surface of the stainless steel sleeve with paint, uniformly and completely coating a second layer of composite coating on the surface of the glass fiber cloth, wrapping a layer of glass fiber cloth after the second layer of composite coating is dried, uniformly and completely coating a third layer of composite coating on the surface, and drying the third layer of composite coating. Only the first layer of composite coating adopts a spraying scheme, and is sprayed on the stainless steel sleeve outer tube of the armored thermocouple, and the other two layers of composite coating are directly smeared.
Example 2
The embodiment of the application provides a preparation process of an anti-corrosion armored thermocouple, as shown in fig. 1, which comprises the following steps:
s1: soaking the outer surface of a stainless steel sleeve of the armored thermocouple in an acid solution for 5-10min, taking out, and wiping;
s2: the preparation of the graphene primer, wherein in the composite coating, the graphene primer is adopted as the primer, the epoxy cloud iron intermediate paint is adopted as the intermediate paint, and the fluorocarbon finish is adopted as the finish; the graphene primer comprises a component A and a component B; the component A comprises the following components in parts by weight: 98 parts of epoxy resin, 98 parts of mica powder, 56 parts of iron oxide red, 445 parts of zinc powder, 2 parts of kaolin, 2 parts of a dispersing agent BYK-110,8 parts of a leveling agent 446,7 parts of a defoaming agent 052, 185 parts of graphene slurry, 14 parts of toluene and 32 parts of styrene; the component B is 57 parts of modified polyamide curing agent; the preparation steps of the component A are as follows: (1) preparing graphene dispersion liquid: adding graphene powder into a diluent, wherein the graphene content is 3%, stirring for 2 hours by a high-speed mixing stirrer, and placing the uniformly dispersed graphene powder into an ultrasonic dispersing instrument for ultrasonic dispersion for 4 hours to obtain uniform black graphene dispersion liquid; (2) preheating epoxy resin: heating the epoxy resin in a 63 ℃ oven for 32min; (3) preparing graphene primer: sequentially adding a defoaming agent, a dispersing agent and a leveling agent into the preheated epoxy resin, stirring for 5.5min, adding a diluent, uniformly stirring the epoxy resin and an auxiliary agent, adding a graphene dispersion liquid, dispersing for 20min, sequentially adding kaolin, iron oxide red, zinc powder and mica powder, stirring for 70min, grinding to the particle size of 60 mu m, and discharging for later use; wherein the diluent is a mixed solvent of toluene and styrene; the preparation steps of the component B are as follows: (1) Heating the modified polyamide to 90 ℃ in an oven, and preserving heat for 11min; (2) Adding 6 parts of diluent and 0.16 part of adhesion promoter into 27 parts of modified polyamide after heat preservation, and uniformly stirring to obtain a component B; uniformly mixing the component A and the component B according to the proportion of 9.1:0.6, and standing for 20min to obtain the graphene primer; the ratio of toluene to styrene in the diluent is 3:5;
the spraying scheme adopts air spraying, a 2.0 spray gun is selected for the primer and the intermediate paint, a 1.5 spray gun is selected for the finish paint, the viscosity of the paint is controlled to be-4 cups, the real dry thickness of each primer is 30 mu m, the interval time of each primer is 6h, the real dry thickness of each intermediate paint is 60 mu m, the interval time of each intermediate paint is 12h, the real dry thickness of each finish paint is 30 mu m, the interval time of each finish paint is 6h, and the paint, the intermediate paint and the finish paint are placed for 5d after the spraying is finished;
s3: after the spraying of the first layer of composite coating is finished, wrapping a layer of glass fiber cloth on the outer surface of the stainless steel sleeve with paint, uniformly and completely coating a second layer of composite coating on the surface of the glass fiber cloth, wrapping a layer of glass fiber cloth after the second layer of composite coating is dried, uniformly and completely coating a third layer of composite coating on the surface, and drying the third layer of composite coating. Only the first layer of composite coating adopts a spraying scheme, and is sprayed on the stainless steel sleeve outer tube of the armored thermocouple, and the other two layers of composite coating are directly smeared.
Example 3
The embodiment of the application provides a preparation process of an anti-corrosion armored thermocouple, as shown in fig. 1, which comprises the following steps:
s1: soaking the outer surface of a stainless steel sleeve of the armored thermocouple in an acid solution for 5-10min, taking out, and wiping;
s2: the preparation of the graphene primer, wherein in the composite coating, the graphene primer is adopted as the primer, the epoxy cloud iron intermediate paint is adopted as the intermediate paint, and the fluorocarbon finish is adopted as the finish; the graphene primer comprises a component A and a component B; the component A comprises the following components in parts by weight: 99 parts of epoxy resin, 99 parts of mica powder, 58 parts of iron oxide red, 449 parts of zinc powder, 3 parts of kaolin, 2.5 parts of dispersant BYK-110, 10 parts of flatting agent 446, 10 parts of defoamer 052, 191 parts of graphene slurry, 16 parts of toluene and 39 parts of styrene; the component B is 61 parts of modified polyamide curing agent; the preparation steps of the component A are as follows: (1) preparing graphene dispersion liquid: adding graphene powder into a diluent, wherein the graphene content is 3%, stirring for 2 hours by a high-speed mixing stirrer, and placing the uniformly dispersed graphene powder into an ultrasonic dispersing instrument for ultrasonic dispersion for 4 hours to obtain uniform black graphene dispersion liquid; (2) preheating epoxy resin: heating the epoxy resin in a 63 ℃ oven for 33min; (3) preparing graphene primer: sequentially adding a defoaming agent, a dispersing agent and a leveling agent into the preheated epoxy resin, stirring for 6min, adding a diluent, uniformly stirring the epoxy resin and an auxiliary agent, adding graphene dispersion liquid, dispersing for 20min, sequentially adding kaolin, iron oxide red, zinc powder and mica powder, stirring for 70min, grinding to the particle size of 60 mu m, and discharging for later use; wherein the diluent is a mixed solvent of toluene and styrene; the preparation steps of the component B are as follows: (1) Heating the modified polyamide to 90 ℃ in an oven, and preserving heat for 11min; (2) Adding 7 parts of diluent and 0.18 part of adhesion promoter into 29 parts of modified polyamide after heat preservation, and uniformly stirring to obtain a component B; uniformly mixing the component A and the component B according to the proportion of 9.3:0.7, and standing for 20min to obtain the graphene primer; the ratio of toluene to styrene in the diluent is 3:5;
the spraying scheme adopts air spraying, a 2.0 spray gun is selected for the primer and the intermediate paint, a 1.5 spray gun is selected for the finish paint, the viscosity of the paint is controlled to be-4 cups, the real dry thickness of each primer is 30 mu m, the interval time of each primer is 6h, the real dry thickness of each intermediate paint is 60 mu m, the interval time of each intermediate paint is 12h, the real dry thickness of each finish paint is 30 mu m, the interval time of each finish paint is 6h, and the paint, the intermediate paint and the finish paint are placed for 5d after the spraying is finished;
s3: after the spraying of the first layer of composite coating is finished, wrapping a layer of glass fiber cloth on the outer surface of the stainless steel sleeve with paint, uniformly and completely coating a second layer of composite coating on the surface of the glass fiber cloth, wrapping a layer of glass fiber cloth after the second layer of composite coating is dried, uniformly and completely coating a third layer of composite coating on the surface, and drying the third layer of composite coating. Only the first layer of composite coating adopts a spraying scheme, and is sprayed on the stainless steel sleeve outer tube of the armored thermocouple, and the other two layers of composite coating are directly smeared.
Example 4
The embodiment of the application provides a preparation process of an anti-corrosion armored thermocouple, as shown in fig. 1, which comprises the following steps:
s1: soaking the outer surface of a stainless steel sleeve of the armored thermocouple in an acid solution for 5-10min, taking out, and wiping;
s2: the preparation of the graphene primer, wherein in the composite coating, the graphene primer is adopted as the primer, the epoxy cloud iron intermediate paint is adopted as the intermediate paint, and the fluorocarbon finish is adopted as the finish; the graphene primer comprises a component A and a component B; the component A comprises the following components in parts by weight: 105 parts of epoxy resin, 105 parts of mica powder, 65 parts of iron oxide red, 460 parts of zinc powder, 8 parts of kaolin, 3 parts of dispersant BYK-110, 12 parts of flatting agent 446, 11 parts of defoamer 052, 195 parts of graphene slurry, 24 parts of toluene and 45 parts of styrene; the component B is 70 parts of modified polyamide curing agent; the preparation steps of the component A are as follows: (1) preparing graphene dispersion liquid: adding graphene powder into a diluent, wherein the graphene content is 3%, stirring for 2 hours by a high-speed mixing stirrer, and placing the uniformly dispersed graphene powder into an ultrasonic dispersing instrument for ultrasonic dispersion for 4 hours to obtain uniform black graphene dispersion liquid; (2) preheating epoxy resin: heating the epoxy resin in a 65 ℃ oven for 35min; (3) preparing graphene primer: sequentially adding a defoaming agent, a dispersing agent and a leveling agent into the preheated epoxy resin, stirring for 6min, adding a diluent, uniformly stirring the epoxy resin and an auxiliary agent, adding graphene dispersion liquid, dispersing for 20min, sequentially adding kaolin, iron oxide red, zinc powder and mica powder, stirring for 70min, grinding to a particle size of 70 mu m, and discharging for later use; wherein the diluent is a mixed solvent of toluene and styrene; the preparation steps of the component B are as follows: (1) Heating the modified polyamide to 95 ℃ in an oven, and preserving heat for 12min; (2) Adding 11 parts of diluent and 0.20 part of adhesion promoter into 35 parts of modified polyamide after heat preservation, and uniformly stirring to obtain a component B; uniformly mixing the component A and the component B according to the proportion of 10:1.1, and standing for 20min to obtain the graphene primer; the ratio of toluene to styrene in the diluent is 3:5;
the spraying scheme adopts air spraying, a 2.0 spray gun is adopted for the primer and the intermediate paint, a 1.5 spray gun is adopted for the finish paint, the viscosity of the paint is controlled to be-4 cups, the real dry thickness of each primer is 40 mu m, the interval time of each primer is 12h, the real dry thickness of each intermediate paint is 80 mu m, the interval time of each intermediate paint is 12h, the real dry thickness of each finish paint is 40 mu m, the interval time of each finish paint is 8h, and the paint is placed for 8d after the finish paint, the intermediate paint and the finish paint are all sprayed;
s3: after the spraying of the first layer of composite coating is finished, wrapping a layer of glass fiber cloth on the outer surface of the stainless steel sleeve with paint, uniformly and completely coating a second layer of composite coating on the surface of the glass fiber cloth, wrapping a layer of glass fiber cloth after the second layer of composite coating is dried, uniformly and completely coating a third layer of composite coating on the surface, and drying the third layer of composite coating. Only the first layer of composite coating adopts a spraying scheme, and is sprayed on the stainless steel sleeve outer tube of the armored thermocouple, and the other two layers of composite coating are directly smeared.
Comparative example 1
S1: soaking the outer surface of a stainless steel sleeve of the armored thermocouple in an acid solution for 5-10min, taking out, and wiping;
s2: the polyurethane anticorrosive paint is directly smeared on the outer surface of the stainless steel sleeve of the armored thermocouple;
the spraying scheme adopts air spraying, a 2.0 spray gun is adopted for the primer and the intermediate paint, a 1.5 spray gun is adopted for the finish paint, the viscosity of the paint is controlled to be-4 cups, the real dry thickness of each primer is 30-40 mu m, the interval time of each primer is 6-12h, the real dry thickness of each intermediate paint is 60-80 mu m, the interval time of each intermediate paint is 12h, the real dry thickness of each finish paint is 30-40 mu m, the interval time of each finish paint is 6-8h, and the paint, the intermediate paint and the finish paint are placed for 5-8d after the finish paint is sprayed;
s3: after the spraying of the first layer of polyurethane anti-corrosion paint is finished, wrapping a layer of glass fiber cloth on the outer surface of the stainless steel sleeve with paint, uniformly and completely coating a second layer of polyurethane anti-corrosion paint on the surface of the glass fiber cloth, wrapping a layer of glass fiber cloth after the second layer of polyurethane anti-corrosion paint is dried, uniformly and completely coating a third layer of polyurethane anti-corrosion paint on the surface, and drying the third layer of polyurethane anti-corrosion paint.
Comparative example 2
S1: soaking the outer surface of a stainless steel sleeve of the armored thermocouple in an acid solution for 5-10min, taking out, and wiping;
s2: the polyurethane anticorrosive paint is directly smeared on the outer surface of the stainless steel sleeve of the armored thermocouple;
s3: after the polyurethane anti-corrosion paint is sprayed, wrapping a layer of glass fiber cloth on the outer surface of the stainless steel sleeve with the paint, uniformly and completely coating a second layer of polyurethane anti-corrosion paint on the surface of the glass fiber cloth, and drying the third layer of polyurethane anti-corrosion paint.
The test is as follows: the corrosion-resistant armored thermocouple prepared in the examples 1-4 and the armored thermocouple coated with the polyurethane corrosion-resistant paint in the comparative examples 1-2 are subjected to 800-hour continuous salt fog corrosion resistance test; testing corrosion rate in saturated strong brine at 300 ℃ and under 4MPa air in an alkaline environment; and the temperature is measured for a plurality of times by using the armoured thermocouple, and the difference between the actual temperature and the measured temperature is calculated to obtain the measurement error.
Table 1 experimental condition comparison of examples 1-4 and comparative examples 1, 2
As can be seen from the data in table 1: the anti-corrosion armored thermocouple has higher anti-corrosion capability and strong heat conduction performance, and the measured error is far smaller than that of polyurethane anti-corrosion paint. On the basis of ensuring the corrosion resistance, the heat conduction performance is increased, so that the measurement is more accurate.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be appreciated by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (4)
1. The preparation process of the anti-corrosion armored thermocouple is characterized by comprising the following steps of:
s1: derusting the outer surface of a stainless steel sleeve of the armored thermocouple;
s2: adopting composite paint, and carrying out single-layer spraying treatment on the outer surface of the rust-removed stainless steel sleeve according to a spraying scheme;
s3: after the spraying of the first layer of composite coating is finished, wrapping a layer of glass fiber cloth on the outer surface of the stainless steel sleeve with paint, uniformly and completely coating a second layer of composite coating on the surface of the glass fiber cloth, wrapping a layer of glass fiber cloth after the second layer of composite coating is dried, uniformly and completely coating a third layer of composite coating on the surface, and drying the third layer of composite coating;
wherein,,
in the composite coating, a graphene primer is adopted as a primer, an epoxy cloud iron intermediate paint is adopted as an intermediate paint, and a fluorocarbon finish is adopted as a finish;
the graphene primer comprises a component A and a component B;
the component A comprises the following components in parts by weight:
95-105 parts of epoxy resin, 95-105 parts of mica powder, 55-65 parts of iron oxide red, 440-460 parts of zinc powder, 1-8 parts of kaolin, 1-3 parts of dispersing agent, 7-12 parts of flatting agent, 6-11 parts of defoamer, 180-195 parts of graphene slurry, 13-24 parts of toluene and 30-45 parts of styrene;
55-70 parts of modified polyamide curing agent;
the preparation steps of the component A are as follows:
(1) Preparing graphene dispersion liquid: adding graphene powder into a diluent, wherein the graphene content is 3%, stirring for 2-2.5 hours by a high-speed mixing stirrer, and placing the uniformly dispersed graphene powder into an ultrasonic dispersing instrument for ultrasonic dispersion for 4-4.5 hours to obtain uniform black graphene dispersion liquid;
(2) Preheating epoxy resin: heating epoxy resin in an oven at 60-65deg.C for 30-35min;
(3) Preparing graphene primer: sequentially adding a defoaming agent, a dispersing agent and a leveling agent into the preheated epoxy resin, stirring for 5-6min, adding a diluent, uniformly stirring the epoxy resin and an auxiliary agent, adding a graphene dispersion liquid, dispersing for 20min, sequentially adding kaolin, iron oxide red, zinc powder and mica powder, stirring for 70min, grinding to a particle size of 60-70 mu m, and discharging for later use;
wherein the diluent is a mixed solvent of toluene and styrene;
the preparation steps of the component B are as follows:
(1) Heating the modified polyamide to 90-95 ℃ in an oven, and preserving heat for 10-12min;
(2) And adding 5-11 parts of diluent and 0.15-0.20 part of adhesion promoter into 25-35 parts of modified polyamide after heat preservation, and uniformly stirring to obtain the component B.
2. The preparation process according to claim 1, wherein the graphene primer is obtained by uniformly mixing the component A and the component B according to the ratio of 9-10:0.5-1.1 and standing for 20 min.
3. The process according to claim 1, wherein in step S2, the spray scheme is as follows:
adopting air spraying, selecting 2.0 spray guns for primer and intermediate paint, selecting 1.5 spray guns for finishing paint, controlling the viscosity of the paint to be-4 cups, wherein the real dry thickness of each primer is 30-40 mu m, the interval time of each primer is 6-12h, the real dry thickness of each intermediate paint is 60-80 mu m, the interval time of each intermediate paint is 12h, the real dry thickness of each finish is 30-40 mu m, the interval time of each finish is 6-8h, and the paint, the intermediate paint and the finishing paint are placed for 5-8d after finishing the spraying.
4. The preparation process according to claim 1, wherein the step S1 is specifically:
soaking the outer surface of the stainless steel sleeve of the armored thermocouple in an acidic solution for 5-10min, taking out, and wiping.
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| CN107061929A (en) * | 2017-05-05 | 2017-08-18 | 山东电力基本建设总公司 | Steel circulating water pipe anti-corrosion method |
| CN108997889A (en) * | 2018-08-09 | 2018-12-14 | 湖南省金海科技有限公司 | A kind of ocean naval vessel graphene heavy antisepsis priming paint and preparation method thereof |
| CN109608994A (en) * | 2018-12-27 | 2019-04-12 | 石家庄市油漆厂 | Graphene anticorrosive paint and preparation method thereof applied to marine settings |
| CN110343446A (en) * | 2019-07-18 | 2019-10-18 | 江苏环宇建设工程有限公司 | A kind of antirust, anti-corrosive method for natural gas line |
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