CN110694882A - Scale-proof heating pipe inner wall coating and processing technology thereof - Google Patents

Scale-proof heating pipe inner wall coating and processing technology thereof Download PDF

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Publication number
CN110694882A
CN110694882A CN201911068008.0A CN201911068008A CN110694882A CN 110694882 A CN110694882 A CN 110694882A CN 201911068008 A CN201911068008 A CN 201911068008A CN 110694882 A CN110694882 A CN 110694882A
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coating
bottom layer
heating pipe
wall
surface layer
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CN110694882B (en
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王建定
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Ningbo Yangtian Magnetic Energy Technology Co Ltd
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Ningbo Yangtian Magnetic Energy Technology Co Ltd
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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
    • B05D7/22—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 internal surfaces, e.g. of tubes
    • B05D7/222—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 internal surfaces, e.g. of tubes of pipes
    • 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
    • B05D3/06—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 exposure to radiation
    • B05D3/061—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 exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • 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
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/10—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an adhesive surface
    • 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
    • B05D7/24—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 for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/542—No clear coat specified the two layers being cured or baked together
    • 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
    • C09D171/00—Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D171/02—Polyalkylene oxides
    • C09D171/03—Polyepihalohydrins
    • 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
    • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
    • 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
    • C09D5/18—Fireproof paints including high temperature resistant paints
    • 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
    • B05D2451/00—Type of carrier, type of coating (Multilayers)
    • 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
    • B05D2518/00—Other type of polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2518/00—Other type of polymers
    • B05D2518/10—Silicon-containing polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2602/00—Organic fillers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

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  • Life Sciences & Earth Sciences (AREA)
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Abstract

The invention provides a scale-proof heating pipe inner wall coating and a processing technology thereof, comprising two steps of sequentially coating the inner wall of a heating pipe to form a bottom layer and a surface layer; wherein, the bottom layer is obtained by coating a bottom layer coating, and the preparation method of the bottom layer coating comprises the following steps: firstly, adding the epichlorohydrin resin into a bottom layer solvent, stirring and dissolving, then adding the polyether-ether-ketone powder and the polyfluorinated ethylene propylene, and grinding by using a sand mill to obtain the polyether-ether-ketone perfluoroethylene-propylene copolymer; the preparation method of the surface layer comprises the following steps: firstly preparing mixed solution of ethylene glycol allyl ether, Karstedt catalyst, ethoxylated trimethylolpropane triacrylate, chlorinated polyether resin and a first part of ultraviolet initiator, then dropwise adding the mixed solution into hydrogen-containing silicone oil, reacting, cooling to room temperature, pre-polymerizing, then mixing a pre-polymerized product with a cross-linking agent and a second part of ultraviolet initiator, coating the mixture on the surface of a bottom layer, and carrying out ultraviolet curing to obtain the surface layer. Has higher adhesive force and impact resistance, can be used for a long time under the condition of high temperature, and effectively prevents water scale.

Description

Scale-proof heating pipe inner wall coating and processing technology thereof
Technical Field
The invention relates to the technical field of scale prevention, in particular to a scale prevention heating pipe inner wall coating and a processing technology thereof.
Background
Heating tubes are typically metal tubular heating elements such as stainless steel, which face one of the major challenges of internal scaling. If the problem is not solved for a long time, a layer of compact and hard scale is formed on the inner surface of the heating pipe after long-term accumulation. The formation of scale, which is actually a sparingly soluble or slightly soluble salt in water, is prone to precipitation and deposition on the surface of the tube wall. The forming process comprises the following steps: the low solubility salt in water forms micro-crystal under the supersaturation state, and the crystal is adhered to the wall surface, gathered and precipitated into scale.
Because the heat transfer coefficient of the scale is extremely low, on one hand, the heating efficiency of the heating pipe is influenced, and on the other hand, the water inlet pipe and the water outlet pipe are blocked, so that the problems of unsmooth water outlet, even water outlet failure and the like are caused. The regular cleaning consumes a large amount of manpower and material resources, so that the direct processing of the scale-proof coating on the inner wall of the heating pipe becomes a better choice.
In order to prevent or reduce the formation of scale on the surface of the material, the surface of the material must be hydrophobic, such as spraying a fluorine-containing coating on the surface, processing a porcelain layer and the like. Patent CN105131663B discloses an inorganic coating for preventing scale generation, which is prepared by mixing inorganic resin, alumina, titanium dioxide, silicon whisker, kaolin, film forming promoter, etc., but the biggest problem of the coating is that the adhesion force on the wall of a metal heating tube is poor, and the coating cannot be used for a long time.
Disclosure of Invention
The invention aims to provide a scale-proof heating tube inner wall coating and a processing technology thereof, which have high adhesive force and impact resistance, can be used for a long time under a high-temperature condition and effectively prevent scale.
In order to achieve the purpose, the invention is realized by the following scheme:
a processing technology for an inner wall coating of a heating pipe for preventing scale comprises the steps of sequentially coating the inner wall of the heating pipe to form a bottom layer and a surface layer; wherein the bottom layer is obtained by coating a bottom layer coating, and the preparation method of the bottom layer coating comprises the following steps: firstly, adding chlorinated polyether resin into a bottom layer solvent, stirring for dissolving, then adding polyether-ether-ketone powder and polyfluorinated ethylene propylene, and grinding for 4-6 hours by using a sand mill to obtain the bottom layer coating; the preparation method of the surface layer comprises the following steps: firstly, preparing mixed solution of ethylene glycol allyl ether, Karstedt catalyst, ethoxylated trimethylolpropane triacrylate, epichlorohydrin resin and a first part of ultraviolet initiator, then slowly dripping the mixed solution into hydrogen-containing silicone oil at 70-90 ℃ through a constant-pressure dropping funnel, continuing to react for 3 hours after dripping is finished, cooling to room temperature, carrying out prepolymerization, then mixing a prepolymerization product, a crosslinking agent and a second part of ultraviolet initiator, coating the mixture on the surface of a bottom layer, and carrying out ultraviolet curing to obtain the surface layer.
Preferably, the thickness of the bottom layer is 40-60 nm, and the thickness of the surface layer is 50-60 μm.
Preferably, in the primer, the mass ratio of the epichlorohydrin resin, the primer solvent, the polyether-ether-ketone powder and the fluorinated ethylene propylene is 1: 5-8: 0.3-0.4: 0.25 to 0.35.
Preferably, the bottom layer solvent is prepared from chloroform and xylene according to a mass ratio of 1: 0.2 to 0.5 by weight.
Preferably, the melt index of the polyether-ether-ketone powder is 100-120 g/10min, and the particle size is 400-500 meshes.
Preferably, in the preparation process of the surface layer, the mass ratio of the ethylene glycol monoallyl ether to the Karstedt catalyst, the ethoxylated trimethylolpropane triacrylate, the epichlorohydrin resin, the first part ultraviolet initiator, the hydrogen-containing silicone oil, the crosslinking agent and the second part ultraviolet initiator is 1: 0.1-0.2: 0.8-1: 0.2-0.3: 0.001 to 0.002: 2-3: 0.02-0.03: 0.003 to 0.004.
Preferably, the Karstedt catalyst is a dimethylbenzene solution with the mass concentration of 2%, and the hydrogen content of the hydrogen-containing silicone oil is 0.18% or more than or equal to 0.6%.
Preferably, the dropping time of the mixed solution into the hydrogen-containing silicone oil is 50 to 60 minutes.
Preferably, the ultraviolet photoinitiator is selected from any one of 2, 4-dihydroxybenzophenone, alpha-dimethoxy-alpha-phenylacetophenone or alpha-hydroxyalkyl phenone.
Preferably, the prepolymerization process conditions are as follows: and (4) directly irradiating for 30-50 seconds under an ultraviolet lamp.
Preferably, the process conditions of ultraviolet curing are as follows: and (4) directly irradiating for 2-3 minutes under an ultraviolet lamp.
Preferably, the primer is coated by an air spraying method, which comprises the following steps: spraying the coating on the inner wall of the heating pipe subjected to sand blasting by using a spray gun and an air compressor, baking for 40-60 minutes at 70-80 ℃, and then curing for 10-15 minutes at 220-240 ℃.
Further preferably, the diameter of a nozzle of the spray gun is 1mm, and the air pressure output by the air compressor is 2-4 kg/cubic centimeter.
Further preferably, the process conditions of the sand blasting treatment are as follows: 60-80 mesh carborundum, the pressure is 0.4-0.6 MPa, the spraying distance is 0.4-0.5 m, and the spraying angle is 50-70 degrees.
In addition, the invention also claims a scale-proof heating pipe inner wall coating prepared by the processing technology.
The invention also claims a scale-proof heating pipe, the inner wall of which is coated with the coating.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the inner wall of the heating pipe is sequentially coated to form the bottom layer and the surface layer, the bottom layer and the surface layer supplement each other, the bottom layer is mainly used for enhancing the adhesive force on the inner wall of the heating pipe, the surface layer and the bottom layer are both organic and have similar components, the adhesive force between the surface layer and the bottom layer is good, the adhesive force of the whole coating is ensured, the impact resistance is improved, and the coating can be used for a long time at the high temperature of 250 ℃; the contact angle of the surface layer is large, and the surface scaling is effectively prevented. The inner wall coating has high adhesive force and impact resistance, can be used for a long time under the high-temperature condition, and effectively prevents scale.
(2) The bottom layer is obtained by coating the bottom layer coating, the bottom layer coating is prepared by mixing epichlorohydrin resin, a bottom layer solvent, polyether-ether-ketone, polyfluorinated ethylene propylene and the like, the polyether resin has good viscosity, the adhesive force on the inner wall of a heating pipe is ensured, the polyether-ether-ketone has excellent high-temperature resistance, and the polyfluorinated ethylene propylene has a completely fluorinated structure and also has excellent high-temperature resistance. The addition of the polyether-ether-ketone and the polyfluorinated ethylene propylene improves the high temperature resistance of the bottom layer, and the ether bond caused by the polyether-ether-ketone increases the binding force with the inner wall of the heating pipe, so that the polyfluorinated ethylene propylene has high carbon-fluorine bond energy and good hydrophobicity, and prevents water molecules from entering between the bottom layer and the inner wall of the heating pipe to influence the adhesive force of the coating.
(3) The surface layer of the invention utilizes the hydrosilation reaction of ethylene glycol monoallyl ether and hydrogen-containing silicone oil to construct a hydrogel system, the ultraviolet polymerization of the ethoxylated trimethylolpropane triacrylate can be further gelled, the gelled structure has good encapsulation performance to the bottom layer, and the gel structure encapsulates the epichlorohydrin resin, so that the bonding force between the surface layer and the bottom layer is further enhanced due to the interaction of the epichlorohydrin resin and the ether bond lone pair electrons in the bottom layer. In the gelation process, due to the acting force between the surface of the substrate and the branched chain, the branched chain is converged, the surface is smooth, the contact angle of the surface layer is large, and the surface fouling is effectively prevented. The gel structure has certain buffering and better impact resistance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A process for preparing the coating on the inner surface of a heating tube for preventing scale includes sequentially coating the bottom layer and the surface layer on the inner surface of the heating tube; wherein, the bottom layer is obtained by coating a bottom layer coating, and the preparation method of the bottom layer coating comprises the following steps: firstly, adding 1kg of chlorinated polyether resin into 5kg of a bottom layer solvent, stirring for dissolving, then adding 0.3kg of polyether-ether-ketone powder and 0.25kg of fluorinated ethylene propylene, and grinding for 4 hours by using a sand mill to obtain the bottom layer coating; the preparation method of the surface layer comprises the following steps: firstly, preparing 1kg of ethylene glycol monoallyl ether, 0.1kg of Karstedt catalyst, 0.8kg of ethoxylated trimethylolpropane triacrylate, 0.2kg of chlorinated polyether resin and 0.001kg of ultraviolet initiator into a mixed solution, then slowly dripping the mixed solution into 2kg of hydrogen-containing silicone oil at 70 ℃ through a constant-pressure dropping funnel, continuing to react for 3 hours after dripping is finished, cooling to room temperature, carrying out prepolymerization, mixing a prepolymerization product with 0.02kg of cross-linking agent and 0.003kg of ultraviolet initiator, coating the mixture on the surface of a bottom layer, and carrying out ultraviolet curing to obtain the surface layer.
In this example, the thickness of the underlayer was 40nm, and the thickness of the surface layer was 50 μm.
The bottom layer solvent is prepared from chloroform and xylene according to a mass ratio of 1: 0.2, and mixing.
The melt index of the polyether-ether-ketone powder is 100g/10min, and the particle size is 400 meshes.
The Karstedt catalyst is a dimethylbenzene solution with the mass concentration of 2%, and the hydrogen content of the hydrogen-containing silicone oil is 0.18%.
The dropping time of the mixed solution into the hydrogen-containing silicone oil was 50 minutes.
The ultraviolet initiator is 2, 4-dihydroxy benzophenone.
The process conditions of the prepolymerization are as follows: direct irradiation under an ultraviolet lamp for 30 seconds. The technological conditions of ultraviolet light curing are as follows: direct irradiation under an ultraviolet lamp for 2 minutes.
The primer is coated by adopting an air spraying method, and the specific method comprises the following steps: the coating was sprayed onto the inner wall of the sandblasted heating tube using a spray gun and an air compressor, baked at 70 ℃ for 40 minutes, and then cured at 220 ℃ for 10 minutes.
The nozzle diameter of the spray gun is 1mm, and the air pressure output by the air compressor is 2 kg/cubic centimeter.
The process conditions of the sand blasting treatment are as follows: 60-mesh carborundum, the pressure of 0.4MPa, the spraying distance of 0.4m and the spraying angle of 50 degrees.
Example 2
A process for preparing the coating on the inner surface of a heating tube for preventing scale includes sequentially coating the bottom layer and the surface layer on the inner surface of the heating tube; wherein, the bottom layer is obtained by coating a bottom layer coating, and the preparation method of the bottom layer coating comprises the following steps: firstly, adding 1kg of chlorinated polyether resin into 8kg of bottom layer solvent, stirring for dissolving, then adding 0.4kg of polyether-ether-ketone powder and 0.35kg of fluorinated ethylene propylene, and grinding for 6 hours by using a sand mill to obtain the bottom layer coating; the preparation method of the surface layer comprises the following steps: firstly, preparing 1kg of ethylene glycol monoallyl ether, 0.2kg of Karstedt catalyst, 1kg of ethoxylated trimethylolpropane triacrylate, 0.3kg of chlorinated polyether resin and 0.002kg of ultraviolet initiator into a mixed solution, then slowly dripping the mixed solution into 3kg of hydrogen-containing silicone oil at 90 ℃ through a constant-pressure dropping funnel, continuing to react for 3 hours after dripping is finished, cooling to room temperature, carrying out prepolymerization, mixing a prepolymerization product, 0.03kg of cross-linking agent and 0.004kg of ultraviolet initiator, coating the mixture on the surface of a bottom layer, and carrying out ultraviolet curing to obtain the surface layer.
In this example, the thickness of the underlayer was 60nm, and the thickness of the surface layer was 60 μm.
The bottom layer solvent is prepared from chloroform and xylene according to a mass ratio of 1: 0.5, and mixing.
The melt index of the polyetheretherketone powder is 120g/10min and the particle size is 500 mesh.
The Karstedt catalyst is a dimethylbenzene solution with the mass concentration of 2%, and the hydrogen content of the hydrogen-containing silicone oil is 0.6%.
The dropping time of the mixed solution into the hydrogen-containing silicone oil was 60 minutes.
The ultraviolet initiator is alpha-dimethoxy-alpha-phenylacetophenone.
The process conditions of the prepolymerization are as follows: direct irradiation under an ultraviolet lamp for 50 seconds. The technological conditions of ultraviolet light curing are as follows: direct irradiation under an ultraviolet lamp for 3 minutes.
The primer is coated by adopting an air spraying method, and the specific method comprises the following steps: the coating was sprayed with a spray gun and an air compressor onto the inner wall of the sandblasted heating tube, baked at 80 ℃ for 60 minutes and then cured at 240 ℃ for 15 minutes.
The nozzle diameter of the spray gun is 1mm, and the air pressure output by the air compressor is 4 kg/cubic centimeter.
The process conditions of the sand blasting treatment are as follows: 80-mesh carborundum, the pressure of 0.6MPa, the spraying distance of 0.5m and the spraying angle of 70 degrees.
Example 3
A process for preparing the coating on the inner surface of a heating tube for preventing scale includes sequentially coating the bottom layer and the surface layer on the inner surface of the heating tube; wherein, the bottom layer is obtained by coating a bottom layer coating, and the preparation method of the bottom layer coating comprises the following steps: firstly, adding 1kg of chlorinated polyether resin into 5kg of a bottom layer solvent, stirring for dissolving, then adding 0.4kg of polyether-ether-ketone powder and 0.25kg of fluorinated ethylene propylene, and grinding for 6 hours by using a sand mill to obtain the bottom layer coating; the preparation method of the surface layer comprises the following steps: firstly, preparing 1kg of ethylene glycol monoallyl ether, 0.1kg of Karstedt catalyst, 1kg of ethoxylated trimethylolpropane triacrylate, 0.2kg of chlorinated polyether resin and 0.002kg of ultraviolet initiator into a mixed solution, then slowly dripping the mixed solution into 3kg of hydrogen-containing silicone oil at 70 ℃ through a constant-pressure dropping funnel, continuing to react for 3 hours after dripping is finished, cooling to room temperature, carrying out prepolymerization, mixing a prepolymerization product, 0.02kg of cross-linking agent and 0.004kg of ultraviolet initiator, coating the mixture on the surface of a bottom layer, and carrying out ultraviolet curing to obtain the surface layer.
In this example, the thickness of the underlayer was 40nm, and the thickness of the surface layer was 60 μm.
The bottom layer solvent is prepared from chloroform and xylene according to a mass ratio of 1: 0.2, and mixing.
The melt index of the polyetheretherketone powder was 120g/10min and the particle size was 400 mesh.
The Karstedt catalyst is a dimethylbenzene solution with the mass concentration of 2%, and the hydrogen content of the hydrogen-containing silicone oil is 0.7%.
The dropping time of the mixed solution into the hydrogen-containing silicone oil was 60 minutes.
The ultraviolet initiator is alpha-hydroxyalkyl benzophenone.
The process conditions of the prepolymerization are as follows: direct irradiation under an ultraviolet lamp for 30 seconds. The technological conditions of ultraviolet light curing are as follows: direct irradiation under an ultraviolet lamp for 3 minutes.
The primer is coated by adopting an air spraying method, and the specific method comprises the following steps: the coating was sprayed with a spray gun and an air compressor onto the inner wall of a heat pipe subjected to sand blasting, baked at 70 ℃ for 60 minutes, and then cured at 220 ℃ for 15 minutes.
The nozzle diameter of the spray gun is 1mm, and the air pressure output by the air compressor is 2 kg/cubic centimeter.
The process conditions of the sand blasting treatment are as follows: 80-mesh carborundum, the pressure of 0.4MPa, the spraying distance of 0.5m and the spraying angle of 50 degrees.
Example 4
A process for preparing the coating on the inner surface of a heating tube for preventing scale includes sequentially coating the bottom layer and the surface layer on the inner surface of the heating tube; wherein, the bottom layer is obtained by coating a bottom layer coating, and the preparation method of the bottom layer coating comprises the following steps: firstly, adding 1kg of chlorinated polyether resin into 8kg of bottom layer solvent, stirring for dissolving, then adding 0.3kg of polyether-ether-ketone powder and 0.35kg of fluorinated ethylene propylene, and grinding for 4 hours by using a sand mill to obtain the bottom layer coating; the preparation method of the surface layer comprises the following steps: firstly, preparing 1kg of ethylene glycol monoallyl ether, 0.2kg of Karstedt catalyst, 0.8kg of ethoxylated trimethylolpropane triacrylate, 0.3kg of chlorinated polyether resin and 0.001kg of ultraviolet initiator into a mixed solution, then slowly dripping the mixed solution into 2kg of hydrogen-containing silicone oil at 90 ℃ through a constant-pressure dropping funnel, continuing to react for 3 hours after dripping is finished, cooling to room temperature, carrying out prepolymerization, then mixing a prepolymerization product, 0.03kg of cross-linking agent and 0.003kg of ultraviolet initiator, coating the mixture on the surface of a bottom layer, and carrying out ultraviolet curing to obtain the surface layer.
In this example, the thickness of the underlayer was 60nm, and the thickness of the surface layer was 50 μm.
The bottom layer solvent is prepared from chloroform and xylene according to a mass ratio of 1: 0.5, and mixing.
The melt index of the polyether-ether-ketone powder is 100g/10min, and the particle size is 500 meshes.
The Karstedt catalyst is a dimethylbenzene solution with the mass concentration of 2%, and the hydrogen content of the hydrogen-containing silicone oil is 0.18%.
The dropping time of the mixed solution into the hydrogen-containing silicone oil was 50 minutes.
The ultraviolet initiator is 2, 4-dihydroxy benzophenone.
The process conditions of the prepolymerization are as follows: direct irradiation under an ultraviolet lamp for 50 seconds. The technological conditions of ultraviolet light curing are as follows: direct irradiation under an ultraviolet lamp for 2 minutes.
The primer is coated by adopting an air spraying method, and the specific method comprises the following steps: the coating was sprayed onto the inner wall of the sandblasted heating tube using a spray gun and an air compressor, baked at 80 ℃ for 40 minutes, and then cured at 240 ℃ for 10 minutes.
The nozzle diameter of the spray gun is 1mm, and the air pressure output by the air compressor is 4 kg/cubic centimeter.
The process conditions of the sand blasting treatment are as follows: 60-mesh carborundum, the pressure of 0.6MPa, the spraying distance of 0.4m and the spraying angle of 70 degrees.
Example 5
A process for preparing the coating on the inner surface of a heating tube for preventing scale includes sequentially coating the bottom layer and the surface layer on the inner surface of the heating tube; wherein, the bottom layer is obtained by coating a bottom layer coating, and the preparation method of the bottom layer coating comprises the following steps: firstly, adding 1kg of chlorinated polyether resin into 6kg of a bottom layer solvent, stirring for dissolving, then adding 0.35kg of polyether-ether-ketone powder and 0.3kg of fluorinated ethylene propylene, and grinding for 5 hours by using a sand mill to obtain the bottom layer coating; the preparation method of the surface layer comprises the following steps: firstly, preparing 1kg of ethylene glycol monoallyl ether, 0.15kg of Karstedt catalyst, 0.9kg of ethoxylated trimethylolpropane triacrylate, 0.25kg of chlorinated polyether resin and 0.0015kg of ultraviolet initiator into a mixed solution, then slowly dripping the mixed solution into 2.5kg of hydrogen-containing silicone oil at 80 ℃ through a constant-pressure dropping funnel, continuously reacting for 3 hours after dripping is finished, cooling to room temperature, carrying out prepolymerization, then mixing a prepolymerization product, 0.025kg of cross-linking agent and 0.0035kg of ultraviolet initiator, coating the mixture on the surface of a bottom layer, and carrying out ultraviolet curing to obtain the surface layer.
In this example, the thickness of the underlayer was 50nm, and the thickness of the surface layer was 55 μm.
The bottom layer solvent is prepared from chloroform and xylene according to a mass ratio of 1: 0.4, and mixing.
The melt index of the polyetheretherketone powder is 110g/10min and the particle size is 500 mesh.
The Karstedt catalyst is a dimethylbenzene solution with the mass concentration of 2%, and the hydrogen content of the hydrogen-containing silicone oil is 0.8%.
The dropping time of the mixed solution into the hydrogen-containing silicone oil was 55 minutes.
The ultraviolet initiator is alpha-dimethoxy-alpha-phenylacetophenone.
The process conditions of the prepolymerization are as follows: direct irradiation under an ultraviolet lamp for 40 seconds. The technological conditions of ultraviolet light curing are as follows: direct irradiation under an ultraviolet lamp for 2 minutes.
The primer is coated by adopting an air spraying method, and the specific method comprises the following steps: the coating was sprayed with a spray gun and an air compressor onto the inner wall of a sand-blasted heating tube, baked at 75 ℃ for 50 minutes, and then cured at 230 ℃ for 12 minutes.
The nozzle diameter of the spray gun is 1mm, and the air pressure output by the air compressor is 3 kg/cubic centimeter.
The process conditions of the sand blasting treatment are as follows: 70-mesh carborundum, the pressure of 0.5MPa, the spraying distance of 0.45m and the spraying angle of 60 degrees.
Comparative example 1
A processing technology of a heating pipe inner wall coating is characterized in that a surface layer is sequentially coated on the inner wall of a heating pipe; the preparation method of the surface layer comprises the following steps: firstly, preparing 1kg of ethylene glycol monoallyl ether, 0.15kg of Karstedt catalyst, 0.9kg of ethoxylated trimethylolpropane triacrylate, 0.25kg of chlorinated polyether resin and 0.0015kg of ultraviolet initiator into a mixed solution, then slowly dripping the mixed solution into 2.5kg of hydrogen-containing silicone oil at 80 ℃ through a constant-pressure dropping funnel, continuing to react for 3 hours after dripping is finished, cooling to room temperature, carrying out prepolymerization, then mixing a prepolymerization product, 0.025kg of cross-linking agent and 0.0035kg of ultraviolet initiator, coating the mixture on the surface of a bottom layer, and carrying out ultraviolet curing to obtain the surface layer.
Wherein the thickness of the surface layer in this comparative example was 55 μm.
The Karstedt catalyst is a dimethylbenzene solution with the mass concentration of 2%, and the hydrogen content of the hydrogen-containing silicone oil is 0.8%.
The dropping time of the mixed solution into the hydrogen-containing silicone oil was 55 minutes.
The ultraviolet initiator is alpha-dimethoxy-alpha-phenylacetophenone.
The process conditions of the prepolymerization are as follows: direct irradiation under an ultraviolet lamp for 40 seconds. The technological conditions of ultraviolet light curing are as follows: direct irradiation under an ultraviolet lamp for 2 minutes.
Comparative example 2
A processing technology of a heating pipe inner wall coating is characterized in that a bottom layer is coated on the inner wall of a heating pipe; wherein, the bottom layer is obtained by coating a bottom layer coating, and the preparation method of the bottom layer coating comprises the following steps: firstly, adding 1kg of chlorinated polyether resin into 6kg of bottom layer solvent, stirring for dissolving, then adding 0.35kg of polyether-ether-ketone powder and 0.3kg of fluorinated ethylene propylene, and grinding for 5 hours by using a sand mill to obtain the bottom layer coating.
Wherein the thickness of the underlayer was 50nm in this comparative example.
The bottom layer solvent is prepared from chloroform and xylene according to a mass ratio of 1: 0.4, and mixing.
The melt index of the polyetheretherketone powder is 110g/10min and the particle size is 500 mesh.
The primer is coated by adopting an air spraying method, and the specific method comprises the following steps: the coating was sprayed with a spray gun and an air compressor onto the inner wall of a sand-blasted heating tube, baked at 75 ℃ for 50 minutes, and then cured at 230 ℃ for 12 minutes.
The nozzle diameter of the spray gun is 1mm, and the air pressure output by the air compressor is 3 kg/cubic centimeter.
The process conditions of the sand blasting treatment are as follows: 70-mesh carborundum, the pressure of 0.5MPa, the spraying distance of 0.45m and the spraying angle of 60 degrees.
Test examples
The related performance test of the inner wall of the heating pipe processed in the embodiment 1-5 and the comparative example 1-2 comprises the following steps: adhesion (GB 1720-79), impact resistance (GB/T20624.1-2006), contact angle (JC 2000D1 type contact angle measuring instrument), and the results are shown in Table 1.
TABLE 1 comparison of the Performance tests of the examples and comparative examples
Adhesion force Impact resistance (more than or equal to 50 kg-cm) Contact angle (°)
Example 1 Level 1 By passing 152
Example 2 Level 1 By passing 151
Example 3 Level 1 By passing 153
Example 4 Level 1 By passing 153
Example 5 Level 1 By passing 155
Comparative example 1 4 stage By passing 154
Comparative example 2 Level 1 Do not pass through 88
As can be seen from Table 1, the coatings processed in the embodiments 1 to 5 of the invention have good adhesion and impact resistance, large surface contact angle and good scale inhibition performance. Comparative example 1 only the surface layer was coated, and although the epichlorohydrin resin in the surface layer had tackiness, the gel structure was not favorable for good bonding with the inner wall of the heating tube, and the adhesion was significantly poor. Comparative example 2 only coated the bottom layer, the impact resistance of the coating was poor, the surface contact angle was small, and the scale inhibition performance was poor.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (9)

1. A processing technology for an inner wall coating of a heating pipe for preventing scale comprises the steps of sequentially coating the inner wall of the heating pipe to form a bottom layer and a surface layer; the primer is characterized in that the primer is obtained by coating primer, and the preparation method of the primer is as follows: firstly, adding chlorinated polyether resin into a bottom layer solvent, stirring for dissolving, then adding polyether-ether-ketone powder and polyfluorinated ethylene propylene, and grinding for 4-6 hours by using a sand mill to obtain the bottom layer coating; the preparation method of the surface layer comprises the following steps: firstly, preparing mixed solution of ethylene glycol allyl ether, Karstedt catalyst, ethoxylated trimethylolpropane triacrylate, epichlorohydrin resin and a first part of ultraviolet initiator, then slowly dripping the mixed solution into hydrogen-containing silicone oil at 70-90 ℃ through a constant-pressure dropping funnel, continuing to react for 3 hours after dripping is finished, cooling to room temperature, carrying out prepolymerization, then mixing a prepolymerization product, a crosslinking agent and a second part of ultraviolet initiator, coating the mixture on the surface of a bottom layer, and carrying out ultraviolet curing to obtain the surface layer.
2. The process according to claim 1, wherein the thickness of the bottom layer is 40 to 60nm and the thickness of the surface layer is 50 to 60 μm.
3. The process according to claim 1, wherein the bottom layer solvent is a mixture of chloroform and xylene in a mass ratio of 1: 0.2 to 0.5 by weight.
4. The process according to claim 1, wherein the polyetheretherketone powder has a melt index of 100 to 120g/10min and a particle size of 400 to 500 mesh.
5. The process according to claim 1, wherein the prepolymerization process conditions are as follows: and (4) directly irradiating for 30-50 seconds under an ultraviolet lamp.
6. The process according to any one of claims 1 to 5, wherein the process conditions of UV curing are as follows: and (4) directly irradiating for 2-3 minutes under an ultraviolet lamp.
7. The process according to any one of claims 1 to 6, wherein the primer is applied by air spraying by: spraying the coating on the inner wall of the heating pipe subjected to sand blasting by using a spray gun and an air compressor, baking for 40-60 minutes at 70-80 ℃, and then curing for 10-15 minutes at 220-240 ℃.
8. A scale-resistant coating on the inner wall of a heating pipe prepared by the process of any one of claims 1 to 7.
9. A scale-inhibiting heating pipe characterized by an inner wall coated with the coating of claim 8.
CN201911068008.0A 2019-11-04 2019-11-04 Scale-proof heating pipe inner wall coating and processing technology thereof Active CN110694882B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102500537A (en) * 2011-11-18 2012-06-20 吉林大学 Preparation method for anticorrosion wear-resistant anti-scaling plunger of oil well pump
CN109988445A (en) * 2019-04-09 2019-07-09 浙江国能科技有限公司 A kind of super water paint for going water decontamination to go stain

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102500537A (en) * 2011-11-18 2012-06-20 吉林大学 Preparation method for anticorrosion wear-resistant anti-scaling plunger of oil well pump
CN109988445A (en) * 2019-04-09 2019-07-09 浙江国能科技有限公司 A kind of super water paint for going water decontamination to go stain

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