CN113667374A - Water-based epoxy thick-paste anticorrosive paint for petroleum steel pipes - Google Patents
Water-based epoxy thick-paste anticorrosive paint for petroleum steel pipes Download PDFInfo
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- CN113667374A CN113667374A CN202110850919.XA CN202110850919A CN113667374A CN 113667374 A CN113667374 A CN 113667374A CN 202110850919 A CN202110850919 A CN 202110850919A CN 113667374 A CN113667374 A CN 113667374A
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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
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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
- 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
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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
- 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
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- 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
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Abstract
The invention discloses a water-based epoxy thick paste petroleum steel pipe anticorrosive paint which comprises the following raw materials in parts by weight: and (2) component A: slurry preparation: 25-55 parts of epoxy resin, 10-30 parts of polytetrafluoroethylene emulsion, 2-12 parts of iron oxide red, 4-14 parts of antirust pigment, 8-25 parts of superfine barium sulfate, 5-15 parts of talcum powder, 1-6 parts of anti-settling agent, 0.1-2 parts of defoaming agent, 0.1-3 parts of flatting agent, 1-20 parts of glass beads and 1-15 parts of polyester fiber; 0.4-4 parts of dispersant, 2-20 parts of deionized water, and paint mixing: 30-60 parts of lacquer pulp, 5-15 parts of epoxy resin and 1-10 parts of propylene glycol methyl ether. The water-based epoxy thick paste petroleum steel pipe anticorrosive paint has the advantages of being fast in drying, ageing-resistant and the like, the problems that the mode of liquid epoxy coating is adopted, the anticorrosive effect meets the technical specification requirement of repairing an external anticorrosive coating of a SY/T5918-2011 buried steel pipeline, the coating thickness reaches more than 300 mu m, the paint is generally required to be coated for 2-3 times, and the drying time of the epoxy resin coating is as long as more than 24 hours, the required drying field area is large, and the construction efficiency is low are solved.
Description
Technical Field
The invention relates to the technical field of a water-based anticorrosive paint and a preparation method thereof, in particular to a water-based epoxy thick paste petroleum steel pipe anticorrosive paint.
Background
At present, the types of the outer wall anticorrosive coatings of the commonly used oil steel pipes are as follows: petroleum asphalt coating, coal tar asphalt coating, welding epoxy, liquid epoxy, three-layer polyethylene or polypropylene, and the like. The existing polyolefin coating, epoxy powder coating, epoxy resin coating and other anticorrosion technologies are widely applied.
The method adopts a liquid epoxy coating mode, the anticorrosive effect meets the technical specification requirement of repairing the external anticorrosive coating of the SY/T5918-2011 buried steel pipeline, the coating thickness reaches more than 300 mu m, and the coating is generally coated for 2-3 times, because the drying time of the epoxy resin coating is over 24 hours, the area of the required drying field is large, the construction efficiency is low, and in order to meet the market requirement, the fast-drying waterborne petroleum steel pipe outer wall anticorrosive coating which can survive once is urgently needed to be developed.
Disclosure of Invention
The invention aims to provide a water-based epoxy thick-paste petroleum steel pipe anticorrosive paint to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the water-based epoxy thick-paste anticorrosive paint for the petroleum steel pipe comprises the following raw materials in parts by weight:
and (2) component A:
slurry preparation: 25-55 parts of epoxy resin, 10-30 parts of polytetrafluoroethylene emulsion, 2-12 parts of iron oxide red, 4-14 parts of antirust pigment, 8-25 parts of superfine barium sulfate, 5-15 parts of talcum powder, 1-6 parts of anti-settling agent, 0.1-2 parts of defoaming agent, 0.1-3 parts of flatting agent, 1-20 parts of glass beads and 1-15 parts of polyester fiber; 0.4-4 parts of dispersing agent and 2-20 parts of deionized water.
Paint mixing:
30-60 parts of lacquer pulp, 5-15 parts of epoxy resin, 1-10 parts of propylene glycol methyl ether, 1-10 parts of thickening agent, 1-10 parts of wetting agent and 2-10 parts of reactive diluent.
And (B) component: 10-30 parts of polyamide curing agent and 1-10 parts of deionized water.
As a still further scheme of the invention: the preparation method of the water-based epoxy thick-paste anticorrosive paint for the petroleum steel pipe comprises the following steps;
the component A comprises:
weighing epoxy resin, polytetrafluoroethylene emulsion, iron oxide red, anti-rust pigment, superfine barium sulfate, talcum powder, anti-settling agent, defoaming agent, leveling agent, glass beads, polyester fiber, dispersing agent and deionized water according to the formula ratio for later use;
1) putting epoxy resin, a defoaming agent, a flatting agent and a dispersing agent into a stainless steel dispersion tank, and stirring and dispersing;
2) then sequentially adding iron oxide red, antirust pigment, superfine barium sulfate, talcum powder, anti-settling agent, glass beads and polyester fiber, dispersing at a high speed, confirming that the pigment and the filler are fully wetted and the viscosity is moderate, and then grinding in a grinder;
3) grinding with a grinder and cooling water, controlling grinding fineness and material temperature to form color paste, and packaging for later use;
4) adding the color paste obtained in the step 3) into a dispersion tank for dispersion, sequentially adding a defoaming agent and a leveling agent, stirring, adding a polytetrafluoroethylene emulsion, and stirring;
5) and (3) filtering and packaging the mixed liquid color paste obtained in the step 4) by using a 100-mesh filter screen to obtain the component A.
The component B comprises:
6) weighing polyamide curing agent and deionized water according to the formula ratio for later use;
7) sequentially adding an amide curing agent and deionized water into a stainless steel dispersion tank, and filtering and packaging by using a 100-mesh filter screen;
8) according to the component A: the component B is 6: 1 (weight ratio) and mixing uniformly.
As a still further scheme of the invention: the stirring dispersion time in the step 1) is 10-15min, and the rotating speed is 600-700 r/min.
As a still further scheme of the invention: the step 2) is carried out at a high speed for 15min, and the rotating speed is 900-1100 r/min.
As a still further scheme of the invention: and 3) grinding to fineness below 80um, and controlling the temperature of the material below 45 ℃.
As a still further scheme of the invention: and (3) the dispersion rotating speed of the dispersion tank in the step 4) is 600-700r/min, adding the defoaming agent and the flatting agent, stirring for 10min, adding the polytetrafluoroethylene emulsion, and stirring for 20 min.
As a still further scheme of the invention: the step 7) of adding the amide curing agent and the deionized water is carried out for stirring for 25min at the speed of 500-800 r/min.
As a still further scheme of the invention: the polytetrafluoroethylene emulsion is PTFE emulsion produced by SINO-RICH, and the PTFE concentrated dispersion liquid is polytetrafluoroethylene aqueous phase dispersion liquid containing nonionic surfactant.
Compared with the prior art, the invention has the beneficial effects that:
1. the water-based epoxy thick-paste petroleum steel pipe anticorrosive paint can provide a coating of 500-1000 um for one-time coating, is suitable for heavy-duty anticorrosive engineering, is a high-performance anticorrosive paint, and has the advantages of smooth, compact and hard coating, strong bonding force, strong chemical resistance, good salt and alkali resistance, seawater resistance, soil microbial corrosion resistance, plant rhizome penetrability resistance and the like.
2. The water-based epoxy thick-paste anticorrosive paint for the petroleum steel pipe has the advantages that the paint film of the paint is dried quickly, the surface is dried within 1.5 hours, the paint film is dried within 6 hours, the weather resistance is improved, and the aging resistance time is doubled compared with the paint which only adopts epoxy resin.
Detailed Description
Example one
The invention relates to a water-based epoxy thick paste petroleum steel pipe anticorrosive paint which comprises the following raw materials in parts by weight:
and (2) component A:
slurry preparation: 35 parts of epoxy resin, 15 parts of polytetrafluoroethylene emulsion, 8 parts of iron oxide red, 12 parts of anti-rust pigment, 10 parts of superfine barium sulfate, 8 parts of talcum powder, 2 parts of anti-settling agent, 0.9 part of defoaming agent, 0.9 part of flatting agent, 12 parts of glass beads and 10 parts of polyester fiber; 2 parts of a dispersing agent and 5 parts of deionized water.
Paint mixing:
35 parts of lacquer pulp, 5 parts of epoxy resin, 2 parts of propylene glycol methyl ether, 3 parts of thickening agent, 3 parts of wetting agent and 3 parts of reactive diluent (for toughening effect).
And (B) component: 15 parts of polyamide curing agent and 2 parts of deionized water, wherein the epoxy resin, the iron oxide red, the antirust pigment, the superfine barium sulfate, the talcum powder, the anti-settling agent, the defoaming agent and the flatting agent are raw materials contained in the conventional petroleum steel pipe anticorrosive coating, and in order to improve the coating dry paint speed, the anticorrosive performance, the hardness, the toughness, the coating smoothness, the resistance reduction and other performances of the petroleum steel pipe anticorrosive coating, the invention researches and reasonably adds the polytetrafluoroethylene emulsion, the polyester fiber and the glass beads, so that the coating dry paint speed, the anticorrosive performance, the hardness, the toughness, the coating smoothness, the resistance reduction and other performances of the petroleum steel pipe anticorrosive coating are obviously improved, and meanwhile, the anticorrosive paint meets the requirements on safety, environmental protection and national standards.
The preparation method of the water-based epoxy thick-paste anticorrosive paint for the petroleum steel pipe comprises the following steps;
the component A comprises:
weighing epoxy resin, polytetrafluoroethylene emulsion, iron oxide red, antirust pigment, superfine barium sulfate, talcum powder, anti-settling agent, defoaming agent, leveling agent, glass beads, polyester fiber, dispersing agent and deionized water according to the formula, and collecting the required formula raw materials according to the proportion for later use, wherein the polyamide curing agent is BF-7033 aqueous epoxy curing agent, the epoxy resin is BFTM-9056 aqueous epoxy resin, the leveling agent is VOK-SL 320A, the anti-settling agent is SD-2 of Haimines company, the anti-settling agent antirust pigment is aluminium dihydrogen tripolyphosphate, the defoaming agent is digao 902W, the leveling agent is VOK-SL 320A, and the dispersing agent is dispersant is VOK-SL 320A
9010S, wherein the thickening agent is RM-8W, the wetting agent is digao 270, the reactive diluent is AGE, and the polyamide curing agent is BF-7033, and the rest materials are left;
1) the epoxy resin, the defoaming agent, the leveling agent and the dispersing agent are put into a stainless steel dispersing tank and stirred for dispersion, wherein the dispersing agent is a surfactant which has two opposite properties of lipophilicity and hydrophilcity in a molecule, can uniformly disperse inorganic and organic pigment solid and liquid particles which are difficult to dissolve in liquid, and can prevent the particles from settling and coagulating to form an amphiphilic agent required by stable suspension liquid;
2) sequentially adding iron oxide red, an anti-rust pigment, superfine barium sulfate, talcum powder, an anti-settling agent, glass beads and polyester fibers, dispersing at a high speed, adding the anti-settling agent, wherein the anti-settling agent is a rheological control agent of a paint, so that the paint has thixotropy and greatly improved viscosity, simultaneously adding the glass beads and the polyester fibers, improving the hardness and toughness of a paint film by the polyester fibers, endowing the paint film with smoothness and reduced resistance by the glass beads, confirming that the pigment and the filler are fully wetted, and grinding in a grinder after the viscosity is moderate, so as to perform the subsequent grinding step;
3) grinding the materials for preparing the paint by a grinder and adding cooling water, fully grinding, stirring and dispersing the materials for preparing the paint by the grinder, controlling the grinding fineness and the material temperature of the paint in order to ensure that the fineness of the paint meets the specified standard and requirement, simultaneously playing a role of dispersing to form color paste, and packaging for later use;
4) adding the color paste obtained in the step 3) into a dispersion tank for dispersion, sequentially adding a defoaming agent and a flatting agent, stirring, and adding a polytetrafluoroethylene emulsion, wherein the polytetrafluoroethylene emulsion is added in the step, and endows the film with special effects of quick drying and improved corrosion resistance, and is uniformly stirred;
5) the mixed liquid color paste in the step 4) passes through a 100-mesh filter screen, the 100-mesh filter screen plays a role in purifying the coating, particles which do not accord with the standard after grinding are filtered out, the purification process is carried out, the component A is prepared by filtering and packaging, the whole paint mixing process is completed, and the preparation of the component A is completed.
The component B comprises:
6) weighing polyamide curing agent and deionized water according to the formula amount for later use, weighing, and determining the formula proportion;
7) in stainless steel disperse tank, add amide curing agent, deionized water sequentially, the curing agent is also called hardener, curing agent or mutagen, it is a kind of substance or mixture to promote or control the solidification reaction, resin solidification is through chemical reaction such as condensation, closed loop, addition, catalysis, etc., make the thermosetting resin produce the irreversible change process, solidify and finish through adding the curing (cross-linking) agent, the curing agent is the essential additive, no matter do it as adhesive, coating, pouring material all need to add the curing agent, otherwise the epoxy resin can not solidify, 100 mesh filter screen filters the package, purifies and packs;
8) according to the component A: the component B is 6: 1 (weight ratio), the misce bene, wherein, B component has the effect of improving A component solidification and drying rate, after both misce benes, can make mixed solution dry forming in 6 hours, according to SY/T5918-2011 bury ground steel pipeline outer anticorrosive coating and restore technical specification requirement, detect qualified.
In a preferred embodiment, in the step 1), the epoxy resin, the defoaming agent, the leveling agent and the dispersing agent are put into a stainless steel dispersion tank and stirred, the dispersion time is 10-15min, and the rotation speed is 600-700r/min, so that the dispersing agent can be optimally and fully exerted, and the sedimentation and agglomeration of particles can be prevented.
In a preferred embodiment, in the step 2), iron oxide red, an anti-rust pigment, ultrafine barium sulfate, talcum powder, an anti-settling agent, glass beads and polyester fibers are sequentially added, wherein the anti-settling agent has the effects of making the coating have thixotropy, greatly improving the viscosity, dispersing at a high speed for 15min, and rotating at a speed of 900-.
In a preferred embodiment, the step 3) is carried out for grinding to the fineness of below 80um, the grinding enables the fineness of the paint to reach the specified standard and requirement, meanwhile, the stirring and dispersing effects are also achieved, the temperature of the material is controlled to be below 45 ℃, and other reactions are prevented from occurring, and the grinding quality and efficiency are prevented from being affected.
In a preferred embodiment, the dispersion rotation speed of the dispersion tank in the step 4) is 600-700r/min, the defoaming agent and the leveling agent are added, stirring is carried out for 10min, the polytetrafluoroethylene emulsion is added, and stirring is carried out for 20min, so that the product in the step 4) is uniformly mixed with the defoaming agent, the leveling agent and the polytetrafluoroethylene emulsion.
In a preferred embodiment, the amide curing agent and the deionized water are added in the step 7) and stirred for 25min at the speed of 500-800r/min, after the weighing is completed, the amide curing agent and the deionized water are sequentially added into a stainless steel dispersion tank, stirred and dispersed, and then filtered and packaged by a 100-mesh filter screen, and are reserved for later use.
In a preferred embodiment, the polytetrafluoroethylene emulsion is a SINO-RICH PTFE emulsion, the PTFE concentrated dispersion is a polytetrafluoroethylene aqueous phase dispersion containing a nonionic surfactant, the appearance of the polytetrafluoroethylene aqueous phase dispersion is milky white or light yellow, the product has excellent thermal stability, outstanding chemical inertness, excellent electric insulation, low friction coefficient and excellent atmospheric aging resistance, and can be used at 260 ℃ for a long time, and the novel polytetrafluoroethylene dispersion can be used at 220 ℃ for a long time.
The working principle of the invention is as follows: the product is a water-soluble paint, the formulation is added with polytetrafluoroethylene emulsion, polyester fiber and glass beads besides the main existing raw materials, the polyester fiber and the glass beads are added in the step 2, the polyester fiber, commonly called as 'terylene', is a synthetic fiber obtained by spinning polyester formed by polycondensation of organic dibasic acid and dihydric alcohol, the synthetic fiber has high breaking strength and elastic modulus, moderate rebound resilience, excellent heat setting effect, good heat resistance and light resistance, and stable shape under wide end use conditions, and also has excellent impedance (such as organic solvent resistance, soap, detergent, bleaching solution and oxidant resistance) and better corrosion resistance, is stable to weak acid, alkali and the like, and is applicable to the water-soluble paint by processing, the glass beads are formed by high-tech processing of borosilicate raw materials, the particle size is 10-250 microns, the wall thickness is 1-2 microns, and the product has light weight, The surface of the epoxy thick paste oil steel pipe anticorrosive paint has oleophylic and hydrophobic properties after special treatment, is very easy to disperse in an organic material system, the glass microspheres are low in price, the toughness of plastics is enhanced, the rigidity of the plastic is not reduced, the melting point is high, the flame retardant property and the Vicat softening point of a filled object can be improved, the electric insulation property is good, the glass microspheres can be used for filling high-insulation polymers, the shrinkage rate of the filled object can be effectively reduced, the corrosion resistance is realized, the epoxy thick paste oil steel pipe anticorrosive paint is suitable for water-soluble paint and polytetrafluoroethylene emulsion through processing, has excellent thermal stability, outstanding chemical inertia, excellent electric insulation property, low friction coefficient and excellent atmospheric aging resistance, can be used for a long time at 260 ℃, and the novel polytetrafluoroethylene dispersion liquid can be used for a long time at 220 ℃, so that the aqueous epoxy thick paste oil steel pipe anticorrosive paint has the following effects when being coated outside a buried steel pipe, 1. meets the requirements of safety and environmental protection and national standard; 2. can provide a coating of 500um-1000um for one-time coating, and is suitable for heavy duty corrosion protection engineering; 3. the product is a high-performance anticorrosive coating, and the coating is smooth, compact and hard, and has strong bonding force, strong chemical resistance, good salt and alkali resistance, seawater resistance, soil microbial corrosion resistance, plant rhizome penetrability resistance and the like; 4. the coating film is dried quickly, the surface is dried for 1.5h, and the coating film is dried actually for 6 h; 5. improves the weather resistance, and prolongs the aging resistant time by one time compared with the coating which only adopts epoxy resin.
Example two
The water-based epoxy thick-paste anticorrosive paint for the petroleum steel pipe is characterized by comprising the following raw materials in parts by weight:
and (2) component A:
slurry preparation: 53 parts of epoxy resin, 14 parts of polytetrafluoroethylene emulsion, 10 parts of iron oxide red, 13 parts of anti-rust pigment, 24 parts of superfine barium sulfate, 12 parts of talcum powder, 5 parts of anti-settling agent, 2 parts of defoaming agent, 3 parts of flatting agent, 15 parts of glass microsphere and 12 parts of polyester fiber; 3 parts of a dispersing agent and 12 parts of deionized water.
Paint mixing:
48 parts of lacquer pulp, 12 parts of epoxy resin, 4 parts of propylene glycol methyl ether, 5 parts of thickening agent, 4 parts of wetting agent and 9 parts of reactive diluent (for toughening effect).
And (B) component: 18 parts of polyamide curing agent and 8 parts of deionized water.
The preparation method of the water-based epoxy thick-paste anticorrosive paint for the petroleum steel pipe comprises the following steps;
the component A comprises:
weighing epoxy resin, polytetrafluoroethylene emulsion, iron oxide red, antirust pigment, superfine barium sulfate, talcum powder, anti-settling agent, defoaming agent, leveling agent, glass beads, polyester fiber, dispersing agent and deionized water according to the formula, and collecting the required formula raw materials according to the proportion for later use, wherein the polyamide curing agent is BF-7033 aqueous epoxy curing agent, the epoxy resin is BFTM-9056 aqueous epoxy resin, the leveling agent is VOK-SL 320A, the anti-settling agent is SD-2 of Haimines company, the anti-settling agent antirust pigment is aluminium dihydrogen tripolyphosphate, the defoaming agent is digao 902W, the leveling agent is VOK-SL 320A, and the dispersing agent is dispersant is VOK-SL 320A
9010S, wherein the thickening agent is RM-8W, the wetting agent is digao 270, the reactive diluent is AGE, and the polyamide curing agent is BF-7033, and the rest materials are left;
1) the epoxy resin, the defoaming agent, the leveling agent and the dispersing agent are put into a stainless steel dispersing tank and stirred for dispersion, wherein the dispersing agent is a surfactant which has two opposite properties of lipophilicity and hydrophilcity in a molecule, can uniformly disperse inorganic and organic pigment solid and liquid particles which are difficult to dissolve in liquid, and can prevent the particles from settling and coagulating to form an amphiphilic agent required by stable suspension liquid;
2) sequentially adding iron oxide red, an anti-rust pigment, superfine barium sulfate, talcum powder, an anti-settling agent, glass beads and polyester fibers, dispersing at a high speed, adding the anti-settling agent, wherein the anti-settling agent is a rheological control agent of a paint, so that the paint has thixotropy and greatly improved viscosity, simultaneously adding the glass beads and the polyester fibers, improving the hardness and toughness of a paint film by the polyester fibers, endowing the paint film with smoothness and reduced resistance by the glass beads, confirming that the pigment and the filler are fully wetted, and grinding in a grinder after the viscosity is moderate, so as to perform the subsequent grinding step;
3) grinding the materials for preparing the paint by a grinder and adding cooling water, fully grinding, stirring and dispersing the materials for preparing the paint by the grinder, controlling the grinding fineness and the material temperature of the paint in order to ensure that the fineness of the paint meets the specified standard and requirement, simultaneously playing a role of dispersing to form color paste, and packaging for later use;
4) adding the color paste obtained in the step 3) into a dispersion tank for dispersion, sequentially adding a defoaming agent and a flatting agent, stirring, and adding a polytetrafluoroethylene emulsion, wherein the polytetrafluoroethylene emulsion is added in the step, and endows the film with special effects of quick drying and improved corrosion resistance, and is uniformly stirred;
5) the mixed liquid color paste in the step 4) passes through a 100-mesh filter screen, the 100-mesh filter screen plays a role in purifying the coating, particles which do not accord with the standard after grinding are filtered out, the purification process is carried out, the component A is prepared by filtering and packaging, the whole paint mixing process is completed, and the preparation of the component A is completed.
The component B comprises:
6) weighing polyamide curing agent and deionized water according to the formula amount for later use, weighing, and determining the formula proportion;
7) in stainless steel disperse tank, add amide curing agent, deionized water sequentially, the curing agent is also called hardener, curing agent or mutagen, it is a kind of substance or mixture to promote or control the solidification reaction, resin solidification is through chemical reaction such as condensation, closed loop, addition, catalysis, etc., make the thermosetting resin produce the irreversible change process, solidify and finish through adding the curing (cross-linking) agent, the curing agent is the essential additive, no matter do it as adhesive, coating, pouring material all need to add the curing agent, otherwise the epoxy resin can not solidify, 100 mesh filter screen filters the package, purifies and packs;
8) according to the component A: the component B is 6: 1 (weight ratio), the mixture is uniform, the component B has the function of improving the solidification and drying speed of the component A, when the component A and the component B are uniformly mixed, the mixed liquid can be dried and formed within 6h, and the detection is qualified according to the technical specification requirement of SY/T5918-2011 buried steel pipeline outer anticorrosive coating repair.
In a preferred embodiment, in the step 1), the epoxy resin, the defoaming agent, the leveling agent and the dispersing agent are put into a stainless steel dispersion tank and stirred, the dispersion time is 10-15min, and the rotation speed is 600-700r/min, so that the dispersing agent can be optimally and fully exerted, and the sedimentation and agglomeration of particles can be prevented.
In a preferred embodiment, in the step 2), iron oxide red, an anti-rust pigment, ultrafine barium sulfate, talcum powder, an anti-settling agent, glass beads and polyester fibers are sequentially added, wherein the anti-settling agent has the effects of making the coating have thixotropy, greatly improving the viscosity, dispersing at a high speed for 15min, and rotating at a speed of 900-.
In a preferred embodiment, the step 3) is carried out for grinding to the fineness of below 80um, the grinding enables the fineness of the paint to reach the specified standard and requirement, meanwhile, the stirring and dispersing effects are also achieved, the temperature of the material is controlled to be below 45 ℃, and other reactions are prevented from occurring, and the grinding quality and efficiency are prevented from being affected.
In a preferred embodiment, the dispersion rotation speed of the dispersion tank in the step 4) is 600-700r/min, the defoaming agent and the leveling agent are added, stirring is carried out for 10min, the polytetrafluoroethylene emulsion is added, and stirring is carried out for 20min, so that the product in the step 4) is uniformly mixed with the defoaming agent, the leveling agent and the polytetrafluoroethylene emulsion.
In a preferred embodiment, the amide curing agent and the deionized water are added in the step 7) and stirred for 25min at the speed of 500-800r/min, after the weighing is completed, the amide curing agent and the deionized water are sequentially added into a stainless steel dispersion tank, stirred and dispersed, and then filtered and packaged by a 100-mesh filter screen, and are reserved for later use.
In a preferred embodiment, the polytetrafluoroethylene emulsion is a SINO-RICH PTFE emulsion, the PTFE concentrated dispersion is a polytetrafluoroethylene aqueous phase dispersion containing a nonionic surfactant, the appearance of the polytetrafluoroethylene aqueous phase dispersion is milky white or light yellow, the product has excellent thermal stability, outstanding chemical inertness, excellent electric insulation, low friction coefficient and excellent atmospheric aging resistance, and can be used at 260 ℃ for a long time, and the novel polytetrafluoroethylene dispersion can be used at 220 ℃ for a long time.
The working principle of the invention is as follows: in the embodiment, the component A comprises 53 parts of epoxy resin, 14 parts of polytetrafluoroethylene emulsion, 10 parts of iron oxide red, 13 parts of antirust pigment, 24 parts of superfine barium sulfate, 12 parts of talcum powder, 5 parts of anti-settling agent, 2 parts of defoaming agent, 3 parts of flatting agent, 15 parts of glass beads and 12 parts of polyester fiber; 3 parts of a dispersing agent, 12 parts of deionized water, and paint mixing: 48 parts of lacquer pulp, 12 parts of epoxy resin, 4 parts of propylene glycol methyl ether, 5 parts of thickening agent, 4 parts of wetting agent and 9 parts of reactive diluent (for toughening effect), wherein the component B is as follows: 18 parts of polyamide curing agent and 8 parts of deionized water, wherein the proportion is changed, the relative performance of the product is reduced along with the reduction of the proportion of the polytetrafluoroethylene emulsion, the relative performance of the product is improved along with the increase of the proportion of the glass beads and the polyester fibers, and simultaneously the proportion of other raw materials is changed along with the change of the proportion of the other raw materials, so that the selection of the raw materials such as the polytetrafluoroethylene emulsion, the polyester fibers, the glass beads and the like and the increase and decrease of other raw materials are reasonably compatible, the polyamide curing agent has uniqueness, meanwhile, the change range of the consumption of all the raw materials is within the qualified range, the performance of a coating after paint preparation is within the qualified range, and the detection result is qualified.
It should be noted that the above embodiments belong to the same inventive concept, and the description of each embodiment has a different emphasis, and reference may be made to the description in other embodiments where the description in individual embodiments is not detailed.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. The water-based epoxy thick-paste anticorrosive paint for the petroleum steel pipe is characterized by comprising the following raw materials in parts by weight:
and (2) component A:
slurry preparation: 25-55 parts of epoxy resin, 10-30 parts of polytetrafluoroethylene emulsion, 2-12 parts of iron oxide red, 4-14 parts of antirust pigment, 8-25 parts of superfine barium sulfate, 5-15 parts of talcum powder, 1-6 parts of anti-settling agent, 0.1-2 parts of defoaming agent, 0.1-3 parts of flatting agent, 1-20 parts of glass beads and 1-15 parts of polyester fiber; 0.4-4 parts of dispersing agent and 2-20 parts of deionized water.
Paint mixing:
30-60 parts of lacquer pulp, 5-15 parts of epoxy resin, 1-10 parts of propylene glycol methyl ether, 1-10 parts of thickening agent, 1-10 parts of wetting agent and 2-10 parts of reactive diluent.
And (B) component: 10-30 parts of polyamide curing agent and 1-10 parts of deionized water.
2. The preparation method of the water-based epoxy thick-paste anticorrosive paint for the petroleum steel pipe comprises the following steps;
the component A comprises:
weighing epoxy resin, polytetrafluoroethylene emulsion, iron oxide red, anti-rust pigment, superfine barium sulfate, talcum powder, anti-settling agent, defoaming agent, leveling agent, glass beads, polyester fiber, dispersing agent and deionized water according to the formula ratio for later use;
1) putting epoxy resin, a defoaming agent, a flatting agent and a dispersing agent into a stainless steel dispersion tank, and stirring and dispersing;
2) then sequentially adding iron oxide red, antirust pigment, superfine barium sulfate, talcum powder, anti-settling agent, glass beads and polyester fiber, dispersing at a high speed, confirming that the pigment and the filler are fully wetted and the viscosity is moderate, and then grinding in a grinder;
3) grinding with a grinder and cooling water, controlling grinding fineness and material temperature to form color paste, and packaging for later use;
4) adding the color paste obtained in the step 3) into a dispersion tank for dispersion, sequentially adding a defoaming agent and a leveling agent, stirring, adding a polytetrafluoroethylene emulsion, and stirring;
5) and (3) filtering and packaging the mixed liquid color paste obtained in the step 4) by using a 100-mesh filter screen to obtain the component A.
The component B comprises:
6) weighing polyamide curing agent and deionized water according to the formula ratio for later use;
7) sequentially adding an amide curing agent and deionized water into a stainless steel dispersion tank, and filtering and packaging by using a 100-mesh filter screen;
8) according to the component A: the component B is 6: 1 (weight ratio) and mixing uniformly.
3. The preparation method of the water-based epoxy thick-paste petroleum steel pipe anticorrosive paint according to claim 2, characterized in that the stirring dispersion time in the step 1) is 10-15min, and the rotation speed is 600-700 r/min.
4. The preparation method of the water-based epoxy thick-paste petroleum steel pipe anticorrosive paint according to claim 2, characterized in that the step 2) is performed at a high speed of 15min and a rotation speed of 900-.
5. The preparation method of the water-based epoxy thick paste petroleum steel pipe anticorrosive paint according to claim 2, characterized in that the step 3) is carried out until the fineness is below 80um, and the temperature of the materials is controlled below 45 ℃.
6. The preparation method of the water-based epoxy thick paste petroleum steel pipe anticorrosive paint according to claim 2, characterized in that the dispersion rotation speed of the dispersion tank in the step 4) is 600-.
7. The preparation method of the water-based epoxy thick-paste petroleum steel pipe anticorrosive paint according to claim 2, characterized in that the amide curing agent and the deionized water are added in the step 7) and stirred for 25min at the speed of 500-800 r/min.
8. The method for preparing the aqueous epoxy mastic petroleum steel pipe anticorrosive paint according to claims 1-2, characterized in that the polytetrafluoroethylene emulsion is a PTFE emulsion produced by SINO-RICH, and the PTFE concentrated dispersion is a polytetrafluoroethylene aqueous phase dispersion containing a nonionic surfactant.
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Application publication date: 20211119 |