CN112480797A - Anticorrosive polyurea coating for petrochemical industry and preparation method thereof - Google Patents

Anticorrosive polyurea coating for petrochemical industry and preparation method thereof Download PDF

Info

Publication number
CN112480797A
CN112480797A CN202011333992.1A CN202011333992A CN112480797A CN 112480797 A CN112480797 A CN 112480797A CN 202011333992 A CN202011333992 A CN 202011333992A CN 112480797 A CN112480797 A CN 112480797A
Authority
CN
China
Prior art keywords
component
petrochemical industry
layered material
polyurea coating
coupling agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011333992.1A
Other languages
Chinese (zh)
Inventor
王宝柱
苏坤
黄黎辉
岳长山
刘晓文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Air++ New Materials Co ltd
Original Assignee
Qingdao Air++ New Materials Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Air++ New Materials Co ltd filed Critical Qingdao Air++ New Materials Co ltd
Priority to CN202011333992.1A priority Critical patent/CN112480797A/en
Publication of CN112480797A publication Critical patent/CN112480797A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/02—Polyureas
    • 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
    • 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
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • 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
    • 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
    • C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
    • C08K2003/3009—Sulfides
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention provides an anticorrosive polyurea coating for petrochemical industry and a preparation method thereof, wherein the anticorrosive polyurea coating comprises a component A and a component B, wherein the component A comprises the following raw materials: polydopamine modified two-dimensional layered material, polyol and polyisocyanate; the component B comprises the following raw materials: amine-terminated polyether, polyol, coupling agent and the like. The anti-corrosion polyurea coating contains a polydopamine modified two-dimensional layered material, the chemical structure of the polydopamine contains the naphthol, the adhesion to a metal base material (such as a steel plate) is strong, catechol hydroxyl in the polydopamine has a strong complexing effect on metal ions, and the anti-corrosion capability is improved by enhancing the adhesion and forming a nano layer; the two-dimensional layered material has large development area and small using amount, can be uniformly distributed on the polyurea body by modifying polydopamine, fully exerts the performance of the two-dimensional layered material, and improves the adhesive force and the corrosion resistance of the polyurea while keeping the excellent physical performance of the polyurea.

Description

Anticorrosive polyurea coating for petrochemical industry and preparation method thereof
Technical Field
The invention relates to the technical field of polyurea coatings, in particular to an anticorrosive polyurea coating for petrochemical industry and a preparation method thereof.
Background
In the field of corrosion prevention of petroleum, chemical engineering, pipelines, ocean engineering and the like, most of equipment and pipelines are corroded due to the existence of corrosive media, and the concentration and the temperature of the corrosive media change at any time, so that the corrosion is very serious. The covering layer or lining made of various anticorrosive materials can completely isolate metal equipment from corrosive medium, prevent the corrosion and abrasion of the equipment, improve the corrosion resistance, wear resistance and safety of the equipment and prolong the service life.
The heavy-duty anticorrosive material is an anticorrosive material which can be used in a severe corrosive environment for a long time, and the service life of the heavy-duty anticorrosive material is generally more than 15 years. The traditional heavy-duty anticorrosive material has epoxy, polyurethane, glass fiber reinforced plastic, rubber, plastic and other varieties, obtains better effect in practical application, but still has the defects of poor anticorrosive performance, environmental pollution, easy leakage of joints, complex construction and the like. Research in recent years shows that the spray polyurea coating integrates the characteristics of excellent corrosion resistance, quick construction performance, no pollution to the environment, no seam on the whole spray construction coating film and the like, and has been increasingly widely applied in the fields of petroleum, chemical storage tanks, steel structure corrosion prevention, sewage treatment pools and the like, but the commonly used spray polyurea coating has poor organic solvent corrosion resistance, and the application of the spray polyurea coating in some fields is limited.
The prior art discloses a heavy-duty spray polyurea coating which is composed of A, B bi-components, wherein the component A is composed of 60-80 parts by weight of isocyanate and 20-40 parts by weight of polyol; the component B comprises 40-70 parts by weight of liquid polysulfide rubber, 20-50 parts by weight of liquid amine chain extender, 0-10 parts by weight of pigment and filler and 0-10 parts by weight of auxiliary agent. However, the liquid polysulfide rubber has low tensile strength and elongation, poor aging resistance and bad odor, and the polysulfide-modified polyurea using the reaction of mercapto group and isocyanate reduces the polyurea tensile strength and aging resistance.
Based on the technical defects of the existing heavy-duty spray polyurea coating, the improvement is needed.
Disclosure of Invention
In view of the above, the invention provides an anticorrosive polyurea coating for petrochemical industry and a preparation method thereof, which at least partially solve the technical problems in the prior art.
In a first aspect, the invention provides an anticorrosive polyurea coating for petrochemical industry, which comprises a component A and a component B, wherein the component A comprises the following raw materials: polydopamine modified two-dimensional layered material, polyol and polyisocyanate; the component B comprises the following raw materials: amino-terminated polyether, polyol, a coupling agent, a chain extender, a catalyst, a water removing agent and color paste.
Optionally, the preparation method of the polydopamine modified two-dimensional layered material for the anticorrosive polyurea coating in the petrochemical industry comprises the following steps: dispersing the two-dimensional layered material into an ethanol solution, adding a trihydroxymethyl aminomethane buffer solution, performing ultrasonic dispersion, adding dopamine hydrochloride, mixing and stirring, and performing centrifugal separation to obtain the polydopamine modified two-dimensional layered material.
Optionally, the two-dimensional layered material comprises molybdenum disulfide and/or tungsten disulfide.
Optionally, the polyurea coating for corrosion prevention in petrochemical industry, the polyol comprises one or more of polyoxypropylene glycol, polytetrahydrofuran ether glycol, polycaprolactone glycol, polyester glycol and polycarbonate glycol;
and/or the polyisocyanate comprises one or more of diphenylmethane diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, methylcyclohexyl diisocyanate, cyclohexanedimethylene isocyanate, xylylene diisocyanate and 1, 4-cyclohexanediisocyanate;
and/or the amino-terminated polyether comprises a difunctional amino-terminated polyether and/or a trifunctional amino-terminated polyether;
and/or the coupling agent comprises one or more of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, a borate coupling agent, a bimetallic coupling agent and a phosphate coupling agent;
and/or the chain extender comprises one or more of 3, 5-dimethylthiotoluenediamine, 2, 4-diamino-3, 5-dimethylthiochlorobenzene, 4 '-bis-sec-butylaminodiphenylmethane, N, -dialkylphenylenediamine, 2, 4-diamino-3-methylthio-5-propyltoluene, 3' -dimethyl-4, 4 '-diaminodicyclohexylmethane, 4' -bis-sec-butylaminodicyclohexylmethane, 3 '-dimethyl-4, 4' -bis-sec-butylamino-dicyclohexylmethane, trimethylhexamethylenediamine and hydrogenated MDA;
and/or the catalyst comprises one or more of bismuth isooctanoate, zinc isooctanoate, triethylene diamine, dimorpholinyl diethyl ether, tetrabutyl titanate and tetraisopropyl titanate;
and/or, the water scavenger comprises a molecular sieve.
Optionally, the tris buffer solution is used for anticorrosive polyurea coating in petrochemical industry, and the pH value of the tris buffer solution is 6-9.
Optionally, the mass ratio of the two-dimensional layered material to the dopamine hydrochloride is (2-4) to (1-2);
the mass ratio of the polyol to the polyisocyanate in the component A is 100 (150-250);
the component B comprises the amino-terminated polyether, polyol, a coupling agent, a chain extender, a catalyst, a water removing agent and color paste in a mass ratio of (30-60) to (20-50) to (1-2) to (20-40) to (0-1) to (1-5).
Optionally, the average molecular weight of the polyol is 400-1500.
In a second aspect, the invention also provides a preparation method of the anticorrosive polyurea coating for the petrochemical industry, which comprises the preparation of the component A and the preparation of the component B, wherein the preparation of the component A comprises the following steps:
stirring and heating polyhydric alcohol for dehydration, adding polyisocyanate for reaction, adding polydopamine modified two-dimensional layered material for continuous reaction to obtain a component A;
the preparation of the component B comprises the following steps: and stirring and mixing the amino-terminated polyether, the polyol, the coupling agent, the chain extender, the catalyst, the water removing agent and the color paste to obtain the component B.
Optionally, in the preparation method of the anticorrosive polyurea coating for the petrochemical industry, under vacuum negative pressure, the polyol is heated to 95-195 ℃, dehydrated for 5-7 hours, vacuumized, cooled to below 50 ℃, added with the polyisocyanate, heated to 90-95 ℃ for reaction for 3-4 hours, added with the polydopamine modified two-dimensional layered material, and continuously reacted for 1-2 hours to obtain the component A.
Optionally, in the preparation method of the anticorrosive polyurea coating for the petrochemical industry, the NCO content of the component A is 14-17% by mass, and the isocyanate index of the component A and the isocyanate index of the component B are 1.05-1.10.
Compared with the prior art, the anticorrosive polyurea coating for the petrochemical industry and the preparation method thereof have the following beneficial effects:
(1) the invention relates to an anticorrosive polyurea coating for petrochemical industry, which contains a polydopamine modified two-dimensional layered material, wherein the chemical structure of the polydopamine contains naphthalocenol, the polydopamine has strong adhesive force to metal substrates (such as steel plates), and catechol hydroxyl in the polydopamine is opposite to metal ions, such as: divalent or trivalent iron ions have strong complexing effect, and the corrosion resistance is improved by enhancing the adhesive force and forming a nano layer; meanwhile, the polydopamine contains amino groups which can react with isocyanate to increase the crosslinking density of polyurea, and a large number of organic functional groups contained in the polydopamine enhance the compatibility of molybdenum disulfide and polyurea interfaces, so that the dispersibility of the molybdenum disulfide in the polyurea is improved, and the uniform dispersion of the molybdenum disulfide in a coating is ensured to fully exert the barrier effect of the molybdenum disulfide; the two-dimensional nano material molybdenum disulfide and tungsten disulfide have a lamellar structure, the lamellar structure can cover the surface of a coating to form a micro-nano layer, the corrosion resistance and the hydrophobicity of the coating are improved, meanwhile, the two-dimensional layered material is large in unfolded area and small in using amount, can be uniformly distributed on a polyurea body through poly-dopamine modification, fully exerts the performance of the two-dimensional layered material, and improves the adhesive force and the corrosion resistance of the polyurea while keeping the excellent physical performance of the polyurea. Although the two-dimensional layered material is a powder substance, the addition amount is small, so that the physical properties and the spraying efficiency of polyurea are not influenced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
An anticorrosive polyurea coating for petrochemical industry comprises a component A and a component B, wherein the component A comprises the following raw materials: polydopamine modified two-dimensional layered material, polyol and polyisocyanate; the component B comprises the following raw materials: amino-terminated polyether, polyol, a coupling agent, a chain extender, a catalyst, a water removing agent and color paste.
The preparation method of the polydopamine modified two-dimensional layered material in the embodiment of the present application is as follows: dispersing the two-dimensional layered material into an ethanol solution, adding a trihydroxymethyl aminomethane buffer solution, performing ultrasonic dispersion, adding dopamine hydrochloride, mixing and stirring, performing centrifugal separation, washing and drying to obtain the polydopamine modified two-dimensional layered material.
Specifically, in the embodiment of the present application, the two-dimensional layered material includes molybdenum disulfide and/or tungsten disulfide.
Specifically, the polyol in the embodiment of the present application includes one or more of polyoxypropylene glycol, polytetrahydrofuran ether glycol, polycaprolactone glycol, polyester glycol, and polycarbonate glycol; the average molecular weight of the polyhydric alcohol is 400-1500, the water content is less than or equal to 0.5%, and the acid value is less than or equal to 0.8mg KOH/g.
Specifically, the polyisocyanate in the embodiment of the present application includes one or more of diphenylmethane diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, methylcyclohexyl diisocyanate, cyclohexanedimethylene diisocyanate, xylylene diisocyanate, and 1, 4-cyclohexanediisocyanate.
Specifically, the amino-terminated polyether in the embodiment of the present application includes a di-functional amino-terminated polyether and/or a tri-functional amino-terminated polyether.
Specifically, in the embodiment of the present application, the coupling agent includes one or more of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, a borate coupling agent, a bimetallic coupling agent, and a phosphate coupling agent.
Specifically, the chain extender in the embodiment of the present application includes one or more of 3, 5-dimethylthiotoluenediamine, 2, 4-diamino-3, 5-dimethylthiochlorobenzene, 4 '-bis-sec-butylaminodiphenylmethane, N, -dialkylphenylenediamine, 2, 4-diamino-3-methylthio-5-propyltoluene, 3' -dimethyl-4, 4 '-diaminodicyclohexylmethane, 4' -bis-sec-butylaminodicyclohexylmethane, 3 '-dimethyl-4, 4' -bis-sec-butylaminodicyclohexylmethane, trimethylhexamethylenediamine, and hydrogenated MDA.
Specifically, the catalyst in the embodiment of the present application includes one or more of bismuth isooctanoate, zinc isooctanoate, triethylene diamine, dimorpholinodiethyl ether, tetrabutyl titanate, and tetraisopropyl titanate.
Specifically, the water scavenger in the embodiment of the present application includes a molecular sieve, and the specification of the molecular sieve is 3A or 4A.
Specifically, the pH value of the tris buffer solution in the embodiment of the application is 6-9.
Specifically, the color paste in the embodiment of the application is a color paste universal for the polyurethane industry, and the color of the color paste comprises: red, yellow, blue, green, white and black color pastes, the water content of which is less than or equal to 0.5 percent.
Specifically, the mass ratio of the two-dimensional layered material to the dopamine hydrochloride in the embodiment of the application is (2-4): 1-2;
the mass ratio of the polyol of the component A to the polyisocyanate is 100 (150-250);
the component B comprises the amino-terminated polyether, polyol, a coupling agent, a chain extender, a catalyst, a water removing agent and color paste in a mass ratio of (30-60) to (20-50) to (1-2) to (20-40) to (0-1) to (1-5).
The following further illustrates, in specific examples, the preparation of the polyurea-coating compositions according to the present application.
A preparation method of an anticorrosive polyurea coating used in petrochemical industry comprises the preparation of a component A and the preparation of a component B, wherein,
the preparation of the component A comprises the following steps:
s1, adding 2 parts by weight of molybdenum disulfide into 50 parts by weight of ethanol solution, performing ultrasonic dispersion for 0.5h, then adding a trihydroxymethyl aminomethane buffer solution with the pH value of 8, performing ultrasonic treatment for 1h, then adding 1 part by weight of dopamine hydrochloride, stirring for 6h at the temperature of 60 ℃, then centrifuging for 10min at 5000rpm, washing the precipitate with ethanol-water solution for three times, and performing vacuum drying on the precipitate at the temperature of 60 ℃ for 12h to prepare polydopamine modified molybdenum disulfide, and sealing and storing the polydopamine modified molybdenum disulfide in an inert environment for later use;
s2, heating 100 parts by weight of polytetrahydrofuran ether glycol PTMEG1000 under vacuum-0.1 MPa to 110 ℃ for 5 hours, releasing the vacuum, cooling to 45 ℃, adding 200 parts by weight of 4,4' -diphenylmethane diisocyanate (MDI-50), reacting at 90 ℃ for 4 hours, adding the polydopamine modified molybdenum disulfide prepared in S1, continuing to react for 2 hours, and after the reaction is finished, determining that the-NCO value is 14%, and discharging to obtain the component A.
The preparation of the component B comprises the following steps: the preparation method comprises the following steps of sequentially putting 30 parts by weight of amino-terminated polyether D2000, 20 parts by weight of polytetrahydrofuran ether glycol PTMEG1000, 2 parts by weight of silane coupling agent A171, 35 parts by weight of chain extender E100, 0.1 part by weight of catalyst bismuth isooctanoate, 5 parts by weight of 3A molecular sieve and 1 part by weight of black color paste into a storage tank of a high-speed dispersion machine, stirring for 30min at room temperature, grinding by a sand mill until the fineness is qualified, and filtering by a 200-mesh copper filter screen to obtain the component B.
When the anticorrosive polyurea coating for the petrochemical industry is used, the component A and the component B in the volume ratio of 1:1 are uniformly mixed by a spraying machine and then sprayed on the surface of a used sample.
The application discloses an anticorrosive polyurea coating for petrochemical industry contains polydopamine modified molybdenum disulfide or polydopamine modified tungsten disulfide, contains naphthalene tea phenol in the chemical structure of polydopamine, has very strong adhesive force to metal substrate (such as steel sheet), and pyrocatechol hydroxyl in the polydopamine is to metal ion, if: divalent or trivalent iron ions have strong complexing effect, and the corrosion resistance is improved by enhancing the adhesive force and forming a nano layer; meanwhile, the polydopamine contains amino groups which can react with isocyanate to increase the crosslinking density of polyurea, and a large number of organic functional groups contained in the polydopamine enhance the compatibility of molybdenum disulfide and polyurea interfaces, so that the dispersibility of the molybdenum disulfide in the polyurea is improved, and the uniform dispersion of the molybdenum disulfide in a coating is ensured to fully exert the barrier effect of the molybdenum disulfide; the two-dimensional nano material molybdenum disulfide and tungsten disulfide have a lamellar structure, the lamellar structure can cover the surface of a coating to form a micro-nano layer, the corrosion resistance and the hydrophobicity of the coating are improved, meanwhile, the two-dimensional layered material is large in unfolded area and small in using amount, can be uniformly distributed on a polyurea body through poly-dopamine modification, fully exerts the performance of the two-dimensional layered material, and improves the adhesive force and the corrosion resistance of the polyurea while keeping the excellent physical performance of the polyurea. Although the two-dimensional layered material is a powder substance, the addition amount is small, so that the physical properties and the spraying efficiency of polyurea are not influenced. The polyurea coating for corrosion prevention in petrochemical industry prepared by the method can be used as a heavy-duty anticorrosive material to be applied to severe corrosion environments such as petroleum, chemical engineering, pipelines, ocean engineering and the like.
Example 2
A preparation method of an anticorrosive polyurea coating used in petrochemical industry comprises the preparation of a component A and the preparation of a component B, wherein,
the preparation of the component A comprises the following steps:
s1, adding 4 parts by weight of molybdenum disulfide into 50 parts by weight of ethanol solution, performing ultrasonic dispersion for 0.5h, then adding a trihydroxymethyl aminomethane buffer solution with the pH value of 7.5, performing ultrasonic treatment for 1h, then adding 2 parts by weight of dopamine hydrochloride, stirring for 6h at 60 ℃, then centrifuging for 5min at 5000rpm, washing the precipitate with ethanol-water solution for three times, and performing vacuum drying on the precipitate at 60 ℃ for 12h to prepare polydopamine modified molybdenum disulfide, and sealing for later use in an inert environment;
s2, heating 100 parts by weight of polytetrahydrofuran ether glycol PTMEG1000 under vacuum-0.1 MPa to 110 ℃ for 5 hours, releasing the vacuum, cooling to 45 ℃, adding 200 parts by weight of 4,4' -diphenylmethane diisocyanate (MDI-50), reacting at 90 ℃ for 4 hours, adding the polydopamine modified molybdenum disulfide prepared in S1, continuing to react for 2 hours, and after the reaction is finished, determining that the-NCO value is 16%, and discharging to obtain the component A.
The preparation of the component B comprises the following steps: the component B is prepared by putting 50 parts by weight of amino-terminated polyether D2000, 20 parts by weight of polytetrahydrofuran ether glycol PTMEG650, 1 part by weight of titanate coupling agent KR-TTS, 20 parts by weight of chain extender 4,4' -bis-sec-butylaminodiphenylmethane, 0.5 part by weight of catalyst bismuth isooctanoate, 1 part by weight of 4A molecular sieve and 4 parts by weight of black color paste into a high-speed dispersion machine storage tank in sequence, stirring for 15min at room temperature, grinding by a sand mill until the fineness is qualified, and filtering by a 200-mesh copper filter screen.
When the anticorrosive polyurea coating for the petrochemical industry is used, the component A and the component B in the volume ratio of 1:1 are uniformly mixed by a spraying machine and then sprayed on the surface of a used sample.
The component A and the component B prepared in the above examples 1-2 are uniformly mixed by a spraying machine according to the volume ratio of 1:1, and then the mixture is sprayed on the surface of a steel plate to obtain a coating, the coating is placed in an environment with the temperature of (25 +/-2) DEG C and the humidity of (50 +/-5%), and after curing for 7 days, the test performance is shown in the following table 1.
TABLE 1-Properties of coatings for petrochemical industry anti-corrosive polyurea coatings prepared in examples 1-2
Inspection item Example 1 Example 2
Drawing strength ≥10.5Mpa ≥12Mpa
Alternating current impedance | Z |0.01Hz ≥1×1010Ωcm2 ≥1×1010Ωcm2
Tensile strength (Mpa) 18 17
Elongation at Break (%) 300 300
Tear Strength (N/mm) 80 80
As can be seen from Table 1, the anticorrosive polyurea coating for the petrochemical industry prepared by the invention has good adhesion with a steel plate, and the coating formed by the anticorrosive polyurea coating for the petrochemical industry prepared by the invention has good mechanical property and good corrosion resistance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. An anticorrosive polyurea coating for petrochemical industry is characterized in that: the paint comprises a component A and a component B, wherein the component A comprises the following raw materials: polydopamine modified two-dimensional layered material, polyol and polyisocyanate; the component B comprises the following raw materials: amino-terminated polyether, polyol, a coupling agent, a chain extender, a catalyst, a water removing agent and color paste.
2. An anticorrosive polyurea coating for petrochemical industry according to claim 1, wherein: the preparation method of the polydopamine modified two-dimensional layered material comprises the following steps: dispersing the two-dimensional layered material into an ethanol solution, adding a trihydroxymethyl aminomethane buffer solution, performing ultrasonic dispersion, adding dopamine hydrochloride, mixing and stirring, and performing centrifugal separation to obtain the polydopamine modified two-dimensional layered material.
3. An anticorrosive polyurea coating for petrochemical industry according to claim 1, wherein: the two-dimensional layered material comprises molybdenum disulfide and/or tungsten disulfide.
4. An anticorrosive polyurea coating for petrochemical industry according to claim 1, wherein: the polyalcohol comprises one or more of polyoxypropylene diol, polytetrahydrofuran ether diol, polycaprolactone diol, polyester diol and polycarbonate diol;
and/or the polyisocyanate comprises one or more of diphenylmethane diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, methylcyclohexyl diisocyanate, cyclohexanedimethylene isocyanate, xylylene diisocyanate and 1, 4-cyclohexanediisocyanate;
and/or the amino-terminated polyether comprises a difunctional amino-terminated polyether and/or a trifunctional amino-terminated polyether;
and/or the coupling agent comprises one or more of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, a borate coupling agent, a bimetallic coupling agent and a phosphate coupling agent;
and/or the chain extender comprises one or more of 3, 5-dimethylthiotoluenediamine, 2, 4-diamino-3, 5-dimethylthiochlorobenzene, 4 '-bis-sec-butylaminodiphenylmethane, N, -dialkylphenylenediamine, 2, 4-diamino-3-methylthio-5-propyltoluene, 3' -dimethyl-4, 4 '-diaminodicyclohexylmethane, 4' -bis-sec-butylaminodicyclohexylmethane, 3 '-dimethyl-4, 4' -bis-sec-butylamino-dicyclohexylmethane, trimethylhexamethylenediamine and hydrogenated MDA;
and/or the catalyst comprises one or more of bismuth isooctanoate, zinc isooctanoate, triethylene diamine, dimorpholinyl diethyl ether, tetrabutyl titanate and tetraisopropyl titanate;
and/or, the water scavenger comprises a molecular sieve.
5. An anticorrosive polyurea coating for petrochemical industry according to claim 2, wherein: the pH value of the tris buffer solution is 6-9.
6. An anticorrosive polyurea coating for petrochemical industry according to claim 2, wherein: the mass ratio of the two-dimensional layered material to the dopamine hydrochloride is (2-4) to (1-2);
the mass ratio of the polyol to the polyisocyanate in the component A is 100 (150-250);
the component B comprises the amino-terminated polyether, polyol, a coupling agent, a chain extender, a catalyst, a water removing agent and color paste in a mass ratio of (30-60) to (20-50) to (1-2) to (20-40) to (0-1) to (1-5).
7. An anticorrosive polyurea coating for petrochemical industry according to claim 1, wherein: the average molecular weight of the polyol is 400-1500.
8. A preparation method of the anticorrosive polyurea coating for petrochemical industry according to any one of claims 1 to 7, characterized by comprising the following steps: the preparation method comprises the preparation of a component A and the preparation of a component B, wherein the preparation of the component A comprises the following steps:
stirring and heating polyhydric alcohol for dehydration, adding polyisocyanate for reaction, adding polydopamine modified two-dimensional layered material for continuous reaction to obtain a component A;
the preparation of the component B comprises the following steps: and stirring and mixing the amino-terminated polyether, the polyol, the coupling agent, the chain extender, the catalyst, the water removing agent and the color paste to obtain the component B.
9. The method for preparing an anticorrosive polyurea coating for petrochemical industry according to claim 8, wherein: heating the polyhydric alcohol to 95-195 ℃ under vacuum negative pressure, dehydrating for 5-7 h, relieving vacuum, cooling to below 50 ℃, adding polyisocyanate, heating to 90-95 ℃ for reaction for 3-4 h, adding polydopamine modified two-dimensional layered material, and continuing to react for 1-2 h to obtain the component A.
10. The method for preparing an anticorrosive polyurea coating for petrochemical industry according to claim 9, wherein: the mass content of NCO in the component A is 14-17%; the isocyanate index of the component A and the isocyanate index of the component B are 1.05-1.10.
CN202011333992.1A 2020-11-25 2020-11-25 Anticorrosive polyurea coating for petrochemical industry and preparation method thereof Pending CN112480797A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011333992.1A CN112480797A (en) 2020-11-25 2020-11-25 Anticorrosive polyurea coating for petrochemical industry and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011333992.1A CN112480797A (en) 2020-11-25 2020-11-25 Anticorrosive polyurea coating for petrochemical industry and preparation method thereof

Publications (1)

Publication Number Publication Date
CN112480797A true CN112480797A (en) 2021-03-12

Family

ID=74933990

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011333992.1A Pending CN112480797A (en) 2020-11-25 2020-11-25 Anticorrosive polyurea coating for petrochemical industry and preparation method thereof

Country Status (1)

Country Link
CN (1) CN112480797A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110982402A (en) * 2019-12-24 2020-04-10 青岛爱尔家佳新材料股份有限公司 Pipeline heavy-duty anti-corrosion polyurea protective material and preparation method thereof
CN111500170A (en) * 2020-05-11 2020-08-07 青岛爱尔家佳新材料股份有限公司 Amino functionalized graphene modified polyurea long-acting anticorrosive coating and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110982402A (en) * 2019-12-24 2020-04-10 青岛爱尔家佳新材料股份有限公司 Pipeline heavy-duty anti-corrosion polyurea protective material and preparation method thereof
CN111500170A (en) * 2020-05-11 2020-08-07 青岛爱尔家佳新材料股份有限公司 Amino functionalized graphene modified polyurea long-acting anticorrosive coating and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
刘桂芝: "基于二硫化钼的改性环氧涂层的制备及其耐腐蚀性能研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》 *

Similar Documents

Publication Publication Date Title
CN110564274B (en) Wear-resistant polyurea coating and preparation method and application thereof
CN110564279B (en) Ocean engineering anticorrosive polyurea coating and preparation method thereof
CN111548712B (en) Quickly-cured building polyurea explosion-proof coating and preparation method thereof
CN107532037B (en) System for forming an elastomeric composition for application to a metal
WO2021027370A1 (en) Rigid and high-temperature-resistant polyurea anti-corrosion coating and preparation method therefor
CN115678395B (en) High-toughness high-strength polyurea nano-coating
AU2021402785A1 (en) Polyurethane modified graphene microsheet and preparation method therefor
CN110054980B (en) Single-component moisture-curing polyurethane heavy-duty anticorrosive coating and preparation method thereof
CN110423590B (en) POZD repairing material special for drinking water facilities, preparation method and repairing construction method thereof
CN109627951B (en) Modified epoxy resin, preparation method thereof and high-throwing-power cathode electrophoretic coating
CN109988493A (en) A kind of weatherability repair paint composition and its preparation method and application
CN113004779A (en) Polyurea coating for seepage prevention of storage power station warehouse basin and preparation method thereof
CN110396170A (en) The asparagus fern polyurea resin compound of high-durability, abrasion performance and waterproof corrosion protection
CN112480797A (en) Anticorrosive polyurea coating for petrochemical industry and preparation method thereof
CN113831830B (en) High-barrier polyurethane self-repairing composition and preparation method thereof
CN112280448B (en) Anticorrosive polyurea coating for petrochemical industry and preparation method thereof
CN112592648A (en) Spraying type anti-corrosion polyurea coating for waste incineration industry and preparation method thereof
CN109593460A (en) A kind of fast spraying curing type modified polyurethane acid resisting material and preparation method thereof
CN110922860B (en) Environment-friendly gas-sensitive paint for volatile acid and preparation method thereof
CN114574081A (en) Preparation method of heavy-duty anticorrosive protective coating for metal surface
JPS61197660A (en) Urethane resin coating composition
CN111500156A (en) Oil-separating base coat for long-acting anticorrosion system and preparation method thereof
CN112760020A (en) Antibacterial and anticorrosive polyurea coating and preparation method thereof
CN115322427B (en) Cabin floor covering material and preparation method thereof
CN115975340A (en) High crack following epoxy coating for concrete, coating, preparation method and application thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20210312