CN112592648A - Spraying type anti-corrosion polyurea coating for waste incineration industry and preparation method thereof - Google Patents

Spraying type anti-corrosion polyurea coating for waste incineration industry and preparation method thereof Download PDF

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CN112592648A
CN112592648A CN202011390546.4A CN202011390546A CN112592648A CN 112592648 A CN112592648 A CN 112592648A CN 202011390546 A CN202011390546 A CN 202011390546A CN 112592648 A CN112592648 A CN 112592648A
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component
preparation
waste incineration
polyurea coating
layered material
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王宝柱
苏坤
高霖
张天华
宋丹
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Qingdao Air++ New Materials Co ltd
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Qingdao Air++ New Materials Co ltd
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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
    • 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
    • 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

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention provides a preparation method of a spray-type anticorrosive polyurea coating for the waste incineration industry, which belongs to the technical field of high polymer materials, wherein a two-dimensional layered material is added into a chitosan solution to prepare a dispersion solution, then 4, 4' - (cyclohexane-2, 5-diene-1, 4-dimethylene bis (azaalkylidene)) diphenylamine, 1, 4-phthalic anhydride and DMF are mixed and then added into the dispersion solution to prepare a modified two-dimensional layered material, and then polyhydric alcohol and polyisocyanate are sequentially added to react to obtain a component A; mixing amino-terminated polyether, polyol, a coupling agent, a chain extender, a catalyst, a water removing agent and color paste, stirring, grinding and filtering to obtain a component B; when in use, the volume ratio of the component A to the component B is 1: 1. The invention also provides the spray type anticorrosive polyurea coating prepared by the preparation method. The invention adopts the two-dimensional layered material and modifies the two-dimensional layered material through the carboxylated polyaniline, thereby improving the adhesive force and the corrosion resistance while maintaining the excellent physical properties of the polyurea.

Description

Spraying type anti-corrosion polyurea coating for waste incineration industry and preparation method thereof
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a spraying type anticorrosive polyurea coating for the waste incineration industry and a preparation method thereof.
Background
Along with the further and deeper urbanization process, the quantity of municipal solid waste is greatly increased, and the construction speed of waste incineration power plants is accelerated in various places. The waste incineration power generation realizes the harmlessness, reduction and recycling of solid waste treatment, but various risks such as smoke pollution, sewage pollution and other environmental protection risks still exist. Especially, the corrosion resistance and the leakage resistance of environment-friendly facilities such as a household garbage storage pit, a percolate water pool and the like are very important.
Traditional lagoon corrosion protection has a well established art, with the earliest uses of corrosion resistant coatings such as: epoxy coal tar pitch, cyanamide, epoxy, polyurethane and the like, although the corrosion is effectively controlled, the coating film layer is not easy to be thickly coated and has short service life, so that the epoxy coal tar pitch, the cyanamide, the epoxy, the polyurethane and the like are eliminated. The second generation sewage pool anticorrosion process adopts fiber reinforced plastics, namely resin glass Fiber Reinforced Plastics (FRP) generally forms an ultra-thick anticorrosion lamination with strength through compounding resin and fiber, so that the service life is greatly prolonged, and the service life of 5 mm glass fiber reinforced plastics reaches 8 years or more according to actual application effects, such as epoxy coal tar pitch glass fiber reinforced plastics, vinyl glass fiber reinforced plastics, epoxy phenolic aldehyde glass fiber reinforced plastics, epoxy furan glass fiber reinforced plastics and the like. However, with the continuous development of the anti-corrosion material and the process, the material and the process have more and more outstanding defects, such as the service life which cannot meet the requirements of a user, long construction period, delamination and cracking of an anti-corrosion layer, untight package of a special-shaped curved surface, limited stress release, high manufacturing cost, unsafe construction, harm to the health of construction personnel and the like.
Therefore, in order to solve the problem of corrosion prevention of the garbage pool and the percolate pool in the garbage incineration industry, a sewage corrosion prevention process which is simple in construction, short in construction period and good in corrosion prevention performance and physicochemical performance needs to be researched to replace a second-generation sewage pool corrosion prevention process.
Disclosure of Invention
In view of the above, the invention provides a spray type anticorrosive polyurea coating for the waste incineration industry and a preparation method thereof, wherein the raw materials adopt a two-dimensional layered material, the development area of the two-dimensional layered material is large, the two-dimensional layered material is modified by carboxylated polyaniline, the two-dimensional layered material can be uniformly distributed on a polyurea body, the performance of the two-dimensional layered material is fully exerted, and the adhesive force and the anticorrosive performance of polyurea are improved while the excellent physical performance of the polyurea is maintained; in addition, although the two-dimensional layered material is a powder substance, the addition amount is small, and the physical properties and the spraying efficiency of the polyurea are not influenced.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of a spray type anticorrosive polyurea coating for the waste incineration industry comprises the following steps:
preparation of component A:
according to the weight portion of the components,
adding 2-4 parts of two-dimensional layered material into 50 parts of chitosan solution, and ultrasonically dispersing for 1-2 hours to prepare two-dimensional layered material dispersion liquid for later use;
stirring 1-2 parts of 4, 4' - (cyclohexane-2, 5-diene-1, 4-dimethylenebis (azaalkylene)) diphenylamine, 1-2 parts of 1, 4-phthalic anhydride and 20-40 parts of DMF (dimethyl formamide) solvent at 60 ℃ for 2 hours in an inert environment; then, adding the two-dimensional layered material dispersion liquid, and continuously reacting for 2 hours at the temperature of 60 ℃; then, NaOH solution with the concentration of 1mol/L is used for adjusting the pH value to be neutral; washing the product with deionized water, and vacuum drying at 60 deg.C for 12h to obtain modified two-dimensional layered material, and sealing in inert environment;
in a vacuum environment, stirring and heating 50-150 parts of polyol to 95-105 ℃, adding the modified two-dimensional layered material, dehydrating for 5-7 h, relieving the vacuum, cooling to below 50 ℃, adding 150-250 parts of polyisocyanate, reacting for 3-4h at 90 ℃, measuring the-NCO value, and discharging to obtain a component A;
preparation of the component B:
according to the mass ratio (30-60): (20-50): (1-2): (20-40): (0-1): (1-5): (1-5) sequentially adding the amino-terminated polyether, the polyol, the coupling agent, the chain extender, the catalyst, the water removing agent and the color paste into a storage tank of a dispersion machine, stirring at room temperature for 15-30 min, grinding by a sand mill and filtering to obtain a component B;
when the paint is used, the volume ratio of the component A to the component B is 1:1, and spraying construction is carried out by using spraying equipment.
Furthermore, the-NCO value of the component A is 14% -17%, and the isocyanate index of the component A and the isocyanate index of the component B are 1.05-1.10.
Further, the two-dimensional layered material is molybdenum disulfide or tungsten disulfide.
Further, the polyisocyanate is one or a mixture of more of diphenylmethane diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, methylcyclohexyl diisocyanate and cyclohexanedimethylene isocyanate, xylylene diisocyanate and 1, 4-cyclohexanediisocyanate.
Furthermore, the purity of 4, 4' - (cyclohexane-2, 5-diene-1, 4-dimethylenebis (azaalkylidene)) diphenylamine is not less than 98%, and the purity of 1, 4-phthalic anhydride is not less than 98%.
Further, the polyhydric alcohol in the component A and the component B is one or a mixture of more of low-unsaturation degree polypropylene oxide 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.
Further, the amino-terminated polyether in the component B comprises difunctional amino-terminated polyether and/or trifunctional amino-terminated polyether.
Further, the chain extender in the component B comprises one or a mixture of more of 3, 5-dimethylthio toluenediamine, 2, 4-diamino-3, 5-dimethylthio chlorobenzene, 4 ' -bis-sec-butylaminodiphenylmethane, N ' -dialkyl phenylenediamine, 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.
Further, the coupling agent in the component B is a compound of 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;
the catalyst is one or a mixture of more of bismuth isooctanoate, zinc isooctanoate, triethylene diamine, dimorpholinyl diethyl ether, tetrabutyl titanate and tetraisopropyl titanate;
the water removing agent is a molecular sieve with the specification of 3a or 4 a;
the color paste is universal in polyurethane industry, the color of the color paste is any one of red, yellow, blue, green, white and black, and the water content of the color paste is less than or equal to 0.5 percent.
The invention also provides a spraying type anticorrosive polyurea coating prepared by the preparation method and used for the waste incineration industry.
The spray type anticorrosive polyurea coating for the waste incineration industry has the following beneficial effects:
(1) the material has excellent mechanical property, the drawing strength can reach 12MPa, the tensile strength can reach 18MPa, the elongation at break can reach 400%, and the tearing strength can reach 80N/mm.
(2) The material can be used for large-area spraying construction by adopting special equipment, and the construction efficiency is high.
(3) The material has excellent anti-corrosion performance, and alternating current impedance Z agent0.01Hz≥1×1010Ωcm2。
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.
The invention provides a preparation method of a spray type anticorrosive polyurea coating for the waste incineration industry, which comprises the following steps:
preparation of component A:
according to the weight portion of the components,
adding 2-4 parts of two-dimensional layered material into 50 parts of chitosan solution, and ultrasonically dispersing for 1-2 hours to prepare two-dimensional layered material dispersion liquid for later use;
stirring 1-2 parts of 4, 4' - (cyclohexane-2, 5-diene-1, 4-dimethylenebis (azaalkylene)) diphenylamine, 1-2 parts of 1, 4-phthalic anhydride and 20-40 parts of DMF (dimethyl formamide) solvent at 60 ℃ for 2 hours in an inert environment; then, adding the two-dimensional layered material dispersion liquid, and continuously reacting for 2 hours at the temperature of 60 ℃; then, NaOH solution with the concentration of 1mol/L is used for adjusting the pH value to be neutral; washing the product with deionized water, and vacuum drying at 60 deg.C for 12h to obtain modified two-dimensional layered material, and sealing in inert environment;
in a vacuum environment, stirring and heating 50-150 parts of polyol to 95-105 ℃, adding the modified two-dimensional layered material, dehydrating for 5-7 h, relieving the vacuum, cooling to below 50 ℃, adding 150-250 parts of polyisocyanate, reacting for 3-4h at 90 ℃, measuring the-NCO value, and discharging to obtain a component A;
preparation of the component B:
according to the mass ratio (30-60): (20-50): (1-2): (20-40): (0-1): (1-5): (1-5) sequentially adding the amino-terminated polyether, the polyol, the coupling agent, the chain extender, the catalyst, the water removing agent and the color paste into a storage tank of a dispersion machine, stirring at room temperature for 15-30 min, grinding by a sand mill and filtering to obtain a component B;
when the paint is used, the volume ratio of the component A to the component B is 1:1, and spraying construction is carried out by using spraying equipment.
According to the invention, the two-dimensional layered material is dispersed into the nano composite film in the chitosan solution, each unit of the chitosan has the hydrophilic biopolymer with amino and hydroxyl, and the chitosan can be protonated into the polycationic material in an acidic medium, so that the interaction between a polymer chain and the two-dimensional layered material is facilitated, and the dispersibility of the two-dimensional layered material in the polymer is obviously improved. And secondly, the two-dimensional nano material (such as molybdenum disulfide and tungsten disulfide) has a lamellar structure, and the lamellar structure can cover the surface of the coating to form a micro-nano layer, so that the corrosion resistance and the hydrophobicity of the coating can be improved. In addition, the chemical structure of the chitosan contains amino, and the chitosan can react with isocyanate to increase the crosslinking density of polyurea.
The invention adopts 4, 4' - (cyclohexane-2, 5-diene-1, 4-dimethylene bis (azaalkylidene)) diphenylamine as a raw material, which is a polyaniline compound, and because the reduction potential of polyaniline is 0V/SCE, and the oxidation potential of metal such as Fe is-0.7V/SCE, the polyaniline is used as an intermediate substance to form a layer of compact oxidation film at a metal interface with the metal through oxygen, so that the metal is passivated, and the aim of corrosion prevention is achieved.
In the component A raw material of the polyurea coating, 4,4 '- (cyclohexyl-2, 5-diene-1, 4-dimethylene bis (azaalkylidene)) diphenylamine, 1, 4-phthalic anhydride, chitosan, 4, 4' - (cyclohexyl-2, 5-diene-1, 4-dimethylene bis (azaalkylidene)) diphenylamine and 1, 4-phthalic anhydride are subjected to carboxylation reaction, terminal carboxyl and amino in chitosan can be subjected to polycondensation reaction, and the terminal carboxylation greatly improves the solubility of the terminal carboxyl in polyhydric alcohol, so that the dispersion uniformity of a two-dimensional layered material in a system is improved.
Wherein, the two-dimensional layered material can be selected from molybdenum disulfide or tungsten disulfide, and preferably, the purity of 4, 4' - (cyclohexane-2, 5-diene-1, 4-dimethylene bis (azaalkylidene)) diphenylamine is more than or equal to 98 percent, and the purity of 1, 4-phthalic anhydride is more than or equal to 98 percent. In the preparation, the-NCO value of the component A can be controlled to be 14-17%, and the isocyanate index of the component A and the isocyanate index of the component B are 1.05-1.10.
Wherein the polyisocyanate is one or a mixture of more of diphenylmethane diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, methylcyclohexyl diisocyanate and cyclohexane dimethylene diisocyanate, xylylene diisocyanate and 1, 4-cyclohexane diisocyanate.
The polyhydric alcohol in the component A and the component B is one or a mixture of more of low-unsaturation degree polypropylene oxide 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.
The amino-terminated polyether in the component B comprises difunctional amino-terminated polyether and/or trifunctional amino-terminated polyether. The chain extender comprises one or a mixture of more of 3, 5-dimethylthiotoluenediamine (E-300), 2, 4-diamino-3, 5-dimethylthiochlorobenzene (TX-2), 4 ' -bis-sec-butylaminodiphenylmethane (Unilink4200), N ' -dialkylphenylenediamine, 2, 4-diamino-3-methylthio-5-propyltoluene (TX-3), 3 ' -dimethyl-4, 4 ' -diaminodicyclohexylmethane, 4 ' -bis-sec-butylaminodicyclohexylmethane, 3 ' -dimethyl-4, 4 ' -bis-sec-butylaminodicyclohexylmethane, trimethylhexamethylenediamine, hydrogenated MDA and the like. The coupling agent is one or a compound of 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. The catalyst is one or a mixture of more of bismuth isooctanoate, zinc isooctanoate, triethylene diamine, dimorpholinyl diethyl ether, tetrabutyl titanate and tetraisopropyl titanate. The water removing agent is a molecular sieve with the specification of 3a or 4 a. The color paste is universal in polyurethane industry, the color of the color paste is any one of red, yellow, blue, green, white, black and the like, and the water content of the color paste is less than or equal to 0.5 percent.
The invention also provides a spraying type anticorrosive polyurea coating prepared by the preparation method and used for the waste incineration industry.
Example 1
A spray type anticorrosive polyurea coating for the waste incineration industry is prepared by the following steps:
(1) preparation of component A
According to the weight portion of the components,
and adding 2 parts of molybdenum disulfide into 50 parts of chitosan solution, and performing ultrasonic dispersion for 1 hour to prepare molybdenum disulfide dispersion for later use.
1 part of 4, 4' - (cyclohexane-2, 5-diene-1, 4-dimethylenebis (azaalkylene)) diphenylamine, 1 part of 1, 4-phthalic anhydride and 40 parts of solvent DMF are stirred at 60 ℃ for 2h in an inert atmosphere. And then adding the molybdenum disulfide dispersion liquid, continuing to react for 2 hours at 60 ℃, adjusting the pH to be neutral by using a NaOH solution with the concentration of 1mol/L after the reaction is finished, washing the product by using deionized water, and drying for 12 hours in vacuum at 60 ℃ to obtain the molybdenum disulfide dispersion liquid, wherein the molybdenum disulfide dispersion liquid is sealed and stored in an inert environment for later use.
In an inert environment, 100 parts of PTMEG1000 and modified molybdenum disulfide are stirred and heated to 95 ℃, dehydrated for 5 hours under the vacuum of-0.1 MPa, the vacuum is released, the temperature is reduced to below 50 ℃, 200 parts of MDI-50 are added, the reaction is carried out for 4 hours at the temperature of 90 ℃, after the reaction is finished, the-NCO value is measured to be 14%, and then the materials are discharged and packaged.
(2) Preparation of component B
According to the weight parts, 30 parts of amino-terminated polyether D2000, 20 parts of PTMEG1000,2 parts of silane coupling agent A171, 35 parts of chain extender E100, 0.1 part of catalyst bismuth isooctanoate, 5 parts of 3A molecular sieve and 1 part of color paste are sequentially put into a storage tank of a high-speed dispersion machine, stirred at room temperature for 15-30 min, ground by a sand mill until the fineness is qualified, and filtered and packaged by a 200-mesh copper filter screen to obtain the component B.
(3) And spraying the prepared component A and the component B on the surface of the steel plate by using spraying equipment according to the volume ratio of 1: 1.
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 as follows: the drawing strength is more than or equal to 12mpa, and the alternating current impedance Z is0.01Hz≥1×1010Ωcm2Tensile strength of 18MPa, elongation at break of 350 percent and tear strength of 80N/mm.
Example 2
A spray type anticorrosive polyurea coating for the waste incineration industry is prepared by the following steps:
(1) preparation of component A
According to the weight portion of the components,
and adding 1 part of molybdenum disulfide into 50 parts of chitosan solution, and performing ultrasonic dispersion for 1 hour to prepare molybdenum disulfide dispersion for later use.
2 parts of 4, 4' - (cyclohexane-2, 5-diene-1, 4-dimethylenebis (azaalkylidene)) diphenylamine, 2 parts of 1, 4-phthalic anhydride and 40 parts of DMF solvent are stirred at 60 ℃ for 2h in an inert atmosphere. And then adding the molybdenum disulfide dispersion liquid, continuing to react for 2 hours at 60 ℃, after the reaction is finished, adjusting the pH to be neutral by using a NaOH solution with the concentration of 1mol/L, washing the product by using deionized water, and drying in vacuum for 12 hours at 60 ℃ to obtain the molybdenum disulfide dispersion liquid, wherein the molybdenum disulfide dispersion liquid is sealed and stored in an inert environment for later use.
In an inert environment, 150 parts of PTMEG1000 and modified molybdenum disulfide are stirred and heated to 95 ℃, dehydrated for 5 hours under the vacuum of-0.1 MPa, the vacuum is released, the temperature is reduced to below 50 ℃, 200 parts of MDI-50 are added, the reaction is carried out for 4 hours at the temperature of 90 ℃, after the reaction is finished, the-NCO value is measured to be 14%, and then the materials are discharged and packaged.
(2) Preparation of component B
According to the weight parts, 50 parts of amino-terminated polyether D2000, 20 parts of PTMEG650, 1 part of titanate coupling agent KR-TTS, 20 parts of chain extender Unilink4200, 1 part of 4A molecular sieve and 4 parts of color paste are sequentially put into a storage tank of a high-speed dispersion machine, stirred at room temperature for 15-30 min, ground by a sand mill until the fineness is qualified, filtered and packaged by a 200-mesh copper filter screen, and the component B is prepared.
(3) And spraying the prepared component A and the component B on the surface of the steel plate by using spraying equipment according to the volume ratio of 1: 1.
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 as follows: the drawing strength is more than or equal to 11.5mpa, and the alternating current impedance Z is0.01Hz≥1×1010Ωcm2Tensile strength of 17MPa, elongation at break of 400 percent and tear strength of 80N/mm.
The spray type anticorrosive polyurea coating for the waste incineration industry has the following beneficial effects:
(1) the material has excellent mechanical property, the drawing strength can reach 12MPa, the tensile strength can reach 18MPa, the elongation at break can reach 400%, and the tearing strength can reach 80N/mm.
(2) The material can be used for large-area spraying construction by adopting special equipment, and the construction efficiency is high.
(3) The material has excellent anti-corrosion performance, and alternating current impedance Z agent0.01Hz≥1×1010Ωcm2。
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. A preparation method of a spray type anticorrosive polyurea coating for the waste incineration industry is characterized by comprising the following steps:
preparation of component A:
according to the weight portion of the components,
adding 2-4 parts of two-dimensional layered material into 50 parts of chitosan solution, and ultrasonically dispersing for 1-2 hours to prepare two-dimensional layered material dispersion liquid for later use;
stirring 1-2 parts of 4, 4' - (cyclohexane-2, 5-diene-1, 4-dimethylenebis (azaalkylene)) diphenylamine, 1-2 parts of 1, 4-phthalic anhydride and 20-40 parts of DMF (dimethyl formamide) solvent at 60 ℃ for 2 hours in an inert environment; then, adding the two-dimensional layered material dispersion liquid, and continuously reacting for 2 hours at the temperature of 60 ℃; then, NaOH solution with the concentration of 1mol/L is used for adjusting the pH value to be neutral; washing the product with deionized water, and vacuum drying at 60 deg.C for 12h to obtain modified two-dimensional layered material, and sealing in inert environment;
in a vacuum environment, stirring and heating 50-150 parts of polyol to 95-105 ℃, adding the modified two-dimensional layered material, dehydrating for 5-7 h, relieving the vacuum, cooling to below 50 ℃, adding 150-250 parts of polyisocyanate, reacting for 3-4h at 90 ℃, measuring the-NCO value, and discharging to obtain a component A;
preparation of the component B:
according to the mass ratio (30-60): (20-50): (1-2): (20-40): (0-1): (1-5): (1-5) sequentially adding the amino-terminated polyether, the polyol, the coupling agent, the chain extender, the catalyst, the water removing agent and the color paste into a storage tank of a dispersion machine, stirring at room temperature for 15-30 min, grinding by a sand mill and filtering to obtain a component B;
when the paint is used, the volume ratio of the component A to the component B is 1:1, and spraying construction is carried out by using spraying equipment.
2. The preparation method of the spray type anticorrosive polyurea coating for the waste incineration industry according to claim 1, wherein the-NCO value of the component A is 14-17%, and the isocyanate index of the component A and the isocyanate index of the component B are 1.05-1.10.
3. The preparation method of the spray type anticorrosive polyurea coating for the waste incineration industry according to claim 1, wherein the two-dimensional layered material is molybdenum disulfide or tungsten disulfide.
4. The method for preparing a spray type anticorrosive polyurea coating for the waste incineration industry according to claim 1, wherein the polyisocyanate is one or a mixture of several of diphenylmethane diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, methylcyclohexyl diisocyanate, cyclohexanedimethylene diisocyanate, xylylene diisocyanate, and 1, 4-cyclohexanediisocyanate.
5. The preparation method of the spray type anticorrosive polyurea coating for the waste incineration industry according to claim 1, wherein the purity of 4, 4' - (cyclohexane-2, 5-diene-1, 4-dimethylenebis (azaalkylidene)) diphenylamine is not less than 98%, and the purity of 1, 4-phthalic anhydride is not less than 98%.
6. The preparation method of the spray type anti-corrosion polyurea coating used in the waste incineration industry as claimed in claim 1, wherein the polyol in the component A and the component B is one or a mixture of more of polyoxypropylene glycol with low unsaturation degree, polytetrahydrofuran ether glycol, polycaprolactone glycol, polyester glycol and polycarbonate glycol, the average molecular weight of the polyol 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.
7. The preparation method of the spray type anticorrosive polyurea coating for the waste incineration industry according to claim 1, wherein the amino-terminated polyether in the B component comprises difunctional amino-terminated polyether and/or trifunctional amino-terminated polyether.
8. The preparation method of the spray type corrosion-resistant polyurea coating used in the waste incineration industry according to claim 1, the chain extender in the component B is characterized by comprising one or a mixture of more of 3, 5-dimethylthio toluenediamine, 2, 4-diamino-3, 5-dimethylthio chlorobenzene, 4 ' -bis-sec-butylaminodiphenylmethane, N ' -dialkyl phenylenediamine, 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.
9. The preparation method of the spray type anticorrosive polyurea coating for the waste incineration industry according to claim 1, wherein the coupling agent in the component B is one or a compound of 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;
the catalyst is one or a mixture of more of bismuth isooctanoate, zinc isooctanoate, triethylene diamine, dimorpholinyl diethyl ether, tetrabutyl titanate and tetraisopropyl titanate;
the water removing agent is a molecular sieve with the specification of 3a or 4 a;
the color paste is universal in polyurethane industry, the color of the color paste is any one of red, yellow, blue, green, white and black, and the water content of the color paste is less than or equal to 0.5 percent.
10. A spray type anticorrosive polyurea coating for use in the waste incineration industry, prepared by the preparation method according to any one of claims 1 to 9.
CN202011390546.4A 2020-12-02 2020-12-02 Spraying type anti-corrosion polyurea coating for waste incineration industry and preparation method thereof Pending CN112592648A (en)

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