CN115109446A - Preparation process method of self-emulsified water-based epoxy coating - Google Patents
Preparation process method of self-emulsified water-based epoxy coating Download PDFInfo
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- CN115109446A CN115109446A CN202210978530.8A CN202210978530A CN115109446A CN 115109446 A CN115109446 A CN 115109446A CN 202210978530 A CN202210978530 A CN 202210978530A CN 115109446 A CN115109446 A CN 115109446A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229920006334 epoxy coating Polymers 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 88
- 239000002071 nanotube Substances 0.000 claims abstract description 68
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 238000004945 emulsification Methods 0.000 claims abstract description 6
- 229920001690 polydopamine Polymers 0.000 claims description 53
- 239000008367 deionised water Substances 0.000 claims description 40
- 229910021641 deionized water Inorganic materials 0.000 claims description 40
- -1 magnesium nitride Chemical class 0.000 claims description 30
- 239000011777 magnesium Substances 0.000 claims description 26
- 229910052749 magnesium Inorganic materials 0.000 claims description 26
- 239000000945 filler Substances 0.000 claims description 17
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 15
- 239000005995 Aluminium silicate Substances 0.000 claims description 13
- 235000012211 aluminium silicate Nutrition 0.000 claims description 13
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 13
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 12
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- 239000003822 epoxy resin Substances 0.000 claims description 11
- 229920000647 polyepoxide Polymers 0.000 claims description 11
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 11
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 6
- 239000002070 nanowire Substances 0.000 claims description 6
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 6
- 235000011152 sodium sulphate Nutrition 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 2
- 229910000077 silane Inorganic materials 0.000 claims description 2
- 238000003756 stirring Methods 0.000 abstract description 2
- 230000006866 deterioration Effects 0.000 abstract 1
- 230000002028 premature Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 8
- 239000000347 magnesium hydroxide Substances 0.000 description 8
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000003973 paint Substances 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- 239000004721 Polyphenylene oxide Substances 0.000 description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 4
- 125000005375 organosiloxane group Chemical group 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 229920000570 polyether Polymers 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 229910001415 sodium ion Inorganic materials 0.000 description 4
- 238000012827 research and development Methods 0.000 description 3
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 2
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000001282 organosilanes Chemical class 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013268 sustained release Methods 0.000 description 1
- 239000012730 sustained-release form Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
Classifications
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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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- 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
-
- 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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- 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)
- Compositions Of Macromolecular Compounds (AREA)
- Paints Or Removers (AREA)
Abstract
The invention provides a preparation process method of a self-emulsified water-based epoxy coating, and relates to the technical field of water-based epoxy coatings. The preparation process method of the self-emulsified water-based epoxy coating comprises the following steps: the preparation method comprises the steps of firstly, preparing the slow-release nanotube, secondly, preparing the composition, thirdly, premixing the composition A and the composition C, fourthly, pretreating the composition B, and fifthly, finally mixing. By preparing the three compositions and storing them separately, premature deterioration of the components can be avoided, and by introducing the pretreated composition B into the premixed compositions A and C, self-emulsification can be achieved without stirring, and the stability can meet the basic use requirements.
Description
Technical Field
The invention relates to the technical field of water-based epoxy coatings, in particular to a preparation process method of a self-emulsified water-based epoxy coating.
Background
The epoxy paint is a paint using water as a solvent or a dispersion medium. The water-based epoxy coating comprises a water-soluble epoxy coating and a water-emulsified coating.
The self-emulsifying water-based epoxy coating on the market is mainly subjected to chemical modification, and although the obtained water-based epoxy coating is good in stability, the research and development difficulty is high, so that the research and development period to the production is prolonged, and the cost performance is low, so that the preparation process method of the self-emulsifying water-based epoxy coating is invented.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation process method of a self-emulsified water-based epoxy coating, and solves the problems of high research and development cost and low profit of a chemically modified self-emulsified water-based epoxy coating.
(II) technical scheme
In order to realize the purpose, the invention is realized by the following technical scheme: a preparation process method of a self-emulsified water-based epoxy coating comprises the following preparation steps:
step one, preparing the slow-release nanotube
Filling nano magnesium nitride into a polydopamine nanotube with openings at two ends, and crushing the polydopamine nanotube by using an ultrasonic nano crusher in a dry environment to obtain a slow-release nanotube;
step two, preparing the composition
Mixing the waterborne epoxy resin, the methyl acrylate and the aluminum tripolyphosphate to obtain a composition A; mixing the slow-release nanotube and polydopamine to obtain a composition B; mixing a silane advection agent and a color filler to obtain a composition C;
step three, premixing the composition A and the composition C
Mixing the composition A and the composition C, and adding four fifths of deionized water in the process;
step four, pretreatment of composition B
Adding the rest deionized water into the composition B, and treating for 20S by using an ultrasonic oscillator;
step five, final mixing
And (3) introducing the composition B obtained in the fourth step from the bottom of the mixed composition A and composition C, and completing self-emulsification within 10 min.
Preferably, the polydopamine nanotube is a product coated by polydopamine and water-soluble sodium sulfate nanowires as templates.
Preferably, the sustained-release nanotube obtained in the step 1 is stored in a dry and closed environment.
Preferably, the color filler is talc and kaolin in a ratio of 1: 2 the resulting mixture.
(III) advantageous effects
The invention provides a preparation process method of a self-emulsified water-based epoxy coating. The method has the following beneficial effects:
in the invention, the three compositions are prepared and stored separately, so that the components can be prevented from being deteriorated in advance, and the pretreated composition B is introduced into the premixed composition A and the premixed composition C, so that the self-emulsification can be completed without stirring, and the stability can meet the basic use requirement.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A self-emulsifying formula for preparing a water-based epoxy coating comprises the following components in parts by weight: 22-35 parts of waterborne epoxy resin, 5-10 parts of polydopamine, 3-5 parts of slow-release nanotubes, 2-4 parts of organosilane leveling agent, 5-10 parts of acrylic copolymer, 1.5 parts of aluminum tripolyphosphate, 8-12 parts of color filler and 80-100 parts of deionized water.
The first embodiment is as follows:
the embodiment of the invention provides a self-emulsifying formula for preparing a water-based epoxy coating, which comprises the following components in parts by weight: 22 parts of waterborne epoxy resin, 5 parts of polydopamine, 3 parts of slow-release nanotubes, 2 parts of polyether polyester modified organosiloxane, 5 parts of methyl acrylate, 1.5 parts of aluminum tripolyphosphate, 8 parts of color filler and 80 parts of deionized water;
the color fillers are talcum powder and kaolin, and the weight ratio of the talcum powder to the kaolin is 1: 2 the resulting mixture.
The slow release nanotube is a product obtained by filling a polydopamine nanotube with openings at two ends with nano magnesium nitride under the action of capillary tubes, the polydopamine nanotube is a product coated by polydopamine on water-soluble sodium sulfate nanowires as a template, the polydopamine nanotube is filled with the nano magnesium nitride and then crushed by an ultrasonic nano crusher in a dry environment to obtain the slow release nanotube, and the slow release nanotube is stored in a dry container.
The preparation method of the self-emulsifying water-based epoxy coating comprises the following steps: mixing waterborne epoxy resin, methyl acrylate and aluminum tripolyphosphate to obtain a composition A, mixing a slow-release nanotube with polydopamine to obtain a composition B, mixing polyether polyester modified organosiloxane and a color filler to obtain a composition C, mixing the composition A and the composition C, adding four fifths of deionized water in the process, cooling the rest of deionized water to-20 ℃, adding the deionized water into the composition B, treating the mixture for 20 seconds by using an ultrasonic oscillator, introducing the deionized water from the bottom of the mixture of the composition A and the composition C, releasing nano magnesium nitride in the slow-release nanotube during the treatment of the deionized water and the composition B in the ultrasonic oscillator, generating an alkaline environment after the nano magnesium nitride is contacted with the deionized water, ensuring the polymerization stability of the polydopamine in the alkaline environment, and combining the polydopamine with the mixed composition A and the composition C, due to the reaction of the deionized water and the nano magnesium nitride, the generated ammonia gas is released from the end part of the polydopamine nanotube, so that the slow release nanotube is slowly pushed in the self-emulsifying aqueous epoxy coating, the magnesium hydroxide precipitate obtained by the reaction is attached to the inner wall of the polydopamine nanotube, the contact between the deionized water and the nano magnesium nitride component is slowed down, the release of the ammonia gas is slowed down, the viscosity of the self-emulsifying aqueous epoxy coating is increased, the resistance when the components are separated is increased, meanwhile, the polydopamine nanotube is gradually contacted with the deionized water component, and the generated sodium ions and the tripolyphosphate radical environment enable the magnesium hydroxide, the aluminum hydroxide, the talcum powder and the kaolin component to be well suspended in the self-emulsifying aqueous epoxy coating.
Example two:
the embodiment of the invention provides a self-emulsifying formula for preparing a water-based epoxy coating, which comprises the following components in parts by weight: 25 parts of waterborne epoxy resin, 8 parts of polydopamine, 4 parts of slow-release nanotubes, 3 parts of polyether polyester modified organosiloxane, 8 parts of 2-methyl methacrylate, 1.5 parts of aluminum tripolyphosphate, 10 parts of color filler and 90 parts of deionized water;
the color fillers are talcum powder and kaolin, and the weight ratio of the talcum powder to the kaolin is 1: 2 the resulting mixture.
The slow-release nanotube is a product obtained by filling a polydopamine nanotube with openings at two ends with nano magnesium nitride under the action of a capillary tube, the polydopamine nanotube is a product coated by polydopamine on a water-soluble sodium sulfate nanowire as a template, the polydopamine nanotube is filled with the nano magnesium nitride and then crushed by an ultrasonic nano crusher in a dry environment to obtain the slow-release nanotube, and the slow-release nanotube is stored in a dry container.
The preparation method of the self-emulsifying water-based epoxy coating comprises the following steps: mixing water-based epoxy resin, 2-methyl methacrylate and aluminum tripolyphosphate to obtain a composition A, mixing a slow-release nanotube with polydopamine to obtain a composition B, mixing polyether polyester modified organosiloxane with a color filler to obtain a composition C, mixing the composition A with the composition C, adding four fifths of deionized water during the mixing process, cooling the rest deionized water to-20 ℃, adding the deionized water into the composition B, treating the mixture for 20 seconds by using an ultrasonic oscillator, introducing the mixture from the bottom of the mixture of the composition A and the composition C, releasing nano magnesium nitride in the slow-release nanotube during the treatment of the deionized water and the composition B in the ultrasonic oscillator, generating an alkaline environment after the nano magnesium nitride is contacted with the deionized water, ensuring the polymerization stability of the polydopamine in the alkaline environment, and combining the polydopamine with the mixed composition A and the composition C, due to the reaction of the deionized water and the nano magnesium nitride, the generated ammonia gas is released from the end part of the polydopamine nanotube, so that the slow release nanotube is slowly pushed in the self-emulsifying aqueous epoxy coating, the magnesium hydroxide precipitate obtained by the reaction is attached to the inner wall of the polydopamine nanotube, the contact between the deionized water and the nano magnesium nitride component is slowed down, the release of the ammonia gas is slowed down, the viscosity of the self-emulsifying aqueous epoxy coating is increased, the resistance when the components are separated is increased, meanwhile, the polydopamine nanotube is gradually contacted with the deionized water component, and the generated sodium ions and the tripolyphosphate radical environment enable the magnesium hydroxide, the aluminum hydroxide, the talcum powder and the kaolin component to be well suspended in the self-emulsifying aqueous epoxy coating.
Example three:
the embodiment of the invention provides a self-emulsifying formula for preparing a water-based epoxy coating, which comprises the following components in parts by weight: 35 parts of waterborne epoxy resin, 10 parts of polydopamine, 5 parts of slow-release nanotubes, 4 parts of alkyl modified organosiloxane, 10 parts of ethyl acrylate, 1.5 parts of aluminum tripolyphosphate, 12 parts of color filler and 100 parts of deionized water;
the color fillers are talcum powder and kaolin which are mixed in a ratio of 1: 2 the resulting mixture.
The slow-release nanotube is a product obtained by filling a polydopamine nanotube with openings at two ends with nano magnesium nitride under the action of a capillary tube, the polydopamine nanotube is a product coated by polydopamine on a water-soluble sodium sulfate nanowire as a template, the polydopamine nanotube is filled with the nano magnesium nitride and then crushed by an ultrasonic nano crusher in a dry environment to obtain the slow-release nanotube, and the slow-release nanotube is stored in a dry container.
The preparation method of the self-emulsifying water-based epoxy coating comprises the following steps: mixing water-based epoxy resin, methyl acrylate, aluminum tripolyphosphate, alkyl modified organosiloxane and a color filler to obtain a composition A, mixing a slow-release nanotube and polydopamine to obtain a composition B, adding 100 parts of deionized water into the composition A, adding the composition B into a container, quickly pouring the composition A with the deionized water onto the composition B, treating the composition A and the composition B by using an ultrasonic oscillator, releasing the nano magnesium nitride in the slow-release nanotube during the treatment of the deionized water and the composition B by using the ultrasonic oscillator, generating an alkaline environment after the nano magnesium nitride is contacted with the deionized water, ensuring the polymerization stability of the polydopamine in the alkaline environment, and releasing generated ammonia gas from the end of the polydopamine nanotube through the reaction of the deionized water and the nano magnesium nitride, the slow-release nanotube is slowly pushed in the self-emulsifying water-based epoxy coating, the magnesium hydroxide precipitate obtained by reaction is attached to the inner wall of the polydopamine nanotube, the contact between deionized water and the nano magnesium nitride component is slowed down, the release of ammonia gas is slowed down, however, the viscosity of the self-emulsifying water-based epoxy coating is increased, the resistance when the components are separated is increased, meanwhile, the polydopamine nanotube is gradually contacted with the deionized water component, and the generated sodium ions and the tripolyphosphate radical environment are utilized, so that the magnesium hydroxide, the aluminum hydroxide, the talcum powder and the kaolin component can be well suspended in the self-emulsifying water-based epoxy coating.
Example four:
the embodiment of the invention provides a self-emulsifying formula for preparing a water-based epoxy coating, which comprises the following components in parts by weight: 32 parts of waterborne epoxy resin, 9 parts of polydopamine, 4 parts of slow-release nanotubes, 4 parts of alkyl modified organosiloxane, 9 parts of ethyl acrylate, 1.5 parts of aluminum tripolyphosphate, 11 parts of color filler and 95 parts of deionized water;
the color fillers are talcum powder and kaolin, and the weight ratio of the talcum powder to the kaolin is 1: 2 the resulting mixture.
The slow-release nanotube is a product obtained by filling a polydopamine nanotube with openings at two ends with nano magnesium nitride under the action of a capillary tube, the polydopamine nanotube is a product coated by polydopamine on a water-soluble sodium sulfate nanowire as a template, the polydopamine nanotube is filled with the nano magnesium nitride and then crushed by an ultrasonic nano crusher in a dry environment to obtain the slow-release nanotube, and the slow-release nanotube is stored in a dry container.
The preparation method of the self-emulsifying water-based epoxy coating comprises the following steps: taking water-based epoxy resin, methyl acrylate, aluminum tripolyphosphate, alkyl modified organosiloxane and a color filler to mix to obtain a composition A, taking a slow-release nanotube and polydopamine to mix to obtain a composition B, adding 100 parts of deionized water into the composition A, then adding the composition B into a container, then quickly pouring the composition A added with the deionized water onto the composition B, and treating the composition A and the composition B by using an ultrasonic oscillator, wherein the deionized water and the nano magnesium nitride in the slow-release nanotube of the composition B during the treatment of the ultrasonic oscillator are released in the process, an alkaline environment is generated after the nano magnesium nitride is contacted with the deionized water, the polydopamine ensures the stability of polymerization in the alkaline environment, and the deionized water reacts with the nano magnesium nitride to generate ammonia gas which is released from the end of the polydopamine nanotube, the slow-release nanotube is slowly pushed in the self-emulsifying water-based epoxy coating, the magnesium hydroxide precipitate obtained by reaction is attached to the inner wall of the polydopamine nanotube, the contact between deionized water and the nano magnesium nitride component is slowed down, the release of ammonia gas is slowed down, however, the viscosity of the self-emulsifying water-based epoxy coating is increased, the resistance when the components are separated is increased, meanwhile, the polydopamine nanotube is gradually contacted with the deionized water component, and the generated sodium ions and the tripolyphosphate radical environment are utilized, so that the magnesium hydroxide, the aluminum hydroxide, the talcum powder and the kaolin component can be well suspended in the self-emulsifying water-based epoxy coating.
The time for completing emulsification of the self-emulsifying water-based epoxy paint obtained in the first embodiment and the second embodiment is 4-5min and 2.5-3min respectively, the time for completing emulsification of the self-emulsifying water-based epoxy paint obtained in the third embodiment and the fourth embodiment is 6-6.5min and 5.5-6min respectively, and the preparation method of the self-emulsifying water-based epoxy paint corresponding to the first embodiment and the second embodiment is superior to that of the first embodiment and the second embodiment.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A preparation process method of a self-emulsified water-based epoxy coating is characterized by comprising the following steps of; the preparation method comprises the following preparation steps:
step one, preparing the slow-release nanotube
Filling nano magnesium nitride into a polydopamine nanotube with openings at two ends, and crushing the polydopamine nanotube by using an ultrasonic nano crusher in a dry environment to obtain a slow-release nanotube;
step two, preparing the composition
Mixing waterborne epoxy resin, methyl acrylate and aluminum tripolyphosphate to obtain a composition A; mixing the slow-release nanotube and polydopamine to obtain a composition B; mixing silane leveling agent and color filler to obtain a composition C;
step three, premixing the composition A and the composition C
Mixing the composition A and the composition C, and adding four fifths of deionized water in the process;
step four, pretreatment of composition B
Adding the rest of deionized water into the composition B, and treating for 20S by using an ultrasonic oscillator;
step five, final mixing
And (3) introducing the composition B obtained in the fourth step from the bottom of the mixed composition A and composition C, and completing self-emulsification within 10 min.
2. The process for preparing a self-emulsifying aqueous epoxy coating according to claim 1, wherein: the polydopamine nanotube is a product coated by polydopamine and water-soluble sodium sulfate nanowires as templates.
3. The process for preparing a self-emulsifying aqueous epoxy coating according to claim 1, wherein: and (2) storing the slow-release nanotube obtained in the step (1) in a dry and closed environment.
4. The process for preparing a self-emulsifying aqueous epoxy coating according to claim 1, wherein: the color filler is prepared from talcum powder and kaolin in a weight ratio of 1: 2 the resulting mixture.
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2022
- 2022-08-16 CN CN202210978530.8A patent/CN115109446A/en active Pending
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Application publication date: 20220927 |