CN113736344A - Water-based epoxy anticorrosive paint and preparation method thereof - Google Patents
Water-based epoxy anticorrosive paint and preparation method thereof Download PDFInfo
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- CN113736344A CN113736344A CN202111128702.4A CN202111128702A CN113736344A CN 113736344 A CN113736344 A CN 113736344A CN 202111128702 A CN202111128702 A CN 202111128702A CN 113736344 A CN113736344 A CN 113736344A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000003973 paint Substances 0.000 title claims abstract description 17
- 239000004593 Epoxy Substances 0.000 title claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 69
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 29
- 238000000576 coating method Methods 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 239000003822 epoxy resin Substances 0.000 claims description 24
- 229920000647 polyepoxide Polymers 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 22
- 239000011734 sodium Substances 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 229910052708 sodium Inorganic materials 0.000 claims description 18
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 16
- 239000008367 deionised water Substances 0.000 claims description 16
- 229910021641 deionized water Inorganic materials 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 16
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 15
- 239000006185 dispersion Substances 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 13
- 230000007935 neutral effect Effects 0.000 claims description 13
- 239000013067 intermediate product Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 10
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 9
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 9
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 9
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 9
- 239000012279 sodium borohydride Substances 0.000 claims description 9
- 239000002518 antifoaming agent Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- VCZJXEMVLNYRAS-UHFFFAOYSA-M sodium 1,4-diaminobutane-1-sulfonate Chemical compound [Na+].NCCCC(S(=O)(=O)[O-])N VCZJXEMVLNYRAS-UHFFFAOYSA-M 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000006260 foam Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 3
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical group CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 2
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 2
- 229920000570 polyether Polymers 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- QDWYPRSFEZRKDK-UHFFFAOYSA-M sodium;sulfamate Chemical compound [Na+].NS([O-])(=O)=O QDWYPRSFEZRKDK-UHFFFAOYSA-M 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract description 3
- 230000000996 additive effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 239000002904 solvent Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 241000594009 Phoxinus phoxinus Species 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- -1 sulfonic acid sodium salt Chemical class 0.000 description 2
- 125000000022 2-aminoethyl group Chemical group [H]C([*])([H])C([H])([H])N([H])[H] 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229940104261 taurate Drugs 0.000 description 1
- XOAAWQZATWQOTB-UHFFFAOYSA-N taurine Chemical compound NCCS(O)(=O)=O XOAAWQZATWQOTB-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
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)
- Paints Or Removers (AREA)
Abstract
The invention provides a water-based epoxy anticorrosive paint, which adopts specially-made modified graphene as an additive, and the modified graphene is grafted on graphene oxide through two types of sodium sulfamate, so that the dispersibility of the modified graphene in the paint is improved, and the paint has good mechanical property and better corrosion resistance. The invention also provides a preparation method of the coating.
Description
Technical Field
The invention relates to a water-based epoxy anticorrosive paint and a preparation method thereof.
Background
Metal corrosion causes huge economic losses to human production and life. The adoption of the anticorrosive paint is a metal protection measure which is relatively economic, effective and widely applied. The traditional anticorrosive paint is mainly solvent-based, and a large amount of toxic and harmful volatile substances are generated in the production and use processes of the traditional anticorrosive paint, so that the environmental pollution is relatively large. The water-based paint takes water as a solvent or a dispersant, and can effectively reduce environmental pollution. In general, the performance of water-based coatings, especially the anticorrosion performance, is still inferior to that of traditional solvent-based coatings. At present, people mostly adopt different types of additives or fillers to be added into the water paint to further enhance the performance of the water paint, but the methods still can not meet the high-standard industrial requirements.
Therefore, it is required to provide a water-based anticorrosive coating with excellent properties in various aspects to solve the problems in the prior art.
Disclosure of Invention
The invention provides a water-based epoxy anticorrosive paint, which adopts specially-made modified graphene as an additive, and the modified graphene is grafted on graphene oxide through two types of sodium sulfamate, so that the dispersibility of the modified graphene in the paint is improved, and the paint has good mechanical property and better corrosion resistance. The invention also provides a preparation method of the coating.
The above purpose of the invention is realized by the following technical scheme:
the raw materials of the water-based epoxy anticorrosive paint comprise water-based epoxy resin, a silane coupling agent, modified graphene, a defoaming agent, a flatting agent and a water-based epoxy resin curing agent;
the preparation method of the modified graphene comprises the following steps:
adding graphene oxide dispersion liquid into a reactor, starting stirring, adding 2- (2-aminoethyl) aminoethanesulfonic acid sodium salt, adjusting the pH value of a reaction system to 9-10 by using a sodium hydroxide aqueous solution, controlling the temperature of the reactor to be 70-80 ℃, reacting for 10-12 hours, adding aminopolyether sodium sulfonate, reacting for 10-12 hours, filtering and discharging materials, and cleaning with deionized water to be neutral to obtain an intermediate product;
adding the intermediate product obtained in the step one, sodium borohydride and ammonia water into a reactor, controlling the temperature of the reactor to be 80-90 ℃, starting stirring, reacting for 3-4 hours, filtering and discharging, washing with deionized water to be neutral, and drying to obtain the modified graphene;
preferably, the number average molecular weight of the sodium aminopolyether sulfonate is 550, and the structural formula is as follows:
NH2CH3CHCH2[OCH2CH(CH3)]nNHCH2CH2CH2SO3Na。
the graphene has a suitable specific surface area, can effectively isolate air and water molecules, and can improve the corrosion resistance of metal when used for coating. However, graphene has poor dispersibility in water, which limits its application in water-based coatings. According to the method, epoxy groups existing on the surface of graphene oxide are used as reaction active points, sodium sulfamate is grafted to the graphene oxide through ring opening, and sodium borohydride and ammonia water with reducibility are added to remove oxidizing groups on the surfaces of other graphene oxides, so that the modified graphene is obtained. The preparation method of the modified graphene limits the types of two sodium sulfamates, so that the grafted graphene surface has a proper molecular space structure, and the dispersion of the grafted graphene in the coating is facilitated. The modified graphene with good dispersibility is prepared by modifying the graphene oxide by the method disclosed by the invention and is used for the water-based epoxy resin coating, so that the coating has good mechanical property and excellent corrosion resistance.
It should be noted that the sodium aminopolyether sulfonate is a chemical substance known in the industry, belongs to a low molecular weight polymer, and the main component of the sodium aminopolyether sulfonate corresponds to the structural formula:
NH2CH3CHCH2[OCH2CH(CH3)]nNHCH2CH2CH2SO3na, where n is a positive integer, but which is not a pure substance where n is a fixed value. The method for obtaining the sodium aminopolyether sulfonate can be obtained by a preparation method commonly used in the field, and can also be obtained by commercial procurement, such as a product sold by Beijing Baiyuan chemical Co.
The graphene oxide dispersion liquid is obtained by placing graphene oxide in deionized water and performing ultrasonic dispersion for 3-4 hours, and the mass concentration of the graphene oxide dispersion liquid is 3-10%, preferably 5-8%.
The mass concentration of the sodium hydroxide aqueous solution is 10-12%.
In the preparation method of the modified graphene, the modified graphene comprises the following components in parts by weight:
the using amount of the graphene oxide dispersion liquid is 100 parts by mass;
the amount of the sodium 2- (2-aminoethyl) aminoethanesulfonate is 0.05-0.2 parts by mass;
the amount of the sodium amino polyether sulfonate is 0.4-0.8 part by mass;
the amount of the sodium borohydride is 0.4-0.6 parts by mass;
the amount of the ammonia water is 1-2 parts by mass.
The solid content of the water-based epoxy resin is 45-50%; the silane coupling agent is 3-aminopropyl triethoxysilane; the solid content of the waterborne epoxy resin curing agent is 40-45%.
The adhesive comprises the following components in parts by weight:
the using amount of the waterborne epoxy resin is 100 parts by mass;
the amount of the silane coupling agent is 1-2 parts by mass;
the using amount of the modified graphene is 2-3 parts by mass;
the using amount of the defoaming agent is 0.2-0.3 parts by mass;
the using amount of the flatting agent is 0.3-0.4 part by mass;
the amount of the water-based epoxy resin curing agent is 40-50 parts by mass.
The waterborne epoxy resin, the waterborne epoxy resin curing agent and other auxiliaries adopted in the coating can be prepared by the conventional method or obtained by commercial purchase from the raw materials commonly used in the field, and the implementation of the invention is not influenced.
Adding the water-based epoxy resin, the silane coupling agent, the modified graphene, the defoaming agent and the flatting agent into a reactor, starting stirring, adding the water-based epoxy resin curing agent after uniformly stirring, standing until foams are eliminated after uniformly stirring, and discharging to obtain the coating.
It should be noted that the content of the present invention which is not described can be performed by referring to the technical solutions commonly used in the art, and the implementation of the present invention is not affected.
The invention has the beneficial effects that: the modified graphene is further obtained by grafting 2- (2-aminoethyl) aminoethanesulfonic acid sodium salt and aminopolyether sulfonic acid sodium salt on graphene oxide. The modified graphene has good dispersibility in the water-based epoxy resin coating, so that the coating has good mechanical properties and the corrosion resistance of the coating is improved.
Detailed Description
The invention is further illustrated by the following specific examples. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
The examples and comparative examples used the following starting materials:
graphene oxide, beijing german island gold technologies ltd;
sodium 2- (2-aminoethyl) taurate, Hubei Chusheng Wis chemical Co., Ltd;
sodium aminopolyether sulfonate, Poly-EPS, Beijing Bai Yuan chemical Co., Ltd;
10% of sodium hydroxide aqueous solution with mass concentration;
ammonia, a669-212, siemer fly chemistry;
waterborne epoxy resin, F0704, shenzhen jitian chemical company;
waterborne epoxy resin curing agent, F0705, Shenzhen Jitian chemical Co
Antifoam, AGITAN156, german minnow chemical;
leveling agent, LA452, german minnow chemical.
The preparation method of the graphene oxide dispersion liquid comprises the following steps: the graphene oxide is placed in deionized water and subjected to ultrasonic dispersion for 4 hours, and the mass concentration of the graphene oxide is 8%.
The preparation method of the modified graphene 1 and 2 comprises the following steps:
adding graphene oxide dispersion liquid into a reactor, starting stirring, adding 2- (2-aminoethyl) aminoethanesulfonic acid sodium salt, adjusting the pH value of a reaction system to 10 by using a sodium hydroxide aqueous solution, controlling the temperature of the reactor at 80 ℃, reacting for 12 hours, adding aminopolyether sodium sulfonate, reacting for 12 hours, filtering and discharging materials, and cleaning with deionized water to be neutral to obtain an intermediate product;
and step two, adding the intermediate product obtained in the step one, sodium borohydride and ammonia water into a reactor, controlling the temperature of the reactor to be 90 ℃, starting stirring, reacting for 4 hours, filtering and discharging, washing with deionized water to be neutral, and drying to obtain the modified graphene.
The preparation method of the comparative modified graphene 1 comprises the following steps:
adding graphene oxide dispersion liquid into a reactor, starting stirring, adding 2- (2-aminoethyl) aminoethanesulfonic acid sodium salt, adjusting the pH value of a reaction system to 10 by using a sodium hydroxide aqueous solution, controlling the temperature of the reactor at 80 ℃, reacting for 12 hours, filtering and discharging, and cleaning with deionized water to be neutral to obtain an intermediate product;
and step two, adding the intermediate product obtained in the step one, sodium borohydride and ammonia water into a reactor, controlling the temperature of the reactor to be 90 ℃, starting stirring, reacting for 4 hours, filtering and discharging, washing with deionized water to be neutral, and drying to obtain the contrast modified graphene 1.
The preparation method of the comparative modified graphene 2 comprises the following steps:
adding graphene oxide dispersion liquid into a reactor, starting stirring, adding sodium aminopolyether sulfonate, adjusting the pH value of a reaction system to 10 by using a sodium hydroxide aqueous solution, controlling the temperature of the reactor at 80 ℃, reacting for 12 hours, filtering and discharging, and cleaning with deionized water to be neutral to obtain an intermediate product;
and step two, adding the intermediate product obtained in the step one, sodium borohydride and ammonia water into a reactor, controlling the temperature of the reactor to be 90 ℃, starting stirring, reacting for 4 hours, filtering and discharging, washing with deionized water to be neutral, and drying to obtain the contrast modified graphene 2.
The preparation method of the contrast modified graphene 3 comprises the following steps: adding the graphene oxide dispersion liquid into a reactor, starting stirring, adding 2- (2-aminoethyl) aminoethanesulfonic acid sodium salt, adjusting the pH value of a reaction system to 10 by using a sodium hydroxide aqueous solution, controlling the temperature of the reactor at 80 ℃, reacting for 12 hours, adding aminopolyether sodium sulfonate, reacting for 12 hours, filtering, discharging, washing with deionized water to be neutral, and drying to obtain the contrast modified graphene 3.
The preparation method of the comparative modified graphene 4 comprises the following steps:
adding graphene oxide dispersion liquid into a reactor, starting stirring, adding sodium aminopolyether sulfonate, adjusting the pH value of a reaction system to 10 by using a sodium hydroxide aqueous solution, controlling the temperature of the reactor at 80 ℃, reacting for 12 hours, adding 2- (2-aminoethyl) aminoethanesulfonic acid sodium, reacting for 12 hours, filtering and discharging, and washing with deionized water to be neutral to obtain an intermediate product;
and step two, adding the intermediate product obtained in the step one, sodium borohydride and ammonia water into a reactor, controlling the temperature of the reactor to be 90 ℃, starting stirring, reacting for 4 hours, filtering and discharging, washing with deionized water to be neutral, and drying to obtain the contrast modified graphene 4.
The amounts of the raw materials used in the preparation methods of the modified graphene and the comparative modified graphene are listed in table 1, in terms of the relative parts by mass between the components. Wherein the solid content of the Poly-EPS is 90%, and the mass parts of the sodium aminopolyether sulfonate listed in Table 1 are calculated according to the mass parts of the content in the Poly-EPS, and do not contain the mass parts of the solvent.
Table 1 preparation method of modified graphene and comparative modified graphene each raw material amount (parts by mass)
Examples and comparative example coating samples were prepared by the following method: adding the waterborne epoxy resin, the silane coupling agent, the modified graphene (the comparative example is replaced by the comparative modified graphene or not), the defoaming agent and the flatting agent into a reactor, starting stirring, adding the waterborne epoxy resin curing agent after uniformly stirring, standing until foams are eliminated after uniformly stirring, and discharging.
The amounts of the respective raw materials used in the preparation methods of examples and comparative examples are shown in table 2 in terms of relative parts by mass between the respective components.
TABLE 2 EXAMPLES AND COMPARATIVE EXAMPLES preparation methods the amounts (parts by mass) of the respective raw materials used
The samples obtained in the examples and comparative examples were subjected to performance tests according to the following test standards or methods:
1. the test standard of the impact resistance is GB/T1732-2020;
2. the test standard of the adhesive force is GB/T5210-2006;
3. and (4) performing a salt spray resistance test by using a salt spray tester, wherein the test standard is GB/T1771-2007.
The results of the performance tests on the examples and comparative examples are shown in Table 3.
Table 3 results of performance testing of examples and comparative examples
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (7)
1. The water-based epoxy anticorrosive paint is characterized in that raw materials comprise water-based epoxy resin, a silane coupling agent, modified graphene, a defoaming agent, a flatting agent and a water-based epoxy resin curing agent;
the preparation method of the modified graphene comprises the following steps:
adding graphene oxide dispersion liquid into a reactor, starting stirring, adding 2- (2-aminoethyl) aminoethanesulfonic acid sodium salt, adjusting the pH value of a reaction system to 9-10 by using a sodium hydroxide aqueous solution, controlling the temperature of the reactor to be 70-80 ℃, reacting for 10-12 hours, adding aminopolyether sodium sulfonate, reacting for 10-12 hours, filtering and discharging materials, and cleaning with deionized water to be neutral to obtain an intermediate product;
adding the intermediate product obtained in the step one, sodium borohydride and ammonia water into a reactor, controlling the temperature of the reactor to be 80-90 ℃, starting stirring, reacting for 3-4 hours, filtering and discharging, washing with deionized water to be neutral, and drying to obtain the modified graphene;
preferably, the number average molecular weight of the sodium aminopolyether sulfonate is 550, and the structural formula is as follows:
NH2CH3CHCH2[OCH2CH(CH3)]nNHCH2CH2CH2SO3Na。
2. the coating as claimed in claim 1, wherein the graphene oxide dispersion is obtained by placing graphene oxide in deionized water and performing ultrasonic dispersion for 3-4 hours, and the mass concentration is 3-10%, preferably 5-8%.
3. The coating according to claim 1, wherein the mass concentration of the aqueous solution of sodium hydroxide is 10 to 12%.
4. The coating according to claim 1, wherein in the preparation method of the modified graphene, the relative parts by mass of the following components are as follows:
the using amount of the graphene oxide dispersion liquid is 100 parts by mass;
the amount of the sodium 2- (2-aminoethyl) aminoethanesulfonate is 0.05-0.2 parts by mass;
the amount of the sodium amino polyether sulfonate is 0.4-0.8 part by mass;
the amount of the sodium borohydride is 0.4-0.6 parts by mass;
the amount of the ammonia water is 1-2 parts by mass.
5. The coating as claimed in claim 1, wherein the solid content of the water-based epoxy resin is 45-50%; the silane coupling agent is 3-aminopropyl triethoxysilane; the solid content of the waterborne epoxy resin curing agent is 40-45%.
6. The coating according to claim 1, characterized in that the relative parts by mass between the following components:
the using amount of the waterborne epoxy resin is 100 parts by mass;
the amount of the silane coupling agent is 1-2 parts by mass;
the using amount of the modified graphene is 2-3 parts by mass;
the using amount of the defoaming agent is 0.2-0.3 parts by mass;
the using amount of the flatting agent is 0.3-0.4 part by mass;
the amount of the water-based epoxy resin curing agent is 40-50 parts by mass.
7. A preparation method of the coating according to any one of claims 1 to 6, characterized by adding the water-based epoxy resin, the silane coupling agent, the modified graphene, the defoaming agent and the leveling agent into a reactor, starting stirring, adding the water-based epoxy resin curing agent after uniformly stirring, standing until foams are eliminated after uniformly stirring, and discharging to obtain the coating.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116042039A (en) * | 2023-02-01 | 2023-05-02 | 深圳市纳能科技有限公司 | Graphene heat dissipation damping coating and preparation method thereof |
| CN116285594A (en) * | 2023-05-09 | 2023-06-23 | 鞠慧 | Environment-friendly paint and preparation method thereof |
| CN116922909A (en) * | 2023-06-30 | 2023-10-24 | 安徽紫金新材料科技股份有限公司 | Easy-to-uncover film with barrier property and preparation method thereof |
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| CN111574918A (en) * | 2020-06-11 | 2020-08-25 | 金陵科技学院 | Preparation method of sulfonic acid type graphene/polyurethane-epoxy resin composite anticorrosive paint |
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| CN110423538A (en) * | 2019-08-13 | 2019-11-08 | 湖南工程学院 | A kind of preparation method of modified graphene/aqueous epoxy resins composite coating |
| CN111574918A (en) * | 2020-06-11 | 2020-08-25 | 金陵科技学院 | Preparation method of sulfonic acid type graphene/polyurethane-epoxy resin composite anticorrosive paint |
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Application publication date: 20211203 |