CN110791178A - Hyperbranched polyether functionalized graphene/epoxy resin nano composite coating and preparation method and application thereof - Google Patents
Hyperbranched polyether functionalized graphene/epoxy resin nano composite coating and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to hyperbranched polyether functionalized graphene/epoxy resin nano composite coating and a preparation method and application thereof, wherein the nano composite coating is composed of a component A and a component B, the component A comprises mixed resin, antirust pigment, inorganic pigment, mineral powder and organic solvent, the component B is an epoxy resin curing agent, the mixed resin is composed of epoxy resin and hyperbranched polyether functionalized graphene, and the hyperbranched polyether functionalized graphene accounts for 2-10% of the epoxy resin by mass percent. The coating prepared from the hyperbranched polyether functionalized graphene/epoxy resin nano composite coating can effectively shield corrosive substances, shows more excellent corrosion resistance, and particularly obviously improves the acid resistance of the nano composite coating by 50 percent compared with that of a pure epoxy resin coating.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a hyperbranched polyether functionalized graphene/epoxy resin nano composite coating and a preparation method and application thereof.
Background
Epoxy resin coatings are widely used in a variety of applications due to their excellent adhesion, low shrinkage, good corrosion resistance and chemical resistance. But its wide application is limited due to its poor corrosion resistance. Accordingly, there have been a number of efforts to improve the corrosion resistance of epoxy coatings. The epoxy resin coating is chemically or physically modified by thermoplastic, siloxane modifier, liquid rubber and hyperbranched polymer. Thermoplastics can increase the viscosity of the coating system, which is detrimental to processing; siloxanes and liquid rubbers react to induce phase separation and are sensitive to processing, thereby affecting resin cure and flexibility of processing conditions. Despite the above advances, the existing improved methods do not achieve the desired corrosion resistance. Therefore, development of an efficient epoxy resin modifier is urgent.
Graphene Oxide (GO) has excellent properties of gas permeation resistance, chemical (acid/base/salt) resistance, thermal properties, mechanical strength, and the like. Thus, graphene-based materials have been extensively studied in the coatings industry in recent years. However, GO is a hydrophilic nano particle, and is seriously agglomerated, so that the conventional silane coupling agent cannot modify the GO well, and further the GO cannot reach a uniform dispersion state in water or a coating, and the wide application of the GO is limited due to the dispersion problem in a medium. Hyperbranched polymers have attracted considerable attention in recent years due to their unique structure and excellent properties. The unique structure of the high-solubility high-viscosity melt enables the high-solubility high-viscosity melt to have excellent properties such as low melt, low solution viscosity and the like. When graphene oxide and a hyperbranched polymer are combined together, a hyperbranched polymer functionalized with graphene oxide is obtained, and for this reason, a large number of research reports on hyperbranched polymer functionalized graphene oxide have been reported. However, most of the reports focus on the improvement of mechanical properties and the functionalization preparation method, and most of the functionalization methods comprise a plurality of preparation steps and are time-consuming and inefficient.
Disclosure of Invention
In order to solve the technical problems of complex preparation method of graphene oxide functionalization, poor dispersibility and poor epoxy resin corrosion resistance, the invention provides the hyperbranched polyether functionalized graphene/epoxy resin nano composite coating, and the preparation method and the application thereof.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a hyperbranched polyether functionalized graphene/epoxy resin nano composite coating is composed of a component A and a component B, wherein the component A comprises the following components in parts by weight: 30-40 parts of mixed resin, 10-15 parts of antirust pigment, 15-25 parts of inorganic pigment, 10-15 parts of mineral powder and 10-30 parts of organic solvent, wherein the component B is 38-55 parts of epoxy resin curing agent;
the mixed resin is composed of epoxy resin and hyperbranched polyether functionalized graphene, the hyperbranched polyether functionalized graphene accounts for 2% -10% of the mass percent of the epoxy resin, and the hyperbranched polyether functionalized graphene is prepared by one-step reaction of graphene oxide and hyperbranched polyether epoxy resin under the action of a catalyst.
Further, M of the hyperbranched polyether epoxy resinn1200g/mol to 2500g/mol, wherein the hyperbranched polyether epoxy resin is obtained by reacting resorcinol and trimethylolpropane triglycidyl ether at 100 ℃ under the action of a catalyst tetrabutylammonium bromide;
the preparation method of the hyperbranched polyether functionalized graphene comprises the following steps: adding graphene oxide and hyperbranched polyether epoxy resin into a DMF (dimethyl formamide) solvent according to the mass ratio of 1:100 at room temperature, carrying out ultrasonic treatment, then adding tetrabutylammonium bromide with a catalytic amount, heating to 80 ℃ under stirring, reacting for 10 hours, cooling to room temperature after the reaction is finished, washing with water, centrifuging, and filtering to obtain the hyperbranched polyether functionalized graphene.
Further, the epoxy resin is bisphenol A type epoxy resin.
Further, the antirust pigment is zinc molybdate and/or zinc sulfate, and the particle size of the antirust pigment is 800 meshes.
Further, the inorganic pigment is one or more of ferric oxide, zinc oxide and titanium dioxide, and the particle size of the inorganic pigment is 800-2000 meshes.
Further, the mineral powder is mica and/or talcum powder, and the particle size of the mineral powder is 800-1250 meshes.
Further, the organic solvent is xylene and butanone mixed according to the volume ratio of 7: 3.
Further, the epoxy resin curing agent is LITE 3000.
The invention also provides a preparation method of the hyperbranched polyether functionalized graphene/epoxy resin nano composite coating, which comprises the following steps:
(1) weighing raw materials of the component A and the component B according to a formula; stirring and mixing mixed resin consisting of epoxy resin and hyperbranched polyether functionalized graphene and a part of organic solvent until the mixed resin is uniform and transparent, then adding anti-rust pigment, inorganic pigment and mineral powder for premixing under the stirring state, and transferring the mixture into a cone mill for grinding to form uniformly dispersed color paste;
(2) and stirring the epoxy resin curing agent, the rest of the organic solvent and the color paste until the mixture is uniform and transparent to obtain the hyperbranched polyether functionalized graphene/epoxy resin nano composite coating, coating the hyperbranched polyether functionalized graphene/epoxy resin nano composite coating on the surface of the matrix, and curing at room temperature for 2-7 days to obtain the coating of the nano composite coating.
The last aspect of the invention provides the hyperbranched polyether functionalized graphene/epoxy resin nano composite coating applied to corrosion prevention of the surface of a metal matrix. The nano composite coating has the corrosion resistance especially shown in that the acid corrosion resistance is improved by 50 percent compared with the acid corrosion resistance of pure epoxy resin, and the nano composite coating has excellent corrosion resistance.
The beneficial technical effects are as follows:
according to the invention, hyperbranched polyether epoxy resin and graphene oxide are grafted to form hyperbranched polyether functionalized graphene, and the hyperbranched polyether functionalized graphene is added into epoxy resin as a modifier, so that on one hand, as the hyperbranched polyether epoxy resin is grafted on the graphene oxide, the dispersibility of the graphene oxide in an epoxy resin matrix is better than that of other common modifying means such as silane coupling agent and other modified graphene oxide, the compatibility of each component is better, thus the network structure in a coating formed during curing is more uniform, and as the graphene oxide has better impermeability, the graphene oxide can be uniformly dispersed in the network structure to exert more effective impermeability; on the other hand, due to the fact that the hyperbranched polymer at one end of the hyperbranched polyether functionalized graphene contains a plurality of terminal active groups, crosslinking points for forming an epoxy resin network are increased, and crosslinking density is increased, so that the epoxy resin network in the prepared nano composite coating has smaller micropores, a diffusion path is narrower, the nano composite coating has more excellent corrosion resistance under the synergistic effect of the graphene oxide and the hyperbranched polyether epoxy resin, and the effect that 1+1 is larger than 2 is achieved.
The coating prepared from the hyperbranched polyether functionalized graphene/epoxy resin nano composite coating has a narrower diffusion path, can effectively shield corrosive substances, has a lower corrosion rate, shows more excellent corrosion resistance, and particularly obviously improves the acid resistance of the nano composite coating by 50 percent compared with a pure epoxy resin coating.
Drawings
Fig. 1 is a schematic diagram of a reaction process of hyperbranched polyether functionalized graphene.
FIG. 2 is an electrochemical impedance spectrum of a coated steel sheet obtained by curing the coatings of coating examples 2 to 5 and comparative example 1 after being soaked in a 3.5 wt% NaCl solution for 5 days. Wherein 0% of EHBPE-GO represents a coated steel plate obtained by curing a pure epoxy resin coating in comparative example 1, 3% of EHBPE-GO represents a coated steel plate obtained by curing a nano composite coating in example 2, 5% of EHBPE-GO represents a coated steel plate obtained by curing a nano composite coating in example 3, 8% of EHBPE-GO represents a coated steel plate obtained by curing a nano composite coating in example 4, and 10% of EHBPE-GO represents a coated steel plate obtained by curing a nano composite coating in example 4.
FIG. 3 is a graph of electrochemical Bode of coated steel plates obtained by curing the 8 wt% EHBPE-GO nano composite coating of example 4, in which (a) is a Bode modulus graph and (b) is a Bode phase graph, immersed in 3.5 wt% NaCl solution for different periods of time.
FIG. 4 is a graph of the soaking time of a coated steel plate cured by the 8 wt% EHBPE-GO nano composite coating in a 3.5 wt% NaCl solution as a function of the corrosion depth in example 4.
Detailed Description
The invention is further described below with reference to the figures and specific examples, without limiting the scope of the invention.
The preparation method of the hyperbranched polyether epoxy resin comprises the following steps: resorcinol (4.40g,0.04mol) and trimethylolpropane triglycidyl ether (36.28g,0.12mol) were added into a three-necked flask equipped with mechanical stirring, a thermometer and a nitrogen inlet and outlet, heated to 100 ℃ under nitrogen protection, and then added with tetrabutylammonium bromide (1.93g, 0.006mmol) as a catalyst to react for 48 h; after the reaction is finished, cooling to room temperature, adding 100ml of THF to dissolve the product, then pouring the solution into a large amount of hot water, fully stirring, standing, removing the upper layer liquid, and repeating the step for 3 times to remove the catalyst; adding a small amount of THF to the remaining lower layer liquid, dissolving, and adding MgSO4Drying, vacuum-filtering, rotary-evaporating the obtained filtrate to remove part of THF, precipitating the liquid into diethyl ether for 3 times, and stirring to remove the upper layer liquid to remove polymer with low relative molecular mass; and (3) removing the solvent by rotary evaporation to obtain a light yellow transparent viscous liquid, namely the hyperbranched polyether epoxy resin, hereinafter abbreviated as EHBPE, and obtaining the Mn of the hyperbranched polyether epoxy resin which is 2000g/mol through GPC detection and calculation.
Example 1
The preparation method of the hyperbranched polyether functionalized graphene comprises the following steps: at room temperature of 25 ℃, 10.2mg of graphene oxide and 1.019g of EHBPE prepared by the method are added into 40mLDMF, ultrasonic treatment (the frequency is 5000Hz) is carried out for 30 minutes, then 0.05g of tetrabutylammonium bromide is added, the mixture is heated to 80 ℃ under the condition that the magnetic stirring rotating speed is 300rpm, after reaction is carried out for 10 hours, the reaction system is cooled to room temperature, and washing, centrifuging and filtering are carried out to obtain the graphene oxide modified hyperbranched polyether epoxy resin, which is hereinafter abbreviated as EHBPE-GO.
The reaction process is shown in figure 1.
Fourier infrared spectrum test is carried out on the prepared EHBPE-GO, and the result is 1750cm-1Has a carbonyl peak on the surface of graphene oxide of 2960cm-1～2880cm-1Is located at 1231cm which is attributed to an aliphatic-C-H stretching vibration peak-1And 1100cm-1The positions of the two vibration peaks respectively belong to Ph-O-C and C-O-C stretching vibration peaks at 908cm-1And 843cm-1Characteristic absorption peak of epoxy group, which indicates that EHBPE is successfully grafted on the end of GO.
Example 2
A hyperbranched polyether functionalized graphene/epoxy resin nano composite coating is composed of a component A and a component B, wherein the component A comprises the following components in parts by weight: 33.4 parts of mixed resin, antirust pigment: 6 parts of zinc molybdate, 8 parts of zinc phosphate and inorganic pigment: 20 parts of ferric oxide, and mineral powder: 4.8 parts of mica, 7.8 parts of talcum powder, and organic solvent: 20 parts of dimethylbenzene and butanone are mixed according to the volume ratio of 7:3,
the component B is 300043.6 parts of epoxy resin curing agent LITE;
the mixed resin is composed of the hyperbranched polyether functionalized graphene prepared in the embodiment 1 and bisphenol A epoxy resin, wherein the weight of the hyperbranched polyether functionalized graphene accounts for about 3% of that of the bisphenol A epoxy resin, namely 1 part of the hyperbranched polyether functionalized graphene and 32.4 parts of the bisphenol A epoxy resin.
Example 3
The hyperbranched polyether functionalized graphene/epoxy resin nanocomposite coating of the present embodiment is the same as that of embodiment 2, except that the weight of the hyperbranched polyether functionalized graphene is about 5% of that of the bisphenol a epoxy resin, i.e., 1.6 parts of the hyperbranched polyether functionalized graphene and 31.8 parts of the bisphenol a epoxy resin.
Example 4
The hyperbranched polyether functionalized graphene/epoxy resin nanocomposite coating of the embodiment is the same as that of the embodiment 2, except that the weight of the hyperbranched polyether functionalized graphene accounts for about 8% of that of the bisphenol a epoxy resin, namely, 2.5 parts of the hyperbranched polyether functionalized graphene and 30.9 parts of the bisphenol a epoxy resin.
Example 5
The hyperbranched polyether functionalized graphene/epoxy resin nanocomposite coating of the present embodiment is the same as that of embodiment 2, except that the weight of the hyperbranched polyether functionalized graphene accounts for about 10% of the weight of the bisphenol a epoxy resin, that is, 3.1 parts of the hyperbranched polyether functionalized graphene and 30.3 parts of the bisphenol a epoxy resin.
Example 6
A hyperbranched polyether functionalized graphene/epoxy resin nano composite coating is composed of a component A and a component B, wherein the component A comprises the following components in parts by weight: 40 parts of mixed resin, antirust pigment: 4 parts of zinc molybdate, 6 parts of zinc phosphate and inorganic pigment: 25 parts of ferric oxide, mineral powder: 6 parts of mica, 9 parts of talcum powder, and organic solvent: 30 parts of dimethylbenzene and butanone are mixed according to the volume ratio of 7:3,
the component B is epoxy resin curing agent LITE 300053 parts;
the mixed resin is composed of the hyperbranched polyether functionalized graphene prepared in the embodiment 1 and bisphenol A epoxy resin, wherein the weight of the hyperbranched polyether functionalized graphene accounts for about 8.1% of that of the bisphenol A epoxy resin, namely 3 parts of the hyperbranched polyether functionalized graphene and 37 parts of the bisphenol A epoxy resin.
Example 7
A hyperbranched polyether functionalized graphene/epoxy resin nano composite coating is composed of a component A and a component B, wherein the component A comprises the following components in parts by weight: 30 parts of mixed resin, antirust pigment: 5 parts of zinc molybdate, 7 parts of zinc phosphate and inorganic pigment: 15 parts of ferric oxide, and mineral powder: 3 parts of mica, 7 parts of talcum powder, and organic solvent: mixing dimethylbenzene and butanone according to the volume ratio of 7:3 to prepare 12 portions,
the component B is 300039.2 parts of epoxy resin curing agent LITE;
the mixed resin is composed of the hyperbranched polyether functionalized graphene prepared in the embodiment 1 and bisphenol A epoxy resin, wherein the weight of the hyperbranched polyether functionalized graphene accounts for 7.9% of the weight of the bisphenol A epoxy resin, namely 2.2 parts of the hyperbranched polyether functionalized graphene and 27.8 parts of the bisphenol A epoxy resin.
Comparative example 1
This comparative example differs from example 2 in that no EHBPE-GO is added and is a pure epoxy coating (abbreviated DGEBA).
Example 8
Example 2 a method of preparing a coating comprising the steps of:
(1) weighing raw materials of the component A and the component B according to a formula; respectively stirring and mixing the mixed resin and the epoxy resin with a part of organic solvent until the mixed resin and the epoxy resin are uniform and transparent, then respectively adding the anti-rust pigment, the inorganic pigment and the mineral powder under the stirring state for premixing, and transferring the mixture into a cone mill for grinding to form uniformly dispersed color paste;
(2) and stirring the epoxy resin curing agent, the rest of the organic solvent and the color paste to be uniform and transparent, coating the mixture on the surface of the matrix, and curing the mixture at room temperature for 7 days to obtain the coating of the hyperbranched polyether functionalized graphene/epoxy resin nano composite coating in the embodiment 2.
The coating preparation methods of the coatings of examples 3 to 7 and comparative example 1 were the same as those of example 2.
Example 9
A Q235 low-carbon steel plate (100mm multiplied by 50mm multiplied by 1mm) is used as a metal matrix, a No. 400 sand paper is used for grinding the steel plate, abrasive dust is removed, then acetone and ethanol are used for cleaning, then the coatings of the examples 2-5 and the comparative example 1 are coated on the front surface and the back surface of the Q235 steel plate according to the preparation method of the coating in the example 8, and the coating is cured for one week at room temperature, so that the coated steel plate with the coating thickness of about 30 mu m is obtained.
Test of Corrosion resistance
To accelerate the failure process of the coating, 10 wt% H was chosen2SO4And carrying out an electrochemical corrosion test by using the solution, a 5 wt% NaOH solution and deionized water as corrosion media. The coated steel sheets obtained by coating Q235 with the coatings of examples 2 to 5 and comparative example 1 and curing the coatings were respectively immersed in 10 wt% of H2SO4In the solution, 5 wt% NaOH solution and deionized water, the depth of the coated steel plate from the surface of the solution is 7cm, and the test time of soaking is 80 days at most.
An electrochemical impedance spectrogram of a coated steel plate obtained by curing the coatings of the coating examples 2-5 and the comparative example 1 after being soaked in a 3.5 wt% NaCl solution for 5 days is shown in fig. 2, 0% EHBPE-GO in fig. 2 represents a coated steel plate obtained by curing a pure epoxy resin coating of the comparative example 1, 3% EHBPE-GO represents a coated steel plate obtained by curing a nano composite coating of the example 2, 5% EHBPE-GO represents a coated steel plate obtained by curing a nano composite coating of the example 3, 8% EHBPE-GO represents a coated steel plate obtained by curing a nano composite coating of the example 4, and 10% EHBPE-GO represents a coated steel plate obtained by curing a nano composite coating of the example 4. As can be seen from fig. 2, the higher the impedance value is, the better the corrosion resistance is, that is, the corrosion resistance of the coating of the hyperbranched polyether functionalized graphene/epoxy resin nanocomposite coating is significantly better than that of the coating of a pure epoxy resin coating, which indicates that EHBPE-GO can significantly improve the corrosion resistance of the epoxy resin coating. In addition, when the EHBPE-GO is used in an amount of 8 wt%, the nanocomposite coating is best resistant to corrosion.
The results obtained at shorter test times are not sufficient to reveal the protective properties of the nanocomposite coating. Thus, electrochemical corrosion was tested at longer soak times, as shown in FIG. 3, which is a graph of electrochemical Bode of example 4(8 wt% EHBPE-GO) nanocomposite coating cured by soaking in 3.5 wt% NaCl solution for different periods of time (a) for Bode modulus and (b) for Bode phase, for test periods of 1 day, 2 days, 5 days, 15 days, 30 days, 50 days and 80 days. As is clear from FIG. 3, the impedance at 0.1 Hz was higher than 107. omega. cm after 80 days of immersion in (a)2The nano composite coating still has better corrosion resistance and can well protect metal. However, as the soaking test is performed at a low frequency, the resistance value of the nanocomposite coating is not decreased but increased, which is not consistent with the conventional phenomenon. Mainly because in the corrosion process, the corrosion ions in the solution can penetrate through the substrate for a long time no matter how dense the coating is, once the corrosion ions in the solution are contacted with metal, further corrosion reaction occurs, corrosion produces a corrosion product film, and the film can play a role of a protective layer.
Example 4(8 wt% EHBPE-GO) nanocomposite coating curing the obtained coated steel plate in 3.5 wt% NaCl solution, the graph of the relationship between the immersion time and the corrosion depth is shown in fig. 4, and it can be seen from fig. 4 that, for DGEBA (pure epoxy resin) coating, the corrosion depth increases with the increase of the immersion time; while the corrosion depth of the nanocomposite coating containing 8 wt% EHBPE-GO was significantly lower than the pure epoxy coating and did not increase with time. For the nanocomposite coating containing 8 wt% EHBPE-GO, the corrosion depth remained substantially constant with the soaking time, indicating excellent corrosion resistance over the 80 day soaking time. The electrochemical performance parameters of the example 4(8 wt% EHBPE-GO) nanocomposite coating and the neat epoxy coating of comparative example 1 after 80 days immersion in 3.5 wt% NaCl solution are shown in Table 1.
TABLE 1 electrochemical Performance parameters of the coating after 80 days immersion in 3.5% by weight NaCl solution
Electrochemical performance parameters of example 4(8 wt% EHBPE-GO) nanocomposite coatings and the neat epoxy coatings of comparative example 1 after 80 days immersion in 10 wt% H2SO4 solution, 5 wt% NaOH solution, and deionized water solution, respectively, were also tested for salt spray, and the data are shown in table 2.
TABLE 2 electrochemical performance parameters of the coatings after 80 days immersion in 10 wt% H2SO4 solution, 5 wt% NaOH solution and deionized water solution, respectively
As can be seen from Table 2, both DGEBA (pure epoxy) coatings and 8 wt% EHBPE-GO/DGEBA (nanocomposite coatings) showed better resistance to deionized water and 5 wt% NaOH solutions. But for 10 wt% H2SO4There were significant differences in the resistance of the solutions. The result shows that the acid resistance of the nano composite coating is obviously improved by 50 percent compared with that of a pure epoxy resin coating.
Even in a highly crosslinked network, some micropores are present. The channels formed by the larger micropores provide channels for the diffusion of corrosive substances when the coated steel sheet is immersed in a corrosive solution. The weaker the corrosion resistance of the material, the wider the diffusion path, i.e., the larger the micropores in the material. The diffusion path in the neat epoxy coating is wider than the diffusion path in the nanocomposite coating, and once the neat epoxy coating is penetrated by the electrolyte solution, the corrosion process is rapidly accelerated and the corrosion rate increases. In the invention, the hyperbranched polyether epoxy resin and the graphene oxide are grafted to form hyperbranched polyether functionalized graphene, and the hyperbranched polyether functionalized graphene is added into the epoxy resin as a modifier, so that on one hand, the dispersibility of the hyperbranched polyether epoxy resin in an epoxy resin matrix is better than that of other general modification means such as silane coupling agent and other modified graphene oxide, and the compatibility of each component is better, so that the network structure in a coating formed during curing is more uniform, and the graphene oxide can be uniformly dispersed in the network structure to play more effective impermeability because the graphene oxide has better impermeability; on the other hand, due to the fact that the hyperbranched polymer at one end of the hyperbranched polyether functionalized graphene contains a plurality of terminal active groups, crosslinking points for forming an epoxy resin network are increased, and crosslinking density is increased, so that the epoxy resin network in the prepared nano composite coating has smaller micropores, a diffusion path is narrower, the nano composite coating has more excellent corrosion resistance under the synergistic effect of the graphene oxide and the hyperbranched polyether epoxy resin, and the effect that 1+1 is larger than 2 is achieved.
In conclusion, the coating prepared from the hyperbranched polyether functionalized graphene/epoxy resin nano composite coating has a narrower diffusion path, can effectively shield corrosive substances, has a lower corrosion rate, and shows more excellent corrosion resistance. The nano composite coating can be applied to the surface corrosion prevention of a metal matrix, and the formed nano composite coating has a better corrosion prevention effect.
Claims (10)
1. The hyperbranched polyether functionalized graphene/epoxy resin nano composite coating is characterized by consisting of a component A and a component B, wherein the component A comprises the following components in parts by weight: 30-40 parts of mixed resin, 10-15 parts of antirust pigment, 15-25 parts of inorganic pigment, 10-15 parts of mineral powder and 10-30 parts of organic solvent, wherein the component B is 38-55 parts of epoxy resin curing agent;
the mixed resin is composed of epoxy resin and hyperbranched polyether functionalized graphene, the hyperbranched polyether functionalized graphene accounts for 2% -10% of the mass percent of the epoxy resin, and the hyperbranched polyether functionalized graphene is prepared by one-step reaction of graphene oxide and hyperbranched polyether epoxy resin under the action of a catalyst.
2. The hyperbranched polyether functionalized graphene/epoxy resin nanocomposite coating of claim 1, wherein M of the hyperbranched polyether epoxy resin isn1200g/mol to 2500g/mol, wherein the hyperbranched polyether epoxy resin is obtained by reacting resorcinol and trimethylolpropane triglycidyl ether at 100 ℃ under the action of a catalyst tetrabutylammonium bromide;
the preparation method of the hyperbranched polyether functionalized graphene comprises the following steps: adding graphene oxide and hyperbranched polyether epoxy resin into a DMF (dimethyl formamide) solvent according to the mass ratio of 1:100 at room temperature, carrying out ultrasonic treatment, then adding tetrabutylammonium bromide with a catalytic amount, heating to 80 ℃ under stirring, reacting for 10 hours, cooling to room temperature after the reaction is finished, washing with water, centrifuging, and filtering to obtain the hyperbranched polyether functionalized graphene.
3. The hyperbranched polyether-functionalized graphene/epoxy resin nanocomposite coating of claim 1, wherein the epoxy resin is bisphenol a epoxy resin.
4. The hyperbranched polyether-functionalized graphene/epoxy resin nanocomposite coating of claim 1, wherein the rust preventive pigment is zinc molybdate and/or zinc sulfate, and the particle size of the rust preventive pigment is 800 meshes.
5. The hyperbranched polyether functionalized graphene/epoxy resin nanocomposite coating according to claim 1, wherein the inorganic pigment is one or more of ferric oxide, zinc oxide and titanium dioxide, and the particle size of the inorganic pigment is 800-2000 meshes.
6. The hyperbranched polyether functionalized graphene/epoxy resin nanocomposite coating of claim 1, wherein the mineral powder is mica and/or talc, and the particle size of the mineral powder is 800-1250 mesh.
7. The hyperbranched polyether functionalized graphene/epoxy resin nanocomposite coating of claim 1, wherein the organic solvent is a mixture of xylene and butanone in a volume ratio of 7: 3.
8. The hyperbranched polyether-functionalized graphene/epoxy resin nanocomposite coating of claim 1, wherein the epoxy resin curing agent is LITE 3000.
9. A preparation method of the hyperbranched polyether functionalized graphene/epoxy resin nanocomposite coating according to any one of claims 1 to 8, comprising the following steps:
(1) weighing raw materials of the component A and the component B according to a formula; stirring and mixing mixed resin consisting of epoxy resin and hyperbranched polyether functionalized graphene and a part of organic solvent until the mixed resin is uniform and transparent, then adding anti-rust pigment, inorganic pigment and mineral powder for premixing under the stirring state, and transferring the mixture into a cone mill for grinding to form uniformly dispersed color paste;
(2) and stirring the epoxy resin curing agent, the rest of the organic solvent and the color paste until the mixture is uniform and transparent to obtain the hyperbranched polyether functionalized graphene/epoxy resin nano composite coating, coating the hyperbranched polyether functionalized graphene/epoxy resin nano composite coating on the surface of the matrix, and curing at room temperature for 2-7 days to obtain the coating of the nano composite coating.
10. The hyperbranched polyether functionalized graphene/epoxy resin nanocomposite coating according to any one of claims 1 to 8 is applied to corrosion prevention of the surface of a metal matrix.
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| CN112143346A (en) * | 2020-10-09 | 2020-12-29 | 东北大学 | Graphene oxide grafted nano Fe2O3Preparation method of/epoxy composite coating |
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| CN112143346A (en) * | 2020-10-09 | 2020-12-29 | 东北大学 | Graphene oxide grafted nano Fe2O3Preparation method of/epoxy composite coating |
| CN112143346B (en) * | 2020-10-09 | 2021-06-11 | 东北大学 | Graphene oxide grafted nano Fe2O3Preparation method of/epoxy composite coating |
| CN112625551A (en) * | 2021-01-20 | 2021-04-09 | 开封大学 | Hydroxyl-terminated hyperbranched poly (amine-ester) modified graphene oxide/epoxy resin nano composite coating as well as preparation method and application thereof |
| CN112625551B (en) * | 2021-01-20 | 2022-06-07 | 开封大学 | Hydroxyl-terminated hyperbranched poly (amine-ester) modified graphene oxide/epoxy resin nano composite coating as well as preparation method and application thereof |
| CN114032004A (en) * | 2021-11-03 | 2022-02-11 | 重庆三峡油漆股份有限公司 | Water-based epoxy coating and preparation method thereof |
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| CN116332212A (en) * | 2023-04-13 | 2023-06-27 | 衡阳市建衡实业有限公司 | Preparation method of polyaluminum chloride |
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