CN108047896B - Double-component coating and preparation method and application thereof - Google Patents

Double-component coating and preparation method and application thereof Download PDF

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CN108047896B
CN108047896B CN201711475889.9A CN201711475889A CN108047896B CN 108047896 B CN108047896 B CN 108047896B CN 201711475889 A CN201711475889 A CN 201711475889A CN 108047896 B CN108047896 B CN 108047896B
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component
component coating
graphene oxide
coating
silane coupling
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CN108047896A (en
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姚永健
荣仲尼
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Guangdong Good Brand Graphene Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C09D163/10—Epoxy resins modified by unsaturated compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

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Abstract

The invention provides a two-component coating and a preparation method and application thereof, wherein the two-component coating consists of a component A and a component B, wherein the component A comprises the following components in percentage by mass: 45-65 wt% of vinyl ester resin; 20-40 wt% of glass flakes; 1-10 wt% of graphene oxide modified by a silane coupling agent; additive to 100 wt%. The double-component coating provided by the invention has strong adhesive force to a base material, is not easy to fall off from the surface of the base material, and has a good effect of protecting the base material; and has good acid and alkali resistance and salt spray resistance, thereby achieving good anticorrosion effect.

Description

Double-component coating and preparation method and application thereof
Technical Field
The invention belongs to the field of coatings, and relates to a two-component coating and a preparation method and application thereof.
Background
Structures constructed from concrete and reinforced concrete are often subject to attack by corrosive agents during use, and if no or no anti-corrosive measures are taken against the structural materials during construction of the structure, the corrosive agents can damage the building structure and even render it useless. In particular, in industrial structures, the construction structures may be directly contacted with corrosive liquid, gaseous or other media, or may be eroded by industrial products or waste materials discharged from industrial production, thereby causing corrosion of the structural materials of the structures. In addition, if the admixture of the concrete is not used properly, the construction quality is problematic, or the construction raw material is problematic, etc., the corrosion phenomenon of the reinforced concrete can be caused by the reasons.
Corrosion of metals is the phenomenon in which metals are destroyed by electrochemical or chemical action of the surrounding medium. The metal corrosion spreads in various fields of national economy, and brings huge loss to the national economy. In industrially developed countries, the economic loss due to metal corrosion accounts for 1-4% of the total value of national economy, steel rusted due to corrosion accounts for about 20% of the total yield each year, and about 30% of equipment is scrapped due to metal corrosion. In China, the economic loss caused by metal corrosion accounts for 4% of the total value of national production every year. Accordingly, the excellent metal anticorrosive paint has been rapidly developed and widely used in various industries.
CN1073702A proposes a preparation method of a glass flake anticorrosive paint, which consists of epoxy resin, glass flakes, a solvent, a titanate coupling agent and a modified amine curing agent; CN1861717A proposes anticorrosive vinyl ester resin glass flake surface coating paint for wet flue gas desulfurization equipment; these coatings can prevent corrosion at the interface between the coating and the substrate, but due to compatibility problems of vinyl ester resin and glass flakes, etc., the anticorrosive coating can delaminate from the substrate, which affects the protective performance of the coating on the substrate. There is a need to develop a new coating to solve the above problems.
Disclosure of Invention
The invention aims to provide a two-component coating and a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the invention provides a two-component coating which is composed of a component A and a component B, wherein the component A comprises the following components in percentage by mass:
Figure BDA0001532808560000021
the two-component coating provided by the invention comprises vinyl ester resin, glass flakes and graphene oxide modified by a silane coupling agent, wherein the graphene oxide modified by the silane coupling agent can enable the vinyl ester resin and the glass flakes to be combined more tightly, the compatibility of the glass flakes and the vinyl ester resin is increased, and the coating is prevented from falling off due to phase separation and the like during application. And the silane coupling agent modified graphene oxide is added into the coating, so that the adhesion of the coating to a base material can be increased, the coating is not easy to fall off, and on the other hand, the graphene oxide has good acid and alkali resistance and anti-permeation effects, and the silane coupling agent modified graphene oxide is added into the coating, so that the acid and alkali resistance and anti-permeation performance of the coating can be increased.
In the present invention, the vinyl ester resin is 45 to 65 wt%, for example, 45 wt%, 50 wt%, 55 wt%, 60 wt%, 65 wt%, etc.
In the present invention, the content of the glass flake is 20 to 40 wt%, for example, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, or the like.
In the invention, the mass percentage of the graphene oxide modified by the silane coupling agent is 1-10 wt%, for example, 1 wt%, 3 wt%, 5 wt%, 7 wt%, 10 wt%, and the like.
Preferably, the preparation method of the graphene oxide modified by the silane coupling agent is as follows:
(1) dispersing graphene oxide in a solvent to obtain a dispersion liquid;
(2) adding a silane coupling agent into the dispersion liquid obtained in the step (1), stirring and dispersing, and then carrying out heating reaction to obtain a silane coupling agent modified graphene oxide dispersion liquid;
preferably, the specific surface area of the graphene oxide in the step (1) is more than or equal to 50m2G (e.g. 50 m)2/g、55m2/g、70m2/g、100m2/g、120m2/g、200m2/g、300m2,/g, etc.), more preferably 100m or more2/g。
Preferably, the solvent in the step (1) is a mixed solvent of xylene and n-butanol in a mass ratio of 5: 2.
Preferably, the concentration of the graphene oxide in the dispersion liquid in the step (1) is 20-30 wt%, such as 20 wt%, 22 wt%, 25 wt%, 27 wt%, 30 wt%, etc.
In the method for preparing the silane coupling agent modified graphene oxide, the silane coupling agent in the step (2) is a silane coupling agent with unsaturated double bonds.
In the invention, carboxyl groups carried by graphene oxide modified by a silane coupling agent react with hydroxyl groups carried by the surface of the glass flakes, unsaturated double bonds of the silane coupling agent and vinyl ester resin undergo polymerization, and the graphene oxide modified by the silane coupling agent serves as a compatilizer between the glass flakes and the vinyl ester resin, so that the glass flakes and the vinyl ester resin are combined more tightly, and the cohesion and the adhesion to a base material of the coating provided by the invention can be further enhanced.
Preferably, the silane coupling agent having an unsaturated double bond is KH 570.
Preferably, the mass ratio of the graphene oxide to the KH570 is 3: 1.
Preferably, the stirring and dispersing time of the step (2) is 15-30min, such as 15min, 20min, 22min, 25min, 27min, 30min and the like.
Preferably, the stirring speed of the stirring dispersion in the step (2) is 1000-.
Preferably, the temperature of the temperature-raising reaction in step (2) is 50 to 55 ℃, for example, 50 ℃, 51 ℃, 52 ℃, 53 ℃, 54 ℃, 55 ℃ and the like.
Preferably, the time of the temperature-rising reaction in the step (2) is 45-90min, such as 45min, 50min, 55min, 60min, 65min, 70min, 75min, 80min, 90min and the like.
Preferably, step (2) is followed by step (3): and (3) removing the solvent from the graphene oxide dispersion liquid modified by the silane coupling agent until the solid content of the reaction product is more than or equal to 90% (such as 90%, 92%, 94%, 96%, 98%, 100% and the like), thereby obtaining the graphene oxide modified by the silane coupling agent.
In the present invention, the vinyl ester resin is polymerized from methacrylic acid and bisphenol a epoxy resin.
In the present invention, the additives in component a include the following components:
Figure BDA0001532808560000041
in the present invention, the styrene is 5 to 20 wt%, for example, 5 wt%, 7 wt%, 10 wt%, 15 wt%, 20 wt%, etc.
In the present invention, the filler is contained in an amount of 5 to 20 wt%, for example, 5 wt%, 7 wt%, 10 wt%, 15 wt%, 20 wt%, or the like.
Preferably, the particle size of the filler is 1 to 100 μm (e.g., 1 μm, 5 μm, 10 μm, 50 μm, 75 μm, 100 μm, etc.), and more preferably 10 to 50 μm.
Preferably, the filler is any one or a combination of at least two of bentonite, titanium dioxide, talcum powder or feldspar powder; the composition with the mass ratio of titanium dioxide to talcum powder of 1:2 is further preferred.
In the invention, the mass percentage of the dispersant is 1-5 wt%, such as 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt% and the like.
Preferably, the dispersant is silicone and/or a hydroxyl-containing block copolymer; further preferred is silicone.
In the invention, the anti-settling agent is 1-3 wt%, for example, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, etc.
Preferably, the anti-settling agent is any one or a combination of at least two of fumed silica, polyamide wax or polyethylene wax; further preferred are polyamide waxes.
In the invention, the component B comprises the following components in percentage by mass:
80-92 wt% of xylene;
5-10 wt% of an initiator;
1-10 wt% of an accelerator.
In the invention, the mass percentage of the xylene is 80-92 wt%, such as 80 wt%, 82 wt%, 85 wt%, 87 wt%, 90 wt%, 92 wt% and the like.
In the invention, the mass percentage of the initiator is 5-10 wt%, such as 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt% and the like.
Preferably, the initiator is cumene hydroperoxide.
In the present invention, the mass percentage of the accelerator is 1 to 10 wt%, for example, 1 wt%, 2 wt%, 5 wt%, 7 wt%, 10 wt%, etc.
Preferably, the promoter is cobalt iso-octoate and/or N, N-dimethylaniline, further preferably cobalt iso-octoate.
In the present invention, the cobalt octoate promoter used may have a cobalt mass fraction of 2%, 4%, 6%, 8%, 10%, 12%, etc., and a cobalt mass fraction of 6% is preferred.
As a preferred technical scheme, the two-component coating consists of a component A and a component B.
The component A comprises the following components in percentage by mass:
Figure BDA0001532808560000061
the component B comprises the following components in percentage by mass:
85-90 wt% of dimethylbenzene;
6-10 wt% of an initiator;
1-5 wt% of an accelerator.
In a second aspect, the present invention provides a method for preparing the two-component coating as described above, the method comprising:
(1) mixing the vinyl ester resin, the graphene oxide modified by the silane coupling agent and part of additives according to the formula ratio, adding the glass flakes and the rest of additives, and uniformly mixing to obtain a component A;
(2) when the two-component coating is used, the component A and the component B are uniformly mixed according to the mass ratio of (6-12) to 1 to obtain the two-component coating.
In the present invention, the mass ratio (6-12):1 may be 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, etc.
The preparation method provided by the invention is simple and easy to implement, the combination of the vinyl ester resin and the glass flakes is more compact by using the graphene oxide modified by the silane coupling agent, the compatibility of the glass flakes and the vinyl ester resin is improved, and the delamination phenomenon between the coating and a substrate in application is further avoided.
As a preferred technical scheme, the preparation method comprises the following steps:
(1) mixing vinyl ester resin, graphene oxide modified by a silane coupling agent, styrene and a dispersing agent, sequentially adding an anti-settling agent, glass flakes and a filler, and uniformly mixing to obtain a component A;
(2) uniformly mixing dimethylbenzene, an initiator and an accelerator to obtain a component B;
(3) when the two-component coating is used, the component A and the component B are uniformly mixed according to the mass ratio of (6-12) to 1 to obtain the two-component coating.
In a third aspect, the present invention provides the use of a two-component coating as described above as an anticorrosive coating.
Preferably, the two-component coating is used as a concrete anticorrosion and/or a metal anticorrosion.
Compared with the prior art, the invention has the following beneficial effects:
the silane coupling agent modified graphene oxide contained in the two-component coating provided by the invention can enable the combination of vinyl ester resin and glass flakes to be more compact, can increase the adhesive force of the coating and a base material, and can prevent the coating from falling off in the using process as much as possible; on the other hand, the graphene oxide has acid and alkali resistance and permeability resistance, so that the coating has better performance, and can effectively protect the base material from being corroded and damaged when the coating is applied as an anticorrosive coating.
The double-component coating provided by the invention has strong adhesive force to a base material, the adhesive force to an iron base material can reach more than 15MPa, and the adhesive force to concrete can reach more than 5MPa, so that the double-component coating is not easy to fall off from the surface of the base material, and has a good effect of protecting the base material; and has good acid and alkali resistance and salt spray resistance, the acid and alkali resistance exceeds 1000h, the salt spray resistance exceeds 1600h, good anticorrosion effect is achieved, and the chloride ion permeability resistance is lower than 9 & 10-4a/[mg/(cm2·d)]The service life of the base material can be effectively prolonged, and the cost is indirectly saved. The preparation method provided by the invention is simple and feasible.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The two-component coating provided by the embodiment consists of a component A and a component B;
wherein the component A comprises the following components in percentage by mass:
Figure BDA0001532808560000081
wherein the vinyl ester resin is obtained by polymerizing methacrylic acid and bisphenol A epoxy resin; the graphene oxide modified by the silane coupling agent is graphene oxide modified by KH 570; the filler is titanium dioxide with the particle size of 50 mu m; the dispersant is organic silicon; the anti-settling agent is polyamide wax.
The component B comprises the following components in percentage by mass:
92 wt% of xylene;
5 wt% of an initiator;
3 wt% of an accelerator.
Wherein the initiator is cumene hydroperoxide and the accelerator is cobalt isooctanoate (6%).
The preparation method comprises the following steps:
(1) mixing vinyl ester resin, graphene oxide modified by a silane coupling agent, styrene and a dispersing agent, sequentially adding an anti-settling agent, glass flakes and a filler, and uniformly mixing to obtain the component A.
(2) And uniformly mixing the dimethylbenzene, the initiator and the accelerator to obtain the component B.
(3) When the coating is used, the component A and the component B are uniformly mixed according to the mass ratio of 9:1 to obtain the two-component coating.
Example 2
The two-component coating provided by the embodiment consists of a component A and a component B;
wherein the component A comprises the following components in percentage by mass:
Figure BDA0001532808560000091
wherein the vinyl ester resin is obtained by polymerizing methacrylic acid and bisphenol A epoxy resin; the graphene oxide modified by the silane coupling agent is graphene oxide modified by KH 570; the filler is bentonite, and the particle size is 70 mu m; the dispersing agent is organic silicon and a block copolymer containing hydroxyl; the anti-settling agent is polyethylene wax.
The component B comprises the following components in percentage by mass:
80 wt% of xylene;
10 wt% of an initiator;
10 wt% of accelerator.
Wherein the initiator is cumene hydroperoxide and the accelerator is cobalt isooctanoate (6%).
The preparation method comprises the following steps:
(1) mixing vinyl ester resin, graphene oxide modified by a silane coupling agent, styrene and a dispersing agent, sequentially adding an anti-settling agent, glass flakes and a filler, and uniformly mixing to obtain the component A.
(2) And uniformly mixing the dimethylbenzene, the initiator and the accelerator to obtain the component B.
(3) When the coating is used, the component A and the component B are uniformly mixed according to the mass ratio of 6:1 to obtain the two-component coating.
Example 3
The two-component coating provided by the embodiment consists of a component A and a component B;
wherein the component A comprises the following components in percentage by mass:
Figure BDA0001532808560000101
wherein the vinyl ester resin is obtained by polymerizing methacrylic acid and bisphenol A epoxy resin; the graphene oxide modified by the silane coupling agent is graphene oxide modified by KH 570; the filler is feldspar powder with the particle size of 1 mu m; the dispersant is a hydroxyl-containing block copolymer; the anti-settling agent is fumed silica.
The component B comprises the following components in percentage by mass:
90 wt% of xylene;
9 wt% of an initiator;
1 wt% of accelerator.
Wherein the initiator is cumene hydroperoxide and the accelerator is cobalt isooctanoate (6%).
The preparation method comprises the following steps:
(1) mixing vinyl ester resin, graphene oxide modified by a silane coupling agent, styrene and a dispersing agent, sequentially adding an anti-settling agent, glass flakes and a filler, and uniformly mixing to obtain the component A.
(2) And uniformly mixing the dimethylbenzene, the initiator and the accelerator to obtain the component B.
(3) When the coating is used, the component A and the component B are uniformly mixed according to the mass ratio of 12:1 to obtain the two-component coating.
Example 4
The two-component coating provided by the embodiment consists of a component A and a component B;
wherein the component A comprises the following components in percentage by mass:
Figure BDA0001532808560000111
wherein the vinyl ester resin is obtained by polymerizing methacrylic acid and bisphenol A epoxy resin; the graphene oxide modified by the silane coupling agent is graphene oxide modified by KH 570; the filler is titanium dioxide with the particle size of 10 mu m; the dispersant is organic silicon; the anti-settling agent is fumed silica and polyamide wax.
The component B comprises the following components in percentage by mass:
84 wt% of xylene;
8 wt% of an initiator;
8 wt% of accelerator.
Wherein the initiator is cumene hydroperoxide and the accelerator is cobalt isooctanoate (6%).
The preparation method comprises the following steps:
(1) mixing vinyl ester resin, graphene oxide modified by a silane coupling agent, styrene and a dispersing agent, sequentially adding an anti-settling agent, glass flakes and a filler, and uniformly mixing to obtain the component A.
(2) And uniformly mixing the dimethylbenzene, the initiator and the accelerator to obtain the component B.
(3) When the coating is used, the component A and the component B are uniformly mixed according to the mass ratio of 8:1 to obtain the two-component coating.
Example 5
The two-component coating provided by the embodiment consists of a component A and a component B;
wherein the component A comprises the following components in percentage by mass:
Figure BDA0001532808560000121
wherein the vinyl ester resin is obtained by polymerizing methacrylic acid and bisphenol A epoxy resin; the graphene oxide modified by the silane coupling agent is graphene oxide modified by KH 570; the filler is titanium dioxide with the particle size of 100 mu m; the dispersant is organic silicon; the anti-settling agent is a composition of polyamide wax and polyethylene wax.
The component B comprises the following components in percentage by mass:
88 wt% of xylene;
7 wt% of an initiator;
5 wt% of accelerator.
Wherein the initiator is cumene hydroperoxide and the accelerator is cobalt isooctanoate (6%).
The preparation method comprises the following steps:
(1) mixing vinyl ester resin, graphene oxide modified by a silane coupling agent, styrene and a dispersing agent, sequentially adding an anti-settling agent, glass flakes and a filler, and uniformly mixing to obtain the component A.
(2) And uniformly mixing the dimethylbenzene, the initiator and the accelerator to obtain the component B.
(3) When the coating is used, the component A and the component B are uniformly mixed according to the mass ratio of 10:1 to obtain the two-component coating.
Example 6
The two-component coating provided by the embodiment consists of a component A and a component B;
wherein the component A comprises the following components in percentage by mass:
Figure BDA0001532808560000131
wherein the vinyl ester resin is obtained by polymerizing methacrylic acid and bisphenol A epoxy resin; the graphene oxide modified by the silane coupling agent is graphene oxide modified by KH 570; the filler is titanium dioxide with the particle size of 50 mu m; the dispersant is organic silicon; the anti-settling agent is polyamide wax.
The component B comprises the following components in percentage by mass:
92 wt% of xylene;
5 wt% of an initiator;
3 wt% of an accelerator.
Wherein the initiator is cumene hydroperoxide and the accelerator is cobalt isooctanoate (6%).
The preparation method comprises the following steps:
(1) mixing vinyl ester resin, graphene oxide modified by a silane coupling agent, styrene and a dispersing agent, sequentially adding an anti-settling agent, glass flakes and a filler, and uniformly mixing to obtain the component A.
(2) And uniformly mixing the dimethylbenzene, the initiator and the accelerator to obtain the component B.
(3) When the coating is used, the component A and the component B are uniformly mixed according to the mass ratio of 9:1 to obtain the two-component coating.
Example 7
The two-component coating provided by the embodiment consists of a component A and a component B;
wherein the component A comprises the following components in percentage by mass:
Figure BDA0001532808560000141
wherein the vinyl ester resin is obtained by polymerizing methacrylic acid and bisphenol A epoxy resin; the graphene oxide modified by the silane coupling agent is graphene oxide modified by isobutyl triethoxysilane; the filler is titanium dioxide with the particle size of 50 mu m; the dispersant is organic silicon; the anti-settling agent is polyamide wax.
The component B comprises the following components in percentage by mass:
92 wt% of xylene;
5 wt% of an initiator;
3 wt% of an accelerator.
Wherein the initiator is cumene hydroperoxide and the accelerator is cobalt isooctanoate (6%).
The preparation method comprises the following steps:
(1) mixing vinyl ester resin, graphene oxide modified by a silane coupling agent, styrene and a dispersing agent, sequentially adding an anti-settling agent, glass flakes and a filler, and uniformly mixing to obtain the component A.
(2) And uniformly mixing the dimethylbenzene, the initiator and the accelerator to obtain the component B.
(3) When the coating is used, the component A and the component B are uniformly mixed according to the mass ratio of 9:1 to obtain the two-component coating.
Example 8
The two-component coating provided by the embodiment consists of a component A and a component B;
wherein the component A comprises the following components in percentage by mass:
Figure BDA0001532808560000151
wherein the vinyl ester resin is obtained by polymerizing methacrylic acid and phenolic epoxy resin; the graphene oxide modified by the silane coupling agent is graphene oxide modified by vinyl triethoxysilane; the additive is styrene.
The component B comprises the following components in percentage by mass:
95 wt% of xylene;
4 wt% of an initiator;
1 wt% of accelerator.
Wherein the initiator is cumene hydroperoxide and the accelerator is cobalt isooctanoate (6%).
The preparation method comprises the following steps:
(1) mixing vinyl ester resin, graphene oxide modified by a silane coupling agent and part of additives, adding glass flakes and the rest of additives, and uniformly mixing to obtain the component A.
(2) And uniformly mixing the dimethylbenzene, the initiator and the accelerator to obtain the component B.
(3) When the coating is used, the component A and the component B are uniformly mixed according to the mass ratio of 12:1 to obtain the two-component coating.
Comparative example 1
The difference from example 1 is only that the graphene oxide modified by the silane coupling agent is not added in the comparative example, and the contents of other components and the preparation method are not changed.
Comparative example 2
The difference from example 1 is only that the graphene oxide added in the present comparative example is not modified at all.
Comparative example 3
The difference from example 1 is only that the mass percentage of the silane coupling agent modified graphene oxide added in the comparative example is 15 wt%, while the mass percentage of the vinyl ester resin is 53 wt%, and the contents of other components and the preparation method are not changed.
The two-component coatings provided in examples 1-8 and comparative examples 1-3 were tested for performance and the results are shown in Table 1.
The two-component coating is coated on a base material, and the appearance of the coating is observed and divided into three appearance appearances of normal, multi-bubble and peeling.
The adhesion of the two-component coating to the base material is divided into the adhesion to the base material iron and the adhesion to the base material concrete.
To two-component coatingThe acid and alkali resistance test is carried out by adopting a soaking method. The test environment for acid resistance is 25% H2SO4The test environment for alkali resistance is 25% NaOH.
TABLE 1
Figure BDA0001532808560000171
As can be seen from the data in the table, the double-component coating provided by the invention has strong acid and alkali resistance, is not easy to fall off from the surface of a base material, and can be used as an anticorrosive coating for concrete or metal; as can be seen from the comparison between example 1 and comparative example 1, when the graphene oxide modified by the silane coupling agent is not added, the acid and alkali resistance of the two-component coating is affected, the adhesion with the substrate is reduced, and the two-component coating is easily peeled off from the surface of the substrate; as can be seen from the comparison between example 1 and comparative example 2, when the added graphene oxide is not modified at all, the two-component coating is also affected; it can be seen from the comparison between example 1 and comparative example 3 that when too much silane coupling agent modified graphene oxide is added, the graphene oxide is wasted and the coating cost is increased, although the performance of the coating still maintains a good range.
The applicant states that the present invention is illustrated by the above examples to the two-component coating material of the present invention, its preparation method and application, but the present invention is not limited to the above examples, i.e. it does not mean that the present invention must be implemented by the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (30)

1. The two-component coating is characterized by consisting of a component A and a component B, wherein the component A comprises the following components in percentage by mass:
Figure FDA0002936759330000011
the component B comprises the following components in percentage by mass:
80-92 wt% of xylene;
5-10 wt% of an initiator;
1-10 wt% of an accelerator;
the mass ratio of the component A to the component B is (6-12) to 1;
the preparation method of the silane coupling agent modified graphene oxide comprises the following steps:
(1) dispersing graphene oxide in a solvent to obtain a dispersion liquid;
(2) adding a silane coupling agent into the dispersion liquid obtained in the step (1), stirring and dispersing, and then carrying out heating reaction to obtain a silane coupling agent modified graphene oxide dispersion liquid;
and (3) the silane coupling agent in the step (2) is a silane coupling agent with unsaturated double bonds.
2. The two-component coating material according to claim 1, wherein the specific surface area of the graphene oxide in the step (1) is more than or equal to 50m2/g。
3. The two-component coating as claimed in claim 2, wherein the specific surface area of the graphene oxide in the step (1) is not less than 100m2/g。
4. The two-component coating material as claimed in claim 1, wherein the solvent in the step (1) is a mixed solvent of xylene and n-butanol at a mass ratio of 5: 2.
5. The two-component coating material according to claim 1, wherein the concentration of graphene oxide in the dispersion of step (1) is 20-30 wt%.
6. The two-component coating according to claim 1, wherein the silane coupling agent having an unsaturated double bond is KH 570.
7. The two-component coating as claimed in claim 6, wherein the mass ratio of graphene oxide to KH570 is 3: 1.
8. The two-component coating material according to claim 1, wherein the stirring dispersion time of step (2) is 15-30 min.
9. The two-component coating material as claimed in claim 1, wherein the stirring speed of the stirring dispersion in step (2) is 1000-2000 r/min.
10. The two-component coating material according to claim 1, wherein the temperature of the temperature-raising reaction in step (2) is 50-55 ℃.
11. The two-component coating material according to claim 1, wherein the time for the temperature-raising reaction in step (2) is 45-90 min.
12. The two-component coating according to claim 1, characterized in that step (2) is followed by step (3): and removing the solvent from the graphene oxide dispersion liquid modified by the silane coupling agent until the solid content of the reaction product is more than or equal to 90%, thereby obtaining the graphene oxide modified by the silane coupling agent.
13. The two-component coating according to claim 1, characterized in that the vinyl ester resin is polymerized from methacrylic acid and bisphenol a epoxy resin.
14. The two-component coating according to claim 1, wherein the additives in component a comprise the following components:
Figure FDA0002936759330000021
Figure FDA0002936759330000031
15. the two-component coating according to claim 14, characterized in that the particle size of the filler is 1-100 μm.
16. The two-component coating according to claim 15, characterized in that the particle size of the filler is 10-50 μm.
17. The two-component coating of claim 14, wherein the filler is any one or a combination of at least two of bentonite, titanium dioxide, or feldspar powder.
18. The two-component coating of claim 17, wherein the filler is titanium dioxide.
19. The two-component coating according to claim 14, characterized in that the dispersant is a silicone and/or a hydroxyl-containing block copolymer.
20. The two-component coating of claim 19, wherein the dispersant is a silicone.
21. The two-component coating of claim 14, wherein the anti-settling agent is any one of fumed silica, polyamide wax, or polyethylene wax, or a combination of at least two thereof.
22. The two-component coating of claim 21, wherein the anti-settling agent is a polyamide wax.
23. The two-component coating according to claim 1, characterized in that the initiator is cumene hydroperoxide.
24. The two-component coating according to claim 1, characterized in that the accelerator is cobalt iso-octoate and/or N, N-dimethylaniline.
25. The two-component coating of claim 24, wherein the accelerator is cobalt isooctanoate.
26. A two-component coating according to any of claims 14-22, characterized in that it consists of an a-component and a B-component;
the component A comprises the following components in percentage by mass:
Figure FDA0002936759330000041
the component B comprises the following components in percentage by mass:
85-90 wt% of dimethylbenzene;
6-10 wt% of an initiator;
1-5 wt% of an accelerator.
27. Method for the preparation of a two-component coating according to any of claims 1-26, characterized in that it comprises:
(1) mixing the vinyl ester resin, the graphene oxide modified by the silane coupling agent and part of additives according to the formula ratio, adding the glass flakes and the rest of additives, and uniformly mixing to obtain a component A;
(2) when the two-component coating is used, the component A and the component B are uniformly mixed according to the mass ratio of (6-12) to 1 to obtain the two-component coating.
28. The method of preparing a two-component coating according to claim 14, comprising the steps of:
(1) mixing vinyl ester resin, graphene oxide modified by a silane coupling agent, styrene and a dispersing agent, sequentially adding an anti-settling agent, glass flakes and a filler, and uniformly mixing to obtain a component A;
(2) uniformly mixing dimethylbenzene, an initiator and an accelerator to obtain a component B;
(3) when the two-component coating is used, the component A and the component B are uniformly mixed according to the mass ratio of (6-12) to 1 to obtain the two-component coating.
29. Use of a two-component coating according to any of claims 1-26, characterized in that the two-component coating is used as an anticorrosive coating.
30. Use according to claim 29, characterized in that the two-component coating is used as a concrete anticorrosion and/or metal anticorrosion coating.
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