CN112694813A - Single-component graphene zinc powder coating and preparation method thereof - Google Patents
Single-component graphene zinc powder coating and preparation method thereof Download PDFInfo
- Publication number
- CN112694813A CN112694813A CN202011582266.3A CN202011582266A CN112694813A CN 112694813 A CN112694813 A CN 112694813A CN 202011582266 A CN202011582266 A CN 202011582266A CN 112694813 A CN112694813 A CN 112694813A
- Authority
- CN
- China
- Prior art keywords
- graphene
- zinc powder
- powder coating
- zinc
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- 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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
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 relates to a single-component graphene zinc powder coating and a preparation method thereof, wherein the single-component graphene zinc powder coating is mainly prepared from the following components in parts by weight:
Description
Technical Field
The invention relates to a single-component graphene zinc powder coating and a preparation method thereof, which are applied to the field of heavy anti-corrosion coating production.
Background
Heavy-duty anticorrosive coatings refer to anticorrosive coatings that can be applied in a relatively harsh corrosive environment compared to conventional anticorrosive coatings and have a longer protection period than conventional anticorrosive coatings. The dry film thickness of heavy-duty anticorrosive coatings is generally above 200 μm or above 300 μm, even up to 500-1000 μm, or up to 2000 μm. And the dry film thickness of the coating of the conventional anticorrosive paint is only about 100 mu m or 150 mu m. Therefore, the heavy-duty anticorrosive coating can be used under severe conditions and has long-term anticorrosive service life.
At present, the types of heavy-duty anticorrosive coatings mainly include hot galvanizing, hot zinc spraying, cold zinc spraying, organic zinc-rich and inorganic zinc-rich coatings, and the like. However, heavy duty coatings of either type require the consumption of large amounts of zinc. The zinc resource is a non-renewable resource, and if the current global zinc ore reserves are only about 15 years of exploitation according to the worldwide zinc ore exploitation amount of 1300 million tons per year. Although China has the second largest zinc ore resource reserve in the world, the current zinc ore resource reserve can only be used for 7 years of static exploitation according to the annual output of the last zinc ore of 583.26 ten thousand tons. Therefore, zinc reduction is an urgent issue, and the development of heavy anticorrosive coatings with low zinc is also a trend.
The existing heavy-duty anticorrosive coatings are exemplified by the following:
(1) CN 111621177A discloses a preparation method of a low VOC cold spray zinc coating. The paint consists of epoxy resin, a binder, an active diluent, a rheological additive, zinc powder, an environment-friendly solvent, a curing agent and the like. The coating has high volume solid content, low VOC and strong adhesive force;
(2) CN 108948898A discloses a low-surface cold zinc-spraying coating and a preparation method thereof, wherein the coating is composed of graphene oxide dispersion liquid, acrylic resin, a silane coupling agent, a plasticizer, an anti-settling agent, spherical zinc powder, flaky zinc powder and mixed alcohol silica sol. The coating solves the problems of unfavorable construction and environmental harm caused by high requirements of cold zinc spraying coating on surface treatment of base materials, low solid content and the like.
The two existing heavy-duty anticorrosive coatings have the following defects: the products 1 and 2 have the defects of high zinc powder content (the mass percentage of the total zinc is more than 95 percent), poor storage stability and easy zinc fever of workers; in addition, the product 2 also has the defects that the graphene is not easy to disperse, and the graphene is easy to agglomerate after being dispersed, and has poor stability.
However, the zinc reduction alone brings various problems to the heavy-duty anticorrosive paint, such as poor neutral salt spray resistance and poor adhesion of a cold-spray zinc coating in the heavy-duty anticorrosive paint under the condition of low zinc powder content (50-60% of total zinc content).
Therefore, it is a great need to provide a single-component graphene zinc powder coating with low zinc content, neutral salt spray resistance and good adhesion, which can replace cold spray zinc coating, and a preparation method thereof.
Disclosure of Invention
In order to overcome the problems of high zinc powder content and unstable graphene dispersion of the existing heavy anti-corrosion coating and the defects of neutral salt spray resistance and poor adhesion of the coating of the heavy anti-corrosion coating such as a cold spray zinc coating caused by zinc reduction, the invention provides the single-component graphene zinc powder coating and the preparation method thereof.
The technical scheme of the invention is as follows:
the single-component graphene zinc powder coating is mainly prepared from the following components in parts by weight:
wherein the solvent is prepared from dimethylbenzene, n-butanol and methyl isobutyl ketone or cyclohexanone according to the mass ratio of 5-7:3: 1.
The graphene is preferably redox graphene or mechanically stripped graphene, and the number of layers is less than or equal to 10;
the epoxy resin is preferably a bisphenol A type epoxy resin having a molecular weight of 2500-5500.
The single-component graphene zinc powder coating solves the problem of dispersion stability of graphene and also solves the defects of poor neutral salt spray resistance and poor adhesive force of a cold spray zinc coating under the condition of low zinc powder content (the total zinc content (mass percentage) is about 50-60%) by introducing the graphene and the dispersing agent and through the synergistic effect of the graphene, the dispersing agent and other preferable components in the system and the dosage proportion thereof. The single-component graphene zinc powder coating still has excellent corrosion resistance and bonding strength under the condition of low zinc powder content (30% of zinc powder in a dry film), the neutral salt spray resistance in the corrosion resistance can reach about 4000 hours at most, and the adhesive force can reach about 10MPa at most. Its anticorrosion nature is comparable to that of cold sprayed zinc, and its adhesion is far superior to that of cold sprayed zinc.
In addition, a dispersion system formed by the components can form an excellent shielding and conductive network in a paint film when the addition amount of graphene is very low, so that the addition amount of graphene in the single-component graphene zinc powder paint can be reduced to 0.14-0.43 (the existing cold spray zinc does not contain graphene, and the graphene content in the existing heavy anti-corrosion paint adopting graphene is about 1-2%). Due to the fact that the addition amount of the graphene is small, the cost of the product can be effectively reduced, and the cost of raw materials can be reduced by about 20% under the condition that the performances are the same. Under the condition of the same cost, the neutral salt fog resistance can be improved by more than 2 times, and the adhesive force can be improved by more than 3 times. The mechanism is as follows: the large-sheet-diameter graphene can form a conductive network in a coating film of the coating under a very low addition amount, so that excellent anticorrosion performance is realized. However, the dispersibility of the graphene with large sheet diameter in the epoxy resin is poor, a uniformly dispersed system is difficult to form, the system is unstable, and the graphene is easy to deposit and agglomerate and cannot be stored for a long time. And the large-sheet-diameter graphene is easy to increase the viscosity of the system, and is not beneficial to the smooth operation of the stirring process. According to the method, the epoxy resin and the graphene are used, interface balance is broken through stirring, the sheet layer of the graphene microchip is opened, and the graphene is connected with the epoxy resin through the dispersing agent. The epoxy groups of the epoxy resin are partially opened, so that a stable compound can be formed with a small amount of groups on the surface of the graphene microchip, and finally a system in which the graphene microchip and the epoxy resin are uniformly dispersed is formed. Because the graphene nanoplatelets are uniformly dispersed in the epoxy resin, a three-dimensional shielding network and a good electrified network can be formed, so that the coating has good corrosion resistance and bonding strength under the condition of low zinc content.
The number of layers of the graphene is preferably 4 to 6.
The molecular weight of the epoxy resin is preferably 3000-.
The dispersant is preferably a hyperdispersant. A dispersant of type Solsperse 32500 from Lubrizol is preferably used.
The filler can be one or any mixture of more than two of feldspar powder, micaceous iron oxide or talcum powder.
The preparation method of the single-component graphene zinc powder coating mainly comprises the following steps of:
(1) starting the stirrer, adjusting the stirring speed to 200-300r/min, adding a solvent accounting for 90-93.03 percent of the weight of the stirrer, sequentially adding epoxy resin and a dispersant into the stirrer, stirring the mixture until the mixture is uniformly mixed,
(2) keeping the stirring speed of 200-300r/min, sequentially adding the graphene and the anti-settling agent into the mixture obtained in the step (1), uniformly stirring,
(3) zinc powder and filler are added in turn under the stirring of the rotating speed of 400-1200 r/min, and then the mixture is dispersed to the fineness of less than or equal to 50 mu m under the stirring of the rotating speed of 1000-1200 r/min;
(4) and (4) adding the residual solvent into the mixture obtained in the step (3), adjusting the viscosity of the mixture to be 100-110Ku, and filtering to remove impurities to obtain the single-component graphene zinc powder coating.
The preparation method of the single-component graphene zinc powder coating is simple in process and convenient to operate.
Compared with the prior art, the method has the following advantages:
1) the single-component graphene zinc powder coating solves the problem of dispersion stability of graphene and also solves the defects of poor neutral salt spray resistance and poor adhesive force of a cold spray zinc coating under the condition of low zinc powder content (the total zinc content is about 50-60%) by virtue of the synergistic effect of graphene, a super dispersant, other preferable components in a system and the dosage proportion of the components; the single-component graphene zinc powder coating still has excellent corrosion resistance and bonding strength under the condition of low zinc powder content (30 percent of zinc powder in a dry film), the neutral salt spray resistance in the corrosion resistance can reach about 4000 hours at most, and the adhesive force can reach about 10MPa at most; the corrosion resistance of the alloy can be compared with that of cold-sprayed zinc, and the drawing adhesion is far better than that of the cold-sprayed zinc;
2) the preparation method of the single-component graphene zinc powder coating is simple in process and convenient to operate.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the embodiments of the specification.
Example 1
The invention relates to a single-component graphene zinc powder coating which is mainly prepared from the following components in parts by weight:
wherein the solvent is prepared from dimethylbenzene, n-butanol and methyl isobutyl ketone or cyclohexanone according to the mass ratio of 6:3: 1;
the graphene is redox graphene or mechanically stripped graphene, and the number of layers is less than or equal to 10;
the epoxy resin is bisphenol A epoxy resin with the molecular weight of 2500-5500.
The preparation method of the single-component graphene zinc powder coating mainly comprises the following steps of:
(1) starting the stirrer, adjusting the stirring speed to 200r/min, adding a solvent accounting for 90 percent of the weight of the stirrer, sequentially adding epoxy resin and a dispersant, stirring until the mixture is uniformly mixed,
(2) keeping the stirring speed of 200r/min, sequentially adding the graphene and the anti-settling agent into the mixture obtained in the step (1), stirring uniformly,
(3) zinc powder and filler are added in turn under the stirring of the rotating speed of 400r/min, and then the mixture is dispersed under the stirring of the rotating speed of 1000r/min until the fineness is less than or equal to 50 mu m;
(4) and (4) adding the residual solvent into the mixture obtained in the step (3), adjusting the viscosity of the mixture to be 100, and filtering to remove impurities to obtain the single-component graphene zinc powder coating.
Example 2
The invention relates to a single-component graphene zinc powder coating which is mainly prepared from the following components in parts by weight:
wherein the solvent is prepared from dimethylbenzene, n-butanol and methyl isobutyl ketone or cyclohexanone according to the mass ratio of 5:3: 1;
the graphene is redox graphene or mechanically stripped graphene, and the number of layers is 4-6;
the epoxy resin is bisphenol A type epoxy resin with the molecular weight of 3000-5000.
The preparation method of the single-component graphene zinc powder coating mainly comprises the following steps of:
(1) starting the stirrer, adjusting the stirring speed to 300r/min, adding a solvent accounting for 93.03 percent of the weight of the stirrer, sequentially adding epoxy resin and a dispersant, stirring until the mixture is uniformly mixed,
(2) keeping the stirring speed at 300r/min, sequentially adding the graphene and the anti-settling agent into the mixture obtained in the step (1), stirring uniformly,
(3) zinc powder and filler are added in turn under the stirring of 500r/min, and then the mixture is dispersed under the stirring of 1200r/min until the fineness is less than or equal to 50 mu m;
(4) and (4) adding the residual solvent into the mixture obtained in the step (3), adjusting the viscosity of the mixture to be 110, and filtering to remove impurities to obtain the single-component graphene zinc powder coating.
Example 3
The invention relates to a single-component graphene zinc powder coating which is mainly prepared from the following components in parts by weight:
wherein the solvent is prepared from dimethylbenzene, n-butanol and methyl isobutyl ketone or cyclohexanone according to the mass ratio of 7:3: 1;
the graphene is redox graphene or mechanically stripped graphene, and the number of layers is 4-6.
The epoxy resin is bisphenol A type epoxy resin with the molecular weight of 3000-5000.
The preparation method of the single-component graphene zinc powder coating mainly comprises the following steps of:
(1) starting the stirrer, adjusting the stirring speed to 250r/min, adding a solvent accounting for 92 percent of the weight of the stirrer, sequentially adding epoxy resin and a dispersant, stirring until the mixture is uniformly mixed,
(2) keeping the stirring speed of 250r/min, sequentially adding the graphene and the anti-settling agent into the mixture obtained in the step (1), stirring uniformly,
(3) zinc powder and filler are added in turn under the stirring of the rotating speed of 450r/min, and then the mixture is dispersed under the stirring of the rotating speed of 1100r/min until the fineness is less than or equal to 50 mu m;
(4) and (4) adding the residual solvent into the mixture obtained in the step (3), adjusting the viscosity of the mixture to 105, and filtering to remove impurities to obtain the single-component graphene zinc powder coating.
Experimental data:
comparison sample: cold-coating zinc paint
As can be seen from the table above, the single-component graphene zinc powder coating has a low zinc content of about 50-60%, and the flexibility, adhesion and salt spray resistance of the paint film are superior to those of cold spray zinc coatings.
The single-component graphene zinc powder coating and the preparation method thereof are not limited to the above embodiments, and any modification or replacement according to the principles of the present invention should be within the protection scope of the present invention.
Claims (7)
1. A single-component graphene zinc powder coating is characterized in that: the adhesive is mainly prepared from the following components in parts by weight:
wherein the solvent is prepared from dimethylbenzene, n-butanol and methyl isobutyl ketone or cyclohexanone according to the mass ratio of 5-7:3: 1.
2. The monocomponent graphene zinc powder coating of claim 1, wherein: the graphene is redox graphene or mechanically stripped graphene, and the number of layers is less than or equal to 10; the epoxy resin is bisphenol A epoxy resin with the molecular weight of 2500-5500.
3. The monocomponent graphene zinc powder coating of claim 2, wherein: the molecular weight of the epoxy resin is 3000-5000.
4. The monocomponent graphene zinc powder coating of claim 2, wherein: the number of layers of the graphene is 4-6.
5. The monocomponent graphene zinc powder coating of claim 1, wherein: the dispersant is a super dispersant.
6. The monocomponent graphene zinc powder coating of claim 1, wherein: the filler is one or a mixture of more than two of feldspar powder, micaceous iron oxide or talcum powder.
7. The method of preparing a monocomponent graphene zinc powder coating of any one of claims 1-6, wherein the method comprises the following steps: mainly comprises the following steps which are carried out in sequence:
(1) starting the stirrer, adjusting the stirring speed to 200-300r/min, adding a solvent accounting for 90-93.03 percent of the weight of the stirrer, sequentially adding epoxy resin and a dispersant into the stirrer, stirring the mixture until the mixture is uniformly mixed,
(2) keeping the stirring speed of 200-300r/min, sequentially adding the graphene and the anti-settling agent into the mixture obtained in the step (1), uniformly stirring,
(3) zinc powder and filler are added in turn under the stirring of the rotating speed of 400-1200 r/min, and then the mixture is dispersed to the fineness of less than or equal to 50 mu m under the stirring of the rotating speed of 1000-1200 r/min;
(4) and (4) adding the residual solvent into the mixture obtained in the step (3), adjusting the viscosity of the mixture to be 100-110Ku, and filtering to remove impurities to obtain the single-component graphene zinc powder coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011582266.3A CN112694813A (en) | 2020-12-28 | 2020-12-28 | Single-component graphene zinc powder coating and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011582266.3A CN112694813A (en) | 2020-12-28 | 2020-12-28 | Single-component graphene zinc powder coating and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112694813A true CN112694813A (en) | 2021-04-23 |
Family
ID=75512985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011582266.3A Pending CN112694813A (en) | 2020-12-28 | 2020-12-28 | Single-component graphene zinc powder coating and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112694813A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113956745A (en) * | 2021-11-01 | 2022-01-21 | 上海化学工业区公共管廊有限公司 | Weather-proof salt-mist corrosion-resistant coating with low VOC content, and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180274103A1 (en) * | 2017-03-22 | 2018-09-27 | Hamilton Sundstrand Corporation | Corrosion protection via nanomaterials |
| CN110218505A (en) * | 2019-06-27 | 2019-09-10 | 江苏道蓬科技有限公司 | One-component graphene anticorrosive paint and preparation method thereof |
-
2020
- 2020-12-28 CN CN202011582266.3A patent/CN112694813A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180274103A1 (en) * | 2017-03-22 | 2018-09-27 | Hamilton Sundstrand Corporation | Corrosion protection via nanomaterials |
| CN110218505A (en) * | 2019-06-27 | 2019-09-10 | 江苏道蓬科技有限公司 | One-component graphene anticorrosive paint and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 郑水林等: "《粉体表面改性》", 30 September 2011, 中国建材工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113956745A (en) * | 2021-11-01 | 2022-01-21 | 上海化学工业区公共管廊有限公司 | Weather-proof salt-mist corrosion-resistant coating with low VOC content, and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102146225B (en) | Waterborne room-temperature self-curing inorganic zinc enriched coating | |
| CN102352168B (en) | Anticorrosive wear-resistant paint for magnesium alloy and preparation method thereof | |
| CN105623473A (en) | Zinc-containing graphene anti-corrosive primer based on graphene dispersoid | |
| CN101314695B (en) | Environment-friendly epoxy glass squama antiseptic paint for steel construction protection | |
| CN102627903B (en) | Environment-friendly water-based static electricity conductive corrosion-resistant coating and preparation method thereof | |
| CN103497636A (en) | Waterborne epoxy zinc-rich paint modified by nanometer conductive carbon material and preparation method thereof | |
| CN101613559A (en) | Hydrophilic nano zinc based composite coating | |
| CN108948964A (en) | Single-walled carbon nanotube reinforced epoxy zinc rich primer and preparation method thereof | |
| CN102382552A (en) | Low temperature cured solvent-free epoxy anticorrosion paint and its preparation method | |
| CN104371541A (en) | High-temperature primer for metro wheels and preparation method of high-temperature primer | |
| CN108753107B (en) | Strong acid and alkali resistant composite ceramic anticorrosive paint and preparation method thereof | |
| CN114410221B (en) | Preparation method of low-temperature curing environment-friendly water-based chromium-free zinc-aluminum coating | |
| CN105713480A (en) | Epoxy zinc-rich primer and manufacturing method thereof | |
| CN107099219A (en) | A kind of polyaniline-modified epoxy zinc powder composite coating and preparation method | |
| CN108690465A (en) | A kind of high-performance water-based heavy-duty antiseptic paint and preparation method thereof | |
| CN109880484A (en) | A kind of water-base epoxy thickness slurry anti-decaying paint and its preparation method and application | |
| CN108329793B (en) | Graphene modified anti-rust pigment anti-corrosion primer and preparation method thereof | |
| CN104449391A (en) | Iron red anticorrosive paint and preparation method thereof | |
| CN112694813A (en) | Single-component graphene zinc powder coating and preparation method thereof | |
| CN102382555A (en) | Solvent-free low-temperature solidified phenolic epoxy anticorrosive paint and preparation method thereof | |
| CN110746859A (en) | Water-based epoxy zinc-rich coating and preparation method thereof | |
| CN110628297A (en) | Solvent type epoxy coating with high solid content and salt fog resistance and preparation method thereof | |
| CN103214917B (en) | Marine corrosion-resistant epoxy aluminum-magnesium-nickel rear earth rich nanometer material and preparation method thereof | |
| CN109321126B (en) | Solvent-free heavy-duty anticorrosive paint and preparation method thereof | |
| CN108219622A (en) | It is a kind of based on the aluminium alloy of graphene low-density anticorrosive paint and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210423 |