CN111471337A - Composition, preparation method and application in field of anticorrosive coating - Google Patents
Composition, preparation method and application in field of anticorrosive coating Download PDFInfo
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- CN111471337A CN111471337A CN201911307993.6A CN201911307993A CN111471337A CN 111471337 A CN111471337 A CN 111471337A CN 201911307993 A CN201911307993 A CN 201911307993A CN 111471337 A CN111471337 A CN 111471337A
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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
- 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
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
Abstract
The invention belongs to the technical field of research and development of graphene anticorrosive materials, and particularly relates to a composition, a preparation method and application in the field of anticorrosive coatings. The invention provides a composition, a preparation method of the composition and application of the composition or a product obtained by the preparation method in the field of UV-moisture dual-curing anticorrosive coatings. In the invention, the isocyanate-containing polyurethane acrylate UV resin is a dual-curing resin of moisture curing/UV curing, the prepared product can realize moisture curing or UV curing, and various curing modes can realize the curing and thick coating requirements of the special-shaped object; through detection, compared with a commercially available reference product, the hardness, the adhesive force, the scratch resistance, the corrosion resistance and the like of the prepared product are improved; the technical defects that in the prior art, the UV curing coating for metal corrosion prevention is poor in adhesive force, poor in flexibility, narrow in application range and incapable of meeting the use requirement in corrosion prevention capacity are overcome.
Description
Technical Field
The invention belongs to the technical field of research and development of graphene anticorrosive materials, and particularly relates to a composition, a preparation method and application in the field of anticorrosive coatings.
Background
In the market at present, less UV curing coating is used in the aspect of metal corrosion resistance, but the UV curing coating has been widely applied in the partial fields of light corrosion resistance and heavy decoration, such as metal label decoration pop can processing, metal decoration plate manufacturing, aluminum alloy door and window protection, steel pipe temporary coating protection and the like. The method has the advantages of higher production efficiency, lower energy consumption and fast curing speed, and can be operated in a room temperature environment to reduce VOC emission; due to the characteristics of environmental protection, high energy consumption curing speed and the like, the coating is applied to the field of metal corrosion prevention, has great practical significance, and can greatly improve the production efficiency of corrosion-resistant products, reduce the cost and improve the pollution to the environment.
In the prior art, the UV curing coating has several problems in the metal anticorrosion application, firstly, the adhesive force and the flexibility are poor, and the actual use requirement cannot be met; secondly, the photocureable coating is only suitable for plane coating with a simple structure, and a paint film cannot be dried in places where the special-shaped piece cannot be exposed; thirdly, the one-time coating is thin, the corrosion resistance time is short, and the coating can only be applied to light corrosion resistance but can not be applied to some heavy corrosion resistance fields with higher requirements.
Therefore, a composition, a preparation method and an application in the field of anticorrosive coatings are developed to solve the technical defects that in the prior art, a UV-curable coating for metal corrosion prevention has poor adhesion, poor flexibility, a narrow application range and an anticorrosive capability which cannot meet the use requirement, and thus the problems to be solved by the technical staff in the field are urgently needed.
Disclosure of Invention
In view of the above, the invention provides a composition, a preparation method and an application in the field of an anticorrosive coating, which are used for solving the technical defects that in the prior art, a UV-cured coating for metal corrosion prevention has poor adhesion, poor flexibility, a narrow application range and an anticorrosive capability which cannot meet the use requirement.
The invention provides a composition, which comprises the following raw materials: the coating comprises isocyanate-containing polyurethane acrylate UV resin, graphene powder, a monofunctional reactive diluent, a defoaming agent, a leveling agent, a photoinitiator and a wetting dispersant.
Preferably, the raw materials of the composition comprise, by mass: 60-80 parts of isocyanate-containing polyurethane acrylate UV resin, 0.25-0.75 part of graphene powder, 9-38 parts of monofunctional reactive diluent, 0.1-1 part of defoaming agent, 0.1-1 part of flatting agent, 3-12 parts of photoinitiator and 0.1-0.75 part of wetting dispersant.
Preferably, the photoinitiator comprises: acyl phosphine oxide photoinitiator, thioxanthone photoinitiator and amine alkyl benzophenone photoinitiator.
Preferably, the photoinitiator comprises the following components in parts by mass: 2-7 parts of acyl phosphine oxide photoinitiator, 0.5-2 parts of thioxanthone photoinitiator and 0.5-3 parts of aminoalkyl benzophenone photoinitiator.
Preferably, the monofunctional reactive diluent is selected from: any one or more of cyclotrimethylolpropane methylal acrylate, isoborneol acrylate and tetrahydrofuran acrylate;
the defoaming agent is selected from: any one or more of an organic silicon defoamer, a polyacrylate defoamer and a modified organic silicon defoamer;
the leveling agent is selected from: any one or more of an organic silicon flatting agent, an acrylate flatting agent and fluorine modified acrylate;
the wetting dispersant is selected from: controllable polymerization acrylic acid block copolymer dispersant, macromolecule polyurethane, acid copolymer and amine salt thereof.
The invention also provides a preparation method of the composition, which comprises the following steps:
mixing a monofunctional active diluent, a wetting dispersant and graphene powder, and then sequentially stirring and homogenizing to obtain graphene slurry;
mixing the isocyanate-containing polyurethane acrylate UV resin with the monofunctional reactive diluent, the defoaming agent and the flatting agent, and stirring for the first time to obtain a first product;
mixing the first product with the graphene slurry, and then sequentially performing primary dispersion and secondary dispersion to obtain a second product, wherein the dispersion rotating speed of the primary dispersion is less than that of the secondary dispersion;
and step four, mixing the second product with a photoinitiator, and then sequentially stirring, standing, defoaming and filtering to obtain the product.
Preferably, in the first step, the stirring method is as follows: stirring for 30-50 min at the rotating speed of 1000-1200 r/min, wherein the homogenizing method comprises the following steps: treating at 1200-1500 bar for 8-10 times.
Preferably, in the second step, the first stirring method is: stirring at a rotating speed of 500-700 r/min for 10-20 min;
in the third step, the first dispersing method comprises the following steps: dispersing for 30-50 min at a rotating speed of 500-800 r/min, wherein the second dispersing method comprises the following steps: dispersing for 30-50 min at a rotation speed of 1000-1200 r/min.
Preferably, in the fourth step, the stirring method is as follows: stirring at a rotating speed of 500-800 r/min for 20-40 min, standing for 60-90 min, and filtering: filtering with 200-mesh filter cloth.
The invention also provides application of the composition or the product prepared by the preparation method in the field of UV-moisture dual-curing anticorrosive coatings.
In summary, the present invention provides a composition, which comprises the following raw materials: the coating comprises isocyanate-containing polyurethane acrylate UV resin, graphene powder, a monofunctional reactive diluent, a defoaming agent, a leveling agent, a photoinitiator and a wetting dispersant. The invention also provides a preparation method of the composition, and application of the composition or a product obtained by the preparation method in the field of UV-moisture dual-curing anticorrosive coatings. According to the technical scheme provided by the invention, the isocyanate-containing polyurethane acrylate UV resin is a moisture curing/UV curing dual-curing resin, the prepared product can realize moisture curing or UV curing, has multiple curing modes, and can meet the requirements on curing and thick coating of a special-shaped object; further, through detection, compared with a commercially available reference product, the product prepared by the technical scheme provided by the invention has the advantages that the hardness, the adhesive force, the scratch resistance, the corrosion resistance and the like are improved. The composition, the preparation method and the application in the field of anticorrosive coatings provided by the invention solve the technical defects that in the prior art, the UV curing coating for metal corrosion prevention has poor adhesion, poor flexibility, narrow application range and incapability of meeting the use requirement of corrosion prevention capability.
Detailed Description
The invention provides a composition, a preparation method and application in the field of anticorrosive coatings, and aims to overcome the technical defects that in the prior art, a UV (ultraviolet) curing coating for metal corrosion prevention is poor in adhesion, poor in flexibility, narrow in application range and incapable of meeting the use requirement of corrosion prevention capability.
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to illustrate the present invention in more detail, a composition, a preparation method and an application in the field of anticorrosive coatings provided by the present invention are specifically described below with reference to examples.
Example 1
This example is a specific example of preparing a metal anticorrosive paint product 1.
Step one, mixing 20Kg of monofunctional active diluent, 0.1Kg of wetting dispersant and 0.6Kg of graphene powder, stirring at the rotating speed of 1000-1200 r/min for 30-50 min, and homogenizing at 1200-1500 bar for 8-10 times to obtain graphene slurry 1; in this example, the monofunctional reactive diluent was cyclotrimethylolpropane formal acrylate, and the wetting dispersant was a controlled polymerization acrylic block copolymer dispersant.
Step two, mixing 75Kg of isocyanate-containing polyurethane acrylate UV resin with 10Kg of monofunctional reactive diluent, 0.1Kg of defoaming agent and 0.7Kg of flatting agent, and stirring at the rotating speed of 500-700 r/min for 10-20 min to obtain a first product 1; in this embodiment, the monofunctional reactive diluent is cyclotrimethylolpropane methylal acrylate, the defoaming agent is an organic silicon defoaming agent, and the leveling agent is an organic silicon leveling agent.
And step three, after mixing the first product 1 and the graphene slurry 1, dispersing for 30-50 min at a rotating speed of 500-800 r/min, and then dispersing for 30-50 min at a rotating speed of 1000-1200 r/min to obtain a second product 1.
And step four, mixing the second product 1 with 7Kg of acylphosphine oxide photoinitiator, 1.8Kg of thioxanthone photoinitiator and 3Kg of aminoalkyl benzophenone photoinitiator, stirring at the rotating speed of 500-800 r/min for 20-40 min, standing for 60-90 min for defoaming, and filtering by using 200-mesh filter cloth to obtain the product 1.
Example 2
This example is a specific example of preparing a metal anticorrosive paint product 2.
Step one, mixing 3Kg of monofunctional active diluent, 0.75Kg of wetting dispersant and 0.75Kg of graphene powder, stirring at the rotating speed of 1000-1200 r/min for 30-50 min, and homogenizing at 1200-1500 bar for 8-10 times to obtain graphene slurry 2; in this embodiment, the monofunctional reactive diluent is isoborneol acrylate, and the wetting dispersant is a polymer polyurethane dispersant.
Step two, mixing 80Kg of isocyanate-containing polyurethane acrylate UV resin with 6Kg of monofunctional reactive diluent, 0.3Kg of defoaming agent and 1Kg of flatting agent, and stirring at the rotating speed of 500-700 r/min for 10-20 min to obtain a first product 2; in this embodiment, the monofunctional reactive diluent is isoborneol acrylate, the defoamer is polyacrylate defoamer, and the leveling agent is acrylate leveling agent.
And step three, after mixing the first product 2 and the graphene slurry 2, dispersing for 30-50 min at the rotating speed of 500-800 r/min, and then dispersing for 30-50 min at the rotating speed of 1000-1200 r/min to obtain a second product 2.
And step four, mixing the second product 2 with 5Kg of acylphosphine oxide photoinitiator, 0.5Kg of thioxanthone photoinitiator and 0.5Kg of amine alkyl benzophenone photoinitiator, stirring at the rotating speed of 500-800 r/min for 20-40 min, standing for 60-90 min for defoaming, and filtering by using 200-mesh filter cloth to obtain the product 2.
Example 3
This example is a specific example of preparing a metal anticorrosive paint product 3.
Step one, mixing 25Kg of monofunctional active diluent, 0.3Kg of wetting dispersant and 0.25Kg of graphene powder, stirring at the rotating speed of 1000-1200 r/min for 30-50 min, and homogenizing at 1200-1500 bar for 8-10 times to obtain graphene slurry 3; in this example, the monofunctional reactive diluent was tetrahydrofuran acrylate, and the wetting dispersant was an acidic copolymer and its amine salt.
Step two, mixing 60Kg of isocyanate-containing polyurethane acrylate UV resin with 13Kg of monofunctional reactive diluent, 1Kg of defoaming agent and 0.1Kg of flatting agent, and stirring at the rotating speed of 500-700 r/min for 10-20 min to obtain a first product 3; in this embodiment, the monofunctional reactive diluent is tetrahydrofuran acrylate, the defoamer is a modified silicone defoamer, and the leveling agent is fluorine modified acrylate.
And step three, after mixing the first product 3 and the graphene slurry 3, dispersing for 30-50 min at the rotating speed of 500-800 r/min, and then dispersing for 30-50 min at the rotating speed of 1000-1200 r/min to obtain a second product 3.
And step four, mixing the second product 3 with 2Kg of acylphosphine oxide photoinitiator, 2Kg of thioxanthone photoinitiator and 2.5Kg of aminoalkyl benzophenone photoinitiator, stirring at the rotating speed of 500-800 r/min for 20-40 min, standing for 60-90 min for defoaming and defoaming, and filtering by using 200-mesh filter cloth to obtain the product 3.
Example 4
This example is a specific example of measuring the corrosion resistance of each metal in the products 1 to 3 obtained in examples 1 to 3. In this example, the control used was a commercially available UV curable metal anticorrosive paint.
Respectively coating the products 1-3 and a reference product on the treated aluminum alloy panel, wherein each product is provided with 2 spraying plates, and one of the spraying plates adopts a curing mode of surface drying for 30min and 24h at room temperature and surface drying for 5min and light curing and solid drying for 10 min. The spraying amount of the product 1-3 is 120g/m2The thickness of the corresponding coating is 80 μm, and if the spraying amount of the reference substance is too large, the reference substance is storedThe coating thickness of the control was 40 μm in the case of ineffective drying.
Referring to JG/T224-.
The experimental results are shown in tables 1 and 2.
TABLE 1 non-photocuring test results
TABLE 2 post-photocuring test results
| Test items | Product 1 | Product 2 | Product 3 | Reference substance |
| Coating thickness (um) | 80 | 78 | 84 | 40 |
| Drying time | 0.8s | 0.8s | 0.8s | Dried bean curd |
| Paint film appearance | Is normal | Is normal | Is normal | Is normal |
| Hardness of | 3H | 3H | 3H | 2H |
| Adhesion force | 0 | 0 | 0 | 1-2 |
| Flexibility (2mm) | No cracking or falling off | No cracking or falling off | No cracking or falling off | Cracking or delaminating |
| Salt spray resistance (h) | 1100 | 1300 | 1050 | 505 |
| Acid resistance | No abnormality | No abnormality | No abnormality | No abnormality |
| Water resistance | No abnormality | No abnormality | No abnormality | No abnormality |
| Alkali resistance | No abnormality | No abnormality | No abnormality | No abnormality |
From tables 1 and 2, it can be seen that, compared with the reference, the specific indexes of the products prepared by the technical scheme provided by the invention are significantly improved in various performances related to the metal anticorrosive paint.
As can be seen from the above embodiments, the technical solution provided by the present invention has the following advantages:
1. because the isocyanate-containing polyurethane acrylate UV resin is added in the raw materials, the coating can be cured by UV and moisture, or the two curing modes are matched with each other, so that the prepared metal anticorrosive coating can be coated with thicker thickness and can also be suitable for anticorrosive coating of various special-shaped structures;
2. through detection, compared with a commercially available product, the product prepared by the technical scheme provided by the invention has the advantages that the hardness, the adhesive force, the scratch resistance and the chemical resistance of a paint film after coating are obviously improved;
3. the graphene nano material is introduced into the formula of the raw materials, so that the corrosion resistance and chemical resistance of the coated paint film can be further improved.
4. Because the coating can be thickly coated at one time, the physicochemical property of the coating is not influenced, and the application range is further expanded.
In summary, the present invention provides a composition, which comprises the following raw materials: the coating comprises isocyanate-containing polyurethane acrylate UV resin, graphene powder, a monofunctional reactive diluent, a defoaming agent, a leveling agent, a photoinitiator and a wetting dispersant. The invention also provides a preparation method of the composition, and application of the composition or a product obtained by the preparation method in the field of UV-moisture dual-curing anticorrosive coatings. According to the technical scheme provided by the invention, the isocyanate-containing polyurethane acrylate UV resin is a moisture curing/UV curing dual-curing resin, the prepared product can realize moisture curing or UV curing, has multiple curing modes, and can meet the requirements on curing and thick coating of a special-shaped object; further, through detection, compared with a commercially available reference product, the product prepared by the technical scheme provided by the invention has the advantages that the hardness, the adhesive force, the scratch resistance, the corrosion resistance and the like are improved. The composition, the preparation method and the application in the field of anticorrosive coatings provided by the invention solve the technical defects that in the prior art, the UV curing coating for metal corrosion prevention has poor adhesion, poor flexibility, narrow application range and incapability of meeting the use requirement of corrosion prevention capability.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A composition characterized in that the raw materials of said composition comprise: the coating comprises isocyanate-containing polyurethane acrylate UV resin, graphene powder, a monofunctional reactive diluent, a defoaming agent, a leveling agent, a photoinitiator and a wetting dispersant.
2. The composition according to claim 1, wherein the composition comprises the following raw materials in parts by mass: 60-80 parts of isocyanate-containing polyurethane acrylate UV resin, 0.25-0.75 part of graphene powder, 9-38 parts of monofunctional reactive diluent, 0.1-1 part of defoaming agent, 0.1-1 part of flatting agent, 3-12 parts of photoinitiator and 0.1-0.75 part of wetting dispersant.
3. The composition of claim 1 or 2, wherein the photoinitiator comprises: acyl phosphine oxide photoinitiator, thioxanthone photoinitiator and amine alkyl benzophenone photoinitiator.
4. The composition of claim 3, wherein the photoinitiator comprises, in parts by mass: 2-7 parts of acyl phosphine oxide photoinitiator, 0.5-2 parts of thioxanthone photoinitiator and 0.5-3 parts of aminoalkyl benzophenone photoinitiator.
5. Composition according to claim 1 or 2, characterized in that the monofunctional reactive diluent is chosen from: any one or more of cyclotrimethylolpropane methylal acrylate, isoborneol acrylate and tetrahydrofuran acrylate;
the defoaming agent is selected from: any one or more of an organic silicon defoamer, a polyacrylate defoamer and a modified organic silicon defoamer;
the leveling agent is selected from: any one or more of an organic silicon flatting agent, an acrylate flatting agent and fluorine modified acrylate;
the wetting dispersant is selected from: controllable polymerization acrylic acid block copolymer dispersant, high molecular polyurethane dispersant, and any one or more of acid copolymer and amine salt thereof.
6. A process for the preparation of a composition comprising any one of claims 1 to 5, wherein the process comprises:
mixing a monofunctional active diluent, a wetting dispersant and graphene powder, and then sequentially stirring and homogenizing to obtain graphene slurry;
mixing the isocyanate-containing polyurethane acrylate UV resin with the monofunctional reactive diluent, the defoaming agent and the flatting agent, and stirring for the first time to obtain a first product;
mixing the first product with the graphene slurry, and then sequentially performing primary dispersion and secondary dispersion to obtain a second product, wherein the dispersion rotating speed of the primary dispersion is less than that of the secondary dispersion;
and step four, mixing the second product with a photoinitiator, and then sequentially stirring, standing, defoaming and filtering to obtain the product.
7. The method according to claim 6, wherein in the first step, the stirring method comprises: stirring for 30-50 min at the rotating speed of 1000-1200 r/min, wherein the homogenizing method comprises the following steps: treating at 1200-1500 bar for 8-10 times.
8. The method according to claim 6, wherein in the second step, the first stirring method comprises: stirring at a rotating speed of 500-700 r/min for 10-20 min;
in the third step, the first dispersing method comprises the following steps: dispersing for 30-50 min at a rotating speed of 500-800 r/min, wherein the second dispersing method comprises the following steps: dispersing for 30-50 min at a rotation speed of 1000-1200 r/min.
9. The method according to claim 6, wherein in step four, the stirring method comprises: stirring at a rotating speed of 500-800 r/min for 20-40 min, standing for 60-90 min, and filtering: filtering with 200-mesh filter cloth.
10. Use of a composition according to any one of claims 1 to 5 or a product obtained by a method according to any one of claims 6 to 9 in the field of UV-moisture dual cure corrosion protective coatings.
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| WO2023193952A1 (en) | 2022-04-04 | 2023-10-12 | H. K. Wentworth Limited | Single component uv curable conformal coating with moisture secondary cure function |
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Application publication date: 20200731 |