CN112403409A - Self-detection capsule for water-based anticorrosive paint and preparation method thereof - Google Patents
Self-detection capsule for water-based anticorrosive paint and preparation method thereof Download PDFInfo
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- CN112403409A CN112403409A CN202011067467.XA CN202011067467A CN112403409A CN 112403409 A CN112403409 A CN 112403409A CN 202011067467 A CN202011067467 A CN 202011067467A CN 112403409 A CN112403409 A CN 112403409A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
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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
- 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
- C09D7/63—Additives non-macromolecular organic
-
- 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
- C09D7/65—Additives macromolecular
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to a self-detection capsule for a water-based anticorrosive coating, which comprises a capsule wall and a capsule core, wherein the capsule core comprises a water-based coating repairing agent and is characterized in that the capsule core also comprises a color developing agent. The color developing agent is capable of reacting with metal ions and performing color development reaction, and is selected from one or more of hydroxyquinoline, 1, 10-phenanthroline and thymol blue. Through add the colour-developing agent as the capsule core in current selfreparing capsule, when the capsule is torn because of the crazing line that local area appears in the dope layer, can release colour-developing agent wherein, at the initial stage that the corrosion reaction in crazing line region takes place, can observe the colour change through the naked eye, play self-checking and early warning effect, make the crazing line region discover and fix a position easily simultaneously, point out the position for the restoration of dope layer.
Description
Technical Field
The invention relates to the field of water-based anticorrosive coatings, in particular to a self-detection capsule for a water-based anticorrosive coating and a preparation method thereof.
Background
In order to avoid or slow down the corrosion and damage of oxygen and moisture in the environment to the metal material, the common method is to apply water-based anticorrosive paint on the surface of the metal material. However, the anticorrosive coating cannot absolutely guarantee the corrosion resistance of the metal material, and the anticorrosive coating is also damaged by impact, scratch and the like of the external environment in the using process, so that microcracks or openings are formed in the coating layer, and the local area of the coating layer loses the protection effect on the metal material.
In order to solve the problem of influence on the protection of metal materials caused by the damage of a coating layer, self-repairing water-based coatings are researched, self-repairing capsules or self-repairing fibers are added into the water-based coatings, when the coating layer is damaged, local stress concentration can be generated in the damaged area, the self-repairing capsules or self-repairing fibers are torn, a repairing agent in the self-repairing capsules or self-repairing fibers is released, and therefore the coating layer is repaired.
The common self-repairing capsules or self-repairing fibers are mostly disposable, the repairing function of the capsules or the self-repairing fibers is irreversible, and multiple repairing or circulating repairing can not be realized. In addition, a repairing agent capable of performing repeated repair for many times has been studied. However, in the process of repeatedly repairing the coating layer by the self-repairing capsule or the self-repairing fiber for many times, the judgment of the area or the part to be repaired is difficult. On one hand, fine cracks in the coating layer are difficult to be found, and when the fine cracks are found, the metal materials usually have relatively serious corrosion; on the other hand, larger openings or cracks in the paint layer are easily found, but the corrosion of these areas is also very fast. It is therefore desirable to repair the paint layer immediately when it has just developed microcracks.
Therefore, the inventor of the invention develops a self-detection capsule for the water-based anticorrosive paint and a preparation method thereof.
Disclosure of Invention
Aiming at the technical problem that microcracks in the existing self-repairing coating are not easy to discover, the invention provides a self-detection capsule for a water-based anticorrosive coating. When the local area in the coating layer has micro-cracks, the capsule wall is torn by local concentrated stress, the repairing agent and the color developing agent in the capsule wall are released, and when the metal material is corroded at first, the generated metal ions can show easily observed color or color change when meeting the color developing agent, so that the micro-crack area is easily found and positioned, and the position is indicated for repairing the coating layer.
Therefore, the self-detection capsule for the water-based anticorrosive paint comprises a capsule wall and a capsule core, wherein the capsule core comprises the water-based paint repairing agent, and the self-detection capsule is characterized in that the capsule core further comprises a color developing agent.
Further, the color-developing agent used in the present invention is a color-developing agent capable of reacting with a metal ion to cause a color-developing reaction, and, for example,
the color developing agent can be one or more of hydroxyquinoline, 1,10 phenanthroline and thymol blue. In order to facilitate the preparation of the self-detection capsule, the color developing agent is loaded on the surface of the nano-carrier, the nano-carrier selected by the invention is graphene, and other suitable nano-carriers can be selected.
In the self-detecting capsule of the present invention, the aqueous coating repair agent used in the capsule core may be a single repair agent having only a single repair function, or may be a multiple repair agent having multiple repair functions and capable of achieving repeated repair of the coating layer, and preferably is a multiple repair agent having multiple repair functions and capable of achieving repeated repair of the coating layer.
Wherein, the single-time repairing agent can be selected from liquid epoxy resin, polyhydroxy or polyamino compounds which respectively react with isocyanate to generate isocyanate derivatives and the like.
Wherein, the multiple repairing agent can be selected from diamine addition crosslinking agent in CN 104045810A.
Further, the capsule core may also include a catalyst to accelerate the repair of the coating layer.
In the self-detection capsule, the basic function is to repair the coating layer, and the color developing agent is used for finding the area to be repaired and positioning the repaired area. Therefore, in the capsule core, the mass percent of the color developing agent is 1-10%, and the mass percent of the water-based paint repairing agent is 90-99%.
Further, the capsule wall is polyurethane, specifically, polyhydroxy or polyamino compounds are respectively reacted with isocyanate to generate isocyanate derivatives, and then the isocyanate derivatives are reacted with polyol to generate polyurethane to coat the capsule wall outside the capsule core.
In addition, the invention also provides a preparation method of the self-detection capsule for the water-based anticorrosive paint, which comprises the following steps:
(1) and (3) loading a color developing agent, preparing graphene aqueous dispersion with a certain concentration, adding the color developing agent into the graphene aqueous dispersion in a certain proportion, ultrasonically dispersing, filtering and airing to obtain the color developing agent taking graphene as a carrier.
(2) And (2) uniformly dispersing and mixing the color developing agent taking the graphene prepared in the step (1) as a carrier and the water-based paint repairing agent in a solvent to form a core material, forming polyurethane on the surface of the core material, specifically, reacting polyhydroxy or polyamino compounds with isocyanate respectively to generate isocyanate derivatives, and then reacting with polyol to generate polyurethane to obtain the self-detection capsule.
The mass ratio of the color developing agent to the graphene is (1-2): (2-1).
Compared with the existing self-repairing capsules for the water-based anticorrosive paint, the self-detecting capsules for the water-based paint have the following beneficial effects:
(1) according to the invention, the color developing agent is added into the existing self-repairing capsule to serve as the capsule core, when the capsule is torn due to the microcracks appearing in the local area of the coating layer, the color developing agent is released, the color change can be observed by naked eyes at the initial stage of the corrosion reaction of the microcrack area, the self-detection and early-warning effects are achieved, meanwhile, the microcrack area is easy to find and position, and the position is indicated for repairing the coating layer.
(2) In the self-detection capsule, the used water-based paint repairing agent can be a single repairing agent or a multiple repairing agent. Particularly, for a multi-time repairing agent, the multi-time repairing can be realized only by additionally heating, so that the self-detection capsule disclosed by the invention has a particularly remarkable effect, and can help repairing workers to accurately judge an area to be repaired and heat the area.
Detailed Description
The following examples are only some embodiments for describing the contents of the present invention in detail, and are not all contents of the present invention.
Example 1
A self-detection capsule for a water-based anticorrosive coating comprises a capsule wall and a capsule core, wherein the capsule core comprises a water-based coating repairing agent, the capsule core also comprises a color developing agent, the color developing agent is hydroxyquinoline, and the color developing agent is loaded on the surface of graphene. In the capsule core, the mass percent of the color developing agent is 5 percent, and the mass percent of the water-based paint repairing agent is 95 percent.
The water-based paint repairing agent has a repeated repairing function and can realize repeated repairing of a paint layer, and is a diamine adduct crosslinking agent selected from CN 104045810A.
The preparation method of the self-detection capsule for the water-based anticorrosive paint comprises the following steps:
(1) loading a color developing agent, preparing graphene aqueous dispersion with a certain concentration, adding the color developing agent into the graphene aqueous dispersion in a certain proportion, ultrasonically dispersing, filtering and airing to obtain the color developing agent taking graphene as a carrier; the mass ratio of the color developing agent to the graphene is 1: 1.
(2) and (2) uniformly dispersing and mixing the color developing agent taking the graphene prepared in the step (1) as a carrier and a diamine adduct cross-linking agent in CN 104045810A in a solvent to form a core material, forming polyurethane on the surface of the core material, specifically, reacting polyhydroxy or polyamino compounds with isocyanate respectively to generate isocyanate derivatives, and then reacting with polyol to generate polyurethane to obtain the self-detection capsule.
Example 2
A self-detection capsule for a water-based anticorrosive coating comprises a capsule wall and a capsule core, wherein the capsule core comprises a water-based coating repairing agent, the capsule core also comprises a color developing agent, the color developing agent is 1,10 phenanthroline, and the color developing agent is loaded on the surface of graphene. In the capsule core, the mass percent of the color developing agent is 1 percent, and the mass percent of the water-based paint repairing agent is 99 percent.
The water paint repairing agent is a single repairing agent with a single repairing function, and is isocyanate derivatives generated by the reaction of polyhydroxy or polyamino compounds and isocyanate respectively.
The preparation method of the self-detection capsule for the water-based anticorrosive paint comprises the following steps:
(1) loading a color developing agent, preparing graphene aqueous dispersion with a certain concentration, adding the color developing agent into the graphene aqueous dispersion in a certain proportion, ultrasonically dispersing, filtering and airing to obtain the color developing agent taking graphene as a carrier; the mass ratio of the color developing agent to the graphene is 1: 2.
(2) and (2) taking the graphene prepared in the step (1) as a color developing agent of a carrier, reacting the color developing agent with a polyhydroxy or polyamino compound with isocyanate respectively to generate an isocyanate derivative, dispersing and mixing the isocyanate derivative in a solvent to form a core material, forming polyurethane on the surface of the core material, specifically, reacting the polyhydroxy or polyamino compound with isocyanate respectively to generate the isocyanate derivative, and then reacting with polyol to generate the polyurethane to obtain the self-detection capsule.
Example 3
A self-detection capsule for a water-based anticorrosive paint comprises a capsule wall and a capsule core, wherein the capsule core comprises a water-based paint repairing agent, the capsule core also comprises a color developing agent, the color developing agent is thymol blue, and the color developing agent is loaded on the surface of graphene. In the capsule core, the mass percent of the color developing agent is 10 percent, and the mass percent of the water-based paint repairing agent is 90 percent.
The water-based paint repairing agent is a single repairing agent with a single repairing function and is liquid epoxy resin.
The preparation method of the self-detection capsule for the water-based anticorrosive paint comprises the following steps:
(1) loading a color developing agent, preparing graphene aqueous dispersion with a certain concentration, adding the color developing agent into the graphene aqueous dispersion in a certain proportion, ultrasonically dispersing, filtering and airing to obtain the color developing agent taking graphene as a carrier; the mass ratio of the color developing agent to the graphene is 2: 1.
(2) dispersing and uniformly mixing the color developing agent taking the graphene prepared in the step (1) as a carrier and liquid epoxy resin in a solvent to form a core material, and then forming polyurethane on the surface of the core material, specifically, reacting polyhydroxy or polyamino compounds with isocyanate respectively to generate isocyanate derivatives, and then reacting with polyol to generate polyurethane to obtain the self-detection capsule.
Claims (10)
1. A self-detection capsule for a water-based anticorrosive paint comprises a capsule wall and a capsule core, wherein the capsule core comprises a water-based paint repairing agent, and is characterized in that the capsule core further comprises a color developing agent.
2. The self-detecting capsule for the water-based anticorrosive paint according to claim 1, wherein: the color developing agent is capable of reacting with metal ions and performing color development reaction, and is selected from one or more of hydroxyquinoline, 1, 10-phenanthroline and thymol blue.
3. The self-detecting capsule for the water-based anticorrosive paint according to claim 2, wherein: the color developing agent is loaded on the surface of a nano-carrier, and the nano-carrier is graphene.
4. The self-detecting capsule for the water-based anticorrosive paint according to claim 1, wherein: in the self-detection capsule, the water-based paint repairing agent used in the capsule core is a single repairing agent with a single repairing function or a multi-time repairing agent with a multi-time repairing function and capable of realizing repeated repairing of a paint layer.
5. The self-detecting capsule for the water-based anticorrosive paint according to claim 4, wherein: the single repairing agent can be selected from liquid epoxy resin, polyhydroxy or polyamino compounds which respectively react with isocyanate to generate isocyanate derivatives, and the multiple repairing agent is a diamine addition product crosslinking agent.
6. The self-detecting capsule for the water-based anticorrosive paint according to claim 1, wherein: the capsule core may also include a catalyst.
7. The self-detecting capsule for the water-based anticorrosive paint according to claim 1, wherein: in the capsule core, the mass percent of the color developing agent is 1-10%, and the mass percent of the water-based paint repairing agent is 90-99%.
8. The self-detecting capsule for the water-based anticorrosive paint according to claim 1, wherein: the capsule wall is polyurethane, and specifically, polyhydroxy or polyamino compounds react with isocyanate respectively to generate isocyanate derivatives, then the isocyanate derivatives react with polyol to generate polyurethane, and the polyurethane is coated outside the capsule core.
9. The method for preparing the self-detecting capsule for the water-based anticorrosive paint according to any one of claims 1 to 8, comprising the steps of:
(1) loading a color developing agent, preparing graphene aqueous dispersion with a certain concentration, adding the color developing agent into the graphene aqueous dispersion in a certain proportion, ultrasonically dispersing, filtering and airing to obtain the color developing agent taking graphene as a carrier;
(2) and (2) uniformly dispersing and mixing the color developing agent taking the graphene prepared in the step (1) as a carrier and the water-based paint repairing agent in a solvent to form a core material, forming polyurethane on the surface of the core material, specifically, reacting polyhydroxy or polyamino compounds with isocyanate respectively to generate isocyanate derivatives, and then reacting with polyol to generate polyurethane to obtain the self-detection capsule.
10. The method of claim 9, wherein: the mass ratio of the color developing agent to the graphene is (1-2): (2-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011067467.XA CN112403409A (en) | 2020-10-06 | 2020-10-06 | Self-detection capsule for water-based anticorrosive paint and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011067467.XA CN112403409A (en) | 2020-10-06 | 2020-10-06 | Self-detection capsule for water-based anticorrosive paint and preparation method thereof |
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| CN112403409A true CN112403409A (en) | 2021-02-26 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102702838A (en) * | 2012-06-28 | 2012-10-03 | 中国船舶重工集团公司第七二五研究所 | Micro-crack self-repairing microcapsule and preparation method thereof |
| CN104045810A (en) * | 2014-06-18 | 2014-09-17 | 中国科学院化学研究所 | Diamine addition crosslinking agent and preparation method thereof, as well as composition for preparing thermal reversible crosslinking epoxy resin and composite material of thermal reversible crosslinking epoxy resin |
| CN108485495A (en) * | 2016-07-19 | 2018-09-04 | 上海理工大学 | A method of preparing the self-test anticorrosive paint containing nano-carrier |
| US20190144705A1 (en) * | 2015-12-04 | 2019-05-16 | The Board Of Trustees Of The University Of Illinois | Autonomic damage indication in coatings |
| CN110052230A (en) * | 2019-04-29 | 2019-07-26 | 东北石油大学 | A kind of self-repairing microcapsule and its preparation method and application |
| CN111087845A (en) * | 2019-12-26 | 2020-05-01 | 湖南航天三丰科工有限公司 | Self-repairing microcapsule and preparation method thereof, and self-repairing coating and preparation method thereof |
-
2020
- 2020-10-06 CN CN202011067467.XA patent/CN112403409A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102702838A (en) * | 2012-06-28 | 2012-10-03 | 中国船舶重工集团公司第七二五研究所 | Micro-crack self-repairing microcapsule and preparation method thereof |
| CN104045810A (en) * | 2014-06-18 | 2014-09-17 | 中国科学院化学研究所 | Diamine addition crosslinking agent and preparation method thereof, as well as composition for preparing thermal reversible crosslinking epoxy resin and composite material of thermal reversible crosslinking epoxy resin |
| US20190144705A1 (en) * | 2015-12-04 | 2019-05-16 | The Board Of Trustees Of The University Of Illinois | Autonomic damage indication in coatings |
| CN108485495A (en) * | 2016-07-19 | 2018-09-04 | 上海理工大学 | A method of preparing the self-test anticorrosive paint containing nano-carrier |
| CN110052230A (en) * | 2019-04-29 | 2019-07-26 | 东北石油大学 | A kind of self-repairing microcapsule and its preparation method and application |
| CN111087845A (en) * | 2019-12-26 | 2020-05-01 | 湖南航天三丰科工有限公司 | Self-repairing microcapsule and preparation method thereof, and self-repairing coating and preparation method thereof |
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Application publication date: 20210226 |