CN116102967A - Ultrathin coating anti-corrosion paint and preparation method and application thereof - Google Patents
Ultrathin coating anti-corrosion paint and preparation method and application thereof Download PDFInfo
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- CN116102967A CN116102967A CN202210860237.1A CN202210860237A CN116102967A CN 116102967 A CN116102967 A CN 116102967A CN 202210860237 A CN202210860237 A CN 202210860237A CN 116102967 A CN116102967 A CN 116102967A
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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
- C09D175/08—Polyurethanes from polyethers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7614—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring
- C08G18/7621—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring being toluene diisocyanate including isomer mixtures
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/83—Chemically modified polymers
- C08G18/831—Chemically modified polymers by oxygen-containing compounds inclusive of carbonic acid halogenides, carboxylic acid halogenides and epoxy halides
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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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The application discloses an ultrathin coating anti-corrosion paint, a preparation method and application thereof, and belongs to the technical field of anti-corrosion paint. An ultra-thin coating anti-corrosion paint comprises the following components in parts by weight: 95-108 parts of tetrahydrofuran-homo-polyether polyol, 50-100 parts of 2, 4-toluene diisocyanate, 0.01-0.1 part of dibutyl tin dilaurate, 0.007-0.07 part of benzoyl chloride, 15-45 parts of solvent and 0.001-0.01 part of auxiliary agent. The viscosity of the anticorrosive paint is about 200cps at 25 ℃, bubbles entrained in the coating are easy to be separated, the coating compactness is high, and the coating thickness is not more than 80 mu m, so that an excellent anticorrosive effect can be achieved.
Description
Technical Field
The application relates to an ultrathin coating anti-corrosion paint, a preparation method and application thereof, and belongs to the technical field of anti-corrosion paint.
Background
With the continuous development of world metallurgical technology, most ships currently adopt metal shells, and the metal shells have strong wear resistance and attractive appearance, and more importantly, have strong striking resistance and can resist the impact of sea waves in ocean transportation. However, the metal material is not perfect, and is corroded by seawater temperature, salinity, atmospheric temperature and atmospheric humidity in the marine environment for a long time, so that the corrosion degree is serious, the strength of the steel structure of the ship is reduced, the service life of the ship is shortened, the sailing resistance is increased, the sailing speed is reduced, and the usability is influenced. Even more serious, once perforation or cracking occurs, this can also lead to the occurrence of a loss accident, with a surprising loss. Therefore, it is necessary to apply an anti-corrosive coating to the surface of the metal casing of the ship to prevent seawater erosion.
At present, most of the anticorrosive paint in China needs to reach a certain thickness to ensure the anticorrosive effect, and the general rule is that the anticorrosive effect is in direct proportion to the thickness of the anticorrosive paint, if the thickness of the coating is more than 200 mu m according to the degree of importance of being protected, the performance of the coating is reduced due to the fact that the coating is too thick, such as easy cracking and falling off, low hardness and the like; in addition, most of the anticorrosive coatings on the market have higher viscosity (the viscosity is more than 500cps at 25 ℃), so that bubbles entrained in the coating are not easy to deviate, and finally a pinhole phenomenon is formed, so that the anticorrosive effect is affected.
Disclosure of Invention
In order to solve the problems, the ultra-thin coating anti-corrosion paint, the preparation method and the application thereof are provided, the viscosity of the paint is about 200cps at 25 ℃, bubbles entrained in the coating are easy to be separated, the coating compactness is high, and the coating thickness is not more than 80 mu m, so that the excellent anti-corrosion effect can be achieved.
The technical scheme of the invention is as follows:
an ultra-thin coating anti-corrosion paint comprises the following components in parts by weight: 95-108 parts of tetrahydrofuran-homo-polyether polyol, 50-100 parts of 2, 4-toluene diisocyanate, 0.01-0.1 part of dibutyl tin dilaurate, 0.007-0.07 part of benzoyl chloride, 15-45 parts of solvent and 0.001-0.01 part of auxiliary agent.
Preferably, the anticorrosive paint comprises the following components in parts by weight: 98-102 parts of tetrahydrofuran-homopolyether polyol, 70-90 parts of 2, 4-toluene diisocyanate, 0.03-0.08 part of dibutyl tin dilaurate, 0.02-0.06 part of benzoyl chloride, 20-30 parts of solvent and 0.003-0.008 part of auxiliary agent.
Preferably, the anticorrosive paint comprises the following components in parts by weight: 100 parts of tetrahydrofuran-homo-polyether polyol, 80 parts of 2, 4-toluene diisocyanate, 0.05 part of dibutyl tin dilaurate, 0.04 part of benzoyl chloride, 25 parts of solvent and 0.006 part of auxiliary agent.
Preferably, the molecular weight of the tetrahydrofuran-homopolyether polyol is 1300-3600.
Preferably, the tetrahydrofuran-homo-polyether polyol has a viscosity of 280-320cps at 25℃and a hydroxyl value of 150-190mgKOH/g.
Preferably, the solvent is selected from one or both of toluene and ethyl acetate.
Preferably, the auxiliary agent is an antifoaming agent, and the antifoaming agent is tween 80.
According to another aspect of the present application, there is provided a method for preparing any one of the above ultra-thin coating anti-corrosive paint, comprising the steps of:
(1) Adding a solvent into a reactor, heating to 40-60 ℃, adding tetrahydrofuran-homo-polyether polyol, and uniformly stirring to obtain a mixture A;
(2) Heating the mixture A to 70-90 ℃, adding 2, 4-toluene diisocyanate, heating to 130-180 ℃ and keeping for 0.8-1.5 hours to obtain a mixture B;
(3) And cooling the mixture B to 60-80 ℃, adding benzoyl chloride, an auxiliary agent and dibutyl tin dilaurate, and uniformly mixing to obtain the ultrathin coating anti-corrosive paint.
Preferably, the method further comprises the steps of cooling the ultra-thin coating anti-corrosive paint to below 60 ℃, weighing and bagging.
According to a further aspect of the application, the application of the ultra-thin coating anti-corrosion paint prepared by any one of the above or any one of the preparation methods in metal anti-corrosion is provided.
Benefits of the present application include, but are not limited to:
1. the ultra-thin coating anti-corrosion coating can reduce the dosage while guaranteeing the anti-corrosion effect, so that the compact coating is tightly combined with the matrix; the viscosity of the coating is about 200cps at 25 ℃, bubbles entrained in the coating are easy to be separated, pinhole phenomenon is not easy to occur, and the excellent coating performance is ensured.
2. In the preparation method of the ultrathin-coating anticorrosive paint, tetrahydrofuran-homopolyether polyol is used as a molecular skeleton, 2, 4-toluene diisocyanate plays a role in active end capping of the tetrahydrofuran-homopolyether polyol, and the end capped tetrahydrofuran-homopolyether polyol is changed from stable end hydroxyl into extremely active isocyanato group, so that a high-molecular-weight polymer anticorrosive material can be formed by self-polymerization in air; the dibutyl tin dilaurate is used as a catalyst, and can catalyze the end-capping reaction and the chain growth of the coating; the storage stability is affected because of extremely active isocyanate groups in the system, and the added benzoyl chloride can play a role in stabilizing the system; each step is carried out step by step, so that the raw materials are ensured to fully react, and the quality of the coating is improved.
3. The ultrathin coating anti-corrosion coating has excellent waterproof performance, and can be coated on the surface of concrete to play a good waterproof role, and can also prevent the surface of the concrete from being pulverized to prevent built-in reinforcing steel bars from corroding and expanding.
4. The ultrathin coating anti-corrosion paint has the advantages of good sealing effect, strong binding force with a matrix, high coating hardness and the like, can well protect and repair most metals and non-metals (such as cement and concrete products), and is suitable for popularization and application.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The raw materials or instruments used are conventional products available commercially without identifying the manufacturer.
The molecular weight of the tetrahydrofuran-homo-polyether polyol is 1300-3600, the viscosity at 25 ℃ is 280-320cps, and the hydroxyl value is 150-190mgKOH/g.
The following describes the specific technical scheme of the present invention with reference to examples:
example 1
The preparation method of the ultra-thin coating anti-corrosion paint comprises the following steps:
(1) 15 parts of toluene is put into a reactor, 95 parts of tetrahydrofuran-homo-polyether polyol is added when the temperature is raised to 40 ℃, and the mixture A is obtained after uniform stirring;
(2) 50 parts of 2, 4-toluene diisocyanate are added when the mixture A is heated to 70 ℃, and the temperature is raised to 130 ℃ and kept for 1.5 hours, so that a mixture B is obtained;
(3) And (3) adding 0.007 parts of benzoyl chloride, 0.001 parts of Tween 80 and 0.01 part of dibutyl tin dilaurate into the mixture B when the temperature is reduced to 60 ℃, and uniformly mixing to obtain the ultra-thin coating anti-corrosive paint.
Example 2
The preparation method of the ultra-thin coating anti-corrosion paint comprises the following steps:
(1) Adding 20 parts of ethyl acetate into a reactor, heating to 45 ℃, adding 98 parts of tetrahydrofuran-homo-polyether polyol, and uniformly stirring to obtain a mixture A;
(2) 70 parts of 2, 4-toluene diisocyanate are added when the mixture A is heated to 75 ℃, and the temperature is raised to 140 ℃ and kept for 1.2 hours, so that a mixture B is obtained;
(3) And (3) adding 0.02 part of benzoyl chloride, 0.003 part of Tween 80 and 0.03 part of dibutyl tin dilaurate into the mixture B when the temperature of the mixture B is reduced to 65 ℃, and uniformly mixing to obtain the ultra-thin coating anti-corrosive paint.
Example 3
The preparation method of the ultra-thin coating anti-corrosion paint comprises the following steps:
(1) Putting 25 parts of a mixture of toluene and ethyl acetate (the mass ratio of the toluene to the ethyl acetate is 1:1) into a reactor, heating to 50 ℃, adding 100 parts of tetrahydrofuran-homo-polyether polyol, and uniformly stirring to obtain a mixture A;
(2) Heating the mixture A to 80 ℃, adding 80 parts of 2, 4-toluene diisocyanate, and heating to 150 ℃ for 1 hour to obtain a mixture B;
(3) And (3) when the temperature of the mixture B is reduced to 70 ℃, adding 0.04 part of benzoyl chloride, 0.006 part of Tween 80 and 0.05 part of dibutyl tin dilaurate, and uniformly mixing to obtain the ultra-thin coating anti-corrosive paint.
Example 4
The preparation method of the ultra-thin coating anti-corrosion paint comprises the following steps:
(1) Adding 30 parts of a mixture of toluene and ethyl acetate (the mass ratio of the toluene to the ethyl acetate is 0.8:1) into a reactor, adding 102 parts of tetrahydrofuran-homo-polyether polyol when the temperature is raised to 55 ℃, and uniformly stirring to obtain a mixture A;
(2) Heating the mixture A to 85 ℃, adding 90 parts of 2, 4-toluene diisocyanate, and heating to 165 ℃ for 0.9 hour to obtain a mixture B;
(3) And (3) adding 0.06 part of benzoyl chloride, 0.008 part of Tween 80 and 0.08 part of dibutyl tin dilaurate into the mixture B when the temperature of the mixture B is reduced to 75 ℃, and uniformly mixing to obtain the ultra-thin coating anti-corrosive paint.
Example 5
The preparation method of the ultra-thin coating anti-corrosion paint comprises the following steps:
(1) 45 parts of ethyl acetate is put into a reactor, 108 parts of tetrahydrofuran-homo-polyether polyol is added when the temperature is raised to 60 ℃, and the mixture A is obtained after uniform stirring;
(2) Heating the mixture A to 90 ℃, adding 100 parts of 2, 4-toluene diisocyanate, heating to 180 ℃ and keeping for 0.8 hour to obtain a mixture B;
(3) And (3) adding 0.07 part of benzoyl chloride, 0.01 part of Tween 80 and 0.1 part of dibutyl tin dilaurate into the mixture B when the temperature of the mixture B is reduced to 80 ℃, and uniformly mixing to obtain the ultra-thin coating anti-corrosive paint.
Comparative example 1
The difference from example 3 is that: the tetrahydrofuran-homo-polyether polyol was replaced with polyoxypropylene triol.
Comparative example 2
The difference from example 3 is that: 2, 4-toluene diisocyanate was replaced with 4-toluene sulfonyl isocyanate.
Comparative example 3
The difference from example 3 is that: dibutyl tin dilaurate was replaced with tributyl tin acrylate.
Comparative example 4
The difference from example 3 is that: the benzoyl chloride is replaced with m-benzoyl chloride.
Comparative example 5
The preparation method of the ultra-thin coating anti-corrosion paint comprises the following steps: and uniformly stirring 25 parts of a mixture of toluene and ethyl acetate (the mass ratio of the toluene to the ethyl acetate is 1:1), 100 parts of tetrahydrofuran-homo-polyether polyol, 80 parts of 2, 4-toluene diisocyanate, 0.04 part of benzoyl chloride, 0.006 part of Tween 80 and 0.05 part of dibutyl tin dilaurate at 70 ℃ to obtain the ultra-thin coating anti-corrosive paint.
Test examples
After 10 pieces of 10cm×10cm ship steel plates were subjected to surface blasting, the anticorrosive coatings of examples 1 to 5 and comparative examples 1 to 5 were sprayed on 10 pieces of steel plates, respectively, to form a coating layer having a thickness of 78 μm, and after the coating layer was dried for 8 hours and cured at room temperature for 7 days, performance test was performed, and the results are shown in table 1.
TABLE 1
As can be obtained from the test results in table 1, the anticorrosive paint prepared by the invention has excellent anticorrosive effect in terms of anticorrosive performance (alkali resistance, acid resistance and salt water resistance); as can be seen from comparative examples 1 to 4, the anticorrosive effect of the paint is reduced more or less and the viscosity, impact resistance and adhesion at 25℃are deteriorated without adding any one of tetrahydrofuran-homo-polyether polyol, 2, 4-toluene diisocyanate, dibutyl tin dilaurate or benzoyl chloride; as can be seen from comparative example 5, the addition sequence of the components, the reaction conditions and parameters have a great influence on the properties of the prepared coating, because the preparation method of the application can ensure that the components fully participate in the reaction, thereby obtaining the high-quality anticorrosive coating.
The foregoing is merely exemplary of the present application, and the scope of the present application is not limited to the specific embodiments, but is defined by the claims of the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the technical ideas and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. The ultra-thin coating anti-corrosion paint is characterized by comprising the following components in parts by weight: 95-108 parts of tetrahydrofuran-homo-polyether polyol, 50-100 parts of 2, 4-toluene diisocyanate, 0.01-0.1 part of dibutyl tin dilaurate, 0.007-0.07 part of benzoyl chloride, 15-45 parts of solvent and 0.001-0.01 part of auxiliary agent.
2. The ultra-thin coating anti-corrosive paint of claim 1, wherein the anti-corrosive paint comprises the following components in parts by weight: 98-102 parts of tetrahydrofuran-homopolyether polyol, 70-90 parts of 2, 4-toluene diisocyanate, 0.03-0.08 part of dibutyl tin dilaurate, 0.02-0.06 part of benzoyl chloride, 20-30 parts of solvent and 0.003-0.008 part of auxiliary agent.
3. The ultra-thin coating anti-corrosive paint of claim 2, wherein the anti-corrosive paint comprises the following components in parts by weight: 100 parts of tetrahydrofuran-homo-polyether polyol, 80 parts of 2, 4-toluene diisocyanate, 0.05 part of dibutyl tin dilaurate, 0.04 part of benzoyl chloride, 25 parts of solvent and 0.006 part of auxiliary agent.
4. The ultra-thin coating corrosion resistant coating of claim 3, wherein said tetrahydrofuran homo-polyether polyol has a molecular weight of 1300-3600.
5. The ultra-thin coating corrosion resistant coating according to claim 3, wherein the tetrahydrofuran homo-polyether polyol has a viscosity of 280-320cps at 25 ℃ and a hydroxyl value of 150-190mgKOH/g.
6. The ultra-thin coating corrosion resistant coating of claim 3, wherein said solvent is selected from one or both of toluene and ethyl acetate.
7. The ultra-thin coating corrosion resistant coating of claim 3, wherein said auxiliary agent is an antifoaming agent, said antifoaming agent is tween 80.
8. A process for the preparation of an ultra-thin coating corrosion protection coating according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
(1) Adding a solvent into a reactor, heating to 40-60 ℃, adding tetrahydrofuran-homo-polyether polyol, and uniformly stirring to obtain a mixture A;
(2) Heating the mixture A to 70-90 ℃, adding 2, 4-toluene diisocyanate, heating to 130-180 ℃ and keeping for 0.8-1.5 hours to obtain a mixture B;
(3) And cooling the mixture B to 60-80 ℃, adding benzoyl chloride, an auxiliary agent and dibutyl tin dilaurate, and uniformly mixing to obtain the ultrathin coating anti-corrosive paint.
9. The method for preparing the ultra-thin coating anti-corrosive paint according to claim 8, further comprising the steps of cooling the ultra-thin coating anti-corrosive paint to below 60 ℃, weighing and bagging.
10. Use of the ultra-thin coating anti-corrosion paint according to any one of claims 1 to 7 or the ultra-thin coating anti-corrosion paint prepared by the preparation method according to any one of claims 8 to 9 in metal corrosion prevention.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210860237.1A CN116102967B (en) | 2022-07-21 | 2022-07-21 | Ultrathin coating anti-corrosion paint and preparation method and application thereof |
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| CN202210860237.1A CN116102967B (en) | 2022-07-21 | 2022-07-21 | Ultrathin coating anti-corrosion paint and preparation method and application thereof |
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| CN116102967B CN116102967B (en) | 2023-10-20 |
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