CN113278353A - Coating and preparation method and application thereof - Google Patents
Coating and preparation method and application thereof Download PDFInfo
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- CN113278353A CN113278353A CN202110487745.5A CN202110487745A CN113278353A CN 113278353 A CN113278353 A CN 113278353A CN 202110487745 A CN202110487745 A CN 202110487745A CN 113278353 A CN113278353 A CN 113278353A
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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
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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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
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
- C08J2475/08—Polyurethanes from polyethers
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- Chemical & Material Sciences (AREA)
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a coating and a preparation method and application thereof. The coating is mainly prepared from the following raw materials in parts by weight: 100-150 parts of isocyanate, 500-650 parts of hydroxyl polyether polyol, 55-65 parts of fluorocarbon modified acrylate, 20-30 parts of catalyst, 25-50 parts of chain extender, 0-10 parts of antioxidant, 0-10 parts of anti-ultraviolet assistant, 750-1050 parts of solvent, 0-10 parts of dispersant and 0-20 parts of defoaming agent. The polyurethane coating formed by the coating can realize instantaneous repair, is scratch-resistant, has strong hydrophobicity and high adhesive force, is simple in preparation method, and is convenient for industrial production and application.
Description
Technical Field
The invention belongs to the field of coatings and protective coatings, and particularly relates to a coating and a preparation method and application thereof.
Background
The continuous accumulation of family wealth makes automobiles more popular with Chinese families. By the end of 2020, the automobile reserves in our country have exceeded 3.1 million. The large automobile reserves have urged a large automobile maintenance market.
In the long-term practical use process of an automobile, sand dust, acid rain, printing ink, pollutants and the like in the environment can generate damage effects such as impact, corrosion, pollution and the like on the automobile paint, so that the problems of damage, dirtying, cracking, dissolution and the like of the automobile paint are caused. Traditional safeguard measure is waxing, polishing on the car lacquer surface, and this kind of mode needs the car to go to maintenance mechanism regularly and maintains, not only brings the trouble for the car owner, can increase car owner's economic burden moreover. A new protective measure originated in the united states is to fit a stealth car cover. Because the invisible car cover can effectively protect the car paint and has the function of scratch resistance, the number of times that the car goes to a maintenance mechanism for maintenance is reduced, and the economic burden of a car owner is obviously reduced. Currently, most car owners change back to extended use stealth car covers after purchasing a new car.
The invisible car cover technology in China is still in the starting and development stage, most of the invisible car covers protect the car paint by means of excellent scratch resistance and breakage resistance, and meanwhile, the effect of prolonging the service cycle of the car cover is achieved. The invisible car cover top coat mainly uses PU materials, can realize instant repair of damaged parts, and has no trace, however, the self-repair time of the related self-repair top coat product in China is long at present, and the second repair function cannot be realized. Therefore, the practical use of related products is limited, and a top coating PU material with short self-repairing time and good effect needs to be developed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the coating, the preparation method and the application thereof so as to realize instant repair, and the obtained coating has the characteristics of scratch resistance, strong hydrophobicity, high adhesive force and the like, and has good comprehensive performance and good protection effect.
In order to achieve the above purpose, in a first aspect, the present invention provides a coating, which is mainly prepared from the following raw materials by weight:
the newly formed polyurethane coating of the coating contains more soft segment structures, and the soft segment structures can rapidly generate the migration motion of molecular chain segments at normal temperature after the coating is dried, so that conditions are provided for the instant repair of the surface of the scraped coating, and the scraped coating is free of traces; the coating is scratch-resistant, hydrophobic and oleophobic, has strong adhesive force on the matrix, and can provide better protection for the matrix. In the research process, the inventor finds that compared with the use of unmodified acrylate and fluorocarbon modified acrylate, the use of organic silicon modified acrylate is beneficial to improving the smoothness of the coating, reducing the friction coefficient of the surface of the coating and improving the fine hand feeling of the coating.
Preferably, the isocyanate is at least one of TDI trimer, MDI trimer. By selecting tripolymer MDI tripolymer and TDI tripolymer with benzene rings, the crosslinking density of the coating can be improved, a more compact crosslinking system network is formed, the stain resistance of the coating is improved, and the chemical resistance is improved.
Preferably, the hydroxyl polyether polyol is at least one of PTMEG1000 and PPG 1000. When the hydroxyl polyether polyol is at least one of PTMEG1000 and PPG1000, the obtained coating has excellent hydrolysis resistance, and the service life of the coating is obviously prolonged.
Preferably, the catalyst is a metal organic catalyst.
Preferably, the catalyst comprises at least one of dibutyltin dilaurate, bismuth neodecanoate and bismuth naphthenate.
Preferably, the chain extender is at least one of 1, 3-butanediol and 1, 4-butanediol.
Preferably, the antioxidant comprises at least one of 2, 6-di-tert-butyl-4-methylphenol and 3, 5-di-tert-butyl-4-hydroxyphenyl tetraol ester.
Preferably, the ultraviolet resistance auxiliary agent is at least one of benzotriazole and benzophenone.
Preferably, the dispersant is at least one of sodium oleate and sodium dodecyl benzene sulfonate.
Preferably, the defoaming agent is at least one of BYK028 and BYK-W961 of Bick and DF-691 of Rodia. That is, the defoaming agent is preferably at least one of BYK028 of Pick, BYK-W961 of Pick, and DF-691 of Rodiya.
Preferably, the solvent is butanone, ethyl acetate, and tetrahydrofuran. More preferably, the weight ratio of butanone, ethyl acetate and tetrahydrofuran in the solvent is butanone: ethyl acetate: tetrahydrofuran is 1:4: 1.
Preferably, the chain extender is 25 to 30 parts by weight.
Preferably, the antioxidant is 5 to 10 parts by weight.
Preferably, the anti-ultraviolet auxiliary agent is 5-10 parts by weight.
The antioxidant and the anti-ultraviolet auxiliary agent are added into the coating, so that the yellowing tendency of the coating can be effectively inhibited, and the service cycle of the film-forming coating is prolonged.
Preferably, the dispersant is 5 to 10 parts by weight.
Preferably, the defoaming agent is 10 to 20 parts by weight.
In a second aspect, the present invention provides a method for preparing the above coating, which comprises the following steps:
(1) under the protection of protective gas, mixing hydroxyl polyether polyol, not more than half of isocyanate and not more than half of solvent, and dispersing at 60-70 ℃ to obtain a first intermediate material;
(2) cooling the first intermediate material to 45-50 ℃, adding organic silicon modified acrylate, a catalyst, a chain extender and the residual isocyanate, and heating to 65-75 ℃ for reaction to prepare a second intermediate material;
(3) and cooling the second intermediate material to 45-50 ℃, adding the residual solvent, the antioxidant, the anti-ultraviolet auxiliary agent, the dispersant and the defoamer, and dispersing to obtain the coating.
Preferably, in the step (1), dispersing is carried out for 5-20min at 800-1000 rpm; in the step (2), the temperature is raised to 65-75 ℃ at the speed of 1000rpm of 800-; in the step (3), the residual solvent is added firstly, and is dispersed for 5-15min at 800rpm of 500-.
In a third aspect, the invention also provides a coating which is prepared by adopting the coating. The coating is constructed on a TPU (thermoplastic polyurethane elastomer rubber) base film in a blade coating, roll coating or coating mode through a coating machine and the like, the invisible car cover with good self-repairing effect can be obtained after curing and film forming after high-temperature treatment, such as standing for 3 minutes at 100 ℃, and the formed coating is the top coating of the invisible car cover.
In a fourth aspect, the invention also provides a vehicle cover, and the top coating layer is the coating.
Compared with the prior art, the invention has the beneficial effects that:
(1) the polyurethane coating formed by the coating contains more soft segment structures, and the soft segment structures can rapidly generate the migration motion of molecular chain segments at normal temperature after being dried, so that conditions are provided for the instant repair of the surface of the scraped coating, and the scraped coating is free of traces; the coating is scratch-resistant, hydrophobic and oleophobic, has strong adhesive force on the matrix, and can provide better protection for the matrix.
(2) The raw materials of the coating and the coating are easy to obtain, and the preparation method is simple and is suitable for industrial production and application.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples. It will be understood by those skilled in the art that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the examples, the experimental methods used were all conventional methods unless otherwise specified, and the materials, reagents and the like used were commercially available without otherwise specified.
PTMEG (tetrahydrofuran homopolyether) used by the inventor in the research process is purchased from Xinghua Kogyo Co., Ltd. in Zhejiang and has the molecular weight of 1000-2000-. The hydroxyl polyether polyol with different molecular weight can be selected according to the needs, and the hydroxyl polyether polyol with the molecular weight of 1000 is used in the embodiment of the invention, but the hydroxyl polyether polyol used for implementing the invention is not limited to the above manufacturer and the specific performance parameters.
Example 1
The embodiment provides a coating, which is prepared from the following raw materials in parts by weight: 150 parts of isocyanate, 65 parts of organic silicon modified acrylate, 650 parts of hydroxyl polyether polyol, 30 parts of catalyst, 50 parts of chain extender, 10 parts of antioxidant, 10 parts of anti-ultraviolet assistant, 950 parts of solvent, 10 parts of dispersant and 20 parts of defoaming agent. Wherein, TDI tripolymer is selected as isocyanate; selecting PTMEG1000 as hydroxyl polyether polyol; selecting dibutyltin dilaurate as a catalyst; the chain extender is 1, 4-butanediol; the antioxidant is 2, 6-di-tert-butyl-4-methylphenol; benzotriazole is selected as the anti-ultraviolet auxiliary agent; the solvent is a mixture of butanone, ethyl acetate and tetrahydrofuran, and the weight ratio of the butanone to the ethyl acetate to the tetrahydrofuran is that the butanone is: ethyl acetate: tetrahydrofuran 1:4: 1; the dispersing agent is sodium dodecyl benzene sulfonate; the antifoaming agent is BYK028 from Picker.
The preparation method of the coating of the embodiment is as follows:
(1) continuously introducing nitrogen into a reaction kettle of at least 1L for 5min, adding 75 parts by weight of TDI trimer, 650 parts by weight of hydroxyl-terminated polyether polyol, 125 parts by weight of butanone, 200 parts by weight of ethyl acetate and 125 parts by weight of tetrahydrofuran into the reaction kettle, and dispersing at 70 ℃ for 5min at the rotating speed of 800 rpm;
(2) then, cooling to 45 ℃, adding 75 parts by weight of TDI trimer, 65 parts by weight of organic silicon modified acrylate, 30 parts by weight of dibutyltin dilaurate and 50 parts by weight of 1, 4-butanediol into a reaction kettle, dispersing at the rotating speed of 800rpm, heating to 70 ℃, and reacting at constant temperature for 2 hours;
(3) cooling to 45 ℃, adding 100 parts by weight of butanone, 300 parts by weight of ethyl acetate and 100 parts by weight of tetrahydrofuran into a reaction kettle, and dispersing for 15min at the rotating speed of 500 rpm;
(4) adding 10 parts by weight of 2, 6-di-tert-butyl-4-methylphenol, 10 parts by weight of benzotriazole, 10 parts by weight of sodium dodecyl benzene sulfonate and 20 parts by weight of BYK028 defoaming agent into a reaction kettle, and dispersing at the rotating speed of 500rpm for 60min to obtain the coating.
The coating of the embodiment is coated on a TPU base film by a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the scratch-resistant invisible car cover top coating is formed.
Example 2
The embodiment provides a coating, which is prepared from the following raw materials in parts by weight: 125 parts of isocyanate, 60 parts of organic silicon modified acrylate, 600 parts of hydroxyl polyether polyol, 25 parts of catalyst, 40 parts of chain extender, 8 parts of antioxidant, 8 parts of anti-ultraviolet assistant, 950 parts of solvent, 8 parts of dispersant and 15 parts of defoaming agent. Wherein, TDI tripolymer is selected as isocyanate; selecting PTMEG1000 as hydroxyl polyether polyol; selecting dibutyltin dilaurate as a catalyst; the chain extender is 1, 4-butanediol; the antioxidant is 2, 6-di-tert-butyl-4-methylphenol; benzotriazole is selected as the anti-ultraviolet auxiliary agent; the solvent is a mixture of butanone, ethyl acetate and tetrahydrofuran, and the weight ratio of the butanone to the ethyl acetate to the tetrahydrofuran is that the butanone is: ethyl acetate: tetrahydrofuran 1:4: 1; the dispersing agent is sodium dodecyl benzene sulfonate; the antifoaming agent is BYK028 from Picker.
The preparation method of the coating of the embodiment is as follows:
(1) continuously introducing nitrogen into a reaction kettle of at least 1L for 5min, adding 62.5 parts by weight of TDI trimer, 600 parts by weight of hydroxyl-terminated polyether polyol, 125 parts by weight of butanone, 200 parts by weight of ethyl acetate and 125 parts by weight of tetrahydrofuran into the reaction kettle, and dispersing at 70 ℃ for 5min at the rotating speed of 800 rpm;
(2) then cooling to 45 ℃, adding 62.5 parts by weight of TDI trimer, 60 parts by weight of organic silicon modified acrylate, 25 parts by weight of dibutyltin dilaurate and 40 parts by weight of 1, 4-butanediol into a reaction kettle, dispersing at the rotating speed of 800rpm, heating to 70 ℃, and reacting at constant temperature for 2 hours;
(3) cooling to 45 ℃, adding 50 parts by weight of butanone, 400 parts by weight of ethyl acetate and 50 parts by weight of tetrahydrofuran into a reaction kettle, and dispersing for 15min at the rotating speed of 500 rpm;
(4) adding 8 parts by weight of 2, 6-di-tert-butyl-4-methylphenol, 8 parts by weight of benzotriazole, 8 parts by weight of sodium dodecyl benzene sulfonate and 15 parts by weight of BYK028 defoaming agent into a reaction kettle, and dispersing at the rotating speed of 500rpm for 60min to obtain the coating.
The coating of the embodiment is coated on a TPU base film by a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the scratch-resistant invisible car cover top coating is formed.
Example 3
The embodiment provides a coating, which is prepared from the following raw materials in parts by weight: 100 parts of isocyanate, 55 parts of organic silicon modified acrylate, 500 parts of hydroxyl polyether polyol, 25 parts of catalyst, 30 parts of chain extender, 5 parts of antioxidant, 8 parts of anti-ultraviolet assistant, 1050 parts of solvent, 10 parts of dispersant and 20 parts of defoaming agent. Wherein, TDI tripolymer is selected as isocyanate; selecting PTMEG1000 as hydroxyl polyether polyol; selecting dibutyltin dilaurate as a catalyst; the chain extender is 1, 4-butanediol; the antioxidant is 2, 6-di-tert-butyl-4-methylphenol; benzotriazole is selected as the anti-ultraviolet auxiliary agent; the solvent is a mixture of butanone, ethyl acetate and tetrahydrofuran, and the weight ratio of the butanone to the ethyl acetate to the tetrahydrofuran is that the butanone is: ethyl acetate: tetrahydrofuran 1:4: 1; the dispersing agent is sodium dodecyl benzene sulfonate; the antifoaming agent is BYK028 from Picker.
The preparation method of the coating of the embodiment is as follows:
(1) continuously introducing nitrogen into a reaction kettle of at least 1L for 5min, adding 50 parts by weight of TDI trimer, 500 parts by weight of hydroxyl-terminated polyether polyol, 125 parts by weight of butanone, 200 parts by weight of ethyl acetate and 125 parts by weight of tetrahydrofuran into the reaction kettle, and dispersing at 70 ℃ for 5min at the rotating speed of 800 rpm;
(2) then cooling to 45 ℃, adding 50 parts by weight of TDI trimer, 55 parts by weight of organic silicon modified acrylate, 25 parts by weight of dibutyltin dilaurate and 30 parts by weight of 1, 4-butanediol into a reaction kettle, dispersing at the rotating speed of 800rpm, heating to 70 ℃, and reacting at constant temperature for 2 hours;
(3) cooling to 45 ℃, adding 50 parts by weight of butanone, 500 parts by weight of ethyl acetate and 50 parts by weight of tetrahydrofuran into a reaction kettle, and dispersing for 15min at the rotating speed of 500 rpm;
(4) adding 5 parts by weight of 2, 6-di-tert-butyl-4-methylphenol, 8 parts by weight of benzotriazole, 10 parts by weight of sodium dodecyl benzene sulfonate and 20 parts by weight of BYK028 defoaming agent into a reaction kettle, and dispersing at the rotating speed of 500rpm for 60min to obtain the coating.
The coating of the embodiment is coated on a TPU base film by a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the scratch-resistant invisible car cover top coating is formed.
Example 4
The embodiment provides a coating, which is prepared from the following raw materials in parts by weight: 120 parts of isocyanate, 65 parts of organic silicon modified acrylate, 500 parts of hydroxyl polyether polyol, 30 parts of catalyst, 25 parts of chain extender, 10 parts of antioxidant, 5 parts of anti-ultraviolet auxiliary agent, 1050 parts of solvent, 8 parts of dispersing agent and 15 parts of defoaming agent. Wherein, TDI tripolymer is selected as isocyanate; selecting PTMEG1000 as hydroxyl polyether polyol; selecting dibutyltin dilaurate as a catalyst; the chain extender is 1, 4-butanediol; the antioxidant is 2, 6-di-tert-butyl-4-methylphenol; benzotriazole is selected as the anti-ultraviolet auxiliary agent; the solvent is a mixture of butanone, ethyl acetate and tetrahydrofuran, and the weight ratio of the butanone to the ethyl acetate to the tetrahydrofuran is that the butanone is: ethyl acetate: tetrahydrofuran 1:4: 1; the dispersing agent is sodium dodecyl benzene sulfonate; the antifoaming agent is BYK028 from Picker.
The preparation method of the coating of the embodiment is as follows:
(1) continuously introducing nitrogen into a reaction kettle of at least 1L for 5min, adding 60 parts by weight of TDI trimer, 500 parts by weight of hydroxyl-terminated polyether polyol, 125 parts by weight of butanone, 200 parts by weight of ethyl acetate and 125 parts by weight of tetrahydrofuran into the reaction kettle, and dispersing at 70 ℃ for 5min at the rotating speed of 800 rpm;
(2) then cooling to 45 ℃, adding 60 parts by weight of TDI trimer, 65 parts by weight of organic silicon modified acrylate, 30 parts by weight of dibutyltin dilaurate and 30 parts by weight of 1, 4-butanediol into a reaction kettle, dispersing at the rotating speed of 800rpm, heating to 70 ℃, and reacting at constant temperature for 2 hours;
(3) cooling to 45 ℃, adding 50 parts by weight of butanone, 500 parts by weight of ethyl acetate and 50 parts by weight of tetrahydrofuran into a reaction kettle, and dispersing for 15min at the rotating speed of 500 rpm;
(4) adding 10 parts by weight of 2, 6-di-tert-butyl-4-methylphenol, 5 parts by weight of benzotriazole, 8 parts by weight of sodium dodecyl benzene sulfonate and 15 parts by weight of BYK028 defoaming agent into a reaction kettle, and dispersing at the rotating speed of 500rpm for 60min to obtain the coating.
The coating of the embodiment is coated on a TPU base film by a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the scratch-resistant invisible car cover top coating is formed.
Comparative example 1
The comparative example provides a coating, which is prepared from the following raw materials in parts by weight: 100 parts of aromatic diisocyanate, 400 parts of hydroxyl polyether polyol, 10 parts of catalyst, 20 parts of chain extender and 260 parts of solvent. Wherein the aromatic diisocyanate is 2, 4-toluene diisocyanate; selecting trihydroxy polyether polyol as hydroxyl polyether polyol, wherein the molecular weight is 1000; the catalyst was dibutyltin dilaurate; the chain extender is 1, 4-butanediol; the solvent is selected from dimethylbenzene and cyclohexanone in a weight ratio of 1: 1.
The preparation method of the comparative example paint was as follows:
(1) continuously introducing nitrogen into a reaction kettle of at least 5L for 10min, adding 100 parts by weight of 2, 4-toluene diisocyanate, 400 parts by weight of trihydroxy polyether polyol, 65 parts by weight of xylene and 65 parts by weight of cyclohexanone into the reaction kettle, and dispersing at 75 ℃ at the rotating speed of 800rpm for 3 h;
(2) then cooling to 50 ℃, adding 10 parts by weight of dibutyltin dilaurate and 20 parts by weight of 1, 4-butanediol into a reaction kettle, dispersing at the rotating speed of 800rpm, heating to 75 ℃, and reacting at constant temperature for 3.5 h;
(3) and cooling to 40 ℃, adding 65 parts by weight of dimethylbenzene and 65 parts by weight of ethyl acetate into the reaction kettle, and dispersing for 5min at the rotating speed of 800rpm to obtain the coating.
The coating of the comparative example is coated on a TPU base film by a coating machine, baked for 3 minutes at 100 ℃ and solidified into a film to form the top coating of the invisible car cover.
Effect example 1
At normal temperature, scratching the surface of the coating layer by a corresponding depth through a nano scratching instrument, observing the recovery condition of the scratches, and recording the time required for recovery. The results are shown in Table 1.
TABLE 1 self repair test results
As can be seen from Table 1, the scratch-resistant invisible top coating of the car cover prepared by the embodiment of the invention can instantly realize no scratch on the surface of the car cover under the condition of the same scratch depth at the same temperature, and compared with the comparative example 1, the scratch-resistant invisible top coating meets the high performance requirements of scratch resistance and no scratch residue.
Effect example 2
Contact angles of water and diiodomethane on the top coats of the stealth car covers formed in each example and comparative example were measured separately under the same environment and the results are shown in table 2.
TABLE 2 contact Angle measurement results
As can be seen from Table 2, the scratch-resistant invisible car cover top coating prepared by each example shows higher water contact angle at the same temperature, and realizes higher hydrophobic capacity compared with the comparative ratio 1; the water contact angle and the oil contact angle of the coating are improved along with the increase of the use amount of the fluorocarbon modified acrylate.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The coating is characterized by being mainly prepared from the following raw materials in parts by weight:
2. the coating of claim 1, wherein the isocyanate is at least one of a TDI trimer and an MDI trimer.
3. The coating of claim 1, wherein the hydroxyl polyether polyol is at least one of PTMEG1000, PPG 1000.
4. The coating of claim 1, wherein the catalyst is a metal organic catalyst, preferably comprising at least one of dibutyltin dilaurate, bismuth neodecanoate, bismuth naphthenate; the chain extender is at least one of 1, 3-butanediol and 1, 4-butanediol.
5. The coating of claim 1, wherein the antioxidant comprises at least one of 2, 6-di-tert-butyl-4-methylphenol, 3, 5-di-tert-butyl-4-hydroxyphenyl tetraol ester; the anti-ultraviolet auxiliary agent is at least one of benzotriazole and benzophenone; the dispersant is at least one of sodium oleate and sodium dodecyl benzene sulfonate; the defoaming agent is at least one of BYK028 and BYK-W961 of Pico company and DF-691 of Rodia company; the solvent is butanone, ethyl acetate and tetrahydrofuran, and the weight ratio of the butanone to the ethyl acetate to the tetrahydrofuran in the solvent is preferably 1:4: 1.
6. The coating of claim 1, wherein the chain extender is 25 to 30 parts by weight; the antioxidant accounts for 5-10 parts by weight; 5-10 parts of anti-ultraviolet auxiliary agent; 5-10 parts by weight of a dispersing agent; the defoaming agent accounts for 10-20 parts by weight.
7. The method of preparing a coating according to claim 1, comprising the steps of:
(1) under the protection of protective gas, mixing hydroxyl polyether polyol, not more than half of isocyanate and not more than half of solvent, and dispersing at 60-70 ℃ to obtain a first intermediate material;
(2) cooling the first intermediate material to 45-50 ℃, adding organic silicon modified acrylate, a catalyst, a chain extender and the residual isocyanate, and heating to 65-75 ℃ for reaction to prepare a second intermediate material;
(3) and cooling the second intermediate material to 45-50 ℃, adding the residual solvent, the antioxidant, the anti-ultraviolet auxiliary agent, the dispersant and the defoamer, and dispersing to obtain the coating.
8. The preparation method as claimed in claim 7, wherein in the step (1), the dispersion is carried out at 800-1000rpm for 5-20 min; in the step (2), the temperature is raised to 65-75 ℃ at the speed of 1000rpm of 800-; in the step (3), the residual solvent is added firstly, and is dispersed for 5-15min at 800rpm of 500-.
9. A coating prepared using the coating of claim 1.
10. A vehicle cover, characterized in that the top coat of the vehicle cover is the coating of claim 9.
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| CN114213950A (en) * | 2021-12-22 | 2022-03-22 | 广东粤港澳大湾区黄埔材料研究院 | Scratch-resistant vehicle coat top coating and application thereof |
| CN114752293A (en) * | 2022-03-11 | 2022-07-15 | 中国科学院宁波材料技术与工程研究所 | Coating material for automobile coating film and preparation method thereof |
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