Self-repairing coating and preparation method thereof

Abstract

The invention discloses a self-repairing coating and a preparation method thereof, and relates to the field of coatings for electronic equipment protective films. Comprising the following components in parts by weight: 20 to 30 parts of dicycloheptyl urethane acrylate, 15 to 25 parts of adamantyl urethane acrylate, 10 to 20 parts of polyhydroxy neopentyl glycol acetal acrylate, 10 to 15 parts of hydroxyl hexyl acrylate, 5 to 10 parts of tetrahydrofuran acrylate, 1 to 5 parts of reactive organosilicon polyether acrylate, 1 to 3 parts of a photoinitiator, 0.5 to 1 part of a flatting agent and 20 to 30 parts of a solvent. The coating provided by the scheme can realize excellent self-repairing effect and performance without additional rear-end curing after UV curing.

Description

Technical Field

[0001] The present invention relates to the field of coatings for electronic equipment protective films, specifically a self-repairing coating and a preparation method thereof. Background Art

[0002] In the existing folding screen protective film applications, the development of self-healing coatings faces many technical challenges. Traditional self-healing coatings usually rely on thermal curing and require a long period of back-end aging to ensure that the coating has high stability and sufficient self-healing performance. However, this technology brings the following disadvantages:

[0003] 1. The back-end aging process is time-consuming and affects production efficiency. Many existing coatings still require a long period of back-end aging after UV curing in order to achieve the expected hardness and stability. This process is not only time-consuming, but also requires additional equipment and space, which significantly reduces production efficiency, increases manufacturing costs, and is not conducive to large-scale production applications.

[0004] 2. In the application of folding screen protective film, the existing coating is prone to adhesion on the surface during repeated folding, affecting the user experience. The anti-adhesion performance of traditional coatings is limited, and it is difficult to meet the high requirements for surface anti-adhesion when the folding screen is repeatedly folded, especially in high temperature or long-term environment.

[0005] 3. Some existing coatings have limited self-healing properties, especially poor hydrophobicity, with a water drop angle usually below 100°. This makes the coating surface susceptible to erosion by water or oil, thereby reducing the aesthetics and durability of the coating. It is difficult for existing technologies to simultaneously take into account self-healing and hydrophobicity, which limits the application scenarios of the coating.

[0006] 4. The wear resistance of existing coatings usually cannot meet the needs of high-frequency use. The number of copper brush wear tests is often less than 300 times, which makes the coating prone to wear and scratches in actual use, thus affecting the appearance and service life of the protective film. Especially in the application of folding screens, repeated folding exacerbates the wear problem, and traditional coatings are difficult to maintain integrity for a long time. Summary of the invention

[0007] The purpose of this application is to provide a technical solution to solve the problems raised in the above background technology.

[0008] To achieve the above objectives, this application provides the following technical solutions:

[0009] A self-repairing coating, comprising, by weight:

[0010]

[0011]

[0012] Preferably, the dicycloheptyl polyurethane acrylate is one or more of Mitsubishi Chemical AUR-7X03, Mitsubishi Chemical AUR-7X04, DSM NeoRad R-4505, DSM NeoRad R-4506, Bayer MaterialScience Desmolux D-100, Bayer MaterialScience Desmolux D-101, Arkema Sartomer SR9004, and Arkema Sartomer SR9005.

[0013] Preferably, the adamantyl polyurethane acrylate is one or more of Mitsubishi Chemical AD-102, DSM NeoRad A-350, Bayer MaterialScience Desmolux A-200, Arkema Sartomer SA510, Evonik Industries TEGO Rad 2600, BASF Laromer GA 9020, Shin-Etsu Chemical KBE-810, and Dow Chemical XUS 35700.

[0014] Preferably, the polyol neopentyl glycol acetal acrylate is one or more of Mitsubishi Chemical NPA-205, DSM NeoRad NP-600, Bayer MaterialScience Desmolux NP-400, Arkema Sartomer NP510, Evonik Industries TEGO Rad NP2700, BASF Laromer NP9025, Shin-Etsu Chemical KBE-NP320, and Dow Chemical XUS NP35800.

[0015] A method for preparing a self-repairing coating comprises the following steps:

[0016] (1) 20-30 parts by weight of dicycloheptyl polyurethane acrylate, 15-25 parts by weight of adamantyl polyurethane acrylate and 10-20 parts by weight of polyvinyl neopentyl glycol acetal acrylate are sequentially added into a closed reaction kettle, and then 10-15 parts by weight of butyl acrylate and 1-5 parts by weight of reactive silicone polyether acrylate are sequentially added, and the mixture is uniformly mixed by high-speed ultrasonic dispersion and stirring;

[0017] (2) Slowly add 1-3 parts of photoinitiator and 0.5-1 parts of leveling agent while stirring continuously and continue to stir until evenly dispersed;

[0018] (3) slowly adding 20-30 parts of solvent to the stirred mixture and stirring at a low speed until the solution is free of impurities;

[0019] (4) using a coating device to evenly coat the mixture on the surface of the substrate, heating it to 60-80° C. for thermal curing, and volatilizing the solvent to form a preliminary coating;

[0020] (5) Irradiate under a high-pressure UV lamp to completely cure the coating to obtain a self-healing coating.

[0021] Preferably, the photoinitiator is 184 photoinitiator.

[0022] Preferably, the leveling agent is BYK333 organic silicone leveling agent.

[0023] Preferably, the solvent is a mixed solvent of ethyl acetate and toluene.

[0024] In summary, the technical effects and advantages of the present invention are as follows:

[0025] 1. The coating of this solution can achieve excellent self-healing effect and performance without additional back-end aging after UV curing.

[0026] 2. The coating of this solution has excellent anti-adhesion effect. When applied to the folding screen protective film, no adhesion will occur on the coating surface.

[0027] 3. The water drop angle of the coating in this scheme is in the range of 100-110°, and its self-healing hydrophobic performance is excellent.

[0028] 4. The copper brush resistance test results of the coating in this solution are all above 300 times, and the highest can reach 500 times, with excellent wear resistance. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] A method for preparing a self-repairing coating comprises the following steps:

[0031] (1) 20-30 parts by weight of dicycloheptyl polyurethane acrylate, 15-25 parts by weight of adamantyl polyurethane acrylate and 10-20 parts by weight of polyvinyl neopentyl glycol acetal acrylate are sequentially added into a closed reaction kettle, and then 10-15 parts by weight of butyl acrylate and 1-5 parts by weight of reactive silicone polyether acrylate are sequentially added, and the mixture is uniformly mixed by high-speed ultrasonic dispersion and stirring;

[0032] (2) Slowly add 1-3 parts of photoinitiator and 0.5-1 parts of leveling agent while stirring continuously and continue to stir until evenly dispersed;

[0033] (3) slowly adding 20-30 parts of solvent to the stirred mixture, adjusting the viscosity to a coating state, and then continuing to stir at a low speed until the solution is free of impurities;

[0034] (4) using a coating device to evenly coat the mixture on the surface of the substrate, heating it to 60-80° C. for thermal curing, and volatilizing the solvent to form a preliminary coating;

[0035] (5) Irradiating under a high-pressure UV lamp completely cures the dicycloheptyl polyurethane acrylate, adamantyl polyurethane acrylate, and poly-neopentyl glycol acetal acrylate materials in the coating, thereby obtaining a self-repairing coating without the need for back-end aging.

[0036] Embodiment 1:

[0037] Bicycloheptyl polyurethane acrylate: 25 parts (Mitsubishi Chemical AUR-7X03),

[0038] Adamantyl polyurethane acrylate: 20 parts (DSM NeoRad A-350),

[0039] Polyhydroxy neopentyl glycol acetal acrylate: 15 parts (Mitsubishi Chemical NPA-205),

[0040] Hydroxyethyl acrylate: 12 parts,

[0041] Tetrahydrofuran acrylate: 8 parts,

[0042] Reactive silicone polyether acrylate: 3 parts (TEGO I200N),

[0043] Photoinitiator: 2 parts (184 photoinitiator),

[0044] Leveling agent: 0.7 parts (BYK333 silicone leveling agent),

[0045] Solvent: 25 parts (mixture of ethyl acetate and toluene).

[0046] Embodiment 2:

[0047] Biscycloheptyl polyurethane acrylate: 28 parts (DSM NeoRad R-4505),

[0048] Adamantyl polyurethane acrylate: 18 parts (Bayer MaterialScience Desmolux A-200),

[0049] Polyhydroxy neopentyl glycol acetal acrylate: 12 parts (DSM NeoRad NP-600), hydroxyethyl acrylate: 10 parts,

[0050] Tetrahydrofuran acrylate: 6 parts,

[0051] Reactive silicone polyether acrylate: 4 parts (TEGO I200N),

[0052] Photoinitiator: 1.5 parts (184 photoinitiator),

[0053] Leveling agent: 0.6 parts (BYK333 silicone leveling agent),

[0054] Solvent: 20 parts (mixture of ethyl acetate and toluene).

[0055] Embodiment 3:

[0056] Bicycloheptyl polyurethane acrylate: 24 parts (Bayer Material Science Desmolux D-100), adamantyl polyurethane acrylate: 23 parts (Arkema Sartomer SA510), polyhydroxy neopentyl glycol acetal acrylate: 14 parts (Bayer Material Science Desmolux NP-400), hydroxyhexyl acrylate: 11 parts,

[0057] Tetrahydrofuran acrylate: 7 parts,

[0058] Reactive silicone polyether acrylate: 3 parts (TEGO I200N),

[0059] Photoinitiator: 2.5 parts (184 photoinitiator),

[0060] Leveling agent: 0.5 parts (BYK333 silicone leveling agent),

[0061] Solvent: 30 parts (mixture of ethyl acetate and toluene).

[0062] Embodiment 4:

[0063] Bicycloheptyl polyurethane acrylate: 30 parts (Arkema Sartomer SR9004), adamantyl polyurethane acrylate: 17 parts (Evonik Industries TEGO Rad 2600), polyhydroxy neopentyl glycol acetal acrylate: 16 parts (Arkema Sartomer NP510), hydroxyhexyl acrylate: 13 parts,

[0064] Tetrahydrofuran acrylate: 9 parts,

[0065] Reactive silicone polyether acrylate: 2 parts (TEGO I200N),

[0066] Photoinitiator: 2 parts (184 photoinitiator),

[0067] Leveling agent: 0.8 parts (BYK333 silicone leveling agent),

[0068] Solvent: 25 parts (mixture of ethyl acetate and toluene).

[0069] Embodiment 5:

[0070] Bicycloheptyl polyurethane acrylate: 22 parts (TEGO Rad 2500 from Evonik Industries), adamantyl polyurethane acrylate: 22 parts (Laromer GA 9020 from BASF), polyhydroxy neopentyl glycol acetal acrylate: 13 parts (TEGO Rad NP2700 from Evonik Industries), hydroxyhexyl acrylate: 11 parts,

[0071] Tetrahydrofuran acrylate: 8 parts,

[0072] Reactive silicone polyether acrylate: 4 parts (TEGO I200N),

[0073] Photoinitiator: 2.5 parts (184 photoinitiator),

[0074] Leveling agent: 0.7 parts (BYK333 silicone leveling agent),

[0075] Solvent: 20 parts (mixture of ethyl acetate and toluene).

[0076] Embodiment 6:

[0077] Bicycloheptyl urethane acrylate: 27 parts (Laromer UA 9063 from BASF), adamantyl urethane acrylate: 19 parts (KBE-810 from Shin-Etsu Chemical),

[0078] Polyhydroxy neopentyl glycol acetal acrylate: 15 parts (BASF Laromer NP9025), hydroxyethyl acrylate: 10 parts,

[0079] Tetrahydrofuran acrylate: 7 parts,

[0080] Reactive silicone polyether acrylate: 3 parts (TEGO I200N),

[0081] Photoinitiator: 1.8 parts (184 photoinitiator),

[0082] Leveling agent: 0.6 parts (BYK333 silicone leveling agent),

[0083] Solvent: 25 parts (mixture of ethyl acetate and toluene).

[0084] Embodiment 7:

[0085] Bicycloheptyl polyurethane acrylate: 29 parts (Shin-Etsu Chemical KBE-705), adamantyl polyurethane acrylate: 21 parts (Dow Chemical XUS 35700), polyhydroxy neopentyl glycol acetal acrylate: 12 parts (Shin-Etsu Chemical KBE-NP320), hydroxyhexyl acrylate: 12 parts,

[0086] Tetrahydrofuran acrylate: 9 parts, reactive silicone polyether acrylate: 2 parts (TEGO I200N),

[0087] Photoinitiator: 2 parts (184 photoinitiator),

[0088] Leveling agent: 0.7 parts (BYK333 silicone leveling agent),

[0089] Solvent: 20 parts (mixture of ethyl acetate and toluene).

[0090] Embodiment 8:

[0091] Bicycloheptyl polyurethane acrylate: 23 parts (Dow Chemical XUS 35533), adamantyl polyurethane acrylate: 24 parts (Mitsubishi Chemical AD-102), polyhydroxy neopentyl glycol acetal acrylate: 14 parts (DSM NeoRad NP-600), hydroxyhexyl acrylate: 11 parts,

[0092] Tetrahydrofuran acrylate: 8 parts, reactive silicone polyether acrylate: 3 parts (TEGO I200N),

[0093] Photoinitiator: 2.2 parts (184 photoinitiator),

[0094] Leveling agent: 0.6 parts (BYK333 silicone leveling agent),

[0095] Solvent: 30 parts (mixture of ethyl acetate and toluene).

[0096] Embodiment 9:

[0097] Bicycloheptyl polyurethane acrylate: 26 parts (Mitsubishi Chemical AUR-7X04),

[0098] Adamantyl polyurethane acrylate: 20 parts (DSM NeoRad A-350),

[0099] Polyhydroxy neopentyl glycol acetal acrylate: 13 parts (Mitsubishi Chemical NPA-205),

[0100] Hydroxyethyl acrylate: 10 parts,

[0101] Tetrahydrofuran acrylate: 7 parts,

[0102] Reactive silicone polyether acrylate: 4 parts (TEGO I200N),

[0103] Photoinitiator: 1.7 parts (184 photoinitiator),

[0104] Leveling agent: 0.5 parts (BYK333 silicone leveling agent),

[0105] Solvent: 25 parts (mixture of ethyl acetate and toluene).

[0106] Example 10

[0107] Biscycloheptyl polyurethane acrylate: 25 parts (DSM NeoRad R-4506),

[0108] Adamantyl polyurethane acrylate: 18 parts (Bayer Material Science Desmolux A-200), hydroxy neopentyl glycol acetal acrylate: 15 parts (Bayer Material Science Desmolux NP-400), hydroxyhexyl acrylate: 12 parts,

[0109] Tetrahydrofuran acrylate: 6 parts,

[0110] Reactive silicone polyether acrylate: 3 parts (TEGO I200N),

[0111] Photoinitiator: 2.3 parts (184 photoinitiator),

[0112] Leveling agent: 0.8 parts (BYK333 silicone leveling agent),

[0113] Solvent: 20 parts (mixture of ethyl acetate and toluene).

[0114] In summary, the performance test results of the above-mentioned various embodiment ratios are shown in Table 1:

[0115] Example Backend maturation requirements Anti-adhesion effect Self-repairing water drop angle (°) Copper brush resistance effect (times) 1 No need excellent 100 300 2 No need good 105 350 3 No need excellent 100 400 4 No need excellent 110 300 5 No need good 100 450 6 No need excellent 105 400 7 No need excellent 110 300 8 No need excellent 100 500 9 No need excellent 105 450 10 No need excellent 110 350

[0116] 1. The anti-adhesion performance test adopts international standards ISO 15359 and ASTM D3359.

[0117] 2. The water drop angle test adopts ASTM D7334 or ISO 15989 standard.

[0118] 3. The abrasion resistance test adopts ASTM D4060 (Taber abrasion resistance test) or ISO 7784-2 standard.

[0119] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-repairing coating, characterized in that: In parts by weight:

2. A self-repairing coating according to claim 1, characterized in that: The dicycloheptyl polyurethane acrylate is one or more of Mitsubishi Chemical AUR-7X03, Mitsubishi Chemical AUR-7X04, DSM NeoRad R-4505, DSM NeoRad R-4506, Bayer MaterialScience Desmolux D-100, Bayer MaterialScience Desmolux D-101, Arkema SartomerSR9004, and Arkema Sartomer SR9005.

3. A self-repairing coating according to claim 1, characterized in that: The adamantyl polyurethane acrylate is one or more of Mitsubishi Chemical AD-102, DSM NeoRad A-350, Bayer MaterialScience Desmolux A-200, Arkema SartomerSA510, Evonik Industries TEGO Rad 2600, BASF Laromer GA 9020, Shin-Etsu Chemical KBE-810, and Dow Chemical XUS35700.

4. A self-repairing coating according to claim 1, characterized in that: The polyol neopentyl glycol acetal acrylate is one or more of Mitsubishi Chemical NPA-205, DSM NeoRad NP-600, Bayer MaterialScience Desmolux NP-400, Arkema Sartomer NP510, Evonik Industries TEGO Rad NP2700, BASF Laromer NP9025, Shin-Etsu Chemical KBE-NP320, and Dow Chemical XUS NP35800.

5. A method for preparing a self-repairing coating according to claims 1-4, characterized in that: The following steps are involved: (1) 20-30 parts by weight of dicycloheptyl polyurethane acrylate, 15-25 parts by weight of adamantyl polyurethane acrylate and 10-20 parts by weight of polyvinyl neopentyl glycol acetal acrylate are sequentially added into a closed reaction kettle, and then 10-15 parts by weight of butyl acrylate and 1-5 parts by weight of reactive silicone polyether acrylate are sequentially added, and the mixture is uniformly mixed by high-speed ultrasonic dispersion and stirring; (2) Slowly add 1-3 parts of photoinitiator and 0.5-1 parts of leveling agent while stirring continuously and continue to stir until evenly dispersed; (3) slowly adding 20-30 parts of solvent to the stirred mixture and stirring at a low speed until the solution is free of impurities; (4) using a coating device to evenly coat the mixture on the surface of the substrate, heating it to 60-80° C. for thermal curing, and volatilizing the solvent to form a preliminary coating; (5) Irradiate under a high-pressure UV lamp to completely cure the coating to obtain a self-healing coating.

6. A method for preparing a self-repairing coating according to claim 5, characterized in that: The photoinitiator is 184 photoinitiator.

7. A method for preparing a self-repairing coating according to claim 5, characterized in that: The leveling agent is BYK333 organic silicone leveling agent.

8. A method for preparing a self-repairing coating according to claim 5, characterized in that: The solvent is a mixed solvent of ethyl acetate and toluene.

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