Microencapsulated self-repairing superhydrophobic coating layer and preparation method thereof

A super-hydrophobic coating and microcapsule technology, applied in the directions of microcapsule preparation, microsphere preparation, coating, etc., can solve the problems of affecting the scope of use, weak coating adhesion, etc., and reduce the loss of low surface energy components. and the effect of roughness reduction and time reduction

Active Publication Date: 2019-07-05
珠海智仁科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of the coating is simple, the base material is widely applicable, and the repair can be realized at room temperature, but the bonding force between the coatings is not strong, which affects its application range to a certain extent

Method used

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  • Microencapsulated self-repairing superhydrophobic coating layer and preparation method thereof
  • Microencapsulated self-repairing superhydrophobic coating layer and preparation method thereof
  • Microencapsulated self-repairing superhydrophobic coating layer and preparation method thereof

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[0028] The embodiment of the present invention also provides a preparation method of a microcapsule type self-repairing superhydrophobic coating, comprising the steps of: weighing the polymer matrix and the microcapsules coated with fluorosilane by weight percentage, mixing the polymer matrix and the microcapsules The capsules are mixed into a suspension, and then the suspension is coated on the substrate, cured at 25-40°C for 1-3 hours, and then cured at 70-90°C for 1-3 hours to obtain a finished product.

[0029] In the present invention, when the suspension is prepared, the polymer matrix and the microcapsules are dissolved in acetone, and a uniform suspension is formed through ultrasonic dispersion and mixing.

[0030] In some preferred embodiments of the present invention, the substrate coated with the suspension solution is cured at 40° C. for 1 hour and then cured at 80° C. for 2 hours to obtain a finished product.

[0031] In the present invention, the microcapsules co...

Embodiment 1

[0041] This embodiment provides a method for preparing microcapsules coated with fluorosilane, comprising the following steps:

[0042] (1) Add 0.015mol / L melamine, 0.045mol / L formaldehyde with a mass fraction of 37%, and 15ml deionized water into a three-necked reaction flask, stir and mix evenly, adjust the pH of the mixture to 8.5, and heat the mixture at 70°C Reaction 45min, obtains clear and transparent melamine-formaldehyde resin prepolymer;

[0043] (2) Put 6mL tridecafluorooctyltriethoxysilane (G617 for short), 0.1g potassium perfluorooctane sulfonate, 0.1g styrene maleic anhydride sodium salt, 3mL polyethylene glycol and 45ml deionized water in Stir and mix evenly at 350rpm to obtain an emulsion, mix the melamine-formaldehyde resin prepolymer, the emulsion, and 0.15g resorcinol, continue to stir at 350rpm for 5min, and dilute the mixture with 1mol / L citric acid monohydrate The pH of the solution was adjusted to 3, and the mixture was reacted at 55°C for 1 hour. After...

Embodiment 2

[0046] This embodiment provides a method for preparing microcapsules coated with fluorosilane, comprising the following steps:

[0047] (1) Add 0.015mol / L melamine, 0.045mol / L formaldehyde with a mass fraction of 37%, and 15ml deionized water into a three-necked reaction flask, stir and mix evenly, adjust the pH of the mixture to 8, and set the temperature at 60°C Reaction 60min, obtains clear and transparent melamine-formaldehyde resin prepolymer;

[0048] (2) Stir and mix 6mL tridecafluorooctyltriethoxysilane, 0.1g potassium perfluorooctane sulfonate, 0.1g styrene maleic anhydride sodium salt, 3mL polyethylene glycol and 45ml deionized water at 400rpm Evenly, to obtain an emulsion, mix the melamine-formaldehyde resin prepolymer, the emulsion and 0.15g resorcinol, continue stirring at 400rpm for 5min, and then adjust the pH of the mixture to 2. The mixture was reacted at 50°C for 1 hour. After the reaction was completed, it was naturally cooled, separated, screened, and free...

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Abstract

The present invention discloses a microencapsulated self-repairing superhydrophobic coating layer. The superhydrophobic coating layer comprises 35-51 wt% of a polymer matrix and 49-65 wt% of a microcapsule coated with fluorosilane. The superhydrophobic coating layer has a good hydrophobic property, and the fluorosilane stored in the microcapsule migrates to the surface of the capsule under the driving of surface free energy to provide a low surface energy substance, and is released from the capsule after the capsule is worn and damaged in order to repair the damaged superhydrophobic surface; the microcapsules and the polymer matrix blended to form an "integrated" self-similar structure, and the fresh surface exposed after the rough structure of the surface layer is damaged still has a highroughness, so the loss of low surface energy components and the reduction of surface roughness due to chemical corrosion or external force wearing are greatly reduced; and the damaged superhydrophobic surface of the coating layer is repaired by the synergistic action of the microcapsule and the polymer matrix. The invention also provides a preparation method of the microencapsulated self-repairing superhydrophobic coating layer.

Description

technical field [0001] The invention belongs to the technical field of superhydrophobic materials, and in particular relates to a microcapsule self-repairing superhydrophobic coating and a preparation method thereof. Background technique [0002] The superhydrophobic surface (contact angle greater than 150° and rolling angle less than 10°) has excellent performance, so it has broad application prospects in many fields, such as self-cleaning, anti-corrosion, anti-icing, drag reduction, and antifouling. However, the durability of artificial superhydrophobic surfaces is not good during actual use, and they are prone to lose superhydrophobic properties due to physical damage such as scratches and abrasions, which greatly limits the application of superhydrophobic materials. Endowing super-hydrophobic materials with self-healing properties, spontaneously starting the repair "program" when the material is damaged, making up for the adverse effects of damage on the material structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D7/63C09D7/65C08G12/32B01J13/14D21H19/24D21H19/26
CPCB01J13/14C08G12/32C09D175/04C09D7/63C09D7/65D21H19/24D21H19/26C08L61/28C08K5/5419
Inventor 姚丽周莹肖绘
Owner 珠海智仁科技有限公司
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