阅读说明：本技术 一种超疏水涂料及其制备方法和应用 (Super-hydrophobic coating and preparation method and application thereof ) 是由 余尚辰 于 2019-08-20 设计创作，主要内容包括：本发明公开了一种超疏水涂料及其制备方法和应用,本发明通过疏水性树脂、疏水性树脂的良溶剂、有机硅烷、聚苯乙烯、光引发剂、交联剂、固化剂等原料之间的交联固化作用,经过高速分散、水浴反应等步骤制得具有超疏水效果额的涂料；本发明制备工艺简单,反应条件温和,所制备的超疏水涂层具有良好的结合力和耐磨性,具有广泛的生产、生活应用前景。(The invention discloses a super-hydrophobic coating and a preparation method and application thereof.A coating with super-hydrophobic effect is prepared by the steps of high-speed dispersion, water bath reaction and the like through the crosslinking and curing actions among raw materials such as hydrophobic resin, good solvent of the hydrophobic resin, organosilane, polystyrene, photoinitiator, crosslinking agent, curing agent and the like; the preparation method is simple in preparation process and mild in reaction conditions, and the prepared super-hydrophobic coating has good binding force and wear resistance and has wide production and life application prospects.)

1. The super-hydrophobic coating is characterized by comprising the following raw materials in parts by weight: 10-25 parts of hydrophobic resin, 20-30 parts of good solvent of the hydrophobic resin, 1-10 parts of organosilane, 5-10 parts of polystyrene, 1-5 parts of photoinitiator, 2-8 parts of cross-linking agent and 5-10 parts of curing agent.

2. The super-hydrophobic paint as claimed in claim 1, wherein the hydrophobic resin is composed of one or more of polytetrafluoroethylene resin, fluorocarbon resin, polyacrylic resin and fluorinated modified polyurethane.

3. The super-hydrophobic paint as claimed in claim 1, wherein the good solvent of hydrophobic resin is one or more selected from ethanol, tetrahydrofuran, acetone, N-dimethylformamide and N-methylpyrrolidone.

4. The superhydrophobic coating of claim 1, wherein the organosilane is one or more of tetramethylsilane, heptadecafluorodecyltriethoxysilane, silane, and triethylsilane.

5. The superhydrophobic coating of claim 1, wherein the photoinitiator is one or more of diphenylethanone, α -dimethoxy- α -phenylacetophenone, thiopropoxy thioxanthone, isopropyl thioxanthone, and bis-benzoylphenylphosphine oxide.

6. The superhydrophobic coating of claim 1, wherein the cross-linking agent is vinyltriethoxysilane.

7. The superhydrophobic coating of claim 1, wherein the curing agent comprises one or more of polyisocyanate, methyltriethoxysilane, propyltriethoxysilane, octyltrimethoxysilane, and gamma-methacryloyloxytrimethoxysilane.

8. The preparation method of the super-hydrophobic coating is characterized by comprising the following steps:

(1) weighing the raw materials according to any one of the parts by weight of claims 1-7, and dissolving the weighed hydrophobic resin and curing agent in a good solvent to obtain a hydrophobic resin solution;

(2) adding organosilane, polystyrene, a photoinitiator and a crosslinking agent into a hydrophobic resin solution, and dispersing at a high speed for 40-60min under the condition of 15000-25000r/min to obtain a uniformly mixed suspension;

(3) and (3) putting the suspension obtained in the step (2) into a closed container, heating in a constant-temperature water bath kettle at the temperature of 20-45 ℃, starting magnetic stirring under the protection of nitrogen, fully reacting for 2-12 hours, pouring out reactants formed in the container, and standing for 10-80min at normal temperature to obtain the super-hydrophobic coating.

9. A preparation method of a super-hydrophobic coating is characterized by comprising the following steps: soaking the cleaned substrate with the super-hydrophobic coating obtained in the step (3) in the claim 8 for 5-20min, and drying and curing at 70-150 ℃ for 20-70min to form a transparent super-hydrophobic coating on the substrate.

10. The method for preparing the superhydrophobic coating according to claim 9, wherein the base material is textile, wooden material, paper, metal or cloth.

Technical Field

The invention relates to the technical field of hydrophobic coatings, in particular to a super-hydrophobic coating and a preparation method and application thereof.

Background

The super-hydrophobic state is defined as a super-wetting state that the static contact angle of a small water drop on a hydrophobic surface is more than 150 degrees, and the rolling angle is less than 10 degrees. The lotus leaf surface, the water strider leg, the butterfly wing, the rose petal and the like in nature have excellent super-hydrophobicity due to unique micron/nanometer grading coarse structure and chemical composition on the surfaces, so that the lotus leaf surface, the water strider leg, the butterfly wing, the rose petal and the like have survival advantages under certain environmental conditions. Based on the bionic theory, the preparation research of the super-hydrophobic surface is a great hot spot recently. The super-wetting characteristic of the super-hydrophobic surface enables the super-hydrophobic material to have the functions of self-cleaning, drag reduction, water prevention, fog prevention, icing prevention, micro-fluidic control and the like, and the super-hydrophobic material has wide application prospects in the fields of aviation, navigation, energy, buildings, electronics, corrosion prevention, sensors, fluid transportation and the like.

The characteristics of superhydrophobicity are determined by the chemical composition and roughness of the material surface, and low surface free energy and proper roughness are two indispensable factors for preparing the superhydrophobic surface. Based on this theory, researchers have developed many methods to prepare superhydrophobic surfaces, which can be largely classified into two categories. One is a "top-down" method, including plasma etching, wet etching, machining, imprinting, laser ablation, etc.; the other is a "bottom-up" method, which includes electrostatic spinning, electrochemical oxidation, chemical oxidation, hydrothermal synthesis, sol-gel, spray coating, and the like. However, most of the existing methods have the limitations of expensive production equipment, high raw material price, long preparation process, complex process and the like, and the conversion from laboratory preparation to large-scale production application is difficult to realize.

Currently, researchers have developed various methods for preparing superhydrophobic coatings, such as: vapor deposition, stencil, surface etching, self-assembly, and the like; however, these methods have their own advantages and disadvantages. When the super-hydrophobic coating is prepared, equipment used by a vapor deposition method is expensive, the template method is low in preparation efficiency, the etching method is poor in treatment effect stability, the self-assembly method is complex in process, and part of preparation methods need high-temperature curing treatment and the like. In addition, the super-hydrophobic coatings prepared by the methods have poor mechanical stability and easily lose the super-hydrophobic property when being scratched. The above disadvantages limit the application of superhydrophobic coatings to some extent.

The research on the super-hydrophobic coating with mild condition, simple process, excellent super-hydrophobic effect and good mechanical stability is a technical problem which needs to be solved urgently by technical personnel in the field.

Disclosure of Invention

In view of the above, the invention provides a super-hydrophobic coating, and a preparation method and an application thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

the super-hydrophobic coating is prepared from the following raw materials in parts by weight: 10-25 parts of hydrophobic resin, 20-30 parts of good solvent of the hydrophobic resin, 1-10 parts of organosilane, 5-10 parts of polystyrene, 1-5 parts of photoinitiator, 2-8 parts of cross-linking agent and 5-10 parts of curing agent.

Further, the hydrophobic resin is composed of one or more of polytetrafluoroethylene resin, fluorocarbon resin, polyacrylic resin and fluorinated modified polyurethane.

Further, the good solvent for the hydrophobic resin is composed of one or more of ethanol, tetrahydrofuran, acetone, N-dimethylformamide and N-methylpyrrolidone.

The hydrophobic resin adopted by the invention can enable water to be gathered into a group so as to fully disperse water molecules, the water molecules are arranged in the hydrophobic resin in a more orderly manner and are at a higher energy level than the water molecules when being completely surrounded by other water molecules, and the water molecules pass through the interaction contact surface of two nonpolar chains; thereby increasing the static contact angle and decreasing the roll angle.

Further, the organosilane is one or more of tetramethylsilane, heptadecafluorodecyltriethoxysilane, monosilane, and triethylsilane.

The organic silane has good nonpolar property, can repel water molecules, and further assists the hydrophobic resin adopted by the invention to play a super-hydrophobic role.

Further, the photoinitiator is composed of one or more of diphenylethanone, alpha-dimethoxy-alpha-phenylacetophenone, thiopropoxy thioxanthone, isopropyl thioxanthone and bis-benzoylphenylphosphine oxide.

The further beneficial effect is that the photoinitiator is adopted to enable the raw materials to generate a large amount of free radicals and oxygen ions, so that the raw materials can be initiated to carry out crosslinking and curing reaction.

Further, the crosslinking agent is vinyltriethoxysilane.

Further, the curing agent is composed of one or more of polyisocyanate, methyltriethoxysilane, propyltriethoxysilane, octyltrimethoxysilane and gamma-methacryloyloxytrimethoxysilane.

The further beneficial effect is that the curing agent adopted by the invention can form a crosslinking reaction through the action of the photoinitiator on the hydrophobic resin, so that the coating can be dried and cured in a short time when in use, a stable super-hydrophobic coating is formed, and the hydrophobic performance of the hydrophobic coating is effectively improved.

The invention also provides a preparation method of the super-hydrophobic coating, which comprises the following steps:

(1) weighing the raw materials in parts by weight, and dissolving the weighed hydrophobic resin and curing agent in a good solvent to obtain a hydrophobic resin solution;

(2) adding organosilane, polystyrene, a photoinitiator and a crosslinking agent into a hydrophobic resin solution, and dispersing at a high speed for 40-60min under the condition of 15000-25000r/min to obtain a uniformly mixed suspension;

(3) and (3) putting the suspension obtained in the step (2) into a closed container, heating in a constant-temperature water bath kettle at the temperature of 20-45 ℃, starting magnetic stirring under the protection of nitrogen, fully reacting for 2-12 hours, pouring out reactants formed in the container, and standing for 10-80min at normal temperature to obtain the super-hydrophobic coating.

Further, the invention also provides a preparation method of the super-hydrophobic coating containing the super-hydrophobic coating, which comprises the following steps: and soaking the cleaned substrate for 5-20min by using the super-hydrophobic coating, and drying and curing at 70-150 ℃ for 20-70min to form a transparent super-hydrophobic coating on the substrate.

Furthermore, the substrate material is textile, wooden material, paper, metal or cloth.

The super-hydrophobic coating has the advantages that the super-hydrophobic coating can be applied to various fields, particularly has excellent hydrophobic performance on textiles and cloth, and a transparent super-hydrophobic coating is formed on a substrate by soaking, drying and other operations, so that an excellent waterproof and hydrophobic function is achieved.

Compared with the prior art, the invention has the beneficial effects that: the super-hydrophobic coating provided by the invention has the advantages that the raw materials are cheap and easy to obtain, the preparation process conditions are simple, various substrates can be treated through simple soaking, and then the super-hydrophobic coating is obtained through curing; the contact angles of water on the surface of the super-hydrophobic coating are all larger than about 155 degrees; meanwhile, the coating thickness of the substrate material can be increased in a repeated soaking-curing mode, and the durability of the super-hydrophobic coating is improved. Compared with benzene and other organic solvents used in traditional coatings, the organic solvent selected by the invention has low toxicity and little environmental pollution, and greatly reduces the influence on the environment. The coating formed by the super-hydrophobic coating prepared by the invention has good wear resistance, strong self-cleaning capability, good flexibility, good combination with a base material and wide production and living application prospects.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.