TWI454516B - Removable hydrophobic composition, removable hydrophobic coating layer and fabrication method thereof - Google Patents

Description

Removable hydrophobic composition, removable hydrophobic coating and preparation method thereof

The present invention relates to hydrophobic compositions, hydrophobic coatings, and methods of making the same, and more particularly to removable hydrophobic compositions, removable hydrophobic coatings, and methods of making the same.

Many daily consumer products, portable electronic products, transportation equipment, musical instruments, sports equipment, porcelain or decorative art, etc., need to be hydrophobically protected. However, it is currently known that the formation method of the hydrophobic protective film is too professional and is not suitable for general human operation. For example, a heat curing or ultraviolet curing process is required. Alternatively, the processing process involves surface chemical treatment or etching to produce a rough surface structure having hydrophobic properties. Therefore, products with a hydrophobic surface usually have to be disposed of by the factory before they are handed over to consumers. Hydrophobic protective layers are difficult to manufacture by the average consumer.

In addition, when the hydrophobic protective layer is used for a long period of time, the protective layer is degraded so that its hydrophobic effect is gradually lost, so it is necessary to replace the new hydrophobic protective layer. However, the hydrophobic protective layer prepared by the factory is difficult to remove directly. Generally, it needs to be removed by mechanical methods such as mechanical grinding or heating and melting, which requires not only professional knowledge and equipment, but also easy implementation. Causes serious damage to the substrate.

Some coatings used to form hydrophobic coatings contain a fluorine component because the fluoride itself has low surface energy properties to achieve a hydrophobic effect. However, the European Parliament currently voted to adopt the latest amendments to the EU Directive on Hazardous Substances (76/769/EEC), which strictly limits the use of fluoride, including perfluoro-octanoic acid (PFOA), perfluorooctane sulfonate. Use of derivatives such as (Perfluorooctane Sulfonate, PFOS). Among them, PFOS is a kind of perfluorinated chemical, which has good thermal stability, is not easily damaged in the environment, and is resistant to water and oil. Another common perfluorinated chemical is perfluorooctanoic acid (PFOA) and its salts. Applications for PFOA and its derivatives include surface treatment of household products (such as non-stick cookware), convenience food packaging, anti-stick material fibers, and fire-retardant foam. Perfluorinated chemicals are concentrated in the adipose tissue of living organisms and are harmful to humans and wildlife. The European Parliament has been asked to continue to conduct risk assessments, find safer alternatives, and define reductions, including restrictions on sales and use.

For this consideration, the hydrophobic protective layer can be formed by forming a rough microstructure on the surface of the substrate in combination with a non-fluorine-based low surface energy material. Non-fluorinated hydrophobically modified materials have been disclosed in U.S. Patent No. 2,786,042, the use of a carbon number of 1 to 20 decanes to modify the surface of a microstructured cerium oxide to obtain a hydrophobic powder. Body material. U.S. Patent No. 5,136,074 describes the use of a decylation modifier to modify a powder material whereby a stable modified powder is obtained, wherein the modifier comprises trimethylchlorosilane, t-butyldimethylchlorosilane. U.S. Patent No. 5,651,921 discloses the use of an organic compound to replace an OH group on the surface of a cerium-modified cerium oxide material, thereby forming a hydrophobic material, wherein the modifying components used include organic group-substituted halosilanes, organic group-substituted alkoxysilanes, and organic group-substituted silazanes. With hydrolyzates. U.S. Patent No. 6,025,455 discloses the use of alkyl functional groups to modify the OH groups on the surface of cerium oxide materials, including disiloxane and monosiloxane. This document further describes the use of a solvent to form a coating for forming a hydrophobic coating which can be formed by the step of coating and curing the coating. U.S. Patent No. 6,767,984 discloses the use of a polymeric material grafted with decane for the purpose of upgrading, thereby forming a formulation of a hydrophobic protective coating applied to the surface of a vehicle. The Western 2006 Journal of Applied Surface Science, Vol. 253, pp. 2217-2221, describes the modification of cerium oxide with Hexamethyldisilazane to obtain a surface having hydrophobic properties. The Journal of Applied Science Science, Vol. 255, pp. 3600-3604, describes the modification of the surface of cerium oxide with a Trimethylethoxysialne oxane compound to provide a transparent and hydrophobic coating. The Journal of Colloid and Interface Science, Vol. 332, pp. 484-490, discloses the use of Hexamethyldisilazane with Methyltrimethoxysilane to form a long-lasting hydrophobic coating that can withstand a one-month high humidity environment.

International Patent No. WO 2008/153687 discloses the use of a low surface energy material to modify the surface of a powder, thereby making a spray coating formulation which can be applied directly to the surface of the substrate to form a hydrophobic coating. However, this hydrophobic coating has problems of insufficient adhesion strength and poor stability. Taiwan Patent No. I310779 discloses the use of an epoxy resin as an adhesive between a hydrophobic powder and a surface of a substrate to enhance the adhesion of the hydrophobic coating to the substrate, but the hydrophobic coating does not Easily removed. Taiwan Patent Application No. 96121473 discloses the use of polyacrylate as an adhesion agent for a highly transparent, highly weather-resistant antifouling and waterproof coating. Hydrophobic coatings formed using the above coatings are difficult to remove and typically require the use of specialized knowledge or equipment, for example, mechanical or abrasive melting.

There are also some examples in which a hydrophobic protective layer is formed using a wax having a hydrophobic property. However, such a coating is liable to suffer from the problem of uneven mixing of the powder, and the powder may not exhibit its own hydrophobic character because it is completely covered with the wax, and thus the hydrophobic effect of the formed hydrophobic coating is greatly reduced.

According to one aspect of the invention, a removable hydrophobic composition is provided. The removable hydrophobic composition includes 0.1 to 50 parts by weight of nanoparticles, 0.1 to 5 parts by weight of an adhesion regulator or an adhesion inhibitor, 100 parts by weight of a solvent, and 0.1 to 50 parts by weight of a polymer compound. The particle size of the nanoparticles is less than 100 nm. The surface of the nanoparticle is modified with a decane compound;

According to another aspect of the present invention, there is provided a process for the preparation of a removable hydrophobic coating comprising the following steps. The above removable hydrophobic combination is provided. A removable hydrophobic combination is applied to the surface of the substrate. After the solvent in the removable hydrophobic combination is volatilized, the removable hydrophobic combination forms a removable hydrophobic coating on the surface of the substrate.

According to still another aspect of the present invention, there is provided a removable hydrophobic coating formed by the above preparation method.

The present invention provides a removable hydrophobic composition, a removable hydrophobic coating, and a method of making the same. The removable hydrophobic composition and the formed removable hydrophobic coating are free of the hazardous substance fluorocarbon and have an excellent hydrophobic effect. The following description of the examples and the accompanying drawings is intended to be understood by those of ordinary skill in the art.

Removable hydrophobic composition

The removable hydrophobic composition comprises (a) 0.1 to 50 parts by weight of nanoparticle having a particle diameter of less than 100 nm, and the surface of the nanoparticle is modified with a decane compound; (b) 0.1 to 5 parts by weight An adhesion adjuster or an adhesion inhibitor; (c) 100 parts by weight of a solvent; and (d) 0.1 to 50 parts by weight of a polymer compound.

In an embodiment of the invention, the nanoparticles comprise titanium oxide, zinc oxide, aluminum oxide, cerium oxide, mica, derivatives or combinations of the above materials. The decane compound includes hexamethyldiazepine, dimethyldichloromethane, trimethoxyoctyldecane, octamethylcyclotetraoxane, ethoxy decane series components, polydimethyl siloxane, A tetramethyltetravinylcyclotetramethylene oxide series component, a derivative or a combination of the above materials. The decane compound can be modified in a chemically bonded manner (for example, by hydrolysis to form a bond with the nanoparticle) to modify the surface properties of the nanoparticle, so that the surface of the nanoparticle has better hydrophobic properties.

Nanoparticles whose surface has been modified by decane compounds can be purchased directly, purchased as semi-finished products or processed from raw materials. Preparation methods of nano particles include sol-gel synthesis, gas phase reaction, hydro-thermal, deposition, physical pulverization, mechanical milling, chemical vapor deposition , microemulsion method, electrochemical method, and the like. The sol-gel synthesis method refers to a method in which a metal compound is solidified by a solution, a sol or a gel, and then subjected to a low-temperature heat treatment to form a nanoparticle, which has the advantages of a large variety of reactants, uniform product particles, and easy process. control. Gas phase reaction is one of the most important synthetic technologies at present. The basic principle is that when atoms or molecules in the gas phase are supersaturated, they will nucleate and form a solid phase or a liquid phase. If the cooling rate is controlled during homogeneous nucleation in the gas phase, it can be gradually grown into pure metal, ceramic or composite nano particles; if it is slowly cooled on a solid substrate to form a core-growth, it can grow into a thin film. Nano-grade materials such as whiskers or carbon tubes. The gas phase reaction method has the advantage of being clean and the particle size of the nanoparticles is easily controlled. For research purposes or to explore applications, it is necessary to have nano particles with certain characteristics. At this time, it is suitable for forming nano particles of metals, alloys, ceramics, composites, and organic compounds by vapor phase evaporation. After the preparation of the nanoparticle is completed, the cerium compound is chemically bonded to the nanoparticle, thereby producing a nanoparticle whose surface is modified by the decane compound.

The solvent includes an alkane, an aromatic, an alcohol, a ketone, an ester, an ester derivative or a combination thereof. For example, the solvent may include ethanol, isopropanol, butane, heptane, hexane, acetone, methyl ethyl ketone, methyl ethyl ketone, toluene, xylene, ethyl acetate, butyl acetate, heteroester, the above A derivative or combination of materials. The use of a suitable solvent enables the dispersion of the nanoparticles in the coating to be good, and the nanoparticles are stably suspended in the coating, are less likely to aggregate, and do not settle quickly. The volatility of the solvent also helps the nanoparticle dispersed in the coating to be evenly arranged on the surface of the substrate to enhance the hydrophobic effect of the hydrophobic coating.

The function of the adhesion adjusting agent or the adhesion inhibitor is to make the removable hydrophobic composition have appropriate adhesion, and also to inhibit the adhesiveness of the polymer coating to have a removable property. The adhesion modifier used in the examples can also be used as a binder to enhance the adhesion between the nanoparticles and the surface of the substrate. The adhesion adjusting agent includes petroleum spirit wax, Brazilian wax, beeswax, polyethylene wax, derivatives or combinations of the above materials. The polymer compound includes polyethylene, polypropylene, polyvinyl acetate, acrylic resin, polyvinyl chloride, polystyrene, ruthenium rubber resin, epoxy resin, polyurethane resin, derivatives or combinations of the above materials. Since the adhesion regulator or the adhesion inhibitor (wax) in the coating of the embodiment of the invention only accounts for a small proportion, the viscous adhesion regulator does not seriously affect the dispersion of the nanoparticles, nor does it The nanoparticle is entirely coated, so that the nanoparticle can still be uniformly mixed in the coating and exhibit its own hydrophobic properties. In addition, the use of an adhesion modifier allows the formed hydrophobic coating to have easily removable properties.

According to some embodiments of the invention, the removable hydrophobic composition may further comprise a polymeric plasticity adjusting aid. The polymer plasticity adjusting aid may include polyethylene glycol, polytetramethyl ether glycol, polycaprolactone polyol, dioctyl phthalate, triacetin, isobutyl methacrylate, the above A derivative or combination of materials.

Removable hydrophobic coating and preparation method thereof

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart showing the preparation of a removable hydrophobic coating according to an embodiment of the present invention. The preparation method of the removable hydrophobic coating of the embodiment comprises: (a) providing the above-mentioned removable hydrophobic composition (step S101); (b) applying the removable hydrophobic composition to the base On the surface of the material (step S103); and (c) after the solvent in the removable hydrophobic composition is volatilized, the removable hydrophobic composition forms a removable hydrophobicity on the surface of the substrate. Coating (step S105).

In step S103, the removable hydrophobic composition can be applied to the surface of the substrate by various coating methods, such as spin coating, dip coating, spray coating, smearing, knife coating, brush coating, and roller coating. Wait. Substrates suitable for coating a removable hydrophobic composition to form a removable hydrophobic coating on a surface include: glass, ceramic, stone, plastic, metal or macromolecule, etc. Other materials and their composites may also be suitable. Since the removable hydrophobic composition of the present embodiment can be coated with a wide variety of materials, the removable hydrophobic coating also has a hydrophobic effect, and many daily necessities, portable electronic products, and transportation. Removable hydrophobic compositions of the examples may be used for appliances, musical instruments, sports equipment, porcelain or decorative arts, such as leather bags, leather care for leather shoes, portable electronic case or screen scratch protection, vehicles Surface cleaning protection treatment, wear-resistant and hydrophobic treatment of tile surface, gloss protection of jewelry surface, no anti-fingerprint surface treatment on the surface of musical instruments, waterproof coating treatment of sports equipment surface, and many other applications.

In one embodiment, after the removable hydrophobic composition is coated on the surface of the substrate in step S105, it can be naturally air-dried at room temperature until the solvent is evaporated, thereby completing the embodiment. Removed hydrophobic coating. In addition, simple convection tools such as fans, fans, and hair dryers can be used to accelerate drying. Please note that the removable hydrophobic composition of this example can be prepared by simply using a simple convection tool at room temperature without the use of special or professional heating or UV curing. The equipment is easy to prepare and easy to use, so it can expand the sales of the product.

The method for preparing the removable hydrophobic coating of the embodiment of the present invention may further comprise the step S107 of removing the removable hydrophobic coating. After the removable hydrophobic coating has been degraded due to prolonged use, the user may have a need to replace the removable hydrophobic coating. The removable hydrophobic composition of the embodiment of the present invention is added with a polymer compound and a small amount of an adhesion regulator or an adhesion inhibitor (wax), so that the removable hydrophobic coating formed is removable. The coating layer is similar in appearance to the transparent wrap film which is in close contact with the surface of the substrate. The removable hydrophobic coating does not require an intense method and can be easily removed from the surface of the substrate by means of tearing, rinsing, brushing, etc., thereby minimizing damage to the surface of the substrate. . After removal of the removable hydrophobic coating, another removable hydrophobic composition can be applied to the surface of the substrate to form another entirely new removable hydrophobic coating. According to the above, after the functional hydrophobic coating is degraded, the user can replace the removable hydrophobic coating on the surface of the substrate by itself in a very simple manner, wherein the old removable can be removed. The hydrophobic coating process hardly causes damage to the surface of the substrate.

Examples and comparative examples

The conditions and results of several sets of comparative examples and embodiments of the present invention are set forth below to demonstrate the advantages of the present invention.

The removable hydrophobic coating of the first embodiment is prepared by first adding 0.5 g of cerium oxide nanoparticles (particle size 7 nm) modified with hexamethyldioxane, 0.5 g of petroleum spirit wax and 100 ml of acetic acid. The butyl ester was mixed and heated to 60 ° C to be homogeneously dispersed, and then 0.5 g of PMMA was added, and stirred at room temperature until dissolved, thereby obtaining a removable hydrophobic composition. The obtained removable hydrophobic composition is directly charged into a pneumatic spray can, and after the surface of the glass fiber substrate is sprayed, the solvent is completely dried to obtain a removable hydrophobic coating.

The removable hydrophobic coating of Example 2 was prepared in a similar manner to Example 1, except that the petroleum wax was replaced with a Brazilian wax.

The preparation of the hydrophobic coating of Comparative Examples 1 to 2 was similar to that of Example 1, except that the contents of the coating were changed. Refer to Table 1 for the detailed contents of the coatings of the comparative examples.

Embodiments of the present invention add a small amount of an adhesion modifier or an adhesion inhibitor (wax) to the removable hydrophobic composition, which affects the adhesion of the adhesive to the surface. Comparing the results of the above Examples 1 to 2 and Comparative Examples 1 to 2, it was found that the coating of the comparative example did not use wax, and the formed hydrophobic coating adhered strongly to the surface of the substrate and must be removed with drasticity. The technique can be removed. However, the removable hydrophobic composition of the embodiment of the present invention uses a small amount of an adhesion regulator or an adhesion inhibitor (wax), and the formed hydrophobic coating can be wiped only by a dry paper towel. Remove without the use of solvents or other drastic means. Furthermore, the hydrophobic effect of the removable hydrophobic coating of the examples was significantly better than the hydrophobic coating of the comparative examples.

Table 2 shows the results of Comparative Example 3 to Comparative Example 6. Comparative Example 3 to Comparative Example 6 did not use a polymer compound, and there was no chemical bonding reaction between the surface-modified nanoparticle and the added adhesion regulator. The hydrophobic coatings of Comparative Examples 3 to 6 were prepared by subjecting 0.5 g of cerium oxide nanoparticles (particle size 7 nm) modified with hexamethyldioxane to 0.5 g of petroleum spirit wax and 100 ml of isopropanol. The mixture was homogeneously dispersed at room temperature, whereby a hydrophobic composition was obtained. Then, the obtained hydrophobic composition is directly charged into a pneumatic spray can, and after spraying the surface of the glass fiber board substrate, the solvent is completely dried to obtain a hydrophobic coating.

From Comparative Example 4, the modified nanoparticles retained their hydrophobic character after the wax was added. From the results of Comparative Example 6, it is understood that the wax itself has a hydrophobic property. Compared with Comparative Example 6, the coating of Comparative Example 5 added nanoparticles having a surface modified without a decane compound, so that the surface of the formed hydrophobic coating was rough, and thus the hydrophobicity was slightly improved. Comparative Example 3 The hydrophobic effect of the removable hydrophobic coating containing the nanoparticles modified with the decane compound was significantly better than that of Comparative Example 5 and Comparative Example 6.

Fig. 2 is a result of infrared spectrum analysis of the hydrophobic coating prepared in Comparative Example 3, the hydrophobic coating prepared in Comparative Example 4, and the petroleum spirit wax. It can be seen from Fig. 2 that the addition of wax does not cause significant change with the spectral absorption peak of the nanoparticle, and it is confirmed that there is no chemical bonding between the wax and the nanoparticle, which can be used to modify the modification with a decane compound. The surface of the nanoparticle retains its hydrophobic character after the wax is added. From the results of Comparative Example 3 and Comparative Example 4, it was even found that the adhesion stability of the removable hydrophobic coating of Comparative Example 3 was greatly improved after the addition of the wax.

The removable hydrophobic coating of the invention has stable adhesion and removability, and can be applied for a wide range of applications, for example, in transportation vehicles, buildings, outdoor parts, portable electronic products. Water-proof soaking, high-humidity salt-resistant environment and easy-to-clean coating on the surface. Removable hydrophobic coatings for use in outdoor appliances may degrade after prolonged use, in which case removal is required to form another new removable hydrophobic coating. Or, sometimes the electronic component processing process needs to modify the components, so the removable hydrophobic coating needs to be removed and re-constructed, and the concept of the present invention is also suitable for other use cases. An embodiment in which the present invention is applied to an appliance will be described below.

Embodiment 3 Application in high pressure insufficiency

The formulation of the removable hydrophobic composition is as follows:

(1) 2 parts by weight of cerium oxide microparticles having a particle diameter of 7 nm;

(2) 20 parts by weight of toluene;

(3) 80 parts by weight of RTV rubber;

(4) 0.1 part by weight of petroleum spirit wax.

The removable hydrophobic composition is directly applied to the surface of the barrier by a paint brush, and then the removable hydrophobic composition is hardened by curing at room temperature to obtain a removable hydrophobic coating. The hydrophobicity of the removable hydrophobic coating can reach 106.1 ± 1.9 degrees. The removable hydrophobic coating has good adhesion on the surface of the occlusion, even after 1000 hours of high temperature and high humidity (85 ° C, 95% RH) weather resistance test, the removable hydrophobic coating on the surface of the etchant It still maintains stable adhesion, no shedding condition, and the hydrophobic angle is still maintained at 104.2±0.7 degrees. When the removable hydrophobic coating on the surface of the barrier needs to be removed, the removable hydrophobic coating can be directly peeled off from the smoothing surface. The new removable hydrophobic composition can be re-coated on the surface of the barrier after stripping off the old removable hydrophobic coating to form a new removable hydrophobic coating.

Embodiment 4 Application on the surface of shoes

The formulation of the removable hydrophobic composition is as follows:

(1) 2 parts by weight of cerium oxide microparticles having a particle diameter of 7 nm;

(2) 10 parts by weight of RTV rubber;

(3) 100 parts by weight of solvent toluene;

(4) 0.1 part by weight of petroleum spirit wax.

The removable hydrophobic composition is brushed directly onto the surface of the shoe with a paint brush, and then the removable hydrophobic composition is hardened after being aged at room temperature to form a removable hydrophobic coating. The removable hydrophobic coating has a hydrophobic angle of up to 111.5 ± 2.5 degrees. The removable hydrophobic coating has good layer adhesion on the surface of the shoe, and the water still does not penetrate the removable hydrophobic coating into the shoe after continuous soaking in the water for 24 hours. After the removable hydrophobic coating on the surface of the shoe is directly peeled off, the new removable hydrophobic composition can be recoated to form another new removable hydrophobic coating.

Embodiment 5 Application on a circuit board

The formulation of the removable hydrophobic composition is as follows:

(1) 1 part by weight of cerium oxide microparticles having a particle diameter of 7 nm;

(2) 40 parts by weight of Acrylic polymer;

(3) 80 parts by weight of a solvent acetate solvent;

(4) 0.1 part by weight of petroleum spirit wax;

(5) 1 part by weight of dioctyl phthalate.

The removable hydrophobic composition is applied to the surface of the board by spray coating or dip coating. After the coating is heated and cured at a temperature of 60 ° C, a removable hydrophobic coating can be obtained. The hydrophobic hydrophobic coating has a hydrophobic angle of up to 91.0 ± 1.2 degrees. The removable hydrophobic coating retains good adhesion after immersion in water for 168 hours and is stably attached to the surface of the board. When the removable hydrophobic coating on the surface of the board needs to be removed, the board can be placed in a butyl acetate solvent to remove the removable hydrophobic coating from the circuit surface. The removable hydrophobic composition can be recoated after removal to form a new removable hydrophobic coating.

In summary, although the preferred embodiments of the present invention are disclosed above, they are not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

S101-S107. . . step

1 is a flow chart showing the preparation of a removable hydrophobic coating in accordance with an embodiment of the present invention.

Figure 2 shows the results of infrared spectroscopy analysis of the removable hydrophobic coating and wax produced in the comparative example.

Claims (10)

A removable hydrophobic composition comprising: a. 0.1 to 50 parts by weight of nano particles having a particle size of less than 100 nm, the surface of the nanoparticles being modified with a decane compound; b. 0.1 to 5 parts by weight An adhesion adjuster or an adhesion inhibitor; c. 100 parts by weight of a solvent; d. 0.1 to 50 parts by weight of a polymer compound, including an acrylic resin, a ruthenium rubber resin, a derivative or a combination of the above materials; and e. Molecular plasticity adjusting aids, including polycaprolactone polyols, dioctyl phthalate, triacetin, isobutyl methacrylate, derivatives or combinations of the above materials. The removable hydrophobic composition of claim 1, wherein the nanoparticles comprise titanium oxide, zinc oxide, aluminum oxide, cerium oxide, derivatives or combinations of the above materials. The removable hydrophobic composition of claim 1, wherein the decane compound comprises hexamethyldioxane, dimethyldichloromethane, trimethoxyoctyldecane, octamethyl a cyclotetraoxane, a polydimethylsiloxane, a tetramethyltetravinylcyclotetramethylene oxide series component, a derivative or a combination of the above materials. The removable hydrophobic composition of claim 1, wherein the solvent comprises an alkane, an aromatic, an alcohol, a ketone, an ester, an ester derivative, or a combination thereof. The removable hydrophobic composition of claim 4, wherein the solvent comprises ethanol, isopropanol, butane, heptane, hexane, Acetone, methyl ethyl ketone, methyl ethyl ketone, toluene, xylene, ethyl acetate, butyl acetate, heteroesters, derivatives or combinations of the above materials. The removable hydrophobic composition of claim 1, wherein the adhesion modifier or adhesion inhibitor comprises petroleum spirit wax, Brazilian wax, beeswax, a derivative or combination of the above materials. The removable hydrophobic composition of claim 1, wherein the adhesion modifier or adhesion inhibitor functions to provide the removable hydrophobic composition with removable properties. A method of preparing a removable hydrophobic coating comprising: (a) providing a removable hydrophobic composition as described in claim 1; (b) combining the removable hydrophobicity Applied to a surface of a substrate; and (c) volatilizing the solvent in the removable hydrophobic composition, the removable hydrophobic composition forms a removable surface on the substrate Dividing hydrophobic coating. The method for preparing a removable hydrophobic coating according to claim 8, further comprising: after removing the removable hydrophobic coating, another removable hydrophobic composition Applied to the surface of the substrate; and after volatilizing the solvent in the other removable hydrophobic composition, the another removable hydrophobic composition forms another on the surface of the substrate Removed hydrophobic coating. A removable hydrophobic coating that is patented The preparation method described in item 8 is formed.