Fluorosilicone modified Paraloid B72 resin protective paint, coating, preparation method and application

Abstract

The invention discloses fluorosilicone modified Paraloid B72 resin protective paint, a coating, a preparation method and application, and belongs to the field of cultural relic protection. According to the resin protective paint, acrylic resin Paraloid B72 with good transparency and high glossiness is used as a matrix, C13H13F17O3Si is used as a modifier, C10H20O5Si is used as a silane coupling agent, fluorosilicone modified Paraloid B72 resin protective paint is successfully prepared through a simple stirring method, and a coating functional material combines the synergistic advantages of Paraloid B72, C13H13F17O3Si and C10H20O5Si, is used for sealing and protecting a woodware matrix and has the characteristics of amphiphobic property and corrosion resistance. When the fluorination modification concentration is 5%, the prepared functional coating can effectively protect the woodware cultural relics, and is expected to be applied to the protection of the woodware cultural relics.

Description

Technical Field

[0001] The invention belongs to the field of cultural relics protection and relates to a fluorosilicone modified Paraloid B72 resin protective paint, a coating and a preparation method and application thereof. Background Art

[0002] As a precious cultural heritage, cultural relics are witnesses of human history and a non-renewable resource. However, due to thousands of years of historical changes, cultural relics have suffered varying degrees of human destruction and natural aging. Cultural relic protection has become one of the necessary measures to promote the development and inheritance of traditional culture.

[0003] Protective coatings, such as acrylate polymers Paraoid B72 / B44 and primal AC33, have good film-forming ability and transparency and are widely used in the protection and reinforcement of cultural relics surfaces. Ntelia et al. prepared a transparent superhydrophobic Paraloid B72 coating by embedding silica on glass, marble, brass and wood. The degree of visual effect of the coating was highly dependent on the initial color of the substrate. In particular, the color effects of the nanoparticles on the treated marble, wood and brass were negligible, moderate and huge, respectively. The study also found that the superhydrophobic Paraloid B72 coating was chemically stable to alkaline and acidic aqueous solutions.

[0004] However, these acrylic polymers also have some inherent defects. First, Paraloid B72 (acrylic resin) is hydrophilic and can hardly block ultraviolet rays and cannot protect against ultraviolet rays. In addition, under the action of water and ultraviolet light, Paraloid B72 will gradually turn white and become condensed, which will cause the color and pattern of the protected object to be blurred and discolored, and will also cause the protective coating formed by it to have poor weather resistance and easy cracking of the coating. Therefore, it is very necessary to modify Paraloid B72 to enhance its ultraviolet resistance and hydrophobicity. Summary of the invention

[0005] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a fluorosilicone modified Paraloid B72 resin protective paint, coating and its preparation method and application, which is modified by a fluorination agent to enhance the hydrophobicity, weather resistance and mechanical properties of the coating.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The first object of the present invention is to provide a fluorosilicone modified Paraloid B72 resin protective paint, comprising 2 to 20 parts of Paraloid B72, 0.5 to 2 parts of a silane coupling agent, 0.5 to 6 parts of a fluorosilicone modifier, and 170 to 190 parts of a solvent, calculated by weight.

[0007] Paraloid B72 has excellent transparency and glossiness. After coating, it can not only protect the surface but also maintain its original visual effect. In addition, Paraloid B72 can resist the influence of ultraviolet rays and natural aging, so it can maintain stable performance for a long time in outdoor applications. Paraloid B72 has good adhesion to a variety of substrates and can firmly adhere to different surfaces, enhancing its durability and stability.

[0008] Preferably, the fluorosilicone modifier is fluorosilicone resin. Fluorosilicone resin has excellent weather resistance and can remain stable for a long time under strong ultraviolet rays and extreme climate conditions. In addition, the surface of fluorosilicone resin usually has ultra-low surface energy, which makes it have excellent anti-fouling properties, and liquids such as water and oil are difficult to adhere and easy to clean. It can work together with the above-mentioned Paraloid B72 to maintain the gloss of wood and extend the service life of wood.

[0009] Preferably, the silane coupling agent is one or more of vinyl trimethoxy silane, vinyl tri (β-methoxyethoxy) silane, vinyl triethoxy silane, and γ-methacryloxypropyl trimethoxy silane.

[0010] The role of the silane coupling agent is to promote the chemical bonding between the fluorosilicone resin and Paraloid B72 and improve the compatibility between the fluorosilicone resin and Paraloid B72. In addition, the active groups of the silane coupling agent, such as amino and hydroxyl groups, can react with the active groups of the fluorination agent to form a cross-linked network and optimize the mechanical properties of the coating.

[0011] Preferably, the solvent is ethanol.

[0012] The second object of the present invention is to provide a method for preparing the above-mentioned fluorosilicone modified Paraloid B72 resin protective paint, comprising the following steps: mixing Paraloid B72 and a solvent and stirring them uniformly, adding ammonia water dropwise, and continuing to mix and stir to form a Paraloid B72 solution; then adding a silane coupling agent to the Paraloid B72 solution and stirring and mixing them uniformly, and then adding a fluorosilicone modifier and continuing to stir to obtain the fluorosilicone modified acrylic resin protective paint.

[0013] Preferably, during the preparation process, ultrasonic stirring is performed for 10 to 30 minutes to form a Paraloid B72 solution, and the silane coupling agent and the fluorine-silicon modification are added to the Paraloid B72 solution and ultrasonic stirring is performed for 1 hour to 2 hours.

[0014] The third object of the present invention is to provide a coating formed by the above-mentioned fluorosilicone modified Paraloid B72 resin protective paint.

[0015] The coating is formed by spraying the uniformly mixed fluorine-silicon modified Paraloid B72 resin protective paint on the substrate using a one-step spraying method, and the coating is formed after drying.

[0016] Preferably, the coating drying temperature is 55-65° C. and the drying time is 8-14 hours.

[0017] The fourth object of the present invention is to propose the use of the above-mentioned fluorosilicone modified Paraloid B72 resin protective paint and the above-mentioned coating in the field of anti-fouling of wooden cultural relics.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The fluorosilicone modified Paraloid B72 resin protective paint of the present invention comprises components such as Paraloid B72, a silane coupling agent, and a fluorosilicone resin dispersed in an acrylic resin. The fluorosilicone resin is combined with the acrylic resin to form a cross-linked network. The fluorine element of the fluorosilicone resin makes the coating have excellent hydrophobicity and chemical stability. In addition, the fluorine atoms in the fluorosilicone resin can form a strong interface interaction with the hydroxyl group of Paraloid B72 through hydrogen bonds, and can construct a fluorosilicone modified acrylic resin sealing coating with good adhesion and low surface energy, effectively combining the advantages of fluorosilicone structure stability and low surface energy, so that the surface properties of the acrylic coating are further improved. The present invention combines the synergistic advantages of fluorosilicone resin and Paraloid B72, not only retains the basic properties of Paraloid B72 resin, such as good adhesion and handling, but also increases excellent properties such as weather resistance, stain resistance and mechanical properties, so that it has a wide range of application prospects and practical value in the field of wooden cultural relics protection.

[0019] The preparation method of the fluorosilicone modified Paraloid B72 resin protective paint of the present invention adopts a simple stirring method to obtain a fluorosilicone modified Paraloid B72 functional coating with good amphiphilic performance, good coating performance and good anti-ultraviolet performance. The present invention has the advantages of simple preparation process and low production cost. The present invention adopts a one-step spraying method to construct a protective coating on the surface of the target object, which is easy to operate, has a high utilization rate of protective materials, and is suitable for coating of various substrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The XRD patterns of wood matrix, Figure a) is the XRD pattern of pine wood, and Figure b) is the XRD pattern of rosewood; Figure 2 It is a super-depth 2D image of pine wood. Figures a) and c) are the tangent and cross-section images of unaged pine wood, respectively. Figures b) and d) are the tangent and cross-section images of aged pine wood, respectively. Figure 3The super-depth 2D images of rosewood, Figures a) and c) are the tangential and cross-sectional images of unaged rosewood, and Figures b) and d) are the tangential and cross-sectional images of aged rosewood. Figure 4 The super-depth 2D and 3D images of pine wood modified with B72 of different concentrations of fluorosilicone resin; Figure 5 The super-depth 2D and 3D images of B72 small-leaf red sandalwood modified with different concentrations of fluorosilicone resin; Figure 6 The contact angle diagrams of pine wood with different modification concentrations, including a) unmodified pine wood, different modification concentrations b) 1%, c) 2.5%, d) 5%, e) 10% modified pine wood; Figure 7 The contact angle diagrams of rosewood with different modification concentrations, including a) unmodified rosewood, and rosewood with different modification concentrations of b) 1%, c) 2.5%, d) 5%, and e) 10%; Figure 8 is the water absorption rate of B72 pine wood modified with fluorosilicone resin at different concentrations; Fig. 9 The water absorption rate of B72 rosewood modified with different concentrations of fluorosilicone resin; Fig.10 The change of Shore hardness HA of pine and rosewood with different modification concentrations. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 creative work should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings: The reagents in the examples of the present invention are all commercial reagents without further treatment. The purity of trimethoxy (1H, 1H, 2H, 2H-heptadecafluorodecyl) silane is 98%, and the purity of silane coupling agent (KH570) is 98%.

[0024] Example 1 Step 1, preparation of aged pine and rosewood: First, cut the pine and rosewood into 2×2×2 cm sizes, and polish the wood blocks with 80-grit sandpaper. The cut and polished wood block samples were completely immersed in water for 10 h, and then dried in an electric hot air drying oven at 105°C for 6 h. This cycle was repeated for 30 days to obtain the artificially accelerated aged samples.

[0025] Step 2, preparation of Paraloid B72 material: First, weigh 0.2 g of Paraloid B72 and add the weighed Paraloid B72 to 23.76 ml of anhydrous ethanol. Secondly, put the above solution into a CNC ultrasonic cleaner and stir it ultrasonically for 10 minutes; then, slowly add 2-3 drops of ammonia water to the prepared solution and stir it ultrasonically for 30 minutes to help the B72 resin dissolve better in ethanol.

[0026] Step 3, preparation of fluorosilicone modified Paraloid B72 functional material: First, use a pipette to draw 100 uL of C 10 H 20 O5Si, drop it into the acrylic resin solution obtained in step 2 to provide surface active groups, and continue stirring under magnetic stirring for 1 h to obtain a mixed solution; secondly, use a pipette to absorb 40 uL of C 13 H 13 F 17 O3Si was added to the mixed solution, and the mixture was stirred for 2 h under magnetic stirring to obtain a 1% by mass fluorine-silicon modified Paraloid B72 functional material.

[0027] Step 4, preparation of fluorosilicone modified Paraloid B72 functional coating: first, stir the solution obtained in step 3 in a CNC ultrasonic stirrer for 30 min; second, put the above-mentioned evenly dispersed fluorosilicone modified Paraloid B72 solution into a spray gun, and use a one-step spraying method to evenly spray it on the aged pine wood and aged rosewood obtained in step 1; finally, place it in a 60°C forced air drying oven for one night to obtain a protective coating with good hydrophobicity, UV resistance and anti-fouling properties.

[0028] Example 2 Step 1, preparation of aged pine and rosewood: First, cut the pine and rosewood into 2×2×2 cm sizes, and polish the wood blocks with 80-grit sandpaper. The cut and polished wood block samples were completely immersed in water for 10 h, and then dried in an electric hot air drying oven at 105°C for 6 h. This cycle was repeated for 30 days to obtain the artificially accelerated aged samples.

[0029] Step 2, preparation of Paraloid B72 material: First, weigh 0.5 g of Paraloid B72 and add the weighed B72 to 23.4 ml of anhydrous ethanol. Secondly, put the above solution into a CNC ultrasonic cleaner and stir it ultrasonically for 10 minutes; then, slowly add 2-3 drops of ammonia water to the prepared solution and stir it ultrasonically for 30 minutes to help the Paraloid B72 resin dissolve better in ethanol.

[0030] Step 3, preparation of fluorosilicone modified Paraloid B72 functional material: First, use a pipette to draw 100 uL of C 10 H 20 O5Si, drop it into the acrylic resin solution obtained in step 2 to provide surface active groups, and continue stirring under magnetic stirring for 1 h to obtain a mixed solution; secondly, use a pipette to draw 100 uL of C 13 H 13 F 17 O3Si was added to the mixed solution, and the mixture was stirred for 2 h under magnetic stirring to obtain a 2.5% by mass fluorine-silicon modified Paraloid B72 functional material.

[0031] Step 4, preparation of fluorosilicone modified Paraloid B72 functional coating: first, stirring the solution obtained in step 3 in a CNC ultrasonic stirrer for 30 min; second, placing the above-mentioned evenly dispersed fluorosilicone modified Paraloid B72 solution in a spray gun, and using a one-step spraying method to evenly spray it on the aged pine wood and aged rosewood obtained in step 1; finally, placing it in a 60°C forced air drying oven for one night to obtain a protective coating with good hydrophobicity, UV resistance, and anti-fouling properties.

[0032] Example 3 Step 1, preparation of aged pine and rosewood: First, cut the pine and rosewood into 2×2×2 cm sizes, and polish the wood blocks with 80-grit sandpaper. The cut and polished wood block samples were completely immersed in water for 10 h, and then dried in an electric hot air drying oven at 105°C for 6 h. This cycle was repeated for 30 days to obtain the artificially accelerated aged samples.

[0033] Step 2, preparation of Paraloid B72 material: First, weigh 1 g of Paraloid B72 and add the weighed B72 to 22.8 ml of anhydrous ethanol. Secondly, put the above solution into a CNC ultrasonic cleaner and stir it ultrasonically for 10 minutes; then, slowly add 2-3 drops of ammonia water to the prepared solution and stir it ultrasonically for 30 minutes to help the Paraloid B72 resin dissolve better in ethanol.

[0034] Step 3, preparation of fluorosilicone modified Paraloid B72 functional material: First, use a pipette to draw 100 uL of C 10 H 20 O5Si, drop it into the acrylic resin solution obtained in step 2 to provide surface active groups, and continue stirring under magnetic stirring for 1 h to obtain a mixed solution; secondly, use a pipette to draw 200 uL of C 13 H 13 F 17 O3Si was added to the mixed solution, and the mixture was stirred for 2 h under magnetic stirring to obtain a 5% by mass fluorine-silicon modified Paraloid B72 functional material.

[0035] Step 4, preparation of fluorosilicone modified Paraloid B72 functional coating: first, stirring the solution obtained in step 3 in a CNC ultrasonic stirrer for 30 min; second, placing the above-mentioned evenly dispersed fluorosilicone modified Paraloid B72 solution in a spray gun, and using a one-step spraying method to evenly spray it on the aged pine wood and aged rosewood obtained in step 1; finally, placing it in a 60°C forced air drying oven for one night to obtain a protective coating with good hydrophobicity, UV resistance, and anti-fouling properties.

[0036] Example 4 Step 1, preparation of aged pine and rosewood: First, cut the pine and rosewood into 2×2×2 cm sizes, and polish the wood blocks with 80-grit sandpaper. The cut and polished wood block samples were completely immersed in water for 10 h, and then dried in an electric hot air drying oven at 105°C for 6 h. This cycle was repeated for 30 days to obtain the artificially accelerated aged samples.

[0037] Step 2, preparation of Paraloid B72 material: First, weigh 2 g of Paraloid B72 and add the weighed B72 to 21.6 ml of anhydrous ethanol. Secondly, put the above solution into a CNC ultrasonic cleaner and stir it ultrasonically for 10 minutes; then, slowly add 2-3 drops of ammonia water to the prepared solution and stir it ultrasonically for 30 minutes to help the Paraloid B72 resin dissolve better in ethanol.

[0038] Step 3, preparation of fluorosilicone modified Paraloid B72 functional material: First, use a pipette to draw 100 uL of C 10 H 20 O5Si, drop it into the acrylic resin solution obtained in step 2 to provide surface active groups, and continue stirring under magnetic stirring for 1 h to obtain a mixed solution; secondly, use a pipette to draw 400 uL of C 13 H 13 F 17 O3Si was added to the mixed solution, and the mixture was stirred for 2 h under magnetic stirring to obtain a 10% by mass fluorine-silicon modified Paraloid B72 functional material.

[0039] Step 4, preparation of fluorosilicone modified Paraloid B72 functional coating: first, stirring the solution obtained in step 3 in a CNC ultrasonic stirrer for 30 min; second, placing the above-mentioned evenly dispersed fluorosilicone modified Paraloid B72 solution in a spray gun, and using a one-step spraying method to evenly spray it on the aged pine wood and aged rosewood obtained in step 1; finally, placing it in a 60°C forced air drying oven for one night to obtain a protective coating with good hydrophobicity, UV resistance, and anti-fouling properties.

[0040] Effect example The XRD patterns of unaged pine and rosewood matrices are shown in Figure 2. Figure 1-3 shown.

[0041] Figure 1 Figure a) is the XRD image of pine wood, and Figure b) is the XRD image of rosewood. From Figure a), we can see that pine wood has θ At 16° and 22.5°, there are diffraction peaks of cellulose, and the peaks are sharper. Compared with pine, as a hardwood, the XRD image of rosewood shows more broad peaks and more complex diffraction patterns, which reflects the complex crystal structure and composition of rosewood.

[0042] Figure 2 The ultra-depth 2D images of pine wood are shown. Figures a) and c) are the tangent and cross-section images of unaged pine wood, and Figures b) and d) are the tangent and cross-section images of aged pine wood. It can be seen from the figure that the color of unaged pine wood is relatively uniform, showing a natural pine wood tone, and the surface texture is relatively smooth and uniform, and the shape of the pores is well maintained. With aging, the color of the wood turns yellow, dark, brown, etc., and the surface becomes rough, cracks increase, the cell wall is deformed and broken, and the cell gap becomes more obvious.

[0043] Figure 3The ultra-depth 2D images of rosewood are shown. Figures a) and c) are the tangential and cross-sectional images of unaged rosewood, and Figures b) and d) are the tangential and cross-sectional images of aged rosewood. It can be seen from the figures that compared with unaged rosewood, the aged rosewood has cracks on the surface, the color becomes darker, and the gaps become larger and irregular.

[0044] like Figure 4 Shown are super-depth two-dimensional images and three-dimensional images of pine wood coated with protective paint coatings of fluorine-silicon-modified acrylic resins of different concentrations in Examples 1-4 of the present invention. It can be seen from the figure that the protective paint coating of fluorine-silicon-modified acrylic resins forms a smooth protective film, which increases the overall durability of the pine wood. As can be seen from the figure, the pine wood with coating has a higher color saturation, which will reduce the aging of the wood blocks under light, so that the pine wood blocks have a certain weather resistance. In addition, the surface defects of the pine wood with coating, such as cracks and gaps, are less, indicating that the fluorine-silicon-modified acrylic resin coating can effectively protect the wood and reduce the damage caused by aging. It can also improve the weather resistance of the pine wood surface and reduce the color fading and surface damage of the wood during the aging process. In addition, this modified coating can provide better wear resistance and protect the pine wood surface from damage caused by friction, scratches and wear.

[0045] like Figure 5 Shown are super-depth two-dimensional images and three-dimensional images of small-leaf red sandalwood coated with protective paint coatings of fluorine-silicon modified acrylic resins in different concentrations of Examples 1-4 of the present invention. It can be seen from the figure that compared with the modified concentrations of a1) 1% and b1) 2.5%, c1) 5% and d1) 10%, the film-forming surface is smoother, showing better uniformity and continuity. In addition, it can be seen from the figure that the super-depth two-dimensional image at a concentration of 10% shows that the coating on the surface of the small-leaf red sandalwood is thicker, so that the entire coating has a wider contact with the wood surface, enhancing the adhesion, and after the coating thickness increases, its surface is smoother. Therefore, under higher concentration modification, the fluorine-silicon modified acrylic resin protective paint can better adhere to the surface of the small-leaf red sandalwood, forming a tighter combination. This tight combination helps to improve the adhesion and durability between the coating and the small-leaf red sandalwood, thereby better protecting the surface of the small-leaf red sandalwood.

[0046] Figure 6The contact angle diagram of pine wood coated with protective paint coatings of fluorine-silicon modified acrylic resins of different concentrations in Examples 1-4 of the present invention is shown. It can be seen that the contact angle of a) unmodified pine wood is 39.1°, and the contact angles of the coatings formed by protective paints of different modified concentrations b) 1%, c) 2.5%, d) 5%, and e) 10% in Examples 1-4 are 120.2°, 124.3°, 129.8°, and 137.5°, respectively. By comparison, it can be found that the hydrophobicity of the surface of the modified pine wood is significantly enhanced. With the increase of the concentration of fluorine-silicon resin, the fluorine-silicon content of the film-forming surface gradually increases. These fluorine-silicon groups have a lower surface energy, which enhances the surface's repulsion to water. Therefore, the contact angle gradually increases and the water resistance and anti-adhesion properties are improved.

[0047] Figure 7 Shown is a contact angle diagram of rosewood coated with protective paint coatings of fluorine-silicon modified acrylic resins of different concentrations in Examples 1-4 of the present invention. It can be seen that the contact angle of a) unmodified rosewood is 99.6°. The contact angles of the coatings formed by protective paints of different modified concentrations b) 1%, c) 2.5%, d) 5%, and e) 10% in Examples 1-4 on rosewood are 117.4°, 126.1°, 128°, and 142.4°, respectively. As the modification concentration increases, the contact angle increases further. A higher concentration of modifier makes the coating smoother and reduces the surface tension, thereby increasing the sliding property of the liquid on the surface and forming a larger contact angle. Compared with the surface of rosewood without coating, the contact angle of the modified rosewood increases significantly with the increase of concentration. When the concentration is 10%, the contact angle reaches 142.4°, and the hydrophobic property is significantly enhanced.

[0048] Figure 8 Shown is the water absorption rate of pine wood coated with protective paint coating of fluorine-silicon modified acrylic resin of different concentrations in Examples 1-4 of the present invention, the water absorption rate of unmodified pine wood is 89.31%, and the water absorption rates of pine wood with different modified concentrations of 1%, 2.5%, 5%, and 10% are 72.42%, 60.61%, 59.04%, and 62.51%, respectively. For pine wood, there is a rich pore structure inside, and the original water absorption performance is usually high. For pine wood with spray coating, its surface has stronger hydrophobicity, which can effectively block the penetration of water, thereby reducing the water absorption rate of pine wood. With the increase of modification concentration, the content of fluorine-silicon group on the film-forming surface gradually increases, forming a more dense hydrophobic layer, which can effectively repel moisture and significantly reduce the water absorption of pine wood.

[0049] Fig. 9The water absorption rate of the small-leaf red sandalwood coated with different concentrations of fluorine-silicon modified acrylic resin protective paint coatings in Examples 1-4 of the present invention is shown. For the small-leaf red sandalwood, which has a dense structure, the water absorption rate of the unmodified small-leaf red sandalwood is only 17.1% compared to pine. At a concentration of 10% of the fluorine-silicon modified acrylic resin protective paint, the hydrophobicity of the small-leaf red sandalwood is significantly enhanced, and its water absorption rate is 8.68%, which indicates that the film formation of the fluorine-silicon modified acrylic resin protective paint can effectively enhance the hydrophobic and anti-fouling properties of the small-leaf red sandalwood.

[0050] Fig.10 The figure shows the change in Shore hardness HA of pine and rosewood coated with different concentrations of fluorosilicone modified acrylic resin protective paint coatings according to Examples 1-4 of the present invention. By comparison, it can be found that the hardness of pine and rosewood sprayed with fluorosilicone modified acrylic resin protective paint has increased to a certain extent. This is because fluorosilicone resin itself has high hardness and wear resistance, and can form a hard and smooth coating after spraying on the surface of the wood block, which effectively prevents the wood surface from being scratched or worn due to force.

[0051] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A fluorosilicone modified Paraloid B72 resin protective paint, It is characterized in that The invention comprises 2 to 20 parts of Paraloid B72, 0.5 to 2 parts of silane coupling agent, 0.5 to 6 parts of fluorosilicone modifier and 170 to 190 parts of solvent, calculated by weight.

2. The fluorosilicone modified Paraloid B72 resin protective paint according to claim 1, It is characterized in that The silane coupling agent is one or more of vinyl trimethoxy silane, vinyl tri (β-methoxyethoxy) silane, vinyl triethoxy silane, and trimethoxy (1H, 1H, 2H, 2H-heptadecafluorodecyl) silane.

3. The fluorine-silicon modified Paraloid B72 resin protective paint according to claim 1, It is characterized in that The fluorosilicone modifier is fluorosilicone resin.

4. The fluorine-silicon modified Paraloid B72 resin protective paint according to claim 1, It is characterized in that The solvent is ethanol.

5. The method for preparing the fluorosilicone modified Paraloid B72 resin protective paint according to any one of claims 1 to 4, It is characterized in that The method comprises the following steps: mixing Paraloid B72 and a solvent and stirring them uniformly, adding ammonia water dropwise, and continuing to mix and stir to form a Paraloid B72 solution; then adding a silane coupling agent to the Paraloid B72 solution and stirring and mixing them uniformly, and then adding a fluorosilicone modifier and continuing to stir to obtain the fluorosilicone modified acrylic resin protective paint.

6. The method for preparing the fluorosilicone modified Paraloid B72 resin protective paint according to claim 5, It is characterized in that The Paraloid B72 solution is formed by ultrasonic stirring for 10 to 30 minutes, and the silane coupling agent and the fluorine silicon modification are added to the Paraloid B72 solution and the ultrasonic stirring time is 1 hour to 2 hours.

7. A coating formed by the fluorosilicone modified acrylic resin protective paint according to any one of claims 1 to 4.

8. The coating according to claim 7, It is characterized in that The uniformly mixed fluorosilicone modified Paraloid B72 resin protective paint is sprayed on the substrate using a one-step spraying method, and a coating is formed after drying.

9. The coating according to claim 8, It is characterized in that The drying temperature is 55~65℃ and the drying time is 8~14h.

10. Use of the fluorosilicone modified Paraloid B72 resin protective paint according to any one of claims 1 to 4 or the coating according to any one of claims 7 to 9 in the field of antifouling of wooden cultural relics.

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