Two-dimensional amphiphilic polymer coating, coating and preparation method

Abstract

The invention discloses a two-dimensional amphiphilic polymer coating, a coating and a preparation method. The polymer coating is obtained by modifying two-dimensional polycarboxylate / polycarboxylic acid through a grafted alkyl chain. According to the amphiphilic polymer coating, the distribution density of hydrophilic groups in a two-dimensional plane is improved through the large specific surface area of the two-dimensional polymer, the best balance between hydrophilicity and hydrophobicity is achieved, the adhesive force with the plastic surface is remarkably improved, the coating has the lasting anti-fog performance, and the anti-fog performance of the coating is improved. Meanwhile, excellent wear-resistant and scratch-resistant performance is realized. The preparation method of the paint and the coating is simple, low in cost and suitable for industrial large-scale application.

Description

Technical Field

[0001] The invention relates to a polymer coating, in particular to a two-dimensional amphiphilic polymer coating, and also to a polymer coating and a preparation method, belonging to the technical field of coating materials. Background Art

[0002] Transparent materials have been widely used in industrial and civilian fields due to their excellent optical properties, such as solar cell glass, car windshields, glass curtain walls, medical goggles, daily glasses, and light-transmitting films. However, in cold winter or when there is a temperature difference, the surface of the material often "fogs", causing its transparency to drop significantly, affecting its use effect. Therefore, exploring methods to prevent transparent materials from fogging is of great significance to people's production and life.

[0003] So far, there are two main approaches to solving the problem of fogging on the surface of transparent materials. The first is to destroy the environmental conditions of the fogging surface, causing the condensed fine fog droplets to turn back into water vapor, thereby restoring the optical properties of the transparent material. This method usually requires the design of specific equipment and generates additional energy consumption when used, so it is less versatile and convenient, and its application occasions are greatly limited.

[0004] Another idea is to change the affinity between the substrate surface and water droplets. After the droplets are formed, they can roll down, be inhaled or spread on the substrate surface in a very short time, thereby eliminating the negative impact of the droplets on the optical properties of the substrate. Among them, the hydrophilic anti-fog coating that enables the droplets to spread on the substrate surface has received extensive attention and research and is considered to be the most promising anti-fog method.

[0005] In recent years, the research on super-hydrophilic anti-fog coatings has made great progress, but there are still challenges that hinder their large-scale application, that is, the coating has a short service life and the anti-fog effect is difficult to maintain for a long time in actual application environments. The main reason for this problem is the many contradictions between the characteristics of the substrate and the coating itself and the application environment. For example, the substrate with anti-fog requirements has high light transmittance requirements, so the thickness of the anti-fog coating must be strictly controlled to retain the excellent light transmittance of the substrate; the surface of the transparent substrate is smooth, which makes it difficult for the anti-fog coating to adhere firmly to its surface; in addition, the high surface energy components in the super-hydrophilic anti-fog coating are easy to gradually reduce or even lose under external forces or even in natural environments, and the component stability is poor. However, when the coating is applied, it is inevitable to face scenes such as wear, humidity, and high temperature, which requires the coating to have high adhesion and component stability. Therefore, how to increase the strength of the coating, improve the adhesion between the coating and the substrate, and enhance the stability of the high surface energy components while maintaining high light transmittance are the research focuses and difficulties of super-hydrophilic anti-fog coatings.

[0006] In addition, developing an adequate anti-fog layer for plastic substrates also presents several challenges. For example, compatibility issues can arise because not all coatings can work well with every type of substrate, which limits their applicability. During the application process of anti-fog coatings, it is often necessary to pre-treat plastic substrates, such as through plasma or corona discharge. However, both plasma and corona treatments require specialized equipment and may result in the release of volatile organic compounds (VOCs) or other environmentally harmful by-products. Moreover, the energy consumption and maintenance costs associated with these processes can be substantial, posing economic and environmental challenges to their industrial-scale applications. Therefore, developing an anti-fog coating that does not require pre-treatment, has strong adhesion to the surface of plastic substrates, and high durability has broad application prospects. Summary of the Invention

[0007] Aiming at the defects existing in the prior art, the first object of the present invention is to provide a two-dimensional amphiphilic polymer coating. The two-dimensional polymer in this coating has a large specific surface area, which increases the distribution density of hydrophilic groups in the two-dimensional plane, achieving an optimal balance between hydrophilicity and hydrophobicity, greatly improving the adhesion to plastic substrates, enabling the coating to have a long-lasting anti-fog performance. Additionally, through the non-covalent interaction of functional groups between two-dimensional lamellae, the coating is endowed with excellent mechanical properties.

[0008] The second object of the present invention is to provide a preparation method for the two-dimensional amphiphilic polymer coating. This method is simple, easy to operate, and has low costs, making it suitable for industrial production.

[0009] The third object of the present invention is to provide a polymer coating. This coating has a long-lasting and stable anti-fog performance, strong adhesion to the plastic surface, and is wear-resistant and scratch-resistant.

[0010] The fourth object of the present invention is to provide a preparation method for the polymer coating. This method is simple, convenient to operate, and environmentally friendly.

[0011] To achieve the above technical objectives, the present invention provides a preparation method for a two-dimensional amphiphilic polymer coating. This method involves cationizing 5-(4-vinylbenzyloxy) isophthalic acid monomer with tetramethylguanidine and then obtaining a two-dimensional polycarboxylic acid product through a polymerization reaction; the two-dimensional polycarboxylic acid product is subjected to an esterification reaction with a monohaloalkane to obtain the coating.

[0012] The 5-(4-vinylbenzyloxy) isophthalic acid monomer is obtained by a substitution reaction of dimethyl 5-hydroxyisophthalate and 4-vinylbenzyl chloride to obtain the dimethyl 5-(4-vinylbenzyloxy) isophthalate monomer, and then the dimethyl 5-(4-vinylbenzyloxy) isophthalate monomer is prepared through hydrolysis and acidification reactions.

[0013] The present invention obtains two-dimensional polycarboxylic acid / polycarboxylate through free radical polymerization of hydrophilic carboxylate monomers. This two-dimensional polymer has a large specific surface area, and the polymer surface contains a large number of hydrophilic groups, showing superhydrophilic properties. However, due to the high surface energy components in the superhydrophilic anti-fog coating, they are prone to gradually decrease or even be lost under external forces or even natural environments, and the component stability is poor. Therefore, in the present invention, hydrophobic alkyl chains are grafted onto the surface through an esterification reaction to effectively adjust the hydrophilicity and hydrophobicity of the two-dimensional polymer surface. On the one hand, the interaction force between two-dimensional layers is reduced, significantly improving the adhesion and mechanical properties of the film; on the other hand, the surface energy of the polymer coating is reduced, improving the long-lasting anti-fog performance of the coating, thereby greatly increasing the service life of the coating. In addition, grafting alkyl chains in the two-dimensional carboxylic acid polymer can make the coating surface have a certain roughness, increase the coating surface area, further enhance the mechanical interlocking and durability under stress. At the same time, the rough surface presents a series of nanoscale rough structures, which act as nucleation centers to promote the formation of smaller water droplets, reduce the tendency of light scattering, and thus improve the anti-fog performance.

[0014] As a preferred embodiment, the molar addition amount of the monohaloalkane is 20% - 80% of the two-dimensional polycarboxylic acid product, and further preferably 30% - 70%. The addition amount of the haloalkane determines the grafting rate of the alkyl chain. The larger the addition amount, the higher the grafting rate of the alkyl chain. Controlling the grafting rate within a suitable range can ensure that the coating has good anti-fog effect and scratch resistance. If the grafting rate is too low, the mechanical properties of the coating, especially the scratch resistance, will decrease. If the grafting rate is too high, the anti-fog effect will decline.

[0015] As a preferred embodiment, the halogen element in the monohaloalkane includes one of Cl, Br, and I.

[0016] As a preferred embodiment, the number of carbon atoms in the alkyl chain of the monohaloalkane is 3 - 9, and further preferably 4 - 8. Controlling the alkyl chain length within a suitable range can improve the comprehensive performance of the coating. Among them, the shorter the alkyl chain, the better the anti-fog performance of the modified coating, but the shorter alkyl chain cannot improve the mechanical properties of the polymer, resulting in poor wear resistance and adhesion of the coating; the longer the alkyl chain, the larger the intermolecular space generated in the coating, causing water molecules to accumulate, resulting in fine water droplets on the coating surface and a decrease in anti-fog performance.

[0017] As a preferred embodiment, the two-dimensional polycarboxylic acid product is prepared as a solution for the esterification reaction. The mass concentration of the two-dimensional polycarboxylic acid product solution is 5% - 20%.

[0018] As a preferred embodiment, the conditions for the esterification reaction are: using tetramethylguanidine as a catalyst, the temperature is 20 - 45°C, and the time is 10 - 15 h.

[0019] As a preferred embodiment, the polymerization reaction is carried out under a redox radical initiation system.

[0020] As a preferred embodiment, the reaction solution after the polymerization reaction is dialyzed using a dialysis bag with a molecular weight cut-off of 8000, and the obtained dialysate is freeze-dried to obtain a two-dimensional polycarboxylate. The two-dimensional polycarboxylate can be acidified to obtain a two-dimensional polycarboxylic acid.

[0021] As a preferred embodiment, the number average molecular weight of the two-dimensional polycarboxylic acid product is 17000 - 31000.

[0022] As a preferred embodiment, the molar addition amount of tetramethylguanidine is 0.8 - 1.2 times that of the 5-(4-vinylbenzyloxy)isophthalic acid monomer.

[0023] As a preferred embodiment, the reducing agent in the redox radical initiation system is thiosulfate, and the oxidizing agent is persulfate.

[0024] As a preferred embodiment, the molar addition amount of thiosulfate is 0.03 - 0.08 times that of the 5-(4-vinylbenzyloxy)isophthalic acid monomer.

[0025] As a preferred embodiment, the molar addition amount of persulfate is 0.04 - 0.09 times that of the 5-(4-vinylbenzyloxy)isophthalic acid monomer.

[0026] As a preferred embodiment, the thiosulfate is sodium thiosulfate.

[0027] As a preferred embodiment, the persulfate is potassium persulfate.

[0028] As a preferred embodiment, after adding the reducing agent and reacting for 0.5 - 2 h, the oxidizing agent is added and the reaction continues for 6 - 24 h.

[0029] As a preferred embodiment, the preparation process of the 5-(4-vinylbenzyloxy)isophthalic acid monomer is as follows: Dimethyl 5-hydroxyisophthalate, 4-vinylbenzyl chloride, potassium iodide and DMF are mixed and stirred, and then potassium carbonate is added for a substitution reaction to obtain a dimethyl 5-(4-vinylbenzyloxy)isophthalate monomer; The dimethyl 5-(4-vinylbenzyloxy)isophthalate monomer is dissolved in ethanol and then sodium hydroxide solution is added for a hydrolysis reaction, and the obtained reaction product is acidified with hydrochloric acid to obtain 5-(4-vinylbenzyloxy)isophthalic acid.

[0030] The reaction principle involved in this preparation process is as follows:

[0031] (1);

[0032] (2).

[0033] The present invention also provides a two-dimensional amphiphilic polymer coating, which is prepared by the above method.

[0034] The present invention also provides a method for preparing a polymer coating, which comprises immersing a substrate in a solution of the above two-dimensional amphiphilic polymer coating and then performing surface drying treatment to obtain the polymer coating.

[0035] As a preferred embodiment, the mass concentration of the two-dimensional amphiphilic polymer coating solution is 1% - 5%.

[0036] As a preferred embodiment, the immersion temperature is room temperature and the immersion time is 8 - 15 min.

[0037] As a preferred embodiment, the substrate includes LDPE, PC, PET, glass, etc.

[0038] The present invention also provides a polymer coating, which is prepared by the above method.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] (1) By forming a modified amphiphilic polymer through two-dimensional polycarboxylate / polycarboxylic acid grafted alkyl chains, the polymer achieves an optimal balance between hydrophilicity and hydrophobicity, improving the adhesion to the plastic surface and effectively overcoming the major drawback of ordinary polymer anti-fog coatings, that is, superhydrophilic polymers are beneficial for anti-fogging but are prone to swelling or dissolution, losing the anti-fogging performance.

[0041] (2) The prepared polymer coating has a lasting anti-fogging effect, good mechanical properties, wear resistance and scratch resistance, high stability, good adaptability to various substrates, strong adhesion to plastic substrates, and does not require pretreatment of plastic substrates such as plasma or corona discharge, significantly reducing the production cost and reducing the release of volatile organic compounds (VOCs) or other environmentally harmful by-products.

[0042] (3) The preparation method is simple, easy to operate, and low in cost, suitable for industrial scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 1H NMR spectrum of the carboxylic acid monomer prepared in Example 1.

[0044] Figure 2 1H NMR spectrum of the two-dimensional polycarboxylic acid polymer prepared in Example 1.

[0045] Figure 3The figure shows the thermal fog test results of the glass with the coating prepared in Example 3 on its surface and the glass without the coating.

[0046] Figure 4 The figure shows the comparison of the microscopic morphologies of the coatings prepared in Example 1, Example 3, and Comparative Example 1 after the scratch test. Detailed implementation manners

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0048] Example 1

[0049] (1) Synthesis of carboxylic acid monomer

[0050] Weigh 5-hydroxyisophthalic acid dimethyl ester (2.10 g, 10 mmol) and potassium iodide (0.332 g, 2 mmol) into a reaction flask, add 4-vinylbenzyl chloride (1.8 mL, 10 mmol), and finally add DMF (10 mL). Slowly add potassium carbonate (3.317 g, 24 mmol) under stirring, and heat up to 40 °C for overnight reaction. After the reaction, add dichloromethane (20 mL), extract three times with distilled water, and dry the organic layer with anhydrous sodium sulfate. Rotate and evaporate the solvent under reduced pressure, ultrasonically clean the obtained yellow solid with methanol, filter by suction, repeat several times to obtain a white solid, and dry it under vacuum to obtain the carboxylic acid ester monomer (dimethyl 5-(4-vinylbenzyloxy)isophthalate).

[0051] Weigh the carboxylic acid ester monomer (3.12 g, 10 mmol) into a reaction flask, add ethanol (20 mL) and heat to dissolve. Subsequently, add a solution of sodium hydroxide (1.80 g, 20 mmol) in water (10 mL) and stir, and heat up to 80 °C for reflux reaction. After the reaction, the solution is yellow and transparent. Rotate and evaporate the ethanol under reduced pressure, acidify with dilute hydrochloric acid, filter and collect the precipitate, and wash it with a large amount of water and ethanol to obtain the carboxylic acid monomer (5-(4-vinylbenzyloxy)isophthalic acid), and its 1H NMR spectrum is shown in Figure 1 .

[0052] (2) Synthesis of two-dimensional polymer

[0053] .

[0054] Weigh the carboxylic acid monomer (0.284 g, 1 mmol), add it to water (10 g) containing TMG (1 mmol), and stir to dissolve to obtain a clear solution. After performing the freeze-pump-thaw-nitrogen filling operation three times for gas exchange, control the temperature at 30 °C, use a magnetic stirrer at 500 r / min, add the reducing agent sodium thiosulfate pentahydrate (0.012 g, 0.05 mmol) and react for 1 h, then add the oxidizing agent potassium persulfate (0.016 g, 0.06 mmol) and continue to react for 23 h. After the polymerization reaction is completed, transfer the polymer solution into a dialysis bag with a molecular weight cut-off of 8000 and dialyze for one week. The dialysis solvent is water, and it is changed 5 times a day. Freeze the dialysate with liquid nitrogen and then perform vacuum freeze-drying to obtain two-dimensional polycarboxylate. The two-dimensional polycarboxylate can be acidified with hydrochloric acid to obtain two-dimensional polycarboxylic acid. The 1H NMR spectrum of this two-dimensional polycarboxylic acid polymer is shown in Figure 2 , where line 1 is the 1H NMR spectrum of the two-dimensional polymer, and line 2 in the partial enlarged view is the 1H NMR spectrum of the carboxylic acid monomer before polymerization.

[0055] (3)Grafting surface modification of two-dimensional polycarboxylic acid / carboxylate polymer

[0056] Take the above two-dimensional polymer and prepare a solution with a mass concentration of 10% (the solvent is water), add 1-bromopropane (C3), where the molar amount of bromopropane is 0.6 times that of the two-dimensional polymer (calculated based on the carboxylate functional group) (grafting rate 60%), and then add tetramethylguanidine in an equimolar amount relative to the polymer. After reacting at 35 °C for 12 hours, perform freeze-drying to obtain an alkyl-chain modified two-dimensional polycarboxylic acid polymer.

[0057] (4)Polymer coating

[0058] Prepare a 1% aqueous solution of the above alkyl-chain modified two-dimensional polycarboxylic acid polymer, immerse the PC board in the solution for 10 min, then remove the substrate and dry for 30 s. Subsequently, wash the surface of the substrate with deionized water and ethanol, and then dry it in an oven at 45 °C for 24 hours to obtain the polymer coating.

[0059] Example 2

[0060] Prepare the modified two-dimensional polymer using the method of Example 1, with the difference that: the bromoalkane is 1-bromobutane (C4). Among them, the preparation of the coating is the same as that in Example 1.

[0061] Example 3

[0062] Prepare the modified two-dimensional polymer using the method of Example 1, with the difference that: the bromoalkane is 1-bromohexane (C6). Among them, the preparation of the coating is the same as that in Example 1.

[0063] Example 4

[0064] The modified two-dimensional polymer was prepared by the method of Example 1, except that the bromoalkane was 1-bromooctane (C8). Among them, the preparation of the coating was the same as that of Example 1.

[0065] Example 5

[0066] The modified two-dimensional polymer was prepared by the method of Example 1, except that the bromoalkane was 1-bromononane (C9). Among them, the preparation of the coating was the same as that of Example 1.

[0067] Example 6

[0068] The modified two-dimensional polymer was prepared by the method of Example 3, except that the molar addition amount of 1-bromohexane (C6) was 0.2 times that of the two-dimensional polymer (grafting rate 20%). Among them, the preparation of the coating was the same as that of Example 3.

[0069] Example 7

[0070] The modified two-dimensional polymer was prepared by the method of Example 6, except that the molar addition amount of 1-bromohexane (C6) was 0.3 times that of the two-dimensional polymer (grafting rate 30%). Among them, the preparation of the coating was the same as that of Example 3.

[0071] Example 8

[0072] The modified two-dimensional polymer was prepared by the method of Example 6, except that the molar addition amount of 1-bromohexane (C6) was 0.4 times that of the two-dimensional polymer (grafting rate 40%). Among them, the preparation of the coating was the same as that of Example 3.

[0073] Example 9

[0074] The modified two-dimensional polymer was prepared by the method of Example 6, except that the molar addition amount of 1-bromohexane (C6) was 0.7 times that of the two-dimensional polymer (grafting rate 70%). Among them, the preparation of the coating was the same as that of Example 3.

[0075] Example 10

[0076] The modified two-dimensional polymer was prepared by the method of Example 6, except that the molar addition amount of 1-bromohexane (C6) was 0.8 times that of the two-dimensional polymer (grafting rate 80%). Among them, the preparation of the coating was the same as that of Example 3.

[0077] Comparative Example 1

[0078] The coating was prepared by the method of Example 1, except that the polymer was an unmodified two-dimensional polycarboxylate and other conditions remained unchanged.

[0079] The performance of the coatings prepared in each example and comparative example was tested, and the results are shown in Table 1.

[0080]

[0081] Hydrophobic angle test method: The static contact angle of the coating was measured by a JGW-360a contact angle meter. The volume of the test liquid was 2 μL, the test environment was 24 ± 1 °C, and the relative humidity was 45 ± 1%. Five values of the water droplet contact angle were measured and the average value was taken.

[0082] Abrasion test with sandpaper: After the water fumigation test, a 35-gram weight was tied to a cork ruler, and the coated side of the sample was closely attached to the sandpaper. The ruler used to fix the sample was moved along the sandpaper for 10 cm, 5 times in total.

[0083] From the data in Table 1, it can be seen that compared with Comparative Example 1, the polymer coating prepared by the present invention exhibits excellent anti-fogging effect and scratch resistance. From the data of Examples 1 to 5, it can be seen that as the number of carbon atoms of the modified alkyl chain reagent increases, the anti-fogging performance of the coating gradually decreases, while the scratch resistance gradually increases; from the data of Examples 6 to 10, it can be seen that as the grafting rate of the modified alkyl chain reagent increases, the anti-fogging performance of the coating gradually decreases, while the scratch resistance gradually increases.

[0084] The coating prepared in Example 3 of the present invention was used for the hot fog experiment, as Figure 3 shown. It can be seen from Figure 3 that after the hot fog treatment, the glass containing the coating of the present invention still has a clear vision, while the glass without the coating is significantly fogged, that is, the coating of the present invention has an excellent anti-fogging effect.

[0085] Figure 4 Figure

[21] is a microscopic morphology diagram of the coating after scratching. Among them, (1) is the coating prepared in Comparative Example 1, (2) is the coating prepared in Example 1, and (3) is the coating prepared in Example 3. It can be seen from the figure that the coating in Comparative Example 1 has obvious scratches, the coating in Example 1 has slight scratches, and the coating in Example 3 has basically no scratch marks. It can be seen that the coating prepared by the present invention has excellent scratch resistance.

Claims

1. A preparation method of a two-dimensional amphiphilic polymer coating, characterized in that: The 5-(4-vinylbenzyloxy)isophthalic acid monomer is cationized by tetramethylguanidine and then a two-dimensional polycarboxylic acid product is obtained through a polymerization reaction; the two-dimensional polycarboxylic acid product is subjected to an esterification reaction with a monohaloalkane to obtain the product; The 5-(4-vinylbenzyloxy)isophthalic acid monomer is obtained by a substitution reaction of dimethyl 5-hydroxyisophthalate and 4-vinylbenzyl chloride to obtain the dimethyl 5-(4-vinylbenzyloxy)isophthalate monomer, and then the dimethyl 5-(4-vinylbenzyloxy)isophthalate monomer is prepared through hydrolysis and acidification reactions.

2. The preparation method of a two-dimensional amphiphilic polymer coating according to claim 1, characterized in that: The polymerization reaction is carried out under a redox radical initiation system.

3. A method for preparing a two-dimensional amphiphilic polymer coating according to claim 2, characterized in that: The molar addition amount of tetramethylguanidine is 0.8 to 1.2 times that of the 5-(4-vinylbenzyloxy)isophthalic acid monomer; The reducing agent in the redox radical initiation system is a thiosulfate, and the oxidizing agent is a persulfate; The molar addition amount of the thiosulfate is 0.03 to 0.08 times that of the 5-(4-vinylbenzyloxy)isophthalic acid monomer; The molar addition amount of the persulfate is 0.04 to 0.09 times that of the 5-(4-vinylbenzyloxy)isophthalic acid monomer; The thiosulfate is sodium thiosulfate; The persulfate is potassium persulfate.

4. The preparation method of a two-dimensional amphiphilic polymer coating according to claim 2 or 3, characterized in that: After adding the reducing agent and reacting for 0.5 to 2 h, the oxidizing agent is added and the reaction continues for 6 to 24 h.

5. A method for preparing a two-dimensional amphiphilic polymer coating according to claim 1, characterized in that: The molar addition amount of the monohaloalkane is 20% to 80% of the two-dimensional polycarboxylic acid product; The number of carbon atoms in the alkyl chain of the monohaloalkane is 3 to 9; The halogen element in the monohaloalkane includes one of Cl, Br, and I.

6. A method for preparing a two-dimensional amphiphilic polymer coating according to claim 5, characterized in that: The molar addition amount of the monohaloalkane is 30% to 70% of the two-dimensional polycarboxylic acid product; The number of carbon atoms in the alkyl chain of the monohaloalkane is 4 to 8.

7. The preparation method of a two-dimensional amphiphilic polymer coating according to claim 1, 5 or 6, characterized in that: The conditions for the esterification reaction are: using tetramethylguanidine as a catalyst, the temperature is 20 to 45 °C, and the time is 10 to 15 h.

8. A two-dimensional amphiphilic polymer coating, characterized in that: Prepared by the method according to any one of claims 1 to 7.

9. A method for preparing a polymer coating, characterized in that: The substrate is immersed in the two-dimensional amphiphilic polymer coating solution according to claim 8, and then surface drying treatment is carried out to obtain the product.

10. A polymer coating, characterized in that: Prepared by the method according to claim 9.

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