Exposed polymer waterproof coating and preparation method thereof

Abstract

The invention provides an exposed polymer waterproof coating and a preparation method thereof. The waterproof coating is prepared from the following raw materials in parts by weight: 60 to 80 parts of bisphenol A epoxy resin, 10 to 15 parts of trimethylolpropane, 2 to 6 parts of sodium dodecyl benzene sulfonate, 20 to 30 parts of pigment, 5 to 15 parts of dimethyl carbonate, 5 to 15 parts of cyclohexanone, 20 to 30 parts of nano silicon dioxide solution, 4 to 8 parts of silane coupling agent, 15 to 25 parts of polyaniline, 6 to 10 parts of titanium dioxide and 10 to 15 parts of polyimide. The coating comprises the following components in parts by weight: 10-20 parts of carbon black, 0.5-1.5 parts of a defoaming agent, 0.5-1.5 parts of an oxidizing agent, 0.5-1.5 parts of a weather-resistant auxiliary agent and 25-35 parts of water. A paint film formed by the waterproof paint has good corrosion resistance, heat resistance and water resistance.

Description

Technical Field

[0001] The invention relates to the technical field of waterproof coatings, and in particular to an exposed polymer waterproof coating and a preparation method thereof. Background Art

[0002] ‌Exposed polymer waterproof coatings‌ refer to those waterproof coatings that are exposed to the natural environment for a long time after construction and do not require an additional protective layer. Such coatings are usually used in concrete roofs, color steel tile roofs, solar roofs, etc. They have excellent weather resistance, acid and alkali resistance, high strength and high elongation, and can be used for a long time under normal natural conditions without aging or damage.‌ The outdoor waterproof coatings in the existing general technology mainly include: acrylic, polyurethane reactive, asphalt materials, etc. Acrylic waterproof coatings dry slowly, do not have early rain resistance, and are easily damaged by rain, humid air, etc. Polyurethane reactive waterproof coatings have poor aging resistance and UV resistance. Oily materials such as asphalt cause serious damage to the environment and have poor weather resistance. Therefore, it is necessary to design a waterproof coating that can be used outdoors and has good comprehensive properties such as weather resistance and corrosion resistance. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides an exposed polymer waterproof coating and a preparation method thereof.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present application discloses an exposed polymer waterproof coating, the components of which include the following raw materials in parts by weight: 60-80 parts of bisphenol A epoxy resin, 10-15 parts of trimethylolpropane, 2-6 parts of sodium dodecylbenzene sulfonate, 20-30 parts of pigment, 5-15 parts of dimethyl carbonate, 5-15 parts of cyclohexanone, 20-30 parts of nano silicon dioxide solution, 4-8 parts of silane coupling agent, 15-25 parts of polyaniline, 6-10 parts of titanium dioxide, 10-15 parts of polyimide, 10-20 parts of carbon black, 0.5-1.5 parts of defoaming agent, 0.5-1.5 parts of oxidant, 0.5-1.5 parts of weathering agent and 25-35 parts of water.

[0005] Preferably, the components of the waterproof coating include the following raw materials in parts by weight: 70 parts of bisphenol A epoxy resin, 12 parts of trimethylolpropane, 4 parts of sodium dodecylbenzene sulfonate, 25 parts of pigment, 10 parts of dimethyl carbonate, 10 parts of cyclohexanone, 25 parts of nano-silica solution, 6 parts of silane coupling agent, 20 parts of polyaniline, 8 parts of titanium dioxide, 12 parts of polyimide, 15 parts of carbon black, 1 part of defoaming agent, 1 part of oxidant, 1 part of weathering agent and 30 parts of water.

[0006] Preferably, the mass ratio of dimethyl carbonate to cyclohexanone is 1:1.

[0007] Preferably, the pigment consists of zinc phosphate and zinc yellow in a mass ratio of 1:1.

[0008] Preferably, the preparation method of the nano-silica solution is as follows: weigh 1-2 parts of coupling agent, 2-4 parts of methyltriethoxysilane, 4-8 parts of anhydrous ethanol and 0.4-0.8 parts of catalyst in proportion, mix them evenly at 65-70° C., and keep warm for 4 hours to obtain a nano-silica solution.

[0009] Preferably, the weathering agent is one or more of potassium persulfate, sodium nitrite, zinc dihydrogen phosphate, potassium dichromate, and ammonium molybdate, and the oxidant is ammonium persulfate.

[0010] The present application also discloses a method for preparing an exposed polymer waterproof coating, which comprises the following steps: S1. Weigh polyaniline, sodium dodecylbenzene sulfonate, titanium dioxide, an oxidant and cyclohexanone in proportion, take 1 / 2 of the total weight of polyaniline, 1 / 4 of the total weight of cyclohexanone, sodium dodecylbenzene sulfonate, titanium dioxide and the oxidant and mix them under mechanical stirring for 3-5h for standby use; S2, weigh polyimide, carbon black, trimethylolpropane, and dimethyl carbonate in proportion and add them into a beaker, add the remaining polyaniline and 1 / 2 of the total weight of the silane coupling agent, ultrasonically disperse and mechanically stir at the same time, stop ultrasonic dispersion after 20-30 minutes, stir at a low speed of 50-100 r / min for 4-5 hours, and set aside; S3. Weigh the remaining material in proportion, mix it evenly with the materials obtained in steps S1 and S2, stir it at a mechanical speed of 700-750r / min for 35-40min, let it stand for 2h, transfer it to a planetary gravity mixer, gradually increase the speed from static to 1600r / min for degassing, and finally adjust it to a suitable viscosity, filter it, and package it to obtain an exposed polymer waterproof coating.

[0011] Preferably, the stirring temperature in step S1 is 25-30°C.

[0012] The beneficial effects of the present invention are: Zinc yellow pigment hydrolyzes to form anionic complexes with hexavalent chromium as the main component, which forms insoluble heteropolyacid complexes with rust, making the metal surface passivated. 3+ Forming a strong complex Fe[Zn 3 It can also complex with the hydroxyl groups in the paint to chemically bond the pigment, paint base and substrate, thereby improving the wet adhesion and impermeability of the coating.

[0013] The molecular structure of bisphenol A epoxy resin contains two or more epoxy groups, and both ends of its molecular bond are usually epoxy groups. Trimethylolpropane contains multiple epoxy groups. Bisphenol A epoxy resin and trimethylolpropane are easily chemically cross-linked after mixing, and cross-linked to form a mesh structure with different cross-linking point sizes, which is used to prepare coatings and improves the moisture and heat stability of the coating. Trimethylolpropane can give epoxy groups to nano-silicon dioxide solution, promote the formation of hydrogen bonds between nano-silicon dioxide solution and trimethylolpropane and substrate, enhance the interface adhesion ability, reduce the hydrophilicity of organic groups enriched on the surface of nano-silicon dioxide solution, and have good dispersibility in bisphenol A epoxy resin molecules. The coating formed by the prepared coating is more solid and dense. The trimethylolpropane-nano-silicon dioxide solution uniformly dispersed in the system increases the shielding function of the coating in the bisphenol A epoxy resin, reduces the diffusion channel of the corrosive medium, inhibits the corrosion reaction, and fully improves the corrosion resistance of the coating.

[0014] Titanium dioxide is embedded in the three-dimensional network structure of the polyaniline matrix chain, increasing the specific surface area of ​​polyaniline, thereby producing a strong interfacial bonding effect, which helps to form a more effective cross-linked network structure to enhance the electrical and corrosion resistance of the polyaniline molecules, thereby improving the antistatic and corrosion resistance of the coating formed by the coating.

[0015] The coating obtained by blending polyaniline and bisphenol A epoxy resin has good adhesion and dispersibility. There are many particle contact points between carbon black and polyaniline. The mixed system composed of carbon black and polyaniline forms different conductive networks. The coating formed by the prepared coating has good antistatic effect. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are 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 are within the scope of protection of the present invention.

[0017] Embodiment 1: The present embodiment discloses an exposed polymer waterproof coating, the components of which include the following raw materials in parts by weight: 60 parts of bisphenol A epoxy resin, 10 parts of trimethylolpropane, 2 parts of sodium dodecylbenzene sulfonate, 20 parts of pigment, 5 parts of dimethyl carbonate, 5 parts of cyclohexanone, 20 parts of nano-silica solution, 4 parts of silane coupling agent, 15 parts of polyaniline, 6 parts of titanium dioxide, 10 parts of polyimide, 10 parts of carbon black, 0.5 parts of defoaming agent, 0.5 parts of ammonium persulfate, 0.5 parts of weathering agent and 25 parts of water.

[0018] The pigment is composed of zinc phosphate and zinc yellow in a mass ratio of 1:1.

[0019] The preparation method of the nano-silica solution is as follows: weigh 1 part of a coupling agent, 2 parts of methyltriethoxysilane, 4 parts of anhydrous ethanol and 0.4 parts of a catalyst according to a certain proportion, mix them evenly at 65° C., and keep them warm for 4 hours to obtain a nano-silica solution.

[0020] The weathering agent is composed of potassium persulfate and sodium nitrite in a mass ratio of 1:1.

[0021] This embodiment also discloses a method for preparing an exposed polymer waterproof coating, which comprises the following steps: S1. Weigh polyaniline, sodium dodecylbenzene sulfonate, titanium dioxide, ammonium persulfate and cyclohexanone in proportion, take 1 / 2 of the total weight of polyaniline, 1 / 4 of the total weight of cyclohexanone, sodium dodecylbenzene sulfonate, titanium dioxide and ammonium persulfate, and mix them mechanically under 25° C. for 3 h, and set aside; S2, weigh polyimide, carbon black, trimethylolpropane, and dimethyl carbonate in proportion and add them into a beaker, add the remaining polyaniline and 1 / 2 of the total weight of the silane coupling agent, ultrasonically disperse and mechanically stir at the same time, stop ultrasonic dispersion after 20 minutes, stir at a low speed of 50r / min for 4 hours, and set aside; S3. Weigh the remaining materials in proportion, mix them evenly with the materials obtained in steps S1 and S2, stir them at a mechanical speed of 700 r / min for 35 min, let them stand for 2 h, transfer them to a planetary gravity mixer, gradually increase the speed from static to 1600 r / min for degassing, and finally adjust to a suitable viscosity, filter, and package to obtain an exposed polymer waterproof coating.

[0022] Embodiment 2: The present embodiment discloses an exposed polymer waterproof coating, the components of which include the following raw materials in parts by weight: 80 parts of bisphenol A epoxy resin, 15 parts of trimethylolpropane, 6 parts of sodium dodecylbenzene sulfonate, 30 parts of pigment, 15 parts of dimethyl carbonate, 15 parts of cyclohexanone, 30 parts of nano-silica solution, 8 parts of silane coupling agent, 25 parts of polyaniline, 10 parts of titanium dioxide, 15 parts of polyimide, 20 parts of carbon black, 1.5 parts of defoaming agent, 1.5 parts of ammonium persulfate, 1.5 parts of weathering agent and 35 parts of water.

[0023] The pigment is composed of zinc phosphate and zinc yellow in a mass ratio of 1:1.

[0024] The preparation method of the nano-silica solution is as follows: weigh 2 parts of a coupling agent, 4 parts of methyltriethoxysilane, 8 parts of anhydrous ethanol and 0.8 parts of a catalyst according to a certain proportion, mix them evenly at 70° C., and keep them warm for 4 hours to obtain a nano-silica solution.

[0025] The weathering agent is composed of potassium persulfate and zinc dihydrogen phosphate in a mass ratio of 1:1.

[0026] This embodiment also discloses a method for preparing an exposed polymer waterproof coating, which comprises the following steps: S1. Weigh polyaniline, sodium dodecylbenzene sulfonate, titanium dioxide, ammonium persulfate and cyclohexanone in proportion, take 1 / 2 of the total weight of polyaniline, 1 / 4 of the total weight of cyclohexanone, sodium dodecylbenzene sulfonate, titanium dioxide and ammonium persulfate, stir and mix them mechanically at 30° C. for 5 hours, and set aside; S2, weigh polyimide, carbon black, trimethylolpropane, and dimethyl carbonate in proportion and add them into a beaker, add the remaining polyaniline and 1 / 2 of the total weight of the silane coupling agent, ultrasonically disperse and mechanically stir at the same time, stop ultrasonic dispersion after 30 minutes, stir at a low speed of 100 r / min for 5 hours, and set aside; S3. Weigh the remaining materials in proportion, mix them evenly with the materials obtained in steps S1 and S2, stir them at a mechanical speed of 750 r / min for 40 min, let them stand for 2 h, transfer them to a planetary gravity mixer, gradually increase the speed from static to 1600 r / min for degassing, and finally adjust to a suitable viscosity, filter, and package to obtain an exposed polymer waterproof coating.

[0027] Embodiment 3: The present embodiment discloses an exposed polymer waterproof coating, the components of which include the following raw materials in parts by weight: 70 parts of bisphenol A epoxy resin, 12 parts of trimethylolpropane, 4 parts of sodium dodecylbenzene sulfonate, 25 parts of pigment, 10 parts of dimethyl carbonate, 10 parts of cyclohexanone, 25 parts of nano-silica solution, 6 parts of silane coupling agent, 20 parts of polyaniline, 8 parts of titanium dioxide, 12 parts of polyimide, 15 parts of carbon black, 1 part of defoaming agent, 1 part of ammonium persulfate, 1 part of weathering agent and 30 parts of water.

[0028] The pigment is composed of zinc phosphate and zinc yellow in a mass ratio of 1:1.

[0029] The preparation method of the nano-silica solution is as follows: weigh 1-2 parts of a coupling agent, 3 parts of methyltriethoxysilane, 6 parts of anhydrous ethanol and 0.6 parts of a catalyst according to a certain proportion, mix them evenly at 68° C., and keep them warm for 4 hours to obtain a nano-silica solution.

[0030] The weathering agent is composed of sodium peroxynitrite and zinc dihydrogen phosphate in a mass ratio of 1:1.

[0031] This embodiment also discloses a method for preparing an exposed polymer waterproof coating, which comprises the following steps: S1. Weigh polyaniline, sodium dodecylbenzene sulfonate, titanium dioxide, ammonium persulfate and cyclohexanone in proportion, take 1 / 2 of the total weight of polyaniline, 1 / 4 of the total weight of cyclohexanone, sodium dodecylbenzene sulfonate, titanium dioxide and ammonium persulfate, stir and mix them mechanically at 28° C. for 4 hours, and set aside; S2, weigh polyimide, carbon black, trimethylolpropane, and dimethyl carbonate in proportion and add them into a beaker, add the remaining polyaniline and 1 / 2 of the total weight of the silane coupling agent, ultrasonically disperse and mechanically stir at the same time, stop ultrasonic dispersion after 25 minutes, stir at a low speed of 80 r / min for 4.5 hours, and set aside; S3. Weigh the remaining materials in proportion, mix them evenly with the materials obtained in steps S1 and S2, stir them at a mechanical speed of 730 r / min for 38 min, let them stand for 2 h, transfer them to a planetary gravity mixer, gradually increase the speed from static to 1600 r / min for degassing, and finally adjust to a suitable viscosity, filter, and package to obtain an exposed polymer waterproof coating.

[0032] Comparative Example 1: An exposed polymer waterproof coating, the exposed polymer waterproof coating is different from Example 3 only in that bisphenol A epoxy resin is not added.

[0033] Comparative Example 2: An exposed polymer waterproof coating, the exposed polymer waterproof coating differs from Example 3 only in that trimethylolpropane is not added.

[0034] Comparative Example 3: An exposed polymer waterproof coating, the exposed polymer waterproof coating is different from Example 3 only in that sodium dodecylbenzene sulfonate is not added.

[0035] Comparative Example 4: An exposed polymer waterproof coating, the exposed polymer waterproof coating differs from Example 3 only in that no dimethyl carbonate is added.

[0036] Comparative Example 5: An exposed polymer waterproof coating, the exposed polymer waterproof coating differs from Example 3 only in that cyclohexanone is not added.

[0037] Comparative Example 6: An exposed polymer waterproof coating, the exposed polymer waterproof coating differs from Example 3 only in that no pigment is added.

[0038] Comparative Example 7: An exposed polymer waterproof coating, the exposed polymer waterproof coating is different from Example 3 only in that no nano-silicon dioxide solution is added.

[0039] Comparative Example 8: An exposed polymer waterproof coating, the exposed polymer waterproof coating differs from Example 3 only in that no polyaniline is added.

[0040] Comparative Example 9: An exposed polymer waterproof coating, the exposed polymer waterproof coating differs from Example 3 only in that titanium dioxide is not added.

[0041] Comparative Example 10: An exposed polymer waterproof coating, the exposed polymer waterproof coating differs from Example 3 only in that no polyimide is added.

[0042] Comparative Example 11: An exposed polymer waterproof coating, the exposed polymer waterproof coating differs from Example 3 only in that no carbon black is added.

[0043] Comparative Example 12: An exposed polymer waterproof coating, the exposed polymer waterproof coating is different from Example 3 only in that the pigment is composed of zinc phosphate only.

[0044] Comparative Example 13: An exposed polymer waterproof coating, the exposed polymer waterproof coating is different from Example 3 only in that the pigment consists of zinc yellow only.

[0045] The waterproof coating product's 30d resistance to 15% sulfuric acid and 15% sodium hydroxide was tested according to GB / T1763-1979.

[0046] The heat resistance of waterproof coating products is measured according to GB / T1735-1979.

[0047] The 7d water resistance test of waterproof coating products is carried out according to GB / T1733-1993.

[0048] The waterproof coatings obtained in the above Examples 1-3 and Comparative Examples 1-13 were subjected to performance tests to measure the comprehensive performance of the waterproof coatings. The results are shown in Table 1.

[0049] Table 1 Performance parameters of the waterproof coatings obtained in Examples 1-3 and Comparative Examples 1-14 Group 30d resistance to 15% sulfuric acid 30d resistance to 15% sodium hydroxide 230℃ heat resistance test for 24h 7d immersion test water resistance Example 1 Paint film intact Paint film intact Paint film intact Paint film intact Example 2 Paint film intact Paint film intact Paint film intact Paint film intact Example 3 Paint film intact Paint film intact Paint film intact Paint film intact Comparative Example 1 The paint film is locally rusted The paint film is locally rusted The paint film is softened locally Obvious rust on the substrate Comparative Example 2 The paint film is locally rusted The paint film is locally rusted The paint film is softened locally Obvious rust on the substrate Comparative Example 3 Paint film intact Paint film intact Paint film intact Paint film intact Comparative Example 4 Slight rust on the paint film Slight rust on the paint film The paint film is slightly softened locally Paint film intact Comparative Example 5 Slight rust on the paint film Slight rust on the paint film The paint film is slightly softened locally Paint film intact Comparative Example 6 Paint film intact Paint film intact Paint film intact Slight rust on the substrate Comparative Example 7 The paint film is locally rusted The paint film is locally rusted Paint film intact Obvious rust on the substrate Comparative Example 8 Slight rust on the paint film Slight rust on the paint film The paint film is slightly softened locally Paint film intact Comparative Example 9 Slight rust on the paint film Slight rust on the paint film The paint film is slightly softened locally Paint film intact Comparative Example 10 Slight rust on the paint film Slight rust on the paint film The paint film is slightly softened locally Paint film intact Comparative Example 11 Paint film intact Paint film intact Paint film intact Paint film intact Comparative Example 12 Slight rust on the paint film Slight rust on the paint film The paint film is slightly softened locally Paint film intact Comparative Example 13 Slight rust on the paint film Slight rust on the paint film The paint film is slightly softened locally Paint film intact From Table 1, we can see that: Examples 1-3 are only changes in the proportions of each component and parameters in the preparation method, and the effects on the acid and alkali resistance, water resistance and heat resistance of the paint film are negligible.

[0050] The addition of bisphenol A epoxy resin, trimethylolpropane, and nano-silica solution has no significant effect on the corrosion resistance and water resistance of the paint film, and the addition of bisphenol A epoxy resin and trimethylolpropane has no significant effect on the heat stability of the paint film.

[0051] No addition of dimethyl carbonate, cyclohexanone, polyaniline and titanium dioxide has a slight effect on the corrosion resistance and heat resistance of the paint film. No addition of pigment or nano-silica solution has a slight effect on the water resistance of the paint film.

[0052] In summary, zinc yellow pigment hydrolyzes to form anionic complexes with hexavalent chromium as the main component, and forms insoluble heteropolyacid complexes with rust, which passivates the metal surface. Zinc phosphate pigment forms a strong complex Fe[Zn3(PO4)] precipitation with Fe3+ on the metal surface, inhibiting the anodic reaction, and can also complex with the hydroxyl group in the paint to chemically bond the pigment, paint base and substrate, thereby improving the wet adhesion and impermeability of the coating.

[0053] The molecular structure of bisphenol A epoxy resin contains two or more epoxy groups, and both ends of its molecular bond are usually epoxy groups. Trimethylolpropane contains multiple epoxy groups. Bisphenol A epoxy resin and trimethylolpropane are easily chemically cross-linked after mixing, and cross-linked to form a mesh structure with different cross-linking point sizes, which is used to prepare coatings and improves the moisture and heat stability of the coating. Trimethylolpropane can give epoxy groups to nano-silicon dioxide solution, promote the formation of hydrogen bonds between nano-silicon dioxide solution and trimethylolpropane and substrate, enhance the interface adhesion ability, reduce the hydrophilicity of organic groups enriched on the surface of nano-silicon dioxide solution, and have good dispersibility in bisphenol A epoxy resin molecules. The coating formed by the prepared coating is more solid and dense. The trimethylolpropane-nano-silicon dioxide solution uniformly dispersed in the system increases the shielding function of the coating in the bisphenol A epoxy resin, reduces the diffusion channel of the corrosive medium, inhibits the corrosion reaction, and fully improves the corrosion resistance of the coating.

[0054] Titanium dioxide is embedded in the three-dimensional network structure of the polyaniline matrix chain, increasing the specific surface area of ​​polyaniline, thereby producing a strong interfacial bonding effect, which helps to form a more effective cross-linked network structure to enhance the electrical and corrosion resistance of the polyaniline molecules, thereby improving the antistatic and corrosion resistance of the coating formed by the coating.

[0055] The coating obtained by blending polyaniline and bisphenol A epoxy resin has good adhesion and dispersibility. There are many particle contact points between carbon black and polyaniline. The mixed system composed of carbon black and polyaniline forms different conductive networks. The coating formed by the prepared coating has good antistatic effect.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An exposed polymer waterproof coating, characterized in that: The waterproof coating comprises the following raw materials in parts by weight: 60-80 parts of bisphenol A epoxy resin, 10-15 parts of trimethylolpropane, 2-6 parts of sodium dodecylbenzene sulfonate, 20-30 parts of pigment, 5-15 parts of dimethyl carbonate, 5-15 parts of cyclohexanone, 20-30 parts of nano silicon dioxide solution, 4-8 parts of silane coupling agent, 15-25 parts of polyaniline, 6-10 parts of titanium dioxide, 10-15 parts of polyimide, 10-20 parts of carbon black, 0.5-1.5 parts of defoaming agent, 0.5-1.5 parts of oxidant, 0.5-1.5 parts of weathering aid and 25-35 parts of water.

2. The exposed polymer waterproof coating according to claim 1, characterized in that: The waterproof coating comprises the following raw materials in parts by weight: 70 parts of bisphenol A epoxy resin, 12 parts of trimethylolpropane, 4 parts of sodium dodecylbenzene sulfonate, 25 parts of pigment, 10 parts of dimethyl carbonate, 10 parts of cyclohexanone, 25 parts of nano silicon dioxide solution, 6 parts of silane coupling agent, 20 parts of polyaniline, 8 parts of titanium dioxide, 12 parts of polyimide, 15 parts of carbon black, 1 part of defoaming agent, 1 part of oxidant, 1 part of weathering aid and 30 parts of water.

3. The exposed polymer waterproof coating according to claim 1 or 2, characterized in that: The mass ratio of dimethyl carbonate to cyclohexanone is 1:

1.

4. The exposed polymer waterproof coating according to claim 1 or 2, characterized in that: The pigment consists of zinc phosphate and zinc yellow in a mass ratio of 1:

1.

5. The exposed polymer waterproof coating according to claim 1 or 2, characterized in that: The preparation method of the nano-silica solution is as follows: weigh 1-2 parts of a coupling agent, 2-4 parts of methyltriethoxysilane, 4-8 parts of anhydrous ethanol and 0.4-0.8 parts of a catalyst according to proportion, mix them evenly at 65-70° C., and keep them warm for 4 hours to obtain a nano-silica solution.

6. The exposed polymer waterproof coating according to claim 1 or 2, characterized in that: The weathering agent is one or more of potassium persulfate, sodium nitrite, zinc dihydrogen phosphate, potassium dichromate, and ammonium molybdate, and the oxidant is ammonium persulfate.

7. A method for preparing an exposed polymer waterproof coating according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: S1. Weigh polyaniline, sodium dodecylbenzene sulfonate, titanium dioxide, an oxidant and cyclohexanone in proportion, take 1 / 2 of the total weight of polyaniline, 1 / 4 of the total weight of cyclohexanone, sodium dodecylbenzene sulfonate, titanium dioxide and the oxidant and mix them under mechanical stirring for 3-5h for standby use; S2, weigh polyimide, carbon black, trimethylolpropane, and dimethyl carbonate in proportion and add them into a beaker, add the remaining polyaniline and 1 / 2 of the total weight of the silane coupling agent, ultrasonically disperse and mechanically stir at the same time, stop ultrasonic dispersion after 20-30 minutes, stir at a low speed of 50-100 r / min for 4-5 hours, and set aside; S3. Weigh the remaining material in proportion, mix it evenly with the materials obtained in steps S1 and S2, stir it at a mechanical speed of 700-750r / min for 35-40min, let it stand for 2h, transfer it to a planetary gravity mixer, gradually increase the speed from static to 1600r / min for degassing, and finally adjust it to a suitable viscosity, filter it, and package it to obtain an exposed polymer waterproof coating.

8. The method for preparing the exposed polymer waterproof coating according to claim 7, characterized in that: The stirring temperature in step S1 is 25-30°C.