Environment-friendly waterproof coating and preparation method thereof

Abstract

The invention relates to an environment-friendly waterproof coating and a preparation method thereof, and belongs to the technical field of water-based coatings. The environment-friendly waterproof coating is prepared by taking isophorone diisocyanate, polyether polyol, a catalyst, superfine calcium carbonate, bentonite, a coalescing agent and a self-made composite functional agent as raw materials, and is prepared by the following steps: firstly, dissolving isophorone diisocyanate, polyether polyol and the catalyst in an environment-friendly solvent, and stirring for reaction to prepare a polyurethane solution; crushing bentonite, dissolving the crushed bentonite, superfine calcium carbonate and a self-made composite functional agent in an environment-friendly solvent, and stirring and mixing at a high speed to prepare composite slurry; and finally, adding a coalescing agent and a polyurethane solution into the composite slurry, and stirring and mixing to prepare the environment-friendly waterproof coating. The solvent used in the preparation method is safe and environment-friendly, and the prepared environment-friendly waterproof coating is non-toxic, free of peculiar smell, bright in color and luster, good in wear resistance, good in waterproof performance and not prone to being corroded by acid and alkali.

Description

Technical Field

[0001] The present invention belongs to the technical field of water-based coatings, and in particular, relates to an environmentally friendly waterproof coating and a preparation method thereof. Background Art

[0002] The main raw materials of waterproof coatings include synthetic high molecular polymers, high molecular polymers and asphalt, high molecular polymers and cement, etc., which are processed into solvent-based, water-based or powder-based coatings by adding various additives, modified materials, filling materials, etc. With the development of society and the increasing attention to the environment, coatings containing VOCs are gradually being eliminated by the market and replaced by environmentally friendly coatings. Coatings made of polyurethane as raw material have the characteristics of good toughness, wide temperature resistance range, and excellent UV resistance. At present, they have become the most widely used film-forming materials in coatings.

[0003] Although the waterproof coating in the prior art can block the penetration of water molecules, the waterproof performance is not strong at the current stage due to the hydrophilicity of the waterproof coating itself. As time goes by, the aging of the waterproof coating may also cause deformation and shedding of the waterproof layer, affecting the waterproof performance of the coating film. Therefore, the research and development of waterproof coatings with higher durability, stronger waterproof performance, better mechanical properties (such as tensile strength, wear resistance) and better weather resistance to adapt to more complex and changeable application environments will be the main research direction in the future. Summary of the invention

[0004] The object of the present invention is to provide an environmentally friendly waterproof coating and a preparation method thereof, so as to solve the problems mentioned in the above background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An environmentally friendly waterproof coating, characterized in that it comprises the following raw materials in parts by weight: 10-15 parts of isophorone diisocyanate, 25-40 parts of polyether polyol, 0.1-0.3 parts of catalyst, 3.6-5 parts of ultrafine calcium carbonate, 2-3 parts of bentonite, 1-2.5 parts of film-forming aid, and 1.6-2.4 parts of composite functional agent;

[0007] A method for preparing an environmentally friendly waterproof coating comprises the following steps:

[0008] The first step: weighing the raw materials according to the mass proportions of isophorone diisocyanate 10-15 parts, polyether polyol 25-40 parts, catalyst 0.1-0.3 parts, ultrafine calcium carbonate 3.6-5 parts, bentonite 2-3 parts, film-forming aid 1-2.5 parts, composite functional agent 1.6-2.4 parts, dissolving isophorone diisocyanate, polyether polyol and catalyst with an environmentally friendly solvent and stirring to react to prepare a polyurethane solution;

[0009] Step 2: Dissolve the bentonite together with ultrafine calcium carbonate and composite functional agent in an environmentally friendly solvent and stir at high speed for 20-30 minutes to obtain a composite slurry;

[0010] Step 3: Add film-forming aid to the composite slurry obtained in the second step, stir and mix at high speed for 30 minutes, then add the polyurethane solution obtained in the first step to the composite slurry, keep stirring at the same speed for 30-45 minutes to obtain an environmentally friendly waterproof coating.

[0011] Furthermore, the polyether polyol is one of polyethylene glycol and polytetrahydrofuran diol.

[0012] Furthermore, the catalyst is dibutyltin dilaurate.

[0013] Furthermore, the particle size of the ultrafine calcium carbonate is less than 20-40 nm.

[0014] Furthermore, the film-forming aid is dipropylene glycol butyl ether.

[0015] Furthermore, the environmentally friendly solvent is one of propylene glycol methyl ether acetate and propylene glycol butyl ether acetate.

[0016] Furthermore, the temperature condition of the reaction in the first step is 80-100°C.

[0017] Furthermore, the rotation speed condition of the high-speed stirring in the second step is 800-100r / min.

[0018] Furthermore, the rotation speed condition of high-speed stirring in the third step is 400-600r / min.

[0019] Further, the method is prepared by the following steps:

[0020] Step 1: Mix phloroglucinol, chloroform and potassium hydroxide solution in a three-necked flask, install a condenser and a thermometer, start magnetic stirring, and react at a temperature of 65-70°C for 1 hour. After the reaction is completed, remove the solvent by rotary evaporation, adjust the pH of the remaining liquid to below 3 with hydrochloric acid, and extract with ether. After separating the organic layer with a separatory funnel, rotary evaporation is performed to obtain intermediate 1;

[0021] Step 2: Mix the intermediate 1, 2,2,2-trifluoroethanol, potassium carbonate solution and dimethyl sulfoxide in a three-necked flask, install a condenser and a thermometer, start magnetic stirring, and react at a temperature of 60-80°C for 3-4h. After the reaction is completed, rotary evaporation is performed to obtain the intermediate 2;

[0022] Step 3: Mix the intermediate 2, diethyl phosphite, 3-aminopropyltriethoxysilane and citric acid in a three-necked flask, start magnetic stirring, and react at room temperature for 2-3 hours. After the reaction is completed, rotary evaporate to obtain the composite functional agent;

[0023] Furthermore, the potassium hydroxide solution used in step 1 is a 30% by mass potassium hydroxide aqueous solution, and the amount ratio of phloroglucinol, chloroform and potassium hydroxide solution used is 0.1 mol: 20-30 mL: 35-40 mL.

[0024] Furthermore, the potassium carbonate solution used in step 2 is a 30% by mass potassium carbonate aqueous solution, and the amount ratio of the intermediate 1, 2,2,2-trifluoroethanol, potassium carbonate solution, and dimethyl sulfoxide used is 0.08 mol: 0.24-0.3 mol: 130 mL: 30-40 mL.

[0025] Furthermore, the amount ratio of intermediate 2, diethyl phosphite, 3-aminopropyltriethoxysilane and citric acid used in step 3 is 0.06 mol: 0.06 mol: 0.06 mol: 0.006-0.01 mol.

[0026] Beneficial effects of the present invention:

[0027] 1) The present invention uses isophorone diisocyanate, polyether polyol, catalyst, ultrafine calcium carbonate, bentonite, film-forming aid, and self-made composite functional agent as raw materials to prepare an environmentally friendly waterproof coating. The present invention first dissolves isophorone diisocyanate, polyether polyol and catalyst with an environmentally friendly solvent and stirs the reaction to prepare a polyurethane solution, then grinds the bentonite and dissolves it with ultrafine calcium carbonate and the self-made composite functional agent with an environmentally friendly solvent and stirs and mixes at high speed to prepare a composite slurry, and finally adds the film-forming aid and the polyurethane solution to the composite slurry and stirs and mixes to prepare an environmentally friendly waterproof coating; the solvent used in the preparation method of the present invention is safe and environmentally friendly, and ultrafine calcium carbonate is used in the preparation process, and the prepared coating is smooth and wear-resistant.

[0028] 2) The present invention uses phloroglucinol and chloroform as raw materials, undergoes a Reimer-Tiemann reaction under alkaline conditions to obtain an intermediate 1, then undergoes a Williamson reaction between the intermediate 1 and 2,2,2-trifluoroethanol under alkaline conditions to obtain an intermediate 2, and finally undergoes a Kabachnik-Fields reaction between the intermediate 2 and 3-aminopropyltriethoxysilane and diethyl phosphite to obtain a composite functional agent; the composite functional agent of the present invention contains a large number of carbon-fluorine bonds, which have strong polarity and can repel water molecules. Therefore, the environmentally friendly coating prepared by adding the composite functional agent of the present invention has good Good hydrophobicity. In addition, these carbon-fluorine bonds in the composite functional agent are stable and not easy to break, have good acid and alkali resistance, and are not easily affected by external environmental factors. The composite functional agent of the present invention also has a phosphate structure. The free radicals released by these phosphate groups during combustion can capture the burning hydroxyl radicals and hydrogen radicals, block the chain reaction of combustion, and form a dense protective carbon layer to isolate the combustible base layer from external oxygen. Therefore, the composite functional agent of the present invention also has good flame retardancy. Not only that, the organosilicon structure in the composite functional agent of the present invention can also play a flame retardant effect, and has good weather resistance and is not easy to decompose, which greatly improves the stability of the composite functional agent.

[0029] 3) The preparation method of the present invention is simple and environmentally friendly. The prepared environmentally friendly waterproof coating is non-toxic and odorless, has bright color, good wear resistance, hydrophobicity and stability, is not easily corroded by acids and alkalis, has flame retardant effects, and has good safety performance. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions 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 making creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] A composite functional agent is prepared by the following steps:

[0033] Step 1: 0.1 mol of phloroglucinol, 20 mL of chloroform, and 35 mL of a 30% potassium hydroxide solution were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 65°C for 1 hour. After the reaction was completed, the solvent was removed by rotary evaporation, and the pH of the remaining liquid was adjusted to below 3 with hydrochloric acid, and extracted with ether. After the organic layer was separated with a separatory funnel, the intermediate 1 was obtained by rotary evaporation;

[0034] Step 2: 0.08 mol of intermediate 1, 0.24 mol of 2,2,2-trifluoroethanol, 130 mL of 30% potassium carbonate solution, and 30 mL of dimethyl sulfoxide were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 60°C for 4 hours. After the reaction was completed, intermediate 2 was obtained by rotary evaporation;

[0035] Step 3: 0.06 mol of intermediate 2, 0.06 mol of diethyl phosphite, 0.06 mol of 3-aminopropyltriethoxysilane and 0.006 mol of citric acid were mixed in a three-necked flask, magnetic stirring was started, and the mixture was reacted at room temperature for 2 h. After the reaction was completed, a composite functional agent was obtained by rotary evaporation.

[0036] Example 2

[0037] A composite functional agent is prepared by the following steps:

[0038] Step 1: 0.1 mol of phloroglucinol, 25 mL of chloroform, and 37 mL of a 30% potassium hydroxide solution were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 67°C for 1 hour. After the reaction was completed, the solvent was removed by rotary evaporation, and the pH of the remaining liquid was adjusted to below 3 with hydrochloric acid, and extracted with ether. After the organic layer was separated with a separatory funnel, the intermediate 1 was obtained by rotary evaporation;

[0039] Step 2: 0.08 mol of intermediate 1, 0.27 mol of 2,2,2-trifluoroethanol, 130 mL of 30% potassium carbonate solution, and 35 mL of dimethyl sulfoxide were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 70°C for 3.5 hours. After the reaction was completed, intermediate 2 was obtained by rotary evaporation;

[0040] Step 3: 0.06 mol of intermediate 2, 0.06 mol of diethyl phosphite, 0.06 mol of 3-aminopropyltriethoxysilane and 0.008 mol of citric acid were mixed in a three-necked flask, magnetic stirring was started, and the mixture was reacted at room temperature for 2.5 h. After the reaction was completed, a composite functional agent was obtained by rotary evaporation.

[0041] Example 3

[0042] A composite functional agent is prepared by the following steps:

[0043] Step 1: 0.1 mol of phloroglucinol, 30 mL of chloroform, and 40 mL of a 30% potassium hydroxide solution were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 70°C for 1 hour. After the reaction was completed, the solvent was removed by rotary evaporation, and the pH of the remaining liquid was adjusted to below 3 with hydrochloric acid, and extracted with ether. After separating the organic layer with a separatory funnel, the intermediate 1 was obtained by rotary evaporation;

[0044] Step 2: 0.08 mol of intermediate 1, 0.3 mol of 2,2,2-trifluoroethanol, 130 mL of 30% potassium carbonate solution, and 40 mL of dimethyl sulfoxide were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 80°C for 3 hours. After the reaction was completed, intermediate 2 was obtained by rotary evaporation;

[0045] Step 3: Mix 0.06 mol of intermediate 2, 0.06 mol of diethyl phosphite, 0.06 mol of 3-aminopropyltriethoxysilane and 0.01 mol of citric acid in a three-necked flask, start magnetic stirring, and react at room temperature for 3 hours. After the reaction is completed, rotary evaporation is performed to obtain a composite functional agent.

[0046] Example 4

[0047] An environmentally friendly waterproof coating, characterized in that it comprises the following raw materials in parts by mass: 10 parts of isophorone diisocyanate, 25 parts of polyethylene glycol, 0.3 parts of dibutyltin dilaurate, 3.6 parts of ultrafine calcium carbonate, 3 parts of bentonite, 1 part of dipropylene glycol butyl ether, and 2.4 parts of the composite functional agent obtained in Example 1;

[0048] A method for preparing an environmentally friendly waterproof coating comprises the following steps:

[0049] The first step: weighing the raw materials by mass: 10 parts of isophorone diisocyanate, 25 parts of polyethylene glycol, 0.3 parts of dibutyltin dilaurate, 3.6 parts of ultrafine calcium carbonate, 3 parts of bentonite, 1 part of dipropylene glycol butyl ether, and 2.4 parts of the composite functional agent obtained in Example 1, dissolving isophorone diisocyanate, polyethylene glycol, and dibutyltin dilaurate with propylene glycol methyl ether acetate, and stirring the reaction at a temperature of 80°C to prepare a polyurethane solution;

[0050] Step 2: Dissolve the crushed bentonite together with the ultrafine calcium carbonate and the composite functional agent obtained in Example 1 with propylene glycol methyl ether acetate, and stir for 30 minutes at a speed of 800 r / min to obtain a composite slurry, wherein the ultrafine calcium carbonate used in this step has a particle size of 20-40 nm;

[0051] Step 3: Add dipropylene glycol butyl ether to the composite slurry obtained in the second step, stir and mix at a speed of 400 r / min for 30 minutes, then add the polyurethane solution obtained in the first step to the composite slurry, keep stirring at the same speed for 45 minutes to obtain an environmentally friendly waterproof coating.

[0052] Example 5

[0053] An environmentally friendly waterproof coating, characterized in that it comprises the following raw materials in parts by mass: 12 parts of isophorone diisocyanate, 32 parts of polytetramethylene glycol, 0.1 parts of dibutyltin dilaurate, 5 parts of ultrafine calcium carbonate, 2 parts of bentonite, 2.5 parts of dipropylene glycol butyl ether, and 1.6 parts of the composite functional agent obtained in Example 2;

[0054] A method for preparing an environmentally friendly waterproof coating comprises the following steps:

[0055] Step 1: weighing each raw material according to the mass fraction, dissolving isophorone diisocyanate, polytetramethylene glycol, and dibutyltin dilaurate with propylene glycol butyl ether acetate, and stirring and reacting at a temperature of 90° C. to prepare a polyurethane solution;

[0056] Step 2: Dissolve the crushed bentonite together with the ultrafine calcium carbonate and the composite functional agent obtained in Example 2 with propylene glycol butyl ether acetate, and stir for 25 minutes at a speed of 900 r / min to obtain a composite slurry, wherein the ultrafine calcium carbonate used in this step has a particle size of 20-40 nm;

[0057] Step 3: Add dipropylene glycol butyl ether to the composite slurry obtained in the second step, stir and mix at a speed of 500 r / min for 30 minutes, then add the polyurethane solution obtained in the first step to the composite slurry, keep stirring at the same speed for 37 minutes to obtain an environmentally friendly waterproof coating.

[0058] Example 6

[0059] An environmentally friendly waterproof coating, characterized in that it comprises the following raw materials in parts by mass: 15 parts of isophorone diisocyanate, 40 parts of polyethylene glycol, 0.3 parts of dibutyltin dilaurate, 3.6 parts of ultrafine calcium carbonate, 2 parts of bentonite, 1 part of dipropylene glycol butyl ether, and 2.4 parts of the composite functional agent obtained in Example 3;

[0060] A method for preparing an environmentally friendly waterproof coating comprises the following steps:

[0061] The first step: weighing the raw materials by mass: 15 parts of isophorone diisocyanate, 40 parts of polyethylene glycol, 0.3 parts of dibutyltin dilaurate, 3.6 parts of ultrafine calcium carbonate, 2 parts of bentonite, 1 part of dipropylene glycol butyl ether, and 2.4 parts of the composite functional agent obtained in Example 3, dissolving isophorone diisocyanate, polyethylene glycol, and dibutyltin dilaurate with propylene glycol methyl ether acetate, and stirring the reaction at a temperature of 100° C. to prepare a polyurethane solution;

[0062] Step 2: Dissolve the crushed bentonite together with the ultrafine calcium carbonate and the composite functional agent obtained in Example 3 with propylene glycol methyl ether acetate, and stir for 20 minutes at a speed of 1000 r / min to obtain a composite slurry, wherein the ultrafine calcium carbonate used in this step has a particle size of 20-40 nm;

[0063] Step 3: Add dipropylene glycol butyl ether to the composite slurry obtained in the second step, stir and mix at a speed of 600 r / min for 30 minutes, then add the polyurethane solution obtained in the first step to the composite slurry, keep stirring at the same speed for 30 minutes to obtain an environmentally friendly waterproof coating.

[0064] Comparative Example 1

[0065] The "composite functional agent obtained in Example 3" used in Example 6 was removed, and the other conditions and preparation steps remained unchanged.

[0066] Comparative Example 2

[0067] This comparative example is a polyurethane waterproof coating sold by Shandong Meisente Waterproof Materials Co., Ltd.

[0068] The environmentally friendly waterproof coating obtained in Examples 4-6 and Comparative Example 1 and the polyurethane waterproof coating sold by Shandong Meisente Waterproof Materials Co., Ltd. in Comparative Example 2 were subjected to water contact angle test and abrasion resistance test. The test results are shown in Table 1.

[0069] Water contact angle test: Use the German Dataphysics water contact angle tester to test the water contact angle of the paint surface.

[0070] Wear resistance test: Wear resistance test is carried out in accordance with the national standard GB / T1768-2006.

[0071] Table 1

[0072] project Water contact angle (°) Wear times Example 4 113 50 Example 5 109 50 Example 6 114 50 Comparative Example 1 67 39 Comparative Example 2 65 42

[0073] It can be seen from Table 1 that the water contact angle of an environmentally friendly waterproof coating in Examples 4-6 is much larger than that of the commercially available polyurethane waterproof coating and is greater than 90°, showing hydrophobicity, while the water contact angle of an environmentally friendly waterproof coating in Comparative Example 1 to which the composite functional agent of the present invention is not added is similar to that of the commercially available polyurethane waterproof coating and is less than 90°, showing hydrophilicity, indicating that the composite functional agent of the present invention can effectively improve the waterproof performance of the prepared waterproof coating film; in addition, the wear resistance of the environmentally friendly waterproof coating of Examples 4-6 of the present invention is also stronger than that of the commercially available polyurethane waterproof coating, indicating that the environmentally friendly waterproof coating of the present invention has good wear resistance and can be widely used in the field of building decoration.

[0074] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. An environmentally friendly waterproof coating, characterized in that: The invention comprises the following raw materials in parts by weight: 10-15 parts of isophorone diisocyanate, 25-40 parts of polyether polyol, 0.1-0.3 parts of catalyst, 3.6-5 parts of ultrafine calcium carbonate, 2-3 parts of bentonite, 1-2.5 parts of film-forming aid, and 1.6-2.4 parts of composite functional agent; Wherein, the composite functional agent is prepared by the following steps: Step 1: Mix phloroglucinol, chloroform and potassium hydroxide solution in a container, stir evenly, and react at 65-70°C for 1 hour. After the reaction, remove the solvent by rotary evaporation, and adjust the pH of the remaining liquid to below 3 with hydrochloric acid to obtain intermediate 1; Step 2: Mix the intermediate 1, 2,2,2-trifluoroethanol, potassium carbonate solution and dimethyl sulfoxide in a container, stir evenly, and react at 60-80° C. for 3-4 hours to obtain the intermediate 2; Step 3: Mix the intermediate 2, diethyl phosphite, 3-aminopropyltriethoxysilane and citric acid in a container, stir evenly, and react at room temperature for 2-3 hours to obtain the composite functional agent.

2. The environmentally friendly waterproof coating according to claim 1, characterized in that: The potassium hydroxide solution used in step 1 is a 30% by mass potassium hydroxide aqueous solution, and the amount ratio of phloroglucinol, chloroform and potassium hydroxide solution used is 0.1 mol: 20-30 mL: 35-40 mL.

3. The environmentally friendly waterproof coating according to claim 1, characterized in that: The potassium carbonate solution used in step 2 is a 30% by mass potassium carbonate aqueous solution, and the amount ratio of the intermediate 1, 2,2,2-trifluoroethanol, potassium carbonate solution, and dimethyl sulfoxide used is 0.08 mol: 0.24-0.3 mol: 130 mL: 30-40 mL.

4. The environmentally friendly waterproof coating according to claim 1, characterized in that: The amount ratio of intermediate 2, diethyl phosphite, 3-aminopropyltriethoxysilane and citric acid used in step 3 is 0.06 mol: 0.06 mol: 0.06 mol: 0.006-0.01 mol.

5. A method for preparing an environmentally friendly waterproof coating, characterized in that: The following steps are involved: The first step: weighing the raw materials according to the mass proportions of isophorone diisocyanate 10-15 parts, polyether polyol 25-40 parts, catalyst 0.1-0.3 parts, ultrafine calcium carbonate 3.6-5 parts, bentonite 2-3 parts, film-forming aid 1-2.5 parts, composite functional agent 1.6-2.4 parts, dissolving isophorone diisocyanate, polyether polyol and catalyst with an environmentally friendly solvent and stirring to react to prepare a polyurethane solution; Step 2: Dissolve the bentonite together with ultrafine calcium carbonate and composite functional agent in an environmentally friendly solvent and stir at high speed for 20-30 minutes to obtain a composite slurry; Step 3: Add film-forming aid to the composite slurry obtained in the second step, stir and mix at high speed for 30 minutes, then add the polyurethane solution obtained in the first step to the composite slurry, keep stirring at the same speed for 30-45 minutes to obtain an environmentally friendly waterproof coating.

6. The method for preparing an environmentally friendly waterproof coating according to claim 5, characterized in that: The polyether polyol is one of polyethylene glycol and polytetrahydrofuran diol, the catalyst is dibutyltin dilaurate, the film-forming aid is dipropylene glycol butyl ether, and the environmentally friendly solvent is one of propylene glycol methyl ether acetate and propylene glycol butyl ether acetate.

7. The method for preparing an environmentally friendly waterproof coating according to claim 5, characterized in that: The particle size of the ultrafine calcium carbonate is less than 20-40 nm.

8. The method for preparing an environmentally friendly waterproof coating according to claim 5, characterized in that: The reaction temperature in the first step is 80-100°C.

9. The method for preparing an environmentally friendly waterproof coating according to claim 5, characterized in that: The speed condition of high-speed stirring in the second step is 800-100r / min.

10. The method for preparing an environmentally friendly waterproof coating according to claim 5, characterized in that: The speed condition of high-speed stirring in the third step is 400-600r / min.