Method for preparing anti-permeation anti-corrosion filler by using waste rubber and anti-corrosion coating

Abstract

The invention provides a method for preparing anti-permeation anti-corrosion filler by using waste rubber and anti-corrosion paint, and belongs to the technical field of paints.The method comprises the steps that the waste rubber is smashed and sieved to obtain rubber particles, then the rubber particles are sequentially subjected to acid pickling, alkali washing and water washing and dried, then the rubber particles are added into tetrachloroethylene to be chlorinated, flocculent products are removed through an air blowing rotary furnace, and the anti-permeation anti-corrosion filler is obtained; and adding the rubber particles into tetrachloroethylene again for chlorination, carrying out bubbling operation, and draining to obtain the anti-permeation and anti-corrosion filler. The chlorine content of the impermeable anticorrosive filler prepared by the method is increased, the corrosion resistance is enhanced, and an anticorrosive coating prepared from the filler can effectively solve the problem of diffusion of water molecules, also can effectively inhibit permeation and migration of corrosive medium chloride ions, and can greatly improve the impermeability.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a method for preparing anti-permeability and anti-corrosion fillers using waste rubber and an anti-corrosion coating. Background Technology

[0002] Currently, offshore wind power is rapidly expanding into deep-sea areas. However, the combined effects of complex marine environments, such as high salinity, high humidity, strong ultraviolet radiation, wave impact, marine organism attachment, and dissolved oxygen, pose a significant threat of corrosion to offshore wind turbine structures, severely restricting their economic viability and safety. To mitigate corrosion and extend the service life of offshore wind turbine structures, protective coatings are often applied. The anti-permeability and anti-corrosion fillers in these protective coatings are crucial for resisting corrosion.

[0003] However, protective coatings are prone to failure after prolonged use. Chloride ions are one of the most destructive environmental factors causing this failure. The failure mechanism involves chloride ions, with their small ionic radius (0.181 nm) and high mobility, diffusing through the gaps between the coating's molecular chains (especially in the water-swollen state). The permeation rate is influenced by the coating's cross-linking density (low-cross-linked resins penetrate more easily), the type of filler (sheet-like fillers such as glass flakes can extend the diffusion path), and the ambient temperature (the diffusion rate doubles for every 10°C increase). The permeation process involves water molecules first penetrating into the coating to form "water channels," followed by chloride ions migrating along the hydration path (significantly increasing ionic conductivity). Chloride ions have a permeability coefficient 1-2 orders of magnitude higher than oxygen, ultimately leading to corrosion pits within the coating. The chloride ions then diffuse outwards from these pits, causing the coating to fail and the entire coating to peel off. To overcome the problem of chloride ion diffusion in the swollen state, we propose a method for preparing anti-permeability and anti-corrosion fillers and coatings using waste rubber. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing anti-permeability and anti-corrosion fillers and anti-corrosion coatings using waste rubber, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a method for preparing anti-permeability and anti-corrosion fillers using waste rubber, comprising the following steps: S1: The waste rubber is crushed and sieved to obtain rubber particles. The rubber particles are then subjected to acid washing, alkali washing and water washing in sequence to remove residual moisture from the surface. S2: Add the rubber granules treated in step S1 to tetrachloroethylene, stir, then transfer to a sealed container and heat to 130°C and react at a constant temperature. After flocculent products appear on the surface of the rubber granules, transfer them to a filter screen. S3: Dry the flocculent product, and then use a rotary kiln to remove the flocculent product from the surface of the rubber particles; S4: Add the rubber granules treated in step S3 back into tetrachloroethylene, stir again, then heat to 130°C and stir continuously, and perform bubbling operation during the stirring process. S5: Drain the rubber particles treated in step S4 to obtain a rubber-based anti-permeability and anti-corrosion filler.

[0006] Preferably, in step S1, the particle size of the rubber particles is 30–220 μm.

[0007] Preferably, in step S1, the rubber particles are acid-washed using hydrochloric acid with a pH < 2.

[0008] Preferably, in step S1, the rubber particles are subjected to alkaline washing treatment using a sodium hydroxide solution with pH > 12.

[0009] Preferably, in step S2 or step S4, the mass concentration of tetrachloroethylene is not less than 90%.

[0010] Preferably, in step S2, the stirring time is 3 to 24 hours.

[0011] Preferably, in step S3, the drying method is blower drying, vacuum drying, or freeze drying.

[0012] Preferably, in step S4, the time for re-stirring is at least 1 hour.

[0013] Preferably, in step S4, chlorine gas is used for bubbling during the stirring process, and the bubbling rate is 1 to 3 bubbles per second, with continuous bubbling operation for 6 to 12 hours.

[0014] The present invention also provides an anti-corrosion coating, comprising an anti-permeability and anti-corrosion filler prepared by the above method and an epoxy-based coating, wherein the epoxy-based coating uses ethyl acetate as a diluent.

[0015] Compared with the prior art, the present invention has the following technical effects: This invention proposes a method for preparing anti-permeability and anti-corrosion fillers based on waste rubber. The waste rubber is treated and then added twice to tetrachloroethylene with a mass concentration of not less than 90%. In the first addition, tetrachloroethylene thoroughly wets and chlorinates the rubber particles. In the second addition, chlorine gas is added and bubbled. Hydrogen atoms in the rubber molecules undergo a substitution reaction with chlorine in the tetrachloroethylene solvent, with chlorine gradually replacing the hydrogen atoms in the rubber molecules. The anti-permeability and anti-corrosion filler prepared using this method has an increased chlorine content, enhancing its corrosion resistance. Anti-corrosion coatings made with this filler can effectively solve the problem of water molecule diffusion and effectively inhibit the penetration and migration of chloride ions in corrosive media, thus greatly improving anti-permeability performance. Attached Figure Description

[0016] Figure 1 This is a top view of the anti-permeability and anti-corrosion packing material of Embodiment 1 of the present invention; Figure 2 This is a diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:1 according to Example 1 of the present invention. Figure 3 This is a diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:3 according to Example 1 of the present invention. Figure 4 This is a top view of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:1 according to Example 1 of the present invention. Figure 5 The contact angle test diagram is shown for the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating in a mass ratio of 1:1 according to Example 1 of the present invention. Figure 6 The tensile strength diagram is shown for the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating in a mass ratio of 1:1 according to Example 1 of the present invention. Figure 7 This is a top view of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:3 according to Example 1 of the present invention. Figure 8 The contact angle test diagram is shown for the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating in a mass ratio of 1:3 according to Example 1 of the present invention. Figure 9 The tensile strength diagram is shown for the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:3 according to Example 1 of the present invention. Figure 10 This is a top view of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:1 according to Example 2 of the present invention. Figure 11The contact angle test diagram is shown for the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:1 according to Example 2 of the present invention. Figure 12 The tensile strength diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating in a mass ratio of 1:1 according to Example 2 of the present invention is shown. Figure 13 This is a top view of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating in a mass ratio of 1:3 according to Example 2 of the present invention. Figure 14 The contact angle test diagram is shown for the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:3 according to Example 2 of the present invention. Figure 15 The tensile strength diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating in a mass ratio of 1:3 according to Example 2 of the present invention is shown. Figure 16 This is a top view of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:1 according to Example 3 of the present invention. Figure 17 The contact angle test diagram is shown for the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating in a mass ratio of 1:1 according to Example 3 of the present invention. Figure 18 The tensile strength diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating in a mass ratio of 1:1 according to Example 3 of the present invention is shown. Figure 19 This is a top view of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:3 according to Example 3 of the present invention. Figure 20 The contact angle test diagram is shown for the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:3 according to Example 3 of the present invention. Figure 21 The tensile strength diagram is shown for the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:3 according to Example 3 of the present invention. Figure 22 This is a top view of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating in a mass ratio of 1:1 according to Example 4 of the present invention. Figure 23 The contact angle test diagram is shown for the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:1 according to Example 4 of the present invention. Figure 24 The tensile strength diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating in a mass ratio of 1:1 according to Example 4 of the present invention is shown. Figure 25 This is a top view of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating in a mass ratio of 1:3 according to Example 4 of the present invention. Figure 26 The contact angle test diagram is shown for the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:3 according to Example 4 of the present invention. Figure 27 This is a tensile strength diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and the epoxy coating in a mass ratio of 1:3 according to Example 4 of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0018] In this article, terms such as "left," "right," "up," "down," "front," and "back" are established based on the positional relationships shown in the attached drawings. Depending on the attached drawings, the corresponding positional relationships may also change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection.

[0019] A method for preparing anti-permeability and anti-corrosion fillers using waste rubber includes the following steps: S1: The waste rubber is crushed and sieved to obtain rubber particles with a particle size of 30-220μm. The thickness of the rubber film should be appropriate. If the particle size is too large, it will affect the hydrophobicity of the rubber film, and if the particle size is too small, it will cause cracks in the coating. Then, the rubber particles are subjected to acid washing, alkali washing and water washing in sequence to remove residual oil, dust and other impurities on the surface, and then remove residual moisture on the surface.

[0020] In step S1, acid washing uses hydrochloric acid with a pH < 2 to remove alkaline substances from the surface of the rubber granules. Alkaline washing uses sodium hydroxide solution with a pH > 12 to remove oil and acidic impurities from the surface of the rubber granules. Water washing uses distilled water to wash away residual acids and alkalis from the surface of the granules until the pH is in the range of 6.5 to 7.5.

[0021] S2: Add the rubber granules treated in step S1 to tetrachloroethylene with a mass concentration of not less than 90%, and stir for 3 to 24 hours. The larger the particle size of the rubber granules, the longer the stirring time, which is beneficial for the tetrachloroethylene to fully wet the surface of the rubber granules. Then transfer it to a sealed container and heat it to 130°C and react at a constant temperature. After flocculent products appear on the surface of the rubber granules, transfer it to a filter screen.

[0022] In step S2, the flocculent product is filamentous rubber chlorinated with tetrachloroethylene. During the crushing process of waste rubber, the rubber surface is stretched to form filamentous rubber. After being chlorinated with tetrachloroethylene, the filamentous rubber becomes a flocculent product. This flocculent product has too weak tensile strength, so it needs to be cleaned up.

[0023] S3: Dry the flocculent product, and then use a rotary kiln to remove the flocculent product from the surface of the rubber particles. Adjust the speed to make the particles roll evenly in the rotary kiln until no obvious flocculent product is blown out of the rotary kiln within 10 minutes and the quality of the rubber particles no longer changes. The chlorinated products (i.e. flocculent products) that are easily detached from the surface of the rubber particles have been completely removed.

[0024] In step S3, the flocculent product can be dried using drying methods such as forced air drying, vacuum drying, and freeze drying.

[0025] S4: The rubber granules treated in step S3 are added again to tetrachloroethylene with a mass concentration of not less than 90%, and stirred again for at least 1 hour. The larger the particle size of the rubber granules, the longer the stirring time, which is beneficial for the tetrachloroethylene to fully wet the surface of the rubber granules. Then, the mixture is heated to 130°C and stirred continuously. During the stirring process, chlorine gas is used for bubbling, with a bubbling rate of 1 to 3 bubbles per second. Bubbling is carried out continuously for 6 to 12 hours. The larger the rubber granules, the faster the bubbling rate and the longer the bubbling time.

[0026] In step S4, tetrachloroethylene, acting as a solvent, promotes the contact between chlorine gas and rubber molecules, thereby improving reaction efficiency. The high temperature of 130°C and the bubbling environment of chlorine gas ensure that the reaction proceeds fully.

[0027] S5: Drain the rubber granules treated in step S4 until no tetrachloroethylene drips within 3 minutes to obtain a rubber-based anti-permeability and anti-corrosion filler.

[0028] The rubber-based anti-permeability and anti-corrosion filler obtained in step S5 must be stored in a sealed container. During storage, a certain amount of solvent identical to that used in the coating must be added for moisture retention. When using, it can be directly added to the substrate coating in proportion and stirred evenly.

[0029] The rubber-based anti-permeability and anti-corrosion filler prepared by this invention is used in combination with a substrate coating. This embodiment provides an anti-corrosion coating, which includes an anti-permeability and anti-corrosion filler prepared by the method provided by this invention and an epoxy-based coating. The diluent used for the epoxy-based coating is ethyl acetate diluent. Therefore, this filler has been pre-soaked in ethyl acetate diluent before use.

[0030] This invention proposes a method for preparing anti-permeability and anti-corrosion fillers based on waste rubber. The waste rubber is treated and then added twice to tetrachloroethylene with a mass concentration of not less than 90%. In the first addition, tetrachloroethylene thoroughly wets and chlorinates the rubber particles. In the second addition, chlorine gas is added and bubbled. Hydrogen atoms in the rubber molecules undergo a substitution reaction with chlorine in the tetrachloroethylene solvent, with chlorine gradually replacing the hydrogen atoms in the rubber molecules. The anti-permeability and anti-corrosion filler prepared using this method has an increased chlorine content, enhancing its corrosion resistance. Anti-corrosion coatings made with this filler can effectively solve the problem of water molecule diffusion and effectively inhibit the penetration and migration of chloride ions in corrosive media, thus greatly improving anti-permeability performance.

[0031] Example 1 A method for preparing anti-permeability and anti-corrosion fillers using waste rubber includes the following steps: S1: The waste rubber is crushed using a shredder, and then the crushed rubber particles are sieved through a screen. First, rubber particles larger than 50μm are sieved out. Then, rubber particles with a diameter of 50μm or less are sieved again to remove particles smaller than 30μm, resulting in rubber particles with a diameter of 30-50μm. The obtained rubber particles are then subjected to acid washing, alkali washing, and water washing in sequence to remove residual moisture from the surface of the rubber particles.

[0032] S2: Add the rubber particles treated in step S1 to tetrachloroethylene with a mass concentration of not less than 90% and stir for 3 hours. Then transfer it to a sealed container, heat it to 130°C and keep it at a constant temperature for 12 hours. Flocculent products appear on the surface of the rubber particles. Then transfer the rubber particles to a filter screen.

[0033] S3: Dry the flocculent product by blowing air, and then place the rubber particles in a rotary kiln and rotate for 2 hours to remove the flocculent product from the surface of the rubber particles.

[0034] S4: Add the rubber granules treated in step S3 to tetrachloroethylene with a mass concentration of not less than 90%, stir again for 1 hour, then heat to 130°C and stir continuously. During the stirring process, chlorine gas is used for bubbling, with a bubbling rate of 1 bubble per second, and the bubbling operation is continued for 6 hours.

[0035] S5: Drain the rubber granules treated in step S4 until no tetrachloroethylene drips within 3 minutes to obtain a rubber-based anti-permeability and anti-corrosion filler.

[0036] The impermeable and corrosion-resistant filler prepared in Example 1 is as follows: Figure 1 As shown.

[0037] refer to Figure 2 and Figure 4In Example 1, the anti-permeability and anti-corrosion filler prepared was soaked in ethyl acetate diluent for 12 hours and the solvent was drained. The anti-permeability and anti-corrosion filler was then mixed with an epoxy-based coating at a mass ratio (excluding volatile solvents) of 1:1 to prepare an anti-corrosion coating. (Reference) Figure 3 and Figure 7 In Example 1, the anti-permeability and anti-corrosion filler prepared was soaked in ethyl acetate diluent for 12 hours and the solvent was drained. The anti-permeability and anti-corrosion filler was then mixed with epoxy coating at a mass ratio (excluding volatile solvents) of 1:3 to prepare an anti-corrosion coating.

[0038] Example 2 A method for preparing anti-permeability and anti-corrosion fillers using waste rubber includes the following steps: S1: The waste rubber is crushed using a shredder, and then the crushed rubber particles are sieved through a screen. First, rubber particles larger than 120μm are sieved out. Then, rubber particles with a diameter of 120μm or less are sieved again to remove particles smaller than 100μm, resulting in rubber particles with a diameter of 100-120μm. The obtained rubber particles are then subjected to acid washing, alkali washing, and water washing in sequence to remove residual moisture from the surface of the rubber particles.

[0039] S2: Add the rubber particles treated in step S1 to tetrachloroethylene with a mass concentration of not less than 90% and stir for 12 hours. Then transfer it to a sealed container and heat it to 130°C and keep it at a constant temperature for 18 hours. Flocculent products appear on the surface of the rubber particles. Then transfer the rubber particles to a filter screen.

[0040] S3: Dry the flocculent product by blowing air, and then place the rubber particles in a rotary kiln and rotate for 2 hours to remove the flocculent product from the surface of the rubber particles.

[0041] S4: Add the rubber granules treated in step S3 to tetrachloroethylene with a mass concentration of not less than 90%, stir again for 2 hours, then heat to 130°C and stir continuously. During the stirring process, chlorine gas is used for bubbling, with a bubbling rate of 2 bubbles per second, and the bubbling operation is continued for 9 hours.

[0042] S5: Drain the rubber granules treated in step S4 until no tetrachloroethylene drips within 3 minutes to obtain a rubber-based anti-permeability and anti-corrosion filler.

[0043] refer to Figure 10 In Example 2, the anti-permeability and anti-corrosion filler prepared was soaked in ethyl acetate diluent for 12 hours and the solvent was drained. The anti-permeability and anti-corrosion filler was then mixed with an epoxy-based coating at a mass ratio (excluding volatile solvents) of 1:1 to prepare an anti-corrosion coating. (Reference) Figure 13In Example 2, the anti-permeability and anti-corrosion filler prepared was soaked in ethyl acetate diluent for 12 hours and the solvent was drained. The anti-permeability and anti-corrosion filler was then mixed with epoxy coating at a mass ratio (excluding volatile solvents) of 1:3 to prepare an anti-corrosion coating.

[0044] Example 3 A method for preparing anti-permeability and anti-corrosion fillers using waste rubber includes the following steps: S1: The waste rubber is crushed using a shredder, and then the crushed rubber particles are sieved through a screen. First, rubber particles larger than 220μm are sieved out. Then, rubber particles with a diameter of 220μm or less are sieved again to remove particles smaller than 200μm, resulting in rubber particles with a diameter of 200-220μm. The obtained rubber particles are then subjected to acid washing, alkali washing, and water washing in sequence to remove residual moisture from the surface of the rubber particles.

[0045] S2: Add the rubber particles treated in step S1 to tetrachloroethylene with a mass concentration of not less than 90% and stir for 20 hours. Then transfer it to a sealed container and heat it to 130°C and react at a constant temperature for 22 hours. Flocculent products appear on the surface of the rubber particles. Then transfer the rubber particles to a filter screen.

[0046] S3: Dry the flocculent product by blowing air, and then place the rubber particles in a rotary kiln and rotate for 2 hours to remove the flocculent product from the surface of the rubber particles.

[0047] S4: Add the rubber granules treated in step S3 to tetrachloroethylene with a mass concentration of not less than 90%, stir again for 3 hours, then heat to 130°C and stir continuously. During the stirring process, chlorine gas is used for bubbling, with a bubbling rate of 3 bubbles per second, and the bubbling operation is continued for 10 hours.

[0048] S5: Drain the rubber granules treated in step S4 until no tetrachloroethylene drips within 3 minutes to obtain a rubber-based anti-permeability and anti-corrosion filler.

[0049] refer to Figure 16 In Example 3, the anti-permeability and anti-corrosion filler prepared was soaked in ethyl acetate diluent for 12 hours and the solvent was drained. The anti-permeability and anti-corrosion filler was then mixed with an epoxy-based coating at a mass ratio (excluding volatile solvents) of 1:1 to prepare an anti-corrosion coating. (Reference) Figure 19 In Example 3, the anti-permeability and anti-corrosion filler prepared was soaked in ethyl acetate diluent for 12 hours and the solvent was drained. The anti-permeability and anti-corrosion filler was then mixed with epoxy-based coating at a mass ratio (excluding volatile solvents) of 1:3 to prepare an anti-corrosion coating.

[0050] Example 4 A method for preparing anti-permeability and anti-corrosion fillers using waste rubber includes the following steps: S1: Use a shredder to crush the waste rubber, then use a sieve to sieve the crushed rubber particles. First, sieve out rubber particles with a diameter greater than 220μm. Then, sieve again for rubber particles with a diameter less than or equal to 220μm to remove rubber particles with a diameter less than 200μm and rubber particles between 200-220μm. Subsequently, the obtained rubber particles are subjected to acid washing, alkali washing, and water washing in sequence to remove residual moisture from the surface of the rubber particles.

[0051] S2: Add the rubber particles treated in step S1 to tetrachloroethylene with a mass concentration of not less than 90% and stir for 24 hours. Then transfer it to a sealed container and heat it to 130°C and react at a constant temperature for 24 hours. Flocculent products appear on the surface of the rubber particles. Then transfer the rubber particles to a filter screen.

[0052] S3: Dry the flocculent product by blowing air, and then place the rubber particles in a rotary kiln and rotate for 2 hours to remove the flocculent product from the surface of the rubber particles.

[0053] S4: Add the rubber granules treated in step S3 to tetrachloroethylene with a mass concentration of not less than 90%, stir again for 3 hours, then heat to 130°C and stir continuously. During the stirring process, chlorine gas is used for bubbling, with a bubbling rate of 3 bubbles per second, and the bubbling operation is carried out continuously for 12 hours.

[0054] S5: Drain the rubber granules treated in step S4 until no tetrachloroethylene drips within 3 minutes to obtain a rubber-based anti-permeability and anti-corrosion filler.

[0055] refer to Figure 22 In Example 4, the anti-permeability and anti-corrosion filler prepared was soaked in ethyl acetate diluent for 12 hours and the solvent was drained. The anti-permeability and anti-corrosion filler was then mixed with an epoxy-based coating at a mass ratio (excluding volatile solvents) of 1:1 to prepare an anti-corrosion coating. (Reference) Figure 25 In Example 4, the anti-permeability and anti-corrosion filler prepared was soaked in ethyl acetate diluent for 12 hours and the solvent was drained. The anti-permeability and anti-corrosion filler was then mixed with epoxy coating at a mass ratio (excluding volatile solvents) of 1:3 to prepare an anti-corrosion coating.

[0056] To test the effectiveness of the anti-permeability and anti-corrosion fillers prepared in Examples 1-4, this invention mixed the anti-permeability and anti-corrosion fillers prepared in Examples 1-4 with epoxy-based coatings to prepare anti-corrosion coatings. The mass ratio of filler to epoxy-based coating (excluding volatile solvents) was 1:1 and 1:3. The prepared anti-corrosion coatings were then subjected to contact angle and tensile strength tests. The test results are shown in Table 1. The contact angle test was conducted using a contact angle measuring instrument, and the tensile strength test was conducted using a universal testing machine.

[0057] The contact angle test procedure is as follows: First, the testing instrument is calibrated using a ceramic calibration rod. Then, the surface tension value of the distilled water sample is tested at a temperature of 25℃. The standard value is 71.97 mN / m. The test result shows that the average surface tension value of the left and right sides of the distilled water sample is 71.69 mN / m, which meets the requirements. The test sample is cut into 1×3 cm pieces and fixed with a clamp. The test sample is placed on the sample stage. The sample stage is moved to a suitable height so that the surface of the test sample is close to the tip of the needle. A droplet forms on the needle tip. With the needle tip stably suspended, the sample stage is slowly moved upward until the surface of the test sample just touches the bottom of the droplet, at which point the droplet detaches from the needle tip. After the droplet detaches from the needle tip, an image is quickly captured, saved, and the test data is exported.

[0058] The contact angle test diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating at a mass ratio of 1:1 in Example 1 is shown in the figure. Figure 5 The contact angle test diagram of the anti-corrosion coating formed by mixing anti-permeability and anti-corrosion filler with epoxy coating at a mass ratio of 1:3 is shown in the reference figure. Figure 8 The contact angle test diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating at a mass ratio of 1:1 in Example 2 is shown in the figure. Figure 11 The contact angle test diagram of the anti-corrosion coating formed by mixing anti-permeability and anti-corrosion filler with epoxy coating at a mass ratio of 1:3 is shown in the reference figure. Figure 14 The contact angle test diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating at a mass ratio of 1:1 in Example 3 is shown in the figure. Figure 17 The contact angle test diagram of the anti-corrosion coating formed by mixing anti-permeability and anti-corrosion filler with epoxy coating at a mass ratio of 1:3 is shown in the reference figure. Figure 20 The contact angle test diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating at a mass ratio of 1:1 in Example 4 is shown in the figure. Figure 23 The contact angle test diagram of the anti-corrosion coating formed by mixing anti-permeability and anti-corrosion filler with epoxy coating at a mass ratio of 1:3 is shown in the reference figure. Figure 26 .

[0059] The anti-permeability of anti-corrosion coatings is closely related to the contact angle. Generally, the larger the contact angle, the worse the wetting performance of the coating, and the less likely water is to penetrate through the microcracks in the coating, resulting in better anti-permeability. Especially in high-salt and high-humidity marine environments, coatings must possess strong anti-permeability properties. As shown in the contact angle data in Table 1, the anti-corrosion coating prepared using the anti-permeability filler of this invention exhibits excellent anti-permeability properties.

[0060] The tensile strength test procedure is as follows: First, ensure the surface of the test sample is flat and free of defects such as bubbles, cracks, and delamination. Cut the test sample into 2×5 cm dimensions. Refer to GB / T 528-2009 (dumbbell-shaped specimen) for testing the sample. The film thickness is 1.7 mm, the width of the narrow parallel section is 10 mm, and the initial gauge length is 27 mm. Clamp the test sample in the upper clamp, then move the lower clamp to the appropriate clamping position and tighten the lower end of the test sample. Start the universal testing machine, apply a slow and uniform load, observe the force pointer and plot the curve, record the data, and export the test data.

[0061] The tensile strength diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy-based coating in a mass ratio of 1:1 in Example 1 is shown in the figure. Figure 6 The tensile strength diagram of the anti-corrosion coating formed by mixing anti-permeability and anti-corrosion filler with epoxy-based coating at a mass ratio of 1:3 is provided for reference. Figure 9 The tensile strength diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating at a mass ratio of 1:1 in Example 2 is shown in the figure. Figure 12 The tensile strength diagram of the anti-corrosion coating formed by mixing anti-permeability and anti-corrosion filler with epoxy-based coating at a mass ratio of 1:3 is provided for reference. Figure 15 The tensile strength diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy-based coating at a mass ratio of 1:1 in Example 3 is shown in the figure. Figure 18 The tensile strength diagram of the anti-corrosion coating formed by mixing anti-permeability and anti-corrosion filler with epoxy-based coating at a mass ratio of 1:3 is provided for reference. Figure 21 The tensile strength diagram of the anti-corrosion coating formed by mixing the anti-permeability and anti-corrosion filler and epoxy coating at a mass ratio of 1:1 in Example 4 is shown in the figure. Figure 24 The tensile strength diagram of the anti-corrosion coating formed by mixing anti-permeability and anti-corrosion filler with epoxy-based coating at a mass ratio of 1:3 is provided for reference. Figure 27 .

[0062] In high-salt and high-humidity environments, the coefficients of thermal expansion of the substrate and coating differ when the temperature changes. Tensile strength testing primarily assesses two aspects of the coating's performance: firstly, good tensile strength and elongation at break help suppress the formation of microcracks on the coating surface; secondly, coatings with high tensile strength are less prone to large-scale peeling. As shown in Table 1, the anti-corrosion coating prepared using the anti-permeability and anti-corrosion filler of this invention is less prone to microcrack formation and large-scale peeling.

[0063]

[0064] The above embodiments merely illustrate the basic principles and characteristics of the present invention, but are not limited to the above implementation schemes. It should be understood that those skilled in the art can make various changes and modifications to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined freely by the appended claims and their equivalents.

Claims

1. A method for preparing anti-permeability and anti-corrosion fillers using waste rubber, characterized in that, Includes the following steps: S1: The waste rubber is crushed and sieved to obtain rubber particles. The rubber particles are then subjected to acid washing, alkali washing and water washing in sequence to remove residual moisture from the surface. S2: Add the rubber granules treated in step S1 to tetrachloroethylene, stir, then transfer to a sealed container and heat to 130°C and react at a constant temperature. After flocculent products appear on the surface of the rubber granules, transfer them to a filter screen. S3: Dry the flocculent product, and then use a rotary kiln to remove the flocculent product from the surface of the rubber particles; S4: Add the rubber granules treated in step S3 back into tetrachloroethylene, stir again, then heat to 130°C and stir continuously, and perform bubbling operation during the stirring process. S5: Drain the rubber particles treated in step S4 to obtain a rubber-based anti-permeability and anti-corrosion filler.

2. The method for preparing anti-permeability and anti-corrosion filler using waste rubber according to claim 1, characterized in that, In step S1, the particle size of the rubber particles is 30 to 220 μm.

3. The method for preparing anti-permeability and anti-corrosion fillers using waste rubber according to claim 1, characterized in that, In step S1, the rubber particles are pickled using hydrochloric acid with a pH < 2.

4. The method for preparing anti-permeability and anti-corrosion filler using waste rubber according to claim 1, characterized in that, In step S1, the rubber particles are subjected to alkaline washing treatment using a sodium hydroxide solution with pH > 12.

5. The method for preparing anti-permeability and anti-corrosion filler using waste rubber according to claim 1, characterized in that, In step S2 or step S4, the mass concentration of the tetrachloroethylene is not less than 90%.

6. The method for preparing anti-permeability and anti-corrosion filler using waste rubber according to claim 1, characterized in that, In step S2, the stirring time is 3 to 24 hours.

7. The method for preparing anti-permeability and anti-corrosion filler using waste rubber according to claim 1, characterized in that, In step S3, the drying method is blower drying, vacuum drying, or freeze drying.

8. The method for preparing anti-permeability and anti-corrosion filler using waste rubber according to claim 1, characterized in that, In step S4, the time for re-stirring is at least 1 hour.

9. The method for preparing anti-permeability and anti-corrosion filler using waste rubber according to claim 1, characterized in that, In step S4, chlorine gas is used for bubbling during the stirring process. The bubbling rate is 1 to 3 bubbles per second, and the bubbling operation is continuous for 6 to 12 hours.

10. An anti-corrosion coating, characterized in that, The invention includes an anti-permeability and anti-corrosion filler and an epoxy-based coating prepared by the method described in any one of claims 1-9, wherein the epoxy-based coating uses ethyl acetate as a diluent.

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