Anticorrosive coating and method for producing the same

Abstract

This invention relates to the field of coating technology and discloses an anti-corrosion coating and its preparation method. The method includes the following steps: (1) modifying wind turbine blade powder with an organic solvent to separate a solid phase component, and drying and photodegrading the solid phase component sequentially to obtain component A; (2) mixing a base resin, conductive filler, inorganic filler, and hydrochloric acid corrosion inhibitor in a first mixing and filtering to obtain component B; (3) mixing a base resin, polyamide curing agent, titanate coupling agent, and silicone resin binder in a second mixing and filtering to obtain component C; (4) mixing component A, component B, and component C in a third mixing; wherein the base resin contains coal-based resin, epoxy resin, and petroleum resin. The anti-corrosion coating of this invention has excellent anti-abrasion performance in low-temperature environments.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to an anti-corrosion coating and its preparation method. Background Technology

[0002] my country's wind power industry has entered a phase of rapid growth. With the increasing application and demand for wind turbine blades, the environmental pollution caused by these blades after retirement cannot be ignored, and these materials face a serious disposal problem. The composite material system used in wind turbine blades mainly includes: matrix materials, reinforcing materials, core materials, adhesives, and auxiliary materials. Matrix materials are mainly thermosetting resins such as unsaturated polyester resin, epoxy resin, and vinyl ester resin; reinforcing materials mainly include glass fiber reinforced materials and carbon fiber reinforced materials; core materials mainly include rigid foam and balsa wood; adhesives mainly include three categories: epoxy (EP), polyurethane (PU), and acrylate (AC), with epoxy adhesives being the most widely used and consumed. Auxiliary materials include release agents, curing agents, toughening agents, accelerators, and coatings, with coatings being the most important. The core material is usually composed of PVC foam and balsa wood, accounting for about 4.5% of its weight. Due to its light weight and high volatility, it has a significant impact on the reuse of waste wind turbine blades.

[0003] Currently, patent application CN115286972A discloses a method for preparing an anti-corrosion coating. This coating first achieves excellent anti-corrosion performance and environmental resistance through high cross-linking between epoxy resin and modified aniline curing agent. Secondly, the addition of toughening epoxy resin further enhances the coating's high-temperature adhesion and anti-corrosion properties. Furthermore, the addition of polyphenylene sulfide resin powder and inorganic fillers further improves the coating's shielding performance. Although the disclosed coating possesses excellent properties and can withstand long-term corrosion from high humidity, high salt, and high acid media, it exhibits certain limitations under specific working environments. For example, its surface abrasion resistance decreases at low temperatures, and the paint film cracks, affecting its functionality.

[0004] Therefore, there is an urgent need to develop a coating that can exhibit excellent anti-abrasion properties in low-temperature environments. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of reduced surface abrasion resistance and surface cracking of existing coatings in low-temperature environments, which affect their function. This invention provides an anti-corrosion coating and its preparation method, which can exhibit excellent abrasion resistance in low-temperature environments.

[0006] To achieve the above objectives, the first aspect of the present invention provides a method for preparing an anti-corrosion coating, the method comprising the following steps:

[0007] (1) The wind turbine blade powder and organic solvent are modified by reaction, and the solid phase component is separated. The solid phase component is dried and photodegraded in sequence to obtain component A.

[0008] (2) The base resin, conductive filler, inorganic filler and hydrochloric acid corrosion inhibitor are first mixed and filtered, and the filtrate obtained is component B;

[0009] (3) The base resin, polyamide curing agent, titanate coupling agent and silicone resin adhesive are mixed for the second time, and the resulting mixture is filtered. The filtrate is component C.

[0010] (4) Mix the components A, B and C in a third mixture;

[0011] The base resin contains coal-based resin, epoxy resin, and petroleum resin.

[0012] Preferably, in step (1), the preparation process of the wind turbine blade powder includes ball milling the wind turbine blade to a mesh size of less than 200 mesh.

[0013] Preferably, in step (1), the organic solvent is at least one of cyclohexanone, dichloroethane, and tetrahydrofuran.

[0014] Preferably, in step (1), the solid-liquid mass ratio of the wind turbine blade powder and the organic solvent is (2-5):1.

[0015] Preferably, in step (1), the conditions for the modification reaction include: a temperature of 100-180°C and a time of 80-120 min.

[0016] Preferably, in step (1), the conditions for photodegradation include: the light source is ultraviolet light, and the time is 60-150 min.

[0017] Preferably, the preparation process of the base resin includes: mixing the coal-based resin, the epoxy resin and the petroleum resin.

[0018] Preferably, the mass ratio of the coal-based resin, the epoxy resin, and the petroleum resin is 1:(1-2):(1-2).

[0019] Preferably, the preparation process of the base resin is carried out under stirring conditions, which include: a temperature of 80-100℃, a stirring speed of 40-100rpm, and a time of 35-60min.

[0020] Preferably, in step (2), the conductive filler is graphite powder and / or carbon black powder.

[0021] Preferably, the inorganic filler is at least one of mica powder, diatomaceous earth, and titanium dioxide.

[0022] Preferably, the mass ratio of the base resin, the conductive filler, the inorganic filler and the hydrochloric acid corrosion inhibitor is (60-100):(1-3):1:(0.1-0.5).

[0023] Preferably, in step (2), the conditions for the first mixing include: a temperature of 80-100°C, a vacuum of -0.1 to -0.05 MPa, and a time of 20-50 min.

[0024] Preferably, in step (3), the mass ratio of the base resin, the polyamide curing agent, the titanate coupling agent and the silicone resin adhesive is (60-100):(1-3):1:(1-3).

[0025] Preferably, in step (3), the mixture further contains a diphenylamine antioxidant.

[0026] Preferably, the mass ratio of the base resin, the polyamide curing agent, the titanate coupling agent, the silicone resin adhesive, and the diphenylamine antioxidant is (80-100):(2-5):(1-2):(1-3):1.

[0027] Preferably, in step (3), the conditions for the second mixing include: a temperature of 30-60°C, a vacuum of -0.1 to -0.05 MPa, and a time of 20-50 min.

[0028] Preferably, in step (4), the mass ratio of the amounts of component A, component B and component C is 1:(15-20):(4-7).

[0029] A second aspect of the present invention provides an anti-corrosion coating prepared by the method described above.

[0030] The above technical solution uses modified wind turbine blade powder to prepare coatings, removes polyvinyl chloride (PVC) and other materials from waste wind turbine blades, and makes full use of the matrix and reinforcing materials in waste wind turbine blades to enhance the coating's anti-abrasion performance in low-temperature environments. At the same time, it provides a feasible method for the resource utilization of waste wind turbine blades. Detailed Implementation

[0031] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0032] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0033] The method for preparing the anti-corrosion coating of the present invention includes the following steps:

[0034] (1) The wind turbine blade powder and organic solvent are modified by reaction, and the solid phase component is separated. The solid phase component is dried and photodegraded in sequence to obtain component A.

[0035] (2) The base resin, conductive filler, inorganic filler and hydrochloric acid corrosion inhibitor are first mixed and filtered, and the filtrate obtained is component B;

[0036] (3) The base resin, polyamide curing agent, titanate coupling agent and silicone resin adhesive are mixed for the second time, and the resulting mixture is filtered. The filtrate is component C.

[0037] (4) Mix the components A, B and C in a third mixture;

[0038] The base resin contains coal-based resin, epoxy resin, and petroleum resin.

[0039] According to the method described in this invention, by using waste wind turbine blades as raw materials for coating production, the effective components (matrix material and reinforcing material) of waste wind turbine blades are utilized to improve the anti-abrasion performance of the coating in low-temperature environments, and at the same time, a feasible method for the resource utilization of waste wind turbine blades is provided.

[0040] In the method described in this invention, step (1) involves ball milling the wind turbine blade powder to a mesh size of 200 mesh or less. To improve the abrasion resistance of the coating, the mesh size of the wind turbine blade powder is preferably 150 mesh or less, more preferably 50-120 mesh. In some specific embodiments, the wind turbine blade is wet-ball-milled to a mesh size of 200 mesh or less.

[0041] In the method described in this invention, in step (1), the organic solvent can be an organic solvent capable of dissolving polyvinyl chloride (PVC), preferably at least one of cyclohexanone, dichloroethane and tetrahydrofuran, more preferably cyclohexanone and / or dichloroethane.

[0042] In the method described in this invention, in step (1), the solid-liquid mass ratio of the wind turbine blade powder and the organic solvent can be (2-5):1, preferably (3-4):1, and specifically, it can be 3:1, 3.1:1, 3.2:1, 3.3:1, 3.4:1, 3.5:1, 3.6:1, 3.7:1, 3.8:1, 3.9:1 or 4:1.

[0043] In the method described in this invention, in step (1), the conditions of the modification reaction include: the temperature can be 100-180℃, preferably 120-150℃; the time can be 80-120min, preferably 80-100min.

[0044] In the method described in this invention, in step (1), the process of separating the solid phase components is carried out by filtration. The filtration is performed through a 50-80 mesh steel filter.

[0045] In the method described in this invention, in step (1), the drying conditions include: the temperature can be 60-100℃, preferably 80-100℃; the time can be 1-3h, preferably 2-3h.

[0046] In the method described in this invention, in step (1), the conditions for photodegradation include: the light source can be ultraviolet light, and the time can be 60-150 min, preferably 80-120 min. The ultraviolet light can be provided by an ultraviolet lamp. The irradiance of the ultraviolet light can be 150-300 μW / cm². 2 .

[0047] In the method described in this invention, the preparation process of the base resin may include: mixing the coal-based resin, the epoxy resin and the petroleum resin until the resulting mixed resin is transparent.

[0048] In the method described in this invention, the mass ratio of the coal-based resin, the epoxy resin and the petroleum resin can be 1:(1-2):(1-2), preferably 1:(1-1.5):(1-1.5), and specifically, for example, 1:1:1, 3:3:4, 1:1:1.5, 3:4:4 or 1:1.5:1.5.

[0049] In the method described in this invention, the preparation process of the base resin is carried out under stirring conditions, and the conditions of the preparation process of the base resin include: the temperature can be 80-100℃, preferably 90-100℃; the stirring speed can be 40-100rpm, preferably 50-60rpm; and the time can be 35-60min, preferably 45-55min.

[0050] In the method described in this invention, in step (2), the conductive filler can be graphite powder and / or carbon black powder. The graphite powder can not only improve the conductivity of the coating but also enhance its wear resistance. The carbon black powder can improve the coating performance, enhance weather resistance, improve the coating appearance, and increase conductivity.

[0051] In the method described in this invention, the inorganic filler can be at least one selected from mica powder, diatomaceous earth, and titanium dioxide. To improve the stability of the material, increase tensile strength, and enhance impact resistance and deformation resistance, the inorganic filler is preferably mica powder and titanium dioxide. The ratio of mica powder to titanium dioxide can be (1-3):1. To increase the wear resistance and scratch resistance of the coating film, the inorganic filler is preferably diatomaceous earth and titanium dioxide. The ratio of diatomaceous earth to titanium dioxide can be (1-3):1.

[0052] In the method described in this invention, the mass ratio of the base resin, the conductive filler, the inorganic filler, and the hydrochloric acid corrosion inhibitor can be (60-100):(1-3):1:(0.1-0.5), preferably (60-80):(2-3):1:(0.2-0.4), specifically for example, 60:2:1:0.2, 60:3:1:0.4, 80:3:1:0.2, 95:3:1.5:0.5, 80:2:1:0.2, or 80:2:1:0.4.

[0053] In some embodiments, in step (2), the base resin, the conductive filler, the inorganic filler, and the hydrochloric acid corrosion inhibitor are first mixed and filtered. The conductive filler is graphite powder, and the inorganic filler is mica powder and titanium dioxide. The mass ratio of the base resin, the conductive filler, the inorganic filler, and the hydrochloric acid corrosion inhibitor is (60-100):(1-3):1:(0.1-0.5), and the mass ratio of the mica powder and the titanium dioxide is (1-3):1. In a specific embodiment, the mass ratio of the base resin, the graphite powder, the mica powder, the titanium dioxide, and the hydrochloric acid corrosion inhibitor is 95:3:1:0.5:0.5.

[0054] In some embodiments, in step (2), the base resin, the conductive filler, the inorganic filler, and the hydrochloric acid corrosion inhibitor are first mixed and filtered. The conductive filler is carbon black powder, and the inorganic filler is diatomaceous earth and titanium dioxide. The mass ratio of the base resin, the conductive filler, the inorganic filler, and the hydrochloric acid corrosion inhibitor is (60-100):(1-3):1:(0.1-0.5), and the mass ratio of the diatomaceous earth to the titanium dioxide is (1-3):1. In a specific embodiment, the mass ratio of the base resin, the carbon black powder, the diatomaceous earth, the titanium dioxide, and the hydrochloric acid corrosion inhibitor is 95:3:1:0.5:0.5.

[0055] In the method described in this invention, in step (2), the conditions for the first mixing include: a temperature of 80-100°C, preferably 85-95°C; a vacuum of -0.1 to -0.05 MPa, preferably -0.09 to -0.07 MPa; and a time of 20-50 min, preferably 30-50 min. The first mixing is carried out under stirring conditions, with a stirring speed of 100-150 rpm. The filtration is performed through a 50-80 mesh steel filter. In this document, the vacuum degree is the absolute pressure minus the atmospheric pressure.

[0056] In the method described in this invention, in step (3), the mass ratio of the base resin, the polyamide curing agent, the titanate coupling agent and the silicone resin adhesive can be (60-100):(1-3):1:(1-3), preferably (60-80):(1-2):1:(1-2).

[0057] In the method described in this invention, in step (3), the mixture may further contain a diphenylamine antioxidant. The diphenylamine antioxidant can improve the weather resistance and durability of the coating, and can effectively prevent color changes and performance degradation caused by oxidation of the coating.

[0058] In the method described in this invention, the mass ratio of the base resin, the polyamide curing agent, the titanate coupling agent, the silicone resin adhesive, and the diphenylamine antioxidant can be (80-100):(2-5):(1-2):(1-3):1, preferably (85-95):(3-4):(1-2):(2-3):1.

[0059] In the method described in this invention, in step (3), the conditions for the second mixing include: a temperature of 30-60°C, preferably 35-55°C; a vacuum of -0.1 to -0.05 MPa, preferably -0.08 to -0.06 MPa; and a time of 20-50 min, preferably 20-40 min. The second mixing is carried out under stirring conditions, and the stirring speed of the second mixing is 100-150 rpm. The filtration is performed through a 50-80 mesh steel filter.

[0060] In the method described in this invention, in step (4), the mass ratio of the amounts of component A, component B and component C can be 1:(15-20):(4-7), preferably 1:(15-18):(5-6).

[0061] In the method described in this invention, in step (4), the conditions for the third mixing include: a temperature of 15-35°C, preferably 20-30°C; and a time of 25-55 min, preferably 30-40 min. The third mixing is carried out under stirring conditions, and the stirring speed of the third mixing is 100-150 rpm.

[0062] In some embodiments, the method for preparing the anti-corrosion coating of the present invention includes the following steps:

[0063] (1) The wind turbine blades are ball-milled to a mesh size of less than 200 mesh. The obtained wind turbine blade powder and organic solvent are subjected to a modification reaction at a temperature of 100-180℃ for 80-120 min. The solid phase components are separated by filtration. The solid phase components are then dried at a temperature of 60-100℃ for 1-3 h and photodegraded under ultraviolet light for 60-150 min to obtain component A.

[0064] (2) Under stirring conditions, coal-based resin, epoxy resin and petroleum resin are mixed at a temperature of 80-100℃ and a stirring speed of 40-100rpm for 35-60min to obtain the base resin.

[0065] (3) Under stirring conditions, the base resin, conductive filler, inorganic filler and hydrochloric acid corrosion inhibitor are first mixed for 20-50 minutes at a temperature of 80-100℃, a vacuum degree of -0.1 to -0.05MPa and a stirring speed of 100-150rpm, and then filtered. The filtrate obtained is component B.

[0066] (4) Under stirring conditions, the base resin, polyamide curing agent, titanate coupling agent and silicone resin adhesive are mixed for 20-50 minutes at a temperature of 30-60℃, a vacuum degree of -0.1 to -0.05MPa and a stirring speed of 100-150rpm. The resulting mixture is filtered and the filtrate is component C.

[0067] (5) Under stirring conditions, the components A, B and C are mixed for 25-55 minutes at a temperature of 15-35℃ and a stirring speed of 100-150 rpm.

[0068] In other embodiments, the method for preparing the anti-corrosion coating of the present invention includes the following steps:

[0069] (1) The wind turbine blades are ball-milled to a mesh size of less than 150 mesh. The obtained wind turbine blade powder and organic solvent are subjected to a modification reaction at a temperature of 120-150℃ for 80-100 min. The solid phase components are separated by filtration. The solid phase components are then dried at a temperature of 80-100℃ for 2-3 h and photodegraded under ultraviolet light for 80-120 min to obtain component A.

[0070] (2) Under stirring conditions, coal-based resin, epoxy resin and petroleum resin are mixed at a temperature of 90-100℃ and a stirring speed of 50-60rpm for 45-55min to obtain the base resin.

[0071] (3) Under stirring conditions, the base resin, conductive filler, inorganic filler and hydrochloric acid corrosion inhibitor are first mixed for 30-50 minutes at a temperature of 85-95℃, a vacuum degree of -0.09 to -0.07MPa and a stirring speed of 120-140rpm, and then filtered. The filtrate obtained is component B.

[0072] (4) Under stirring conditions, the base resin, polyamide curing agent, titanate coupling agent, silicone resin adhesive and diphenylamine antioxidant are mixed for 20-40 minutes at a temperature of 35-55℃, a vacuum degree of -0.08 to -0.06MPa and a stirring speed of 120-140rpm. The resulting mixture is filtered, and the filtrate is component C.

[0073] (5) Under stirring conditions, the components A, B and C are mixed for 30-40 minutes at a temperature of 20-30℃ and a stirring speed of 120-140 rpm.

[0074] This invention also provides an anti-corrosion coating prepared by the above-described method. The anti-corrosion coating according to this invention effectively improves the wear and corrosion resistance of coatings in low-temperature environments, and also provides a feasible method for the resource utilization of waste wind turbine blades.

[0075] The following examples further illustrate the anti-corrosion coating and its preparation method according to the present invention. These examples are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following examples.

[0076] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods in the art. Unless otherwise specified, the experimental materials used in the following embodiments are commercially available.

[0077] Example 1

[0078] (1) The wind turbine blades were ball-milled to a mesh size of less than 200 mesh. The resulting wind turbine blade powder and cyclohexanone (solid-liquid mass ratio of wind turbine blade powder to cyclohexanone was 3:1) were subjected to a modification reaction at 150°C for 100 min. The solid phase component was separated by filtering through a 60-mesh steel filter. The solid phase component was then dried at 90°C for 2 h and subjected to ultraviolet light (light source intensity of 150 μW / cm²). 2 Photodegradation was performed under light for 120 min to obtain component A;

[0079] (2) Under stirring conditions, coal-based resin, epoxy resin and petroleum resin (the mass ratio of coal-based resin, epoxy resin and petroleum resin is 1:1:1) are mixed at a temperature of 90℃ and a stirring speed of 50rpm for 35min until the mixed resin appears transparent to obtain the base resin.

[0080] (3) Under stirring conditions, the base resin, graphite powder, mica powder, titanium dioxide and hydrochloric acid corrosion inhibitor (the mass ratio of the base resin, graphite powder, mica powder, titanium dioxide and hydrochloric acid corrosion inhibitor is 95:3:1:0.5:0.5) are first mixed for 40 minutes at a temperature of 85℃, a vacuum degree of -0.08MPa and a stirring speed of 100rpm, and then filtered through a 60-mesh steel filter screen. The filtrate obtained is component B.

[0081] (4) Under stirring conditions, the base resin, polyamide curing agent, titanate coupling agent and silicone resin adhesive (the mass ratio of the base resin, polyamide curing agent, titanate coupling agent and silicone resin adhesive is 93:3.5:1.5:2) are mixed for 30 minutes at a temperature of 45℃, a vacuum degree of -0.07MPa and a stirring speed of 100rpm. The resulting mixture is filtered through a 60-mesh steel filter screen, and the filtrate is component C.

[0082] (5) Under stirring conditions, the components A, B and C (the mass ratio of the components A, B and C is 1:18:6) are mixed for a third time at a temperature of 25°C and a stirring speed of 100 rpm for 30 min.

[0083] Example 2

[0084] (1) The wind turbine blades were ball-milled to a mesh size of less than 150 mesh. The resulting wind turbine blade powder and dichloroethane (the solid-liquid mass ratio of wind turbine blade powder to dichloroethane was 4:1) were subjected to a modification reaction at 120°C for 80 min. The solid phase component was separated by filtering through a 60-mesh steel filter. The solid phase component was then dried at 80°C for 2 h and subjected to ultraviolet light (light source intensity of 200 μW / cm²). 2 Photodegradation for 80 min yielded component A;

[0085] (2) Under stirring conditions, coal-based resin, epoxy resin and petroleum resin (the mass ratio of coal-based resin, epoxy resin and petroleum resin is 3:3:4) are mixed at a temperature of 90℃ and a stirring speed of 50rpm for 35min until the mixed resin appears transparent to obtain the base resin.

[0086] (3) Under stirring conditions, the base resin, carbon black powder, diatomaceous earth, titanium dioxide and hydrochloric acid corrosion inhibitor (the mass ratio of the base resin, carbon black powder, diatomaceous earth, titanium dioxide and hydrochloric acid corrosion inhibitor is 95:3:1:0.5:0.5) are first mixed for 40 minutes at a temperature of 90℃, a vacuum degree of -0.08MPa and a stirring speed of 100rpm and then filtered through a 60-mesh steel filter screen. The filtrate obtained is component B.

[0087] (4) Under stirring conditions, the base resin, polyamide curing agent, titanate coupling agent, silicone resin adhesive and diphenylamine antioxidant (the mass ratio of the base resin, polyamide curing agent, titanate coupling agent, silicone resin adhesive and diphenylamine antioxidant is 92:3.5:1.5:2:1) are mixed for 30 minutes at a temperature of 45℃, a vacuum degree of -0.07MPa and a stirring speed of 100rpm. The resulting mixture is filtered through a 60-mesh steel filter screen, and the filtrate is component C.

[0088] (5) Under stirring conditions, the components A, B and C (the mass ratio of the components A, B and C is 1:15:5) are mixed for a third time at a temperature of 20°C and a stirring speed of 100 rpm for 35 min.

[0089] Example 3

[0090] (1) The wind turbine blades were ball-milled to a mesh size of less than 150 mesh. The resulting wind turbine blade powder and dichloroethane (the solid-liquid mass ratio of wind turbine blade powder to dichloroethane was 4:1) were subjected to a modification reaction at 120°C for 80 min. The solid phase component was separated by filtering through a 50-mesh steel filter. The solid phase component was then dried at 100°C for 3 h and subjected to ultraviolet light (light source intensity of 250 μW / cm²). 2 Photodegradation was performed under light for 120 min to obtain component A;

[0091] (2) Under stirring conditions, coal-based resin, epoxy resin and petroleum resin (the mass ratio of coal-based resin, epoxy resin and petroleum resin is 1:1.5:1.5) are mixed at a temperature of 90℃ and a stirring speed of 60rpm for 60min until the mixed resin appears transparent, thus obtaining the base resin.

[0092] (3) Under stirring conditions, the base resin, carbon black powder, diatomaceous earth, titanium dioxide and hydrochloric acid corrosion inhibitor (the mass ratio of the base resin, carbon black powder, diatomaceous earth, titanium dioxide and hydrochloric acid corrosion inhibitor is 60:2:0.5:0.5:0.2) are first mixed for 30 min at a temperature of 85℃, a vacuum degree of -0.09MPa and a stirring speed of 100rpm and then filtered through a 50-mesh steel filter. The filtrate obtained is component B.

[0093] (4) Under stirring conditions, the base resin, polyamide curing agent, titanate coupling agent, silicone resin adhesive and diphenylamine antioxidant (the mass ratio of the base resin, polyamide curing agent, titanate coupling agent, silicone resin adhesive and diphenylamine antioxidant is 85:3:1:2:1) are mixed for 20 minutes at a temperature of 35℃, a vacuum degree of -0.08MPa and a stirring speed of 100rpm. The resulting mixture is filtered through a 50-mesh steel filter screen, and the filtrate is component C.

[0094] (5) Under stirring conditions, the components A, B and C (the mass ratio of the components A, B and C is 1:15:5) are mixed for a third time at a temperature of 30°C and a stirring speed of 100 rpm for 45 min.

[0095] Example 4

[0096] (1) The wind turbine blades were ball-milled to a mesh size of less than 150 mesh. The resulting wind turbine blade powder and cyclohexanone (solid-liquid mass ratio of wind turbine blade powder and cyclohexanone was 4:1) were subjected to a modification reaction at 120°C for 80 min. The solid phase component was separated by filtering through a 50-mesh steel filter. The solid phase component was then dried at 100°C for 3 h and subjected to ultraviolet light (light source intensity of 150 μW / cm²). 2 Photodegradation was performed under light for 120 min to obtain component A;

[0097] (2) Under stirring conditions, coal-based resin, epoxy resin and petroleum resin (the mass ratio of coal-based resin, epoxy resin and petroleum resin is 1:1.5:1.5) are mixed at a temperature of 90℃ and a stirring speed of 60rpm for 35min until the mixed resin appears transparent, thus obtaining the base resin.

[0098] (3) Under stirring conditions, the base resin, carbon black powder, diatomaceous earth, titanium dioxide and hydrochloric acid corrosion inhibitor (the mass ratio of the base resin, carbon black powder, diatomaceous earth, titanium dioxide and hydrochloric acid corrosion inhibitor is 80:3:0.75:0.25:0.4) are first mixed for 30 minutes at a temperature of 85℃, a vacuum degree of -0.09MPa and a stirring speed of 50rpm, and then filtered through a 50-mesh steel filter. The filtrate obtained is component B.

[0099] (4) Under stirring conditions, the base resin, polyamide curing agent, titanate coupling agent, silicone resin adhesive and diphenylamine antioxidant (the mass ratio of the base resin, polyamide curing agent, titanate coupling agent, silicone resin adhesive and diphenylamine antioxidant is 95:4:2:3:1) are mixed for 20 minutes at a temperature of 35℃, a vacuum degree of -0.08MPa and a stirring speed of 50rpm. The resulting mixture is filtered through a 50-mesh steel filter screen, and the filtrate is component C.

[0100] (5) Under stirring conditions, the components A, B and C (the mass ratio of the components A, B and C is 1:15:5) are mixed for a third time at a temperature of 30°C and a stirring speed of 50 rpm for 60 min.

[0101] Example 5

[0102] (1) The wind turbine blades were ball-milled to a mesh size of 50-120. The resulting wind turbine blade powder and cyclohexanone (solid-liquid mass ratio of wind turbine blade powder to cyclohexanone was 3:1) were subjected to a modification reaction at 150℃ for 100 min. The solid phase component was separated by filtering through an 80-mesh steel filter. The solid phase component was then dried at 100℃ for 3 h and subjected to ultraviolet light (light source intensity of 300 μW / cm²). 2 Photodegradation for 80 min yielded component A;

[0103] (2) Under stirring conditions, coal-based resin, epoxy resin and petroleum resin (the mass ratio of coal-based resin, epoxy resin and petroleum resin is 1:1:1) are mixed at a temperature of 100℃ and a stirring speed of 60rpm for 35min until the mixed resin appears transparent to obtain the base resin.

[0104] (3) Under stirring conditions, the base resin, graphite powder, mica powder, titanium dioxide and hydrochloric acid corrosion inhibitor (the mass ratio of the base resin, graphite powder, mica powder, titanium dioxide and hydrochloric acid corrosion inhibitor is 80:3:0.75:0.25:0.4) are first mixed for 50 min at a temperature of 95℃, a vacuum degree of -0.07MPa and a stirring speed of 150rpm and then filtered through an 80-mesh steel filter screen. The filtrate obtained is component B.

[0105] (4) Under stirring conditions, the base resin, polyamide curing agent, titanate coupling agent and silicone resin adhesive (the mass ratio of the base resin, polyamide curing agent, titanate coupling agent and silicone resin adhesive is 80:2:1:2) are mixed for 40 minutes at a temperature of 55℃, a vacuum degree of -0.06MPa and a stirring speed of 150rpm. The resulting mixture is filtered through an 80-mesh steel filter screen, and the filtrate is component C.

[0106] (5) Under stirring conditions, the components A, B and C (the mass ratio of the components A, B and C is 1:18:6) are mixed for a third time at a temperature of 30°C and a stirring speed of 150 rpm for 55 min.

[0107] Example 6

[0108] (1) The wind turbine blades were ball-milled to a mesh size of less than 200 mesh. The resulting wind turbine blade powder and cyclohexanone (solid-liquid mass ratio of wind turbine blade powder to cyclohexanone was 3:1) were subjected to a modification reaction at 150°C for 100 min. The solid phase component was separated by filtering through a 60-mesh steel filter. The solid phase component was then dried at 90°C for 2 h and subjected to ultraviolet light (light source intensity of 300 μW / cm²).2 Photodegradation was performed under light for 120 min to obtain component A;

[0109] (2) Under stirring conditions, coal-based resin, epoxy resin and petroleum resin (the mass ratio of coal-based resin, epoxy resin and petroleum resin is 1:1:1) are mixed at a temperature of 90℃ and a stirring speed of 50rpm for 42min until the mixed resin appears transparent, thus obtaining the base resin.

[0110] (3) Under stirring conditions, the base resin, graphite powder, mica powder, titanium dioxide and hydrochloric acid corrosion inhibitor (the mass ratio of the base resin, graphite powder, mica powder, titanium dioxide and hydrochloric acid corrosion inhibitor is 60:2:0.5:0.5:0.2) are first mixed for 40 min at a temperature of 85℃, a vacuum degree of -0.08MPa and a stirring speed of 120rpm and then filtered through a 60-mesh steel filter screen. The filtrate obtained is component B.

[0111] (4) Under stirring conditions, the base resin, polyamide curing agent, titanate coupling agent and silicone resin adhesive (the mass ratio of the base resin, polyamide curing agent, titanate coupling agent and silicone resin adhesive is 60:1:1:1) are mixed for 30 minutes at a temperature of 45℃, a vacuum degree of -0.07MPa and a stirring speed of 120rpm. The resulting mixture is filtered through a 60-mesh steel filter screen, and the filtrate is component C.

[0112] (5) Under stirring conditions, the components A, B and C (the mass ratio of the amounts of components A, B and C is 1:18:6) are mixed for a third time for 20 minutes at a temperature of 25°C and a stirring speed of 120 rpm.

[0113] Example 7

[0114] The method described in Example 1 is implemented, except that the base resin, graphite powder, mica powder, titanium dioxide, and hydrochloric acid corrosion inhibitor (with a mass ratio of 95:3:1:0.5:0.5) are replaced with the same composition (95:3:1.5:0.5).

[0115] Comparative Example 1

[0116] The method described in Example 1 is implemented, except that step (1) is omitted. The specific steps are as follows:

[0117] (1) Under stirring conditions, coal-based resin, epoxy resin and petroleum resin (the mass ratio of coal-based resin, epoxy resin and petroleum resin is 1:1:1) are mixed at a temperature of 90℃ and a stirring speed of 50rpm for 35min until the mixed resin appears transparent to obtain the base resin.

[0118] (2) Under stirring conditions, the base resin, graphite powder, mica powder, titanium dioxide and hydrochloric acid corrosion inhibitor (the mass ratio of the base resin, graphite powder, mica powder, titanium dioxide and hydrochloric acid corrosion inhibitor is 95:3:1:0.5:0.5) are first mixed for 40 min at a temperature of 85℃, a vacuum degree of -0.08MPa and a stirring speed of 100rpm and then filtered through a 60-mesh steel filter. The filtrate obtained is component A.

[0119] (3) Under stirring conditions, the base resin, polyamide curing agent, titanate coupling agent and silicone resin adhesive (the mass ratio of the base resin, polyamide curing agent, titanate coupling agent and silicone resin adhesive is 93:3.5:1.5:2) are mixed for 30 minutes at a temperature of 45℃, a vacuum degree of -0.07MPa and a stirring speed of 100rpm. The resulting mixture is filtered through a 60-mesh steel filter screen, and the filtrate is component B.

[0120] (4) Under stirring conditions, the components A and B (the mass ratio of the components A and B is 3:1) are mixed for a third time at a temperature of 25°C and a stirring speed of 100 rpm for 30 min.

[0121] The impact resistance of Examples 1-7 and Comparative Example 1 was tested and recorded in Table 1. The specific test steps were performed in accordance with the national standard "Test Method for Impact Resistance of Coating Film" (GB / T1732-2020).

[0122] Table 1

[0123] Example number Impact resistance (N·cm) Example 1 55 Example 2 53 Example 3 52 Example 4 50 Example 5 49 Example 6 49 Example 7 51 Comparative Example 1 45

[0124] The results in Table 1 show that the anti-corrosion coating described in this invention exhibits good abrasion resistance in low-temperature environments, and also provides a feasible method for the resource utilization of waste wind turbine blades. Based on the comparison between Example 1 and Comparative Example 1, the coating prepared from modified wind turbine blade powder effectively improves impact resistance.

[0125] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for preparing an anti-corrosion coating, characterized in that, The method includes the following steps: (1) The wind turbine blade powder and organic solvent are modified to separate the solid phase component. The solid phase component is then dried and photodegraded to obtain component A. (2) The base resin, conductive filler, inorganic filler and hydrochloric acid corrosion inhibitor are mixed and filtered to obtain component B; (3) The base resin, polyamide curing agent, titanate coupling agent and silicone resin adhesive are mixed for the second time, and the resulting mixture is filtered. The filtrate is component C. (4) Mix the components A, B and C in a third mixing process; The base resin contains coal-based resin, epoxy resin, and petroleum resin; The organic solvent is at least one of cyclohexanone, dichloroethane, and tetrahydrofuran; In step (1), the conditions for photodegradation include: the light source is ultraviolet light, and the time is 60-150 min; The preparation process of the base resin includes: mixing the coal-based resin, the epoxy resin and the petroleum resin; The mass ratio of the coal-based resin, the epoxy resin, and the petroleum resin is 1:(1-2):(1-2); The conductive filler is graphite powder and / or carbon black powder; The inorganic filler is at least one of mica powder, diatomite and titanium dioxide; In step (4), the mass ratio of component A, component B and component C is 1:(15-20):(4-7).

2. The method according to claim 1, characterized in that, In step (1), the preparation process of the wind turbine blade powder includes ball milling the wind turbine blade to a mesh size of less than 200 mesh.

3. The method according to claim 1, characterized in that, In step (1), the solid-liquid mass ratio of the wind turbine blade powder and the organic solvent is (2-5):

1.

4. The method according to claim 3, characterized in that, In step (1), the conditions for the modification reaction include: a temperature of 100-180℃ and a time of 80-120min.

5. The method according to claim 1 or 2, characterized in that, The preparation process of the base resin is carried out under stirring conditions, which include: temperature of 80-100℃, stirring speed of 40-100rpm, and time of 35-60min.

6. The method according to claim 1, characterized in that, In step (2), the mass ratio of the base resin, the conductive filler, the inorganic filler and the hydrochloric acid corrosion inhibitor is (60-100):(1-3):1:(0.1-0.5).

7. The method according to claim 6, characterized in that, In step (2), the conditions for the first mixing include: a temperature of 80-100℃, a vacuum of -0.1 to -0.05MPa, and a time of 20-50min.

8. The method according to claim 6, characterized in that, In step (3), the mass ratio of the base resin, the polyamide curing agent, the titanate coupling agent and the silicone resin adhesive is (60-100):(1-3):1:(1-3).

9. The method according to claim 6, characterized in that, In step (3), the mixture also contains diphenylamine antioxidant.

10. The method according to claim 9, characterized in that, The mass ratio of the base resin, the polyamide curing agent, the titanate coupling agent, the silicone resin adhesive, and the diphenylamine antioxidant is (80-100):(2-5):(1-2):(1-3):

1.

11. The method according to any one of claims 6-10, characterized in that, In step (3), the conditions for the second mixing include: a temperature of 30-60°C, a vacuum of -0.1 to -0.05 MPa, and a time of 20-50 min.

12. An anti-corrosion coating prepared by the method according to any one of claims 1-11.