Modified biomass fiber for resin anticorrosive coating as well as preparation method and application of modified biomass fiber

Abstract

The invention relates to the technical field of biomass fibers, in particular to a modified biomass fiber for a resin anticorrosive coating as well as a preparation method and application of the modified biomass fiber, and the modified biomass fiber is a biomass fiber with a rare earth complex anchored on the surface; the rare earth complex is formed by combining rare earth metal ions serving as central ions with organic ligands through coordinate bonds; rare earth ions and organic ligands are grafted to the surfaces of the pretreated biomass fibers through chemical reaction, so that the binding capacity of the biomass fibers in resin can be improved, and the biomass fibers are endowed with fluorescence characteristics; and moreover, the biomass fibers subjected to fluorescence modification are doped into the resin coating, so that the integrity of the coating can be self-detected under ultraviolet light, and the effect of monitoring the resin coating in real time can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of biomass fibers, in particular to a modified biomass fiber for resin anticorrosive coating and a preparation method and application thereof. BACKGROUND

[0002] Biomass fibers are renewable and degradable fiber materials made from natural biomass such as plants, animals or microorganisms, etc. by physical, chemical or biological methods. They mainly include natural fibers such as cotton, hemp and wool directly taken from nature, and regenerated fibers such as viscose, lyocell and chitosan made by dissolution and regeneration process. Such fibers have environmental protection, biocompatibility and functionalization characteristics. Through modification, they can be endowed with antibacterial, conductive or fluorescent properties, and are widely used in green textiles, medical dressings, flexible electronics, reinforced coatings and other fields. In the current environment of pursuing green and sustainable development, fluorescent modified biomass fibers are a kind of fiber material with great development prospects.

[0003] Traditional biomass fiber pretreatment methods mainly include concentrated alkali, strong acid or oxidant treatment. These methods have technical drawbacks such as heavy environmental pollution, high energy consumption, great damage to the main structure of the fiber, and poor modification effect due to uneven treatment.

[0004] Resin coating is widely used in metal protection due to its excellent adhesion, chemical corrosion resistance and mechanical strength. However, internal damage of traditional resin coating is often difficult to detect with the naked eye when exposed to corrosive environments for a long time, until macroscopic failure occurs, increasing the risk of sudden safety hazards and maintenance costs. Existing monitoring techniques require external equipment and cannot achieve in-situ and visual early warning.

[0005] Therefore, how to apply biomass fibers to resin coating to develop coating materials with both reinforcing effect and corrosion response function has become a problem to be solved.

[0006] The information disclosed in this BACKGROUND section is only intended to enhance the understanding of the general background of the application and should not be taken as an acknowledgment or any form of suggestion that this information constitutes prior art. SUMMARY

[0007] To solve the above technical problems, the present application provides a modified biomass fiber for resin anticorrosive coating and a preparation method and application thereof. Rare earth ions and organic ligands are grafted to the surface of pretreated biomass fibers through chemical reaction, which not only increases the binding capacity of biomass fibers in resin, but also endows the biomass fibers with fluorescent properties. Furthermore, the fluorescent modified biomass fibers are doped into the resin coating, so that the coating can self-check the integrity of the coating under ultraviolet light, achieving real-time monitoring of the resin coating.

[0008] The first object of the present application is to provide a modified biomass fiber for resin anticorrosive coating, wherein the modified biomass fiber is a biomass fiber with a rare earth complex anchored on the surface thereof;

[0009] The rare earth complex is formed by a rare earth metal ion as a central ion and an organic ligand through a coordination bond.

[0010] The modified biomass fiber of the present application has the properties of degradability and renewability as a natural biomass fiber substrate, and can effectively overcome the disadvantages of non-degradability and difficult interface modification of traditional synthetic fibers.

[0011] As a preferred embodiment of the present application, the rare earth metal is any one of Eu, Tb, Sm or Dy; more specifically, the 4f electron transition energy levels of the above-mentioned rare earth metal ions are different, and the emitted light is also different, wherein Eu 3+ emits red light, Tb 3 + emits green light, Sm 3+ emits orange-red light, and Dy 3+ emits yellow light or blue light, and different light emitting colors and intensities can meet different use scenarios.

[0012] As a preferred embodiment of the present application, the organic ligand is 1,10-phenanthroline; more specifically, 1,10-phenanthroline as a classic bidentate chelating ligand can form a highly stable five-membered ring complex with the rare earth metal ion, and can efficiently transfer the ultraviolet light absorption energy to the rare earth metal ion through the antenna effect, so that the rare earth complex has the advantages of high brightness, long life, narrow emission and controllable emission.

[0013] As a preferred embodiment of the present application, the biomass fiber is any one of sugarcane fiber or bamboo fiber; more specifically, the surfaces of the above-mentioned two fibers are naturally rich in hydroxyl active groups, which can provide sufficient coordination anchoring sites for the rare earth complex, ensuring efficient and uniform loading of the rare earth complex.

[0014] The second object of the present application is to provide a preparation method of the above-mentioned modified biomass fiber for resin anticorrosive coating, comprising:

[0015] S1 washing the biomass fiber with anhydrous ethanol and drying; in the step, anhydrous ethanol can dissolve organic impurities such as lipids and waxes attached to the surface of the biomass fiber, achieving preliminary cleaning of the fiber surface, and ethanol has a dehydrating effect, which can remove free water molecules on the surface and inside the fiber, avoiding water interference in the subsequent coordination reaction of rare earth metal compounds and organic ligands, and the drying process can make the fiber dry, creating suitable conditions for subsequent full contact with the complex enzyme treatment solution and subsequent coordination reaction;

[0016] S2 putting the dried biomass fiber into the complex enzyme treatment solution, constant temperature water bath shaking, and obtaining the pretreated fiber; in the step, the residual sugars of the biomass fiber will compete for the binding sites with the rare earth metal ions, resulting in a decrease in the effective loading of the rare earth complex, and the enzymatic method can efficiently and gently remove the residual amorphous cellulose and pectin and other sugars on the surface of the biomass fiber, improving the loading of the rare earth complex; at the same time, constant temperature water bath shaking can make the fiber fully contact with the complex enzyme treatment solution, improving the sugar removal efficiency, and this process does not need to use strong chemicals such as concentrated alkali or strong acid, which can avoid damaging the main structure of the biomass fiber and maximize the retention of active hydroxyl groups on the fiber surface;

[0017] Preferably, the reaction is carried out at a water bath temperature of 45-55°C under oscillation conditions of 50-150 rpm for 1-3 h;

[0018] Preferably, after constant temperature water bath shaking, the system is heated in a 60°C water bath for 5-15 min, and then anhydrous ethanol is used for washing to completely inactivate the enzyme and terminate the reaction; then the treated fiber is washed with deionized water at 55-65°C until the washing liquid is neutral and clear, and finally, it is dried in a 55-65°C oven for 5-8 h to obtain the pretreated fiber with clean and activated surface;

[0019] S3 rare earth metal compounds, organic ligands and pretreated fibers are weighed according to the mass ratio of 0.5-1.4:0.4-0.8:1 respectively and dissolved in anhydrous ethanol; in this step, anhydrous ethanol can uniformly dissolve or disperse the rare earth metal compounds, organic ligands and pretreated fibers respectively, avoiding agglomeration of raw materials, laying a foundation for uniform mixing and sufficient reaction of the components;

[0020] The above mass ratio can not only avoid the precipitation problem caused by insufficient ligand, but also prevent the side reaction caused by excessive ligand, forming a stable rare earth complex;

[0021] S4 first mixing and stirring the rare earth metal compound solution and the pretreated fiber solution, and then slowly adding the organic ligand solution to the above solution to obtain the reaction solution; more specifically, the rare earth metal compound is a rare earth nitrate;

[0022] In this step, rare earth metal ions preferentially contact and adsorb onto the active hydroxyl groups exposed on the pretreated fiber surface, forming uniformly distributed rare earth ion anchoring points on the fiber surface. Subsequently, an organic ligand solution is slowly added, which allows the organic ligand to coordinate with the pre-adsorbed rare earth metal ions on the fiber surface in situ. This effectively avoids the organic ligand and rare earth metal ions reacting directly in the solution to form free rare earth complexes or precipitates, thereby significantly improving the loading efficiency and uniformity of rare earth complexes on the biomass fiber surface.

[0023] S5 The modified biomass fiber was prepared by reacting the solution to be reacted under stirring in a water bath;

[0024] In this step, a water bath is used to provide a mild and stable reaction temperature environment, avoiding thermal decomposition of biomass fibers due to high temperatures. At the same time, stirring ensures that the components in the reaction solution are in uniform contact, promoting the full progress of the coordination reaction and ensuring that the rare earth complex can be stably and uniformly anchored on the surface of the biomass fibers, ultimately forming modified biomass fibers with complete structure and excellent fluorescence properties.

[0025] As a preferred embodiment of the present invention, the specific method of step S1 is as follows: immerse the biomass fiber in anhydrous ethanol solution for 10-14 hours, then wash it with anhydrous ethanol and filter it, and dry it in an oven at 55-62°C for 2-4 hours.

[0026] As a preferred embodiment of the present invention, the method for preparing the compound enzyme treatment solution includes:

[0027] Q1. Prepare an acetate-sodium acetate buffer solution with a concentration of 0.05-0.15 mol / L and preheat it;

[0028] Preferably, the concentration of the acetate-sodium acetate buffer solution is 0.1 mol / L, the pH is 4.5–5.5, and the preheating temperature is 45–55°C;

[0029] If the concentration of the above-mentioned slow-release solution is too low, it will cause the pH value of the reaction system to shift during the enzyme reaction, deviating from the optimal pH range of the enzyme, thereby significantly reducing enzyme activity and reaction efficiency. A concentration of 0.1 mol / L can ensure that the enzyme molecules are in the optimal catalytic state. The above-mentioned pH range and temperature range match the activity requirements of pectinase and cellulase, which can avoid the enzyme activity reduction and inactivation due to pH imbalance or unsuitable temperature, so that the enzyme can maintain a high catalytic capacity.

[0030] Q2 Dissolve the enzyme powder in an acetate-sodium acetate buffer solution and stir until dissolved to obtain a composite enzyme treatment solution. In this step, the acetate-sodium acetate buffer solution serves as a dissolving carrier, which enables the enzyme powder to be evenly dispersed and fully dissolved to form a uniform composite enzyme treatment solution. This avoids enzyme powder agglomeration, which can lead to uneven local enzyme concentration. This ensures that when the enzyme comes into contact with biomass fiber in the future, it can act evenly on the fiber surface to degrade residual pectin and amorphous cellulose and other sugar impurities.

[0031] As a preferred embodiment of the present invention, the enzyme powder is pectinase and cellulase; more specifically, pectinase can specifically catalyze the degradation of pectin impurities on the fiber surface, and cellulase can specifically decompose amorphous cellulose.

[0032] The amount of pectinase added is 1.0–3.0 wt% and the amount of cellulase added is 0.5–1.5 wt% based on the percentage weight of the oven-dry weight of biomass fiber.

[0033] Preferably, the mass ratio of pectinase to cellulase is 1.5 to 3:1;

[0034] More specifically, the above-mentioned amount of added enzyme ensures sufficient enzyme quantity to thoroughly remove residual sugars on the fiber surface, avoiding both insufficient enzyme quantity leading to incomplete sugar removal and excessive enzyme quantity causing reagent waste. At the same time, it can prevent excessive enzyme from causing unnecessary degradation of the main fiber structure, thus ensuring the integrity of the fiber structure.

[0035] The mass ratio of pectinase to cellulase was set to 1.5 to 3:1. This mass ratio is consistent with the fact that the pectin content on the surface of biomass fiber is usually higher than that of amorphous cellulose, so that the two enzymes can be specifically matched with the proportion of impurity components to achieve synergistic and efficient degradation.

[0036] As a preferred embodiment of the present invention, the post-reaction processing method in S5 includes:

[0037] The modified biomass fiber after the reaction was completed was washed several times with anhydrous ethanol to remove unreacted rare earth metal compounds and organic ligands. Then it was filtered and dried in an oven at 58-62℃ for 5-8 hours.

[0038] In this step, the above temperature range can accelerate the coordination reaction between rare earth ions and ligands / fibers, while avoiding high temperature damage to the biomass fiber structure; the reaction time of 5-8 hours allows the rare earth complex to be fully generated and uniformly anchored on the surface of the biomass fiber, ultimately obtaining a modified material with high fluorescence efficiency, good dispersibility and intact fiber structure.

[0039] The third objective of this invention is to provide the application of the modified biomass fiber described above for resin anti-corrosion coating in resin coating, wherein the modified biomass fiber is mixed uniformly with resin, diluent and curing agent, and then coated onto a substrate and cured.

[0040] Rare earth ions, due to their unique 4f electron layer structure, can produce sharp characteristic emission spectra when transitioning to the 4f electron energy level. When electrons transition from the excited state back to the ground state, they release specific wavelength light with high color purity and high efficiency. This luminescence has advantages such as narrow spectral lines, stable color coordinates, and long fluorescence lifetime, giving modified biomass fibers highly efficient and sensitive fluorescence properties.

[0041] This invention incorporates modified biomass fibers into a resin coating, which allows for self-inspection of the coating's integrity under ultraviolet light, enabling real-time monitoring of the resin coating. Simultaneously, the biomass fibers form a network structure within the resin coating, increasing the diffusion path of corrosive media and delaying corrosion.

[0042] As a preferred embodiment of the present invention, the amount of modified biomass fiber added is 3 to 7% of the resin mass; more specifically, the above-mentioned addition amount can ensure obvious fluorescence effect, and avoid excessive addition leading to fiber agglomeration and a decrease in resin performance.

[0043] As a preferred embodiment of the present invention, butyl acetate is selected as the diluent and the amount added is 10-20% of the resin mass. The addition of the diluent can adjust the viscosity of the resin system and improve the processing performance. It can promote the uniform dispersion of biomass fibers in the resin and avoid agglomeration, and optimize the flowability of the coating during application.

[0044] As a preferred embodiment of the present invention, the amount of curing agent added is 15-20% of the resin mass, and the addition of the curing agent can enable the resin to fully cross-link and cure.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0046] (1) The modified biomass fiber of the present invention is synthesized by rare earth nitrate, organic ligand and biomass fiber through water bath stirring. This method can enable rare earth ions, organic ligand and biomass fiber to coordinate reaction simultaneously, realize the uniform anchoring of rare earth complex on the surface of biomass fiber. At the same time, the reaction temperature of 58 to 62°C can ensure the stability of the reaction, avoid excessive solvent volatilization and fiber degradation, and finally obtain modified biomass fiber with excellent fluorescence performance, interfacial bonding strength and environmentally friendly characteristics. In addition, the generated rare earth complex can improve the dispersibility of biomass fiber in resin, which is conducive to the uniform dispersion of fluorescent modified biomass fiber in resin.

[0047] (2) The resin coating prepared by this method not only forms a network structure in the resin coating, which can increase the diffusion path of corrosive media and delay corrosion, but also emits fluorescence under ultraviolet excitation, which can be used to monitor the integrity of the coating, and has great development prospects. Attached Figure Description

[0048] Figure 1 The images show the biomass fibers modified with rare earth complexes according to Example 1 of the present invention under sunlight (left) and ultraviolet light irradiation (right).

[0049] Figure 2 This is a scanning electron microscope image of the biomass fiber modified with rare earth complexes according to Example 1 of the present invention.

[0050] Figure 3 This is the fluorescence emission spectrum of biomass fiber modified with rare earth complexes in Example 1 of the present invention;

[0051] Figure 4 This is a flowchart illustrating the preparation of rare earth complex-modified biomass fiber-reinforced resin coatings according to the present invention. Detailed Implementation

[0052] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0053] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0054] The raw materials required for this specific implementation method are sourced from the following:

[0055] Acetic acid: Aladdin Reagent (Shanghai) Co., Ltd.

[0056] Sodium acetate: Aladdin Reagent (Shanghai) Co., Ltd.

[0057] Pectinase: Aladdin Reagent (Shanghai) Co., Ltd.

[0058] Cellulase: Aladdin Reagent (Shanghai) Co., Ltd.

[0059] Rare Earth Nitrates: Beijing Huawirui Chemical Technology Co., Ltd.

[0060] 1,10-Phenanthroline: Shanghai Zhanyun Chemical Co., Ltd.

[0061] Sugarcane fiber: Shaanxi Feister Biotechnology Co., Ltd.

[0062] Bamboo fiber: Shaoguan Hongshen Bamboo Industry Co., Ltd.

[0063] Fluorocarbon resins and curing agents: Shenzhou New Materials Co., Ltd.

[0064] Butyl acetate: Aladdin Biochemical Technology Co., Ltd.

[0065] Example 1

[0066] A modified biomass fiber for use in resin anti-corrosion coatings and a method for preparing the resin coating, wherein the biomass fiber is sugarcane fiber and the resin is DS301 fluorocarbon resin, comprising the following steps:

[0067] S1 pretreated sugarcane fiber:

[0068] Weigh 1g of sugarcane fiber and soak and wash the sugarcane fiber with anhydrous ethanol.

[0069] Prepare an acetate-sodium acetate buffer solution with a concentration of 0.1 mol / L, adjust its pH value to 5, and preheat it to 50°C; then add 2% pectinase and 1% cellulase by weight of sugarcane fiber to the preheated acetate-sodium acetate buffer solution, and slowly stir until the enzyme preparation is completely dissolved to form a uniform composite enzyme treatment solution.

[0070] Finally, the sugarcane fiber, after being washed with anhydrous ethanol, was immersed in the compound enzyme treatment solution and reacted for 2 hours under controlled conditions of 50°C and 100 rpm.

[0071] After the reaction is complete, place the system in a 60°C water bath and heat for 10 minutes to completely inactivate the enzyme, then rinse with anhydrous ethanol.

[0072] Next, the treated sugarcane fiber was thoroughly washed with deionized water at 60°C until the washing liquid was neutral and clear. Finally, it was dried in an oven at 60°C for 6 hours to obtain clean and activated sugarcane fiber.

[0073] S2 preparation of fluorescent sugarcane fibers:

[0074] Weigh out 0.9 g of europium nitrate hexahydrate, 0.6 g of 1,10-phenanthroline, and 1 g of sugarcane fiber obtained in step S1;

[0075] The above three components were dissolved in 30 mL of anhydrous ethanol to obtain solution A (europium nitrate), solution B (1,10-phenanthroline), and solution C (sugarcane fiber). Solution C was poured into solution A and stirred thoroughly with a glass rod. Then, solution B was poured into solution A to obtain the reaction solution.

[0076] The solution to be reacted was placed in a beaker, and then the beaker was placed in a 60°C water bath and magnetically stirred for 6 hours. After the reaction was completed, the beaker was removed, the reaction product was washed with anhydrous ethanol, filtered, and dried in a 60°C oven for 6 hours to obtain fluorescent sugarcane fiber.

[0077] S3 mixes fluorocarbon resin, DS301 fluorocarbon resin curing agent with an addition amount of 15% of the fluorocarbon resin mass, butyl acetate with an addition amount of 10% of the fluorocarbon resin mass, and fluorescent sugarcane fiber with an addition amount of 5% of the fluorocarbon resin mass evenly, and stirs continuously with a glass rod until the fluorescent sugarcane fiber is evenly dispersed in the resin to obtain a composite resin coating.

[0078] S4 involves uniformly coating the composite resin coating obtained in S3 onto the substrate and allowing it to cure naturally to obtain a rare earth complex modified sugarcane fiber reinforced fluorocarbon resin coating.

[0079] The color morphology of the prepared fluorescent sugarcane fiber material under sunlight and ultraviolet light irradiation is as follows: Figure 1 As shown, the left side shows the color morphology under sunlight, and the right side shows the color morphology under ultraviolet irradiation. Under ultraviolet irradiation, the fluorescent sugarcane fiber emits bright red light; the microstructure of the prepared fluorescent sugarcane fiber material under a scanning electron microscope is shown below. Figure 2 As shown; Figure 3 The image shows the fluorescence emission spectrum of fluorescent sugarcane fiber, with wavelength on the horizontal axis and intensity on the vertical axis. The excitation wavelength is 356 nm, and the maximum emission peak is located at 616 nm. This indicates that the fluorescent sugarcane fiber has good fluorescence intensity under ultraviolet excitation at 356 nm, suggesting that the fluorescent sugarcane fiber has an indicative function and can be used to monitor the integrity of the coating.

[0080] Example 2

[0081] Unlike Example 1, Example 2 uses an equal amount of terbium nitrate hexahydrate instead of europium nitrate hexahydrate in Example 1.

[0082] Example 3

[0083] Unlike Example 2, Example 3 uses bamboo fiber instead of sugarcane fiber in Example 1, uses E51 epoxy resin instead of DS301 fluorocarbon resin in Example 1, and correspondingly, the fluorocarbon resin curing agent is also replaced with 593 epoxy resin curing agent.

[0084] Comparative Example 1:

[0085] Unlike Example 1, Comparative Example 1 used wheat straw fiber instead of sugarcane fiber in Example 1. After fluorescence spectroscopy analysis, the fluorescence intensity of the obtained fluorescent modified wheat straw fiber at 2800 a.u. was much worse than that of sugarcane fiber at 6200 a.u. This is because there is a silicone waxy barrier on the surface of wheat straw fiber, which leads to a significant reduction in rare earth loading.

[0086] Comparative Example 2:

[0087] Unlike Example 1, Comparative Example 2 used coconut shell fiber instead of sugarcane fiber in Example 1. After fluorescence spectroscopy analysis, the fluorescence intensity of the modified coconut shell fiber (1700 a.u.) was much worse than that of sugarcane fiber (6200 a.u.). This is because coconut shell fiber has a dense structure and extremely high lignin content, and is chemically inert, resulting in a significant reduction in rare earth loading.

[0088] Comparative Example 3:

[0089] Unlike Example 1, in Comparative Example 3, the sugarcane fiber that had been washed with anhydrous ethanol was not immersed in the compound enzyme treatment solution for enzymatic hydrolysis. The fluorescence intensity of the resulting sugarcane fiber decreased by about 40%. This is because the surface of the sugarcane fiber that has not been washed with ethanol will have residual impurities such as sugar, lipids and wax, which will inhibit enzyme activity and prevent it from effectively contacting the fiber substrate to carry out the enzymatic hydrolysis reaction.

[0090] Comparative Example 4:

[0091] Unlike Example 2, Comparative Example 4 mixed solutions A, B, and C together simultaneously, resulting in a reduction of approximately 60% in the fluorescence intensity of the prepared fluorescent sugarcane fiber. This reduction in fluorescence intensity was visible to the naked eye. This is because mixing the three solutions together simultaneously causes rare earth ions to react with organic ligands first to form free rare earth complexes, leading to a reduction in the rare earth loading on the sugarcane fiber.

[0092] Comparative Example 5:

[0093] Unlike Example 2, Comparative Example 5 used benzoic acid organic ligands, and the fluorescence intensity of the fluorescent sugarcane fiber prepared was only 15% of that of Example 2. Moreover, the fluorescence was unstable and prone to quenching. This is because benzoic acid has low energy transfer efficiency and its complex structure is loose, which cannot effectively prevent water molecules from coordinating with europium ions, resulting in severe quenching of fluorescence. The luminescence intensity and stability are far inferior to those of the o-phenanthroline system.

[0094] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A modified biomass fiber for use in resin anti-corrosion coatings, characterized in that, The modified biomass fiber is a biomass fiber with rare earth complexes anchored on its surface; The rare earth complex is formed by rare earth metal ions as central ions and organic ligands through coordination bonds.

2. The modified biomass fiber for resin anti-corrosion coating as described in claim 1, characterized in that, The rare earth metal is any one of Eu, Tb, Sm, or Dy.

3. The modified biomass fiber for resin anti-corrosion coating as described in claim 1, characterized in that, The organic ligand is 1,10-phenanthroline.

4. The modified biomass fiber for resin anti-corrosion coating as described in claim 1, characterized in that, The biomass fiber is either sugarcane fiber or bamboo fiber.

5. The method for preparing modified biomass fibers for resin anti-corrosion coatings as described in any one of claims 1-4, characterized in that, include: S1 uses anhydrous ethanol to clean and then dry the biomass fiber; S2 involves adding the dried biomass fiber into a compound enzyme treatment solution and shaking it in a constant-temperature water bath to obtain pretreated fiber. S3 was weighed out in a mass ratio of 0.5–1.4:0.4–0.8:1, and then dissolved in anhydrous ethanol. S4 First, the rare earth metal compound solution and the pretreated fiber solution are mixed and stirred. Then, the organic ligand solution is slowly added dropwise to the above solution to obtain the reaction solution. S5 reacts the solution to be reacted under stirring in a water bath to obtain the modified biomass fiber.

6. The method for preparing modified biomass fibers for resin anti-corrosion coatings as described in claim 5, characterized in that, The preparation method of the compound enzyme treatment solution includes: Q1. Prepare an acetate-sodium acetate buffer solution with a concentration of 0.05-0.15 mol / L and preheat it; Q2 Dissolve the enzyme powder in an acetate-sodium acetate buffer solution and stir until dissolved to obtain a composite enzyme treatment solution.

7. The method for preparing modified biomass fibers for resin anti-corrosion coatings as described in claim 5, characterized in that, The enzyme powder is pectinase and cellulase; The amount of pectinase added is 1.0~3.0 wt% and the amount of cellulase added is 0.5~1.5 wt% based on the percentage of the oven-dry weight of the biomass fiber.

8. The method for preparing modified biomass fibers for resin anti-corrosion coatings as described in claim 5, characterized in that, The post-reaction processing method in S5 includes: The modified biomass fiber after the reaction was completed was washed multiple times with anhydrous ethanol to remove unreacted rare earth metal compounds and organic ligands, then filtered and dried in an oven at 58~62℃.

9. The application of the modified biomass fiber for resin anti-corrosion coating as described in any one of claims 1-4 in resin coating, characterized in that, The modified biomass fiber is mixed evenly with resin, diluent and curing agent, and then coated onto the substrate and cured.

10. The application of the modified biomass fiber for resin anti-corrosion coating as described in claim 9, characterized in that, The amount of modified biomass fiber added is 3-7% of the resin mass.

Images