Protective agent and preparation method thereof

Abstract

The invention discloses a protective agent and a preparation method thereof.The protective agent comprises a component A and a component B. The component A comprises, by weight, 80-90 parts of epoxy resin; 1-2 parts of an antioxidant; 1.5 to 3 parts of a coupling agent; 4-6 parts of a toughening agent; 1-2 parts of a light stabilizer; 0.1 to 1 part of an accelerant; the component B comprises 100 parts of a modified fixing agent. The protective agent has excellent mechanical strength and weather resistance, and can effectively prolong the service life of a protected object.

Description

Technical Field

[0001] The invention relates to the field of external and internal protection of buildings, rocks, tunnels, bridges, mines and the like, and in particular to a protective agent and a preparation method thereof. Background Art

[0002] Polymer-reinforced solid porcelain glue protective agent is an advanced surface protection material, mainly composed of polymer compounds, which can form a solid protective layer to protect the surface of various materials from environmental erosion and physical damage. This protective agent has the advantages of strong weather resistance, waterproof and anti-fouling, high transparency, and simple construction. It is suitable for many fields such as construction, automobiles, and electronic products, and improves the durability and aesthetics of the surface.

[0003] However, under certain conditions, some polymer materials may yellow or crack due to ultraviolet radiation or chemical reactions, affecting the appearance and stability of the protected object. Under extreme environmental conditions or after long-term use, the protective layer may deteriorate or fail, requiring regular maintenance and re-coating.

[0004] Therefore, developing a protective agent with excellent mechanical strength and weather resistance plays an important role, is of great significance to avoiding catastrophic accidents and improving the quality of projects, which undoubtedly has good social and economic benefits. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art to a certain extent. To this end, the present invention provides a protective agent and a preparation method thereof. The protective agent has excellent mechanical strength and weather resistance and can effectively extend the service life of the protected object.

[0006] Therefore, in the first aspect of the present invention, the present invention provides a protective agent, the protective agent comprises component A and component B, and component A comprises the following substances in parts by weight:

[0007]

[0008]

[0009] The B component includes 100 parts of a modified fixing agent.

[0010] The protective agent of the present invention is prepared by using two components. The epoxy resin, antioxidant, toughening agent, light stabilizer and other ingredients in component A not only provide the protective agent with excellent chemical resistance and mechanical strength, but also have good transparency, adhesion, flexibility and stability, and can also protect the protective agent from damage by ultraviolet rays and improve its weather resistance. The modified fixing agent of component B can adjust the heat resistance, cold resistance and chemical corrosion resistance of the material, making it suitable for different environmental conditions. As a result, the protective agent has excellent mechanical strength and weather resistance, and can effectively extend the service life of the protected object.

[0011] In some embodiments, the weight ratio of component A to component B is (1-3):1.

[0012] In some embodiments, the epoxy resin includes tetrafunctional glycidylamines.

[0013] In some embodiments, the antioxidant includes benzotriazoles.

[0014] In some embodiments, the coupling agent includes at least one of 3-(trimethoxysilyl)propyl methacrylate, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, and γ-aminopropyltriethoxysilane.

[0015] In some embodiments, the toughening agent includes at least one of γ-(2,3-glycidoxy)propyltrimethoxysilane, N-β-aminoethyl-γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, and 3-glycidoxypropyltri(2-methoxyethoxy)silane.

[0016] In some embodiments, the light stabilizer includes light stabilizer 944 and light stabilizer 770 , and the mass ratio of light stabilizer 944 to light stabilizer 770 is 1:1.

[0017] In some embodiments, the accelerator comprises an organosilicone derivative.

[0018] In some embodiments, the modified curing agent includes a phenalkamine epoxy curing agent.

[0019] In a second aspect of the present invention, the present invention provides a method for preparing a protective agent, comprising the following steps:

[0020] Mixing epoxy resin, antioxidant, coupling agent, toughening agent, light stabilizer and accelerator to obtain component A;

[0021] Mixing component A and component B to prepare a mixture;

[0022] The mixture is sprayed on the surface of the substrate and cured;

[0023] In some embodiments, component B includes a modified fixative;

[0024] In some embodiments, the spraying temperature is 20-30°C and the spraying time is 25-35 minutes;

[0025] In some embodiments, curing includes at least one of heat curing and room temperature curing;

[0026] In some specific embodiments, the temperature of heating and curing is 55-65° C., and the time is 2-3 hours;

[0027] In some specific embodiments, the room temperature curing temperature is 20-30° C., and the curing time is 24-48 hours.

[0028] According to an embodiment of the present invention, the temperature of the sprayed substrate directly affects the quality, adhesion and compactness of the coating. Therefore, when the spraying temperature is 20-30°C and the time is 25-35 minutes, the appropriate substrate temperature contributes to the good bonding between the coating and the substrate, and improves the durability and stability of the protective agent coating. After the spraying is completed, it is further cured to improve the adhesion of the coating and reduce the peeling and shedding of the coating. As a result, the protective agent has excellent mechanical strength and weather resistance, and can effectively extend the service life of the protected object.

[0029] In some embodiments, component A includes the following raw materials, by weight:

[0030] Epoxy resin, 80-90 parts; antioxidant, 1-2 parts; coupling agent, 1.5-3 parts; toughening agent, 4-6 parts; light stabilizer, 1-2 parts; accelerator, 0.1-1 part;

[0031] Component B includes 100 parts of a modified fixing agent.

[0032] In some embodiments, in the mixture, the weight ratio of component A to component B is (1-3):1.

[0033] Compared with the prior art, the present invention has the following beneficial technical effects:

[0034] The protective agent provided by the present invention is prepared by using two components. First, the protective agent has a low shrinkage rate, which helps to maintain the overall stability after curing; second, the exothermic temperature during the curing process is low, which is conducive to avoiding the thermal stress effect on the substrate; in addition, the transparency after curing is high, so that it can be used in occasions where visual transparency needs to be maintained. At the same time, the protective agent also has excellent mechanical strength and weather resistance, effectively extending the service life of the protected object.

[0035] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0037] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Further, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0038] The endpoints and any values ​​of the ranges disclosed in this article 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 each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0039] In this document, the terms “include” or “comprising” are open expressions, that is, including the contents specified in the present invention but not excluding other contents.

[0040] In a first aspect of an embodiment of the present invention, the present invention provides a protective agent, the protective agent comprising component A and component B, wherein component A comprises the following substances in parts by weight:

[0041]

[0042] The B component includes 100 parts of a modified fixing agent.

[0043] The protective agent of the present invention is prepared by two components. The protective agent of the present invention is prepared by two components. The epoxy resin, antioxidant, toughening agent, light stabilizer and other ingredients in component A not only provide the protective agent with excellent chemical resistance and mechanical strength, but also have good transparency, adhesion, flexibility and stability, and can also protect the protective agent from damage by ultraviolet rays and improve its weather resistance. The modified fixing agent of component B can adjust the heat resistance, cold resistance and chemical corrosion resistance of the material, making it suitable for different environmental conditions. In paints and coatings, the modified fixing agent can improve the adhesion, weather resistance and scratch resistance of the coating. As a result, the protective agent has excellent mechanical strength, weather resistance and transparency, and can effectively extend the service life of the protected object.

[0044] In some embodiments of the present invention, the weight ratio of component A to component B is (1-3):1.

[0045] This further improves the mechanical strength and weather resistance of the protective agent.

[0046] As an example, the weight ratio is 1:1, 1.5:1, 2:1, 2.5:1, 3:1, etc.

[0047] In some embodiments of the present invention, the epoxy resin includes tetrafunctional glycidylamines.

[0048] According to an embodiment of the present invention, epoxy resin has excellent chemical resistance, can resist corrosion by a variety of chemical substances, including acids, alkalis, solvents, salts, etc., and can also improve the mechanical strength and adhesion of the protective agent. In addition, epoxy resin is a high molecular polymer. In a two-component epoxy resin system, epoxy resin is used as a base resin, which is mixed with component B and then cured to form a transparent adhesive layer with excellent impact resistance and excellent transparency. The curing process of epoxy resin is usually accompanied by volume shrinkage, but by selecting a suitable fixing agent and adding specific fillers, the shrinkage rate can be significantly reduced. As a result, the protective agent has excellent mechanical strength, weather resistance, transparency and heat shrinkage, and can effectively extend the service life of the protected object.

[0049] As an example, the tetrafunctional glycidylamines include at least one of tetraaminoglycidyl (TGA), tetraglycidyl-1,3-diaminopropane (TGAP), tetraglycidyldiaminodiphenylmethane (TGDDM), and triglycidyl triisocyanate (TGIC).

[0050] In some embodiments of the present invention, the antioxidant includes benzotriazole.

[0051] According to the embodiment of the present invention, the antioxidant can inhibit the reaction between the protective agent and oxygen molecules and reduce the probability of oxidation. Therefore, the protective agent has excellent antioxidant properties, thereby extending the service life of the protective agent coating.

[0052] As an example, the benzotriazoles include at least one of benzotriazole, N-alkyl-5-seleno-1,2,3-triazole, and 1,3,4-triaryl-1,2,3-triazole salts.

[0053] In some embodiments of the present invention, the coupling agent includes at least one of 3-(trimethoxysilyl)propyl methacrylate, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, and γ-aminopropyltriethoxysilane.

[0054] According to the embodiments of the present invention, the coupling agent can be used to treat inorganic fillers such as white carbon black, talc, and clay to improve their adhesion to epoxy resin, increase water resistance, and reduce curing temperature. As a result, the protective agent has excellent mechanical strength and weather resistance, and can effectively extend the service life of the protected object.

[0055] In some embodiments of the present invention, the toughening agent includes at least one of γ-(2,3-epoxypropyl)propyltrimethoxysilane, N-β-aminoethyl-γ-aminopropyltrimethoxysilane, γ-glycidyloxypropyltriethoxysilane, and 3-glycidyloxypropyltri(2-methoxyethoxy)silane.

[0056] According to the embodiments of the present invention, the toughening agent can increase the flexibility of the coating film, reduce its brittleness, and improve its impact resistance and crack resistance, which is particularly important for applications that need to withstand impact or bending; the toughening agent can also improve the adhesion between the coating and the substrate, reduce the possibility of peeling and falling off, and improve the stability of the coating. Therefore, the protective agent has excellent mechanical strength and weather resistance, and can effectively extend the service life of the protected object.

[0057] In some embodiments of the present invention, the light stabilizer includes light stabilizer 944 and light stabilizer 770 , and the mass ratio of light stabilizer 944 to light stabilizer 770 is 1:1.

[0058] According to the embodiments of the present invention, the main function of the light stabilizer is to protect the coating from light oxidation or light aging, significantly improve the weather resistance of the coating, and extend the service life of the coating film.

[0059] In some embodiments of the present invention, the accelerator comprises an organosiloxane derivative.

[0060] According to the embodiments of the present invention, the accelerator can interact with each other at the interface between the paint and the substrate to form a network structure in which the silane and the paint base interpenetrate each other, thereby enhancing the cohesive force and the stability against water erosion. Therefore, the protective agent has excellent stability and weather resistance.

[0061] As an example, the organosiloxane derivative includes at least one of isopropyl tri(acetylacetonato)titanate and methacrylic acid.

[0062] In some embodiments of the present invention, the modified curing agent includes a phenalkamine epoxy curing agent.

[0063] According to the embodiments of the present invention, the modified fixing agent can adjust the heat resistance, cold resistance and chemical corrosion resistance of the material, making it suitable for different environmental conditions. In paints and coatings, the modified fixing agent can improve the adhesion, weather resistance and scratch resistance of the coating. As a result, the protective agent has excellent mechanical strength and weather resistance, and can effectively extend the service life of the protected object.

[0064] As an example, the modified fixing agent includes at least one of phenolic resin and carbitol-modified phenolic amine.

[0065] In a second aspect of the embodiments of the present invention, the present invention provides a method for preparing a protective agent, comprising the following steps:

[0066] Mixing epoxy resin, antioxidant, coupling agent, toughening agent, light stabilizer and accelerator to obtain component A;

[0067] Mixing component A and component B to prepare a mixture;

[0068] The mixture is sprayed on the surface of the substrate and cured;

[0069] In some embodiments of the present invention, component B includes a modified fixative;

[0070] In some embodiments of the present invention, the spraying temperature is 20-30° C. and the spraying time is 25-35 min.

[0071] According to the embodiment of the present invention, the temperature of the substrate to be sprayed directly affects the quality, adhesion and compactness of the coating. Therefore, when the spraying temperature is 20-30°C and the time is 25-35 minutes, the appropriate substrate temperature is conducive to the good combination between the coating and the substrate, and improves the durability and stability of the protective agent coating. As a result, the protective agent has excellent mechanical strength and weather resistance.

[0072] As an example, the temperature of spraying is 20°C, 22°C, 24°C, 26°C, 28°C, 30°C, etc.

[0073] As an example, the spraying time is 25 min, 27 min, 29 min, 31 min, 33 min, 35 min, etc.

[0074] In some embodiments of the present invention, curing includes at least one of heat curing and room temperature curing.

[0075] According to an embodiment of the present invention, after spraying, it is further cured to improve the adhesion of the coating and reduce the peeling and shedding of the coating. As a result, the protective agent has excellent mechanical strength, weather resistance and transparency, and can effectively extend the service life of the protected object.

[0076] In some specific embodiments of the present invention, the temperature of heating and curing is 55-65° C., and the time is 2-3 hours.

[0077] As an example, the temperature of heat curing is 55° C., 57° C., 59° C., 61° C., 63° C., 65° C., etc.

[0078] As an example, the time for heating and curing is 2h, 2.2h, 2.4h, 2.6h, 2.8h, 3h, etc.

[0079] In some specific embodiments of the present invention, the room temperature curing temperature is 20-30° C., and the curing time is 24-48 hours.

[0080] As an example, the temperature of room temperature curing is 20°C, 22°C, 24°C, 26°C, 28°C, 30°C, etc.

[0081] As an example, the room temperature curing time is 24h, 28h, 32h, 36h, 40h, 44h, 48h, etc.

[0082] In some embodiments of the present invention, component A includes the following raw materials in parts by weight:

[0083] Epoxy resin, 80-90 parts; antioxidant, 1-2 parts; coupling agent, 1.5-3 parts; toughening agent, 4-6 parts; light stabilizer, 1-2 parts; accelerator, 0.1-1 part;

[0084] Component B includes 100 parts of a modified fixing agent.

[0085] In some embodiments of the present invention, in the mixture, the weight ratio of component A to component B is (1-3):1.

[0086] As an example, the weight ratio is 1: 1, 1.5: 1, 2: 1, 2.5: 1, 3: 1, etc. The scheme of the present invention will be explained below in conjunction with the examples. Those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. If no specific technology or conditions are specified in the examples, the technology or conditions described in the literature in this field or the product instructions are used. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be obtained commercially.

[0087] In the following examples, the raw materials used are from:

[0088] The epoxy resin is a high-content epoxy resin of model AG-80 provided by Shanghai Huayi (Group) Company;

[0089] The antioxidant is UV-1130 provided by Hebei Tianyu Company;

[0090] The coupling agent is a coupling agent of model KH-570 provided by Nanjing Guoguang Company;

[0091] The toughening agent is a toughening agent of model KH-560 provided by Nanjing Guoguang Company;

[0092] The light stabilizer is UV-791 provided by Hebei Tianyu Company;

[0093] The accelerator is an adhesion accelerator model DA-222 provided by Wanjun Chemical Company;

[0094] Embodiment 1:

[0095] (1) Prepare the protective agent component A and component B of the present invention according to the formulation in Table 1 below.

[0096] Table 1 Example 1 Protective agent composition formula

[0097]

[0098] (2) Component A and component B are weighed in a weight ratio of component A: component B = 2:1, and mixed evenly in a mixer to obtain a mixture.

[0099] (3) Spray the mixture on the surface of the base material at 25°C within 30 minutes, and then heat and cure at 60°C for 3 hours. During the curing process, please keep the environment clean to prevent impurities from falling onto the surface of the glue. The protective agent of the present invention is obtained.

[0100] Performance testing of protective agents

[0101] 1. Detection method:

[0102] 1. Hardness test:

[0103] (1) Clean the sample surface: Make sure the sample surface is clean to avoid dirt or oil stains that may affect the test results.

[0104] (2) Select test points: Select multiple representative test points to avoid testing too close to the edge of the sample.

[0105] (3) Place the hardness tester perpendicular to the sample surface: Place the probe of the Shore D hardness tester perpendicular to the sample surface, ensuring that the probe is in contact with the sample surface.

[0106] (4) Applying pressure: Press the hardness tester so that the hard tip of the probe contacts the sample surface, usually applying a certain amount of pressure.

[0107] (5) Read the hardness value: Keep the durometer in contact with the sample for about 2 seconds and read the hardness value on the durometer. This value indicates the hardness of the material surface and the unit is Shore D.

[0108] (6) Multiple tests: To ensure the reliability of the test, three measurements are performed in different areas of the sample. Usually at least three points are tested and the average value is taken.

[0109] 2. Shear strength (Fe-Fe, MPa) test:

[0110] (1) Specimen size: Prepare specimens of appropriate size (50 mm × 50 mm) according to the standard.

[0111] (2) Specimen surface treatment: The specimen surface should be smooth and free of cracks, defects or contaminants. The surface should be as uniform as possible.

[0112] (3) Place the sample: Place the sample in the shear box and ensure that the initial state of the sample can remain stable.

[0113] (4) Assemble the shear device: The upper and lower parts of the shear box should be tightly combined. The upper part is used to apply the load, and the lower part is used to measure the shear displacement of the specimen.

[0114] (5) Loading rate: Select an appropriate loading rate based on the test standard and material properties. The loading rate is 0.2 mm / min to avoid excessive deformation of the specimen in a short period of time.

[0115] (6) Displacement sensor: Ensure that the displacement sensor can accurately measure the shear displacement of the specimen.

[0116] (7) Applying normal load: First, apply a normal load of 90 kPa, which is maintained throughout the test to simulate the actual pressure.

[0117] (8) Apply shear load: Start the shear tester and gradually apply shear load until the specimen fails in shear. During the loading process, the specimen will slip along the preset shear plane, resulting in changes in shear stress and shear displacement.

[0118] (9) Record load and displacement: During the loading process, record the shear displacement and load value corresponding to each loading stage. This data will be used for subsequent shear strength calculations.

[0119] 3. Curing shrinkage (%) test:

[0120] (1) Mold selection: Select a suitable mold to ensure that the specimen has the appropriate shape and size after curing.

[0121] (2) Sample preparation: Mix the raw materials according to the specified ratio and pour them into the mold. For resin materials, ensure that the mixture is evenly mixed to avoid bubbles affecting the test results.

[0122] (3) Measuring dimensions: Before the material begins to solidify, use tools such as calipers and measuring instruments to measure the length, width and height (or diameter) of the specimen.

[0123] (4) Curing condition control: Place the sample in a curing oven or other control equipment and cure it at specified temperature and humidity.

[0124] (5) Observe the curing process: During the curing process, the changes in the material should be checked regularly and the start and end time of curing should be recorded.

[0125] (6) Remove the sample: After curing is completed, remove the sample and allow it to cool naturally to avoid temperature changes affecting dimensional measurement.

[0126] (7) Measure the size after curing: Use the same tools (such as calipers, three-dimensional measuring instruments, etc.) to accurately measure the size after curing.

[0127] (8) Calculation of shrinkage rate: Calculate the shrinkage rate of the sample based on the measured dimensions before and after curing.

[0128] 4. Dielectric loss tangent (1.2Mhz, 25℃) detection:

[0129] Use a dielectric loss tester or a dielectric constant tester to test. These instruments can measure the loss of a material under the action of an electric field at a specific frequency.

[0130] (1) Sample size: Cut the material to be tested into a size suitable for the test, which is a round slice with a thickness generally within 5 mm.

[0131] (2) Clean the sample: Make sure there is no dust, oil or other impurities on the sample surface.

[0132] (3) Frequency setting: Set the frequency of the test instrument to 1.2 MHz.

[0133] (4) Temperature control: Ensure that the temperature of the test environment is 25°C.

[0134] (5) Electric field strength: Set the appropriate electric field strength.

[0135] (6) Measuring dielectric loss: Clamp the sample between the test electrodes of the tester to ensure good contact between the sample and the electrodes. Start the instrument for testing. The instrument will apply a high-frequency electric field and measure the capacitance value and the conductivity value or loss factor of the medium. The instrument will calculate the dielectric loss tangent value based on the measured capacitance and conductivity values.

[0136] 5. Appearance inspection:

[0137] (1) Lighting conditions: When conducting appearance inspection, ensure that the light is sufficient and uniform and conduct the inspection under natural light.

[0138] (2) Background selection: Choose a background that contrasts sharply with the sample color. Usually a white or black background is used, which helps improve transparency and clarity of colorless detection.

[0139] (3) Visual inspection: Observe the transparency and color of the sample directly with your eyes.

[0140] 6. Use temperature range detection:

[0141] (1) Sample selection: Select representative samples for testing.

[0142] (2) Sample cleaning: Ensure that there is no dirt, oil or any impurities on the sample surface that may affect the test.

[0143] (3) Set low temperature environment: Place the sample in a temperature box and set it to the lowest operating temperature of -40°C.

[0144] (4) Maintain low temperature: Maintain low temperature for a period of time (24 hours) to ensure the performance stability of the material under low temperature conditions.

[0145] (5) Performance test: Conduct relevant performance tests at low temperature.

[0146] (6) Record results: Record various test data at low temperature and check whether the sample meets the use requirements.

[0147] (7) Set high temperature environment: Place the sample in a temperature box and set the maximum operating temperature to 85°C.

[0148] (8) Maintain high temperature: Maintain high temperature for a period of time (24 hours) to ensure the performance stability of the material at high temperature.

[0149] (9) Performance test: Conduct relevant performance tests at high temperature.

[0150] (10) Record results: Record various test data under high temperature to ensure that the sample does not soften, melt, deform or have other problems under high temperature.

[0151] 2. Test results

[0152] The protective agent obtained in the above example was tested for appearance and performance, and the test results are shown in Table 2.

[0153] Table 2 Protective agent test results of the embodiment

[0154] Test items Test results Hardness (Shore D) ≥75 Shear strength (Fe-Fe, MPa) ＞10 Curing shrinkage (%) ＜0.8 Dielectric loss tangent (1.2Mhz, 25℃) ＜0.01 Appearance Colorless and transparent Operating temperature range -40～85℃

[0155] In summary, it can be seen from 1 that the protective agent of the present invention has excellent mechanical strength, weather resistance, low shrinkage, and high transparency. Therefore, the protective agent of the present invention has both mechanical strength and transparency, and realizes the characteristics of maintaining high transparency while protecting materials, meets the requirements of mechanical strength and visual beauty in the fields of buildings, bridges, and infrastructure, and effectively prolongs the service life of the protected objects.

[0156] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0157] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A protective agent, characterized in that The protective agent comprises component A and component B, and the component A comprises the following substances in parts by weight: The B component includes 100 parts of a modified fixing agent.

2. The protective agent according to claim 1, characterized in that The weight ratio of the component A to the component B is (1-3):

1.

3. The protective agent according to claim 1, characterized in that The epoxy resins include tetrafunctional glycidylamines.

4. The protective agent according to claim 1, characterized in that The antioxidants include benzotriazoles.

5. The protective agent according to claim 1, characterized in that The coupling agent includes at least one of 3-(trimethoxysilyl)propyl methacrylate, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, and γ-aminopropyltriethoxysilane.

6. The protective agent according to claim 1, characterized in that The toughening agent includes at least one of γ-(2,3-epoxypropyloxy)propyltrimethoxysilane, N-β-aminoethyl-γ-aminopropyltrimethoxysilane, γ-glycidyloxypropyltriethoxysilane, and 3-glycidyloxypropyltri(2-methoxyethoxy)silane.

7. The protective agent according to claim 1, characterized in that The light stabilizer includes a light stabilizer 944 and a light stabilizer 770 , and the mass ratio of the light stabilizer 944 to the light stabilizer 770 is 1:

1.

8. The protective agent according to claim 1, characterized in that The accelerator includes an organosiloxane derivative.

9. The protective agent according to claim 1, characterized in that The modified fixing agent includes a phenolic amine epoxy curing agent.

10. A method for preparing a protective agent, characterized in that: The following steps are involved: Mixing epoxy resin, antioxidant, coupling agent, toughening agent, light stabilizer and accelerator to obtain component A; Mixing component A and component B to prepare a mixture; The mixture is sprayed on the surface of the substrate and cured; Further, the component B includes a modified fixing agent; Furthermore, the spraying temperature is 20-30°C and the time is 25-35min; Further, the curing includes at least one of heating curing and room temperature curing; Furthermore, the heating curing temperature is 55-65°C and the time is 2-3h; Furthermore, the room temperature curing temperature is 20 to 30° C., and the time is 24 to 48 hours.

11. The preparation method according to claim 10, characterized in that: The A component includes the following raw materials by weight: Epoxy resin, 80-90 parts; Antioxidants, 1-2 parts; Coupling agent, 1.5-3 parts; Toughening agent, 4-6 parts; Light stabilizer, 1-2 parts; Accelerator, 0.1-1 part; The B component includes 100 parts of a modified fixing agent.

12. The preparation method according to claim 10, characterized in that: In the mixture, the weight ratio of component A to component B is (1-3):1.

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