High-strength resin

Abstract

The invention provides high-strength resin, and relates to the technical field of high polymer materials. The composite material is prepared from the following raw materials in parts by weight: 50-90 parts of matrix resin, 10-40 parts of reinforced fibers, 5-15 parts of nano filler, 5-20 parts of a curing agent, 0.5-5 parts of an accelerant, 3-10 parts of a flexibilizer and 1-5 parts of a stabilizer, the reinforcing fibers are at least one of glass fibers, carbon fibers or aramid fibers, and the nano filler is at least one of nano silicon dioxide, nano aluminum oxide or carbon nanotubes. According to the invention, the performance consistency of the resin in long-term use is ensured, the molding quality and structural integrity of the resin are improved, and the applicability and durability of the resin are enhanced.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a high-strength resin. Background Technology

[0002] Polymer materials, also known as high molecular weight polymers, are materials composed of high molecular weight compounds as the matrix and other additives.

[0003] Currently, due to various component and process limitations in the preparation of traditional resin materials, the interfacial bonding force between the reinforcing fibers and the resin matrix is ​​insufficient when strengthening the mechanical properties of high-strength resins. This makes it impossible to transfer stress. If microcracks or voids appear at the interface, stress concentration and fiber delamination will occur, resulting in unstable mechanical properties and high dispersion of the composite material, which cannot guarantee the reliability of long-term use. At the same time, during the resin curing process, the crosslinking density and network structure uniformity cannot be controlled in real time, which will lead to incomplete curing or local over-curing. Furthermore, curing defects cannot be corrected in time, affecting the overall strength and durability of the resin.

[0004] Therefore, a high-strength resin is proposed to solve the above problems. Summary of the Invention

[0005] To address the problems of insufficient interfacial bonding between reinforcing fibers and resin matrix, resulting in the inability to transfer stress, and the inability to control crosslinking density and network structure uniformity in real time, this invention provides a high-strength resin.

[0006] The technical solutions provided by the embodiments of the present invention are as follows: This invention provides a high-strength resin comprising 50-90 parts of a matrix resin, 10-40 parts of reinforcing fibers, 5-15 parts of nanofillers, 5-20 parts of a curing agent, 0.5-5 parts of an accelerator, 3-10 parts of a toughening agent, and 1-5 parts of a stabilizer. The matrix resin is at least one of epoxy resin, polyurethane resin, or vinyl ester resin; the reinforcing fibers are at least one of glass fiber, carbon fiber, or aramid fiber; the nanofillers are at least one of nano-silica, nano-alumina, or carbon nanotubes; the curing agent is at least one of amine curing agents, acid anhydride curing agents, or isocyanate curing agents; the accelerator is at least one of imidazole compounds, tertiary amine compounds, or metal carboxylates; the toughening agent is at least one of carboxyl-terminated nitrile butadiene rubber, core-shell rubber, or thermoplastic polyurethane; and the stabilizer is at least one of ultraviolet absorbers, antioxidants, or heat stabilizers.

[0007] Preferably, the matrix resin is an epoxy resin, which is selected from at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenolic epoxy resin or hydrogenated bisphenol A type epoxy resin, with an epoxy value of 0.45-0.55 eq / 100g, a molecular weight of 300-1000, and a viscosity of 500-5000 mPa·s at 25°C.

[0008] Preferably, the epoxy resin is pretreated during the preparation process, including vacuum dehydration at 60-80°C for 1-2 hours to remove moisture and volatile impurities. In addition, the epoxy resin can be partially replaced with bio-based epoxy resin, which is derived from vegetable oil or lignin and accounts for 10-30% of the total weight of the matrix resin.

[0009] Preferably, the reinforcing fiber is carbon fiber, selected from at least one of polyacrylonitrile-based carbon fiber, pitch-based carbon fiber, or recycled carbon fiber, with a single filament diameter of 5-10 μm, a length of 1-10 mm, a tensile strength of not less than 3.5 GPa, and a modulus of not less than 200 GPa. The carbon fiber undergoes surface treatment before being used in resin lamination, including plasma treatment or chemical oxidation treatment, wherein the plasma treatment is performed at a vacuum degree of 1×10⁻⁶. -1 ~1×10 -3 The process is carried out at Pa, with a power of 300-500W and a processing time of 5-15 minutes. The reinforcing fibers are arranged in a random or directional distribution, wherein the directional distribution can be achieved by electric field-assisted arrangement with an electric field strength of 1-5kV / cm.

[0010] Preferably, the nanofiller is nano-silica, wherein the nano-silica has a particle size of 10-100 nm and a specific surface area of ​​100-300 m². 2 / g, and its surface is modified with a silane coupling agent, wherein the silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane or methyltrimethoxysilane. The modification method is to disperse nano-silica in an ethanol solution, add the silane coupling agent, the amount of which is 1-5% of the weight of nano-silica, stir and react at 60-80℃ for 2-4 hours, and then wash and dry. The dispersion of the nanofiller in the resin is achieved by ultrasonic treatment, the ultrasonic power is 500-1000W, and the time is 30-60 minutes to ensure uniform distribution and avoid agglomeration.

[0011] Preferably, the curing agent is an amine curing agent, selected from at least one of aliphatic amines, aromatic amines, or polyether amines, including ethylenediamine, diethylenetriamine, m-phenylenediamine, or polyoxypropylene diamine, with an amine value of 200-500 mg KOH / g and an active hydrogen equivalent of 50-100 g / eq. The ratio of the curing agent to the matrix resin is calculated by stoichiometry, and the molar ratio of amine groups to epoxy groups is 0.8:1 to 1.2:1 to ensure curing. The curing agent is preheated before addition, liquefied at 40-60°C, and filtered to remove impurities.

[0012] Preferably, the imidazole compound is selected from at least one of 2-methylimidazole, 2-ethyl-4-methylimidazole or 1-cyanoethyl-2-methylimidazole, and its amount is 0.5-3% of the total weight of the resin. The accelerator is dissolved in a polar solvent acetone or ethanol before addition, with a concentration of 10-20%, to ensure uniform dispersion.

[0013] Preferably, the toughening agent is a core-shell rubber, which is composed of butadiene-styrene copolymer as the core and polymethyl methacrylate as the shell, with a particle size of 50-200 nm, a shell thickness of 5-20 nm, and a glass transition temperature of -50°C to -30°C for the core and 80-100°C for the shell. The toughening agent is added by pre-dispersing it in the matrix resin and then treating it with a high-speed shear emulsifier at 2000-5000 r / min for 10-30 minutes to form a stable emulsion.

[0014] Preferably, the stabilizer is an ultraviolet absorber selected from at least one of benzotriazoles, benzophenones, or triazines, specifically 2-(2-hydroxy-5-methylphenyl)benzotriazole or 2-hydroxy-4-n-octyloxybenzophenone, and its dosage is 1-3% of the total weight of the resin. The stabilizer works synergistically with the antioxidant, which is a hindered phenol or phosphite. The stabilizer is added to the resin system by melt blending and stirring at 120-150°C for 20-40 minutes to ensure uniform distribution.

[0015] Preferably, the preparation method of the high-strength resin includes the following steps: Step 1, preheating and stirring the matrix resin at 60-80℃, adding nanofillers and toughening agents, and melt-blending it for 5-10 minutes at 100-150℃ and 200-500r / min using a twin-screw extruder; Step 2, adding reinforcing fibers and stabilizers, and continuing to mix for 3-5 minutes; Step 3, adding curing agents and accelerators, and degassing under vacuum for 10-20 minutes; Step 4, injecting the mixture into a mold, curing it for 1-3 hours at a pressure of 5-15MPa and a temperature of 100-150℃, and then curing it at 120-180℃ for 2-4 hours.

[0016] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this embodiment of the invention, by optimizing the surface treatment of the reinforcing fibers and the composition of the matrix resin, a strong interfacial bond is formed between the fibers and the resin, transferring stress and reducing the generation of microcracks and voids. This improves the mechanical stability and reliability of the composite material, avoids stress concentration and fiber delamination problems caused by insufficient interfacial bonding, and ensures the consistency of resin performance during long-term use. By employing a specific curing agent and accelerator system, combined with a controllable curing process, uniform control of resin crosslinking density is achieved, avoiding incomplete or over-curing, ensuring the overall strength and durability of the resin, thus solving the problem of real-time control during the curing process and improving the molding quality and structural integrity of the resin. By introducing stabilizers and toughening agents, the resin's anti-aging and anti-fatigue properties are synergistically improved, enabling it to maintain stable performance under varying environmental conditions and extending the application life of the material in high-end fields. This solves the problem of performance degradation of traditional resins under environmental factors, achieving multi-functional synergistic improvement and enhancing the resin's applicability and durability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of a high-strength resin according to the present invention. Detailed Implementation

[0019] The technical solutions of the present invention will now be described with reference to the accompanying drawings. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies. Furthermore, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0020] Example 1: A high-strength resin, made from the following raw materials in parts by weight: 50 parts matrix resin, 10 parts reinforcing fiber, 5 parts nanofiller, 5 parts curing agent, 0.5 parts accelerator, 3 parts toughening agent, and 1 part stabilizer. The matrix resin is at least one of epoxy resin, polyurethane resin, or vinyl ester resin; the reinforcing fiber is at least one of glass fiber, carbon fiber, or aramid fiber; the nanofiller is at least one of nano-silica, nano-alumina, or carbon nanotubes; the curing agent is at least one of amine curing agents, acid anhydride curing agents, or isocyanate curing agents; the accelerator is at least one of imidazole compounds, tertiary amine compounds, or metal carboxylates; the toughening agent is at least one of carboxyl-terminated nitrile butadiene rubber, core-shell rubber, or thermoplastic polyurethane; and the stabilizer is at least one of ultraviolet absorber, antioxidant, or heat stabilizer.

[0021] The matrix resin is an epoxy resin, which is selected from at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenolic epoxy resin or hydrogenated bisphenol A type epoxy resin, with an epoxy value of 0.45 eq / 100g, a molecular weight of 300, and a viscosity of 500 mPa·s at 25°C.

[0022] The epoxy resin undergoes pretreatment during preparation, including vacuum dehydration at 60°C for 1 hour to remove moisture and volatile impurities. In addition, the epoxy resin can be partially replaced with bio-based epoxy resin, which is derived from vegetable oil or lignin and accounts for 10% of the total weight of the matrix resin.

[0023] The reinforcing fiber is carbon fiber, selected from at least one of polyacrylonitrile-based carbon fiber, pitch-based carbon fiber, or recycled carbon fiber. Its monofilament diameter is 5 μm, length is 1 mm, tensile strength is not less than 3.5 GPa, and modulus is not less than 200 GPa. The carbon fiber undergoes surface treatment before being used in resin lamination, including plasma treatment or chemical oxidation treatment. The plasma treatment is performed at a vacuum degree of 1×10⁻⁶. -1 The process is carried out at Pa, with a power of 300W and a processing time of 5 minutes. The reinforcing fibers are arranged in a random or directional distribution. The directional distribution can be achieved by electric field-assisted arrangement with an electric field strength of 1kV / cm.

[0024] The nanofiller is nano-silica, with a particle size of 10 nm and a specific surface area of ​​100 m². 2 / g, and its surface is modified with a silane coupling agent. The silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane or methyltrimethoxysilane. The modification method is to disperse nano-silica in an ethanol solution, add the silane coupling agent at 1% of the weight of nano-silica, stir and react at 60°C for 2 hours, and then wash and dry. The dispersion of nanofiller in resin is achieved by ultrasonic treatment with an ultrasonic power of 500W for 30 minutes to ensure uniform distribution and avoid agglomeration.

[0025] The curing agent is an amine-based curing agent, selected from at least one of aliphatic amines, aromatic amines, or polyether amines, including ethylenediamine, diethylenetriamine, m-phenylenediamine, or polyoxypropylene diamine. Its amine value is 200 mg KOH / g, and its active hydrogen equivalent is 50 g / eq. The ratio of the curing agent to the matrix resin is calculated by stoichiometry, and the molar ratio of amine groups to epoxy groups is 0.8:1 to ensure curing. The curing agent is preheated before being added, liquefied at 40°C, and filtered to remove impurities.

[0026] The imidazole compound is selected from at least one of 2-methylimidazole, 2-ethyl-4-methylimidazole or 1-cyanoethyl-2-methylimidazole, and its amount is 0.5% of the total weight of the resin. The accelerator is dissolved in the polar solvent acetone or ethanol at a concentration of 10% before addition to ensure uniform dispersion.

[0027] The toughening agent is a core-shell rubber, which is composed of butadiene-styrene copolymer as the core and polymethyl methacrylate as the shell. Its particle size is 50 nm, the shell thickness is 5 nm, and the glass transition temperature is -50℃ for the core and 80℃ for the shell. The toughening agent is added by pre-dispersing it in the matrix resin and then treating it for 10 minutes at 2000 r / min using a high-speed shear emulsifier to form a stable emulsion.

[0028] The stabilizer is a UV absorber, which is selected from at least one of benzotriazole, benzophenone or triazine, specifically 2-(2-hydroxy-5-methylphenyl)benzotriazole or 2-hydroxy-4-n-octyloxybenzophenone, and its amount is 1% of the total weight of the resin. The stabilizer and antioxidant work synergistically. The antioxidant is a hindered phenol or phosphite. The stabilizer is added to the resin system by melt blending and stirring at 120°C for 20 minutes to ensure uniform distribution.

[0029] The preparation method of high-strength resin includes the following steps: Step 1, preheat and stir the matrix resin at 60°C, add nanofillers and toughening agents, and melt-blend for 5 minutes at 100°C and 200 r / min using a twin-screw extruder; Step 2, add reinforcing fibers and stabilizers, and continue mixing for 3 minutes; Step 3, add curing agents and accelerators, and degas for 10 minutes under vacuum conditions; Step 4, inject the mixture into a mold, cure for 1 hour at a pressure of 5 MPa and a temperature of 100°C, and then cure at 120°C for 2 hours.

[0030] Example 2: A high-strength resin, made from the following raw materials in parts by weight: 70 parts matrix resin, 25 parts reinforcing fiber, 10 parts nanofiller, 12.5 parts curing agent, 2.75 parts accelerator, 6.5 parts toughening agent, and 3 parts stabilizer. The matrix resin is at least one of epoxy resin, polyurethane resin, or vinyl ester resin; the reinforcing fiber is at least one of glass fiber, carbon fiber, or aramid fiber; the nanofiller is at least one of nano-silica, nano-alumina, or carbon nanotubes; the curing agent is at least one of amine curing agents, acid anhydride curing agents, or isocyanate curing agents; the accelerator is at least one of imidazole compounds, tertiary amine compounds, or metal carboxylates; the toughening agent is at least one of carboxyl-terminated nitrile butadiene rubber, core-shell rubber, or thermoplastic polyurethane; and the stabilizer is at least one of ultraviolet absorber, antioxidant, or heat stabilizer.

[0031] The matrix resin is an epoxy resin, which is selected from at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenolic epoxy resin or hydrogenated bisphenol A type epoxy resin, with an epoxy value of 0.50 eq / 100g, a molecular weight of 650, and a viscosity of 2750 mPa·s at 25°C.

[0032] The epoxy resin undergoes pretreatment during preparation, including vacuum dehydration at 70°C for 1.5 hours to remove moisture and volatile impurities. In addition, the epoxy resin can be partially replaced with bio-based epoxy resin, which is derived from vegetable oil or lignin and accounts for 20% of the total weight of the matrix resin.

[0033] The reinforcing fiber is carbon fiber, selected from at least one of polyacrylonitrile-based carbon fiber, pitch-based carbon fiber, or recycled carbon fiber. Its monofilament diameter is 7.5 μm, its length is 5.5 mm, its tensile strength is not less than 3.5 GPa, and its modulus is not less than 200 GPa. The carbon fiber undergoes surface treatment before being used in resin lamination, including plasma treatment or chemical oxidation treatment. The plasma treatment is performed at a vacuum degree of 5.05 × 10⁻⁶. -2 The process is carried out at Pa, with a power of 400W and a processing time of 10 minutes. The reinforcing fibers are arranged in a random or directional distribution. The directional distribution can be achieved by electric field-assisted arrangement with an electric field strength of 3kV / cm.

[0034] The nanofiller is nano-silica with a particle size of 55 nm and a specific surface area of ​​200 m². 2 / g, and its surface is modified with a silane coupling agent. The silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane or methyltrimethoxysilane. The modification method is to disperse nano-silica in an ethanol solution, add the silane coupling agent at 3% of the weight of nano-silica, stir and react at 70°C for 3 hours, and then wash and dry. The dispersion of nanofiller in resin is achieved by ultrasonic treatment with an ultrasonic power of 750W for 45 minutes to ensure uniform distribution and avoid agglomeration.

[0035] The curing agent is an amine-based curing agent, selected from at least one of aliphatic amines, aromatic amines, or polyether amines, including ethylenediamine, diethylenetriamine, m-phenylenediamine, or polyoxypropylene diamine. Its amine value is 350 mg KOH / g, and its active hydrogen equivalent is 75 g / eq. The ratio of the curing agent to the matrix resin is calculated by stoichiometry, and the molar ratio of amine groups to epoxy groups is 1.0:1 to ensure curing. The curing agent is preheated before addition, liquefied at 50°C, and filtered to remove impurities.

[0036] The imidazole compound is selected from at least one of 2-methylimidazole, 2-ethyl-4-methylimidazole or 1-cyanoethyl-2-methylimidazole, and its amount is 1.75% of the total weight of the resin. The accelerator is dissolved in the polar solvent acetone or ethanol at a concentration of 15% before addition to ensure uniform dispersion.

[0037] The toughening agent is a core-shell rubber, which is composed of butadiene-styrene copolymer as the core and polymethyl methacrylate as the shell. Its particle size is 125 nm, the shell thickness is 12.5 nm, and the glass transition temperature is -40℃ for the core and 90℃ for the shell. The toughening agent is added by pre-dispersing it in the matrix resin and then treating it for 20 minutes at 3500 r / min using a high-speed shear emulsifier to form a stable emulsion.

[0038] The stabilizer is a UV absorber, which is selected from at least one of benzotriazole, benzophenone or triazine, specifically 2-(2-hydroxy-5-methylphenyl)benzotriazole or 2-hydroxy-4-n-octyloxybenzophenone, and its amount is 2% of the total weight of the resin. The stabilizer and antioxidant work synergistically. The antioxidant is a hindered phenol or phosphite. The stabilizer is added to the resin system by melt blending and stirring at 135°C for 30 minutes to ensure uniform distribution.

[0039] The preparation method of high-strength resin includes the following steps: Step 1, preheat and stir the matrix resin at 70°C, add nanofillers and toughening agents, and melt-blend for 7.5 minutes at 125°C and 350 r / min using a twin-screw extruder; Step 2, add reinforcing fibers and stabilizers, and continue mixing for 4 minutes; Step 3, add curing agents and accelerators, and degas under vacuum for 15 minutes; Step 4, inject the mixture into a mold, and cure for 2 hours at a pressure of 10 MPa and a temperature of 125°C, followed by curing at 150°C for 3 hours.

[0040] Example 3: A high-strength resin, made from the following raw materials in parts by weight: 90 parts matrix resin, 40 parts reinforcing fiber, 15 parts nanofiller, 20 parts curing agent, 5 parts accelerator, 10 parts toughening agent, and 5 parts stabilizer. The matrix resin is at least one of epoxy resin, polyurethane resin, or vinyl ester resin; the reinforcing fiber is at least one of glass fiber, carbon fiber, or aramid fiber; the nanofiller is at least one of nano-silica, nano-alumina, or carbon nanotubes; the curing agent is at least one of amine curing agents, acid anhydride curing agents, or isocyanate curing agents; the accelerator is at least one of imidazole compounds, tertiary amine compounds, or metal carboxylates; the toughening agent is at least one of carboxyl-terminated nitrile butadiene rubber, core-shell rubber, or thermoplastic polyurethane; and the stabilizer is at least one of ultraviolet absorber, antioxidant, or heat stabilizer.

[0041] The matrix resin is an epoxy resin, which is selected from at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenolic epoxy resin or hydrogenated bisphenol A type epoxy resin, with an epoxy value of 0.55 eq / 100g, a molecular weight of 1000, and a viscosity of 5000 mPa·s at 25°C.

[0042] The epoxy resin undergoes pretreatment during preparation, including vacuum dehydration at 80°C for 2 hours to remove moisture and volatile impurities. In addition, the epoxy resin can be partially replaced with bio-based epoxy resin, which is derived from vegetable oil or lignin and accounts for 30% of the total weight of the matrix resin.

[0043] The reinforcing fiber is carbon fiber, selected from at least one of polyacrylonitrile-based carbon fiber, pitch-based carbon fiber, or recycled carbon fiber. Its single filament diameter is 10 μm, length is 10 mm, tensile strength is not less than 3.5 GPa, and modulus is not less than 200 GPa. The carbon fiber undergoes surface treatment before being used in resin lamination, including plasma treatment or chemical oxidation treatment. The plasma treatment is performed at a vacuum degree of 1×10⁻⁶. -3 The process is carried out at Pa, with a power of 500W and a processing time of 15 minutes. The reinforcing fibers are arranged in a random or directional distribution. The directional distribution can be achieved by electric field-assisted arrangement with an electric field strength of 5kV / cm.

[0044] The nanofiller is nano-silica, with a particle size of 100 nm and a specific surface area of ​​300 m². 2 / g, and its surface is modified with a silane coupling agent. The silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane or methyltrimethoxysilane. The modification method is to disperse nano-silica in an ethanol solution, add the silane coupling agent at 5% of the weight of nano-silica, stir and react at 80°C for 4 hours, and then wash and dry. The dispersion of nanofiller in resin is achieved by ultrasonic treatment with an ultrasonic power of 1000W for 60 minutes to ensure uniform distribution and avoid agglomeration.

[0045] The curing agent is an amine-based curing agent, selected from at least one of aliphatic amines, aromatic amines, or polyether amines, including ethylenediamine, diethylenetriamine, m-phenylenediamine, or polyoxypropylene diamine. Its amine value is 500 mg KOH / g, and its active hydrogen equivalent is 100 g / eq. The ratio of the curing agent to the matrix resin is calculated by stoichiometry, and the molar ratio of amine groups to epoxy groups is 1.2:1 to ensure curing. The curing agent is preheated before addition, liquefied at 60°C, and filtered to remove impurities.

[0046] The imidazole compound is selected from at least one of 2-methylimidazole, 2-ethyl-4-methylimidazole or 1-cyanoethyl-2-methylimidazole, and its amount is 3% of the total weight of the resin. The accelerator is dissolved in the polar solvent acetone or ethanol at a concentration of 20% before addition to ensure uniform dispersion.

[0047] The toughening agent is a core-shell rubber, which is composed of butadiene-styrene copolymer as the core and polymethyl methacrylate as the shell. Its particle size is 200 nm, the shell thickness is 20 nm, and the glass transition temperature is -30℃ for the core and 100℃ for the shell. The toughening agent is added by pre-dispersing it in the matrix resin and then treating it for 30 minutes at 5000 r / min using a high-speed shear emulsifier to form a stable emulsion.

[0048] The stabilizer is a UV absorber, which is selected from at least one of benzotriazole, benzophenone or triazine, specifically 2-(2-hydroxy-5-methylphenyl)benzotriazole or 2-hydroxy-4-n-octyloxybenzophenone, and its amount is 3% of the total weight of the resin. The stabilizer and antioxidant work synergistically. The antioxidant is a hindered phenol or phosphite. The stabilizer is added to the resin system by melt blending and stirring at 150°C for 40 minutes to ensure uniform distribution.

[0049] The preparation method of high-strength resin includes the following steps: Step 1, preheat and stir the matrix resin at 80°C, add nanofillers and toughening agents, and melt-blend for 10 minutes at 150°C and 500 r / min using a twin-screw extruder; Step 2, add reinforcing fibers and stabilizers, and continue mixing for 5 minutes; Step 3, add curing agents and accelerators, and degas under vacuum for 20 minutes; Step 4, inject the mixture into a mold, and cure for 3 hours at a pressure of 15 MPa and a temperature of 150°C, followed by curing at 180°C for 4 hours.

[0050] Comparative Example 1: The difference between this comparative example and Example 1 is that no functional additives were added when preparing the impregnation solution in this comparative example.

[0051] Comparative Example 2 differs from Example 2 in that the reinforcing fibers were not subjected to plasma surface pretreatment during the composite process in this comparative example.

[0052] Comparative Example 3 differs from Example 3 in that no toughening agent was added to the resin system in this comparative example.

[0053] Comparative Example 4 differs from Example 3 in that no accelerator was used in the curing stage of this comparative example. The performance of one of the high-strength resins in Examples 1-3 and Comparative Examples 1-4 was tested. The test items and test methods are as follows: Tensile strength test: The maximum tensile stress after the resin has cured is determined using a universal testing machine.

[0054] Impact strength test: The energy absorbed when the resin sample breaks is measured using a cantilever beam impact testing machine.

[0055] Heat distortion temperature test: The temperature at which the resin reaches a specified deformation under a specific load is determined to evaluate its heat resistance.

[0056] Interfacial bonding strength test: The fracture morphology of the resin was observed by scanning electron microscopy to analyze the interfacial bonding between the reinforcing fiber and the resin matrix.

[0057] The test data of one of the high-strength resins in Examples 1-3 and Comparative Examples 1-4 are recorded in the table below: By comparing and analyzing the data in the table, it can be seen that the high-strength resin in Examples 1-3 has superior performance compared to the high-strength resin in Comparative Examples 1-4. This indicates that by optimizing the surface treatment of the reinforcing fibers and the composition of the matrix resin, a strong interfacial bond is formed between the fibers and the resin, stress is transferred, and the generation of microcracks and voids is reduced, thereby improving the mechanical stability and reliability of the composite material. This avoids stress concentration and fiber delamination problems caused by insufficient interfacial bonding, ensuring the consistency of resin performance during long-term use. By using a specific curing agent and accelerator system, combined with a controllable curing process, the resin crosslinking density can be uniformly controlled, avoiding incomplete or over-curing, ensuring the overall strength and durability of the resin, thus solving the problem of not being able to control the curing process in real time, improving the molding quality and structural integrity of the resin. By introducing stabilizers and toughening agents, the resin's anti-aging and anti-fatigue properties are synergistically improved, enabling it to maintain stable performance under varying environmental conditions, extending the application life of the material in high-end fields, thereby solving the problem of performance degradation of traditional resins under environmental factors, achieving multi-functional synergistic improvement, and enhancing the applicability and durability of the resin.

[0058] By comparing and analyzing the relevant data in the table, it can be seen that the high-strength resin of the present invention has superior comprehensive performance.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-strength resin, characterized in that, It is made from the following raw materials in parts by weight: 50-90 parts of matrix resin, 10-40 parts of reinforcing fiber, 5-15 parts of nanofiller, 5-20 parts of curing agent, 0.5-5 parts of accelerator, 3-10 parts of toughening agent, and 1-5 parts of stabilizer. The matrix resin is at least one of epoxy resin, polyurethane resin, or vinyl ester resin; the reinforcing fiber is at least one of glass fiber, carbon fiber, or aramid fiber; the nanofiller is at least one of nano-silica, nano-alumina, or carbon nanotubes; the curing agent is at least one of amine curing agent, acid anhydride curing agent, or isocyanate curing agent; the accelerator is at least one of imidazole compound, tertiary amine compound, or metal carboxylate; the toughening agent is at least one of carboxyl-terminated nitrile butadiene rubber, core-shell rubber, or thermoplastic polyurethane; and the stabilizer is at least one of ultraviolet absorber, antioxidant, or heat stabilizer.

2. The high-strength resin according to claim 1, characterized in that, The matrix resin is an epoxy resin, which is selected from at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenolic epoxy resin or hydrogenated bisphenol A type epoxy resin, with an epoxy value of 0.45-0.55 eq / 100g, a molecular weight of 300-1000, and a viscosity of 500-5000 mPa·s at 25°C.

3. The high-strength resin according to claim 2, characterized in that, The epoxy resin undergoes pretreatment during preparation, including vacuum dehydration at 60-80°C for 1-2 hours to remove moisture and volatile impurities. In addition, the epoxy resin can be partially replaced with bio-based epoxy resin, which is derived from vegetable oil or lignin and accounts for 10-30% of the total weight of the matrix resin.

4. The high-strength resin according to claim 1, characterized in that, The reinforcing fiber is carbon fiber, selected from at least one of polyacrylonitrile-based carbon fiber, pitch-based carbon fiber, or recycled carbon fiber. Its monofilament diameter is 5-10 μm, length is 1-10 mm, tensile strength is not less than 3.5 GPa, and modulus is not less than 200 GPa. The carbon fiber undergoes surface treatment before being used in resin lamination, including plasma treatment or chemical oxidation treatment. The plasma treatment is performed at a vacuum degree of 1×10⁻⁶. -1 ~1×10 -3 The process is carried out at Pa, with a power of 300-500W and a processing time of 5-15 minutes. The reinforcing fibers are arranged in a random or directional distribution, wherein the directional distribution can be achieved by electric field-assisted arrangement with an electric field strength of 1-5kV / cm.

5. The high-strength resin according to claim 1, characterized in that, The nanofiller is nano-silica, with a particle size of 10-100 nm and a specific surface area of ​​100-300 m². 2 / g, and its surface is modified with a silane coupling agent, wherein the silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane or methyltrimethoxysilane. The modification method is to disperse nano-silica in an ethanol solution, add the silane coupling agent, the amount of which is 1-5% of the weight of nano-silica, stir and react at 60-80℃ for 2-4 hours, and then wash and dry. The dispersion of the nanofiller in the resin is achieved by ultrasonic treatment, the ultrasonic power is 500-1000W, and the time is 30-60 minutes to ensure uniform distribution and avoid agglomeration.

6. The high-strength resin according to claim 1, characterized in that, The curing agent is an amine curing agent, selected from at least one of aliphatic amines, aromatic amines, or polyether amines, including ethylenediamine, diethylenetriamine, m-phenylenediamine, or polyoxypropylene diamine, with an amine value of 200-500 mgKOH / g and an active hydrogen equivalent of 50-100 g / eq. The ratio of the curing agent to the matrix resin is calculated by stoichiometry, and the molar ratio of amine groups to epoxy groups is 0.8:1 to 1.2:1 to ensure curing. The curing agent is preheated before addition, liquefied at 40-60°C, and filtered to remove impurities.

7. The high-strength resin according to claim 1, characterized in that, The imidazole compound is selected from at least one of 2-methylimidazole, 2-ethyl-4-methylimidazole or 1-cyanoethyl-2-methylimidazole, and its amount is 0.5-3% of the total weight of the resin. The accelerator is dissolved in a polar solvent acetone or ethanol before addition, with a concentration of 10-20%, to ensure uniform dispersion.

8. The high-strength resin according to claim 1, characterized in that, The toughening agent is a core-shell rubber, which is composed of butadiene-styrene copolymer as the core and polymethyl methacrylate as the shell. Its particle size is 50-200 nm, the shell thickness is 5-20 nm, and the glass transition temperature is -50℃ to -30℃ for the core and 80-100℃ for the shell. The toughening agent is added by pre-dispersing it in the matrix resin and then treating it with a high-speed shear emulsifier at 2000-5000 r / min for 10-30 minutes to form a stable emulsion.

9. The high-strength resin according to claim 1, characterized in that, The stabilizer is a UV absorber, which is selected from at least one of benzotriazoles, benzophenones, or triazines, specifically 2-(2-hydroxy-5-methylphenyl)benzotriazole or 2-hydroxy-4-n-octyloxybenzophenone, and its amount is 1-3% of the total weight of the resin. The stabilizer works synergistically with the antioxidant, which is a hindered phenol or phosphite. The stabilizer is added to the resin system by melt blending and stirring at 120-150°C for 20-40 minutes to ensure uniform distribution.

10. The high-strength resin according to claim 1, characterized in that, The preparation method of the high-strength resin includes the following steps: Step 1, preheating and stirring the matrix resin at 60-80℃, adding nanofillers and toughening agents, and melt-blending at 100-150℃ and 200-500r / min using a twin-screw extruder for 5-10 minutes; Step 2, adding reinforcing fibers and stabilizers, and continuing to mix for 3-5 minutes; Step 3, adding curing agents and accelerators, and degassing under vacuum for 10-20 minutes; Step 4, injecting the mixture into a mold, curing at a pressure of 5-15MPa and a temperature of 100-150℃ for 1-3 hours, and then curing at 120-180℃ for 2-4 hours.

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