Preparation method of impregnating compound for glass fiber surface

Abstract

The invention discloses a preparation method of an impregnating compound for a glass fiber surface, and relates to the technical field of chemical engineering. Comprising 10 to 720 parts of an epoxy resin emulsion, 10 to 550 parts of a polyurethane emulsion, 1 to 210 parts of a coupling agent, 2 to 200 parts of a lubricant, 10 to 150 parts of a surfactant, 5 to 500 parts of silicon dioxide nanoparticles, 1 to 120 parts of starch, 1 to 210 parts of an anti-hydrolysis agent, 2 to 500 parts of quaternary ammonium salt, 10 to 200 parts of carbon nanotubes and 100 to 1000 parts of deionized water. S2, the silicon dioxide nanoparticles and the carbon nanotubes are added into deionized water, a surfactant is added, and dispersion treatment is conducted through high-speed shearing. By adding the silicon dioxide nanoparticles, the carbon nanotubes and the quaternary ammonium salt, the glass fiber is endowed with special conductive and antibacterial functions, special requirements in multiple fields are met, and the lubricant and the surfactant reduce fiber friction and improve bundling property and processing efficiency; the protective film formed by the coupling agent enhances the interface bonding force between the fiber and the matrix resin, and improves the mechanical properties and durability of the composite material.

Description

Technical Field

[0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing a wetting agent for the surface of glass fiber. Background Art

[0002] As an inorganic non-metallic material with excellent performance, glass fiber has a series of excellent properties such as high strength, high modulus, high temperature resistance, corrosion resistance, and electrical insulation. It has been widely used in many fields such as aerospace, automobile manufacturing, construction engineering, electronic appliances, wind power generation, etc. In the field of aerospace, glass fiber reinforced composite materials are used to manufacture aircraft wings and fuselage structural components, which can effectively reduce the weight of aircraft and improve fuel efficiency; in the field of wind power generation, glass fiber reinforced plastics are widely used in the manufacture of wind turbine blades to meet their requirements for high strength and lightness; the impregnating agent plays a vital role in the production and application of glass fiber. It can reduce the friction coefficient between glass fiber filaments, reduce the generation of hair and broken ends, improve the bundling and processing performance of glass fiber, and facilitate the subsequent weaving, winding, and pultrusion processing. At the same time, the impregnating agent can also form a protective film on the surface of the glass fiber to enhance the interfacial bonding between the glass fiber and the matrix resin, thereby improving the mechanical properties and durability of the composite material; Most of the impregnants in the existing technology can only meet the basic processing and use requirements of glass fibers, and their functions are relatively single. With the continuous improvement of the performance requirements of various industries for glass fibers and their composite materials, such as requiring glass fibers to have special functions such as flame retardancy, conductivity, and antibacterial, the existing impregnants are difficult to meet these diverse needs. In this regard, we propose a method for preparing an impregnant for the surface of glass fibers. Summary of the invention

[0003] In order to solve the above technical problems, a method for preparing a wetting agent for the surface of glass fiber is provided. This technical solution solves the above problems.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a method for preparing a sizing agent for the surface of glass fiber, the preparation steps are: S1. Prepare materials, including 10-720 parts of epoxy resin emulsion, 10-550 parts of polyurethane emulsion, 1-210 parts of coupling agent, 2-200 parts of lubricant, 10-150 parts of surfactant, 5-500 parts of silica nanoparticles, 1-120 parts of starch, 1-210 parts of anti-hydrolysis agent, 2-500 parts of quaternary ammonium salt, 10-200 parts of carbon nanotubes and 100-1000 parts of deionized water; S2, adding silica nanoparticles and carbon nanotubes to deionized water respectively, adding a surfactant, and dispersing by high-speed shearing to prepare a dispersion; dissolving starch with warm water, mixing the coupling agent with deionized water, adjusting the pH to 3-4, stirring until the solution is clear, completing hydrolysis activation, and adding the dissolved starch to the hydrolysis solution to form a hydrolyzate; S3, diluting the epoxy resin emulsion and deionized water in a ratio of 1:3, stirring, stirring for 30 minutes, adding the polyurethane emulsion, and continuously stirring and mixing to form a mixed solution; S4, adding the treated dispersion, hydrolyzate and mixed solution into a reactor for mixing, continuously stirring, adding lubricant, surfactant, anti-hydrolysis agent and quaternary ammonium salt for stirring during the stirring process, waiting for the reaction stirring to be completed, and forming a wetting agent; S5, filtering the stirred infiltrate to remove impurities and particles therein; S6. The impregnating agent is uniformly applied to the surface of the glass fiber by spraying, and is heat-cured. The filtered impregnating agent and the sprayed glass fiber are quality-tested respectively. If qualified, they are packaged. If unqualified, they are re-prepared.

[0005] Preferably, the specific amounts of materials in step S1 are: 420 parts of epoxy resin emulsion, 400 parts of polyurethane emulsion, 30 parts of coupling agent, 20 parts of lubricant, 30 parts of surfactant, 320 parts of silica nanoparticles, 90 parts of starch, 50 parts of anti-hydrolysis agent, 100 parts of quaternary ammonium salt, 110 parts of carbon nanotubes and 900 parts of deionized water.

[0006] Preferably, the epoxy resin emulsion in step S1 is one of anionic epoxy resin emulsion, cationic epoxy resin emulsion and nonionic epoxy resin emulsion. The epoxy resin emulsion is prepared by grinding the epoxy resin into a micron-sized epoxy resin, adding an emulsifier for emulsification, and performing emulsification treatment by a phase inversion method.

[0007] Preferably, in step S1, the polyurethane emulsion is one of a linear polyurethane emulsion and a cross-linked polyurethane emulsion; the coupling agent is one of a silane coupling agent, a titanate coupling agent and an aluminate coupling agent; the lubricant is one of a mineral lubricant, a plant lubricant, an animal lubricant and a synthetic lubricant; and the surfactant is one of an anionic surfactant, a cationic surfactant and a nonionic surfactant.

[0008] Preferably, in step S1, the silica nanoparticles are one of amorphous silica nanoparticles, mesoporous silica nanoparticles and crystalline silica nanoparticles; the anti-hydrolysis agent is one of carbodiimides, oxazolines and epoxy compounds; and the carbon nanotubes are multi-walled carbon nanotubes.

[0009] Preferably, in step S2, the rotation speed during the high-speed shearing process is 8000-12000 r / min, the shearing time is 10-20 min, and the temperature is controlled at 20-35° C.; the pH adjustment method is to mix and stir the coupling agent and water, insert a calibrated pH meter into the solution, observe the pH meter reading, dropwise add olefin salt, and adjust to 3-4. If the pH value is adjusted too low, dilute sodium hydroxide is used to adjust the pH value.

[0010] Preferably, the stirring method in step S3 is to stir by a high-speed disperser. After the materials are added to the stirring container, they are first stirred at a low speed. After the materials are driven, the speed is increased to 1000-3000r / min and stirred for 20-40min.

[0011] Preferably, the stirring time in step S4 is 2 hours. After stirring for 40 minutes, a lubricant, a surfactant, an anti-hydrolysis agent and a quaternary ammonium salt are added to the reaction kettle and stirred for 2 hours.

[0012] Preferably, the filtering method in step S5 is performed by using a bag filter, by selecting a filter bag of a certain specification and installing it in the bag filter, and the wetting agent is transported to the bag filter through a pipeline, and the wetting agent flows from the inside of the filter bag to the outside, and impurities are trapped in the filter bag to complete the filtration.

[0013] Preferably, the quality inspection in step S6 includes inspection of appearance, solid content, viscosity and fiber mechanical properties.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention adds silicon dioxide nanoparticles, carbon nanotubes, and quaternary ammonium salts to give glass fibers special functions of conductivity and antibacterial properties to meet special needs in multiple fields. Lubricants and surfactants reduce fiber friction, improve bundling and processing efficiency; the protective film formed by the coupling agent enhances the interfacial bonding between the fiber and the matrix resin, thereby improving the mechanical properties and durability of the composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a flow chart of the steps for preparing the wetting agent. DETAILED DESCRIPTION

[0016] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0017] Reference Figure 1 As shown, a method for preparing a sizing agent for the surface of glass fiber, the preparation steps are: S1. Prepare materials, including 10-720 parts of epoxy resin emulsion, 10-550 parts of polyurethane emulsion, 1-210 parts of coupling agent, 2-200 parts of lubricant, 10-150 parts of surfactant, 5-500 parts of silica nanoparticles, 1-120 parts of starch, 1-210 parts of anti-hydrolysis agent, 2-500 parts of quaternary ammonium salt, 10-200 parts of carbon nanotubes and 100-1000 parts of deionized water; S2, adding silica nanoparticles and carbon nanotubes to deionized water respectively, adding a surfactant, and dispersing by high-speed shearing to prepare a dispersion; dissolving starch with warm water, mixing the coupling agent with deionized water, adjusting the pH to 3-4, stirring until the solution is clear, completing hydrolysis activation, and adding the dissolved starch to the hydrolysis solution to form a hydrolyzate; S3, diluting the epoxy resin emulsion and deionized water in a ratio of 1:3, stirring, stirring for 30 minutes, adding the polyurethane emulsion, and continuously stirring and mixing to form a mixed solution; S4, adding the treated dispersion, hydrolyzate and mixed solution into a reactor for mixing, continuously stirring, adding lubricant, surfactant, anti-hydrolysis agent and quaternary ammonium salt for stirring during the stirring process, waiting for the reaction stirring to be completed, and forming a wetting agent; S5, filtering the stirred infiltrate to remove impurities and particles therein; S6. The impregnating agent is uniformly applied to the surface of the glass fiber by spraying, and is heat-cured. The filtered impregnating agent and the sprayed glass fiber are quality-tested respectively. If qualified, they are packaged. If unqualified, they are re-prepared.

[0018] In step S1 of the present application, a wide dosage range is set for each raw material, and the ratio can be flexibly adjusted according to different application scenarios and performance requirements. Increasing the dosage of carbon nanotubes and silica nanoparticles can improve the conductive properties of glass fibers; increasing the proportion of quaternary ammonium salts can enhance the antibacterial function, so that the impregnating agent meets the requirements of multiple fields for special properties of glass fibers. In step S2, the silica nanoparticles and carbon nanotubes are subjected to high-speed shear dispersion to ensure that they are evenly distributed in the system and give full play to their performance. The coupling agent is combined with starch after hydrolysis and activation, which can better enhance the interfacial bonding force between glass fibers and matrix resins and improve the mechanical properties of composite materials. Steps S3 and S4 ensure full contact and reaction of the raw materials by diluting and mixing the components in steps, making the performance of the impregnating agent more uniform and stable, and avoiding the influence of local uneven components on the use effect. The filtration treatment in step S5 can effectively remove impurities and particles in the impregnating agent to prevent them from affecting the coating effect on the surface of the glass fiber and the quality of the composite material, thereby improving the reliability of the product. Step S6 performs quality inspection on the impregnating agent and the coated glass fiber, promptly discovers and handles unqualified products, ensures the quality of the final product, and enhances market competitiveness.

[0019] The specific amounts of materials in step S1 are: 420 parts of epoxy resin emulsion, 400 parts of polyurethane emulsion, 30 parts of coupling agent, 20 parts of lubricant, 30 parts of surfactant, 320 parts of silica nanoparticles, 90 parts of starch, 50 parts of anti-hydrolysis agent, 100 parts of quaternary ammonium salt, 110 parts of carbon nanotubes and 900 parts of deionized water.

[0020] The epoxy resin emulsion of the present invention has high cohesion and bonding strength, and can form a tough protective film on the surface of the glass fiber; the polyurethane emulsion gives the film layer good flexibility and elasticity. The combination of the two can enable the sizing agent to form a film with excellent comprehensive performance on the surface of the glass fiber, enhance the bonding force between the fibers, improve the bundling of the glass fiber, reduce the phenomenon of hair and broken ends, and improve the processing performance; Starch can be used as a film-forming aid. It can interact with epoxy resin emulsion and polyurethane emulsion to improve the structure and performance of the film, further improve the uniformity and density of the film, and enhance the protection of glass fiber. Silica nanoparticles can improve the hardness, wear resistance and chemical stability of glass fibers; carbon nanotubes can give glass fibers certain electrical and thermal conductivity.

[0021] The epoxy resin emulsion in step S1 is one of anionic epoxy resin emulsion, cationic epoxy resin emulsion and nonionic epoxy resin emulsion. The epoxy resin emulsion is prepared by grinding the epoxy resin into a micron-sized epoxy resin, adding an emulsifier for emulsification, and using a phase inversion method for emulsification.

[0022] In step S1, the polyurethane emulsion is one of a linear polyurethane emulsion and a cross-linked polyurethane emulsion; the coupling agent is one of a silane coupling agent, a titanate coupling agent and an aluminate coupling agent; the lubricant is one of a mineral lubricant, a plant lubricant, an animal lubricant and a synthetic lubricant; and the surfactant is one of an anionic surfactant, a cationic surfactant and a nonionic surfactant.

[0023] In step S1, the silica nanoparticles are one of amorphous silica nanoparticles, mesoporous silica nanoparticles and crystalline silica nanoparticles; the anti-hydrolysis agent is one of carbodiimides, oxazolines and epoxy compounds; and the carbon nanotubes are multi-walled carbon nanotubes.

[0024] In step S2, the rotation speed during the high-speed shearing process is 8000-12000r / min, the shearing time is 10-20min, and the temperature is controlled at 20-35°C; the pH adjustment method is to mix and stir the coupling agent and water, insert a calibrated pH meter into the solution, observe the pH meter reading, add olefin salt dropwise, and adjust to 3-4. If the pH value is adjusted too low, dilute sodium hydroxide is used to adjust the pH value to complete the adjustment.

[0025] The settings of high-speed shearing and pH adjustment in step S2 of the present application have many advantages. In terms of high-speed shearing, a rotation speed of 8000-12000r / min can generate sufficient shear force to break up the silica nanoparticles and carbon nanotube agglomerates and achieve full dispersion. A shearing time of 10-20min ensures that the particles have sufficient time to disperse evenly, avoiding problems such as incomplete dispersion or excessive energy consumption. The temperature is controlled at 20-35°C, which can maintain the stability of the dispersed system and prevent changes in the properties of the components. In terms of pH adjustment, the pH of the coupling agent hydrolysis solution can be accurately adjusted to 3-4 by calibrating the pH meter, observing the readings and adding dilute acid salts, which is beneficial to the hydrolysis and activation of the coupling agent and enhances the interfacial bonding force. At the same time, when the pH is adjusted too low, it can be adjusted back with dilute sodium hydroxide. This flexible mechanism ensures that even if the adjustment is wrong, it can be corrected in time to ensure that the pH value is appropriate, maintain the normal hydrolysis reaction of the coupling agent and the overall performance of the wetting agent is stable.

[0026] In step S3, the stirring method is to stir by a high-speed disperser. After adding the materials into the stirring container, stir at a low speed first. After the materials are driven, increase the speed to 1000-3000r / min and stir for 20-40min.

[0027] The stirring time in step S4 is 2 hours. After stirring for 40 minutes, a lubricant, a surfactant, an anti-hydrolysis agent and a quaternary ammonium salt are added to the reaction kettle and stirred for 2 hours.

[0028] The stirring and adding methods of steps S3 and S4 of the present application have significant benefits for the preparation of the impregnant. S3 first uses low-speed stirring to prevent material splashing and agglomeration, and then speeds up to 1000-3000r / min and stirs for 20-40min to achieve efficient and uniform mixing. S4 stirs for 2h to ensure that the previous ingredients are fully reacted and fused. The lubricant additive is added at 40min to avoid the disadvantages of premature addition. The subsequent stirring is continued to fully disperse the additive, thereby reducing friction, improving dispersibility, enhancing stability and imparting antibacterial properties, thereby optimizing the performance of the impregnant.

[0029] In step S5, the filtering method is performed by using a bag filter. A filter bag of selected specifications is installed in the bag filter, and the wetting agent is transported to the bag filter through a pipeline. The wetting agent flows from the inside of the filter bag to the outside, and impurities are trapped in the filter bag to complete the filtering.

[0030] The quality inspection in step S6 includes inspection of appearance, solid content, viscosity and fiber mechanical properties.

[0031] Example 1 A method for preparing a sizing agent for a glass fiber surface, the preparation steps comprising: S1. Prepare materials, including 420 parts of epoxy resin emulsion, 400 parts of polyurethane emulsion, 30 parts of coupling agent, 20 parts of lubricant, 30 parts of surfactant, 320 parts of silica nanoparticles, 90 parts of starch, 50 parts of anti-hydrolysis agent, 100 parts of quaternary ammonium salt, 110 parts of carbon nanotubes and 900 parts of deionized water; S2, adding silica nanoparticles and carbon nanotubes to deionized water respectively, adding a surfactant, and dispersing by high-speed shearing to prepare a dispersion; dissolving starch with warm water, mixing the coupling agent with deionized water, adjusting the pH to 3-4, stirring until the solution is clear, completing hydrolysis activation, and adding the dissolved starch to the hydrolysis solution to form a hydrolyzate; S3, diluting the epoxy resin emulsion and deionized water in a ratio of 1:3, stirring, stirring for 30 minutes, adding the polyurethane emulsion, and continuously stirring and mixing to form a mixed solution; S4, adding the treated dispersion, hydrolyzate and mixed solution into a reactor for mixing, continuously stirring, adding lubricant, surfactant, anti-hydrolysis agent and quaternary ammonium salt for stirring during the stirring process, waiting for the reaction stirring to be completed, and forming a wetting agent; S5, filtering the stirred infiltrate to remove impurities and particles therein; S6. The impregnating agent is uniformly applied to the surface of the glass fiber by spraying, and is heat-cured. The filtered impregnating agent and the sprayed glass fiber are quality-tested respectively. If qualified, they are packaged. If unqualified, they are re-prepared.

[0032] Example 2 A method for preparing a sizing agent for a glass fiber surface, the preparation steps comprising: S1. Prepare materials, including 400 parts of epoxy resin emulsion, 300 parts of polyurethane emulsion, 20 parts of coupling agent, 10 parts of lubricant, 10 parts of surfactant, 410 parts of silica nanoparticles, 10 parts of starch, 110 parts of anti-hydrolysis agent, 50 parts of quaternary ammonium salt, 110 parts of carbon nanotubes and 800 parts of deionized water; S2, adding silica nanoparticles and carbon nanotubes to deionized water respectively, adding a surfactant, and dispersing by high-speed shearing to prepare a dispersion; dissolving starch with warm water, mixing the coupling agent with deionized water, adjusting the pH to 3-4, stirring until the solution is clear, completing hydrolysis activation, and adding the dissolved starch to the hydrolysis solution to form a hydrolyzate; S3, diluting the epoxy resin emulsion and deionized water in a ratio of 1:3, stirring, stirring for 30 minutes, adding the polyurethane emulsion, and continuously stirring and mixing to form a mixed solution; S4, adding the treated dispersion, hydrolyzate and mixed solution into a reactor for mixing, continuously stirring, adding lubricant, surfactant, anti-hydrolysis agent and quaternary ammonium salt for stirring during the stirring process, waiting for the reaction stirring to be completed, and forming a wetting agent; S5, filtering the stirred infiltrate to remove impurities and particles therein; S6. The impregnating agent is uniformly applied to the surface of the glass fiber by spraying, and is heat-cured. The filtered impregnating agent and the sprayed glass fiber are quality-tested respectively. If qualified, they are packaged. If unqualified, they are re-prepared.

[0033] The quality inspection of the prepared Example 1 and Example 2 includes: Appearance inspection includes: Prepare a clean, transparent glass container and make sure it is free of scratches and impurities that may affect the observation results. Slowly pour the prepared samples of Example 1 and Example 2 of the infiltrant into a glass container to avoid generating bubbles. Place the glass container containing the infiltrant in an environment with sufficient and uniform light, on a laboratory workbench with a white light source, to avoid direct sunlight or too dark light. Observe whether the color of the infiltrant is uniform and whether there is obvious color difference or discoloration. Under normal circumstances, the infiltrant should have a uniform color. Check whether there is stratification, precipitation or suspended matter. Gently shake the glass container. If there is obvious stratification, or visible precipitation at the bottom, or floating suspended matter, it means that there is a problem with the stability of the infiltrant. Check whether there are any foreign objects, such as dust or fiber impurities. If any foreign objects are found, their quantity and size should be recorded.

[0034] Solid content detection Prepare a weighing instrument, weigh the samples of Example 1 and Example 2, record the data, dry the samples, wait for the drying to be completed, weigh them again, calculate, and obtain the solid content.

[0035] Viscosity testing Select a suitable viscometer, including a rotational viscometer, according to the viscosity range of the infiltrant, and calibrate it according to the instruction manual of the viscometer to ensure the accuracy of the measurement. Pour the sample of Example 1 and the sample of Example 2 into a suitable container. The size and shape of the container should meet the requirements of the viscometer. The temperature of the sample should be controlled within the specified test temperature range, generally 25°C ± 0.5°C. A constant temperature water bath can be used to control the temperature of the sample. Immerse the rotor of the viscometer in the infiltrant sample to ensure that the rotor is completely immersed and perpendicular to the liquid surface. Set the measurement parameters, including the rotor speed and the measurement time, according to the operating instructions of the viscometer; start the viscometer, and after the reading of the viscometer is stable, record the measured viscosity value. Generally, multiple measurements are required, and the average value is taken as the final result.

[0036] Glass fiber mechanical properties testing Randomly select undamaged representative fiber bundles from the treated glass fibers, cut them into 200-300mm lengths, fix both ends with clamps to ensure that the fibers are straight, and prepare the equipment: debug the universal material testing machine, calibrate the force and displacement sensors, and select the appropriate loading speed and range; control the test environment temperature to 23℃±2℃ and the humidity to 50%±5%, install the sample on the testing machine, stretch it to fracture at the set speed, record the force and deformation to draw the stress-strain curve; calculate the tensile strength and elastic modulus based on this; measure the length after fracture to calculate the elongation at fracture, count multiple test data, calculate the average value and standard deviation, and judge the degree of dispersion; compare and evaluate the performance with the standard, and analyze and improve if it does not meet the requirements.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A method for preparing a sizing agent for a glass fiber surface, characterized in that: The preparation steps are: S1. Prepare materials, including 10-720 parts of epoxy resin emulsion, 10-550 parts of polyurethane emulsion, 1-210 parts of coupling agent, 2-200 parts of lubricant, 10-150 parts of surfactant, 5-500 parts of silica nanoparticles, 1-120 parts of starch, 1-210 parts of anti-hydrolysis agent, 2-500 parts of quaternary ammonium salt, 10-200 parts of carbon nanotubes and 100-1000 parts of deionized water; S2, adding silica nanoparticles and carbon nanotubes to deionized water respectively, adding a surfactant, and dispersing by high-speed shearing to prepare a dispersion; dissolving starch with warm water, mixing the coupling agent with deionized water, adjusting the pH to 3-4, stirring until the solution is clear, completing hydrolysis activation, and adding the dissolved starch to the hydrolysis solution to form a hydrolyzate; S3, diluting the epoxy resin emulsion and deionized water in a ratio of 1:3, stirring, stirring for 30 minutes, adding the polyurethane emulsion, and continuously stirring and mixing to form a mixed solution; S4, adding the treated dispersion, hydrolyzate and mixed solution into a reactor for mixing, continuously stirring, adding lubricant, surfactant, anti-hydrolysis agent and quaternary ammonium salt for stirring during the stirring process, waiting for the reaction stirring to be completed, and forming a wetting agent; S5, filtering the stirred infiltrate to remove impurities and particles therein; S6. The impregnating agent is uniformly applied to the surface of the glass fiber by spraying, and is heat-cured. The filtered impregnating agent and the sprayed glass fiber are quality-tested respectively. If qualified, they are packaged. If unqualified, they are re-prepared.

2. The method for preparing a sizing agent for glass fiber surface according to claim 1, characterized in that: The specific amounts of materials in step S1 are: 420 parts of epoxy resin emulsion, 400 parts of polyurethane emulsion, 30 parts of coupling agent, 20 parts of lubricant, 30 parts of surfactant, 320 parts of silica nanoparticles, 90 parts of starch, 50 parts of anti-hydrolysis agent, 100 parts of quaternary ammonium salt, 110 parts of carbon nanotubes and 900 parts of deionized water.

3. The method for preparing a sizing agent for glass fiber surface according to claim 1, characterized in that: The epoxy resin emulsion in step S1 is one of anionic epoxy resin emulsion, cationic epoxy resin emulsion and nonionic epoxy resin emulsion. The epoxy resin emulsion is prepared by grinding the epoxy resin into a micron-sized epoxy resin, adding an emulsifier for emulsification, and using a phase inversion method for emulsification.

4. The method for preparing a sizing agent for glass fiber surface according to claim 1, characterized in that: In step S1, the polyurethane emulsion is one of a linear polyurethane emulsion and a cross-linked polyurethane emulsion; the coupling agent is one of a silane coupling agent, a titanate coupling agent and an aluminate coupling agent; the lubricant is one of a mineral lubricant, a plant lubricant, an animal lubricant and a synthetic lubricant; and the surfactant is one of an anionic surfactant, a cationic surfactant and a nonionic surfactant.

5. The method for preparing a sizing agent for glass fiber surface according to claim 1, characterized in that: In step S1, the silica nanoparticles are one of amorphous silica nanoparticles, mesoporous silica nanoparticles and crystalline silica nanoparticles; the anti-hydrolysis agent is one of carbodiimides, oxazolines and epoxy compounds; and the carbon nanotubes are multi-walled carbon nanotubes.

6. The method for preparing a sizing agent for glass fiber surface according to claim 1, characterized in that: In step S2, the rotation speed during the high-speed shearing process is 8000-12000r / min, the shearing time is 10-20min, and the temperature is controlled at 20-35°C; the pH adjustment method is to mix and stir the coupling agent and water, insert a calibrated pH meter into the solution, observe the pH meter reading, add olefin salt dropwise, and adjust to 3-4. If the pH value is adjusted too low, dilute sodium hydroxide is used to adjust the pH value to complete the adjustment.

7. The method for preparing a sizing agent for glass fiber surface according to claim 1, characterized in that: In step S3, the stirring method is to stir by a high-speed disperser. After adding the materials into the stirring container, stir at a low speed first. After the materials are driven, increase the speed to 1000-3000r / min and stir for 20-40min.

8. The method for preparing a sizing agent for glass fiber surface according to claim 1, characterized in that: The stirring time in step S4 is 2 hours. After stirring for 40 minutes, a lubricant, a surfactant, an anti-hydrolysis agent and a quaternary ammonium salt are added to the reaction kettle and stirred for 2 hours.

9. The method for preparing a sizing agent for glass fiber surface according to claim 1, characterized in that: In step S5, the filtering method is performed by using a bag filter. A filter bag of selected specifications is installed in the bag filter, and the wetting agent is transported to the bag filter through a pipeline. The wetting agent flows from the inside of the filter bag to the outside, and impurities are trapped in the filter bag to complete the filtering.

10. The method for preparing a sizing agent for glass fiber surface according to claim 1, characterized in that: The quality inspection in step S6 includes inspection of appearance, solid content, viscosity and fiber mechanical properties.

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