A direct yarn glass fiber sizing agent, its preparation method and application

Abstract

The application discloses a direct yarn glass fiber sizing agent, which comprises effective components and water, and the effective components comprise a silane coupling agent, a film forming agent, a lubricant, a surfactant, a plasticizer, inorganic nanoparticles and a pH value regulator, and the solid content of the sizing agent is 6-9%; the solid mass percentage of each effective component in the total solid mass of the sizing agent is shown as follows: the silane coupling agent is 5-25%; the film forming agent is 48-75%; the lubricant is 8-20%; the surfactant is 1-6%; the plasticizer is 1-5%; the inorganic nanoparticles are 0.1-2%; and the pH value regulator is 1-8%; wherein the film forming agent is a mixture of a first film forming agent and a second film forming agent; the first film forming agent is a fluorine-containing epoxy emulsion with a molecular weight of 1500-2200; and the second film forming agent is an organic silicon modified polyurethane emulsion with a molecular weight of 1800-2700. The glass fiber yarn produced by using the sizing agent formula is soft, has good bundling property, less hairiness, good use smoothness, can be quickly soaked in resin such as an epoxy resin or a polyurethane resin, and is suitable for various resin systems.

Description

Technical Field

[0001] This application relates to the field of glass fiber surface treatment agents, and in particular to a glass fiber impregnating agent for direct yarn, its preparation method, and its application. Background Technology

[0002] In recent years, with the rapid development of the wind power market and the arrival of the era of grid parity for wind power, heavy-duty wind turbine fabrics have attracted increasing attention from blade manufacturers and wind turbine OEMs. Heavy-duty wind turbine fabrics not only improve installation efficiency but also increase fiberglass content, reduce resin usage, and increase blade stiffness while lowering costs. The design of heavy-duty wind turbine fabrics places high demands on the weft yarn. On the one hand, ultra-low linear density yarns (such as 68 tex) must be used to ensure uniform weft laying; on the other hand, the yarns must have good smoothness of use and be able to quickly and fully impregnate various resins such as epoxy resin and polyurethane resin.

[0003] With the further development of the wind power market, in the next few years, heavy-weight wind turbine fabrics will definitely be widely used in wind turbine blades, and the demand for ultra-low linear density yarns will also increase.

[0004] Therefore, it is essential to design an ultra-low linear density direct yarn that can be used as a weft yarn in the production of heavy-weight wind power fabrics and can be quickly impregnated in epoxy and polyurethane resins. This is of great significance for promoting the development of the entire wind power industry. Summary of the Invention

[0005] This application aims to provide a glass fiber impregnating agent for direct yarn production. Using this impregnating agent in the production of glass fiber results in good yarn lubrication, enabling good drawing operation during the production of direct yarn. Glass fiber yarn produced using this impregnating agent has good abrasion resistance, less fuzz, good smoothness for customers to use, and is soft. It can be quickly impregnated in both epoxy resin and polyurethane resin, making it very suitable for weaving processes.

[0006] According to a first aspect of this application, a direct-yarn glass fiber impregnating agent is provided, comprising an effective component and water, wherein the effective component comprises a silane coupling agent, a film-forming agent, a lubricant, a surfactant, a plasticizer, inorganic nanoparticles, and a pH adjuster, and the solid content of the impregnating agent is 6-9%; the percentage of the solid mass of each effective component to the total solid mass of the impregnating agent is expressed as follows:

[0007]

[0008]

[0009] The film-forming agent is a mixture of a first film-forming agent and a second film-forming agent; the first film-forming agent is a fluorinated epoxy emulsion with a molecular weight of 1500-2200; and the second film-forming agent is an organosilicon-modified polyurethane emulsion with a molecular weight of 1800-2700.

[0010] Preferably, the silane coupling agent is a mixture of an aminosilane coupling agent and an isocyanate-based silane coupling agent.

[0011] Preferably, the mass ratio C1 of the aminosilane coupling agent to the isocyanate-based silane coupling agent is 1:1 to 6:1.

[0012] Preferably, the aminosilane coupling agent is γ-(β-aminoethyl)aminopropyltrimethoxysilane and / or γ-ureapropyltriethoxysilane, and the isocyanate-based silane coupling agent is 3-isocyanate-propyltrimethoxysilane and / or 3-isocyanate-propylmethyldimethoxysilane.

[0013] Preferably, the solid mass ratio C2 of the first film-forming agent to the second film-forming agent is 1:3 to 2:1.

[0014] Preferably, the lubricant is a modified silicone oil lubricant or / and an acrylate lubricant.

[0015] Preferably, the surfactant is a pyrrolidone surfactant.

[0016] Preferably, the plasticizer is at least one of terephthalate plasticizers, adipate plasticizers, chlorinated paraffin, and epoxy fatty acid ester plasticizers.

[0017] Preferably, the plasticizer is a mixture of dioctyl terephthalate and methyl epoxide fatty acid ester.

[0018] Preferably, the inorganic nanoparticles are at least one of nano-silica, nano-titanium dioxide, and nano-alumina.

[0019] According to a second aspect of this application, a method for preparing the aforementioned direct-yarn glass fiber impregnating agent is provided, comprising:

[0020] Add water, which accounts for 30% to 40% of the total mass of the wetting agent, to the first container. Then add the pH adjuster and the silane coupling agent in sequence, and stir until the solution is clear to obtain the first solution.

[0021] In the second container, a film-forming agent diluted with water, a plasticizer, and inorganic nanoparticles diluted with water are added sequentially and mixed and stirred evenly to obtain a second solution.

[0022] After adding the second solution to the first solution, lubricant diluted with water and surfactant diluted with water are added in sequence, and the remaining water is added. The mixture is stirred evenly to obtain the glass fiber impregnating agent for direct yarn.

[0023] According to a third aspect of this application, a glass fiber product produced by coating with the aforementioned direct yarn glass fiber impregnating agent is provided.

[0024] According to the fourth aspect of this application, the aforementioned direct yarn glass fiber impregnating agent is provided for use in the preparation of yarn for wind power fabrics.

[0025] Glass fiber yarns produced using the sizing agent formulation of this application are soft, have good bundle properties, low fuzziness, and good smoothness of use. The yarns can be quickly impregnated in resins such as epoxy resin or polyurethane resin, making them suitable for a variety of resin systems. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0027] In some optional embodiments, a direct-yarn glass fiber impregnating agent is provided, comprising an effective component and water. The effective component comprises a silane coupling agent, a film-forming agent, a lubricant, a surfactant, a plasticizer, inorganic nanoparticles, and a pH adjuster. The solid content of the impregnating agent is 6-9%. The percentage of the solid mass of each effective component relative to the total solid mass of the impregnating agent is expressed as follows: silane coupling agent 5-25%, film-forming agent 48-75%, lubricant 8-20%, surfactant 1-6%, plasticizer 1-5%, inorganic nanoparticles 0.1-2%, and pH adjuster 1-8%. The film-forming agent is a mixture of a first film-forming agent and a second film-forming agent. The first film-forming agent is a fluorinated epoxy emulsion with a molecular weight of 1500-2200; the second film-forming agent is an organosilicon-modified polyurethane emulsion with a molecular weight of 1800-2700.

[0028] In some optional embodiments, a direct-yarn glass fiber impregnating agent is provided, comprising an effective component and water. The effective component comprises a silane coupling agent, a film-forming agent, a lubricant, a surfactant, a plasticizer, inorganic nanoparticles, and a pH adjuster. The solid content of the impregnating agent is 6-9%. The percentage of the solid mass of each effective component relative to the total solid mass of the impregnating agent is as follows: silane coupling agent 10-20%, film-forming agent 52-70%, lubricant 12-19%, surfactant 2-5%, plasticizer 1-4%, inorganic nanoparticles 0.2-1%, and pH adjuster 2-6%. The film-forming agent is a mixture of a first film-forming agent and a second film-forming agent. The first film-forming agent is a fluorinated epoxy emulsion with a molecular weight of 1500-2200; the second film-forming agent is an organosilicon-modified polyurethane emulsion with a molecular weight of 1800-2700.

[0029] In some optional embodiments, a direct-yarn glass fiber impregnating agent is provided, comprising an effective component and water. The effective component comprises a silane coupling agent, a film-forming agent, a lubricant, a surfactant, a plasticizer, inorganic nanoparticles, and a pH adjuster. The solid content of the impregnating agent is 6-9%. The percentage of the solid mass of each effective component relative to the total solid mass of the impregnating agent is expressed as follows: silane coupling agent 10-16%, film-forming agent 55-68%, lubricant 14-17%, surfactant 2-4%, plasticizer 1-3%, inorganic nanoparticles 0.3-0.5%, and pH adjuster 3-5%. The film-forming agent is a mixture of a first film-forming agent and a second film-forming agent. The first film-forming agent is a fluorinated epoxy emulsion with a molecular weight of 1500-2200; the second film-forming agent is an organosilicon-modified polyurethane emulsion with a molecular weight of 1800-2700.

[0030] In this application, silane coupling agent is one of the most reactive raw materials among wetting agents. The silanol groups formed after hydrolysis are highly reactive and can react with the silanol groups on the glass fiber surface to form Si-O-Si bonds. In glass fibers, silane coupling agent plays two main roles: First, during the glass fiber drawing process, due to the high drawing speed, microcracks form on the glass fiber surface. Silane coupling agent molecules can effectively compensate for these microcracks by reacting with the silanol groups on the glass fiber surface, ensuring normal glass fiber drawing. Second, silane coupling agent acts as a "bridge" between glass fiber and resin. The R groups on the silane coupling agent can react with the functional groups on the matrix resin, while the hydroxyl groups can combine with the hydroxyl groups on the glass fiber. Therefore, it can form a reactive connection between the resin and glass fiber, thereby improving performance. The amount of silane coupling agent used needs to be controlled within a certain range. If the amount of silane coupling agent is too small, the performance of the glass fiber and composite material will be affected due to insufficient active groups; if the amount of silane coupling agent is too large, it will lead to waste and increased costs. This application controls the percentage of the solid mass of the silane coupling agent to the total solid mass of the wetting agent to be 5% to 25%, preferably 10% to 20%, and more preferably 10% to 16%.

[0031] Film-forming agents are the main component of sizing agents, not only protecting the glass fiber surface but also affecting subsequent performance. The amount of film-forming agent used must be controlled within a suitable range. Studies have found that insufficient film-forming agent results in poor sizing effect, preventing even spreading on the glass fiber surface and failing to provide effective protection during use, leading to yarn breakage. Excessive film-forming agent reduces the lubricity of the glass fiber surface, increases fuzzing during use, and hinders resin penetration. A reasonable amount of film-forming agent effectively protects the glass fiber surface without affecting the smoothness of product use. This application controls the percentage of the solid mass of the film-forming agent to the total solid mass of the sizing agent to be 48%–75%, preferably 52%–70%, and more preferably 55%–68%.

[0032] The film-forming agent in this application is a mixture of a first film-forming agent and a second film-forming agent. The first film-forming agent is a fluorinated epoxy emulsion with a molecular weight of 1500-2200; the second film-forming agent is a silicone-modified polyurethane emulsion with a molecular weight of 1800-2700. The fluorinated epoxy emulsion and the silicone-modified polyurethane emulsion not only have good film-forming properties, but also exhibit good lubricity on the surface after film formation, thus providing better protection for the yarn during product use.

[0033] Lubricant is one of the main components of glass fiber impregnation agents, primarily used to ensure the smooth operation of glass fibers during drawing and use. The amount of lubricant used is crucial in glass fiber production; too little lubricant will fail to provide adequate lubrication during drawing and use, while too much will make the yarn too soft and affect its bonding with the resin. This application controls the solid mass of the lubricant to be 8%–20% of the total solid mass of the impregnation agent, preferably 12%–19%, and more preferably 14%–17%.

[0034] Surfactants, due to their amphiphilic nature, primarily function to stabilize the components of the wetting agent. The wetting agent has a complex composition, and different components are prone to aggregation or even precipitation after mixing, affecting the normal fiber drawing process and the uniformity of the wetting agent coating. Adding an appropriate amount of surfactant can effectively solve these problems. The amount of surfactant needs to be controlled within a reasonable range; too little surfactant will not achieve the desired stabilizing effect, while too much surfactant can easily affect the effects of other components. This application controls the solid mass of the surfactant to account for 1% to 6% of the total solid mass of the wetting agent, preferably 2% to 5%, and more preferably 2% to 4%.

[0035] Sizing agents containing plasticizers can soften yarns, which helps reduce yarn fuzz during use. However, excessive use of plasticizers can affect the impregnation performance of the yarn in the resin. This application controls the percentage of the solid mass of the plasticizer to the total solid mass of the sizing agent to be 1% to 5%, preferably 1% to 4%, and more preferably 1% to 3%.

[0036] This application also incorporates inorganic nanoparticles, which can be dispersed in the film-forming agent to reinforce weaker micro-regions of the resin. Typically, only a small amount is needed to effectively enhance the strength of the film-forming agent, making the yarn less prone to wear during use. This application controls the percentage of the solid mass of the inorganic nanoparticles to the total solid mass of the sizing agent to be 0.1% to 2%, preferably 0.2% to 1%, and more preferably 0.3% to 0.5%.

[0037] The pH adjuster is mainly used to accelerate the hydrolysis of silane coupling agents and adjust the pH of the wetting agent to a value of 5-7. In this application, the solid mass of the pH adjuster accounts for 1% to 8% of the total solid mass of the wetting agent, preferably 2% to 6%, and more preferably 3% to 5%.

[0038] In some optional embodiments, the silane coupling agent is a mixture of aminosilane coupling agent and isocyanate-based silane coupling agent. The sizing agent of this application is mainly used in ultra-low linear density direct yarns, therefore requiring high yarn bundle cohesion. The aminosilane coupling agent contains amine groups, which have very high activity, beneficial for ensuring the overall bundle cohesion of the glass fiber; the isocyanate groups in the isocyanate-based silane coupling agent can participate in the curing process of epoxy resin and polyurethane resin, improving interfacial bonding performance.

[0039] In some optional embodiments, the silane coupling agent is a mixture of aminosilane coupling agent and isocyanate-based silane coupling agent, and the mass ratio (C1) of the aminosilane coupling agent to the isocyanate-based silane coupling agent is 1:1 to 6:1. Aminosilane coupling agents are highly reactive; excessive use can lead to self-polymerization of the coupling agent, making the entire yarn brittle. Excessive use of isocyanate-based silane coupling agent can result in insufficient yarn bundling performance, causing loose yarn during use and affecting smoothness. This application controls the mass ratio (C1) of the aminosilane coupling agent to the isocyanate-based silane coupling agent to be 1:1 to 6:1, which minimizes the risk of self-polymerization of the coupling agent, and the sizing agent ensures the bundling performance of the yarn. In other optional embodiments, the mass ratio (C1) of the aminosilane coupling agent to the isocyanate-based silane coupling agent is 3:1 to 4:1. For example, the mass ratio C1 of the aminosilane coupling agent and the isocyanate-based silane coupling agent is 1:1, 2:1, 3:1, 3.5:1, 4:1, 5:1 or 6:1.

[0040] In some optional embodiments, the aminosilane coupling agent is γ-(β-aminoethyl)aminopropyltrimethoxysilane and / or γ-ureapropyltriethoxysilane, and the isocyanate-based silane coupling agent is 3-isocyanate-based propyltrimethoxysilane.

[0041] In some optional embodiments, the solid mass ratio C2 of the first film-forming agent and the second film-forming agent is 1:3 to 2:1. Excessive use of the first film-forming agent (fluorinated epoxy emulsion with a molecular weight of 1500-2200) will result in poor impregnation of the product in the resin; excessive use of the second film-forming agent (organosilicon-modified polyurethane emulsion with a molecular weight of 1800-2700) will result in excessively loose yarns, forming loose filaments. When the solid mass ratio C2 of the first and second film-forming agents is controlled to be 1:3 to 2:1, the prepared glass fiber achieves excellent properties. In other optional embodiments, the solid mass ratio C2 of the first and second film-forming agents is 1:2 to 1:1. Exemplarily, the solid mass ratio C2 of the first and second film-forming agents is 1:3, 1:2.5, 1:2, 1:1.5, 1:1, 1.5:1, or 2:1.

[0042] In some optional embodiments, the lubricant of this application is a modified silicone oil lubricant or / and an acrylate lubricant.

[0043] In some optional embodiments, the lubricant is a mixture of modified silicone oil lubricant and acrylate lubricant, and the mass ratio (C3) of the modified silicone oil lubricant to the acrylate lubricant is 2:1 to 6:1. This mixture of the two lubricants provides better lubrication, reducing wear during production and fuzzing during use. In other optional embodiments, the mass ratio (C3) of the modified silicone oil lubricant to the acrylate lubricant is 3:1 to 4:1. Exemplarily, the mass ratio (C3) of the modified silicone oil lubricant to the acrylate lubricant is 2:1, 3:1, 3.5:1, 4:1, 5:1, or 6:1.

[0044] In some optional embodiments, the surfactant of this application is a pyrrolidone surfactant.

[0045] In some optional embodiments, the plasticizer is at least one of terephthalate plasticizers, adipate plasticizers, chlorinated paraffins, and epoxy fatty acid ester plasticizers.

[0046] In some optional embodiments, the plasticizer is a mixture of dioctyl terephthalate and methyl epoxide, and the mass ratio (C4) of dioctyl terephthalate to methyl epoxide is 2:1 to 5:1. In other optional embodiments, the mass ratio of dioctyl terephthalate to methyl epoxide is 2.5:1 to 4:1. Exemplary examples include mass ratios of 2.5:1, 3:1, 3.5:1, and 4:1.

[0047] In some optional embodiments, the inorganic nanoparticles are at least one of nano-silica, nano-titanium dioxide, and nano-alumina.

[0048] In some optional embodiments, the pH adjuster is an acid, specifically glacial acetic acid and / or citric acid.

[0049] In some optional embodiments, a method for preparing the aforementioned direct-yarn glass fiber impregnating agent is provided, comprising:

[0050] Add water, which accounts for 30% to 40% of the total mass of the wetting agent, to the first container. Then add the pH adjuster and the silane coupling agent in sequence, and stir until the solution is clear to obtain the first solution.

[0051] In the second container, a film-forming agent diluted with water, a plasticizer, and inorganic nanoparticles diluted with water are added sequentially and mixed and stirred evenly to obtain a second solution.

[0052] After adding the second solution to the first solution, add the lubricant diluted with water and the surfactant diluted with water in sequence, add the remaining water, stir evenly, and obtain the direct yarn glass fiber impregnating agent.

[0053] The film-forming agent is diluted with 3-5 times its mass of water to obtain a water-diluted film-forming agent.

[0054] Inorganic nanoparticles were diluted with 8-10 times their mass of water at 50°C to obtain inorganic nanoparticles diluted with water.

[0055] Dilute the lubricant with 4-6 times its mass of water to obtain a lubricant diluted with water;

[0056] The surfactant is diluted with 6-8 times its mass of water at 50°C to obtain a surfactant diluted with water.

[0057] In some alternative embodiments, a glass fiber product produced by coating with the aforementioned direct yarn glass fiber impregnating agent is provided.

[0058] In some alternative embodiments, the linear density of the glass fiber product may be less than 100 tex.

[0059] In some alternative embodiments, the aforementioned direct yarn glass fiber impregnating agent is provided for use in the preparation of yarn for wind power fabrics.

[0060] Glass fiber yarns produced using the sizing agent formulation of this application are soft, have good bundle properties, low fuzziness, and good smoothness of use. The yarns can be quickly impregnated in resins such as epoxy resin or polyurethane resin, making them suitable for a variety of resin systems.

[0061] To further illustrate the beneficial effects of the selected component types and component content ranges in the glass fiber impregnating agent for direct yarn of this application, the following are examples of some values ​​of the components included in the glass fiber impregnating agent for direct yarn of this application.

[0062] The component allocations of some embodiments of the direct yarn glass fiber impregnating agent of this application are shown in Table 1. The amount of each effective component in Table 1 is the percentage of the solid mass of the effective component to the total solid mass of the impregnating agent.

[0063] Table 1 shows the component ratios of the wetting agent in the embodiments.

[0064]

[0065] Table 1 (continued) Distribution ratio of each component of the wetting agent in the examples

[0066]

[0067] Table 1 (continued) Distribution ratio of each component of the wetting agent in the examples

[0068]

[0069] In Examples 1-15, the fluorinated epoxy emulsion is a fluorinated epoxy emulsion with a molecular weight of 1500-2200; the organosilicon-modified polyurethane emulsion is an organosilicon-modified polyurethane emulsion with a molecular weight of 1800-2700.

[0070] To further illustrate the beneficial effects of this application, two commonly used direct-yarn glass fiber impregnating agents were selected as comparative examples, namely Comparative Examples 1 and 2. The formulations of Comparative Examples 1 and 2 are shown in Table 2, wherein the amount of each effective component is the percentage of the solid mass of the effective component to the total solid mass of the impregnating agent.

[0071] Comparative Example 1

[0072] The wetting agent contains active ingredients and water, with a solid content of 7.5%. The percentage of solid mass of each active ingredient in the total solid mass of the wetting agent is expressed as follows:

[0073] 15% aminosilane coupling agent;

[0074] First film-forming agent: 30% epoxy resin;

[0075] Second film-forming agent: 35% polyurethane resin;

[0076] Lubricant: 12% modified polyether lubricant;

[0077] Surfactant: 5% quaternary ammonium salt surfactant;

[0078] pH adjuster: 3% glacial acetic acid.

[0079] Comparative Example 2

[0080] The wetting agent contains active ingredients and water, with a solid content of 6.5%. The percentage of solid mass of each active ingredient to the total solid mass of the wetting agent is expressed as follows:

[0081] 12% aminosilane coupling agent

[0082] 5% epoxy silane coupling agent;

[0083] Film-forming agent: 60% epoxy resin;

[0084] Lubricant: 15% fatty acid amide lubricant;

[0085] Surfactant: 5% quaternary ammonium salt surfactant;

[0086] pH adjuster: 3% citric acid.

[0087] Table 2 records the performance test results of the glass fiber impregnating agent for direct yarn in Examples 1-15 and Comparative Examples 1-2 of this application:

[0088] Table 2 Test results of the examples and comparative examples

[0089]

[0090] Table 2 (continued) Test results of examples and comparative examples

[0091]

[0092] Table 2 (continued) Test results of examples and comparative examples

[0093]

[0094] As can be seen from the above embodiments, by selecting the types and designing the content of each component of the sizing agent, we can obtain a sizing agent formulation that meets the requirements. Compared with Comparative Examples 1 and 2, the glass fiber prepared in Examples 1-15 of this application has good production operation, less glass fiber hair, good smoothness of use, and the yarn can be well impregnated in polyurethane and epoxy resin.

[0095] In summary, this sizing agent formulation is suitable for the production of ultra-low linear density direct yarns; glass fiber yarns produced using this sizing agent formulation are soft, have good bundle properties, low fuzziness, and good smoothness of use. The yarns can be quickly and well impregnated in resins such as epoxy resin or polyurethane resin, and are suitable for a variety of resin systems.

[0096] It should be noted that, in this application, the solid mass of each effective component refers to the mass of the non-aqueous substance in each effective component, and is not limited to solid components; for example, the lubricant can be a liquid silicone oil lubricant, and the solid mass of the liquid silicone oil lubricant refers to the mass of its effective substance, not the mass of solid components.

[0097] Finally, it should be noted that in this document, 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 limitation, 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.

[0098] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A glass fiber impregnating agent for direct yarn, characterized in that, The sizing agent comprises an active ingredient and water. The active ingredient includes a silane coupling agent, a film-forming agent, a lubricant, a surfactant, a plasticizer, inorganic nanoparticles, and a pH adjuster. The solid content of the sizing agent is 6-9%. The percentage of the solid mass of each active ingredient to the total solid mass of the sizing agent is expressed as follows: Silane coupling agent 5-25%; Film-forming agent 48-75%; Lubricant 8-20%; Surfactant 1-6%; Plasticizer 1-5%; Inorganic nanoparticles 0.1-2%; pH adjuster 1-8%; The film-forming agent is a mixture of a first film-forming agent and a second film-forming agent; the first film-forming agent is a fluorinated epoxy emulsion with a molecular weight of 1500-2200; the second film-forming agent is an organosilicon-modified polyurethane emulsion with a molecular weight of 1800-2700. The solid mass ratio C2 of the first film-forming agent to the second film-forming agent is 1:2 to 1.5:1; The sizing agent is applied to ultra-low linear density direct yarn.

2. The glass fiber impregnating agent for direct yarn according to claim 1, characterized in that, The silane coupling agent is a mixture of aminosilane coupling agent and isocyanate-based silane coupling agent.

3. The glass fiber impregnating agent for direct yarn according to claim 2, characterized in that, The mass ratio (C1) of the aminosilane coupling agent to the isocyanate-based silane coupling agent is 1:1 to 6:

1.

4. The glass fiber impregnating agent for direct yarn according to claim 2, characterized in that, The aminosilane coupling agent is γ-(β-aminoethyl)aminopropyltrimethoxysilane and / or γ-ureapropyltriethoxysilane, and the isocyanate-based silane coupling agent is 3-isocyanate-propyltrimethoxysilane and / or 3-isocyanate-propylmethyldimethoxysilane.

5. The glass fiber impregnating agent for direct yarn according to claim 1, characterized in that, The lubricant is a modified silicone oil lubricant or / and an acrylate lubricant; The surfactant is a pyrrolidone surfactant.

6. The glass fiber impregnating agent for direct yarn according to claim 1, characterized in that, The plasticizer is at least one of terephthalate plasticizers, adipate plasticizers, chlorinated paraffin, and epoxy fatty acid ester plasticizers.

7. The glass fiber impregnating agent for direct yarn according to claim 1, characterized in that, The plasticizer is a mixture of dioctyl terephthalate and methyl epoxide.

8. The glass fiber impregnating agent for direct yarn according to claim 1, characterized in that, The inorganic nanoparticles are at least one of nano-silica, nano-titanium dioxide, and nano-alumina.

9. A method for preparing a glass fiber impregnating agent for direct yarn as described in any one of claims 1-8, characterized in that, include: Add water, which accounts for 30% to 40% of the total mass of the wetting agent, to the first container. Then add the pH adjuster and the silane coupling agent in sequence, and stir until the solution is clear to obtain the first solution. In the second container, a film-forming agent diluted with water, a plasticizer, and inorganic nanoparticles diluted with water are added sequentially and mixed and stirred evenly to obtain a second solution. After adding the second solution to the first solution, lubricant diluted with water and surfactant diluted with water are added in sequence, and the remaining water is added. The mixture is stirred evenly to obtain the glass fiber impregnating agent for direct yarn.

10. A glass fiber product produced by coating with the direct yarn glass fiber impregnating agent according to any one of claims 1-8.

11. The application of the direct yarn glass fiber impregnating agent according to any one of claims 1-8 in the preparation of yarn for wind power fabrics.

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