A glass fiber bulk yarn impregnating agent, its preparation method, product and application

Abstract

This application provides a sizing agent for glass fiber expanded yarn used in automotive mufflers. The sizing agent contains solid components and water. The solid components include silane coupling agent A, silane coupling agent B, film-forming agent A, film-forming agent B, lubricant, bulking agent, dispersant, and pH adjuster; the solid components account for 3-5% of the total mass of the sizing agent. Glass fibers coated with this sizing agent exhibit excellent dispersibility, low hairiness, good bulkiness after expansion processing, high temperature resistance, and corrosion resistance, and have good noise absorption effects, making it suitable for the production of automotive mufflers.

Description

Technical Field

[0001] This application relates to the field of glass fiber impregnating agents, specifically to a glass fiber bulk yarn impregnating agent for automotive mufflers, its preparation method, product, and application. Background Technology

[0002] In the early 20th century, with the rapid development of the automotive industry, early automotive noise problems attracted attention, and automakers began to focus on solving them. In the early 1930s, Carlson of Sweden developed the world's first vibration-isolated muffler, a cylindrical muffler made of steel plate. Subsequently, Bickermann of Germany designed the first tubular resistive muffler in 1936. This type of muffler placed sound-absorbing material inside a pipe, reducing noise through resistive sound absorption. In mufflers, glass fiber is commonly used as the sound-absorbing material, filling the muffler shell. The fine fiber structure of glass fiber has good sound absorption properties, effectively absorbing mid-to-high frequency noise; in addition, glass fiber also has good insulation properties, preventing electromagnetic interference. Due to its excellent sound absorption effect, high temperature resistance, and high cost-effectiveness, it is still widely used in the field of automotive noise reduction.

[0003] Bulk fiberglass yarn is a special type of glass fiber. It is produced using a compressed air jetting method, where continuous glass fiber yarn is passed through a deformation nozzle. Inside the nozzle, the compressed air creates turbulent impact and disturbance, causing the fibers in the yarn to separate and increase in volume, thus forming bulky yarn. In twisted bulky yarn, loops are formed as the volume increases, while in untwisted roving bulky yarn, almost no loops are formed; it only increases in volume. Due to this processing characteristic, bulky yarn combines the high strength of long fibers with the bulkiness of short fibers. It is a new type of harmless material with high temperature resistance, low thermal conductivity, corrosion resistance, high void ratio, and high filtration efficiency, and can be widely used in automotive, construction, insulation, and sound insulation applications.

[0004] Bulked glass fiber yarn for automotive mufflers possesses properties such as bulkiness, high temperature resistance, and acid corrosion resistance, making it suitable for use in automotive mufflers. To ensure good noise reduction performance, the bulked yarn must have excellent bulkiness. Currently, domestically produced bulked yarns are generally quite sticky, making it difficult to disperse during the bulking process, resulting in poor bulking and consequently, inadequate noise reduction. Furthermore, excessive fuzz reduces yarn strength, making it prone to breakage. There is an urgent need to solve these technical challenges related to yarn dispersion, excessive fuzz, and poor bulking. Summary of the Invention

[0005] This application aims to provide a glass fiber expanded yarn impregnating agent for automotive mufflers. Glass fibers coated with this impregnating agent exhibit good dispersibility and low hairiness. After expansion processing, they possess excellent bulkiness, high temperature resistance, and corrosion resistance, and have a good noise absorption effect, making them suitable for the production of automotive mufflers.

[0006] According to one aspect of this application, a glass fiber bulky yarn impregnating agent for automotive mufflers is provided, comprising silane coupling agent A, silane coupling agent B, film-forming agent A, film-forming agent B, lubricant, dispersant, bulking agent, and pH adjuster; wherein the solid content of the impregnating agent is 3-5%, and the balance is water; the percentage of solid mass of each component to the solid mass of the impregnating agent is expressed as follows:

[0007]

[0008] Preferably, the percentage of the solid mass of each component in the glass fiber impregnating agent is expressed as follows:

[0009]

[0010] More preferably, the percentage of the solid mass of each component in the glass fiber impregnating agent is expressed as follows:

[0011]

[0012] The leavening agent is an epoxy polysiloxane.

[0013] Wherein, silane coupling agent A is an aminosilane coupling agent; and silane coupling agent B is an epoxysilane coupling agent.

[0014] Preferably, in the glass fiber impregnating agent, the mass ratio of silane coupling agent A to silane coupling agent B is 1:0.5 to 1:2.

[0015] The film-forming agent A is a polyolefin maleic anhydride copolymer with a molecular weight of 3000-8000.

[0016] The film-forming agent B is a polyurethane-modified epoxy resin emulsion with an epoxy equivalent of 220–350 g / eq.

[0017] Preferably, in the glass fiber impregnating agent, the mass ratio of film-forming agent A to film-forming agent B is 1:1.5 to 1:4.

[0018] The lubricant is a random polyether lubricant.

[0019] The dispersant is an ammonium salt cationic dispersant.

[0020] The pH adjuster is acetic acid and / or citric acid; the pH of the wetting agent is 3 to 6.

[0021] In this application, two silane coupling agents are introduced: silane coupling agent A and silane coupling agent B. During the fiber drawing process, microcracks form on the surface of the glass fiber due to the traction force. The Si-OH generated by the hydrolysis of the silane coupling agent reacts with the active silanol groups on the glass fiber surface to form Si-O-Si bonds, which effectively compensate for these microcracks and ensure normal fiber drawing production. The selection of epoxy-based silane coupling agents and amino-based silane coupling agents allows for better compatibility with the polyurethane-modified epoxy resin film-forming agent, enabling the polyurethane epoxy resin film-forming agent to be efficiently coated onto the glass fiber surface during fiber drawing. Among them, the aminosilane coupling agent can be selected from γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, or γ-aminoethylaminopropyltrimethoxysilane coupling agent, and the epoxysilane coupling agent can be one or a mixture of several of β-(3,4-epoxycyclohexyl)ethyltrimethylsilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and γ-(2,3-epoxypropoxy)propylmethyldiethoxysilane coupling agent.

[0022] In this application, the ratio of silane coupling agent A to silane coupling agent B is crucial. Because the production of automotive mufflers requires the expansion of glass fibers under high pressure, this process can easily damage the glass fibers. Studies have found that insufficient silane coupling agent leads to incomplete coating of the glass fiber surface, inadequate compensation for microcracks, and increased susceptibility to breakage during the expansion process. Conversely, excessive silane coupling agent can cause cross-linking, resulting in poor yarn dispersion and ineffective expansion. Therefore, in this application, the percentage of solid mass of silane coupling agent A in the solid mass of the sizing agent is 1%–7%, preferably 2%–6%, and more preferably 3%–5%; the percentage of solid mass of silane coupling agent B in the solid mass of the sizing agent is 2%–11%, preferably 4%–9%, ​​and more preferably 5%–8%. Furthermore, the ratio of silane coupling agent A to silane coupling agent B in this application is also very important. If too much silane coupling agent A is used, it can easily lead to self-polymerization of the aminosilane coupling agent, affecting the dispersibility of the glass fiber and resulting in poor expansion effect. If too little silane coupling agent A is used, its relatively stronger reactivity compared to coupling agent B can easily cause incomplete coating of the glass fiber surface, similarly affecting the performance of the glass fiber. Therefore, this application controls the mass ratio of aminosilane coupling agent to epoxysilane coupling agent to be 1:0.5 to 1:2, preferably 1:1 to 1:1.5. Specifically, when the mass ratio of aminosilane coupling agent to epoxysilane coupling agent is 1:1.2, the glass fibers produced by the sizing agent prepared in combination with other components can meet the required properties well.

[0023] Film-forming agents are the main components of sizing agents, primarily serving to protect glass fibers, determining their stiffness and dispersibility, and also affecting the smoothness of subsequent processing. In this application, the glass fiber sizing agent includes film-forming agent A and film-forming agent B. Film-forming agent A is selected from polyolefin maleic anhydride copolymers with a molecular weight of 3000-8000, specifically, it can be a polypropylene maleic anhydride copolymer; film-forming agent B is selected from polyurethane-modified epoxy emulsions with an epoxy equivalent of 220-350 g / eq. Polyolefin maleic anhydride copolymers can give glass fibers excellent flexibility, elongation, abrasion resistance, dryness, and impact resistance, ensuring the initial bundled nature of the glass fibers and their dispersibility after tensioning, thus guaranteeing the swelling effect. Polyurethane-modified epoxy resin can give glass fibers good elasticity, abrasion resistance, and impact resistance, and can also appropriately increase the stiffness of the glass fibers, maintaining the bulkiness of the swollen glass fibers. The dosage of film-forming agent A and film-forming agent B needs to be within an appropriate range to achieve a good effect. If the amount of polyolefin maleic anhydride copolymer is too large, its hydrolysis will produce a large number of carboxyl groups, which will disrupt the stability of the emulsifier in other components, leading to demulsification and precipitation of the glass fiber impregnating agent (for example, glyceryl stearate is unstable under strong acid conditions; sodium dodecyl sulfate is easily hydrolyzed into lauryl alcohol and sodium bisulfate in a strongly acidic environment, resulting in a decrease in the effective ingredients). If the amount is too small, it will cause insufficient toughness of the glass fiber, making it prone to breakage during high-pressure air expansion. If the amount of polyurethane modified epoxy resin is too large, it will make the glass fiber sticky, affecting the expansion effect; if the amount is too small, it will lead to a decrease in the stiffness of the glass fiber, affecting the maintenance of the bulkiness of the expanded glass fiber. Therefore, the solid mass of film-forming agent A in this application accounts for 8% to 23% of the solid mass of the wetting agent, preferably 10% to 20%, and more preferably 12% to 18%; the solid mass of film-forming agent B accounts for 34% to 52% of the solid mass of the wetting agent, preferably 37% to 50%, and more preferably 40% to 47%.

[0024] This application controls the mass ratio of film-forming agent A to film-forming agent B to be 1:1.5 to 1:4, preferably 1:2 to 1:3. Specifically, when the mass ratio of film-forming agent A to film-forming agent B is 1:2.8, the glass fibers produced by the sizing agent prepared in combination with other components can meet the required properties well.

[0025] In this application, a random polyether lubricant is used. Lubricant is an essential component of glass fiber impregnation agents. The use of lubricant can increase the lubrication effect of glass fibers during drawing and processing, reduce damage to the glass fiber surface, and reduce fuzz formation during the expansion process. The lubricant used in this application is glycerol random polyether. Random polyether lubricants have low moisture absorption, are essentially non-toxic, have good dispersibility, strong emulsifying power, and good low-temperature fluidity; after emulsification, they can be well dispersed in water, providing excellent lubrication and ensuring smooth operation of the glass fiber, reducing fuzz formation; their low moisture absorption ensures the dryness of the expanded glass fiber, maintains its bulkiness, and guarantees sound absorption. Insufficient lubricant will affect the smoothness of the yarn drawing process, easily causing yarn wear, burrs, and yarn breakage. Excessive lubricant will affect the yarn dispersion, and excess lubricant will adhere to the tension roller and the expanding nozzle. Over time, the amount of lubricant adhering to the tension roller and nozzle increases, increasing adhesion and affecting the smoothness of yarn use and the expanding effect. Therefore, the percentage of solid mass of the lubricant in this application is 2% to 9% of the solid mass of the sizing agent, preferably 4% to 7%, and more preferably 5% to 6%.

[0026] In this application, the bulking agent is a key component, primarily responsible for the fluffing of the yarn, ensuring the expansion effect and bulkiness of the glass fiber. The bulking agent used in this application is epoxy polysiloxane. The main function of epoxy polysiloxane is to inhibit specific adsorption and improve separation effect; simultaneously, epoxy polysiloxane can fill microcracks generated during glass fiber drawing, reducing fuzz formation, and it is also well miscible with the coupling agent, increasing the stability of the sizing agent. Insufficient bulking agent will directly affect the glass fiber expansion effect; excessive bulking agent will not improve the glass fiber expansion effect but will instead lead to waste and increased production costs. Furthermore, excessive bulking agent can easily adhere to the nozzle of the expansion machine, affecting the smoothness of subsequent glass fiber use and the expansion effect. Therefore, the percentage of the solid mass of the bulking agent in the solid mass of the sizing agent in this application is 2% to 9%, preferably 3% to 7%, and more preferably 4% to 6%.

[0027] In this application, the dispersant is a crucial component. Glass fiber sizing agents are highly complex mixtures; the aggregation or even precipitation of multiple components can negatively impact the smoothness of subsequent fiber drawing and the uniformity of sizing agent coating. The addition of a dispersant serves two purposes: ① promoting uniform dispersion and preventing precipitation and aggregation; ② reducing the surface tension of the glass fiber, promoting complete coating between the sizing agent and the glass fiber interface, and improving the dispersibility of the glass fiber. Preferably, the dispersant used in this application is an amine salt cationic dispersant. Because a certain amount of negative charge is generated during glass fiber production, the cationic dispersant can neutralize this negative charge, preventing yarn adhesion caused by electrostatic effects and ensuring yarn dispersibility and smooth application. The dosage of the dispersant is critical. Insufficient dosage will lead to aggregation and sedimentation of the sizing agent over time, resulting in uneven coating and affecting the performance of the subsequent glass fiber. Excessive dosage will increase the hydrophilicity of the sizing agent, reducing the coating effect of the resin particles. Furthermore, excessive dispersant, once saturated, becomes wasteful, increasing production costs. Therefore, the percentage of the solid mass of the dispersant in this application to the solid mass of the wetting agent is 10% to 26%, preferably 12% to 23%, and more preferably 14% to 21%.

[0028] In this application, the pH adjuster enables the coupling agent to disperse more effectively and quickly in water, while simultaneously adjusting the pH of the prepared wetting agent to a range of 3 to 6. In this application, the pH adjuster is acetic acid and / or citric acid, and its solid mass accounts for 1% to 6% of the solid mass of the wetting agent, preferably 1.5% to 5%, and more preferably 2% to 4%.

[0029] The glass fiber sizing agent of this application introduces coupling agent A and coupling agent B, which work synergistically to effectively protect the glass fiber. The synergistic use of the two film-forming agents ensures the stiffness, dispersibility, and flexibility of the yarn, while also improving the yarn's bulking effect. The use of a lubricant ensures smooth operation during glass fiber production and use. The use of a bulking agent ensures the bulking effect and fluffiness of the glass fiber. The use of a dispersant ensures the stability of the sizing agent and also improves the dispersibility of the glass fiber. By rationally proportioning silane coupling agent, film-forming agent, lubricant, dispersant, pH adjuster, and water, the glass fiber coated with this sizing agent exhibits moderate yarn stiffness, easy dispersion, good smoothness of use, and good impact resistance. It can well meet the requirements of the bulking production process, and the silencers produced with this sizing agent outperform conventional products.

[0030] According to another aspect of this application, a method for preparing the above-mentioned glass fiber impregnating agent is provided, comprising the following steps:

[0031] 1S. Preparation of silane coupling agent mixed solution: Take water with a mass of 30-40 times the total mass of silane coupling agent A and silane coupling agent B, add pH adjuster, stir for 5-10 min to obtain an aqueous solution with a pH value of 3-6; add silane coupling agent A and silane coupling agent B to the aqueous solution in sequence, stir for 30-40 min to obtain silane coupling agent mixed solution;

[0032] 2S. Dilution of film-forming agents, lubricants, leavening agents, and dispersants: Dissolve film-forming agent A in 6-8 times its mass of water by stirring to obtain a dissolved film-forming agent A emulsion; dilute film-forming agent B in 2-4 times its mass of water by stirring to obtain a diluted film-forming agent B emulsion; dilute lubricant in 3-8 times its mass of water by stirring to obtain a diluted lubricant aqueous solution, wherein the water temperature is 40-50℃; dilute leavening agent in 4-7 times its mass of water by stirring to obtain a diluted leavening agent aqueous solution, wherein the water temperature is 35-50℃; dilute dispersant in 5-10 times its mass of water by stirring to obtain a diluted dispersant aqueous solution, wherein the water temperature is 50-65℃.

[0033] 3S. Preparation of sizing agent: The diluted film-forming agent A emulsion, film-forming agent B emulsion, lubricant aqueous solution, bulking agent aqueous solution, and dispersant aqueous solution obtained in step 2S are added to the silane coupling agent mixed solution obtained in step 1S. The water in the sizing agent formula is replenished, and the mixture is stirred for 25-40 minutes to obtain the glass fiber sizing agent.

[0034] According to a third aspect of this application, glass fibers produced by coating the aforementioned glass fiber bulk yarn with a sizing agent are provided.

[0035] According to the fourth aspect of this application, the above-mentioned glass fiber bulk yarn impregnating agent is provided for use in automotive mufflers.

[0036] Compared with the prior art, the beneficial effects of this application are reflected in:

[0037] 1. This application uses a combination of silane coupling agents and studies a suitable content ratio, which can effectively protect glass fibers.

[0038] 2. This application studies the combination of film-forming agents in the sizing agent formulation. Polyolefin maleic anhydride copolymer and polyurethane modified epoxy resin emulsion are used in a certain ratio. The synergistic use of the two film-forming agents can make the glass fiber yarn have a suitable hardness, which is more conducive to drawing and forming. Secondly, it can spread out naturally during use, ensuring the swelling effect.

[0039] 3. This application innovatively adds a leavening agent and uses it in the impregnating agent in a certain proportion, so that the glass fiber has a better swelling effect and fluffiness during the expansion process. Detailed Implementation

[0040] 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.

[0041] The glass fiber sizing agent of this application includes a silane coupling agent, a lubricant, a film-forming agent, and a pH adjuster; wherein, the non-aqueous portion of the sizing agent accounts for 3-5% of the total mass of the sizing agent, and the remainder is water; the percentage of the solid mass of each component to the solid mass of the sizing agent is expressed as follows:

[0042]

[0043] Preferably, the percentage of the solid mass of each component relative to the solid mass of the wetting agent is expressed as follows:

[0044]

[0045]

[0046] More preferably, the percentage of the solid mass of each component to the solid mass of the wetting agent is expressed as follows:

[0047]

[0048] Preferably, silane coupling agent A is an aminosilane coupling agent, and silane coupling agent B is an epoxysilane coupling agent, with a mass ratio of 1:0.5 to 1:2; film-forming agent A is a polyolefin maleic anhydride copolymer with a molecular weight of 3000-8000, and film-forming agent B is a polyurethane modified epoxy emulsion with an epoxy equivalent of 220-350 g / eq, with a mass ratio of 1:1.5 to 1:4; the lubricant is a random polyether lubricant; the leavening agent is an epoxy polysiloxane; the dispersant is a cationic dispersant; the pH adjuster is acetic acid and / or citric acid; and the pH value of the wetting agent is 3-6.

[0049] The preparation method of this glass fiber impregnating agent includes the following steps:

[0050] 1S. Preparation of silane coupling agent mixed solution: Take water with a mass of 30-40 times the total mass of silane coupling agent A and silane coupling agent B, add pH adjuster, stir for 5-10 min to obtain an aqueous solution with a pH value of 3-6; add silane coupling agent A and silane coupling agent B to the aqueous solution in sequence, stir for 30-40 min to obtain silane coupling agent mixed solution;

[0051] 2S. Dilution of film-forming agents, lubricants, leavening agents, and dispersants: Dissolve film-forming agent A in 6-8 times its mass of water by stirring to obtain a dissolved film-forming agent A emulsion; dilute film-forming agent B in 2-4 times its mass of water by stirring to obtain a diluted film-forming agent B emulsion; dilute lubricant in 3-8 times its mass of water by stirring to obtain a diluted lubricant aqueous solution, wherein the water temperature is 40-50℃; dilute leavening agent in 4-7 times its mass of water by stirring to obtain a diluted leavening agent aqueous solution, wherein the water temperature is 35-50℃; dilute dispersant in 5-10 times its mass of water by stirring to obtain a diluted dispersant aqueous solution, wherein the water temperature is 50-65℃.

[0052] 3S. Preparation of the sizing agent: The diluted film-forming agent A emulsion, film-forming agent B emulsion, lubricant aqueous solution and dispersant aqueous solution obtained in step 2S are added to the silane coupling agent mixed solution obtained in step 1S, and the water in the sizing agent formula is replenished. The mixture is stirred for 25 to 40 minutes to obtain the glass fiber sizing agent.

[0053] The following are some specific embodiments of the glass fiber impregnating agent of this application.

[0054] Example

[0055] It should be noted that Table 1 provides specific embodiments of the sizing agent for glass fiber in this application. In the formulation, the amount of each component is the percentage of its solid mass to the total solid mass of the sizing agent.

[0056] It should be noted that the specific types, contents, and composition of the components selected in Table 1 do not limit the scope of protection of the application.

[0057] Table 1 List of specific embodiments of the wetting agent

[0058] Components Example 1 Example 2 Example 3 Example 4 Example 5 Silane Coupling Agent A 1 2 3 5 5 Silane coupling agent B 2 3 3 6 7 Film-forming agent A 22 20 17 15 15 Film-forming agent B 35 37 40 42 45 lubricant 9 8 7 6 5 leavening agent 2 2 4 6 5 dispersant 26 23 21 16 15 pH adjuster 3 5 5 4 3 Total 100 100 100 100 100 Solid content 4.0 4.0 4.0 4.0 4.0

[0059] Table 1 (continued) List of specific examples of wetting agents

[0060]

[0061]

[0062] To better illustrate the present invention, the following embodiments are further provided. The following embodiments specify the specific product brand of each component. It should be noted that the following description is for explaining the present invention and not for limiting the scope of the present invention in any way.

[0063] Example A

[0064] The solid content of the wetting agent is 4.0%, and the percentage of the solid mass of each component to the total solid mass of the wetting agent is expressed as follows:

[0065]

[0066] Example B

[0067] The solid content of the wetting agent is 4.0%, and the percentage of the solid mass of each component to the total solid mass of the wetting agent is expressed as follows:

[0068]

[0069]

[0070] Comparative Example

[0071] To further demonstrate the beneficial effects of this application, existing sizing agent formulations for bulky yarns and sizing agent formulations with different ratios were selected as comparative examples. The specific comparative formulations and test results are as follows. In each comparative formulation, the content represents the percentage of the solid mass of each component relative to the total solid mass of the sizing agent.

[0072] Comparative Example 1:

[0073] The solid content of the wetting agent is 4.0%, and the percentage of solid mass of each component to the total solid mass of the wetting agent is expressed as follows:

[0074] Coupling agent: silane coupling agent, γ-methacryloyloxypropyltrimethoxysilane, product brand A174, 8%;

[0075] Lubricant: Silicone oil, 9%;

[0076] Film-forming agent A: Epoxy resin emulsion, product brand DSM J129 (DSM), 55%;

[0077] Film-forming agent B: Polypropylene emulsion, product brand Michem Emulsion 42035A, 19%; Cationic surfactant: Octadecyltrimethylammonium chloride, organic quaternary ammonium salt 1831, 4.5%.

[0078] pH adjuster: Acetic acid, 3.5%.

[0079] The preparation method of Comparative Example 1 includes the following steps:

[0080] (1) Add 30% to 40% of the total amount of water to a container equipped with a variable speed stirrer, and add pH adjuster and silane coupling agent in sequence, stirring until the solution is clear;

[0081] (2) Dilute film-forming agent A and film-forming agent B with water and add them to a container, wherein the mass of water is 3 to 6 times that of the film-forming agent;

[0082] (3) Dilute the lubricant with water and add it to the container, where the mass of water is 5 to 10 times that of the lubricant;

[0083] (4) Dilute the surfactant with water and add it to the container, where the mass of water is 5 to 10 times that of the surfactant;

[0084] (5) Finally, add the remaining water to the container, stir well, and the finished product is obtained.

[0085] Comparative Example 2:

[0086] The solid content of the wetting agent is 4.3%, and the percentage of solid mass of each component to the total solid mass of the wetting agent is expressed as follows:

[0087] Coupling agent: silane coupling agent, γ-methacryloyloxypropyltrimethoxysilane, product brand A174, 11%;

[0088] Film-forming agent: epoxy resin emulsion, product brand JS129 (DSM), 65%;

[0089] Lubricant: PEG-based lubricant, TX-507, 13%;

[0090] Cationic surfactant: Organic quaternary ammonium salt, TX-E10, 6%;

[0091] pH adjuster: Acetic acid, 5%.

[0092] The preparation method of Comparative Example 2 includes the following steps:

[0093] (1) Add 30% to 40% of the total amount of water to a container equipped with a variable speed stirrer, and add pH adjuster and silane coupling agent in sequence, stirring until the solution is clear;

[0094] (2) Dilute film-forming agent A and film-forming agent B with water and add them to a container, wherein the mass of water is 3 to 6 times that of the film-forming agent;

[0095] (3) Dilute the lubricant with water and add it to the container, where the mass of water is 5 to 10 times that of the lubricant;

[0096] (4) Dilute the surfactant with water and add it to the container, where the mass of water is 5 to 10 times that of the surfactant;

[0097] (5) Finally, add the remaining water to the container, stir well, and the finished product is obtained.

[0098] Fiber forming: The prepared sizing agents (Examples 1-10, Example A, Example B, and Comparative Examples 1-2) were coated onto the glass fiber bulked yarn product, and the bulking performance of the glass fiber was tested. The glass fiber was drawn using a 4000H platinum spinneret, with a linear density of 4800 tex and a single fiber diameter of 24 micrometers. The drying process could employ tunnel hot air drying or microwave-assisted drying, with a drying time of 14.5 hours, yielding dried glass fiber yarn balls. The final product had a combustible content of 0.30 ± 0.15%.

[0099] Expansion: The glass fiber yarn is sequentially passed through a first winding wheel, a high-pressure compressed air nozzle, a second winding wheel, and a winding device. The first winding wheel is controlled to rotate at 200 m / min, the compressed air pressure from the high-pressure nozzle is 0.6 MPa, and the second winding wheel rotates at 170 m / min. Finally, the expanded yarn is wound by the winding and winding device to form expanded glass fiber yarn.

[0100] Table 2 Performance test results of the examples and comparative examples

[0101]

[0102] Table 2 (continued) Performance test results of examples and comparative examples

[0103]

[0104]

[0105] Note: (1) All data are based on 4800tex yarn tests; (2) Expansion rate = (size after expansion - size before expansion) / size before expansion * 100%.

[0106] As can be seen from the above examples, by rationally designing the components and their contents, we can obtain a suitable sizing agent. Compared with Comparative Examples 1-2, the glass fibers prepared using Examples 1-10 and Examples A and B of this application all have an expansion rate of over 4%, exhibiting good expansion effects. This indicates that adding a bulking agent results in better expansion effects and bulkiness of the glass fibers during the expansion process. In particular, the glass fibers prepared in Examples 4 and 5 have less fuzz, moderate yarn stiffness, and are very loose after tensioning, exhibiting high expansion rates and good expansion effects.

[0107] In summary, glass fibers produced using the glass fiber impregnating agent of this application not only have less hairiness, moderate yarn stiffness, and are easy to disperse, but also have a very good swelling effect, meeting the requirements of silencers.

[0108] 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.

[0109] 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 bulking yarn sizing agent characterized by, The silane coupling agent A, the silane coupling agent B, the film forming agent A, the film forming agent B, the lubricant, the dispersant, the bulk agent and the pH value regulator are included; wherein the solid content of the infiltrating agent accounts for 3-5%, and the balance is water; the solid mass percentage of each component in the solid mass of the infiltrating agent is shown as follows: Silane coupling agent A 1-7% Silane coupling agent B 2-11% Film forming agent A 8-23% Film forming agent B 34-52% Lubricant 2-9% Bulk agent 2-9% Dispersant 10-26% pH value regulator 1-6%; The bulk agent is an epoxy polysiloxane; The silane coupling agent A is an amino silane coupling agent, and the silane coupling agent B is an epoxy silane coupling agent; the mass ratio of the silane coupling agent A to the silane coupling agent B is 1:0.5-1:2; The film forming agent A is a polyolefin maleic anhydride copolymer with a molecular weight of 3000-8000; and the film forming agent B is a polyurethane modified epoxy resin emulsion with an epoxy equivalent of 220-350 g / eq.

2. The glass fiber bulking yarn sizing agent of claim 1, wherein, The solid mass percentage of each component in the solid mass of the infiltrating agent is shown as follows: Silane coupling agent A 2-6% Silane coupling agent B 4-9% Film forming agent A 10-20% Film forming agent B 37-50% Lubricant 4-7% Bulk agent 3-7% Dispersant 12-23% pH value regulator 1.5-5%.

3. The glass fiber bulking yarn sizing agent of claim 1, wherein The mass ratio of the film forming agent A to the film forming agent B is 1:1.5-1:

4.

4. The glass fiber bulked yarn infiltrating agent of claim 1, wherein, The lubricant is a random polyether lubricant; The dispersant is an amine salt cationic dispersant; The pH value regulator is acetic acid and / or citric acid.

5. The glass fiber bulking yarn sizing agent of claim 1, wherein, The solid mass percentage of each component in the solid mass of the infiltrating agent is shown as follows: Silane coupling agent A 3-5% Silane coupling agent B 5-8% Film forming agent A 12-18% Film forming agent B 40-47% Lubricant 5-6% Bulk agent 4-6% Dispersant 14-21% pH value regulator 2-4% The lubricant is a random polyether lubricant; The dispersant is an amine salt cationic dispersant; The pH value regulator is acetic acid and / or citric acid.

6. A process for preparing a glass fiber bulked yarn sizing agent as claimed in any one of claims 1 to 5, characterized in that, The steps include: 1S, preparation of a silane coupling agent mixed solution: taking water with a mass of 30-40 times the total mass of the silane coupling agent A and the silane coupling agent B, adding a pH value regulator, stirring for 5-10 min to obtain an aqueous solution with a pH value of 3-6; sequentially adding the silane coupling agent A and the silane coupling agent B to the aqueous solution, and stirring for 30-40 min to obtain a silane coupling agent mixed solution; 2S, dilution of film forming agent, lubricant, bulk agent and dispersant: the film forming agent A is dissolved by stirring with 6-8 times its mass of water to obtain a dissolved film forming agent A emulsion; the film forming agent B is diluted by stirring with 2-4 times its mass of water to obtain a diluted film forming agent B emulsion; the lubricant is diluted by stirring with 3-8 times its mass of water to obtain a diluted lubricant aqueous solution, wherein the water temperature is 40-50℃; the bulk agent is diluted by stirring with 4-7 times its mass of water to obtain a diluted bulk agent aqueous solution, wherein the water temperature is 35-50℃; the dispersant is diluted by stirring with 5-10 times its mass of water to obtain a diluted dispersant aqueous solution, wherein the water temperature is 50-65℃; 3S, preparation of the infiltrant: the diluted film forming agent A emulsion, film forming agent B emulsion, lubricant aqueous solution, bulk agent aqueous solution and dispersant aqueous solution prepared in step 2S are added to the silane coupling agent mixed solution prepared in step 1S to make up the water in the infiltrant formula, and stirred for 25-40 min to obtain the glass fiber infiltrant.

7. A glass fiber produced by coating with the glass fiber bulk yarn infiltrant as claimed in any one of claims 1-5.

8. Use of the glass fiber bulk yarn infiltrant as claimed in any one of claims 1-5 in automobile silencers.

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