An ultra-thin electronic glass fiber cloth and a preparation process thereof

Abstract

This invention discloses an ultrathin electronic glass fiber cloth and its preparation process, relating to the field of electronic glass fiber technology. The process includes the following steps: Step 1: A glass fiber matrix is ​​immersed in a pretreatment solution containing an aluminum coupling agent and an amino coupling agent to obtain a pretreated glass fiber cloth; Step 2: A catalytic solution, an epoxy-modified aerogel dispersion, and an amino-modified silica nanoparticle dispersion are sequentially sprayed onto the surface of the pretreated glass fiber cloth. The cloth is then subjected to constant humidity treatment at 80-85°C and 30-50% humidity, followed by drying to obtain the ultrathin electronic glass fiber cloth. The ultrathin electronic glass fiber cloth prepared in this application, when used to fabricate copper-clad laminates, exhibits excellent dielectric properties, improved compatibility with resin solutions, and enhanced interfacial bonding, further improving product reliability.

Description

Technical Field

[0001] This invention relates to the field of electronic glass fiber technology, specifically to an ultra-thin electronic glass fiber cloth and its preparation process. Background Technology

[0002] Electronic glass fiber cloth is made from ultra-fine glass fibers through weaving, surface treatment and other processes. It has high strength and high chemical resistance and is widely used in the production of copper clad laminates, printed circuit boards and other products. Its performance directly affects the performance of the final product.

[0003] As people's requirements for electronic devices have gradually evolved from thinness, lightness, and small size, ultra-thin electronic glass fiber cloth has gradually come into the public eye. However, under high-frequency signals, due to the insufficient dielectric properties of ultra-thin electronic glass fiber cloth and its poor bonding with resin, the long-term stability and reliability of products made from ultra-thin electronic glass fiber cloth decrease after long-term operation.

[0004] In summary, the preparation of an ultrathin electronic glass fiber cloth and its preparation process are of great significance in order to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an ultrathin electronic glass fiber cloth and its preparation process to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A process for preparing an ultrathin electronic glass fiber cloth, characterized by comprising the following steps: Step 1: The glass fiber matrix is ​​immersed in a pretreatment solution containing aluminum coupling agent and amino coupling agent to obtain pretreated glass fiber cloth. Step 2: The catalytic solution, epoxy-modified aerogel dispersion, and amino-modified silica nanoparticle dispersion are sequentially sprayed onto the surface of the pretreated glass fiber cloth. The cloth is then subjected to constant humidity treatment at 80-85℃ and 30-50% humidity, followed by drying to obtain an ultrathin electronic glass fiber cloth.

[0007] In a further embodiment, the raw material for the glass fiber base fabric is 106 electronic-grade glass fiber cloth with a thickness of 0.030 mm. The glass fiber base fabric is obtained by treating it in a hot water splitting bath, with the hot water temperature controlled at 80~95℃ and the soaking time at 3~10 seconds. Through the hot water splitting treatment, most of the sizing agent and impregnating agent on the surface of the fabric can be effectively removed. At the same time, it can eliminate fabric creases generated during weaving and winding, resulting in a smooth and uniform glass fiber base fabric.

[0008] More optimally, the pretreatment solution includes an aluminum coupling agent (aluminate coupling agent XY-AL81) and an amino coupling agent (KH-550) in a mass ratio of (1~2):5.

[0009] In a further embodiment, the raw materials of the pretreatment liquid include the following components: by mass, 1.5 to 2.5 parts of pretreatment agent, 0.1 to 0.3 parts of acetic acid, 0.01 to 0.02 parts of defoamer (defoamer SS-013A), and 90 to 95 parts of deionized water.

[0010] In a more optimized manner, the catalytic solution comprises triethylamine and AIBN (azobisisobutyronitrile) in a mass ratio of (0.1~0.5):(0.01~0.03), and the solvent is an aqueous ethanol solution; the concentration of the catalytic solution is 0.2~0.4%, and the coating amount is 2~4 g / m².

[0011] A more optimized method for preparing the epoxy-modified aerogel dispersion is as follows: Step 1: Add methyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and vinyltrimethoxysilane in a mass ratio of 2:1:(2~4.5) to an aqueous methanol solution, adjust the pH to 3.5~4.0 with acetic acid, and react for 3~4 h; adjust the pH to 9.0~10.0 with ammonia; then soak in an aqueous ethanol solution of 25~35wt% methyltrimethoxysilane, age for 10~12 h, and dry to obtain epoxy aerogel; Step 2: The epoxy-based aerogel and the epoxy-containing sulfide compound are ultrasonically dispersed in an ethanol aqueous solution to obtain an epoxy-modified aerogel dispersion.

[0012] In a more optimized manner, the solid content of the epoxy-modified aerogel dispersion is 7-11%; and the mass ratio of epoxy-based aerogel to epoxy-containing sulfide compound in the raw materials of the epoxy-modified aerogel dispersion is (6-10):1.

[0013] A more optimized method for preparing epoxy-containing sulfide compounds is as follows: Step 1: Add 4-(trifluoromethyl)thiophenol, triethylamine, and pentaerythritol glycidyl ether to methanol and react at room temperature for 1-4 hours. Then purify and dry to obtain a thioether compound containing trifluoromethyl. Step 2: Add 11-mercaptoundecylphosphonic acid, triethylamine, and a trifluoromethyl-containing sulfide compound to methanol, react at room temperature for 5-12 hours, purify and dry; to obtain an epoxy-containing sulfide compound.

[0014] More preferably, in the raw material containing the trifluoromethyl sulfide compound, the molar ratio of 4-(trifluoromethyl)benzylthiophenol, triethylamine, and pentaerythritol glycidyl ether is (0.9~1):(0.9~1):1; and in the raw material containing the epoxy group sulfide compound, the mass ratio of 11-mercaptoundecylphosphonic acid, triethylamine, and the trifluoromethyl sulfide compound is 1:(0.18~0.20):(1.7~2.1).

[0015] In a more optimized manner, the solid content of the amino-modified silica nanoparticle dispersion is 8-15%; the raw materials of the amino-modified silica nanoparticle dispersion include amino-modified silica nanoparticles and thiol-modified silica nanoparticles in a mass ratio of (2-3):(1-2). The raw materials for the amino-modified silica nanoparticles include aminosilane and mesoporous silica in a mass ratio of (0.1~0.3):2; the raw materials for the mercapto-modified silica nanoparticles include mercaptosilane and mesoporous silica in a mass ratio of (0.2~0.5):2; the particle size of the mesoporous silica is 50~100nm.

[0016] More optimally, the coating amount of the epoxy-modified aerogel dispersion is 8~16 g / m²; the coating amount of the amino-modified silica nanoparticle dispersion is 8~14 g / m².

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present application uses glass fiber base cloth as raw material. After pretreatment with a pretreatment liquid, a catalytic solution, an epoxy modified aerogel dispersion, and an amino modified silica nanoparticle dispersion are sprayed on it respectively. While introducing specific low dielectric fillers, it is double-cured. By spraying the dispersions separately, a dense structure is formed, which enhances the bonding force with the resin, which is conducive to further improving dielectric properties and improving product reliability.

[0018] (1) This application uses pentaerythritol glycidyl ether as the core, and prepares epoxy-containing sulfide compounds with 4-(trifluoromethyl)benzenethiophenol and 11-mercaptoundecyl phosphoric acid through a thiol-epoxy ring-opening reaction. These compounds are then combined with epoxy-modified aerogels through physical mixing to form an epoxy-modified aerogel dispersion. Epoxy-containing sulfide compounds can promote cross-linking, which is beneficial to improving structural stability. At the same time, the branched structure can increase the intramolecular free volume, which helps to reduce the dielectric constant. The low polarity of trifluoromethyl groups can reduce the polarizability and further improve the dielectric properties. The long aliphatic chains in undecyl phosphoric acid provide hydrophobicity, preventing the aerogel from absorbing moisture and reducing its performance in the dispersion.

[0019] (2) This application can improve the interfacial bonding force with the resin. First, the epoxy-modified aerogel dispersion contains phosphate groups, which can synergize with the aluminum coupling agent (aluminum element) in the pretreatment solution, thereby improving the interfacial bonding force between the epoxy-modified aerogel dispersion and the pretreated glass fiber cloth. Second, the epoxy-modified aerogel dispersion reacts with the amino groups in the pretreatment solution and cures, further improving the bonding force. Most importantly, the epoxy-modified aerogel dispersion is first sprayed to roughen its surface; then, an amino-modified silica nanoparticle dispersion is sprayed to introduce mesoporous silica of a specific size, so that the surface of the aerogel layer is covered with mesoporous silica. While basically retaining the low dielectric properties of the aerogel, the interface is made smoother. At the same time, the internal pores of the mesoporous silica can provide a high specific surface area, which is beneficial to increasing the contact area with the subsequent resin adhesive. In addition, the nanoparticles on the surface contain active groups, which can chemically bond with the polar functional groups in the resin, thereby improving the interfacial bonding force between the aerogel and the resin.

[0020] (3) In this application, the epoxy-modified aerogel dispersion and the amino-modified silica nanoparticle dispersion play specific roles: The amino-modified silica nanoparticle dispersion contains active groups such as amino and thiol groups, which can react with active groups such as epoxy and vinyl groups in the epoxy-modified aerogel dispersion to further improve dispersibility and structural stability. At the same time, the silica nanoparticles of a specific size and the epoxy-modified aerogel play a specific synergistic role. Compared with single epoxy-modified aerogel or amino-modified silica nanoparticles, the rigid silica nanoparticles of a specific size and amount are distributed between the brittle aerogel network, which improves structural stability and helps to suppress the shrinkage and cracking of the aerogel. At the same time, the aerogel and nanoparticles help to reduce polarity, and the two have similar chemical structures, resulting in less interfacial polarization loss, thereby further improving dielectric properties. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The following embodiments are specifically noted: Amino-modified silica nanoparticles: aminosilane (KH-550) and mesoporous silica (particle size 50nm) were added to an 80wt% ethanol aqueous solution at a mass ratio of 0.2:2, reacted at 65℃ for 4h, cooled to room temperature, and dried to obtain amino-modified silica nanoparticles. Thiol-modified silica nanoparticles: Thiol-silane (KH-580) and mesoporous silica (particle size 50 nm) were added to an 80 wt% ethanol aqueous solution at a mass ratio of 0.35:2, reacted at 65℃ for 4 h, cooled to room temperature, and dried to obtain thiol-modified silica nanoparticles. Example 1: A process for preparing an ultrathin electronic glass fiber cloth, comprising the following steps: Pre-preparation: The preparation method of epoxy-containing sulfide compounds is as follows: (1) 4-(trifluoromethyl)benzylthiophenol, triethylamine, and pentaerythritol glycidyl ether in a molar ratio of 0.95:0.95:1 are added to methanol and reacted at room temperature for 3 h, then purified and dried to obtain a trifluoromethyl-containing sulfide compound; (2) 11-mercaptoundecyl phosphate, triethylamine, and trifluoromethyl-containing sulfide compound in a mass ratio of 1:0.19:1.89 are added to methanol and reacted at room temperature for 8 h, then purified and dried to obtain an epoxy-containing sulfide compound; Preparation method of epoxy modified aerogel dispersion: (1) Methyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane and vinyltrimethoxysilane in a mass ratio of 2:1:3.2 were added to a 75wt% methanol aqueous solution, acetic acid was added to adjust the pH to 3.8, and the reaction was carried out for 3.5h; 1M ammonia was added to adjust the pH to 9.5; then it was soaked in a 30wt% methyltrimethoxysilane ethanol aqueous solution (ethanol to deionized water volume ratio of 7:3) and aged for 11h. After being taken out, it was dried at 60℃ and normal pressure for 12h to obtain epoxy aerogel. (2) An epoxy-modified aerogel dispersion was obtained by ultrasonically dispersing an epoxy-containing aerogel and an epoxy-containing sulfide compound in a mass ratio of 8:1 in a 75wt% ethanol aqueous solution. Step 1: The glass fiber base cloth (the raw material is 106 electronic grade glass fiber cloth with a thickness of 0.030 mm, which is obtained by treating it in a hot water fiber opening tank, wherein the hot water temperature is controlled at 87℃ and the soaking time is 6s) is placed in a pretreatment solution containing aluminum coupling agent and amino coupling agent (by mass, 2.0 parts of pretreatment agent (including aluminum coupling agent and amino coupling agent with a mass ratio of 1.5:5), 0.2 parts of acetic acid, 0.015 parts of defoamer, and 92 parts of deionized water), and soaked at room temperature for 15 minutes. After soaking, it is taken out and dried to obtain the pretreated glass fiber cloth. Step 2: The surface of the pretreated glass fiber cloth is sequentially sprayed with a catalytic solution (the catalytic solution consists of triethylamine and AIBN in a mass ratio of 0.25:0.02, and the solvent is 75wt% ethanol aqueous solution; the concentration of the catalytic solution is 0.3%, and the coating amount is 3g / m²), an epoxy modified aerogel dispersion (solid content is 9%; coating amount is 12g / m²), and an amino-modified silica nanoparticle dispersion (the raw materials of the amino-modified silica nanoparticle dispersion include amino-modified silica nanoparticles and thiol-modified silica nanoparticles in a mass ratio of 2.5:1.5; solid content is 11.5%, solvent is 75wt% ethanol aqueous solution; coating amount is 11g / m²), and then treated with constant humidity at 80℃ and 30% humidity for 2 hours, followed by drying to obtain an ultrathin electronic glass fiber cloth.

[0023] Example 2: A preparation process for an ultrathin electronic glass fiber cloth, comprising the following steps: Pre-preparation: The preparation method of epoxy-containing sulfide compounds is as follows: (1) 4-(trifluoromethyl)benzylthiophenol, triethylamine, and pentaerythritol glycidyl ether in a molar ratio of 0.95:0.95:1 are added to methanol and reacted at room temperature for 3 h, then purified and dried to obtain a trifluoromethyl-containing sulfide compound; (2) 11-mercaptoundecyl phosphate, triethylamine, and trifluoromethyl-containing sulfide compound in a mass ratio of 1:0.19:1.89 are added to methanol and reacted at room temperature for 8 h, then purified and dried to obtain an epoxy-containing sulfide compound; Preparation method of epoxy modified aerogel dispersion: (1) Methyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane and vinyltrimethoxysilane in a mass ratio of 2:1:3.2 were added to a 75wt% methanol aqueous solution, acetic acid was added to adjust the pH to 3.8, and the reaction was carried out for 3.5h; 1M ammonia was added to adjust the pH to 9.5; then it was soaked in a 30wt% methyltrimethoxysilane ethanol aqueous solution (ethanol to deionized water volume ratio of 7:3) and aged for 11h. After being taken out, it was dried at 60℃ and normal pressure for 12h to obtain epoxy aerogel. (2) An epoxy-modified aerogel dispersion was obtained by ultrasonically dispersing an epoxy-containing aerogel and an epoxy-containing sulfide compound in a mass ratio of 8:1 in a 75wt% ethanol aqueous solution. Step 1: The glass fiber base cloth (the raw material is 106 electronic grade glass fiber cloth with a thickness of 0.030 mm, which is obtained by treating it in a hot water fiber opening tank, wherein the hot water temperature is controlled at 87℃ and the soaking time is 6s) is placed in a pretreatment solution containing aluminum coupling agent and amino coupling agent (by mass parts, 1.5 parts of pretreatment agent (including aluminum coupling agent and amino coupling agent with a mass ratio of 1.5:5), 0.2 parts of acetic acid, 0.015 parts of defoamer, and 92 parts of deionized water), and soaked at room temperature for 15 minutes. After soaking, it is taken out and dried to obtain the pretreated glass fiber cloth. Step 2: The surface of the pretreated glass fiber cloth is sequentially sprayed with a catalytic solution (the catalytic solution consists of triethylamine and AIBN in a mass ratio of 0.25:0.02, and the solvent is 75wt% ethanol aqueous solution; the concentration of the catalytic solution is 0.3%, and the coating amount is 3g / m²), an epoxy modified aerogel dispersion (solid content is 7.5%; coating amount is 11g / m²), and an amino-modified silica nanoparticle dispersion (the raw materials of the amino-modified silica nanoparticle dispersion include amino-modified silica nanoparticles and thiol-modified silica nanoparticles in a mass ratio of 2.5:1.5; solid content is 10%, solvent is 75wt% ethanol aqueous solution; coating amount is 10g / m²), and then treated with constant humidity at 80℃ and 30% humidity for 2 hours, followed by drying to obtain an ultrathin electronic glass fiber cloth.

[0024] Example 3: A process for preparing an ultrathin electronic glass fiber cloth, comprising the following steps: Pre-preparation: The preparation method of epoxy-containing sulfide compounds is as follows: (1) 4-(trifluoromethyl)benzylthiophenol, triethylamine, and pentaerythritol glycidyl ether in a molar ratio of 0.95:0.95:1 are added to methanol and reacted at room temperature for 3 h, then purified and dried to obtain a trifluoromethyl-containing sulfide compound; (2) 11-mercaptoundecyl phosphate, triethylamine, and trifluoromethyl-containing sulfide compound in a mass ratio of 1:0.19:1.89 are added to methanol and reacted at room temperature for 8 h, then purified and dried to obtain an epoxy-containing sulfide compound; Preparation method of epoxy modified aerogel dispersion: (1) Methyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane and vinyltrimethoxysilane in a mass ratio of 2:1:3.2 were added to a 75wt% methanol aqueous solution, acetic acid was added to adjust the pH to 3.8, and the reaction was carried out for 3.5h; 1M ammonia was added to adjust the pH to 9.5; then it was soaked in a 30wt% methyltrimethoxysilane ethanol aqueous solution (ethanol to deionized water volume ratio of 7:3) and aged for 11h. After being taken out, it was dried at 60℃ and normal pressure for 12h to obtain epoxy aerogel. (2) An epoxy-modified aerogel dispersion was obtained by ultrasonically dispersing an epoxy-containing aerogel and an epoxy-containing sulfide compound in a mass ratio of 8:1 in a 75wt% ethanol aqueous solution. Step 1: The glass fiber base cloth (the raw material is 106 electronic grade glass fiber cloth with a thickness of 0.030 mm, which is obtained by treating it in a hot water fiber opening tank, wherein the hot water temperature is controlled at 87℃ and the soaking time is 6s) is placed in a pretreatment solution containing aluminum coupling agent and amino coupling agent (by mass, 2.5 parts of pretreatment agent (including aluminum coupling agent and amino coupling agent with a mass ratio of 1.5:5), 0.2 parts of acetic acid, 0.015 parts of defoamer, and 92 parts of deionized water), and soaked at room temperature for 15 minutes. After soaking, it is taken out and dried to obtain the pretreated glass fiber cloth. Step 2: The surface of the pretreated glass fiber cloth is sequentially sprayed with a catalytic solution (the catalytic solution consists of triethylamine and AIBN in a mass ratio of 0.25:0.02, and the solvent is 75wt% ethanol aqueous solution; the concentration of the catalytic solution is 0.3%, and the coating amount is 3g / m²), an epoxy modified aerogel dispersion (solid content is 10.5%; coating amount is 13g / m²), and an amino-modified silica nanoparticle dispersion (the raw materials of the amino-modified silica nanoparticle dispersion include amino-modified silica nanoparticles and thiol-modified silica nanoparticles in a mass ratio of 2.5:1.5; solid content is 13%, solvent is 75wt% ethanol aqueous solution; coating amount is 12g / m²), and then treated with constant humidity at 80℃ and 30% humidity for 2 hours, followed by drying to obtain an ultrathin electronic glass fiber cloth.

[0025] Comparative Example 1: Only a dispersion of single amino-modified silica nanoparticles was sprayed; the rest was the same as in Example 1.

[0026] Comparative Example 2: Only a single epoxy-modified aerogel dispersion was sprayed; the rest was the same as in Example 1.

[0027] Comparative Example 3: The pretreated glass fiber cloth was replaced with glass fiber base cloth (step 1 was omitted); the rest was the same as in Example 1.

[0028] Comparative Example 4: The pretreated glass fiber cloth was replaced with the ultrathin electronic glass fiber cloth (step 2 was omitted); the rest was the same as in Example 1.

[0029] Performance testing: The ultrathin electronic glass fiber cloths prepared in Examples 1-3 and Comparative Examples 1-4 were respectively used to prepare copper-clad laminates. The process was as follows: At 110℃, ultra-thin electronic glass fiber cloth is immersed in resin solution, the temperature is raised to 130℃ and held for 10 minutes, and then cooled to obtain a prepreg; using an HS360T-8-0 vacuum laminator, the prepreg is hot-pressed with copper foil (15μm thick), and then cooled to obtain a copper-clad laminate. The components of the above resin adhesive include, by weight, 15 parts epoxy resin (GELR-128), 75 parts phenolic resin (NPCN-704), 10 parts curing agent (DICY), and 0.6 parts accelerator (2-ethyl-4-methylimidazole).

[0030] Dielectric properties: The dielectric dispersion performance was tested using an LCR meter at a frequency of 1MHz, and the dielectric constant was calculated; specific data are shown in Table 1. Peel strength: The peel strength tester SG-305 was used, and the test was conducted according to the standard stamping method B in IPC-TM-650 2.4.9. The test conditions were: room temperature, test time of 24 hours, and humidity of 45~55°. The specific data are shown in Table 1. Table 1

[0031] Conclusion: As shown in Table 1 above, the ultrathin electronic glass fiber cloth prepared in this application exhibits strong adhesion to the resin adhesive and high dielectric properties when used to prepare copper-clad laminates. Comparative Example 1 shows that spraying only a single amino-modified silica nanoparticle dispersion without epoxy-modified aerogel results in decreased dielectric properties and a decline in overall performance due to the lack of epoxy, vinyl, and trifluoromethyl groups. Comparative Example 2 shows that spraying only a single epoxy-modified aerogel dispersion without dense filling leads to decreased adhesion. Comparative Example 3 shows that replacing the pretreated glass fiber cloth with a glass fiber base cloth (without step 1) without coupling agent pretreatment results in decreased adhesion to the protective layer and resin, leading to a decline in overall performance. Comparative Example 4 shows that replacing the ultrathin electronic glass fiber cloth with the pretreated glass fiber cloth (without step 2) without dielectric filler increases the dielectric constant, resulting in a decline in overall performance.

[0032] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A process for preparing an ultrathin electronic glass fiber cloth, characterized in that: Includes the following steps: Step 1: The glass fiber matrix is ​​immersed in a pretreatment solution containing aluminum coupling agent and amino coupling agent to obtain pretreated glass fiber cloth; Step 2: The catalytic solution, epoxy-modified aerogel dispersion, and amino-modified silica nanoparticle dispersion are sequentially sprayed onto the surface of the pretreated glass fiber cloth. The cloth is then subjected to constant humidity treatment at 80-85℃ and 30-50% humidity, and then dried to obtain an ultra-thin electronic glass fiber cloth. The preparation method of the epoxy-modified aerogel dispersion is as follows: methyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and vinyltrimethoxysilane are added to a methanol aqueous solution, the pH is adjusted, the aerogel is soaked in an ethanol aqueous solution of methyltrimethoxysilane, aged, and dried to obtain an epoxy-modified aerogel; the epoxy-modified aerogel is then dispersed with an epoxy-containing sulfide compound to obtain the epoxy-modified aerogel dispersion. The method for preparing the epoxy-containing sulfide compound is as follows: reacting 4-(trifluoromethyl)benzylthiophenol, triethylamine, and pentaerythritol glycidyl ether to obtain a trifluoromethyl-containing sulfide compound; then reacting it with 11-mercaptoundecyl phosphate and triethylamine to obtain an epoxy-containing sulfide compound.

2. The preparation process of an ultra-thin electronic glass fiber cloth according to claim 1, characterized in that: The pretreatment solution includes an aluminum coupling agent and an amino coupling agent in a mass ratio of (1~2):

5.

3. The preparation process of an ultrathin electronic glass fiber cloth according to claim 1, characterized in that: The catalytic solution comprises triethylamine and AIBN in a mass ratio of (0.1~0.5):(0.01~0.03), and the solvent is an aqueous ethanol solution; the concentration of the catalytic solution is 0.2~0.4%, and the coating amount is 2~4 g / m².

4. The preparation process of an ultrathin electronic glass fiber cloth according to claim 1, characterized in that: The preparation method of the epoxy-modified aerogel dispersion: Step 1: Add methyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and vinyltrimethoxysilane in a mass ratio of 2:1:(2~4.5) to an aqueous methanol solution, adjust the pH to 3.5~4.0 with acetic acid, and react for 3~4 h; adjust the pH to 9.0~10.0 with ammonia; then soak in an aqueous ethanol solution of 25~35wt% methyltrimethoxysilane, age for 10~12 h, and dry to obtain epoxy aerogel; Step 2: The epoxy-based aerogel and the epoxy-containing sulfide compound are ultrasonically dispersed in an ethanol aqueous solution to obtain an epoxy-modified aerogel dispersion.

5. The preparation process of an ultra-thin electronic glass fiber cloth according to claim 4, characterized in that: The solid content of the epoxy-modified aerogel dispersion is 7-11%; in the raw materials of the epoxy-modified aerogel dispersion, the mass ratio of epoxy-based aerogel to epoxy-containing sulfide compound is (6-10):

1.

6. The preparation process of an ultrathin electronic glass fiber cloth according to claim 4, characterized in that: The preparation method of epoxy-containing sulfide compounds is as follows: Step 1: Add 4-(trifluoromethyl)thiophenol, triethylamine, and pentaerythritol glycidyl ether to methanol and react at room temperature for 1-4 hours. Purify and dry to obtain a trifluoromethyl sulfide compound. Step 2: Add 11-mercaptoundecylphosphonic acid, triethylamine, and a trifluoromethyl-containing sulfide compound to methanol, react at room temperature for 5-12 hours, purify and dry; to obtain an epoxy-containing sulfide compound.

7. The preparation process of an ultrathin electronic glass fiber cloth according to claim 6, characterized in that: In the raw material containing the trifluoromethyl sulfide compound, the molar ratio of 4-(trifluoromethyl)benzylthiophenol, triethylamine, and pentaerythritol glycidyl ether is (0.9~1):(0.9~1):1; in the raw material containing the epoxy group sulfide compound, the mass ratio of 11-mercaptoundecyl phosphate, triethylamine, and the trifluoromethyl sulfide compound is 1:(0.18~0.20):(1.7~2.1).

8. The preparation process of an ultrathin electronic glass fiber cloth according to claim 1, characterized in that: The solid content of the amino-modified silica nanoparticle dispersion is 8-15%; the raw materials of the amino-modified silica nanoparticle dispersion include amino-modified silica nanoparticles and thiol-modified silica nanoparticles in a mass ratio of (2-3):(1-2). The raw materials for the amino-modified silica nanoparticles include aminosilane and mesoporous silica in a mass ratio of (0.1~0.3):2; the raw materials for the mercapto-modified silica nanoparticles include mercaptosilane and mesoporous silica in a mass ratio of (0.2~0.5):2; the particle size of the mesoporous silica is 50~100nm.

9. The preparation process of an ultra-thin electronic glass fiber cloth according to claim 1, characterized in that: The coating amount of the epoxy-modified aerogel dispersion is 8~16 g / m²; the coating amount of the amino-modified silica nanoparticle dispersion is 8~14 g / m².

10. The ultrathin electronic glass fiber cloth prepared by the preparation process of the ultrathin electronic glass fiber cloth according to any one of claims 1 to 9.

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