Glass fiber cloth and preparation method thereof

Abstract

The invention relates to the technical field of glass fiber cloth, and discloses glass fiber cloth which is prepared by twisting glass fiber monofilaments and carbon fiber monofilaments into mixed yarns, weaving the mixed yarns into a glass fiber fabric and then respectively dipping the glass fiber fabric into a resin binder added with filler and a silane solution, and also discloses a preparation method of the glass fiber cloth. Comprising the following steps: S1, twisting glass fiber monofilaments and carbon fiber monofilaments into mixed yarns, and weaving the mixed yarns into a glass fiber fabric; s2, adding a silane coupling agent into an acetone solvent; s3, adding a filler into the silane solution; s4, adding the modified filler into a resin binder to obtain a modified resin binder; s5, sequentially soaking the glass fiber fabric in a silane solution and a modified resin binder; s6, drying the glass fiber cloth, pressurizing and exhausting; and then curing is carried out. The glass fiber cloth prepared by the invention has excellent tensile property, bending property and impact property, and is good in wear resistance.

Description

Technical Field

[0001] The invention relates to the technical field of glass fiber cloth, in particular to a glass fiber cloth and a preparation method thereof. Background Art

[0002] Glass fiber cloth is mainly a fabric composed of glass fibers, which has the characteristics of insulation and heat insulation, as well as non-combustibility and high temperature resistance. It is usually used as a reinforcing material in composite materials, electrical insulation materials, thermal insulation materials and circuit substrates, and is used in various fields.

[0003] A Chinese patent discloses a glass fiber cloth and its preparation process (authorization announcement number CN115012219B). This patented technology significantly improves the comprehensive performance of the glass fiber cloth by controlling the components of the coupling agent and the plasticizer, and improves the bending mechanical properties and insulation of the glass fiber cloth. However, its tensile and impact resistance are poor, and its wear resistance is also poor. Summary of the invention

[0004] The object of the present invention is to provide a glass fiber cloth and a preparation method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A glass fiber cloth is prepared by twisting glass fiber monofilaments and carbon fiber monofilaments into mixed yarns, weaving them into glass fiber fabrics, and then respectively impregnating them into a resin binder and a silane solution with fillers added thereto.

[0006] A method for preparing a glass fiber cloth comprises the following steps: S1. 120 to 160 glass fiber monofilaments with a diameter of 5 to 8 um and 30 to 40 carbon fiber monofilaments with a diameter of 5 to 8 um are mixed and bundled, and then twisted into mixed yarn; according to the width and mesh distribution of the cloth, the glass fiber fabric is woven for standby use; S2, drying the silane coupling agent at 105-110°C for 3-4 hours; then adding the silane coupling agent to the acetone solvent in a mass ratio of (2-5):100 to prepare a silane solution for standby use; S3, adding the filler to the silane solution according to the mass ratio of (2-3):100, stirring evenly with a high-speed homogenizer, leaving at room temperature for 4-6 hours, and drying at 80-90° C. for 2-3 hours to obtain a modified filler; S4, adding the modified filler to the resin binder in a mass ratio of (5-8):100, and mixing evenly by ultrasonic mixing and magnetic stirring to obtain a modified resin binder; S5, first placing the glass fiber fabric obtained in step S1 in the silane solution obtained in step S2, soaking for 20 to 30 minutes, and then placing it in the modified resin binder obtained in step S3, soaking for 3 to 5 minutes, to obtain a glass fiber cloth; S6. Dry the glass fiber cloth at 50-55°C for 8-10 minutes; then, pressurize and exhaust at 100-105°C at a pressure of 0.6-0.7MPa; then, cure at 110-120°C for 1h, 140-150°C for 2h, and 170-180°C for 2h, and slowly cool to room temperature.

[0007] As a further solution of the present invention: in the step S1, the carbon fiber is prepared by oxidation and carbonization of polyacrylonitrile fiber, asphalt fiber and polytetrafluoroethylene fiber in a mass ratio of 3:3:1.

[0008] As a further solution of the present invention: in the step S2, the silane treating agent is one or more of diethylaminomethyltriethoxysilane, dichloromethyltriethoxysilane, polymethyltriethoxysilane and γ-aminopropylmethyldiethoxysilane.

[0009] As a further solution of the present invention: in the S3 step, the filler is composed of titanium dioxide powder, calcium carbonate powder, molybdenum disulfide powder, aluminum borate powder, potassium titanate powder and calcium sulfate powder in a mass ratio of (5-8):(5-8):(3-4):(1-2):(1-2):(1-2), wherein the particle size of the titanium dioxide powder is 10-20 nm, the particle size of the calcium carbonate powder is 30-50 nm, the particle size of the molybdenum disulfide powder is 2-3 um, the particle size of the aluminum borate powder is 0.3-1 um, the particle size of the potassium titanate powder is 0.5-1.5 um, and the particle size of the calcium sulfate powder is 1-2 um.

[0010] As a further solution of the present invention: in the step S4, the resin binder is one or more of bisphenol A cyanate ester, E-51 epoxy resin, phenolic resin and acetal resin.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The present invention first twists glass fiber monofilaments and carbon fiber monofilaments into mixed yarns, weaves them into glass fiber fabrics, then adds fillers into a silane solution for modification; then adds the modified fillers into a resin binder to modify the resin binder, then soaks the glass fiber fabric in the silane solution, and then impregnates it in the modified resin binder; finally, it is dried, pressurized, and cured to obtain glass fiber cloth; the glass fiber cloth prepared by the method has excellent tensile properties, bending properties, impact properties, and good wear resistance. DETAILED DESCRIPTION Example 1

[0012] In an embodiment of the present invention, a method for preparing a glass fiber cloth comprises the following steps: S1. Carbon fiber is prepared by oxidation and carbonization of polyacrylonitrile fiber, asphalt fiber and polytetrafluoroethylene fiber in a mass ratio of 3:3:1; 120 glass fiber monofilaments with a diameter of 8um and 30 carbon fiber monofilaments with a diameter of 8um are mixed and bundled, and then twisted into a mixed yarn; according to the width and mesh distribution of the cloth, a glass fiber fabric is woven for standby use; S2, drying diethylaminomethyltriethoxysilane at 105° C. for 3 h; then adding diethylaminomethyltriethoxysilane to acetone solvent at a mass ratio of 2:100 to prepare a silane solution for standby use; S3, according to a mass ratio of 2:100, titanium dioxide powder with a particle size of 10nm, calcium carbonate powder with a particle size of 30nm, molybdenum disulfide powder with a particle size of 2um, aluminum borate powder with a particle size of 0.3um, potassium titanate powder with a particle size of 0.5um and calcium sulfate powder with a particle size of 1um were mixed in a mass ratio of 5:5:3:1:1:1, added to the silane solution, and then stirred evenly with a high-speed homogenizer. After leaving at room temperature for 4h, it was dried at 90°C for 2h to obtain a modified filler; S4, adding the modified filler to bisphenol A cyanate at a mass ratio of 5:100, and mixing them evenly by ultrasonic mixing and magnetic stirring to obtain a modified resin binder; S5, first placing the glass fiber fabric obtained in step S1 in the silane solution obtained in step S2, soaking for 20 minutes, and then placing it in the modified resin binder obtained in step S3, soaking for 3 minutes, to obtain a glass fiber cloth; S6. Dry the glass fiber cloth at 50°C for 10 minutes; then, pressurize and exhaust at 100°C at a pressure of 0.7MPa; then cure at 110°C for 1h, 140°C for 2h, and 170°C for 2h, and slowly cool to room temperature. Example 2

[0013] In an embodiment of the present invention, a method for preparing a glass fiber cloth comprises the following steps: S1. Carbon fiber is prepared by oxidation and carbonization of polyacrylonitrile fiber, asphalt fiber and polytetrafluoroethylene fiber in a mass ratio of 3:3:1; 135 glass fiber monofilaments with a diameter of 7um and 35 carbon fiber monofilaments with a diameter of 7um are mixed and bundled, and then twisted into a mixed yarn; according to the width and mesh distribution of the cloth, a glass fiber fabric is woven for standby use; S2, drying dichloromethyltriethoxysilane at 108° C. for 3.5 h; then adding dichloromethyltriethoxysilane to acetone solvent at a mass ratio of 3:100 to prepare a silane solution for standby use; S3, according to a mass ratio of 3:100, titanium dioxide powder with a particle size of 15nm, calcium carbonate powder with a particle size of 40nm, molybdenum disulfide powder with a particle size of 2.5um, aluminum borate powder with a particle size of 0.6um, potassium titanate powder with a particle size of 1um and calcium sulfate powder with a particle size of 1.5um were mixed in a mass ratio of 6:6:3:1.5:1.5:1.5, added to the silane solution, and then stirred evenly with a high-speed homogenizer. After leaving at room temperature for 5h, it was dried at 85°C for 2.5h to obtain a modified filler; S4, adding the modified filler to E-51 epoxy resin at a mass ratio of 7:100, and mixing evenly by ultrasonic mixing and magnetic stirring to obtain a modified resin binder; S5, first placing the glass fiber fabric obtained in step S1 in the silane solution obtained in step S2, soaking for 25 minutes, and then placing it in the modified resin binder obtained in step S3, soaking for 4 minutes, to obtain a glass fiber cloth; S6. Dry the glass fiber cloth at 52°C for 9 minutes; then, pressurize and exhaust at 102°C at a pressure of 0.65MPa; then cure at 115°C for 1h, 145°C for 2h, and 175°C for 2h, and slowly cool to room temperature. Example 3

[0014] In an embodiment of the present invention, a method for preparing a glass fiber cloth comprises the following steps: S1. Carbon fiber is prepared by oxidation and carbonization of polyacrylonitrile fiber, asphalt fiber and polytetrafluoroethylene fiber in a mass ratio of 3:3:1; 160 glass fiber monofilaments with a diameter of 8um and 40 carbon fiber monofilaments with a diameter of 8um are mixed and bundled, and then twisted into a mixed yarn; according to the width and mesh distribution of the cloth, a glass fiber fabric is woven for standby use; S2, drying γ-aminopropylmethyldiethoxysilane at 110° C. for 4 h; then adding γ-aminopropylmethyldiethoxysilane to acetone solvent at a mass ratio of 5:100 to prepare a silane solution for standby use; S3, according to a mass ratio of 3:100, titanium dioxide powder with a particle size of 20nm, calcium carbonate powder with a particle size of 50nm, molybdenum disulfide powder with a particle size of 3um, aluminum borate powder with a particle size of 1um, potassium titanate powder with a particle size of 1.5um and calcium sulfate powder with a particle size of 2um were mixed in a mass ratio of 4:4:2:1:1:1, added to the silane solution, and then stirred evenly with a high-speed homogenizer. After standing at room temperature for 6h, it was dried at 90°C for 2h to obtain a modified filler; S4, adding the modified filler to the phenolic resin at a mass ratio of 8:100, and mixing them evenly by ultrasonic mixing and magnetic stirring to obtain a modified resin binder; S5, first placing the glass fiber fabric obtained in step S1 in the silane solution obtained in step S2, soaking for 30 minutes, and then placing it in the modified resin binder obtained in step S3, soaking for 5 minutes, to obtain a glass fiber cloth; S6. Dry the glass fiber cloth at 55°C for 8 minutes; then, pressurize and exhaust at 105°C at a pressure of 0.7MPa; then cure at 120°C for 1h, 150°C for 2h, and 180°C for 2h, and slowly cool to room temperature.

[0015] In order to better illustrate the technical effects of the present invention, the following embodiments are described: The filler components in steps S3 and S4 in Example 1 of the present invention are removed, and the other steps are the same as those in Example 1 of the present invention, as Comparative Example 1; Example 1 of a glass fiber cloth and its preparation process disclosed in Reference Document 1 (CN115012219B) is selected as Comparative Example 2, In Examples 1, 2 and 3 of the present invention and Comparative Examples 1 and 2, the weave type of the glass fiber cloth is plain weave, the radial density is 24 strands / cm, the weft density is 12 strands / cm, and the thickness is 0.035 mm.

[0016] 1. Tensile strength (unit: MPa), flexural strength (unit: MPa) and impact strength (unit: kJ / m 2 ) test; at the same time, the friction and wear performance test was carried out at a speed of 200 / min, a load of 180N, and a test time of 120min, and the wear depth (unit: mm) was measured; and the test results were recorded in the following Table 1.

[0017] Table 1 Glass fiber cloth performance test table

[0018] From Table 1 above, it can be concluded that the tensile strength, bending strength and impact strength of the glass fiber cloth in Example 1, Example 2 and Example 3 are significantly greater than those in Comparative Example 1 and Comparative Example 2; at the same time, the wear depth of the glass fiber cloth in Example 1, Example 2 and Example 3 is significantly less than that in Comparative Example 1 and Comparative Example 2; furthermore, it can be concluded that the glass fiber cloth prepared by the present invention has excellent tensile properties, bending properties and impact properties, and good wear resistance.

[0019] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A glass fiber cloth, characterized in that: The glass fiber monofilament and the carbon fiber monofilament are twisted into a mixed yarn, woven into a glass fiber fabric, and then respectively impregnated into a resin binder and a silane solution with fillers added thereto to prepare the fabric.

2. A method for preparing the glass fiber cloth according to claim 1, characterized in that: The following steps are involved: S1. 120 to 160 glass fiber monofilaments with a diameter of 5 to 8 um and 30 to 40 carbon fiber monofilaments with a diameter of 5 to 8 um are mixed and bundled, and then twisted into mixed yarn; according to the width and mesh distribution of the cloth, the glass fiber fabric is woven for standby use; S2, drying the silane coupling agent at 105-110°C for 3-4 hours; then adding the silane coupling agent to the acetone solvent in a mass ratio of (2-5):100 to prepare a silane solution for standby use; S3, adding the filler to the silane solution according to the mass ratio of (2-3):100, stirring evenly with a high-speed homogenizer, leaving at room temperature for 4-6 hours, and drying at 80-90° C. for 2-3 hours to obtain a modified filler; S4, adding the modified filler to the resin binder in a mass ratio of (5-8):100, and mixing evenly by ultrasonic mixing and magnetic stirring to obtain a modified resin binder; S5, first placing the glass fiber fabric obtained in step S1 in the silane solution obtained in step S2, soaking for 20 to 30 minutes, and then placing it in the modified resin binder obtained in step S3, soaking for 3 to 5 minutes, to obtain a glass fiber cloth; S6. Dry the glass fiber cloth at 50-55°C for 8-10 minutes; then, pressurize and exhaust at 100-105°C at a pressure of 0.6-0.7MPa; then, cure at 110-120°C for 1h, 140-150°C for 2h, and 170-180°C for 2h, and slowly cool to room temperature.

3. The method for preparing a glass fiber cloth according to claim 2, characterized in that: In the step S1, the carbon fiber is prepared by oxidation and carbonization of polyacrylonitrile fiber, asphalt fiber and polytetrafluoroethylene fiber in a mass ratio of 3:3:

1.

4. The method for preparing a glass fiber cloth according to claim 2, characterized in that: In the step S2, the silane treating agent is one or more of diethylaminomethyltriethoxysilane, dichloromethyltriethoxysilane, polymethyltriethoxysilane and γ-aminopropylmethyldiethoxysilane.

5. The method for preparing a glass fiber cloth according to claim 2, characterized in that: In the step S3, the filler is composed of titanium dioxide powder, calcium carbonate powder, molybdenum disulfide powder, aluminum borate powder, potassium titanate powder and calcium sulfate powder in a mass ratio of (5-8):(5-8):(3-4):(1-2):(1-2):(1-2), wherein the particle size of the titanium dioxide powder is 10-20 nm, the particle size of the calcium carbonate powder is 30-50 nm, the particle size of the molybdenum disulfide powder is 2-3 um, the particle size of the aluminum borate powder is 0.3-1 um, the particle size of the potassium titanate powder is 0.5-1.5 um, and the particle size of the calcium sulfate powder is 1-2 um.

6. The method for preparing a glass fiber cloth according to claim 2, characterized in that: In the step S4, the resin binder is one or more of bisphenol A cyanate ester, E-51 epoxy resin, phenolic resin and acetal resin.

Images