A basalt stranded fiber for enhancing cement-based or ceramic-based materials and its production device

Abstract

The present invention relates to the technical field of fiber materials, and particularly relates to a basalt stranded fiber for reinforcing cement-based or ceramic-based materials. In the present invention, carboxylated carbon nanotubes are used to modify basalt fibers, and the carboxylated carbon nanotubes are grafted and connected to the surface of basalt fibers through the action of a silane coupling agent, which can improve the mechanical properties of basalt fibers and enable the basalt stranded fibers to be better applied to the preparation of cement-based materials or ceramic-based materials; in the present invention, a production device is used to connect seven single-filament fibers prepared from modified basalt fibers to each other through a stranding and bonding action to prepare basalt stranded fibers, which can improve the strength and toughness of basalt stranded fibers to a certain extent, so that the produced basalt stranded fibers have a uniform diameter and excellent mechanical properties, high-temperature stability and corrosion resistance, and are particularly suitable for the preparation of fiber-reinforced cement-based and ceramic-based materials.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber materials, and particularly to a basalt stranded fiber for reinforcing cement-based or ceramic-based materials. Background Art

[0002] In industries such as construction, transportation, and energy, cement-based and ceramic-based materials are widely used because these materials have good structural stability and durability. However, the tensile strength, compressive strength, and heat resistance of these materials themselves are usually low, which limits their application scope. To improve these properties, researchers have tried many methods, such as adding various types of reinforcing fibers. In traditional fiber-reinforced composites, the reinforcing effect of a single fiber is not good, and its bonding strength is low, which limits its performance in practical applications. For example, when subjected to external forces, due to the insufficient strength and weak bonding ability of single fibers, the overall structure may break, thereby reducing the reliability and service life of the material.

[0003] Basalt fiber is a natural mineral fiber made by mechanically drawing molten basalt. Basalt fiber has good mechanical properties, heat resistance, corrosion resistance, and a lower cost than other types of fibers. However, conventional basalt fibers usually have regular shapes and cannot effectively combine with cement-based and ceramic-based materials. Therefore, the effect of improving the properties of composite materials is not satisfactory. If the basalt fiber itself can be modified to improve its dispersion degree during the combination with cement-based and ceramic-based materials while maintaining its original excellent properties, and be better applied to the preparation of fiber-reinforced cement-based and ceramic-based materials, then the market application prospect of basalt fiber can be improved to a great extent. Summary of the Invention

[0004] Technical Problems to be Solved

[0005] In view of the above-mentioned drawbacks of the prior art, the present invention provides a basalt stranded fiber for reinforcing cement-based or ceramic-based materials, aiming to overcome the disadvantages of poor reinforcing effect and low bonding strength of existing single-filament basalt fibers, so that the basalt stranded fibers produced by the production device of the present invention have a uniform diameter and excellent mechanical properties, high-temperature stability, and corrosion resistance, and are particularly suitable for the preparation of fiber-reinforced cement-based and ceramic-based materials.

[0006] Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0008] A basalt stranded fiber for enhancing cement-based or ceramic-based materials, the raw materials of the basalt stranded fiber comprising, by weight parts: 80-90 parts of modified basalt fiber, 45-50 parts of nano-silica, 10-20 parts of aluminum oxide, 10-20 parts of iron oxide, 1-2 parts of calcium oxide, 1-2 parts of magnesium oxide, 1-2 parts of sodium oxide and a post-treatment spraying component;

[0009] The production method of the basalt stranded fiber is as follows: melt-blend the above-mentioned raw materials by weight parts, then use the melt spinning technology to prepare the melt-blended raw materials into single filament fibers, connect 7 single filament fibers to each other through a stranding and bonding effect by a production device, and finally spray a silane coupling agent hydrolysis spraying liquid on the surface and then cut, and the obtained is the basalt stranded fiber.

[0010] Furthermore, the preparation method of the modified basalt fiber is as follows:

[0011] S1. Immerse the basalt fiber in acetone, heat and reflux it in an oil bath at 60°C for 8 h, then wash it with deionized water and dry it in an oven at 55°C, and the obtained is recorded as the basalt fiber after surface desizing;

[0012] S2. Mix absolute ethanol and deionized water according to a volume ratio of 95:5, then add a silane coupling agent with a volume fraction of 10%, ultrasonically disperse it for 30 min for hydrolysis, and adjust the pH value to 5 with acetic acid after hydrolysis, and the obtained is recorded as the silane coupling agent hydrolysis component;

[0013] S3. Immerse the basalt fiber in S2 in the silane coupling agent hydrolysis component, react it in a water bath at 50°C for 12 h, then wash it with deionized water and dry it in an oven at 55°C, and the obtained is recorded as the pre-modified basalt fiber;

[0014] S4. Disperse carboxylated carbon nanotubes in absolute ethanol according to a mass fraction of 0.5%, prepare a suspension after ultrasonic treatment for 2 h, immerse the pre-modified basalt fiber in S3 in the suspension, and dry it after immersion, and the obtained is the modified basalt fiber.

[0015] Furthermore, the ultrasonic dispersion frequency in S2 is 23-25 kHz, and the ultrasonic dispersion frequency in S4 is 22-23 kHz.

[0016] Furthermore, the diameter range of the basalt fiber is 50-100 μm.

[0017] Furthermore, the temperature of the melt blending is 1400-1600°C.

[0018] Furthermore, the stretching rate of the melt spinning is 1-5 mm / min.

[0019] Furthermore, the cross-sectional shape of the basalt stranded fiber is honeycomb-shaped, and the stranding form of the basalt stranded fiber is parallel stranding.

[0020] Furthermore, the diameter range of the basalt stranded fiber is 0.08 - 0.24 mm, and the length range is 10 - 15 mm.

[0021] Furthermore, the silane coupling agent hydrolysis spraying solution is prepared by mixing silane coupling agent, absolute ethanol and deionized water in a volume ratio of 10:95:5.

[0022] A production device for basalt stranded fibers used to reinforce cement-based or ceramic-based materials. The production device includes a melting furnace. A feeding port is installed at the top of the melting furnace, and an extrusion die is arranged on the right side of the melting furnace. A stranding disc, a stranding die, a tension thermoplastic device, a post-treatment device nozzle, a cutting device and a discharge port are sequentially arranged on the right side of the extrusion die.

[0023] Beneficial effects

[0024] Adopting the technical solution provided by the present invention, compared with the known public technology, it has the following beneficial effects:

[0025] 1. The present invention modifies basalt fibers with carboxylated carbon nanotubes, grafts and connects the carboxylated carbon nanotubes on the surface of basalt fibers through the action of a silane coupling agent, which can improve the mechanical properties of basalt fibers and enable them to better adsorb nano-silica, aluminum oxide, iron oxide, calcium oxide, magnesium oxide and sodium oxide, thereby improving the mechanical properties of basalt stranded fibers prepared from the modified basalt fibers, and enabling basalt stranded fibers to be better applied to the preparation of cement-based materials or ceramic-based materials.

[0026] 2. The present invention uses the production device to connect 7 single-filament fibers prepared from modified basalt fibers to each other through stranding and bonding to prepare basalt stranded fibers, which can improve the strength and toughness of basalt stranded fibers to a certain extent, making the produced basalt stranded fibers have a uniform diameter and excellent mechanical properties, high-temperature stability and corrosion resistance, and are particularly suitable for the preparation of fiber-reinforced cement-based and ceramic-based materials.

[0027] The basalt stranded fibers prepared by the present invention can better disperse the force during the actual stress process, enhance the tensile strength and impact resistance of the composite material doped with it, and can also provide a larger surface area, enhancing the bonding performance with the composite material matrix, thereby significantly improving the overall performance of the composite material; Secondly, the basalt stranded fibers prepared by the present invention can disperse the stress to multiple fibers, significantly improving the fatigue resistance of the composite material doped with it, and can better withstand repeated stress cycles, thereby extending the service life of the composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram of the production device of the present invention;

[0030] Figure 2 It is a schematic structural diagram of the basalt stranded fibers for enhancing cement-based or ceramic-based materials of the present invention;

[0031] Figure 3 It is a schematic cross-sectional structure diagram of the basalt stranded fibers for enhancing cement-based or ceramic-based materials of the present invention;

[0032] The reference numerals in the drawings respectively represent: 1 - melting furnace; 2 - feeding port; 3 - extrusion die; 4 - stranded wire reel; 5 - stranded wire die; 6 - tension thermoplastic device; 7 - nozzle of post-treatment device; 8 - cutting device; 9 - discharge port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0034] The following further describes the present invention with reference to the embodiments.

[0035] Embodiment 1

[0036] A basalt stranded fiber for enhancing cement-based or ceramic-based materials in this embodiment, the raw materials of the basalt stranded fiber include, by weight: 80 parts of modified basalt fiber, 45 parts of nano-silica, 10 parts of aluminum oxide, 10 parts of iron oxide, 1 part of calcium oxide, 1 part of magnesium oxide, 1 part of sodium oxide and a post-treatment spraying component;

[0037] The production method of the basalt stranded fiber is as follows: melt and blend the above-mentioned raw materials by weight, then use the melt spinning technology to prepare the raw materials after melt blending into single filament fibers, connect 7 single filament fibers to each other through stranding and bonding by a production device, and finally spray and coat with a silane coupling agent hydrolysis spraying liquid and then cut, and the obtained is the basalt stranded fiber.

[0038] The preparation method of the modified basalt fiber is as follows:

[0039] S1. Immerse the basalt fiber in acetone, heat and reflux it in an oil bath at 60 °C for 8 h, then wash it with deionized water and dry it in an oven at 55 °C, and the obtained is recorded as the basalt fiber after surface desizing;

[0040] S2. Mix absolute ethanol and deionized water according to a volume ratio of 95:5, then add a silane coupling agent with a volume fraction of 10%, and ultrasonically disperse it for 30 min for hydrolysis. After hydrolysis, adjust the pH value to 5 with acetic acid, and the obtained is recorded as the silane coupling agent hydrolysis component;

[0041] S3. Immerse the basalt fiber in S2 in the silane coupling agent hydrolysis component, react it in a water bath at 50 °C for 12 h, then wash it with deionized water and dry it in an oven at 55 °C, and the obtained is recorded as the pre-modified basalt fiber;

[0042] S4. Disperse carboxylated carbon nanotubes in absolute ethanol according to a mass fraction of 0.5%, prepare a suspension after ultrasonic treatment for 2 h, immerse the pre-modified basalt fiber in S3 in the suspension, and dry it after immersion, and the obtained is the modified basalt fiber.

[0043] The ultrasonic dispersion frequency in S2 is 23 kHz, and the ultrasonic dispersion frequency in S4 is 22 kHz.

[0044] The diameter of the basalt fiber is 50 μm.

[0045] The temperature of the melt blending is 1400 °C.

[0046] The stretching rate of the melt spinning is 1 mm / min.

[0047] The cross-sectional shape of the basalt stranded fiber is honeycomb-shaped, and the stranding form of the basalt stranded fiber is parallel stranding.

[0048] The diameter of the basalt stranded fiber is 0.08 mm and the length is 10 mm.

[0049] The silane coupling agent hydrolysis spraying liquid is prepared by mixing silane coupling agent, absolute ethanol and deionized water in a volume ratio of 10:95:5.

[0050] A production device for basalt stranded fibers used to reinforce cement-based or ceramic-based materials, the production device includes a melting furnace 1, a feeding port 2 is installed at the top of the melting furnace 1, and an extrusion die 3 is arranged on the right side of the melting furnace 1. A stranded wire disk 4, a stranded wire die 5, a tension thermoplastic device 6, a post-treatment device nozzle 7, a cutting device 8 and a discharge port 9 are successively arranged on the right side of the extrusion die 3.

[0051] The specific usage method of the production device includes the following steps:

[0052] Step1. Set the stranding parameters, including the diameter range and length of the stranded fiber, set the stranding density to 100 twist / m, and set the stranding angle to 20 degrees;

[0053] Step2. Pour the raw material of the basalt stranded fiber into the melting furnace 1 along the feeding port 2 and carry out melting and blending at a specified temperature. Then, use the melt spinning technology to prepare the raw material after melting and blending into single filament fibers through the extrusion die 3;

[0054] Step3. Introduce 7 single filament fibers into the stranded wire disk 4 to start stranding, make them twist and bond with each other to form a stranded wire structure. By adjusting the speed, tension of the stranding machine and the rotation direction of the stranded wire die 5, control the stranding tightness and stranding angle of the fiber. The stranded fiber is led out along the stranded wire die 5 and the tension thermoplastic device 6 and extends to the lower part of the post-treatment device nozzle 7; among them, the rotation speed of the stranding machine is 1000 rpm;

[0055] Step4. Spray the silane coupling agent hydrolysis spraying liquid through the post-treatment device nozzle 7, spray it on the surface of the fiber below the post-treatment device nozzle 7, and then cut the fiber with the silane coupling agent hydrolysis spraying liquid on the surface through the cutting device 8. After drying, the obtained product is the basalt stranded fiber used to reinforce cement-based or ceramic-based materials.

[0056] Among them, the schematic structural diagram of the basalt stranded fiber used to reinforce cement-based or ceramic-based materials is as Figure 2 shown, and the schematic cross-sectional structural diagram of the basalt stranded fiber used to reinforce cement-based or ceramic-based materials is as Figure 3 shown.

[0057] Example 2

[0058] A basalt stranded fiber for enhancing cement-based or ceramic-based materials in this embodiment, the raw materials of the basalt stranded fiber include, by weight: 90 parts of modified basalt fiber, 50 parts of nano-silica, 20 parts of aluminum oxide, 20 parts of iron oxide, 2 parts of calcium oxide, 2 parts of magnesium oxide, 2 parts of sodium oxide and a post-treatment spray component;

[0059] The production method of the basalt stranded fiber is as follows: melt and blend the above-mentioned raw materials by weight, then use the melt spinning technology to prepare single filament fibers from the melt-blended raw materials, connect 7 single filament fibers to each other through stranding and bonding by a production device, and finally spray and coat with a silane coupling agent hydrolysis spray solution and then cut, and the obtained is the basalt stranded fiber.

[0060] The preparation method of the modified basalt fiber is as follows:

[0061] S1. Immerse the basalt fiber in acetone, heat and reflux for 8 h under the condition of an oil bath at 60 °C, and after completion, wash with deionized water and dry in an oven at 55 °C, and the obtained is recorded as the basalt fiber after surface desizing;

[0062] S2. Mix absolute ethanol and deionized water according to a volume ratio of 95:5, then add a silane coupling agent with a volume fraction of 10%, and perform ultrasonic dispersion for 30 min for hydrolysis. After hydrolysis, adjust the pH value to 5 with acetic acid, and the obtained is recorded as the silane coupling agent hydrolysis component;

[0063] S3. Immerse the basalt fiber in S2 in the silane coupling agent hydrolysis component, react for 12 h under the condition of a water bath at 50 °C, and after completion, wash with deionized water and dry in an oven at 55 °C, and the obtained is recorded as the pre-modified basalt fiber;

[0064] S4. Disperse carboxylated carbon nanotubes in absolute ethanol according to a mass fraction of 0.5%, prepare a suspension after ultrasonic treatment for 2 h, immerse the pre-modified basalt fiber in S3 in the suspension, and dry after immersion, and the obtained is the modified basalt fiber.

[0065] The ultrasonic dispersion frequency in S2 is 25 kHz, and the ultrasonic dispersion frequency in S4 is 23 kHz.

[0066] The diameter of the basalt fiber is 100 μm.

[0067] The temperature of the melt blending is 1600 °C.

[0068] The stretching rate of the melt spinning is 5 mm / min.

[0069] The cross-sectional shape of the basalt stranded fiber is honeycomb-shaped, and the stranding form of the basalt stranded fiber is parallel stranding.

[0070] The diameter of the basalt stranded fiber is 0.24 mm and the length is 15 mm.

[0071] The silane coupling agent hydrolysis spray liquid is prepared by mixing silane coupling agent, absolute ethanol and deionized water in a volume ratio of 10:95:5.

[0072] A production device for basalt stranded fibers used to reinforce cement-based or ceramic-based materials, the production device includes a melting furnace 1, a feeding port 2 is installed at the top of the melting furnace 1, and an extrusion die 3 is arranged on the right side of the melting furnace 1. A stranding disc 4, a stranding die 5, a tension thermoplastic device 6, a post-treatment device nozzle 7, a cutting device 8 and a discharge port 9 are successively arranged on the right side of the extrusion die 3.

[0073] The specific usage method of the production device includes the following steps:

[0074] Step1. Set the stranding parameters, including the diameter range and length of the stranded fiber, set the stranding density to 500 twist / m, and set the stranding angle to 30 degrees;

[0075] Step2. Pour the raw material of the basalt stranded fiber into the melting furnace 1 through the feeding port 2 and carry out melting and blending at a specified temperature. Then, use the melt spinning technology to prepare the raw material after melting and blending into single filament fibers through the extrusion die 3.

[0076] Step3. Introduce 7 single filament fibers into the stranding disc 4 to start stranding, make them twist and bond with each other to form a stranded structure, control the stranding tightness and stranding angle of the fibers by adjusting the speed, tension of the stranding machine and the rotation direction of the stranding die 5. The stranded fibers are led out along the stranding die 5 and the tension thermoplastic device 6 and extended to the lower part of the post-treatment device nozzle 7; among them, the rotation speed of the stranding machine is 5000 rpm;

[0077] Step4. Spray the silane coupling agent hydrolysis spray liquid through the post-treatment device nozzle 7, spray it on the surface of the fibers below the post-treatment device nozzle 7, and then cut the fibers with the silane coupling agent hydrolysis spray liquid on the surface through the cutting device 8. After drying, the obtained product is the basalt stranded fiber used to reinforce cement-based or ceramic-based materials.

[0078] Among them, the structural schematic diagram of the basalt stranded fiber used to reinforce cement-based or ceramic-based materials is as Figure 2 shown, and the cross-sectional structural schematic diagram of the basalt stranded fiber used to reinforce cement-based or ceramic-based materials is as Figure 3 shown.

[0079] Example 3

[0080] A basalt stranded fiber for enhancing cement-based or ceramic-based materials in this embodiment, the raw materials of the basalt stranded fiber include, by weight: 85 parts of modified basalt fiber, 48 parts of nano-silica, 15 parts of aluminum oxide, 15 parts of iron oxide, 1 part of calcium oxide, 2 parts of magnesium oxide, 1 part of sodium oxide and a post-treatment spraying component;

[0081] The production method of the basalt stranded fiber is: melt-blend the above-mentioned raw materials by weight, then use the melt spinning technology to prepare the melt-blended raw materials into single-filament fibers, connect 7 single-filament fibers to each other through stranding and bonding by a production device, and finally spray a silane coupling agent hydrolysis spraying solution on the surface and then cut, and the obtained is the basalt stranded fiber.

[0082] The preparation method of the modified basalt fiber is:

[0083] S1. Immerse the basalt fiber in acetone and heat it under reflux in an oil bath at 60 °C for 8 h. After completion, wash it with deionized water and dry it in an oven at 55 °C. The obtained is recorded as the basalt fiber after surface desizing;

[0084] S2. Mix absolute ethanol and deionized water according to a volume ratio of 95:5, then add a silane coupling agent with a volume fraction of 10%, and ultrasonically disperse it for 30 min for hydrolysis. After hydrolysis, adjust the pH value to 5 with acetic acid. The obtained is recorded as the silane coupling agent hydrolysis component;

[0085] S3. Immerse the basalt fiber in S2 in the silane coupling agent hydrolysis component, react in a water bath at 50 °C for 12 h. After completion, wash it with deionized water and dry it in an oven at 55 °C. The obtained is recorded as the pre-modified basalt fiber;

[0086] S4. Disperse carboxylated carbon nanotubes in absolute ethanol according to a mass fraction of 0.5%, prepare a suspension after ultrasonic treatment for 2 h, immerse the pre-modified basalt fiber in S3 in the suspension, and dry it after soaking. The obtained is the modified basalt fiber.

[0087] The ultrasonic dispersion frequency in S2 is 24 kHz, and the ultrasonic dispersion frequency in S4 is 23 kHz.

[0088] The diameter of the basalt fiber is 80 μm.

[0089] The temperature of the melt blending is 1500 °C.

[0090] The stretching rate of the melt spinning is 3 mm / min.

[0091] The cross-sectional shape of the basalt stranded fiber is honeycomb-shaped, and the stranding form of the basalt stranded fiber is parallel stranding.

[0092] The diameter of the basalt stranded fiber is 0.16 mm and the length is 13 mm.

[0093] The silane coupling agent hydrolysis spray liquid is prepared by mixing silane coupling agent, absolute ethanol and deionized water in a volume ratio of 10:95:5.

[0094] A production device for basalt stranded fibers used to reinforce cement-based or ceramic-based materials, the production device includes a melting furnace 1, a feeding port 2 is installed at the top of the melting furnace 1, and an extrusion die 3 is arranged on the right side of the melting furnace 1. A stranded wire disc 4, a stranding die 5, a tension thermoplastic device 6, a post-treatment device nozzle 7, a cutting device 8 and a discharge port 9 are sequentially arranged on the right side of the extrusion die 3.

[0095] The specific usage method of the production device includes the following steps:

[0096] Step1. Set the stranding parameters, including the diameter range and length of the stranded fiber, set the stranding density to 300 twist / m, and set the stranding angle to 25 degrees;

[0097] Step2. Pour the raw material of the basalt stranded fiber into the melting furnace 1 through the feeding port 2 and carry out melting and blending at a specified temperature. Then, use the melt spinning technology to prepare the raw material after melting and blending into single filament fibers through the extrusion die 3;

[0098] Step3. Introduce 7 single filament fibers into the stranded wire disc 4 to start stranding, so that they are stranded and bonded to form a stranded wire structure. By adjusting the speed, tension of the stranding machine and the rotation direction of the stranding die 5, control the stranding tightness and stranding angle of the fiber. The stranded fiber is led out along the stranding die 5 and the tension thermoplastic device 6 and extends to the lower part of the post-treatment device nozzle 7; among them, the rotation speed of the stranding machine is 3000 rpm;

[0099] Step4. Spray the silane coupling agent hydrolysis spray liquid through the post-treatment device nozzle 7, spray it on the surface of the fiber below the post-treatment device nozzle 7, and then cut the fiber with the silane coupling agent hydrolysis spray liquid on the surface through the cutting device 8. After drying, the obtained product is the basalt stranded fiber used to reinforce cement-based or ceramic-based materials.

[0100] Among them, the structural schematic diagram of the basalt stranded fiber used to reinforce cement-based or ceramic-based materials is as Figure 2 shown, and the cross-sectional structural schematic diagram of the basalt stranded fiber used to reinforce cement-based or ceramic-based materials is as Figure 3 shown.

[0101] Performance test

[0102] The basalt stranded fibers prepared in Examples 1-3 were respectively labeled as Example 1, Example 2, and Example 3, and the single-filament basalt fibers obtained from the market were labeled as the comparative example. Then, the performance of Examples 1-3 and the comparative example was detected, and the specific detection data was recorded in the following table:

[0103] It can be seen from the data in the above table that the basalt stranded fibers prepared in Examples 1-3 of the present invention have higher tensile strength and greater density, and the elastic modulus and elongation at break of the basalt stranded fibers prepared in Examples 1-3 of the present invention are significantly greater than those of the comparative example. Therefore, it shows that the basalt stranded fibers prepared by the production device of the present invention for reinforcing cement-based or ceramic-based materials have better market promotion value.

[0104] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A basalt stranded fiber for reinforcing cement-based or ceramic-based materials, characterized in that, The raw materials of the basalt stranded fiber include, by weight: 80-90 parts of modified basalt fiber, 45-50 parts of nano-silica, 10-20 parts of aluminum oxide, 10-20 parts of iron oxide, 1-2 parts of calcium oxide, 1-2 parts of magnesium oxide, 1-2 parts of sodium oxide, and a silane coupling agent hydrolysis spray solution; The production method of the basalt stranded fiber is as follows: melt-blend the above-mentioned raw materials by weight, then use the melt spinning technology to prepare the melt-blended raw materials into single filament fibers, connect 7 single filament fibers to each other through stranding and bonding by a production device, and finally spray the silane coupling agent hydrolysis spray solution on the surface and then cut it. What is obtained is the basalt stranded fiber; The preparation method of the modified basalt fiber is as follows: S1. Immerse the basalt fiber in acetone and heat it under reflux in an oil bath at 60 °C for 8 h. After completion, wash it with deionized water and dry it in an oven at 55 °C. What is obtained is recorded as the basalt fiber after surface desizing; S2. Mix absolute ethanol and deionized water according to a volume ratio of 95:5, then add a silane coupling agent with a volume fraction of 10%, and ultrasonically disperse it for 30 min for hydrolysis. After hydrolysis, adjust the pH value to 5 with acetic acid. What is obtained is recorded as the silane coupling agent hydrolysis component; S3. Immerse the basalt fiber in S1 in the silane coupling agent hydrolysis component in S2, react it under a water bath condition at 50 °C for 12 h. After completion, wash it with deionized water and dry it in an oven at 55 °C. What is obtained is recorded as the pre-modified basalt fiber; S4. Disperse carboxylated carbon nanotubes in absolute ethanol according to a mass fraction of 0.5%, prepare a suspension after ultrasonic treatment for 2 h, immerse the pre-modified basalt fiber in S3 in the suspension, and dry it after immersion. What is obtained is the modified basalt fiber.

2. The basalt stranded fiber for reinforcing cement-based or ceramic-based materials according to claim 1, characterized in that, The ultrasonic dispersion frequency in S2 is 23-25 kHz, and the ultrasonic dispersion frequency in S4 is 22-23 kHz.

3. A basalt stranded fiber for reinforcing cement-based or ceramic-based materials according to claim 1, characterized in that, The diameter range of the basalt fiber is 50-100 μm.

4. The basalt stranded fiber for enhancing cement-based or ceramic-based materials according to claim 1, wherein The temperature of the melt blending is 1400-1600 °C.

5. A basalt stranded fiber for enhancing cement-based or ceramic-based materials according to claim 1, wherein, The stretching rate of the melt spinning is 1-5 mm / min.

6. The basalt stranded fiber for enhancing cement-based or ceramic-based materials according to claim 1, characterized in that, The cross-sectional shape of the basalt stranded fiber is honeycomb-shaped, and the stranding form of the basalt stranded fiber is parallel stranding.

7. A basalt stranded fiber for enhancing cement-based or ceramic-based materials according to claim 1, characterized in that, The diameter range of the basalt stranded fiber is 0.08-0.24 mm, and the length range is 10-15 mm.

8. A basalt stranded fiber for enhancing cement-based or ceramic-based materials according to claim 1, characterized in that, The silane coupling agent hydrolysis spray solution is prepared by mixing a silane coupling agent, absolute ethanol, and deionized water according to a volume ratio of 10:95:5.

Images