Low-elongation PTFE (Polytetrafluoroethylene) composite belt material and preparation process thereof

Abstract

The invention relates to the technical field of composite belt materials, in particular to a low-elongation PTFE composite belt material and a preparation process thereof. The composite material is prepared from the following raw materials in parts by weight: 20-30 parts of polytetrafluoroethylene, 3-6 parts of functional powder, 3-5 parts of modified fibers, 2-4 parts of nano titanium dioxide, 3-5 parts of paraffin oil and 2-5 parts of an antioxidant, the preparation method comprises the following steps: putting polytetrafluoroethylene, functional powder, modified fibers, nano titanium dioxide, paraffin oil and an antioxidant into mixing equipment, mixing and stirring, after uniformly mixing, pushing and extruding a mixed material obtained by using a pushing and pressing machine into strips, and then continuously calendering into sheets by using a double-roller calender, thereby obtaining the polytetrafluoroethylene composite material. And calendering the obtained sheet by using a double-roller calender at room temperature to obtain a PTFE composite belt semi-finished product, and finally heating the obtained PTFE composite belt semi-finished product. The prepared low-elongation PTFE composite belt material not only has low elongation at break, but also has excellent wear resistance, and the quality of the low-elongation PTFE composite belt material is effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of composite tape materials, in particular to a low-elongation PTFE composite tape material and a preparation process thereof. Background Art

[0002] Polytetrafluoroethylene (PTFE) is a polymer made from tetrafluoroethylene as a monomer. It has excellent heat and cold resistance. This material is resistant to acids, alkalis, and various organic solvents, and is almost insoluble in all solvents. At the same time, polytetrafluoroethylene has the characteristics of high temperature resistance. In addition to being a lubricant, it has also become an ideal coating for the inner layer of easy-to-clean water pipes.

[0003] In the patent document with application number "CN201911328756.8" and name "PTFE composite tape for aerospace cables and preparation method thereof", it is recorded that "In the PTFE composite tape of the present invention, the mass of PTFE accounts for 97%-99% of the total mass of the PTFE composite tape, the mass of titanium dioxide is 1%-3% of the mass of PTFE, and the mass of the coupling agent is 0.5%-2.5% of the mass of titanium dioxide. The method for preparing the PTFE composite tape of the present invention includes a surface modification step of titanium dioxide, a preparation step of PTFE powder and a preparation step of PTFE composite tape. The PTFE composite tape of the present invention has uniform thickness, high ultraviolet absorption, excellent thermal stability before 500°C, and a tensile strength of 12.17MPa, an elongation of 122%, and an insulating dielectric strength greater than 95kV / mm, meeting the performance requirements of the US military standard SAE AS22795 for high temperature resistant PTFE composite tape for aerospace use."

[0004] Although the PTFE composite tape manufactured by the above patent document has advantages such as thermal stability, its own elongation is high and still needs further improvement. Based on this, the present invention provides a low elongation PTFE composite tape material and its preparation process to solve the above technical problems! Summary of the invention

[0005] The purpose of the present invention is to provide a low-elongation PTFE composite tape material and a preparation process thereof. The prepared low-elongation PTFE composite tape material not only has a lower elongation at break, but also has excellent wear resistance, effectively ensuring its quality.

[0006] To achieve the above object, the present invention provides the following technical solutions: The first aspect of the present invention provides a low elongation PTFE composite tape material, which is composed of the following raw materials in parts by weight: 20 to 30 parts of polytetrafluoroethylene, 3 to 6 parts of functional powder, 3 to 5 parts of modified fiber, 2 to 4 parts of nano titanium dioxide, 3 to 5 parts of paraffin oil and 2 to 5 parts of antioxidant.

[0007] The present invention is further configured as follows: the preparation process of the functional powder is as follows: Place appropriate amounts of anhydrous ethanol, toluene and hexadecyltrimethoxysilane in a stirring device at a mass ratio of 1:0.6-0.8:0.12-0.22, mix for 20-30 minutes at 120-220 r / min, and then adjust the pH value to 8.2-8.8 with a sodium hydroxide solution to obtain a pre-prepared solution; Then add 0.23-0.43% of the base material by mass of the pre-prepared liquid, treat it at 8000-10000 r / min for 20-30 min, and then continue to treat it at 60-64°C and 120-220 r / min for 300-320 min. After filtration, wash it with anhydrous ethanol and deionized water for 2-4 times respectively, and dry the washed product at 50-60°C for 10-12 h to obtain functional powder.

[0008] The present invention is further configured as follows: the preparation process of the base material is as follows: Place an appropriate amount of titanium source material in an appropriate amount of deionized water at a mass ratio of 0.12 to 0.22:1, treat at 120 to 220 r / min for 20 to 30 minutes, add silicon dioxide, adjust the pH value to 7.0 to 7.4 with sodium hydroxide solution, treat at 55 to 65°C for 100 to 120 minutes, cool to room temperature, filter, wash the filter cake with deionized water for 2 to 4 times, and dry at 50 to 60°C for 4 to 5 hours to obtain a dry product; The dried product is placed in an appropriate amount of deionized water for ultrasonic treatment for 20 to 30 minutes at a solid-liquid ratio of 0.02 to 0.05 g / mL, and then an appropriate amount of glacial acetic acid is added thereto to adjust the pH value to 2.1 to 2.5, and then dried at a temperature of 50 to 60° C. for 4 to 5 hours, and calcined at a temperature of 510 to 520° C. for 120 to 140 minutes to obtain a base material.

[0009] The present invention is further configured as follows: the titanium source material is selected from any one of titanium nitrate and titanium sulfate.

[0010] The present invention is further configured as follows: the added amount of silicon dioxide is 20-26% of the mass of the titanium source material.

[0011] The present invention is further configured as follows: the preparation process of the modified fiber is as follows: The nano hollow glass microspheres are placed in the composite solution at a solid-liquid ratio of 0.02 to 0.12 g / mL for 24 to 26 hours, filtered, and then placed at 120 to 130° C. for 100 to 120 minutes to obtain pretreated nano hollow glass microspheres; The basalt fiber is ultrasonically dispersed in deionized water at a solid-liquid ratio of 0.02-0.08 g / mL for 20-30 minutes, and then 0.13-0.33% citric acid of the basalt fiber is added thereto, and treated at 120-140 r / min for 25-35 minutes, and then heated to 60-70°C and kept for 140-150 minutes, and then treated at 5-10°C and 120-140 r / min for 30-40 minutes, and then filtered, washed with deionized water for 2-4 times, and then dried at 50-60°C for 10-12 hours to obtain pretreated basalt fiber; The pretreated basalt fiber is placed in N, N-dimethylformamide for ultrasonic dispersion for 4 to 10 hours at a solid-liquid ratio of 0.02 to 0.06 g / mL, 1.4 to 6.4% of pretreated nano hollow glass microbeads are added thereto, and the pretreated basalt fiber is treated at 85 to 135° C. for 3 to 6 hours. After filtration, the pretreated fiber is washed with deionized water for 2 to 4 times, and then dried at 50 to 60° C. for 10 to 12 hours to obtain the modified fiber.

[0012] The present invention is further configured as follows: the composite solution is prepared by mixing N-(β-aminoethyl-γ-aminopropyl)methyldimethoxysilane, ethanol and distilled water in a mass ratio of 1:8.8-9.2:1.2-1.4.

[0013] The present invention is further configured as follows: the antioxidant is selected from any one of antioxidant 1010, antioxidant 1076, and antioxidant CA.

[0014] The second aspect of the present invention: also provides a preparation process of the above-mentioned low elongation PTFE composite tape material, comprising the following steps: Step 1: accurately weigh polytetrafluoroethylene, functional powder, modified fiber, nano titanium dioxide, paraffin oil and antioxidant, and put them into a mixing device for mixing and stirring; Step 2: After being mixed evenly, the mixed material is pushed into strips using a pusher at 60-150° C., and then further rolled into a sheet using a double-roll calender at 92-100° C., and the obtained sheet is rolled using a double-roll calender at room temperature to obtain a PTFE composite tape semi-finished product; Step 3: heating the obtained PTFE composite tape semi-finished product at 310-330° C. for 12-22 seconds to obtain a low elongation PTFE composite tape material.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention puts polytetrafluoroethylene, functional powder, modified fiber, nano titanium dioxide, paraffin oil and antioxidant into a mixing device for mixing and stirring. After being evenly mixed, the mixed material obtained by a pusher is pushed into a strip, and then a double-roll calender is used to continue to calender into a thin sheet, and the obtained thin sheet is calendered by a double-roll calender at room temperature to obtain a PTFE composite tape semi-finished product, and finally the obtained PTFE composite tape semi-finished product is heated to obtain a low-elongation PTFE composite tape material. The low-elongation PTFE composite tape material prepared by the present invention not only has a lower elongation at break, but also has excellent wear resistance, which effectively guarantees its quality. The low-elongation PTFE composite tape material and its preparation process provided by the present invention have a broader market prospect and are more suitable for promotion. DETAILED DESCRIPTION

[0016] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Example 1: This example provides a low elongation PTFE composite tape material, which is composed of the following raw materials in parts by weight: 20 parts of polytetrafluoroethylene, 3 parts of functional powder, 3 parts of modified fiber, 2 parts of nano titanium dioxide, 3 parts of paraffin oil and 2 parts of antioxidant.

[0018] Among them, the preparation process of functional powder is as follows: Place appropriate amounts of anhydrous ethanol, toluene and hexadecyltrimethoxysilane in a stirring device at a mass ratio of 1:0.6:0.12, mix at 120 r / min for 20 min, and then adjust the pH value to 8.2 with a sodium hydroxide solution to obtain a pre-prepared solution; Then, add 0.23% of the base material by weight of the pre-prepared liquid into it, treat it at 8000r / min for 20min, and then continue to treat it at 60℃ and 120r / min for 300min. After filtration, wash it twice with anhydrous ethanol and deionized water respectively, and dry the washed product at 50℃ for 10h to obtain functional powder.

[0019] Further, the preparation process of the base material is as follows: An appropriate amount of titanium source material was placed in an appropriate amount of deionized water at a mass ratio of 0.12:1, treated at 120 r / min for 20 min, silicon dioxide was added thereto, and the pH value was adjusted to 7.0 with sodium hydroxide solution, treated at 55°C for 100 min, cooled to room temperature, filtered, and the obtained filter cake was washed twice with deionized water, and dried at 50°C for 4 h to obtain a dry product; The dried product was placed in an appropriate amount of deionized water for ultrasonic treatment for 20 minutes at a solid-liquid ratio of 0.02 g / mL, and then an appropriate amount of glacial acetic acid was added thereto to adjust the pH value to 2.1. It was then dried at 50°C for 4 hours and calcined at 510°C for 120 minutes to obtain a base material.

[0020] In addition, titanium nitrate is selected as the titanium source material.

[0021] The amount of silicon dioxide added is 20% of the mass of the titanium source material.

[0022] Among them, the preparation process of modified fiber is as follows: The nano hollow glass microspheres were placed in the composite solution at a solid-liquid ratio of 0.02 g / mL for 24 hours, filtered, and placed at 120°C for 100 minutes to obtain pretreated nano hollow glass microspheres; The basalt fiber was ultrasonically dispersed in deionized water at a solid-liquid ratio of 0.02 g / mL for 20 minutes, and then 0.13% citric acid was added thereto, and the fiber was treated at 120 r / min for 25 minutes, and then heated to 60°C for 140 minutes, and then treated at 5°C and 120 r / min for 30 minutes. After filtration, the fiber was washed twice with deionized water, and then dried at 50°C for 10 hours to obtain the pretreated basalt fiber. The pretreated basalt fiber was ultrasonically dispersed in N,N-dimethylformamide at a solid-liquid ratio of 0.02 g / mL for 4 hours, 1.4% of the pretreated basalt fiber was added thereto, and the pretreated nano hollow glass beads were treated at 85°C for 3 hours. After filtration, the pretreated fiber was washed twice with deionized water and dried at 50°C for 10 hours to obtain the modified fiber.

[0023] Furthermore, the composite solution is prepared by mixing N-(β-aminoethyl-γ-aminopropyl)methyldimethoxysilane, ethanol and distilled water in a mass ratio of 1:8.8:1.2.

[0024] The antioxidant used is antioxidant 1010.

[0025] In addition, this embodiment also provides a preparation process of the low elongation PTFE composite tape material, comprising the following steps: Step 1: accurately weigh polytetrafluoroethylene, functional powder, modified fiber, nano titanium dioxide, paraffin oil and antioxidant, and put them into a mixing device for mixing and stirring; Step 2: After being evenly mixed, the mixed material is pushed into strips using a pusher at 60°C, and then further rolled into a thin sheet using a double-roll calender at 92°C, and the obtained thin sheet is rolled using a double-roll calender at room temperature to obtain a PTFE composite tape semi-finished product; Step 3: Heat the obtained PTFE composite tape semi-finished product at 310° C. for 12 seconds to obtain a low elongation PTFE composite tape material.

[0026] Example 2: The preparation process of the low elongation PTFE composite tape material provided in this example is basically the same as that in Example 1, except that: the specific raw material composition and the specific preparation process of the low elongation PTFE composite tape material in this example are different; the specific raw material composition and the specific preparation process of the low elongation PTFE composite tape material in this example are as follows: The present embodiment provides a low elongation PTFE composite tape material, which is composed of the following raw materials in parts by weight: 25 parts of polytetrafluoroethylene, 4 parts of functional powder, 4 parts of modified fiber, 3 parts of nano titanium dioxide, 4 parts of paraffin oil and 4 parts of antioxidant.

[0027] Among them, the preparation process of functional powder is as follows: Place appropriate amounts of anhydrous ethanol, toluene and hexadecyltrimethoxysilane in a stirring device at a mass ratio of 1:0.7:0.17, mix at 170 r / min for 25 min, and then adjust the pH value to 8.4 with a sodium hydroxide solution to obtain a pre-prepared solution; Then, 0.33% of the base material by weight of the pre-prepared liquid was added thereto, and the mixture was treated at 9000 r / min for 25 min, and then further treated at 62°C and 170 r / min for 310 min. After filtration, the mixture was washed three times with anhydrous ethanol and deionized water respectively, and the washed product was dried at 55°C for 11 h to obtain a functional powder.

[0028] Further, the preparation process of the base material is as follows: An appropriate amount of titanium source material was placed in an appropriate amount of deionized water at a mass ratio of 0.17:1, treated at 170 r / min for 25 min, silicon dioxide was added thereto, and the pH value was adjusted to 7.2 with sodium hydroxide solution, treated at 60°C for 110 min, cooled to room temperature, filtered, and the obtained filter cake was washed 3 times with deionized water, and dried at 55°C for 5 h to obtain a dry product; The dried product was placed in an appropriate amount of deionized water for ultrasonic treatment for 25 min at a solid-liquid ratio of 0.03 g / mL, and then an appropriate amount of glacial acetic acid was added thereto to adjust the pH value to 2.4. It was then dried at 55°C for 5h and calcined at 515°C for 130min to obtain a base material.

[0029] In addition, titanium sulfate is selected as the titanium source material.

[0030] The amount of silicon dioxide added is 23% of the mass of the titanium source material.

[0031] Among them, the preparation process of modified fiber is as follows: The nano hollow glass microspheres were placed in the composite solution at a solid-liquid ratio of 0.07 g / mL for 25 hours, filtered, and then placed at 125°C for 110 minutes to obtain pretreated nano hollow glass microspheres. The basalt fiber was ultrasonically dispersed in deionized water at a solid-liquid ratio of 0.05 g / mL for 25 minutes, and then 0.23% citric acid was added thereto, and the mixture was treated at 130 r / min for 30 minutes, and then heated to 65°C and kept for 145 minutes, and then treated at 7°C and 130 r / min for 35 minutes. After filtration, the mixture was washed with deionized water for 3 times, and then dried at 55°C for 11 hours to obtain the pretreated basalt fiber. The pretreated basalt fiber was ultrasonically dispersed in N,N-dimethylformamide at a solid-liquid ratio of 0.04 g / mL for 6 hours, 3.4% of the pretreated basalt fiber was added thereto, and the pretreated nano hollow glass microbeads were treated at 115°C for 5 hours. After filtration, the pretreated fiber was washed three times with deionized water and dried at 55°C for 11 hours to obtain the modified fiber.

[0032] Furthermore, the composite solution is prepared by mixing N-(β-aminoethyl-γ-aminopropyl)methyldimethoxysilane, ethanol and distilled water in a mass ratio of 1:9:1.3.

[0033] The antioxidant used is antioxidant 1010.

[0034] In addition, this embodiment also provides a preparation process of the low elongation PTFE composite tape material, comprising the following steps: Step 1: accurately weigh polytetrafluoroethylene, functional powder, modified fiber, nano titanium dioxide, paraffin oil and antioxidant, and put them into a mixing device for mixing and stirring; Step 2: After being mixed evenly, the mixed material is pushed into strips using a pusher at 90°C, and then further rolled into a thin sheet using a double-roll calender at 97°C, and the obtained thin sheet is rolled using a double-roll calender at room temperature to obtain a PTFE composite tape semi-finished product; Step 3: Heat the obtained PTFE composite tape semi-finished product at 320° C. for 17 seconds to obtain a low elongation PTFE composite tape material.

[0035] Example 3: The preparation process of the low elongation PTFE composite tape material provided in this example is basically the same as that in Example 1, except that: the specific raw material composition and the specific preparation process of the low elongation PTFE composite tape material in this example are different; the specific raw material composition and the specific preparation process of the low elongation PTFE composite tape material in this example are as follows: The present embodiment provides a low elongation PTFE composite tape material, which is composed of the following raw materials in parts by weight: 30 parts of polytetrafluoroethylene, 6 parts of functional powder, 5 parts of modified fiber, 4 parts of nano titanium dioxide, 5 parts of paraffin oil and 5 parts of antioxidant.

[0036] Among them, the preparation process of functional powder is as follows: Place appropriate amounts of anhydrous ethanol, toluene and hexadecyltrimethoxysilane in a stirring device at a mass ratio of 1:0.8:0.22, mix at 220 r / min for 30 min, and then adjust the pH value to 8.8 with a sodium hydroxide solution to obtain a pre-prepared solution; Then add 0.23-0.43% of the base material by mass of the pre-prepared liquid, treat it at 10000r / min for 30min, and then continue to treat it at 64℃ and 220r / min for 320min. After filtration, wash it with anhydrous ethanol and deionized water for 4 times respectively, and dry the washed product at 60℃ for 12h to obtain functional powder.

[0037] Further, the preparation process of the base material is as follows: An appropriate amount of titanium source material was placed in an appropriate amount of deionized water at a mass ratio of 0.22:1, treated at 220 r / min for 30 min, silicon dioxide was added thereto, and the pH value was adjusted to 7.4 with sodium hydroxide solution, treated at 65°C for 120 min, cooled to room temperature, filtered, and the obtained filter cake was washed 4 times with deionized water, and dried at 60°C for 5 h to obtain a dry product; The dried product was placed in an appropriate amount of deionized water for ultrasonic treatment for 30 min at a solid-liquid ratio of 0.05 g / mL, and then an appropriate amount of glacial acetic acid was added thereto to adjust the pH value to 2.5. It was then dried at 60°C for 5 h and calcined at 520°C for 140 min to obtain a base material.

[0038] In addition, titanium nitrate is selected as the titanium source material.

[0039] The amount of silicon dioxide added is 26% of the mass of the titanium source material.

[0040] Among them, the preparation process of modified fiber is as follows: The nano hollow glass microspheres were placed in the composite solution at a solid-liquid ratio of 0.12 g / mL for 26 hours, filtered, and placed at 130°C for 120 minutes to obtain pretreated nano hollow glass microspheres; The basalt fiber was ultrasonically dispersed in deionized water at a solid-liquid ratio of 0.08 g / mL for 30 minutes, and then 0.33% citric acid was added thereto, and the fiber was treated at 140 r / min for 35 minutes, and then the temperature was raised to 70°C and kept for 150 minutes, and then the fiber was treated at 10°C and 140 r / min for 40 minutes. After filtration, the fiber was washed with deionized water for 4 times, and then dried at 60°C for 12 hours to obtain the pretreated basalt fiber. The pretreated basalt fiber was ultrasonically dispersed in N,N-dimethylformamide at a solid-liquid ratio of 0.06 g / mL for 10 h, and 6.4% of the pretreated basalt fiber was added thereto. The pretreated nano hollow glass beads were treated at 135 ° C for 6 h. After filtration, the pretreated fiber was washed with deionized water for 4 times and dried at 60 ° C for 12 h to obtain the modified fiber.

[0041] Furthermore, the composite solution is prepared by mixing N-(β-aminoethyl-γ-aminopropyl)methyldimethoxysilane, ethanol and distilled water in a mass ratio of 1:9.2:1.4.

[0042] The antioxidant used is antioxidant 1010.

[0043] In addition, this embodiment also provides a preparation process of the low elongation PTFE composite tape material, comprising the following steps: Step 1: accurately weigh polytetrafluoroethylene, functional powder, modified fiber, nano titanium dioxide, paraffin oil and antioxidant, and put them into a mixing device for mixing and stirring; Step 2: After being mixed evenly, the mixed material is pushed into strips using a push press at 150° C., and then further rolled into a sheet using a double-roll calender at 100° C., and the obtained sheet is rolled using a double-roll calender at room temperature to obtain a PTFE composite tape semi-finished product; Step 3: Heat the obtained PTFE composite tape semi-finished product at 330° C. for 22 seconds to obtain a low elongation PTFE composite tape material.

[0044] Comparative Example 1: The difference from Example 1 is that this example does not contain functional powder.

[0045] Comparative Example 2: The difference from Example 1 is that this example does not contain modified fiber.

[0046] Comparative Example 3: The difference from Example 1 is that in this example, an equal amount of basalt fiber is used instead of modified fiber.

[0047] Performance test: The PTFE composite tape material samples provided in Examples 1 to 3 and Comparative Examples 1 to 3 are marked as Examples 1 to 3 and Comparative Examples 1 to 3, respectively; and the relevant properties of the PTFE composite tape materials provided in Examples 1 to 3 and Comparative Examples 1 to 3 are tested as follows: 1. Elongation test: Test in accordance with the testing standard of HG / T 3028-1999.

[0048] 2. Wear resistance test: Test according to the test standard of GB / T5478-2008, and calculate the wear amount (mg) at 1000r. Measure 3 times for each group and take the average value.

[0049] The obtained test data are recorded in Table 1 and Table 2 below.

[0050]

[0051]

[0052] By comparing and analyzing the relevant data in Table 1 and Table 2, it can be seen that the low elongation PTFE composite tape material prepared by the present invention not only has a low elongation at break, but also has excellent wear resistance, effectively ensuring its quality. This shows that the low elongation PTFE composite tape material and its preparation process provided by the present invention have a broader market prospect and are more suitable for promotion.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. Low elongation PTFE composite tape material, characterized in that: The invention is composed of the following raw materials in parts by weight: 20 to 30 parts of polytetrafluoroethylene, 3 to 6 parts of functional powder, 3 to 5 parts of modified fiber, 2 to 4 parts of nano titanium dioxide, 3 to 5 parts of paraffin oil and 2 to 5 parts of antioxidant.

2. The low elongation PTFE composite tape material according to claim 1, characterized in that: The preparation process of the functional powder is as follows: Place appropriate amounts of anhydrous ethanol, toluene and hexadecyltrimethoxysilane in a stirring device at a mass ratio of 1:0.6-0.8:0.12-0.22, mix for 20-30 minutes at 120-220 r / min, and then adjust the pH value to 8.2-8.8 with a sodium hydroxide solution to obtain a pre-prepared solution; Then add 0.23-0.43% of the base material by mass of the pre-prepared liquid, treat it at 8000-10000 r / min for 20-30 min, and then continue to treat it at 60-64°C and 120-220 r / min for 300-320 min. After filtration, wash it with anhydrous ethanol and deionized water for 2-4 times respectively, and dry the washed product at 50-60°C for 10-12 h to obtain functional powder.

3. The low elongation PTFE composite tape material according to claim 2, characterized in that: The preparation process of the base material is as follows: Place an appropriate amount of titanium source material in an appropriate amount of deionized water at a mass ratio of 0.12 to 0.22:1, treat at 120 to 220 r / min for 20 to 30 minutes, add silicon dioxide, adjust the pH value to 7.0 to 7.4 with sodium hydroxide solution, treat at 55 to 65°C for 100 to 120 minutes, cool to room temperature, filter, wash the filter cake with deionized water for 2 to 4 times, and dry at 50 to 60°C for 4 to 5 hours to obtain a dry product; The dried product is placed in an appropriate amount of deionized water for ultrasonic treatment for 20 to 30 minutes at a solid-liquid ratio of 0.02 to 0.05 g / mL, and then an appropriate amount of glacial acetic acid is added thereto to adjust the pH value to 2.1 to 2.5, and then dried at 50 to 60° C. for 4 to 5 hours, and calcined at 510 to 520° C. for 120 to 140 minutes to obtain a base material.

4. The low elongation PTFE composite tape material according to claim 3, characterized in that: The titanium source material is selected from any one of titanium nitrate and titanium sulfate.

5. The low elongation PTFE composite tape material according to claim 3, characterized in that: The added amount of silicon dioxide is 20-26% of the mass of the titanium source material.

6. The low elongation PTFE composite tape material according to claim 1, characterized in that: The preparation process of the modified fiber is as follows: The nano hollow glass microspheres are placed in the composite solution at a solid-liquid ratio of 0.02 to 0.12 g / mL for 24 to 26 hours, filtered, and then placed at 120 to 130° C. for 100 to 120 minutes to obtain pretreated nano hollow glass microspheres; The basalt fiber is ultrasonically dispersed in deionized water at a solid-liquid ratio of 0.02-0.08 g / mL for 20-30 minutes, and then 0.13-0.33% citric acid is added thereto, and the fiber is treated at 120-140 r / min for 25-35 minutes, and then the temperature is raised to 60-70°C and the temperature is kept for 140-150 minutes, and then the fiber is treated at 5-10°C and 120-140 r / min for 30-40 minutes, and then filtered, washed with deionized water for 2-4 times, and then dried at 50-60°C for 10-12 hours to obtain pretreated basalt fiber; The pretreated basalt fiber is placed in N, N-dimethylformamide for ultrasonic dispersion for 4 to 10 hours at a solid-liquid ratio of 0.02 to 0.06 g / mL, 1.4 to 6.4% of pretreated nano hollow glass microbeads are added thereto, and the pretreated basalt fiber is treated at 85 to 135° C. for 3 to 6 hours. After filtration, the pretreated fiber is washed with deionized water for 2 to 4 times, and then dried at 50 to 60° C. for 10 to 12 hours to obtain the modified fiber.

7. The low elongation PTFE composite tape material according to claim 6, characterized in that: The composite solution is prepared by mixing N-(β-aminoethyl-γ-aminopropyl)methyldimethoxysilane, ethanol and distilled water in a mass ratio of 1:8.8-9.2:1.2-1.

4.

8. The low elongation PTFE composite tape material according to claim 1, characterized in that: The antioxidant is selected from any one of antioxidant 1010, antioxidant 1076, and antioxidant CA.

9. The process for preparing the low elongation PTFE composite tape material according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: accurately weigh polytetrafluoroethylene, functional powder, modified fiber, nano titanium dioxide, paraffin oil and antioxidant, and put them into a mixing device for mixing and stirring; Step 2: After being mixed evenly, the mixed material is pushed into strips using a pusher at 60-150° C., and then further rolled into a sheet using a double-roll calender at 92-100° C., and the obtained sheet is rolled using a double-roll calender at room temperature to obtain a PTFE composite tape semi-finished product; Step 3: heating the obtained PTFE composite tape semi-finished product at 310-330° C. for 12-22 seconds to obtain a low elongation PTFE composite tape material.

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