Metaposition aramid paper resistant to ultraviolet aging, preparation method and application thereof

Abstract

The application belongs to the technical field of aramid paper, and particularly relates to a meta-aramid paper with ultraviolet aging resistance, a preparation method and application. The preparation method of the meta-aramid paper with ultraviolet aging resistance comprises the following steps: first, defibrillation beating is performed by using a defibrator; then, a sheet former is used to form the pulp; and finally, hot pressing is performed by using a hot press. The nano metal oxide with ultraviolet resistance added in the defibrillation beating process can be uniformly dispersed in the meta-aramid paper, the ultraviolet resistance is fully exerted, and the meta-aramid paper is endowed with excellent ultraviolet aging resistance. Furthermore, by adjusting the nano metal oxide with ultraviolet resistance and performing ultrasonic treatment on the nano metal oxide with ultraviolet resistance in advance, the excellent ultraviolet aging resistance of the meta-aramid paper can be further improved, and the technical problem that the existing preparation method is difficult to prepare high-performance meta-aramid paper is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aramid paper, and particularly relates to a meta-aramid paper with ultraviolet aging resistance and a preparation method and application thereof. BACKGROUND

[0002] Aramid paper (polyaramid fiber paper) is a new type of functional material, which has high strength, low deformation, high temperature resistance, chemical corrosion resistance, flame retardation and excellent electrical insulation performance, and is commonly used in high-speed rail transportation, aerospace, electrical insulation and other fields.

[0003] According to different materials, aramid paper is divided into meta-aramid paper and para-aramid paper. The meta-aramid paper is prepared by using meta-aramid fiber and meta-aramid short fiber through a device such as a defibrator, a sheet former and a hot press, and through steps such as paper forming, pressing, drying and hot pressing. The aramid fiber used in the meta-aramid paper is a material sensitive to light. When exposed to sunlight or ultraviolet light for a long time, the breaking of the amide bond will change the molecular structure of the aramid and reduce the performance of the meta-aramid paper when the energy provided by the ultraviolet light is much greater than the energy required for the breaking of the amide bond. The reliability and stability of the aramid paper can be improved by reducing the breaking of the amide bond of the aramid fiber caused by light, improving the ultraviolet aging resistance of the meta-aramid paper, and meeting the high-quality development requirements in the fields of high-speed rail transportation, aerospace, electrical insulation and the like.

[0004] However, the research on the meta-aramid paper is not deep enough, and the performance of the meta-aramid paper prepared by using meta-aramid fiber and meta-aramid short fiber as raw materials is low. SUMMARY

[0005] Therefore, the application provides a meta-aramid paper with ultraviolet aging resistance and a preparation method and application thereof, to solve the technical problem that the existing preparation method is difficult to prepare a high-performance meta-aramid paper.

[0006] The first aspect of the application provides a preparation method of a meta-aramid paper with ultraviolet aging resistance, which comprises the following steps:

[0007] In step S1, nano metal oxide with ultraviolet resistance and meta-aramid fiber are added to a defibrator for defibration and beating to obtain meta-aramid fiber slurry doped with nano metal oxide.

[0008] In step S2, meta-aramid short fiber treated with a surface active agent and the meta-aramid fiber slurry doped with nano metal oxide are added to a sheet former, and paper forming, pressing and drying are sequentially performed to obtain a shaped meta-aramid paper.

[0009] In step S3, the shaped meta-aramid paper is hot-pressed by using a hot press to obtain a meta-aramid paper with ultraviolet aging resistance.

[0010] Preferably, in step S1, the adding of the nano metal oxide with anti-ultraviolet performance and meta-aramid fiber into the defibrator for defibration and beating is specifically: adding at least one of nano titanium dioxide particles, nano zinc oxide particles and nano silicon dioxide particles and meta-aramid fiber into the defibrator for defibration and beating.

[0011] Preferably, in step S1, the adding of the nano metal oxide with anti-ultraviolet performance and meta-aramid fiber into the defibrator for defibration and beating is specifically: adding nano titanium dioxide particles and nano zinc oxide particles with a mass ratio of 1:0.5~2 and meta-aramid fiber into the defibrator for defibration and beating.

[0012] Preferably, in step S1, the adding of the nano metal oxide with anti-ultraviolet performance and meta-aramid fiber into the defibrator for defibration and beating is specifically: adding nano metal oxide with anti-ultraviolet performance with a particle size of 30~100nm and meta-aramid fiber into the defibrator for defibration and beating.

[0013] Preferably, in step S1, the adding of the nano metal oxide with anti-ultraviolet performance and meta-aramid fiber into the defibrator for defibration and beating is specifically: adding nano metal oxide with anti-ultraviolet performance and water after ultrasonic dispersion treatment and meta-aramid fiber into the defibrator for defibration and beating.

[0014] Preferably, in step S1, the adding of the nano metal oxide with anti-ultraviolet performance and meta-aramid fiber into the defibrator for defibration and beating to obtain meta-aramid fiber doped with nano metal oxide is specifically: adding nano metal oxide with anti-ultraviolet performance and meta-aramid fiber into the defibrator for defibration and beating to obtain meta-aramid fiber doped with nano metal oxide with a beating degree of 30°SR~80°SR.

[0015] Preferably, in step S1, the adding of the nano metal oxide with anti-ultraviolet performance and meta-aramid fiber into the defibrator for defibration and beating to obtain meta-aramid fiber doped with nano metal oxide is specifically: adding nano metal oxide with anti-ultraviolet performance and meta-aramid fiber into the defibrator for defibration and beating to obtain meta-aramid fiber doped with nano metal oxide with a defibration concentration of 0.1%~0.3%.

[0016] In step S2, the step of adding the surface active agent treated meta-aramid short fibers and the meta-aramid fiber sedimentation fiber slurry doped with nano metal oxides into the sheet former is specifically: adding the surface active agent treated meta-aramid short fibers of 1mm-10mm and the meta-aramid fiber sedimentation fiber slurry doped with nano metal oxides into the sheet former.

[0017] Preferably, in step S3, the temperature of the hot pressing is 250-300℃, the pressure is 2Mpa-5Mpa, and the roller speed is 5m / min-15m / min.

[0018] The second aspect of the present application provides a kind of anti-UV aging meta-aramid paper, which is prepared by the preparation method of the anti-UV aging meta-aramid paper of the first aspect.

[0019] The third aspect of the present application provides the application of the anti-UV aging meta-aramid paper of the second aspect in high-speed rail transportation field, aerospace field or electrical insulation field.

[0020] In summary, the present application provides a kind of anti-UV aging meta-aramid paper and preparation method and application, the preparation method of the anti-UV aging meta-aramid paper provided by the present application includes first nano metal oxide with anti-UV performance and meta-aramid fiber sedimentation are added into defibrator and are defibrated and beaten, to obtain meta-aramid fiber sedimentation slurry doped with nano metal oxide;Then surface active agent treated meta-aramid short fibers and meta-aramid fiber sedimentation slurry doped with nano metal oxide are added into sheet former, and are sequentially papered, pressed, dried, to obtain shaped meta-aramid paper;Subsequently, the shaped meta-aramid paper is hot pressed using hot press, to obtain anti-UV aging meta-aramid paper;The nano metal oxide with anti-UV performance added in preparation method can reduce the amide bond rupture caused by ultraviolet light energy, improve the stability of aramid molecular structure, which is conducive to the tensile strength and other properties of meta-aramid paper can be maintained for a long time, and the nano metal oxide with anti-UV performance added in defibration and beating process can improve the dispersibility of nano metal oxide, which is conducive to the full play of nano metal oxide anti-UV performance, and can prepare meta-aramid paper with excellent anti-UV aging, thereby solving the technical problems that existing preparation methods are difficult to prepare high-performance meta-aramid paper. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 A flowchart of a preparation method of an anti-ultraviolet aging meta-aramid paper provided by the present application. DETAILED DESCRIPTION

[0023] The present application provides an anti-ultraviolet aging meta-aramid paper and a preparation method and application, which are used to solve the technical problem that the existing preparation method is difficult to prepare high-performance meta-aramid paper.

[0024] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] In view of the defects that the performance of the prepared meta-aramid paper is low, the present application provides a preparation method of an anti-ultraviolet aging meta-aramid paper, which comprises the following steps: first, adding nano metal oxide with anti-ultraviolet performance and meta-aramid fibrid into a defibrator for defibration and beating to obtain meta-aramid fibrid pulp doped with nano metal oxide; then, adding meta-aramid short-cut fiber treated by a surface active agent and the meta-aramid fibrid pulp doped with nano metal oxide into a sheet former, and sequentially performing paper forming, pressing and drying to obtain a formed meta-aramid paper; and then, using a hot press to heat-press the formed meta-aramid paper to obtain an anti-ultraviolet aging meta-aramid paper.

[0026] The preparation method of the anti-ultraviolet aging meta-aramid paper provided by the application comprises the following steps: firstly, pulp is obtained by using a defibrator to defibrate beating; secondly, the pulp is prepared into a meta-aramid paper by using a sheet former; and thirdly, the meta-aramid paper is hot-pressed into a shape by using a hot press. The nano metal oxide added in the preparation process is a metal oxide particle with a particle size less than 100 nanometers, which has unique physical and chemical properties. Some nano metal oxides, such as nano titanium dioxide particles, nano zinc oxide particles and nano silicon dioxide particles, have anti-ultraviolet ability, and are nano metal oxides with anti-ultraviolet performance. The nano metal oxide particles with anti-ultraviolet performance are doped into the meta-aramid paper, which can reduce the breaking of amide bonds caused by ultraviolet light energy, and the molecular structure of aramid is difficult to change, so that the tensile strength and other properties of the meta-aramid paper can be maintained for a long time, the meta-aramid paper is not easy to be aged due to ultraviolet radiation, and the anti-ultraviolet aging and other properties of the meta-aramid paper are improved. Moreover, the nano metal oxide with anti-ultraviolet performance is added in the defibration beating process. In the defibration beating process, high-intensity impact and shear force are applied to the nano metal oxide and meta-aramid sedimentation fibers by the action between the high-speed rotating rotor and stator of the defibrator, which can change the morphology of the meta-aramid sedimentation fibers and the morphology and surface energy of the nano metal oxide, promote the dispersibility of the nano metal oxide, and increase the contact and adhesion time of the nano metal oxide and the sedimentation fibers. In addition, the nano metal oxide is added in the defibration beating process instead of being added in the pulp forming process, which increases the contact and adhesion time of the nano metal oxide and the sedimentation fibers, reduces the flocculation of the pulp and the nano metal oxide, and improves the dispersibility of the nano metal oxide. Therefore, the anti-ultraviolet performance of the nano metal oxide can be fully utilized, and the performance of the meta-aramid paper prepared at present is improved.

[0027] Preferably, in the preparation method of the anti-ultraviolet aging meta-aramid paper provided by the application, the nano metal oxide with anti-ultraviolet performance is a mixture of nano titanium dioxide particles and nano zinc oxide particles. The nano titanium dioxide particles are expensive, while the nano zinc oxide particles are relatively cheap. The mixture of the two can reduce the cost of the nano metal oxide. Moreover, the nano titanium dioxide particles and the nano zinc oxide particles have different anti-ultraviolet wavelengths. In the ultraviolet wavelength range of 10-400 nm, the nano titanium dioxide particles have better anti-ultraviolet aging effect on the wavelength of 290-350 nm, while the nano zinc oxide particles have better anti-ultraviolet aging effect on the wavelength above 350 nm. By mixing the nano titanium dioxide particles and the nano zinc oxide particles, the wavelength range of the anti-ultraviolet aging of the nano metal oxide can be wider.

[0028] Preferably, in the preparation method of the anti-ultraviolet aging meta-aramid paper provided by the application, the particle size of the nano metal oxide with anti-ultraviolet performance is selected from 30-100 nm.

[0029] As preferred, in the preparation method of the anti-ultraviolet aging meta-aramid paper provided in the application, in order to further promote the dispersibility of the nano metal oxide with anti-ultraviolet performance, the nano metal oxide with anti-ultraviolet performance and water can be subjected to ultrasonic dispersion treatment in advance before being added in the defibration and beating process.

[0030] The nano metal oxide with anti-ultraviolet performance provided in the application will be specifically described below in combination with examples and experimental examples

[0031] Example 1

[0032] The example 1 of the application provides a preparation method of anti-ultraviolet aging meta-aramid paper, and the preparation method comprises the following steps: a step of defibration and beating by using a defibrator, a step of forming a pulp by using a sheet former, and a step of hot pressing by using a hot press.

[0033] The step of defibration and beating by using the defibrator comprises: ultrasonic treatment of 1 kg of nano zinc oxide and 10 kg of water to prepare a suspension, and defibration and beating of 6 kg of meta-aramid fibrid fibers and 3483 kg of water in the defibrator to obtain meta-aramid fibrid fiber pulp doped with nano metal oxide with a defibration concentration of 0.23% and a beating degree of 70°SR.

[0034] The step of forming a pulp by using the sheet former comprises: treating 3 kg of meta-aramid short fibers (7 mm) with a 0.01 mol / L sodium dodecyl benzene sulfonate solution for 30 min to obtain meta-aramid short fibers treated with a surface active agent, and adding the meta-aramid short fibers treated with the surface active agent and the meta-aramid fibrid fiber pulp doped with nano metal oxide into the sheet former to sequentially perform paper forming, pressing, and drying to obtain a formed meta-aramid paper.

[0035] The step of hot pressing by using the hot press comprises: hot pressing the formed meta-aramid paper by using the hot press at a temperature of 280°C, a pressure of 4 MPa, and a roller speed of 10 m / min to obtain an anti-ultraviolet aging meta-aramid paper.

[0036] Example 2

[0037] The example 2 of the application provides a preparation method of anti-ultraviolet aging meta-aramid paper, and the preparation method is different from the example 1 in that the nano metal oxide with anti-ultraviolet performance is adjusted, and the preparation method comprises the following steps: a step of defibration and beating by using a defibrator, a step of forming a pulp by using a sheet former, and a step of hot pressing by using a hot press.

[0038] The step of using the defibrator to defibrate and beat up includes: preparing a suspension by ultrasonic treatment of 0.5 kg of nano zinc oxide, 0.5 kg of nano titanium dioxide and 10 kg of water, and adding 6 kg of meta-aramid fibrids and 3483 kg of water to the defibrator to defibrate and beat up, to obtain meta-aramid fibrid pulp doped with nano metal oxide with a defibration consistency of 0.23% and a beating degree of 70°SR.

[0039] The step of using the sheet former to form the pulp includes: treating 3 kg of meta-aramid short fibers (7 mm) with 0.01 mol / L of sodium dodecyl benzene sulfonate solution for 30 min to obtain surfactant-treated meta-aramid short fibers, and adding the surfactant-treated meta-aramid short fibers and the meta-aramid fibrid pulp doped with nano metal oxide to the sheet former to sequentially perform sheet forming, pressing and drying, to obtain the meta-aramid paper.

[0040] The step of using the hot press to hot-press includes: using the hot press to hot-press the meta-aramid paper at a temperature of 280°C, a pressure of 4 MPa and a roller speed of 10 m / min, to obtain the meta-aramid paper resistant to ultraviolet aging.

[0041] Embodiment 3

[0042] The embodiment 3 of the present application provides a preparation method of meta-aramid paper resistant to ultraviolet aging, and the difference between the preparation method and the embodiment 2 is that the adding process of the nano metal oxide with ultraviolet resistance is adjusted, and the preparation method includes the steps of: the step of using the defibrator to defibrate and beat up, the step of using the sheet former to form the pulp, and the step of using the hot press to hot-press.

[0043] The step of using the defibrator to defibrate and beat up includes: adding 0.5 kg of nano zinc oxide, 0.5 kg of nano titanium dioxide, 6 kg of meta-aramid fibrids and 2993 kg of water to the defibrator to defibrate and beat up, to obtain meta-aramid fibrid pulp doped with nano metal oxide with a defibration consistency of 0.23% and a beating degree of 70°SR.

[0044] The step of using the sheet former to form the pulp includes: treating 3 kg of meta-aramid short fibers (7 mm) with 0.01 mol / L of sodium dodecyl benzene sulfonate solution for 30 min to obtain surfactant-treated meta-aramid short fibers, and adding the surfactant-treated meta-aramid short fibers and the meta-aramid fibrid pulp doped with nano metal oxide to the sheet former to sequentially perform sheet forming, pressing and drying, to obtain the meta-aramid paper.

[0045] The step of using a hot press to hot press includes: using a hot press to hot press the formed meta-aramid paper at a temperature of 280 DEG C, a pressure of 4Mpa, and a roll speed of 10m / min, to obtain the anti-UV aging meta-aramid paper.

[0046] Embodiment 4

[0047] The embodiment 4 of the present application provides a preparation method of the anti-UV aging meta-aramid paper, and the preparation method is different from the embodiment 2 in that the amount of the raw material is adjusted, and the preparation method includes the steps of: the step of using a defibrator to defibrate and beat the pulp, the step of using a sheet former to form the pulp, and the step of using a hot press to hot press.

[0048] The step of using the defibrator to defibrate and beat the pulp includes: adding 0.5kg of nano zinc oxide, 0.5kg of nano titanium dioxide, 6kg of meta-aramid fibrid, and 2993kg into the defibrator to defibrate and beat the pulp, to obtain the meta-aramid fibrid pulp doped with nano metal oxide with a defibration concentration of 0.23% and a beating degree of 70°SR.

[0049] The step of using the sheet former to form the pulp includes: using 0.01mol / L of sodium dodecyl benzene sulfonate solution to treat 3kg of meta-aramid short fibers (5mm) for 30min to obtain the meta-aramid short fibers treated with a surface active agent, and adding the meta-aramid short fibers treated with the surface active agent and the meta-aramid fibrid pulp doped with nano metal oxide into the sheet former to sequentially perform sheet forming, pressing, and drying, to obtain the formed meta-aramid paper.

[0050] The step of using the hot press to hot press includes: using the hot press to hot press the formed meta-aramid paper at a temperature of 280 DEG C, a pressure of 4Mpa, and a roll speed of 10m / min, to obtain the anti-UV aging meta-aramid paper.

[0051] Embodiment 5

[0052] The embodiment 5 of the present application provides a preparation method of the anti-UV aging meta-aramid paper, and the preparation method is different from the embodiment 4 in that the amount of the raw material is adjusted, and the preparation method includes the steps of: the step of using a defibrator to defibrate and beat the pulp, the step of using a sheet former to form the pulp, and the step of using a hot press to hot press.

[0053] The step of using the defibrator to defibrate and beat the pulp includes: adding 0.5kg of nano zinc oxide, 0.5kg of nano titanium dioxide, 6kg of meta-aramid fibrid, and 2993kg into the defibrator to defibrate and beat the pulp, to obtain the meta-aramid fibrid pulp doped with nano metal oxide with a defibration concentration of 0.23% and a beating degree of 70°SR.

[0054] The step of using the sheet former to form the pulp slurry includes: treating 3 kg of meta-aramid short fibers (5 mm) with 0.01 mol / L of sodium dodecyl benzene sulfonate solution for 30 min to obtain meta-aramid short fibers treated with a surface active agent, adding the meta-aramid short fibers treated with the surface active agent and the meta-aramid fiber sedimentation fiber pulp doped with nano metal oxides into the sheet former, and sequentially performing paper forming, pressing, and drying to obtain the meta-aramid paper.

[0055] The step of using the hot press to perform hot pressing includes: using the hot press to perform hot pressing on the meta-aramid paper at a temperature of 280 DEG C, a pressure of 4 Mpa, and a roller speed of 10 m / min to obtain the meta-aramid paper resistant to ultraviolet aging.

[0056] Embodiment 6

[0057] The embodiment 6 of the present application provides a preparation method of meta-aramid paper resistant to ultraviolet aging, and the preparation method is different from that of the embodiment 4 in that the amount of the raw material is adjusted, and the preparation method includes the steps of: the step of using the defibrator to perform defibration beating, the step of using the sheet former to form the pulp slurry, and the step of using the hot press to perform hot pressing.

[0058] The step of using the defibrator to perform defibration beating includes: adding 0.5 kg of nano zinc oxide, 0.5 kg of nano titanium dioxide, 5.5 kg of meta-aramid fiber sedimentation fiber, and 2993.5 kg into the defibrator to perform defibration beating to obtain meta-aramid fiber sedimentation fiber pulp doped with nano metal oxides with a defibration concentration of 0.22% and a beating degree of 70°SR.

[0059] The step of using the sheet former to form the pulp slurry includes: treating 3 kg of meta-aramid short fibers (5 mm) with 0.01 mol / L of sodium dodecyl benzene sulfonate solution for 30 min to obtain meta-aramid short fibers treated with a surface active agent, adding the meta-aramid short fibers treated with the surface active agent and the meta-aramid fiber sedimentation fiber pulp doped with nano metal oxides into the sheet former, and sequentially performing paper forming, pressing, and drying to obtain the meta-aramid paper.

[0060] The step of using the hot press to perform hot pressing includes: using the hot press to perform hot pressing on the meta-aramid paper at a temperature of 280 DEG C, a pressure of 4 Mpa, and a roller speed of 10 m / min to obtain the meta-aramid paper resistant to ultraviolet aging.

[0061] Embodiment 7

[0062] The embodiment 7 of the present application provides a preparation method of meta-aramid paper, which is a comparative embodiment, and the preparation method includes the steps of: the step of using the defibrator to perform defibration beating, the step of using the sheet former to form the pulp slurry, and the step of using the hot press to perform hot pressing.

[0063] The step of performing defibration beating in the defibrator includes: adding 6 kg of meta-aramid fibrid fibers and 2994 kg of water into the defibrator to perform defibration beating, to obtain meta-aramid fibrid fiber slurry with a defibration consistency of 0.2% and a beating degree of 70°SR.

[0064] The step of forming the slurry using the sheet former includes: treating 4 kg of meta-aramid short fibers (7 mm) with 0.01 mol / L of sodium dodecyl benzene sulfonate solution for 30 min to obtain surfactant-treated meta-aramid short fibers, and adding the surfactant-treated meta-aramid short fibers and the meta-aramid fibrid fiber slurry into the sheet former to sequentially perform sheet forming, pressing, and drying, to obtain a meta-aramid paper.

[0065] The step of performing hot pressing using the hot press includes: using the hot press to hot press the meta-aramid paper at a temperature of 280°C, a pressure of 4 MPa, and a roll speed of 10 m / min, to obtain a meta-aramid paper.

[0066] Experimental Example 1

[0067] The anti-ultraviolet aging meta-aramid paper and meta-aramid paper provided in Examples 1-7 were tested for performance in Experimental Example 1 of the present application.

[0068] The performance testing process was as follows: first, the anti-tensile strength of the anti-ultraviolet aging meta-aramid paper and meta-aramid paper provided in Examples 1-7 was tested according to the national standard GB / T12914-2008, then the anti-ultraviolet aging meta-aramid paper and meta-aramid paper provided in Examples 1-7 were subjected to 80h and 160h ultraviolet aging according to the description in the national standard GB / T 16422.3-2022, and the tensile strength was tested according to the national standard GB / T12914-2008, to obtain the tensile strength performance test results shown in Table 1.

[0069] Table 1: Tensile strength performance test results

[0070]

[0071] As can be seen from the test results shown in Table 1, Example 7 as a comparative example did not add nano-titanium dioxide, nano-zinc oxide, and other nano-metal oxides with anti-ultraviolet properties in the process of preparing the meta-aramid paper, which made the amide bonds of the aramid molecules in the meta-aramid paper prone to breakage under ultraviolet irradiation, thereby the tensile strength of the meta-aramid paper decreased rapidly, decaying by 12% after 80h of ultraviolet irradiation, and decaying by 22% after 160h, with only 78% of the original tensile strength.

[0072] And the process of preparing meta-aramid paper in example 1-6 added nano titanium dioxide, nano zinc oxide and other nano metal oxides with anti-ultraviolet performance, which makes it easy to break the amide bond of aramid molecules in meta-aramid paper under ultraviolet irradiation, and the tensile strength of meta-aramid paper is not easy to decline, which is anti-aging meta-aramid paper.

[0073] Further comparison of meta-aramid paper prepared in examples 1-6 can be found that the anti-aging meta-aramid paper provided in example 1 only added nano zinc oxide with anti-ultraviolet performance, although the cost of nano zinc oxide is lower, but the tensile strength of meta-aramid paper decreases faster than that of anti-aging meta-aramid paper provided in example 2, because the anti-aging meta-aramid paper provided in example 2 uses nano zinc oxide and nano titanium dioxide, so that the wavelength range of anti-aging meta-aramid paper is wider, so the tensile strength decreases more slowly.

[0074] Further comparison of meta-aramid paper prepared in examples 1-6 can be found that the anti-aging meta-aramid paper provided in example 3, although added nano zinc oxide and nano titanium dioxide, but the nano zinc oxide and nano titanium dioxide are not pre-treated by ultrasonic dispersion, so that the tensile strength of meta-aramid paper decreases faster than that of anti-aging meta-aramid paper provided in example 2.

[0075] The above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the examples of the present application.

Claims

1. A method for preparing an ultraviolet-aging resistant meta-aramid paper, characterized in that, The method comprises the steps of: Step S1, adding nano metal oxide with anti-ultraviolet performance and meta-aramid fiber into a defibrator for defibration and beating to obtain meta-aramid fiber pulp doped with nano metal oxide; Step S2, adding meta-aramid short fibers treated by a surface active agent and the meta-aramid fiber pulp doped with nano metal oxide into a sheet former, and sequentially performing papermaking, pressing and drying to obtain a meta-aramid paper; Step S3, hot pressing the meta-aramid paper by using a hot press to obtain an anti-ultraviolet aging meta-aramid paper.

2. A process for the preparation of an ultraviolet aged resistant meta-aramid paper according to claim 1, characterized in that, Step S1 specifically comprises: adding at least one of nano titanium dioxide particles, nano zinc oxide particles and nano silicon dioxide particles and meta-aramid fiber into a defibrator for defibration and beating to obtain meta-aramid fiber pulp doped with nano metal oxide.

3. The method for preparing a meta-aramid paper resistant to ultraviolet aging according to claim 1, characterized in that, Step S1 specifically comprises: adding nano titanium dioxide particles and nano zinc oxide particles with a mass ratio of 1:0.5-2 and meta-aramid fiber into a defibrator for defibration and beating to obtain meta-aramid fiber pulp doped with nano metal oxide.

4. The method for preparing a meta-aramid paper resistant to ultraviolet aging according to claim 1, characterized in that, Step S1 specifically comprises: adding nano metal oxide with anti-ultraviolet performance with a particle size of 30-100 nm and meta-aramid fiber into a defibrator for defibration and beating to obtain meta-aramid fiber pulp doped with nano metal oxide.

5. The method for preparing a meta-aramid paper resistant to ultraviolet aging according to claim 1, characterized in that, Step S1 specifically comprises: adding nano metal oxide with anti-ultraviolet performance and water after ultrasonic dispersion treatment and meta-aramid fiber into a defibrator for defibration and beating to obtain meta-aramid fiber pulp doped with nano metal oxide.

6. The method for preparing a meta-aramid paper resistant to ultraviolet aging according to claim 1, characterized in that, Step S1 specifically comprises: adding nano metal oxide with anti-ultraviolet performance and meta-aramid fiber into a defibrator for defibration and beating to obtain meta-aramid fiber pulp doped with nano metal oxide with a beating degree of 30°SR-80°SR and a defibration concentration of 0.1%-0.3%.

7. The method for preparing a meta-aramid paper resistant to ultraviolet aging according to claim 1, characterized in that, Step S2 specifically comprises: adding meta-aramid short fibers treated by a surface active agent with a length of 1 mm-10 mm and the meta-aramid fiber pulp doped with nano metal oxide into a sheet former, and sequentially performing papermaking, pressing and drying to obtain a meta-aramid paper.

8. The method for preparing a meta-aramid paper resistant to ultraviolet aging according to claim 1, characterized in that, Step S3 specifically comprises: hot pressing the meta-aramid paper by using a hot press at a temperature of 250-300°C, a pressure of 2-5 MPa and a roller speed of 5-15 m / min to obtain an anti-ultraviolet aging meta-aramid paper.

9. An ultraviolet-aging resistant meta-aramid paper, characterized by, An anti-ultraviolet aging meta-aramid paper prepared by the method of any one of claims 1-8.

10. The anti-ultraviolet aging meta-aramid paper of claim 9 is applied in the field of high-speed rail transportation, the field of aerospace or the field of electrical insulation.

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