CN113737567B - Low-cost high-performance aramid composite paper and preparation method and application thereof - Google Patents
Low-cost high-performance aramid composite paper and preparation method and application thereof Download PDFInfo
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- CN113737567B CN113737567B CN202110936038.XA CN202110936038A CN113737567B CN 113737567 B CN113737567 B CN 113737567B CN 202110936038 A CN202110936038 A CN 202110936038A CN 113737567 B CN113737567 B CN 113737567B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
- D21H11/18—Highly hydrated, swollen or fibrillatable fibres
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Abstract
The invention discloses low-cost high-performance aramid composite paper and a preparation method and application thereof. The preparation method comprises the following steps: (1) dispersing the chopped fibers into water for ultrasonic modification to obtain a chopped fiber dispersion liquid; adding the fibrid into water for defibering, and then adding sodium thiosulfate to obtain fibrid dispersion liquid; (2) mixing part of the chopped fiber dispersion liquid and the precipitated fiber dispersion liquid into suspension, and then preparing aramid fiber paper by wet papermaking; (3) mixing the rest part of the chopped fiber dispersion liquid and the nano-cellulose into a suspension, and then preparing chopped fiber/nano-cellulose paper by wet papermaking; (4) and carrying out composite molding on the aramid paper and the chopped fiber/nano-cellulose paper under a hot-pressing condition to obtain the low-cost high-performance aramid composite paper. The preparation method can reduce the preparation cost of the aramid paper-based material, reduce the thickness of the aramid paper-based material, keep higher mechanical strength of the aramid paper-based material and have excellent practical production value.
Description
Technical Field
The invention belongs to the field of preparation of special paper materials, and particularly relates to low-cost high-performance aramid composite paper and a preparation method and application thereof.
Background
Aramid fiber, also known as "aromatic polyamide fiber", is a novel special-purpose high-performance synthetic fiber developed and developed by the U.S. dupont company in the end of the last sixties of the century, and is primarily applied to the military field at first, and in recent years, aramid fiber has gradually become more and more widely applied to the civilian field as a fiber material with high technical content. The aramid paper inherits most excellent properties of aramid fiber, such as thermal stability, chemical corrosion resistance, high specific strength, flame retardant property, insulating property and the like, and has wide application in the fields of aerospace, sensors, electricity, energy chemical industry, special protection and the like. However, since the aramid chopped fibers have very smooth surfaces and poor chemical activity, it is difficult to uniformly disperse the aramid chopped fibers in an aqueous medium, and the aramid fibers have poor interweaving force between each other in a paper structure, so that it is difficult to obtain aramid paper having good uniformity and mechanical strength, and the pure aramid paper-based material has high preparation cost and low strength of low-basis-weight aramid paper, which greatly limits the application of the aramid paper.
The nano-cellulose is a nano-material prepared by using common cellulose as a raw material and adopting a mechanical method, a chemical method or a biological method, has the characteristics of wide source, low cost, good biocompatibility, reproducibility and the like, has the advantages of high crystallinity, high Young modulus, high thermal stability, low thermal expansion coefficient and the like, and has great potential of application in functionalized and high value-added products. In the field of polymers, compared with inorganic fillers, nanocellulose has various incomparable advantages in the aspects of tensile strength, specific surface area, Young modulus and the like, but because of small size, nanocellulose has certain defects in the aspect of paper forming performance, and is not ideal in the aspect of paper strength in particular.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a preparation method of low-cost high-performance aramid composite paper.
The invention also aims to provide the aramid composite paper with low cost and high performance prepared by the method.
The invention further aims to provide application of the low-cost high-performance aramid composite paper.
The purpose of the invention is realized by the following technical scheme:
a preparation method of low-cost high-performance aramid composite paper comprises the following steps:
(1) aramid fiber dispersion treatment: dispersing the chopped fibers into water, and performing ultrasonic modification treatment to obtain a chopped fiber dispersion liquid; adding the fibrid into water, defibering at 50 +/-5 ℃, adding sodium thiosulfate and stirring to obtain fibrid dispersion liquid;
(2) manufacturing aramid fiber paper: mixing part of the chopped fiber dispersion liquid obtained in the step (1) and the precipitated fiber dispersion liquid into suspension, then preparing aramid wet paper by wet papermaking, and then drying and controlling the moisture content of the paper to be within 10% to obtain the aramid paper;
(3) manufacturing the chopped fiber and nano-cellulose composite paper by paper making: mixing the remaining chopped fiber dispersion liquid obtained in the step (1) and nano-cellulose into a suspension, then preparing chopped fiber/nano-cellulose wet paper by wet papermaking, and then drying and controlling the moisture content of the paper within 10% to obtain chopped fiber/nano-cellulose paper;
(4) compounding paper: and (3) carrying out composite molding on the aramid paper prepared in the step (2) and the chopped fiber/nano cellulose paper prepared in the step (3) under a hot pressing condition to obtain the low-cost high-performance aramid composite paper.
Further, the ultrasonic conditions in step (1) are as follows: the power is 40KW, and the time is 30-60 min.
Further, the mass ratio of the chopped fibers to the water in the step (1) is 1: 10-20.
Still further, the mass ratio of the chopped fibers to the water in the step (1) is 1: 20.
Further, the mass ratio of the fibrid to the water in the step (1) is 1: 10-20.
Still further, the mass ratio of the fibrids to the water in the step (1) is 1: 10.
Further, the time for the untwining in the step (1) is 30min or more.
Further, the mass ratio of the sodium thiosulfate to the fibrid in the step (1) is 0.5-1: 10.
And (2) further, the mass ratio of the sodium thiosulfate to the fibrid in the step (1) is 0.6-1: 10.
Further, the stirring time in the step (1) is 10min or more.
Furthermore, the mass ratio of the chopped fibers to the fibrids in the suspension liquid in the step (2) is (6:4) - (8:2) (namely, the total of the chopped fibers and the fibrids is 100%, the proportion is (60% -80%): 40% -20%).
Still further, the mass ratio of the chopped fibers to the fibrids in the suspension in the step (2) is (6:4) - (7: 3).
Further, the quantitative amount of the aramid paper in the step (2) is 30-60 g/m 2 。
Still further, the quantitative amount of the aramid fiber paper in the step (2) is 30g/m 2 。
Further, the temperature of the drying in the step (2) is 100 + -5 ℃.
Further, the moisture content of the aramid paper in the step (2) is 5-10%.
Further, the size of the nanocellulose described in step (3) is 500nm or less.
Further, the nanocellulose described in step (3) can be prepared by one or more of mechanical method, chemical method or biological method.
Still further, the nano-cellulose in the step (3) is prepared by combining a biological enzymolysis method (cellulase) and a mechanical method (high-pressure homogenization).
Further, the nanocellulose in the step (3) is prepared by a mechanical method, and the specific steps are as follows: after the wood pulp raw material is subjected to dispersion and wetting treatment, circulating for 20 times by using a grinding machine under the condition that the clearance of a fluted disc is 100 mu m, and then circulating for 20 times by using a high-pressure homogenizer to prepare the wood pulp.
Furthermore, the mass ratio of the chopped fibers to the nano-cellulose in the suspension in the step (3) is (5:5) - (7:3) (namely, the total of the chopped fibers and the nano-cellulose is 100%, and the proportion is (50% -70%): 50% -30%).
Further, the quantitative ratio of the chopped fibers/nano-cellulose paper in the step (3) is 30-60 g/m 2 。
Still further, the quantitative ratio of the chopped fiber/nano cellulose paper in the step (3) is 30g/m 2 。
Further, the temperature of the drying in the step (3) is 80 + -5 ℃.
Further, the moisture content of the chopped fiber/nano cellulose paper in the step (2) is 3-8%.
Further, the conditions of the composite molding in the step (4) are as follows: the temperature is 220-250 ℃, the pressure is 1-5 MPa, and the time is 5-10 min.
Still further, the conditions of the composite molding in the step (4) are as follows: the temperature is 230 ℃, the pressure is 3MPa, and the time is 8 min.
The low-cost high-performance aramid composite paper is prepared by any one of the methods.
The low-cost high-performance aramid composite paper is applied to special paper materials.
Compared with the prior art, the invention has the following advantages and effects:
1. the nano-cellulose selected by the invention has the characteristics of wide source, low cost and the like, and part of nano-cellulose raw materials replace part of aramid fibers to form paper, so that the preparation cost of the aramid paper base material can be greatly reduced, the thickness of a sample can be reduced, the paper base material can keep higher mechanical strength (low quantitative and high strength), and the paper base material has excellent actual production value.
2. The invention adopts a paper composite hot pressing mode to better crosslink two paper types together, does not introduce other substances in the composite process, has simple operation and easy implementation, and is suitable for industrial production.
3. According to the invention, a period of drying treatment is carried out before hot-pressing compounding, so that a small amount of water is reserved in the paper, hydrogen bonding among fibers is facilitated, and the aramid fiber compound paper added with the nano-cellulose still has higher physical strength.
Drawings
Fig. 1 is a surface topography of aramid composite paper prepared by the present invention.
Fig. 2 is a microscopic structure view of the aramid composite paper prepared in the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated. The test methods in the following examples, in which specific experimental conditions are not specified, are generally performed according to conventional experimental conditions or according to the experimental conditions recommended by the manufacturer. Unless otherwise specified, reagents and starting materials for use in the invention are commercially available.
The chopped fibers and precipitated fibers involved in the examples of the present invention were purchased from Ganzhou Longbang materials science and technology, Inc.
The nano-cellulose (with the size less than 500 nm) related in the embodiment of the invention is prepared by a mechanical method, and the specific steps are as follows: the wood pulp is prepared by performing dispersion wetting treatment on a conventional commercially available wood pulp raw material, circulating the wood pulp raw material for 20 times by using a grinder under the condition that the clearance between fluted discs is 100um, and circulating the wood pulp raw material for 20 times by using a high-pressure homogenizer (Nanodebe micro-jet high-pressure homogenizer with the caliber model of D12).
The thickness, tensile strength, bursting strength, electrical strength, dielectric constant and dielectric loss factor of the paper related in the embodiment of the invention are carried out according to a national standard detection method and an industrial standard, and specifically comprise the following steps: thickness (GB/T20628.2-2006), tensile strength (GB/T453-.
Example 1
A preparation method of low-cost high-performance aramid composite paper comprises the following steps:
(1) dispersing 5g of chopped fibers in 100g of water solution, carrying out ultrasonic treatment for 30min in an environment with the ultrasonic power of 40kW, obtaining a chopped fiber dispersion liquid after the ultrasonic treatment is finished, and standing and storing; and (3) putting 5g of fibrid and 50g of water (50 ℃) into a fluffer for constant temperature fluffing for 30min, then adding 0.5g of sodium thiosulfate, stirring at normal temperature for 10min to obtain fibrid dispersion, and standing for storage.
(2) Mixing the obtained chopped fiber dispersion liquid and fibrid dispersion liquid in a fluffer according to the mass ratio of the chopped fibers to the fibrid of 6:4 for fluffing for 20min to prepare suspension, wherein the quantitative ratio is 30g/m 2 Wet papermaking to prepare wet aramid fiber paper, drying at 100 deg.c and controlling the water content in the paper to 7-10%.
(3) Preparing the chopped fiber dispersion liquid obtained in the step (1) and the nano-cellulose into a suspension according to the mass ratio of the chopped fibers to the nano-cellulose of 5:5, and quantitatively obtaining 30g/m 2 And preparing the chopped fiber/nano cellulose wet paper by wet papermaking, drying in an environment of 80 ℃, and controlling the moisture content of the dried paper to be 6-8%.
(4) And (3) carrying out composite hot-press molding on the paper obtained in the step (2) and the step (3) (the paper proportion is 1:1, namely the proportion of one piece of aramid paper to one piece of chopped fiber/nano cellulose paper is the same as below) for 8min under the hot-press conditions of 230 ℃ and 3MPa, and finally obtaining the low-cost high-performance aramid composite paper.
The thickness of the aramid composite paper corresponding to the embodiment is measured to be 0.091mm, and the tensile strength and the bursting strength of the aramid composite paper are respectively 2.86kN/m and 213 kPa; the electrical strength of the aramid composite paper is 12.4kV/mm, the dielectric constant (50Hz) is 1.54, and the dielectric loss factor (50Hz) is 0.79%.
Example 2
A preparation method of low-cost high-performance aramid composite paper comprises the following steps:
(1) dispersing 5g of chopped fibers in 100g of water solution, carrying out ultrasonic treatment for 40min in an environment with the ultrasonic power of 40kW to obtain a chopped fiber dispersion liquid after the ultrasonic treatment is finished, and standing and storing; and (3) putting 5g of fibrid and 50g of water (50 ℃) into a fluffer for constant temperature fluffing for 30min, then adding 0.4g of sodium thiosulfate, stirring at normal temperature for 10min to obtain fibrid dispersion, and standing for storage.
(2) Putting the obtained chopped fiber dispersion liquid and fibrid dispersion liquid into a fluffer according to the mass ratio of the chopped fibers to the fibrids of 6.5:3.5, mixing and fluffing for 20min to prepare suspension, wherein the quantitative ratio is 30g/m 2 Wet papermaking to prepare wet aramid fiber paper, drying at 100 deg.c and controlling the water content in the paper to 5-8%.
(3) Preparing the chopped fiber dispersion liquid obtained in the step (1) and the nano-cellulose into a suspension according to the mass ratio of 6:4 of the chopped fiber to the nano-cellulose, and quantitatively obtaining 30g/m 2 And preparing the chopped fiber/nano cellulose wet paper by wet papermaking, drying in an environment of 80 ℃, and controlling the moisture content of the dried paper to be below 3-7%.
(4) And (3) carrying out composite hot-press molding on the paper obtained in the step (2) and the step (3) for 6min under the hot-press conditions of 250 ℃ and 1MPa, and finally obtaining the aramid composite paper with low cost and high performance.
The surface appearance and microstructure of the aramid composite paper of this example are shown in fig. 1 and 2. The thickness of the aramid composite paper corresponding to the embodiment is measured to be 0.099mm, and the tensile strength and the bursting strength of the aramid composite paper are respectively 4.29kN/m and 242 kPa; the electrical strength of the aramid composite paper is 20.7kV/mm, the dielectric constant (50Hz) is 2.19, and the dielectric loss factor (50Hz) is 0.39%.
Example 3
A preparation method of low-cost high-performance aramid composite paper comprises the following steps:
(1) dispersing 5g of chopped fibers in 100g of water solution, carrying out ultrasonic treatment for 40min in an environment with the ultrasonic power of 40kW to obtain a chopped fiber dispersion liquid after the ultrasonic treatment is finished, and standing and storing; and (3) putting 5g of fibrid and 50g of water (50 ℃) into a fluffer for constant temperature fluffing for 30min, then adding 0.3g of sodium thiosulfate, stirring at normal temperature for 10min to obtain fibrid dispersion, and standing for storage.
(2) Mixing the obtained chopped fiber dispersion liquid and fibrid dispersion liquid in a fluffer according to the mass ratio of 7:3 of chopped fibers and fibrids for defibering for 20min to prepare suspension, wherein the quantitative ratio is 30g/m 2 Wet papermaking to prepare wet aramid fiber paper, drying at 100 deg.c and controlling the water content in the paper to 8-10%.
(3) Preparing the chopped fiber dispersion liquid obtained in the step (1) and the nano-cellulose into a suspension according to the mass ratio of 6:4 of the chopped fiber to the nano-cellulose, and quantitatively obtaining 30g/m 2 And preparing the chopped fiber/nano cellulose wet paper by wet papermaking, drying in an environment of 80 ℃, and controlling the moisture content of the dried paper to be 3-8%.
(4) And (4) carrying out composite hot-press molding on the paper obtained in the steps (2) and (3) for 10min under the hot-press conditions of 250 ℃ and 1MPa, and finally obtaining the low-cost high-performance aramid composite paper.
The thickness of the aramid composite paper corresponding to the embodiment is measured to be 0.103mm, and the tensile strength and the bursting strength of the aramid composite paper are respectively 3.83kN/m and 224 kPa; the electrical strength of the aramid composite paper is 18.60kV/mm, the dielectric constant (50Hz) is 1.87, and the dielectric loss factor (50Hz) is 0.53%.
Example 4
A preparation method of low-cost high-performance aramid composite paper comprises the following steps:
(1) dispersing 5g of chopped fibers in 100g of water solution, carrying out ultrasonic treatment for 40min in an environment with the ultrasonic power of 40kW to obtain a chopped fiber dispersion liquid after the ultrasonic treatment is finished, and standing and storing; and (3) putting 5g of fibrid and 50g of water (50 ℃) into a fluffer for constant temperature fluffing for 30min, then adding 0.5g of sodium thiosulfate, stirring at normal temperature for 10min to obtain fibrid dispersion, and standing for storage.
(2) Mixing the obtained chopped fiber dispersion liquid and fibrid dispersion liquid in a fluffer according to the mass ratio of 7:3 of chopped fibers and fibrids for defibering for 20min to prepare suspensionAt a quantitative rate of 30g/m 2 Wet papermaking to prepare wet aramid fiber paper, drying at 100 deg.c and controlling the water content in the paper to 5-7%.
(3) Preparing the chopped fiber dispersion liquid obtained in the step (1) and nano-cellulose into a suspension according to the mass ratio of 5:5 of chopped fibers to nano-cellulose, and quantitatively setting the suspension to be 30g/m 2 And preparing the chopped fiber/nano cellulose wet paper by wet papermaking, drying in an environment of 80 ℃, and controlling the moisture content of the dried paper to be 3-8%.
(4) And (3) carrying out composite hot-press molding on the paper obtained in the step (2) and the step (3) for 8min under the hot-press conditions of 250 ℃ and 5MPa to finally obtain the aramid composite paper with low cost and high performance.
The thickness of the aramid composite paper corresponding to the embodiment is measured to be 0.096mm, and the tensile strength and the burst strength of the aramid composite paper are respectively 3.41kN/m and 256 kPa; the electrical strength of the aramid composite paper is 15.80kV/mm, the dielectric constant (50Hz) is 1.63, and the dielectric loss factor (50Hz) is 0.72%.
Example 5
A preparation method of low-cost high-performance aramid composite paper comprises the following steps:
(1) dispersing 5g of chopped fibers in 100g of water solution, carrying out ultrasonic treatment for 60min in an environment with ultrasonic power of 40KW to obtain a chopped fiber dispersion liquid after the ultrasonic treatment is finished, and standing and storing; and (3) putting 5g of fibrid and 50g of water (50 ℃) into a fluffer for constant temperature fluffing for 30min, then adding 0.5g of sodium thiosulfate, stirring at normal temperature for 10min to obtain fibrid dispersion, and standing for storage.
(2) Mixing the obtained chopped fiber dispersion liquid and fibrid dispersion liquid in a fluffer according to the mass ratio of the chopped fibers to the fibrid of 6:4 for fluffing for 20min to prepare suspension, wherein the quantitative ratio is 30g/m 2 Wet papermaking to prepare wet aramid fiber paper, drying at 100 deg.c and controlling the water content in the dried paper to 6-9%.
(3) Mixing the chopped fiber dispersion liquid obtained in the step (1) and nano-cellulose according to the mass ratio of 7:3 of the chopped fiber to the nano-cellulosePreparing into suspension with a quantitative ratio of 30g/m 2 And preparing the chopped fiber/nano cellulose wet paper by wet papermaking, drying in an environment of 80 ℃, and controlling the moisture content of the dried paper to be 4-8%.
(4) And (3) carrying out composite hot-press molding on the paper obtained in the step (2) and the step (3) for 8min under the hot-press conditions of the temperature of 220 ℃ and the pressure of 5MPa, and finally obtaining the aramid composite paper with low cost and high performance.
The thickness of the aramid composite paper corresponding to the embodiment is measured to be 0.086mm, and the tensile strength and the bursting strength of the aramid composite paper are respectively 2.39kN/m and 231 kPa; the electrical strength of the aramid composite paper is 12.1kV/mm, the dielectric constant (50Hz) is 1.42, and the dielectric loss factor (50Hz) is 0.81%.
Comparative example 1
A preparation method of aramid composite paper comprises the following steps:
(1) dispersing 5g of chopped fibers in 100g of water solution, carrying out ultrasonic treatment for 30min in an environment with the ultrasonic power of 40kW, obtaining a chopped fiber dispersion liquid after the ultrasonic treatment is finished, and standing and storing; and (3) putting 5g of fibrid and 50g of water (50 ℃) into a fluffer for constant temperature fluffing for 30min, then adding 0.5g of sodium thiosulfate, stirring at normal temperature for 10min to obtain fibrid dispersion, and standing for storage.
(2) Mixing the obtained chopped fiber dispersion liquid and fibrid dispersion liquid in a fluffer according to the mass ratio of the chopped fibers to the fibrid of 6:4 for fluffing for 20min to prepare suspension, wherein the quantitative ratio is 60g/m 2 Wet paper making to prepare aramid wet paper, drying the aramid wet paper in an environment of 100 ℃, and controlling the moisture content of the dried paper to be within 10 percent.
(3) And (3) carrying out composite hot-press molding on the paper obtained in the step (2) for 8min under the hot-press conditions of 230 ℃ and 3MPa to finally obtain the aramid composite paper.
The thickness of the aramid composite paper corresponding to the comparative example 1 is measured to be 0.134mm, and the tensile strength and the burst strength of the aramid composite paper are respectively 2.06kN/m and 198 kPa; the electrical strength of the aramid composite paper is 12.6kV/mm, the dielectric constant (50Hz) is 1.46, and the dielectric loss factor (50Hz) is 0.67%.
Comparative example 2
A preparation method of aramid composite paper comprises the following steps:
(1) dispersing 5g of chopped fibers in 100g of water solution, carrying out ultrasonic treatment for 30min in an environment with the ultrasonic power of 40kW, obtaining a chopped fiber dispersion liquid after the ultrasonic treatment is finished, and standing and storing.
(2) Preparing the chopped fiber dispersion liquid obtained in the step (1) and the nano-cellulose into a suspension according to the mass ratio of 5:5 of the chopped fiber to the nano-cellulose, and quantitatively obtaining 60g/m 2 And preparing the chopped fiber/nano cellulose wet paper by wet papermaking, drying in an environment of 80 ℃, and controlling the moisture content of the dried paper within 10 percent.
(3) And (3) carrying out composite hot-press molding on the paper obtained in the step (2) for 8min under the hot-press conditions of 230 ℃ and 3MPa to finally obtain the aramid composite paper.
The thickness of the aramid composite paper corresponding to the comparative example 2 is measured to be 0.082mm, and the tensile strength and the bursting strength of the aramid composite paper are respectively 2.12kN/m and 214 kPa; the electrical strength of the aramid composite paper is 7.2kV/mm, the dielectric constant (50Hz) is 0.99, and the dielectric loss factor (50Hz) is 0.98%.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.
Claims (8)
1. The preparation method of the low-cost high-performance aramid composite paper is characterized by comprising the following steps of:
(1) dispersing aramid fibers: dispersing the chopped fibers into water, and performing ultrasonic modification treatment to obtain a chopped fiber dispersion liquid; adding the fibrid into water, defibering at 50 +/-5 ℃, adding sodium thiosulfate and stirring to obtain fibrid dispersion liquid;
(2) manufacturing aramid fiber paper: mixing part of the chopped fiber dispersion liquid obtained in the step (1) and fibrid dispersion liquid into suspension, then preparing aramid wet paper by wet papermaking, and then drying and controlling the moisture content of the paper to be within 10% to obtain the aramid paper;
(3) manufacturing the chopped fiber and nano-cellulose composite paper by paper making: mixing the remaining chopped fiber dispersion liquid obtained in the step (1) and nano-cellulose into a suspension, then preparing chopped fiber/nano-cellulose wet paper by wet papermaking, and then drying and controlling the moisture content of the paper within 10% to obtain chopped fiber/nano-cellulose paper;
(4) compounding paper: carrying out composite molding on the aramid paper prepared in the step (2) and the chopped fiber/nano cellulose paper prepared in the step (3) under a hot pressing condition to obtain low-cost high-performance aramid composite paper;
the ultrasonic conditions in the step (1) are as follows: the power is 40KW, and the time is 30-60 min;
the mass ratio of the sodium thiosulfate to the fibrid in the step (1) is 0.5-1: 10;
the mass ratio of the chopped fibers to the fibrids in the suspension liquid in the step (2) is 6: 4-8: 2;
the nano-cellulose in the step (3) is prepared by a mechanical method, and the specific steps are as follows: after the wood pulp raw material is subjected to dispersion and wetting treatment, circulating for 20 times by using a grinder under the condition that the clearance of a fluted disc is 100 mu m, and then circulating for 20 times by using a high-pressure homogenizer to prepare the wood pulp;
the size of the nano-cellulose in the step (3) is less than 500 nm;
the mass ratio of the chopped fibers to the nano-cellulose in the suspension in the step (3) is 5: 5-7: 3;
the conditions of the composite molding in the step (4) are as follows: the temperature is 220-250 ℃, the pressure is 1-5 MPa, and the time is 5-10 min.
2. The preparation method of the low-cost high-performance aramid composite paper according to claim 1, characterized by comprising the following steps:
the mass ratio of the chopped fibers to the fibrids in the suspension liquid in the step (2) is 6: 4-7: 3.
3. The preparation method of the low-cost high-performance aramid composite paper according to claim 1, characterized by comprising the following steps:
the conditions of the composite molding in the step (4) are as follows: the temperature is 230 ℃, the pressure is 3MPa, and the time is 8 min.
4. The preparation method of the low-cost high-performance aramid composite paper according to claim 1, characterized by comprising the following steps:
the mass ratio of the chopped fibers to water in the step (1) is 1: 10-20;
the mass ratio of the fibrid to the water in the step (1) is 1: 10-20;
the quantitative ratio of the aramid paper in the step (2) is 30-60 g/m 2 ；
The water content of the aramid paper in the step (2) is 5-10%;
the quantitative ratio of the chopped fibers/the nano-cellulose paper in the step (3) is 30-60 g/m 2 ；
And (4) the moisture content of the chopped fibers/nano cellulose paper in the step (3) is 3-8%.
5. The preparation method of the low-cost high-performance aramid composite paper according to claim 4, characterized by comprising the following steps:
the mass ratio of the chopped fibers to the water in the step (1) is 1: 20;
the mass ratio of the fibrid to the water in the step (1) is 1: 10;
the mass ratio of the sodium thiosulfate to the fibrid in the step (1) is 0.6-1: 10;
the quantitative amount of the aramid paper in the step (2) is 30g/m 2 ；
The quantitative ratio of the chopped fibers/the nano-cellulose paper in the step (3) is 30g/m 2 。
6. The preparation method of the low-cost high-performance aramid composite paper according to claim 1, characterized by comprising the following steps:
the time for defibering in the step (1) is more than 30 min;
the stirring time in the step (1) is more than 10 min;
the drying temperature in the step (2) is 100 +/-5 ℃;
the drying temperature in the step (3) is 80 +/-5 ℃.
7. The low-cost high-performance aramid composite paper is characterized in that: prepared by the method of any one of claims 1 to 6.
8. Use of the low-cost high-performance aramid composite paper as claimed in claim 7 in specialty paper materials.
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| CN112663382A (en) * | 2020-12-01 | 2021-04-16 | 华南理工大学 | High-mechanical-strength aramid fiber insulating paper and preparation method and application thereof |
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| US20140186576A1 (en) * | 2012-12-28 | 2014-07-03 | E I Du Pont De Nemours And Company | Insulating material containing nanocellulose |
| CN108316056A (en) * | 2018-02-11 | 2018-07-24 | 陕西科技大学 | A kind of aramid nano-fiber Film laminated aramid paper and preparation method thereof |
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