CN111485446A - Enhanced aramid paper and preparation method thereof - Google Patents
Enhanced aramid paper and preparation method thereof Download PDFInfo
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- CN111485446A CN111485446A CN202010293217.1A CN202010293217A CN111485446A CN 111485446 A CN111485446 A CN 111485446A CN 202010293217 A CN202010293217 A CN 202010293217A CN 111485446 A CN111485446 A CN 111485446A
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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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
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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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
- D21H23/56—Rolls
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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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/78—Controlling or regulating not limited to any particular process or apparatus
-
- 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
Abstract
The invention belongs to the technical field of papermaking, and particularly relates to enhanced aramid paper and a preparation method thereof. The meta-position or para-position aramid raw paper manufactured by traditional chopped fibers and pulp or fibrid composite papermaking is prepared, then a compressed air controlled double-side extrusion coating machine is adopted to carry out sizing treatment on the aramid raw paper by the para-position aramid nano-fiber dispersion liquid, so that the paper formation uniformity is obviously increased, the aramid paper uniformity, the dielectric property and the mechanical strength are improved, the purposes of accurately controlling the liquid absorption rate, the glue holding distribution and the like of the aramid paper finished paper are achieved, and the negative influence of the introduction of a third adhesive on the paper performance is avoided.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to enhanced aramid paper and a preparation method thereof.
Background
In recent years, research and application of high-performance materials are rapidly developed, and aramid fibers are increasingly paid more attention as a novel synthetic fiber material with high strength, high modulus and high temperature resistance. The aramid paper prepared from the aramid fiber through a papermaking process has excellent dielectric property, mechanical property, high temperature resistance, chemical corrosion resistance and flexible designability, is widely applied to the fields of high-end insulation, aerospace, rail transit and the like, and is a key material for realizing ultrahigh-grade insulation, light weight and high speed. The high-performance aramid paper-based composite material obtained by combining the aramid paper and other resins is increasingly widely applied to the field of high-performance composite materials.
The high-performance aramid paper-based material (aramid paper) is a composite material which is prepared by taking chopped fibers as a reinforcement, pulp or fibrids as a matrix and adopting a modern papermaking wet papermaking and hot press molding process, has excellent insulating property, high strength, high modulus, light weight, high temperature resistance, flame retardance, corrosion resistance and electromagnetic wave transmission performance, can be used as a structural material, an insulating material and an electronic material, can be widely applied to the high-tech fields of aerospace, rail transit, electronics and electrics, defense industry and the like, and has a wide market prospect.
Compared with meta-aramid paper, the para-aramid paper has obvious advantages in the aspects of modulus, strength, thermal stability, moisture regain and the like, and particularly has great improvement in the aspects of compression modulus and shear modulus. In the case of the DuPont product, the KOREX @ paper honeycomb has a tensile strength of 1.6 times NOREX @ and a compressive and shear modulus of 2 and 2.7 times NOREX @ respectively, and a coefficient of thermal expansion of only 25% of NOREX @ and a moisture regain of less than 50% of NOREX @ is obtained. However, most of high-end aramid paper is still in a theoretical research stage at present, the technical capabilities of the fields of aramid pulp, fibrid and the like related to the core technology of the high-end aramid paper are still quite different from foreign technologies, the researched and reported properties of the aramid paper are close to those of the aramid paper of similar products of DuPont, the aramid paper only stays in a laboratory stage, the yield, the performance stability and the cost of the aramid paper are greatly different from those of the foreign high-end aramid paper products of DuPont, and particularly, the differences in the aspects of the uniformity, the density, the liquid absorption rate and the like of the paper are quite large, so that the industrialization of the high-end aramid paper is still great and far.
Disclosure of Invention
The invention aims to provide enhanced aramid paper and a preparation method thereof, wherein meta-position or para-position aramid base paper made by traditional chopped fibers and pulp or fibrids in a composite way is prepared, and then a compressed air controlled double-side extrusion coating machine is adopted to carry out sizing treatment on aramid base paper by using a para-position aramid nanofiber dispersion liquid, so that the paper forming evenness is obviously increased, the aramid paper uniformity, the dielectric property and the mechanical strength are improved, the purposes of accurately controlling the liquid absorption rate, the glue holding distribution and the like of the aramid paper forming paper are achieved, and the negative influence on the paper performance caused by introducing a third adhesive is avoided.
The technical scheme adopted by the invention is as follows:
the reinforced aramid paper comprises raw material components of a component A, a component B and para-aramid nano-fibers; according to the absolute dry weight of the fiber, the mass ratio of the component A to the component B is 10-50: 30-70 percent of para-aramid nano-fiber, wherein the weight of the para-aramid nano-fiber is 1-20 percent of the total weight of the component A and the component B.
The component A is para-position or meta-position aramid chopped fiber; the component B is meta-aramid pulp or para-aramid fibrid.
Preferably, the diameter of the para-aramid nanofiber is 10-200 nm.
Preferably, the length of the aramid chopped fiber is 5-10 mm, and the diameter of the aramid chopped fiber is 12-15 microns.
The preparation method of the reinforced aramid paper comprises the following steps:
1) mixing the component A and the component B according to the proportion, putting the mixture into a pulp preparation kettle, adding a wet strength agent, mixing pulp, adjusting the concentration of paper pulp to be 0.01-1%, adopting a conventional paper making process to make the prepared pulp on an inclined wire paper machine, and squeezing, drying and hot-pressing the pulp to obtain the aramid fiber base paper.
2) And dispersing the para-aramid nano-fiber into dispersion liquid by using deionized water, performing double-sided sizing on aramid base paper, uniformly distributing the amount of the double-sided sizing, and performing hot pressing to obtain the enhanced aramid paper.
Preferably, before the component A is prepared into slurry in the step 1), the treatment is carried out according to the following steps: washing and pretreating para-position or meta-position aramid chopped fibers by using a sodium dodecyl benzene sulfonate aqueous solution, and then cleaning by using clear water, wherein the pH is controlled to be 7-8; and then pulping the washed and pretreated aramid chopped fibers by using a groove type pulping machine, wherein the pulping concentration is controlled to be 0.01-1%, and fully dispersing fiber bundles into single fibers to prepare the aramid chopped fiber pulp.
Preferably, the volume-molar concentration of the sodium dodecyl benzene sulfonate aqueous solution is 0.5 × 10-3～1.5×10- 3mol/L。
Preferably, the temperature of the washing pretreatment of the aramid chopped fibers is 40-90 ℃, and the treatment time is 20-90 min.
Preferably, before the component B is blended in the step 1), the treatment is carried out according to the following steps: carrying out beating treatment on meta-aramid pulp or para-aramid fibrid by using a groove beater, wherein the beating concentration is 0.1-2%, and the beating degree is controlled at 20-60 DEG SR.
In the step 1), the wet strength agent is preferably polyepichlorohydrin resin, and the added mass is 0.1 percent of the mass of absolute dry aramid fiber; the mesh number of the manufactured filter screen is 100-300 meshes.
Squeezing, drying and hot pressing in the step 1) to obtain aramid raw paper, and specifically, the method is implemented according to the following steps: pressing under the pressure of 2-5 MPa; drying at the temperature of 80-120 ℃ for 3-10 min to obtain the aramid raw paper. The aramid raw paper is controlled to have certain compactness, so that the subsequent coating working section is facilitated.
The concentration of the para-aramid nano-fiber dispersion liquid in the step 2) is 0.1-5%, preferably 0.1-1%; the total gluing amount is controlled to be 1-20 percent;
preferably, the moisture content of the sized paper in the step 2) is controlled between 2 and 10 percent,
preferably, a compressed air-controlled double-sided extrusion coating machine is adopted to perform sizing treatment on the aramid fiber base paper by the para-aramid nano-fiber dispersion liquid.
And (3) performing hot pressing in the step 2), preferably performing high-temperature calendaring treatment, and performing hot pressing on a hot press, wherein the pressure is controlled to be 5-15 MPa, the hot pressing temperature is 100-300 ℃, and the hot pressing frequency is 1 time.
The method comprises the following steps of dispersing para-aramid nano-fiber, extruding and sizing, and drying to obtain aramid paper, and is specifically implemented according to the following steps:
adding deionized water into para-aramid nano-fiber (with the average diameter of 10-200 nm), stirring and dispersing to prepare 0.1-1% of dispersion liquid as a sizing material. The sizing treatment of the aramid fiber raw paper by the para-aramid nano-fiber dispersion liquid is carried out by adopting a compressed air controllable double-sided extrusion coating machine, the sizing amount is controlled to be 10-20 percent and the moisture of the finished paper is controlled to be 2-10 percent by controlling the pressure of a coating roller, the concentration of the dispersion liquid and the like. And carrying out hot pressing treatment on the base paper on a high-temperature hot press, controlling the pressure to be 5-15 MPa, controlling the hot pressing temperature to be 100-300 ℃, and carrying out hot pressing for 1 time to obtain the enhanced para-aramid finished paper.
The invention has the beneficial effects that:
the invention utilizes the sodium dodecyl benzene sulfonate aqueous solution to wash the aramid chopped fiber, can wash away residual organic solvent on the surface of the fiber and byproducts in the production process, reduce the hydrophobicity of the fiber and increase the dispersion compatibility with the aramid pulp or fibrid.
The aramid pulp or fibrid is beaten by a groove beater to fibrillate the aramid pulp or fibrid, and the fibrid is torn along the longitudinal direction to generate larger specific surface area and slender fiber shape and present a more uniform dispersion state, thereby being more beneficial to better contact with the chopped fiber and finally improving the paper evenness and physical strength.
The aramid paper made of the traditional aramid chopped fibers and pulp is subjected to sizing enhancement treatment by using the para-aramid nano-fiber dispersion liquid, so that the enhanced aramid paper with improved uniform density (directly improved dielectric property) and mechanical strength can be obtained. The para-aramid nano-fiber dispersion liquid is compounded on the traditional aramid paper in an extrusion sizing mode, so that the advantages of high strength and high modulus of macroscopic aramid fibers can be retained to the maximum extent, the characteristics of good compatibility and excellent filling effect of the nano-fibers can be exerted, gaps of paper sheets are filled, and acting force between the fibers is enhanced. The extrusion gluing mode is highly controllable, the glue holding amount and the glue holding distribution of the aramid base paper are improved, the distribution of the nano fibers in a skeleton structure formed by the aramid base paper is finally controlled by controlling the pressure of a coating roller, the concentration of dispersion liquid and the like, a pure aramid fiber composite material similar to reinforced concrete is formed, the indexes of the paper forming uniformity, the liquid absorption rate, the glue holding distribution and the like are accurately controlled, and the method is very suitable for being applied to industries such as high-end insulating paper, aviation-grade aramid paper honeycomb and the like with high requirements on factors such as the paper uniformity, the dielectric property, the mechanical property, the liquid absorption rate and the like, and has great pioneering significance. The technology avoids adding other bonding materials with lower comprehensive performance for adjusting the density, the liquid absorption rate and the comprehensive paper forming effect of the para-aramid paper, and effectively ensures the overall performance of the aramid paper.
In conclusion, the high-performance aramid paper is researched and produced by adopting a new process and a new method, is strong in innovation and wide in application prospect, and has great practical significance for promoting the development of high and new technology industries, promoting the upgrading and updating of the traditional industries, promoting the grade of products such as high-strength-resistant special paper and the like and promoting the development of related industries.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but it should not be construed that the scope of the above subject matter is limited to the following examples. All the technologies realized based on the above contents of the present invention belong to the scope of the present invention. Except as otherwise noted, the following examples were carried out using conventional techniques.
The compressive strength of the paper sample is tested by the GBT1408.1-2006 insulating material electrical strength test method part 1 under power frequency.
The para-aramid chopped fibers adopted in the following embodiments of the invention are commercially available aramid fibers, and the para-aramid nanofibers are prepared by the prior art, in particular by the patent technology of a preparation method of para-aramid nanofibers (application number 2015106244606).
Example 1
(1) The raw material of the base paper is prepared by using aramid chopped fiber (5mm) with the volume-molar concentration of 1.2 × 10-3And (2) washing and pretreating the sodium dodecyl benzene sulfonate aqueous solution with the mol/L temperature of 60 ℃ for 30min, then cleaning the mixture with clear water, and then pulping the aramid chopped fibers by using a groove type pulping machine, wherein the pulping concentration is 0.03 percent, so as to prepare the aramid chopped fiber pulp.
(2) And (3) beating the para-aramid pulp by using a groove beating machine, wherein the beating concentration is 1%, and the beating degree is 30 DEG SR.
(3) The raw materials treated in the steps (1) and (2) are dried by the weight percentage of 40%: 60 percent of the pulp is mixed, the pulp is placed into a pulp preparation kettle to adjust the pulp concentration to be 0.03 percent, and then the wet strength agent is added and mixed evenly by a stirrer. The wet strength agent is selected from polyepichlorohydrin resin, and the added mass is equivalent to 0.1 percent of the mass of the absolute dry aramid fiber.
(4) And (4) manufacturing the fiber slurry prepared in the step (3) into a wet paper sheet which is continuously and uniformly distributed by adopting an inclined net wet method, wherein the mesh number of a manufactured filter screen is 150 meshes.
(5) The wet paper sheet is separated from the forming wire section by vacuum suction and transferred to a press section for press dewatering. The moisture of the wet paper sheet is removed by adopting double-roller double-blanket three-way squeezing, and the squeezing pressure is 2.0MPa, 3.0MPa and 5.0MPa in sequence.
(6) And drying the squeezed paper sheet by using an electric heating roller at the temperature of 110 ℃ for 4min to obtain a dried aramid paper finished product.
(7) Adding deionized water into para-aramid nano-fibers (the average diameter is 10-200 nm), stirring and dispersing to prepare 0.4% of dispersion liquid as a sizing material.
(8) And (3) carrying out (7) sizing treatment on the aramid base paper by using the dispersion liquid by using a compressed air controllable double-sided extrusion coating machine, controlling the sizing amount to be 5% and controlling the moisture of finished paper to be 4% by controlling the pressure of a coating roller, the concentration of the dispersion liquid and the like, and thus obtaining the aramid finished paper with uniform coating.
(9) And (3) carrying out high-temperature calendaring treatment on the paper sample prepared in the step (8), and carrying out hot pressing on a hot press, wherein the pressure is controlled at 7MPa, the hot pressing temperature is 200 ℃, and the hot pressing frequency is 1 time, so that the reinforced aramid finished paper is obtained.
Example 2
(1) Preparing raw paper raw material, namely preparing chopped aramid fiber (6mm) with volume-mol concentration of 1.1 × 10-3And (2) washing and pretreating the sodium dodecyl benzene sulfonate aqueous solution with the mol/L temperature of 70 ℃ for 25min, then washing the obtained product with clear water, and pulping the aramid chopped fibers by using a groove type pulping machine, wherein the pulping concentration is 0.02 percent to prepare the aramid chopped fiber pulp.
(2) And (3) beating the para-aramid pulp by using a groove beating machine, wherein the beating concentration is 0.5%, and the beating degree is 25 DEG SR.
(3) The raw materials treated in the steps (1) and (2) are mixed according to the mass percentage ratio of 35%: 65 percent of the pulp is mixed, the pulp is placed into a pulp preparation kettle to adjust the pulp concentration to be 0.03 percent, and then the wet strength agent is added and mixed evenly by a stirrer. The wet strength agent is selected from polyepichlorohydrin resin, and the added mass is equivalent to 0.1 percent of the mass of the absolute dry aramid fiber.
(4) And (4) manufacturing the fiber slurry prepared in the step (3) into a wet paper sheet which is continuously and uniformly distributed by adopting an inclined net wet method, wherein the mesh number of a manufactured filter screen is 150 meshes.
(5) The wet paper sheet is separated from the forming wire section by vacuum suction and transferred to a press section for press dewatering. The moisture of the wet paper sheet is removed by adopting double-roller double-blanket three-way squeezing, and the squeezing pressure is 3.0MPa, 4.0MPa and 5.0MPa in sequence.
(6) And drying the squeezed paper sheet by using an electric heating roller at the temperature of 120 ℃ for 2min to obtain a dried aramid paper finished product.
(7) Adding deionized water into para-aramid nano-fibers (the average diameter is 10-200 nm), stirring and dispersing to prepare 0.5% dispersion liquid serving as a sizing material.
(8) And (3) carrying out (7) sizing treatment on the aramid base paper by using the dispersion liquid by using a compressed air controllable double-sided extrusion coating machine, controlling the sizing amount to be 10% and controlling the moisture of finished paper to be 4% by controlling the pressure of a coating roller, the concentration of the dispersion liquid and the like, and thus obtaining the aramid finished paper with uniform coating.
(9) And (3) carrying out high-temperature calendaring treatment on the paper sample prepared in the step (8), and carrying out hot pressing on a hot press, wherein the pressure is controlled to be 8MPa, the hot pressing temperature is 220 ℃, and the hot pressing times are 1 time, so that the reinforced aramid finished paper is obtained.
Example 3
(1) Preparing raw paper raw material, namely preparing chopped aramid fiber (7mm) with volume-mol concentration of 1.0 × 10-3And (2) washing and pretreating the sodium dodecyl benzene sulfonate aqueous solution with the mol/L temperature of 50 ℃ for 60min, then cleaning the mixture with clear water, and then pulping the aramid chopped fibers by using a groove type pulping machine, wherein the pulping concentration is 0.02 percent to prepare the aramid chopped fiber pulp.
(2) And (3) beating the para-aramid pulp by using a groove beating machine, wherein the beating concentration is 1.5%, and the beating degree is 38 DEG SR.
(3) The raw materials treated in the steps (1) and (2) are 30% by mass: 70 percent of the pulp is mixed, the pulp is placed into a pulp preparation kettle to adjust the pulp concentration to be 0.03 percent, and then the wet strength agent is added and mixed evenly by a stirrer. The wet strength agent is selected from polyepichlorohydrin resin, and the added mass is equivalent to 0.1 percent of the mass of the absolute dry aramid fiber.
(4) And (4) manufacturing the fiber slurry prepared in the step (3) into a wet paper sheet which is continuously and uniformly distributed by adopting an inclined net wet method, wherein the mesh number of a manufactured filter screen is 150 meshes.
(5) The wet paper sheet is separated from the forming wire section by vacuum suction and transferred to a press section for press dewatering. The moisture of the wet paper sheet is removed by adopting double-roller double-blanket three-way squeezing, and the squeezing pressure is 1.5MPa, 2.0MPa and 3.0MPa in sequence.
(6) And drying the squeezed paper sheet by using an electric heating roller at the temperature of 105 ℃ for 8min to obtain a dried aramid paper finished product.
(7) Adding deionized water into para-aramid nano-fibers (the average diameter is 10-200 nm), stirring and dispersing to prepare 0.7% dispersion liquid serving as a sizing material.
(8) And (3) carrying out (7) sizing treatment on the aramid base paper by using the dispersion liquid by using a compressed air controllable double-sided extrusion coating machine, controlling the sizing amount to be 15% and controlling the moisture of finished paper to be 4% by controlling the pressure of a coating roller, the concentration of the dispersion liquid and the like, and thus obtaining the aramid finished paper with uniform coating.
(9) And (3) carrying out high-temperature calendaring treatment on the paper sample prepared in the step (8), and carrying out hot pressing on a hot press, wherein the pressure is controlled at 12MPa, the hot pressing temperature is 250 ℃, and the hot pressing frequency is 1 time, so that the reinforced aramid finished paper is obtained.
Example 4
(1) Preparing raw paper raw material, namely preparing chopped aramid fiber (8mm) with volume-mol concentration of 1.2 × 10-3And (2) washing and pretreating the sodium dodecyl benzene sulfonate aqueous solution with the mol/L temperature of 55 ℃ for 45min, then washing the sodium dodecyl benzene sulfonate aqueous solution with clear water, and then pulping the aramid chopped fibers by using a groove type pulping machine, wherein the pulping concentration is 0.01 percent, so as to prepare the aramid chopped fiber pulp.
(2) And (3) beating the para-aramid pulp by using a groove beating machine, wherein the beating concentration is 1.8%, and the beating degree is 50 DEG SR.
(3) The raw materials treated in the steps (1) and (2) are 25% by mass: 75 percent of the pulp is mixed, the pulp is placed into a pulp preparation kettle to adjust the pulp concentration to be 0.03 percent, and then the wet strength agent is added and mixed evenly by a stirrer. The wet strength agent is selected from polyepichlorohydrin resin, and the added mass is equivalent to 0.1 percent of the mass of the absolute dry aramid fiber.
(4) And (4) manufacturing the fiber slurry prepared in the step (3) into a wet paper sheet which is continuously and uniformly distributed by adopting an inclined net wet method, wherein the mesh number of a manufactured filter screen is 150 meshes.
(5) The wet paper sheet is separated from the forming wire section by vacuum suction and transferred to a press section for press dewatering. The moisture of the wet paper sheet is removed by adopting double-roller double-blanket three-way squeezing, and the squeezing pressure is 1.0MPa, 2.5MPa and 4.0MPa in sequence.
(6) And drying the squeezed paper sheet by using an electric heating roller at the temperature of 115 ℃ for 3min to obtain a dried aramid paper finished product.
(7) Adding deionized water into para-aramid nano-fibers (the average diameter is 10-200 nm), stirring and dispersing to prepare 0.8% dispersion liquid serving as a sizing material.
(8) And (3) carrying out (7) sizing treatment on the aramid base paper by using the dispersion liquid by using a compressed air controllable double-sided extrusion coating machine, controlling the sizing amount to be 20% and controlling the moisture of finished paper to be 4% by controlling the pressure of a coating roller, the concentration of the dispersion liquid and the like, and thus obtaining the aramid finished paper with uniform coating.
(9) And (3) carrying out high-temperature calendaring treatment on the paper sample prepared in the step (8), and carrying out hot pressing on a hot press, wherein the pressure is controlled to be 15MPa, the hot pressing temperature is 280 ℃, and the hot pressing times are 1 time, so that the reinforced aramid finished paper is obtained.
The enhanced aramid fiber paper samples of the embodiments 1 to 4 of the invention are analyzed and detected in terms of physical properties and electrical insulating properties, and the adopted detection standards are as follows:
the quantitative determination of the paper sample adopts GB T451.2-2002 'determination of paper and paperboard quantitative';
the thickness of the paper sample is measured by GB T451.3-2002 paper and paperboard thickness;
the tensile strength and elongation of the paper sample are measured by GBT12914-2008 "paper and paperboard tensile strength measurement";
the tearing strength of the paper sample adopts GB/T455-2002 'determination of tearing strength of paper and paperboard';
and (3) detection results:
according to the detection data, various performance indexes of the reinforced aramid paper prepared by the method are higher than those of a common aramid paper base material, and the reinforced aramid paper is excellent in performance.
Claims (10)
1. The reinforced aramid paper is characterized in that raw material components of the reinforced aramid paper comprise a component A, a component B and para-aramid nano-fibers;
the component A is para-position or meta-position aramid chopped fiber; the component B is meta-aramid pulp or para-aramid fibrid.
2. The reinforced aramid paper as claimed in claim 1, wherein the mass ratio of component a to component B is 10-50: 30-70 percent of para-aramid nano-fiber, wherein the weight of the para-aramid nano-fiber is 1-20 percent of the total weight of the component A and the component B.
3. The reinforced aramid paper as claimed in claim 1, wherein the diameter of the para-aramid nanofiber is 10-200 nm; the aramid chopped fiber is 5-10 mm in length and 12-15 microns in diameter.
4. The method for preparing the reinforced aramid paper as claimed in claim 1, characterized by comprising the steps of:
1) mixing the component A and the component B according to a ratio, putting the mixture into a pulp preparation kettle, adding a wet strength agent, mixing pulp, adjusting the concentration of paper pulp to be 0.01-1%, adopting a conventional paper making process to make the prepared pulp on an inclined wire paper machine, and squeezing, drying and hot-pressing the pulp to obtain aramid raw paper;
2) and dispersing the para-aramid nano-fiber into dispersion liquid by using deionized water, performing double-sided sizing on aramid base paper, uniformly distributing the amount of the double-sided sizing, and performing hot pressing to obtain the enhanced aramid paper.
5. The method of producing reinforced aramid paper as claimed in claim 4,
before the component A is prepared into pulp in the step 1), the treatment is carried out according to the following steps: washing and pretreating para-position or meta-position aramid chopped fibers by using a sodium dodecyl benzene sulfonate aqueous solution, and then cleaning by using clear water, wherein the pH is controlled to be 7-8; then, pulping the washed and pretreated aramid chopped fibers by using a groove type pulping machine, wherein the pulping concentration is controlled to be 0.01-1%, and fully dispersing fiber bundles into single fibers to prepare aramid chopped fiber pulp;
before the component B is prepared into pulp in the step 1), the treatment is carried out according to the following steps: carrying out beating treatment on meta-aramid pulp or para-aramid fibrid by using a groove beater, wherein the beating concentration is 0.1-2%, and the beating degree is controlled at 20-60 DEG SR.
6. The method for preparing the reinforced aramid paper as claimed in claim 5, wherein the volume-molar concentration of the aqueous solution of sodium dodecylbenzenesulfonate is 0.5 × 10-3～1.5×10-3And the mol/L, the temperature of the washing pretreatment of the aramid chopped fibers is 40-90 ℃, and the treatment time is 20-90 min.
7. The method of producing reinforced aramid paper as claimed in claim 4,
in the step 1), polyepichlorohydrin resin is selected as the wet strength agent, and the added mass is equivalent to 0.1 percent of the mass of absolute dry aramid fiber; squeezing, drying and hot pressing in the step 1) to obtain aramid raw paper, and specifically, the method is implemented according to the following steps: pressing under the pressure of 2-5 MPa; drying at the temperature of 80-120 ℃ for 3-10 min to obtain the aramid raw paper.
8. The method of producing reinforced aramid paper as claimed in claim 4,
the concentration of the para-aramid nano-fiber dispersion liquid in the step 2) is 0.1-5%; the total gluing amount is controlled to be 1-20%.
9. The method of producing reinforced aramid paper as claimed in claim 4,
and (3) performing hot pressing in the step 2), preferably performing high-temperature calendaring treatment, and performing hot pressing on a hot press, wherein the pressure is controlled to be 5-15 MPa, the hot pressing temperature is 100-300 ℃, and the hot pressing frequency is 1 time.
10. The method of producing reinforced aramid paper as claimed in claim 4,
the method comprises the following steps of dispersing para-aramid nano-fiber, extruding and sizing, and drying to obtain aramid paper, and is specifically implemented according to the following steps:
adding deionized water into para-aramid nano-fiber, stirring and dispersing to prepare 0.1-1% of dispersion liquid as sizing material; the sizing treatment of the aramid fiber raw paper by the para-aramid nano-fiber dispersion liquid is carried out by adopting a compressed air controllable double-sided extrusion coating machine, the sizing amount is controlled to be 10-20 percent and the moisture of the finished paper is controlled to be 2-10 percent by controlling the pressure of a coating roller, the concentration of the dispersion liquid and the like.
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