CN110939008A - Method for manufacturing meta-aramid raw paper with high insulation performance - Google Patents
Method for manufacturing meta-aramid raw paper with high insulation performance Download PDFInfo
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- 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
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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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
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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
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
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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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Abstract
A method for manufacturing meta-aramid base paper with high insulation performance adopts meta-aramid chopped fibers and meta-aramid fibrids as raw materials, and prepares the meta-aramid base paper by defibering and mixing the meta-aramid chopped fibers and the meta-aramid fibrids according to a ratio and net surfing and forming, and is characterized in that: the meta-aramid fibrid is high-pulp fibrid, and the meta-aramid fibrid is subjected to beating treatment to form SR with the beating degree of 65-95 degrees and the specific surface area of 60m2High-pulp fibrid above/g; the upper wire forming is a long wire forming process adopting high-speed pulp flowingAnd (4) forming. According to the invention, the beating degree and the specific surface area of the meta-aramid fibrid are improved, and the long-net forming process of high-speed pulp flow is adopted for forming, so that the high insulation performance of the manufactured aramid base paper is effectively improved, the electrical strength of the base paper is more than 12kV/mm, the electrical strength of the base paper after hot pressing can reach more than 30kV/mm, and the meta-aramid fibrid fully has the capability of long-term safe and stable operation in the electric field environment of a high-voltage motor or a transformer.
Description
Technical Field
The invention relates to a manufacturing method of aramid paper, in particular to a manufacturing method of high-insulation-performance meta-aramid base paper.
Background
Meta-aramid paper belongs to one of aramid fiber papers, and the meta-aramid fiber becomes one of high-quality functional fibers due to excellent high-temperature-resistant insulating property; the meta-aramid paper has the most outstanding characteristics of high temperature resistance, long-term use at a high temperature of 220 ℃ without aging, 10-year long-term maintenance of electrical performance and mechanical performance, excellent dimensional stability and only 1% of thermal shrinkage at about 250 ℃; the paint does not shrink, embrittle, soften or melt after being exposed to high temperature of 300 ℃ for a short time; decomposition is started at a strong temperature exceeding 370 ℃; the carbonization is started at about 400 ℃, and the high thermal stability is rare in the prior organic temperature-resistant fiber.
Because the meta-aramid insulation paper is mainly prepared from aramid chopped fibers and fibrids according to a certain proportion, according to the knowledge of common technical personnel, the paper prepared from the chemical fibers is most suitable to be prepared by adopting cylinder forming or inclined wire forming and is also the forming with the lowest costIn the mode, the prior production method of the meta-aramid insulating paper mainly adopts a rotary screen or inclined screen for forming and manufacturing; however, in the practical use process, the fact that the meta-aramid insulation paper made of the round net or the inclined net is weak in dewatering capacity and cannot be produced by high-pulp-degree fibrid with large specific surface area is found, so that when the aramid paper made of the round net or the inclined net is made of the aramid paper, the beating degree is controlled to be 30-60 DEG SR, and the specific surface area is 30m2Within/g; the meta-aramid insulation paper manufactured in the way is not high in electrical strength, the base paper is usually below 10kV/mm, the hot-pressed paper is usually only below 20kV/mm, and the use requirements of the existing high-voltage-grade motor or transformer cannot be met; therefore, for the meta-aramid base paper with high insulation performance, which has higher and higher insulation performance requirements, the original generally-considered cylinder mould or inclined mould forming mode is difficult to achieve, and the meta-aramid base paper needs to be improved.
Patent documents in which the same technology as that of the present invention is not found through patent search are reported, and the following patents which have a certain relationship with the present invention are mainly included:
1. the patent number is CN201410542672.5, the name is "a preparation method of meta-aramid paper", the applicant is: the invention patent of China Haicheng engineering science and technology Co., Ltd discloses a preparation method of meta-aramid paper, which comprises the following specific steps: defibering aramid chopped fibers by a hydrapulper and then by a high-frequency defibering machine to obtain aramid chopped fiber pulp for later use; adding aramid fibrid into a hydraulic pulper to disperse the aramid fibrid into aramid fibrid slurry; firstly defibering aramid fibrid slurry by a hydrapulper, and then screening the slurry by a centrifugal pulp screening machine to obtain slurry passing through a screen and fibrid not passing through the screen; mixing the pulp passing through the screen mesh with the defibered aramid chopped fiber pulp obtained in the step 1 to obtain mixed pulp; and (3) directly making the mixed slurry by netting without adding an auxiliary agent, squeezing, dehydrating and drying to obtain base paper, and carrying out hot pressing to obtain the meta-aramid paper.
2. The patent number is CN200910216913.6, and the name is 'slurry used for preparing meta-aramid paper, a production method, meta-aramid paper prepared by the slurry and the production method', the application is: the invention patent of the special paper industry of the Titai Meishida, Nitai Spandex group, Inc. discloses a method for preparing meta-aramid paper, which sequentially comprises the following steps: forming the slurry on a net, squeezing, drying and performing high-temperature press polish treatment; in the slurry on-line forming process, a special inclined net former inclined net forming technology is selected in the on-line forming procedure, a pressure screen is used for screening, and good slurry on-line is reserved; the ratio of the pulp speed to the wire speed is 0.96-1.02: 1; the concentration of the on-line is 0.01-0.05%; the squeezing and drying processes are as follows in sequence: firstly, the squeezing procedure adopts double-roller double-blanket one-pass squeezing dehydration, and the pressure of a squeezing line is 80-120 kN/m; secondly, the drying procedure is drying by a contact type drying net auxiliary drying cylinder, the drying temperature is 80-115 ℃, and the drying time is 0.5-2 minutes; in the high-temperature calendaring treatment process, the high-temperature calendaring working temperature is 200-380 ℃, and the hot-press forming is carried out under the condition of 100-350 kN/m line pressure.
3. The patent number is CN201310233648.9, the name is "a high physical strength insulating meta-aramid paper and a preparation method and application thereof", the applicant is: the invention discloses meta-aramid paper with high physical strength and insulativity, and a preparation method and application thereof. The method comprises the following operation steps: (1) performing composite beating treatment on 1313 aramid chopped fibers and 1313 aramid fibrids respectively, wherein the beating concentration of the 1313 aramid chopped fibers is 6-24% by mass, and the beating concentration of the 1313 aramid fibrids is 4-15% by mass; (2) respectively carrying out low-concentration defibering on the 1313 aramid chopped fibers, the 1313 aramid fibrids and the 1313 aramid pulp after the composite beating treatment by adopting low-concentration hydraulic pulping equipment; the mass percent concentration of the low-concentration defibering of the 1313 aramid chopped fibers is 0.1-1%, the mass percent concentration of the low-concentration defibering of the 1313 aramid fibrids is 0.5-2.5%, and the mass percent concentration of the low-concentration defibering of the 1313 aramid pulp is 0.5-1.5%; (3) removing flocculent pulp aggregates from the low-concentration defibered 1313 aramid chopped fibers, 1313 aramid fibrids and 1313 aramid pulp slurry through a slag separator and a rotor screen at a concentration of 0.3-0.8% by mass respectively to obtain a chopped fiber dispersion liquid, a fibrid dispersion liquid and a pulp dispersion liquid; and (3) drying the chopped fiber dispersion liquid, the precipitated fiber dispersion liquid and the pulp dispersion liquid according to the absolute dry mass ratio of the chopped fiber dispersion liquid to the precipitated fiber dispersion liquid to the pulp dispersion liquid (5-7): (2-4): (1-2) mixing and diluting to obtain slurry; (4) and (4) carrying out net-loading forming on the slurry obtained in the step (3), and carrying out squeezing, drying and hot-press forming treatment to obtain the high-physical-strength meta-aramid paper. The patent emphasizes that the initial beating degree of the 1313 aramid fibrids is 45-48 DEG SR, and the beating degree is increased to 52-56 DEG SR after composite beating; the beating degree of the 1313 aramid pulp is 55-58 DEG SR.
Through careful analysis of the patents, although the patents relate to the manufacturing method of the aramid fiber paper and also provide some improved technical schemes, the invention patent with the patent number of CN201310233648.9 also provides the meta-aramid fiber paper with high physical strength insulation and the preparation method thereof, through careful analysis, the patents still adopt the mode that the beating degree is controlled to be 30-60 DEG SR, and the specific surface area is 30m2The manufacturing method of the base paper within/g still provides the inclined wire forming technology which preferentially adopts a special inclined wire former; patent No. CN201310233648.9 proposes that "fourdrinier wire, inclined wire or cylinder wire is used for the upper wire forming", but it is not suitable for the fourdrinier wire forming process according to the beating degree and specific surface area of the proposed slurry, so the problems mentioned above still occur in the practical application process, and further research and improvement are needed.
Disclosure of Invention
The invention aims to solve the problems that in the existing process for manufacturing meta-aramid raw paper, a rotary screen or an inclined screen is generally adopted to manufacture the meta-aramid raw paper, the beating degree is controlled to be 30-60 DEG SR, and the specific surface area is 30m2Within/g, the insulation performance of the prepared meta-aramid base paper is usually below 10kV/mm, and the insulation performance of the hot-pressed paper is usually only below 20kV/mm, which cannot meet the use requirements of the current high-voltage motor or transformer. In order to overcome the defects, a novel method for manufacturing meta-aramid base paper is provided, and the meta-aramid raw paper manufactured by the novel method for manufacturing meta-aramid base paper isThe paper insulation performance is more than 12kV/mm, the electric strength after hot pressing can reach more than 30kV/mm, and the paper insulation material completely has the capability of long-term safe and stable operation in the electric field environment of a high-voltage-level motor or transformer.
In order to achieve the purpose, the invention provides a method for manufacturing meta-aramid base paper with high insulation performance, which comprises the steps of taking meta-aramid chopped fibers and meta-aramid fibrids as raw materials, defibering and mixing the meta-aramid chopped fibers and the meta-aramid fibrids according to a ratio, then carrying out net surfing forming to prepare the meta-aramid base paper, wherein the meta-aramid fibrids are high-pulp-degree fibrids, and carrying out pulping treatment on the meta-aramid fibrids to form SR with the pulp degree of 65-95 degrees and the specific surface area of 60m2High-pulp fibrid above/g; the upper wire forming is formed by adopting a long wire forming process of high-speed pulp flow.
Further, the pulping treatment of the meta-aramid fibrid comprises the steps of adding the meta-aramid fibrid into a hydraulic pulper to disperse the meta-aramid fibrid into meta-aramid fibrid pulp, then defibering the meta-aramid fibrid pulp by a groove type beater or a high-frequency defibering machine, and controlling the beating degree of the fibrid to be 65-95 DEG SR and the specific surface area to be 60m by beating2And (2) screening the pulp by a centrifugal pulp screening machine to obtain the high-pulp-degree fibrid.
Further, the pulp screening by a centrifugal pulp screening machine is to screen the aramid pulp obtained after beating and defibering the fibrids to obtain pulp passing through a screen and fibrids not passing through the screen; the slurry passing through the screen mesh has a beating degree of 65-95 DEG SR and a specific surface area of 60m2High-pulp fibrid with a specific weight/g or more.
Furthermore, the forming process of the fourdrinier wire by adopting high-speed pulp flow is to defiber and mix the meta-aramid chopped fiber and the meta-aramid fibrid according to the proportion to obtain aramid mixed slurry; and directly feeding the mixed slurry into long-net papermaking equipment, and performing net-surfing papermaking, squeezing dehydration and drying by adopting a high-speed pulp flowing process to obtain the aramid raw paper.
Further, the high-speed pulp flow is formed by pumping aramid fiber mixed pulp into a flow paddle box in fourdrinier papermaking equipment, and the flow paddle amount of the flow paddle box is controlled to 3000-20000L/min.
Furthermore, the dewatering area of the fourdrinier wire forming process of the high-speed pulp flow is more than 15 meters so as to ensure the dewatering of the high-pulp fibrids.
Further, the manufacturing process of the meta-aramid base paper comprises the following specific steps:
step 1: adding meta-aramid fibrid into a hydraulic pulper and dispersing into meta-aramid fibrid slurry;
step 2: firstly, defibering aramid fibrid slurry by a groove type beater or a high-frequency defibering machine, and controlling the beating degree of fibrid to be 65-95 DEG SR and the specific surface area to be 60m by beating2More than g;
and step 3: then, the slurry is sieved by a centrifugal slurry sieving machine to obtain the slurry with the beating degree of 65-95 DEG SR and the specific surface area of 60m2High-pulp fibrid above/g;
and 4, step 4: mixing the high-pulp-degree precipitation fiber passing through the screen pulp and the aramid chopped fiber according to a ratio, and fully dispersing and stirring to obtain mixed pulp;
and 5: and (3) directly adopting a long-wire forming process of high-speed pulp flow to carry out net-surfing papermaking, squeezing, dewatering and drying on the mixed slurry to obtain the meta-aramid raw paper.
The invention has the advantages that:
according to the invention, through improving the beating degree and the specific surface area of the meta-aramid fibrid and adopting the long-net forming process of high-speed pulp flow for forming, the fibrid has large adsorbability and better wrapping property on chopped fibers, so that the number of holes of the base paper is reduced, and the prepared aramid paper has a compact integral structure, no obvious holes, and is not easy to invade moisture and regain moisture. The high insulation performance of the prepared aramid base paper is effectively improved, the electrical strength of the base paper is more than 12kV/mm, the electrical strength after hot pressing can reach more than 30kV/mm, and the aramid base paper completely has the capability of long-term safe and stable operation in the electric field environment of a high-voltage-class motor or transformer.
Detailed Description
The invention will be further illustrated with reference to specific examples.
Example one
A method for manufacturing meta-aramid base paper with high insulation performance adopts meta-aramid chopped fibers and meta-aramid fibrids as raw materials, wherein:
the length of the meta-aramid chopped fiber is 4-6mm, and the fineness is 2-3D: the weight component is 35-55% of the absolute dry weight of the slurry;
the meta-aramid fibrid has a beating degree of 65-95 DEG SR and a specific surface area of 60m2High-pulp fibrid above/g; the weight component is 45-65% of the absolute dry weight of the slurry;
the high-pulp-degree fibrid is formed by pulping meta-aramid fibrid; beating meta-aramid fibrid to obtain aramid fibrid pulp, defibering the aramid fibrid pulp by a groove type beater, beating by the groove type beater, and controlling the beating degree of the fibrid to be 65-95 DEG SR and the specific surface area to be 60m2And (2) screening the pulp by a centrifugal pulp screening machine to obtain the high-pulp-degree fibrid.
The pulp screening through a centrifugal pulp screening machine is to screen the aramid pulp obtained after beating and defibering the fibrids to obtain pulp passing through a screen and fibrids not passing through the screen; the slurry passing through the screen mesh has a beating degree of 65-95 DEG SR and a specific surface area of 60m2High-pulp fibrid with a specific weight/g or more.
The meta-aramid chopped fibers and the meta-aramid fibrids are fluffed and mixed according to the proportion, and then are molded by netting to prepare the meta-aramid base paper; the upper wire forming is formed by adopting a long wire forming process of high-speed pulp flow.
The forming process of the fourdrinier wire by adopting high-speed pulp flow is characterized in that meta-aramid chopped fibers and meta-aramid fibrids are subjected to defibering and mixing according to a ratio to obtain aramid fiber mixed slurry; and directly feeding the mixed slurry into long-net papermaking equipment, and performing net-surfing papermaking, squeezing dehydration and drying by adopting a high-speed pulp flowing process to obtain the aramid raw paper.
The high-speed pulp flow is characterized in that aramid fiber mixed pulp is pumped into a flow paddle box in fourdrinier papermaking equipment, and the flow paddle amount of the flow paddle box is controlled to be 12000L/min.
The dewatering zone of the fourdrinier wire forming process of the high-speed pulp flow is 18 meters, so that the dewatering of the high-pulp fibrids is ensured.
The manufacturing process of the meta-aramid raw paper comprises the following specific steps:
step 1: adding meta-aramid fibrid into a hydraulic pulper and dispersing into meta-aramid fibrid slurry;
step 2: firstly, defibering aramid fibrid slurry by a groove type beater or a high-frequency defibering machine, and controlling the beating degree of fibrid to be 65-95 DEG SR and the specific surface area to be 60m by beating2More than g;
and step 3: then, the slurry is sieved by a centrifugal slurry sieving machine to obtain the slurry with the beating degree of 65-95 DEG SR and the specific surface area of 60m2High-pulp fibrid above/g;
and 4, step 4: mixing the high-pulp-degree precipitation fiber passing through the screen pulp and the aramid chopped fiber according to a ratio, and fully dispersing and stirring to obtain mixed pulp;
and 5: and (3) directly adopting a long-wire forming process of high-speed pulp flow to carry out net-surfing papermaking, squeezing, dewatering and drying on the mixed slurry to obtain the meta-aramid raw paper. The dewatering zone of the fourdrinier wire forming process was 18 metres to ensure dewatering of the high-pulp fibrids.
Example two
The principle of the second embodiment is the same as that of the first embodiment, except that the formulation and process conditions are different from those of the first embodiment, wherein:
the length of the meta-aramid chopped fiber is 4-6mm, and the fineness is 1-2D: the weight component is 20-30% of the absolute dry weight of the slurry;
the meta-aramid fibrid is SR with a beating degree of 65-95 DEG and a specific surface area of 60m2High-pulp fibrid above/g; the weight component is 70-80% of the absolute dry weight of the slurry;
the high-pulp-degree fibrid is formed by pulping meta-aramid fibrid; sinking the meta-aramid fiberAdding meta-aramid fibrid into a hydraulic pulper to disperse the meta-aramid fibrid into meta-aramid fibrid slurry through pulping treatment, then defibering the aramid fibrid slurry through a high-frequency defibering machine, pulping through a groove type pulping machine, and controlling the pulping degree of the fibrid to be 65-95 DEG SR and the specific surface area to be 60m2And (2) screening the pulp by a centrifugal pulp screening machine to obtain the high-pulp-degree fibrid.
The pulp screening through a centrifugal pulp screening machine is to screen the aramid pulp obtained after beating and defibering the fibrids to obtain pulp passing through a screen and fibrids not passing through the screen; the slurry passing through the screen mesh has a beating degree of 65-95 DEG SR and a specific surface area of 60m2High-pulp fibrid with a specific weight/g or more.
The meta-aramid chopped fibers and the meta-aramid fibrids are fluffed and mixed according to the proportion, and then are molded by netting to prepare the meta-aramid base paper; the upper wire forming is formed by adopting a long wire forming process of high-speed pulp flow.
The forming process of the fourdrinier wire by adopting high-speed pulp flow is characterized in that meta-aramid chopped fibers and meta-aramid fibrids are subjected to defibering and mixing according to a ratio to obtain aramid fiber mixed slurry; and directly feeding the mixed slurry into long-net papermaking equipment, and performing net-surfing papermaking, squeezing dehydration and drying by adopting a high-speed pulp flowing process to obtain the aramid raw paper.
The high-speed pulp flow is characterized in that aramid fiber mixed pulp is pumped into a flow paddle box in fourdrinier papermaking equipment, and the flow paddle amount of the flow paddle box is controlled at 8000L/min.
The dewatering area of the fourdrinier wire forming process of the high-speed pulp flow is 20 meters, so that the dewatering of the high-pulp fibrids is ensured.
The manufacturing process of the meta-aramid raw paper comprises the following specific steps:
step 1: adding meta-aramid fibrid into a hydraulic pulper and dispersing into meta-aramid fibrid slurry;
step 2: firstly, defibering aramid fibrid slurry by a groove type beater or a high-frequency defibering machine, and controlling the beating degree of fibrid to be 65-95 DEG SR and the specific surface area to be 60m by beating2More than g;
and step 3: then, the slurry is sieved by a centrifugal slurry sieving machine to obtain the slurry with the beating degree of 65-95 DEG SR and the specific surface area of 60m2High-pulp fibrid above/g;
and 4, step 4: mixing the high-pulp-degree precipitation fiber passing through the screen pulp and the aramid chopped fiber according to a ratio, and fully dispersing and stirring to obtain mixed pulp;
and 5: and (3) directly adopting a long-wire forming process of high-speed pulp flow to carry out net-surfing papermaking, squeezing, dewatering and drying on the mixed slurry to obtain the meta-aramid raw paper. The dewatering zone of the fourdrinier wire forming process is 20 meters to ensure dewatering of the high-pulp fibrids.
EXAMPLE III
The principle of the third embodiment is the same as that of the first embodiment, except that the formulation and process conditions are different from those of the first embodiment, wherein:
the length of the meta-aramid chopped fiber is 6-8mm, and the fineness is 2-3D: the weight component is 40-52% of the absolute dry weight of the slurry;
the meta-aramid fibrid has a beating degree of 65-95 DEG SR and a specific surface area of 60m2High-pulp fibrid above/g; the weight component is 48-60% of the absolute dry weight of the slurry;
the high-pulp-degree fibrid is formed by pulping meta-aramid fibrid; the meta-aramid fibrid is subjected to pulping treatment, namely, the meta-aramid fibrid is added into a hydraulic pulper to be dispersed into meta-aramid fibrid slurry, the meta-aramid fibrid slurry is defibered by a high-frequency defibrator, the beating degree of the fibrid is controlled to be 65-95 DEG SR, and the specific surface area is controlled to be 60m2And (2) screening the pulp by a centrifugal pulp screening machine to obtain the high-pulp-degree fibrid.
The pulp screening through a centrifugal pulp screening machine is to screen the aramid pulp obtained after beating and defibering the fibrids to obtain pulp passing through a screen and fibrids not passing through the screen; the slurry passing through the screen mesh has a beating degree of 65-95 DEG SR and a specific surface area of 60m2High-pulp fibrid with a specific weight/g or more.
The meta-aramid chopped fibers and the meta-aramid fibrids are fluffed and mixed according to the proportion, and then are molded by netting to prepare the meta-aramid base paper; the upper wire forming is formed by adopting a long wire forming process of high-speed pulp flow.
The forming process of the fourdrinier wire by adopting high-speed pulp flow is characterized in that meta-aramid chopped fibers and meta-aramid fibrids are subjected to defibering and mixing according to a ratio to obtain aramid fiber mixed slurry; and directly feeding the mixed slurry into long-net papermaking equipment, and performing net-surfing papermaking, squeezing dehydration and drying by adopting a high-speed pulp flowing process to obtain the aramid raw paper.
The high-speed pulp flow is characterized in that aramid fiber mixed pulp is pumped into a flow paddle box in fourdrinier papermaking equipment, and the flow paddle amount of the flow paddle box is controlled at 15000L/min.
The dewatering zone of the fourdrinier wire forming process of the high-speed pulp flow is 25 meters, so that the dewatering of the high-pulp fibrids is ensured.
The manufacturing process of the meta-aramid raw paper comprises the following specific steps:
step 1: adding meta-aramid fibrid into a hydraulic pulper and dispersing into meta-aramid fibrid slurry;
step 2: firstly, defibering aramid fibrid slurry by a groove type beater or a high-frequency defibering machine, and controlling the beating degree of fibrid to be 65-95 DEG SR and the specific surface area to be 60m by beating2More than g;
and step 3: then, the slurry is sieved by a centrifugal slurry sieving machine to obtain the slurry with the beating degree of 65-95 DEG SR and the specific surface area of 60m2High-pulp fibrid above/g;
and 4, step 4: mixing the high-pulp-degree precipitation fiber passing through the screen pulp and the aramid chopped fiber according to a ratio, and fully dispersing and stirring to obtain mixed pulp;
and 5: and (3) directly adopting a long-wire forming process of high-speed pulp flow to carry out net-surfing papermaking, squeezing, dewatering and drying on the mixed slurry to obtain the meta-aramid raw paper. The dewatering zone of the fourdrinier wire forming process was 25 metres to ensure dewatering of the high-pulp fibrids.
The above listed embodiments are only for clear and complete description of the technical solution of the present invention; it is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to the description of the embodiment, the meta-aramid chopped fiber and the meta-aramid fibrid are used as raw materials, the meta-aramid chopped fiber and the meta-aramid fibrid are fluffed and mixed according to a ratio, then the meta-aramid chopped fiber and the meta-aramid fibrid are subjected to net surfing forming to prepare the meta-aramid base paper, the meta-aramid fibrid is high-pulp-degree fibrid, and the meta-aramid fibrid is subjected to beating treatment to form a SR with a beating degree of 65-95 degrees and a specific surface area of 60m2High-pulp fibrid above/g; the upper wire forming is formed by adopting a long wire forming process of high-speed pulp flow.
Further, the pulping treatment of the meta-aramid fibrid comprises the steps of adding the meta-aramid fibrid into a hydraulic pulper to disperse the meta-aramid fibrid into meta-aramid fibrid pulp, then carrying out defibering on the meta-aramid fibrid pulp by a groove type beater or a high-frequency defibering machine, and controlling the beating degree of the fibrid to be 65-95 DEG SR and the specific surface area to be 60m by beating2And (2) screening the pulp by a centrifugal pulp screening machine to obtain the high-pulp-degree fibrid.
Further, the pulp screening by a centrifugal pulp screening machine is to screen the aramid pulp obtained after beating and defibering the fibrids to obtain pulp passing through a screen and fibrids not passing through the screen; the slurry passing through the screen mesh has a beating degree of 65-95 DEG SR and a specific surface area of 60m2High-pulp fibrid with a specific weight/g or more.
Furthermore, the forming process of the fourdrinier wire by adopting high-speed pulp flow is to defiber and mix the meta-aramid chopped fiber and the meta-aramid fibrid according to the proportion to obtain aramid mixed slurry; and directly feeding the mixed slurry into long-net papermaking equipment, and performing net-surfing papermaking, squeezing dehydration and drying by adopting a high-speed pulp flowing process to obtain the aramid raw paper.
Further, the high-speed pulp flow is formed by pumping aramid fiber mixed pulp into a flow paddle box in fourdrinier papermaking equipment, and the flow paddle amount of the flow paddle box is controlled to 3000-20000L/min.
Furthermore, the dewatering area of the fourdrinier wire forming process of the high-speed pulp flow is more than 15 meters so as to ensure the dewatering of the high-pulp fibrids.
Further, the manufacturing process of the meta-aramid base paper comprises the following specific steps:
step 1: adding meta-aramid fibrid into a hydraulic pulper and dispersing into meta-aramid fibrid slurry;
step 2: firstly, defibering aramid fibrid slurry by a groove type beater or a high-frequency defibering machine, and controlling the beating degree of fibrid to be 65-95 DEG SR and the specific surface area to be 60m by beating2More than g;
and step 3: then, the slurry is sieved by a centrifugal slurry sieving machine to obtain the slurry with the beating degree of 65-95 DEG SR and the specific surface area of 60m2High-pulp fibrid above/g;
and 4, step 4: mixing the high-pulp-degree precipitation fiber passing through the screen pulp and the aramid chopped fiber according to a ratio, and fully dispersing and stirring to obtain mixed pulp;
and 5: and (3) directly adopting a long-wire forming process of high-speed pulp flow to carry out net-surfing papermaking, squeezing, dewatering and drying on the mixed slurry to obtain the meta-aramid raw paper.
The invention has the advantages that:
through analytical research, the electrical insulation performance of the aramid paper is mainly provided by fibrids which are in a fine film-shaped structure, and the tightness degree of the bonding of the fibrids and the chopped fibers directly determines the magnitude of the insulation performance. The general manufacturers are limited by the production process of inclined wire or circular wire, the dehydration area is less than 5 m, the dehydration is difficult, the high-pulp fibrid can not be adopted, the general beating degree is 30-60 DEG SR, the specific surface area is 30m2The ratio of the total carbon content to the total carbon content is below g; the invention adopts the long net forming process of high-speed pulp flow, and extends the dewatering area to more than 15 meters, thus satisfactorily solving the problem of low dewatering efficiencyThe problem of difficult dehydration of high-pulp fibrids is solved, so that SR with the beating degree of 65-95 ℃ and the specific surface area of 60m is adopted2High-pulp fibrid above/g; because the high-pulp precipitation fiber has large specific surface area and strong adsorption force and is combined with the chopped fiber more tightly, the prepared aramid fiber paper has compact integral structure, no obvious pores, difficult invasion of moisture, high electrical strength of the finished paper and difficult moisture regain.
According to the invention, the beating degree and the specific surface area of the meta-aramid fibrid are improved, and the long-net forming process of high-speed pulp flow is adopted for forming, so that the high insulation performance of the manufactured aramid base paper is effectively improved, the electrical strength of the base paper is more than 12kV/mm, the electrical strength of the base paper after hot pressing can reach more than 30kV/mm, and the meta-aramid fibrid fully has the capability of long-term safe and stable operation in the electric field environment of a high-voltage motor or a transformer.
Claims (7)
1. A method for manufacturing meta-aramid base paper with high insulation performance adopts meta-aramid chopped fibers and meta-aramid fibrids as raw materials, and prepares the meta-aramid base paper by defibering and mixing the meta-aramid chopped fibers and the meta-aramid fibrids according to a ratio and net surfing and forming, and is characterized in that: the meta-aramid fibrid is high-pulp fibrid, and the meta-aramid fibrid is subjected to beating treatment to form SR with the beating degree of 65-95 degrees and the specific surface area of 60m2High-pulp fibrid above/g; the upper wire forming is formed by adopting a long wire forming process of high-speed pulp flow.
2. The method for manufacturing the meta-aramid base paper with high insulation performance as claimed in claim 1, wherein the method comprises the following steps: the meta-aramid fibrid is subjected to beating treatment, namely, the meta-aramid fibrid is added into a hydraulic pulper to be dispersed into meta-aramid fibrid pulp, the meta-aramid fibrid pulp is defibered by a groove type beater or a high-frequency defibrator, and the beating degree of the fibrid is controlled to be 65-95 DEG SR by beating, and the specific surface area is 60m2And (2) screening the pulp by a centrifugal pulp screening machine to obtain the high-pulp-degree fibrid.
3. The method for manufacturing the meta-aramid base paper with high insulation performance as claimed in claim 2, characterized in that: the pulp screening through a centrifugal pulp screening machine is to screen the aramid pulp obtained after beating and defibering the fibrids to obtain pulp passing through a screen and fibrids not passing through the screen; the slurry passing through the screen mesh has a beating degree of 65-95 DEG SR and a specific surface area of 60m2High-pulp fibrid with a specific weight/g or more.
4. The method for manufacturing the meta-aramid base paper with high insulation performance as claimed in claim 1, wherein the method comprises the following steps: the forming process of the fourdrinier wire by adopting high-speed pulp flow is characterized in that meta-aramid chopped fibers and meta-aramid fibrids are subjected to defibering and mixing according to a ratio to obtain aramid fiber mixed slurry; and directly feeding the mixed slurry into long-net papermaking equipment, and performing net-surfing papermaking, squeezing dehydration and drying by adopting a high-speed pulp flowing process to obtain the aramid raw paper.
5. The method for manufacturing the meta-aramid base paper with high insulation performance as claimed in claim 4, wherein the method comprises the following steps: the high-speed pulp flow is to pump aramid fiber mixed pulp into a flow paddle box in fourdrinier papermaking equipment, and the flow paddle amount of the flow paddle box is controlled to 3000-20000L/min.
6. The method for manufacturing the meta-aramid base paper with high insulation performance as claimed in claim 5, wherein the method comprises the following steps: the dewatering area of the long-net forming process of the high-speed pulp flow is more than 15 meters so as to ensure the dewatering of the high-pulp fibrids.
7. The method for manufacturing the meta-aramid base paper with high insulation performance as claimed in claim 4, wherein the method comprises the following steps: the manufacturing process of the meta-aramid base paper comprises the following specific steps:
step 1: adding meta-aramid fibrid into a hydraulic pulper and dispersing into meta-aramid fibrid slurry;
step 2: firstly, aramid fibrid slurry is defibered by a groove type beater or a high-frequency defibering machine, and the settlement is controlled by beatingThe beating degree of the fibrid is 65-95 DEG SR, and the specific surface area is 60m2More than g;
and step 3: then, the slurry is sieved by a centrifugal slurry sieving machine to obtain the slurry with the beating degree of 65-95 DEG SR and the specific surface area of 60m2High-pulp fibrid above/g;
and 4, step 4: mixing the high-pulp-degree precipitation fiber passing through the screen pulp and the aramid chopped fiber according to a ratio, and fully dispersing and stirring to obtain mixed pulp;
and 5: and (3) directly adopting a long-wire forming process of high-speed pulp flow to carry out net-surfing papermaking, squeezing, dewatering and drying on the mixed slurry to obtain the meta-aramid raw paper.
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