CN110965394B - Aramid fiber and wood pulp composite paper and preparation method thereof - Google Patents
Aramid fiber and wood pulp composite paper and preparation method thereof Download PDFInfo
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- CN110965394B CN110965394B CN201911364086.5A CN201911364086A CN110965394B CN 110965394 B CN110965394 B CN 110965394B CN 201911364086 A CN201911364086 A CN 201911364086A CN 110965394 B CN110965394 B CN 110965394B
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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
- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- 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
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/24—Structural elements or technologies for improving thermal insulation
- Y02A30/244—Structural elements or technologies for improving thermal insulation using natural or recycled building materials, e.g. straw, wool, clay or used tires
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention provides aramid fiber and wood pulp composite paper, and belongs to the technical field of production and preparation of aramid fiber paper. The composite paper is of a three-layer structure, the aramid fiber material layers are arranged on two sides of the composite paper, and the wood pulp material layer is arranged in the middle layer of the composite paper. The invention is prepared by respectively delivering aramid fiber pulp, wood pulp and aramid fiber pulp to the net part to form wet paper, then compounding the wet paper on the net part in a certain sequence, squeezing, drying and coiling, and hot pressing the product according to application requirements to meet corresponding application requirements. The prepared product meets the corresponding technical requirements, has the cost far lower than aramid base paper or aramid paper, has the heat resistance better than wood pulp paper, can bear overload in a short time, and protects the use of a motor or a transformer.
Description
Technical Field
The invention belongs to the technical field of production and preparation of aramid fiber paper, and particularly relates to aramid fiber and wood pulp composite paper and a preparation method thereof.
Background
Aramid fiber paper (also called aramid fiber paper) is prepared by using aramid short fibers and aramid fibrids as paper making raw materials, papermaking and molding by a wet method, and then hot-press molding. Aramid paper is classified into meta-aramid paper and para-aramid paper according to the material.
1. Meta-aramid paper: the meta-aramid paper is a special paper made of pure meta-aramid (poly-m-phenyleneisophthalamide fiber), has high strength, low deformation, high temperature resistance, chemical corrosion resistance, flame retardance and excellent electrical insulation performance, is widely applied to the fields of national defense, aerospace, high-speed trains, electrical insulation and the like, and is a high-tech new material related to national safety.
2. Para-aramid paper: the paper is made by using para-aramid chopped fiber and para-aramid fibrid (aramid pulp) as raw materials and papermaking technology, and then hot-press forming is carried out.
The aramid paper is used as an insulating material, has excellent electrical property, mechanical property, high temperature resistance and flame retardance, and is high in price; although wood pulp paper is cheap, the high temperature resistance and the flame retardant property of the wood pulp paper are poor, and the performance of the wood pulp paper cannot be guaranteed when the wood pulp paper is applied to motors and transformers in special fields.
Patent 201611252138.6 reports a bismuth hydroxide modified aramid pulp insulation performance enhanced degradable waterproof paper, which is prepared by mixing and stirring wood pulp, aramid pulp and related additives uniformly, dehydrating and pressing the mixture through a net part of a paper machine, drying the mixture to form paper, extruding the paper under a press polish and a hot press, and finally dipping the paper in the additives. The patent mentions that the insulating property is enhanced, but the waterproof and moistureproof performance is good, the storage is easy and the insulation film is degradable, and is mainly used for daily office printing and copying.
Patent 201810913816.1 reports a micro-nano cellulose fiber/aramid fiber composite insulation paper, which is prepared by defibering and pulping aramid chopped fibers, aramid pulp and micro-nano cellulose fibers, then feeding the obtained product to a paper machine, papermaking and forming, drying and hot-pressing. The forming process comprises the steps of flowing the three sizing materials to three adjacent flow passages of a paper machine, and laminating the three sizing materials in the same region to form paper, so as to obtain wet paper.
Patent CN103510429.B reports a composite flame-retardant paper base material and a preparation method thereof, wood pulp and aramid pulp are mixed and then mixed with flame-retardant filler to prepare base paper, and then wood pulp and ammonium polyphosphate water solution are printed and coated on the surface of the base paper, so that the flame-retardant paper base material has better flame retardance.
The aramid fiber and wood pulp composite paper prepared by the patent is formed into different wet paper by separately and independently adding the pulp of the aramid fiber pulp, the wood pulp and the aramid fiber pulp, is compounded at the net part by three layers of wet paper according to corresponding sequence, is obtained by squeezing, drying and reeling, and can be hot-pressed according to application requirements to obtain the composite paper with corresponding performance. The aramid fiber paper has excellent electrical insulation performance, mechanical property, high temperature resistance and good flame retardance, has lower price compared with pure aramid fiber paper, and brings corresponding economic benefits for enterprise production. The preparation process is simple and easy to implement, and the product meets the corresponding performance requirements.
Disclosure of Invention
The invention mainly aims to prepare the aramid fiber and wood pulp composite paper which not only meets the performance requirements of the insulation industry of motors and transformers, but also has relatively low price.
The technical scheme of the invention is realized as follows:
the invention provides aramid fiber and wood pulp composite paper which is at least of a three-layer structure, wherein aramid fiber material layers are arranged on two sides of the composite paper, and a wood pulp material layer is arranged in the middle layer of the composite paper.
As a further improvement of the invention, the aramid fiber material is meta-aramid fiber or para-aramid fiber or a mixture of the meta-aramid fiber and the para-aramid fiber.
As a further improvement of the invention, the aramid material layer comprises aramid fibrids and aramid chopped fibers, and the beating degree of the slurry of the aramid fibrids is higher than 25 DEG SR.
As a further improvement of the invention, the mass content ratio of the aramid fibrid to the aramid chopped fiber in the aramid mixed slurry is (20-80%): (80-20%).
As a further improvement of the invention, the wood pulp material is softwood pulp or hardwood pulp or a mixture of the two.
As a further improvement of the invention, the pulp of the wood pulp material has a freeness above 20 ° SR.
As a further improvement of the invention, the mass content ratio of the pulp of the aramid fiber material at the first layer, the pulp of the wood pulp material at the second layer and the pulp of the aramid fiber material at the third layer is (15-40%): (70-20%): (15-40%).
The invention further protects a preparation method of the aramid fiber and wood pulp composite paper, which comprises the steps of respectively conveying the sizing agents corresponding to the three-layer structure to the net part to form wet paper, compounding the wet paper on the net part in sequence, and then squeezing, drying and reeling the wet paper to obtain the aramid fiber and wood pulp composite paper.
As a further improvement of the invention, the coiled paper pattern is hot-pressed at high temperature according to the application requirements of the product.
As a further improvement of the present invention, the hot pressing conditions are: the hot pressing temperature range is 120-400 ℃, and the linear pressure range is 50-400 kPa.
The invention has the following beneficial effects:
1. the composite paper is at least three layers of composite paper, and each layer is made of an independent aramid fiber material or a wood pulp material. The aramid fiber material layer does not contain other materials, and the combination degree, the electrical performance, the mechanical performance, the high temperature resistance and the flame retardance of the aramid fiber material layer are far higher than the performance of the aramid fiber material layer mixed with wood pulp or other materials. Meanwhile, the aramid fiber material layer is a uniform mixing layer of aramid chopped fibers and fibrids, and does not contain other materials, so that the high-temperature hot pressing of the composite paper is realized.
2. The aramid fiber pulp and the wood pulp are pulped and are respectively and independently fed to the net to form wet paper, so that the flocculation problem after the two kinds of pulp are mixed can be reduced.
3. The composite paper is formed by compounding three layers of wet paper under pressure, other substances are not introduced, and the preparation process is simple and easy to implement.
4. The aramid fiber and wood pulp composite paper disclosed by the invention has excellent electrical insulation performance, mechanical property, high temperature resistance and better flame retardance, can bear overload in a short time, protects a motor or a transformer, has a lower price compared with pure aramid fiber paper, and brings corresponding economic benefits to enterprise production.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The composite paper is of a three-layer structure, aramid material layers are arranged on two sides of the composite paper, and a wood pulp material layer is arranged in the middle of the composite paper. The aramid fiber material in the aramid fiber and wood pulp composite paper is meta-aramid fiber. The aramid fiber material layer comprises aramid fibrid and aramid chopped fiber, wherein the beating degree of the slurry of the aramid fibrid is 60-degree SR. The mass content ratio of the aramid fibrid to the aramid chopped fiber in the aramid mixed slurry is 20%: 80 percent.
The wood pulp material is softwood pulp.
The freeness of the pulp of the wood pulp material was 80 ° SR.
The mass content ratio of the pulp of the aramid fiber material of the first layer, the pulp of the wood pulp material of the second layer and the pulp of the aramid fiber material of the third layer is 30%: 40%: 30 percent.
The preparation method comprises the following steps: and respectively feeding the pulp corresponding to the three-layer structure onto a net to form wet paper, compounding the wet paper at the net part in sequence, squeezing, drying and coiling to obtain the wet paper.
Example 2
The composite paper is of a three-layer structure, wherein aramid fiber material layers are arranged on two sides of the composite paper, and a wood pulp material layer is arranged in the middle layer of the composite paper. The aramid fiber material in the aramid fiber and wood pulp composite paper is meta-aramid fiber. The aramid fiber material layer comprises aramid fibrid and aramid chopped fiber, wherein the beating degree of the slurry of the aramid fibrid is 70 degrees SR. The mass content ratio of the aramid fibrid to the aramid chopped fiber in the aramid mixed slurry is 50%: 50 percent.
The wood pulp material is softwood pulp.
The freeness of the pulp of the wood pulp material was 91 ° SR.
The mass content ratio of the pulp of the aramid fiber material of the first layer, the pulp of the wood pulp material of the second layer and the pulp of the aramid fiber material of the third layer is 30%: 40%: 30 percent.
The preparation method comprises the following steps: and respectively delivering the sizing agents corresponding to the three-layer structure to a net to form wet paper, compounding the wet paper on the net part in sequence, squeezing, drying and coiling to obtain raw paper of the composite paper, and hot-pressing the raw paper of the composite paper at the hot-pressing temperature of 300 ℃ and the linear pressure of 300 kPa.
Example 3
The composite paper is of a three-layer structure, wherein aramid fiber material layers are arranged on two sides of the composite paper, and a wood pulp material layer is arranged in the middle layer of the composite paper. The aramid fiber material in the aramid fiber and wood pulp composite paper is meta-aramid fiber. The aramid fiber material layer comprises aramid fibrid and aramid chopped fiber, wherein the beating degree of the slurry of the aramid fibrid is 70 degrees SR. The mass content ratio of the aramid fibrid to the aramid chopped fiber in the aramid mixed slurry is 40%: 60 percent.
The wood pulp material is softwood pulp.
The freeness of the pulp of the wood pulp material was 91 ° SR.
The mass content ratio of the pulp of the aramid fiber material of the first layer, the pulp of the wood pulp material of the second layer and the pulp of the aramid fiber material of the third layer is 40%: 20%: 40 percent.
The preparation method comprises the following steps: and respectively delivering the sizing agents corresponding to the three-layer structure to a net to form wet paper, compounding the wet paper on the net part in sequence, squeezing, drying and coiling to obtain raw paper of the composite paper, and then carrying out hot pressing on the raw paper of the composite paper, wherein the hot pressing temperature is 320 ℃, and the linear pressure is 300 kPa.
Comparative example 1
An aramid raw paper is prepared from aramid chopped fibers and aramid fibrids. The aramid chopped fiber and aramid fibrid material in the aramid base paper is meta-aramid. The beating degree of the slurry of the aramid fibrid is 60 degrees SR. The mass content ratio of the aramid fibrid to the aramid chopped fiber in the aramid mixed slurry is 20%: 80 percent.
The preparation method comprises the following steps: mixing the aramid chopped fiber and the aramid fibrid, then carrying out net-feeding forming, and then carrying out squeezing, drying and reeling to obtain the aramid fiber composite material.
Comparative example 2
Aramid paper is prepared from aramid chopped fibers and aramid fibrids. The aramid chopped fiber and aramid fibrid material in the aramid paper is meta-aramid. The beating degree of the slurry of the aramid fibrid is 70 DEG SR. The mass content ratio of the aramid fibrid to the aramid chopped fiber in the aramid mixed slurry is 40%: 60 percent.
The preparation method comprises the following steps: mixing the aramid chopped fibers and the aramid fibrids, then carrying out net-feeding forming, carrying out squeezing, drying and reeling to obtain aramid base paper, and carrying out hot pressing on the aramid base paper, wherein the hot pressing temperature is 300 ℃, and the linear pressure is 300 kPa.
Comparative example 3
A composite paper is prepared from aramid chopped fiber, aramid fibrid and wood pulp fiber. The aramid chopped fiber and aramid fibrid material in the composite paper is meta-aramid, and the wood pulp fiber is softwood pulp. The beating degree of the slurry of the aramid fibrid is 70 degrees SR, and the beating degree of the wood pulp fiber is 91 degrees SR. The mass content ratio of the aramid fibrid, the aramid chopped fiber and the wood pulp fiber in the mixed slurry is 32%: 48%: 20 percent.
The preparation method comprises the following steps: mixing the aramid chopped fiber, the aramid fibrid and the wood pulp fiber, then carrying out net-feeding forming, and then carrying out squeezing, drying and reeling to obtain the composite paper.
Test example 1
For the above examples 1-3 and comparative examples 1-3, the same specification paper pattern was selected for test comparison, and the results are shown in table 1:
TABLE 1
As can be seen from the above table, the tensile strength and the elongation of the aramid and wood pulp composite paper prepared in example 1 of the present invention are higher than those of comparative example 1, and the electrical properties are close; the mechanical properties and the electrical properties of the aramid fiber and wood pulp composite paper prepared in the embodiment 2 and the embodiment 3 are equivalent to those of the comparative embodiment 2, and the aramid fiber and wood pulp composite paper can be used in corresponding fields; comparative example 3 is a paper sample prepared by mixing an aramid material and a wood pulp material, but it has a problem of not being hot-pressed, and mechanical properties, electrical properties, high temperature resistance and flame retardancy are inferior to those of examples 2 and 3, compared to examples 2 and 3. The product prepared by the invention meets the corresponding technical requirements, has the cost far lower than aramid base paper or aramid paper, has the heat resistance better than wood pulp paper, can bear overload in a short time, and protects the use of a motor or a transformer.
Compared with the prior art, the composite paper provided by the invention is three layers of composite paper, and each layer is made of an independent aramid fiber material or a wood pulp material. The aramid fiber material layer does not contain other materials, and the combination degree, the electrical performance, the mechanical performance, the high temperature resistance and the flame retardance of the aramid fiber material layer are far higher than the performance of the aramid fiber material layer mixed with wood pulp or other materials. Meanwhile, the aramid fiber material layer is a uniform mixing layer of aramid chopped fibers and fibrids, and does not contain other materials, so that the high-temperature hot pressing of the composite paper is realized.
The aramid fiber pulp and the wood pulp are pulped and are respectively and independently fed to the net to form wet paper, so that the flocculation problem after the two kinds of pulp are mixed can be reduced.
The composite paper is compounded by three layers of wet paper under pressure, other substances are not introduced, and the preparation process is simple and easy to implement.
The aramid fiber and wood pulp composite paper disclosed by the invention has excellent electrical insulation performance, mechanical property, high temperature resistance and better flame retardance, can bear overload in a short time, protects a motor or a transformer, has a lower price compared with pure aramid fiber paper, and brings corresponding economic benefits to enterprise production.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (1)
1. The aramid fiber and wood pulp composite paper is characterized in that the composite paper is of a three-layer structure, aramid fiber material layers are arranged on two sides of the composite paper, and a wood pulp material layer is arranged in the middle of the composite paper; the aramid fiber material is meta-aramid fiber or para-aramid fiber or a mixture of the meta-aramid fiber and the para-aramid fiber; the aramid fiber material layer comprises aramid fiber fibrids and aramid chopped fibers, and the beating degree of slurry of the aramid fiber fibrids is 60-91 DEG SR; the mass content ratio of the aramid fibrid to the aramid chopped fiber in the aramid mixed slurry is (20-80%): (80-20%); the wood pulp material is softwood pulp or a mixture of softwood pulp and hardwood pulp; the mass content ratio of the pulp of the aramid fiber material at the first layer, the pulp of the wood pulp material at the second layer and the pulp of the aramid fiber material at the third layer is (15-40%): (70-20%): (15-40%);
the preparation method of the aramid fiber and wood pulp composite paper comprises the following steps: respectively delivering the sizing agents corresponding to the three-layer structure to an upper wire to form wet paper, compounding the wet paper at a wire part in sequence, squeezing, drying and coiling the wet paper to obtain the paper sample, and performing high-temperature hot pressing on the coiled paper sample according to the application requirement of the product;
the hot pressing conditions are as follows: the hot pressing temperature range is 120-400 ℃, and the linear pressure range is 50-400 kPa.
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| CN103137931A (en) * | 2013-01-23 | 2013-06-05 | 广州华创化工材料科技开发有限公司 | Diaphragm paper and preparation method and application thereof |
| CN103284647A (en) * | 2012-02-22 | 2013-09-11 | 金红叶纸业集团有限公司 | Household paper |
| CN103952947A (en) * | 2014-04-23 | 2014-07-30 | 华南理工大学 | Aramid fiber paper and preparation method thereof |
| CN104594106A (en) * | 2014-12-25 | 2015-05-06 | 深圳昊天龙邦复合材料有限公司 | Layered composite aramid fiber paper and preparation method thereof |
| CN106283836A (en) * | 2016-08-30 | 2017-01-04 | 烟台民士达特种纸业股份有限公司 | A kind of preparation method of high density aramid fiber insulation hardboard |
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- 2019-12-26 CN CN201911364086.5A patent/CN110965394B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103284647A (en) * | 2012-02-22 | 2013-09-11 | 金红叶纸业集团有限公司 | Household paper |
| CN103137931A (en) * | 2013-01-23 | 2013-06-05 | 广州华创化工材料科技开发有限公司 | Diaphragm paper and preparation method and application thereof |
| CN103952947A (en) * | 2014-04-23 | 2014-07-30 | 华南理工大学 | Aramid fiber paper and preparation method thereof |
| CN104594106A (en) * | 2014-12-25 | 2015-05-06 | 深圳昊天龙邦复合材料有限公司 | Layered composite aramid fiber paper and preparation method thereof |
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