CN110656529B - Fine fiber, preparation method and application thereof, and preparation method of diaphragm for electrical equipment - Google Patents

Fine fiber, preparation method and application thereof, and preparation method of diaphragm for electrical equipment Download PDF

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Publication number
CN110656529B
CN110656529B CN201910863741.5A CN201910863741A CN110656529B CN 110656529 B CN110656529 B CN 110656529B CN 201910863741 A CN201910863741 A CN 201910863741A CN 110656529 B CN110656529 B CN 110656529B
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fiber
fibers
pulping
micro
diaphragm
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CN110656529A (en
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陈雪峰
刘�文
毛宗久
江骁雅
朝鲁门
王萌
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China National Pulp and Paper Research Institute
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China National Pulp and Paper Research Institute
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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
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • 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
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • 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
    • D21H13/02—Synthetic cellulose fibres
    • 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
    • D21H13/02—Synthetic cellulose fibres
    • D21H13/08—Synthetic cellulose fibres from regenerated cellulose
    • 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
    • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/16—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/52—Separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/403—Manufacturing processes of separators, membranes or diaphragms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/411—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/44—Fibrous material
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Power Engineering (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Paper (AREA)

Abstract

The invention relates to the field of micro-fibers, in particular to a micro-fiber, a preparation method and application thereof, and a preparation method of a diaphragm for electrical equipment. The invention provides a microfiber, which is obtained by mechanically treating hemp pulp fiber, poly-p-phenylene terephthalamide fiber or regenerated cellulose fiber; the diameter of the fine fiber is 0.1 to 0.5 μm. The invention also provides a preparation method of the diaphragm for the electrical equipment, which comprises the following steps: mixing the micro-fine fibers, the papermaking fibers and water to obtain mixed slurry; and carrying out paper machine manufacturing treatment on the mixed slurry to obtain the diaphragm for the electrical equipment. The diameter of the micro-fiber provided by the invention is small, the micro-fiber can be used for preparing a diaphragm for electrical equipment, and the prepared diaphragm for the electrical equipment has the characteristics of small aperture and high porosity.

Description

Fine fiber, preparation method and application thereof, and preparation method of diaphragm for electrical equipment
Technical Field
The invention relates to the field of micro-fibers, in particular to a micro-fiber, a preparation method and application thereof, and a preparation method of a diaphragm for electrical equipment.
Background
The diaphragm used by the electrical equipment, such as a super capacitor diaphragm, a battery diaphragm, high-efficiency filter paper and the like, needs the diaphragm to have structural properties of high porosity, small pore diameter, uniform pore diameter distribution and the like, and has higher requirements on the diaphragm material. The diaphragm used by the electrical equipment is formed by matching and manufacturing long fibers and highly-fibrillated fibers, the higher the highly-fibrillated fiber degree is, the richer the surface structure is, the better the grabbing force is, the higher the prepared diaphragm strength is, and meanwhile, the special pore structure of the diaphragm is favorably formed.
The method for preparing the highly-fine chemical fiber in the prior art generally comprises a chemical spinning method and a mechanical stripping method, wherein some chemical fibers, such as polyester fibers, can obtain superfine fibers through the chemical spinning method, but the fibers have no bonding force and poor strength, and a diaphragm with a special pore structure cannot be obtained through paper making; the diameter of the fiber obtained by a mechanical stripping method of the common plant fiber is about 10 microns, so that the diameter of the fiber cannot be further reduced, and the special pore structure requirement of the diaphragm cannot be met.
Disclosure of Invention
The invention provides a micro fiber, and the diameter of the micro fiber provided by the invention can reach 0.1-0.5 μm.
The invention provides a microfiber, which is obtained by mechanically treating hemp pulp fiber, poly-p-phenylene terephthalamide fiber or regenerated cellulose fiber; the diameter of the fine fiber is 0.1 to 0.5 μm.
The method provides the preparation method of the micro-fiber in the technical scheme, which comprises the following steps:
(1) mixing a fiber raw material with water to form a fiber slurry;
(2) mechanically treating the fiber slurry to obtain micro fibers; the mechanical treatment comprises disc grinding pulping and/or stone knife pulping.
Preferably, the disc mill pulping power in the step (2) is 49-55 kW, and the disc mill pulping time is 30 min-7 h.
Preferably, the current for pulping by the stone knife in the step (2) is 55-65A, and the pulping time of the stone knife is 15-25 h.
Preferably, the fiber raw material is a hemp pulp fiber, a poly-p-phenylene terephthamide fiber or a regenerated cellulose fiber, the diameter of the fiber raw material is 2-38 mm, and the fineness of the fiber raw material is 1.4-2.0 Dtex.
The invention also provides application of the micro-fiber in the technical scheme or the micro-fiber prepared by the method in the technical scheme in a diaphragm used for electrical equipment.
The invention provides a preparation method of a diaphragm for electrical equipment, which comprises the following steps:
(a) mixing the micro-fine fibers, the papermaking fibers and water to obtain mixed slurry; the microfine fiber is the microfine fiber of the technical scheme or the microfine fiber prepared by the method of the technical scheme;
(b) and carrying out paper machine manufacturing treatment on the mixed slurry to obtain the diaphragm for the electrical equipment.
Preferably, the paper making fiber in the step (a) comprises one or more of hemp pulp fiber, Chinese alpine rush fiber, hydrated cellulose fiber and vinylon fiber.
Preferably, the mass ratio of the fine fibers to the fibers blended in the step (a) is 85-90: 10-15.
Preferably, the total mass concentration of the fibers in the mixed slurry in the step (a) is 0.5-1.5%.
The invention provides a microfiber, which is obtained by mechanically treating hemp pulp fiber, poly-p-phenylene terephthalamide fiber or regenerated cellulose fiber; the diameter of the fine fiber is 0.1 to 0.5 μm. The diameter of the micro-fiber provided by the invention is smaller, the micro-fiber can meet the requirements of a diaphragm used by electrical equipment, the micro-fiber can be used for preparing the diaphragm used by the electrical equipment, and the prepared diaphragm has the characteristics of small aperture and high porosity.
The invention also provides a preparation method of the diaphragm for the electrical equipment, which comprises the following steps: mixing the micro-fine fibers, the papermaking fibers and water to obtain mixed slurry; the microfine fiber is the microfine fiber of the technical scheme or the microfine fiber prepared by the method of the technical scheme; and carrying out paper machine manufacturing treatment on the mixed slurry to obtain the diaphragm for the electrical equipment. The diaphragm prepared by the method has the characteristics of small aperture and high porosity. As shown in the embodiment of the invention, the thickness of the super capacitor diaphragm provided by the invention is 30-40 μm, the porosity is 61.5-69%, and the average pore diameter is 0.826-0.834 μm; the thickness of the battery separator was 0.122mm, the porosity was 51.1%, and the average pore diameter was 28.9. mu.m.
Drawings
FIG. 1 is a microscopic view of a lyocell-fine-fiber-containing slurry obtained in example 1 of the present invention;
FIG. 2 is a microscopic view of a lyocell-fine-fiber-containing slurry obtained in example 3 of the present invention.
Detailed Description
The invention provides a microfiber, which is obtained by mechanically treating hemp pulp fiber, poly-p-phenylene terephthalamide fiber or regenerated cellulose fiber; the diameter of the fine fiber is 0.1 to 0.5 μm.
In the present invention, the regenerated cellulose fibers preferably include lyocell fibers.
The invention also provides a preparation method of the micro-fiber in the technical scheme, which comprises the following steps:
(1) mixing a fiber raw material with water to form a fiber slurry;
(2) mechanically treating the fiber slurry to obtain micro fibers; the mechanical treatment comprises disc grinding pulping and/or stone knife pulping.
The present invention mixes a fiber feedstock with water to form a fiber slurry. In the present invention, the fiber raw material preferably includes hemp pulp fiber, poly (p-phenylene terephthalamide) fiber, or regenerated cellulose fiber, which preferably includes lyocell fiber; the fineness of the fiber raw material is preferably 1.4-2.0 Dtex, more preferably 1.5-1.9 Dtex, and more preferably 1.6-1.8 Dtex; the length of the fiber raw material is preferably 2-38 mm, more preferably 5-35 mm, and even more preferably 10-30 mm. In the present invention, when the length of the fiber raw material is not less than 38mm, the fiber raw material is preferably cut by a high-consistency disc mill and then subjected to subsequent mechanical treatment. In the present invention, the fiber and length of the fiber material are preferably controlled within the above-mentioned ranges, which is advantageous for producing a fine fiber having a small diameter.
In the invention, when the subsequent mechanical treatment is disc mill pulping, the pulping concentration of the fiber pulp is preferably 1.8-3.0%, more preferably 2.0-2.8%, and even more preferably 2.4-2.6%; when the subsequent mechanical treatment is stone knife pulping, the pulping concentration of the fiber pulp is preferably 4.8-6.0%. According to the invention, the beating concentration of the fiber pulp is preferably controlled within the range, so that the preparation of the fine fiber with smaller diameter is facilitated.
After the fiber slurry is obtained, the fiber slurry is mechanically processed to obtain the micro-fibers.
In the present invention, the mechanical treatment comprises disc mill beating and/or stone knife beating. In the invention, the disc mill beating is preferably carried out in a disc mill beater, the disc mill beating power is preferably 49-55 kW, and the disc mill beating time is preferably 30 min-7 h. In the invention, the stone knife beating is preferably carried out in a stone knife beating machine, the current for the stone knife beating is preferably 55-65A, and the time for the stone knife beating is preferably 15-25 h.
In the invention, when the fiber raw material is the jute pulp fiber, the beating degree of the jute pulp fiber slurry is preferably 45-85 DEG SR, and the wet weight of the jute pulp fiber is preferably 2.0-6.0 g; when the fiber raw material is preferably poly-p-phenylene terephthalamide fiber or regenerated cellulose fiber, the beating degree of the poly-p-phenylene terephthalamide fiber pulp or the regenerated cellulose fiber pulp is preferably 75-95 DEG SR independently, and the wet weight is preferably 1.5-5.0 g independently.
The present invention can obtain a fiber slurry containing microfine fibers by the above mechanical treatment. In the present invention, the fiber slurry containing the fine fibers can be used as it is as a raw material for producing a separator for an electrical device, and there is no need to dry the fiber slurry containing the fine fibers.
The method takes the hemp pulp fiber, the poly-p-phenylene terephthamide fiber or the regenerated cellulose fiber as raw materials, and combines the control of the parameters of subsequent mechanical treatment conditions based on the structural characteristics of the fiber raw materials, so that the method can prepare the micro fiber with the diameter of 0.1-0.5 mu m.
The invention also provides application of the microfiber in a diaphragm used for electrical equipment. In the present invention, the separator material of the electrical device preferably includes the microfine fiber of the present invention.
The invention also provides a preparation method of the diaphragm for the electrical equipment, which comprises the following steps:
(a) mixing the micro-fine fibers, the papermaking fibers and water to obtain mixed slurry; the microfine fiber is the microfine fiber of the technical scheme;
(b) and carrying out paper machine manufacturing treatment on the mixed slurry to obtain the diaphragm for the electrical equipment.
In the present invention, the separator for electrical equipment preferably includes a supercapacitor separator, a battery separator. The invention mixes the micro-fiber, the paper making fiber and water to obtain the mixed slurry. In the present invention, the fine fibers are the fine fibers described in the above technical means.
In the invention, the mass ratio of the fine fibers to the paper making fibers is preferably 85-90: 10-15; the total mass concentration of the fibers in the mixed slurry is preferably 0.5 to 1.5%, more preferably 0.8 to 1.3%, and even more preferably 1.0%.
According to the invention, the prepared fiber and water are preferably mixed and then subjected to pulping treatment to obtain the prepared fiber slurry. In the invention, the beating mode preferably comprises disc mill beating or stone knife beating. In the present invention, the companion fiber preferably includes one or more of hemp pulp fiber, devil's rush fiber, hydrated cellulose fiber, and vinylon fiber. In the invention, when the preferable pulping mode is disc grinding pulping, the preferable pulping power of the disc grinding is 49-55 kW, and the preferable pulping time of the disc grinding is 30 min-20 h; when the preferred beating mode is the stone knife beating, the preferred electric current of stone knife beating is 50 ~ 55A, the preferred time of stone knife beating is 15 ~ 25 h.
In the invention, the beating degree of the blended fiber pulp is preferably 35-50 DEG SR, and the wet weight of the blended fiber is preferably 4.5-5.0 g.
After the paper making fiber slurry is obtained, the paper making fiber slurry is mixed with the micro fibers to obtain mixed slurry. The present invention does not require special mixing means, as will be appreciated by those skilled in the art.
After the mixed slurry is obtained, the mixed slurry is subjected to paper machine papermaking treatment. The present invention is not particularly limited to the specific embodiment of the paper machine making process, and may be carried out in a paper machine making manner known to those skilled in the art. In a particular embodiment of the invention, the paper machine making is preferably cylinder machine making or fourdrinier machine making.
After the paper machine is used for manufacturing, the diaphragm is preferably obtained by sequentially carrying out pressing, drying and calendaring. The present invention does not require special embodiments of the pressing, drying and calendering process, in a manner well known to those skilled in the art.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
Example 1
Mixing raw material Lyocell (Lyocell) fiber and water to form fiber slurry; wherein the length of the lyocell fiber is 5mm, and the pulping concentration of the fiber pulp is 5.5%;
treating the fiber pulp by using a stone beater to obtain pulp containing lyocell micro-fibers; wherein the current of the beater is 55A, and the beating time is 22.5 h; the prepared lyocell fiber slurry had a freeness of 81.5 ° SR and a wet weight of 3.04 g.
The diameter of the lyocell microfiber prepared is 0.1 to 0.5 μm. As shown in fig. 1, it is understood from fig. 1 that the optical micrograph of the lyocell microfine fibers obtained in example 1 shows lyocell main fibers as thick lines and lyocell microfine fibers as thin lines in fig. 1. The length of the scale in the upper left corner of FIG. 1 is 0.2mm, and the ". times.10" in parentheses indicates the objective lens magnification.
Example 2
Mixing raw material hemp pulp fibers with water to form fiber pulp; wherein the length of the hemp pulp fiber is 3.42mm, and the beating concentration of the fiber pulp is 3.0 percent;
treating the fiber pulp by a disc mill beater to obtain pulp containing bast fiber micro-fibers; wherein the power of the pulping machine is 50kW, and the pulping time is 1 h; the prepared jute pulp fiber slurry had a pulping degree of 50 ° SR and a wet weight of 4.5 g. The diameters of the hemp pulp micro-fibers prepared in the embodiment 3 are 0.1 to 0.5 μm.
Example 3
Taking the lyocell fiber with the length of 38mm as a raw material, and mixing the lyocell fiber with water to form fiber slurry; the pulping concentration of the fiber pulp is 2.0 percent;
cutting the fiber pulp by using a high-concentration disc mill, and then processing the fiber pulp by using a disc mill beater to obtain pulp containing lyocell micro fibers; wherein the power of the pulping machine is 49kW, and the pulping time is 7.3 h; the prepared lyocell fiber slurry has a pulping degree of 82 DEG SR and a wet weight of 4.0 g.
The diameter of the lyocell microfiber prepared is 0.1 to 0.5 μm. Fig. 2 shows an optical microscope photograph of the lyocell microfine fibers obtained in example 3, in which the thick strands in fig. 2 are the raw lyocell fibers and the thin strands are the lyocell microfine fibers. The length of the scale in the upper left corner of FIG. 2 is 0.2mm, and ". times.10" in parentheses indicates the objective lens magnification.
Example 4
Taking the lyocell fiber with the length of 38mm as a raw material, and mixing the lyocell fiber with water to form fiber slurry, wherein the pulping concentration of the fiber slurry is 15%;
cutting the fiber pulp by using a high-concentration disc mill, treating the fiber pulp by using a disc mill beater, and beating the fiber pulp by using a stone knife beater to obtain pulp containing lyocell micro-fibers; wherein the power of the disc mill beater is 55kW, and the disc mill beating time is 50 min; the pulping current of the stone knife is 50A, the pulping time of the stone knife is 20h, the pulping degree of the prepared lyocell fiber pulp is 81 degrees SR, and the wet weight is 3.09 g. The diameter of the lyocell microfine fiber prepared in example 4 was 0.1 to 0.5. mu.m.
Application example 1
Preparation of super capacitor diaphragm
The lyocell microfiber-containing slurry prepared in example 1 was used as a microfiber slurry; taking the hemp pulp fiber slurry prepared in the example 2 as a matched fiber slurry, and mixing the micro fiber slurry and the matched fiber slurry to obtain a mixed slurry, wherein the mass ratio of the micro fiber to the matched fiber is 8: 2;
and pumping the mixed slurry into a slurry preparation tank, adding water to dilute the mixed slurry to the total mass concentration of 1.0%, then sending the mixed slurry to a fourdrinier machine for papermaking, and squeezing, drying and calendaring the mixed slurry to obtain the supercapacitor diaphragm.
Through performance detection, the prepared supercapacitor separator has the thickness of 40 mu m, the porosity of 61.5 percent, the average pore diameter of 0.826 mu m and the quantification of 20.0g/m2Tightness of 0.500g/cm3The tensile strength was 0.80/0.41kN/m, and the air permeability was 7.0 s.
The test method of application examples 1-3 of the invention is as follows:
quantification: GB/T451.2-2002; thickness: GB/T451.3-2002; tightness: GB/T451.3-2002; tensile strength: GB/T22898-2008; alkali absorption height: GB/T461.1-2002; the flexibility is as follows: GB/T459-2002.
Application example 2
Preparation of super capacitor diaphragm
The lyocell microfiber-containing slurry prepared in example 3 was used as a microfiber slurry; using Chinese alpine rush fiber pulp as the matched fiber pulp,
the preparation method of the Chinese alpine rush fiber slurry comprises the following steps: mixing Chinese alpine rush fibers with water to form fiber slurry; wherein the length of the Chinese alpine rush fiber is 2.1mm, and the mass concentration of the fiber pulp is 3.2 percent; then treating the fiber pulp by using a disc mill beater to obtain Chinese alpine rush fiber pulp; wherein the power of the pulping machine is 55kW, and the pulping time is 30 min; the prepared Chinese alpine rush fiber pulp has the pulping degree of 40 DEG SR and the wet weight of 4.5 g.
Mixing the micro-fiber slurry and the paper making fiber slurry to obtain mixed slurry, wherein the mass ratio of the micro-fiber to the paper making fiber is 9: 1;
and pumping the mixed slurry into a slurry preparation tank, adding water to dilute the mixed slurry to the total mass concentration of 1.0%, then sending the mixed slurry to a fourdrinier machine for papermaking, and squeezing, drying and calendaring the mixed slurry to obtain the supercapacitor diaphragm.
Through performance detection, the prepared supercapacitor diaphragm has the thickness of 30 mu m, the porosity of 69 percent, the average pore diameter of 0.834 mu m and the quantification of 14.0g/m2The tightness degree is 0.467g/cm3The tensile strength was 0.67/0.33kN/m, and the air permeability was 2.8 s.
Application example 3
Preparation of battery separator
Mixing the lyocell microfiber-containing slurry prepared in example 5, the hydrated cellulose fiber slurry, and the vinylon fiber slurry to form a mixed slurry; wherein the mass ratio of the lyocell fibers to the hydrated cellulose fibers to the vinylon fibers is 10:50: 40;
the preparation method of the hydrolyzed cellulose fiber slurry comprises the following steps: mixing the hydrated cellulose fibers with water to form fiber slurry, wherein the mass concentration of the hydrated cellulose fibers in the fiber slurry is 5.0%; treating the fiber pulp by a steel knife pulping machine to obtain hydrated cellulose fiber pulp; wherein the current of the steel knife beater is 70A, and the beating time is 4 h; the pulping degree of the finally obtained hydrated cellulose fiber is 35 DEG SR, and the wet weight is 5.0 g;
the preparation method of the vinylon fiber slurry comprises the following steps: defibering vinylon in a hydrapulper to obtain vinylon fiber slurry;
pumping mixed slurry containing the lyocell microfiber, the hydrated cellulose fiber and the vinylon fiber into a slurry preparation tank, adding water to dilute until the total mass concentration of the fiber is 1.0%, sending the fiber to a cylinder paper machine for papermaking, and obtaining the battery diaphragm after squeezing, drying and calendaring.
Through performance detection, the thickness of the prepared battery diaphragm is 0.122mm, the porosity is 51.1%, the average pore diameter is 28.9 mu m, and the quantification is 66.5g/m2Tightness of 0.545g/cm3The tensile strength in the longitudinal direction/the transverse direction is 0.86/0.50kN/m, the alkali absorption amount is 470%, the alkali absorption height is 70mm/5min, the alkali absorption shrinkage is 1.5% in the longitudinal direction, and the alkali absorption shrinkage is 2.0% in the transverse direction.
In summary, the present invention provides a fine fiber and a method for preparing the same, and also provides an application of the fine fiber in preparing a separator for an electrical device. The diameter of the micro-fiber provided by the invention is 0.1-0.5 μm; the diaphragm used by the electrical equipment prepared from the superfine fibers has good performance, the thickness of the prepared super capacitor diaphragm is 30-40 mu m, the porosity is 61.5-69%, and the average pore diameter is 0.826-0.834 mu m; the prepared battery separator had a thickness of 0.122mm, a porosity of 51.1%, and an average pore diameter of 28.9 μm.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (1)

1. A preparation method of a diaphragm for electrical equipment is characterized by comprising the following steps:
(a) mixing the micro-fine fibers, the papermaking fibers and water to obtain mixed slurry;
(b) carrying out paper machine papermaking treatment on the mixed slurry to obtain a diaphragm for electrical equipment;
the fiber prepared in the step (a) comprises one or more of hemp pulp fiber, Chinese alpine rush fiber, hydrated cellulose fiber and vinylon fiber;
the mass ratio of the fine fibers to the fibers prepared in the step (a) is 85-90: 10-15;
the total mass concentration of the fibers in the mixed slurry in the step (a) is 0.5-1.5%;
the microfine fibers are obtained by mechanically treating hemp pulp fibers, poly-p-phenylene terephthalamide fibers or regenerated cellulose fibers; the diameter of the micro-fiber is 0.1-0.5 μm;
the preparation method of the micro-fiber comprises the following steps:
(1) mixing a fiber raw material with water to form a fiber slurry; the diameter of the fiber raw material is 10-38 mm, and the fineness of the fiber raw material is 1.4-2.0 Dtex;
(2) mechanically treating the fiber slurry to obtain micro fibers; the mechanical treatment comprises disc grinding pulping and/or stone knife pulping; the disc mill pulping power in the step (2) is 49-55 kW, and the disc mill pulping time is 30 min-7 h;
the current for pulping by the stone knife in the step (2) is 55-65A, and the pulping time of the stone knife is 15-25 h;
when the mechanical treatment is disc mill pulping, the pulping concentration of the fiber pulp is 1.8-3.0%; when the mechanical treatment is stone knife pulping, the pulping concentration of the fiber pulp is 4.8-6.0%.
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