CN103726394A - High-strength carbon fiber shielding paper and preparation method thereof - Google Patents
High-strength carbon fiber shielding paper and preparation method thereof Download PDFInfo
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- CN103726394A CN103726394A CN201310142584.1A CN201310142584A CN103726394A CN 103726394 A CN103726394 A CN 103726394A CN 201310142584 A CN201310142584 A CN 201310142584A CN 103726394 A CN103726394 A CN 103726394A
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Abstract
The invention discloses high-strength carbon fiber shielding paper and a preparation method thereof. The shielding paper comprises carbon fibers, plant fibers and conductive particles, wherein the carbon fibers and the plant fibers are randomly and uniformly distributed in a plane, micron-sized holes are formed among the plurality of fibers to form a three-dimensional reticulated structure, and the conductive particles are existent between the surfaces and the holes of the fibers; the carbon fibers are 1 mm to 20 mm in length; the plant fibers comprise wood fibers, grass plant fibers, bast fibers, seed hair fibers or combination of the wood fibers, the grass plant fibers, the bast fibers and the seed hair fibers; the conductive particles comprise carbon black with the particle size of 1 nm to 100 nm, silver coated copper powder, conductive rubber or combination of the carbon black, the silver coated copper powder and the conductive rubber. The shielding paper has the advantages of uniform porous structure and excellent ventilation property, shielding performance and mechanical strength; in addition, air filter paper can be used to the fields of energy resources, electromagnetic wave shielding, antistatic packaging, adsorption separation, aerospace and the like.
Description
Technical field
The present invention relates to a kind of high-strength carbon fiber shielding paper and preparation method thereof.
Background technology
Carbon fiber is that the phosphorus content that makes through 1300～1600 ℃ of high temperature cabonizations is up to more than 93% new carbon, the characteristic with a series of excellences such as density is little, intensity large, resist chemical, radioresistance, high conduction, high heat conduction, resistance to ablation, thermal expansion are little, physiological compatibility is good, enjoy the attention of industrial quarters, be described as the 4th class industrial materials.In actual applications, carbon fiber is seldom directly applied, and is mostly to make intermediate product or composite use through deep processing.Conductive paper plays an important role in fields such as the antistatic of electronic product, radiation proofs.The functional characteristic of carbon fiber has determined that carbon fiber paper has the performance of a lot of excellences, as uniform Porous laminate structure, electric conductivity are excellent, chemical stability is good, Heat stability is good, water-fast, mechanical property is good etc.
Donghua University discloses in the patent of invention of CN 101591868 B that a kind of to take asphalt base carbon fiber and PAN base preoxidized fiber be main component, through too shortly cutting, wet papermaking moulding, spray a kind of carbon fiber paper that has excellent conductive performance, higher porosity, surfacing close structure and have suitable flexibility and rigidity prepared by the techniques such as adhesive treatment, oven dry, hot pressing, heat treatment.
Beijing University of Chemical Technology discloses a kind of preparation method of carbon fiber paper for gas diffusion layer of fuel cell in the patent of invention of CN 101613982 B.The standby carbon fiber paper of this legal system has higher porosity, gas permeability, electrical conductivity and TENSILE STRENGTH.
Donghua University discloses a kind of with acrylonitrile base carbon fiber and other carbon materialses, to be main raw material, through techniques such as wet papermaking moulding, vacuum drying, emulsion processing, carbonization treatment, to prepare a kind of carbon fiber reinforce plastic paper in the patent of invention of CN 100516359C.
GM Global Technology Operation discloses in the patent of invention of CN 101047253 B a kind ofly to using carbonization acrylic compounds pulp fibres as adhesive material, the carbon fiber paper that carbon fiber is framework material.This carbon fiber paper production technology is simple, can be used for the gas diffusion media in fuel cell.
Carbon fiber belongs to artificial fibre, and fiber surface is random graphits structure, has groove and obvious crack, rough surface.Therefore, fibre-fibre friction power is single fiber compared with being difficult to greatly discrete.Between carbon carbon, with nonpolar covalent bond, be connected, cause carbon fiber surface activity group few, be not easy by water-wet, in water, easily wadding is poly-, and dispersive property is poor.In addition, between carbon fiber, can not produce Hydrogenbond, between fiber without bond strength, cannot copy paper.The deployment conditions of fiber in water is to affect the most important factor of formation of sheet.And formation of sheet can have influence on other performances of paper, as intensity, capability of electromagnetic shielding, outward appearance etc.Therefore, the dispersiveness of research carbon fiber in water, is the key technology of preparing carbon fiber paper.
In addition, the shielding properties of carbon fiber screen-wall paper is high not enough, can not in a wider wave frequency section, keep higher shield effectiveness.The content that improves carbon fiber can not make the shielding properties of page be greatly improved, and grievous injury the mechanical property of page, thereby limited the further application of carbon fiber paper in the higher field of shielding requirements (as occasions such as military project, space flight, aviations).Therefore, the carbon fiber of take is merely difficult to realize high-performance shielding and wideband shields as conductive material, must improve by means of other electromagnetic shielding materials the shielding properties of electric conduction of carbon fiber screen-wall paper, enable to realize high-performance shielding and wideband shielding, be applied to better various shielding occasion.
Summary of the invention
Technical problem to be solved by this invention is to overcome the shortcomings such as existing carbon fiber paper intensity is low, shielding properties is poor, the wave frequency section of shielding is narrow, a kind of high-strength carbon fiber shielding paper and preparation method thereof is provided, and this kind of high-strength carbon fiber shielding paper can be widely used in the fields such as the energy, electromagnetic wave shielding, antistatic packaging, adsorbing separation, Aero-Space.
For addressing the above problem, the invention provides a kind of high-strength carbon fiber shielding paper, this high-strength carbon fiber shielding paper is comprised of carbon fiber, string and conductive particle, described carbon fiber and string be uniform random distribution in a plane, between a plurality of fibers, form micron-sized hole, form tridimensional network, conductive particle is present between fiber surface and fiber hole.
String is combined by lumber fibre or straw or like vegetable fiber or bast fiber or seed hair fiber or they.Conductive particle is combined by carbon black or silver-coated copper powder or conductive rubber or they.The length of carbon fiber is 1mm～20mm.Conductive particle particle diameter is between 1nm～100nm.String and carbon fiber are brought into play different effects in paper.Between string, form chemical bonds, for improving dry, the wet tensile (strength) of paper, form the basic framework of paper; Between carbon fiber, form conductive network path, the capability of electromagnetic shielding of paper is provided.In carbon fiber paper, add conducting particles, with this, improve the electric conductivity of page, improve the shielding properties of page, expand the range of application of shielding paper.
In order to address the above problem, the present invention also provides a kind of preparation method of above-mentioned high-strength carbon fiber shielding paper, it is characterized in that comprising the step of following order:
(1) carbon fiber or string or both combinations are joined in beater and disperseed, take water as dispersant and solvent, carbon fiber and plant fiber material are dissociated into cotton pulp;
(2) cotton pulp, plain boiled water solution are delivered to the processing of stirring and remove the gred in pond with slurry, the solid content in slurry is controlled at 0.1%～0.3% (weight), and viscosity is controlled at 8CP～12CP, and PH is controlled at 4～8, and air content is controlled at 4%～10%;
(3) conductive powder is joined in homogenizer and fully disperse;
(4) conductive powder solution and cotton pulp solution are delivered in mixed stock tank dispersed;
(5) homodisperse mixed slurry is delivered on the screen pack of twin-wire press and manufactures paper with pulp, THICKNESS CONTROL between 0.1～2mm, the gains of manufacturing paper with pulp carry out vacuum draw dewater and squeeze after make ground paper;
(6) ground paper is entered to oven for drying, 10～30 meters of baking oven length, baking oven central temperature is between 100～250 ℃, baking oven entrance and baking oven outlet are semiclosed, in whole baking oven, the low feature in high both sides in the middle of temperature presents according to length direction, drying time is controlled between 5～25min;
(7) dried paper is cut, obtain the carbon fiber finished paper of different size and model.
Plain boiled water solution described in the present invention is mixed by pure water, hydroxyethylcellulose, polyacrylamide and tributyl phosphate.In order to realize the filter effect of different brackets of the present invention, the beating degree of above-mentioned carbon fiber is 10～80 ° of SR.
Compare with existing carbon fiber shielding paper and preparation method thereof, the invention has the advantages that: in (1) a kind of high-strength carbon fiber shielding paper of the present invention, there is uniform porous structure, excellent gas permeability and low resistivity, advantages of good shielding performance, the wave frequency section of shielding is wide; (2) close structure and surfacing, have very high mechanical strength; (3) there is extremely excellent chemical stability and heat endurance.
Specific implementation method
Below in conjunction with specific embodiment, further illustrate the present invention, should understand these embodiment is only not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims to the modification of the various equivalent form of values of the present invention and limit.
Embodiment 1
80 parts of carbon fibers and 15 parts of strings are joined in beater and disperseed, take water as dispersant and solvent, carbon fiber and plant fiber material are dissociated into cotton pulp;
Cotton pulp, plain boiled water solution are delivered to the processing of stirring and remove the gred in pond with slurry, and the solid content in slurry is controlled at 0.3% (weight), and viscosity is controlled at 8CP, and PH is controlled at 7, and air content is controlled at 6%;
5 parts of conductive powders are joined in homogenizer and fully disperseed;
Conductive powder solution and cotton pulp solution are delivered in mixed stock tank dispersed;
Homodisperse mixed slurry is delivered on the screen pack of twin-wire press and manufactures paper with pulp, THICKNESS CONTROL is at 0.1mm, the gains of manufacturing paper with pulp carry out vacuum draw dewater and squeeze after make ground paper;
Ground paper is entered to oven for drying, 30 meters of baking oven length, baking oven central temperature is at 250 ℃, and baking oven entrance and baking oven outlet are semiclosed, in whole baking oven, the low feature in high both sides in the middle of temperature presents according to length direction, drying time is controlled at 20min;
Dried paper is cut, obtain the carbon fiber finished paper of different size and model.
In the present embodiment, plain boiled water is recycled, there is the feature of environmental protection.The porosity of a kind of high-strength carbon fiber shielding paper preparing is 90%, and hole is little and be evenly distributed in paper inside.
Embodiment 2
75 parts of carbon fibers and 17 parts of strings are joined in beater and disperseed, take water as dispersant and solvent, carbon fiber and plant fiber material are dissociated into cotton pulp;
Cotton pulp, plain boiled water solution are delivered to the processing of stirring and remove the gred in pond with slurry, and the solid content in slurry is controlled at 0.25% (weight), and viscosity is controlled at 10CP, and PH is controlled at 7, and air content is controlled at 7%;
8 parts of conductive powders are joined in homogenizer and fully disperseed;
Conductive powder solution and cotton pulp solution are delivered in mixed stock tank dispersed;
Homodisperse mixed slurry is delivered on the screen pack of twin-wire press and manufactures paper with pulp, THICKNESS CONTROL is at 0.2mm, the gains of manufacturing paper with pulp carry out vacuum draw dewater and squeeze after make ground paper;
Ground paper is entered to oven for drying, 30 meters of baking oven length, baking oven central temperature is at 200 ℃, and baking oven entrance and baking oven outlet are semiclosed, in whole baking oven, the low feature in high both sides in the middle of temperature presents according to length direction, drying time is controlled at 25min;
Dried paper is cut, obtain the carbon fiber finished paper of different size and model.
Above are only several specific embodiment of the present invention, but design concept of the present invention is not limited to this, allly utilizes this design to carry out the change of unsubstantiality to the present invention, all should belong to the behavior of invading the scope of protection of the invention.
Claims (7)
1. a high-strength carbon fiber shielding paper, it is characterized in that being formed by carbon fiber, string and conductive particle, described carbon fiber and string be uniform random distribution in a plane, between a plurality of fibers, form micron-sized hole, form tridimensional network, conductive particle is present between fiber surface and fiber hole.
2. high-strength carbon fiber shielding paper according to claim 1, is characterized in that the length of described carbon fiber is 1mm～20mm.
3. high-strength carbon fiber shielding paper according to claim 1, is characterized in that string combining by lumber fibre or straw or like vegetable fiber or bast fiber or seed hair fiber or they.
4. high-strength carbon fiber shielding paper according to claim 1, is characterized in that conductive particle combining by carbon black or silver-coated copper powder or conductive rubber or they.
5. high-strength carbon fiber shielding paper according to claim 1, is characterized in that described conductive particle particle diameter is between 1nm～100nm.
6. a preparation method for high-strength carbon fiber shielding paper, is characterized in that comprising the step of following order:
(1) carbon fiber or string or both combinations are joined in beater and disperseed, take water as dispersant and solvent, carbon fiber and plant fiber material are dissociated into cotton pulp;
(2) cotton pulp, plain boiled water solution are delivered to the processing of stirring and remove the gred in pond with slurry, the solid content in slurry is controlled at 0.1%～0.3% (weight), and viscosity is controlled at 8CP～12CP, and PH is controlled at 4～8, and air content is controlled at 4%～10%;
(3) conductive powder is joined in homogenizer and fully disperse;
(4) conductive powder solution and cotton pulp solution are delivered in mixed stock tank dispersed;
(5) homodisperse mixed slurry is delivered on the screen pack of twin-wire press and manufactures paper with pulp, THICKNESS CONTROL between 0.1～2mm, the gains of manufacturing paper with pulp carry out vacuum draw dewater and squeeze after make ground paper;
(6) ground paper is entered to oven for drying, 10～30 meters of baking oven length, baking oven central temperature is between 100～250 ℃, baking oven entrance and baking oven outlet are semiclosed, in whole baking oven, the low feature in high both sides in the middle of temperature presents according to length direction, drying time is controlled between 5～25min;
(7) dried paper is cut, obtain the carbon fiber finished paper of different size and model.
7. plain boiled water solution according to claim 4, is characterized in that described plain boiled water solution is mixed by pure water, hydroxyethylcellulose, polyacrylamide and tributyl phosphate.
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| CN201310142584.1A CN103726394A (en) | 2013-04-22 | 2013-04-22 | High-strength carbon fiber shielding paper and preparation method thereof |
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| CN201310142584.1A CN103726394A (en) | 2013-04-22 | 2013-04-22 | High-strength carbon fiber shielding paper and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404814A (en) * | 2014-09-10 | 2015-03-11 | 华南理工大学 | Wave-absorbing paper and preparation method and application thereof |
| CN104562853A (en) * | 2014-12-17 | 2015-04-29 | 中国建筑材料科学研究总院 | Electromagnetic compatibility wrapping paper and preparation method thereof |
| CN105274896A (en) * | 2015-11-09 | 2016-01-27 | 中国林业科学研究院林产化学工业研究所 | Preparation method and evenness measurement method for carbon fiber synthetic paper |
| CN105384456A (en) * | 2014-09-02 | 2016-03-09 | 霍尼韦尔国际公司 | Sacrificial fibers to create channels in composite material |
| CN107447584A (en) * | 2017-08-03 | 2017-12-08 | 华南理工大学 | A kind of high-performance conductive paper and preparation method thereof |
| CN110644286A (en) * | 2019-09-19 | 2020-01-03 | 山东华泰纸业股份有限公司 | High-heat-conduction anti-static thermal sublimation transfer printing paper |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105384456A (en) * | 2014-09-02 | 2016-03-09 | 霍尼韦尔国际公司 | Sacrificial fibers to create channels in composite material |
| CN104404814A (en) * | 2014-09-10 | 2015-03-11 | 华南理工大学 | Wave-absorbing paper and preparation method and application thereof |
| CN104404814B (en) * | 2014-09-10 | 2018-01-19 | 华南理工大学 | Inhale ripple paper and its preparation method and application |
| CN104562853A (en) * | 2014-12-17 | 2015-04-29 | 中国建筑材料科学研究总院 | Electromagnetic compatibility wrapping paper and preparation method thereof |
| CN105274896A (en) * | 2015-11-09 | 2016-01-27 | 中国林业科学研究院林产化学工业研究所 | Preparation method and evenness measurement method for carbon fiber synthetic paper |
| CN107447584A (en) * | 2017-08-03 | 2017-12-08 | 华南理工大学 | A kind of high-performance conductive paper and preparation method thereof |
| CN107447584B (en) * | 2017-08-03 | 2020-02-18 | 华南理工大学 | High-performance conductive paper and preparation method thereof |
| CN110644286A (en) * | 2019-09-19 | 2020-01-03 | 山东华泰纸业股份有限公司 | High-heat-conduction anti-static thermal sublimation transfer printing paper |
| CN110644286B (en) * | 2019-09-19 | 2021-10-08 | 山东华泰纸业股份有限公司 | High-heat-conduction anti-static thermal sublimation transfer printing paper |
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Application publication date: 20140416 |