CN104343041A - Preparation method of meta-aramid paper - Google Patents
Preparation method of meta-aramid paper Download PDFInfo
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- CN104343041A CN104343041A CN201410542672.5A CN201410542672A CN104343041A CN 104343041 A CN104343041 A CN 104343041A CN 201410542672 A CN201410542672 A CN 201410542672A CN 104343041 A CN104343041 A CN 104343041A
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Abstract
The invention provides a preparation method of meta-aramid paper. The preparation method comprises the specific steps: defibering aramid chopped fiber by a hydrapulper, then defibering by a high-frequency defibering machine, thus obtaining aramid chopped fiber pulp for later use; adding aramid fibrid into a hydraulic-jet dispersion device to disperse into aramid fibrid pulp; firstly defibering the aramid fibrid pulp by the hydrapulper, and screening the pulp by a centrifugal pulp screening machine, thus obtaining pulp passing through the screening mesh and fibrid without passing through the screening mesh; mixing the pulp passing through the screening mesh and the defibered aramid chopped fiber pulp obtained from the step (1), thus obtaining mixed pulp; and without adding additives, directly treating the mixed pulp by papermaking on the mesh, squeezing, dewatering, drying to obtain base paper, and hot pressing to obtain the meta-aramid paper. The preparation method provided by the invention has the advantages that the aramid fibrid is fully defibered by utilizing hydraulic-jet and hydra-pulping process, so that the benefit to improving the evenness and the property of the paper is realized.
Description
Technical field
The present invention relates to a kind of preparation technology of meta-position aramid fiber paper, belong to technical field of preparation of specialty paper.
Background technology
The sixties in last century E.I.Du Pont Company with meta-aramid staple fiber and fibrid for NOMEX paper successfully developed by raw material.High temperature resistant and the good electrical insulation of NOMEX paper, is not fully exerted in High Performance Insulation material, is the indispensable material of the novel electrical product such as high performance motor, dry-type transformer.In the past between decades, aramid paper market almost monopolize by E.I.Du Pont Company.E.I.Du Pont Company is different according to purposes, develop the NOMEX paper of different model, wherein the most frequently used several models are T411 (T410 is without the body paper of hot rolling), T410 (the insulation paper using of hot rolling), T414 (the insulation paper using of hot rolling technology different from T410), T412 (honeycomb paper using) etc.
In recent years, the calm and peaceful new material in Yantai (former Yantai spandex group) achieves the suitability for industrialized production of meta-position aramid fiber paper and occupies certain market at home.But still there is certain otherness with external product in any surface finish smoothness, page density, product stability and uniformity, strength and modulus and insulating properties in the aramid paper of domestic production.
The preparation of meta-position aramid fiber paper generally with meta-aramid staple fiber and meta-aramid fibre fibrid or meta-aramid pulp for raw material is prepared through shaping, the high temperature press polish of manufacturing paper with pulp.
Meta-aramid staple fiber is generally the short section fibre be cut into by filament fiber.In meta-position aramid fiber paper, the crisscross blown pattern of staple fiber, in page, plays humidification, makes paper have higher mechanical strength and impart tear.Between position fibrid by fibre-forming polymer solution through nozzle flow into High Rotation Speed precipitating agent in, under the effect of Strong shear power, polymer dispersed is solidified as the thin fiber floccule of two-dimensional structure.It rises between staple fibre and fills and cementation in meta-position aramid fiber paper page structure.
Between position fibrid conveniently to store and transport can make the fibrid of moisture content about 90% after dehydration.Owing to there is much tiny fiber floccule in fibrid, expose more amido link, when dehydrating, being easy to form Hydrogenbond, making between fiber, to produce very strong adhesion, dried fibrid, easily caking, hardening.Therefore, must do and discongest fully by position fibrid between carrying out before aramid paper is manufactured paper with pulp pair, the existence of block fibrid in the minimizing slurry of maximum.Exist if any a large amount of block fibrid, then can cause the evenness of aramid paper and greatly affect, body paper surface can be caused simultaneously easily to fall graininess powder, affect serviceability.
Application number: propose the later stage in Fanglun slurry cake making beating or defibrination in the Chinese invention patent of 201110237044, the surfactant of stock quality 0.5 ~ 20% is added and hybrid reaction 1 ~ 30min in slurry, dewater subsequently, obtain super fluffy, soft, easily disperse, there is good interfacial combined function and the PPTA-pulp of processing characteristics.And introduce shredding degree and the lofting effect that fiber loose bulk density (also known as the fiber coefficient of volumetric expansion) evaluates pulp.But introduce surfactant due to too much in processing procedure, cause producing a large amount of foams mixing in process with slurry with aramid fiber, cause in body paper and there is either large or small eyelet or pin hole, affect product insulating properties.
Application number: the Chinese patent of 201310506781 discloses one and utilizes sound wave processor preliminary treatment aramid fiber fibrid, then is pulled an oar by trough-style pulp beater, controls the method for beating degree at 35 ~ 55 ° of SR of fibrid.And this pulp is coordinated with surface treated p-aramid fiber staple fiber manufacture paper with pulp.But do not sieve Fanglun slurry cake in patent, this is also by the serviceability of the evenness and product that affect into paper.
Application number: the Chinese patent of 201210375644 discloses a kind of method of adding 50 ~ 100 object PPTA-pulp slurries in aramid fiber and aramid fiber pulp and to manufacture paper with pulp aramid paper.The interpolation passing through the pulp of screening reduces the span of Fanglun slurry cake length, width distribution, the pulp obtained has distribution of lengths, width distribution and the larger specific area more concentrated, it is made to coordinate in the process of manufacturing paper with pulp with staple fiber, better can combine with aramid short fiber as packing material, fill up page space.
Application number: dilute aramid fiber, Fanglun slurry cake and aramid fiber fibrid after the Chinese patent of 201310232645 discloses a kind of high-speed stirred, and under the concentration of 0.5% and 1%, pass through the selectifier of characteristic screen sizes respectively, to obtain the method for finely dispersed slurry.The method that above-mentioned two patents are screened by filter screen is evenly distributed, the slurry of good dispersion, is conducive to the evenness of paper and the raising of properties of product.But above-mentioned two kinds of methods are all not mentioned is further processed recycling to the large grained fibrid after screening out or pulp, and this causes certain waste to raw material.
Summary of the invention
The object of this invention is to provide a kind of with the preparation method of meta-aramid staple fiber and the meta-aramid fibre fibrid meta-position aramid fiber paper that is raw material.Emphasis of the present invention is that solving aramid fiber fibrid discongests difficult problem, by the fibrid of discongesting out and staple fiber mixing for standby use after hydraulic jet dispersion-hydraulic pulping-centrifugal screening the pulp, the block fibrid by being separated is delivered to hydraulic pulping workshop section further and is continued flow process after cutting action process.Through the discongesting of multiple working procedure, sieve, dispersiveness and homogeneity that circular treatment not only can guarantee the excellence of the fibrid for paper of manufacturing paper with pulp, circular treatment difficulty discongests the utilization rate that block fibrid also can improve raw material simultaneously, reduce costs, avoid waste.Can obtain evenness by preparation technology of the present invention good, surface smoothness is high, the aramid paper of mechanical performance and excellent insulation performance.
In order to achieve the above object, the invention provides a kind of preparation method of meta-position aramid fiber paper, it is characterized in that, concrete steps comprise:
Step 1: discongested through deflaker after hydrabrusher size degradation by aramid short fiber, obtains aramid short fiber slurry, for subsequent use;
Step 2: aramid fiber fibrid is added hydraulic jet dispersal device and be dispersed into aramid fiber fibrid slurry;
Step 3: aramid fiber fibrid slurry is first discongested through hydrabrusher, then carry out screening the pulp by centrifugal sereen, obtain by the slurry of screen cloth with not by the fibrid of screen cloth;
Step 4: by obtained by the slurry of screen cloth and step 1 discongest after aramid short fiber slurry mix, obtain mixed slurry;
Step 5: mixed slurry is not added auxiliary agent, directly through online manufacture paper with pulp, press dewatering, drying, obtain body paper, after hot pressing, obtain meta-position aramid fiber paper.
Preferably, described step 4 also comprises to be cut off the fibrid input steep-taper conical refiner not by screen cloth, and making beating formation aramid fiber fibrid slurry returns step 3 and carries out circular treatment.
Preferably, described aramid short fiber is that the section obtain through spray silk, heat-traction and cut-out is ellipse, diameter 12 ~ 25 microns, length is the aramid short fiber of 4 ~ 6mm.Described aramid short fiber has good dispersion and stiffness, smooth surface, does not therefore need discongest at fiber and add the chemical assistants such as dispersant in process of manufacturing paper with pulp.
Preferably, the hydrabrusher in described step 1 is vertical or horizontal hydraulic pulper, and the concentration of the slurry in hydrabrusher is 5%.
Preferably, described hydraulic jet dispersal device comprises hopper, blanking valve, hydraulic jeting device and inlet pipeline, and inlet pipeline connects hydraulic jeting device nozzle, and blanking valve connects the suction chamber of hopper and hydraulic jeting device respectively.
More preferably, described inlet pipeline is provided with electromagnetic flowmeter and electromagnetic valve.
Preferably, in described step 2, before entering hydraulic jet dispersal device, the moisture content of aramid fiber fibrid is 80% ~ 90%, before hydraulic jet dispersal device is opened, by aramid fiber fibrid with 8% concentration in hopper, soak 0.5 ~ 2h, the pulp concentration of described hydraulic jet dispersal device is 0.8% ~ 3%, and intake pressure is 500 ~ 3000Pa, and nozzle diameter is 0.3 ~ 1mm.
Preferably, the hydrabrusher in described step 3 is vertical pulper, and described vertical pulper comprises shell, is provided with rotor in shell, and described rotor and model are that the structure of the rotor of the agitator of HR2004 is identical.
More preferably, described shell inner top is provided with spray equipment, and described spray equipment comprises four jet pipes, every root jet pipe is equipped with five equidistant nozzles.
More preferably, the injection direction of described nozzle and the angle α of vertical direction are 45-60 °, are close to pulper sidewall.
Preferably, the rotating speed of described hydrabrusher is 10000 ~ 20000 revs/min, and the time of discongesting is 1 ~ 5min.
Preferably, the centrifugal speed of described centrifugal sereen is 500 ~ 2000 revs/min, and screen cloth is wherein 10 ~ 100 object polyester screen.Lower centrifugal speed is conducive to the carrying out of separation process, can avoid the unity again caused because of centrifugal action simultaneously.
Preferably, the fibrid not by screen cloth in described step 3 accounts for 0.5 ~ 10% of total aramid fiber fibrid slurry, is 35 ~ 45 ° of SR by the beating degree of the slurry of screen cloth.
Preferably, the cycle-index in described step 4 can judge according to residual slurry amount in separator and residual slurry form, general 1 ~ 2 time.
Described aramid short fiber is different and different according to the purposes of paper from the over dry charge ratio of fibrid, preferably, when preparing insulation paper using, the oven dry weight of aramid short fiber accounts for 40% ~ 60% of total oven dry weight of aramid short fiber and aramid fiber fibrid, does not add other chemical fibres in described mixed slurry.
Preferably, described step 5 is specially: mixed slurry is not added auxiliary agent, on oblique net or cylinder mould machine, directly carries out wet method manufacture paper with pulp, and after squeezing, drying, obtains the body paper that thickness is 100 ~ 140 microns.Body paper is carried out hot pressing through upper and lower two steel rider hot press, and upper roll temperature is 110 ~ 170 DEG C, and lower roll temperatures is 260 ~ 320 DEG C, and linear pressure is 20 ~ 70kg/cm, and roller speed is 5.0 ~ 12.0m/min.Obtain aramid paper.
The chemical assistant such as dispersant, defoamer is not added after described fibrid slurry mixes with aramid short fiber slurry.
The present invention carries out the circular treatment of hydraulic jet-hydraulic pulping-centrifugal screening the pulp-cutting type making beating by the fibrid of commute unity, is conducive to dispersed in the process of manufacturing paper with pulp of fibrid, and there is not thick slurry and roll into a ball.Fibrid is tiny flake, very easily mutually twists together in dehydration, agglomerating.And the more amido link exposed in fibrid makes it be easy to each other form Hydrogenbond, has very strong adhesion.Once fibrid forms slurry group, lump in the process of dehydration, be just difficult to be disperseed by conventional carding process.The feature that fibrid itself is tiny simultaneously makes it not easily directly adopt strong cutting, chopping process, otherwise the intensity affecting paper that can be serious.This patent by controlling the speed of front 3 workshop sections, the time guarantees effectively discongesting of most of fibrid, and utilize the making beating of the cutting type of control capable of circulation to process a small amount of difficult caking, under the prerequisite not affecting paper performance, ensure making full use of of material.
Compared with prior art, the invention has the beneficial effects as follows:
(1) the present invention utilizes hydraulic jet and hydraulic pulping technique to discongest fully aramid fiber fibrid, and guarantees dimensional homogeneity and the stability of fibrid by sieving technology, is conducive to the evenness and the performance that improve paper.In addition, effectively discongest the dispersiveness that improve slurry, avoid the interpolation of chemical assistant, reduce the cost of paper, it also avoid the impact of the non-positive that chemical assistant produces.
(2) in the present invention difficult block fibrid through discongesting-sieve-cut off-discongest circulation technology process again after effectively can be down to fiber fines, it is used for manufacturing paper with pulp of aramid paper with discongesting after good fibrid mixes, both improve the utilization rate of fibrid, accurately control again the mass ratio of aramid short fiber and fibrid.
Accompanying drawing explanation
Fig. 1 is the process chart of the preparation method of a kind of meta-position aramid fiber paper of the present invention;
Fig. 2 a is hydraulic jet dispersal device structural representation;
Fig. 2 b is hydraulic jeting device structural representation,
Fig. 3 a is hydrabrusher structural representation;
Fig. 3 b is the top view of hydrabrusher.
Fig. 4 is centrifugal sereen structural representation;
Fig. 5 is surface and the cross-sectional scans Electronic Speculum figure of aramid short fiber;
Fig. 6 is the microscope figure of the fibrid on (left side), rear (right side) before discongesting;
Fig. 7 a is that the HC01 of the preparation method of a kind of meta-position aramid fiber paper of the present invention becomes paper scanning electron microscope (SEM) photograph.
Fig. 7 b is that the HC02 of the preparation method of a kind of meta-position aramid fiber paper of the present invention becomes paper scanning electron microscope (SEM) photograph.
In Fig. 2 a, 1-hopper, 2-blanking valve, 3-hydraulic jeting device, 4-inlet pipeline, 5-flow controller, 6-Pressure gauge, 7-electromagnetic flowmeter, 8-electromagnetic valve.
In Fig. 2 b, 3-1-import, 3-2-nozzle, 3-3-feed opening, 3-4-suction chamber, 3-5-trunnion, 3-6-anemostat, 3-7-exports.
In Fig. 3 b, 9-spray equipment, 10-shower, 11-nozzle, 12-rotor.
In Fig. 4,13-charging aperture, 14-is by screening slurry outlet, and 15-is not by screening slurry outlet.
Detailed description of the invention
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Embodiment 1
As shown in Figure 2 a, for hydraulic jet dispersal device sketch, described hydraulic jet dispersal device comprises hopper 1, blanking valve 2, hydraulic jeting device 3 and inlet pipeline 4, inlet pipeline 4 is provided with electromagnetic flowmeter 7 and electromagnetic valve 8, inlet pipeline 4 connects hydraulic jeting device nozzle, connecting line between inlet pipeline 4 and blanking valve 2 is provided with flow controller 5, connecting line between the nozzle entrance of inlet pipeline 4 and hydraulic jeting device 3 is provided with Pressure gauge 6, and blanking valve 2 connects the suction chamber of hopper 1 and hydraulic jeting device 3 respectively.
As shown in Figure 2 b, for hydraulic jeting device structure chart, described hydraulic jeting device comprises import 3-1, nozzle 3-2, suction chamber 3-4, trunnion 3-5, anemostat 3-6 and outlet 3-7, the entrance point of nozzle 3-2 connects import 3-1, the port of export of nozzle 3-2 is located in suction chamber 3-4, one end of trunnion 3-5 connects suction chamber 3-4, and the other end connects anemostat 3-6, anemostat 3-6 connection outlet 3-7.Suction chamber 3-4 connects feed opening 3-3.Water under high pressure enters from import 3-1, spray through nozzle 3-2, and form negative pressure in suction chamber 3-4, force slurry to enter from feed opening 3-3, enter trunnion 3-5 with disposed slurry through Strong shear power to accelerate and anemostat 3-6 reduction of speed, form finely disseminated slurry and enter next workshop section from outlet 3-7.The diameter of the port of export of the nozzle of hydraulic jeting device is 0.5mm.
Hydraulic jet dispersal device of the present invention carries out improving obtaining based on the device of directly dispersing polymer dry powder by hydraulic jet disclosed in Chinese patent CN200620021767, eliminates screw(-type) feeder on its basis, do not comprise slaking tank part.The device of original directly dispersing polymer dry powder by hydraulic jet is used for dispersion and the pigment mixing of oil exploitation later stage tertiary oil recovery field interpolymer.The operation principle of hydraulic jet dispersal device of the present invention is: water body sprays through the nozzle high speed of inlet pipeline 4 from hydraulic jeting device 3 after the pressurization of super-pressure pressurizer, too high flow velocity makes the exit of nozzle form negative pressure, forces the slurry in hopper 1 to enter hydraulic jeting device.High-velocity flow in device forms strong eddy current, plays impact and stirring action, the slurry of unity is scatter, meanwhile, can avoid the entanglement again between slurry under the existence of liquid water the slurry be mixed into.
The advantage of above-mentioned hydraulic jet dispersal device is: electromagnetic flowmeter 7, electromagnetic valve 8, Pressure gauge 6, flow controller 5 etc. can effectively control slurry concentration and intake pressure.Pressurised stream enters in hydraulic jeting device through pipeline and forms eddy current, forms stable vacuum; Open hopper 1 and blanking valve 2, current enter hopper and form rotary water current, rinse feeding funnel inner; Material body is inhaled in the suction chamber of hydraulic jeting device by hopper, forms violent cutting stirring action, makes to be separated from each other between material body, expect that body is fully wetting by water simultaneously with eddy current to suction material body.
Embodiment 2
As shown in Figure 3 a, for hydrabrusher sketch, described hydrabrusher is vertical pulper, it comprises shell, be provided with rotor 12 in shell, described rotor 12 and model are that the structure of the rotor of the agitator of HR2004 is identical, are namely made up of five blades, the side of blade is crenation, and sawtooth is gradually thin from inside to outside.Wherein two panels blade be upturned with level be respectively 15 ° with 30 °, two blades are downward-sloping with level be respectively 15 ° with 30 °, a blade maintenance level.Described shell inner top is provided with spray equipment 9, and described spray equipment comprises four jet pipes 10, every root jet pipe is equipped with five equidistant nozzles 11, and the injection direction of described nozzle and the angle α of vertical direction are 60 °, are close to pulper sidewall.The slurry broken up through hydraulic jet dispersal device enters hydrabrusher, opens pulper and stirs.To work 10s every 1 minute spray equipment 9, terminate until stir, motor cuts out.The object of spray is to rinse the slurry hanging over outer wall due to stirring, makes slurry more even.
Embodiment 3
A kind of insulation uses the preparation method of meta-position aramid fiber paper, adopt aramid short fiber and aramid fiber fibrid, to be that Saehan group of Korea S 2D × 6mm is short cut position fiber between aramid fiber, smooth surface, ellipsoidal cross section (see Fig. 5 aramid fiber scanning electron microscope (SEM) photograph) to aramid short fiber.Position fibrid between Saehan group of aramid fiber fibrid Korea S moisture content 80%.Concrete steps are:
(1) the discongesting of meta-aramid staple fiber:
Get aramid short fiber and add treated underground water in Conventional upright hydrabrusher, being diluted to concentration is that 5% rear stirring discongests 15min.It is discongest 20min through deflaker after 3% that fibre stuff is diluted to concentration further, for subsequent use.
(2) the discongesting of meta-aramid fibre fibrid:
The aramid fiber fibrid being 80% by moisture content joins in the hopper 1 of the hydraulic jet dispersal device described in embodiment 1, thin up is to concentration 8%, after soaking 2h, open blanking valve 2, adjustment intake pressure is 3000Pa, the mass ratio controlling the discharge and slurry that enter system with flow controller 5 is 1: 10, and aramid fiber fibrid is dispersed into aramid fiber fibrid slurry, the pulp concentration of described hydraulic jet dispersal device is 0.8%.
Discongested through the hydrabrusher described in embodiment 2 by aramid fiber fibrid slurry, the rotating speed of hydrabrusher is 10000 revs/min, and the time of discongesting is 3min.Spray equipment is opened after agitating device opened for 5 seconds.
Aramid fiber fibrid slurry after discongesting is carried out screening the pulp by commercially available centrifugal sereen as shown in Figure 4, centrifugal speed controls at 1000 revs/min, screen cloth is 100 object polyester screen, obtain by the slurry of screen cloth with not by the fibrid of screen cloth, exported from thin slurry outlet 14 by the slurry of screen cloth, do not exported from coarse particles outlet 15 by the fibrid of screen cloth, fibrid not by screen cloth is entered steep-taper conical refiner to cut off, again hydrabrusher is delivered to and centrifugal sereen sieves after making beating 5min, do not thrown aside by the fibrid of screen cloth.Merge the slurry of twice separation by screen cloth, beating degree is 40 ° of SR.The microscope figure (right side) of the pulp after the microscope figure (left side) of initial pulp and multistage discongest process is shown in Fig. 6.
(3) paper and body paper hot pressing is manufactured paper with pulp into
The aramid short fiber of discongesting respectively and fibrid are mixed, according to percentage by weight (over dry): aramid short fiber 40%, aramid fiber fibrid 60%.Mixed slurry is carried out on cylinder mould machine wet method to manufacture paper with pulp, online concentration is 0.05%, after squeezing, drying, obtains the body paper HC01 that thickness is 130 microns.Body paper is carried out hot pressing through upper and lower two steel rider hot press, and upper roll temperature is 160 DEG C, and lower roll temperatures is 290 DEG C, and linear pressure is 55kg/cm, and roller speed is 10m/min.Obtain aramid paper HC02.The 80X scanning electron microscope (SEM) photograph of aramid paper HC01 and HC02 is shown in Fig. 7 a and 7b.
Table one HC01 and HC02 meta-position aramid fiber paper performance indications
| Index | Unit | HC01 | HC02 |
| Thickness | mm | 0.13 | 0.05 |
| Quantitatively | g/m2 | 43.0 | 43.0 |
| Density | g/cm3 | 0.33 | 0.86 |
| Machine direction tensile strength | kN/m | 1.91 | 3.77 |
| Cross direction tensile strength | kN/m | 0.86 | 1.82 |
| Longitudinal tensile strain rate | ％ | 3.72 | 7.12 |
| Cross direction elongation | ％ | 5.10 | 8.96 |
| Longitudinal tear degree | N | 1.08 | 0.69 |
| Horizontal tearability | N | 1.51 | 1.23 |
| Dielectric strength | kV/mm | 9.0 | 20.7 |
| Relative dielectric constant | / | 1.2 | 1.7 |
| Dielectric loss factor | ％ | 2.1 | 2.9 |
Claims (10)
1. a preparation method for meta-position aramid fiber paper, is characterized in that, concrete steps comprise:
Step 1: discongested through deflaker after hydrabrusher is discongested by aramid short fiber, obtains aramid short fiber slurry, for subsequent use;
Step 2: aramid fiber fibrid is added hydraulic jet dispersal device and be dispersed into aramid fiber fibrid slurry;
Step 3: aramid fiber fibrid slurry is first discongested through hydrabrusher, then carry out screening the pulp by centrifugal sereen, obtain by the slurry of screen cloth with not by the fibrid of screen cloth;
Step 4: by obtained by the slurry of screen cloth and step 1 discongest after aramid short fiber slurry mix, obtain mixed slurry;
Step 5: mixed slurry is not added auxiliary agent, directly through online manufacture paper with pulp, press dewatering, drying, obtain body paper, after hot pressing, obtain meta-position aramid fiber paper.
2. the preparation method of meta-position aramid fiber paper as claimed in claim 1, it is characterized in that, described step 4 also comprises to be cut off the fibrid input steep-taper conical refiner not by screen cloth, and making beating formation aramid fiber fibrid slurry returns step 3 and carries out circular treatment.
3. the preparation method of meta-position aramid fiber paper as claimed in claim 1, is characterized in that, described aramid short fiber is that the section obtain through spray silk, heat-traction and cut-out is ellipse, diameter 12 ~ 25 microns, length is the aramid short fiber of 4 ~ 6mm.
4. the preparation method of meta-position aramid fiber paper as claimed in claim 1, it is characterized in that, described hydraulic jet dispersal device comprises hopper (1), blanking valve (2), hydraulic jeting device (3) and inlet pipeline (4), inlet pipeline (4) connects the nozzle entrance of hydraulic jeting device (3), and blanking valve (2) connects the suction chamber of hopper (1) and hydraulic jeting device (3) respectively.
5. the preparation method of meta-position aramid fiber paper as claimed in claim 4, it is characterized in that, described inlet pipeline (4) is provided with electromagnetic flowmeter (7) and electromagnetic valve (8).
6. the preparation method of meta-position aramid fiber paper as claimed in claim 1, it is characterized in that, in described step 2, before entering hydraulic jet dispersal device, the moisture content of aramid fiber fibrid is 80% ~ 90%, hydraulic jet dispersal device open before, by aramid fiber fibrid with 8% concentration in hopper, soak 0.5 ~ 2h, the pulp concentration of described hydraulic jet dispersal device is 0.8% ~ 3%, intake pressure is 500 ~ 3000Pa, and nozzle diameter is 0.3 ~ 1mm.
7. the preparation method of meta-position aramid fiber paper as claimed in claim 1, it is characterized in that, the hydrabrusher in described step 3 is vertical pulper, and described vertical pulper comprises shell, be provided with rotor in shell, described rotor and model are that the structure of the rotor of the agitator of HR2004 is identical.
8. the preparation method of meta-position aramid fiber paper as claimed in claim 7, it is characterized in that, described shell inner top is provided with spray equipment, described spray equipment comprises four jet pipes, five equidistant nozzles every root jet pipe are equipped with, the injection direction of described nozzle and the angle α of vertical direction are 45-60 °, are close to pulper sidewall.
9. the preparation method of meta-position aramid fiber paper as claimed in claim 1, it is characterized in that, the rotating speed of described hydrabrusher is 10000 ~ 20000 revs/min, and the time of discongesting is 1 ~ 5min.
10. the preparation method of meta-position aramid fiber paper as claimed in claim 7, it is characterized in that, the centrifugal speed of described centrifugal sereen is 500 ~ 2000 revs/min, and screen cloth is wherein 10 ~ 100 object polyester screen.
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| CN114717678A (en) * | 2022-04-06 | 2022-07-08 | 赣州龙邦材料科技有限公司 | Preparation method of spiral ribbon aramid fibrid for papermaking |
| CN114717678B (en) * | 2022-04-06 | 2024-02-27 | 赣州龙邦材料科技有限公司 | Preparation method of ribbon aramid fibrid for papermaking |
| CN115207559A (en) * | 2022-06-28 | 2022-10-18 | 陈克复 | High-performance aramid fiber diaphragm and preparation method and application thereof |
| CN115207559B (en) * | 2022-06-28 | 2024-03-22 | 陈克复 | High-performance aramid fiber diaphragm and preparation method and application thereof |
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