CN109457533A - A kind of preparation method regenerating aramid fiber extrusion coating paper - Google Patents
A kind of preparation method regenerating aramid fiber extrusion coating paper Download PDFInfo
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- CN109457533A CN109457533A CN201811179782.4A CN201811179782A CN109457533A CN 109457533 A CN109457533 A CN 109457533A CN 201811179782 A CN201811179782 A CN 201811179782A CN 109457533 A CN109457533 A CN 109457533A
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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
- 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
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/023—Cleaning wood chips or other raw materials
-
- 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
-
- 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
- D21H15/10—Composite 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
- D21H17/55—Polyamides; Polyaminoamides; Polyester-amides
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention discloses a kind of preparation methods for regenerating aramid fiber extrusion coating paper.Mixing discongests to form uniform fiber/water suspension after the preparation method is first pre-processed p-aramid fiber chopped strand, para-aramid pulp fiber and meta-aramid pulp fibers, and Composite aramid fiber body paper is made in dehydration forming after paper making additive is added into suspension；Aramid fiber solution is obtained with organic solvent/inorganic salts salt solution meta-aramid fibers, aramid fiber solution obtained is dropped in aramid fiber composite base paper structure, it places it in air and regenerates again, paper is subjected to high temperature and pressure hot pressing after to be regenerated and obtains high-intensitive aramid fiber extrusion coating paper after the organic solvent and inorganic salts for removing remnants is washed with water.The quantification of 20-200g/m of high intensity aramid fiber extrusion coating paper of the invention2, with a thickness of 10-300 μm, mechanical strength is greatly improved, and tensile strength improves 20 times.
Description
Technical field
The present invention relates to a kind of manufacturing methods of high-intensitive aramid paper, more specifically more particularly to a kind of fragrant with meta position
Synthetic fibre solution enhances common aramid fiber extrusion coating paper to increase substantially the novel method of its mechanical property, and the high intensity aramid fiber is compound
Paper can be applied to the fields such as military affairs, board substrate, traffic, building, packaging, electrical.
Background technique
Aramid fiber with good insulation preformance, high temperature resistant, flame retardant property is good, be able to bear strong corrosion and have good mechanical properties
The advantages that.In recent years, aramid paper is as a kind of novel high-performance special material, in insulating materials, building trade, traffic fortune
The important application in the fields such as defeated, military project substrate gradually expands.
The aramid paper industry in current China obtains as development faster, achieves some more good achievements.Mesh
Before, aramid fiber paper is mainly formed by chopped strand, pulp fibers and fibrid mixed copy, and most domestic enterprise is still in lab scale
Cause the performance of product special due to the biggish draw ratio of surface inertness and chopped strand of aramid fiber with the pilot scale stage
Be physical property is poor, such as mechanical strength is lower, formation of sheet is poor, with the technical level still gaps of developed countries very
Greatly, which greatly limits the applications of aramid fiber extrusion coating paper.
At this stage, the technical aspect of the domestic high-performance aramid fiber extrusion coating paper in preparation superelevation mechanical strength is still scarce
It loses, remains at during effort explores, and most of research focuses on and how to carry out surface hydrophilic to aramid fiber and change
Property, how to be prepared evenness and the preferable aramid paper of apparent property and how to being enhanced this kind of research phases again at paper
To less.Chinese invention patent 2016106024865 discloses a kind of preparation method of high-performance Powerleader synthetic fibre aramid fiber extrusion coating paper,
Specifically includes the following steps: being pre-processed to POD chopped strand；By POD chopped strand fluffer after pretreatment into
Row is discongested for the first time；Then meta-aramid pulp fibers are added, secondary discongest is carried out；It finally adds dispersing agent, carries out the
It discongests three times, obtains suspension；Obtained suspension is injected in sheet forming apparatus and carries out dehydration forming, squeezed, be dried
Aramid fiber extrusion coating paper body paper is obtained afterwards；The progress of resulting aramid fiber extrusion coating paper body paper is hot-forming, obtain high performance aramid fiber extrusion coating paper.It should
Technology can maximally utilise the high strength characteristics of chopped strand, improve the strength character of meta-position aramid fiber paper.However due to POD
Chopped strand and the poor surface-active of meta-aramid pulp fibers are difficult at paper process so that POD is chopped only by wet process
Higher binding force is formed between fiber and meta-aramid pulp fibers.After through high temperature and pressure hot pressing, meta-aramid pulp
The melting of fiber and POD chopped strand is limited, is difficult to form good dissolution coating function between the two.In addition, POD fiber
Addition have certain negative effect to the dielectric properties of paper.
Chinese invention patent 2016100280815 discloses a kind of preparation method of high smoothing insulator meta-position aramid fiber paper,
By the way that meta-aramid fibre fibrid is filtered out 100 purpose of fiber length distribution >=100 mesh slurry A and fiber length distribution <
Slurry B；Slurry A and thick meta-aramid chopped strand are sufficiently mixed dispersion, is formed and manufactures paper with pulp to obtain sandwich layer wet web；It will
Slurry B and ultra-fine meta-aramid chopped strand are sufficiently mixed dispersion, are formed and manufacture paper with pulp to obtain surface layer wet web and bottom l Water Paper
Width；Sequence according to surface layer, sandwich layer and bottom wet web is compound from top to bottom, then squeezes, obtains aramid fiber body paper after drying, then
Infiltration processing is carried out, the aramid fiber body paper after infiltration is hot-forming, high smoothing insulator meta-position aramid fiber paper is made.The present invention is made
Aramid paper surface smoothness it is high, overcome and be easy to the problem of fluffing, while guaranteeing its excellent mechanical strength, improve
The dielectric properties of aramid paper, while significantly reducing the energy consumption of hot pressing.Although this method improves to a certain extent
Surface strength and the higher meta-position aramid fiber paper of smoothness has been made in the evenness of paper, but meeting can not during layering is manufactured paper with pulp
The problem of the appearance interfacial bonding strength difference avoided, it is limited to the integral strength raising of paper, and preparation process needs to screen fibre
Dimension, process are complex, it is difficult to realize industrialization.
Summary of the invention
It is a primary object of the present invention to overcome the physical property difference of aramid paper in the prior art and insulation performance two low
The problem of aspect, provides a kind of preparation method of good, good insulation preformance the high-performance aramid fiber extrusion coating paper of physical property, has good
Good commercial scale basis.
The present invention first by the p-aramid fiber chopped strand of micron level, para-aramid pulp, meta-aramid pulp mixed copy at
Aramid fiber extrusion coating paper.Highly polar organic solvent/inorganic salts/meta position that a certain amount of concentration is 2%-30% is added dropwise into paper structure again
Aramid fiber solution.Since the highly polar organic solvent containing inorganic salts can dissolve the meta-aramid pulp fibers in paper, work as virtue
After synthetic fibre solution is added dropwise on aramid fiber extrusion coating paper, local dissolution can also occur for meta-aramid pulp fibers, and paper is placed on air
In, make to be started again in the aramid fiber and paper structure that are dissolved in aramid fiber solution by the meta-aramid pulp fibers of local dissolution
It is raw.It is washed, organic solvent contained in paper and inorganic salts is washed out, then handle through vulcanizing press with clear water after regeneration
Entire paper structure can be made even closer, tight.After aramid fiber solution enters in paper structure regeneration filling paper structure and
On the one hand aramid fiber local dissolution self-reinforcing significantly enhances the physical property of this aramid fiber extrusion coating paper, on the other hand right
There has also been sizable improvement for the insulation performance of paper.
The object of the invention is achieved through the following technical solutions:
A kind of preparation method regenerating aramid fiber extrusion coating paper includes the following steps and process conditions:
1) outfit of pretreatment fluid: configuration surface activator solution or organic solvent solution obtain pretreatment fluid, standby
With；
2) p-aramid fiber chopped strand pre-processes: there are remaining when spinning to surface for the pretreatment fluid provisioned in step 1)
The p-aramid fiber chopped strand of impurity is pre-processed；Pretreating process is the pretreatment fluid processing fiber with covering fibre weight
10-120min, carries out collaboration processing with ultrasonic wave when processing, and ultrasonic power 50-100w stirred one every 10-20 minutes
Secondary, pretreated temperature is 25-80 DEG C, and aramid short fiber is cleaned drying after having handled, and obtains pretreated contraposition virtue
Synthetic fibre chopped strand；
3) fiber surface modification: by step 2) pretreated p-aramid fiber chopped strand obtained, and contraposition virtue
At least one of synthetic fibre pulp fibers and meta-aramid pulp fibers one reinstate coupling agent and carry out graft modification processing, coupling agent load
Amount is calculated as 10-190ml/g by aramid fiber oven-dry weight, and treatment temperature is 25-70 DEG C, and the processing time is 30-240min；It is described
Coupling agent is one of KH-550, KH-560, KH-570, titanate coupling agent and KH-792 or a variety of；
4) paper making technique: will be fine through step 3) treated p-aramid fiber chopped strand and para-aramid pulp
Dimension and/or meta-aramid pulp fibers all wash with distilled water, remove remaining coupling agent；Then gained fiber is evenly dispersed
In water and paper making additive is added；With automatic paper machine at paper；
5) paper is dry: will obtain the compound original of aramid fiber after aramid paper made from step 4) is dry under elevated temperature in vacuo
Paper；
6) prepared by aramid fiber solution: meta-aramid fibers being dissolved in the highly polar organic solvent solution dissolved with inorganic salts and are obtained
To aramid fiber solution, solution temperature is 25-100 DEG C；
7) the compound original of the aramid fiber made from step 5) regeneration of aramid fiber extrusion coating paper: is added dropwise in aramid fiber solution made from step 6)
It on paper, is placed in air, dissolved meta-aramid fibers is made to be regenerated to obtain the regeneration compound original of aramid fiber in paper structure
Paper；The amount of the aramid fiber solution is the 100%-300% of paper bone dry fiber quality；
8) heat pressing process: the regeneration aramid fiber composite base paper that step 7) is obtained carries out high temperature and pressure hot-pressing processing；
9) washing process: with clear water washing step 8) obtained paper and regeneration aramid fiber extrusion coating paper is obtained after drying.
To further realize the object of the invention, it is preferable that surfactant described in step 1) is detergent alkylate sulphur
One of sour sodium, polyacrylamide, stearic acid, fatty glyceride are a variety of, and the mass fraction of surfactant solution is
1-10%, the organic solvent are one of ethyl alcohol, acetone, isopropanol or a variety of, the mass fraction of organic solvent solution
For 30-70%.
Preferably, in the pretreating process of step 2), the dosage of pretreatment fluid covers aramid fiber, in treatment process every
5-30min stirring is primary.
Preferably, the coupling agent -ol solution that coupling agent described in step 3) is pure coupling agent or mass ratio is 1:1.0-5.0
Mass ratio be 1:1.0-5.0 coupling agent-aqueous solution or mass ratio be 1:1.5-4.5:0.5-1.5 coupling agent -ol-it is water-soluble
Liquid.
Preferably, the length of aramid short fiber described in step 4) and ppta-pulp fibre is 3-8mm, with quality percentage
Than meter, the accounting of p-aramid fiber chopped strand is 20%-60%, the accounting of para-aramid pulp fiber is 0%-60%, meta position
The accounting of ppta-pulp fibre is 0%-80%, and the quantification of 20-200g/m of paper is prepared2。
Preferably, described in step 4) by gained fiber it is evenly dispersed be to be in water in revolving speed with waterpower fluffer
It is discongested under 20000-3000rpm；The dispersing agent includes that cationic polyacrylamide, anionic polyacrylamide, nonionic are poly-
One of acrylamide, polyethylene glycol oxide, neopelex, lauryl sodium sulfate and hydroxyethyl cellulose are more
Kind, the dispersing agent additional amount is the 0.1-1.0% of bone dry fiber quality used；The retention and drainage aid agent includes that cation forms sediment
Powder, diallyl dimethyl ammoniumchloride, polyvinyl alcohol, cationic polyacrylamide, anionic polyacrylamide and nonionic
One of polyacrylamide is a variety of, and the retention and drainage aid agent additional amount is the 0.5-5.0% of bone dry fiber quality used.
Preferably, in step 5), temperature when vacuum drying is 50 DEG C -110 DEG C.
Preferably, in step 6), the organic solvent is one of DMSO, DMF, DMAC and NMP or a variety of, described
Inorganic salts are LiCl2、CaCl2、MgCl2One of or it is a variety of, the concentration of the aramid fiber solution being prepared is 2%-30%.
Preferably, in step 7), the quality of the aramid fiber solution of dropwise addition is the 100%-300% of paper bone dry fiber quality.
Preferably, the hot pressing temperature of step 8) the high temperature and pressure hot pressing is 100-300 DEG C, pressure 5-15MPa, the time
For 2-20min.
The present invention first carries out depth washing to the surface of p-aramid fiber chopped strand, cleans the impurity of its surface residual, has
Conducive to coupling agent graft reaction to p-aramid fiber chopped strand surface introduce active group, and then increase fiber it is hydrophilic
Performance improves paper properties.After at paper, by the way that a certain amount of aramid fiber solution, aramid fiber are added dropwise in aramid fiber composite base paper structure
Solution can perfectly fill the hole in paper structure after regenerating in paper structure, meanwhile, aramid fiber solution is to paper Central Plains
Originally regeneration can be better after the meta-aramid pulp fibers contained have local dissolution effect, meta-aramid pulp fibers to be dissolved
It coats p-aramid fiber chopped strand, then regenerated fiber and p-aramid fiber chopped strand and right is realized by high temperature and pressure hot pressing function
Welding certainly for position ppta-pulp fibre, has filled up pore structure with p-aramid fiber chopped strand and has formed similar armored concrete knot
Structure makes paper structure compact, finally obtains the aramid fiber extrusion coating paper of superhigh intensity.
Compared with the prior art, the invention has the following advantages:
(1) have the characteristics that simple process, excellent product performance, low in cost industrialize.
(2) dielectric properties of aramid fiber extrusion coating paper have been improved.
(3) the compact-sized densification of aramid fiber extrusion coating paper made from, aramid paper obtained improves 20- to intensity compared with prior art
25 times.
(4) the dissolution self-reinforcing of meta-aramid pulp fibers is not only utilized and be utilized aramid fiber solution regeneration it is completeer
Beauty has filled up the defects of paper structure.
(5) technology has carried out efficient modification to the inactive surfaces of aramid fiber, has introduced carboxyl, hydroxyl in fiber surface
Base, amino isoreactivity group, are conducive to the evenness of paper.
Detailed description of the invention
Fig. 1 is the stereoscan photograph figure of aramid fiber composite base paper in embodiment 1.
Fig. 2 is in embodiment 1 by enhanced aramid fiber extrusion coating paper stereoscan photograph figure.
Fig. 3 is the stereoscan photograph figure of aramid fiber composite base paper in embodiment 3.
Fig. 4 is in embodiment 3 by enhanced aramid fiber extrusion coating paper stereoscan photograph figure.
Fig. 5 is the stereoscan photograph figure of aramid fiber composite base paper in embodiment 4.
Fig. 6 is in embodiment 4 by enhanced aramid fiber extrusion coating paper stereoscan photograph figure.
Specific embodiment
In order to more deeply understand the present invention, the present invention is further illustrated in conjunction with the embodiments in face, needs to illustrate
It is that the scope of protection of present invention is not limited to the scope of the embodiments.
In following example, dielectric properties test is used: GB/T1408.1-2006 standard testing.Tensile strength uses QB/
T 1670-92 standard testing.
Embodiment 1
A kind of preparation method regenerating aramid fiber extrusion coating paper, includes the following steps:
(1) outfit of pretreatment fluid: detergent alkylate naphthenic acid sodium is dissolved in the water be diluted to mass fraction be 5% it is molten
Liquid obtains pretreatment fluid, spare；
(2) fiber pre-processes: under the conditions of pretreatment fluid provisioned in step (1) to be maintained to 50-60 DEG C of temperature, to right
Position aramid short fiber is pre-processed, and pretreating process is at the neopelex solution for just covering fibre weight
Fiber 40min is managed, carries out collaboration processing with ultrasonic wave when processing, ultrasonic power 50w is primary every stirring in 10 minutes, place
Aramid short fiber is cleaned into drying after having managed and obtains pretreated aramid short fiber；
(3) fiber surface modification: by step (2) pretreated p-aramid fiber chopped strand obtained, and without place
The para-aramid pulp fiber one of reason reinstates coupling agent and is modified processing, and coupling agent is configured to coupling agent: water: ethyl alcohol quality
Than the solution for 3:2:18, coupling agent dosage is 30ml/g by over dry aramid fiber quality, constant temperature under the conditions of 40 DEG C of temperature,
The processing time is 180min, and the coupling agent is KH-550, and aramid fiber is cleaned and is dried to constant weight with clear water after having handled
Obtain the aramid fiber being modified；
(4) paper making technique: the modification of p-aramid fiber chopped strand and 60 mass parts that 40 mass parts have been modified is well
Para-aramid pulp fiber mix and discongest 80000r in the case where revolving speed is 2500rpm with waterpower fluffer, be scattered in water
Simultaneously paper making additive is added in middle formation fiber dispersion, the paper making additive be non-ionic polyacrylamide and cationic starch, it is non-
Cationic polyacrylamide additional amount is the 0.5% of bone dry fiber quality used, and cationic starch dosage is bone dry fiber matter used
The 1.0% of amount, the quantification of 40g/m of aramid fiber composite base paper to be manufactured paper with pulp with automatic paper machine dehydration forming, the present embodiment2。
(5) paper is dry: the aramid paper made from step (4) flies to the compound original of aramid fiber after drying under vacuum conditions
Paper, drying temperature are 95 DEG C；
(6) aramid fiber solution prepare: by the meta-aramid fibers of 1 mass parts be dissolved in 50 mass parts dissolved with 0.8 mass parts without
Obtaining meta-aramid solution in the highly polar organic solvent solution of machine salt, highly polar organic solvent is DMAC, inorganic salts LiCl,
Solution temperature is 90 DEG C；
(7) the meta-aramid solution on aramid fiber composite base paper the regeneration of aramid fiber composite base paper: is added dropwise in meta-aramid solution
Dripping quantity be 3 times of aramid fiber composite base paper bone dry fiber quality, the aramid fiber extrusion coating paper that meta-aramid solution is added dropwise is placed in sky
It in gas, regenerates aramid fiber solution in the paper structure that pure para-aramid fiber is constituted, obtains regeneration aramid fiber composite base paper；
(8) it is remaining in paper to remove that the regeneration aramid fiber composite base paper obtained through step (7) heat pressing process: is washed with clear water
Organic solvent and inorganic salts, paper it is dry after carries out hot-pressing processing with vulcanizing press again, hot pressing temperature is 225 DEG C, is pressed
Power is 9MPa, hot pressing time 5min, finally obtains the regeneration aramid fiber extrusion coating paper of fiber combination closely.
Aramid fiber composite base paper made from the present embodiment regeneration aramid fiber extrusion coating paper obtained and the present embodiment step (5) compares,
With a thickness of 78 μm, tensile strength increases to 79.72MPa by 3.85MPa, nearly 20 times is increased, by breakdown voltage tester
On according to standard test its dielectric constant (tested media be air, rate of pressure rise 0.5Kv/ seconds, Time constant 30 seconds),
Dielectric strength is 32KV/mm, more than product dielectric properties obtained by method disclosed in Chinese invention patent 2016100280815
It is good.
Test result shows that the regeneration aramid fiber extrusion coating paper of the present embodiment manufacture is compared in terms of strength character and dielectric strength
Common insulation aramid paper or aramid nonwoven have obviously advantage.The present embodiment regenerates aramid fiber extrusion coating paper paper and increases in regeneration
The stereoscan photograph difference of strong front and back is as depicted in figs. 1 and 2: it will be seen from figure 1 that aramid fiber composite base paper short texture, right
Position aramid short fiber and meta-aramid pulp fibers between combination it is more loose, in paper structure there are many holes and lack
It falls into, reviews Fig. 2, aramid fiber composite base paper is after regeneration enhancing, and the meta-aramid perfection after chopped strand is reproduced coats, paper
In hole and defect be filled, p-aramid fiber chopped strand supports the skeleton of paper, forms similar reinforced concrete
The structure of soil.
Embodiment 2
A kind of preparation method regenerating aramid fiber extrusion coating paper, includes the following steps:
(1) outfit of pretreatment fluid: acetone solution Yu Shuizhong is diluted to the solution that mass fraction is 40%, must be pre-processed
Liquid, it is spare；
(2) fiber pre-processes: under the conditions of pretreatment fluid provisioned in step (1) to be maintained to 40 DEG C of temperature, to contraposition
Aramid short fiber is pre-processed, and pretreating process is with the acetone soln processing fiber 50min for just covering fibre weight, place
It needs to carry out collaboration processing with ultrasonic wave when reason, ultrasonic power 50w is primary every needs stirring in 10 minutes, after having handled
Aramid short fiber is cleaned into drying and obtains pretreated aramid short fiber；
(3) fiber surface modification: by step (2) pretreated aramid short fiber obtained and untreated
Para-aramid pulp fiber and meta-aramid pulp fibers are modified processing with coupling agent, and coupling agent is configured to mass ratio
For coupling agent: water: ethyl alcohol is the solution of 3:1.8:15, and coupling agent dosage is 40ml/g by over dry aramid fiber quality, and constant temperature exists
Under the conditions of 50 DEG C of temperature, the processing time is 120min, and the coupling agent is KH-560, and aramid fiber is washed with clear water after having handled
Net and drying to constant weight obtains the aramid fiber being modified；
(4) paper making technique: the modification of p-aramid fiber chopped strand, 20 mass parts that 35 mass parts have been modified is good
The meta-aramid pulp fibers that para-aramid pulp fiber and 45 mass parts have been modified mix and with waterpower fluffers
60000r is discongested under conditions of 2500rpm to be dispersed in water to form fiber dispersion and paper making additive, the papermaking is added
Auxiliary agent is polyethylene glycol oxide and poly dimethyl allyl alkyl dimethyl ammonium chloride, and wherein the dosage of polyethylene glycol oxide is over dry used
The 0.5% of fibre weight, the dosage of polydimethyl diallyl ammonium chloride is the 2% of bone dry fiber dosage, with automatic paper machine
Dehydration forming, the quantification of 50g/m of aramid fiber composite base paper that the present embodiment is manufactured paper with pulp2。
(5) paper is dry: the aramid paper made from step (4) flies to the compound original of aramid fiber after drying under vacuum conditions
Paper, drying temperature are 95 DEG C；
(6) prepared by aramid fiber solution: it is inorganic dissolved with 1 mass parts that the meta-aramid fibers of 2 mass parts being dissolved in 50 mass parts
Aramid fiber solution is obtained in the highly polar organic solvent solution of salt, highly polar organic solvent described in the present embodiment is DMSO, institute
Category inorganic salts are LiCl, and solution temperature is 80 DEG C；
(7) dripping quantity of aramid fiber solution on aramid fiber composite base paper the regeneration of aramid fiber composite base paper: is added dropwise in aramid fiber solution
It is 1.8 times of aramid fiber composite base paper bone dry fiber quality, the aramid fiber extrusion coating paper that aramid fiber solution is added dropwise is placed in air, aramid fiber is made
By the meta-aramid pulp fibers of local dissolution in paper knot in the meta-aramid fibers and paper structure being dissolved in solution
It is regenerated to obtain regeneration aramid fiber composite base paper in structure；
(8) it is remaining in paper to remove that the regeneration aramid fiber composite base paper obtained through step (7) heat pressing process: is washed with clear water
Organic solvent and inorganic salts, paper it is dry after carries out hot-pressing processing with vulcanizing press again, hot pressing temperature is 190 DEG C, is pressed
Power is 6MPa, hot pressing time 7min, finally obtains the regeneration aramid fiber extrusion coating paper of fiber combination closely.
With a thickness of 96 μm, tensile strength is made the present embodiment regeneration aramid fiber extrusion coating paper obtained by the present embodiment step (5)
The 3.95MPa of non-reinforced aramid fiber composite base paper increase to 82.72MPa, increase nearly 20 times, dielectric strength 31KV/mm.
The above results show that the regeneration aramid fiber extrusion coating paper of the present embodiment manufacture compares common insulation in terms of strength character and dielectric strength
Aramid paper or aramid nonwoven have obviously advantage
Embodiment 3
A kind of preparation method regenerating aramid fiber extrusion coating paper, includes the following steps:
(1) outfit of pretreatment fluid: fatty glyceride being dissolved in the water and is diluted to the solution that mass fraction is 3%,
Pretreatment fluid is obtained, it is spare；
(2) fiber pre-processes: right under the conditions of pretreatment fluid provisioned in step (1) to be maintained to 45 DEG C or so of temperature
P-aramid fiber chopped strand is pre-processed, and pretreating process is with the fatty acid glycerine ester solution processing for just covering fibre weight
Fiber 60min, when processing, need to carry out collaboration processing with ultrasonic wave, and ultrasonic power 50w needed to stir one every 15 minutes
It is secondary, aramid short fiber is cleaned into drying after having handled and obtains pretreated aramid short fiber；
(3) fiber surface modification: by step (2) pretreated aramid short fiber obtained and untreated
Meta-aramid pulp fibers are modified processing with coupling agent, and it is coupling agent: water: ethyl alcohol 3 that coupling agent, which is configured to mass ratio:
The solution of 2:15, coupling agent dosage are 50ml/g by over dry aramid fiber quality, and constant temperature handles the time under the conditions of 50 DEG C of temperature
For 120min, the coupling agent is Silane coupling agent KH550, and aramid fiber is cleaned and is dried to constant weight with clear water after having handled
Obtain the aramid fiber being modified；
(4) paper making technique: p-aramid fiber chopped strand that 40 mass parts have been modified and 60 mass parts have been modified
Meta-aramid pulp fibers, which mix and discongest 75000r under conditions of revolving speed is 2500rpm with waterpower fluffer, to be scattered in
Fiber dispersion is formed in water and paper making additive is added, and auxiliary agent loading capacity is the 2.5% of bone dry fiber quality, the paper making additive
For hydroxyethyl cellulose and cationic starch, wherein the additional amount of hydroxyethyl cellulose is the 0.8% of bone dry fiber quality used,
Cationic starch dosage is the 1.7% of bone dry fiber quality used, and with automatic paper machine dehydration forming, the present embodiment manufactures paper with pulp to obtain
The quantification of 30g/m of aramid fiber composite base paper2。
(5) paper is dry: the aramid paper made from step (4) flies to the compound original of aramid fiber after drying under vacuum conditions
Paper, drying temperature are 95 DEG C；
(6) prepared by aramid fiber solution: it is inorganic dissolved with 1 mass parts that the meta-aramid fibers of 2 mass parts being dissolved in 50 mass parts
Aramid fiber solution is obtained in the highly polar organic solvent solution of salt, highly polar organic solvent described in the present embodiment is NMP, affiliated
Inorganic salts are LiCl, and solution temperature is 60 DEG C；
(7) the dropwise addition matter of aramid fiber solution on aramid fiber composite base paper the regeneration of aramid fiber composite base paper: is added dropwise in aramid fiber solution
Amount is 1.5 times of aramid fiber composite base paper bone dry fiber quality, and the aramid fiber extrusion coating paper that aramid fiber solution is added dropwise is placed in air, virtue is made
By the meta-aramid pulp fibers of local dissolution in paper in the meta-aramid fibers and paper structure being dissolved in synthetic fibre solution
It is regenerated to obtain regeneration aramid fiber composite base paper in structure；
(8) it is remaining in paper to remove that the regeneration aramid fiber composite base paper obtained through step (7) heat pressing process: is washed with clear water
Organic solvent and inorganic salts, paper it is dry after carries out hot-pressing processing with vulcanizing press again, hot pressing temperature is 180 DEG C, is pressed
Power is 7MPa, hot pressing time 10min, finally obtains the regeneration aramid fiber extrusion coating paper of fiber combination closely.
The present embodiment regeneration aramid fiber extrusion coating paper obtained and common aramid paper compare, and with a thickness of 75 μm, regeneration aramid fiber is compound
Stereoscan photograph difference of the paper paper before and after regeneration enhancing is as shown in Figure 3 and Figure 4, from figure 3, it can be seen that due to this implementation
The all meta-aramid pulp fibers of ppta-pulp fibre used by example, after high temperature and pressure hot pressing, meta-aramid is starched
Dregs of rice fiber produces a degree of micro dissolution and recrystallization, thus its to the package of p-aramid fiber chopped strand also compared with
Good, paper has compared consolidation, but still can see the presence of part hole, aramid fiber solution be added dropwise in paper structure into
After row regeneration enhancing, Fig. 4 can see the hole in paper structure and completely disappear, and paper structure seems more smooth, virtue
Synthetic fibre chopped strand is more perfectly wrapped up and is covered, interfibrous binding force enhancing.This enhancing phenomenon is to paper
Mechanical strength and dielectric strength are unquestionably advantageous, and by actual test, tensile strength is made by the present embodiment step (5)
The 9.88MPa of non-reinforced aramid fiber composite base paper increase to 82.53MPa, increase nearly 8 times, dielectric strength 33KV/
Mm has been over the performance of E.I.Du Pont Company's similar product.Paper made from the present embodiment can be used as paper base and be applied in height
In frequency high speed substrate, high-frequency high-speed communication is realized, it can also be used to which low-density needed for manufacturing train, automobile, aircraft, ship etc. is high
Strength materials.
Embodiment 4
A kind of preparation method regenerating aramid fiber extrusion coating paper, includes the following steps:
(1) outfit of pretreatment fluid: fatty acid is dissolved in the water and is diluted to the solution that mass fraction is 5%, obtains pre- place
Liquid is managed, it is spare；
(2) fiber pre-processes: under the conditions of pretreatment fluid provisioned in step (1) to be maintained to 40-50 DEG C of temperature, to right
Position aramid short fiber is pre-processed, and pretreating process is with the adipic acid solution processing fiber for just covering fibre weight
55min, when processing, need to carry out collaboration processing with ultrasonic wave, and ultrasonic power 50w is primary every needs stirring in 10 minutes,
Aramid short fiber is cleaned into drying after having handled and obtains pretreated aramid short fiber；
(3) fiber surface modification: by step (2) pretreated p-aramid fiber chopped strand obtained, and without place
The para-aramid pulp fiber and meta-aramid pulp fibers of reason are modified processing with coupling agent, and coupling agent is configured to matter
Measuring ratio is coupling agent: water: ethyl alcohol is the solution of 3:2:16, and coupling agent dosage is 40ml/g, constant temperature by over dry aramid fiber quality
Under the conditions of 45 DEG C of temperature, the processing time is 120min, and the coupling agent is silane coupling agent KH560, uses clear water after having handled
Aramid fiber is cleaned and dried to constant weight and obtains the aramid fiber being modified；
(4) paper making technique: pair that p-aramid fiber chopped strand that 35 mass parts have been modified, 20 mass parts have been modified
The meta-aramid pulp fibers that position 45 mass parts of ppta-pulp fibre have been modified mix and are in revolving speed with waterpower fluffer
30000r is discongested under conditions of 2500rpm to be dispersed in water to form fiber dispersion and paper making additive, auxiliary agent load is added
Amount is the 2.5% of bone dry fiber quality, and the paper making additive is polyethylene glycol oxide and polyvinyl alcohol, wherein polyethylene glycol oxide
Additional amount is the 0.5% of bone dry fiber quality used, and polyvinyl alcohol dosage is the 2.0% of bone dry fiber quality used, with automatic
Paper machine dehydration forming, the quantification of 30g/m of aramid fiber composite base paper that the present embodiment is manufactured paper with pulp2。
(5) paper is dry: the aramid paper made from step (4) obtains the compound original of aramid fiber after drying under vacuum conditions
Paper, drying temperature are 95 DEG C；
(6) prepared by aramid fiber solution: it is inorganic dissolved with 1 mass parts that the meta-aramid fibers of 2 mass parts being dissolved in 50 mass parts
Meta-aramid fibers solution is obtained in the highly polar organic solvent solution of salt, highly polar organic solvent described in the present embodiment is
DMAC, affiliated inorganic salts are LiCl, and solution temperature is 70 DEG C；
(7) drop of aramid fiber solution on aramid fiber composite base paper the regeneration of aramid fiber composite base paper: is added dropwise in meta-aramid solution
Adding quality is 1.6 times of aramid fiber composite base paper bone dry fiber quality, and the aramid fiber extrusion coating paper that aramid fiber solution is added dropwise is placed in air,
Make the meta-aramid fibers being dissolved in aramid fiber solution and is existed in paper structure by the meta-aramid pulp fibers of local dissolution
It is regenerated to obtain regeneration aramid fiber composite base paper in paper structure；
(8) it is remaining in paper to remove that the regeneration aramid fiber composite base paper obtained through step (7) heat pressing process: is washed with clear water
Organic solvent and inorganic salts, paper it is dry after carries out hot-pressing processing with vulcanizing press again, hot pressing temperature is 180 DEG C, is pressed
Power is 10MPa, hot pressing time 8min, finally obtains the regeneration aramid fiber extrusion coating paper of fiber combination closely.
The compound original of aramid fiber not reinforced made from the present embodiment regeneration aramid fiber extrusion coating paper obtained and the present embodiment step (5)
Paper comparison, with a thickness of 75 μm, stereoscan photograph of the regeneration aramid fiber extrusion coating paper paper before and after regeneration enhancing is respectively such as Fig. 5 and figure
Shown in 6, there is fluffing in comparison diagram 5 and Fig. 6, aramid fiber composite base paper paper surface before enhancing without the regeneration of meta-aramid solution
Phenomenon has aramid short fiber to be free in except paper structure, this is because pulp fibers are to the intertexture between chopped strand
Caused by winding power is poor, fiber does not form sufficiently strong Hydrogenbond each other, reviews and regenerates increasing by aramid fiber solution
Strong aramid paper, paper structure is very gauged smooth, in the not exposed fiber in surface, this is because dissolution is in the solution
Aramid fiber molecule recrystallized, p-aramid fiber chopped strand and contraposition are perfectly being wrapped up after high temperature and pressure hot pressing
Ppta-pulp fibre.By actual test, the tensile strength for regenerating aramid fiber extrusion coating paper paper is not reinforced as made from the present embodiment
The 5.41MPa of aramid fiber composite base paper increase to 89.66MPa, increase 16 times, dielectric strength 32KV/mm.It alreadys exceed
The performance of E.I.Du Pont Company's similar product.Paper made from the present embodiment can be used as paper base and be applied in high-frequency high-speed substrate
In, realize high-frequency high-speed communication, it can also be used to low-density and high-strength material needed for manufacturing train, automobile, aircraft, ship etc..
Embodiment 5
A kind of preparation method regenerating aramid fiber extrusion coating paper, includes the following steps:
(1) outfit of pretreatment fluid: polyacrylamide is dissolved in the water and is diluted to the solution that mass fraction is 3%, is obtained
Pretreatment fluid, it is spare；
(2) fiber pre-processes: under the conditions of pretreatment fluid provisioned in step (1) to be maintained to 70 DEG C of temperature, to aramid fiber
Chopped strand is pre-processed, and pretreating process is to handle fiber 60min with the polyacrylamide solution for just covering fibre weight,
It needs to carry out collaboration processing with ultrasonic wave when processing, ultrasonic power 50w is primary every needs stirring in 10 minutes, has handled
Aramid short fiber is cleaned into drying afterwards and obtains pretreated aramid short fiber；
(3) fiber surface modification: by step (2) pretreated aramid short fiber obtained and untreated
Para-aramid pulp fiber and meta-aramid pulp fibers are modified processing with coupling agent, and coupling agent is configured to mass ratio
For coupling agent: water: ethyl alcohol is the solution of 2:1:18, and coupling agent dosage is 60ml/g by over dry aramid fiber quality, and constant temperature is 45
Under the conditions of DEG C temperature, the processing time is 160min, and the coupling agent is KH-570, and aramid fiber is cleaned with clear water after having handled
And drying to constant weight obtains the aramid fiber being modified；
(4) paper making technique: the modification of p-aramid fiber chopped strand and 20 mass parts that 40 mass parts have been modified is well
Para-aramid pulp fiber and the meta-aramid pulp fibers that have been modified of 40 mass parts mix and use waterpower fluffer in revolving speed
It is dispersed in water to discongest 50000r under conditions of 2500rpm to form fiber dispersion and paper making additive is added, auxiliary agent adds
Carrying capacity is the 3.5% of bone dry fiber quality, and the paper making additive is non-ionic polyacrylamide and hydroxyethyl cellulose, wherein non-
The additional amount of cationic polyacrylamide is the 1.0% of bone dry fiber quality used, and hydroxyethyl cellulose dosage is that over dry used is fine
Tie up the 2.5% of quality, the quantification of 40g/ of aramid fiber composite base paper to be manufactured paper with pulp with automatic paper machine dehydration forming, the present embodiment
m2。
(5) paper is dry: the aramid paper made from step (4) flies to the compound original of aramid fiber after drying under vacuum conditions
Paper, drying temperature are 95 DEG C；
(6) prepared by aramid fiber solution: it is inorganic dissolved with 1 mass parts that the meta-aramid fibers of 1 mass parts being dissolved in 50 mass parts
Meta-aramid fibers solution is obtained in the highly polar organic solvent solution of salt, highly polar organic solvent described in the present embodiment is NMP,
Affiliated inorganic salts are CaCl2, solution temperature is 70 DEG C；
(7) drop of aramid fiber solution on aramid fiber composite base paper the regeneration of aramid fiber composite base paper: is added dropwise in meta-aramid solution
Dosage is 3 times of aramid fiber composite base paper bone dry fiber quality, and the aramid fiber extrusion coating paper that aramid fiber solution is added dropwise is placed in air, virtue is made
By the meta-aramid pulp fibers of local dissolution in paper in the meta-aramid fibers and paper structure being dissolved in synthetic fibre solution
It is regenerated to obtain regeneration aramid fiber composite base paper in structure；
(8) it is remaining in paper to remove that the regeneration aramid fiber composite base paper obtained through step (7) heat pressing process: is washed with clear water
Organic solvent and inorganic salts, paper it is dry after carries out hot-pressing processing with vulcanizing press again, hot pressing temperature is 200 DEG C, is pressed
Power is 5MPa, hot pressing time 10min, finally obtains the regeneration aramid fiber extrusion coating paper of fiber combination closely.
Aramid fiber composite base paper made from the present embodiment regeneration aramid fiber extrusion coating paper obtained and the present embodiment step (5) compares,
With a thickness of 81 μm, tensile strength increases to 83.24MPa by the 4.36MPa of script, increases nearly 18 times, and dielectric strength is
33KV/mm。
Embodiment 6
A kind of preparation method regenerating aramid fiber extrusion coating paper, includes the following steps:
(1) outfit of pretreatment fluid: isopropanol is dissolved in the water and is diluted to the solution that mass fraction is 50%, obtains pre- place
Liquid is managed, it is spare；
(2) fiber pre-processes: under the conditions of pretreatment fluid provisioned in step (1) to be maintained to 30-40 DEG C of temperature, to virtue
Synthetic fibre fiber is pre-processed, and pretreating process is with the aqueous isopropanol processing fiber 70min for just covering fibre weight, when processing
It needs to carry out collaboration processing with ultrasonic wave, ultrasonic power 50w is primary every needs stirring in 10 minutes, will be fragrant after having handled
Synthetic fibre chopped strand cleans drying and obtains pretreated aramid fiber；
(3) fiber surface modification: step (2) pretreated aramid short fiber obtained and p-aramid fiber are starched
Dregs of rice fiber and meta-aramid pulp fibers are modified processing with coupling agent, and it is coupling agent that coupling agent, which is configured to mass ratio:
Water is the solution of 4:6, and coupling agent dosage is 70ml/g by over dry aramid fiber quality, and constant temperature is under the conditions of 40-50 DEG C of temperature, place
The reason time be 200min, the coupling agent be titanate coupling agent, handle after use clear water aramid fiber clean and dry to
Constant weight obtains the aramid fiber being modified；
(4) paper making technique: the modification of p-aramid fiber chopped strand and 20 mass parts that 30 mass parts have been modified is well
Para-aramid pulp fiber and the meta-aramid pulp fibers that have been modified of 50 mass parts mix and use waterpower fluffer in revolving speed
It is dispersed in water to discongest 40000r under conditions of 2500rpm to form fiber dispersion and paper making additive is added, auxiliary agent adds
Carrying capacity is the 2.5% of bone dry fiber quality, and the paper making additive is hydroxyethyl cellulose and poly dimethyl allyl dimethyl
Ammonium chloride, wherein the additional amount of hydroxyethyl cellulose is the 0.5% of bone dry fiber quality used, poly dimethyl allyl chlorination
The dosage of ammonium is the 2.0% of bone dry fiber quality used, with automatic paper machine dehydration forming, the aramid fiber that the present embodiment is manufactured paper with pulp
The quantification of 30g/m of composite base paper2。
(5) paper is dry: the aramid paper made from step (4) flies to the compound original of aramid fiber after drying under vacuum conditions
Paper, drying temperature are 95 DEG C；
(6) prepared by aramid fiber solution: it is inorganic dissolved with 1 mass parts that the meta-aramid fibers of 2 mass parts being dissolved in 50 mass parts
Aramid fiber solution is obtained in the highly polar organic solvent solution of salt, highly polar organic solvent described in the present embodiment is NMP, affiliated
Inorganic salts are LiCl, and solution temperature is 75 DEG C；
(7) dripping quantity of aramid fiber solution on aramid fiber composite base paper the regeneration of aramid fiber composite base paper: is added dropwise in aramid fiber solution
It is 1.7 times of aramid fiber composite base paper bone dry fiber quality, the aramid fiber extrusion coating paper that aramid fiber solution is added dropwise is placed in air, aramid fiber is made
By the meta-aramid pulp fibers of local dissolution in paper knot in the meta-aramid fibers and paper structure being dissolved in solution
It is regenerated to obtain regeneration aramid fiber composite base paper in structure；
(8) it is remaining in paper to remove that the regeneration aramid fiber composite base paper obtained through step (7) heat pressing process: is washed with clear water
Organic solvent and inorganic salts, paper it is dry after carries out hot-pressing processing with vulcanizing press again, hot pressing temperature is 150 DEG C, is pressed
Power is 10MPa, hot pressing time 6min, finally obtains the regeneration aramid fiber extrusion coating paper of fiber combination closely.
Aramid fiber composite base paper made from the present embodiment regeneration aramid fiber extrusion coating paper obtained and the present embodiment step (5) compares,
With a thickness of 79 μm, tensile strength increases to 81.74MPa by the 4.36MPa of script, increases 18 times, and dielectric strength is
33KV/mm。
The method of the regeneration aramid fiber extrusion coating paper of high intensity prepared by the present invention has simple process, enhancing effect compared with prior art
The advantage that fruit is significant, regeneration aramid fiber extrusion coating paper mechanical strength and dielectric properties obtained are preferable.Present invention also avoids existing skills
It is comprehensive that art enhances and pass through aramid paper caused by other meldable fibres of introducing using resin dipping during carrying out aramid paper enhancing
The problems such as performance declines is closed, regenerated meta-aramid can make paper more consolidation in paper structure, perfect filling and cladding
Hole in paper structure, the paper structure of this compact facilitate mentioning significantly for paper mechanical performance and dielectric properties
It rises.Paper made from the present embodiment is made it possible to and is applied to as paper base in high-frequency high-speed due to its excellent dielectric properties
In substrate, high-frequency high-speed communication is realized, the very good mechanical properties that fine and close paper structure is facilitated are but also it can be used for manufacturing
Low-density and high-strength material needed for train, automobile, aircraft, ship etc..In addition, method provided by the invention is also domestic aramid fiber
The mechanical performance optimization and dielectric properties optimization of paper provide new approaches.
Claims (10)
1. a kind of preparation method for regenerating aramid fiber extrusion coating paper, it is characterised in that include the following steps and process conditions:
1) outfit of pretreatment fluid: configuration surface activator solution or organic solvent solution obtain pretreatment fluid, spare；
2) p-aramid fiber chopped strand pre-processes: there are residual impurities when spinning to surface for the pretreatment fluid provisioned in step 1)
P-aramid fiber chopped strand pre-processed；Pretreating process is the pretreatment fluid processing fiber 10- with covering fibre weight
120min carries out collaboration processing with ultrasonic wave when processing, and ultrasonic power 50-100w is primary every stirring in 10-20 minutes,
Pretreated temperature is 25-80 DEG C, and aramid short fiber is cleaned drying after having handled, it is short to obtain pretreated p-aramid fiber
Cut fiber；
3) fiber surface modification: step 2) pretreated p-aramid fiber chopped strand obtained and p-aramid fiber are starched
At least one of dregs of rice fiber and meta-aramid pulp fibers one reinstates coupling agent and carries out graft modification processing, and coupling agent loading capacity is pressed
Aramid fiber oven-dry weight is calculated as 10-190ml/g, and treatment temperature is 25-70 DEG C, and the processing time is 30-240min；The coupling
Agent is one of KH-550, KH-560, KH-570, titanate coupling agent and KH-792 or a variety of；
4) paper making technique: will through step 3) treated p-aramid fiber chopped strand and para-aramid pulp fiber and/
Or meta-aramid pulp fibers are all wash with distilled water, remove remaining coupling agent；Then gained fiber is dispersed in water
In and paper making additive is added；With automatic paper machine at paper；
5) paper is dry: will obtain aramid fiber composite base paper after aramid paper made from step 4) is dry under elevated temperature in vacuo；
6) prepared by aramid fiber solution: meta-aramid fibers being dissolved in the highly polar organic solvent solution dissolved with inorganic salts and obtain virtue
Synthetic fibre fiber solution, solution temperature are 25-100 DEG C；
7) the aramid fiber composite base paper made from step 5) regeneration of aramid fiber extrusion coating paper: is added dropwise in aramid fiber solution made from step 6)
On, it is placed in air, dissolved meta-aramid fibers is made to be regenerated to obtain regeneration aramid fiber composite base paper in paper structure；
The amount of the aramid fiber solution is the 100%-300% of paper bone dry fiber quality；
8) heat pressing process: the regeneration aramid fiber composite base paper that step 7) is obtained carries out high temperature and pressure hot-pressing processing；
9) washing process: with clear water washing step 8) obtained paper and regeneration aramid fiber extrusion coating paper is obtained after drying.
2. a kind of preparation method for regenerating aramid fiber extrusion coating paper according to claim 1, which is characterized in that described in step 1)
Surfactant be one of neopelex, polyacrylamide, stearic acid, fatty glyceride or a variety of,
The mass fraction of surfactant solution is 1-10%, and the organic solvent is one of ethyl alcohol, acetone, isopropanol or more
Kind, the mass fraction of organic solvent solution is 30-70%.
3. a kind of preparation method for regenerating aramid fiber extrusion coating paper according to claim 1, which is characterized in that the pre- place of step 2)
In science and engineering skill, the dosage of pretreatment fluid covers aramid fiber, stirs in treatment process every 5-30min primary.
4. a kind of preparation method for regenerating aramid fiber extrusion coating paper according to claim 1, which is characterized in that described in step 3)
The coupling that the coupling agent -ol solution or mass ratio that coupling agent is pure coupling agent or mass ratio is 1:1.0-5.0 are 1:1.0-5.0
Coupling agent -ol-aqueous solution that agent-aqueous solution or mass ratio are 1:1.5-4.5:0.5-1.5.
5. a kind of preparation method for regenerating aramid fiber extrusion coating paper according to claim 1, which is characterized in that described in step 4)
The length of aramid short fiber and ppta-pulp fibre is 3-8mm, by percentage to the quality, the accounting of p-aramid fiber chopped strand
Accounting for 20%-60%, para-aramid pulp fiber is 0%-60%, the accounting of meta-aramid pulp fibers is 0%-
80%, the quantification of 20-200g/m of paper is prepared2。
6. a kind of preparation method for regenerating aramid fiber extrusion coating paper according to claim 1, which is characterized in that described in step 4)
By gained fiber it is evenly dispersed be to be discongested with waterpower fluffer in the case where revolving speed is 2000-3000rpm in water；The dispersing agent packet
Include cationic polyacrylamide, anionic polyacrylamide, non-ionic polyacrylamide, polyethylene glycol oxide, detergent alkylate sulphur
One of sour sodium, lauryl sodium sulfate and hydroxyethyl cellulose are a variety of, and the dispersing agent additional amount is that over dry used is fine
Tie up the 0.1-1.0% of quality；The retention and drainage aid agent includes cationic starch, diallyl dimethyl ammoniumchloride, polyethylene
One of alcohol, cationic polyacrylamide, anionic polyacrylamide and non-ionic polyacrylamide are a variety of, the retention
Filter aid additional amount is the 0.5-5.0% of bone dry fiber quality used.
7. a kind of preparation method for regenerating aramid fiber extrusion coating paper according to claim 1, which is characterized in that in step 5), very
Temperature when sky is dry is 50 DEG C -110 DEG C.
8. a kind of preparation method for regenerating aramid fiber extrusion coating paper according to claim 1, which is characterized in that in step 6), institute
Stating organic solvent is one of DMSO, DMF, DMAC and NMP or a variety of, and the inorganic salts are LiCl2、CaCl2、MgCl2In
It is one or more, the concentration of the aramid fiber solution being prepared is 2%-30%.
9. a kind of preparation method for regenerating aramid fiber extrusion coating paper according to claim 1, which is characterized in that in step 7), drop
The quality of the aramid fiber solution added is the 100%-300% of paper bone dry fiber quality.
10. a kind of preparation method for regenerating aramid fiber extrusion coating paper according to claim 1, which is characterized in that step 8) is described
The hot pressing temperature of high temperature and pressure hot pressing is 100-300 DEG C, pressure 5-15MPa, time 2-20min.
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| CN111472191A (en) * | 2020-04-14 | 2020-07-31 | 山东聚芳新材料股份有限公司 | Para-aramid fiber plate and preparation method thereof |
| CN112227062A (en) * | 2020-10-14 | 2021-01-15 | 天津科技大学 | Ultrasonic-assisted phosphoric acid hydrophilic modification method for para-aramid fiber |
| CN113136739A (en) * | 2021-04-21 | 2021-07-20 | 陕西科技大学 | Method for improving interface bonding strength of aramid fiber mica paper |
| CN113136739B (en) * | 2021-04-21 | 2023-02-24 | 陕西科技大学 | Method for improving interface bonding strength of aramid fiber mica paper |
| CN113914129A (en) * | 2021-09-17 | 2022-01-11 | 南通中菱电力科技股份有限公司 | Preparation process of insulating aramid paper material |
| CN113914129B (en) * | 2021-09-17 | 2022-11-04 | 南通中菱电力科技股份有限公司 | Preparation process of insulating aramid paper material |
| CN113981731A (en) * | 2021-11-03 | 2022-01-28 | 润华(江苏)新材料有限公司 | Mixed pulp and high-hydrophobicity paper |
| CN113981731B (en) * | 2021-11-03 | 2022-12-09 | 润华(江苏)新材料有限公司 | Mixed pulp and high-hydrophobicity paper |
| CN114573844A (en) * | 2022-03-17 | 2022-06-03 | 中国科学技术大学 | Pearl-mother-like aramid fiber-mica nano paper and preparation method thereof |
| CN117966512A (en) * | 2024-03-26 | 2024-05-03 | 烟台民士达特种纸业股份有限公司 | Special paper, preparation method and application |
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