CN104746383B - A kind of high Air permenbility fiber and preparation method thereof - Google Patents
A kind of high Air permenbility fiber and preparation method thereof Download PDFInfo
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Abstract
A kind of high Air permenbility fiber and preparation method thereof, its raw fibre is by screening, extrusion dehydration, and slurry is in a loose state by NaOH processing, adverse current dealkalize washing, extruding, low temperature drying.Gained fiber Air permenbility is up to 1700 2200L/m2.s, and fibre strength is good, and yield is high.It is high that concentration of lye is reclaimed in processing procedure, it is repeatable to be used in papermaking etc., reduce production cost.
Description
Technical field
The present invention relates to a kind of string and preparation method thereof, specifically, being related to the plant of a kind of low stain, high Air permenbility
Fibres and itself and preparation method, for advanced filter paper manufacturing, affiliated pulping and paper-making field.
Background technology
Filter paper is to be properly added chemistry with the one or more in string, synthetic fibers, inorfil for raw material
Auxiliary agent and filler, there is good strainability, loose porous filter medium using what papermaking technology was manufactured paper with pulp.It is as one
The effective filter medium of kind, filter paper are widely used for every field.Different, the filtering according to the kinds of fibers of composition filter paper
Performance, the purposes of paper are also different, there is the ordinary filter paper for general occasion, for the glass fiber filter paper under high temperature, also have
Ultra-clean polypropylene filter paper etc..
Air permenbility (gas permeation amount) is under steady temperature and unit pressure difference, when gas stably passes through, during unit
The volume of the interior gas through sample unit area, conventional unit L/m2.s.Air permenbility is filtering gas or liquid paper
Important technology index.For the high Air permenbility paper such as advanced filter paper, cotton fiber material is typically used relatively broadly or is washed
Synthetic fibre material.Cotton fiber need to be planted by arable land and obtained, its limits throughput, and cotton fiber is longer, and homogeneity is poor, processes high saturating
Tolerance paper has certain shortcoming.Polyester fiber material can improve the intensity of speciality paper to a certain extent, but useless after its use
Gurry also enormous amount, from environment and Ecological Effect it is contemplated that as the high polymer for being difficult to degrade in natural environment, terylene it is useless
Gurry has become one of global environomental pollution source.And a kind of high penetration, high-intensity wood pulp fibres are provided, use it for making
Standby filter paper, is advantageous for environmental protection, meets national environmental protection policy.Therefore, special propose the present invention.
The content of the invention
It is an object of the present invention to provide a kind of preparation method of high Air permenbility fiber, this method is with fine by wood pulp
Tie up as raw material, the fiber of high Air permenbility is prepared by base extraction, while more than 95% aqueous slkali is reclaimed, return
The NaOH solution concentration of receipts is high, available for the slurrying production or sale of other paper pulp, so as to reduce production cost, realizes production
The zero-emission of waste water.
It is a further object to provide a kind of high Air permenbility fiber, the Air permenbility of the fiber reaches 1700L/m2.s
More than, and other mechanical performances keep good.
To realize the purpose of the present invention, adopt the following technical scheme that as follows：
A kind of preparation method of high Air permenbility fiber, comprises the following steps：
(1) raw material is handled：It is raw material from wood pulp, wherein, the length of wood pulp cellulose is chosen between 1-4mm,
(2) alkali process：The wood pulp liquid of step (1) is mixed with aqueous slkali and carries out alkali process, the matter of mixed aqueous slkali
Amount percent concentration is 12-22%；
(3) aqueous slkali is eluted：Wood pulp is washed after step (2) processing, and the pH value for being washed to eluent is 6.5-7.5
Untill, the temperature control of water is added at 60-90 DEG C；
(4) wood pulp after step (3) dealkalize solution carries out dewater treatment, and then, the wood pulp after dehydration is dried, to fibre
Untill moisture is tieed up as 5-15%.
A kind of high Air permenbility fiber, its product fiber Air permenbility reach 1700L/m2.s more than.
The preparation method to a kind of high Air permenbility fiber of the invention and the high-air-permeability fiber being prepared enter below
The detailed introduction of one step.
A kind of preparation method of high Air permenbility fiber, comprises the following steps：
(1) raw material is handled：It is raw material from wood pulp, wherein, the length of wood pulp cellulose is chosen between 1-4mm,
(2) alkali process：The wood pulp liquid of step (1) is mixed with aqueous slkali, the mass percent concentration of aqueous slkali is 12-
22%；
(3) aqueous slkali is eluted：Wood pulp is washed after step (2) processing, and the pH value for being washed to eluent is 6.5-7.5
Untill, the temperature control of water is at 60-90 DEG C；
(4) wood pulp after step (3) dealkalize solution carries out dewater treatment, and then, the wood pulp after dehydration is dried, to fibre
Untill moisture is tieed up as 5-15%, high Air permenbility fiber is obtained.
Further, described wood pulp includes but is not limited to softwood pulp, hardwood pulp, and it is preferred, softwood pulp.
Described wood pulp can be the wood pulp or true qualities wood pulp of bleaching.Described true qualities wood pulp is referred to as not floating wood
Slurry.
Raw material can directly select wood pulp liquid, filter out wood pulp of the wood pulp cellulose length between 1-4mm as raw material.
It can be raw material from the dry wood pulp of long fibre, through the broken machine pulping of water to starching dense 1 ± 0.5%, then carry out fiber classification screening, choose
Fiber between fibre length 1-4mm carries out subsequent treatment.
Further, the length of described wood pulp cellulose is 2-3mm；More preferably 2.4-2.5mm.
Further, the concentration of the wood pulp of step (1) is 30-50%.
The raw material of the present invention uses common wood pulp, it is preferred that the physical property of raw material of wood pulp of the invention is as follows：Split
Disconnected long 2.1-3.37km, tear index 13-20.1mN.m2/g。
During using long fibre dry pulp as raw material, it is 30-50% that the slurries after screening, which carry out extrusion dehydration to concentration,.
It is used to other paper pulp after chopped fiber dehydration after screening use.
The raw material for preparing high Air permenbility fiber in the present invention selects fiber of the length between 1-4mm, this specification
Fiber prepares advanced filter paper after processing, and the contact site between fiber and fiber is not have too short fiber filling,
It ensure that the gas permeability of filter paper.And chopped fiber wood pulp can be also used for other slurrying use.
Further, in step (2), after wood pulp liquid mixes with aqueous slkali, the concentration of wood pulp is 1-30%, and it is preferably 5-
10%.
Further, in step (2), the temperature of alkaline solution treatment is 20-50 DEG C.It is preferred, and the temperature of alkali process is 25-
40 DEG C, it is further preferred that the temperature of alkali process is 25-30 DEG C.
Further, in step (2), aqueous slkali temperature handles 10-60 minutes under conditions of being 20-50 DEG C.
Further, in step (2), aqueous slkali temperature handles 20-30 minutes under conditions of being 25-30 DEG C.
Further, the mass percent concentration of aqueous slkali is 18.5-21%.
Described aqueous slkali can be the solution of alkali metal hydroxide, and it is preferably sodium hydroxide solution.
In the present invention, during alkali process, by being 12-22% alkaline solution treatment wood pulps, preferably hydrogen-oxygen from concentration
Change sodium solution, meanwhile, in 20-50 DEG C of processing of temperature.Class cylinder is presented in wood pulp cellulose after processing, and its specific surface area can subtract
It is small.Profile and specific surface area possessed by wood pulp cellulose after handling under this condition, it is manufactured paper with pulp as after filter paper, fiber
Being contacted with the contact surface of very little between fiber, substantially increases the Air permenbility of filter paper, and dust containing capacity is big.
Wood pulp after alkali process adds the temperature control of water at 60-90 DEG C by washing.Washed at such a temperature,
The physical property of the fiber of the high Air permenbility obtained after drying keeps good.The reason for specific, is still not clear, and inventor pushes away
Survey, during alkali process, uneven additional tension caused by the fracture of glucoside key and swelling action, fine in cellulose macromolecule
The mechanical strength of dimension reduces.Wood pulp of the present invention after 60-90 DEG C of washing alkali process, handle outside unnecessary alkali lye removing, can
It can tend to be uniform by additional tension caused by cellulose macromolecule inside at such a temperature, the mechanical strength extent of damage of fiber is significantly
Reduce, and dispersive property is good.It is comprehensive while wood pulp cellulose maintains higher Air permenbility after said process of the present invention processing
The physical property of conjunction keeps fine.
In water-washing process, the temperature for adding water is preferably controlled in 70-80 DEG C.
Further, countercurrent washing regime is used in the water-washing process of step (3).
The concentration of the wood pulp flowed out after countercurrent washing is 25-60%, pH value 6.5-7.5.
The alkaline concentration flowed out after countercurrent washing is 8-20%.The aqueous slkali, which can reclaim, to be utilized, for other systems
Slurry production is sold.There is no discharge of wastewater during dealkalize.
It is furthermore preferred that adverse current washing is carried out repeatedly, the slurry dealkalize first after processing, dealkalize disposed slurry concentration is 20-
50%；Multiple countercurrent washing is carried out again, and final discharge concentration is 25-60%, pH value 6.5-7.5.
In step (4), dry temperature control is at 50-120 DEG C.
Described drying can use drying cylinder drying, crawler belt drying or airflow drying.Drying cylinder or crawler belt drying temperature 70-
130 DEG C, more preferably 90-110 DEG C.40-90 DEG C of airflow drying temperature, more preferably 50-70 DEG C.
The wood pulp cellulose of the present invention is carried out with loose condition (of surface) in process, i.e. is wood pulp liquid.
A kind of high Air permenbility fiber, its product fiber Air permenbility reach 1700L/m2.s more than, its preferred 1700-2200L/
m2.s。
Further, the mechanical performance reduction amplitude of described high Air permenbility fiber is very low, and fiber condition is naturally, scattered use
Performance is good.
High Air permenbility fiber provided by the invention can be individually used for filter paper of manufacturing paper with pulp, can also with chemical fibre and/or
Glass fibre mixes filter paper of manufacturing paper with pulp.
Preferably, described high Air permenbility fiber is individually used for advanced filter paper slurry of manufacturing paper with pulp.
The chemical fibre includes but is not limited to terylene.
Compared with prior art, the advantage of protrusion of the invention is：
Used wood pulp cellulose raw material is the softwood pulp by sizing screening, and fibre length homogeneity is good, is sieved
Chopped fiber out can not wasted with other paper grade (stock)s, raw material.The wood pulp that fibre length is 1-4mm is by basic treatment, process
Countercurrent washing dealkalize dehydration equipment recovery alkali lye is recycled, and saves alkali lye.Passed through countercurrent washing dealkalize dehydration equipment
Adverse current outlet concentration of lye is high, is advantageously used for other slurrying productions or sells, and not waste discharge in production process, does not pollute ring
Border.Obtained fabric hand is fluffy, bright in color, fibre length are homogeneous, state is naturally, have higher Air permenbility, up to 1700-
2200L/m2.s, has a good dispersive property, and performance is preferable.Instead of to a certain extent resource scarcity cotton fiber and
Nondegradable terylen fiber, reduce the pollution of environment.
Embodiment
High Air permenbility fiber and preparation method thereof of the present invention is described in further detail below, it is of the invention in instances
Preferable physical property described in the content of the invention using the present invention of raw material of wood pulp.The protection domain of the application is not limited, its
Protection domain is defined with claims.Some disclosed details provide comprehensive understanding to each disclosed embodiment.
However, those skilled in the relevant art know, one or more of these concrete details are not used, and use other materials etc.
Situation can also realize embodiment.
Embodiment 1
Bleaching needle-point leaf pulp is put into the broken machine of water, pulping concentration 1%, is pumped to fractionating screen and is sieved, length
Fiber separation, long fibre average fiber length 2.4mm.To starching dense 50%, chopped fiber tail slurry is dehydrated the good slurry extrusion dehydration of long fibre
It is used to other paper pulp afterwards use.The good slurry of long fibre is put into NaOH solution and handled, concentration for the treatment of 14%, the time 40 divides
Clock, 20 DEG C of temperature, countercurrent washing dealkalize dewaterer is pumped to after terminating, the temperature for adding water is 80 DEG C, and high alkali liquid is returned
Receive, dense 40% is starched after dealkalize, into countercurrent washing area, countercurrent washing lye export alkali dense 8%, slurry exit concentration after dehydration
50%, pH value 7.2.Dried into airflow dryer, 55 DEG C -70 DEG C of drying temperature, finished product moisture content 10%.Packing is sold.
Embodiment 2
Bleaching needle-point leaf pulp is put into the broken machine of water, pulping concentration 1%, is pumped to fractionating screen and is sieved, length
Fiber separation, long fibre average fiber length 2.5mm.To starching dense 50%, chopped fiber tail slurry is dehydrated the good slurry extrusion dehydration of long fibre
It is used to other paper pulp afterwards use.The good slurry of long fibre is put into NaOH solution and handled, concentration for the treatment of 17%, the time 30 divides
Clock, 27 DEG C of temperature, countercurrent washing dealkalize dewaterer is pumped to after terminating, the temperature for adding water is 70 DEG C, and high alkali liquid is returned
Receive, dense 43% is starched after dealkalize, into countercurrent washing area, countercurrent washing lye export alkali dense 12%, slurry exports dense after dehydration
Degree 52%, pH value 7.1.Dried into airflow dryer, 65 DEG C -75 DEG C of drying temperature, finished product moisture content 9%.Packing is sold.
Embodiment 3
True qualities softwood pulp is put into the broken machine of water, pulping concentration 1%, is pumped to fractionating screen and is sieved, length
Fiber separation, long fibre average fiber length 2.5mm.To starching dense 50%, chopped fiber tail slurry is dehydrated the good slurry extrusion dehydration of long fibre
It is used to other paper pulp afterwards use.The good slurry of long fibre is put into NaOH solution and handled, concentration for the treatment of 17%, the time 30 divides
Clock, 27 DEG C of temperature, countercurrent washing dealkalize dewaterer is pumped to after terminating, the temperature for adding water is returned for 90 DEG C to high alkali liquid
Receive, dense 43% is starched after dealkalize, into countercurrent washing area, countercurrent washing lye export alkali dense 12%, slurry exports dense after dehydration
Degree 52%, pH value 7.1.Baked into cylinder dried area into tabular, 80-110 DEG C of drying temperature, finished product moisture content 9%.Pack out
Sell.
Embodiment 4
True qualities softwood pulp is put into the broken machine of water, pulping concentration 1%, is pumped to fractionating screen and is sieved, length
Fiber separation, long fibre average fiber length 2.0mm.To starching dense 45%, chopped fiber tail slurry is dehydrated the good slurry extrusion dehydration of long fibre
It is used to other paper pulp afterwards use.The good slurry of long fibre is put into NaOH solution and handled, concentration for the treatment of 20%, the time 30 divides
Clock, 30 DEG C of temperature, countercurrent washing dealkalize dewaterer is pumped to after terminating, the temperature for adding water is returned for 80 DEG C to high alkali liquid
Receive, dense 45% is starched after dealkalize, into countercurrent washing area, countercurrent washing lye export alkali dense 15%, slurry exports dense after dehydration
Degree 52%, pH value 7.1.Baked into cylinder dried area into tabular, 80-110 DEG C of drying temperature, finished product moisture content 9%.Pack out
Sell.
Experimental example 1
Cardboard is manufactured paper with pulp into using fiber obtained by embodiment 1-3 respectively and carries out air filtration performance and the inspection of other performances
Survey.
In the present invention to the performance parameter of the high Air permenbility fiber after processing with reference to GB/T 24323-2009 and
QBT1461-1992 is measured.
| Parameter | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Examination criteria |
| Air permenbility (L/m2.s) (100g is quantitative) | 1852 | 2016 | 1987 | 1997 | QBT1461-1992 |
| Fracture length (km) | 0.06 | 0.05 | 0.06 | 0.05 | GB/T 24323-2009 |
| Tear index (mN.m2/g) | 2.0 | 1.9 | 2.1 | 2.0 | GB/T 24323-2009 |
| Tensile index (N.m/g) | 0.6 | 0.55 | 0.6 | 0.6 | GB/T 24323-2009 |
| Fiber dispersion | Well | Well | Well | Well |
Experimental example 2
The technological process of this experimental example and other technological parameters referring to embodiment 1, unlike, by different temperatures
Water-washing process, the influence to fiber physical property.The equal reference implementation example 1 of other conditions, it is as a result as shown in the table：
Because fiber dispersion is poor, produces page and spend poor, physical index is relatively low
| Washing temperature (DEG C) | 20 | 40 | 100 |
| Fracture length (km) | 0 | 0.01 | 0.03 |
| Tear index (mN.m2/g) | 0 | 0.5 | 1.2 |
| Tensile index (N.m/g) | 0 | 0.1 | 0.2 |
| Fiber dispersion | Extreme difference | Difference | Well |
The Air permenbility that this experimental example can be seen that the high Air permenbility fiber of the preparation method meaning of the present invention is high, other things
Reason can keep good, may be advantageously employed in filter paper.
Claims (15)
1. a kind of preparation method of high Air permenbility fiber, comprises the following steps：
(1) raw material is handled：It is raw material from wood pulp, wherein, the length of wood pulp cellulose is chosen between 1-4mm；
(2) alkali process：The wood pulp liquid of step (1) is mixed with aqueous slkali and carries out alkali process, the quality hundred of mixed aqueous slkali
Point specific concentration be 18.5-21%, processing 20-30 minutes under conditions of the temperature of alkali process is 25-30 DEG C；
(3) aqueous slkali is eluted：Wood pulp is washed after step (2) processing, and the pH value for being washed to eluent is that 6.5-7.5 is
Only, the temperature control of water is added at 60-90 DEG C；
(4) wood pulp after step (3) dealkalize solution carries out dewater treatment, and then, the wood pulp after dehydration is dried, to fiber water
Untill dividing content to be 5-15%.
2. preparation method according to claim 1, it is characterised in that the concentration of the wood pulp of step (1) is 30-50%, institute
The wood pulp stated is bleached wood pulp or true qualities wood pulp.
3. preparation method according to claim 1, it is characterised in that in step (2), wood pulp liquid mixes with aqueous slkali
Afterwards, the concentration of wood pulp is 1-30%.
4. according to the preparation method described in claim any one of 1-3, it is characterised in that in step (3), add the temperature of water
Control is at 70-80 DEG C.
5. according to the preparation method described in claim any one of 1-3, it is characterised in that described aqueous slkali is alkali metal hydrogen-oxygen
The solution of compound.
6. according to the preparation method described in claim any one of 1-3, it is characterised in that adopted in the water-washing process of step (3)
With countercurrent washing regime, the concentration of the wood pulp flowed out after countercurrent washing is 25-60%, pH value 6.5-7.5.
7. according to the preparation method described in claim any one of 1-3, it is characterised in that in step (4), dry temperature control
System is at 50-120 DEG C.
8. preparation method according to claim 1, it is characterised in that the length of described wood pulp cellulose is 2-3mm.
9. preparation method according to claim 1, it is characterised in that the length of described wood pulp cellulose is 2.4-2.5mm.
10. preparation method according to claim 3, it is characterised in that the concentration of wood pulp is 5-10%.
11. preparation method according to claim 6, it is characterised in that described aqueous slkali is sodium hydroxide solution.
12. a kind of high Air permenbility fiber, the Air permenbility of the fiber reach 1700L/m2.s more than, described high Air permenbility fiber
Preparation method comprises the following steps：
(1) raw material is handled：It is raw material from wood pulp, wherein, the length of wood pulp cellulose is chosen between 1-4mm；
(2) alkali process：The wood pulp liquid of step (1) is mixed with aqueous slkali and carries out alkali process, the quality hundred of mixed aqueous slkali
It is 18.5-21% to divide specific concentration；
(3) aqueous slkali is eluted：Wood pulp is washed after step (2) processing, and the pH value for being washed to eluent is that 6.5-7.5 is
Only, the temperature control of water is added at 60-90 DEG C；
(4) wood pulp after step (3) dealkalize solution carries out dewater treatment, and then, the wood pulp after dehydration is dried, to fiber water
Untill dividing content to be 5-15%.
13. preparation method according to claim 12, it is characterised in that in step (1), choose the length of wood pulp cellulose
For 2-3mm.
14. preparation method according to claim 12, it is characterised in that in step (1), choose the length of wood pulp cellulose
For 2.4-2.5mm.
15. preparation method according to claim 12, it is characterised in that in step (3), the temperature control for adding water exists
70-80℃。
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| JP4978660B2 (en) * | 2009-06-03 | 2012-07-18 | 富士紡ホールディングス株式会社 | Knitted fabric with excellent contact cooling feeling and contact cooling feeling underwear using the knitted fabric |
| CN101988279A (en) * | 2009-08-06 | 2011-03-23 | 苏州新业造纸有限公司 | Production process of oil-water separation filter paper |
| CN102121205B (en) * | 2010-12-21 | 2012-03-21 | 张金 | Wood and bamboo fiber mercerizing pulp and preparation method thereof |
| CN102936771B (en) * | 2012-11-12 | 2013-08-21 | 无锡市天然绿色纤维科技有限公司 | High count mercerized single yarn and double faced mercerized silk and processing method thereof |
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