CN103981635B - Preparation method of porous fiber non-woven fabric - Google Patents
Preparation method of porous fiber non-woven fabric Download PDFInfo
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- CN103981635B CN103981635B CN201410194308.4A CN201410194308A CN103981635B CN 103981635 B CN103981635 B CN 103981635B CN 201410194308 A CN201410194308 A CN 201410194308A CN 103981635 B CN103981635 B CN 103981635B
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Abstract
The invention relates to a preparation method of a porous fiber non-woven fabric. The aim of the preparation method is to improve the product performance of the conventional non-woven fabric, so that the non-woven fabric meets the requirements on high-precision and high-performance filter. The technical scheme is that the preparation method of the porous fiber non-woven fabric comprises the following steps in sequence: (1) uniformly mixing a polymer and a diluent to obtain a blend with 10 to 60 percent of polymer; (2) melting and extruding the blend in the step (1) by adopting a screw extruder granulator, and directly cooling and granulating in air; (3) producing master batches in the step (2) by melt-down equipment to obtain a primary non-woven fabric; (4) extracting to remove the diluent from the primary non-woven fabric in the step (3), performing pore-forming on fibers in the non-woven fabric, and drying to obtain the porous fiber non-wave fabric; (5) recovering mixed waste liquid of the diluent and an extraction agent for reuse.
Description
Technical field
The invention belongs to fabrics for industrial use field, be specifically related to one by Thermal inactive hole creating technology with molten
Spray technique combines the method preparing porous fibre non-woven fabrics, prepared non-woven fabrics can be used for environmental protection, water processes,
Air filtration etc..
Background technology
Melt blown technology is dependent at a high speed, high temperature gas flow (very close to melting point polymer) winding-up polymer melt makes it obtain
Prepare a kind of method of superfine fibre to stretching rapidly, can one step forming be non-woven fabrics.Pass through melt blown technology
The non-woven fabrics being assembled into by fiber amorphous packings produced, has the most excellent structural property, as fiber surpasses
Carefully, specific surface area is big, porosity is high, pore space structure is mutually communicated, solutes accumulation resistance is little, the suitableeest
Share work adsorb and filter separation material.Melt spraying non-woven fabrics product defends protection (haze, bird flu, air doctor
Purify), thermal, absorbing sound and lowering noise, the field such as sewage disposal (municipal wastewater, crude oil pollution adsorb) have
Unique advantage.Melt blown technology technological process is short, and production efficiency is high, and the yearly productive capacity of a production line is
Hundred tons to kiloton rank.Due to high content of technology, market prospect is big, and its level of development has become as measurement one
One of important symbol of individual country textile industry comprehensive strength.But, existing melt blown technology still suffers from some not
In place of foot: the processing highly energy-consuming of pure melt, die head and hot air temperature often require more than 260 DEG C, and this can make again
Become depolymerization problem；Pure melt viscosity is big, extrusion difficulty；Master batch fluidity of molten is required higher,
The melt-blown PP Pipe Compound of high fusion index need to be used, as required to use the melt index polypropylene more than 800g/10min female
Grain, its need to by degraded conventional polypropylene or with metallocene catalysis produce obtain, price compares conventional polypropylene
Master batch expensive more than 50%.
Existing melt spraying non-woven fabrics product still cannot meet high accuracy and high-performance filtration requirement, as haze mask,
Automobile/tank engine is dust-proof, as to improve its product using effect or performance further, increased it
Specific surface area, this by fibre diameter is reduced to nanoscale and can introduce two kinds of approach realizations of loose structure.
Nonwoven Technologies company uses the spinneret orifice of a diameter of 63.5 μm, is prepared for fibre diameter big
Being about the polypropylene fibre of 500nm, but the method yields poorly, spinneret price is abnormal expensive simultaneously, also
Easily cracking and plug, production cost is the highest.The most domestic melt-blowing equipment and pp material all cannot be expired
The working condition of foot nanofiber.The introducing of loose structure can be by adding not phase in meltblown polymer master batch
The inorganic nano-particle held or polymer, then dissolved by solvent or the method calcined carrys out selective removal
Pore-forming, but the method can cause fibre machinery performance to be greatly reduced and there is the incomplete problem of dissolving.
Thermal inactive technology (thermally induced phase separation is called for short TIPS) is to send out in recent years
A kind of polymer forming hole method that generated is ripe.In 1980, Castro etc. first proposed TIPS and prepares micropore
The method of film, and apply for United States Patent (USP) US Patent424798.TIPS ultimate principle is as follows: non-for many
Polarity or low pole thermoplastic crystalline's high polymer, at normal temperatures with some high boiling little molecular fluid (diluent)
Immiscible, but (the generally greater than fusing point of crystalline high polymer) can form homogeneous phase solution at elevated temperature, reduces
Decline due to solvability after temperature and the induction of polymer crystallization factor produces liquid-liquid (L-L) or solid-liquid (S-L) phase
Separating, then remove diluent with extractant, mixture Central Plains diluent is taken up space and is become hole, finally
Form coherent microcellular structure.TIPS method only has heat exchanging process, without regard to complicated mass exchange mistake
Journey, therefore has the advantages such as simple to operate, influence factor is few, membrane porosity is high simultaneously, be not easily formed defect,
Good mechanical property, pore size, distribution, controlled porosity.
Summary of the invention
It is an object of the invention to overcome the weak point in above-mentioned background technology, it is provided that a kind of by Thermal inactive
Hole creating technology combines with melt blown technology, it is achieved the method that porous fibre non-woven fabrics is prepared on a large scale；To promote
Existing non-woven cloth products performance so that it is meet high accuracy and high-performance filtration requirement.
The technical solution adopted in the present invention is: a kind of porous fibre non-woven fabrics preparation method, successively by following
Step is carried out:
(1) by polymer and diluent mix homogeneously, obtaining polymer quality percent concentration is 10～60%
Blend；
(2) screw extruder pelletizer is used to be melt extruded by the blend in step 1, and the coldest
But pelletize；
(3) the master batch melt-blowing equipment production in step 2 is obtained nascent non-woven fabrics；
(4) extraction removing step 3 is come into being the diluent in non-woven fabrics, makes the fiber pore-forming in this non-woven fabrics, dry
Porous fibre non-woven fabrics is i.e. obtained after dry；
(5) diluent and extractant mixed waste liquor are reclaimed, reuse.
Polymer used in the present invention requires that fibre-forming performance is more excellent, and has and diluent high-temperature digestion, low
The characteristic of temperature split-phase.Owing to the diluent range of choice is quite varied, be thus suitable for porous fibre of the present invention without
The polymer spinning cloth preparation method is the most, for polypropylene, Kynoar, polyethylene, polyester, gathers
Styrene, polyurethane, polyamide, polytrifluorochloroethylene, ethylene-acrylic acid copolymer, polyphenylene sulfide, poly-
Formaldehyde, poly-(4-methyl-1-pentene), polyether-ether-ketone, polyether sulfone, polyacrylonitrile, polysulfones, polyimides,
Polymethyl methacrylate, ethylene-vinyl alcohol copolymer, polyvinyl butyral, polylactic acid, cellulose acetate,
At least one in polrvinyl chloride, vinylidene fluoride-hexafluoropropylene copolymer.In the present invention, polymer is at mixture
In mass percent concentration be 10～60%: excessive concentration, then occur gelation phase process, it is impossible to pore-forming；
Concentration is too low, then fibrous fracture in spinning process, it is impossible to forms fiber and piles up nonwoven fabric construct, and is pearl
Shape fiber or little granule pile up form.
Diluent used in the present invention is that boiling point and can not dissolve described polymerization more than 150 DEG C at normal temperatures
The liquid or solid of thing, specially Polyethylene Glycol (200,400 and 600), higher alcohols, polyalcohols,
Phthalate, glyceric acid esters, benzoates, phosphoric acid ester, organic carbonate esters, Fructus Citri Limoniae
Esters of gallic acid, higher aliphatic esters, butyrolactone, benzophenone, polymine, benzophenone, aromatic hydrocarbon,
Mineral oil, liquid paraffin, tetramethyl sulfone, maleic anhydride, hard paraffin, crude vegetal, higher alkane,
Higher fatty acids, high fatty amine, calcium stearate, 2-aminopropane. alcohol, dimethyl sulfone, diphenyl sulphone (DPS), diphenyl ether,
One in benzaldehyde, or the mixing of two or more arbitrary proportion.
Polymer and the mixed method being used in mixed way routine of diluent, including using mixer such as Henschel
Blender, V-Mixer, ribbon mixer, stirring-type mixer, high-speed mixer etc., can be by polymer
The preliminary mix homogeneously of/diluent, walks pelletize under being beneficial to.
Screw extruder pelletizer draw ratio 20～60, compression ratio 3～6, screw speed 200～600rpm, squeezes
Going out temperature 170～250 DEG C, extruded velocity 50～300kg/h, in atmosphere direct cooling granulation, according to reality
Border situation selects technological parameter, the melt-blown master batch being uniformly mixed.
Melt-blowing equipment used in the present invention is conventional overall complete production unit, and spinning technology parameter is slit
Formula shower nozzle, spinning nozzle diameter 0.2～0.85mm, air drain angle 30 °～60 °, slit width 0.35～0.65mm,
Die temperature 150～230 DEG C, hot air temperature 180～260 DEG C, gas pressure 0.05～0.5Mpa, connect
Receive distance 8～30cm, spinning speed 25～150kg/h, select technological parameter according to practical situation, obtain
Diluent mass percent concentration is the nascent non-woven fabrics of 40%～90%.
The diluent in nascent non-woven fabrics is removed thus pore-forming, extraction on fiber in this non-woven fabrics with extractant
The process that takes uses conventional immersion processes to realize, it is possible to according to relevant document (such as Chinese patent 01144479.7；
Chinese patent 200410020242.3, Chinese patent 200510086337.X, Chinese patent
200610113814.1) realization of described method.Extract after being dried (conventional heating drying process), i.e.
Obtaining porous fibre non-woven fabrics, perforated nonwoven fabrics fabric width is 0.6～3.2m, and grammes per square metre scope is 10～75g/m2,
Average fibre diameter is 500nm～15 μm, and non-woven fabrics porosity is 50%～80%, and single fiber porosity is
40%～90%, the size distribution ranges of fiber mesopore is 100nm～1.2 μm.
Extractant used in the present invention be can dissolved dilution agent and the liquid of polymer can not be dissolved, be specially
Water, ethanol, acetone, isopropanol, ethylene glycol, glycerol, normal hexane, gasoline, dichloromethane, chloroform,
One in butanone, ethyl acetate, butanol, methanol, petroleum ether, or two or more arbitrary proportion is mixed
Close.Owing to extractant boiling point is less than diluent, thus the characteristic that both boiling point differences available are bigger, to dilute
Release agent and extractant mixed waste liquor uses conventional distil-lation or decompression distillation mode to be separately recovered recycling, with fall
Low cost.
The waste gas produced for production process, the present invention is absorbed by spray column or at waste gas absorption-combustion system
Reason, it is achieved safety, green production.
The porous fibre non-woven fabrics preparation method that the present invention relates to, it is possible to be applied in other spinning technique:
As first porous fibre prepared in polymer/diluent master batch melt extrusion spinning, then by handss such as spunbond, acupunctures
Section is prepared as porous fibre non-woven fabrics；Utilize high temperature electrostatic spining technology, can prepare few in laboratory scope
Amount porous fibre non-woven fabrics sample.
The porous fibre non-woven fabrics preparation method that the present invention relates to, it is possible in the shower nozzle in melt-blowing equipment is changed into
Footpath is 0.1～0.4mm, and external diameter is the Coaxial nozzle of 0.24～0.80mm, also leads to high velocity, hot air inside shower nozzle,
Rotating speed is that the high speed rotary-drum of 1000～2500rpm is as collection device, so that it may prepare internal diameter be 300nm～
8 μm, external diameter is 500nm～the ultra-fine hollow-fibre membrane of 15 μm.With existing diameter hollow more than 100 μm
Fibrous membrane is compared, and can be greatly improved wastewater treatment efficiency.
The invention has the beneficial effects as follows:
1) diluent is also the plasticizer in polymer processing, and the addition of Macrodilution agent can make polymer
Melt viscosity is substantially reduced, and is beneficial to extrusion and reduces melt-blown fiber diameters, it is possible to being substantially reduced in production process
Die head and hot air temperature, energy consumption is little and slows down depolymerization；In addition the method only need to use typical polymerization
Thing master batch rather than melt-blown special master batch, can reduce raw material use cost.
2) in porous fibre non-woven fabrics, single fiber porosity is the highest is 90%, i.e. non-woven fabrics grammes per square metre is only
Original 10%, consumption of raw materials amount can be greatly reduced.
3) introducing of loose structure, adds non-woven fabrics specific surface area, thus be greatly promoted its process at water,
Application performance in field of air filtration.
Accompanying drawing explanation
A figure and b figure in Fig. 1 are that polypropylene porous fibre surface prepared in embodiment 1 is with disconnected respectively
The scanning electron microscope (SEM) photograph in face.
A figure and b figure in Fig. 2 are that polypropylene porous fibre surface prepared in embodiment 2 is with disconnected respectively
The scanning electron microscope (SEM) photograph in face.
A figure and b figure in Fig. 3 are that polypropylene porous fibre surface prepared in embodiment 3 is with disconnected respectively
The scanning electron microscope (SEM) photograph in face.
A figure and b figure in Fig. 4 are Kynoar porous fibre surface prepared in embodiment 4 respectively
Scanning electron microscope (SEM) photograph with section.
Fig. 5 is the scanning electron microscope (SEM) photograph of polypropylene superfine doughnut section prepared in embodiment 5.
Detailed description of the invention
Separated for cause hole creating technology is combined with melt blown technology and prepares porous fibre non-woven fabrics by the present invention, is suitable for
The polymer of the method, diluent and solvent selection are the most extensive, different polymer/diluent/extractions
The permutation and combination of agent can obtain very many process conditions, but ultimate principle is constant, and available difference is poly-
Compound kind, fabric width and grammes per square metre, fibre diameter, fiber porosity, fiber pore-size distribution porous fibre without
Spin cloth.The whole technological process of production includes mixing-extruding pelletization-melt-blown-extraction-dry-diluent/extractant
Reclaim, below in conjunction with Figure of description, the invention will be further described, but the invention is not limited in
Lower embodiment.
Embodiment 1 polypropylene/liquid paraffin solid-liquid phase separation system
Polymer raw material is that Qilu Petrochemical produces polypropylene T30S, and diluent is liquid paraffin, and extractant is just own
Alkane.Polypropylene mass percent concentration is 30%, first by mixed by high speed at normal temperatures to polypropylene and liquid paraffin
Conjunction machine is blended uniformly.Then screw extruder pelletize is used, screw extruder pelletizer draw ratio 42, compression ratio 3,
Screw speed 400rpm, extrusion temperature 180 DEG C, extruded velocity 150kg/h, cooling obtains in atmosphere
The melt-blown master batch of polypropylene/liquid paraffin.Master batch is carried out melt-blown production, and technological parameter is slit shower nozzle, spray
Silk mouth diameter 0.42mm, air drain angle 30 °, slit width 0.62mm, die temperature 185 DEG C, hot-air
Temperature 200 DEG C, gas pressure 0.1Mpa, receiving range 15cm, spinning speed 100kg/h, nascent nonwoven
Cloth grammes per square metre is 100g/m2, fabric width is 1.6m, and nonwoven collection speed is 10.4m/min.Nascent non-woven fabrics
By conventional impregnating production-line equipment, use normal hexane to impregnate extraction liquids paraffin continuously, be dried to obtain poly-third
Alkene porous fibre non-woven fabrics.Porous fibre non-woven fabrics is quenched disconnected under liquid nitrogen, observes fibre with scanning electron microscope respectively
Dimension table face and cross-section morphology, as shown in Figure 1.Porous fibre non-woven fabrics grammes per square metre is 30g/m2, fiber is the most straight
Footpath is 10 μm, and non-woven fabrics porosity is 60%, and single fiber porosity is 70%, and the size of fiber mesopore is divided
Cloth scope is 300nm～1.2 μm.This system only occurs solid-liquid (S-L) to be separated, and S-L phase separation temperature is
120 DEG C, therefore fiber surface forms dense layer surface structure, and fiber cross-sectional is cell shape pore structure.Normal hexane and
Liquid paraffin mixed waste liquor collects normal hexane steam in 80 DEG C of air-distillations, condensation, and liquid paraffin stays bottom,
It is separately recovered and recycles.
Embodiment 2 polypropylene/n-butyl phthalate/phthalic acid n-octyl liquid-liquid phase separation system
Polymer raw material is that Yanshan Petrochemical produces polypropylene S1003, and diluent is phthalic acid n-octyl and adjacent benzene
Dioctyl phthalate N-butyl mixture, extractant is isopropanol.Polypropylene mass percent concentration is 20%, adjacent benzene two
Formic acid n-octyl mass percent concentration is 64%, and n-butyl phthalate mass percent concentration is 16%.
First polypropylene, phthalic acid n-octyl and n-butyl phthalate are used high-speed mixer at normal temperatures
It is blended uniformly.Then screw extruder pelletize, screw extruder pelletizer draw ratio 20, compression ratio 4, spiral shell are used
Bar rotating speed 600rpm, extrusion temperature 200 DEG C, extruded velocity 300kg/h, cooling is gathered in atmosphere
Propylene/phthalic acid n-octyl/melt-blown master batch of n-butyl phthalate.Master batch is carried out melt-blown production,
Technological parameter is slit shower nozzle, spinning nozzle diameter 0.60mm, air drain angle 40 °, slit width 0.65mm,
Die temperature 200 DEG C, hot air temperature 220 DEG C, gas pressure 0.25Mpa, receiving range 20cm, spin
Silk speed 200kg/h, nascent non-woven fabrics grammes per square metre is 200g/m2, fabric width is 3.2m, nonwoven collection speed
For 5.2m/min.Nascent non-woven fabrics, by conventional impregnating production-line equipment, uses isopropanol to impregnate extraction continuously
Phthalic acid n-octyl and n-butyl phthalate, be dried to obtain polypropylene porous fibre non-woven fabrics.Will
Porous fibre non-woven fabrics is quenched disconnected under liquid nitrogen, observes fiber surface and cross-section morphology respectively with scanning electron microscope, as
Shown in Fig. 2.Porous fibre non-woven fabrics grammes per square metre is 40g/m2, average fibre diameter is 8 μm, non-woven fabrics hole
Rate is 75%, and single fiber porosity is 80%, and the size distribution ranges of fiber mesopore is 300nm～850nm.
This system generation liquid-liquid (L-L) is separated, but L-L phase separation temperature (127 DEG C) and S-L phase separation temperature
(113 DEG C) are close, and therefore fiber surface forms round hole, and fiber cross-sectional is co-continuous pore structure.Isopropyl
Alcohol, phthalic acid n-octyl and n-butyl phthalate mixed waste liquor are in 120 DEG C of air-distillations, condensation
Collecting IPA vapor, phthalic acid n-octyl and n-butyl phthalate stay bottom, are separately recovered
Recycle.
Embodiment 3 polypropylene/diphenyl ether liquid-liquid phase separation system
Identical with embodiment 1 basic technological parameters, diluent selects diphenyl ether, fiber surface and cross-section morphology
As it is shown on figure 3, the size distribution ranges of fiber mesopore is 300nm～650nm.Only there is liquid-liquid in this system
(L-L) being separated, L-L phase separation temperature is 135 DEG C, and therefore fiber surface forms oval aperture, fiber
Section is co-continuous pore structure.
Embodiment 4 Kynoar/n-butyl phthalate solid-liquid phase separation system
Polymer raw material is that Su Wei produces Kynoar 6010, and diluent is n-butyl phthalate, extraction
Agent is ethanol.Kynoar mass percent concentration is 25%, first by Kynoar and phthalic acid
N-butyl is blended uniformly with high-speed mixer at normal temperatures, then pelletize；Screw extruder pelletizer draw ratio 35,
Compression ratio 3.5, screw speed 300rpm, extrusion temperature 220 DEG C, extruded velocity 80kg/h, at air
Middle cooling obtains the melt-blown master batch of Kynoar/n-butyl phthalate.Master batch is carried out melt-blown production, work
Skill parameter is slit shower nozzle, spinning nozzle diameter 0.55mm, air drain angle 35 °, slit width 0.48mm,
Die temperature 220 DEG C, hot air temperature 240 DEG C, gas pressure 0.35Mpa, receiving range 30cm, spin
Silk speed 60kg/h, nascent non-woven fabrics grammes per square metre is 80g/m2, fabric width is 1.6m, and nonwoven collection speed is
7.8m/min.The nascent non-woven fabrics collected impregnates 2h, 1h and 30min successively in 3 ethanol grooves, uses
In extraction (batch (-type) dipping extraction) n-butyl phthalate, it is dried to obtain Kynoar porous fibre
Non-woven fabrics.Porous fibre non-woven fabrics is quenched disconnected under liquid nitrogen, observes fiber surface with scanning electron microscope respectively and break
Face pattern, as shown in Figure 4.Porous fibre non-woven fabrics grammes per square metre is 20g/m2, average fibre diameter is 12 μm,
Non-woven fabrics porosity is 80%, and single fiber porosity is 75%, and the size distribution ranges of fiber mesopore is 300
Nm～550nm.This system only occurs solid-liquid (S-L) to be separated, and S-L phase separation temperature is 138 DEG C, poly-inclined
Fluorothene forms spherocrystal packed structures, and therefore fiber surface is borehole structure, and fiber cross-sectional is that spherocrystal is piled up
Alveolate texture.Ethanol and n-butyl phthalate mixed waste liquor are collected in 100 DEG C of air-distillations, condensation
Alcohol vapour, n-butyl phthalate is stayed bottom, is separately recovered and recycles.
Embodiment 5 polypropylene/liquid paraffin solid-liquid phase separation system
Basic technological parameters is same with embodiment 1, and melt-blowing equipment uses Coaxial nozzle instead, and spinning nozzle internal diameter is 0.25mm,
External diameter is 0.42mm, with the high speed rotary-drum that rotating speed is 1600rpm as collection device.Quench under liquid nitrogen disconnected,
With scanning electron microscopic observation hollow-fibre membrane cross-section morphology, as it is shown in figure 5, preparing internal diameter is 7.5 μm,
External diameter is the ultra-fine hollow-fibre membrane of 10 μm, and remaining character is same with embodiment 1.
Above-described embodiment only for technology design and the feature of the present invention are described, its objective is to allow and is familiar with this technology neck
The technical staff in territory will appreciate that present disclosure and implements according to this, can not limit the present invention's with this
Protection domain.Any those skilled in the art are in the range of without departing from technical solution of the present invention, when can
The technology contents utilizing the disclosure above is made a little change or is modified to the Equivalent embodiments of equivalent variations, as long as
It is the content without departing from technical solution of the present invention, according to the technical spirit of the present invention, above example is made
Any simple modification, equivalent variations and modification, all should contain within protection scope of the present invention.
Claims (3)
1. a porous fibre non-woven fabrics preparation method, sequentially includes the following steps: successively
(1) by polymer and diluent mix homogeneously, obtaining polymer quality percent concentration is 10～60%
Blend；
(2) screw extruder pelletizer is used to be melt extruded by the blend in step 1, and the coldest
But pelletize；
(3) the master batch melt-blowing equipment production in step 2 is obtained nascent non-woven fabrics；
(4) extraction removing step 3 is come into being the diluent in non-woven fabrics, makes the fiber pore-forming in this non-woven fabrics, dry
Porous fibre non-woven fabrics is i.e. obtained after dry；
(5) diluent and extractant mixed waste liquor are reclaimed, reuse；
Described polymer be polypropylene, Kynoar, polyethylene, polyester, polystyrene, polyurethane,
Polyamide, polytrifluorochloroethylene, ethylene-acrylic acid copolymer, polyphenylene sulfide, polyformaldehyde, poly-(4-methyl
-1-amylene), polyether-ether-ketone, polyether sulfone, polyacrylonitrile, polysulfones, polyimides, poly-methyl methacrylate
Ester, ethylene-vinyl alcohol copolymer, polyvinyl butyral, polylactic acid, cellulose acetate, polrvinyl chloride, partially
At least one in viton copolymers；
Described diluent is higher alcohols, polyalcohols, phthalate, glyceric acid esters, benzene first
Esters of gallic acid, phosphoric acid ester, organic carbonate esters, citric acid ester type, higher aliphatic esters, butyrolactone, two
Benzophenone, polymine, benzophenone, aromatic hydrocarbon, mineral oil, liquid paraffin, tetramethyl sulfone, Malaysia
Acid anhydride, hard paraffin, crude vegetal, higher alkane, higher fatty acids, high fatty amine, calcium stearate,
One in 2-aminopropane. alcohol, dimethyl sulfone, diphenyl sulphone (DPS), diphenyl ether, benzaldehyde, or two or more arbitrarily
The mixing of ratio；
In described step (4) extraction use extractant be water, ethanol, acetone, isopropanol, ethylene glycol,
Glycerol, normal hexane, gasoline, dichloromethane, chloroform, butanone, ethyl acetate, butanol, methanol, oil
One in ether, or the mixing of two or more arbitrary proportion；
The mixer that mixing in step (1) is used is Henschel blender, ribbon mixer, stirring
At least one in formula mixer；
The draw ratio 20～60 of described screw extruder pelletizer, compression ratio 3～6, screw speed 200～600rpm,
Extrusion temperature 170～250 DEG C, extruded velocity 50～300kg/h；
Melt-blowing equipment employing slit shower nozzle, its spinning nozzle diameter 0.2～0.85mm, air drain angle 30 °～60 °,
Slit width 0.35～0.65mm, die temperature 150～230 DEG C, hot air temperature 180～260 DEG C, gas
Body pressure 0.05～0.5Mpa, receiving range 8～30cm, spinning speed 25～150kg/h.
The preparation method of porous fibre non-woven fabrics the most according to claim 1, it is characterised in that diluent
With the recovery of extractant mixed waste liquor, use conventional distil-lation or decompression distillation mode.
The preparation method of porous fibre non-woven fabrics the most according to claim 2, it is characterised in that melt-blown set
Standby employing internal diameter is 0.1～0.4mm, and external diameter is the Coaxial nozzle of 0.24～0.80mm, also logical high inside shower nozzle
Speed hot-air；Rotating speed be the high speed rotary-drum of 1000～2500rpm as collection device, preparing internal diameter be
300nm～8 μm, external diameter is 500nm～the ultra-fine hollow-fibre membrane of 15 μm.
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| WO2018160284A3 (en) * | 2017-02-28 | 2018-10-04 | Kimberly-Clark Worldwide, Inc. | Techinque for forming porous fibers |
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