CN102041567A - Method for preparing viscose fibers through ultrasonic depolymerization of bamboo and wood composite pulp - Google Patents
Method for preparing viscose fibers through ultrasonic depolymerization of bamboo and wood composite pulp Download PDFInfo
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Abstract
The invention provides a method for preparing viscose fibers through ultrasonic depolymerization of bamboo and wood composite pulp, which is a method for producing the viscose fibers from bamboo and wood mixed slurry through depolymerization in an ultrasonic depolymerization tube. In the method, a traditional reaction kettle is replaced by the ultrasonic depolymerization tube, and the method comprises the following steps of: performing alkali steeping on the bamboo and wood pulp to obtain slurry; depolymerizing the slurry under the action of an ultrasonoscope; and pressing to obtain alkaline fibers, and finally preparing the viscose fibers from the alkaline fibers. The method overcomes the defects in the prior art, the depolymerization is more uniform, the energy consumption is low, a few pieces of equipment are used, the occupied space is small and the product quality is stable. Moreover, the ultrasonic polymer depolymerization is applied to the production of the viscose fibers for the first time, and a depolymerization method for the production of the viscose fibers through depolymerization is increased.
Description
Technical field
The invention belongs to viscose and make the field, relate to the method for making viscose with the compound pulp of bamboo wood, poly-method is made fine viscose with the compound pulp of bamboo wood method falls in using ultrasound specifically.
Technical background
It is cellulosic that to fall poly-(the reduction degree of polymerization) be indispensable processing step in viscose glue is produced, having only the production requirement that to a certain degree could satisfy follow-up viscose that is reduced to plant cellulose, is that poly-key falls in cellulose and fall poly-uniformity therein and fall poly-degree.
Poly-method falls in preparation viscose glue cellulosic to be had: aerobic falls poly-and alkali falls poly-.Fall poly-ly in the practice based on aerobic, and that poly-temperature requirement falls in alkali is higher relatively and bigger to the infringement of cellulose primary characteristic, therefore less use.
200810044654.9 it is poly-that the patent documentations such as degrading and polymerizing technology of the method for the production method of the method for preparing dissolved pulp by oxidative degradation of linters, 200810044655.3 dissolving pulp by oxygen continuous digesting method, 200810044656.8 preparing dissolved pulp by oxidative decomposition of paper pulp, a 20081004452.x string all are that aerobic falls.
20081004452.x: a kind of degrading and polymerizing technology of string, having adopted with the papermaking level pulpboard is raw material, can be used for the dissolving grade plant pulp that viscose is produced by falling poly-producing at last in slurrying, the reactor.The dissolving grade plant pulp that obtains can be directly used in viscose production.The essence of the disclosed technical scheme of this application for a patent for invention is to be used for the papermaking level string pulpboard that viscose is produced, by gathering the dissolving grade pulp by the high temperature drop of aerobic at reactor, the treated mistake of raw material is directly used in conventional cellulose viscose manufacturing technique and obtains viscose.Conventional cellulose viscose manufacturing technique comprises dipping, it is experienced to squeeze, yellow, filtration, deaeration, spinning, refining, oven dry.
Though above-mentioned prior art has effectively utilized the cheap advantage of papermaking level plant pulpboard to produce the dissolving grade pulp of viscose production usefulness, but also make viscose produce the production of one-part form production becoming two-part, being fallen in pulpboard dipping acquisition slurry congee again, poly-squeezing obtains the alkali fibre earlier, carry out fiber production again, 20081004452.x technology still belongs to the pulp denatured technology, to flood as papermaking level string pulpboard earlier, carrying out the high pressure aerobic then in reactor falls poly-, fall the squeezing of poly-back and obtain the alkali fibre, then just with the fine viscose of producing of alkali, though the sex change of pulp is connected mutually with viscose production, but because it falls collecting process and carries out in the reactor of high temperature aerobic, make to there is many drawbacks, these drawbacks also are that poly-common problem falls in aerobic, mainly comprise:
One, fall poly-inhomogeneous: because the reactor volume is big, to stir the dead angle many, cause stirring uneven; And slurry congee participation reaction can not be evenly infiltrated in the adding of oxygen, finally causes falling poly-uneven;
Two, the reactor floor space is big, and needs compressed air and hot environment, makes that whole cellulose viscose manufacturing technique process becomes huge, consuming time, equipment is many, to take up an area of plant area big, is not easy to production management;
Three, reactor need of work compressed air and steam, energy consumption is big.
Four, being reflected under high temperature, aerobic, the stirring condition in the reactor, technology controlling and process point is many, the control difficulty is big, causes unstable product quality.
Summary of the invention
The purpose of this invention is to provide a kind of directly with the compound pulp of bamboo wood by ultrasonic a kind of viscose production method of falling poly-Guan Jiangju, this method is fallen poly-pipe and has been replaced traditional reactor with ultrasonic, falling of having overcome that above-mentioned prior art exists is poly-inhomogeneous, energy consumption is big, equipment is many, take up an area of the space greatly, the drawback of unstable product quality.
The ultrasonic production method of falling poly-manufacturing viscose of the compound pulp of bamboo wood is characterized in that step is as follows:
A. bamboo pulp, wood pulps obtain compound slurry congee through alkali steeping;
B. starch congee in leading to the squeezer process, under the ultrasonoscope effect, finish fall poly-, hyperacoustic power 1.0KW～3.5KW, frequency of ultrasonic 20～60KHz;
C. fall the squeezing of poly-back and obtain compound alkali fibre;
D. with the fine viscose of producing of compound alkali.
Fall poly-principle and be ultrasonic/sonic wave to high molecular degradation, macromolecule degradable under the ultrasonic wave effect is a monomer, and cellulose (glycan) reaches at ultrasonotomography that degradable is a monose under certain hour and the intensity here.
Ultrasonoscope in the described B operation can adopt the aufbauprinciple of prior art, mainly constitute by excusing from death generation mechanism and ultrasound emission mechanism, existing ultrasonoscope has all kinds, the present invention does not repel any, key is ultrasound emission mechanism in the ultrasonoscope, it is arranged on slurry congee pipeline outside, slurry congee in leading to the squeezer process, finish fall poly-.A kind of existing ultrasonoscope, it is ultrasonic generator, output transformer, impedor etc. that excusing from death produces mechanism, ultrasound emission mechanism is ultrasonic transducer, resonance thin slice.The present invention also can adopt other versions, all is prior art.
Described ultrasound emission mechanism (such as on transducer and resonance thin slice) can be strip, be distributed in slurry congee pipeline outside at interval, symmetrically.Can be cannula-like, be coated on slurry congee pipeline outside.Can be a watt shape, two or multi-disc be arranged symmetrically on the slurry congee pipeline.Ultrasound emission mechanism (ultrasonic transducer and resonance thin slice) or and the slurry congee pipeline that covers be called the ultrasonic poly-pipe that falls in the present invention.
Adopt above ultrasonoscope to fall poly-operation principle to be: at first output transformer and impedor carry out the impedance conversion to ultrasonic transducer or ultrasonic generator, the impedance of ultrasonic transducer and the load of ultrasonic generator are complementary, purpose is to make ultrasonic transducer can accept characteristic frequency signal that supersonic generator sends and adjust power output by the output transformer coil, ultrasonic generator is converted into direct current to alternating current, drive the oscillator signal that inner HF signal generator produces a CF, then the signal of this CF input ultrasonic transducer, cause the mechanical oscillation of resonance thin slice, just can produce the ultrasonic wave of this CF, by control circuit system control output frequency, by output voltage transformer control power output, can also allow slurry congee fall the poly-time controlling by control slurry congee flow velocity and by pump, thereby poly-degree fall in control by ultrasonic circulation.
Described B operation slurry congee flow velocity is 10～30m
3/ hour, duct length is 3m～20m.
The slurry congee of described B operation is 50 ℃～90 ℃ by ultrasonic temperature when falling poly-pipe, ultrasonicly falls poly-internal diameter of the pipeline 60cm～90cm, and slurry congee concentration is 1.9%～4.1% (mass percent).
Described A operation is finished alkali liquid temperature in treating tank: 60 ℃～90 ℃, alkali concn 50g/l～120g/l, slurry congee concentration 1.9%～4.1%, dip time: 40min～70min, effect is: form alkali cellulose, and impurity such as stripping lignin.The compound of bamboo pulp and wood pulps can be compound when alkali steeping, and it is compound again after the congee also can to make slurry respectively.
Described A operation can add auxiliary agent: methyl isopropyl ketone (MIBK)-ethanol bonding solvent, wherein MIBK: ethanol=1-3: 1 (volume ratio) when adding alkali lye.
Described C operation adopts squeezer that slurry congee is squeezed, it is 60 ℃～80 ℃ that pressing temperature requires, squeeze pressure 300mbar～700mbar, the fine content 26%～41% (mass percent) of the first of the alkali fibre after the squeezing, alkali fiber content: 14%～17% (mass percent), fine viscosity: the 9mPa.s～13mPa.s of alkali.
The viscose production process of described D operation comprises the squeezing yellow, obtains viscose glue, and viscose glue obtains viscose, final purification through filtration, deaeration, spinning.
Beneficial effect of the present invention shows:
One, because the ultrasonic wave penetrability is strong, add with tube shaped and be wrapped in slurry congee pipe circumference outside, therefore avoided falling the generation at poly-dead angle;
Two, poly-owing to adopting ultrasonic wave to fall, do not need steam and oxygen to participate in reaction, stopped the uneven drawback of reaction;
Three, to fall poly-pipe be to be coated on slurry congee pipe arrives to the ultrasonic wave that adopts of the present invention, and it is little to take up room; And, reduced number of devices owing to need not to dispose the equipment that send oxygen and steam again, reduce energy consumption, and made things convenient for production management;
Four, owing to fall poly-no longer need high temperature, aerobic, stirring condition reaction down, reduce loaded down with trivial details technology controlling and process point, greatly reduced the control difficulty, guaranteed the stable of product quality.
Five, in the viscose industry, poly-to falling of slurry congee all is that to adopt the boiling mode to fall poly-, and the aerobic that provides as background technology falls poly-and alkali falls poly-ly, and they all have a common ground---boiling, no matter are that textbook or industrial circle all are to adopt identical theory.The present invention is applied to ultrasonic wave in the middle of viscose produces to the poly-effect of falling of polymer first, has enriched viscose and has fallen poly-method in the middle of falling poly-production.
The present invention has jumped out traditional cellulose and has fallen poly-theoretical, that innovates adopts ultrasonic wave to fall poly-to cellulose in the viscose glue production industry, having changed traditional cellulose and fallen poly-mode, is a kind of new theory study and trial, and has realized comprising above some beyond thought technique effect.
Description of drawings
Fig. 1 obtains flow sheet before the alkali fibre for the present invention
Fig. 2 gathers the tubular construction schematic diagram for ultrasonic the falling that the present invention adopts
Fig. 3 gathers the instrument structure principle chart for ultrasonic the falling that the present invention adopts
Mark among the figure: 1 feeds dregs of rice machine, 2 treating tanks, 3 assistant soakage buckets, 4 slurry congee pipelines, 5 squeezers, 6 ultrasonic poly-pipe (ultrasound emission mechanism), 7 rectifiers, 8 HF signal generators (7,8 belong to ultrasonic generator), 9 impedors and output transformer, 10 ultrasonic transducers, the 11 resonance thin slices of falling
Specific embodiments
This patent discloses the compound pulp of bamboo wood has been directly applied to viscose, mainly comprises alkali steeping, assistant soakage, the ultrasonic operations such as poly-Guan Jiangju, squeezing of falling.Step comprises:
Bamboo pulp, wood pulps obtain compound slurry congee through alkali steeping;
Slurry congee in leading to the squeezer process, ultrasonic fall to finish under the poly-pipe effect fall poly-ly, the characteristics according to the compound pulp of bamboo wood are provided with hyperacoustic power 1.0KW～3.5KW, frequency of ultrasonic 20～60KHz is advisable;
Fall the squeezing of poly-back and obtain compound alkali fibre;
With the fine viscose that generates of compound alkali.
Embodiment is as follows:
Embodiment 1
Concrete processing step is as follows:
One, average degree of polymerization is placed on greater than 1000 bamboo pulp and wood pulps feeds on the dregs of rice machine, set certain rate of feeding (25kg/min), add concentration 85g/l again, temperature is 60 ℃～90 ℃ a alkali lye, and flux of alkaline liquor is 10m
3/ h～20m
3, pass through stirring action then, pulp is smashed with alkali lye fully mixed, be mixed with solid-state and liquid mixture, be referred to as compound slurry congee, claim this operation to be dipping on the technology.
Effect: make bamboo pulp, wood pulps raw material become solid and liquid mixture, the β-Xian Weisu of stripping simultaneously improves alpha fibre content, produces alkali cellulose.
Control parameter: alkali liquid temperature: 75 ± 15 ℃ of concentration of lye: 85g/l
Compound slurry congee concentration: 3.5 ± 2% (mass percent) dip time: 30 ± 20min
Perhaps, above wood pulps and bamboo pulp carry out alkali steeping (immersion condition is basic identical) respectively, make wood pulp congee and bamboo pulp congee, are mixed into compound slurry congee then.
Two, by pump the slurry congee of assistant soakage bucket is beaten toward squeezer and is squeezed, under ultrasonication, finish simultaneously fall poly-.
Effect: continue to generate compound alkali cellulose and impurity such as stripping hemicellulose, lignin, finish simultaneously and fall poly-operation, improve the reactivity worth of alkali cellulose.
Control parameter: compound slurry congee flow velocity: 10m
3/ h ultrasonic power: 2.5KW
Duct length is: 10m supersonic frequency: 20KHz
Three, the compound slurry congee that will fall after gathering squeezes with squeezer, and the material that squeezes out is divided into two parts, and a part is being mingled with small part alkali lye, and another part is solid and the mixtures of liquids that has extruded excessive moisture, is called compound alkali fibre on the technology.Precomminution and fine powder by the squeezer outlet are broken, enter the yellow system then and carry out yellow, and deaeration, spinning etc. obtain viscose, final purification then.
Effect: separate alkali cellulose and alkali lye.
Control parameter: pressing temperature: 60 ± 3 ℃ of squeeze pressure: 500 ± 50mbar
The fine content of the fine first of compound alkali: the fine alkali content of 30 ± 1% compound alkali: 16 ± 1%
Fine viscosity: the 9 ± 1mP.s of compound alkali
Four, satisfactory compound alkali fibre enters the viscose production system.Viscose comprises short silk and long filament, and the production process of viscose can adopt common process, as dipping, squeezing, experienced, yellow, obtains viscose glue, and viscose glue obtains viscose, final purification through filtration, deaeration, spinning.
Embodiment 2
Concrete processing step is as follows:
One, average degree of polymerization is placed on greater than 800 bamboo pulp, wood pulps feeds on the dregs of rice machine, set certain rate of feeding (25kg/min), add concentration 80g/l again, temperature is 60 ℃～90 ℃ a alkali lye, and flux of alkaline liquor is 10m
3/ h～20m
3, its objective is the stripping of quickening lignin and impurity in the bamboo pulp.Pass through stirring action then, pulp is smashed with alkali lye fully mixed, be mixed with solid-state and liquid mixture, be referred to as compound slurry congee, claim this operation to be dipping on the technology.
Effect: make bamboo pulp, wood pulps raw material become solid and liquid mixture, be called dipping on the technology, the β-Xian Weisu of stripping simultaneously improves alpha fibre content, produces alkali cellulose.
Control parameter: alkali liquid temperature: 75 ± 15 ℃ of concentration of lye: 80g/l
Compound slurry congee concentration: 3.5 ± 2% (mass percent) dip time: 30 ± 20min
Perhaps, above wood pulps and bamboo pulp carry out alkali steeping (immersion condition is basic identical) respectively, make wood pulp congee and bamboo pulp congee, are mixed into compound slurry congee then.
Two, by pump the slurry congee of assistant soakage bucket is beaten toward squeezer and is squeezed, under ultrasonication, finish simultaneously fall poly-.
Effect: continue to generate compound alkali cellulose and impurity such as stripping hemicellulose, lignin, finish simultaneously and fall poly-operation, improve the reactivity worth of alkali cellulose.
Control parameter: compound slurry congee flow velocity: 30m
3/ h ultrasonic power: 1.0KW
Duct length is: 7m supersonic frequency: 60KHz
Three, the compound slurry congee that will fall after gathering squeezes with squeezer, and the material that squeezes out is divided into two parts, and a part is being mingled with small part alkali lye, and another part is solid and the mixtures of liquids that has extruded excessive moisture, is called the alkali fibre on the technology.Precomminution and fine powder by the squeezer outlet are broken, enter the yellow system then and carry out yellow, and deaeration, spinning etc. obtain viscose, final purification then.
Effect: separate alkali cellulose and alkali lye.
Control parameter: pressing temperature: 60 ± 3 ℃ of squeeze pressure: 500 ± 50mbar
The fine content of the fine first of compound alkali: the fine alkali content of 28 ± 1% compound alkali: 16 ± 1%
Fine viscosity: the 9 ± 1mP.s of compound alkali
Four, satisfactory compound alkali fibre enters the viscose production system.Viscose comprises short silk and long filament, and the production process of viscose can adopt common process, as dipping, squeezing, experienced, yellow, obtains viscose glue, and viscose glue obtains viscose, final purification through filtration, deaeration, spinning.
Embodiment 3
Concrete processing step is as follows:
One, average degree of polymerization is placed on greater than 1200 bamboo pulp, wood pulps feeds on the dregs of rice machine, set certain rate of feeding (25kg/min), add concentration 100g/l again, temperature is 60 ℃～90 ℃ a alkali lye, and flux of alkaline liquor is 10m
3/ h～20m
3, add auxiliary agent: methyl isopropyl ketone (MIBK)-ethanol bonding solvent, wherein MIBK when adding alkali lye: ethanol=80: 50 its objective is the stripping of quickening lignin and impurity in the bamboo pulp.Pass through stirring action then, pulp is smashed with alkali lye fully mixed, be mixed with solid-state and liquid mixture, be referred to as compound slurry congee, claim this operation to be dipping on the technology.
Effect: make bamboo pulp, wood pulps raw material become solid and liquid mixture, be called dipping on the technology, the β-Xian Weisu of stripping simultaneously improves alpha fibre content, produces alkali cellulose.
Control parameter: alkali liquid temperature: 75 ± 15 ℃ of concentration of lye: 100g/l
Slurry congee concentration: 3.5 ± 2% (mass percent) dip time: 30 ± 20min
Perhaps, above wood pulps and bamboo pulp carry out alkali steeping (immersion condition is basic identical) respectively, make wood pulp congee and bamboo pulp congee, are mixed into compound slurry congee then.
Two, by pump the slurry congee of assistant soakage bucket is beaten toward squeezer and is squeezed, under ultrasonication, finish simultaneously fall poly-.
Effect: continue to generate compound alkali cellulose and impurity such as stripping hemicellulose, lignin, finish simultaneously and fall poly-operation, improve the reactivity worth of alkali cellulose.
Control parameter: compound slurry congee flow velocity: 20m
3/ h ultrasonic power: 3.5KW
Duct length is: 6m supersonic frequency: 60KHz
Three, the slurry congee that will fall after gathering squeezes with squeezer, and the material that squeezes out is divided into two parts, and a part is being mingled with small part alkali lye, and another part is solid and the mixtures of liquids that has extruded excessive moisture, is called the alkali fibre on the technology.Precomminution and fine powder by the squeezer outlet are broken, enter the yellow system then and carry out yellow, and deaeration, spinning etc. obtain viscose, final purification then.
Effect: separate alkali cellulose and alkali lye.
Control parameter: pressing temperature: 60 ± 3 ℃ of squeeze pressure: 500 ± 50mbar
The fine content of the fine first of compound alkali: the fine alkali content of 32 ± 1% compound alkali: 16 ± 1%
Fine viscosity: the 9 ± 1mP.s of compound alkali
Four, satisfactory compound alkali fibre enters the viscose production system.Viscose comprises short silk and long filament, and the production process of viscose can adopt common process, as dipping, squeezing, experienced, yellow, obtains viscose glue, and viscose glue obtains viscose, final purification through filtration, deaeration, spinning.
Concrete processing step is as follows:
One, average degree of polymerization is placed on greater than 1000 bamboo pulp, wood pulps feeds on the dregs of rice machine, set certain rate of feeding (20kg/min), add concentration 95g/l again, temperature is 60 ℃～90 ℃ a alkali lye, and flux of alkaline liquor is 10m
3/ h～20m
3Pass through stirring action then, pulp is smashed with alkali lye fully mixed, be mixed with solid-state and liquid mixture, be referred to as compound slurry congee, claim this operation to be dipping on the technology.
Effect: make bamboo pulp, wood pulps raw material become solid and liquid mixture, the β-Xian Weisu of stripping simultaneously improves alpha fibre content, produces alkali cellulose.
Control parameter: alkali liquid temperature: 70 ± 15 ℃ of concentration of lye: 95g/l
Compound slurry congee concentration: 3.5 ± 2% (mass percent) dip time: 30 ± 20min
Perhaps, above wood pulps and bamboo pulp carry out alkali steeping (immersion condition is basic identical) respectively, make wood pulp congee and bamboo pulp congee, are mixed into compound slurry congee then.
Two, by pump the slurry congee of assistant soakage bucket is beaten toward squeezer and is squeezed, under ultrasonication, finish simultaneously fall poly-.
Effect: continue to generate compound alkali cellulose and impurity such as stripping hemicellulose, lignin, finish simultaneously and fall poly-operation, improve the reactivity worth of alkali cellulose.
Control parameter: compound slurry congee flow velocity: 15m
3/ h ultrasonic power: 2KW
Duct length is: 9m supersonic frequency: 45KHz
Three, the compound slurry congee that will fall after gathering squeezes with squeezer, and the material that squeezes out is divided into two parts, and a part is being mingled with small part alkali lye, and another part is solid and the mixtures of liquids that has extruded excessive moisture, is called the alkali fibre on the technology.Precomminution and fine powder by the squeezer outlet are broken, enter the yellow system then and carry out yellow, and deaeration, spinning etc. obtain viscose, final purification then.
Effect: separate alkali cellulose and alkali lye.
Control parameter: pressing temperature: 60 ± 3 ℃ of squeeze pressure: 500 ± 50mbar
The fine content of the fine first of compound alkali: the fine alkali content of 31 ± 1% compound alkali: 16 ± 1%
Fine viscosity: the 9.5 ± 1mP.s of compound alkali
Four, satisfactory compound alkali fibre enters the viscose production system.Viscose comprises short silk and long filament, and the production process of viscose can adopt common process, as dipping, squeezing, experienced, yellow, obtains viscose glue, and viscose glue obtains viscose, final purification through filtration, deaeration, spinning.
Embodiment 5: ultrasonic fall poly-
The aufbauprinciple of the used ultrasonoscope of the above embodiment of the present invention is not limited to following structure, but all from prior art, by formations such as ultrasonic generator (rectifier, HF signal generator), output transformer, impedor, ultrasonic transducer, resonance thin slices.As shown in Figure 3.
Ultrasonicly fall poly-principle and be: at first output transformer and impedor carry out the impedance conversion to ultrasonic transducer or ultrasonic generator, the impedance of ultrasonic transducer and the load of ultrasonic generator are complementary, purpose is to make ultrasonic transducer can accept characteristic frequency signal that supersonic generator sends and adjust power output by the output transformer coil, ultrasonic generator is converted into direct current to alternating current, drive the oscillator signal that internal circuit produces a CF, then the signal of this CF input ultrasonic transducer, just can produce the ultrasonic wave of this CF, by control circuit system control output frequency, by output voltage transformer control power output, fall the poly-time by the control of control slurry congee flow velocity, thereby poly-degree falls in control.
To pipeline entoplasm congee emission ultrasonic be ultrasonic transducer, ultrasonic transducer is enclosed on the slurry congee pipeline, slurry congee in leading to the squeezer process, finish fall poly-.
More than the principle of the employed ultrasonoscope of each embodiment can adopt prior art, the present invention does not limit its structure, key is to send that ultrasonic (direction is advisable around slurry congee pipeline with cross section in slurry congee pipeline, tangential slurry congee) ultrasound emission mechanism is ultrasonic transducer and resonance thin slice in the present embodiment.
According to actual conditions such as manufacturing technique and mounting conditions, ultrasonic transducer and/or resonance thin slice can be made suitable shape, can be strip, the compartment of terrain is distributed in slurry congee pipeline outside, as Fig. 2 a.Can be cannula-like, be coated on slurry congee pipeline outside, as Fig. 2 b.Can be a watt shape, two or multi-disc be attached on the slurry congee pipeline and link together, as Fig. 2 c.Other shapes that comprise above shape, ultrasonic transducer, resonance thin slice are called the ultrasonic poly-pipe that falls in the present invention, and a whole set of ultrasonoscope is called the ultrasonic poly-instrument that falls.
And, the length of ultrasonic transducer is set suitably according to conditions such as output, slurry congee flow velocity, slurry congee duct lengths, as 0.5-2M, length hour also can the multiple spot setting be fallen poly-pipe or a whole set of ultrasonoscope on slurry congee pipeline.
Also can control the ultrasonic of slurry congee and fall the poly-time in addition by the flow velocity and the cycle-index of control slurry congee in falling poly-pipe, and impurity such as continuation stripping lignin.
Claims (10)
1. ultrasonic the falling of bamboo wood pulps gathered the production method of making viscose, it is characterized in that step is as follows:
A. bamboo pulp, wood pulps obtain compound slurry congee through alkali steeping;
B. starch congee in leading to the squeezer process, under the ultrasonoscope effect, finish fall poly-, hyperacoustic power 1.0KW～3.5KW, frequency of ultrasonic 20～60KHz;
C. fall the squeezing of poly-back and obtain compound alkali fibre;
D. with the fine viscose of producing of compound alkali.
2. the ultrasonic production method of falling poly-manufacturing viscose of string according to claim 1, it is characterized in that: described ultrasonoscope comprises ultrasonic generation mechanism and ultrasound emission mechanism, ultrasound emission mechanism is arranged on slurry congee pipeline outside.
3. the ultrasonic production method of falling poly-manufacturing viscose of string according to claim 1 and 2 is characterized in that: hyperacoustic power 0.5KW～3.5KW, frequency of ultrasonic 20～60KHz.
4. string according to claim 1 and 2 is ultrasonic to fall the poly-production method of making viscose, it is characterized in that: described ultrasound emission mechanism is a strip, is distributed in slurry congee pipeline outside at interval, symmetrically.
5. string according to claim 1 and 2 is ultrasonic to fall the poly-production method of making viscose, it is characterized in that: described ultrasound emission mechanism is a cannula-like, is coated on slurry congee pipeline outside.
6. string according to claim 1 and 2 is ultrasonic to fall the poly-production method of making viscose, it is characterized in that: described ultrasound emission mechanism is a tile, and two or multi-disc are arranged symmetrically on the slurry congee pipeline.
7. the ultrasonic production method of falling poly-manufacturing viscose of string according to claim 2, it is characterized in that: described excusing from death produces mechanism and comprises ultrasonic generator, output transformer, impedor, and ultrasound emission mechanism is ultrasonic transducer, resonance thin slice.
8. the ultrasonic production method of falling poly-manufacturing viscose of string according to claim 1 and 2 is characterized in that: slurry congee flow velocity is 10～30m
3/ hour, slurry congee is 50 ℃～90 ℃ by ultrasonic temperature when falling poly-pipe, slurry congee concentration mass percent is 1.9%～4.1%.
9. the ultrasonic production method of falling poly-manufacturing viscose of bamboo wood pulps according to claim 1 and 2 is characterized in that:
The effect of described A operation is to form alkali cellulose, and impurity such as stripping bamboo quality, the A operation is finished in treating tank, alkali liquid temperature: 60 ℃～90 ℃, alkali concn 50g/l～120g/l, slurry congee concentration 1.9%～4.1%, dip time: 40min～70min; Add auxiliary agent when adding alkali lye: methyl isopropyl ketone-ethanol bonding solvent, the volume ratio of methyl isopropyl ketone and ethanol are 1-3: 1;
Described C operation adopts squeezer that slurry congee entrance pressure is pressed, it is 60 ℃～80 ℃ that pressing temperature requires, squeeze pressure 300mbar～700mbar, the fine content mass percent 26%～41% of the first of the alkali fibre after the squeezing, alkali fiber content mass percent: fine viscosity: the 9mPa.s～13mPa.s of alkali 14%～17%;
Described D operation comprises the squeezing yellow, obtains viscose glue, and viscose glue obtains viscose, final purification through filtration, deaeration, spinning.
10. the ultrasonic production method of falling poly-manufacturing viscose of bamboo wood pulps according to claim 1, it is characterized in that: wood pulps and bamboo pulp are compound when alkali steeping, make compound slurry congee; Perhaps carry out respectively being combined into compound slurry congee again after alkali steeping is made slurry congee.
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| JP2009108426A (en) * | 2007-10-26 | 2009-05-21 | Futamura Chemical Co Ltd | Method for producing starch fiber |
| CN101602810A (en) * | 2008-06-10 | 2009-12-16 | 宜宾海丝特纤维有限责任公司 | Plant fiber degrading and polymerizing technology |
| CN101603210A (en) * | 2008-06-10 | 2009-12-16 | 宜宾海丝特纤维有限责任公司 | String is made the production method of viscose |
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2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009108426A (en) * | 2007-10-26 | 2009-05-21 | Futamura Chemical Co Ltd | Method for producing starch fiber |
| CN101602810A (en) * | 2008-06-10 | 2009-12-16 | 宜宾海丝特纤维有限责任公司 | Plant fiber degrading and polymerizing technology |
| CN101603210A (en) * | 2008-06-10 | 2009-12-16 | 宜宾海丝特纤维有限责任公司 | String is made the production method of viscose |
Non-Patent Citations (1)
| Title |
|---|
| 《华南理工大学工学博士学位论文》 20061231 唐爱民 超声波作用下纤维素纤维结构与性质的研究 40、47 1－7，10 , 第11期 2 * |
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| CN102041567B (en) | 2012-07-04 |
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