CN104831390A

CN104831390A - Light high-strength low-elongation viscose fiber and preparation method thereof

Info

Publication number: CN104831390A
Application number: CN201510275871.9A
Authority: CN
Inventors: 冯涛; 邓传东; 李蓉玲; 贺敏; 胡远成; 陈明付; 刘爱兵
Original assignee: Yibin Grace Group Co Ltd; Yibin Haisite Fiber Co Ltd
Current assignee: Yibin Grace Group Co Ltd; Yibin Haisite Fiber Co Ltd
Priority date: 2015-05-27
Filing date: 2015-05-27
Publication date: 2015-08-12

Abstract

The invention discloses a bright viscose fiber with high strength and low elongation and a preparation method thereof, the viscose fiber is prepared by sequentially carrying out dipping, grinding, squeezing and crushing, kneading, pure oxygen precipitation, yellowing, dissolving, filtering, defoaming, ripening, spinning and drafting and post-treatment on pulp raw materials, and the viscose fiber meets the following requirements: the fineness is 1.11-1.33D, the dry breaking strength is more than or equal to 3.10cN/dtex, and the wet breaking strength is more than or equal to 1.60 cN/dtex. The high-strength low-elongation viscose fiber is a novel fiber variety realized by technical innovation, has an index system different from common viscose fibers and modal fibers, shows the fiber characteristics of the modal fibers such as high strength and low elongation, has stronger skin-friendly performance than cotton fibers, can effectively replace the existing differential viscose fiber, improves the processability of the downstream process of the viscose fiber, and can promote the development and industrial upgrading of downstream novel textiles.

Description

One has high-strength flatness viscose of light type and preparation method thereof

Technical field

The present invention is that one has high-strength flatness viscose of light type and preparation method thereof, is specifically related to the technology controlling and process of light type high-strength flatness viscose staple fibre kind and preparation method thereof, belongs to the innovation of viscose staple fibre and cellulose fibre production technical field.

Background technology

Current textile fiber material is mainly divided into the natural fabric raw material for representative such as cotton, numb, the petroleum base fibrous raw material being representative with terylene, acrylic fibers etc., and take natural cellulosic materials as the bio-based fibrous raw material such as viscose of raw material regeneration.At present, along with the anxiety of the rare of land resource and human resources, sown areas of cotton are in downward trend year by year, and cotton production can not meet the growing needs of people's living standard; And day by day reducing and continuous enhancing that people realize textiles comfortableness, functional, environment-friendly type along with petroleum reserves, more and more come into one's own with the viscose that recyclability resource is produced for raw material.For viscose, as natural regeneration fiber, the quality of its existing natural fabric, there is again excellent machinability, its structure composition is similar to cotton, not only there is hygroscopicity high, good permeability, comfortable and easy to wear, easy dyeing, the multifrequency natures such as heat-resisting quantity is strong, simultaneously, there is again the unexistent drapability of cotton and flexibility, certainly, due to these excellent properties that viscose possesses, development in recent years is very rapid, the particularly viscose scale of common variety expansion sharply, this phenomenon causes raw material supply anxiety, market harmful competition is fierce, meanwhile, more limit exploitation and the industrial upgrading of downstream new textile.

Based on above-mentioned situation, be the sustainable development promoting viscose industry, producing viscose that is differential, functionalization has become current industry and has newly marked.The production method of a patent document CN102296373A(superfine high-strength high-modulus viscose fiber, 2011.12.28) disclose a kind of viscose that a kind of even structure, fibre strength and modulus exceed conventional variety more than 50%, the fibre strength of obtained viscose be 0.44 ~ 0.78dtex, dry strong >=3.1cN/dtex(li ox/dtex), wet strong >=2.1cN/dtex, wet modulus >=0.5cN/dtex, whiteness >=82.0%.

The high white powerful fine denier viscose staple fiber of patent document CN100359050C(mono-kind and production technology thereof, 2005.06.29) short rayon fiber that a kind of fiber number is thin, intensity is high is disclosed, compared with common viscose fiber, there is the advantages such as intensity is high, ABRASION RESISTANCE is strong, feel is fine and smooth, anti-fold, resistance to repeatedly distortion by the garment material of its processing, also can be used for weaving high grade yarn fabric products.

Patent document CN102251301A(production process of ultrafine-denier high-strength viscose fibers, 2011.11.23) disclose the preparation method of the viscose that a kind of fiber number is low, intensity is high, can obtain fiber number is the viscose that 1.11 dtexs and intensity are greater than 2.9 cN/dtex.

Only above-mentioned disclosed patent document can be known, for obtained differential, the viscose of functionalization, prior art is all that the mode by changing production technology realizes, wherein, include raw material, change of the shaping and technological parameter of viscose glue etc., the viscose obtained comparatively common viscose fiber has all carried out suitable optimization in fiber number and intensity, but for day by day fierce market competition, differential viscose does not meet exploitation and the industrial upgrading of downstream new textile to a greater extent, especially the same sky silk taking natural cellulosic materials as raw material and regenerate, model, the development of the fibrous raw materials such as copper ammonia fibre, the occupation rate of market of viscose is reduced increasingly.As: the preparation method of patent document CN101130885(fiber crops material viscose and the numb material viscose of preparation, 2008.02.27) a kind of viscose and the preparation technology thereof that utilize numb material plant production is disclosed, technique is simple, supplies consumption is low, and the numb material viscose produced has excellent whiteness, the performance such as intensity and elongate fiber, the numb material viscose prepared by this technique meets dry fracture strength >=1.820 cN/dtex, wet breaking strength >=1.12 cN/dtex, dry elongation at break >=15.4%, line density deviation ratio ± 6.00%, length variation rate ± 6.00%, overcut fibre rate≤1.0%, over-length fibre≤18.0mg/100g, fault≤11mg/100g, residual sulphur≤18.0mg/100g.

For Modal fibre, we know, Modal fibre is for raw material with European beech, be made through special spinning technique after making wooden slurries, equally with cotton belong to natural fabric raw material together, without any pollution in the whole production process of Modal fibre, its dry strong cohesiveness is bordering on terylene, wetting, it is many to improve than common viscose fiber by force, no matter be gloss, flexibility, hygroscopicity, dyeability, dyefastness is all better than Pure cotton Product, with the fabric that it is made, not show only a kind of silk face gloss, have more pleasant soft touch sensation and dangle sense and fabulous endurable performance, it is a kind of desirable environmental protection fiber cellulose fiber.But due to Modal fibre textile technology cost intensive, the model circulated on the market belongs to model and cotton blending substantially, or viscose glue (people is cotton) fiber is directly taken to pretend to be model.

For this reason, we need to find one to be different from natural fabric raw material and petroleum base fibrous raw material, performance is better than again the New Viscose Fibre of differential viscose, the requirement of people to natural prodcuts (as: Modal fibre) can not only be met, industrialized continuous production can also be applicable to, for enterprise brings larger economic benefit, certainly, this is also the inexorable trend of viscose industry energy sustainable development.

Summary of the invention

One is the object of the present invention is to provide to have the high-strength flatness viscose of light type, this viscose is different from traditional viscose product and cotton is fine, it is the tencel kind realized by technological innovation, there is the index system being different from common viscose fiber and Modal fibre, it is high-strength that its product not only shows Modal fibre, the fiber characteristics of flatness, also show the skin-friendly that more cotton fibre is stronger, can effectively substitute existing differential viscose, while raising viscose lower procedure processing characteristics, exploitation and the industrial upgrading of downstream new textile can also be promoted, there is good social benefit.

Another object of the present invention is to provide a kind of preparation method having the high-strength flatness viscose of light type, this preparation method is using pulp material as raw materials for production, by viscose obtained after viscose glue preparation, spinning technique and post processing, in production process, still remain secondary response microscope sectional area, and the ectonexine area ratio at this interface is obviously different from the secondary response vestige of Modal fibre and common viscose fiber, ensure that this product has feature that is high-strength, flatness, also there is suitable water imbibition and significant fiber skin-friendly simultaneously.

The present invention is achieved through the following technical solutions: one has high-strength flatness viscose of light type and preparation method thereof, described viscose adopts that pulp material is pulverized through dipping, grinding, squeezing successively, poly-, yellow falls in rubbing, pure oxygen, dissolving, filtration, deaeration, maturation, obtained after spinning drawing and post processing, this viscose meets:

Fiber number 1.11 ~ 1.33D, dry fracture strength >=3.10 cN/dtex, wet breaking strength >=1.60cN/dtex,

Intensity >=the 0.55cN/dtex needed for 5% percentage elongation is produced under wet condition,

Dry elongation at break 13.0 ~ 16.0%, wet elongation at break 18.0 ~ 21.0%,

Degree of crystallinity 40.0 ~ 45.0%, radial water swelling capacity 22 ~ 26%.

The fiber number of the viscose that the present invention relates to is between 1.11 ~ 1.33D, belong to plain edition viscose product, there is product performance that is high-strength, flatness, also there is high water absorption character simultaneously, impart product and there is very strong skin-friendly, being much better than model, being slightly better than natural cotton, is the great innovation of viscose staple fibre and cellulose fibre production technical field.

Further, described high-strength flatness viscose also meets:

Line density deviation ratio≤± 4.0%, whiteness >=83%,

Residual sulphur≤8.0mg/100g, length variation rate≤± 6.0%,

Overcut fibre rate≤0.5%, over-length fibre≤4.0mg/100g,

Fault≤4.0mg/100g, dry ultimate strength mutation coefficient 18%.

Described pulp material comprises a kind of or two kinds and above combination in cotton pulp, bamboo pulp, wood pulp, jute pulp, and when practical application, cotton pulp, bamboo pulp, wood pulp, jute pulp can mix in any proportion.

The invention allows for a kind of preparation method having the high-strength flatness viscose of light type, comprise the following steps:

A: by pulp material soda-dip, then through grinding, squeezing pulverize, rub after make slurry congee;

B: send into reactor after being mixed with alkali lye by slurry congee, use pure oxygen obtains alkali cellulose after falling and gathering;

C: use the cellulose sulfonate that dissolution with solvents alkali cellulose and carbon disulfide are obtained by reacting, obtains cellulose sulfonate solution;

D: by cellulose sulfonate solution after filtration, deaeration, obtained spinning solution after maturation, then the spinning solution that will obtain obtained high-strength flatness viscose after spinning drawing and post processing.

In the production process of product, fibrous inside forming structure leaves obvious secondary response indication character, still remain secondary response microscope sectional area, do fibre section by after the viscose fiber staining that the present invention relates to, when the stained slice with common viscose fiber and Modal fibre contrasts, can find, its reaction vestige is high-visible, and interface ratio is moderate, ensure that this product has feature that is high-strength, flatness, also have suitable water imbibition, fiber skin-friendly has significant advantage simultaneously.

Above-mentioned secondary response microscope interface is inhaled look ability difference according to fiber cross section to dyestuff and is formed, i.e. cortex, the sandwich layer of fiber.It is few that cortex inhales look to dyestuff, dyes partially shallow; Sandwich layer inhales look ability greatly to dyestuff, and color is partially dark.Cortex has the higher degree of orientation, and cortex is many, and fracture strength is high, and sandwich layer is many, and water swelling capacity is high, and from the viscose that the present invention relates to, its fibrocortex is more, thus effectively can improve fibre strength.

In described steps A, the degree of polymerization be the pulp material concentration 110 ~ 240g/L of 650 ~ 1200 sodium hydroxide solution dipping 50 ~ 90min, then through grinding, squeezing pulverize, rub after make slurry congee, slurry congee concentration be 30 ~ 40%.

Steps A specifically can be summarized as follows:

1) degree of polymerization be 650 ~ 1200 pulp material be first placed on and feed on the machine dregs of rice, after setting certain rate of feeding, as 40kg/min, be added in the treating tank that alkali lye (sodium hydroxide solution of concentration 110 ~ 240g/L) is housed again, dipping 50 ~ 90min, make the slurry congee that concentration is 3 ~ 6% after grinding 10 ~ 40s by grinder, the object of grinding carries out shredding and dispersion by mechanism to fiber, thus improve cellulosic alkalization speed and alkalization rate;

2) the slurry congee of 3 ~ 6% is sent to squeezer, after squeezing, deliver to pulverizer pulverize, obtaining the fine content of first is 29 ~ 31%, alkali content is the alkali cellulose of 15 ~ 17%, in this step, squeezing function removes unnecessary alkali lye, the pressing temperature of squeezer is 57 ~ 63 DEG C, squeezing multiple is 2.2 ~ 2.8, the degree of grinding of pulverizer is 120 ~ 180g/L, in alkali lye, half fine content controls in 10g/L, prepare alkali cellulose data with traditional viscose to compare, the alkali cellulose that the present invention obtains half is fine low, product strength is high, the processing mode of this alkali lye uses filter screen 60 ~ 120 order, alkali fiber is reclaimed after hemicellulose unnecessary in the filter removal alkali lye of Zhen Kong Du – 0.4～– 0.1MPa element, kneading machine uses twin screw device, can make fiber sub-wire, brooming, reach the effect destroying cellulose fibre cell membrane, remove the Small molecular in cellulose, thus improve fibrin reaction performance, improve cellulose in conjunction with alkali content, reach 6 ~ 8%(mass percent),

3) this alkali cellulose is delivered to kneading machine, after process, obtain the slurry congee that concentration is 30 ~ 40%.

In described step B, reactor is sent into after the sodium hydroxide solution that slurry congee and concentration are 140 ~ 200g/L mixes, use pure oxygen fall poly-after to obtain the degree of polymerization be the alkali cellulose of 400 ~ 600, in reactor, the addition of pure oxygen is 2 ~ 10%, falls the poly-reaction time to control at 30 ~ 60min.

In stepb, the object adding pure oxygen is that oxidation is fallen poly-, after falling and gathering, the alkali cellulose degree of polymerization reduces to 400 ~ 600 by 650 ~ 1200, the fine purity of first is 98.0 ~ 98.5%, and the fine purity of first is higher, can improve 2 ~ 3% than traditional handicraft, orientation is fallen poly-fall more experienced than tradition and is gathered minimizing first fibre loss 3 ~ 5%, and molecule falls poly-more even, abundant.

In described step C, the sodium sulfite aqueous solution of described solvent comprises concentration to be 25 ~ 45 g/L sodium hydroxide solutions and concentration be 5 ~ 10 g/L; The addition of carbon disulfide is 25 ~ 37% of the fine content of first in the alkali cellulose that obtains of step B, and the concentration of the cellulose sulfonate solution of acquisition is 9.0 ~ 10.0%.

Step C specifically can be summarized as follows:

1) alkali cellulose that step B is obtained is sent to xanthating machine, and in xanthating machine, add the carbon disulfide of the fine content 25 ~ 37% of first in alkali cellulose, when practical application, carbon disulfide addition is very few, and yellow reaction is incomplete, filtration difficulty; Carbon disulfide addition is too high, yellow overreact, and accessory substance is more;

2) after yellow reaction, the cellulose sulfonate that yellow is obtained by reacting and dissolution with solvents, obtained concentration is the cellulose sulfonate solution of 9.0 ~ 10.0%, dissolving is carried out mixing, stir and grinding at cellulose sulfonate and solvent, solution temperature is 10 ~ 20 DEG C, and dissolution time is 30 ~ 50min.

For further improving the product performance of viscose, the present invention also improves spinning drawing technique, comprise the high salt of low acid relax acid bath technique and high stretch to spin mould technique etc., be in particular in, in described step D, spinning drawing step is as follows:

E: by cellulose sulfonate solution after filtration, deaeration, deliver to spinning machine after maturation, after a bath, tow is formed by the shower nozzle extruding spinning thread of spinning machine, the coagulating bath that a described bath uses comprises the zinc sulfate of the sulfuric acid of 90 ~ 120g/L, the sodium sulphate of 220 ~ 280g/L and 8 ~ 15g/L, and a bath temperature is 40 ~ 50 DEG C;

F: the tow after a bath sends into two baths by one drawing machine, the coagulating bath that described two baths use comprises the sulfuric acid of 18 ~ 22g/L, and the degree of draft of described one drawing machine is 50 ~ 100%, two bath temperatures is 80 ~ 90 DEG C;

G: the tow after two baths sends into three baths by two road drawing machines, the coagulating bath that described three baths use comprises the sulfuric acid that pH value is 1 ~ 3, and the degree of draft of described two road drawing machines is 40 ~ 60%, three bath temperatures is 80 ~ 90 DEG C;

H: the tow after three baths delivers to post processing part by three road drawing machines, and the degree of draft of described three road drawing machines is 5 ~ 15%.

As mentioned above, the present invention adopts three bath wet spinning technology, viscose glue forms tow after draw-spinning process, ensure that the repeatedly reaction of fiber, in the process, fibre section can form secondary response microscope interface clearly, there is the characteristic improving fibre strength, increase fibrous absorbent speed and increasing fiber water-retaining property, in spinning technique, tow is stretched by one drawing machine, two road drawing machines, three road drawing machines, more be conducive to the fragility improving fiber, the degree of stretching of fiber is improved.

In described step D, post processing comprises desulfurization that the tow that formed spinning drawing carries out, bleaches and oil, and the desulfurizing agent that described desulfurization uses is made up of the sodium carbonate of concentration to be the vulcanized sodium of 4 ~ 8g/L and concentration be 1 ~ 4g/L; The hydrogen peroxide that the bleaching agent that described bleaching uses is concentration 0.3 ~ 0.6g/L; The described finish addition used that oils is 7 ~ 9g/L, and after oiling, the pH value of tow is 6.5 ~ 7.

The present invention adopts gentle sulfur removal technology, the damage of product strength, degree of stretching is reduced, when reality uses, NaOH, the sodium sulfite of the more existing use of desulfurizing agent of vulcanized sodium and sodium carbonate composition are gentleer, the sulfuric acid brought from acid bath with tow in sodium carbonate energy, after sulfur removal technology, the pH value of adjustable tow is 8 ~ 11; Comparatively the bleaching agent such as clorox is gentleer for hydrogen peroxide bleaching agent, the pH value of viscose prepared by the present invention should control in 6.5 ~ 7 scopes, also by the mode adjust ph of washing, multiple-effect acid (organic acid), within the scope of this, the strength and elongation of viscose final product can not be affected, and strength and elongation is high.

Further, described desulfurization temperature is 50 ~ 55 DEG C, and desulfurization time is 2 ~ 3min; Described bleaching temperature is 50 ~ 55 DEG C, and bleaching time is 1 ~ 2min; The temperature of described finish is 50 ~ 55 DEG C.

For obtaining qualified high-strength flatness viscose product, in the present invention, described post processing also comprises oven dry, described oven dry is that desulfurization, the tow bleaching and obtain after oiling that the tow formed spinning drawing carries out makes to Tumble Dry, bake out temperature is 75 ~ 115 DEG C, after oven dry, obtain high-strength flatness viscose product, product regain controls 11 ~ 13.5%.

The present invention compared with prior art, has the following advantages and beneficial effect:

(1) viscose that the present invention relates to is the tencel kind realized by technological innovation, belong to the great innovation of viscose staple fibre and cellulose fibre production technical field, this viscose is different from traditional viscose product and cotton is fine, there is the index system being different from common viscose fiber and Modal fibre, fiber number is that the fibre strength of 1.11 ~ 1.33D reaches more than 3.1cN/dtex, higher by about 30% than common bio-based staple fibre intensity, close to model, there is the high strength of Modal fibre, low elongation, degradable feature, make fabric not yielding, also there is more cotton fibre, the better hygroscopicity of model and gas permeability, and it is soft, smoothly, outward appearance is beautiful, can effectively substitute existing differential viscose, while raising viscose lower procedure processing characteristics, exploitation and the industrial upgrading of downstream new textile can also be promoted, there is good economic benefit and social benefit.

(2) the present invention adopts three bath wet spinning technology, what coagulating bath adopted is the high salt of low acid, reaction condition is gentle, and viscose glue forms tow after draw-spinning process, ensure that the repeatedly reaction of fiber, viscose of the present invention has the secondary response interface different from common viscose fiber and Modal fibre, it should be noted that, secondary response interface is inhaled look ability difference according to fiber cross section to dyestuff and is formed, the i.e. cortex of fiber and sandwich layer, cortex is little to dyestuff suction look ability, dye partially shallow, sandwich layer is large to dyestuff suction look ability, color is partially dark, cortex has the higher degree of orientation, cortex is more, fracture strength is higher, and sandwich layer is more, water swelling capacity is higher, fibre section is done after dyed for fiber of the present invention, the fibre section of the viscose that the present invention relates to shows clear, obvious secondary response microscope sectional area, sandwich layer, cortex " area " ratio are (40 ~ 70): (30 ~ 60), ratio is moderate, and the sandwich layer of common viscose fiber and cortex " area " ratio are (90 ~ 95): (5 ~ 10), the inclined internal layer of ratio, therefore viscose of the present invention is compared with common viscose fiber, there is feature that is high-strength, flatness, also have suitable water imbibition, fiber skin-friendly has significant advantage simultaneously, do fibre section after Modal fibre dyeing, examine under a microscope, without secondary response interface, viscose of the present invention and Modal fibre are under equal dyeing condition, and viscose of the present invention inhales color depth than model, and dye-uptake is high, uniformity is better, and the COLOR FASTNESS of finished product is good.

(3) for guaranteeing that high-strength flatness viscose secondary response interface has suitable cortex, sandwich layer ratio, the present invention, from technology, has accomplished improvement acid bath technique, as reduced sulfuric acid concentration, sluggish, improves skin thickness; Change viscose glue index, as viscose ripening degree, the fine index such as content, alkali content of first.

(4) compared with adhering process of the prior art, the alkali cellulose hemicellulose level that the present invention obtains is low, we know: hemicellulose refers to that the degree of polymerization is at the beta cellulose of 50 ~ 200 and the gamma-cellulose of degree of polymerization < 50, as long as the impact of hemicellulose has the following aspects: a. affects the uniformity of alkali cellulose; B. ageing time is extended; C. the yellowing rate of hemicellulose is more fine than first fast, consumes a certain amount of carbon disulfide, causes alkali cellulose esterification to reduce, and the solubility of sulphonic acid ester reduces; D. affect the filtration of viscose glue, the solubility of sulphonic acid ester reduces, and the potential aldehyde radical of its end is oxidized to metal ion in carboxyl and ash content as ferrous ion, manganese ion, calcium ion, magnesium ion, form the complex compound that viscosity is extremely strong, cause viscose filtration difficulty, yield poorly; E. hemicellulose is more, and the physical and mechanical properties of viscose is poorer.The present invention passes through grinding mill, can grind the slurry congee sending into squeezer in advance, milling time is 10 ~ 40s, by the slurry congee after grinding with after squeezer squeezing, be separated and obtain mixed alkali liquor and alkali cellulose, containing hemicellulose and other impurity in mixed alkali liquor, pulverize through pulverizer, the multiple of squeezing is 2.2 ~ 2.8, degree of grinding is 120 ~ 180g/L, by mechanism, to improve the reactivity worth of slurry congee, ensure carrying out smoothly of viscose production.

(5) the inventive method is raw materials for production with natural cellulosic materials, and the viscose prepared is the same with cotton fibre, Modal fibre etc., is degradable fibrous material, meets the requirement of people to environmental protection.

(6) mixtures that the pulp material that the present invention uses can choose any one or both in cotton pulp, bamboo pulp, wood pulp, jute pulp above can be prepared in any proportion, raw material scope is widely applicable, technical requirement is prepared relatively low, and the cost of raw material is lower.

(7) the present invention passes through tube mill, can roll the slurry congee sending into squeezer in advance, pass through mechanism, fiber can be carried out tearing and discongesting, to improve the reactivity worth of slurry congee, ensure carrying out smoothly of viscose production, prepare alkali cellulose data with traditional viscose and compare, alkali cellulose half fibre that the present invention obtains lower (in alkali lye half fine content≤10g/L), product strength is high.

(8) the present invention adopts multistage purification, as grinding, squeezing are pulverized, rubbed, alkali lye cascade utilization, as respectively before impregnation stage, rub the stage after add alkali lye, cellulose can not only be mentioned in conjunction with alkali content, reach the object of the comprehensive utilization ratio improving alkali lye, simultaneously, the input cost of auxiliary material alkali lye can also be effectively reduced, reduce the production cost of viscose.

(9) the present invention can obtain the alkali cellulose of the fine content 29 ~ 31% of first, alkali content 15 ~ 17% after pulverizing through grinding, squeezing, this alkali cellulose through rub, be oxidized fall poly-after can directly send into viscose production system, cellulose viscose manufacturing technique can adopt common process, after yellow acquisition viscose glue, then through filtration, maturation, deaeration, spinning to obtain viscose.

(10) in the present invention, alkali cellulose fiber processes through kneader twin screw device, make fiber sub-wire, brooming, reach the cell membrane destroying cellulose fibre, remove the Small molecular in cellulose, thus improve fibrin reaction performance, improve cellulose in conjunction with alkali content, reach 6 ~ 8%(mass percent).

(11) the present invention through oxidation fall poly-after, the alkali cellulose degree of polymerization reduces to 400 ~ 600 by 650 ~ 1200, the fine purity of first can reach 98.0 ~ 98.5%, can 2 ~ 3% be improved than traditional handicraft, orientation is fallen poly-fall more experienced than tradition and is gathered minimizing first fibre loss 3 ~ 5%, molecule falls poly-more even, abundant, effectively can improve the intensity of viscose product.

(12) the present invention adopts three bath wet spinning technology, viscose glue forms tow after draw-spinning process, ensure that the repeatedly reaction of fiber, the tow formed with traditional spining technology compares, in the process, the bunch fiber cross section that three bath wet spinnings obtain can form secondary response microscope interface clearly, that is: core, cortex " area " ratio are respectively (40 ~ 70): (30 ~ 60), has the characteristic improving fibre strength, increase fibrous absorbent speed and increasing fiber water-retaining property.

(13) yellow that the present invention relates to, spinning technique have environmental protection, energy-conservation advantage, in yellowing processes of the present invention, the consumption of carbon disulfide calculates with the fine content of first at 30%() left and right, during model production yellow, carbon disulfide consumption calculates with the fine content of first up to 35%() left and right, this production technology can effectively reduce costs and reduce air pollution; When model spinning, acid bath adopts high zinc sulfate, low sodium sulphate to combine, it is serious that high zinc sulfate can lead heavy metal pollution of water body, low sodium sulphate then can cause its acid bath evaporation crystallization energy consumption high, thus this technique relate to yellow, spinning technique production cost also lower.

(14) in spinning technique of the present invention, tow is by many baths, low acid, less salt wet spinning technology, simultaneously, in conjunction with step by step, high drawing-off technology carries out spinning, one degree of draft is 50 ~ 100%, two road degree of drafts be 40 ~ 60%, three road degree of drafts is 5 ~ 15%, is more conducive to the fragility improving fiber, the degree of stretching of fiber is improved, show: produce the intensity >=0.55cN/dtex needed for 5% percentage elongation under wet condition, dry elongation at break is 13.0 ~ 16.0%.

(15) the present invention has gentle sulfur removal technology, the damage of fiber product intensity, degree of stretching can be made to reduce, when reality uses, NaOH, the sodium sulfite of the more existing use of desulfurizing agent of vulcanized sodium and sodium carbonate composition are gentleer, the sulfuric acid brought from acid bath with tow in sodium carbonate energy, after sulfur removal technology, the pH value of adjustable tow is 8 ~ 11.

(16) bleaching agent of the present invention's use is gentle, comparatively the bleaching agent such as clorox is gentleer to adopt hydrogen peroxide bleaching agent, the pH value of viscose prepared by the present invention should control in 6.5 ~ 7 scopes, also by the mode adjust ph of washing, multiple-effect acid (organic acid), within the scope of this, the strength and elongation of viscose final product can not be affected, and strength and elongation is high.

(17) by the impact of the aspect of tow intensity and percentage elongation etc., in present invention process step spin speed obviously comparatively model spinning higher (model spins fast 30m/min, this technique spins fast 50 m/min), simultaneously, in conjunction with in spinning drawing technique to the optimization of acid bath composition and draft process, the controling parameters of each process of overall balance can be accomplished, and appropriate, it is high that the present invention also has prouctiveness, the operational characteristic effectively reduced costs.

(18) the present invention is reasonable in design, in the production process of identical viscose product, the aspects such as comprehensive above-mentioned raw materials is chosen, preparation process amelioration, the production cost of the reduction viscose product of high degree, its price is low 4000 ~ 5000 yuan/ton compared with Modal fibre, significantly can reduce downstream raw material use cost, can be used for that family is spun, nonwoven fabric etc., particularly underwear and facial mask, hygenic towelette etc., for down-stream enterprises such as spinning, weave cotton cloth brings more high added value and wide market prospects, the market competitiveness of remarkable enterprise.

Accompanying drawing explanation

Fig. 1 is the fibre section cross section of the high-strength flatness viscose that the inventive method obtains.

Fig. 2 is the fibre section cross section of model.

Fig. 3 is the fibre section cross section of sky silk.

Detailed description of the invention

Below goal of the invention of the present invention, technical scheme and beneficial effect are described in further detail.

It should be noted that, it is all exemplary for below describing in detail, be intended for the requested to provide further explanation of the invention, except as otherwise noted, all technology used herein and scientific terminology have the identical meanings usually understood with general technical staff of the technical field of the invention.

It silk, model, copper ammonia fibre, the fibrous raw materials such as viscose are all take natural cellulosic materials as the bio-based fibrous raw material that raw material regenerates, wherein, the highest with the occupation rate of market of viscose, but along with the viscose scale of common variety in recent years sharply expands, raw material supply is nervous, exploitation and the industrial upgrading of downstream new textile are progressively restricted, for overcoming this phenomenon, with patent document CN102296373A, CN100359050C, CN102251301A is that a series of differential viscose of example is suggested, patented technology disclosed in it, this kind of differential viscose is all that the mode by changing production technology realizes, but for day by day fierce market competition, differential viscose does not meet exploitation and the industrial upgrading of downstream new textile to a greater extent, especially the same sky silk taking natural cellulosic materials as raw material and regenerate, model, the development of the fibrous raw materials such as copper ammonia fibre, the occupation rate of market of viscose is reduced increasingly.On this basis, the present invention proposes one and have the high-strength flatness viscose of light type and its preparation process thereof, the high-strength flatness viscose product prepared has product performance that is high-strength, flatness, also there is high-selenium corn characteristic simultaneously, product skin-friendly outclass Modal fibre, is slightly better than cotton fiber.

The viscose that the present invention relates to is in fiber forming process, maintain exclusive fibre structure, there is the feature of high-tenacity, its dry fracture strength improves about 25% with wet breaking strength compared with common viscose fiber, with differential viscose, also there is obvious difference, as can be seen from product index, the product index of high-strength flatness viscose meets: fiber number 1.11 ~ 1.33D, dry fracture strength >=3.10 cN/dtex, wet breaking strength >=1.60cN/dtex, and differential viscose records CN102296373A with patent document, CN100359050C, CN102251301A is example, its product index is as follows: CN102296373A meets fiber number 0.44 ~ 0.78dtex, dry fracture strength >=3.10 cN/dtex, wet breaking strength >=2.1cN/dtex, CN100359050C meets fiber number 0.90 ~ 1.40dtex, dry fracture strength >=2.50 cN/dtex, wet breaking strength >=1.20cN/dtex, CN102251301A meets fiber number 1.11 dtex, intensity >=2.9 cN/dtex, and as can be seen from These parameters, the fibre strength of the viscose that the present invention relates to obviously is better than existing differential viscose.

Compared with Modal fibre, sky silk respectively by the high-strength flatness viscose that the present invention relates to, alignments is as follows again:

By high-strength flatness viscose, Modal fibre, fibre section is done after it silk dyes respectively, its fibre section is amplified 2000 times under the microscope observe, as shown in Figures 1 to 3, Fig. 1 is the fibre section cross section of high-strength flatness viscose, as shown in Figure 1, after the dyed process of high-strength flatness viscose that the present invention relates to, its fibrocortex, the color of sandwich layer shows shallow respectively, dark difference, differ greatly, cortex is partially shallow, sandwich layer is obviously partially dark, there is secondary response interface clearly, ratio is moderate, ensure that this product has high-strength, the feature of flatness, also there is suitable water imbibition simultaneously, fiber skin-friendly has significant advantage, wherein, sandwich layer: " area " ratio of cortex is 40 ~ 70:30 ~ 60.

Fig. 2 is the fibre section sectional view of Modal fibre, as shown in Figure 2, after the dyed process of Modal fibre, its fibrocortex is dark with the color of sandwich layer, shallow consistent, and without obvious secondary interface, this products characteristics enhances the hydrophobicity of fiber, water suction rate variance, thus its skin-friendly is deteriorated.

Fig. 3 is the fibre section sectional view of sky silk, as shown in Figure 3, after the dyed process of it silk, its fibrocortex is dark with the color of sandwich layer, shallow consistent, without obvious secondary interface, this products characteristics has concurrently outside the advantages such as the excellent hygroscopicity of plain edition viscose, soft and smooth elegant property, comfortableness, overcomes common viscose fiber brute force low, especially wet defect low by force, its brute force is almost close with terylene.

Just because of the said goods characteristic, determine the high-strength flatness viscose that the present invention relates to and meet following index:

Dry fracture strength >=3.10 cN/dtex, wet breaking strength >=1.60cN/dtex,

Dry elongation at break 13.0 ~ 16.0%, wet elongation at break 18.0 ~ 21.0%,

Degree of crystallinity 40.0 ~ 45.0%, radial water swelling capacity 22 ~ 26%,

Line density deviation ratio≤± 4.0%, whiteness >=83%,

Residual sulphur≤8.0mg/100g, length variation rate≤± 6.0%,

Overcut fibre rate≤0.5%, over-length fibre≤4.0mg/100g,

Fault≤4.0mg/100g.

These parameters is applicable to the mensuration that linear density range is the viscose of the high-strength flatness of 1.11dtex ~ 1.33dtex, the assay method of dry fracture strength is GB/T 14337, the assay method of wet breaking strength is GB/T 14337, the intensity produced under wet condition needed for 5% percentage elongation is completed by GB/T 14337, the assay method of dry elongation at break is GB/T 14337, the assay method of wet elongation at break is GB/T 14337, the assay method of line density deviation ratio is GB/T 14335, the assay method of residual sulphur is FZ/T 50014, the assay method of length variation rate is GB/T 14336, the assay method of overcut fibre rate is GB/T 14336, the assay method of over-length fibre is GB/T 14336, the assay method of fault is GB/T 14339, the assay method of whiteness is FZ/T 50013, the assay method of radial water swelling capacity is GB/T 6503.

Enumerate explanation the specific embodiment of the present invention with several exemplary embodiments below, certainly, protection scope of the present invention is not limited to following examples.

Embodiment 1:

The present invention relates to have light type high-strength flatness viscose be adopt that pulp material is pulverized through dipping, grinding, squeezing successively, rubbing, pure oxygen be obtained after falling poly-, yellow, dissolving, filtration, deaeration, maturation, spinning drawing and post processing, after measured, this viscose meets:

Fiber number 1.11D, dry fracture strength 3.10 cN/dtex, wet breaking strength 1.60cN/dtex,

The intensity 0.55cN/dtex needed for 5% percentage elongation is produced under wet condition,

Dry elongation at break 13.0%, wet elongation at break 18.0%,

Degree of crystallinity 40.0%, radial water swelling capacity 22%,

Line density deviation ratio-4%, whiteness 83%,

Residual sulphur 8.0mg/100g, length variation rate+0.5%,

Overcut fibre rate 0%, over-length fibre 0mg/100g,

Fault 0.5mg/100g.

Embodiment 2:

The difference of the present embodiment and embodiment 1 is: the pulp material that the present embodiment uses is that cotton pulp, bamboo pulp, wood pulp, the jute pulp adopting mass ratio to be 3:1:1:1 mixes.After testing, the viscose prepared by the present embodiment meets the product performance of high-strength flatness viscose.

Embodiment 3:

The difference of the present embodiment and embodiment 1 is: the pulp material that the present embodiment uses is that the cotton pulp that adopts mass ratio to be 4:1 and bamboo pulp mix.After testing, the viscose prepared by the present embodiment meets the product performance of high-strength flatness viscose.

Embodiment 4:

What the present embodiment related to has the preparation process of the high-strength flatness viscose of light type to have following steps:

Embodiment 5:

The difference of the present embodiment and embodiment 4 is: in the steps A that the present embodiment relates to, the degree of polymerization is the sodium hydroxide solution dipping 50min of the pulp material concentration 110g/L of 650, grind through grinder again, squeeze, pulverize, rub after make slurry congee, slurry congee concentration be 30%.

Embodiment 6:

The difference of the present embodiment and embodiment 5 is: in the steps A that the present embodiment relates to, the degree of polymerization is the sodium hydroxide solution dipping 90min of the pulp material concentration 240g/L of 1200, the slurry congee that concentration is 6% is made with after grinder grinding, this slurry congee is sent to squeezer, after squeezing, deliver to pulverizer pulverize, obtain alkali cellulose, this alkali cellulose is delivered to kneading machine, after process, obtain the slurry congee that concentration is 40%.

Embodiment 7:

The difference of the present embodiment and embodiment 6 is: in the present embodiment, and the pressing temperature of squeezer is 57 DEG C, squeezing multiple is set as 2.2; The degree of grinding of pulverizer is 120g/L, and the alkali cellulose obtained after pulverizing delivers to kneading machine again, obtains the slurry congee that concentration is 30% after process.

Embodiment 8:

The difference of the present embodiment and embodiment 6 is: in the present embodiment, and the pressing temperature of squeezer is 63 DEG C, squeezing multiple is set as 2.8; The degree of grinding of pulverizer is 180g/L, and the alkali cellulose obtained after pulverizing delivers to kneading machine again, obtains the slurry congee that concentration is 40% after process.

Embodiment 9:

The difference of the present embodiment and embodiment 4 is: in the step B that the present embodiment relates to, reactor is sent into after the sodium hydroxide solution that slurry congee and concentration are 140g/L mixes, the poly-rear acquisition degree of polymerization is 400, the fine purity of first is the alkali cellulose of 98.0% to use pure oxygen to fall, in reactor, the addition of pure oxygen is 2%, falls the poly-reaction time to control at 30min.

Embodiment 10:

The difference of the present embodiment and embodiment 4 is: in the step B that the present embodiment relates to, reactor is sent into after the sodium hydroxide solution that slurry congee and concentration are 200g/L mixes, the poly-rear acquisition degree of polymerization is 600, the fine purity of first is the alkali cellulose of 98.5% to use pure oxygen to fall, in reactor, the addition of pure oxygen is 10%, falls the poly-reaction time to control at 60min.

Embodiment 11:

The difference of the present embodiment and embodiment 4 is: in the step C that the present embodiment relates to, the addition of carbon disulfide is 30% of the fine content of first in the alkali cellulose that obtains of step B, the concentration of the cellulose sulfonate solution obtained is 9.0%, the yellow reaction time controls at 45min, and yellow reaction temperature is 25 DEG C.

Embodiment 12:

The difference of the present embodiment and embodiment 4 is: in the step C that the present embodiment relates to, and the sodium sulfite aqueous solution of solvent comprises concentration to be 25g/L sodium hydroxide solution and concentration be 10 g/L, solution temperature is 20 DEG C, and dissolution time is 40min.

Embodiment 13:

The difference of the present embodiment and embodiment 11 is: in the step C that the present embodiment relates to, alkali cellulose reacts with carbon disulfide generation yellow in xanthating machine, wherein, the addition of carbon disulfide is 25% of the fine content of first in the alkali cellulose that obtains of step B, the yellow reaction time should control at 45min, and yellow reaction temperature controls at 20 DEG C; The cellulose sulfonate obtained after yellow reaction and dissolution with solvents, course of dissolution is carried out mixing, stir and grinding at cellulose sulfonate and solvent, it is the sodium sulfite aqueous solution of 5g/L that solvent then adopts concentration to be 25g/L sodium hydroxide solution and concentration, solution temperature is 10 DEG C, dissolution time is 30min, and after dissolving, obtained concentration is the cellulose sulfonate solution of 9.0%.

Embodiment 14:

The difference of the present embodiment and embodiment 12 is: in the step C that the present embodiment relates to, alkali cellulose reacts with carbon disulfide generation yellow in xanthating machine, wherein, the addition of carbon disulfide is 37% of the fine content of first in the alkali cellulose that obtains of step B, the yellow reaction time should control at 50min, and yellow reaction temperature controls at 30 DEG C; The cellulose sulfonate obtained after yellow reaction and dissolution with solvents, course of dissolution is carried out mixing, stir and grinding at cellulose sulfonate and solvent, solvent then adopts concentration to be 45 g/L sodium hydroxide solutions and concentration to be the sodium sulfite aqueous solution of 10 g/L, solution temperature is 20 DEG C, dissolution time is 50min, and after dissolving, obtained concentration is the cellulose sulfonate solution of 10.0%.

Embodiment 15:

The difference of the present embodiment and embodiment 4 is: the spinning drawing step that the present embodiment relates to can specifically be summarized as follows:

F: by cellulose sulfonate solution after filtration, deaeration, deliver to spinning machine after maturation, after a bath, tow is formed by the shower nozzle extruding spinning thread of spinning machine, the coagulating bath that a described bath uses comprises the zinc sulfate of the sulfuric acid of 90g/L, the sodium sulphate of 220g/L and 8g/L, and the temperature of a bath is set as 40 DEG C, the acid bath drop of a bath is 3g/L;

G: the tow after bathing through sends into two baths by one drawing machine, the coagulating baths that described two baths use comprise the sulfuric acid of 18g/L, and the degree of draft of described one drawing machine is that 50%, two temperature of bathing are set as 80 DEG C;

H: the tow after bathing through two sends into three baths by two road drawing machines, the coagulating baths that described three baths use comprise the sulfuric acid that pH value is 1, and the degree of draft of described two road drawing machines is that 40%, three temperature of bathing are set as 80 DEG C;

I: the tow after three baths delivers to post processing part by three road drawing machines, and the degree of draft of described three road drawing machines is 5%.

Embodiment 16:

The difference of the present embodiment and embodiment 15 is: in the present embodiment, the post-processing step that the present embodiment relates to specifically can be summarized as follows: to spinning drawing formed tow carry out desulfurization, bleach and oil, wherein, the desulfurizing agent that uses of desulfurization is made up of the sodium carbonate of concentration to be the vulcanized sodium of 4g/L and concentration be 1g/L; The hydrogen peroxide that the bleaching agent that bleaching uses is concentration 0.3g/L; The finish addition used that oils is 7g/L, and after oiling, the pH value of tow is 6.5.

In above-mentioned steps, desulfurization temperature is set as 50 DEG C, and desulfurization time is set as 2min; Bleaching temperature is set as 50 DEG C, and bleaching time is set as 1min; The temperature of finish is set as 50 DEG C.

Embodiment 17:

The difference of the present embodiment and embodiment 16 is: the post-processing step that the present embodiment relates to also includes drying and processing, oven dry is that desulfurization, the tow bleaching and obtain after oiling that the tow formed spinning drawing carries out makes to Tumble Dry, bake out temperature is 75 DEG C, after oven dry, obtain high-strength flatness viscose product, in the present embodiment, the regain of strong flatness viscose product should control 11%.

Embodiment 18:

The step of preparation process of the high-strength flatness viscose that the present embodiment relates to is as follows:

A: (adopt mass ratio to be that the cotton pulp of 5:1 and jute pulp mix pulp material, its degree of polymerization is 1100) impregnated in and be equipped with in the treating tank of alkali lye, dipping temperature 35 DEG C, dip time 70min, after grinding 30s, makes the slurry congee that concentration is 5% by tubular type grinder, wherein, pulp material is made up of wood pulp, and alkali lye is the sodium hydroxide solution of concentration 110 ~ 240g/L, and the temperature of the slurry congee of acquisition is 30 DEG C;

B: squeezer delivered to by the slurry congee that steps A is obtained, setting pressing temperature 60 DEG C, squeezing multiple 2.5, deliver to pulverizer and pulverize after squeezing, setting degree of grinding is 160g/L, obtain alkali cellulose, this alkali cellulose is delivered to kneading machine, after process, obtain the slurry congee that concentration is 35%;

C: deliver to reactor after being mixed with alkali lye by the slurry congee that step B is obtained, add pure oxygen in the reactor, fall poly-after obtain that the degree of polymerization is 600, the fine purity of first is the alkali cellulose of 98.5%, wherein, alkali lye selects the sodium hydroxide solution of concentration 180g/L, in reactor, the addition of pure oxygen is 8%, falls the poly-reaction time to control at 60min;

D: the alkali cellulose that step C is obtained delivers to xanthating machine, alkali cellulose reacts with carbon disulfide generation yellow in xanthating machine, wherein, the addition of carbon disulfide is 37% of the fine content of first in the alkali cellulose that obtains of step B, the yellow reaction time should control at 50min, yellow reaction temperature controls at 30 DEG C, the cellulose sulfonate obtained after yellow reaction and dissolution with solvents, course of dissolution is mixed with solvent by cellulose sulfonate, stir and grinding, solvent then adopts concentration to be 45 g/L sodium hydroxide solutions and concentration to be the sodium sulfite aqueous solution of 7 g/L, solution temperature is 15 DEG C, dissolution time is 45min, after dissolving, obtained concentration is the cellulose sulfonate solution of 10.0%.

E: by cellulose sulfonate solution obtained for step D after filtration, deaeration, obtain spinning solution after maturation;

F: spinning machine delivered to by spinning solution step e obtained, after a bath, tow is formed by the shower nozzle extruding spinning thread of spinning machine, the coagulating bath that a described bath uses comprises the zinc sulfate of the sulfuric acid of 100g/L, the sodium sulphate of 260g/L and 12g/L, and a bath temperature is 50 DEG C, and a bath acid bath drop is 5g/L;

G: the tow after a bath sends into two baths by one drawing machine, the coagulating bath that described two baths use comprises the sulfuric acid of 20g/L, and the degree of draft of described one drawing machine is 80%, two bath temperatures is 88 DEG C;

H: the tow after two baths sends into three baths by two road drawing machines, the coagulating bath that described three baths use comprises the sulfuric acid that pH value is 2, and the degree of draft of described two road drawing machines is 58%, three bath temperatures is 90 DEG C;

I: the tow after three baths delivers to step J by three road drawing machines, and the degree of draft of described three road drawing machines is 5%;

J: the tow obtained step I carries out desulfurization, bleaches and oil, wherein, the desulfurizing agent that desulfurization uses is made up of the sodium carbonate of concentration to be the vulcanized sodium of 8g/L and concentration be 4g/L, setting desulfurization temperature is 55 DEG C, desulfurization time is 2min, the hydrogen peroxide that the bleaching agent that bleaching uses is concentration 0.5g/L, setting bleaching temperature is 55 DEG C, and bleaching time is 2min; The temperature used that oils is the finish of 55 DEG C, and its addition is 9g/L, and after oiling, the pH value of tow is 7;

K: make to Tumble Dry through desulfurization, the tow bleaching and obtain after oiling in step J, bake out temperature is set as 115 DEG C, after oven dry, and obtain high-strength flatness viscose product, product regain controls 12%.

From above-mentioned production process, this preparation process does not add delustering agent, and the viscose product of acquisition belongs to light type viscose, and after testing, this viscose meets the product performance of high-strength flatness viscose.

Embodiment 19:

A: pulp material (is adopted that mass ratio is the bamboo pulp of 1:3:2, wood pulp and jute pulp mix, its degree of polymerization is 650) impregnated in and be equipped with in the treating tank of alkali lye, dipping temperature 40 DEG C, dip time 60min, after grinding 40s, makes the slurry congee that concentration is 5% by tubular type grinder, wherein, pulp material is made up of wood pulp, and alkali lye is the sodium hydroxide solution of concentration 130g/L, and the temperature of the slurry congee of acquisition is 45 DEG C;

C: deliver to reactor after being mixed with alkali lye by the slurry congee that step B is obtained, add pure oxygen in the reactor, fall poly-after obtain that the degree of polymerization is 500, the fine purity of first is the alkali cellulose of 98.5%, wherein, alkali lye selects the sodium hydroxide solution of concentration 190g/L, in reactor, the addition of pure oxygen is 10%, falls the poly-reaction time to control at 60min;

D: the alkali cellulose that step C is obtained delivers to xanthating machine, alkali cellulose reacts with carbon disulfide generation yellow in xanthating machine, wherein, the addition of carbon disulfide is 36% of the fine content of first in the alkali cellulose that obtains of step B, the yellow reaction time should control at 50min, yellow reaction temperature controls at 30 DEG C, the cellulose sulfonate obtained after yellow reaction and dissolution with solvents, course of dissolution is mixed with solvent by cellulose sulfonate, stir and grinding, solvent then adopts concentration to be 45 g/L sodium hydroxide solutions and concentration to be the sodium sulfite aqueous solution of 7 g/L, solution temperature is 20 DEG C, dissolution time is 50min, after dissolving, obtained concentration is the cellulose sulfonate solution of 9.5%.

F: spinning machine delivered to by spinning solution step e obtained, after a bath, tow is formed by the shower nozzle extruding spinning thread of spinning machine, the coagulating bath that a described bath uses comprises the zinc sulfate of the sulfuric acid of 110g/L, the sodium sulphate of 255g/L and 12g/L, and a bath temperature is 50 DEG C, and a bath acid bath drop is 5g/L;

G: the tow after a bath sends into two baths by one drawing machine, the coagulating bath that described two baths use comprises the sulfuric acid of 18g/L, and the degree of draft of described one drawing machine is 80%, two bath temperatures is 85 DEG C;

H: the tow after two baths sends into three baths by two road drawing machines, the coagulating bath that described three baths use comprises the sulfuric acid that pH value is 2, and the degree of draft of described two road drawing machines is 50%, three bath temperatures is 85 DEG C;

I: the tow after three baths delivers to step J by three road drawing machines, and the degree of draft of described three road drawing machines is 15%;

J: the tow obtained step I carries out desulfurization, bleaches and oil, wherein, the desulfurizing agent that desulfurization uses is made up of the sodium carbonate of concentration to be the vulcanized sodium of 6g/L and concentration be 3g/L, setting desulfurization temperature is 53 DEG C, desulfurization time is 3min, the hydrogen peroxide that the bleaching agent that bleaching uses is concentration 0.6g/L, setting bleaching temperature is 55 DEG C, and bleaching time is 2min; The temperature used that oils is the finish of 55 DEG C, and its addition is 8g/L, and after oiling, the pH value of tow is 6.8;

Embodiment 20:

A: pulp material (is adopted that mass ratio is 5:3 bamboo pulp, wood pulp mixes, its degree of polymerization is 1050) impregnated in and be equipped with in the treating tank of alkali lye, dipping temperature 45 DEG C, dip time 80min, after grinding 40s, makes the slurry congee that concentration is 5.5% by tubular type grinder, wherein, pulp material is made up of wood pulp, and alkali lye is the sodium hydroxide solution of concentration 200g/L, and the temperature of the slurry congee of acquisition is 55 DEG C;

B: squeezer delivered to by the slurry congee that steps A is obtained, setting pressing temperature 60 DEG C, squeezing multiple 2.5, deliver to pulverizer and pulverize after squeezing, setting degree of grinding is 150g/L, obtain alkali cellulose, this alkali cellulose is delivered to kneading machine, after process, obtain the slurry congee that concentration is 35%;

C: deliver to reactor after being mixed with alkali lye by the slurry congee that step B is obtained, add pure oxygen in the reactor, fall poly-after obtain that the degree of polymerization is 480, the fine purity of first is the alkali cellulose of 98.4%, wherein, alkali lye selects the sodium hydroxide solution of concentration 180g/L, in reactor, the addition of pure oxygen is 10%, falls the poly-reaction time to control at 60min;

D: the alkali cellulose that step C is obtained delivers to xanthating machine, alkali cellulose reacts with carbon disulfide generation yellow in xanthating machine, wherein, the addition of carbon disulfide is 36.5% of the fine content of first in the alkali cellulose that obtains of step B, the yellow reaction time should control at 50min, yellow reaction temperature controls at 30 DEG C, the cellulose sulfonate obtained after yellow reaction and dissolution with solvents, course of dissolution is mixed with solvent by cellulose sulfonate, stir and grinding, it is the sodium sulfite aqueous solution of 6g/L that solvent then adopts concentration to be 42 g/L sodium hydroxide solutions and concentration, solution temperature is 19 DEG C, dissolution time is 46min, after dissolving, obtained concentration is the cellulose sulfonate solution of 9.5%.

F: spinning machine delivered to by spinning solution step e obtained, after a bath, tow is formed by the shower nozzle extruding spinning thread of spinning machine, the coagulating bath that a described bath uses comprises the zinc sulfate of the sulfuric acid of 115g/L, the sodium sulphate of 235g/L and 9g/L, one bath temperature is 44 DEG C, and a bath acid bath drop is 4.5g/L;

G: the tow after a bath sends into two baths by one drawing machine, the coagulating bath that described two baths use comprises the sulfuric acid of 21g/L, and the degree of draft of described one drawing machine is 91%, two bath temperatures is 88 DEG C;

H: the tow after two baths sends into three baths by two road drawing machines, the coagulating bath that described three baths use comprises the sulfuric acid that pH value is 2.6, and the degree of draft of described two road drawing machines is 52%, three bath temperatures is 85 DEG C;

J: the tow obtained step I carries out desulfurization, bleaches and oil, wherein, the desulfurizing agent that desulfurization uses is made up of the sodium carbonate of concentration to be the vulcanized sodium of 6g/L and concentration be 3.2g/L, setting desulfurization temperature is 55 DEG C, desulfurization time is 3min, the hydrogen peroxide that the bleaching agent that bleaching uses is concentration 0.6g/L, setting bleaching temperature is 55 DEG C, and bleaching time is 2min; The temperature used that oils is the finish of 55 DEG C, and its addition is 7g/L, and after oiling, the pH value of tow is 6.6;

K: make to Tumble Dry through desulfurization, the tow bleaching and obtain after oiling in step J, bake out temperature is set as 75 DEG C, after oven dry, and obtain high-strength flatness viscose product, product regain controls 13.5%.

Embodiment 21:

A: pulp material (is all adopted wood pulp, its degree of polymerization is 800) impregnated in and be equipped with in the treating tank of alkali lye, dipping temperature 60 DEG C, dip time 90min, after grinding 38s, makes the slurry congee that concentration is 3% by tubular type grinder, wherein, pulp material is made up of wood pulp, and alkali lye is the sodium hydroxide solution of concentration 160g/L, and the temperature of the slurry congee of acquisition is 50 DEG C;

B: squeezer delivered to by the slurry congee that steps A is obtained, setting pressing temperature 63 DEG C, squeezing multiple 2.3, deliver to pulverizer and pulverize after squeezing, setting degree of grinding is 140g/L, obtain alkali cellulose, this alkali cellulose is delivered to kneading machine, after process, obtain the slurry congee that concentration is 38%;

C: deliver to reactor after being mixed with alkali lye by the slurry congee that step B is obtained, add pure oxygen in the reactor, fall poly-after obtain that the degree of polymerization is 400, the fine purity of first is the alkali cellulose of 98.4%, wherein, alkali lye selects the sodium hydroxide solution of concentration 150g/L, in reactor, the addition of pure oxygen is 3%, falls the poly-reaction time to control at 45min;

D: the alkali cellulose that step C is obtained delivers to xanthating machine, alkali cellulose reacts with carbon disulfide generation yellow in xanthating machine, wherein, the addition of carbon disulfide is 25% of the fine content of first in the alkali cellulose that obtains of step B, the yellow reaction time should control at 50min, yellow reaction temperature controls at 20 DEG C, the cellulose sulfonate obtained after yellow reaction and dissolution with solvents, course of dissolution is mixed with solvent by cellulose sulfonate, stir and grinding, solvent then adopts concentration to be 45 g/L sodium hydroxide solutions and concentration to be the sodium sulfite aqueous solution of 60 g/L, solution temperature is 18 DEG C, dissolution time is 45min, after dissolving, obtained concentration is the cellulose sulfonate solution of 9.3%.

F: spinning machine delivered to by spinning solution step e obtained, after a bath, tow is formed by the shower nozzle extruding spinning thread of spinning machine, the coagulating bath that a described bath uses comprises the zinc sulfate of the sulfuric acid of 90g/L, the sodium sulphate of 220g/L and 8g/L, and a bath temperature is 40 DEG C, and a bath acid bath drop is 3g/L;

G: the tow after a bath sends into two baths by one drawing machine, the coagulating bath that described two baths use comprises the sulfuric acid of 18g/L, and the degree of draft of described one drawing machine is 60%, two bath temperatures is 90 DEG C;

H: the tow after two baths sends into three baths by two road drawing machines, the coagulating bath that described three baths use comprises the sulfuric acid that pH value is 2, and the degree of draft of described two road drawing machines is 60%, three bath temperatures is 85 DEG C;

I: the tow after three baths delivers to step J by three road drawing machines, and the degree of draft of described three road drawing machines is 12%;

J: the tow obtained step I carries out desulfurization, bleaches and oil, wherein, the desulfurizing agent that desulfurization uses is made up of the sodium carbonate of concentration to be the vulcanized sodium of 8g/L and concentration be 3g/L, setting desulfurization temperature is 55 DEG C, desulfurization time is 3min, the hydrogen peroxide that the bleaching agent that bleaching uses is concentration 0.3g/L, setting bleaching temperature is 50 DEG C, and bleaching time is 1min; The temperature used that oils is the finish of 50 DEG C, and its addition is 8g/L, and after oiling, the pH value of tow is 7;

K: make to Tumble Dry through desulfurization, the tow bleaching and obtain after oiling in step J, bake out temperature is set as 105 DEG C, after oven dry, and obtain high-strength flatness viscose product, product regain controls 12%.

The high-strength flatness viscose that above-described embodiment 1 ~ 7 obtains is detected, the desired value obtained is added up, in table 1.

Table 1

The high-strength flatness viscose that above-described embodiment 8 ~ 14 obtains is detected, the desired value obtained is added up, in table 2.

Table 2

The high-strength flatness viscose that above-described embodiment 15 ~ 21 obtains is detected, the desired value obtained is added up, in table 3.

Table 3

The desired value of the high-strength flatness viscose related to by above-described embodiment 1 ~ 21 removes calculating mean value after maximum and minimum of a value, compare calculating the mean value obtained with Modal fibre, differential viscose (CN102296373A documents 1, CN100359050C documents 2, CN102251301A documents 3) and the product index of common viscose fiber respectively, as shown in table 4.

Table 4

As can be seen from Table 4, the fibre strength (see dry fracture strength and wet breaking strength data) of the high-strength flatness viscose that the present invention relates to is apparently higher than the data target of common viscose fiber and differential viscose (documents 2, documents 3), and fibre strength is a little less than the data target of Modal fibre, elongate fiber rate (wet elongation at break and dry elongation at break data) is lower compared with the data target of common viscose fiber and Modal fibre, have high-strength, the product performance of flatness, on the other hand, from radial water swelling capacity data, the present invention again comparatively Modal fibre there is better skin-friendly, therefore, Modal fibre can be substituted there is wider Application Areas, certainly, in addition, by advanced process means, (namely raw material are selected in the present invention, auxiliary material controls, the improvement etc. of yellow and spinning technique) viscose for preparing also has higher cost performance compared with Modal fibre, comparatively Modal fibre is low 4000 ~ 5000 yuan/ton for ton silk price, therefore, also there is good market value.

As can be seen from Table 4, the Denier range of the high-strength flatness viscose that the present invention relates to is comparatively wide, and Denier range, between 1.11 ~ 1.33D, is applicable to plain edition viscose.

In the above-described embodiments, the high-strength flatness viscose product that the embodiment chosen arbitrarily in embodiment 1 ~ 21 is prepared and obtained, as embodiment 20, microscope sectional drawing is carried out to its fibre section, can find, its cross section remains with reacts vestige clearly, the color of its fibrocortex, sandwich layer shows shallow, dark difference respectively, cortex is obviously partially shallow, sandwich layer is partially dark, (internal layer+middle level): outer field " area " ratio is 67:30, belongs to sandwich layer: cortex=(40 ~ 70): in the scope of (30 ~ 60).

The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.

Claims

1. one kind has the high-strength flatness viscose of light type, it is characterized in that: described viscose adopts that pulp material is pulverized through dipping, grinding, squeezing successively, poly-, yellow falls in rubbing, pure oxygen, dissolving, filtration, deaeration, maturation, obtained after spinning drawing and post processing, this viscose meets:

Dry elongation at break 13.0 ~ 16.0%, wet elongation at break 18.0 ~ 21.0%,

Degree of crystallinity 40.0 ~ 45.0%, radial water swelling capacity 22 ~ 26%.

2. one according to claim 1 has the high-strength flatness viscose of light type, it is characterized in that: described pulp material comprises a kind of or two kinds and above combination in cotton pulp, bamboo pulp, wood pulp, jute pulp.

3. a kind of preparation method having the high-strength flatness viscose of light type according to any one of claim 1 or 2, is characterized in that: comprise the following steps:

4. a kind of preparation method having the high-strength flatness viscose of light type according to claim 3, it is characterized in that: in described steps A, the degree of polymerization is the sodium hydroxide solution dipping 50 ~ 90min of the pulp material concentration 110 ~ 240g/L of 650 ~ 1200, again through grinding, squeezing pulverize, rub after make slurry congee, slurry congee concentration be 30 ~ 40%.

5. a kind of preparation method having the high-strength flatness viscose of light type according to claim 3, it is characterized in that: in described step B, reactor is sent into after the sodium hydroxide solution that slurry congee and concentration are 140 ~ 200g/L mixes, using pure oxygen to fall the poly-rear acquisition degree of polymerization is the alkali cellulose of 400 ~ 600, in reactor, the addition of pure oxygen is 2 ~ 10%, falls the poly-reaction time to control at 30 ~ 60min.

6. a kind of preparation method having the high-strength flatness viscose of light type according to claim 3, it is characterized in that: in described step C, the sodium sulfite aqueous solution of described solvent comprises concentration to be 25 ~ 45 g/L sodium hydroxide solutions and concentration be 5 ~ 10 g/L; The addition of carbon disulfide is 25 ~ 37% of the fine content of first in the alkali cellulose that obtains of step B, and the concentration of the cellulose sulfonate solution of acquisition is 9.0 ~ 10.0%.

7. a kind of preparation method having the high-strength flatness viscose of light type according to claim 3, it is characterized in that: in described step D, spinning drawing step is as follows:

8. a kind of preparation method having the high-strength flatness viscose of light type according to claim 3, it is characterized in that: in described step D, post processing comprises desulfurization that the tow that formed spinning drawing carries out, bleaches and oil, and the desulfurizing agent that described desulfurization uses is made up of the sodium carbonate of concentration to be the vulcanized sodium of 4 ~ 8g/L and concentration be 1 ~ 4g/L; The hydrogen peroxide that the bleaching agent that described bleaching uses is concentration 0.3 ~ 0.6g/L; The described finish addition used that oils is 7 ~ 9g/L, and after oiling, the pH value of tow is 6.5 ~ 7.

9. a kind of preparation method having the high-strength flatness viscose of light type according to claim 7, it is characterized in that: described desulfurization temperature is 50 ~ 55 DEG C, desulfurization time is 2 ~ 3min; Described bleaching temperature is 50 ~ 55 DEG C, and bleaching time is 1 ~ 2min; The temperature of described finish is 50 ~ 55 DEG C.

10. a kind of preparation method having the high-strength flatness viscose of light type according to claim 8, it is characterized in that: described post processing also comprises oven dry, described oven dry is that desulfurization, the tow bleaching and obtain after oiling that the tow formed spinning drawing carries out makes to Tumble Dry, bake out temperature is 75 ~ 115 DEG C, after oven dry, obtain high-strength flatness viscose product.