CN110616466B - Regenerated cellulose strong yarn and preparation method thereof - Google Patents
Regenerated cellulose strong yarn and preparation method thereof Download PDFInfo
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- CN110616466B CN110616466B CN201910932601.9A CN201910932601A CN110616466B CN 110616466 B CN110616466 B CN 110616466B CN 201910932601 A CN201910932601 A CN 201910932601A CN 110616466 B CN110616466 B CN 110616466B
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- 239000004627 regenerated cellulose Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000009987 spinning Methods 0.000 claims abstract description 34
- 206010061592 cardiac fibrillation Diseases 0.000 claims abstract description 26
- 230000002600 fibrillogenic effect Effects 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims description 33
- 229920000433 Lyocell Polymers 0.000 claims description 26
- 229920002678 cellulose Polymers 0.000 claims description 24
- 239000001913 cellulose Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 230000001112 coagulating effect Effects 0.000 claims description 13
- 230000014759 maintenance of location Effects 0.000 claims description 12
- 230000015271 coagulation Effects 0.000 claims description 10
- 238000005345 coagulation Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 5
- LFTLOKWAGJYHHR-UHFFFAOYSA-N N-methylmorpholine N-oxide Chemical group CN1(=O)CCOCC1 LFTLOKWAGJYHHR-UHFFFAOYSA-N 0.000 claims 5
- 239000000835 fiber Substances 0.000 description 21
- 230000008569 process Effects 0.000 description 17
- 239000000243 solution Substances 0.000 description 17
- 229920003043 Cellulose fiber Polymers 0.000 description 9
- 239000007864 aqueous solution Substances 0.000 description 8
- 239000003431 cross linking reagent Substances 0.000 description 8
- 238000006116 polymerization reaction Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- WAZPLXZGZWWXDQ-UHFFFAOYSA-N 4-methyl-4-oxidomorpholin-4-ium;hydrate Chemical compound O.C[N+]1([O-])CCOCC1 WAZPLXZGZWWXDQ-UHFFFAOYSA-N 0.000 description 2
- 239000000427 antigen Substances 0.000 description 2
- 102000036639 antigens Human genes 0.000 description 2
- 108091007433 antigens Proteins 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009998 heat setting Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000007519 polyprotic acids Polymers 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 238000002166 wet spinning Methods 0.000 description 2
- LKLLNYWECKEQIB-UHFFFAOYSA-N 1,3,5-triazinane Chemical compound C1NCNCN1 LKLLNYWECKEQIB-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical group NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- YTYYEFNWTBPCBV-UHFFFAOYSA-N ClN1NC(=CC(=N1)Cl)O Chemical compound ClN1NC(=CC(=N1)Cl)O YTYYEFNWTBPCBV-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000003440 anti-fibrillation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/04—Dry spinning methods
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/06—Wet spinning methods
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/12—Stretch-spinning methods
- D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
Abstract
The invention provides a regenerated cellulose strong yarn, which has a fibrillation index less than or equal to 3; the invention also provides a preparation method of the regenerated cellulose strong yarn, which comprises the steps of preparing spinning solution, spinning and stretching; and (3) drawing, namely, passing the tows obtained by spinning through an air section, and then carrying out primary drawing, secondary drawing or more-stage drawing. The regenerated cellulose strong yarn prepared by the invention can meet the requirements of high strength, high modulus and low fibrillation, and the dry breaking strength of the prepared regenerated cellulose is 4.5-6.0 cN/dtex, the wet breaking strength is 3.8-5.5 cN/dtex, the dry modulus is more than or equal to 90cN/dtex, and the fibrillation index is less than or equal to 3.
Description
Technical Field
The invention belongs to the field of fiber manufacturing, and relates to a regenerated cellulose strong yarn and a preparation method thereof.
Background
The regenerated cellulose fiber prepared by taking NMMO as a solvent has the advantages of high strength and modulus, especially high wet strength and wet modulus, similar dry and wet strength, good dimensional stability, good heat resistance, environment-friendly production process and the like; however, the fibrillated nature of Lyocell fibers presents problems not only for dyeing, wearing and washing of fabrics; but also can influence the application stability of the Lyocell fiber as the industrial high-strength yarn.
At present, aiming at the problem that Lyocell fibers are easy to fibrillate, the fibers are mainly subjected to post-treatment, and alkali liquor, resin and a crosslinking agent are mainly used for treating the fibers. The method realizes the industrial production of the Lyocell fiber with the anti-fibrillation performance.
Patent CN95192563.6A reports that a crosslinking agent having three acrylamide groups, preferably 1,3, 5-triacrylate hexahydro-1, 3, 5-triazine, reacts with wet solution spun cellulose fibers to reduce their tendency to fibrillate. Patent CN98801507.2A reports a method of reducing the fibrillation tendency of solution spun cellulose fibers with a textile auxiliary having two reactive groups, preferably a cross-linking agent of the sodium salt of 2, 4-dichloro-6-hydroxytriazine. However, the cross-linking agents used in these processes are complicated to synthesize and expensive, and the cross-linking agents are not easy to store for a long time and are easy to hydrolyze during use, thereby affecting the efficiency of the cross-linking reaction and the effect of the fibrillation resistance of the fibers.
Patent CN103306136A reports a cross-linking agent composition, which is prepared by mixing oligomeric polybasic acid with molecular weight of 400-1000 and C2-C6 polybasic acid in a certain proportion, and solves the problems of complex synthesis, high price, difficult storage and easy hydrolysis of the cross-linking agent, but in the process of treating the fiber, the treatment temperature is high, the treatment time is long, and the mechanical properties of the fiber are greatly affected.
EP-A-494851 describes ｃA process for drawing extruded and coagulated cellulose which is substantially stress-free, in which process the point is that the freshly extruded filaments are not drawn; this process is similar to a plastic deformation process in which the starting material, i.e., undrawn Lyocell filaments, has a rubbery consistency. However, the mechanical properties of the fibers produced according to the process of this patent do not meet the requirements of today.
Patent CN100410430C provides a method for post-drawing Lyocell fiber, which is to post-draw the filament after passing through an air zone and coagulating and drawing in a coagulating bath, and then drawing the filament under a certain tension under heat treatment conditions, which can improve the textile properties of Lyocell fiber, increase the mechanical strength, especially the wet modulus of the fiber, to 350CN/tex, but as a cellulose strong yarn, the mechanical properties are not satisfactory, and the problem of fibrillation of cellulose fiber is not improved.
Literature studies have shown that Lyocell spinning processes, including dope concentration, coagulation bath temperature concentration, air space length, spinning speed and draw ratio, all have an effect on the fibrillation of Lyocell fibers. The aim of reducing the fibrillation of the Lyocell fibers can be achieved by adjusting the spinning process conditions, but the mechanical property of the fibers can be influenced, the fibrillation cannot be reduced, and the Lyocell fibers with higher strength and modulus can be obtained.
In summary, the method for improving the fiber antigen capability of the Lyocell fiber in the prior art has the following technical problems:
(1) the method adopting the cross-linking agent for treatment has the advantages of high treatment temperature, long treatment time, great influence on the mechanical properties of the fibers, reduction in the mechanical properties of the fibers such as breaking strength and elongation; meanwhile, the high-temperature crosslinking treatment makes the fiber become hard and brittle and loses the original softness.
(2) The fibrillation of the Lyocell fiber can be reduced by adjusting the spinning process, but the mechanical property of the fiber is influenced at the same time, and the technology of simultaneously meeting the requirements of high strength, high modulus and antigen fibrillation is not reported.
Disclosure of Invention
In order to solve the defects in the prior art, the invention adopts a novel spinning technical method and a two-stage stretching dry-jet wet spinning process to prepare the Lyocell fiber strong yarn, and realizes the following purposes:
(1) improving the strength and modulus of the Lyocell fiber;
(2) reducing the degree of fibrillation of the Lyocell fibers;
(3) the soft performance of the Lyocell fiber is maintained.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the regenerated cellulose strong yarn has dry state breaking strength of 4.5-6.0 cN/dtex, wet state breaking strength of 3.8-5.5 cN/dtex, dry state modulus not less than 90cN/dtex, and fibrillation index not more than 3.
The following is a further improvement of the above technical solution:
the regenerated cellulose strong yarn is Lyocell fiber.
A preparation method of regenerated cellulose strong yarn comprises the following steps:
(1) preparation of the spinning solution
Cellulose pulp with the polymerization degree of 400-1200 and NMMO solution are mixed, dehydrated and dissolved to prepare cellulose spinning solution with the concentration of 5-14%.
The degree of polymerization of the cellulose pulp is preferably 500-600;
the concentration of the NMMO solution is preferably 45-55 wt%;
the content of cellulose in the spinning solution is preferably 8-12%, the NMMO content is 76-80%, and the water content is 10-14%.
(2) Spinning
Then extruding the mixture through a spinneret orifice to carry out spinning; the diameter of the spinneret orifice is 0.05mm-0.2mm, preferably 0.1mm, and the spinning temperature is 85-105 ℃, preferably 85-95 ℃.
(3) Stretching
Passing through an air section, a first stage of stretching and a second stage of stretching;
the length of the air section is 10-300mm, preferably 50-100mm, and the residence time of the air section is 0.03-4.0s, preferably 0.3-0.6 s.
The process conditions of the first stage drawing are as follows: the coagulating bath is an NMMO aqueous solution with the mass concentration of 0-40%, the temperature of the coagulating bath is 0-30 ℃, the stretching ratio is 1-10 times, the retention time is 0.05-25s, and the one-roll stretching speed is 5-20 m/min; the first-stage drawn yarn is obtained by the following three components: NMMO 15-40%, cellulose 5-25%, water 45-60%, strength 1.1-2.3cN/dtex, elongation at break 20-55%, birefringence 0.021-0.055.
Preferably: the coagulating bath is 18-25% NMMO water solution, the temperature of the coagulating bath is 20-22 deg.C, the stretching time is 3-4 times, the retention time is 0.1-1.5s, and the one-roll stretching speed is 8-12 m/min; the first-stage drawn yarn is obtained by the following three components: NMMO 29-36%, cellulose 10-15%, water 54-56%, strength 1.75-1.95cN/dtex, elongation at break 20-22%, birefringence 0.032-0.04.
The residence time in the first stage drawing is further preferably 0.1 s.
The second-stage stretching process conditions are as follows: the coagulating bath is NMMO aqueous solution with mass concentration of 0-30%, the temperature is 0-60 ℃, the stretching magnification is 1-5 times, the retention time is 2-12s, and the two-roller stretching speed is 10-60 m/min; the obtained second-stage drawn yarn comprises the following three components in percentage by weight: NMMO: 5% -15%, cellulose: 12% -45%, water: 40-80%, strength of 3.0-5.3cN/dtex, elongation at break of 10-25%, and birefringence of 0.035-0.072.
Preferably: the second-stage stretching process conditions are as follows: the coagulating bath is 10% NMMO water solution, the temperature is 15-20 ℃, the stretching ratio is 2-2.5 times, the retention time is 5s, and the two-roller stretching speed is 20-25 m/min;
the obtained second-stage drawn yarn comprises the following three components in percentage by weight: NMMO: 10% -12%, cellulose: 12% -21%, water: 67-78%, strength 4.4-4.7cN/dtex, elongation at break 15-17%, and birefringence index 0.059-0.063.
(4) Post-treatment
Carrying out water washing, hot stretching and heat setting on the fiber obtained by the second-stage or more stretching, wherein the obtained fiber titer is 1.0-5.0 dtex, the dry strength is 4.5-6.0 cN/dtex, the wet strength is 3.8-5.5 cN/dtex, the dry modulus is more than or equal to 90cN/dtex, the elongation at break is 5-15%, the birefringence is 0.045-0.086, and the fibrillation index is less than or equal to 3; preferably, the fiber fineness is 2-2.3dtex, the dry strength is 4.7-4.9 cN/dtex, the wet strength is 3.8-4.1 cN/dtex, the dry modulus is 93-96cN/dtex, the elongation at break is 12-14%, the birefringence index is 0.073-0.075, and the fibrillation index is 2-3.
A regenerated cellulose strong yarn is prepared by extruding cellulose solution from a spinneret orifice, entering a coagulating bath through an air gap section, performing primary drawing, and then continuously performing secondary or more-stage drawing to obtain high-strength, high-modulus and low-fibrillation regenerated cellulose fibers; the high-strength yarn is prepared by a two-stage drawing dry-jet wet spinning process, compared with a primary drawing process, the secondary drawing is increased, the process condition of the first-stage drawing is changed, the fibrillation index of the fiber is reduced, and the drawing performance of the Lyocell solidified yarn in the second-stage drawing is improved. In the first stage drawing process, the stress borne by the filament and the orientation degree of the filament are reduced by adopting lower drawing multiplying power and spinning speed in the first stage drawing process, so that the fibrillation index of the filament is reduced, and the re-drawing capability of the fiber in the second stage is improved; the higher concentration of the first coagulation bath and the shorter coagulation time are adopted, the residual quantity of NMMO in the Lyocell coagulated filament is improved, the interaction among cellulose molecules is weakened, and the redrawing performance of the Lyocell coagulated filament in the second section is ensured; in the second stage drawing process, the concentration and the temperature of the second coagulating bath and the drawing ratio in the second stage are adjusted, so that the Lyocell coagulated filaments are further drawn and completely coagulated and formed, the orientation degree of the Lyocell fibers is improved, and the strength and the modulus of the fibers are improved.
Compared with the prior art, the invention has the following beneficial effects:
(1) the regenerated cellulose fiber prepared by the invention has higher strength and modulus, and can meet the performance requirements of cellulose strong yarn:
the titer of the regenerated cellulose fiber prepared by the invention is 1.0-5.0 dtex, the dry strength is 4.5-6.0 cN/dtex, the wet strength is 3.8-5.5 cN/dtex, the dry modulus is more than or equal to 90cN/dtex, the elongation at break is 5-15%, and the birefringence is 0.045-0.086.
(2) The regenerated cellulose fiber prepared by the method meets the requirements of high strength and high modulus, simultaneously reduces the fibrillation degree of the fiber, and the fibrillation index is less than or equal to 3.
(3) The preparation method of the regenerated cellulose strong yarn can be used for preparing the regenerated cellulose strong yarn with low fibrillation, and the application field of the regenerated cellulose fiber is expanded and enriched.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1A method for preparing regenerated cellulose strong yarn
The method comprises the following steps:
(1) preparation of the spinning solution
And mixing, dehydrating and dissolving the cellulose pulp with the polymerization degree of 540 and the NMMO aqueous solution with the mass concentration of 50% to obtain a spinning solution.
The spinning solution contained 10% cellulose, 78% NMMO and 12% water.
(2) Spinning
Then extruding the mixture through a spinneret orifice to carry out spinning;
the diameter of the spinneret plate is 0.1mm, and the spinning temperature is 90 ℃.
(3) Stretching
Passing through an air section, a first stage of stretching and a second stage of stretching;
the length of the air section is 50mm, and the retention time of the air section is 0.3 s;
the first-stage stretching is carried out, wherein a coagulation bath is an NMMO (N-methyl-MO) aqueous solution with the mass concentration of 20%, the temperature of the coagulation bath is 20 ℃, the stretching ratio is 3 times, the retention time is 0.1s, and the one-roll stretching speed is 10 m/min; obtaining a first-stage drawn yarn, wherein the contents of three components are as follows: 36% of NMMO, 10% of cellulose, 54% of water, 1.75cN/dtex of strength, 22% of elongation at break and 0.032 of birefringence.
And the second-stage drawing and coagulating bath is an NMMO aqueous solution with the mass concentration of 10%, the temperature is 20 ℃, the drawing ratio is 2.5 times, the retention time is 5s, the two-roller drawing speed is 25m/min, and second-stage drawn yarns are obtained, wherein the contents of three components are as follows: NMMO10%, cellulose 12%, water 78%, strength 4.4cN/dtex, elongation at break 17%, birefringence 0.059.
(4) Post-treatment
Then washing, hot stretching and heat setting are carried out to obtain the regenerated cellulose strong yarn;
the fineness of the finally prepared regenerated cellulose strong yarn is 2.3dtex, the dry breaking strength is 4.7cN/dtex, the wet breaking strength is 3.8cN/dtex, the dry modulus is 93cN/dtex, the breaking elongation is 14%, the birefringence is 0.073, and the fibrillation index is 2.
Example 2 preparation method of regenerated cellulose strong yarn
The method comprises the following steps:
(1) preparation of the spinning solution
Mixing cellulose pulp with the polymerization degree of 540 and an NMMO aqueous solution with the mass concentration of 50% for dehydration and dissolution to obtain a spinning solution;
the spinning solution contained 10% cellulose, 78% NMMO and 12% water.
(2) Spinning
Then extruding through a spinneret orifice to carry out spinning;
the diameter of the spinneret plate is 0.1mm, and the spinning temperature is 90 ℃.
(3) Stretching
Then, the air section, the first-stage stretching and the second-stage stretching are carried out;
the length of the air section is 100mm, and the retention time of the air section is 0.6 s;
first-stage stretching, wherein a coagulation bath is an NMMO aqueous solution with the mass concentration of 20%, the temperature of the coagulation bath is 20 ℃, the stretching ratio is 4 times, the retention time is 0.1s, the one-roll stretching speed is 10m/min, and first-stage stretched yarns are obtained, and the three components comprise: 29 percent of NMMO, 15 percent of cellulose, 56 percent of water, 1.93cN/dtex of strength, 20 percent of elongation at break and 0.037 percent of birefringence.
And (3) second-stage stretching: the coagulating bath is an NMMO aqueous solution with the mass concentration of 10%, the temperature is 15 ℃, the stretching ratio is 2 times, the residence time is 5s, the two-roller stretching speed is 20m/min, and the second-stage stretched yarn is obtained, wherein the contents of the three components are as follows: NMMO 12%, cellulose 21%, water 67%, strength 4.7cN/dtex, elongation at break 15%, birefringence 0.063.
(4) Post-treatment
Then washing, hot stretching and hot setting spinning are carried out to obtain the regenerated cellulose strong yarn.
The fineness of the finally prepared regenerated cellulose strong yarn is 2.03dtex, the dry breaking strength is 4.9cN/dtex, the wet breaking strength is 4.1cN/dtex, the dry modulus is 96cN/dtex, the breaking elongation is 12%, the birefringence is 0.075, and the fibrillation index is 3.
Comparative example 1
On the basis of example 1, the total draw ratio is unchanged, only the first stage drawing is adopted, the second stage drawing is not adopted, the draw ratio is 7.5 times, and the prepared lyocell fiber has the following indexes: the fineness of the strong yarn is 2.3dtex, the dry breaking strength is 3.9cN/dtex, the wet breaking strength is 3.3cN/dtex, the dry modulus is 68cN/dtex, the elongation at break is 15%, the birefringence is 0.067, and the fibrillation index is 5.
Comparative example 2
On the basis of example 1, the primary stretching of the prior art is adopted: the length of the air zone was 50mm, the residence time was 0.15s, the coagulation bath concentration was 20%, the coagulation bath temperature: the indexes of the ordinary lyocell fiber prepared by the method with the drawing ratio of 8 times at 25 ℃ are as follows: the fineness of the strong yarn is 2.03dtex, the dry breaking strength is 4.0cN/dtex, the wet breaking strength is 3.4cN/dtex, the dry modulus is 70cN/dtex, the elongation at break is 13%, the birefringence is 0.069, and the fibrillation index is 6.
Claims (6)
1. The preparation method of the regenerated cellulose strong yarn is characterized in that the fibrillation index of the regenerated cellulose strong yarn is less than or equal to 3;
the preparation method of the regenerated cellulose strong yarn comprises the steps of preparing spinning solution, spinning and stretching; the drawing, the tow obtained by spinning passes through an air section, and then the first-stage drawing, the second-stage drawing or the drawing of more stages is carried out;
the regenerated cellulose strong yarn is Lyocell fiber;
and the first-stage drawing is to obtain a first-stage drawn yarn with the composition of NMMO: 15wt% -40wt%, cellulose: 5% -25%, water: 45% -60%; the first-stage drawn yarn has the strength of 1.1-2.3cN/dtex, the elongation at break of 20-55 percent and the birefringence of 0.021-0.055;
the second stage of stretching, wherein the concentration of NMMO in a coagulating bath is 0wt% -30wt%, the temperature is 0-60 ℃, the stretching ratio is 1-5 times, the two-roller stretching speed is 10-60m/min, and the retention time is 2.0-12 s;
and performing secondary drawing to obtain a secondary drawn yarn with the composition of NMMO: 5wt% -15wt%, cellulose: 12% -45%, water: 40% -80%; the second-stage drawn yarn has the strength of 3.0-5.3cN/dtex, the elongation at break of 10-25 percent and the birefringence of 0.035-0.072.
2. The method for preparing the regenerated cellulose strong yarn according to claim 1, wherein the regenerated cellulose strong yarn has a dry strength of 4.5-6.0 cN/dtex, a wet strength of 3.8-5.5 cN/dtex, and a dry modulus of 90cN/dtex or more.
3. The method for preparing regenerated cellulose strong yarn according to claim 1, characterized in that the tow obtained by drawing and spinning is passed through an air section and then subjected to first drawing and second drawing; the length of the air section is 10-300mm, and the retention time is 0.03-4.0 s.
4. The method of claim 3, wherein the NMMO concentration in the coagulation bath in the first stage drawing is 0wt% to 40wt%, the temperature is 0 to 30 ℃, the drawing ratio is 1 to 10 times, the one-roll drawing speed is 5 to 20m/min, and the retention time is 0.05 to 25 s.
5. The method of claim 1, wherein the spinning solution comprises 5% to 14% cellulose, 75% to 80% NMMO, and the balance water.
6. The method of claim 1, wherein the spinning temperature is 85-105 ℃, and the diameter of the spinneret orifice is 0.05mm-0.2 mm.
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Effective date of registration: 20221020 Address after: 261106 north of Xinsha Road, Guti street, Hanting District, Weifang City, Shandong Province Patentee after: Weifang Xinlong biomaterials Co.,Ltd. Patentee after: DONGHUA University Address before: 261100 building 89, 1825 Hailong Road, Hanting District, Weifang City, Shandong Province Patentee before: HENGTIAN HAILONG (WEIFANG) NEW MATERIALS CO.,LTD. Patentee before: DONGHUA University |