阅读说明：本技术 一种涡流纺用纤维素纤维及其制备方法 (Cellulose fiber for vortex spinning and preparation method thereof ) 是由 王春利 占景炼 赵伟 叶华安 朱利民 郑文轩 刘兰燕 王兵 蔡志超 张文涛 于 2021-09-13 设计创作，主要内容包括：本发明公开一种涡流纺用纤维素纤维及其制备方法,其特征在于,所述涡流纺用纤维素纤维的制备方法包括：浆粕原料筛选、浸渍、辅助浸渍、压榨、老成、黄化溶解、过滤熟成、脱泡、纺丝、牵伸、切断、精炼及后处理、烘干和打包。本发明通过原料研究、碱纤维素制备中增加辅助浸渍、纤维素磺酸酯多次研磨均质化、油剂改进等方法,制备出干断裂强度远大于国家标准GB/T 114463-2008中棉型干断裂强度≥2.1cN/dtex,湿断裂强度也远大于国家标准度≥1.2cN/dtex的纤维素纤维,并且所得纤维的摩擦系数较低,涡流纺纱断头少,纺织的纱线棉结低,强度高,并且纺纱速度较高,节约了纺纱成本。(The invention discloses a cellulose fiber for vortex spinning and a preparation method thereof, and is characterized in that the preparation method of the cellulose fiber for vortex spinning comprises the following steps: screening pulp raw materials, dipping, auxiliary dipping, squeezing, ageing, yellowing and dissolving, filtering and ripening, defoaming, spinning, drafting, cutting, refining and post-processing, drying and packaging. According to the invention, by means of raw material research, methods of adding auxiliary impregnation in alkali cellulose preparation, cellulose sulfonate repeated grinding homogenization, oil solution improvement and the like, the cellulose fiber with the dry breaking strength far larger than the cotton type dry breaking strength of more than or equal to 2.1cN/dtex in national standard GB/T114463-2008 and the wet breaking strength far larger than the national standard degree of more than or equal to 1.2cN/dtex is prepared, the friction coefficient of the obtained fiber is lower, the broken ends of vortex spinning are fewer, the spun yarn neps are low, the strength is high, the spinning speed is higher, and the spinning cost is saved.)

1. A method of preparing cellulose fibers for vortex spinning, comprising:

screening pulp raw materials, dipping, auxiliary dipping, squeezing, ageing, yellowing and dissolving, filtering and curing, defoaming, spinning, drafting, cutting, refining, post-processing, drying and packaging;

wherein:

(1) screening pulp raw materials: and (2) mixing hardwood pulp and softwood pulp according to the mass ratio of 100: 5-15 mixing;

the content of alpha cellulose in the hardwood pulp is more than or equal to 96 percent, the pentosan is less than or equal to 2.0 percent, the resin is less than or equal to 0.1 percent, the silicon dioxide is less than or equal to 30ppm, the iron is less than or equal to 6ppm, and the calcium is less than or equal to 60 ppm;

the content of alpha cellulose in the softwood pulp is more than or equal to 94 percent, the pentosan is less than or equal to 2.0 percent, the resin is less than or equal to 0.2 percent, the silicon dioxide is less than or equal to 40ppm, the iron is less than or equal to 5ppm, and the calcium is less than or equal to 60 ppm;

(2) auxiliary impregnation: intermittently feeding, continuously discharging, and continuously stirring in auxiliary impregnation process at 45-55 deg.C for 20-30 min;

(3) the cellulose sulfonate is subjected to coarse grinding and fine grinding in the yellowing dissolving process, and the coarse grinding gap is 2.0-3.0 mm; the fine grinding adopts a circulating continuous grinding pump, and the grinding gap is 0.5-1.0 mm;

(4) the refining and post-treatment comprises the following steps: washing with water, desulfurizing, washing with water twice, bleaching, washing with water three times, pickling and oiling;

the oiling temperature is 55-65 ℃, the oil bath concentration for oiling is 5-12g/L, and the oil bath circulation volume is 45-55m³H, the PH value of the oil bath is 6.0-7.0;

the effective components of the oil agent in the oil bath comprise a lubricant, an antistatic agent, a PH control agent and an antioxidant;

the oil applying oil bath is prepared from the following raw materials in percentage by mass: 60-80% of water, 10-30% of lubricant, 5-10% of emulsifier, 5-15% of antistatic agent, 1-3% of pH regulator and 0.5-5% of antioxidant.

2. The preparation method according to claim 1, wherein:

the hardwood pulp is selected from one or more of eucalyptus, acacia and birch with the tree age of 3-7 years;

the tree species of the softwood pulp is selected from one or more of spruce, fir and Jersey pine with the tree species age of 8-15 years.

3. The preparation method according to claim 1, wherein:

the alkali cellulose squeezed by the squeezer contains 30.0-40.0% of methyl fiber and 15.0-20.0% of alkali.

4. The preparation method according to claim 1, wherein:

CS in the etiolation solution₂The addition amount of the alpha-cellulose is 30-35 percent relative to the alpha-cellulose, the etiolation time is 30-50min, the concentration of the dissolved alkali is 7.0-10.0g/l, and the temperature of the dissolved alkali is 3-10 ℃.

5. The preparation method according to claim 1, wherein:

and filtering the squeezed alkali liquor by a rotary drum filter, and removing impurities by microfiltration and ultrafiltration.

6. The preparation method according to claim 1, wherein:

the filtration precision of the rotary drum filter is 60-120 meshes, the aperture of the micro-rate membrane is 0.1-50 mu m, and the aperture of the ultrafiltration membrane is 10-80 nm;

the recovery rate of the pressed alkali is 100%.

7. The preparation method according to claim 1, wherein:

the spinning solution for spinning contains 9.0-12.0% of methyl fiber, 4.0-5.0% of alkali, 20-30 ℃ of temperature, 35-45S of viscosity and 15-20ml of ripening degree.

8. The preparation method according to claim 1, wherein:

the spinning method is wet spinning, and the highest spinning speed of the spinning method reaches 79 m/min;

three forming and three drafting processes are needed in the spinning forming process;

the components of the forming bath for spinning comprise sulfuric acid, sodium sulfate and zinc sulfate;

the first molding process parameters are as follows: the temperature is 45-55 ℃, the concentration of sulfuric acid is 100-120g/l, and the concentration of zinc sulfate is 8.0-11.0 g/l;

the second molding process parameter is as follows: the temperature is 65-75 ℃, and the concentration of sulfuric acid is 50-60 g/l;

the third drafting forming process parameter: the temperature is 75-85 ℃, and the concentration of sulfuric acid is 35-45 g/l;

the draft ratios of the three drafts are respectively 45% -55%, 10% -15% and 35% -45%.

9. The preparation method according to claim 1, wherein:

the lubricant in the oil bath is one or more of polyoxyethylene alkyl ether, fatty acid ester containing lateral hydroxyl, epoxy ethane polyether containing hydroxyl and modified mineral oil containing hydroxyl;

the emulsifier is one or more of alkyl sodium sulfonate, clary sulfated oil, fatty alcohol sodium sulfate and amino sulfate;

the antistatic agent is one or more of dodecyl benzyl dimethyl ammonium chloride, sodium p-nonylphenoxy propane sulfonate, glycerol mono fatty acid ester, sodium butyrate sulfonate and alkyl bis (ethylhydroxyethylamine) phosphate;

the pH regulator is an organic pH buffer solution, and the pH of the organic pH buffer solution is 4.0-6.5;

the antioxidant is one or two of 2- (2-hydroxy-3, 5-bis [1, 1-dimethylphenyl ]) -benzotriazole and triethylene glycol bis [ beta (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate ].

10. A cellulose fiber for vortex spinning produced by the production method according to any one of claims 1 to 9, wherein:

the titer of the cellulose fiber for vortex spinning is 1.10-1.67dtex, the dry breaking strength is more than or equal to 2.65cN/dtex, the wet breaking strength is more than or equal to 1.30cN/dtex, the defect is less than or equal to 0.5mg/100g, the oil content is 0.25-0.45%, the static friction coefficient of the fiber is 0.12-0.28, and the dynamic friction coefficient is 0.08-0.20.

Technical Field

The invention discloses a preparation method of cellulose fiber for vortex spinning and the cellulose fiber for vortex spinning prepared by the preparation method, and belongs to the field of vortex spinning.

Background

The cellulose fiber has good air permeability, sweat absorption, softness, good dyeing property and the like, and is an indispensable raw material in the textile industry. With the improvement of environmental awareness, cellulose fibers made of natural and renewable pulp are more popular, and the types and application range of downstream customers are expanded. Although the production technology of the cellulose fiber is mature, the product quality is stable, the differentiation degree is small, and especially, the cellulose fiber specially tailored for the downstream is lacked. With the continuous expansion of the global cellulose fiber production energy, the market competition of the cellulose fiber is fierce, and the development of targeted cellulose fiber products according to the production process and the product characteristics of customers becomes the development trend in the future.

One of the applications of the cellulose fiber is vortex spinning, which is to introduce the fiber bundle into a vortex chamber under the driving of airflow without adding twist, draw the fiber bundle into a yarn channel in a spindle under the dragging action of formed yarns at the front end of the fiber bundle, and twist the fiber bundle into newly formed yarns to form yarn cores; the tail end of the fiber is still kept in the fiber guide channel under the condition of being held by the front roller jaw, when the tail end of the fiber is not held by the front roller jaw any more, the tail end of the fiber is not held in the fiber guide channel any more under the centrifugal action of the air vortex in the spinning nozzle, but is radially dispersed by the rotating airflow at the spindle inlet, and is laid down on the conical surface of the front end of the spindle under the driving of the air vortex, and simultaneously revolves along with the air vortex, and is wound on the following yarn and is output through the channel of the yarn in the spindle. Vortex spinning is carried out under the driving of airflow, and has higher requirements on fiber strength and surface friction.

In the prior art, the strength of viscose fibers is improved by increasing or changing the process flow, although the method is higher than the common viscose fibers, the method does not improve the friction force of the fiber surface, and a plurality of processes such as grinding, kneading and the like are added, so that the direct production cannot be carried out on the basis of the original production line. The high-strength viscose fiber is prepared by adding the additive, adopting the modified melamine-formaldehyde resin as the reinforcing agent and quickly blending the modified melamine-formaldehyde resin with the viscose solution, although the strength of the viscose fiber is greatly improved compared with that of the common viscose fiber, the degradable performance of the fibril cellulose fiber is broken by adding the modified melamine-formaldehyde resin, the stability of the spinning solution is not easy to control, and the industrial production is difficult to realize. Compared with the common cellulose fiber, the cellulose fiber for vortex spinning needs to improve the strength and reduce the surface friction of the fiber, and the prior art does not simultaneously meet the two indexes.

Based on the above analysis, a method for preparing cellulose fiber for vortex spinning which has both strength and fiber surface friction, and cellulose fiber for vortex spinning are urgently needed in the industry at present.

Disclosure of Invention

In order to solve the technical problems, the invention discloses a preparation method of cellulose fiber for vortex spinning, which improves the fiber strength by researching pulp raw materials and improving the quality of spinning solution, and reduces the fiber friction force by adjusting the preparation method and the proportion of an oil solution, thereby preparing the cellulose fiber more used for vortex spinning.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

a cellulose fiber for vortex spinning and a preparation method thereof are characterized in that the preparation method of the cellulose fiber for vortex spinning comprises the following steps: screening pulp raw materials, dipping, auxiliary dipping, squeezing, ageing, yellowing and dissolving, filtering and ripening, defoaming, spinning, drafting, cutting, refining and post-processing, drying and packaging.

Further, the pulp raw material consists of hardwood pulp and softwood pulp, and the mass ratio of the hardwood pulp to the softwood pulp is 100: 5-15; wherein the content of alpha cellulose in the hardwood pulp is more than or equal to 96 percent, the content of pentosan is less than or equal to 2.0 percent, the content of resin is less than or equal to 0.1 percent, the content of silicon dioxide is less than or equal to 30ppm, the content of iron is less than or equal to 6ppm, and the content of calcium is less than or equal to 60 ppm; the content of alpha cellulose in the softwood pulp is more than or equal to 94 percent, the pentosan is less than or equal to 2.0 percent, the resin is less than or equal to 0.2 percent, the silicon dioxide is less than or equal to 40ppm, the iron is less than or equal to 5ppm, and the calcium is less than or equal to 60 ppm.

Further, the auxiliary dipping of the dipping is intermittent feeding and continuous discharging, the stirring is continuously carried out in the auxiliary dipping process, the auxiliary temperature is 53-56 ℃, and the time is 25-30 min.

Further, the cellulose sulfonate is subjected to coarse grinding and fine grinding in the yellowing dissolving process, wherein the coarse grinding gap is 2.0-3.0 mm; the fine grinding adopts a circulating continuous grinding pump, and the grinding gap is 0.5-1.0 mm.

Further, the refining and post-treatment comprises primary washing, desulfurization, secondary washing, bleaching, tertiary washing, acid washing and oiling, wherein the oiling temperature is 55-65 ℃, the concentration of an oil bath for oiling is 5-12g/L, and the circulation volume of the oil bath is 45-55m³The PH value of the oil bath is 6.0-7.0, the effective components of the oil agent in the oil bath comprise 60-80% of water, 10-30% of lubricant, 5-10% of emulsifier, 5-15% of antistatic agent, 1-3% of PH regulator and 0.5-5% of antioxidant according to the mass ratio.

Further, the hardwood pulp has tree age of 3-7 years, and the tree species is selected from one or more of eucalyptus, acacia and birch; the tree age of the softwood pulp is 8-15 years, and the tree species are selected from one or more of spruce, fir and Jersey pine.

Further, the alkali cellulose squeezed by the squeezer contains 30.0-40.0% of methyl fiber and 15.0-20.0% of alkali.

Further, the yellowing dissolves CS₂The addition amount of the alpha-cellulose is 30-35 percent relative to the alpha-cellulose, the etiolation time is 30-50min, the concentration of the dissolved alkali is 7.0-10.0g/l, and the temperature of the dissolved alkali is 3-10 ℃.

Further, the squeezed alkali liquor is filtered by a rotary drum filter, and impurities such as hemicellulose and the like in the squeezed alkali liquor are removed by microfiltration and ultrafiltration.

Furthermore, the filtration precision of the rotary drum filter is 60-120 meshes, the aperture of the micro-rate membrane is 0.1-50 mu m, the aperture of the ultrafiltration membrane is 10-80nm, and the recovery rate of the pressed alkali is 100%.

Further, the spinning solution for spinning contains 9.0-12.0% of methyl fiber, 4.0-5.0% of alkali, 20-30 ℃ of temperature, 35-45S of viscosity and 15-20ml of ripening degree.

Furthermore, the spinning method is wet spinning, and the highest spinning speed reaches 79 m/min; the spinning forming process needs three forming and three drafting processes, the forming bath of the spinning comprises sulfuric acid, sodium sulfate and zinc sulfate, and the first forming process parameters are as follows: the temperature is 45-55 ℃, the concentration of sulfuric acid is 100-120g/l, and the concentration of zinc sulfate is 8.0-11.0 g/l; the second molding process parameter is as follows: the temperature is 65-75 ℃, and the concentration of sulfuric acid is 50-60 g/l; the third drafting forming process parameter: the temperature is 75-85 ℃, and the concentration of sulfuric acid is 35-45 g/l; the draft ratios of the three drafts are respectively 45% -55%, 10% -15% and 35% -45%.

Further, the lubricant in the oil bath is one or more of polyoxyethylene alkyl ether, lateral hydroxyl-containing fatty acid ester, hydroxyl-containing ethylene oxide polyether and hydroxyl modified mineral oil; the emulsifier is one or more of sodium alkyl sulfonate, clary sulfated oil, fatty alcohol sodium sulfate and amino sulfate, and the antistatic agent is one or more of dodecyl benzyl dimethyl ammonium chloride, sodium p-nonylphenoxypropane sulfonate, glycerol mono fatty acid ester, sodium butyrate sulfonate and alkyl bis (ethylhydroxyethylamine) phosphate; the pH regulator is an organic pH buffer solution, and the pH of the organic pH buffer solution is 4.0-6.5; the antioxidant is one or two of 2- (2-hydroxy-3, 5-bis [1, 1-dimethylphenyl ]) -benzotriazole and triethylene glycol bis [ beta (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate ].

The invention also discloses a cellulose fiber for vortex spinning prepared by any one of the preparation methods, wherein the titer of the cellulose fiber for vortex spinning is 1.10-1.67dtex, the dry breaking strength is more than or equal to 2.65cN/dtex, the wet breaking strength is more than or equal to 1.30cN/dtex, the defects are less than or equal to 0.5mg/100g, the oil content is 0.25-0.45%, the static friction coefficient of the fiber is 0.12-0.28, and the dynamic friction coefficient is 0.08-0.20.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the pulp raw material used in the invention has specific proportion and performance conditions, so that the prepared cellulose has high stability. An auxiliary impregnation process, a cellulose sulfonate two-grinding process and a three-section forming bath are added in the preparation process of the alkali cellulose for forming, so that the defects that the traditional alkali cellulose is uneven in performance, subsequent aging oxidation degradation and alkali cellulose yellowing cannot be performed uniformly, the uniformity of spinning solution is poor, the strength of fibers is low and the like are overcome. In the aspect of using the oil agent, hydroxylation modification is adopted, the intermolecular force between the oil agent and hydroxyl on a hydroxyl chain of cellulose fibers is increased, and a pH buffer reagent and an antioxidant are added into the oil agent, so that the loss of the fibers in a drying section after being oiled is reduced, and the loss of the fiber washing oil agent is reduced. Finally, the technical effects that the dry breaking strength of the fiber is far greater than that of cotton in the national standard GB/T114463-2008 and is not less than 2.1cN/dtex, the wet breaking strength is also far greater than that of the national standard and is not less than 1.2cN/dtex, the friction coefficient of the obtained fiber is lower, the broken ends of the vortex spinning are few, the neps of the spun yarn are low, the strength is high, the spinning speed is higher, and the spinning cost is saved are achieved.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Example 1

A cellulose fiber for vortex spinning and a preparation method thereof comprise: screening pulp raw materials, dipping, auxiliary dipping, squeezing, ageing, yellowing and dissolving, filtering and ripening, defoaming, spinning, drafting, cutting, refining and post-processing, drying and packaging;

(1) screening pulp raw materials: the pulp raw material consists of hardwood pulp and softwood pulp, the tree species of the hardwood pulp is eucalyptus, and the age of the eucalyptus is 5 years; the tree species of the softwood pulp is a mixture of spruce and fir, and the tree ages of the spruce and the fir are 12 years; the mass ratio of the hardwood pulp to the softwood pulp is 100: 8, the content of alpha cellulose in the hardwood pulp is 98.5 percent, the pentosan is 0.8 percent, the resin is 0.09 percent, the silicon dioxide is 11ppm, the iron is 3ppm, and the calcium is 23 ppm; the content of alpha cellulose in the softwood pulp is 96.7%, pentosan is 1.2%, resin is 0.12%, silicon dioxide is 14ppm, iron is 3ppm, and calcium is 32 ppm;

(2) dipping: adding the pulp in the step (1) into an impregnation barrel, wherein the mass ratio of the pulp to the impregnation alkali is 1: 20, mixing and stirring for 600s, wherein the temperature of the impregnation alkali liquor is 53 ℃, and the concentration of the impregnation alkali is 219 g/l;

(3) auxiliary dipping: the auxiliary impregnation is intermittent feeding and continuous discharging, and is continuously stirred in the auxiliary impregnation process, wherein the auxiliary temperature is 55 ℃, and the time is 28 min;

(4) squeezing and crushing: the composition of the pressed alkali cellulose is 34.6 percent of methyl cellulose and 16.0 percent of alkali;

(5) aging: delivering the squeezed and crushed alkali cellulose into an aging drum, wherein the aging outlet temperature is 42 ℃, and the aging time is 4.0 h;

(6) yellowing and dissolving: etiolated CS₂The addition amount (relative to alpha cellulose) of the cellulose sulfonate is 32 percent, the yellowing time is 38min, the dissolved alkali is a mixed solution of squeezed alkali liquor and new alkali, the preparation concentration is 8.2 percent, the temperature of the dissolved alkali is 5 ℃, the cellulose sulfonate after the yellowing dissolution is subjected to coarse grinding and fine grinding, and the coarse grinding gap is 2.5 mm; the fine grinding gaps are respectively 0.6 mm;

(7) filtering and ripening: the cellulose sulfonate firstly passes through a KK channel I, then is subjected to homoyellowing reaction in a ripening barrel, the ripening time is 9 hours, the ripening temperature is 20 ℃, and the ripened spinning solution is filtered by a KK filter channel II and then is sent to a spinning machine;

(8) spinning and drafting: the content of the alpha fiber in the spinning solution for spinning is 10.5 percent, the alkali content is 4.5 percent, the temperature is 20 ℃, the viscosity is 42S, and the ripening degree is 16 ml; adopting wet spinning with the spinning speed of 76 m/min; the spinning forming process needs three forming baths and three drafting, the forming bath components of the spinning comprise sulfuric acid, sodium sulfate and zinc sulfate, and the first forming process parameters are as follows: the temperature is 48 ℃, the concentration of sulfuric acid is 107g/l, and the concentration of zinc sulfate is 10.8 g/l; the second molding process parameter is as follows: the temperature is 72 ℃, and the sulfuric acid concentration is 54 g/l; the third molding process parameter is as follows: the temperature is 82 ℃, and the concentration of sulfuric acid is 43 g/l; the three-pass drafting is carried out in a first forming bath, the drafting rate is 50% through the speed difference between a spinning nozzle and a godet, the second drafting is carried out in a second forming bath, the speed adjustment between the godet and a drafting roller is realized, the drafting rate is 12%, the third drafting is carried out in a third forming bath, the third forming bath adopts a spraying mode, the speed adjustment among a plurality of drafting rollers is realized, and the drafting rate is 42%;

(9) refining and post-treatment: the method comprises the steps of cleaning a fluff forming tank, washing with water, desulfurizing, washing with water twice, bleaching, washing with water three times, pickling and oiling, wherein the water in the fluff forming tank needs to be filtered by fenda shells, and the after-treatment leacheate needs to be filtered by a bag filter. The temperature of the fluff forming groove is 93 ℃, the temperature of primary washing is 45 ℃, the desulfurization temperature is 76 ℃, the temperature of secondary washing is 62 ℃, the bleaching PH is 9.0, the temperature of tertiary washing is 63 ℃, the oil bath temperature is 58 ℃, the concentration of the oil bath for oiling is 11g/L, and the circulation volume of the oil bath is 42m³The PH value of the oil bath is 6.0, and the components and the contents of the oil agent in the oil bath are respectively 20% of the lubricant, 8% of the emulsifier, 12% of the antistatic agent, 1.5% of the PH control agent and 1.0% of the antioxidant;

(10) drying and packaging: the drying has four areas, and the temperature of each area is respectively: packing at 130 deg.C, 120 deg.C, 110 deg.C and 100 deg.C by using a full-automatic packing machine;

(11) the properties of the cellulose fibers for vortex spinning prepared by the above process are shown in table 1.

Examples 2 to 5

The processes of examples 2 to 5 were the same as those of example 1 except for the difference in the components of the forming bath and the draft, and the properties of the cellulose fiber for vortex spinning prepared by the method are shown in table 1, and the properties of the yarn prepared by using the respective examples are shown in table 2.

Example 2

The forming bath process comprises the following steps: first-pass forming: the temperature is 45 ℃, the sulfuric acid content is 105g/l, and the zinc sulfate content is 11 g/l; the second molding process parameter is as follows: the temperature is 65 ℃, and the sulfuric acid content is 50 g/l; the third molding process parameter is as follows: the temperature is 78 ℃, and the sulfuric acid content is 38 g/l; the draft ratios of the three drafts are respectively as follows: 48%, 15% and 45%.

Example 3:

the forming bath process comprises the following steps: first-pass forming: the temperature is 55 ℃, the sulfuric acid content is 106g/l, and the zinc sulfate content is 10.5 g/l; the second molding process parameter is as follows: the temperature is 68 ℃, and the sulfuric acid content is 57 g/l; the third molding process parameter is as follows: the temperature is 80 ℃, and the sulfuric acid content is 42 g/l; the draft ratios of the three drafts are respectively as follows: 50%, 12% and 37%.

Example 4:

the forming bath process comprises the following steps: first-pass forming: the temperature is 50 ℃, the sulfuric acid content is 108g/l, and the zinc sulfate content is 10 g/l; the second molding process parameter is as follows: the temperature is 75 ℃, and the sulfuric acid content is 56 g/l; the third molding process parameter is as follows: the temperature is 81 ℃, and the sulfuric acid content is 45 g/l; the draft ratios of the three drafts are respectively as follows: 52%, 13% and 40%.

Example 5:

the forming bath process comprises the following steps: first-pass forming: the temperature is 52 ℃, the sulfuric acid content is 107g/l, and the zinc sulfate content is 10.8 g/l; the second molding process parameter is as follows: the temperature is 72 ℃, and the sulfuric acid content is 54 g/l; the third molding process parameter is as follows: the temperature is 82 ℃, and the sulfuric acid content is 39 g/l; the draft ratios of the three drafts are respectively as follows: 45%, 14% and 42%.

TABLE 1 Properties of fibers prepared with different spinning Process parameters

TABLE 2 yarn Properties prepared with the fibers of examples 1-5

Examples 6 to 10

Examples 6 to 10 the properties of the cellulose fibers for vortex spinning prepared by using the same process parameters as in example 1 except for the different components of the finish composition are shown in Table 3, and the properties of the yarns prepared in the respective examples are shown in Table 4.

Example 6

The oil bath temperature is 55 ℃, the oil bath concentration for oiling is 8g/L, and the oil bath circulation volume is 45m³The oil bath pH is 6.5, the oil agent components and contents are respectively 20% of lubricant, 8% of emulsifier, 12% of antistatic agent, 1.5% of pH control agent and 1.0% of antioxidant, the lubricant components are hydroxyl modified mineral oil and polyoxyethylene alkyl ether, and the mass ratio of the hydroxyl modified mineral oil to the polyoxyethylene alkyl ether is 1: 0.3.

example 7

The oil bath temperature is 55 ℃, the oil bath concentration for oiling is 8g/L, and the oil bath circulation volume is 45m³The oil bath pH is 6.5, the oil agent components and contents are respectively 20% of lubricant, 8% of emulsifier, 12% of antistatic agent, 1.5% of pH control agent and 1.0% of antioxidant, the lubricant components are hydroxyl modified mineral oil and polyoxyethylene alkyl ether, and the mass ratio of the hydroxyl modified mineral oil to the polyoxyethylene alkyl ether is 1: 0.5.

example 8

The oil bath temperature is 65 ℃, the oil bath concentration for oiling is 9.5g/L, and the oil bath circulation volume is 55m³The oil bath pH is 6.0, the oil agent components and contents are respectively 20% of lubricant, 8% of emulsifier, 12% of antistatic agent, 1.5% of pH control agent and 1.0% of antioxidant, the lubricant components are hydroxyl modified mineral oil and polyoxyethylene alkyl ether, and the mass ratio of the hydroxyl modified mineral oil to the polyoxyethylene alkyl ether is 1: 0.3.

example 9

The oil bath temperature is 65 ℃, the oil bath concentration for oiling is 9.5g/L, and the oil bath circulation volume is 55m³The PH of the oil bath is 6.0, and the components and the contents of the oil agent are respectively 20 percent of lubricant, 8 percent of emulsifier, 12 percent of antistatic agent and P1.5 percent of H control agent and 1.0 percent of antioxidant, wherein the lubricant comprises hydroxyl modified mineral oil and polyoxyethylene alkyl ether, and the mass ratio of the hydroxyl modified mineral oil to the polyoxyethylene alkyl ether is 1: 0.5.

example 10

The oil bath temperature is 60 ℃, the oil bath concentration for oiling is 10g/L, and the oil bath circulation volume is 50m³The oil bath pH is 5.8, the oil agent components and contents are respectively 20% of lubricant, 8% of emulsifier, 12% of antistatic agent, 1.5% of pH control agent and 1.0% of antioxidant, the lubricant components are hydroxyl modified mineral oil and polyoxyethylene alkyl ether, and the mass ratio of the hydroxyl modified mineral oil to the polyoxyethylene alkyl ether is 1: 1.

TABLE 3 fiber Properties for different oil bath compositions

Properties of the fiber	Example 6	Example 7	Example 8	Example 9	Example 10
						Dry breaking Strength (cN/dtex)	2.75	2.78	2.73	2.80	2.74
Wet breaking Strength (cN/dtex)	1.42	1.44	1.49	1.46	1.48
						Defect (mg/100g)	0.1	0.1	0.2	0.1	0.1
Oil content%	0.34	0.30	0.35	0.38	0.32
						Coefficient of static friction	0.214	0.193	0.196	0.183	0.245
Coefficient of dynamic friction	0.125	0.132	0.093	0.115	0.217

TABLE 4 Properties of yarns prepared with the fibers of examples 6-10

As can be seen from the results in tables 1-4, in examples 1-10, the dry breaking strength of the fiber is much greater than the dry breaking strength of the cotton type in the national standard GB/T114463-2008, which is not less than 2.1cN/dtex, the wet breaking strength is also much greater than the national standard degree which is not less than 1.2cN/dtex, the friction coefficient of the obtained fiber is low, the broken ends of the vortex spinning are few, the neps of the spun yarn are low, the strength is high, the spinning speed is high, and the spinning cost is saved.

The present invention is not limited to the above-described embodiments, and the embodiments and the descriptions are described in order to understand the present invention more deeply, and the present invention may have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications fall into the protection scope of the present invention.