Biomass regenerated fiber blended yarn and preparation method thereof

Abstract

The present application relates to the field of blended yarns, and specifically discloses a biomass regenerated fiber blended yarn and a preparation method thereof. The biomass regenerated fiber blended yarn is spun from biomass regenerated fiber and cotton fiber, with a blending ratio of 20 / 80 to 80 / 20; the biomass regenerated fiber is spun from a biomass spinning solution; the biomass spinning solution is prepared from the following raw materials in parts by weight: 50 parts of a 50% NMMO aqueous solution; 5 to 15 parts of reed pulp; and 0.59 to 1.13 parts of a slurry additive. The preparation method is as follows: (1) mixing cotton fiber with biomass regenerated fiber, opening and cleaning cotton, and combing the cotton to obtain raw sliver; (2) the raw sliver is subjected to a cleaning and combing process and a combing process to obtain a combed sliver; (3) the combed sliver is subjected to a drawing process, a roving process, and a spinning process to obtain a biomass regenerated fiber blended yarn. The present application has the effect of improving the yarn quality of the blended yarn.

Description

Technical Field

[0001] The present application relates to the field of blended yarns, and in particular to a biomass regenerated fiber blended yarn and a preparation method thereof. Background Art

[0002] In the context of environmentally friendly and healthy fashion trends, consumers want to return to nature and advocate green. People have higher requirements for clothing and home textiles, and natural fiber and environmentally friendly fiber textiles are receiving more and more attention.

[0003] Biomass-derived fibers are made from natural plants and animals. They primarily include plant-derived and animal-derived fibers. Plant-derived fibers are further divided into regenerated cellulose fibers, cellulose ester fibers, and regenerated plant protein fibers; animal-derived fibers include regenerated animal protein fibers and chitin fibers. Biomass-derived fibers offer excellent properties such as renewable raw materials and biodegradability, embodying the concept of environmentally friendly fibers.

[0004] Reeds grow quickly, have strong reproductive capacity, and are sustainable, making them a renewable resource. However, their utilization rate is low, resulting in resource waste. Related research has shown that reeds contain approximately 30-50% cellulose, making them suitable for use as raw material for biomass regenerated fiber.

[0005] In related technologies, reed stems are used as raw materials to produce viscous pulp, which is then wet-spun into regenerated cellulose fibers, which are then blended with bamboo and flax fibers to produce blended yarns. However, the pulp made from reed stems has thicker cell walls, and the S2 layer of microfibers is nearly axially arranged, with an angle of about 30 to 40 degrees to the longitudinal axis of the fiber. Moreover, the arrangement of the microfibers does not terminate at the end of the fiber, but instead continues to extend to the back like a spiral around the end of the fiber. Its structural characteristics make it difficult to beat, that is, it is not easy to achieve external fine fiberization. The fiberization rate of the pulp is low, and the prepared reed fibers are rough, frizzy, and highly uneven, resulting in low strength and high hairiness in the final blended yarn. Summary of the Invention

[0006] In order to improve the yarn quality of blended yarn, the present application provides a biomass regenerated fiber blended yarn and a preparation method thereof.

[0007] In the first aspect, the present application provides a biomass regenerated fiber blended yarn using the following technical solution:

[0008] A biomass regenerated fiber blended yarn is spun from biomass regenerated fiber and cotton fiber at a blending ratio of 20 / 80 to 80 / 20; the biomass regenerated fiber is spun from a biomass spinning solution; the biomass spinning solution is prepared from the following raw materials in parts by weight: 50 parts of a 50% NMMO aqueous solution; 5 to 15 parts of reed pulp; and 0.59 to 1.13 parts of a slurry additive.

[0009] By adopting the above technical solution, the biomass regenerated fiber prepared from reed fiber fully utilizes the reed and improves resource utilization. The single fiber strength of the reed fiber is increased by the sizing agent, thereby improving the yarn quality of the biomass regenerated fiber.

[0010] Optionally, the preparation of the reed pulp includes the following steps: pretreating fresh reeds to obtain reed segments with a length of 40 mm ± 5 mm; immersing the reed segments in an immersion liquid for 3 to 5 days, stirring for 10 to 20 minutes every 1.5 to 2.5 hours during the soaking period to obtain a pretreated material; treating the pretreated material with alkali solution, washing it to neutrality, and vacuum drying it to obtain reed pulp.

[0011] By adopting the above technical solution, fresh reeds are used, making it easier to beat the reeds, improving the fineness of the pulp, and reducing the probability of the spinning solution used to prepare the pulp clogging the equipment, thereby improving the fiber yield of the pulp. Soaking the reed segments reduces the bonding strength of various substances in the reed segments, facilitating alkaline degumming, thereby increasing the cellulose content in the pulp, thereby improving the breaking strength of the reed fibers and the quality of the blended yarn.

[0012] Optionally, the impregnation liquid includes softened water, polyaluminum chloride and alkyl glycoside, and the weight ratio of the softened water, polyaluminum chloride and alkyl glycoside is 100:(5-15):(2-6).

[0013] By adopting the above technical solution, silicon forms an oxide film with a high silicon content on the surface of the reed pulp particles, resulting in enhanced hydrophilicity of the reed pulp, thereby reducing the hygroscopicity and softness of the cellulose material in the reed pulp, making the pulp difficult to beat and break, and the prepared reed fiber has poor softness; polyaluminum chloride and alkyl glycoside are combined to reduce the silicon content in the pulp, improve the softness of the reed fiber, and less likely to produce hairiness during the blending process of the reed fiber and cotton fiber; the toughness and breaking strength of the reed fiber are improved, reducing the probability of breakage or cracking of the reed fiber, further reducing the amount of harmful hairiness, and improving the breaking strength of the blended yarn.

[0014] Optionally, the alkyl glycoside is selected from dodecyl glucoside.

[0015] By adopting the above technical solution, the combination of lauryl glucoside and polyaluminium chloride improves the silicon removal and softening ability of the impregnation solution. Lauryl glucoside and polyaluminium chloride emulsify the wax in the reed, increase the cellulose content in the pulp, and improve the softness of the reed fiber.

[0016] Optionally, the slurry additive includes a reinforcing agent, starch and a dispersant, and the weight ratio of titanium pentoxide, starch and dispersant is (8-15): (100-275):5.

[0017] By adopting the above technical solution, the reinforcing agent, starch and dispersant are combined to improve the strength of the reed fiber, reduce the probability of the reed fiber being broken in the blending process, reduce the hairiness of the blended yarn, and improve the tensile strength of the blended yarn.

[0018] Optionally, the reinforcing agent is selected from titanium pentoxide.

[0019] By adopting the above technical solution, titanium pentoxide and starch cooperate with each other, thereby improving the fixation rate of titanium pentoxide in the reed fiber, thereby improving the breaking strength of the reed fiber.

[0020] In a second aspect, the present application provides a method for preparing a biomass regenerated fiber blended yarn using the following technical solution:

[0021] A method for preparing biomass regenerated fiber blended yarn comprises the following steps:

[0022] (1) mixing cotton fiber with the above-mentioned biomass regenerated fiber by a fiber blending process, and sequentially performing processes such as opening and cleaning, and carding to obtain carded sliver;

[0023] (2) subjecting the carded sliver to a cleaning and carding process and a combing process to obtain a combed sliver;

[0024] (3) The combed sliver is subjected to the drawing process, the roving process and the spinning process to produce the biomass regenerated fiber blended yarn.

[0025] By adopting the above technical solution, biomass regenerated fiber blended yarn is prepared through the ring spinning process, the process is simple and easy to promote.

[0026] Optionally, the pre-spinning process includes a drawing process, and the process parameters of the drawing process are set to a drawing number of 6; a total drafting multiple of 6.66 times; a rear zone drafting multiple of 1.3 times; a roller spacing of 40×45; a sliver delivery speed of 500m / min, and a cotton strip quantity of 14.5g / 5m.

[0027] By adopting the above technical solution, combining the characteristics of the vortex spinning process, and adjusting the quantitative of the cotton sliver, a yarn with a soft hand feel can be prepared.

[0028] Optionally, the fineness of the biomass regenerated fiber blended yarn is 9.8-20tex.

[0029] By adopting the above technical solution, the product is suitable for different occasions and its applicability is improved.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. Softened water, polyaluminium chloride and alkyl polyglycoside are used to prepare an impregnation solution, which is then used to soak pretreated fresh reeds. This promotes the separation of silicon-containing substances, wax and the like from cellulose, facilitates reed pulping, improves the fineness of the reed pulp, reduces the fiberization rate of the pulp, and produces soft and strong reed fibers, thereby increasing the breaking strength of the blended yarn, reducing harmful hairiness in the blended yarn, and improving the yarn quality of the blended yarn.

[0032] 2. The combination of lauryl glucoside and polyaluminium chloride improves the desiliconization and softening ability of the impregnation solution. Lauryl glucoside and polyaluminium chloride emulsify the wax in the reed, increase the cellulose content in the pulp, and improve the softness of the reed fiber.

[0033] 3. Titanium pentoxide and starch cooperate with each other to improve the fixation rate of titanium pentoxide in reed fiber, thereby improving the breaking strength of reed fiber. DETAILED DESCRIPTION

[0034] The present application is further described in detail below with reference to the following examples and comparative examples.

[0035] In the following examples, if no specific conditions are specified, the experiments were carried out according to conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following examples can be obtained from common commercial sources.

[0036] The cotton fibers are selected from fine-staple cotton with a fiber length of 27-29 mm, an average fineness of 1.67 dtex, an average breaking strength of 2.8 cN / dtex, an average breaking elongation of 8.9%, an initial modulus of 68 cN / dtex, a wet-to-dry strength ratio of 115, a static friction coefficient of 0.28, a dynamic friction coefficient of 0.20, and a moisture regain of 8.2%.

[0037] Fresh reeds refer to reeds that are green when harvested and the time from harvesting to experiment is no more than 4 hours.

[0038] NMMO is N-methylmorpholine-N-oxide.

[0039] Polyaluminium chloride, powder, particle size 300 mesh, active ingredient content 90%.

[0040] The dispersant is selected from PEO-PEF type dispersants.

[0041] Reed fiber preparation example

[0042] Preparation Example 1

[0043] S1. Pretreatment: Clean the fresh reeds to remove the dirt, then cut them into 40mm±5mm lengths to obtain reed segments.

[0044] S2, immersion treatment, using softened water, polyaluminum chloride and lauryl glucoside according to the weight ratio of 100:5:2 to prepare an immersion liquid, the immersion liquid temperature is maintained at 25 ° C, and the reed segment is immersed in the immersion liquid for 4 days, during which time it is stirred for 10 minutes every 2 hours to obtain a pretreated material;

[0045] S3, cooking, using sodium hydroxide to prepare 100g / L cooking liquid, putting the pretreated material into an autoclave, cooking at a constant temperature of 65°C for 90min, with a stirring blade speed of 60r / min, after two small steam releases, keeping warm for 2 hours and then releasing steam, pouring the material, repeatedly washing the material with 0.5g / L hydrochloric acid solution and clean water until the slurry is neutral, and vacuum drying to obtain reed pulp;

[0046] S4. Prepare a slurry additive by mixing 0.03 kg of titanium pentoxide, 0.55 kg of starch, and 0.01 kg of a dispersant to form a slurry additive;

[0047] S5, prepare spinning solution, mix 50kg of 50wt% NMMO aqueous solution and 0.01kg propyl gallate, evacuate at 60-100°C, maintain the vacuum degree at about 0.1MPa, and concentrate until the NMMO concentration reaches the required concentration of 87wt%, put it into a stainless steel stirring tank together with the slurry additive prepared in S4 and 5kg of reed pulp prepared in S4, stir under vacuum conditions at 90-110°C, and stir at a speed of 1000r / min for 20min until the reed pulp is completely dissolved, and let it stand at 50°C for 30min to obtain biomass spinning solution;

[0048] S5. The spinning solution is spun into reed fibers with a fiber fineness of 2.77 tex using a conventional wet spinning process.

[0049] Preparation Example 2

[0050] S1. Pretreatment: Clean the fresh reeds to remove the dirt, then cut them into 40mm±5mm lengths to obtain reed segments.

[0051] S2, immersion treatment, using softened water, polyaluminum chloride and lauryl glucoside according to the weight ratio of 100:10:4 to prepare an immersion liquid, the immersion liquid temperature is maintained at 25 ° C, and the reed segment is immersed in the immersion liquid for 4 days, during which time it is stirred for 10 minutes every 2 hours to obtain a pretreated material;

[0052] S3, cooking, using sodium hydroxide to prepare 100g / L cooking liquid, putting the pretreated material into an autoclave, cooking at a constant temperature of 65°C for 90min, with a stirring blade speed of 60r / min, after two small steam releases, keeping warm for 2 hours and then releasing steam, pouring the material, repeatedly washing the material with 0.5g / L hydrochloric acid solution and clean water until the slurry is neutral, and vacuum drying to obtain reed pulp;

[0053] S4. Prepare a slurry additive by mixing 0.05 kg of titanium pentoxide, 0.75 kg of starch, and 0.03 kg of a dispersant to form a slurry additive;

[0054] S5, prepare spinning solution, mix 50kg of 50wt% NMMO aqueous solution with 0.01kg propyl gallate, evacuate at 60-100°C, maintain the vacuum degree at about 0.1MPa, and concentrate until the NMMO concentration reaches the required concentration of 87wt%, put it into a stainless steel stirring tank together with the slurry additive prepared in S4 and 10kg of reed pulp prepared in S4, stir under vacuum conditions at 90-110°C, and stir at a speed of 1000r / min for 20min until the reed pulp is completely dissolved, and let it stand at 50°C for 30min to obtain biomass spinning solution;

[0055] S5. The spinning solution is spun into reed fibers with a fiber fineness of 2.77 tex using a conventional wet spinning process.

[0056] Preparation Example 3

[0057] S1. Pretreatment: Clean the fresh reeds to remove the dirt, then cut them into 40mm±5mm lengths to obtain reed segments.

[0058] S2, immersion treatment, using softened water, polyaluminium chloride and lauryl glucoside according to the weight ratio of 100:15:6 to prepare an immersion liquid, the immersion liquid temperature is maintained at 25 ° C, and the reed segment is immersed in the immersion liquid for 4 days, during which time it is stirred for 10 minutes every 2 hours to obtain a pretreated material;

[0059] S3, cooking, using sodium hydroxide to prepare 100g / L cooking liquid, putting the pretreated material into an autoclave, cooking at a constant temperature of 65°C for 90min, with a stirring blade speed of 60r / min, after two small steam releases, keeping warm for 2 hours and then releasing steam, pouring the material, repeatedly washing the material with 0.5g / L hydrochloric acid solution and clean water until the slurry is neutral, and vacuum drying to obtain reed pulp;

[0060] S4. Prepare a slurry additive by mixing 0.08 kg of titanium pentoxide, 1 kg of starch, and 0.05 kg of a dispersant to form a slurry additive;

[0061] S5, prepare spinning solution, mix 50kg of 50wt% NMMO aqueous solution with 0.01kg propyl gallate, evacuate at 60-100°C, maintain the vacuum degree at about 0.1MPa, and concentrate until the NMMO concentration reaches the required concentration of 87wt%, put it into a stainless steel stirring tank together with the slurry additive prepared in S4 and 15kg of reed pulp prepared in S4, stir under vacuum conditions at 90-110°C, and stir at a speed of 1000r / min for 20min until the reed pulp is completely dissolved, and let it stand at 50°C for 30min to obtain biomass spinning solution;

[0062] S5. The spinning solution is spun into reed fibers with a fiber fineness of 2.77 tex using a conventional wet spinning process.

[0063] Preparation Example 4

[0064] The difference from Preparation Example 2 is that the added amount of reed pulp is 5 kg.

[0065] Preparation Example 5

[0066] The difference from Preparation Example 2 is that the added amount of reed pulp is 15 kg.

[0067] Preparation Example 6

[0068] The difference from Preparation Example 2 is that the added amount of titanium pentoxide is 0.03 kg.

[0069] Preparation Example 7

[0070] The difference from Preparation Example 2 is that the added amount of titanium pentoxide is 0.08 kg.

[0071] Preparation Example 8

[0072] The difference from Preparation Example 2 is that no slurry additive is added.

[0073] Preparation Example 9

[0074] The difference from Preparation Example 2 is that no titanium pentoxide is added to the slurry additive.

[0075] Table 1 Regenerated spinning solution raw materials in Preparation Examples 2 to 9 (kg)

[0076]

[0077] Preparation Example 10

[0078] The difference from Preparation Example 2 is that no polyaluminum chloride and dodecyl glucoside are added to the impregnation solution.

[0079] Preparation Example 11

[0080] The difference from Preparation Example 2 is that no polyaluminum chloride is added to the impregnation solution.

[0081] Preparation Example 12

[0082] The difference from Preparation Example 2 is that no dodecyl glucoside is added to the impregnation solution.

[0083] Table 2 Raw materials for the impregnation solutions of Preparation Examples 2 and 10-12 (kg)

[0084] Softened water Polyaluminum chloride Dodecyl glucoside Preparation Example 2 10 1 0.4 Preparation Example 10 10 / / Preparation Example 11 10 / 0.4 Preparation Example 12 10 1 /

[0085] Preparation example performance test

[0086] 1. The average degree of polymerization of biomass spinning solution was determined by referring to the method in "FZ / T50010.3~2011 Determination of viscosity of viscose pulp". The test temperature was 20℃. The test results are shown in Table 3.

[0087] 2. The cellulose alpha content (%) of the biomass spinning solution was determined by referring to the method in "FZ / T50010.4~1998 Determination of cellulose alpha in viscose pulp". The test results are shown in Table 3.

[0088] 3. The breaking strength (cN / dtex) and breaking elongation (%) of reed fiber were tested using an electronic single fiber strength meter that meets the requirements of "FZ / T98009-2011 Electronic Single Fiber Strength Meter". The test results are detailed in Table 3.

[0089] 4. Degradation rate (%) experiment, the steps are as follows:

[0090] (1) Weigh the reed fiber sample and record it as W0;

[0091] (2) Take ordinary garden soil, remove the compacted soil, plant debris and other debris, and move the soil into a 120cm×20cm×50cm container. The lid of the container has holes reserved, and the reed fiber samples are neatly arranged at a certain interval and buried about 10cm below the soil. The soil is kept moist with deionized water and placed in an environment of 20℃±2℃ and 65%±2% for 28 days.

[0092] (3) Take out the reed fiber sample, wash it with deionized water, and then dry it in a vacuum oven at 50°C for 24 hours. Then balance it in an environment with an humidity of 20°C ± 2°C and 65% ± 2% for 24 hours. Weigh it and record it as W1. Calculate the degradation rate (%) of the reed fiber sample using the following formula:

[0093] Degradation rate (%) = (W0-W1) / W0×100%, see Table 3 for test results

[0094] Table 3 Test results of each preparation example

[0095] Average degree of polymerization Breaking strength / (cN / dtex) Elongation at break / % Degradation rate / % Preparation Example 1 635 3.67 17.65 34.12 Preparation Example 2 624 3.78 17.59 34.25 Preparation Example 3 622 3.72 17.51 34.17 Preparation Example 4 607 3.42 16.58 30.15 Preparation Example 5 634 3.68 17.42 34.89 Preparation Example 6 617 3.34 17.53 33.90 Preparation Example 7 619 3.72 17.25 33.57 Preparation Example 8 610 2.94 14.25 24.67 Preparation Example 9 618 3.17 16.04 30.23 Preparation Example 10 725 2.59 17.52 9.52 Preparation Example 11 713 2.94 17.64 14.67 Preparation Example 12 684 3.22 16.87 13.33

[0096] In combination with Preparation Example 1, Preparation Example 2 and Preparation Example 3 and Table 3, by adjusting the types of impregnation liquid and slurry additives, as well as the weight ratio of 50% NMMO aqueous solution, reed pulp and slurry additives, low-viscosity recycled spinning solution and high-strength, high-degradation rate reed fiber were prepared.

[0097] The amount of reed pulp added in Preparation Example 2 is 10 kg, the amount of reed pulp added in Preparation Example 4 is 5 kg, and the amount of reed pulp added in Preparation Example 5 is 15 kg. It can be seen from Table 3 that with the increase in the amount of reed pulp added, the average degree of polymerization of the regenerated spinning solution increases, the breaking strength of the reed fiber first increases and then decreases, the breaking elongation first increases and then decreases, and the degradation rate increases.

[0098] In Preparation Example 2, the addition amount of titanium pentoxide was 0.05, and the weight ratio of titanium pentoxide to starch was 1:15; in Preparation Example 6, the addition amount of titanium pentoxide was 0.03, and the weight ratio of titanium pentoxide to starch was 1:25; in Preparation Example 7, the addition amount of titanium pentoxide was 0.08, and the weight ratio of titanium pentoxide to starch was 8:75, which is approximately 1:9.375. As shown in Table 3, with increasing addition amount of titanium pentoxide, the average degree of polymerization of the regenerated spinning solution first increases and then decreases, the breaking strength of the reed fiber first increases and then decreases, the elongation at break first increases and then decreases, and the degradation rate first increases and then decreases. The decrease in breaking strength is due to the decrease in the ratio of titanium pentoxide to starch and the decrease in the fixation rate of titanium pentoxide in the reed fiber. The increase in degradation rate is due to the fact that during the preparation process, a very small amount of titanium pentoxide, under the action of propyl gallate and temperature, forms titanate, which increases the degradation rate of cellulose.

[0099] Compared with Preparation Example 2, Preparation Example 8 did not add slurry additives, that is, titanium pentoxide, starch and dispersant were not added. Combined with Table 3, it can be seen that the average degree of polymerization of the regenerated spinning solution prepared in Preparation Example 8 is lower than that in Preparation Example 2, and the breaking strength and breaking elongation of the reed fiber prepared in Preparation Example 8 are lower than those in Preparation Example 2. The degradation rate of the reed fiber prepared in Preparation Example 8 is low. The main reason is that starch and titanium pentoxide are combined to form a reinforced network structure, which improves the mechanical properties of the fiber. At the same time, in the reed fiber degradation experiment, starch serves as a carbon source, which increases the activity of microorganisms and facilitates the degradation of reed fibers by microorganisms.

[0100] As can be seen from Table 3, compared to Preparation Example 8, Preparation Example 9, which also added titanium pentoxide, increased the breaking strength of the reed fiber by approximately 12.56%. Furthermore, compared to Preparation Example 2, which added a combination of titanium pentoxide, starch, and a dispersant, the breaking strength of the reed fiber increased by approximately 23.43%. This shows that while adding only a reinforcement such as titanium pentoxide increases the breaking strength of the reed fiber, the rate of increase in the breaking strength of the reed fiber is relatively small because titanium pentoxide is not easily fixed. When titanium pentoxide, starch, and a dispersant are used in combination, the rate of increase in the breaking strength of the reed fiber increases. This shows that starch not only provides a carbon source and promotes the degradation of reed fiber, but also plays a role in increasing the strength of the reed fiber.

[0101] Compared with Preparation Example 2, no polyaluminum chloride and dodecyl glucoside were added to the impregnation solution used in Preparation Example 10, that is, the pretreated reeds were soaked in softened water for 4 days. Combined with Table 3, it can be seen that the use of polyaluminum chloride and dodecyl glucoside effectively reduced the average polymerization degree of the regenerated spinning solution, facilitated the spinning and forming of the regenerated spinning solution, and effectively increased the breaking strength and degradation rate of the reed fiber.

[0102] Compared with Preparation Example 10, Preparation Example 11 adds dodecyl glucoside, and Preparation Example 12 adds polyaluminum chloride. Combined with Preparation Example 2 and Table 3, it can be seen that polyaluminum chloride or dodecyl glucoside used alone can also reduce the average polymerization degree of the regenerated spinning solution and increase the breaking strength and degradation rate of the reed fiber, but it is far less effective than the combined use of polyaluminum chloride and dodecyl glucoside.

[0103] Example

[0104] Example 1

[0105] (1) Preparation before combing:

[0106] (a) The reed fiber and cotton fiber prepared in Preparation Example 2 were arranged into bales according to a blending ratio of 20 / 80, and the cotton was picked using a BO-P reciprocating plucker. The process parameters were set as follows: a plucker beater speed of 1080 r / min; an intermittent drop of the plucker arm of 1.5 mm / time; a reciprocating trolley linear speed of 16 m / min; a distance between the plucker beater tip and the rib of ∼3 mm; and a static pressure at the cotton outlet of ∼970 Pa.

[0107] (b) A conventional TF30 heavy material separator was used to remove iron impurities from the raw materials. The process parameters were set as follows: fan impeller speed 2290 r / min; cotton stripping beater speed 113 r / min; distance between cotton stripping beater and dust cage surface 1 mm; inlet pressure ~1200 Pa; dust discharge pressure ~20 Pa;

[0108] (c) Using conventional process parameters, the FA103 double-axial flow cotton opener was used to open the cotton; the MX-1 multi-bin cotton blender and the CL-C1 cotton opener were used to further open the raw materials;

[0109] (d) TC~15 carding machine fully removes impurities, combs, draws and forms slivers on the raw materials;

[0110] (e) CL40 pre-drawing machine, drafting roller gauge 39 mm, number of draw rollers 24, draft ratio 1.424, lap basis weight 67.4 g / m;

[0111] (2) The combing machine and the combing machine finely comb the cotton rolls to remove fine impurities, cotton knots and short fibers; the process parameters of the combing machine are: cotton drop gauge 12mm, roller gauge S3.5mmA43mm, clamping time 240, drafting teeth 52 / 50, cotton feed roller ratchet 18, lead-out tension teeth 42 / 80, cotton feed tension teeth 53, drafting roller teeth 29, and combed strips are obtained.

[0112] (3) The combed sliver is subjected to a drawing process, a roving process, and a spinning process to produce a biomass regenerated fiber blended yarn, wherein: (a) the drawing process uses a drawing frame for drawing and drafting to improve the uniformity and straightness of the combed sliver, and the number of draws in this process is 6; the total drafting multiple is 6.66 times; the back zone drafting multiple is 1.3 times; the roller gauge is 40×45; the sliver delivery speed is 500 m / min, the sliver basis weight is 14.5 g / 5 m, and a drawn sliver is obtained;

[0113] (b) Roving process: The sliver was fed into a roving frame. The roving frame process parameters were set to a total draft of 10, a back zone draft of 1.24, a twist coefficient of 72, a flyer speed of 1150 r / min, a roller gauge of 10.5 mm × 28 mm × 45 mm, a roving basis weight of 4 g / 10 m, and a weight deviation of ±0.08 g / 10 m to produce roving.

[0114] (c) Spinning process: The roving was fed into a spinning frame with the following process parameters: total draft ratio of 27.59, mechanical draft efficiency of 98%, twist coefficient of 329, and twist direction of Z twist, to obtain a biomass regenerated fiber blended yarn with a fineness of 14.8 tex.

[0115] Example 2

[0116] The difference from Example 1 is that the reed fiber and the cotton fiber are packaged according to a blending ratio of 50 / 50.

[0117] Example 3

[0118] The difference from Example 1 is that the reed fiber and the cotton fiber are packaged according to a blending ratio of 80 / 20.

[0119] Example 4

[0120] The difference from Example 1 is that the total drafting ratio of the spun yarn is 40, the mechanical drafting efficiency is 98%, the twist coefficient is 329, and the biomass regenerated fiber blended yarn with a fineness of 9.8 tex is obtained.

[0121] Example 5

[0122] The difference from Example 1 is that the total drafting ratio of the spun yarn is 19.6, the mechanical drafting efficiency is 98%, the twist coefficient is 329, and the biomass regenerated fiber blended yarn with a fineness of 20 tex is obtained.

[0123] Comparative Example

[0124] Comparative Example 1

[0125] The reed fiber prepared in Preparation Example 8 was used, that is, no slurry additive was added during the preparation of the reed fiber.

[0126] Comparative Example 2

[0127] The reed fiber prepared in Preparation Example 10, that is, the impregnation liquid used in the preparation of the reed fiber was softened water, and no polyaluminum chloride and dodecyl glucoside were added.

[0128] Comparative Example 3

[0129] The difference from Example 1 is that: (3) the sliver weight in the drawing process is 13 g / 5 m to obtain a drawn sliver; the total drafting multiple in the roving process is adjusted to a roving weight of 4 g / 10 m.

[0130] Comparative Example 4

[0131] The difference from Example 1 is that: (3) the sliver weight in the drawing process is 20 g / 5 m to obtain drawn sliver; the total drafting multiple in the roving process is adjusted to a roving weight of 4 g / 10 m.

[0132] Example performance test

[0133] 1. Place the yarn sample in a constant temperature and humidity chamber at (20±2)°C and (65±2)% for 24 hours to achieve equilibrium. Test the yarn hairiness using a yarn hairiness tester. See Table 4 for the test results.

[0134] 2. Place the yarn sample in a constant temperature and humidity chamber at (20±2)°C and (65±2)% for 24 hours to achieve equilibrium. Using a yarn evenness analyzer, test the CV value (%) of biomass regenerated fiber blended yarns at a speed of 100 m / min, using a yarn evenness analyzer, according to GB / T 3292.1-2008, "Test method for unevenness of yarn length in textiles - Part 1: Capacitance method." Each sample was tested 10 times, and the average results were taken. See Table 4 for detailed results.

[0135] 3. Place the yarn sample in a constant temperature and humidity chamber at (20±2)°C and (65±2)% for 24 hours to achieve equilibrium. Referencing GB / T3916—2013 Textiles—Yarn from Packages—Determination of Breaking Strength and Elongation of Single Yarn (CRE Method)—an electronic single yarn strength tester was used to test the tensile strength (cN / tex) of biomass regenerated fiber blended yarns. The test speed was (500±10) mm / min, the clamping distance was (500±2) mm, and the preload tension was (0.5±0.1) cN / tex. Each sample was tested 30 times, and the average results were calculated. The test results are detailed in Table 4.

[0136] Table 4 Test results of various embodiments and comparative examples

[0137]

[0138] In combination with Example 1, Example 2 and Example 3, by adjusting the process parameters, a biomass regenerated fiber blended yarn with high strength, high yarn uniformity and low hairiness was prepared.

[0139] Combining Example 1, Example 4, and Example 5, the difference between the three is that the yarn fineness prepared in Example 1 is 14.8 tex, the yarn fineness prepared in Example 4 is 9.8 tex, and the yarn fineness prepared in Example 5 is 20 tex. The roving quantity of the three is the same. That is, by adjusting the spun yarn drafting multiple, the fineness of the biomass regenerated fiber blended yarn is adjusted. Combining Table 4, it can be seen that as the yarn fineness decreases, the total amount of hairiness less than or equal to 3 mm of the yarn decreases, the total amount of hairiness greater than 3 mm first decreases and then increases, and the proportion of hairiness greater than 3 mm first decreases and then increases. The yarn CV value first decreases and then increases, and the breaking strength decreases. This is because as the yarn fineness decreases, the number of fibers per unit interface decreases, and the hairiness leaking out of the yarn body decreases. However, the spun yarn drafting roller speed is fast, and the drafting multiple is increased, some fibers are broken, and the hairiness greater than 3 mm increases. Hairiness larger than 3mm is generally considered harmful hairiness. Hairiness of 3mm or less gives a soft touch, while hairiness larger than 3mm gives an itchy feeling. That is, as the yarn fineness decreases, the yarn feels stiff and the itchy feeling becomes more severe. As the yarn becomes thinner, the breaking strength decreases.

[0140] Compared with Example 1, the reed fiber used in Comparative Example 1 was prepared without adding a sizing agent. As shown in Table 4, the breaking strength of the biomass regenerated fiber blended yarn spun from the reed fiber with the addition of a sizing agent was significantly improved.

[0141] Compared with Example 1, the reed fiber used in Comparative Example 2 was prepared by adding polyaluminum chloride and dodecyl glucoside to the impregnation solution. Combined with Table 4, it can be seen that the amount of hairiness greater than 3 mm in the biomass regenerated fiber blended yarn spun from the reed fiber added with polyaluminum chloride and dodecyl glucoside is significantly reduced.

[0142] The differences between Example 1, Comparative Example 3, and Comparative Example 4 are as follows: Example 1 uses a sliver weight of 14.5 g / 5 m, and the draft ratio is adjusted through the roving process to achieve a biomass regenerated fiber blended yarn fineness of 14.8 tex; Comparative Example 3 uses a sliver weight of 13 g / 5 m, and the draft ratio is adjusted through the roving process to achieve a biomass regenerated fiber blended yarn fineness of 14.8 tex; Comparative Example 4 uses a sliver weight of 20 g / 5 m, and the draft ratio is adjusted through the roving process to achieve a biomass regenerated fiber blended yarn fineness of 14.8 tex. As can be seen from Table 4, with increasing sliver weight, the breaking strength of the biomass regenerated fiber blended yarn first increases and then decreases. The main reasons for the decrease are: an increase in the roving draft ratio, an increase in the drafting burden, an increase in yarn unevenness, and the appearance of weak and strong segments in the yarn, indicating a decrease in the breaking strength of the blended yarn.

[0143] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A biomass regenerated fiber blended yarn, characterized in that: It is spun from biomass recycled fiber and cotton fiber, with a blending ratio of 20 / 80 to 80 / 20; The biomass regenerated fiber is spun from a biomass spinning solution; The biomass spinning solution is prepared from the following raw materials in parts by weight: 50 parts of 50% NMMO aqueous solution; 5-15 parts of reed pulp; 0.59-1.13 parts of pulping agent; The preparation of the reed pulp comprises the following steps: pre-treating fresh reeds to obtain reed segments with a length of 40 mm ± 5 mm; soaking the reed segments in an impregnation liquid for 3 to 5 days, stirring for 10 to 20 minutes every 1.5 to 2.5 hours, to obtain a pre-treated material; treating the pre-treated material with an alkali solution, washing it to a neutral state, and vacuum drying it to obtain the reed pulp; The impregnation solution comprises softened water, polyaluminium chloride and alkyl glycoside, wherein the weight ratio of the softened water, polyaluminium chloride and alkyl glycoside is 100:(5-15):(2-6); The slurry auxiliary agent includes a reinforcing agent, starch and a dispersant, wherein the reinforcing agent is selected from titanium pentoxide, and the weight ratio of titanium pentoxide, starch and dispersant is (8-15): (100-275):

5.

2. The biomass regenerated fiber blended yarn according to claim 1, characterized in that: The alkyl glycoside is selected from lauryl glucoside.

3. A method for preparing biomass regenerated fiber blended yarn, characterized in that: The following steps are involved: (1) Cotton fibers are mixed with the biomass regenerated fibers according to any one of claims 1 to 2 by a fiber blending process, and then subjected to the following steps: cotton opening, cleaning, carding, etc. to obtain carded sliver; (2) The raw sliver is subjected to a cleaning and combing process and a combing process to obtain a combed sliver; (3) The combed sliver is subjected to the drawing process, the roving process and the spinning process to produce the biomass regenerated fiber blended yarn.

4. The method for preparing biomass regenerated fiber blended yarn according to claim 3, characterized in that: The process parameters of the drawing process are set as 6 strands of drawing; total drafting ratio 6.66 times; back zone drafting ratio 1.3 times; roller spacing 40×45; sliver delivery speed 500m / min, and sliver weight 14.5g / 5m.

5. The method for preparing biomass regenerated fiber blended yarn according to claim 3, characterized in that: The fineness of the biomass regenerated fiber blended yarn is 9.8 to 20 tex.

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