A kind of seaweed fiber and lyocell fiber blended yarn and preparation method thereof

Abstract

The present invention relates to the technical field of textile chemical industry, and in particular to a blended yarn of seaweed fiber and lyocell fiber and a preparation method thereof, wherein the preparation method comprises blending, dyeing and fixing, and the blended yarn obtained is modified between blending and dyeing, and the treatment liquid used for the modification comprises a cationic etherifying agent, sodium hydroxide and calcium chloride, and the cationic etherifying agent comprises 3-chloro-2-hydroxypropyltrimethylammonium chloride. The present invention introduces calcium chloride when the blended yarn obtained by blending seaweed fiber and lyocell fiber is modified, and the blended yarn can be protected in alkali solution, so that it can be smoothly dyed and fixed, and the fiber damage of the blended yarn of seaweed fiber and lyocell fiber is reduced by designing a reasonable carding, drawing, roving and spinning process, and the yarn quality is improved, which greatly promotes the application of seaweed fiber in blended fabrics.

Description

Technical Field

[0001] The present application relates to the field of textile chemical technology, and in particular to a blended yarn of seaweed fiber and lyocell fiber and a preparation method thereof. Background Art

[0002] Seaweed fiber is a new type of green biodegradable fiber made from sodium alginate extracted from natural seaweed through a wet spinning process. It has good biocompatibility, flame retardancy and high absorbency, and is an environmentally friendly material. At the same time, seaweed fiber can produce negative ions, promote human metabolism, and is beneficial to human physical and mental health. Seaweed fiber also contains a variety of minerals and has certain antibacterial and deodorizing effects. It is widely used in many fields. For example: due to its excellent moisture absorption, film-forming and fiber-forming properties, seaweed fiber has shown great potential in the field of medical dressings, high-end clothing, underwear fabrics and decorative textiles.

[0003] However, the saturation power of seaweed fiber is low, and it is difficult to produce yarn spun purely from seaweed fiber. Therefore, in order to develop seaweed fiber in the textile field, seaweed fiber needs to be blended with other fibers, including animal fibers, to produce cashmere, silk, etc., which can not only match the feel and comfort of high-end animal fibers, but also make the blended fibers have antibacterial effects. During wearing and use, seaweed fiber has far-infrared radiation to keep warm and promote metabolism in the body, making it have good industrial application prospects in the field of clothing and industrial textiles.

[0004] Lyocell fiber is a cellulose fiber that uses solvent spinning technology. Its dry strength is slightly lower than that of polyester, but significantly higher than that of ordinary viscose fiber. Its wet strength is also significantly improved compared to viscose. It has very high rigidity and good dimensional stability after washing (the shrinkage rate is only 2%). At the same time, Lyocell fiber has high hygroscopicity, and its cross-section is round or oval, with beautiful luster, soft touch, good drape and good flow. In addition, Lyocell fiber can be completely decomposed in the soil and is pollution-free to the environment. Blending Lyocell fiber with other natural fibers or chemical fibers can make the blended fiber have better performance.

[0005] As one of the cellulose fibers, lyocell fiber should have the same dyeing properties as cotton fiber and viscose fiber. However, in comparison, dyes suitable for viscose fiber are relatively more suitable for lyocell fiber, such as direct dyes, reactive dyes, vat dyes, sulfur dyes and naphthol dyes, etc., and reactive dyes are more effective in terms of hue, vividness, color fastness and ease of dyeing operation. In the dyeing process, inorganic or organic sodium salts are dyeing auxiliaries that must be added to achieve functions such as dyeing promotion. Studies have shown that the structural characteristics of seaweed fiber lead to its low wet strength and poor salt and alkali tolerance. When it encounters materials containing Na +, K + and H + Ion exchange between the fiber and the solution is very easy to occur in such solutions, and the fiber will swell or even dissolve. Therefore, when using traditional dyeing and finishing processes to process blended fabrics including seaweed fibers, the seaweed fibers will gel, destroying the shape and strength of the entire fiber, causing greater damage to the seaweed fibers and causing weight loss.

[0006] Dyeing seaweed fiber is a key issue in its industrial application. For example, in the various seaweed fiber dyeing schemes disclosed in patents CN101736440A, CN103981744A and CN105332291A, the salt-free dyeing strategy is basically used to dye the seaweed fiber, but all of them are for dyeing the seaweed fiber alone, and do not involve blending of seaweed fiber with other fibers. The blended fabrics of seaweed fiber and other fibers are mostly based on maintaining the original color of the seaweed fiber, or white or the color of the original solution.

[0007] Therefore, it is urgent to find a dyeing method that can dye at least two fibers at the same time without affecting the structure and strength of the fibers, especially without damaging the morphology and strength of the seaweed fibers. Summary of the invention

[0008] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a blended yarn of seaweed fiber and lyocell fiber and a preparation method thereof, by modifying the blended yarn made by blending seaweed fiber and lyocell fiber so as to smoothly perform dyeing and color fixing treatment on the blended yarn, thereby avoiding damage to the seaweed fiber during the dyeing process, and thereby making the seaweed fiber and lyocell fiber blended yarn have multiple excellent properties while maintaining good mechanical properties.

[0009] In order to achieve the above-mentioned purpose and other related purposes, the technical solution adopted by the present invention is as follows:

[0010] In a first aspect, the present invention provides a method for preparing a blended yarn of seaweed fiber and lyocell fiber, characterized in that: the preparation method includes blending, dyeing and fixing, and between the blending and dyeing, the blended yarn obtained is subjected to a modification treatment, and the treatment liquid used in the modification treatment includes a cationic etherifying agent, sodium hydroxide and calcium chloride, and the cationic etherifying agent includes 3-chloro-2-hydroxypropyltrimethylammonium chloride.

[0011] In the present invention, the principle of modifying the blended yarn of seaweed fiber and lyocell fiber is as follows: the cationic etherifying agent 3-chloro-2-hydroxypropyltrimethylammonium chloride used is a quaternary ammonium salt, and the quaternary ammonium group is grafted onto the seaweed fiber and lyocell fiber in the blended yarn through an etherification reaction, so that both fibers are positively charged, and can form ionic bonds with anions in the dye or anionic groups containing carboxyl groups, thereby improving the adhesion of the dye, so that the blended yarn can be dyed without salt, thereby avoiding damage to the seaweed fiber by substances such as salt and alkali, and improving the dye absorption rate and fixation rate of the yarn. At the same time, sodium hydroxide needs to be added during the etherification process to smoothly carry out the etherification reaction, and sodium hydroxide, a strong base, can gel the seaweed fiber. In this regard, calcium chloride is added to the treatment solution of the modification treatment, and the activity of calcium ions is stronger than that of sodium ions, so that sodium ions cannot replace calcium ions in the seaweed fiber, which can avoid the influence of sodium hydroxide on the seaweed fiber, thereby protecting the seaweed fiber.

[0012] Optionally, in the treatment liquid, the mass fraction of the 3-chloro-2-hydroxypropyltrimethylammonium chloride is 2wt% to 4wt%.

[0013] Optionally, in the treatment solution, the concentration of sodium hydroxide is 10 to 15 g / L.

[0014] Optionally, in the treatment solution, the concentration of calcium chloride is 0.1 to 1.5 g / L.

[0015] In the present invention, by adding an appropriate amount of calcium chloride, it is possible to avoid the precipitation of calcium hydroxide in the treatment solution due to excessively high calcium ion concentration.

[0016] In some embodiments of the present invention, the preparation method specifically comprises the following steps:

[0017] S1, blending: using algae fiber and lyocell fiber as spinning raw materials, sequentially performing blowing, carding, drawing, roving and spinning processes to obtain blended yarn;

[0018] S2, modification treatment: preparing a modification treatment solution using a treatment liquid, placing the obtained blended yarn into the modification treatment solution, performing an oscillation treatment, and washing to obtain a modified blended yarn;

[0019] S3, dyeing: weighing dye and distilled water respectively to prepare dye solution, putting the modified blended yarn into the dye solution at room temperature, then heating the dye solution, and then keeping the temperature to perform dyeing treatment;

[0020] S4, color fixing: preparing a cationic color fixing agent aqueous solution, putting the dyed modified blended yarn into the cationic color fixing agent aqueous solution at room temperature for color fixing treatment, and obtaining the seaweed fiber and lyocell fiber blended yarn after washing and drying.

[0021] Optionally, in step S1, the blending ratio of the seaweed fiber to the lyocell fiber is 15-25:75-85.

[0022] Optionally, in step S1, the cleaning and combing process includes: opening, blending and combing the spinning raw materials in sequence at a temperature of 20-25°C and a humidity of 55%-65%, the opening roller speed during the opening is 270-290r / min, the cotton feeding cord speed is 2.3-2.5m / min, the stripping roller speed is 180-200r / min, and the opening ratio is 360-380 times; the oblique nail cord speed during the blending is 22-25m / min, the stripping roller speed is 88-100r / min, and the small opening roller speed is 20-350r / min. The speed is 370-400r / min, the distance between the corner nail curtain and the cotton roller is 58-62mm, and the distance between the corner nail curtain and the cotton pressing curtain is 68-72mm; the flat plate speed during combing is 190-210mm / min, the cylinder speed is 450-500r / min, the cylinder licker-in roller speed ratio is 1.9-2.1:1, the cylinder and flat plate distance is 0.20-0.25mm, the cylinder and licker-in roller distance is 0.17-0.19mm, the cylinder and doffer distance is 0.14-0.16mm, and the total draft multiple is 55-65 times.

[0023] Optionally, in step S1, the drawing process includes: performing the first-pass merging and the second-pass merging at a temperature of 20-25°C and a humidity of 55%-65%, wherein the slivers in the first-pass merging are 6-8, with a basis weight of 15-17 g / 5m, a roller gauge of (8-10) mm×(18-20) mm, a total drafting multiple of (4-5)×(1.5-1.6) times, and a rear zone drafting multiple of 1.55-1.65 times; the slivers in the second-pass merging are 4-6, with a basis weight of 15-17 g / 5m, a roller gauge of (8-10) mm×(18-20) mm, a total drafting multiple of (4-5)×(1.2-1.4) times, and a rear zone drafting multiple of 1.2-1.3 times.

[0024] Optionally, in step S1, the roving process includes: roving at a temperature of 20-25°C and a humidity of 55%-65%, the quantitative roving being 4.5-5.0g / 10m, the front roller speed being 174-182r / min, the roller gauge being (8-10)mm×(28-31)mm×(38-42)mm, the total drafting multiple being 6-9 times, the rear zone drafting multiple being 1.15-1.25 times, and the twist coefficient being 80-100.

[0025] Optionally, in step S1, the spinning process includes: spinning at a temperature of 20-25°C and a humidity of 65%-75%, the basis weight of the spinning is 1.9-2.0g / 10m, the front roller speed is 200r / min, the roller gauge is (18-20)mm×(28-31)mm, the total drafting multiple is 7-9 times, the rear zone drafting multiple is 1.12-1.28 times, and the twist coefficient is 320-360.

[0026] In the present invention, seaweed fiber and lyocell fiber are blended by reasonably designed blowing and carding, drawing, roving and spinning processes to obtain high-quality blended yarn, wherein the blowing and carding process takes into account both the combing effect and the protection of the fiber structure, and adopts the method of increasing the speed ratio of the cylinder and the licker-in roller and reducing the spacing between the cylinder, the licker-in roller and the doffer to increase the fiber transfer rate, so as to achieve the purpose of sufficient combing, and can improve the phenomenon of fiber return and cotton knot; the drawing process improves the straightening parallelism of the fiber by improving the process, requiring that the total drafting multiple cannot be greater than the drawing multiple, and the values ​​of the roller spacing and the back zone drafting multiple need to be higher, and at the same time, in order to achieve the increase of the yarn dryness level, the reduction of the single yarn strength unevenness and the low cotton knot rate The purpose is to adopt the method of "reverse drafting, light weight, and medium spacing" during the second-pass drawing, so that the drafting multiple during the second-pass drawing is smaller than the drafting multiple during the first-pass drawing; the roving process can increase the probability of the seaweed fiber transferring to the yarn by increasing the roving twist coefficient, which can reduce the hairiness index. At the same time, in order to prevent entanglement, the use of leather rollers with good winding properties and the appropriate reduction of the drafting multiple in the back zone can increase the probability of the tightly structured yarn entering the main drafting zone, and to a certain extent, can improve the yarn uniformity; the spinning process can improve the yarn quality by increasing the twist coefficient, increasing the roller spacing in the back zone, reducing the drafting multiple in the back zone, slowing down the spinning speed, and appropriately increasing the temperature and humidity in the workshop.

[0027] Optionally, in step S2, the mass ratio of the treatment liquid to the blended yarn is 1 to 5:100.

[0028] Optionally, in step S2, the bath ratio of the oscillation treatment is 1:10-30.

[0029] Optionally, in step S2, the temperature of the oscillation treatment is 30-60° C., and the time of the oscillation treatment is 10-30 min.

[0030] Optionally, in step S2, the washing temperature is 25-35° C., and the washing time is 5-10 min.

[0031] Optionally, in step S3, the dye includes at least one of reactive dyes, direct dyes, acid dyes and natural dyes.

[0032] In the present invention, dyes used for dyeing the modified blended yarn after blending and modifying the seaweed fiber and the lyocell fiber include but are not limited to anionic dyes such as reactive dyes, direct dyes, acid dyes and natural dyes. These anionic dyes have good adhesion to the modified blended yarn with quaternary ammonium groups on the seaweed fiber and the lyocell fiber after the etherification reaction, so that salt-free dyeing can be smoothly performed to avoid damage to the seaweed fiber. Among them, the natural dye includes indigo dye.

[0033] Optionally, in step S3, the mass ratio of the dye to the modified blended yarn is 1 to 4:100.

[0034] Optionally, in step S3, the bath ratio of the dyeing treatment is 1:10-30.

[0035] Optionally, in step S3, the insulation temperature is 75-85° C., and the dyeing treatment time is 30-40 minutes.

[0036] Optionally, in the cationic color-fixing agent aqueous solution in step S4, the concentration of the cationic color-fixing agent is 1 to 3 g / L.

[0037] In the present invention, when the modified blended yarn after dyeing is subjected to a color fixing treatment, different cationic color fixing agents are used in a targeted manner according to the different types of dyes used. For example, if the dye is a reactive dye, the cationic color fixing agent used includes a quaternized reactive color fixing agent (such as a condensation product of trimethylamine or diethylenetriamine and epichlorohydrin, monoallyldimethylammonium chloride and diallyldimethylammonium chloride, etc.), which has a cationic group and can ensure the dyeing rate, so that the treated fabric has bright color, good chlorine fastness, and good light fastness and perspiration fastness; if the dye is a direct dye or an acid dye, a cationic surfactant (such as hexadecylpyridinium chloride) is used as a color fixing agent, which can improve the wet processing fastness and water immersion fastness of the dye.

[0038] Optionally, in step S4, the bath ratio of the color fixing treatment is 1:10-30.

[0039] Optionally, in step S4, the temperature of the color fixing treatment is 40 to 80° C., and the time of the color fixing treatment is 10 to 20 minutes.

[0040] Optionally, in step S4, the drying temperature is 40-80°C.

[0041] Optionally, in step S4, the cleaning includes: placing the modified blended yarn after the color fixing treatment in a neutral detergent solution, shaking it, and then washing it.

[0042] Optionally, the concentration of the neutral detergent solution is 5 to 10 g / L.

[0043] Optionally, the temperature of the oscillation treatment is 85 to 95° C., and the time of the oscillation treatment is 10 to 20 minutes.

[0044] Optionally, the washing temperature is 35-45° C., and the washing time is 5-15 min.

[0045] In another aspect, the present invention also provides a blended yarn of algae fiber and lyocell fiber produced by the preparation method as described above.

[0046] Beneficial effects of the present invention:

[0047] The invention performs modification treatment on the blended yarn, that is, adopts a cationic etherifying agent to perform an etherification reaction on the blended yarn obtained by blending the seaweed fiber and the lyocell fiber, introduces a quaternary ammonium group into the blended yarn, enables the blended yarn to be dyed without salt, and introduces calcium chloride to avoid the seaweed fiber from being damaged by alkali solution, thereby ensuring various properties of the seaweed fiber, so as to smoothly dye and fix the blended yarn, and reduces fiber damage and the generation of hairiness and cotton knots through reasonably designed cleaning, carding, drawing, roving and spinning processes during blending, improves the yarn uniformity, reduces the single yarn strength unevenness, improves the yarn quality, and enables the prepared seaweed fiber and lyocell fiber blended yarn to have higher color fastness and good spinnability, is convenient for making the blended yarn into various textiles, and gives various textiles a variety of excellent properties, thereby greatly promoting the application of the seaweed fiber in the blended fabric. DETAILED DESCRIPTION

[0048] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0049] The invention provides a method for preparing a blended yarn of seaweed fiber and lyocell fiber. The preparation method comprises blending, dyeing and color fixing. Between blending and dyeing, the method further comprises modifying the obtained blended yarn. The treatment liquid used in the modification treatment comprises a cationic etherifying agent 3-chloro-2-hydroxypropyltrimethylammonium chloride, sodium hydroxide and calcium chloride.

[0050] The mass fraction of 3-chloro-2-hydroxypropyltrimethylammonium chloride in the treatment solution is 2wt% to 4wt%, the concentration of sodium hydroxide is 10 to 15g / L, and the concentration of calcium chloride is 0.1 to 1.5g / L.

[0051] In one embodiment of the present invention, a method for preparing a blended yarn of seaweed fiber and lyocell fiber is provided, which specifically comprises the following steps:

[0052] S1, blending: taking the seaweed fiber and the lyocell fiber as spinning raw materials and sequentially performing the processes of blowing, carding, drawing, roving and spinning according to the blending ratio of the seaweed fiber to the lyocell fiber of 15-25:75-85 to obtain a blended yarn;

[0053] S2, modification treatment: preparing a treatment solution including a cationic etherifying agent 3-chloro-2-hydroxypropyltrimethylammonium chloride, sodium hydroxide and calcium chloride, using the treatment solution to prepare a modified treatment solution according to a mass ratio of the treatment solution to the blended yarn of 1 to 5:100, and putting the obtained blended yarn into the modified treatment solution according to a bath ratio of 1:10 to 30, shaking the yarn at 30 to 60° C. for 10 to 30 minutes, and then washing the yarn at a temperature of 25 to 35° C. for 5 to 10 minutes to obtain a modified blended yarn;

[0054] S3, dyeing: weigh the dye according to the mass ratio of the dye to the modified blended yarn of 1 to 4:100, and measure the distilled water according to the bath ratio of 1:10 to 30 to prepare a dye solution, put the modified blended yarn into the dye solution at room temperature, then heat the dye solution, and then keep it at 75 to 85° C. for dyeing for 30 to 40 minutes;

[0055] S4. Color fixing: prepare a cationic color fixing agent aqueous solution, wherein the concentration of the cationic color fixing agent is 1-3 g / L, and put the dyed modified blended yarn into the cationic color fixing agent aqueous solution at a bath ratio of 1:10-30 at room temperature, and heat it to 40-80°C for color fixing treatment for 10-20 min, then place the modified blended yarn after the color fixing treatment in a neutral detergent solution with a concentration of 5-10 g / L, oscillate at 85-95°C for 10-20 min, then wash at a temperature of 35-45°C for 5-15 min, and dry it in an oven at 40-80°C to obtain a blended yarn of seaweed fiber and lyocell fiber.

[0056] The dye in step S3 includes at least one of reactive dyes, direct dyes, acid dyes and natural dyes, and the natural dyes include indigo dyes.

[0057] In some embodiments of the present invention, the cleaning and combing process in step S1 includes: opening, blending and combing the seaweed fiber and the lyocell fiber in sequence at a temperature of 20-25°C and a humidity of 55%-65%, wherein the speed of the opening roller during opening is 270-290 r / min, the speed of the cotton feeding cord is 2.3-2.5 m / min, the speed of the stripping roller is 180-200 r / min, and the opening ratio is 360-380 times; the speed of the oblique nail cord during blending is 22-25 m / min, and the speed of the stripping roller is 88-100 r / min The speed of the small opening roller is 370-400r / min, the distance between the corner nail curtain and the cotton roller is 58-62mm, and the distance between the corner nail curtain and the cotton pressing curtain is 68-72mm; the cover speed during carding is 190-210mm / min, the cylinder speed is 450-500r / min, the cylinder licker-in roller speed ratio is 1.9-2.1:1, the distance between the cylinder and the cover is 0.20-0.25mm, the distance between the cylinder and the licker-in roller is 0.17-0.19mm, the distance between the cylinder and the doffer is 0.14-0.16mm, and the total draft multiple is 55-65 times.

[0058] In some embodiments of the present invention, the drawing process in step S1 includes: performing the first-pass merging and the second-pass merging at a temperature of 20-25°C and a humidity of 55%-65%, wherein the slivers in the first-pass merging are 6-8, the basis weight is 15-17g / 5m, the roller gauge is (8-10) mm×(18-20) mm, the total stretching multiple is (4-5)×(1.5-1.6) times, and the stretching multiple in the rear zone is 1.55-1.65 times; the slivers in the second-pass merging are 4-6, the basis weight is 15-17g / 5m, the roller gauge is (8-10) mm×(18-20) mm, the total stretching multiple is (4-5)×(1.2-1.4) times, and the stretching multiple in the rear zone is 1.2-1.3 times.

[0059] In some embodiments of the present invention, the roving process in step S1 includes: roving at a temperature of 20-25°C and a humidity of 55%-65%, wherein the quantitative roving is 4.5-5.0g / 10m, the front roller speed is 174-182r / min, the roller gauge is (8-10)mm×(28-31)mm×(38-42)mm, the total drafting multiple is 6-9 times, the rear zone drafting multiple is 1.15-1.25 times, and the twist coefficient is 80-100.

[0060] In some embodiments of the present invention, the spinning process in step S1 includes: spinning at a temperature of 20-25°C and a humidity of 65%-75%, wherein the basis weight during spinning is 1.9-2.0g / 10m, the front roller speed is 200r / min, the roller gauge is (18-20)mm×(28-31)mm, the total drafting multiple is 7-9 times, the rear zone drafting multiple is 1.12-1.28 times, and the twist coefficient is 320-360.

[0061] The present invention also provides a blended yarn of algae fiber and lyocell fiber prepared by the preparation method as described above.

[0062] The present invention is described in detail below by specific examples. It should be understood that the following examples are only used to specifically illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention belong to the scope of protection of the present invention. The specific process parameters of the following examples are only an example in a suitable range, that is, those skilled in the art can make selections within a suitable range through the description of this article, and are not limited to the specific values ​​​​exemplified below. It should be understood that in the following examples, only the specific circumstances of using reactive dyes and their corresponding cationic color fixing agents are listed. Those skilled in the art can also choose, such as: direct dyes, acid dyes and natural dyes, etc. and their respective corresponding cationic color fixing agents for blending seaweed fiber and lyocell fiber and dyeing and fixing the modified blended yarn after modification.

[0063] In the present invention, the reactive dye used is a monochloro-s-triazine type, i.e., a K-type reactive dye, which is suitable for dyeing at a high temperature of 75 to 85° C. At the same time, the color fixing agent of the present invention uses a quaternized reactive color fixing agent, monoallyl dimethyl ammonium chloride or diallyl dimethyl ammonium chloride. In addition, the neutral detergent used in the washing step after the color fixing treatment is a laundry detergent.

[0064] In the present invention, the DSBL-01 type cleaning and carding combined machine is used in the cleaning and carding process, and the DSBL-01 type cleaning and carding combined machine includes a DSOP-01 type opening machine, a DSFa-01 type cotton conveying fan, a DSMi-01 type cotton mixing machine, a DSFe-01 type automatic cotton feeding machine and a DSCa-11A type cotton carding machine; the DSDr-01 type digital small sample drawing machine is used in the drawing process; the FA498-12 type roving frame is used in the roving process; and the BST518-45 type roving frame is used in the spinning process.

[0065] Example 1

[0066] This embodiment provides a method for preparing a blended yarn of seaweed fiber and lyocell fiber, which specifically comprises the following steps:

[0067] S1, blending: taking the seaweed fiber and the lyocell fiber as spinning raw materials and sequentially performing blowing, carding, drawing, roving and spinning processes according to the blending ratio of the seaweed fiber to the lyocell fiber of 20:80 to obtain a blended yarn;

[0068] The cleaning and combing process is to open, blend and comb the seaweed fiber and lyocell fiber in sequence at a temperature of 22°C and a humidity of 60%. The speed of the opening roller during opening is 280r / min, the speed of the cotton feeding cord is 2.4m / min, the speed of the stripping roller is 200r / min, and the opening ratio is 360 times; the speed of the oblique nail cord during blending is 24m / min, the speed of the stripping roller is 90r / min, and the small opening ratio is 1.5 times. The loose roller speed is 400r / min, the distance between the corner nail curtain and the cotton roller is 60mm, and the distance between the corner nail curtain and the cotton pressing curtain is 70mm; the flat plate speed during carding is 200mm / min, the cylinder speed is 500r / min, the cylinder licker-in roller speed ratio is 2.0:1, the cylinder and flat plate distance is 0.25mm, the cylinder and licker-in roller distance is 0.18mm, the cylinder and doffer distance is 0.15mm, and the total draft multiple is 63 times;

[0069] The drawing process is to carry out the first-pass merging and the second-pass merging at a temperature of 22°C and a humidity of 60%. The first-pass merging has 8 slivers, a basis weight of 16.3g / 5m, a roller gauge of 10mm×20mm, a total drafting multiple of 4.875×1.6 times, and a rear-zone drafting multiple of 1.6 times; the second-pass merging has 4 to 6 slivers, a basis weight of 16.2g / 5m, a roller gauge of 9mm×18mm, a total drafting multiple of 5×1.4 times, and a rear-zone drafting multiple of 1.24 times;

[0070] The roving process includes: roving at a temperature of 22°C and a humidity of 60%, wherein the basis weight during roving is 4.5g / 10m, the front roller speed is 175r / min, the roller gauge is 10mm×29mm×40mm, the total drafting multiple is 8 times, the rear zone drafting multiple is 1.23 times, and the twist coefficient is 95;

[0071] The spinning process includes: spinning at a temperature of 22°C and a humidity of 70%, wherein the basis weight during spinning is 1.95g / 10m, the front roller speed is 200r / min, the roller gauge is 18mm×30mm, the total drafting multiple is 8 times, the rear zone drafting multiple is 1.18 times, and the twist coefficient is 350;

[0072] S2, modification treatment: prepare a treatment solution with a mass fraction of 2wt% of cationic etherifying agent 3-chloro-2-hydroxypropyltrimethylammonium chloride, a sodium hydroxide concentration of 10g / L and a calcium chloride concentration of 0.1g / L, prepare a modified treatment solution using the treatment solution according to a mass ratio of the treatment solution to the blended yarn of 3:100, and put the obtained blended yarn into the modified treatment solution according to a bath ratio of 1:15, shake it at 60°C for 20min, and then wash it at 30°C for 5min to obtain a modified blended yarn;

[0073] S3, dyeing: weighing K-type reactive dye according to the mass ratio of dye to modified blended yarn of 3:100, and measuring distilled water according to the bath ratio of 1:20 to prepare dye solution, putting the modified blended yarn into the dye solution at room temperature, then heating the dye solution, and then keeping it at 80°C for dyeing treatment for 35 minutes;

[0074] S4. Color fixing: prepare a cationic color fixing agent aqueous solution, wherein the concentration of the cationic color fixing agent monoallyldimethylammonium chloride is 2g / L, and put the dyed modified blended yarn into the cationic color fixing agent aqueous solution at a bath ratio of 1:20 at room temperature, and heat it to 60°C for color fixing treatment for 15 minutes, then place the modified blended yarn after the color fixing treatment in a neutral detergent solution with a concentration of 8g / L, oscillate it at 90°C for 15 minutes, then wash it at 40°C for 10 minutes, and dry it in an oven at 60°C to obtain a blended yarn of seaweed fiber and lyocell fiber.

[0075] Example 2

[0076] This embodiment provides a method for preparing a blended yarn of seaweed fiber and lyocell fiber, which specifically comprises the following steps:

[0077] S1, blending: taking the seaweed fiber and the lyocell fiber as spinning raw materials and sequentially performing the blowing, carding, drawing, roving and spinning processes according to the blending ratio of the seaweed fiber to the lyocell fiber of 15:85 to obtain a blended yarn;

[0078] The cleaning and combing process is to open, blend and comb the seaweed fiber and lyocell fiber in sequence at a temperature of 20°C and a humidity of 55%. The speed of the opening roller during opening is 270r / min, the speed of the cotton feeding cord is 2.3m / min, the speed of the stripping roller is 190r / min, and the opening ratio is 370 times; the speed of the oblique nail cord during blending is 22m / min, the speed of the stripping roller is 88r / min, and the small opening ratio is 1.5 times. The loose roller speed is 380r / min, the distance between the corner nail curtain and the cotton roller is 58mm, and the distance between the corner nail curtain and the cotton pressing curtain is 68mm; the flat plate speed during carding is 190mm / min, the cylinder speed is 480r / min, the cylinder licker-in roller speed ratio is 1.9:1, the cylinder and flat plate distance is 0.22mm, the cylinder and licker-in roller distance is 0.17mm, the cylinder and doffer distance is 0.14mm, and the total draft multiple is 55 times;

[0079] The drawing process is to carry out the first-pass merging and the second-pass merging at a temperature of 20°C and a humidity of 55%. The first-pass merging has 7 slivers with a basis weight of 15g / 5m, a roller gauge of 9mm×19mm, a total drafting multiple of 4×1.5 times, and a rear-zone drafting multiple of 1.55 times; the second-pass merging has 4 slivers with a basis weight of 15g / 5m, a roller gauge of 8mm×19mm, a total drafting multiple of 4×1.2 times, and a rear-zone drafting multiple of 1.2 times.

[0080] The roving process includes: roving at a temperature of 20°C and a humidity of 55%, wherein the basis weight of the roving is 4.8g / 10m, the front roller speed is 174r / min, the roller gauge is 8mm×28mm×38mm, the total drafting multiple is 6 times, the rear zone drafting multiple is 1.15 times, and the twist coefficient is 80;

[0081] The spinning process includes: spinning at a temperature of 20°C and a humidity of 65%, wherein the basis weight during spinning is 1.9 g / 10 m, the front roller speed is 200 r / min, the roller gauge is 18 mm×28 mm, the total drafting multiple is 7 times, the rear zone drafting multiple is 1.12 times, and the twist coefficient is 320;

[0082] S2, modification treatment: prepare a treatment solution with a mass fraction of 3 wt% of cationic etherifying agent 3-chloro-2-hydroxypropyltrimethylammonium chloride, a sodium hydroxide concentration of 12 g / L and a calcium chloride concentration of 0.5 g / L, prepare a modified treatment solution using the treatment solution according to a mass ratio of the treatment solution to the blended yarn of 5:100, and put the obtained blended yarn into the modified treatment solution according to a bath ratio of 1:10, shake it at 45°C for 10 minutes, and then wash it at 25°C for 10 minutes to obtain a modified blended yarn;

[0083] S3, dyeing: weighing K-type reactive dye according to the mass ratio of dye to modified blended yarn of 1:100, and measuring distilled water according to the bath ratio of 1:10 to prepare dye solution, putting the modified blended yarn into the dye solution at room temperature, then heating the dye solution, and then keeping it at 75°C for dyeing treatment for 40 minutes;

[0084] S4. Color fixing: prepare a cationic color fixing agent aqueous solution, wherein the concentration of the cationic color fixing agent diallyldimethylammonium chloride is 1g / L, and put the dyed modified blended yarn into the cationic color fixing agent aqueous solution at a bath ratio of 1:10 at room temperature, and heat it to 40°C for color fixing treatment for 20 minutes, then place the modified blended yarn after the color fixing treatment in a neutral detergent solution with a concentration of 5g / L, oscillate it at 85°C for 20 minutes, then wash it at 35°C for 15 minutes, and dry it in an oven at 40°C to obtain a blended yarn of seaweed fiber and lyocell fiber.

[0085] Example 3

[0086] This embodiment provides a method for preparing a blended yarn of seaweed fiber and lyocell fiber, which specifically comprises the following steps:

[0087] S1, blending: taking the seaweed fiber and the lyocell fiber as spinning raw materials and sequentially performing blowing, carding, drawing, roving and spinning processes according to the blending ratio of the seaweed fiber to the lyocell fiber of 25:75 to obtain a blended yarn;

[0088] The cleaning and combing process is to open, blend and comb the seaweed fiber and lyocell fiber in sequence at a temperature of 25°C and a humidity of 65%. The speed of the opening roller during opening is 290r / min, the speed of the cotton feeding cord is 2.5m / min, the speed of the stripping roller is 180r / min, and the opening ratio is 380 times; the speed of the oblique nail cord during blending is 25m / min, the speed of the stripping roller is 100r / min, and the small opening ratio is 1.5 times. The loose roller speed is 370r / min, the distance between the corner nail curtain and the cotton roller is 62mm, and the distance between the corner nail curtain and the cotton pressing curtain is 72mm; the flat plate speed during carding is 210mm / min, the cylinder speed is 450r / min, the cylinder licker-in roller speed ratio is 2.1:1, the cylinder and flat plate distance is 0.20mm, the cylinder and licker-in roller distance is 0.19mm, the cylinder and doffer distance is 0.16mm, and the total draft multiple is 65 times;

[0089] The drawing process is to carry out the first-pass merging and the second-pass merging at a temperature of 25°C and a humidity of 65%. The first-pass merging has 6 slivers, a basis weight of 17g / 5m, a roller gauge of 8mm×18mm, a total drafting multiple of 5×1.6 times, and a rear zone drafting multiple of 1.65 times; the second-pass merging has 4 to 6 slivers, a basis weight of 17g / 5m, a roller gauge of 10mm×20mm, a total drafting multiple of 5×1.3 times, and a rear zone drafting multiple of 1.23 times;

[0090] The roving process includes: roving at a temperature of 25°C and a humidity of 65%, wherein the basis weight during roving is 5.0 g / 10 m, the front roller speed is 182 r / min, the roller gauge is 9 mm×31 mm×42 mm, the total drafting multiple is 9 times, the rear zone drafting multiple is 1.25 times, and the twist coefficient is 100;

[0091] The spinning process includes: spinning at a temperature of 25°C and a humidity of 75%, wherein the basis weight during spinning is 2.0 g / 10 m, the front roller speed is 200 r / min, the roller gauge is 20 mm×31 mm, the total drafting multiple is 9 times, the rear zone drafting multiple is 1.28 times, and the twist coefficient is 360;

[0092] S2, modification treatment: prepare a treatment solution with a mass fraction of 4wt% of cationic etherifying agent 3-chloro-2-hydroxypropyltrimethylammonium chloride, a sodium hydroxide concentration of 15g / L and a calcium chloride concentration of 1.5g / L, prepare a modified treatment solution using the treatment solution according to a mass ratio of the treatment solution to the blended yarn of 5:100, and put the obtained blended yarn into the modified treatment solution according to a bath ratio of 1:30, perform an oscillation treatment at 30°C for 30min, and then wash at 35°C for 10min to obtain a modified blended yarn;

[0093] S3, dyeing: weighing K-type reactive dye according to the mass ratio of dye to modified blended yarn of 4:100, and measuring distilled water according to the bath ratio of 1:30 to prepare dye solution, putting the modified blended yarn into the dye solution at room temperature, then heating the dye solution, and then keeping it at 85°C for dyeing treatment for 30 minutes;

[0094] S4. Color fixing: prepare a cationic color fixing agent aqueous solution, wherein the concentration of the cationic color fixing agent monoallyldimethylammonium chloride is 3g / L, and put the dyed modified blended yarn into the cationic color fixing agent aqueous solution at a bath ratio of 1:30 at room temperature, and heat it to 80°C for color fixing treatment for 10 minutes, then place the modified blended yarn after the color fixing treatment in a neutral detergent solution with a concentration of 10g / L, oscillate at 95°C for 10 minutes, then wash at 45°C for 5 minutes, and dry in an oven at 80°C to obtain a blended yarn of seaweed fiber and lyocell fiber.

[0095] Comparative Example 1

[0096] The difference between this comparative example and Example 1 is that the blended yarn is not modified, and the specific steps are as follows:

[0097] S1, blending: taking the seaweed fiber and the lyocell fiber as spinning raw materials and sequentially performing blowing, carding, drawing, roving and spinning processes according to the blending ratio of the seaweed fiber to the lyocell fiber of 20:80 to obtain a blended yarn;

[0098] The blowing, carding, drawing, roving and spinning processes are the same as those in Example 1.

[0099] S2, dyeing: weighing K-type reactive dye according to the mass ratio of dye to modified blended yarn of 3:100, and measuring distilled water according to the bath ratio of 1:20 to prepare dye solution, putting the blended yarn into the dye solution at room temperature, then heating the dye solution, and then keeping it at 80°C for dyeing treatment for 35 minutes;

[0100] S3. Color fixing: prepare a cationic color fixing agent aqueous solution, wherein the concentration of the cationic color fixing agent monoallyldimethylammonium chloride is 2g / L, and put the dyed modified blended yarn into the cationic color fixing agent aqueous solution at a bath ratio of 1:20 at room temperature, and heat it to 60°C for color fixing treatment for 15 minutes, then place the modified blended yarn after the color fixing treatment in a neutral detergent solution with a concentration of 8g / L, oscillate it at 90°C for 15 minutes, then wash it at 40°C for 10 minutes, and dry it in an oven at 60°C to obtain a blended yarn of seaweed fiber and lyocell fiber.

[0101] Comparative Example 2

[0102] The difference between this comparative example and Example 1 is that calcium chloride is not added when the blended yarn is modified. The specific steps are as follows:

[0103] S2, modification treatment: prepare a treatment solution with a mass fraction of 2wt% of cationic etherifying agent 3-chloro-2-hydroxypropyltrimethylammonium chloride and a sodium hydroxide concentration of 10g / L, use the treatment solution to prepare a modified treatment solution according to a mass ratio of the treatment solution to the blended yarn of 3:100, and put the obtained blended yarn into the modified treatment solution according to a bath ratio of 1:15, shake it at 60°C for 20min, and then wash it at 30°C for 5min to obtain a modified blended yarn;

[0104] The remaining steps are the same as those in Example 1.

[0105] Example 4

[0106] This embodiment provides a method for preparing a blended yarn of seaweed fiber and lyocell fiber, which is implemented according to the preparation method of Example 1. The difference between the method and Example 1 is that:

[0107] In step S1, in the cleaning and combing process, the opening ratio is 372 times and the total drafting multiple is 57 times; in the coarse yarn process, the quantitative is 4.9g / 10m, the front roller speed is 180r / min, the rear zone drafting multiple is 1.19 times, and the twist coefficient is 88; in the fine yarn process, the rear zone drafting multiple is 1.16 times, and the twist coefficient is 330.

[0108] The remaining steps are the same as those in Example 1.

[0109] Example 5

[0110] This embodiment provides a method for preparing a blended yarn of seaweed fiber and lyocell fiber, which is implemented according to the preparation method of Example 1. The difference between the method and Example 1 is that:

[0111] In step S1, in the cleaning and combing process, the opening ratio is 369 times and the total drafting multiple is 60 times; in the coarse yarn process, the quantitative is 4.75g / 10m, the front roller speed is 178r / min, the rear zone drafting multiple is 1.19 times, and the twist coefficient is 90; in the fine yarn process, the rear zone drafting multiple is 1.15 times, and the twist coefficient is 340.

[0112] The remaining steps are the same as those in Example 1.

[0113] Example 6

[0114] This embodiment provides a method for preparing a blended yarn of seaweed fiber and lyocell fiber, which is implemented according to the preparation method of Example 1. The difference between the method and Example 1 is that:

[0115] In step S1, in the cleaning and combing process, the opening ratio is 380 times and the total drafting multiple is 65 times; in the coarse yarn process, the front roller speed is 174r / min, the rear zone drafting multiple is 1.25 times, and the twist coefficient is 80; in the fine yarn process, the rear zone drafting multiple is 1.12 times and the twist coefficient is 320.

[0116] The remaining steps are the same as those in Example 1.

[0117] Example 7

[0118] This embodiment provides a method for preparing a blended yarn of seaweed fiber and lyocell fiber, which is implemented according to the preparation method of Example 1. The difference between the method and Example 1 is that:

[0119] In step S1, in the cleaning and combing process, the opening ratio is 375 times and the total drafting multiple is 55 times; in the coarse yarn process, the quantitative is 4.25g / 10m, the front roller speed is 182r / min, the rear zone drafting multiple is 1.25 times, and the twist coefficient is 100; in the fine yarn process, the rear zone drafting multiple is 1.15 times, and the twist coefficient is 350.

[0120] The remaining steps are the same as those in Example 1.

[0121] Comparative Example 3

[0122] This comparative example provides a method for preparing a blended yarn of seaweed fiber and lyocell fiber, which is implemented according to the preparation method of Example 1. The difference between the comparative example and Example 1 is that:

[0123] In step S1, the twist coefficient is 50 in the roving process.

[0124] The remaining steps are the same as those in Example 1.

[0125] Comparative Example 4

[0126] This comparative example provides a method for preparing a blended yarn of seaweed fiber and lyocell fiber, which is implemented according to the preparation method of Example 1. The difference between the comparative example and Example 1 is that:

[0127] In step S1, the drafting multiple in the rear zone of the roving process is 2 times.

[0128] The remaining steps are the same as those in Example 1.

[0129] Performance Testing

[0130] The seaweed fiber and lyocell fiber blended yarns prepared in Examples 1 to 7 and Comparative Examples 2 to 4 were sampled for performance testing, wherein the breaking strength (dry) of the seaweed fiber and lyocell fiber blended yarn was tested according to GB / T 3916-2013 "Determination of breaking strength and elongation of single yarn of textile packaged yarn"; the yarn uniformity of the seaweed fiber and lyocell fiber blended yarn was tested according to GB / T 3292.1-2008 "Test method for uneven yarn length of textiles - capacitance method"; the hairiness index of the seaweed fiber and lyocell fiber blended yarn was tested according to FZ / T 01086-2020 "Determination method for hairiness of textile yarns - projection counting method", and the above test results are included in Table 1.

[0131] The seaweed fiber and lyocell fiber blended yarns prepared in Examples 1 to 3 and Comparative Examples 1 to 2 were woven using the same knitting or weaving process to prepare seaweed fiber and lyocell fiber blended textiles, and the prepared seaweed fiber and lyocell fiber blended textiles were sampled for surface color depth and color fastness tests, wherein the water fastness was tested according to GB / T5713-2013 "Textiles - Tests for Color Fastness - Color Fastness to Water"; the rubbing fastness was tested according to GB / T 3920-2008 "Textiles - Tests for Color Fastness - Color Fastness to Rubbing"; the color fastness to perspiration was tested according to GB / T 3922-2013 "Textiles - Tests for Color Fastness - Color Fastness to Perspiration", and the above test results are recorded in Table 2.

[0132] Table 1 Test results of seaweed fiber and lyocell fiber blended yarns of Examples 1 to 7 and Comparative Examples 2 to 4

[0133] source Breaking strength (dry) / (cN / dtex) Strip uniformity (%) 2mm hairiness index Example 1 18.17 35.67 2.1 Example 2 17.95 34.47 2.7 Example 3 18.03 35.61 2.3 Example 4 17.87 33.98 2.5 Example 5 17.95 36.80 2.6 Example 6 18.26 36.86 3.1 Example 7 17.58 35.93 2.8 Comparative Example 2 13.41 35.32 2.3 Comparative Example 3 16.97 34.68 4.1 Comparative Example 4 16.85 23.47 2.4

[0134] Table 2 Test results of seaweed fiber and lyocell fiber blended textiles of Examples 1 to 3 and Comparative Examples 1 to 2

[0135]

[0136] From the analysis of Table 1, it can be seen that the breaking strength (dry) of the blended yarn of seaweed fiber and lyocell fiber of Examples 1 to 7 is all above 17.58 cN / dtex, the yarn evenness is all above 33.98%, and the 2 mm hairiness index is all below 3.1. This result shows that the preparation method of the present invention reduces the fiber damage of the blended yarn of seaweed fiber and lyocell fiber, improves the yarn quality, and makes the prepared blended yarn of seaweed fiber and lyocell fiber have good mechanical properties and spinnability.

[0137] From the analysis of Table 1, it can be seen that the 2 mm hairiness index of the blended yarn of algae fiber and lyocell fiber in Example 1 is 2.1, while the 2 mm hairiness index of the blended yarn of algae fiber and lyocell fiber in Comparative Example 3 is 4.1, which is much higher than that in Example 1. This result shows that the preparation method of the present invention can reduce the hairiness index of the blended yarn by increasing the roving twist coefficient during the roving process.

[0138] From the analysis of Table 1, it can be seen that the yarn uniformity of the blended yarn of seaweed fiber and lyocell fiber in Example 1 is 35.67, while the yarn uniformity of the blended yarn of seaweed fiber and lyocell fiber in Comparative Example 4 is 23.47, which is much lower than that in Example 1. This result shows that the preparation method of the present invention can improve the yarn uniformity of the blended yarn by reducing the drafting multiple in the back zone during the roving process.

[0139] From the analysis of Table 2, it can be seen that the surface color depth of the algae fiber and lyocell fiber blended textiles prepared from the algae fiber and lyocell fiber blended yarns of Examples 1 to 3 is 28.6K / S or above, the color difference depth value is 0.78K / S or below, and the color fastness to water, color fastness to friction and color fastness to perspiration are all at level 4 or above. The results show that the algae fiber and lyocell fiber blended yarn prepared by the preparation method of the present invention has good dyeing effect and high color fastness.

[0140] From the analysis of Table 2, it can be seen that the surface color depth of the algae fiber and lyocell fiber blended textile prepared from the blended yarn of algae fiber and lyocell fiber in Comparative Example 1 is 20.2K / S, which is significantly lower than that in Example 1; the color difference depth value is 1.32K / S, which is significantly higher than that in Example 1; and the color fastness to water, color fastness to friction and color fastness to perspiration are significantly lower than that in Example 1. The results show that the preparation method of the present invention can improve the dyeing effect of the blended yarn, increase the dye affinity, and thus improve the color fastness by modifying the blended yarn of algae fiber and lyocell fiber.

[0141] Combining Table 1 and Table 2, it can be seen that the breaking strength (dry) of the blended yarn of algae fiber and lyocell fiber in Example 1 is 18.17 cN / dtex, while the breaking strength (dry) of the blended yarn of algae fiber and lyocell fiber in Comparative Example 2 is 13.41 cN / dtex, which is much lower than that in Example 1; and the algae fiber and lyocell fiber blended textiles prepared from the blended yarn of algae fiber and lyocell fiber in Comparative Example 2 have a surface color depth of 25.8 K / S, which is lower than that in Example 1, a color difference depth of 0.89 K / S, which is higher than that in Example 1, and color fastness to water, color fastness to friction, and color fastness to perspiration are all lower than those in Example 1 to varying degrees. The results show that when the blended yarn prepared from algae fiber and lyocell fiber is modified by the present invention, the addition of calcium chloride can prevent the alkali solution from damaging the algae fiber, thereby ensuring its breaking strength, and at the same time ensuring the dyeing effect of the blended yarn.

[0142] In summary, the present invention performs a modification treatment on the blended yarn obtained by blending seaweed fiber and lyocell fiber so that the blended yarn can be dyed without salt, and introduces calcium chloride to avoid damage to the seaweed fiber caused by alkali solution during the modification treatment, thereby ensuring various properties of the seaweed fiber. At the same time, a reasonably designed cleaning and carding, drawing, roving and spinning process is adopted to reduce fiber damage and the generation of hairiness and cotton knots of the blended yarn of seaweed fiber and lyocell fiber, improve the yarn uniformity, reduce the single yarn strength unevenness, improve the yarn quality, make the blended yarn of seaweed fiber and lyocell fiber have good mechanical properties, improve the spinnability and salt resistance of the blended yarn, and improve the color fastness of the blended textiles of seaweed fiber and lyocell fiber, so that it can be used to produce daily clothing, etc., which greatly promotes the application of seaweed fiber in the field of textiles.

[0143] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for preparing a blended yarn of seaweed fiber and lyocell fiber, characterized in that: The preparation method includes blending, dyeing and fixing, and the blending and dyeing also include modifying the obtained blended yarn, and the treatment liquid used in the modification treatment includes a cationic etherifying agent, sodium hydroxide and calcium chloride, and the cationic etherifying agent includes 3-chloro-2-hydroxypropyltrimethylammonium chloride; The preparation method specifically comprises the following steps: S1, blending: using algae fiber and lyocell fiber as spinning raw materials, sequentially performing blowing, carding, drawing, roving and spinning processes to obtain blended yarn; The roving process comprises: roving at a temperature of 20-25° C. and a humidity of 55%-65%, wherein the roving weight is 4.5-5.0 g / 10 m, the front roller speed is 174-182 r / min, the roller gauge is (8-10) mm×(28-31) mm×(38-42) mm, the total drafting multiple is 6-9 times, the rear zone drafting multiple is 1.15-1.25 times, and the twist coefficient is 80-100; S2, modification treatment: preparing a modification treatment solution using a treatment liquid, placing the obtained blended yarn into the modification treatment solution, performing an oscillation treatment, and washing to obtain a modified blended yarn; S3, dyeing: weighing dye and distilled water respectively to prepare dye solution, putting the modified blended yarn into the dye solution at room temperature, then heating the dye solution, and then keeping the temperature to perform dyeing treatment; S4, color fixing: preparing a cationic color fixing agent aqueous solution, putting the dyed modified blended yarn into the cationic color fixing agent aqueous solution at room temperature for color fixing treatment, and obtaining the seaweed fiber and lyocell fiber blended yarn after washing and drying.

2. The preparation method according to claim 1, characterized in that: In the treatment liquid, the mass fraction of the 3-chloro-2-hydroxypropyltrimethylammonium chloride is 2wt% to 4wt%; and / or, in the treatment solution, the concentration of the sodium hydroxide is 10 to 15 g / L; And / or, in the treatment solution, the concentration of calcium chloride is 0.1 to 1.5 g / L.

3. The preparation method according to claim 1, characterized in that: In step S1, the blending ratio of the seaweed fiber to the lyocell fiber is 15-25:75-85; And / or, in step S1, the cleaning and combing process includes: opening, blending and combing the spinning raw materials in sequence at a temperature of 20-25°C and a humidity of 55%-65%, the opening roller speed during the opening is 270-290r / min, the cotton feeding cord speed is 2.3-2.5m / min, the stripping roller speed is 180-200r / min, and the opening ratio is 360-380 times; the oblique nail cord speed during the blending is 22-25m / min, the stripping roller speed is 88-100r / min, and the small opening roller speed is 20-350r / min. The speed is 370-400r / min, the distance between the corner nail curtain and the cotton roller is 58-62mm, and the distance between the corner nail curtain and the cotton pressing curtain is 68-72mm; the flat plate speed during the combing is 190-210mm / min, the cylinder speed is 450-500r / min, the cylinder licker-in roller speed ratio is 1.9-2.1:1, the cylinder and the flat plate distance is 0.20-0.25mm, the cylinder and the licker-in roller distance is 0.17-0.19mm, the cylinder and the doffer distance is 0.14-0.16mm, and the total draft multiple is 55-65 times; And / or, in step S1, the drawing process includes: performing first-pass merging and second-pass merging at a temperature of 20-25°C and a humidity of 55%-65%, wherein the number of slivers in the first-pass merging is 6-8, the basis weight is 15-17g / 5m, the roller gauge is (8-10) mm×(18-20) mm, the total drafting multiple is (4-5)×(1.5-1.6) times, and the drafting multiple in the rear zone is 1.55-1.65 times; the number of slivers in the second-pass merging is 4-6, the basis weight is 15-17g / 5m, the roller gauge is (8-10) mm×(18-20) mm, the total drafting multiple is (4-5)×(1.2-1.4) times, and the drafting multiple in the rear zone is 1.2-1.3 times; And / or, in step S1, the spinning process includes: spinning at a temperature of 20-25°C and a humidity of 65%-75%, the basis weight of the spinning is 1.9-2.0g / 10m, the front roller speed is 200r / min, the roller gauge is (18-20)mm×(28-31)mm, the total drafting multiple is 7-9 times, the rear zone drafting multiple is 1.12-1.28 times, and the twist coefficient is 320-360.

4. The preparation method according to claim 1, characterized in that: In step S2, the mass ratio of the treatment liquid to the blended yarn is 1 to 5:100; And / or, in step S2, the bath ratio of the oscillation treatment is 1:10-30; And / or, in step S2, the temperature of the oscillation treatment is 30 to 60° C., and the time of the oscillation treatment is 10 to 30 minutes; And / or, in step S2, the washing temperature is 25-35° C., and the washing time is 5-10 min.

5. The preparation method according to claim 1, characterized in that: In step S3, the dye includes at least one of a reactive dye, a direct dye, an acid dye and a natural dye; and / or, in step S3, the mass ratio of the dye to the modified blended yarn is 1 to 4:100; And / or, in step S3, the bath ratio of the dyeing treatment is 1:10-30; And / or, in step S3, the insulation temperature is 75-85° C., and the dyeing treatment time is 30-40 minutes.

6. The preparation method according to claim 1, characterized in that: In step S4, the concentration of the cationic color fixing agent in the aqueous solution is 1 to 3 g / L; And / or, in step S4, the bath ratio of the color fixing treatment is 1:10-30; And / or, in step S4, the temperature of the color fixing treatment is 40-80° C., and the time of the color fixing treatment is 10-20 min; And / or, in step S4, the drying temperature is 40-80°C.

7. The preparation method according to claim 1, characterized in that: In step S4, the cleaning includes: placing the modified blended yarn after the color fixing treatment in a neutral detergent solution, shaking it, and then washing it.

8. The preparation method according to claim 7, characterized in that: The concentration of the neutral detergent solution is 5 to 10 g / L; And / or, the temperature of the oscillation treatment is 85-95° C., and the time of the oscillation treatment is 10-20 min; And / or, the washing temperature is 35-45° C., and the washing time is 5-15 min.

9. A blended yarn of algae fiber and lyocell fiber obtained by the preparation method according to any one of claims 1 to 8.

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