Processing technology of seaweed cotton blended yarn-dyed fabric

Abstract

The invention belongs to the technical field of textile dyeing and finishing, and particularly relates to a processing technology of a seaweed cotton blended yarn-dyed fabric, which comprises the following steps: atomizing and shaping seaweed cotton blended yarns, and spooling by a variable diameter method; the scouring and bleaching liquid is composed of a low-temperature scouring and bleaching agent, a gel protective agent, hydrogen peroxide, a hydrogen peroxide stabilizer and water, the loose bobbin is scoured and bleached through the scouring and bleaching liquid, and the hydrogen peroxide is added at the beginning of scouring and bleaching; preparing dye liquor from reactive dye, anhydrous sodium sulphate, a gel protective agent and water to dye the cheese; the dyed cheese is slashed and woven, and the seaweed cotton yarn-dyed fabric is obtained through singeing, desizing, sizing and preshrinking. The problems that due to the fact that the seaweed cotton blended yarn is large in shrinkage rate and high in hygroscopicity, the bobbin density becomes tight, the processed bobbin cannot be dried, and the layer difference is large are solved, it is avoided that seaweed fibers are dissolved and gelatinized under the action of salt and alkali, and it is prevented that seaweed falls to form viscous substances to be attached to the surface of the yarn; the content loss of the alginate fibers in dyeing and finishing processing is reduced, and the fabric strength is reduced.

Description

Technical Field

[0001] The invention relates to a processing technology of seaweed-cotton blended yarn-dyed fabric, belonging to the technical field of textile dyeing and finishing. Background Art

[0002] Seaweed fiber is a biomass functional fiber with abundant raw material sources, pure white appearance, soft feel, and is non-toxic, naturally antibacterial, moisture-absorbing, breathable, and biodegradable. It is a functional fiber material with high added value. However, it is currently difficult to achieve pure spinning of seaweed fiber yarn. Blending seaweed fiber with cotton is highly feasible in terms of technology, environment, and society, and the product is in line with the trend of circular economy.

[0003] Seaweed fiber's molecular structure contains numerous hydrophilic groups, such as hydroxyl groups, and boasts a large number of amorphous regions, resulting in excellent hygroscopicity. Cotton fiber, on the other hand, contains numerous hydroxyl groups in its molecular chain, resulting in a crystallinity of approximately 60-70%. The widespread distribution of amorphous regions creates natural moisture-absorbing pathways, resulting in excellent hygroscopicity for yarns blended with seaweed and cotton fibers. However, during dyeing and finishing, seaweed-cotton blended yarns are prone to significant shrinkage under wet and hot conditions. This is particularly true during the cheese processing phase of yarn-dyed weaving. The cheese absorbs very high water content in a water bath, and its density gradually increases over time, leading to uneven dyeing and insufficient drying in subsequent processing steps. Furthermore, the glycosidic bonds in seaweed fiber are unstable, making it susceptible to thermal decomposition under wet and hot conditions, alkaline and acidic conditions, and high temperatures, resulting in seaweed loss.

[0004] The large number of carboxyl groups in the molecular structure of seaweed fiber are easily ionized in aqueous solution, making the fiber negatively charged and repelling anionic reactive dyes. The dye is easily adsorbed by the seaweed fiber on the surface and exists as floating color, resulting in low dye uptake of seaweed fiber in conventional dyeing systems. In addition, seaweed fiber is prone to ion exchange under soda ash fixation conditions, which destroys the seaweed fiber structure, causing the seaweed to dissolve and adhere to the fiber surface, damaging the fiber, resulting in gelation, and dyeing problems such as poor dyeing and dyeing. Summary of the Invention

[0005]

Technical Issues

[0006] Seaweed fiber has a low dye uptake rate, resulting in high content loss and significant strength loss during dyeing and finishing. The cheese yarn has high hygroscopicity and shrinkage during wet heat treatment. This tightens the cheese density and causes yarn adhesion, further leading to problems such as uneven dyeing, poor dyeing, large layer differences, and difficulty drying the cheese. Therefore, large-scale production of seaweed fiber cheese yarn is difficult. A dyeing method for seaweed-cotton blended cheese yarn with excellent levelness and fastness is needed to improve the dimensional stability of the cheese yarn and the resulting fabric, reduce the loss of seaweed fiber content, and minimize strength loss.

[0007]

Technical solution

[0008] The first object of the present invention is to provide a processing technology for seaweed-cotton blended yarn-dyed fabric, comprising the steps of:

[0009] (1) Atomization shaping and variable diameter winding: The seaweed-cotton blended yarn is subjected to atomization shaping of the fiber structure and variable diameter loose winding to obtain a loose bobbin;

[0010] (2) Pretreatment and bleaching: The scouring liquid is composed of a low-temperature scouring agent, a gel protective agent, hydrogen peroxide, a hydrogen peroxide stabilizer and water. The loose yarn is scourged with the scouring liquid, wherein hydrogen peroxide is added at the beginning of the scouring. After the scouring is completed, the yarn is washed with hot water to obtain bleached yarn.

[0011] (3) Dyeing: Prepare dyeing solution with reactive dye, sodium sulfate, gel protective agent and water, dye the bleached cheese yarn, wash, soap, wash, dehydrate and dry to obtain dyed cheese yarn;

[0012] (4) Weaving and finishing: The dyed cheese yarn is sized and woven to obtain seaweed cotton grey cloth, which is then singed, desized, shaped and pre-shrinked to obtain seaweed cotton yarn-dyed fabric.

[0013] In one embodiment of the present invention, in step (1), the composition of the seaweed-cotton blended yarn is, by mass, 20-45% seaweed fiber and 55-80% cotton fiber; the fineness of the seaweed-cotton blended yarn is 30-60S.

[0014] The atomization shaping treatment can atomize water droplets into micron-sized particles, forming a gas-liquid mixed flow that penetrates the yarn tube, causing the seaweed fiber to undergo ionization reaction to build a self-crosslinking network, reducing the relative sliding between molecular chains, improving the dimensional stability of the yarn during wet treatment, and avoiding the shrinkage density of the yarn during the subsequent water bath treatment.

[0015] The atomization shaping process is carried out by a high temperature and high pressure atomizer.

[0016] In one embodiment of the present invention, in step (1), the temperature of the atomization shaping treatment is 95-105° C.; the humidity is 95-100%; and the treatment time is 40-50 minutes.

[0017] The steps of the variable diameter loose winding method are as follows: winding the seaweed-cotton blended yarn onto a large winding tube, and then changing the diameter to wind it onto a loose barrel shell to obtain a loose bobbin; when winding it onto the large winding tube, it is necessary to ensure that there is a certain gap between the inner and outer layers of yarn; and the yarn is wound onto the loose barrel shell by transferring the variable diameter barrel shell through an automatic variable diameter machine.

[0018] In one embodiment of the present invention, the diameter of the winding tube is 10.5 to 12.5 cm, and the length is 16 to 20 cm.

[0019] In one embodiment of the present invention, the diameter of the loose cylindrical shell is 6 to 7 cm; the length is 16 to 18 cm.

[0020] In one embodiment of the present invention, the parameters for winding the seaweed cotton blended yarn into the winding tube are: a winding speed of 650 to 750 m / min; a winding density of the winding tube of 0.35 to 0.38 g / cm 3 .

[0021] In one embodiment of the present invention, the winding density of the loose bobbin is 0.2 to 0.3 g / cm 3 .

[0022] In one embodiment of the present invention, in step (2), the bath ratio of the scouring treatment (the mass ratio of yarn to scouring liquid) is 1:9 to 1:15; the concentration of the low-temperature scouring agent in the scouring liquid is 0.5 to 1 g / L; the concentration of the gel protective agent is 2 to 4 g / L; the concentration of the hydrogen peroxide stabilizer is 0.1 to 0.5 g / L; and the concentration of the hydrogen peroxide is 6 to 10 g / L.

[0023] Low-temperature scouring agents are commercially available scouring agents that can scour cellulose fibers at 70 to 90°C.

[0024] Gel protective agents are commercially available additives that form a protective film on the surface of seaweed fibers. This can, to a certain extent, block the high-velocity, high-shear circulating water, alkali agents, and salts from direct contact with the fibers during dyeing and finishing processes, preventing swelling damage to the seaweed fibers and preventing fiber breakage and strength loss due to gelation. Its main ingredients are a combination of polysaccharide derivatives and silicones with alkali agents.

[0025] In one embodiment of the present invention, in step (2), the scouring step comprises scouring the yarn with a treatment solution consisting of a low-temperature scouring agent, a gel protective agent, a hydrogen peroxide stabilizer, and water, adding a hydrogen peroxide solution within 5 to 10 minutes of the start of scouring, then heating the yarn to 70 to 80° C. and maintaining the temperature for 50 to 80 minutes at a heating rate of 1.5 to 2° C. / min. The hydrogen peroxide solution is added to the treatment solution to prepare a scouring solution.

[0026] In one embodiment of the present invention, in step (2), the scouring step is to adjust the frequency to 85-90% and scour the yarn with a treatment solution prepared with a low-temperature scouring agent, a gel protective agent, a hydrogen peroxide stabilizer and water, add the hydrogen peroxide solution within 5-10 minutes after the start of scouring, and then increase the frequency to 90-100%, and follow the main pump circulation process of forward rotation for 4-6 minutes and then reverse rotation for 3-5 minutes, raise the temperature to 70-80°C and keep warm for 50-80 minutes; the heating rate is 1.5-2°C / min.

[0027] In one embodiment of the present invention, in step (2), the hydrogen peroxide solution is added at a rate that is first slow and then fast.

[0028] In one embodiment of the present invention, in step (2), the hot water washing temperature is 65-75°C and the hot water washing time is 8-12 minutes. During the hot water washing, the yarn removed from the scouring and bleaching solution should be placed in hot water for washing, rather than placing the yarn in cold water and then washing it in heated water.

[0029] In one embodiment of the present invention, in step (3), the bath ratio of dyeing is 1:9 to 1:15; the amount of dye is 0.1 to 4% owf; the concentration of sodium sulfate in the dye solution is 8 to 30 g / L; and the concentration of the gel protective agent in the dye solution is 5 to 10 g / L.

[0030] In one embodiment of the present invention, in step (3), the dyeing heating rate is 1.3-1.7° C. / min; the dyeing temperature is 60-70° C., and the dyeing holding time is 55-70 min.

[0031] In one embodiment of the present invention, in step (3), the dyeing step is to immerse the bleached cheese yarn in the dye solution, change the frequency by 90-100%, perform the main pump circulation by forward rotation for 4-6 minutes and then reverse rotation for 3-5 minutes, and heat the temperature to 60-70°C at a heating rate of 1.3-1.7°C / min and keep the temperature for 55-70 minutes.

[0032] In one embodiment of the present invention, in step (3), after dyeing, the mixture is washed with water at 15-30° C. for 6-10 minutes, heated to 90-98° C. for soap washing for 7-12 minutes, and then washed with water at 15-30° C. for 6-10 minutes; and the washing and soap washing are performed under the condition of variable frequency of 80-90%.

[0033] In one embodiment of the present invention, in step (3), color fixing and softening finishing are performed before dehydration.

[0034] In one embodiment of the present invention, in step (3), the dehydration treatment is performed 1 to 2 times; the drying temperature is 100 to 120° C., and the drying time is 3.5 to 6 hours.

[0035] In one embodiment of the present invention, in step (3), the reactive dye is a reactive dye having a double reactive group.

[0036] In one embodiment of the present invention, in step (4), the desizing is performed by enzyme desizing. When removing the size from the grey cloth, a mild enzyme desizing agent is selected to prevent the desizing agent from degrading the seaweed fiber.

[0037] In one embodiment of the present invention, in step (4), the desizing step comprises: using a desizing solution consisting of a high-temperature desizing enzyme, a penetrant and water to pad the grey cloth, piling it and then washing it with water; the enzyme activity of the high-temperature desizing enzyme is 4000-5000 U / mL; the concentration of the high-temperature desizing enzyme is 5-10 g / L; the amount of the penetrant is 0.8-1.2 g / L; the liquid carrying rate is 82-92%; the piling time is 20-30 min; the piling temperature is 80-90° C.; the washing temperature is 85-90° C.; and continuous water washing and desizing are adopted.

[0038] High-temperature desizing enzymes are commercially available desizing enzymes that can desizing starch slurries at 75-105°C.

[0039] In one embodiment of the present invention, in step (4), the setting temperature is 100-115°C; the setting tension is 0.05-0.2 MPa; and the pre-shrinkage rate is 2-5%. The low-temperature, low-tension setting process rarely causes loss of seaweed fiber content in the grey fabric. The setting and pre-shrinking process can improve the softness, strength, and wearability of the seaweed-cotton blended fabric.

[0040] In one embodiment of the present invention, in step (4), the speed of the desizing machine is 50-75 m / min; the speed of the shaping machine is 60-80 m / min; and the speed of the pre-shrinking machine is 60-80 m / min.

[0041] The second object of the present invention is to provide a seaweed-cotton blended yarn-dyed fabric produced by the above processing method.

[0042] The third object of the present invention is to provide the application of the seaweed-cotton blended yarn-dyed fabric in the field of textiles.

[0043] Beneficial effects:

[0044] (1) The processing method of the present invention realizes the industrial application of seaweed-cotton blended fibers in textiles, breaking through the technical bottleneck of seaweed fiber cheese yarn dyeing.

[0045] (2) The present invention solves the problem that the density of the bobbin becomes tight due to the large shrinkage rate and high hygroscopicity of the seaweed-cotton blended yarn, and the bobbin cannot be dried after treatment, resulting in large layer differences, through atomization shaping treatment and variable diameter loose winding technology.

[0046] (3) The scouring, dyeing and finishing process of the present invention has a low seaweed fiber loss rate, little damage to the fiber strength, and prevents yarn adhesion. The color fastness level of the dyed yarn reaches level 4, which solves the problems of large dyeing layer difference, dyeing spots and incomplete dyeing of seaweed-cotton blended cheese yarn. The operation is simple and easy to mass produce.

[0047] (4) The pretreatment and bleaching process of the present invention uses four auxiliary agents in a coordinated manner to obtain a semi-finished seaweed-cotton blended bleached cheese yarn with a certain whiteness and hair effect, and can reduce the loss of seaweed fiber content and prevent seaweed from falling and forming a sticky substance adhering to the yarn surface.

[0048] (5) In the reactive dyeing process, alkaline seaweed fiber gel protective agent is used instead of soda ash used for conventional dyeing, and low salt dyeing is used to improve the dyeing rate, so as to avoid the complete dissolution of seaweed fiber under the action of soda ash, and the ion exchange effect between seaweed fiber and other salt and alkali additives leading to fiber gelation, thereby solving the problem of low coloring rate of seaweed fiber and reducing the loss of seaweed fiber in dyeing and finishing.

[0049] (6) The seaweed-cotton blended fabric prepared by the present invention has the advantages of antibacterial properties, moisture absorption and breathability, soft hand feel, and biodegradability. The seaweed fiber content of the fabric is ≥7%, the dimensional change rate after washing is -3.0% to 0%, the tear strength is ≥8N, the tensile strength is ≥18kg, the color fastness to friction is ≥3.5, the color fastness to washing and perspiration is ≥4, and the color fastness to sunlight is ≥3. DETAILED DESCRIPTION

[0050] Test Method

[0051] Color difference: Turn a 0.5kg bobbin upside down on a bobbin winder to remove yarn. First, remove 5-7g of the outer yarn from the bobbin to obtain the outer layer. Turn the bobbin over until the yarn weight reaches approximately 350g, then remove 5-7g of the middle yarn. Continue turning the bobbin over until the yarn weight reaches approximately 200g, then remove 5-7g of the inner yarn. Continue turning the bobbin over until it reaches the shell, then remove 5-7g of the innermost yarn. The outer yarn of the bobbin is used as the standard sample, and the innermost, inner, and middle yarn layers are used as batch samples. The color of the innermost, inner, and middle layers of the bobbin is measured using a Datacolor 800 colorimeter. Each sample is measured four times, and the average value is taken.

[0052] Moisture content:

[0053] Moisture content = (net weight of cheese after treatment - weight of cheese before treatment * (1 - weight loss rate)) / (weight of cheese before treatment * (1 - weight loss rate)).

[0054] The weight loss rate is the weight loss of the cheese yarn caused by the loss of seaweed fiber content, yarn hairiness loss, etc. during the production process, which is generally 1% to 10%.

[0055] Color fastness: The color fastness to washing and rubbing of dyed cheese yarn and seaweed cotton blended yarn-dyed fabrics were tested in accordance with GB / T 3921-2008 "Textiles — Tests for color fastness — Color fastness to washing with soap and soap" and GB / T 3920-2008 "Textiles — Tests for color fastness — Color fastness to rubbing". The color fastness to sunlight and perspiration of seaweed cotton blended yarn-dyed fabrics were tested in accordance with GB / T 8427-2019 "Textiles — Tests for color fastness to artificial light: Xenon arc fading lamp testing" and GB / T 3922-2013 "Textiles — Test method for color fastness to perspiration".

[0056] Mechanical properties: The breaking strength of dyed cheese yarn was tested in accordance with GB / T 3923.1-2013 “Tensile properties of textiles — Part 1: Determination of breaking force and elongation at break (Strip method)”. The tearing strength and tensile strength of seaweed-cotton blended yarn-dyed fabrics were tested in accordance with GB / T 3917.2-2008 “Tear properties of textiles — Part 2: Tear strength of trouser-shaped specimens (single seam)” and GB / T 3923.1-2013 “Tensile properties of textiles — Part 1: Determination of breaking force and elongation at break (Strip method)”.

[0057] Fabric dimensional change rate: The dimensional change rate of seaweed cotton blended yarn-dyed fabric is tested in accordance with GB / T 8628-2013 "Textiles - Preparation, marking and measurement of fabric specimens and garments in tests for the determination of dimensional change".

[0058] Seaweed fiber content: The seaweed fiber content of seaweed-cotton blended yarn-dyed fabrics was tested in accordance with GB / T 35443-2024 “Textiles - Quantitative chemical analysis of mixtures of seaweed fibers and certain other fibers”.

[0059] Example 1

[0060] A seaweed-cotton blended yarn-dyed fabric, with specifications of: 40S cotton 60% seaweed 40%*40S cotton 60% seaweed 40%*120 strands / inch*90 strands / inch, plain weave, and an effective width of 56 inches. The preparation method comprises the following steps:

[0061] Pretreatment (atomization and shaping treatment) → variable diameter loose winding → cheese pretreatment bleaching → dyeing → warping → sizing → weaving → singeing → desizing → shaping → pre-shrinking

[0062] (1) Atomization shaping treatment: The seaweed-cotton blended yarn was atomized in a high-temperature and high-pressure atomizer at a humidity of 98% and 95°C for 45 minutes.

[0063] (2) Variable diameter loose winding: The seaweed cotton blended yarn bobbin after atomization shaping treatment is first wound onto a large winding tube with a diameter of 11 and a length of 17.5 cm at a winding speed of 700 m / min. The winding density is controlled at 0.36 g / cm3 Then put it into the automatic diameter reducing machine of the equipment, press the start button, and the diameter reducing machine automatically works to transfer the diameter reducing shell, and finally changes the diameter to a loose shell with a diameter of 6.5*length of 17cm, and the winding density of the bobbin is 0.25g / cm 3 Loose bobbin.

[0064] (3) Pretreatment and bleaching: The formula of the scouring liquid is: low-temperature scouring agent TF-179 0.5g / L, gel protective agent OMW-6 3g / L, hydrogen peroxide 8g / L, hydrogen peroxide stabilizer Transtex PRE 122 0.2g / L, and the bath ratio is 1:9. Adjust the frequency conversion to 90%, first dissolve the scouring agent (low-temperature scouring agent, gel protective agent OMW-6, hydrogen peroxide stabilizer Transtex PRE) in the auxiliary tank, and then pump the material from the auxiliary tank to the main tank containing yarn and water. The auxiliary tank dissolves the hydrogen peroxide solution, and then pumps the hydrogen peroxide solution into the main tank at a speed that is first slow and then accelerated. After adding hydrogen peroxide for 7 minutes, the material is pumped out. Set the frequency conversion to 100%, and follow the main pump circulation process of forward rotation for 5 minutes and reverse rotation for 4 minutes. Heat the temperature to 75℃ at a heating rate of 1.8℃ / min, keep warm for 60 minutes, and discharge the scouring liquid. After the cheese yarn leaves the cylinder, the water temperature of the dyeing machine is raised to 70°C and the yarn is put into the dyeing machine. The yarn is washed with water at 100% constant frequency in forward rotation for 10 minutes, washed twice, and the frequency setting of the dyeing machine is adjusted to 75%. The yarn is then subjected to conventional pickling treatment with glacial acetic acid aqueous solution and conventional deoxygenation treatment with deoxygenase to obtain bleached cheese yarn.

[0065] (4) Dyeing: Prepare dye solution with the formula of RGB golden yellow 0.3% owf, RGB dark red 0.7% owf, RGB blue 0.03% owf, sodium sulfate 10g / L, and gel protective agent OMW-6 5g / L. Put the dye solution and bleached cheese yarn into the dyeing machine according to the bath ratio of 1:9, set the frequency conversion to 100%, set the main pump circulation process of forward rotation for 5 minutes and then reverse rotation for 4 minutes, heat it to 60℃ (heating rate 1.5℃ / min), and keep it warm for 60 minutes. Set the frequency conversion of the dyeing machine to 85%, wash it with overflow water at room temperature (25℃) for 7 minutes, then heat it to 95℃ and wash it with soap for 7 minutes. After washing with water at room temperature for 7 minutes and conventional color fixing and softening treatment, take it out of the cylinder and dehydrate it twice. Use a high-exhaust dryer at 110℃ to dry it for 4.5 hours to obtain dyed cheese yarn.

[0066] (5) Weaving and finishing: The dyed cheese yarn is sized and woven to obtain seaweed cotton grey fabric, which is then singed, desized, shaped, and pre-shrinked to obtain seaweed cotton yarn-dyed fabric;

[0067] The desizing solution formula is as follows: 7g / L high-temperature desizing enzyme 3H, 1g / L penetrant GL-105; the grey cloth is padded with the desizing solution, piled, and then washed with water, with a liquid pick-up rate of 90%; the pile temperature is 80°C, the pile time is 30 minutes, the washing temperature is 90°C, and the vehicle speed is 70m / min; the enzyme activity of the high-temperature desizing enzyme is 4000U / mL;

[0068] The shaping conditions are: speed 70m / min, temperature 110℃, working fluid: softener 15g / L, rolling rate 56%~60%, shaping width 148~149cm, shaping tension 0.1Mpa;

[0069] The pre-shrinkage conditions are: machine speed 70m / min, cloth shrinkage rate 3%, cloth weft density 89-90 threads / inch, and width 145-147cm.

[0070] Among them, low-temperature scouring agent TF-179 and hydrogen peroxide stabilizer Transtex PRE 1220A are produced by Zhejiang Chuanhua Chemical Group; gel protective agent OMW-6 is produced by Qingdao Ocean Element Biotechnology Co., Ltd., high-temperature desizing enzyme 3H is produced by Nantong Xinhe Chemical Co., Ltd., and penetrant GL-105 is produced by Nantong Risheng Dyeing and Chemical Auxiliary Co., Ltd.

[0071] Example 2

[0072] A seaweed-cotton blended yarn-dyed fabric, with specifications of: 50S cotton 80% seaweed 20%*50S cotton 80% seaweed 20%*145 strands / inch*90 strands / inch, 2 / 1 twill, and an effective width of 56 inches. The preparation method comprises the following steps:

[0073] Pretreatment (atomization and shaping treatment) → variable diameter loose winding → cheese pretreatment bleaching → dyeing → warping → sizing → weaving → singeing → desizing → shaping → pre-shrinking

[0074] (1) Atomization shaping treatment: The seaweed-cotton blended yarn was atomized in a high-temperature and high-pressure atomizer at a humidity of 98% and 95°C for 45 minutes.

[0075] (2) Variable diameter loose winding: The seaweed cotton blended yarn bobbin after atomization shaping treatment is first wound onto a large winding tube with a size of 11*17.5cm at a winding speed of 700m / min. The winding density is controlled at 0.36g / cm 3 Then put it into the automatic diameter reducing machine of the equipment, press the start button, and the diameter reducing machine automatically works to transfer the diameter reducing shell, and finally reduces the diameter to a loose shell with a size of 6.5*17cm, and the winding density of the bobbin is 0.26g / cm 3 Loose bobbin.

[0076] (3) Pretreatment and Bleaching: The scouring solution formula is: low-temperature scouring agent TF-179 1g / L, gel protective agent OMW-6 4g / L, hydrogen peroxide 10g / L, hydrogen peroxide stabilizer Transtex PRE 122 0.5g / L, with a bath ratio of 1:15. Adjust the frequency conversion to 90%, first dissolve the scouring agent in the auxiliary tank, and then pump the material from the auxiliary tank into the main tank containing yarn and water. The auxiliary tank is heated to a temperature of 5°C, and then the hydrogen peroxide solution is pumped into the main tank at a speed that is first slow and then accelerated. The hydrogen peroxide is added after 7 minutes and the pumping is completed. The frequency conversion is set to 100%, and the main pump is circulated in a process of forward rotation for 5 minutes and then reverse rotation for 4 minutes. The temperature is raised to 75°C at a heating rate of 1.8°C / min and kept warm for 60 minutes. The scouring liquid is discharged, and the cheese yarn is taken out of the tank. The water in the dyeing machine is heated to 70°C and the yarn is then put into the dyeing machine. The yarn is washed with water at a constant frequency of 100% in the forward direction for 10 minutes. After washing twice, the frequency conversion setting of the dyeing machine is adjusted to 75%, and acid washing and deoxidation treatment are performed to obtain bleached cheese yarn.

[0077] (4) Dyeing: Prepare dye liquor, the formula of which is: RGB golden yellow 0.12% owf, RGB dark red 0.09% owf, RGB blue 0.29% owf, sodium sulfate 28g / L, gel protective agent OMW-6 8g / L; put the dye liquor and bleached cheese yarn into the dyeing machine according to the bath ratio of 1:15, set the frequency conversion to 100%, set the main pump circulation process of forward rotation for 5 minutes and then reverse rotation for 4 minutes, heat it to 60℃ (heating rate 1.5℃ / min), and keep it warm for 60 minutes; set the frequency conversion of the dyeing machine to 85%, wash it with overflow water at room temperature (25℃) for 7 minutes, then heat it to 95℃ and wash it with soap for 10 minutes, wash it with water at room temperature for 7 minutes, and then do conventional color fixing and softening treatment, then take it out of the cylinder and dehydrate it twice, and use a high-exhaust dryer at 110℃ to dry it for 4.5 hours to obtain the dyed cheese yarn;

[0078] (5) Weaving and finishing: The dyed cheese yarn is sized and woven to obtain seaweed cotton grey fabric, which is then singed, desized, shaped, and pre-shrinked to obtain seaweed cotton yarn-dyed fabric;

[0079] The desizing solution formula is as follows: 7g / L high-temperature desizing enzyme 3H, 1g / L penetrant GL-105; the grey cloth is padded with the desizing solution, piled, and then washed with water, with a liquid pick-up rate of 85%; the pile temperature is 80°C, the pile time is 30 minutes, the washing temperature is 90°C, and the vehicle speed is 60m / min; the enzyme activity of the high-temperature desizing enzyme is 4000U / mL;

[0080] The shaping conditions are: speed 70m / min, temperature 110℃, working fluid: softener 15g / L, rolling rate 56%~60%, shaping width 148~149cm, shaping tension 0.1Mpa;

[0081] The pre-shrinkage conditions are: machine speed 70m / min, cloth shrinkage rate 2.5%, cloth weft density 89-90 threads / inch, and width 145-147cm.

[0082] Comparative Example 1

[0083] A seaweed-cotton blended yarn, specification: 50S cotton 80% seaweed 20%. The preparation method comprises the following steps:

[0084] Winding → cheese pre-treatment bleaching → dyeing → warping → sizing → weaving → singeing → desizing → shaping → pre-shrinking

[0085] (1) Winding: Winding at a speed of 700 m / min, the bobbin winding density is 0.38 g / cm 3 of loose bobbins;

[0086] (2) Pretreatment and Bleaching: Prepare a scouring solution with the following formula: 1 g / L low-temperature scouring agent TF-179, 4 g / L gel protective agent OMW-6, 10 g / L hydrogen peroxide, and 0.5 g / L hydrogen peroxide stabilizer Transtex PRE 122, with a bath ratio of 1:7. Adjust the frequency conversion to 90%. First, add the scouring agent to the auxiliary tank, and then pump the material from the auxiliary tank into the main tank containing yarn and water. The auxiliary tank is heated to a temperature of 1.5°C / min and then the hydrogen peroxide solution is pumped into the main tank at a speed that is first slow and then accelerated. The hydrogen peroxide is added after 7 minutes and the pumping is finished. The frequency conversion is set to 100%, and the temperature is raised to 75°C at a rate of 1.8°C / min in a positive cycle constant frequency conversion. The temperature is kept at this temperature for 60 minutes, and the scouring liquid is discharged. The dyeing machine is directly fed with water and the temperature is raised to 70°C. The dyeing machine is washed with water at a constant frequency conversion of 100% in a positive cycle for 10 minutes. The yarn is washed twice and then acid-washed and deoxidized at a frequency conversion of 100% to obtain bleached cheese yarn.

[0087] (3) Dyeing: Prepare dye solution with the formula of RGB golden yellow 0.12% owf, RGB dark red 0.09% owf, RGB blue 0.29% owf, sodium sulfate 28g / L, and gel protective agent OMW-6 8g / L. Put the dye solution and bleached cheese yarn into the dyeing machine according to the bath ratio of 1:7, set the frequency conversion to 100%, and heat it to 60℃ (heating rate 1.5℃ / min) according to the conventional positive cycle constant frequency conversion, and keep it warm for 60min. Set the frequency conversion of the dyeing machine to 85%, wash it with overflow water at room temperature (25℃) for 7min, then heat it to 95℃ and wash it with soap for 10min. After washing with water at room temperature for 7min and conventional color fixing and softening treatment, take it out of the cylinder for dehydration once, and use a high-exhaust dryer at 110℃ to dry it for 4.5h to obtain dyed cheese yarn.

[0088] (4) Weaving and finishing: The dyed cheese yarn is sized and woven to obtain seaweed cotton grey cloth, which is then subjected to conventional singeing, desizing, shaping, and pre-shrinking processes to obtain seaweed cotton yarn-dyed fabric.

[0089] Comparative Example 2

[0090] A seaweed-cotton blended yarn-dyed fabric, specifications: 40S cotton 60% seaweed 40%*40S cotton 60% seaweed 40%*120 roots / inch*90 roots / inch, plain weave, finished product effective width 56 inches.

[0091] The preparation method is different from that of Example 1 only in that step (5) is: sizing the dyed cheese yarn to obtain seaweed cotton grey cloth, and then singeing, desizing, shaping, and pre-shrinking to obtain seaweed cotton yarn-dyed fabric;

[0092] The desizing solution formula is as follows: 7g / L wide-temperature desizing enzyme, 1g / L penetrant GL-105; the greige fabric is padded with the desizing solution, piled, and then washed with water, with a liquid pick-up rate of 85%; the pile temperature is 101°C, the pile time is 30 minutes, the washing temperature is 90°C, and the vehicle speed is 60m / min; the enzyme activity of the wide-temperature desizing enzyme is 2000U / mL;

[0093] The shaping conditions are: speed 70m / min, temperature 170℃, working fluid: softener 15g / L, rolling rate 56%~60%, shaping width 148~149cm, shaping tension 0.4Mpa;

[0094] The pre-shrinkage conditions are: machine speed 70m / min, cloth shrinkage rate 3%, cloth weft density 89-90 threads / inch, and width 145-147cm.

[0095] The performance test of the dyed cheese yarn prepared in Examples 1, 2 and Comparative Example 1 is shown in Tables 1 to 3, and the performance test of the seaweed-cotton blended yarn-dyed fabric prepared in Examples 1, 2 and Comparative Example 2 is shown in Table 4.

[0096] Table 1 Color difference test results of dyed cheese yarn

[0097]

[0098] As shown in Table 1, the dyed cheese yarns produced in Examples 1 and 2 exhibited minimal color variation across layers, exhibited uniform dyeing, and exhibited no yarn adhesion. The cheese yarns produced in Comparative Example 1 exhibited dyeing only on the outer and innermost layers, with the remainder being white or a very light blue. The dyeing was neither thorough nor uniform, exhibited significant layer variation, and exhibited significant yarn adhesion, resulting in yarn breakage and impeding subsequent warping and sizing processes.

[0099] Table 2 Moisture content of dyed cheese yarn

[0100]

[0101] As shown in Table 2, the moisture content of Examples 1 and 2 is at the level of dry yarn moisture, and the difference in moisture content between the inner and outer layers is not significant. The yarn of Comparative Example 1 is clearly damp, and the difference in moisture content between the inner and outer layers is large. Damp yarns can make subsequent processing difficult and can also cause quality problems such as discoloration, mold, and easy breakage.

[0102] Table 3 Color fastness and breaking strength of dyed cheese yarn

[0103]

[0104] As shown in Table 3, the color fastness and breaking strength of the dyed yarns produced in Examples 1 and 2 were superior to those in Comparative Example 1. Seaweed fiber has high hygroscopicity and shrinkage. Comparative Example 1, which was not pretreated and had a conventional winding density, experienced a tighter package density after pretreatment and wet heat treatment during dyeing. The leaching of seaweed caused yarn adhesion, further resulting in dyeing problems such as uneven dyeing and incomplete dyeing, poor dye fixation, and poor color fastness.

[0105] Table 4 Fabric properties

[0106]

[0107] As shown in Table 4, Example 1 and Comparative Example 2 used the same 40% seaweed fiber raw material ratio. Comparative Example 2 employed a wide-temperature desizing enzyme and a high-temperature, high-tension setting method, resulting in more stable weft dimensions. However, the resulting seaweed-cotton blended yarn-dyed fabric exhibited a significant loss of seaweed fiber content, reaching 55.2%. The resulting tear strength was significantly lower, and the warp tensile strength decreased significantly. Examples 1 and 2 employed a high-temperature desizing enzyme and a low-temperature, low-tension setting method, resulting in only 17.8% and 20.5% seaweed fiber content losses in the seaweed-cotton blended yarn-dyed fabric, respectively, with improved tear strength and tensile strength.

[0108] The embodiments provided above are not intended to limit the scope of the present invention, nor are the steps described to limit their execution order. Any obvious improvements to the present invention made by those skilled in the art in combination with existing common knowledge shall fall within the scope of protection defined by the claims of the present invention.

Claims

1. A processing technology for seaweed-cotton blended yarn-dyed fabric, characterized in that: Including steps: (1) Atomization shaping and variable diameter winding: The seaweed-cotton blended yarn is subjected to atomization shaping of the fiber structure and variable diameter loose winding to obtain a loose bobbin; (2) Pretreatment and bleaching: The scouring liquid is composed of a low-temperature scouring agent, a gel protective agent, hydrogen peroxide, a hydrogen peroxide stabilizer and water. The loose yarn is scourged with the scouring liquid, wherein hydrogen peroxide is added at the beginning of the scouring. After the scouring is completed, the yarn is washed with hot water to obtain bleached yarn. (3) Dyeing: Prepare dyeing solution with reactive dye, sodium sulfate, gel protective agent and water, dye the bleached cheese yarn, wash, soap, wash, dehydrate and dry to obtain dyed cheese yarn; (4) Weaving and finishing: The dyed cheese yarn is sized and woven to obtain seaweed cotton grey cloth, which is then singed, desized, shaped and pre-shrinked to obtain seaweed cotton yarn-dyed fabric.

2. The processing technology according to claim 1, characterized in that: In step (1), the composition of the seaweed-cotton blended yarn is, by mass, 20-45% seaweed fiber and 55-80% cotton fiber; the fineness of the seaweed-cotton blended yarn is 30-60S; the temperature of the atomization shaping treatment is 95-105°C; the humidity is 95-100%; and the treatment time is 40-50 minutes.

3. The processing technology according to claim 1, characterized in that: In step (1), the step of the variable diameter loose winding method is to wind the seaweed cotton blended yarn onto the winding tube, and then change the diameter and wind it onto the loose tube shell to obtain a loose bobbin; the parameters of winding onto the winding tube are: a winding speed of 650 to 750 m / min; a winding density of the winding tube of 0.35 to 0.38 g / cm 3 The winding density of loose bobbins is 0.2-0.3 g / cm 3 .

4. The processing technology according to claim 1, characterized in that: In step (2), the bath ratio of the scouring treatment is 1:9 to 1:15; the concentration of the low-temperature scouring agent in the scouring liquid is 0.5 to 1 g / L; the concentration of the gel protective agent is 2 to 4 g / L; the concentration of the hydrogen peroxide stabilizer is 0.1 to 0.5 g / L; and the concentration of the hydrogen peroxide is 6 to 10 g / L.

5. The processing technology according to claim 1, characterized in that: In step (2), the scouring step is to scour the yarn with a treatment solution composed of a low-temperature scouring agent, a gel protective agent, a hydrogen peroxide stabilizer and water, add a hydrogen peroxide solution within 5 to 10 minutes of the start of scouring, and then heat it to 70 to 80°C and keep it warm for 50 to 80 minutes; the heating rate is 1.5 to 2°C / min; the temperature of hot water washing is 65 to 75°C, and the time of hot water washing is 8 to 12 minutes.

6. The processing technology according to claim 1, characterized in that: In step (3), the bath ratio of dyeing is 1:9 to 1:15; the amount of dye used is 0.1 to 4% owf; the concentration of sodium sulfate in the dyeing solution is 8 to 30 g / L; the concentration of the gel protective agent in the dyeing solution is 5 to 10 g / L; the dyeing temperature is 60 to 70° C., and the dyeing holding time is 55 to 70 minutes; and the reactive dye is a reactive dye with a double reactive group.

7. The processing technology according to claim 1, characterized in that: In step (4), the desizing step comprises: padding the grey cloth with a desizing solution consisting of a high-temperature desizing enzyme, a penetrant and water, piling the grey cloth and then washing the same; the enzyme activity of the high-temperature desizing enzyme is 4000-5000 U / mL; the concentration of the high-temperature desizing enzyme is 5-10 g / L; the amount of the penetrant is 0.8-1.2 g / L; the liquid carrying rate is 82-92%; the piling time is 20-30 min; the piling temperature is 80-90° C.; and the washing temperature is 85-90° C.

8. The processing technology according to claim 1, characterized in that: In step (4), the shaping temperature is 100-115° C.; the shaping tension is 0.05-0.2 MPa; and the pre-shrinkage rate is 2-5%.

9. Seaweed-cotton blended yarn-dyed fabric produced by the processing technology of claims 1 to 8.

10. Use of the seaweed-cotton blended yarn-dyed fabric according to claim 9 in the field of textiles.

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