CN115679718B - Method for dyeing cotton yarn by indigo non-reduction dyeing method - Google Patents
Method for dyeing cotton yarn by indigo non-reduction dyeing method Download PDFInfo
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Abstract
The invention relates to a method for dyeing cotton yarn by an indigo non-reduction dyeing method, which comprises the steps of firstly preparing mixed solution of indigo dye, a dispersing agent and peregal O, carrying out superfine micronization treatment on the prepared mixed solution to obtain superfine indigo dye solution, carrying out high Wen Jinran and fixation treatment on the cotton yarn by adopting the superfine indigo dye solution, and slightly sizing the cotton yarn subjected to fixation treatment by adopting a high polymer as an adhesive to obtain indigo cotton yarn; the particle size of the indigo particles in the superfine indigo dye liquor is nano-scale; the high-temperature dip dyeing temperature is 75-85 ℃; slight sizing means that the sizing rate of the indigo cotton yarn is 3.5-5.5%; the particle size of the indigo particles in the superfine indigo dye liquor is 100-600 nm. The invention does not relate to a series of reducing agents such as sodium hydrosulfite, greatly reduces the toxicity of dye liquor wastewater, has less energy consumption and has the characteristic of green environmental protection.
Description
Technical Field
The invention belongs to the technical field of textile technology and vat dye dyeing, and relates to a method for dyeing cotton yarn by an indigo non-vat dyeing method.
Background
Indigo dye is one of the earliest natural dyes used by humans, indigo is a vat dye, belongs to the family of indics, and plant indigo has a long history throughout the world, and is widely used in food processing, printing and dyeing industries, painting and cosmetic coloring, and the like. The blue grass is an important dye source in China from ancient times, and through production practice, the extraction and dyeing technology of the indigo dye is gradually perfected and becomes an independent hand industry.
Indigo dye is used as a vat dye, and the dyeing of fabrics is generally divided into the following four steps: (1) reduction of dye: firstly, the dye needs to be reduced into leuco bodies by strong reducing agents such as sodium dithionite and the like under alkaline medium. (2) staining of leuco: leuco bodies have a greater affinity for cellulose and thus can be used to dye cotton fabrics quickly. (3) oxidation of leuco: after dyeing the fiber with the vat dye leuco, the leuco needs to be oxidized by air or other modes to be converted into insoluble dye to be fixed on the fabric, so that the color fastness is obtained. (4) oxidation post-treatment: the oxidized yarn or fabric can obtain ideal color fastness through proper post-treatment, the main process of the post-treatment is soaping, and the proper soaping can enable dye molecules to form aggregates and even form tiny crystals, so that the orientation of the dye molecules is changed, and the fabric obtains stable chromatic light.
Artificial indigo has rapidly replaced the plant indigo since the advent of artificial indigo dye at the end of the 19 th century, and denim-dyed apparel rapidly occupies the global market and is known as jean. The jean is favored by the masses of workers as the coarse cotton fabric, and the jean has a light weight in daily wearing due to the rough fabric style and simplicity without losing fashionable color matching. At present, the jean fabric is dyed by a sheet yarn type size dyeing combination machine at normal temperature, the process route is required to be dyed and oxidized for up to 10 times, most of reducing agents for vat dyes are sodium hydrosulfite, and the reduction potential of the reducing agents can reach-1137 mV at 0.5mol/L and is far greater than-760 mV required by indigo, so that almost any vat dye can be reduced. However, due to the unstable chemical property, the catalyst can rapidly react in air or water solution to generate sulfite and thiosulfate ions, and the ions have corrosiveness to make the COD of the printing and dyeing wastewater higher, so that the catalyst is a great difficulty in environmental protection production and recycling. In recent years, other reducing agents are also used for dyeing vat dyes, such as thiourea dioxide, which has the advantages of better chemical stability, and the oxidation in alkaline solution to generate sulfate and urea, which are basically harmless to the environment, but the price is high, so that the cost is increased, and the vat dye is not used on a large scale.
Therefore, it is of great importance to develop a method which can dye cotton yarn and achieve good effect without using reducing agent.
Disclosure of Invention
The invention aims to solve the problems of reduction and oxidation steps, environmental pollution caused by a reducing agent and the like of indigo dye dyeing in the prior art, and provides a method for dyeing cotton yarn by an indigo non-reduction dyeing method. The invention provides a method for dyeing cotton yarn by an indigo non-reduction dyeing method, which comprises the steps of preparing superfine indigo dye liquor, dyeing cotton yarn at high temperature, post-treating dyed cotton yarn and improving the color fastness of dyed yarn. The invention adopts a molecular cluster dyeing method, does not adopt the traditional step of reducing indigo dye into leuco body and then dyeing and oxidizing, omits the consumption of chemical agents such as sodium hydrosulfite, alkali and the like, reduces the harm of dye liquor wastewater, has the characteristics of cleanness and environmental protection, simplifies the dyeing steps, shortens the production period, effectively reduces the production cost and has the potential of sustainable development.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for dyeing cotton yarn by indigo non-reduction dyeing method comprises the steps of firstly preparing mixed solution of indigo dye, dispersant and peregal O, then carrying out superfine micronization treatment on the prepared mixed solution to obtain superfine indigo dye liquor (the superfine micronization treatment can adopt common grinding equipment, including a ceramic sand mill, a nano grinding machine and the like to carry out grinding treatment on the indigo dye liquor, the grinding treatment can effectively reduce the size of indigo particles to achieve micrometer or even nanometer scale, the specific surface area of the indigo dye liquor is enlarged, the penetration and the dye color improvement are facilitated, then carrying out high Wen Jinran and fixation treatment on the cotton yarn by adopting the superfine indigo dye liquor, and finally carrying out slight sizing on the cotton yarn subjected to the fixation treatment by adopting a high polymer as an adhesive to obtain the indigo cotton yarn;
the particle size of the indigo particles in the superfine indigo dye liquor is nano-scale;
the high-temperature dip dyeing temperature is 75-85 ℃;
slight sizing means that the sizing rate of the indigo cotton yarn is 3.5-5.5%.
The method for dyeing cotton yarn by indigo of the invention comprises the steps of dyeing by adopting a dip dyeing method, and not reducing indigo dye into leuco and oxidizing the leuco. In the dip dyeing process, the indigo particles reach the fiber surface and are adsorbed on the fiber surface, and as the particle size of the indigo particles reaches the nanometer level under the grinding effect, the pores of the cotton fiber are increased by high temperature, dye molecules are freely diffused into the fiber and are inlaid in the pores in the fiber, and along with the continuous dissolution and adsorption of the dye particles, the dye in the dispersing agent micelle is also released and supplemented into dye liquor for diffusion and adsorption again.
The sizing can reduce hairiness on the surface of the yarn and improve the wear resistance of the yarn, and the adhesive is used as the main sizing agent to improve the dry and wet friction color fastness of the colored yarn, so that the indigo dye is better fixed on the yarn and is not easy to fall off, thereby achieving the purpose of improving the color durability.
As a preferable technical scheme:
the method for dyeing cotton yarn by using the indigo non-reduction dyeing method comprises the steps of preparing mixed solution by using indigo dye, a dispersing agent and peregal O: preparing an indigo dye solution with a bath ratio of 1:10-30, and then adding a dispersing agent and peregal O into the indigo dye solution to obtain a mixed solution, wherein the dispersing agent and peregal O can be added simultaneously or sequentially, and the adding mode of the three substances is not particularly required.
According to the method for dyeing cotton yarn by the indigo non-reduction dyeing method, the addition amount of the dispersing agent is 2-5% of the mass of the indigo dye, and the addition amount of peregal O is 2-5% of the mass of the indigo dye solution.
According to the method for dyeing cotton yarn by the indigo non-reduction dyeing method, the dispersing agent is a dispersing agent for dispersing agents such as naphthalene sulfonic acid formaldehyde condensate (dispersing agent NNO), macromolecular dispersing agent lignosulfonate, dispersing agent MF or dispersing agent CNF which are commonly used in the printing and dyeing industry, the dispersing agent can be adsorbed on the surface of particles to effectively reduce the surface tension between the particles and liquid, and the steric hindrance is formed among the particles to prevent aggregation of fine particles, so that the particles can be dispersed into a liquid medium more easily.
The method for dyeing cotton yarn by the indigo non-reduction dyeing method has the advantage that the particle size of indigo particles in the superfine indigo dye liquor is 100-600 nm.
The method for dyeing cotton yarn by the indigo non-reduction dyeing method adopts a high-temperature baking method for fixation treatment, and the baking can play a role in dye fixation;
the high temperature baking temperature is 140-160 ℃ and the time is 3-5 min.
The method for dyeing cotton yarn by the indigo non-reduction dyeing method comprises the steps that the high molecular polymer is aqueous polyurethane or polyacrylate derivative, the glass transition temperature of the high molecular polymer is 5-20 ℃, and the high molecular polymer is flexible.
The method for dyeing cotton yarn by the indigo non-reduction dyeing method adopts the high molecular polymer as the adhesive to slightly size the cotton yarn after the fixation treatment, and comprises the following steps: preparing a high polymer solution with the mass concentration of 5%, uniformly stirring, sizing the cotton yarn subjected to fixation treatment at room temperature, controlling the rolling surplus rate to be 100-120%, and then putting into an oven for drying.
The principle of the invention is as follows:
the molecular structure of the indigo is poor in affinity to cellulose fibers due to fewer or no hydrophilic groups and hydrogen bonds, so that the indigo has poor affinity to cellulose fibers, and the indigo dye dyeing method is focused on the principle of oxidation reduction to dye the indigo, because the indigo has carbonyl groups, and when dyeing, the indigo is reduced into leuco sodium salt in an alkaline medium through reducing agents such as sodium dithionite or thiourea dioxide and then dyed into insoluble dye lake after oxidation treatment, and then fixed on the fibers. The invention develops a new way, the specific surface area can be increased by finely grinding the indigo dye into nano-sized particles so as to better enter the fiber pores, meanwhile, the dispersant and peregal O added in the dye liquor help the indigo particles to be better and evenly dispersed in the dye liquor so that the indigo particles can form an aqueous film to wrap the indigo particles and better enter the fiber, and then the indigo dye liquor gradually finishes the dyeing of the indigo by contacting with the outer layer of the fiber and attaching to the surface of the fiber until the indigo particles infiltrate into the fiber under the high-temperature environment, thereby finishing the indigo dyeing; and then the coated film is destroyed by high-temperature baking, so that the indigo particles are fixed in the fiber, and the whole dyeing process is completed. However, the color fastness of the color yarn after high-temperature baking still does not meet the ideal requirement, so that the indigo particles are less likely to fall off after the subsequent slight sizing treatment of the color yarn, and the whole color fixation process is completed.
The beneficial effects are that:
(1) The invention adopts a non-reduction dyeing method for dyeing indigo dye, adds an effective dispersing agent and a surfactant into dye solution, so that the dye can be dispersed and stabilized in water, plays a role in transferring the dye in the subsequent dyeing, grinds the dye to a nano scale to facilitate the dye to be dyed in a molecular or molecular cluster state, and then adopts a dip dyeing high-temperature baking method for dyeing cotton yarn and carries out proper post-treatment and slight sizing treatment. The dyeing liquid does not need to be abandoned, the subsequent vat can be reused after concentration adjustment, slight soap boiling is performed after fixation by high-temperature baking, and the energy consumption and the wastewater quantity are greatly reduced compared with the conventional indigo dyeing; the soaping-resistant color fastness of dyed cotton yarn reaches more than 3 levels;
(2) The invention does not relate to a series of reducing agents such as sodium hydrosulfite, greatly reduces the toxicity of dye liquor wastewater, has less energy consumption and has the characteristic of green environmental protection.
Detailed Description
The invention is further described below in conjunction with the detailed description. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
The lignosulfonate used in the examples of the present invention was derived from Synechocystis, inc., CAS number 8061-51-6.
Some performance indexes related in the embodiment of the invention adopt the following test methods:
(1) K/S value: detecting the K/S value of the indigo cotton yarn by using a Datacolor 850 color measuring and matching instrument;
(2) Number of dry abrasion resistant stages: testing the dry abrasion resistance level of the indigo cotton yarn by using GB/T3920-2008 textile color fastness detection rubbing color fastness;
(3) Wet abrasion resistance progression: testing the wet abrasion resistance level of the indigo cotton yarn by using GB/T3920-2008 textile color fastness to rubbing color fastness;
(4) Wash fastness: the washing fastness of indigo cotton yarn was tested using GB/T3921-2008 "textile colour fastness test soaping fastness".
Example 1
A method for dyeing cotton yarn by indigo non-reduction dyeing method comprises the following specific steps:
(1) Firstly dispersing indigo dye into water to prepare indigo dye solution with the bath ratio of 1:20, and then sequentially or simultaneously adding dispersant NNO and peregal O-25 into the indigo dye solution to obtain mixed solution;
wherein, the addition amount of the dispersant NNO is 3% of the mass of the indigo dye, and the addition amount of peregal O-25 is 5% of the mass of the indigo dye liquor;
(2) Carrying out superfine micronization treatment on the mixed solution prepared in the step (1) by adopting a horizontal sand mill to obtain superfine indigo dye liquor with the particle size of 196.7 nm;
(3) Adopting the superfine indigo dye liquor obtained in the step (2) to carry out high Wen Jinran min on cotton yarn at 80 ℃, and then carrying out high-temperature baking at 160 ℃ for 3min to carry out fixation;
(4) Adopting aqueous polyurethane with glass transition temperature of 5 ℃ as an adhesive to prepare aqueous polyurethane solution with mass concentration of 5%;
(5) Uniformly stirring the aqueous polyurethane solution obtained in the step (4) to obtain slurry, sizing the cotton yarn subjected to the color fixation treatment in the step (3) at room temperature, controlling the rolling surplus rate to be 100%, and then putting the cotton yarn into an oven to be dried to constant weight at 110 ℃ to obtain indigo cotton yarn with the sizing rate of 4.8%;
the K/S value of the indigo cotton yarn is 7.418, the dry abrasion resistance level is 3.5, and the wet abrasion resistance level is 3.
Comparative example 1
A method for dyeing cotton yarn by an indigo non-reduction dyeing method comprises the following steps of substantially the same as in example 1, wherein the dispersant NNO is not added in the step (1);
the K/S value of the obtained indigo cotton yarn is 3.5658, the dry abrasion resistance level is 2.5, and the wet abrasion resistance level is 2.
Comparing comparative example 1 with example 1, it was found that the K/S value of the indigo cotton yarn prepared in comparative example 1 was significantly reduced and the dyed cotton yarn was more non-uniform in color than example 1 because the indigo dye liquor was not uniformly dispersed without the addition of the dispersing agent, and the indigo particles were large in size and extremely high in size, thus resulting in poor penetration effect of the dyed cotton yarn and easy surface dyeing and poor color fastness.
Comparative example 2
A method for dyeing cotton yarn by an indigo non-reduction dyeing method comprises the following steps of substantially the same as in example 1, wherein in the step (1), peregal O-25 is not added;
the K/S value of the obtained indigo cotton yarn is 7.35, the dry-grinding resistance level is 3, and the wet-grinding resistance level is 2.
Comparing comparative example 2 with example 1, it was found that the K/S value, dry abrasion resistance and wet abrasion resistance of comparative example 2 were lower than those of example 1, because the addition of peregal O-25 resulted in uneven dyeing liquor and precipitation, and the amount of cotton yarn actually dyed was greatly reduced, and the K/S value was also lower.
Example 2
A method for dyeing cotton yarn by indigo non-reduction dyeing method comprises the following specific steps:
(1) Firstly dispersing indigo dye into water to prepare indigo dye solution with a bath ratio of 1:20, and then sequentially adding dispersant NNO and peregal O-25 into the indigo dye solution to obtain mixed solution;
wherein, the addition amount of the dispersant NNO is 5% of the mass of the indigo dye, and the addition amount of peregal O-25 is 5% of the mass of the indigo dye liquor;
(2) Carrying out superfine micronization treatment on the mixed solution prepared in the step (1) by adopting a horizontal sand mill to obtain superfine indigo dye liquor with the particle size of 215.5 nm;
(3) Adopting the superfine indigo dye liquor obtained in the step (2) to carry out high Wen Jinran min on cotton yarn at 80 ℃, and then carrying out high-temperature baking at 160 ℃ for 3min to carry out fixation;
(4) A polyacrylate derivative PA2120 with a glass transition temperature of 20 ℃ is adopted as an adhesive to prepare an adhesive PA2120 solution with a mass concentration of 5%;
(5) Uniformly stirring the adhesive PA2120 solution obtained in the step (4) to obtain slurry, sizing the cotton yarn subjected to the color fixation treatment in the step (3) at room temperature, controlling the rolling surplus rate to be 100%, and then putting the cotton yarn into an oven to be dried to constant weight at 110 ℃ to obtain indigo cotton yarn with sizing rate of 5%;
the K/S value of the indigo cotton yarn is 8.350, the dry abrasion resistance level is 3.5, and the wet abrasion resistance level is 2.5.
Example 3
A method for dyeing cotton yarn by indigo non-reduction dyeing method comprises the following specific steps:
(1) Firstly dispersing indigo dye into water to prepare indigo dye solution with a bath ratio of 1:20, and then sequentially adding dispersant NNO and peregal O-25 into the indigo dye solution to obtain mixed solution;
wherein, the addition amount of the dispersant NNO is 2% of the mass of the indigo dye, and the addition amount of peregal O-25 is 5% of the mass of the indigo dye liquor;
(2) Carrying out superfine micronization treatment on the mixed solution prepared in the step (1) by adopting a horizontal sand mill to obtain superfine indigo dye liquor with the particle size of 145.3 nm;
(3) Adopting the superfine indigo dye liquor obtained in the step (2) to carry out high Wen Jinran min on cotton yarn at 80 ℃, and then carrying out high-temperature baking at 160 ℃ for 3min to carry out fixation;
(4) A polyacrylate derivative PA2120 with a glass transition temperature of 20 ℃ is adopted as an adhesive to prepare a PA2120 solution with a mass concentration of 5%;
(5) Uniformly stirring the PA2120 solution obtained in the step (4) to obtain slurry, sizing the cotton yarn subjected to the color fixation treatment in the step (3) at room temperature, controlling the rolling surplus rate to be 100%, and then putting the cotton yarn into an oven to be dried to constant weight at 110 ℃ to obtain indigo cotton yarn with the sizing rate of 4.8%;
the K/S value of the indigo cotton yarn is 8.8942, the dry abrasion resistant level is 4.5, and the wet abrasion resistant level is 3.
The indigo cotton yarn in examples 1 to 3 was subjected to a color fastness to washing test, specifically, the test sample was wrapped with lining cloth sewn with six fibers of wool, acrylic fiber, polyester, nylon, cotton and acetate fiber, respectively, and the test sample was put into an instrument for the color fastness to washing test, and then the color conditions of the six fibers on the lining cloth were compared to obtain a color stage number, and the test results were as shown in table 1 below:
table 1 color fastness of six fibers in the Lining cloth
Claims (8)
1. A method for dyeing cotton yarn by an indigo non-reduction dyeing method, which is characterized in that: preparing mixed solution of indigo dye, dispersant and peregal O, performing superfine micronization treatment on the prepared mixed solution to obtain superfine indigo dye solution, performing high Wen Jinran and fixation treatment on cotton yarn by adopting the superfine indigo dye solution, and performing slight sizing on the cotton yarn subjected to the fixation treatment by adopting a high polymer as an adhesive to obtain indigo cotton yarn;
the particle size of the indigo particles in the superfine indigo dye liquor is nano-scale;
the high-temperature dip dyeing temperature is 75-85 ℃;
the fixation treatment adopts a high-temperature baking method;
the high temperature baking temperature is 140-160 ℃ and the time is 3-5 min;
slight sizing means that the sizing rate of the indigo cotton yarn is 3.5-5.5%.
2. The method for dyeing cotton yarn by the indigo non-reduction dyeing method according to claim 1, wherein the preparation of the mixed solution of the indigo dye, the dispersing agent and the peregal O is as follows: preparing an indigo dye solution with a bath ratio of 1:10-30, and adding a dispersing agent and peregal O into the indigo dye solution to obtain a mixed solution.
3. The method for dyeing cotton yarn by the indigo non-reduction dyeing method according to claim 2, wherein the addition amount of the dispersing agent is 2-5% of the mass of the indigo dye, and the addition amount of peregal O is 2-5% of the mass of the indigo dye liquor.
4. A method of dyeing cotton yarn by indigo non-reduction dyeing according to claim 3 characterised in that the dispersant is naphthalene sulphonic acid formaldehyde condensate, lignosulphonate, dispersant MF or dispersant CNF.
5. The method for dyeing cotton yarn by the indigo non-reduction dyeing method according to claim 1, wherein the particle size of the indigo particles in the ultra-fine indigo dye liquor is 100-600 nm.
6. The method for dyeing cotton yarn by indigo non-reduction dyeing according to claim 1, wherein the high molecular polymer is aqueous polyurethane or polyacrylate derivative.
7. The method for dyeing cotton yarn by indigo non-reduction dyeing according to claim 6, wherein the glass transition temperature of the high molecular polymer is 5-20 ℃.
8. The method for dyeing cotton yarn by the indigo non-reduction dyeing method according to claim 1, wherein the process of slightly sizing the cotton yarn after the fixation treatment by using a high molecular polymer as a binder is as follows: preparing a high polymer solution with the mass concentration of 5%, uniformly stirring, sizing the cotton yarn subjected to fixation treatment at room temperature, controlling the rolling surplus rate to be 100-120%, and then putting into an oven for drying.
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| US6004358A (en) * | 1996-07-16 | 1999-12-21 | Basf Aktiengesellschaft | Batchwise dyeing of cellulosic textile material with indigo by the exhaust method |
| WO2009051569A2 (en) * | 2007-10-18 | 2009-04-23 | Univerza V Mariboru Fakulteta Za Strojnistvo | Process of dyeing cellulose and polyamide textile materials with enzyme reduced indigo |
| KR20140102823A (en) * | 2013-02-15 | 2014-08-25 | 정현자 | The manufacturing method of natural dye using indigo and the dying procedure using thereof |
| CN109736105A (en) * | 2019-03-19 | 2019-05-10 | 南通大学 | A kind of multi-color spectrum ecological health colouring method of dyestuff |
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| CN110656510A (en) * | 2019-10-15 | 2020-01-07 | 常州大学 | Preparation method of indigo dyed antibacterial textile |
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| KR20140102823A (en) * | 2013-02-15 | 2014-08-25 | 정현자 | The manufacturing method of natural dye using indigo and the dying procedure using thereof |
| KR102027427B1 (en) * | 2018-04-24 | 2019-10-01 | 재단법인 환동해산업연구원 | Composition and Method for dyeing indigo without alkali and reducing agent |
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