CN115679718A - Method for dyeing cotton yarn by indigo non-reduction dye-penetration method - Google Patents
Method for dyeing cotton yarn by indigo non-reduction dye-penetration method Download PDFInfo
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Abstract
The invention relates to a method for dyeing cotton yarn by an indigo non-reduction dye-penetration method, which comprises the steps of firstly preparing a mixed solution from an indigo dye, a dispersant and peregal O, then carrying out superfine micronization treatment on the prepared mixed solution to obtain superfine indigo dye solution, then carrying out high-temperature dip dyeing and color fixing treatment on the cotton yarn by adopting the superfine indigo dye solution, and finally carrying out slight sizing on the cotton yarn after the color fixing treatment by adopting a high molecular polymer as an adhesive to obtain the indigo cotton yarn; the grain diameter of the indigo particles in the superfine indigo dye solution is nano-scale; the high-temperature dip dyeing temperature is 75-85 ℃; the light sizing means that the sizing rate of the indigo cotton yarn is 3.5-5.5%; the grain diameter of the indigo grains in the superfine indigo dye solution is 100-600 nm. The invention does not relate to a series of reducing agents such as sodium hydrosulfite and the like, greatly reduces the toxicity of the dye liquor wastewater, has less energy consumption and has the characteristic of 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 yarns by an indigo non-vat bleed method.
Background
Indigo dye is one of the first natural dyes used by human beings, indigo is a vat dye, belongs to the Indian-field family, and plant indigo has a long history all over the world, and is widely applied to food processing, printing and dyeing industry, painting and coating, cosmetic coloring and the like. The blue grass is an important dye source in China from ancient times, and through production practices, the extraction and dyeing technology of the indigo dye is gradually improved and becomes an independent handicraft industry.
Indigo dye as a vat dye generally comprises the following four steps: (1) reduction of the dye: firstly, the dye is reduced into leuco body by strong reducing agents such as sodium hydrosulfite and the like in an alkaline medium. (2) staining of leuco bodies: leuco dyes have a greater affinity for cellulose and therefore can rapidly dye cotton-type fabrics. (3) oxidation of leuco bodies: after the fibers are dyed by the vat dye leuco body, the leuco body needs to be oxidized in air or other modes to be converted into insoluble dye to be fixed on fabrics, so that the color fastness is obtained. (4) oxidation post-treatment: the oxidized yarn or fabric can obtain ideal color fastness only through proper post-treatment, the main process of the post-treatment is soaping, and 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 color light.
The artificial synthesis of indigo dye since the end of the 19 th century appeared, which quickly replaced the plant indigo, and apparel dyed with indigo quickly occupied the global market and was called denim. The denim fabric is popular among workers as a rough cotton fabric, and the denim fabric has a light weight in daily wearing and putting up due to the rough fabric style and the simple and fashionable color matching. At present, a yarn type sizing and dyeing combination machine is commonly used for dyeing denim fabric, dyeing is carried out at normal temperature, the process route needs up to 10 times of dyeing and oxidation, most of reducing agents for reducing dyes are sodium hydrosulfite, the reducing agents are known as sodium hydrosulfite, and the reducing potential can reach-1137 mV at 0.5mol/L and is far greater than-760 mV required by indigo, so that almost any reducing dye can be reduced. But because of the unstable chemical property, the waste water can quickly react in air or aqueous solution and can be oxidized to generate sulfite and thiosulfate ions, and the ions have corrosiveness, so that the COD of the printing and dyeing wastewater is higher than that of the printing and dyeing wastewater, and the waste water is a great problem in environmental-friendly production and recycling. In recent years, other reducing agents have been introduced into the market for vat dye dyeing, such as thiourea dioxide, which has the advantage of better chemical stability, and is oxidized in an alkaline solution to form sulfate and urea, which is basically harmless to the environment, but has not been used on a large scale because of the higher cost, which increases the production cost.
Therefore, it is very important to develop a method for dyeing cotton yarn without using a reducing agent and obtaining a good effect.
Disclosure of Invention
The invention aims to solve the problems that the indigo dye needs to be subjected to reduction and oxidation steps and environmental pollution caused by a reducing agent in the prior art, and provides a method for dyeing cotton yarns by an indigo non-reduction dye-penetration method. The invention provides a method for dyeing cotton yarns by an indigo non-reduction penetration dyeing method, which comprises the steps of preparing superfine indigo dyeing solution, dyeing the cotton yarns at high temperature, carrying out aftertreatment on the dyed cotton yarns and improving the color fastness of the dyed yarns. The molecular cluster dye-penetrating method is adopted, the traditional step of reducing indigo dye into leuco body and then dyeing and oxidizing is not adopted, the consumption of chemical agents such as sodium hydrosulfite, strong alkali and the like is saved, the harmfulness of dye liquor wastewater is reduced, the method has the characteristics of cleanness and environmental protection, the dyeing step is simplified, the production period is shortened, the production cost is effectively reduced, and the method has the potential of sustainable development.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for dyeing cotton yarn on indigo non-reduction penetration dyeing method, formulate indigo dyestuff and dispersant, peregal O into the mixed solution at first, then carry on the superfine micronization treatment to the mixed solution formulated to get superfine indigo dyeing liquor (the superfine micronization treatment can use the commonly used grinding equipment, including ceramic sand mill, nanometer grinder, etc. to carry on the grinding treatment to the indigo dyeing liquor, the grinding treatment can reduce the indigo granule size effectively, make it reach the micron or even nanometer scale, has increased its specific surface area, help to permeate and improve the color light of dyestuffs), use superfine indigo dyeing liquor to carry on high-temperature dip dyeing and color fixing treatment to the cotton yarn, use the high molecular polymer as the adhesive to carry on the sizing slightly to the cotton yarn after the color fixing treatment to get indigo cotton yarn;
the grain diameter of the indigo particles in the superfine indigo dye solution is nano-scale;
the high-temperature dip dyeing temperature is 75-85 ℃;
the light sizing means that the sizing rate of the indigo cotton yarn is 3.5-5.5%.
The method for dyeing cotton yarn by indigo comprises the step of dyeing by a dip dyeing method at a temperature without reducing the indigo dye into leuco bodies and oxidizing the leuco bodies. In the dip dyeing process, the indigo particles reach the fiber surface and are adsorbed on the fiber surface, the particle size of the indigo particles reaches the nanometer level under the grinding effect, the pore size of the cotton fiber is increased under the action of high temperature, dye molecules freely diffuse into the fiber and are embedded in the pore size of the fiber, and along with the continuous dissolution and adsorption of the dye particles, the dye in the dispersant micelle is released and supplemented into a dye solution for further diffusion and adsorption.
The sizing can reduce yarn surface hairiness 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 dyed yarn, so that the indigo dye is better fixed on the yarn and is not easy to fall off, and the purpose of improving the color durability is achieved.
As a preferable technical scheme:
in the method for dyeing cotton yarn by the indigo non-reduction bleed method, the step of preparing the mixed solution of the indigo dye, the dispersant and the peregal O is as follows: firstly preparing the indigo dyeing solution with the bath ratio of 1.
According to the method for dyeing cotton yarns by the indigo non-reduction dye-penetration method, the adding amount of the dispersing agent is 2-5% of the mass of the indigo dye, and the adding amount of the peregal O is 2-5% of the mass of the indigo dye solution.
The cotton yarn dyeing method by the indigo non-reduction dye-penetration method comprises the steps that the dispersing agent is a naphthalene sulfonic acid formaldehyde condensate (dispersing agent NNO), a high-molecular dispersing agent lignosulfonate, a dispersing agent MF or a dispersing agent CNF and other dispersing agents commonly used in the printing and dyeing and coating industries, the dispersing agent can be adsorbed on the surfaces of particles to effectively reduce the particles and liquid, the surface tension between the particles forms steric hindrance between the particles to prevent the fine particles from aggregating, and the particles are more easily dispersed into a liquid medium.
In the method for dyeing cotton yarn by the indigo non-reduction bleed method, the particle size of the indigo particles in the superfine indigo dyeing solution is 100-600 nm.
According to the method for dyeing cotton yarns by the indigo non-reduction dye-penetration method, the fixation treatment adopts a high-temperature baking method, and the baking can achieve the effect of dye fixation;
the high-temperature baking temperature is 140-160 ℃, and the time is 3-5 min.
According to the method for dyeing cotton yarns by the indigo non-reduction dye-penetration method, the high molecular polymer is aqueous polyurethane or polyacrylate derivatives, the glass transition temperature of the high molecular polymer is 5-20 ℃, and the high molecular polymer is a flexible polymer.
The method for dyeing cotton yarn by the indigo non-reduction dye-penetration method adopts the high molecular polymer as the adhesive to slightly size the cotton yarn after color fixing treatment, and comprises the following steps: preparing a high molecular polymer solution with the mass concentration of 5%, uniformly stirring, sizing the cotton yarn subjected to color fixing treatment at room temperature, controlling the rolling residual rate to be 100-120%, and then putting the cotton yarn into an oven for drying.
The principle of the invention is as follows:
the molecular structure of indigo determines that the affinity of the molecular structure to cellulose fibers is poor due to few or no hydrophilic groups and hydrogen bonds, and since the occurrence of synthetic indigo, people dye the indigo dye by focusing on the principle of redox because the indigo structure has carbonyl, and during dyeing, the indigo dye is reduced into leuco sodium salt by reducing agents such as sodium hydrosulfite or thiourea dioxide in an alkaline medium, then dyes the fibers, and is recovered into insoluble dye through oxidation treatment to be fixed on the fibers. The invention develops a new method, the specific surface area can be increased by finely grinding the indigo dye into particles with nanometer sizes, so that the indigo dye can better enter fiber pores, meanwhile, the dispersant and the peregal O which are added into the dye liquor help the indigo particles to be better and uniformly dispersed in the dye liquor so that the indigo particles can form an aqueous film to wrap the indigo particles and can better enter the fiber, and then under the high-temperature environment, the indigo dye liquor gradually finishes the process of contacting with the outer layer of the fiber and attaching to the surface of the fiber to infiltrate into the fiber, so that the infiltration of the indigo is finished; the coated film is then destroyed by means of a high-temperature baking, the indigo particles thereby becoming fixed within the fibre and the entire dyeing process being completed. However, the color fastness of the dyed yarns after high-temperature baking still does not meet the ideal requirement, so that the indigo particles are less prone to falling off after the subsequent slight sizing treatment of the dyed yarns, and the whole color fixing process is completed.
Has the beneficial effects that:
(1) The invention adopts a non-reduction penetration dyeing method for dyeing indigo dye, adds effective dispersant and surfactant into dye solution to ensure that the dye can be dispersed and stabilized in water and plays a role of transferring the dye during subsequent dyeing, then grinds the dye to a nano scale to be beneficial to the penetration dyeing of the dye in a molecular or molecular cluster state, and then adopts a dip dyeing and high-temperature baking method to dye cotton yarn and carries out proper post-treatment and slight sizing treatment on the cotton yarn. The dip dyeing solution does not need to be discarded, the concentration can be adjusted and then recycled in a vat, slight soap boiling is carried out after high-temperature baking and color fixing, and the energy consumption and the wastewater amount are greatly reduced compared with the conventional indigo dyeing; the soaping color fastness of the dyed cotton yarn reaches more than 3 grades;
(2) The invention does not relate to a series of reducing agents such as sodium hydrosulfite and the like, greatly reduces the toxicity of the dye liquor wastewater, has less energy consumption and has the characteristic of environmental protection.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention can be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the claims appended to the present application.
The lignosulfonate used in the examples of the present invention was derived from Heifeng Biotechnology Inc., CAS number 8061-51-6.
Some performance indexes related in the embodiment of the invention adopt the following test method:
(1) K/S value: detecting the K/S value of the indigo cotton yarn by adopting a Datacolor 850 color measuring and matching instrument;
(2) Dry abrasion resistance stage number: testing the dry abrasion resistance grade number of the indigo cotton yarn by GB/T3920-2008 'color fastness to rubbing detection of textiles';
(3) Wet abrasion resistance number of stages: testing the wet abrasion resistance grade number of the indigo cotton yarn by GB/T3920-2008 'color fastness to rubbing test for textiles';
(4) Color fastness to washing: the color fastness to washing of the indigo cotton yarn is tested by GB/T3921-2008 'soaping resistance color fastness of textile color fastness test'.
Example 1
A method for dyeing cotton yarn by an indigo non-reduction dye-penetration method comprises the following specific steps:
(1) Firstly, dispersing an indigo dye into water to prepare an indigo dye solution with a bath ratio of 1;
wherein the addition of the dispersant NNO is 3 percent of the mass of the indigo dye, and the addition of the peregal O-25 is 5 percent of the mass of the indigo dye solution;
(2) Carrying out ultra-fine granulation treatment on the mixed solution prepared in the step (1) by adopting a horizontal sand mill to obtain ultra-fine indigo dye liquor with indigo particles of 196.7nm in particle size;
(3) Carrying out high-temperature dip dyeing on cotton yarn for 40min at 80 ℃ by adopting the superfine indigo dyeing solution obtained in the step (2), and then carrying out high-temperature baking for 3min at 160 ℃ for fixation;
(4) Adopting waterborne polyurethane with the glass transition temperature of 5 ℃ as an adhesive to prepare a waterborne polyurethane solution with the mass concentration of 5%;
(5) Uniformly stirring the aqueous polyurethane solution obtained in the step (4) to obtain a slurry, sizing the cotton yarn subjected to color fixing treatment in the step (3) at room temperature, controlling the rolling residual rate at 100%, and then putting the cotton yarn into an oven to be dried at 110 ℃ to constant weight to obtain the indigo cotton yarn with the sizing rate of 4.8%;
the indigo cotton yarn has a K/S value of 7.418, a dry abrasion resistance grade of 3.5 grades, and a wet abrasion resistance grade of 3 grades.
Comparative example 1
The specific steps of the method for dyeing cotton yarns by the indigo non-reduction dye-penetration method are basically the same as those of the example 1, and only the difference is that no dispersant NNO is added in the step (1);
the obtained indigo cotton yarn has a K/S value of 3.5658, a dry abrasion resistance grade of 2.5 grades and a wet abrasion resistance grade of 2 grades.
Comparing comparative example 1 with example 1, it can be seen that the K/S value of the indigo cotton yarn prepared in comparative example 1 is significantly reduced, and the dyed cotton yarn has more uneven color than that of example 1 because the indigo dye solution is not uniformly dispersed without adding a dispersant, and the indigo has a large particle size and is highly uneven in particle size, thus resulting in poor penetration effect of the dyed cotton yarn and easy surface dyeing, resulting in poor color fastness.
Comparative example 2
A method for dyeing cotton yarn by an indigo non-reduction dye-penetration method, the concrete steps are basically the same as example 1, the difference is that no peregal O-25 is added in the step (1);
the K/S value of the prepared indigo cotton yarn is 7.35, the dry abrasion resistance grade is 3 grades, and the wet abrasion resistance grade is 2 grades.
Comparing comparative example 2 with example 1, it can be seen that comparative example 2 has a lower K/S value, a lower dry abrasion resistance level and a lower wet abrasion resistance level than example 1 because the absence of the leveling agent O-25 causes the dye liquor to be non-uniform and the precipitation phenomenon is observed, which results in a large decrease in the amount of cotton yarn actually dyed and thus a lower K/S value.
Example 2
A method for dyeing cotton yarns by an indigo non-reduction penetration dyeing method comprises the following specific steps:
(1) Firstly, dispersing an indigo dye into water to prepare an indigo dye solution with a bath ratio of 1;
wherein the addition amount of the dispersant NNO is 5% of the mass of the indigo dye, and the addition amount of the peregal O-25 is 5% of the mass of the indigo dye solution;
(2) Carrying out ultra-fine granulation treatment on the mixed solution prepared in the step (1) by adopting a horizontal sand mill to obtain ultra-fine indigo dye liquor with indigo particles of 215.5nm in particle size;
(3) Carrying out high-temperature dip dyeing on cotton yarn for 40min at 80 ℃ by adopting the superfine indigo dyeing solution obtained in the step (2), and then carrying out high-temperature baking for 3min at 160 ℃ for fixation;
(4) Preparing a 5% adhesive PA2120 solution by using a polyacrylate derivative PA2120 with a glass transition temperature of 20 ℃ as an adhesive;
(5) Uniformly stirring the PA2120 solution of the adhesive obtained in the step (4) to obtain a slurry, sizing the cotton yarn subjected to color fixing treatment in the step (3) at room temperature, controlling the rolling retention rate at 100%, and then putting the cotton yarn into an oven to dry at 110 ℃ to constant weight to obtain indigo cotton yarn with the sizing rate of 5%;
the indigo cotton yarn has a K/S value of 8.350, a dry abrasion resistance grade of 3.5 grades and a wet abrasion resistance grade of 2.5 grades.
Example 3
A method for dyeing cotton yarn by an indigo non-reduction dye-penetration method comprises the following specific steps:
(1) Firstly, dispersing an indigo dye into water to prepare an indigo dye solution with a bath ratio of 1;
wherein the addition amount of the dispersant NNO is 2% of the mass of the indigo dye, and the addition amount of the peregal O-25 is 5% of the mass of the indigo dye solution;
(2) Carrying out ultra-fine granulation treatment on the mixed solution prepared in the step (1) by adopting a horizontal sand mill to obtain ultra-fine indigo dye liquor with indigo particles of 145.3nm in particle size;
(3) Carrying out high-temperature dip dyeing on cotton yarn for 40min at 80 ℃ by adopting the superfine indigo dyeing solution obtained in the step (2), and then carrying out high-temperature baking for 3min at 160 ℃ for fixation;
(4) Preparing a PA2120 solution with the mass concentration of 5% by using a polyacrylate derivative PA2120 with the glass transition temperature of 20 ℃ as an adhesive;
(5) Uniformly stirring the PA2120 solution obtained in the step (4) to obtain a slurry, sizing the cotton yarn subjected to color fixing treatment in the step (3) at room temperature, controlling the rolling retention rate at 100%, and then putting the cotton yarn into an oven to be dried at 110 ℃ to constant weight to obtain indigo cotton yarn with the sizing rate of 4.8%;
the indigo cotton yarn has a K/S value of 8.8942, a dry abrasion resistance grade of 4.5 grades, and a wet abrasion resistance grade of 3 grades.
The indigo cotton yarns in the embodiments 1 to 3 are subjected to a color fastness to washing test, specifically, a sample to be tested is wrapped by lining cloth sewn by using six fibers of wool, acrylic fiber, polyester fiber, nylon, cotton and acetate fiber, and the sample is put into an instrument for color fastness to washing test, and then the staining conditions of the six fibers on the lining cloth are compared to obtain staining orders, wherein the test results are as shown in the following table 1:
TABLE 1 color fastness of six fibers in the interlining
Claims (9)
1. A method for dyeing cotton yarn by an indigo non-reduction dye-penetration method is characterized by comprising the following steps: firstly, preparing a mixed solution from an indigo dye, a dispersing agent and peregal O, performing ultrafine micronization treatment on the prepared mixed solution to obtain an ultrafine indigo dye solution, performing high-temperature dip dyeing and color fixing treatment on cotton yarns by using the ultrafine indigo dye solution, and finally performing slight sizing on the cotton yarns subjected to the color fixing treatment by using a high molecular polymer as an adhesive to obtain indigo cotton yarns;
the grain diameter of the indigo particles in the superfine indigo dye solution is nano-scale;
the high-temperature dip dyeing temperature is 75-85 ℃;
the light 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 bleed method according to claim 1, wherein the step of preparing the indigo dye, the dispersant and the peregal O into a mixed solution comprises the following steps: firstly preparing an indigo dye solution with a bath ratio of 1.
3. The method for dyeing cotton yarn by the indigo non-reduction bleed method according to claim 2, wherein the addition amount of the dispersant is 2-5% of the mass of the indigo dye, and the addition amount of the peregal O is 2-5% of the mass of the indigo dye solution.
4. The method for dyeing cotton yarn by indigo non-reductive bleed according to claim 3, wherein the dispersant is naphthalene sulfonic acid formaldehyde condensate, lignosulfonate, dispersant MF or dispersant CNF.
5. The method for dyeing cotton yarn according to claim 1, wherein the particle size of the indigo particles in the ultra-fine indigo dyeing solution is 100 to 600nm.
6. The method for dyeing cotton yarn by the indigo non-reduction dyeing method according to claim 1, characterized in that the fixation treatment adopts a high-temperature baking method;
the high-temperature baking temperature is 140-160 ℃, and the time is 3-5 min.
7. The method for dyeing cotton yarn by indigo non-reductive infiltration according to claim 1, wherein the high molecular polymer is an aqueous polyurethane or polyacrylate derivative.
8. The method for dyeing cotton yarn by indigo non-reduction exhaust dyeing according to claim 7, wherein the glass transition temperature of the high molecular polymer is 5-20 ℃.
9. The method for dyeing cotton yarn by the indigo non-reduction bleed method according to claim 1, wherein the process of slightly sizing the fixed cotton yarn by using a high molecular polymer as a binder comprises the following steps: preparing a high molecular polymer solution with the mass concentration of 5%, uniformly stirring, sizing the cotton yarn subjected to color fixing treatment at room temperature, controlling the rolling residual rate to be 100-120%, and then putting the cotton yarn into an oven for drying.
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