CN110219184B - Salt-free cold pad-batch dyeing method for uncooked bleached cotton fibers - Google Patents
Salt-free cold pad-batch dyeing method for uncooked bleached cotton fibers Download PDFInfo
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- CN110219184B CN110219184B CN201910493086.9A CN201910493086A CN110219184B CN 110219184 B CN110219184 B CN 110219184B CN 201910493086 A CN201910493086 A CN 201910493086A CN 110219184 B CN110219184 B CN 110219184B
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/38—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using reactive dyes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/90—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using dyes dissolved in organic solvents or aqueous emulsions thereof
- D06P1/92—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using dyes dissolved in organic solvents or aqueous emulsions thereof in organic solvents
- D06P1/928—Solvents other than hydrocarbons
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/58—Material containing hydroxyl groups
- D06P3/60—Natural or regenerated cellulose
- D06P3/66—Natural or regenerated cellulose using reactive dyes
Abstract
The invention provides a salt-free cold pad-batch dyeing method for uncooked and bleached cotton fibers, which belongs to the field of cotton fiber printing and dyeing, and is characterized in that reactive dye and alkaline substances are placed in a mixed solution of an alcohol organic solvent-water system to prepare a dye solution; placing the uncooked and bleached cotton fiber in a prepared dye solution, and padding the dye solution by adopting a two-dip and two-pad mode; rolling the dyed uncooked and bleached cotton fibers on a rolling machine, and rotationally stacking the rolled uncooked and bleached cotton fibers after being wrapped by a plastic film; after stacking, soaping, hot water washing, cold water washing and drying are carried out; the method combines the characteristics of high dye-uptake rate and high dye-uptake rate of the dye in an ethanol-water system, can quickly dye uncooked and unbleached cotton fiber by using the reactive dye through a padding method under the action of high ethanol permeability, can slowly combine the dyed cotton fiber with hydroxyl on cellulose through covalent bonds for dyeing under the condition of stacking at normal temperature, and improves the color fixation rate of the reactive dye in an alcohol organic solvent-water system under the condition of normal temperature.
Description
Technical Field
The invention belongs to the field of cotton fiber printing and dyeing, and particularly relates to a salt-free cold pad-batch dyeing method for uncooked and bleached cotton fibers.
Background
The cotton fiber is a natural cellulose fiber for textile with the largest dosage due to the advantages of strong hygroscopicity, comfortable wearing, easy dyeing and the like, however, as the surface of the cotton fiber contains impurities such as pectin, wax, cottonseed hulls, lignin and the like, active groups on dye molecules are easy to react with hydroxyl groups on cellulose in the dyeing process of the cotton fiber to influence the dyeing performance of the cotton fiber, and as the bonding fastness of the active groups on the dye molecules and the chemical bonds of the cellulose is high, the hydroxyl groups on the macromolecular side chains of the cellulose fiber enable the fabric fiber to be electronegative in solution, and water-soluble groups contained in the active dye exist in dye liquor in an anionic form, therefore, the dye needs to be adsorbed on the fiber to overcome certain charge hindrance.
In order to avoid the chemical bond binding reaction of active groups on dye molecules and cellulose and improve the utilization rate of the dye, at present, in the dyeing process, a large amount of inorganic salt is mainly added into the dye, for example, salt is added to improve the dye-uptake rate, or concentrated alkali is used for pretreating cotton fibers at high temperature before dyeing, a large amount of energy and water resources are consumed in the treatment process, a large amount of waste liquid is discharged, resources are wasted, and serious water and soil salinization problems can be caused by a large amount of saline-alkali discharge, so that the environment is seriously polluted.
The invention discloses a Chinese patent No. CN103556449B, which discloses a cold pad-batch pretreatment method for cotton textiles, wherein the method comprises the steps of changing a cold pad-batch process route of the cotton textiles and preparing alkali liquor and bleaching liquor in the cold pad-batch process of the cotton textiles, sequentially padding the cotton textiles with the alkali liquor formed by mixing a high proportion of alcohol organic solvent and sodium hydroxide and the bleaching liquor formed by mixing a high proportion of alcohol organic solvent and hydrogen peroxide, and then carrying out cold pad-batch pretreatment, thereby greatly reducing water consumption and improving treatment effect.
Chinese patent publication No. CN103498348A, entitled a salt-free low-alkali dyeing method for shortening dyeing time of reactive dyes, which adopts a method of dyeing textiles to be dyed with alkali liquor in dye liquor formed by mixing high-proportion alcohol organic solvent, a small amount of water and dyes.
The invention discloses a method for carrying out salt-free pad dyeing on cotton textiles by using reactive dyes, which is disclosed by Chinese patent No. CN 103469624B. Although the method solves the problems of large salt consumption and water consumption in the traditional pad dyeing process, the method has the defects that the method needs to dry cotton textiles, the process is complex, and the temperature is higher in the color fixing treatment after the dyeing process.
The invention discloses a method for dyeing textiles by using dye liquor which is mutually soluble of an organic solvent and water, and is published in China patent grant No. CN 103015231B. Firstly, the textile is soaked in an accelerating agent solution twice, and then the soaked textile is placed in a dye solution formed by mixing an organic solvent and water for dyeing. Although the method has the advantages of low water consumption and energy consumption and improves the utilization rate of the dye, the method has the defect of high temperature in the fixation treatment after the dyeing process.
It can be found from the existing traditional dyeing process that although the problems of large water consumption and salt consumption are solved by adopting an ethanol-water system and the problem of no need of soaking in water bath for a long time is solved by pad dyeing in the prior art, the dye fixing process still needs to be carried out at a higher temperature, and other solutions are often needed to be added in the pretreatment process to improve the utilization rate and dye uptake of the dye, so that a method is needed to be provided for improving the color fixing and simplifying the operation process.
Disclosure of Invention
Aiming at the problems in the prior art, the method combines the characteristics of high dye-uptake rate and high dye-uptake rate of the dye in an ethanol-water system, can quickly dye the uncooked and unbleached cotton fiber by the reactive dye through a padding method under the characteristic of high ethanol permeability, and can slowly combine the dyed cotton fiber with hydroxyl on cellulose through covalent bonds under the condition of stacking at normal temperature to dye, so that the color fixation rate of the reactive dye under the normal temperature condition is improved.
A salt-free cold pad-batch dyeing method for uncooked bleached cotton fibers comprises the following steps:
s1, preparing a dye solution: putting the reactive dye and the alkaline substance into a mixed solution of an alcohol organic solvent-water system, and stirring uniformly to prepare a dye solution;
s2, padding a dye solution: placing the uncooked and bleached cotton fiber in a prepared dye solution for padding;
s3, rolling and stacking: rolling the uncooked bleached cotton fiber dyed in the step S2 on a rolling machine, and wrapping the rolled uncooked bleached cotton fiber by a plastic film and then rotationally stacking;
s4, washing: and (4) soaping, hot water washing, cold water washing and drying the uncooked and bleached cotton fiber treated in the step S3 to obtain a finished product.
Further, in step S1, the volume ratio of the alcohol organic solvent to the water in the dye solution is 80 percent to 20 percent to 95 percent to 5 percent.
Further, the alcohol organic solvent is ethanol.
Further, in step S1, the alkaline substance is one of sodium carbonate, sodium bicarbonate, and sodium hydroxide.
Further, in step S1, the concentration of the reactive dye in the dye solution is 5-25 g/L, and the concentration of the alkaline substance is 25-35 g/L.
Further, in step S2, padding the padding dye liquor for 5-30S at a bath ratio of 1: 20-30 at a temperature of 25-30 ℃,
further, in step S2, the padding mode is two-padding and two-rolling.
Further, the mangle ratio of the uncooked and bleached cotton fiber after the dye liquor is padded in the step S2 is 70-120%.
Further, in the step S3, the stacking temperature is 25-35 ℃, the stacking time is 8-24 hours, and the rotating speed is 5-10 r/min.
Further, the un-boiled and bleached cotton fiber is one of un-boiled and bleached cotton loose fiber, un-boiled and bleached cotton yarn or un-boiled and bleached cotton sliver.
The dyeing mechanism of the invention is as follows: the textile is pad-dyed and fixed by using the dye liquor prepared by mixing a high-proportion alcohol organic solvent, a small amount of water, a dye and a fixing agent by changing the preparation method of the dye liquor and the fixing liquor in the textile pad-dyeing process, the textile is directly dyed without pretreatment, and the concentration of the dye is greatly improved and the dye uptake rate of the dye on the textile is improved due to the reduction of the water amount in the dye liquor prepared by mixing the high-proportion alcohol organic solvent, the small amount of water and the dye; due to the reduction of water, the hydrolysis of the dye is reduced, so that the utilization rate of the dye is increased; the dielectric constant of the alcohol organic solvent is larger than that of water, so that the polarity of the alcohol organic solvent is smaller than that of water. Therefore, the polarity of the whole dye liquor is increased, the reaction speed between the dye and the fiber is increased, and the fixation rate of the dye on the fiber is improved. Meanwhile, the addition of the alcohol organic solvent reduces the surface tension of the dye solution, dye molecules are easier to undergo nucleophilic substitution and nucleophilic addition reaction to form a dye fiber covalent bond, and a large amount of alcohol organic solvent and a small amount of water in the dye bath can effectively prevent the dye from hydrolyzing and falling off, so that the utilization rate of the dye is improved. Therefore, the invention solves the problems of low dye utilization rate and poor fixation rate in the traditional pad dyeing process.
Advantageous effects
(1) The uncooked and bleached cotton fiber can be directly dyed without pretreatment, a higher color fixing rate is achieved, the problem of unsatisfactory color fixing rate caused by hydrolysis or uneven dyeing in the existing reactive dye dyeing process is solved, the sewage discharge is reduced, the dye content in sewage is reduced, the energy is saved, the salt-free dyeing of the uncooked and bleached cotton fiber is realized, the dyeing process is simple to operate, and the dyeing process is green and environment-friendly.
(2) The method combines the characteristics of high dye-uptake rate and high dye-uptake of the dye in an ethanol-water system, can quickly dye the uncooked and unbleached cotton fiber by the reactive dye through a padding method under the characteristic of high ethanol permeability, and can slowly combine the dyed cotton fiber with hydroxyl on cellulose through covalent bonds under the condition of stacking at normal temperature for dyeing, so that the color fixation rate of the reactive dye under the normal temperature condition is improved.
(3) The dyeing method adopts an ethanol-water system during dyeing, the system contains a small amount of water to swell the fiber, dissolve the reactive dye, reduce the hydrolysis of the reactive dye and improve the fixation rate and the dye uptake rate, toxic substances such as acetone, isopropanol, ethylene glycol dimethyl ether, tetrachloroethylene and the like are avoided, nontoxic ethanol is used as a solvent, the environmental pollution is reduced, and the ethanol has a low boiling point and is easy to recover and reuse.
(4) The cold pad-batch dyeing process used in the invention is dip-dyed at normal temperature, has simple dyeing process and convenient operation, and is a process with low energy consumption, high efficiency and short flow.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1
S1, preparing a dye solution: placing activated red 195 and sodium carbonate into a mixed solution of ethanol and water, and stirring uniformly to prepare a dye solution, wherein the volume ratio of the ethanol to the water in the dye solution is 80%: 20 percent, the concentration of the reactive dye in the dye solution is 5g/L, and the concentration of the sodium carbonate is 25 g/L;
s2, padding a dye solution: placing the uncooked and bleached cotton yarn into a prepared dye solution, padding for 30s at the temperature of 25 ℃, and soaking for two padding with the dye solution at a bath ratio of 1:20, so that the padding allowance of the uncooked and bleached cotton yarn after padding with the dye solution is 70%;
s3, rolling and stacking: rolling the uncooked bleached cotton yarn dyed in the step S2 on a rolling machine, wrapping the unrolled uncooked bleached cotton yarn by a plastic film, and rotationally stacking, wherein the stacking temperature is 35 ℃, the stacking time is 8h, and the rotating speed is 5 r/min;
s4, washing: and (4) soaping, hot water washing, cold water washing and drying the uncooked and bleached cotton yarn processed in the step S3 to obtain a finished product.
On the basis of example 1, considering the influence of the volume ratio of ethanol to water in the dye liquor on the K/S value of the unbleached cotton yarn, under the condition that other conditions are not changed, the change rule of the K/S value of the unbleached cotton yarn is examined by changing the volume ratio of the ethanol to the water in the dye liquor, and examples 1 to 5 are shown in Table 1.
Table 1:
as can be seen from Table 1, the K/S value of the uncooked and bleached cotton yarn tends to increase and decrease with the increase of the volume fraction of ethanol, mainly because the volume fraction of water decreases correspondingly with the increase of the volume fraction of ethanol, the dye is easier to disperse in the dye solution and is less prone to aggregation, and the polarity of the mixed solution decreases with the increase of the volume fraction of ethanol, thereby accelerating the formation of covalent bonds between the dye and cellulose, accelerating the diffusion rate of dye molecules into fibers, further increasing the K/S value of the uncooked and bleached cotton yarn, and when the volume fraction of ethanol continues to increase, the polarity between molecules is reduced due to the decrease of the concentration of the dye between the dye solution and the air interface, on one hand, the diffusion rate of dye molecules into fibers is accelerated, and on the other hand, the diffusion rate of dye molecules is inhibited due to the continuous decrease of concentration, therefore, the K/S value of the un-boiled and bleached cotton yarn is reduced, and the K/S value of the un-boiled and bleached cotton yarn is better when the volume ratio of ethanol to water in the dye liquor is 80 percent to 20 percent to 95 percent to 5 percent.
Examples 6 to 10
On the basis of the embodiment 1, the volume ratio of ethanol to water in the dye solution is 85% to 15%, the concentration of the reactive dye in the dye solution is 15g/L, the alkaline substance is sodium carbonate, the concentration of the sodium carbonate is 20-40 g/L, the padding dye solution is padded for 17s at the temperature of 27 ℃, the bath ratio is 1:25, the rolling residual rate of the un-boiled and unbleached cotton sliver after padding the dye solution is 90%, the rolling and stacking conditions are that the stacking temperature is 30 ℃, the stacking time is 16h, and the rotating speed is 7 r/min.
Considering the influence of the concentration of the alkaline substance in the dye liquor on the fixation rate, the change rule of the fixation rate of the un-boiled and bleached cotton slivers is examined by changing the concentration of the alkaline substance under the condition that other conditions are not changed, and examples 6 to 10 are shown in the table 2.
Table 2:
as can be seen from Table 2, with the increase of the concentration of the alkaline substance sodium carbonate, the fixation rate of the un-boiled and unbleached cotton sliver shows the trend of increasing firstly and then slowly decreasing, this is mainly because as the concentration of sodium carbonate increases, hydroxyl groups in the un-bleached sliver can gradually lose protons to convert into nucleophiles under the action of sodium carbonate, and the inside of the un-boiled and bleached cotton sliver gradually expands to loosen the fiber structure, reduce the electrostatic repulsion force between the dye and the un-boiled and bleached cotton sliver and promote the uniform dyeing of the dye on the surface and inside of the un-boiled and bleached cotton sliver, thereby not only obtaining higher fixation rate, but also avoiding the phenomenon of uneven dyeing, as the concentration of the sodium carbonate is continuously increased, the part of the reactive dye is hydrolyzed under the action of the sodium carbonate, and further the color fixing rate is reduced, so that when the concentration of sodium carbonate is 25-35g/L, the color fixing rate effect of the un-boiled and bleached cotton sliver is better.
Examples 11 to 15
On the basis of example 1, wherein the volume ratio of ethanol to water in the dye solution is 95% to 5%, the concentration of the reactive dye in the dye solution is 25g/L, the alkaline substance is sodium bicarbonate, the concentration of the sodium bicarbonate is 30g/L, the padding dye solution is padded for 25s at the temperature of 20-35 ℃, the bath ratio is 1:30, the rolling residual rate of the uncooked and bleached cotton slivers after padding the dye solution is 100%, the rolling and stacking conditions are that the stacking temperature is 30 ℃, the stacking time is 8h, and the rotating speed is 10 r/min.
Considering the influence of the temperature of the padding liquor on the fixation ratio, the law of change of fixation ratio of un-boiled and bleached cotton slivers was examined by changing the padding temperature under otherwise unchanged conditions, examples 11-15, as shown in table 3.
Table 3:
as can be seen from table 3, with the increase of the padding temperature, the color fixing rate of the uncooked and bleached cotton sliver tends to increase and then decrease gradually, which is mainly because the increase of the padding temperature can promote the speed of the reactive dye to dye the uncooked and bleached cotton sliver, so as to improve the color fixing rate, but with the continuous increase of the padding temperature, the dyeing speed is further increased, which easily causes the phenomenon of uneven dyeing, and therefore, when the padding temperature is 25-30 ℃, the color fixing rate of the uncooked and bleached cotton sliver is higher.
Examples 16 to 20
On the basis of example 1, wherein the volume ratio of ethanol to water in the dye solution is 90% to 10%, the concentration of the reactive dye in the dye solution is 20g/L, the alkaline substance is sodium carbonate, the concentration of the sodium carbonate is 35g/L, the padding dye solution is padded for 25s at the temperature of 30 ℃, the bath ratio is 1:25, the rolling residual rate of the un-boiled and unbleached cotton sliver after padding the dye solution is 50-140%, the rolling and stacking conditions are that the stacking temperature is 30 ℃, the stacking time is 16h, and the rotating speed is 10 r/min.
Considering the influence of the rolling residue rate of the un-bleached cotton sliver after padding the dye liquor on the color fixing rate, under the condition that other conditions are not changed, the change rule of the color fixing rate of the un-bleached cotton sliver is examined by changing the rolling residue rate of the un-bleached cotton sliver after padding the dye liquor, and examples 16 to 20 are shown in table 4.
Table 4:
as can be seen from table 4, the color fixing rate tends to increase and decrease gradually as the percentage of the un-bleached sliver after padding the dye liquor increases, mainly because the concentration of the dye liquor decreases as the percentage of the un-bleached sliver after padding the dye liquor increases, and further the speed of dyeing the un-bleached sliver with the reactive dye decreases, although the requirement of dyeing uniformity can be met to a certain extent, the color fixing rate of the un-bleached sliver decreases, when the percentage of the padding is low, the concentration of the dye liquor is high, the dyeing speed is fast, and therefore the color fixing rate is high, but as the concentration of the dye liquor continues to increase, the dyeing speed continues to increase, and the phenomenon of uneven dyeing is easily caused, and therefore, when the percentage of the padding is 70-120%, the color fixing rate of the un-bleached sliver is high.
Examples 21 to 25
On the basis of example 1, wherein the volume ratio of ethanol to water in the dye solution is 95% to 5%, the concentration of the reactive dye in the dye solution is 20g/L, the alkaline substance is sodium carbonate, the concentration of the sodium carbonate is 30g/L, the padding dye solution is padded for 30s at the temperature of 25 ℃, the bath ratio is 1:30, the rolling residual rate of the un-boiled and unbleached cotton sliver after padding the dye solution is 100%, the rolling and stacking conditions are that the stacking temperature is 20-40 ℃, the stacking time is 16h, and the rotating speed is 7 r/min.
Considering the influence of the stacking temperature of the rolled stack on the fixation rate, the change rule of the fixation rate of the un-boiled and bleached cotton yarn was examined by changing the stacking temperature of the rolled stack under the condition that other conditions are not changed, and examples 21 to 25 are shown in Table 5.
Table 5:
it can be seen from table 5 that, as the stacking temperature of the rolling stack increases, the K/S value and the fixation rate of the uncooked and bleached cotton yarn tend to increase and decrease, mainly because the dye-uptake rate of the dye increases with the increase of the stacking temperature, the attraction of the uncooked and bleached cotton yarn to the dye gradually increases, and further the K/S value and the fixation rate of the uncooked and bleached cotton yarn are improved, and as the stacking temperature continues to increase, the dye-uptake rate at the initial stage of dyeing is easy to be too high, the adsorption reaction of the dye is completed in a short time, and the too high dye-uptake rate causes uneven color depth, so that when the stacking temperature of the rolling stack is 25-35 ℃, the fixation rate and the K/S value of the uncooked and bleached cotton yarn are superior.
Examples 26 to 30
On the basis of the embodiment 1, the volume ratio of ethanol to water in the dye solution is 80% to 20%, the concentration of the reactive dye in the dye solution is 15g/L, the concentration of the alkaline substance is sodium hydroxide, the concentration of the sodium hydroxide is 25g/L, the padding dye solution is padded for 25s at the temperature of 25 ℃, the bath ratio is 1:25, the rolling residual rate of the un-boiled and unbleached cotton sliver after padding the dye solution is 120%, the rolling and stacking conditions are that the stacking temperature is 30 ℃, the stacking time is 6-26h, and the rotating speed is 7 r/min.
Considering the influence of the stacking time of the rolled stack on the fixation rate, the law of the fixation rate of the un-boiled and bleached cotton yarns was examined by changing the stacking time of the rolled stack under the condition of keeping other conditions unchanged, examples 26 to 30 are shown in Table 6.
Table 6:
as can be seen from table 6, as the stacking time of the rolling and stacking is increased, the K/S value and the fixation rate of the uncooked and bleached cotton yarn tend to be balanced after increasing, which is mainly because the dye uptake rate of the dye is increased along with the increase of the stacking time, the attraction of the uncooked and bleached cotton yarn to the dye is gradually increased, so that the K/S value and the fixation rate of the uncooked and bleached cotton yarn are improved, the dyeing is basically finished along with the continuous increase of the stacking time, and as the time goes on, although the K/S value and the fixation rate of the uncooked and bleached cotton yarn are not obviously changed, the dyeing speed may be non-uniform, so that the dyeing color depth is non-uniform, and therefore, when the stacking time of the rolling and stacking is 8-24 h, the fixation rate and the K/S value of the uncooked and bleached cotton yarn are better.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A salt-free cold pad-batch dyeing method for uncooked bleached cotton fibers is characterized by comprising the following steps:
s1, preparing a dye solution: putting the reactive dye and the alkaline substance into a mixed solution of an alcohol organic solvent-water system, and stirring uniformly to prepare a dye solution;
s2, padding a dye solution: placing the uncooked and bleached cotton fiber in a prepared dye solution for padding;
s3, rolling and stacking: rolling the uncooked bleached cotton fiber dyed in the step S2 on a rolling machine, and wrapping the rolled uncooked bleached cotton fiber by a plastic film and then rotationally stacking; in the step S3, the stacking temperature is 25-35 ℃, the stacking time is 8-24 h, and the rotating speed is 5-10 r/min;
s4, washing: soaping, hot water washing, cold water washing and drying the uncooked and bleached cotton fiber treated in the step S3 to obtain a finished product;
in step S1, the alkaline substance is one of sodium carbonate, sodium bicarbonate and sodium hydroxide;
the alcohol organic solvent is ethanol.
2. The salt-free cold pad-batch dyeing method of uncooked and bleached cotton fiber as claimed in claim 1, wherein in step S1, the volume ratio of the alcohol organic solvent to water in the dyeing solution is 80%: 20%: 95%: 5%.
3. The salt-free cold pad-batch dyeing method of the uncooked and bleached cotton fiber according to claim 1, wherein in the step S1, the concentration of the reactive dye in the dyeing solution is 5-25 g/L, and the concentration of the alkaline substance is 25-35 g/L.
4. The salt-free cold pad-batch dyeing method of the uncooked and bleached cotton fiber according to claim 1, wherein in the step S2, the padding dye liquor is padded for 5-30S at a bath ratio of 1: 20-30 under the condition of a temperature of 25-30 ℃.
5. The method for dyeing unsaponifiable cotton fibers with cold pad-batch processes according to claim 1 or 4, wherein in step S2, the padding mode is two-padding and two-padding.
6. The salt-free cold pad-batch dyeing method for the unbleached cotton fiber according to claim 1, characterized in that the mangle residue of the unbleached cotton fiber after the padding of the dye liquor in the step S2 is 70-120%.
7. The salt-free cold pad-batch dyeing method of the uncooked and bleached cotton fiber according to claim 1, wherein the uncooked and bleached cotton fiber is one of uncooked and bleached cotton loose fiber, uncooked and bleached cotton yarn or uncooked and bleached cotton sliver.
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