CN111395016A - Dyeing process for elastic cotton cone yarn - Google Patents
Dyeing process for elastic cotton cone yarn Download PDFInfo
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- CN111395016A CN111395016A CN202010296182.7A CN202010296182A CN111395016A CN 111395016 A CN111395016 A CN 111395016A CN 202010296182 A CN202010296182 A CN 202010296182A CN 111395016 A CN111395016 A CN 111395016A
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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
- D06P1/44—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 insoluble pigments or auxiliary substances, e.g. binders
- D06P1/445—Use of auxiliary substances before, during or after dyeing or printing
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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
- D06P1/44—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 insoluble pigments or auxiliary substances, e.g. binders
- D06P1/673—Inorganic compounds
- D06P1/67333—Salts or hydroxides
- D06P1/6735—Salts or hydroxides of alkaline or alkaline-earth metals with anions different from those provided for in D06P1/67341
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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
- D06P3/82—Textiles which contain different kinds of fibres
- D06P3/8204—Textiles which contain different kinds of fibres fibres of different chemical nature
- D06P3/8219—Textiles which contain different kinds of fibres fibres of different chemical nature mixtures of fibres containing hydroxyl and amide groups
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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
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/02—After-treatment
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Abstract
An elastic cotton cheese dyeing process belongs to the technical field of cheese dyeing and sequentially comprises the following steps of 1) hot water washing, 2) cold water washing, 3) dyeing, 4) acid washing, 5) soaping, 6) water washing and 7) drying, 1) hot water washing, adding water, heating to 85-90 ℃ at the speed of 1-2 ℃/min, washing for 15-20 minutes, discharging liquid, 3) dyeing, maintaining the water temperature at 38-42 ℃, sequentially adding a leveling agent, a reactive dye and sodium sulfate, heating to 58-62 ℃, adding sodium carbonate, keeping the temperature for 75-85 minutes, discharging liquid, 5) soaping, adding 1-3 g/L soaping agent, heating to 85-90 ℃ at the speed of 1-2 ℃/min, washing for 15-20 minutes, discharging liquid, 7) drying, dehydrating the elastic cotton cheese, drying to 3-4% at the temperature of 60-90 ℃, and drying the elastic yarn after dyeing by the process disclosed by the invention has good elasticity and almost no difference in elastic elongation rate before and after dyeing.
Description
Technical Field
An elastic cotton cheese dyeing process belongs to the technical field of cheese dyeing.
Background
The elastic cotton yarn is formed by taking spandex filaments as a core and spirally wrapping the stretched spandex filaments by pure cotton filament yarns or short fiber yarns. The elastic cotton yarn only provides elasticity by the central spandex yarn, and after weaving, a fabric with high cotton content and elasticity can be obtained, so that the elastic cotton yarn is particularly suitable for manufacturing sweat-absorbing high-elasticity underwear. The cheese dyeing is that the yarn is wound on a tube core with holes to form cone-shaped cheese, which is respectively fixed on a special cage and then is put into a special closed dye vat, and a pump is used to make the dye liquor flow circularly from the inside of the tube core to the outside of the tube core (forward direction) or from the outside of the tube core to the inside of the tube core (reverse direction) among the online gaps, so as to obtain uniform dyeing effect.
The existing industrial production mode mostly adopts the customer to provide yarn and indexes, and the factory receives orders, dyes and delivers. The indexes provided by customers mainly comprise cloth samples or color cards, color fastness, uniformity and elastic elongation of dyed yarns. If the indexes of the product do not reach the standards during delivery, the factory faces the problems of refusing payment, reducing price and making a deal, and even compensating the loss of the yarn of the client. Cheese dyeing is an efficient dyeing method and is widely applied to dyeing of inelastic yarns. However, in dyeing stretch cotton yarn, the applicant has found that the following problems exist:
firstly, the dyed elastic cotton yarn is easy to have the problem of obvious reduction of elasticity, the difference of the elastic recovery rate of the yarn before and after dyeing is large, the function of the yarn as the elastic yarn is lost, and the requirement of a client is difficult to achieve; the spandex + other elastic chemical fibers + cotton are adopted to make the elastic yarn in the prior art, other elastic chemical fibers can be used as a core and can also be used as external wrapping yarns, the elasticity is provided through the compounding of two fibers of the spandex + other elastic chemical fibers, the elastic yarn is prevented from losing the elasticity more easily in the dyeing process, and the cotton content of the yarn can be reduced. At present, natural plant fibers and fabrics with high cotton content are more and more favored by the market, but the problem of losing elasticity is easy to occur after the fabrics are dyed by elastic yarns of cotton and spandex.
Secondly, in the existing cheese dyeing method, the obtained elastic cotton yarn has the phenomenon of uneven dyeing, and on one cheese, the yarns at two ends close to the tube core and the yarns at the middle section have dark colors, while the yarns at the middle section have light colors, so that when the yarns with the problems are adopted for weaving, the obtained fabric has the phenomenon of obvious uneven colors.
Thirdly, the color fastness of the elastic cotton yarn obtained by the existing cheese dyeing method is not ideal. Most of fabrics woven by the elastic cotton yarns are worn next to the skin and are often washed, so that the requirements on various fastness indexes are high, but the fastness performance of the existing method is not ideal.
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the elastic cotton cone yarn dyeing process is provided, the elastic yarn dyed by the process has good elasticity, and the elastic elongation of the yarn before and after dyeing is almost the same.
The technical scheme adopted by the invention for solving the technical problems is as follows: the dyeing process of the elastic cotton cone yarn comprises the following steps:
1) hot water washing-2) cold water washing-3) dyeing-4) acid washing-5) soaping-6) water washing-7) drying;
wherein:
1) hot water washing: putting the elastic cotton cheese into a dye vat, adding water, heating to 85-90 ℃ at the speed of 1-2 ℃/min, washing for 15-20 min, and discharging liquid;
3) dyeing: adding water into a dye vat, maintaining the water temperature at 38-42 ℃, and sequentially adding a leveling agent, a reactive dye and anhydrous sodium sulphate; heating to the water temperature of 58-62 ℃, adding sodium carbonate, performing heat preservation and dyeing for 75-85 minutes, and discharging liquid;
5) soaping, namely adding water into the dye vat, adding 1-3 g/L soaping agent, heating to 85-90 ℃ at the speed of 1-2 ℃/min, washing for 15-20 min, and discharging liquor;
7) drying: and (3) dehydrating the elastic cotton cheese, and drying at 60-90 ℃ until the moisture content of the elastic cotton cheese is 3-4%.
0.5-2 g/L of penetrant is also added in the step 1).
The penetrating agent is a penetrating agent WX-3301.
The density of the stretch cotton cheese in the step 1)0.26~0.3g/cm3And the net weight of the yarns on each cheese is 800-850 g.
The specific operation of the step 2) cold water washing is as follows: adding water into the dye vat, washing for 5-10 minutes at 20-30 ℃, and discharging liquid; the concrete operation of the step 6) cold water washing is as follows: adding water into the dye vat, washing for 5-10 minutes at 20-30 ℃, and discharging liquid.
And 6) washing with cold water for 1-3 times.
The pickling in the step 4) comprises the following specific operations: adding water into a dye vat, adding weak acid to adjust the pH value to be neutral, washing for 8-15 minutes at 20-30 ℃, and discharging liquid.
The specific operation of the step 3) is that water is added into a dye vat to maintain the water temperature at 40 ℃, a leveling agent is added at first for 0.8-1.2 g/L, the temperature is maintained for 8-10 minutes, a reactive dye is added at first for 0.5-8% (owf), the temperature is maintained for 8-10 minutes, anhydrous sodium sulfate is added at first for 75-85 g/L, the temperature is maintained for 8-10 minutes, the temperature is raised to 60 ℃ at the speed of 1 ℃/minute, sodium carbonate is added at first for 18-23 g/L, the temperature of the dye liquor in the dye vat is maintained for 60 ℃, the dye liquor is maintained for 75-85 minutes, and the liquor is drained.
The leveling agent is a leveling agent FR-301.
And 7), drying at 85-90 ℃.
The present invention is described in detail as follows:
the cycle of step 3) refers to: the water flow in the dye vat flows in a positive and negative alternate circulation mode. The water flow in the specific dye vat is positively circulated for 2 minutes and then reversely circulated for 2 minutes, and the circulation mode is repeated.
The reactive dye in the step 3) is a conventional series, a super series, a medium-dark series, a very-dark series or a light-color series of the reactive dye of Zhejiang leata GmbH.
Preferably, the weak acid in step 4) is acetic acid.
Step 6) cold water washing: the method comprises the following steps of adding water into a dye vat, washing for 5-10 minutes at 20-30 ℃, discharging liquor for 1 time, and performing operation for 1 time when dyeing a light color and 2-3 times when dyeing a dark color.
And 7) drying by adopting radio frequency drying or/and hot air drying. The radio frequency dryer or the hot air dryer with the temperature control function can be adopted, or a continuous dryer unit containing both the radio frequency dryer and the hot air dryer can be adopted.
In the prior art, in order to improve the pilling resistance and wear resistance of the yarn, other chemical fibers, such as chinlon, besides spandex are often mixed in the outer layer yarn of the elastic core-spun yarn. In the prior art, the mixed yarn of the central spandex wrapped with cotton fiber and chinlon can be boiled in water at 100 ℃ for a long time during dyeing. However, the applicant finds that the mixed yarn is easy to have the problem of impaired wearability after subsequent weaving of ready-made clothes; customers reflect that the tested elastic elongation is better when delivering, but the manufactured underwear is easy to lose shape and becomes not close to the skin. The applicant researches the problem and finds that the problem is caused by high-temperature loss of spandex in the center; because the chinlon spirally coated outside the spandex has elasticity, the mixed yarn still has better elasticity performance after being dyed, but the central spandex has the problem of elasticity damage; after the fabric is woven into clothes, a close-fitting high-elastic network is difficult to form; after a while, the loss of spandex is more obvious, and finally the shape of the clothes is deformed. In order to solve the problems found above, the applicant carries out temperature control on a long-time high-temperature washing step in steps 1) and 5), and designs the requirements of temperature rise rate and water content after drying so as to avoid the damage of high temperature, rapid temperature rise and rapid dehydration on the elasticity of spandex.
A penetrating agent can be further added in the step 1), and preferably, the penetrating agent is a penetrating agent WX-3301, Zibofeng sanderian Limited; the addition of the penetrating agent can improve the color-obtaining capability of the yarn and the dye-uptake. Particularly, when the fabric is dyed in dark color, the effect of adding the penetrating agent is better.
Preferably, the specific operation of adding sodium carbonate in step 3) is to add sodium carbonate within 5 minutes after the temperature is raised to 60 ℃.
And 7) dehydrating by adopting a cheese centrifugal dehydrator. The moisture content of the dehydrated cheese is lower than 45 percent, so that the drying time can be effectively shortened.
The flowing mode of water flow in the steps 1) -2) and 4) -6), and the heat preservation dyeing specific operation in the step 3) are as follows: the water flow is circulated in the positive direction for 4 minutesReversely circulating for 3 minutes and repeating; pressure in the dye vat: 1.8-2 kg/cm in the cylinder21.85-2.1 kg/cm outside the bobbin2(ii) a Flow rate of water in dye vat: 0.5 to 1 m/s.
Compared with the prior art, the dyeing process of the elastic cotton cheese has the beneficial effects that:
1. the elastic yarn obtained by the dyeing process of the elastic cotton cone yarn has good elasticity performance, the elastic elongation of the yarn before and after dyeing is almost the same, and the elastic loss caused by the dyeing process is avoided. Firstly, the elastic yarn is made of all-cotton covered spandex, and only one bundle of spandex is used for providing elastic force, so that the elastic yarn obviously loses the elasticity if the elastic force is reduced, and therefore, the elastic cotton is easy to fall apart and deform after long-term use, cannot resist high temperature, and is easy to damage when the temperature is too high. The applicant designs and adjusts the temperature of the steps of 1) hot water washing, 5) soaping and 7) drying to be 60-90 ℃, and designs the heating rate of the steps so as to avoid the influence of high temperature and rapid heating on the elasticity of spandex. Secondly, when the moisture content of the elastic cotton cheese is too low, the spandex is excessively dehydrated, so that the brittleness and the elasticity of the spandex are increased; therefore, the applicant limits the moisture content of the elastic cotton cheese dried in the step 7) to be 3-4% so as to avoid influence on elasticity of the elastic yarn due to excessive drying. Finally, the applicant finds that spandex has the characteristic of no alkali resistance, and particularly under the high-temperature condition of more than 90 ℃, the spandex elasticity is obviously damaged by alkalinity, so that the pH value of cheese dyed in the step 3) is adjusted to be neutral by acid washing, and the spandex elasticity can be effectively prevented from being damaged by the high temperature in the subsequent step 5) of soaping.
2. The dyeing process of the elastic cotton cheese solves the problems of uneven dyeing and low color fastness of the elastic yarn on each bobbin. Firstly, the density of the elastic cotton cheese is 0.26-0.3 g/cm3The net weight of the yarns is 800-850 g per bobbin, so that each cheese is soft and thin, and the dyeing is facilitated to be thorough and uniform; from the dyeing pretreatment temperature, the temperature is controlled at 90 ℃, the elasticity of the elastic cotton is kept, and the excessive shrinkage of the cheese is avoided, so that the dye liquor is easier to circularly dye thoroughly during dyeing. Secondly, because the spandex is heated and contracted after being heated, the cheese is tight and the dye is not easy to permeate, 40 ℃ is selectedAdding a leveling agent, a reactive dye and anhydrous sodium sulphate at low temperature; when the temperature is too high, the cheese is easy to shrink by heating, so that uneven dyeing is caused, and when the temperature is too low, the leveling agent, the reactive dye and the anhydrous sodium sulphate cannot be quickly and fully dissolved. Firstly, adding a leveling agent to improve the uniform diffusion capacity of the dye in water and on the fiber; then adding reactive dye to realize the uniform dispersion of the reactive dye in the dye vat; and finally, adding anhydrous sodium sulphate to improve the dye uptake of the dye on the fiber. Thirdly, the applicant finds that sodium carbonate is not easy to add before the temperature rise, because the anhydrous sodium sulphate has an effect process with the fiber when promoting the dyeing, enough effect time and effect temperature are needed, the reaction time is too short at 40 ℃, the internal and external dyeing rates of the cheese are different, and after the temperature rise is carried out at 40-60 ℃, the dyeing rate can be further improved, and the difference between the internal and external dyeing rates of the cheese is reduced and eliminated. The too early addition of sodium carbonate before the temperature rise can lead to the color fixation in advance, not only influence the dye uptake, but also lead to the serious color difference inside and outside the cheese. Based on the above findings, the applicant has devised the addition of sodium carbonate after warming to 60 ℃ to improve the fastness to dyeing and level-dyeing properties.
Detailed Description
Examples 1-6 are specific examples of the dyeing process for the spandex cheese of the invention, wherein example 1 is the best mode.
The yarns used were: jiangsu Tianhong textile group Limited, 16+40D (outer layer: 16 count, core 40D spandex) raw yarn strength 410CN, twist 72/CM.;
penetrant: zibofeng Cheng textile Co., Ltd, type penetrant WX-3301;
leveling agent: zibofeng Cheng textile Co., Ltd, model number leveling agent FR-301;
soaping agent: zibofeng Cheng textile Co., Ltd, model number soaping agent tx-102;
sodium sulfate and sodium carbonate: traded, ltd, hanzhong; acetic acid: 99% of the chemical industry ltd, denn hong bridge;
active dye Zhejiang lea soil GmbH, conventional series of active dyes (active golden RNN), super series (active super red RW, active super black GN), middle and deep color series (active dark BF), extreme dark series (active black RHR), and light color series (active gray R L);
dyeing machine: high temperature and high pressure dyeing machine model GS241H-10, high temperature and high pressure group Limited company;
STA L AM, Strateham radio frequency dryer model number RF85 kw;
a hot air dryer: south Tong Dong Geng machine, tunnel type cheese dryer DGHY.
Example 1
The dyeing process comprises the following steps:
1) hot water washing, namely putting the elastic cotton cheese into a dye vat, adding water of 30 ℃ and penetrating agent of 2 g/L, heating to the water temperature of 90 ℃ at the speed of 1 ℃/minute, washing for 15 minutes, discharging liquid, wherein the density of the elastic cotton cheese is 0.26g/cm3The net weight of the yarn is 800 g/cylinder;
2) and (3) cold water washing: adding water into a dye vat, washing for 10 minutes at 30 ℃, and discharging liquor;
3) dyeing, namely adding water into a dye vat, maintaining the water temperature at 40 ℃, adding 1.2 g/L of a leveling agent, circulating for 10 minutes at 40 ℃, adding 8 percent of active black RHR (owf), circulating for 10 minutes at 40 ℃, adding 80 g/L of anhydrous sodium sulphate, circulating for 10 minutes at 40 ℃, heating the dye solution in the dye vat to 60 ℃ at the speed of 1 ℃/minute, adding 20 g/L of sodium carbonate after heating for 2 minutes, maintaining the temperature of the dye solution at 60 ℃, circularly dyeing for 80 minutes, and discharging the liquid;
4) acid washing: adding water into a dye vat, adding weak acid to adjust the pH value to be neutral, washing for 10 minutes at 30 ℃, and discharging liquid;
5) soaping, namely adding water with the temperature of 30 ℃ into a dye vat, adding 2 g/L soaping agent, raising the temperature to 85 ℃ at the speed of 1 ℃/minute, washing for 15 minutes, and discharging liquor;
6) washing with water: the cold water washing operation comprises the following steps: adding water into a dye vat, washing for 10 minutes at 30 ℃, and discharging liquor; then repeating the step 6) for 2 times;
7) drying: and (3) dehydrating the elastic cotton cheese, drying by hot air at 80 ℃ until the moisture content of the elastic cotton cheese is 3.9%.
Example 2
1) Hot water washing: the elastic cotton canPutting the yarn into a dye vat, adding water of 20 ℃ and penetrating agent of 1.5 g/L, heating to 88 ℃ at the speed of 2 ℃/min, washing for 15 min, discharging liquid, wherein the density of the elastic cotton cheese is 0.28g/cm3The net weight of the yarn is 830 g/cylinder;
2) and (3) cold water washing: adding water into a dye vat, washing for 5 minutes at 20 ℃, and discharging liquor;
3) dyeing, namely adding water into a dye vat, maintaining the water temperature at 40 ℃, adding 1.1 g/L of a leveling agent, circulating for 10 minutes at 40 ℃, adding 7.2 percent of active super black GN, circulating for 10 minutes at 40 ℃, adding 80 g/L of anhydrous sodium sulphate, circulating for 10 minutes at 40 ℃, then heating the dye solution in the dye vat to 60 ℃ at the speed of 1 ℃/minute, adding 20 g/L of sodium carbonate after heating for 3 minutes, maintaining the temperature of the dye solution at 60 ℃, circularly dyeing for 80 minutes, and discharging the liquid;
4) acid washing: adding water into a dye vat, adding weak acid to adjust the pH value to be neutral, washing for 15 minutes at 20 ℃, and discharging liquid;
5) soaping, namely adding water with the temperature of 20 ℃ into a dye vat, adding 3 g/L soaping agent, raising the temperature to 88 ℃ at the speed of 2 ℃/min, washing for 15 min, and discharging liquor;
6) washing with water: the cold water washing operation comprises the following steps: adding water into a dye vat, washing for 8 minutes at 20 ℃, and discharging liquor; then repeating the step 6) for 2 times;
7) drying: and (3) dehydrating the elastic cotton cheese, drying by hot air at 70 ℃ until the moisture content of the elastic cotton cheese is 3.7%.
Example 3
1) Hot water washing, namely putting the elastic cotton cheese into a dye vat, adding 25 ℃ water and 1 g/L of penetrant, heating to 87 ℃ at the speed of 1 ℃/minute, washing for 15 minutes, discharging liquid, wherein the density of the elastic cotton cheese is 0.7g/cm3The net weight of the yarn is 800 g/cylinder;
2) and (3) cold water washing: adding water into a dye vat, washing for 10 minutes at 25 ℃, and discharging liquor;
3) dyeing, namely adding water into a dye vat, maintaining the water temperature at 40 ℃, adding 1 g/L of a leveling agent, circulating for 10 minutes at 40 ℃, adding 2 percent (owf) of active navy blue, circulating for 10 minutes at 40 ℃, adding 78 g/L of anhydrous sodium sulphate, circulating for 9 minutes at 40 ℃, then heating the dye solution in the dye vat to 60 ℃ at the speed of 1 ℃/minute, adding 20 g/L of sodium carbonate after heating for 4 minutes, maintaining the temperature of the dye solution at 60 ℃, circularly dyeing for 80 minutes, and discharging the liquid;
4) acid washing: adding water into a dye vat, adding weak acid to adjust the pH value to be neutral, washing for 10 minutes at 30 ℃, and discharging liquid;
5) soaping, namely adding water with the temperature of 25 ℃ into a dye vat, adding 1.5 g/L soaping agent, heating to the water temperature of 90 ℃ at the speed of 1.5 ℃/minute, washing for 20 minutes, and discharging liquor;
6) washing with water: the cold water washing operation comprises the following steps: adding water into a dye vat, washing for 5 minutes at 25 ℃, and discharging liquor; then repeating the step 6) for 2 times;
7) drying: and (3) dehydrating the elastic cotton cheese, drying by hot air at 60 ℃ until the moisture content of the elastic cotton cheese is 3.0%.
Example 4
1) Hot water washing, namely putting the elastic cotton cheese into a dye vat, adding water at 20 ℃ and 0.5 g/L of penetrant, heating to 85 ℃ at the speed of 1.5 ℃/min, washing for 20 min, discharging liquid, wherein the density of the elastic cotton cheese is 0.3g/cm3The net weight of the yarn is 800 g/cylinder;
2) and (3) cold water washing: adding water into a dye vat, washing for 5 minutes at 20 ℃, and discharging liquor;
3) dyeing, namely adding water into a dye vat to maintain the water temperature at 40 ℃, adding a leveling agent of 0.9 g/L, circulating for 9 minutes at 40 ℃, adding reactive super red RW of 1.2 percent (owf), circulating for 10 minutes at 40 ℃, adding anhydrous sodium sulphate of 82 g/L, circulating for 8 minutes at 40 ℃, then heating the dye solution in the dye vat to 60 ℃ at the speed of 1 ℃/minute, adding sodium carbonate of 21 g/L after heating for 5 minutes, maintaining the temperature of the dye solution at 60 ℃, circularly dyeing for 80 minutes, and discharging the liquid;
4) acid washing: adding water into a dye vat, adding weak acid to adjust the pH value to be neutral, washing for 15 minutes at 20 ℃, and discharging liquid;
5) soaping, namely adding water with the temperature of 20 ℃ into a dye vat, adding 1 g/L soaping agent, heating to the water temperature of 90 ℃ at the speed of 2 ℃/min, washing for 15 min, and discharging liquor;
6) washing with water: the cold water washing operation comprises the following steps: adding water into a dye vat, washing for 10 minutes at 20 ℃, and discharging liquor; then repeating the step 6) for 1 time;
7) drying: and (3) dehydrating the elastic cotton cheese, drying at 90 ℃ by radio frequency until the moisture content of the elastic cotton cheese is 3.2%.
Example 5
1) Hot water washing: putting the elastic cotton cheese into a dye vat, adding 30 ℃ water, heating to 90 ℃ at the speed of 2 ℃/min, washing for 15 min, and discharging liquid; the density of the elastic cotton cheese is 0.3g/cm3The net weight of the yarn is 850 g/cylinder;
2) and (3) cold water washing: adding water into a dye vat, washing for 10 minutes at 30 ℃, and discharging liquor;
3) dyeing, namely adding water into a dye vat, maintaining the water temperature at 40 ℃, adding 0.9 g/L leveling agent, circulating for 8 minutes at 40 ℃, adding R L1% (owf) active ash, circulating for 9 minutes at 40 ℃, adding 78 g/L anhydrous sodium sulfate, circulating for 10 minutes at 40 ℃, heating the dye solution in the dye vat to 60 ℃ at the speed of 1 ℃/minute, adding 18-23 g/L of sodium carbonate after heating for 1 minute, maintaining the temperature of the dye solution at 60 ℃, circularly dyeing for 80 minutes, and discharging the liquid;
4) acid washing: adding water into a dye vat, adding weak acid to adjust the pH value to be neutral, washing for 10 minutes at 30 ℃, and discharging liquid;
5) soaping, namely adding water with the temperature of 30 ℃ into a dye vat, adding 1 g/L soaping agent, heating to the water temperature of 85 ℃ at the speed of 1 ℃/minute, washing for 20 minutes, and discharging liquor;
6) washing with water: the cold water washing operation comprises the following steps: adding water into a dye vat, washing for 10 minutes at 30 ℃, and discharging liquor;
7) drying: and (3) dehydrating the elastic cotton cheese, drying at 90 ℃ by radio frequency until the moisture content of the elastic cotton cheese is 4.0%.
Example 6
1) Hot water washing: putting the elastic cotton cheese into a dye vat, adding 25 ℃ water, heating to 90 ℃ at the speed of 2 ℃/min, washing for 20 min, and discharging liquid; the density of the elastic cotton cheese is 0.28g/cm3The net weight of the yarn is 850 g/cylinder;
2) and (3) cold water washing: adding water into a dye vat, washing for 10 minutes at 25 ℃, and discharging liquor;
3) dyeing, namely adding water into a dye vat, maintaining the water temperature at 40 ℃, adding 0.8 g/L leveling agent, circulating for 8 minutes at 40 ℃, adding 0.5 percent (owf) of active golden yellow RNN, circulating for 10 minutes at 40 ℃, adding 75 g/L of anhydrous sodium sulphate, circulating for 8 minutes at 40 ℃, then heating the dye solution in the dye vat to 60 ℃ at the speed of 1 ℃/minute, adding 18 g/L of sodium carbonate within 3 minutes after heating, maintaining the temperature of the dye solution at 60 ℃, circularly dyeing for 80 minutes, and discharging liquor;
4) acid washing: adding water into a dye vat, adding weak acid to adjust the pH value to be neutral, washing for 8 minutes at 25 ℃, and discharging liquid;
5) soaping, namely adding water with the temperature of 25 ℃ into a dye vat, adding 1 g/L soaping agent, raising the temperature to 88 ℃ at the speed of 2 ℃/min, washing for 15 min, and discharging liquor;
6) washing with water: the cold water washing operation comprises the following steps: adding water into a dye vat, washing for 10 minutes at 25 ℃, and discharging liquor;
7) drying: and (3) dehydrating the elastic cotton cheese, drying by hot air at 80 ℃ until the moisture content of the elastic cotton cheese is 3.2%.
Comparative example 1
The yarns, cone densities, dry weights and processes of this comparative example were the same as example 1 except that:
1) and (3) hot water washing, namely putting the elastic cotton cheese into a dye vat, adding water with the temperature of 20-30 ℃ and 2 g/L of penetrant, heating to the water temperature of 100 ℃ at the speed of 1 ℃/minute, washing for 15 minutes, and discharging liquid.
Comparative example 2
The yarns, cone densities, dry weights and processes of this comparative example were the same as example 1 except that:
5) soaping, namely adding water with the temperature of 30 ℃ into a dye vat, adding 2 g/L soaping agent, raising the temperature to 100 ℃ at the speed of 1 ℃/minute, washing for 15 minutes, and discharging liquid.
Comparative example 3
The yarn, package density, dry weight and process of this comparative example are the same as example 1 except that this comparative example does not have a scouring step, but instead replaces step 4) scouring with the following operations:
4) washing with water: and 3) after discharging, adding warm water at 50 ℃ into the dye vat, and washing for 5 minutes.
Comparative example 4
The yarn and cheese densities, dry weights and processes of this comparative example are the same as example 1 except that in step 3) dyeing of this comparative example, sodium carbonate was added before the temperature was raised:
3) dyeing, namely adding water into a dye vat to maintain the water temperature at 40 ℃, adding 1.2 g/L of a leveling agent, circulating for 10 minutes at 40 ℃, adding 8 percent of active black RHR (owf), circulating for 10 minutes at 40 ℃, adding 80 g/L of anhydrous sodium sulphate, circulating for 10 minutes at 40 ℃, adding 20 g/L of sodium carbonate, circulating for 10 minutes at 40 ℃, then heating the dye solution in the dye vat to 60 ℃ at the speed of 1 ℃/minute, maintaining the temperature of the dye solution at 60 ℃, circularly dyeing for 80 minutes, and discharging the liquid.
Performance testing
GBT 3920-;
GBT 5713 and 2013 textile color fastness test water color fastness;
GBT 3922 and 2013 textile color fastness test has perspiration stain resistance;
GBT 3921-;
the leveling property test method is as follows:
randomly selecting a dyed cheese, cutting 100cm of yarn (marked as front end yarn) from one end close to a tube core, cutting 100cm of yarn (marked as rear end yarn) at the tail end from one end far away from the tube core, cutting 100cm of yarn (marked as middle section yarn) positioned between the front end yarn and the rear end yarn (marked as middle section yarn and positioned at a position where the forward circulating dyeing and the reverse circulating dyeing are not easy to be permeated), taking a white paperboard with the width of 3cm, respectively winding the front end yarn, the middle section yarn and the rear end yarn on different paperboards to form compact color blocks with large areas so as to be convenient for color measurement, and testing the color difference value △ E1 of the front end yarn and the middle section yarn and the color difference value △ E2 of the middle section yarn and the rear end yarn through a computer color measurement system Datecolor 600 (Datacolor company, USA).
Elastic elongation test method: the front end yarn, the middle section yarn and the rear end yarn are intercepted by adopting the method. The yarn was tested for elastic elongation (%) with reference to the standard test method for tensile properties of fabrics for ASTM D3107-2007 elastic yarn machines. In each example, 4 cheeses were randomly selected from the dye vat for testing, and the average value of the test results was recorded in table 1. The elastic elongation (elastic elongation of the base yarn) of the elastic cotton yarn which was not dyed according to the present invention was measured as a control.
Table 1 results of performance test of examples and comparative examples
As can be seen from the above table:
in the comparative examples 1-2, constant-temperature washing at 100 ℃ is adopted in the step 1) and the step 5), so that the elastic elongation at the front end, the elastic elongation at the middle section and the elastic elongation at the rear end of the finally obtained yarn are all obviously reduced, and the problem of losing elasticity of the whole yarn is proved;
compared with the prior art, the method has the advantages that the acid washing step is not adopted after the dyeing of the comparative example 3, water washing is adopted, the elastic elongation of the finally obtained yarn is better than that of the comparative examples 1-2 but still inferior to that of the examples 1-6, and the fact that the residual alkaline dye liquor after the dyeing of the step 3 still reacts with spandex in the step 4) of the comparative example 3 is proved, so that the yarn loses elasticity;
in comparative example 4, the sodium carbonate is added too early, and the anhydrous sodium sulphate is not uniformly distributed inside and outside the cheese, so that the yarn is fixed in advance. Although the elasticity of the yarn has no obvious influence, the problem of large chromatic aberration is caused.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention may be made without departing from the technical spirit of the present invention.
Claims (10)
1. The dyeing process of the elastic cotton cone yarn is characterized by sequentially comprising the following steps of: 1) hot water washing-2) cold water washing-3) dyeing-4) acid washing-5) soaping-6) water washing-7) drying;
wherein:
1) hot water washing: putting the elastic cotton cheese into a dye vat, adding water, heating to 85-90 ℃ at the speed of 1-2 ℃/min, washing for 15-20 min, and discharging liquid;
3) dyeing: adding water into a dye vat, maintaining the water temperature at 38-42 ℃, and sequentially adding a leveling agent, a reactive dye and anhydrous sodium sulphate; heating to the water temperature of 58-62 ℃, adding sodium carbonate, performing heat preservation and dyeing for 75-85 minutes, and discharging liquid;
5) soaping, namely adding water into the dye vat, adding 1-3 g/L soaping agent, heating to 85-90 ℃ at the speed of 1-2 ℃/min, washing for 15-20 min, and discharging liquor;
7) drying: and (3) dehydrating the elastic cotton cheese, and drying at 60-90 ℃ until the moisture content of the elastic cotton cheese is 3-4%.
2. The dyeing process of the elastic cotton cone yarn according to claim 1, characterized in that 0.5-2 g/L of penetrant is added in the step 1).
3. The dyeing process of the elastic cotton cone yarn according to claim 2, characterized in that: the penetrating agent is a penetrating agent WX-3301.
4. The dyeing process of the elastic cotton cone yarn according to claim 1, characterized in that: the density of the stretch cotton cheese obtained in the step 1) is 0.26-0.3 g/cm3And the net weight of the yarns on each cheese is 800-850 g.
5. The dyeing process of the elastic cotton cone yarn according to claim 1, characterized in that: the specific operation of the step 2) cold water washing is as follows: adding water into the dye vat, washing for 5-10 minutes at 20-30 ℃, and discharging liquid; the concrete operation of the step 6) cold water washing is as follows: adding water into the dye vat, washing for 5-10 minutes at 20-30 ℃, and discharging liquid.
6. The dyeing process of the elastic cotton cone yarn according to claim 1 or 5, characterized in that: and 6) washing with cold water for 1-3 times.
7. The dyeing process of the elastic cotton cone yarn according to claim 1, characterized in that: the pickling in the step 4) comprises the following specific operations: adding water into a dye vat, adding weak acid to adjust the pH value to be neutral, washing for 8-15 minutes at 20-30 ℃, and discharging liquid.
8. The dyeing process of the elastic cotton cone yarn according to claim 1, characterized in that the specific operation of the step 3) is to add water into a dye vat to maintain the water temperature at 40 ℃, add a leveling agent at 0.8-1.2 g/L, circulate at 40 ℃ for 8-10 minutes, add a reactive dye at 0.5-8% (owf), circulate at 40 ℃ for 8-10 minutes, add anhydrous sodium sulphate at 75-85 g/L, circulate at 40 ℃ for 8-10 minutes, then raise the temperature of the dyeing solution in the dye vat to 60 ℃ at the speed of 1 ℃/minute, add sodium carbonate at 18-23 g/L, maintain the temperature of the dyeing solution at 60 ℃, circularly dye for 75-85 minutes, and discharge the liquor.
9. The dyeing process of the elastic cotton cone yarn according to claim 1, characterized in that: the leveling agent is a leveling agent FR-301.
10. The dyeing process of the elastic cotton cone yarn according to claim 1, characterized in that: and 7), drying at 85-90 ℃.
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