CN110886113B - Disperse dye dyeing method for treating cotton fabric by using waterborne polyurethane - Google Patents
Disperse dye dyeing method for treating cotton fabric by using waterborne polyurethane Download PDFInfo
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- CN110886113B CN110886113B CN201911311236.6A CN201911311236A CN110886113B CN 110886113 B CN110886113 B CN 110886113B CN 201911311236 A CN201911311236 A CN 201911311236A CN 110886113 B CN110886113 B CN 110886113B
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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
- D06P3/6033—Natural or regenerated cellulose using dispersed dyes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
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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
- D06P1/0032—Determining dye recipes and dyeing parameters; Colour matching or monitoring
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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
- D06P1/16—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 dispersed, e.g. acetate, dyestuffs
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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
- D06P1/52—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 using compositions containing synthetic macromolecular substances
- D06P1/5264—Macromolecular compounds obtained otherwise than by reactions involving only unsaturated carbon-to-carbon bonds
- D06P1/5285—Polyurethanes; Polyurea; Polyguanides
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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
- D06P5/22—Effecting variation of dye affinity on textile material by chemical means that react with the fibre
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
- D06M2200/20—Treatment influencing the crease behaviour, the wrinkle resistance, the crease recovery or the ironing ease
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- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Coloring (AREA)
Abstract
The invention relates to the technical field of textile, and discloses a disperse dye dyeing method for treating cotton fabric by aqueous polyurethane, which comprises the following steps: (1) non-ironing pretreatment: the method comprises the following steps of (1) carrying out non-ironing finishing on cotton fabrics by using waterborne polyurethane as a non-ironing finishing agent, wherein the number average molecular weight of the waterborne polyurethane is 3000-50000; (2) dyeing with a disperse dye: and (3) dyeing the cotton fabric pretreated in the step (1) by using a disperse dye preparation through a disperse dye. The method can effectively dye the cotton fabric by using the disperse dye, has simple process and low sewage treatment cost in the production process, and is environment-friendly.
Description
Technical Field
The invention relates to the technical field of spinning, in particular to a disperse dye dyeing method for treating cotton fabrics by aqueous polyurethane.
Background
The pure cotton fabric is produced by using cotton as a raw material through a textile process, and has the characteristics of moisture absorption, moisture retention, heat resistance, alkali resistance, sanitation and the like. The pure cotton fabric is comfortable to wear and good in skin friendliness, is widely favored by people, and is particularly considered as the safest fabric in infant clothes.
In the existing dyeing field, the cotton fabric is dyed by using reactive dyes most commonly, but in the reactive dye dyeing process, in order to enable the dyes to have enough affinity to cotton fibers, a large amount of electrolytes (salts) need to be added, and meanwhile, a large amount of alkali needs to be added to provide a needed alkaline environment for dyeing, so that the difficulty of treating the reactive dye dyeing wastewater is greatly increased, and the dyeing cost is also increased. Meanwhile, the active dye is limited by the color spectrum, and has fewer beautiful colors and fluorescent color systems, so that the increasingly growing aesthetic requirements of people cannot be met.
Another common dyeing method is disperse dye dyeing, which is commonly used for dyeing terylene because of its excellent properties of bright and rich color, fastness to washing, rubbing and sun, mildness to skin, and environmental friendliness, and its dyeing process usually requires higher temperature or pressure, for example, the dyeing condition is heating to 130 ℃ and pressurizing or hot melting to 180 ℃. However, since there are many hydrophilic hydroxyl groups on cotton fiber, and the disperse dye is a nonionic dye with low water solubility and strong hydrophobicity, and has no affinity to cotton fiber, it is difficult to dye the cotton fiber with the disperse dye.
Disclosure of Invention
The invention aims to overcome the problems existing in the process of dyeing cotton fabrics by using the reactive dye and provides a disperse dye dyeing method for treating cotton fabrics by using waterborne polyurethane.
In order to achieve the above object, the present invention provides a disperse dye dyeing method for treating cotton fabric with aqueous polyurethane, comprising the steps of:
(1) carrying out non-ironing pretreatment: the method comprises the following steps of (1) carrying out non-ironing finishing on cotton fabrics by using waterborne polyurethane as a non-ironing finishing agent, wherein the number average molecular weight of the waterborne polyurethane is 3000-50000;
(2) dyeing with a disperse dye: and (3) dyeing the cotton fabric pretreated in the step (1) by using a disperse dye preparation through a disperse dye.
Preferably, in step (1), the process of permanent press finishing comprises: soaking cotton fabric in finishing liquid containing water polyurethane at 75-85 deg.c for 3-10 min and baking at 170-150 deg.c for 1.5-3 min, and water washing and stoving at 75-85 deg.c.
Preferably, the finishing liquid containing the waterborne polyurethane further contains a penetrating agent and an auxiliary agent, wherein the concentration of the waterborne polyurethane is 50-100g/L, the concentration of the penetrating agent is 0.1-2g/L, and the concentration of the auxiliary agent is 10-40 g/L.
Preferably, the concentration of the waterborne polyurethane is 60-80g/L, the concentration of the penetrating agent is 0.2-1g/L, and the concentration of the auxiliary agent is 20-30 g/L.
Preferably, the auxiliary agent is at least one of tetraisobutyl titanate, zinc naphthenate and iron octoate.
Preferably, in the step (2), the step of dyeing with the disperse dye includes: adding the cotton fabric into a disperse dye preparation, wherein the bath ratio is 1:10-50, the initial dyeing temperature is 30-60 ℃, then heating up at the heating rate of 1-3 ℃/min, keeping the temperature and dyeing for 40-80min after the temperature reaches 70-100 ℃, then cooling down at the cooling rate of 1-3 ℃/min, taking out the fabric after the temperature is reduced to below 50 ℃, and reducing and cleaning.
Preferably, the disperse dye formulation is a disperse suspension of disperse dye in water, and the amount of the disperse dye is 0.5-5% of the mass of the cotton fabric.
Preferably, the disperse dye is at least one of disperse blue, disperse black, disperse gray, disperse red, disperse violet, disperse yellow and disperse orange.
Preferably, a leveling agent is also included in the disperse dye formulation.
Further preferably, the leveling agent is used in an amount of 0.05% to 0.5% by mass of the disperse dye formulation.
Preferably, the solution used for reduction cleaning is a mixed aqueous solution of sodium hydrosulfite and caustic soda.
Further preferably, the concentration of the sodium hydrosulfite in the solution for reduction cleaning is 0.5-4 g/L.
Further preferably, the concentration of caustic soda in the solution used for the reductive cleaning is 0.5 to 4 g/L.
Preferably, the conditions of the reductive cleaning include: the bath ratio is 1:10-30, the temperature is 70-100 ℃, and the time is 5-30 min.
According to the disperse dye dyeing method for treating the cotton fabric by using the waterborne polyurethane, the waterborne polyurethane is firstly used for carrying out non-ironing finishing on the cotton fabric, so that the non-ironing performance of the cotton fabric is improved; on the other hand, in the non-ironing finishing process, the water-based polyurethane and the cotton fiber are subjected to cross-linking reaction, the hydrophilic group hydroxyl in the cotton fiber is replaced by the hydrophobic group, so that the cotton fiber has affinity to disperse dye, and can be dyed by using a conventional disperse dye dyeing method.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For numerical ranges, each range between its endpoints and individual point values, and each individual point value can be combined with each other to give one or more new numerical ranges, and such numerical ranges should be construed as specifically disclosed herein.
The disperse dye dyeing method for treating cotton fabrics by polyurethane comprises the following steps:
(1) non-ironing pretreatment: the method comprises the following steps of (1) carrying out non-ironing finishing on cotton fabrics by using waterborne polyurethane as a non-ironing finishing agent, wherein the number average molecular weight of the waterborne polyurethane is 3000-50000;
(2) dyeing with a disperse dye: and (3) dyeing the cotton fabric pretreated in the step (1) by using a disperse dye preparation through a disperse dye.
In step (1), preferably, the process of permanent press finishing comprises: soaking the cotton fabric in finishing liquid containing waterborne polyurethane at two times and rolling the cotton fabric at two times to ensure that the liquid carrying rate is 70-80%, drying the cotton fabric for 3-10 minutes at 75-85 ℃, baking the cotton fabric for 1.5-3 minutes at 150-170 ℃, and then taking out the treated cotton fabric to carry out water washing and drying at 75-85 ℃.
The finishing liquid containing the aqueous polyurethane preferably further contains a penetrant and an auxiliary agent. Wherein the concentration of the waterborne polyurethane can be 50-100g/L, preferably 60-80 g/L; the concentration of the penetrant can be 0.1-2g/L, preferably 0.2-1 g/L; the concentration of the auxiliary agent is 10-40g/L, preferably 20-30 g/L.
In the invention, the auxiliary agent can catalyze the reaction of the hydroxyl on the cotton fiber and the waterborne polyurethane. In a specific embodiment, the adjuvant is at least one of tetraisobutyl titanate, zinc naphthenate, and iron octoate.
In the present invention, the penetrant may be one conventionally used in the art, and may be, for example, commercially available penetrant NR.
In the present invention, the aqueous polyurethane may be a commercially available aqueous polyurethane product such as PU-3541 aqueous polyurethane available from Guangzhou Houseyuki New Material Co.
In a specific embodiment, the number average molecular weight of the aqueous polyurethane is preferably 5000-. Herein, the number average molecular weight is determined using gel chromatography (GPC).
In the method of the present invention, the disperse dye dyeing in the step (2) may be performed by using a disperse dye dyeing process which is conventional in the art, as follows, a preferred disperse dye dyeing step in the present invention: adding the cotton fabric into a disperse dye preparation, wherein the bath ratio is 1:10-50, the initial dyeing temperature is 30-60 ℃, then heating up at the heating rate of 1-3 ℃/min, keeping the temperature and dyeing for 40-80min after the temperature reaches 70-100 ℃, then cooling down at the cooling rate of 1-3 ℃/min, taking out the fabric after the temperature is reduced to below 50 ℃, and reducing and cleaning.
In the dyeing operation, disperse dye dyeing is carried out on the cotton fabric by using a dip dyeing method, the cotton fabric is dipped in dyeing liquid, the dyeing liquid is heated at a certain speed to increase the temperature so as to control the dyeing uniformity and the dyeing quality, heat preservation dyeing is carried out after the dyeing liquid reaches a proper temperature, a certain temperature is given to a dyeing system, so that the gaps among cotton fiber molecules are increased, the dye molecules can enter the modified cotton fiber molecules more conveniently and can be filled, dyeing is realized, and the cotton fabric is cooled and reduced and cleaned after dyeing is finished.
In the present invention, the disperse dye formulation is a disperse suspension of disperse dye in water, and the amount of the disperse dye can be 0.5% -5% of the amount of cotton fabric, for example, can be 1%, 2%, 3% or 4%.
In the present invention, the disperse dye is not particularly limited, and disperse dyes that are conventional in the art can dye cotton fabrics according to the scheme of the present invention, for example, the disperse dye may be at least one of disperse blue, disperse black, disperse gray, disperse red, disperse violet, disperse yellow and disperse orange. According to the actual process requirements, disperse dye coloring agents with various dyeing effects are prepared.
In a preferred embodiment of the present invention, a leveling agent is also included in the disperse dye formulation; the amount of the leveling agent can be 0.05-0.5%, preferably 0.1-0.4%, and more preferably 0.15-0.3% of the mass of the disperse dye formulation. The dye is promoted to be uniformly dyed by adding a small amount of leveling agent.
After the disperse dye in the step (2) of the invention is used for dyeing, because the disperse dye can not be completely ensured to completely enter the cotton fiber during dyeing, and some disperse dye can be attached to the surface of the fiber, and the poor dyeing fastness can be caused without removing the loose color, reduction cleaning is needed, and the dye molecules which do not enter the cotton fiber are damaged by using a strong reducing agent, so that the color fastness is improved, and the chromatic light is improved.
In the invention, the solution used for reduction cleaning can be a mixed aqueous solution of sodium hydrosulfite and caustic soda;
further, the concentration of sodium hydrosulfite in the solution used for reduction cleaning is 0.5-4g/L, preferably 1-3 g/L;
further, the concentration of caustic soda in the solution for reduction cleaning is 0.5-4g/L, preferably 1-3 g/L.
In the present invention, the conditions of the reductive cleaning include: the bath ratio may be 1:10-30 (e.g., may be 1:10, 1:15, 1:20, 1:25 or 1:30), the temperature may be 70-100 ℃ (e.g., may be 70 ℃, 80 ℃, 90 ℃ or 100 ℃), and the time may be 5-30min (e.g., may be 5min, 10min, 15min, 20min, 25min or 30 min).
The present invention will be described in detail below by way of examples, but the scope of the present invention is not limited thereto.
Example 1
The method comprises the steps of soaking cotton fabrics in finishing liquid for two times and two rolling, enabling the liquid carrying rate to be 75%, drying at 80 ℃ for 5 minutes, baking at 160 ℃ for 2 minutes, taking out the treated cotton fabrics, washing with water, and drying at 80 ℃, wherein in the finishing liquid, the concentration of waterborne polyurethane (the number average molecular weight is 10000) is 70g/L, the concentration of a penetrant NR is 0.6g/L, and the concentration of tetraisobutyl titanate is 25 g/L.
Adding 10 parts by weight of the pretreated cotton fabric into a disperse dye preparation, wherein the disperse dye preparation contains 0.2 part by weight of disperse red dye and 0.02 part by weight of leveling agent, the bath ratio is 1:20, the initial dyeing temperature is 40 ℃, then the temperature is increased at the rate of 2 ℃/min, after the temperature reaches 90 ℃, the temperature is kept and dyed for 40min, then the temperature is decreased at the rate of 2 ℃/min, the temperature is decreased to 50 ℃, then the fabric is taken out, and then the dyed cotton fabric A1 is obtained by reducing and cleaning for 20min at 80 ℃ by using a mixed aqueous solution of 2g/L caustic soda and 1g/L sodium hydrosulfite at the bath ratio of 1: 20.
Example 2
Soaking the cotton fabric in the finishing liquid for two times and two rolling times to enable the liquid carrying rate to be 75%, drying the cotton fabric for 5 minutes at 80 ℃, baking the cotton fabric for 2 minutes at 160 ℃, taking out the treated cotton fabric, and washing the cotton fabric with water and drying the cotton fabric at 80 ℃, wherein the concentration of the waterborne polyurethane (the number average molecular weight is 8000) in the finishing liquid is 60g/L, the concentration of the penetrant NR is 0.4g/L, and the concentration of the zinc naphthenate is 30 g/L.
Adding 10 parts by weight of the pretreated cotton fabric into a disperse dye preparation, wherein the disperse dye preparation contains 0.4 part by weight of disperse red dye and 0.03 part by weight of leveling agent, the bath ratio is 1:50, the initial dyeing temperature is 30 ℃, then the temperature is raised at the rate of 1 ℃/min, after the temperature reaches 70 ℃, the temperature is preserved and dyed for 80min, then the temperature is lowered at the rate of 1 ℃/min, the temperature is lowered to 40 ℃, then the fabric is taken out, and then the dyed cotton fabric A2 is obtained by reducing and cleaning for 30min at 70 ℃ by using a mixed aqueous solution of 3g/L caustic soda and 2g/L sodium hydrosulfite at the bath ratio of 1: 10.
Example 3
Soaking the cotton fabric in finishing liquid for two times and two rolling to ensure that the liquid carrying rate is 75 percent, drying the cotton fabric for 5 minutes at 80 ℃, baking the cotton fabric for 2 minutes at 160 ℃, taking out the treated cotton fabric, and washing the cotton fabric with water and drying the cotton fabric at 80 ℃, wherein the concentration of waterborne polyurethane (the number average molecular weight is 15000) in the finishing liquid is 80g/L, the concentration of a penetrant NR is 0.8g/L, and the concentration of ferric caprylate is 20 g/L.
Adding 10 parts by weight of the pretreated cotton fabric into a disperse dye preparation, wherein the disperse dye preparation contains 0.5 part by weight of disperse red dye and 0.015 part by weight of leveling agent, the bath ratio is 1:10, the initial dyeing temperature is 60 ℃, then the temperature is raised at the heating rate of 1.5 ℃/min, after the temperature reaches 100 ℃, the cotton fabric is subjected to heat preservation dyeing for 40min, then the temperature is lowered at the cooling rate of 1.5 ℃/min, the cotton fabric is taken out after being cooled to 50 ℃, then a mixed aqueous solution of caustic soda with the concentration of 1g/L and sodium hydrosulfite with the concentration of 3g/L is used, and the cotton fabric A3 is obtained after reduction cleaning for 5min at 100 ℃ by the bath ratio of 1: 30.
Example 4
Soaking the cotton fabric in two-roll finishing liquid to enable the liquid carrying rate to be 75%, drying for 5 minutes at 80 ℃, baking for 2 minutes at 160 ℃, taking out the treated cotton fabric, and washing with water and drying at 80 ℃, wherein in the finishing liquid, the concentration of waterborne polyurethane (the number average molecular weight is 12000) is 65g/L, the concentration of penetrant NR is 0.5g/L, and the concentration of tetraisobutyl titanate is 22 g/L.
Adding 10 parts by weight of the pretreated cotton fabric into a disperse dye preparation, wherein the disperse dye preparation contains 0.1 part by weight of disperse red dye and 0.02 part by weight of leveling agent, the bath ratio is 1:25, the initial dyeing temperature is 35 ℃, then the temperature is increased at the rate of 2 ℃/min, after the temperature reaches 80 ℃, the temperature is kept and dyed for 50min, then the temperature is reduced at the rate of 2 ℃/min, the temperature is reduced to 50 ℃, then the fabric is taken out, and then the dyed cotton fabric A4 is obtained by reducing and cleaning for 15min at 85 ℃ by using a mixed aqueous solution of 2g/L caustic soda and 3g/L sodium hydrosulfite at the bath ratio of 1: 25.
Example 5
Soaking the cotton fabric in the finishing liquid for two times and rolling for 5 minutes at 80 ℃, baking the cotton fabric for 2 minutes at 160 ℃, taking out the treated cotton fabric, and washing the cotton fabric with water and drying the cotton fabric at 80 ℃, wherein in the finishing liquid, the concentration of the waterborne polyurethane (with the number average molecular weight of 6000) is 75g/L, the concentration of the penetrant NR is 0.8g/L, and the concentration of the tetraisobutyl titanate is 28 g/L.
Adding 10 parts by weight of the pretreated cotton fabric into a disperse dye preparation, wherein the disperse dye preparation contains 0.3 part by weight of disperse red dye and 0.02 part by weight of leveling agent, the bath ratio is 1:15, the initial dyeing temperature is 50 ℃, then the temperature is increased at the rate of 2.5 ℃/min, after the temperature reaches 85 ℃, the temperature is kept and dyed for 55min, then the temperature is decreased at the rate of 2.5 ℃/min, the temperature is decreased to 50 ℃, then the fabric is taken out, and then the dyeing cotton fabric A5 is obtained by reducing and cleaning for 20min at 80 ℃ by using a mixed aqueous solution of 2g/L caustic soda and 3g/L sodium hydrosulfite at the bath ratio of 1: 15.
Comparative example 1
Disperse dye dyeing of cotton fabric was carried out according to the method of example 1, except that the cotton fabric was directly dyed without permanent press pretreatment to obtain dyed cotton fabric D1.
Test example
(1) Measurement of K/S value of stained sample
The dyed samples A1-A5 and D1 were measured using a color measuring and matching instrument (available from Datacolor, Inc., USA, model No. Datacolor110), and the K/S values of the respective samples were measured, and the results are shown in Table 1 below. The larger the K/S value is, the darker the surface color of the sample is, and the larger the dye concentration on the surface of the sample is; a smaller K/S value indicates a lighter surface color of the sample and a lower dye concentration at the surface of the sample.
(2) Measurement of color fastness
The dry rubbing fastnesses of the dyed samples A1-A5 and D1 were tested according to the GB/T3920-2008 method, and the results are shown in Table 1 below;
the wet rubbing fastness of the dyed samples A1-A5 and D1 was tested according to the GB/T3920-2008 method, and the results are shown in the following Table 1;
the dyed samples A1-A6 and D1 were tested for their fastness to washing with water according to GB/T5713-1997 and the results are given in Table 1 below.
(3) Test of easy ironing performance
The dyed samples A1-A5 and D1 were tested using AATCC-142 standard, and the higher the DP level, the better the crease and permanent press resistance of the fabric, and the untreated greige cloth has a DP level of 1.0, and the results are shown in Table 1 below.
TABLE 1
The results in table 1 show that when the disperse dye dyeing method for treating cotton fabric with polyurethane according to the present invention is used for dyeing, the obtained cotton fabric can be dyed with disperse dye and obtain a good dyeing effect, specifically, the dyed sample has a darker surface color and a good color fastness, and simultaneously can obtain a good non-ironing property.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A disperse dye dyeing method for treating cotton fabrics by aqueous polyurethane is characterized by comprising the following steps:
(1) non-ironing pretreatment: the method comprises the following steps of (1) carrying out non-ironing finishing on cotton fabrics by using waterborne polyurethane as a non-ironing finishing agent, wherein the number average molecular weight of the waterborne polyurethane is 3000-50000;
(2) dyeing with a disperse dye: carrying out disperse dye dyeing on the cotton fabric obtained after the pretreatment in the step (1) by using a disperse dye preparation;
wherein, in the step (1), the process of the non-ironing finishing comprises the following steps: soaking the cotton fabric in finishing liquid containing waterborne polyurethane for two times and rolling the cotton fabric for two times to ensure that the liquid carrying rate is 70-80%, drying the cotton fabric for 3-10 minutes at 75-85 ℃, baking the cotton fabric for 1.5-3 minutes at 150-170 ℃, and then taking out the treated cotton fabric to carry out water washing and drying at 75-85 ℃;
the finishing liquid containing the waterborne polyurethane further contains a penetrating agent and an auxiliary agent, wherein the concentration of the waterborne polyurethane is 50-100g/L, the concentration of the penetrating agent is 0.1-2g/L, and the concentration of the auxiliary agent is 10-40 g/L;
the auxiliary agent is at least one of tetraisobutyl titanate, zinc naphthenate and iron caprylate;
in the step (2), the step of dyeing with the disperse dye includes: adding the cotton fabric into a disperse dye preparation, wherein the bath ratio is 1:10-50, the initial dyeing temperature is 30-60 ℃, then heating up at the heating rate of 1-3 ℃/min, keeping the temperature and dyeing for 40-80min after the temperature reaches 70-100 ℃, then cooling down at the cooling rate of 1-3 ℃/min, taking out the fabric after the temperature is reduced to below 50 ℃, and reducing and cleaning.
2. The method as claimed in claim 1, wherein the concentration of the aqueous polyurethane is 60-80g/L, the concentration of the penetrating agent is 0.2-1g/L, and the concentration of the auxiliary agent is 20-30 g/L.
3. The method of claim 1, wherein the disperse dye formulation is a disperse suspension of disperse dye in water, and the amount of the disperse dye is 0.5-5% of the mass of the cotton fabric.
4. The method of claim 3, wherein the disperse dye is at least one of disperse blue, disperse black, disperse gray, disperse red, disperse violet, disperse yellow, and disperse orange.
5. The method of claim 3, further comprising a leveling agent in the disperse dye formulation.
6. The method as claimed in claim 5, wherein the levelling agent is used in an amount of 0.05 to 0.5% by mass of the disperse dye formulation.
7. The method according to claim 1, wherein the solution for reductive cleaning is a mixed aqueous solution of sodium hydrosulfite and caustic soda.
8. The method according to claim 7, wherein the concentration of sodium hydrosulfite in the solution for reductive cleaning is 0.5-4 g/L.
9. The method according to claim 7, wherein the concentration of caustic soda in the solution for reductive cleaning is 0.5-4 g/L.
10. The method of claim 7, wherein the reductive cleaning conditions comprise: the bath ratio is 1:10-30, the temperature is 70-100 deg.C, and the time is 5-30 min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE4332219A1 (en) * | 1992-09-24 | 1994-03-31 | Ciba Geigy | Dyeing woollen, silk and esp. cotton fabric with dispersion dyes - by pretreating with hydrophobic finishing agent and then dyeing with dispersion dye in supercritical carbon di:oxide. |
| CN106087463A (en) * | 2016-06-08 | 2016-11-09 | 安徽亚源印染有限公司 | A kind of polyester cotton dispersion reduction stain technique |
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| DE4332219A1 (en) * | 1992-09-24 | 1994-03-31 | Ciba Geigy | Dyeing woollen, silk and esp. cotton fabric with dispersion dyes - by pretreating with hydrophobic finishing agent and then dyeing with dispersion dye in supercritical carbon di:oxide. |
| CN106087463A (en) * | 2016-06-08 | 2016-11-09 | 安徽亚源印染有限公司 | A kind of polyester cotton dispersion reduction stain technique |
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