A low-water dyeing process for polyester-cotton blended fabric

Abstract

The present application relates to the technical field of dyeing polyester-cotton blended fabrics, and specifically discloses a low-water dyeing process for polyester-cotton blended fabrics. A low-water dyeing process for polyester-cotton blended fabrics comprises the following steps: S1: preparing a dye bath base liquid, the dye bath base liquid is mainly made of the following raw materials in parts by weight: 260-300 parts of decamethylcyclopentasiloxane, 30-50 parts of water, 5-10 parts of dimethyl sulfoxide, 3-5 parts of ethylene glycol, 2-3 parts of urea, 6-8 parts of soda ash, 4-6 parts of sodium alginate, 1-2 parts of a dye accelerator, and 5-7.5 parts of an anti-staining agent; S2: taking the dye bath base liquid, adding disperse dyes and reactive dyes to the dye bath base liquid, and then placing the polyester-cotton blended fabric in the dye bath for dyeing; S3: washing and drying the polyester-cotton blended fabric dyed in step S2. The low-water dyeing process for polyester-cotton blended fabrics of the present application has the advantages of high dye uptake and low staining rate.

Description

Technical Field

[0001] The present application relates to the technical field of dyeing polyester-cotton blended fabrics, and more specifically, to a low-water dyeing process for polyester-cotton blended fabrics. Background Art

[0002] Polyester-cotton blended fabric not only highlights the style of polyester, but also has the advantages of cotton fabric. It has good elasticity and wear resistance in dry and wet conditions, and has the advantages of dimensional stability, small shrinkage, uprightness, not easy to wrinkle, easy to wash, and quick drying. It is deeply loved by consumers and occupies an important position in the textile market.

[0003] Due to the different physical and chemical properties of polyester and cotton fibers, polyester is dyed with disperse dyes at high temperatures, while cotton fibers are dyed with reactive dyes at lower temperatures. Therefore, polyester-cotton blended fabrics are mostly dyed using the two-bath method and the one-bath two-step method. These dyeing processes usually use water as the dyeing medium. The main problems are that dyeing is time-consuming, production efficiency is low, water, electricity, steam, etc. are consumed more, and a large amount of high COD wastewater is generated, which is very unfriendly to the environment.

[0004] At present, technicians have developed water-saving dyeing and non-aqueous medium dyeing technologies to address the problem of high water consumption in dyeing. The non-aqueous medium dyeing technology uses supercritical carbon dioxide system, reverse micelle system, and organic solvent suspension system for dyeing, which can achieve better water-saving and emission reduction effects.

[0005] For the above-mentioned non-aqueous medium dyeing process, although the dyeing conditions of polyester and cotton fibers are different, mutual staining still occurs, which has an adverse effect on the dyeing quality of the fabric. Summary of the invention

[0006] In order to improve the staining problem of polyester-cotton blended fabrics in non-aqueous medium dyeing, the present application provides a low-water dyeing process for polyester-cotton blended fabrics.

[0007] In a first aspect, the present application provides a low-water dyeing process for polyester-cotton blended fabrics, which adopts the following technical scheme: a low-water dyeing process for polyester-cotton blended fabrics, comprising the following steps:

[0008] S1: preparing a dye bath base liquid, wherein the dye bath base liquid is mainly made of the following raw materials in parts by weight: 260-300 parts of decamethylcyclopentasiloxane, 30-50 parts of water, 5-10 parts of dimethyl sulfoxide, 3-5 parts of ethylene glycol, 2-3 parts of urea, 6-8 parts of soda ash, 4-6 parts of sodium alginate, 1-2 parts of a dye accelerator, and 5-7.5 parts of an anti-staining agent; the anti-staining agent is composed of sodium dodecyl sulfate, halogenated indanone, and thiodiglycol in a mass ratio of (15-20):(6.5-9):(2.2-3.6);

[0009] S2: taking a dye bath base liquid, adding 1-1.5% (owf) disperse dye and 1-1.5% (owf) reactive dye into the dye bath base liquid, then placing the polyester-cotton blended fabric in the dye bath, heating it to 135-150° C., keeping it warm for 50-70 minutes, then cooling it down to 70-85° C., keeping it warm for 20-25 minutes, and then cooling it down to room temperature to complete dyeing;

[0010] S3: Washing and drying the polyester-cotton blended fabric dyed in step S2.

[0011] By adopting the above technical scheme, the polyester-cotton blended fabric is dyed by one-bath one-step method, and an appropriate amount of active dyes and disperse dyes are added to the dye bath base liquid, and the temperature is first raised to 135-150°C for disperse dye dyeing, and then cooled to 70-85°C for active dye dyeing. In this process, small molecule disperse dyes penetrate and diffuse into the polyester fiber, and have a better dyeing rate. The reactive dye has more polar groups in the molecular structure and a larger molecular volume, which is easy to form van der Waals force with polyester fiber, and the sodium dodecyl sulfate and halogenated indanone in the anti-staining agent can compete with the reactive dye for adsorption, and greatly reduce the staining of the reactive dye on the polyester fiber through shielding and steric hindrance effects.

[0012] In addition, disperse dyes have strong permeability and are easy to form hydrogen bonds with carbonyl groups on cotton fibers. In the present application, sodium dodecyl sulfate and halogenated indanone are used to form molecular adsorption on the surface of cotton fibers, and thiodiglycol is embedded in the adsorption layer to form a continuous phase interface layer, which can inhibit the penetration of disperse dyes into the interior of cotton fibers, while reducing the contact area between disperse dyes with linear molecular structures and the surface of cotton fibers, reducing the staining of disperse dyes on cotton fibers, and through the comprehensive effect of anti-staining agents, greatly reducing the mutual contamination of polyester-cotton blended fabrics, the fabric has high dyeing rate and leveling rate, and low staining rate.

[0013] Preferably, the halogenated indanone is at least one of 5-bromoindanone, 2-bromoindanone and 6-fluoro-1-indanone.

[0014] By adopting the above technical scheme, the types of substituents of halogenated indanone are optimized and adjusted, the binding force between halogenated indanone and cotton fiber is improved, the influence of thermal motion effect on the adsorption state is reduced, and the penetration and migration of dye molecules caused by uneven adsorption of halogenated indanone are reduced.

[0015] Preferably, the halogenated indanone is composed of 5-bromoindanone and 6-fluoro-1-indanone in a molar ratio of (5-10):(2-3.5).

[0016] By adopting the above technical scheme, the composition ratio of halogenated indanone is further tested and adjusted, the structural stability of the continuous phase interface layer is improved, the penetration inhibition effect on disperse dyes is enhanced, and an affinity effect can be produced for reactive dyes, which is beneficial to increase the dyeing rate of reactive dyes in cotton fibers.

[0017] Preferably, in step S2, the temperature is raised to 135-150°C by first raising the temperature to 80°C at a rate of 5-7°C / min, and then raising the temperature to 135-150°C at a rate of 2-4°C / min.

[0018] By adopting the above technical solution, the temperature is first raised to 80°C at a faster rate to promote the diffusion of disperse dye molecules and reduce the occurrence of anti-agglomeration. Then the temperature is raised to 120-160°C at a slower rate to allow the disperse dye molecules to quickly diffuse into the fiber, reduce the occurrence of concentration polarization, and accelerate the movement of molecular chains in the crystalline and non-crystalline regions of the polyester fiber, increase the speed at which the polyester fiber accepts disperse dye molecules, and improve the dyeing rate and fixation rate.

[0019] Preferably, in step S3, the cleaning is first performed with an organic solvent at a temperature of 70-90° C. for 20-30 min, and then with water at a temperature of 85-90° C. for 15-20 min.

[0020] By adopting the above technical solution, the floating color on the surface and internal gaps of the polyester-cotton blended fiber can be removed by first washing with an organic solvent at a temperature of 70-90°C, thereby reducing the amount of subsequent water used. When washing with water at a higher temperature, the dye molecules attached to the fiber surface can be further removed, thereby reducing the occurrence of fabric color spots.

[0021] Preferably, the organic solvent is one of decamethylcyclopentasiloxane, dimethyl sulfoxide, ethanol, xylene, ethyl acetate, and dimethyl carbonate.

[0022] Preferably, the organic solvent is decamethylcyclopentasiloxane.

[0023] By adopting the above technical solution, the type of organic solvent is optimized and adjusted, and the floating color is cleaned without affecting the dye molecules that have been bound to the fiber, thereby improving the color fixation stability of the fabric.

[0024] Preferably, the mass ratio of the decamethylcyclopentasiloxane to the anti-contamination agent is (40-50):1.

[0025] By adopting the above technical scheme, the mass ratio of decamethylcyclopentasiloxane to the anti-staining agent is optimized and adjusted, the anti-staining agent's staining inhibition and competitive dyeing effects are balanced, and while ensuring a better anti-staining effect, a higher dyeing rate is obtained, thereby improving the comprehensive performance of polyester-cotton blended fabrics.

[0026] Preferably, the raw materials of the dye bath base liquid further include 1-1.5 parts by weight of hydroxyethylidene diphosphonic acid.

[0027] By adopting the above technical scheme, hydroxyethylidene diphosphonic acid can be combined with the continuous phase interface layer, improving the molecular arrangement and distribution state, having a stronger inhibitory effect on disperse dye molecules, reducing staining, and at the same time having a chelating and adsorbing effect on active dyes, so that a dye diffusion layer with a stable concentration is formed on the surface of cotton fibers, thereby improving the dyeing rate of cotton fibers.

[0028] Preferably, in step S2, the temperature is lowered to room temperature at a rate of 1.5-3°C / min.

[0029] By adopting the above technical solution and adopting a suitable cooling speed for cooling, the migration and separation of dye molecules inside the fiber caused by too fast cooling speed can be reduced, and the mutual contamination rate of the fabric can be further reduced.

[0030] Preferably, in step S3, the drying is performed at a temperature of 80-100° C. for 1-1.5 hours.

[0031] By adopting the above technical solution, the drying temperature and time are optimized and adjusted, the probability of some dye molecules moving and falling off due to the migration of water molecules during the drying process is reduced, the occurrence of color difference is reduced, and the level dyeing rate of the fabric is improved.

[0032] In summary, this application has the following beneficial effects:

[0033] 1. Since the present application adopts a one-bath one-step dyeing process with a non-aqueous medium, water consumption can be greatly reduced. And through the multiple comprehensive effects of the anti-staining agent, such as inhibition, competitive dyeing, adsorption, chelation, etc., not only the mutual contamination of reactive dyes and disperse dyes on polyester fibers and cotton fibers is reduced, but also the dyeing rate and leveling rate of the fabric are improved, and the appearance of the fabric is better.

[0034] 2. In the present application, a suitable dyeing process is preferably used in combination with a suitable anti-staining agent component, which further reduces the probability of staining of polyester-cotton fibers, and the addition of hydroxyethylidene diphosphonic acid improves the inhibition and dyeing-promoting effect of the continuous phase interface layer, thereby improving the overall performance of the fabric.

[0035] 3. The fabric produced by the low-water dyeing process for polyester-cotton blended fabric of the present application has a higher dye uptake rate and leveling rate, and a lower staining rate. DETAILED DESCRIPTION

[0036] The present application is further described in detail below with reference to the embodiments.

[0037] Unless otherwise specified, the raw materials used in the examples and comparative examples of the present application are all commercially available.

[0038] Example

[0039] Example 1

[0040] The low-water dyeing process for the polyester-cotton blended fabric of this embodiment comprises the following steps:

[0041] S1: preparing a dye bath base liquid, which is prepared by uniformly mixing the following raw materials by weight: 30 kg of decamethylcyclopentasiloxane, 3 kg of water, 0.5 kg of dimethyl sulfoxide, 0.5 kg of ethylene glycol, 0.2 kg of urea, 0.8 kg of soda ash, 0.4 kg of sodium alginate, 0.1 kg of a dye accelerator, and 0.75 kg of an anti-staining agent;

[0042] The anti-contamination agent is composed of sodium dodecyl sulfate, 4-chloroindanone, and thiodiglycol in a mass ratio of 15:9:2.2;

[0043] S2: taking a dye bath base liquid and placing it in a dye vat, adding 1% (owf) disperse dye and 1.5% (owf) reactive dye into the dye bath base liquid, and then placing the polyester-cotton blended fabric in the dye bath, with a bath ratio of 1:30 and a liquid carrying rate of 135%;

[0044] Then the temperature was raised to 135°C at a rate of 8°C / min, kept at that temperature for 70 min, then cooled to 70°C for 25 min, and then cooled to room temperature at a rate of 5°C / min to complete dyeing;

[0045] S3: The polyester-cotton blended fabric dyed in step S2 is washed with deionized water and then dried at 120° C. for 30 minutes.

[0046] In the polyester-cotton blended fabric, polyester / cotton = 65 / 35. The disperse dye is disperse red 60. The reactive dye is reactive red 195. The dyeing accelerator is sodium sulfate.

[0047] Example 2

[0048] The low-water dyeing process for the polyester-cotton blended fabric of this embodiment comprises the following steps:

[0049] S1: preparing a dye bath base liquid, which is prepared by uniformly mixing the following raw materials by weight: 25 kg of decamethylcyclopentasiloxane, 5 kg of water, 1 kg of dimethyl sulfoxide, 0.3 kg of ethylene glycol, 0.3 kg of urea, 0.6 kg of soda ash, 0.6 kg of sodium alginate, 0.2 kg of dyeing accelerator, and 0.5 kg of anti-staining agent;

[0050] The anti-contamination agent is composed of sodium dodecyl sulfate, 4-chloroindanone, and thiodiglycol in a mass ratio of 15:9:2.2;

[0051] S2: taking a dye bath base liquid and placing it in a dye vat, adding 1.5% (owf) disperse dye and 1.2% (owf) reactive dye into the dye bath base liquid, and then placing the polyester-cotton blended fabric in the dye bath, with a bath ratio of 1:30 and a liquid carrying rate of 135%;

[0052] Then the temperature was raised to 80°C at a rate of 7°C / min, then raised to 135°C at a rate of 2°C / min, kept at that temperature for 50 min, then lowered to 70°C for 20 min, and then lowered to room temperature at a rate of 1.5°C / min to complete dyeing;

[0053] S3: The polyester-cotton blended fabric dyed in step S2 is washed with deionized water and then dried at 100° C. for 1 hour.

[0054] In the polyester-cotton blended fabric, polyester / cotton = 65 / 35. The disperse dye is disperse red 60. The reactive dye is reactive red 195. The dyeing accelerator is sodium sulfate.

[0055] Example 3

[0056] The low-water dyeing process for the polyester-cotton blended fabric of this embodiment comprises the following steps:

[0057] S1: preparing a dye bath base liquid, which is prepared by uniformly mixing the following raw materials by weight: 28 kg of decamethylcyclopentasiloxane, 4.5 kg of water, 0.65 kg of dimethyl sulfoxide, 0.35 kg of ethylene glycol, 0.25 kg of urea, 0.72 kg of soda ash, 0.5 kg of sodium alginate, 0.15 kg of dyeing accelerator, and 0.68 kg of anti-staining agent;

[0058] The anti-contamination agent is composed of sodium dodecyl sulfate, 4-chloroindanone, and thiodiglycol in a mass ratio of 15:9:2.2;

[0059] S2: taking a dye bath base liquid and placing it in a dye vat, adding 1.2% (owf) disperse dye and 1% (owf) reactive dye into the dye bath base liquid, and then placing a polyester-cotton blended fabric in the dye bath, with a bath ratio of 1:30 and a liquid carrying rate of 135%;

[0060] Then the temperature was raised to 80°C at a rate of 5°C / min, then raised to 150°C at a rate of 4°C / min, kept at that temperature for 50 min, then lowered to 70°C for 20 min, and then lowered to room temperature at a rate of 3°C / min to complete dyeing;

[0061] S3: The polyester-cotton blended fabric dyed in step S2 is washed with deionized water and then dried at 80° C. for 1.5 hours.

[0062] In the polyester-cotton blended fabric, polyester / cotton = 65 / 35. The disperse dye is disperse red 60. The reactive dye is reactive red 195. The dyeing accelerator is sodium sulfate.

[0063] Example 4

[0064] The difference between the low-water dyeing process for polyester-cotton blended fabrics in this embodiment and that in Embodiment 3 is that in step S1, the anti-staining agent in the raw materials of the dye bath base liquid is composed of sodium dodecyl sulfate, 4-chloroindanone, and thiodiglycol in a mass ratio of 20:6.5:3.6, and the rest is the same as in Embodiment 3.

[0065] Example 5

[0066] The difference between the low-water dyeing process for polyester-cotton blended fabrics in this embodiment and that in Embodiment 3 is that in step S1, the anti-staining agent in the raw materials of the dye bath base liquid is composed of sodium dodecyl sulfate, 4-chloroindanone, and thiodiglycol in a mass ratio of 17.5:8:3.2, and the rest is the same as in Embodiment 3.

[0067] Example 6

[0068] The difference between the low-water dyeing process for polyester-cotton blended fabric in this embodiment and that in Embodiment 5 is that in step S1, the raw material of the dye bath base liquid contains 6-fluoro-1-indanone, and the rest is the same as that in Embodiment 5.

[0069] Example 7

[0070] The difference between the low-water dyeing process for polyester-cotton blended fabric of this embodiment and that of Embodiment 5 is that in step S1, the raw materials of the dye bath base liquid include halogenated indanone composed of 5-bromoindanone and 6-fluoro-1-indanone in a molar ratio of 5:3.5, and the rest is the same as that of Embodiment 5.

[0071] Example 8

[0072] The difference between the low-water dyeing process for polyester-cotton blended fabric of this embodiment and that of Embodiment 5 is that in step S1, the raw materials of the dye bath base liquid include halogenated indanone composed of 5-bromoindanone and 6-fluoro-1-indanone in a molar ratio of 10:2, and the rest is the same as that of Embodiment 5.

[0073] Example 9

[0074] The low-water dyeing process for the polyester-cotton blended fabric of this embodiment is different from that of Embodiment 8 in that: in step S3, the dye is first washed with xylene at 90°C for 20 minutes, and then washed with deionized water at 85°C for 20 minutes, and the rest is the same as that of Embodiment 8.

[0075] Example 10

[0076] The low-water dyeing process of the polyester-cotton blended fabric of this embodiment is different from that of Embodiment 8 in that: in step S3, the dye is first washed with decamethylcyclopentasiloxane at 70°C for 30 minutes, and then washed with deionized water at 90°C for 15 minutes, and the rest is the same as that of Embodiment 8.

[0077] Embodiment 11

[0078] The difference between the low-water dyeing process for polyester-cotton blended fabric in this embodiment and that in embodiment 10 is that in step S1, the raw materials of the dye bath base liquid also include 0.15 kg of hydroxyethylidene diphosphonic acid, and the rest is the same as in embodiment 10.

[0079] Example 12

[0080] The difference between the low-water dyeing process for polyester-cotton blended fabric in this embodiment and that in embodiment 10 is that in step S1, the raw materials of the dye bath base liquid also include 0.1 kg of hydroxyethylidene diphosphonic acid, and the rest is the same as in embodiment 10.

[0081] Comparative Example

[0082] Comparative Example 1

[0083] The low-water dyeing process of the polyester-cotton blended fabric of this comparative example comprises the following steps:

[0084] S1: preparing a dye bath base liquid, which is prepared by uniformly mixing the following raw materials by weight: 28.68 kg of decamethylcyclopentasiloxane, 4.5 kg of water, 0.65 kg of dimethyl sulfoxide, 0.35 kg of ethylene glycol, 0.25 kg of urea, 0.72 kg of soda ash, 0.5 kg of sodium alginate, and 0.15 kg of a dye accelerator;

[0085] S2: taking a dye bath base liquid and placing it in a dye vat, adding 1.2% (owf) disperse dye and 1% (owf) reactive dye into the dye bath base liquid, and then placing a polyester-cotton blended fabric in the dye bath, with a bath ratio of 1:30 and a liquid carrying rate of 135%;

[0086] Then the temperature was raised to 80°C at a rate of 5°C / min, then raised to 150°C at a rate of 4°C / min, kept at that temperature for 50 min, then lowered to 70°C for 20 min, and then lowered to room temperature at a rate of 3°C / min to complete dyeing;

[0087] S3: The polyester-cotton blended fabric dyed in step S2 is washed with deionized water and then dried at 80° C. for 1.5 hours.

[0088] In the polyester-cotton blended fabric, polyester / cotton = 65 / 35. The disperse dye is disperse red 60. The reactive dye is reactive red 195. The dyeing accelerator is sodium sulfate.

[0089] Comparative Example 2

[0090] The difference between the low-water dyeing process for polyester-cotton blended fabric in this comparative example and that in Example 1 is that in step S1, the anti-staining agent in the raw materials of the dye bath base liquid is sodium dodecyl sulfate, and the rest is the same as in Example 1.

[0091] Comparative Example 3

[0092] The difference between the low-water dyeing process for polyester-cotton blended fabric in this comparative example and that in Example 1 is that in step S1, the anti-staining agent in the raw materials of the dye bath base liquid is composed of sodium dodecyl sulfate and thiodiglycol in a mass ratio of 20:3.6, and the rest is the same as in Example 1.

[0093] Comparative Example 4

[0094] The difference between the low-water dyeing process for polyester-cotton blended fabric in this comparative example and that in Example 1 is that in step S1, the anti-staining agent in the raw materials of the dye bath base liquid is composed of sodium dodecyl sulfate and 4-chloroindanone in a mass ratio of 20:6.5, and the rest is the same as in Example 1.

[0095] Comparative Example 5

[0096] The difference between the low-water dyeing process of the polyester-cotton blended fabric in this comparative example and that in Example 1 is that in step S1, the anti-staining agent in the raw materials of the dye bath base liquid is composed of sodium dodecyl sulfate and phenylthiourea in a mass ratio of 20:6.5:3.6, and the rest is the same as in Example 1.

[0097] Performance testing

[0098] Detection Methods

[0099] The polyester-cotton blended fabrics obtained in Examples 1-12 and Comparative Examples 1-5 were tested for the staining rate of disperse dyes on cotton fibers and the staining rate of reactive dyes on polyester, wherein the staining rate of disperse dyes on cotton fibers is the percentage of disperse dyes stained on cotton fibers in the total disperse dyes, and the staining rate of reactive dyes on polyester is the percentage of reactive dyes stained on polyester in the total reactive dyes. The test results are shown in Table 1.

[0100] Table 1 Test data of staining rate of polyester-cotton blended fabrics in low-water dyeing process of Examples 1-12 and Comparative Examples 1-5

[0101]

[0102]

[0103] It can be seen from the analysis of Examples 1-3 and Comparative Example 1 in combination with Table 1 that the use of decamethylcyclopentasiloxane as a non-aqueous dyeing medium and the addition of disperse dyes and reactive dyes for one-bath one-step dyeing can greatly reduce water consumption. In addition, the addition of an anti-staining agent, on the one hand, plays a competitive dyeing role on the reactive dyes, reducing the staining rate of the reactive dyes on polyester, and on the other hand, sodium dodecyl sulfate and halogenated indanone form molecular adsorption on the surface of cotton fibers, and form a continuous phase interface layer with the assistance of thiodiglycol, inhibiting the staining of disperse dyes on cotton fibers, and overall reducing the mutual staining rate of polyester-cotton components during the dyeing process. It can be seen that compared with Comparative Example 1 without adding an anti-staining agent, Example 3 has a staining rate of disperse dyes on cotton fibers reduced by about 66%, and a staining rate of reactive dyes on polyester reduced by about 47.4%. Furthermore, analysis of Examples 1-3 shows that the staining rate of reactive dyes on polyester has a certain relationship with the content of soda ash. Soda ash can promote the hydrolysis of reactive dyes attached to the surface of polyester and reduce the staining rate of reactive dyes in the polyester component.

[0104] It can be seen from the analysis of Examples 1-3 and Comparative Examples 2-5 in combination with Table 1 that the use of sodium dodecyl sulfate alone as an anti-staining agent cannot form a continuous phase interface layer on the surface of cotton fibers, and cannot effectively inhibit the staining of disperse dyes on cotton fibers. The use of sodium dodecyl sulfate and thiodiglycol in combination and the use of sodium dodecyl sulfate and 4-chloroindanone in combination cannot effectively inhibit disperse dyes, which may be due to the imperfect structure of the continuous phase interface layer formed.

[0105] It can be seen from the analysis of Examples 4-5 and Examples 6-8 in combination with Table 1 that the composition and ratio of the anti-staining agent are optimized and adjusted, and the substituents of the halogenated indanone are screened to further reduce the mutual staining of the disperse dye and the reactive dye on the polyester-cotton component.

[0106] It can be seen from the analysis of Examples 9-10 and Examples 11-12 in combination with Table 1 that the optimization and adjustment of the cleaning process can remove floating colors and unfixed dyes on polyester-cotton blended fabrics and improve the levelness of the fabric. In addition, after the addition of hydroxyethylidene diphosphonic acid, the structural stability of the continuous phase interface layer can be enhanced, further inhibiting the staining effect of disperse dyes on cotton fibers, while improving the dyeing speed and dyeing effect of reactive dyes on cotton fibers.

[0107] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A low-water dyeing process for polyester-cotton blended fabric, characterized in that: The steps include: S1: preparing a dye bath base liquid, wherein the dye bath base liquid is mainly made of the following raw materials in parts by weight: 260-300 parts of decamethylcyclopentasiloxane, 30-50 parts of water, 5-10 parts of dimethyl sulfoxide, 3-5 parts of ethylene glycol, 2-3 parts of urea, 6-8 parts of soda ash, 4-6 parts of sodium alginate, 1-2 parts of a dye accelerator, and 5-7.5 parts of an anti-staining agent; the anti-staining agent is composed of sodium dodecyl sulfate, halogenated indanone, and thiodiglycol in a mass ratio of (15-20):(6.5-9):(2.2-3.6); S2: Take the dye bath base liquid, add 1-1.5% (owf) disperse dye and 1-1.5% (owf) reactive dye into the dye bath base liquid, then place the polyester-cotton blended fabric in the dye bath, heat it to 135-150℃, keep it warm for 50-70min, then cool it down to 70-85℃ and keep it warm for 20-25min, then cool it down to room temperature to complete dyeing; S3: washing and drying the polyester-cotton blended fabric dyed in step S2; The halogenated indanone is at least one of 5-bromoindanone, 2-bromoindanone and 6-fluoro-1-indanone.

2. The low-water dyeing process for polyester-cotton blended fabric according to claim 1, characterized in that: The halogenated indanone is composed of 5-bromoindanone and 6-fluoro-1-indanone in a molar ratio of (5-10):(2-3.5).

3. The low-water dyeing process for polyester-cotton blended fabric according to claim 1, characterized in that: In step S2, the temperature is raised to 135-150°C by first raising the temperature to 80°C at a rate of 5-7°C / min, and then raising the temperature to 135-150°C at a rate of 2-4°C / min.

4. The low-water dyeing process for polyester-cotton blended fabric according to claim 1, characterized in that: In step S3, the cleaning is firstly performed with an organic solvent at a temperature of 70-90° C. for 20-30 minutes, and then with water at a temperature of 85-90° C. for 15-20 minutes.

5. The low-water dyeing process for polyester-cotton blended fabric according to claim 4, characterized in that: The organic solvent is one of decamethylcyclopentasiloxane, dimethyl sulfoxide, ethanol, xylene, ethyl acetate and dimethyl carbonate.

6. The low-water dyeing process for polyester-cotton blended fabric according to claim 1, characterized in that: The mass ratio of the decamethylcyclopentasiloxane to the anti-contamination agent is (40-50):

1.

7. The low-water dyeing process for polyester-cotton blended fabric according to claim 1, characterized in that: The raw materials of the dye bath base liquid also include 1-1.5 parts by weight of hydroxyethylidene diphosphonic acid.

8. The low-water dyeing process for polyester-cotton blended fabric according to claim 1, characterized in that: In the step S2, the temperature is lowered to room temperature at a rate of 1.5-3°C / min.

9. The low-water dyeing process for polyester-cotton blended fabric according to claim 1, characterized in that: In step S3, the drying is performed at a temperature of 80-100° C. for 1-1.5 hours.

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