Short-process dyeing method for dark polyester-cotton knitted fabric

Abstract

The invention discloses a short-process dyeing method for dark polyester-cotton knitted fabrics, which comprises a bath rack and a controller, and is characterized in that the short-process dyeing method also comprises a first motor, a traction line, a sling assembly and bath brush assemblies, each bath brush assembly comprises a brush rack and brush teeth, and the two bath brush assemblies are symmetrically arranged on the front side and the rear side of a bather respectively; first hanging rods are arranged on the left side and the right side of the upper portion of the bath frame respectively, an output shaft of a first motor is connected with a pair of same gear sets, a main shaft of each gear is provided with a shaft with the same diameter, the first motor is driven by a controller, and a traction line is tied to the connecting rods. The first hanging rod and the connecting rod which are located on the same side are connected with a shaft of one gear of the gear set through a traction line, and when the first motor changes the rotating direction, the bath brush assembly moves in the opposite direction. The bathing device is suitable for bathing of old people.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dyeing and finishing process, in particular to a short process dyeing method for dark polyester-cotton knitted fabric. BACKGROUND

[0002] Reference Figure 2 The traditional dyeing process of polyester-cotton knitted fabric includes the following steps: pretreatment → neutralization and oxygen removal → polyester dyeing → reduction cleaning → cotton dyeing → washing → over-acid → soaping → hot washing → washing → color fixing. Since reactive dyes require high-salt dyeing and alkaline fixing, high-salt dyeing solution can reduce the stability of the dispersion system, and dispersion dyes are not stable and easy to decompose under alkaline conditions, so polyester-cotton fabric is usually dyed by two-bath method, and the whole dyeing time is more than 10 hours, the process flow is long, the consumption of water, electricity and steam is large, the utilization rate of dyes is low, and the amount of wastewater discharge is large.

[0003] Chinese patent publication No. CN 106884338A discloses a new process for dyeing polyester-cotton knitted fabric. Compared with the traditional process, the process combines pretreatment and polyester dyeing by using one-bath agent Yakexie TCBN, realizes one-bath oxygen bleaching and polyester dyeing, does not clean after polyester dyeing, reduces the number of hot washing and two reduction cleanings, directly dyes cotton, and shortens the process. After cotton dyeing, the traditional 95℃ two-soaping process is replaced by TCBN environmentally friendly cleaning process, the number of hot washing is reduced, the process is relatively environmentally friendly and has low COD, the burden of wastewater treatment is reduced, the efficiency is improved, pollution discharge is reduced, and the effect of energy saving and emission reduction is achieved. Although the method shortens the process compared with the traditional method, it still needs to dye by two-bath method using dispersion dyes and reactive dyes, a large amount of salt and alkali is required for dyeing dark colors, and the selectivity of dispersion dyes is high, and the range of applicable dyes is narrow.

[0004] Chinese patent publication No. CN 101392462A discloses a one-bath special deep dyeing process for polyester-cotton fabric using dispersion and reactive dyes. The process selects WW series dispersion dyes and C series reactive dyes, immerses pure cotton fabric in the dyeing solution once, then rolls once using a mangle, pre-dries after rolling, then cures after pre-drying, then steams in a steaming box, then washes, then soaps, then washes and dries, and completes the dyeing. The dyeing process uses specific dyes, which has certain limitations. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a short process dyeing method for dark polyester-cotton knitted fabric, to solve the problems of long process flow, low efficiency, high energy consumption and high salt and alkali content of wastewater in the traditional polyester-cotton dyeing process, and to overcome the deficiencies of the prior art.

[0006] To solve the above technical problems, the technical scheme of the present application is as follows:

[0007] A short process dyeing method of dark polyester-cotton knitted fabric, comprising the following steps:

[0008] Step one, pretreatment of polyester-cotton knitted fabric without refining, oil removal and bleaching;

[0009] Step two, adjusting the pH value of the mixed dye bath, one-bath dyeing of polyester-cotton fabric with reactive and disperse dyes, and washing with water.

[0010] Step three, reduction cleaning, and washing with water.

[0011] In step one, pretreatment of polyester-cotton fabric: pretreatment agent DM-2022 3-5 g / L, NaOH: 1-2 g / L, penetrating agent DM-1260 2-3 g / L, dyeing at room temperature, the temperature rising speed is 1-2 ℃ / min, the test bath ratio is 1:5-10, the temperature is raised to 40-60 ℃ and kept for 20-40 min, and then washed with water at room temperature before dyeing;

[0012] In step two, one-bath dyeing of polyester-cotton fabric: reactive dye X%, disperse dye Y%, the initial pH value is adjusted to 4.5-5.0, high-temperature leveling agent DM-2110N 0.3-0.6 g / L, sodium sulfate 20-30 g / L, dyeing at room temperature, the temperature rising speed is 1-2 ℃ / min, the bath ratio is 1:5-10, the temperature is raised to 130 ℃ and kept for 20-40 min, the temperature is then lowered to 70 ℃, 5-10 g / L of pure alkali is added, kept for 20 min, drained, and washed with water;

[0013] In step three, reduction cleaning: reduction cleaning agent DM-8931 2 g / L, NaOH: 1 g / L, the temperature rising speed is 2 ℃ / min, the bath ratio is 1:5-10, the temperature is raised to 80 ℃ and kept for 20 min, drained, and washed with water.

[0014] The pretreatment liquid DM-2022 is a complex of high-molecular cationic polymers, including one or more combinations of epoxytrimethylamine quaternary ammonium compound, polyepoxy compound, single-active single quaternary ammonium salt, single-active double quaternary ammonium salt, single-active double quaternary ammonium salt, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, polyamide chloroepoxy propane resin, chitosan, modified starch, polyamine polymer, and polycationic polymer.

[0015] The non-ionic penetrating agent DM-1260 is a complex of multiple surfactants, including one or more combinations of polyoxyethylene sorbitan ester, polyoxyethylene alkyl phenol ether, polyoxyethylene fatty alcohol ether, polyoxyethylene polyoxypropylene block copolymer, polyoxyethylene fatty acid ester, and alkyl glycoside.

[0016] The disperse dye and the reactive dye are not specifically limited, and common reactive dyes can be used, preferably, the reactive dye is one or more of a combination of monochlorotriazine reactive dyes, dichlorotriazine reactive dyes, double-monochlorotriazine reactive dyes, and monochlorotriazine / vinyl sulfone double-active-group reactive dyes.

[0017] The leveling agent DM-2110N is a compound of special surfactants, anion / non-ionic, which is a high-temperature leveling agent for polyester dispersion high-temperature dyeing, can improve the dyeing rate of disperse dyes, has good slow dyeing and migration, does not fade, has excellent dispersion and leveling effect, and can effectively remove oligomers. It can prevent dye particles from accumulating and crystalline growth, promote the diffusion of dye molecules from the surface of the fiber to the inside, effectively improve the utilization rate of dyes, has strong slow dyeing ability, can effectively adjust the initial dyeing rate of dyeing, coordinate the synchronous dyeing of mixed dyes, and also has little effect on the color of cotton dyed with reactive dyes.

[0018] The reducing cleaning agent DM-8931 is a compound of multiple reducing agents, which does not contain sulfur compared with sodium hydrosulfite, has no odor of sodium hydrosulfite, is safer and more environmentally friendly.

[0019] The above technical scheme has the following beneficial effects:

[0020] 1) The polyester-cotton dyeing process of the present application has short process flow, high efficiency, small energy consumption, uniform color, less pollution, low dye selectivity, and wide application range.

[0021] 2) The traditional process of polyester-cotton knitted fabric requires oil removal of polyester and scouring and bleaching of cotton. Generally, scouring agent, oil removal agent, caustic soda and hydrogen peroxide are added at 98 DEG C for 45 min, while the short process dyeing new process of dark polyester-cotton knitted fabric of the present application only needs to add pretreatment agent, caustic soda and penetrating agent for pretreatment at 40-60 DEG C for 30 min, and the hand feeling after dyeing is better. The high-temperature scouring, oil removal and bleaching steps can be omitted.

[0022] 3) By shortening the process flow of the dispersion active one-bath method: traditional cotton dyeing of dark color needs to add more than 100 g / L of sodium sulphate, and high-salt dyeing liquor of 20-30 g / L of soda ash will reduce the stability of the dispersion system, and the dispersion dye is not stable and easy to decompose under alkaline conditions, so it is difficult to realize the dispersion one-bath method for dyeing dark color. By pretreatment with DM-2022, the cationic polymer with active groups and easy film-forming is used to cationize the cotton fiber after pretreatment, so as to change the combination mode of active dye and cotton fiber, so that the active dye can be used to dye cotton under weakly acidic conditions. For dyeing dark color, adding an appropriate amount of sodium sulphate 20-30 g / L is beneficial to improve the dyeing depth, and the low electrolyte content does not affect the stability of the dispersion dyeing liquor, that is, it does not affect the high-temperature dyeing of polyester dispersion dye. Thus, the dispersion active one-bath dyeing can be realized, the dyeing and finishing process is greatly shortened, the production efficiency is improved, and the washing fastness is excellent, which meets the customer's requirements.

[0023] 4) Because the conditions for conventional dispersion dyeing of polyester are completely met, all dispersion dyes are suitable for use, and the selection of active dyes is small. Because the active dye has a high combination with cotton at low temperature (30-80 DEG C) and a low degree of hydrolysis at high temperature under weakly acidic conditions, most conventional active dyes can meet the requirements.

[0024] 5) Compared with the traditional process, 4 hours of time is saved, 5 tanks of water are saved, 100 kWh of electricity is saved, and 0.8 cubic meters of steam is saved. The specific cost saving items are shown in Table 1:

[0025] Item One bath saving Process time 4h Electricity 25KW / h*4*1.0 yuan / KWh=100 yuan Steam 0.8*400=320 yuan Water 50 tons*5=250 yuan Soda ash 15*10*2.7=405 yuan Anhydrous sodium sulfate 70*10*0.8=560 yuan Pretreatment agent -900 Total 735 yuan

[0026] Note: The data in Table 1 is based on dyeing 1 t of cloth.

[0027] The above-mentioned new process for short process dyeing of dark polyester-cotton knitted fabric has the significance of shortening the process, improving the efficiency, saving the cost, reducing the consumption of water resources and energy of polyester-cotton fabric in printing and dyeing, which will be beneficial to reduce carbon emissions and truly help the green production of the printing and dyeing industry. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only exemplary, and those skilled in the art can also obtain other implementation drawings according to the provided drawings without creating any creative labor.

[0029] Figure 1 The flow chart of the short process dyeing of dark polyester-cotton knitted fabric of the present application.

[0030] Figure 2The short process dyeing flow chart of the existing polyester cotton knitted fabric.

[0031] Figure 3 The K / S value comparison chart of the polyester cotton knitted fabric of the embodiment one of the present application and the traditional process.

[0032] Figure 4 The K / S value comparison chart of the polyester cotton knitted fabric of the embodiment two of the present application and the traditional process. DETAILED DESCRIPTION

[0033] The specific embodiments of the present application will be further described below in conjunction with the accompanying drawings. It should be noted that the description of the embodiments is used to help understand the present application, but does not constitute a limitation on the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0034] Embodiment one

[0035] The new process of short process dyeing of dark polyester cotton knitted fabric of the present embodiment is to dye black on the polyester cotton interwoven fabric (65% / 35%), and the specific steps are as follows:

[0036] First step: pretreatment of the polyester cotton interwoven fabric

[0037] Formulation and process: DM-2022: 5g / L, NaOH: 1g / L, penetrant DM-1260: 1g / L, 1:10, 60℃ for 30min, neutralization and washing.

[0038] Second step: disperse active one-bath dyeing

[0039] Formulation and process:

[0040] Disperse black EX-SF: 3% (O.W.F)

[0041] Active black PHE: 5% (O.W.F)

[0042] High temperature leveling agent DM-2110N: 0.3g / L

[0043] Sodium sulfate: 30g / L

[0044] Soda ash: 10g / L

[0045] Glacial acetic acid: 0.4g / L

[0046] pH value is adjusted to 4.5-5.0

[0047] Third step: reduction washing:

[0048] DM-8931: 2g / L

[0049] NaOH: 1g / L

[0050] Fixing in the fourth step:

[0051] DM-2518: 3g / L, 1:10, 40°C for 20min, dehydration, drying.

[0052] Note: control the temperature rising rate at 30-60°C to avoid color mottle caused by rapid temperature rising.

[0053] The specific new process of short flow dyeing of dark polyester-cotton knitted fabric is shown in Figure 1 .

[0054] Example Two

[0055] The new process of short flow dyeing of dark polyester-cotton knitted fabric in this example is dyeing on polyester-cotton interwoven fabric (65% / 35%), the specific steps are as follows:

[0056] First step: pretreatment of polyester-cotton interwoven fabric

[0057] Formulation and process: DM-2022: 3g / L, 1:10, 40°C for 30min, neutralization and washing.

[0058] Second step: disperse active one-bath dyeing

[0059] Formulation and process:

[0060] Disperse scarlet S-2GFL: 2.5% (O.W.F)

[0061] Active red HE-3B: 3.5% (O.W.F)

[0062] Active red HE-R: 0.5% (O.W.F)

[0063] High temperature leveling agent DM-2110N: 0.5g / L

[0064] Sodium sulfate: 25g / L

[0065] Soda ash: 10g / L

[0066] Glacial acetic acid: 0.4g / L

[0067] pH value is adjusted to 4.5-5.0

[0068] Third step: reduction washing

[0069] DM-8931: 2g / L

[0070] NaOH: 1g / L

[0071] Fourth step: fixing

[0072] DM-2518: 3g / L, 1:10, 40℃ for 20min, dehydration, drying.

[0073] Note: In the control of temperature rate of 30-60℃, avoid the color of cotton dyeing caused by rapid heating.

[0074] Specific dark polyester cotton knitted fabric short process dyeing new process is Figure 1 .

[0075] Soaping fastness:

[0076] Test the washing fastness of polyester cotton knitted fabric dyed by example 1-2 respectively, the test standard is "(GB / T3921-C(3)) textile color fastness test soaping fastness", the results are shown in table 2.

[0077] Table 2 soaping fastness after dyeing of two examples

[0078] Bit / level Color change Acetate Cotton Nylon Polyester Acrylic Wool Example 1 4 4-5 3-4 4-5 4-5 4-5 4-5 Example 2 4-5 4-5 4 4 4-5 4-5 4-5

[0079] K / S value:

[0080] Test the K / S value of polyester cotton knitted fabric dyed by example 1-2 respectively, and compare with traditional process, the results are shown in Figure 3 and Figure 4 .

Claims

1. A short process dyeing method of dark colored polyester-cotton knitted fabric, characterized by The method comprises the following steps: S1) pretreating the polyester-cotton knitted fabric without scouring, deoiling and bleaching; S2) adjusting the pH value of the mixed dye bath, one-bath dyeing of the polyester-cotton fabric with active and disperse dyes, and water washing; S3) reduction cleaning, and water washing; In step S1, the pretreatment of the polyester-cotton fabric: the pretreatment agent DM-2022 is 3-5 g / L, NaOH is 1-2 g / L, the penetrating agent DM-1260 is 2-3 g / L, the dyeing is carried out at room temperature, the temperature rising speed is 1-2 ℃ / min, the bath ratio is 1:5-10, the temperature is raised to 40-60 ℃ and kept for 20-40 min, and then the fabric is washed with water at room temperature before dyeing; In step S2, one-bath dyeing of the polyester-cotton fabric: the active dye is X%, the disperse dye is Y%, the initial pH value is adjusted to 4.5-5.0, the high-temperature leveling agent DM-2110N is 0.3-0.6 g / L, the sodium sulfate is 20-30 g / L, the dyeing is carried out at room temperature, the temperature rising speed is 1-2 ℃ / min, the bath ratio is 1:5-10, the temperature is raised to 130 ℃ and kept for 20-40 min, the temperature is then lowered to 70 ℃, 5-10 g / L of pure soda is added, kept for 20 min, drained, and washed with water; In step S3, reduction cleaning: the reduction cleaning agent DM-8931 is 12 g / L, NaOH is 1 g / L, the temperature rising speed is 2 ℃ / min, the bath ratio is 1:5-10, and the temperature is raised to 80 ℃ and kept for 20 min, then drained and washed with water.

2. The process for low p H short flow dyeing of dark colored polyester-cotton knits as claimed in claim 1 wherein: The pretreatment agent DM-2022 is a complex of high-molecular cationic polymers.

3. The process for low p H value short flow dyeing of dark colored polyester-cotton knitted fabric as claimed in claim 2 wherein: The pretreatment agent DM-2022 comprises one or more combinations of epoxytrimethylamine quaternary ammonium compound, polyepoxy compound, mono-active mono-quaternary ammonium salt, mono-active di-quaternary ammonium salt, mono-active di-quaternary ammonium salt, 3-chloro-2-hydroxypropyltrimethylammonium chloride, polyamide chloro-epoxy propane resin, chitosan, modified starch, polyamine polymer, and polycationic polymer.

4. The process for low p H value short flow dyeing of dark colored polyester-cotton knits as claimed in claim 3 wherein: The non-ionic penetrating agent DM-1260 comprises one or more combinations of polyoxyethylene sorbitan ester, polyoxyethylene alkyl phenol ether, polyoxyethylene fatty alcohol ether, polyoxyethylene polyoxypropylene block copolymer, polyoxyethylene fatty acid ester, and alkyl glycoside.

5. The process for low p H value short flow dyeing of dark colored polyester-cotton knits as claimed in claim 4 wherein: The active dye is a combination of one or more of monochlorotriazine active dye, dichlorotriazine active dye, bis-monochlorotriazine active dye, and monochlorotriazine / vinyl sulfone bis-active group active dye.

6. The process for low p H value short flow dyeing of deep colored polyester-cotton knits as claimed in claim 4 wherein: The reduction cleaning agent DM-8931 is a complex of multiple reducing agents, and does not contain sulfur compared with sodium dithionite.

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