A method for homochromatic dyeing of a cotton-containing blended fabric

Abstract

The application relates to a fabric dyeing process, in particular to a same-color dyeing method of a cotton-containing blended fabric, which preparation method comprises pretreatment, modification and dyeing; the cotton-containing blended fabric is first subjected to dust and impurity removal treatment, then is soaked in a modification solution system containing a cationic modifier methyl acryloyloxyethyl trimethyl ammonium chloride (DMC) and an initiator, is heated to 10-60 DEG C for reaction for 30-180 min to modify the fabric, and the cotton-containing blended modified fabric is obtained; and then the modified fabric is subjected to washing and drying, dyeing and soaping to obtain the cotton-containing blended same-color modified fabric. The cotton-containing blended fabric is modified by using a cationic group, the interaction force between anionic active dyes and cotton fibers is increased, the dyeability of the cotton fibers of the blended components is improved, the cotton component dyeing is increased, the color difference of the cationic blended fabric is reduced, and the same-color performance of the blended fabric is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a fabric dyeing process, in particular to a same-color dyeing method for a cotton-containing blended fabric. BACKGROUND

[0002] With the development of society, fabrics made of single fiber as raw material are less and less, and blended fabrics of multiple fibers are more and more to meet market demand. Cotton-containing blended fabrics have the advantages of dimensional stability of cotton and drape and wear resistance of modal, and overcome the shortcomings of their respective wearability, showing crispness and smoothness, and are favored by the market. However, it is challenging to produce blended fabrics with good color uniformity and high dyeing rate by an effective and simple method.

[0003] Cotton-containing blended fabrics are favored by consumers in the dyeing and finishing process due to the soft and comfortable touch of modal fiber and excellent moisture absorption. However, when dyeing modal fiber, the dyeing compatibility of other fibers blended with it must be considered. Generally, dyes suitable for the fibers blended with modal are selected for dyeing. For example, when dyeing modal / cotton blended fabrics, reactive dyes suitable for cotton fiber are usually selected. However, due to the differences in physical and chemical properties between modal fiber and cotton fiber, there is a significant difference in dyeing effect in the same bath dyeing process. The dyeing rate of reactive dyes on modal fiber is higher, and it is easier to dye, and the initial dyeing rate of reactive dyes on modal fiber is also higher, which leads to the phenomenon that the color of the blended fabric may not be uniform, showing "white core" or "flower gray" effect. SUMMARY

[0004] To solve the problem of uneven color of cotton-containing blended fabrics in the dyeing and finishing process, the present application provides a preparation method for a cotton-containing blended same-color modified fabric. In this method, the surface of the fiber is modified and pretreated to produce oxygen free radicals, thereby improving the dyeing rate and achieving good color uniformity. The modification method is simple, non-toxic, environmentally friendly, and has less pollution.

[0005] The technical solution adopted by the present application to solve the technical problems is:

[0006] A same-color dyeing method for a cotton-containing blended fabric, comprising the following steps:

[0007] 1) Pretreatment: dust and impurity removal treatment is performed on the cotton-containing blended fabric;

[0008] 2) Modification: the cotton-containing blended fabric pretreated in step 1) is soaked in a modification solution system containing a cationic modifier, methyl acryloyl ethyl trimethyl ammonium chloride (DMC) and an initiator, heated to 10-60℃ for 30-180min for modification of the fabric, to obtain a cotton-containing blended modified fabric;

[0009] In the modification solution system, the concentration of DMC is 5-50 g / L, the initiator is potassium persulfate and sodium bisulfite, the molar ratio of potassium persulfate and sodium bisulfite is 1:0.9-1.2; the mass ratio of potassium persulfate and DMC is 0.10-0.35;

[0010] 3) Dyeing: washing, drying, dyeing and soaping of the cotton-containing blended modified fabric obtained in step 2) to obtain a cotton-containing blended homochromatic modified fabric.

[0011] The modification pretreatment of the fabric to be dyed comprises the following two steps: first step, the fabric is treated by a redox initiation system composed of sodium bisulfite (as a reducing agent) and potassium persulfate (as an oxidizing agent) to generate oxygen free radicals on the surface of the fabric; second step, methyl methacryloyloxyethyl trimethyl ammonium chloride (DMC) monomers are grafted onto the cellulose molecules of the fabric. In the present application, the cotton fabric is treated with potassium persulfate and sodium bisulfite at the same time to generate oxygen free radicals on the surface of the fabric, and the DMC monomers are grafted onto the cotton fibers through the oxygen free radicals to carry out DMC graft copolymerization. There is a chemical reaction between the reactive dyes and the cationic cellulose fabric. The introduction of quaternary ammonium groups on the cellulose fabric promotes the adsorption of reactive dyes under electrostatic attraction, and increases the chemical crosslinking between the reactive dyes and the cationic cellulose fabric. The chemical bond between the reactive dyes and the fiber is changed from covalent bond to electrostatic attraction + covalent bond, which is beneficial to the diffusion and fixation of the reactive dyes.

[0012] Preferably, the bath ratio in the modification of step 2) is 1:30-40.

[0013] Preferably, the cotton-containing blended fabric in step 1) is blended with one or both of cotton fibers and viscose fibers, modal fibers.

[0014] Preferably, the pretreatment step in step 1) is: water is added at a bath ratio of 1:200-300, the temperature is raised to 90-95℃, and the temperature is kept for 10-15 minutes, and then dewatering and drying are carried out.

[0015] Preferably, in step 2), the molar ratio of potassium persulfate and sodium bisulfite is 1:1.

[0016] Preferably, in the modification solution system, the concentration of DMC is 20-50 g / L, and after comprehensive consideration, the optimal concentration is 20 g / L.

[0017] Preferably, in step 2), the modification temperature is 30-40℃ and the modification time is 110-125 min. Under this parameter condition, the dye uptake, color fixation rate and reaction rate are all high. Preferably, the modification temperature is 30℃ and the modification time is 120 min.

[0018] As preferred, in step 2), the mass ratio of potassium persulfate to DMC in the modified solution system is 0.25-0.30. With the gradual increase of the mass ratio of potassium persulfate to DMC, the dye uptake fluctuates, the color fixation rate increases rapidly first and then remains stable, the reaction rate increases first and then decreases, and the effect is optimal when the mass ratio of potassium persulfate to DMC is 0.25-0.30.

[0019] As preferred, the washing and dehydration process in step 3) is specifically as follows: water is added at a bath ratio of 1:20-30, water washing is performed at 30-50 DEG C for 10-15 minutes, dehydration is performed at a speed of 200 r / min for 4-5 minutes, and drying is performed. As a preferred technical solution, water is added at a bath ratio of 1:20.

[0020] As preferred, the dyeing process in step 3) is specifically as follows: water is added at a bath ratio of 1:20-30, reactive dyes are added, pre-dyeing is performed at 25-35 DEG C for 20-25 minutes, then sodium sulfate is added for after-dyeing for 20-25 minutes, the temperature is increased to 60 DEG C±2 DEG C at a rate of 2 DEG C / min, sodium carbonate is added for color fixation, and the temperature is maintained for 50-60 minutes, and then the temperature is decreased to 30 DEG C±2 DEG C at a rate of 2 DEG C / min and the fabric is taken out; the amount of sodium sulfate is 8-12 g / L, and the amount of sodium carbonate is 15-17 g / L. Common reactive dyes can be used in dyeing, and the amount of the reactive dyes is 1-4 (% ) o.w.f. As a further preferred technical solution, water is added at a bath ratio of 1:20, pre-dyeing is performed at 30 DEG C for 20 minutes, after-dyeing is performed for 20 minutes, the amount of sodium sulfate is 10 g / L, the amount of sodium carbonate is 16 g / L, and the amount of the reactive dyes is 3 (% ) o.w.f.

[0021] As preferred, the soaping process in step 3) is as follows: water is added at a bath ratio of 1:20-30, soaping agent is added, and soaping is performed at 80-90 DEG C for 10-15 minutes, and then dehydration is performed at a speed of 100 r / min for 10-20 minutes. The soaping agent can be selected from conventional agents in the field, and the amount of the soaping agent is 1-2 g / L. As a preferred technical solution, water is added at a bath ratio of 1:20.

[0022] A cotton-containing blended homochromatic modified fabric prepared by the preparation method.

[0023] The cotton-containing blended fabric is modified by using cationic groups to prepare a blended modified fabric, the modified blended fabric mainly increases the interaction force between anionic reactive dyes and cotton fibers, improves the dyeability of the cotton fibers in the blended components, increases the dyeing of the cotton components, reduces the color difference of the cationic blended fabric, and improves the homochromatic performance of the blended fabric.

[0024] In the present application, using methacryloyloxyethyl trimethyl ammonium chloride as a cationic modifier makes the dyeing condition mild, changes the disadvantage of changing the light color of modal cotton in conventional cotton / modal blended fabric in one bath dyeing, and has a better dyeing effect on cotton fiber than modal fiber, so as to realize the same color dyeing.

[0025] The present application adjusts the color of the blended modified fabric by screening of the dye, adjusts the dyeing depth of the blended modified fabric by the concentration of the dyeing solution, adjusts the color light of the blended modified fabric by the amount of the dye, controls the modification degree of the fabric by the cationic grafting reaction of methacryloyloxyethyl trimethyl ammonium chloride and the rotating speed of the stirring paddle.

[0026] The present application has the following beneficial effects:

[0027] 1. Compared with the conventional untreated blended fabric, the K / S value and the fixation rate of the blended fabric treated by the methacryloyloxyethyl trimethyl ammonium chloride cationic agent are obviously improved, the rubbing color fastness and the soaping color fastness are also maintained, the dyeing uniformity and the same color effect of the fabric are obvious, and the color tone difference between different blended fabrics after fabric dyeing can be effectively reduced.

[0028] 2. The same color uniformity of the blended modified fabric can be adjusted according to the proportion relationship of the initiator and the methacryloyloxyethyl trimethyl ammonium chloride, the concentration of the methacryloyloxyethyl trimethyl ammonium chloride, the modification temperature and the modification time, but the overall blended modified fabric preparation method is unchanged.

[0029] 3. The preparation method of the present application is simple, clean and has less pollution. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0031] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of a feature, step, operation, device, component and / or combination thereof.

[0032] The application will be further described in conjunction with specific examples. The following examples are only for the purpose of explaining the application, but do not constitute a limitation on the application. The test samples and test procedures used in the following examples include the following (if the specific conditions of the experiments are not specified in the examples, the general conditions or the conditions recommended by the reagent company are used; the reagents, consumables, etc. used in the following examples can be obtained from commercial channels if not otherwise specified).

[0033] The reagents used in the following examples were obtained from Shanghai Maikelin Biochemical Technology Co., Ltd. Potassium sulfite, sodium bisulfate, and methacryloyloxyethyl trimethyl ammonium chloride solution (75%) were purchased from Shanghai Maikelin Biochemical Technology Co., Ltd. The soaping agent was TF-130A purchased from Sinopharm Chemical Co., Ltd.

[0034] The cotton-containing blended fabric used in each of the following examples was obtained by blending cotton fibers, viscose fibers, and modal fibers at a mass ratio of 2:1:1.

[0035] The detection method of dye uptake, color fixation rate, and reaction rate: the ratio of the dye adsorbed on the fiber after dyeing to the initial dye in the dye bath can be represented by three parameters, namely: dye uptake E%, color fixation rate F%, and reaction rate R%. ① Dye uptake E%: the ratio of the dye in the dyed fiber to the initial dye in the dye bath. ② Color fixation rate F%: after removing the unstable adsorbed dye on the fiber by soaping, the ratio of the final stable adsorbed dye content on the fiber to the initial dye in the dye bath. ③ Reaction rate R%: the ratio of the dye that reacts with the fiber in a chemical bond to the adsorbed dye on the fiber. The calculation formulas of the above three parameters are as follows:

[0036] E% = (1-A2 / A1) x 100% (1-1)

[0037] F% = (E-A3 / A1) x 100% (1-2)

[0038] R% = (F / E) x 100% (1-3)

[0039] In the above three equations, A1, A2, and A3 refer to the absorbance of the dye bath before dyeing, the dye solution after dyeing, and the soaping solution after soaping, respectively, measured at the maximum absorption wavelength λ max of the dye bath using a UV spectrophotometer UV 2600 (Shimadzu Corporation).

[0040] Example 1:

[0041] A method for homochromatic dyeing of a cotton-containing blended fabric, comprising the following steps:

[0042] 1) Pre-treatment of the cotton-containing blended fabric to remove dust and impurities;

[0043] The dust-removing and impurity-removing pretreatment process is as follows: water is added at a bath ratio of 1:200, the temperature is raised to 90°C, and the temperature is kept for 10 minutes, and then dehydration and drying are performed;

[0044] 2) The cotton-containing blended fabric after the pretreatment in step 1) is immersed in a modification solution system containing a cationic modifier, methacryloyloxyethyl trimethyl ammonium chloride (DMC) and an initiator, heated to 40°C for 90 minutes for modification of the fabric, and a cotton-containing blended modified fabric is obtained;

[0045] In the modification solution system, the concentration of DMC is 40 g / L, the initiator is potassium persulfate (K2S2O8) and sodium bisulfite (NaHSO3), the molar ratio of potassium persulfate to sodium bisulfite is 1:1, and the mass ratio of potassium persulfate to DMC is 0.10.

[0046] The bath ratio is 1:40, that is, 40 mL of water is added to 1 g of the modified fabric in the modification solution system.

[0047] 3) The cotton-containing blended modified fabric obtained in step 2) is washed, dried, dyed, and soaped to obtain a cotton-containing blended homochromatic modified fabric;

[0048] The process conditions for washing and drying are as follows: water is added at a bath ratio of 1:20, water washing is performed at 40°C for 15 minutes, dehydration is performed at a speed of 200 r / min for 5 minutes, and then drying is performed.

[0049] The dyeing process conditions are as follows: the cotton-containing blended modified fabric is placed in a dyeing vat, water is added at a bath ratio of 1:20, active yellow 176-M 3(%)o.w.f. is added, pre-dyeing is performed at 30°C for 20 minutes, then sodium sulfate is added at a proportion of 10 g / L for after-dyeing for 20 minutes, the temperature is raised to 60°C at a rate of 2°C / min, sodium carbonate is added at a proportion of 16 g / L for dye fixation, the temperature is kept for 50 minutes, then the temperature is lowered to 30°C at a rate of 2°C / min, and then the fabric is taken out.

[0050] The process conditions for soaping are as follows: water is added at a bath ratio of 1:20, soaping agent is added, and then soaping is performed at 90°C for 10 minutes, and dehydration is performed at a speed of 100 r / min for 10 minutes. The amount of the soaping agent used is 1 g / L.

[0051] Example 2:

[0052] A homochromatic dyeing method for a cotton-containing blended fabric, the steps of which are the same as those of Example 1, except that the mass ratio of potassium persulfate to methacryloyloxyethyl trimethyl ammonium chloride is 0.15.

[0053] Example 3:

[0054] A homochromatic dyeing method for a cotton-containing blended fabric, the steps of which are the same as those of Example 1, except that the mass ratio of potassium persulfate to methacryloyloxyethyl trimethyl ammonium chloride is 0.20.

[0055] Example 4:

[0056] A same-color dyeing method of a cotton-containing blended fabric, the steps of which are the same as those of Example 1, except that the mass ratio of potassium persulfate to methacryloyloxyethyl trimethyl ammonium chloride is 0.25.

[0057] Example 5:

[0058] A same-color dyeing method of a cotton-containing blended fabric, the steps of which are the same as those of Example 1, except that the mass ratio of potassium persulfate to methacryloyloxyethyl trimethyl ammonium chloride is 0.30.

[0059] Example 6:

[0060] A same-color dyeing method of a cotton-containing blended fabric, the steps of which are the same as those of Example 1, except that the mass ratio of potassium persulfate to methacryloyloxyethyl trimethyl ammonium chloride is 0.35.

[0061] The cotton-containing blended same-color modified fabric prepared in Examples 1-6 was detected for dye uptake, color fixation rate, and reaction rate, and the specific detection results are shown in Table 1.

[0062] Table 1 Dye uptake, color fixation rate, and reaction rate of cotton-containing blended same-color modified fabric of Examples 1-6

[0063] [C (K2S2O8) / C (DMC) ]]> % dye uptake % fixation % reactivity Example 1 0.10 84.7 73.7 83.4 Example 2 0.15 92.5 83.8 83.9 Example 3 0.20 91.4 83.6 88.1 Example 4 0.25 92.6 85.1 90.8 Example 5 0.30 93.1 85.2 90.5 Example 6 0.35 91.6 83.5 90.1

[0064] As can be seen, as the mass ratio of potassium persulfate to methacryloyloxyethyl trimethyl ammonium chloride gradually increases, the dye uptake fluctuates, the color fixation rate first rapidly increases and then remains stable, and the reaction rate first increases and then decreases. In consideration of the overall situation, the mass ratio of potassium persulfate to methacryloyloxyethyl trimethyl ammonium chloride is preferably 0.30.

[0065] Example 7:

[0066] A same-color dyeing method of a cotton-containing blended fabric, the steps of which are as follows:

[0067] 1) Dust and impurity removal pretreatment of the cotton-containing blended fabric;

[0068] The dust and impurity removal pretreatment process is: water is added at a bath ratio of 1:200, the temperature is raised to 90°C, and the temperature is maintained for 10 minutes, followed by dehydration and drying;

[0069] 2) The cotton-containing blended fabric pretreated in step 1) is immersed in a modified solution system containing the cationic modifier methacryloyloxyethyl trimethyl ammonium chloride (DMC) and the initiator under a nitrogen atmosphere, heated to 40°C, and reacted for 90 min to modify the fabric, obtaining a cotton-containing blended modified fabric;

[0070] In the modified solution system, the concentration of DMC is 5 g / L, the initiator is potassium persulfate (K2S2O8) and sodium bisulfite (NaHSO3), the molar ratio of potassium persulfate and sodium bisulfite is 1:1, and the mass ratio of potassium persulfate to DMC is 0.30;

[0071] The bath ratio is 1:40.

[0072] 3) The cotton-containing blended modified fabric obtained in step 2) is washed, dried, dyed, and soaped to obtain a cotton-containing blended homochromatic modified fabric;

[0073] The process conditions for washing and drying are as follows: water is added at a bath ratio of 1:20, washing is performed at 40°C for 15 minutes, dehydration is performed at a speed of 200 r / min for 5 minutes, and drying is performed;

[0074] The dyeing process conditions are as follows: the cotton-containing blended modified fabric is placed in a dyeing vat, water is added at a bath ratio of 1:20, active yellow 176-M 3(%) o.w.f. is added, pre-dyeing is performed at 30°C for 20 minutes, then sodium sulfate is added at a proportion of 10 g / L for after-dyeing for 20 minutes, the temperature is increased to 60°C at a rate of 2°C / min, sodium carbonate is added at a proportion of 16 g / L for color fixing, and the temperature is maintained for 50 minutes, then the temperature is decreased to 30°C at a rate of 2°C / min, and the fabric is taken out;

[0075] The process conditions for soaping are as follows: water is added at a bath ratio of 1:20, soaping agent is added, and soaping is performed at 90°C for 10 minutes, and dehydration is performed at a speed of 100 r / min for 10 minutes. The amount of soaping agent used is 1 g / L.

[0076] Example 8:

[0077] A homochromatic dyeing method for a cotton-containing blended fabric, the steps of which are the same as those of example 7, except that the concentration of methacryloyloxyethyl trimethyl ammonium chloride is 10 g / L.

[0078] Example 9:

[0079] A homochromatic dyeing method for a cotton-containing blended fabric, the steps of which are the same as those of example 7, except that the concentration of methacryloyloxyethyl trimethyl ammonium chloride is 20 g / L.

[0080] Example 10:

[0081] A homochromatic dyeing method for a cotton-containing blended fabric, the steps of which are the same as those of example 7, except that the concentration of methacryloyloxyethyl trimethyl ammonium chloride is 30 g / L.

[0082] Example 11:

[0083] A homochromatic dyeing method for a cotton-containing blended fabric, the steps of which are the same as those of example 7, except that the concentration of methacryloyloxyethyl trimethyl ammonium chloride is 40 g / L.

[0084] Example 12:

[0085] A same-color dyeing method of a cotton-containing blended fabric, the steps of which are the same as those of Example 7, except that the concentration of methacryloyloxyethyl trimethyl ammonium chloride is 50 g / L.

[0086] The dye-uptake, color-fixation and reaction rate of the cotton-containing blended same-color modified fabric prepared in Examples 7-12 were detected, and the specific detection results are shown in Table 2.

[0087] Table 2 Dye-uptake, color-fixation and reaction rate of cotton-containing blended same-color modified fabric of Examples 7-12

[0088] [C (DMCg / L) ]]> % dye uptake % fixation % reactivity Example 7 5 75.8 63.2 83.4 Example 8 10 81.2 68.1 83.9 Example 9 20 90.1 80.7 89.5 Example 10 30 91.9 83.5 90.8 Example 11 40 92.1 83.4 90.5 Example 12 50 93.6 84.3 90.1

[0089] As can be seen from Table 2, with the increase of the concentration of methacryloyloxyethyl trimethyl ammonium chloride, the dye-uptake, color-fixation and reaction rate of the cotton-containing blended same-color modified fabric are gradually increased. Considering the cost factor, the concentration of methacryloyloxyethyl trimethyl ammonium chloride is preferably 20 g / L.

[0090] Example 13:

[0091] A same-color dyeing method of a cotton-containing blended fabric, the steps of which are as follows:

[0092] 1) The cotton-containing blended fabric is pretreated by removing dust and impurities; the dust-removing and impurity-removing pretreatment process is as follows: water is added at a bath ratio of 1:200, the temperature is raised to 90°C, and the temperature is maintained for 10 minutes, followed by dehydration and drying;

[0093] 2) The cotton-containing blended fabric pretreated in step 1) is soaked in a modification solution system containing a cationic modifier methacryloyloxyethyl trimethyl ammonium chloride (DMC) and an initiator under a nitrogen atmosphere, heated to 10°C and maintained for 90 minutes for modification of the fabric, to obtain a cotton-containing blended modified fabric;

[0094] In the modification solution system, the concentration of DMC is 20 g / L, the initiator is potassium persulfate (K2S2O8) and sodium bisulfite (NaHSO3), and the molar ratio of potassium persulfate to sodium bisulfite is 1:1; the mass ratio of potassium persulfate to DMC is 0.30;

[0095] The bath ratio is 1:40.

[0096] 3) The cotton-containing blended modified fabric obtained in step 2) is washed and dried, dyed and soaped to obtain a cotton-containing blended same-color modified fabric; the process conditions for washing and drying are as follows: water is added at a bath ratio of 1:20, washed at 40°C for 15 minutes, dehydrated at a speed of 200 r / min for 5 minutes, and dried.

[0097] The dyeing process conditions are as follows: the cotton-containing blended modified fabric is put into a dyeing vat, water is added at a bath ratio of 1:20, reactive yellow 176-M 3(%) o.w.f. is added, pre-dyeing is carried out at 30°C for 20 minutes, then sodium sulfate is added at a proportion of 10 g / L for after-dyeing for 20 minutes, the temperature is increased to 60°C at a rate of 2°C / min, sodium carbonate is added at a proportion of 16 g / L for fixation, the temperature is kept for 50 minutes, then the temperature is decreased to 30°C at a rate of 2°C / min, and the fabric is taken out;

[0098] The soaping process conditions are as follows: water is added at a bath ratio of 1:20, soaping agent is added, and soaping is carried out at 90°C for 10 minutes, and dehydration is carried out at 100 r / min for 10 minutes.

[0099] Example 14:

[0100] A same-color dyeing method for a cotton-containing blended fabric, the steps of which are the same as those of example 13, except that the modification temperature in step 3) is 20°C.

[0101] Example 15:

[0102] A same-color dyeing method for a cotton-containing blended fabric, the steps of which are the same as those of example 13, except that the modification temperature in step 3) is 30°C.

[0103] Example 16:

[0104] A same-color dyeing method for a cotton-containing blended fabric, the steps of which are the same as those of example 13, except that the modification temperature in step 3) is 40°C.

[0105] Example 17:

[0106] A same-color dyeing method for a cotton-containing blended fabric, the steps of which are the same as those of example 13, except that the modification temperature in step 3) is 50°C.

[0107] Example 18:

[0108] A same-color dyeing method for a cotton-containing blended fabric, the steps of which are the same as those of example 13, except that the modification temperature in step 3) is 60°C.

[0109] The cotton-containing blended same-color modified fabric prepared in examples 13-18 is detected for dye uptake, fixation rate, and reaction rate, and the specific detection results are shown in table 3.

[0110] Table 3 Dye uptake, fixation rate, and reaction rate of cotton-containing blended same-color modified fabric in examples 13-18

[0111]

[0112]

[0113] As can be seen from Table 3, with the increase of temperature, the dye-uptake, fixation rate and reaction rate first increase and then decrease. In comprehensive consideration, the preferred temperature is 30℃.

[0114] Example 19:

[0115] A method for homochromatic dyeing of a cotton-containing blended fabric, comprising the following steps:

[0116] 1) Pre-treating the cotton-containing blended fabric by removing dust and impurities; the pre-treatment process is as follows: water is added at a bath ratio of 1:200, the temperature is raised to 90℃, and the fabric is kept at this temperature for 10 minutes, then dehydrated and dried;

[0117] 2) Soaking the cotton-containing blended fabric pre-treated in step 1) in a modified solution system containing cationic modifier methylacryloyloxyethyl trimethyl ammonium chloride (DMC) and initiator under a nitrogen atmosphere, heating to 30℃ and keeping for 30 minutes to modify the fabric, obtaining a modified cotton-containing blended fabric;

[0118] In the modified solution system, the concentration of DMC is 20g / L, the initiator is potassium persulfate (K2S2O8) and sodium bisulfite (NaHSO3), the molar ratio of potassium persulfate to sodium bisulfite is 1:1, and the mass ratio of potassium persulfate to DMC is 0.30;

[0119] The bath ratio is 1:40;

[0120] 3) Washing and drying the modified cotton-containing blended fabric obtained in step 2), dyeing and soaping to obtain a homochromatic modified cotton-containing blended fabric; the process conditions for washing and drying are as follows: water is added at a bath ratio of 1:20, washed at 40℃ for 15 minutes, dehydrated at a speed of 200r / min for 5 minutes, and dried;

[0121] The process conditions for dyeing are as follows: the modified cotton-containing blended fabric is put into a dyeing vat, water is added at a bath ratio of 1:20, reactive yellow 176-M 3(%)o.w.f. is added, pre-dyeing is carried out at 30℃ for 20 minutes, then sodium sulfate is added at a proportion of 10g / L for after-dyeing for 20 minutes, the temperature is raised to 60℃ at a rate of 2℃ / min, sodium carbonate is added at a proportion of 16g / L for fixation, the temperature is kept for 50 minutes, then the temperature is lowered to 30℃ at a rate of 2℃ / min, and the fabric is taken out;

[0122] The process conditions for soaping are as follows: water is added at a bath ratio of 1:20, soaping agent is added, and soaping is carried out at 90℃ for 10 minutes, and dehydrated at a speed of 100r / min for 10 minutes. The amount of soaping agent used is 1g / L.

[0123] Example 20:

[0124] A method for homochromatic dyeing of a cotton-containing blended fabric, comprising the same steps as in Example 13, except that the modification time in step 3) is 60 minutes.

[0125] Example 21:

[0126] A method for homochromatic dyeing of cotton-containing blended fabric, the steps of which are the same as those of Example 13, except that the modification time in step 3) is 90 min.

[0127] Example 22:

[0128] A method for homochromatic dyeing of cotton-containing blended fabric, the steps of which are the same as those of Example 13, except that the modification time in step 3) is 120 min.

[0129] Example 23:

[0130] A method for homochromatic dyeing of cotton-containing blended fabric, the steps of which are the same as those of Example 13, except that the modification time in step 3) is 150 min.

[0131] Example 24:

[0132] A method for homochromatic dyeing of cotton-containing blended fabric, the steps of which are the same as those of Example 13, except that the modification time in step 3) is 180 min.

[0133] The cotton-containing blended homochromatic modified fabric prepared in Examples 19-24 was detected for dye uptake, color fixation rate, and reaction rate, and the specific detection results are shown in Table 3.

[0134] Table 4 Dye uptake, color fixation rate, and reaction rate of cotton-containing blended homochromatic modified fabric of Examples 19-24

[0135] t (min) % dye uptake % fixation % reactivity Example 19 30 81.3 76.0 93.5 Example 20 60 82.3 77.2 93.8 Example 21 90 88.7 80.8 91.1 Example 22 120 93.0 86.5 93.0 Example 23 150 92.7 85.4 92.1 Example 24 180 91.3 81.5 89.3

[0136] As can be seen from Table 4, as the modification time increases, the dye uptake and color fixation rate first increase and then decrease, and the reaction rate fluctuates. In consideration of the overall situation, the preferred modification time is 120 min.

[0137] Comparative Example 1: (without fabric modification treatment)

[0138] A method for preparing a cotton-containing blended homochromatic fabric, the steps of which are as follows:

[0139] 1) The cotton-containing blended fabric is pretreated for dust and impurity removal. The dust and impurity removal pretreatment process is: water is added at a bath ratio of 1:200, the temperature is raised to 90°C, and the temperature is maintained for 10 minutes, followed by dehydration and drying;

[0140] 2) dyeing and soaping the cotton-containing blended fabric to obtain a cotton-containing blended fabric with the same color; wherein the dyeing process conditions are as follows: the cotton-containing blended fabric is put into a dyeing vat, water is added at a bath ratio of 1:20, active yellow 176-M 3(%) o.w.f. is added, pre-dyeing is performed at 30°C for 20 min, then sodium sulfate is added at a proportion of 60 g / L for subsequent dyeing for 20 min, the temperature is increased to 60°C at a rate of 2°C / min, sodium carbonate is added at a proportion of 16 g / L for dye fixing, the temperature is kept for 50 min, the temperature is then decreased to 30°C at a rate of 2°C / min, and the cotton-containing blended fabric is taken out;

[0141] The soaping process conditions are as follows: water is added at a bath ratio of 1:20, a soaping agent is added, and soaping is performed at 90°C for 10 min, and dehydration is performed at 100 r / min for 10 min. The amount of the soaping agent used is 1 g / L.

[0142] Comparative Example 2

[0143] A method for dyeing a cotton-containing blended fabric with the same color, comprising the following steps:

[0144] 1) performing dust and impurity removal pretreatment on the cotton-containing blended fabric; the dust and impurity removal pretreatment process is as follows: water is added at a bath ratio of 1:200, the temperature is increased to 90°C, the temperature is kept for 10 min, and dehydration and drying are performed;

[0145] 2) a solution of 2,3-epoxypropyltrimethylammonium chloride (GTA) and a catalyst (NaOH) is prepared at a concentration ratio of 10:1, the cotton-containing blended fabric is immersed in the solution, water is added at a bath ratio of 1:200, then the temperature is increased to 90°C, and the temperature is kept while continuously stirring, so that the 2,3-epoxypropyltrimethylammonium chloride (GTA) is more uniformly distributed on the fibers. The modified fabric is washed with water to remove residual unreacted substances to obtain a cotton-containing blended modified fabric, and the washing process is as follows: water is added at a bath ratio of 1:20, washing is performed at 40°C for 15 min, and dehydration is performed at a rate of 200 r / min for 5 min.

[0146] 3) dyeing and soaping the cotton-containing blended modified fabric obtained in step 2) to obtain a cotton-containing blended modified fabric with the same color; wherein the dyeing process conditions are as follows: the cotton-containing blended modified fabric is put into a dyeing vat, water is added at a bath ratio of 1:20, active yellow 176-M 3(%) o.w.f. is added, pre-dyeing is performed at 30°C for 20 min, then subsequent dyeing is performed for 20 min, the temperature is increased to 60°C at a rate of 2°C / min, sodium carbonate is added at a proportion of 2 g / L for dye fixing, the temperature is kept for 50 min, the temperature is then decreased to 30°C at a rate of 2°C / min, and the cotton-containing blended modified fabric is taken out;

[0147] The soaping process conditions are as follows: water is added at a bath ratio of 1:20, a soaping agent is added, and soaping is performed at 90°C for 10 min, and dehydration is performed at 100 r / min for 10 min.

[0148] Comparative Example 3

[0149] A same-color dyeing method of a cotton-containing blended fabric, comprising the following steps:

[0150] 1) Pre-treating the cotton-containing blended fabric by removing dust and impurities; the pre-treatment process is as follows: water is added at a bath ratio of 1:200, the temperature is raised to 90 DEG C, and the fabric is kept at this temperature for 10 minutes, then dehydrated and dried;

[0151] 2) A certain amount of methacryloyloxyethyl trimethyl ammonium chloride solution (DMC) is dropped into a conical flask by using a dropper, deionized water is added for dissolution to obtain a cationic modifier, and the pre-treated cotton-containing blended fabric in step 1) is immersed in the cationic modifier, and nitrogen gas is introduced to create a nitrogen atmosphere, wherein the bath ratio is 1:20, the concentration of methacryloyloxyethyl trimethyl ammonium chloride is 20 g / L, the modification temperature is 30 DEG C, and the modification time is 120 minutes.

[0152] 3) The modified cotton-containing blended fabric obtained in step 3) is washed, dried, dyed, and soaped to obtain a same-color modified cotton-containing blended fabric, and the specific process conditions are the same as those in Example 1.

[0153] In Comparative Example 4, the initiator is sodium bisulfite

[0154] A same-color dyeing method of a cotton-containing blended fabric, comprising the following steps:

[0155] 1) Pre-treating the cotton-containing blended fabric by removing dust and impurities; the pre-treatment process is as follows: water is added at a bath ratio of 1:200, the temperature is raised to 90 DEG C, and the fabric is kept at this temperature for 10 minutes, then dehydrated and dried;

[0156] 2) In a nitrogen atmosphere, the pre-treated cotton-containing blended fabric in step 1) is immersed in a modification solution system containing a cationic modifier methacryloyloxyethyl trimethyl ammonium chloride (DMC) and an initiator, heated to 30 DEG C for 120 minutes for modification of the fabric to obtain a modified cotton-containing blended fabric;

[0157] In the modification solution system, the concentration of DMC is 20 g / L, the initiator is sodium bisulfite (NaHSO3), and the mass ratio of potassium persulfate to DMC is 0.30;

[0158] The bath ratio is 1:40;

[0159] 3) The modified cotton-containing blended fabric obtained in step 3) is washed, dried, dyed, and soaped to obtain a same-color modified cotton-containing blended fabric, and the specific process conditions are the same as those in Example 1.

[0160] In Comparative Example 5, the initiator is potassium persulfate

[0161] A same-color dyeing method of a cotton-containing blended fabric, the specific method being the same as that in Comparative Example 4, except that the initiator is potassium persulfate (K2S2O8).

[0162] Comparative Example 6:

[0163] A method for homochromatic dyeing of a cotton-containing blended fabric, the specific method being the same as that of Comparative Example 4, except that the modified solution system is a DMC solution with a concentration of 20 g / L, and does not contain an initiator.

[0164] Comparative Example 7:

[0165] A method for homochromatic dyeing of a cotton-containing blended fabric, the specific method being the same as that of Comparative Example 4, except that the modification time is 90 minutes.

[0166] Comparative Example 8:

[0167] A method for homochromatic dyeing of a cotton-containing blended fabric, the specific method being the same as that of Comparative Example 5, except that the modification time is 90 minutes.

[0168] The fabric prepared in Comparative Examples 1-8 and Examples 5, 9, 15, and 22 is subjected to detection of dye-uptake, color fixation, homochromatic balance value, wet rubbing fastness, dry rubbing fastness, and soaping fastness, and the detection results are shown in Table 5. In Table 5, the K / S value and the homochromatic balance value (Q) are determined by using an SF600X Datacolor color spectrometer to measure the K / S value of the fabric, and the ratio of the parallel measurement values at different positions under a D65 light source is the homochromatic balance value.

[0169] Fastness testing: The dry and wet rubbing fastness of the dyed fabric is determined according to the method of GB / T 3920-2008 “Textile Color Fastness Test – Rubbing Color Fastness”, and the staining of the rubbing cloth is rated by using a gray sample card. The discoloration of the sample and the staining of the lining fabric are rated according to the method of GB / T 3921-2008 “Textile Color Fastness Test – Soaping Color Fastness”.

[0170] Table 5

[0171] Item Example 5 Example 9 Example 15 Example 22 Comparative Example 1 Comparative Example 2 % dye uptake 93.1 90.1 92.6 93.0 72.2 90.0 % fixation 85.2 80.7 84.3 83.5 64.5 79.5 Homogeneity balance 0.81 0.85 0.91 0.92 0.67 0.53 Wet rubbing fastness 4 4-5 4 4-5 4 4 Dry rubbing fastness 5 5 4-5 5 4 5 Soaping fastness 4-5 4 4-5 4-5 4 4 Item Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 % dye uptake 77.4 79.3 70.6 79.8 82.3 73.9 % fixation 68.3 69.7 61.4 71.5 73.7 60.7 Homogeneity balance 0.73 0.75 0.64 0.60 0.63 0.62 Wet rubbing fastness 4 4 3 4 4 3～4 Dry rubbing fastness 4 4 3 4 4 4 Soaping fastness 3 4 3 4-5 4 4

[0172] As shown in Table 5, the cotton-containing blended modified fabric prepared under the process conditions of Examples 5, 9, 15, and 22 has good dye-uptake, color fixation, homochromaticity, dry rubbing fastness, wet rubbing fastness, and soaping fastness, and the process conditions of Example 22 are the most preferred.

[0173] As shown in Comparative Example 5 and Comparative Example 1, the dye-uptake and homochromaticity of the blended modified fabric are 20-21% higher than those of the traditional unmodified blended fabric when the concentration ratio of C(K2S2O8) / C(DMC) is 0.30 in the preferred preparation method, and the dry rubbing fastness and wet rubbing fastness of the blended modified fabric can be maintained.

[0174] From comparative example 5 and comparative example 2, it can be seen that the dye-uptake and fixation rate of the DMC blended modified fabric is slightly better than that of the GTA blended modified fabric, and the color uniformity of the DMC blended modified fabric is much higher than that of the GTA blended modified fabric.

[0175] From comparative example 9, 15, 22 and comparative example 1, 2, it can be seen that, in the preferred preparation method, the C(DMC) concentration is 20 g / L, the temperature is 30℃, and the time is 120 min, and then dyeing is performed, and the color balance value of the blended modified fabric is higher than that of the conventional unmodified blended fabric by 0.17-0.25, and higher than that of the general cationic (GTA) modified blended fabric by 0.31-0.39, indicating that the preferred preparation method has greatly improved the dyeing uniformity of the blended fabric compared with the conventional process.

[0176] From comparative example 3-5 and example 22, it can be seen that, after the fabric is pretreated by the modification method of the application to obtain a blended modified fabric and then dyed, the dye-uptake and fixation rate and the color balance value of the blended modified fabric are higher than those of the unmodified blended fabric by 0.17-0.25, and the main reason is that the addition of potassium persulfate or sodium bisulfite alone cannot generate oxygen free radicals in the cellulose fabric, and the DMC grafting effect is poor, and the dyeing uniformity and color matching effect of the blended fabric are low.

[0177] From comparative example 6-8 and example 22, it can be seen that, after the DMC blended modified fabric is prepared, the dye-uptake and fixation rate of the blended modified fabric is higher than that of the unmodified blended fabric by 0.15-0.17, but the fabric color balance value is low, and the main reason is that the addition of sodium sulfate dyeing agent is beneficial to improve the dye-uptake and fixation rate of the modal component in the blended fabric, resulting in increased color difference between cotton and modal, and lower color matching effect of the blended fabric.

[0178] The preparation of the blended modified fabric according to the application can make the blended fabric obtain wet rubbing fastness, dry rubbing fastness and soaping fastness comparable to conventional processes, and also obtain relatively better dyeing uniformity and color matching.

[0179] In the specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0180] The method for homochromatic dyeing of the cotton-containing blended fabric provided by the application is described in detail. The principle and implementation mode of the application are described by using specific examples. The above description of the examples is only used to help understand the method of the application and the core idea thereof. It should be pointed out that, for those skilled in the art, some improvements and modifications can be made to the application without departing from the principle of the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. A method for dyeing cotton blended fabrics in the same color, characterized in that... The method includes the following steps: 1) Pretreatment: Remove dust and impurities from the cotton blended fabric. Add water at a liquor ratio of 1:200-300, heat to 90-95℃, keep warm for 10-15 minutes, then dehydrate and dry. 2) Modification: Under a nitrogen atmosphere, the cotton blended fabric pretreated in step 1) is immersed in a modification solution system containing cationic modifier methacryloyloxyethyltrimethylammonium chloride (DMC) and an initiator, and heated to 30~40℃ for 110~125 min to modify the fabric and obtain the cotton blended modified fabric. In the modified solution system, the concentration of DMC is 5~50 g / L, the initiator is potassium persulfate and sodium bisulfite, the molar ratio of potassium persulfate and sodium bisulfite is 1:1, and the mass ratio of potassium persulfate to DMC is 0.25~0.

30. 3) Dyeing: The cotton-blend modified fabric obtained in step 2) is washed, dried, dyed, and soaped to obtain a cotton-blend modified fabric of the same color. Specifically, the process is as follows: water is added at a liquor ratio of 1:20-30, reactive dye is added, and pre-dyeing is carried out at 25-35℃ for 20-25 minutes. Then, sodium sulfate is added for further dyeing for 20-25 minutes. The temperature is increased to 60℃±2℃ at a rate of 2℃ / min, sodium carbonate is added for color fixing, and the temperature is maintained for 50-60 minutes. Then, the temperature is decreased to 30℃±2℃ at a rate of 2℃ / min and the fabric is removed. The amount of sodium sulfate used is 8-12 g / L, and the amount of sodium carbonate used is 15-17 g / L.

2. The staining method according to claim 1, characterized in that: The cotton blended fabric mentioned in step 1) is made by blending cotton fibers with one or two of the following: viscose fibers and modal fibers.

3. The staining method according to claim 1, characterized in that: The washing and drying conditions described in step 3) are as follows: water intake at a liquor ratio of 1:20-30, water washing at 30-50℃ for 10-15 minutes, dehydration at a rate of 200r / min for 4-5 minutes, and drying.

4. The staining method according to claim 1, characterized in that: The soaping process described in step 3) is as follows: water is added at a bath ratio of 1:20-30, soaping is performed at 80-90℃ for 10-15 minutes, and then dehydration is performed at 100r / min for 10-20 minutes.

5. A cotton-blend monochromatic modified fabric prepared by the dyeing method according to any one of claims 1-4.

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