A reactive dye printing process for cotton fabric without steaming and washing

Abstract

The application relates to a reactive dye non-steaming and non-washing printing process of cotton fabric, and the process flow is as follows: cotton fabric mercerization, cation modification, printing, and baking fixation; the color paste used for printing contains a fixing agent, and the fixing agent is sodium nicotinate; the product obtained through baking fixation has soft hand feeling, the cloth surface pH value is 6.9-7.2, the dry rubbing fastness is 4-5 levels, the wet rubbing fastness is 3-4 levels, the soaping fastness is 4-5 levels, and the cotton staining is 4-5 levels. The process does not use steaming, and does not need washing, is energy-saving and environment-friendly, the finished product has soft hand feeling, and has good dyeing effect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of dyeing and finishing, and relates to an active dye printing process without steaming and washing for cotton fabric. BACKGROUND

[0002] The existing active dye printing of cotton fabric generally uses baking soda as a fixing agent, and part of urea is added to improve the printing depth. Then, the steaming method is used for fixing, and a large amount of water is needed for subsequent cleaning, which wastes resources and increases the burden of sewage treatment due to the addition of urea.

[0003] CN102493221A discloses a method for printing cotton fabric with active dye with less water, which first grafts and modifies cotton fibers to introduce cationic groups into the cotton fiber molecules, increases the adsorption rate of anionic active dyes, increases the dyeing (fixing) rate of active dyes, and improves color fastness. At the same time, urea and baking soda are used as fixing agents, a low solid content synthetic thickening agent is used as the original paste of printing paste to reduce the solid content of the paste, and a reinforcing agent and a softening agent are added to the paste to further improve the color fastness of the printed fabric and improve the hand feeling. The printed fabric can be washed without water, but the fabric surface is prone to yellowing and the pH value is high because urea and baking soda are used as fixing agents.

[0004] CN114808486A discloses an energy-saving and low-consumption steaming-free printing and fixing process for cotton fabric, which uses urea and baking soda as fixing agents. The printed and dried cotton fabric is passed through the gap between the first heat pressing roller and the first liquid feeding roller in the first heat pressing assembly to complete the padding of the fixing liquid, and the temperature of the first heat pressing roller is 75-85℃. The cotton fabric passing through the first heat pressing assembly is further passed through the gap between the second heat pressing roller and the second liquid feeding roller in the second heat pressing assembly to complete the padding of the protective liquid. The temperature of the second heat pressing roller is 55-65℃. However, this method not only uses urea and baking soda as fixing agents, which can cause the fabric surface to yellow and the pH value to be high, but also uses a multi-pass roller process for drying, which has a long process flow and wastes energy.

[0005] CN110172844B discloses an active dye printing method for cotton textiles, which changes the formula of the printing paste in the traditional active dye printing process, adds active dyes and polyvinyl butyral to a mixed solution of ethanol, water and halogenated hydrocarbon, stirs uniformly after heating to obtain an active dye printing paste. Polyvinyl butyral is a high-molecular compound with good fluidity and a high proportion of active hydroxyl groups. The active hydroxyl groups are easily combined with active dye molecules to form chelates, and good fluidity makes the chelates more uniformly dispersed, making the dyeing process of active dyes uniform and fast. The hydroxyl groups, acetyl groups and aldehyde groups contained in the polyvinyl butyral molecules can cross-link with the hydroxyl groups of cotton fabric, thereby effectively enhancing the intermolecular force. However, this method has many components in the printing paste, the cost is high, and subsequent soaping is needed, which wastes water resources.

[0006] Therefore, it is of great significance to study an active dye non-steam and non-washing printing process of cotton fabric to solve the above problems. SUMMARY

[0007] The application aims at solving the problems in the prior art and providing an active dye non-steam and non-washing printing process of cotton fabric.

[0008] To achieve the above object, the application adopts the following technical scheme:

[0009] An active dye non-steam and non-washing printing process of cotton fabric, the process flow is as follows: cotton fabric mercerization, cation modification, printing, baking and color fixing.

[0010] The color paste used for printing contains a color fixing agent, and the color fixing agent is sodium nicotinate.

[0011] The product obtained by baking and color fixing has soft hand feeling, the cloth surface pH value is 6.9-7.2, the dry rubbing fastness is 4-5 levels, the wet rubbing fastness is 3-4 levels, the soaping fastness is 4-5 levels, and the cotton staining is 4-5 levels.

[0012] Good color fastness and neutral cloth surface pH are conditions for realizing non-washing.

[0013] The application ensures that the product obtained by baking and color fixing has high color fastness and does not need to be washed by performing mercerization and cation modification on the cotton fabric and selecting sodium nicotinate as the color fixing agent, and the specific principle is as follows: the structure of cellulose fiber contains a large number of hydroxyl groups, and the fiber surface also presents negative electricity due to ionization in water, and there is charge repulsion between the dye and the fiber, after cationization of the fabric, the fabric surface has positive charge, and has attraction to anion dyes or dye particles adsorbed with anion dispersants, thereby reducing the electrostatic repulsion between the active dye and the cotton fiber, at this time, with the reduction of the distance from the fabric surface, the dye particle concentration will rapidly increase, accelerating the adsorption on the fabric surface and improving the color fixing rate.

[0014] The application ensures that the cloth surface pH of the product obtained by baking and color fixing is neutral by selecting sodium nicotinate as the color fixing agent.

[0015] In addition, the baked and fixed color product does not have color mottle phenomenon, because the printing method is used in the present application, which is different from the padding and dip dyeing method of the prior art. The padding and dip dyeing process is that the dye diffuses from the dyeing solution to the fiber surface, and is adsorbed on the fiber surface. The dye adsorbed on the fiber surface diffuses to the inside of the fiber. The reverse process of adsorption is called desorption. In the dyeing process, adsorption and desorption are carried out at the same time. In the initial stage, the adsorption (dyeing) rate is higher than the desorption rate. Finally, the rates of the two are equal, and the dyeing percentage no longer increases. In this adsorption and desorption process, level dyeing is achieved. After cationic modification, the surface of the fiber is positively charged, which has an attractive force to anionic dyes. As the distance between the dye and the fiber surface decreases, the dye will rapidly increase, accelerating the adsorption on the fiber surface, so that the adsorption rate and the desorption rate cannot be balanced, the dyeing is uneven, and color mottle is formed. Printing is to use the fabric as an impression object, and various patterns are printed on the fabric by using color paste, dyes, paste and auxiliaries. After a series of treatments such as baking or steaming, the colorant penetrates into the fiber of the fabric to achieve the purpose of dyeing. Unlike the padding and dip dyeing process, it does not need to pass through adsorption and desorption to achieve level dyeing, so that color mottle phenomenon can be avoided.

[0016] As a preferred technical solution:

[0017] The cotton fabric reactive dye printing process without steaming and washing as described above, the process of mercerizing the cotton fabric is: soaking the cotton fabric in a 220 g / L caustic soda solution at 25℃ for 50s and then drying.

[0018] The cotton fabric reactive dye printing process without steaming and washing as described above, the process of cationic modification of the cotton fabric is: shaking the mercerized cotton fabric in a cationic modification solution at 60℃ for 40-50min. The cationic modification solution is composed of a cationic modifier, caustic soda and water. The concentration of the cationic modifier is 50mL / L, and the concentration of the caustic soda is 15g / L. The difference between the method of cationic modification of the cotton fabric of the present application and the prior art is that the fabric is first mercerized and then cationically modified. Compared with only cationic modification, the color fastness of printing is higher, and the color fixation rate is higher. This is because under the action of concentrated alkali, the cotton fiber will swell irreversibly. The alkali enters the inside of the fiber, breaks the original organization structure and even the crystal structure of the fiber, arranges the originally loose and disordered state in the fiber, increases the pore channels in the fiber, and is beneficial to the dyeing of the dye.

[0019] The preparation process of the color paste used in the printing is as follows: the reactive dye solution and the sodium nicotinate solution are added into the sodium alginate paste with a concentration of 1.9 wt% and mixed uniformly, thereby obtaining the color paste, wherein the volume ratio of the reactive dye solution, the sodium nicotinate solution and the sodium alginate paste is 8:2:90, the concentration of the reactive dye in the color paste is 5-10 g / L, and the concentration of the sodium nicotinate in the color paste is 10-20 g / L.

[0020] The printing process of the cotton fabric with the reactive dye without steaming and washing is as described above, and the printing is performed by using a magnetic rod printing machine, the magnetic force is 60%, and the speed is 10 cm / min.

[0021] The printing process of the cotton fabric with the reactive dye without steaming and washing is as described above, and the curing and fixing of the color are performed at a temperature of 160-180 ℃ for 90-150 s.

[0022] Beneficial effects:

[0023] (1) The printing process of the present application does not need sizing, and the finished product has a soft hand feeling;

[0024] (2) The printing process of the present application uses sodium nicotinate as the fixing agent, so that the pH value of the fabric surface is neutral, and urea is not used, thereby reducing the burden of sewage treatment;

[0025] (3) The printing process of the present application uses high-temperature curing and fixing, and does not use steaming, thereby saving energy and reducing emissions;

[0026] (4) The printing process of the present application does not have a washing process, thereby saving water resources. DETAILED DESCRIPTION

[0027] The present application will be further described in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. In addition, it should be understood that those skilled in the art can make various modifications or changes to the present application after reading the content taught by the present application, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0028] The detection methods of the related properties of the products prepared in the following examples and comparative examples are as follows:

[0029] The detection method of the pH value of the fabric surface is GB / T 7573-2009;

[0030] The detection method of the dry rubbing fastness is GB / T 3920-2008;

[0031] Method for detecting wet rubbing fastness: GB / T 3920-2008;

[0032] Method for detecting soaping-off color change: GB / T 3921-2008;

[0033] Method for detecting cotton staining: GB / T 3921-2008.

[0034] Example 1

[0035] An active dye printing process for cotton fabric without steaming and washing, the specific steps are as follows:

[0036] (1) Cotton fabric mercerization:

[0037] The cotton fabric (manufacturer is Qingdao Yihao Knitting Co., Ltd., specification is rib 32S 168 g / m 2 ) is soaked in a caustic soda solution with a concentration of 220 g / L at 25℃ for 50 s and then dried;

[0038] (2) Cationic modification of cotton fabric:

[0039] The mercerized cotton fabric is placed in a cationic modification solution composed of a cationic modifier (manufacturer is Yantai Ruize Chemical Co., Ltd., model is RZ-302), caustic soda and water, and is shaken at 60℃ for 40 min, wherein the concentration of the cationic modifier is 50 mL / L, and the concentration of the caustic soda is 15 g / L;

[0040] (3) Printing:

[0041] A magnetic rod printing machine is used for printing; wherein:

[0042] The magnetic force is 60%, and the speed is 10 cm / min;

[0043] The preparation process of the color paste used for printing is as follows: an active dye solution (manufacturer is Zhejiang Ren Tu Co., Ltd., model is Red K-2BP) and a sodium nicotinate solution are added to a sodium alginate paste with a concentration of 1.9 wt% and mixed uniformly, thereby obtaining the color paste, wherein the volume ratio of the active dye solution, the sodium nicotinate solution and the sodium alginate paste is 8:2:90, the concentration of the active dye in the color paste is 10 g / L, and the concentration of the sodium nicotinate in the color paste is 10 g / L;

[0044] (4) Dyeing fixation by baking:

[0045] The temperature for dyeing fixation by baking is 160℃, and the time is 90 s.

[0046] The final product has a soft handle, a fabric surface pH value of 7, a dry rubbing fastness of 4-5, a wet rubbing fastness of 4, a soaping-off fastness of 4-5, and a cotton staining of 4-5.

[0047] Comparative Example 1

[0048] A printing process of cotton fabric, which is basically the same as Example 1, except that the same amount of sodium carbonate (manufacturer: Shandong Haihua Co., Ltd. Soda Ash Factory, grade: industrial grade) is used instead of sodium nicotinate in the preparation process of the color paste in step (3) of Example 1.

[0049] The final product has a fabric surface pH value of 8.5, a dry rubbing fastness of 4-5, a wet rubbing fastness of 3-4, a soaping fastness of 4, and a cotton staining of 4-5.

[0050] Comparative Example 1 has an alkaline fabric surface pH value compared to Example 1, because the fixing agent used is sodium carbonate, which is alkaline.

[0051] Comparative Example 2

[0052] A printing process of cotton fabric, which is basically the same as Example 1, except that there is no step (1), and the raw material of step (2) is an unmercerized cotton fabric (manufacturer and grade are the same as Example 1).

[0053] The final product has a fabric surface pH value of 6.7, a dry rubbing fastness of 4-5, a wet rubbing fastness of 3, a soaping fastness of 3-4, and a cotton staining of 4.

[0054] Comparative Example 2 has poor wet rubbing fastness and soaping fastness compared to Example 1, because the cotton fabric is not mercerized. After mercerization, the cotton fibers will undergo irreversible swelling under the action of strong alkali, the alkali solution will enter the interior of the fibers, breaking the original organizational structure and even the crystal structure of the fibers, and rearranging the originally loose and disordered state of the fibers, resulting in an increase in the number of pores in the fibers, which is beneficial to dyeing.

[0055] Example 2

[0056] A reactive dye printing process for cotton fabric without steaming and washing, the specific steps are as follows:

[0057] (1) Cotton fabric mercerization:

[0058] Cotton fabric (manufacturer: Qingdao Yihao Knitting Co., Ltd., specification: rib 32S 168 g / m 2 ) is soaked in a concentrated caustic soda solution at 25°C for 50s and then dried;

[0059] (2) Cationic modification of cotton fabric:

[0060] The mercerized cotton fabric is placed in a cationic modification solution composed of cationic modifier (manufacturer is Yantai Ruize Chemical Co., Ltd., model is RZ-302), caustic soda and water, and is shaken at 60℃ for 40 min, wherein the concentration of the cationic modifier is 50 mL / L, and the concentration of the caustic soda is 15 g / L;

[0061] (3) printing:

[0062] The printing is performed by using a magnetic rod printing machine; wherein:

[0063] The magnetic force is 60%, and the speed is 10 cm / min;

[0064] The preparation process of the color paste used for printing is as follows: the reactive dye solution (manufacturer is Zhejiang Ren Tu Co., Ltd., model is Red K-2BP) and sodium nicotinate solution are added into the sodium alginate paste with a concentration of 1.9 wt% and are uniformly mixed, to obtain the color paste, wherein the volume ratio of the reactive dye solution, the sodium nicotinate solution and the sodium alginate paste is 8:2:90, the concentration of the reactive dye in the color paste is 10 g / L, and the concentration of the sodium nicotinate in the color paste is 20 g / L;

[0065] (4) curing and fixing color:

[0066] The temperature of the curing and fixing color is 160℃, and the time is 90 s.

[0067] The final product has a soft hand feeling, a fabric surface pH value of 7, a dry rubbing fastness of 4-5 levels, a wet rubbing fastness of 4 levels, a soaping fastness of 4-5 levels, and a cotton staining of 4-5 levels.

[0068] Example 3

[0069] An active dye printing process without steaming and washing for a cotton fabric, and the specific steps are as follows:

[0070] (1) mercerizing of the cotton fabric:

[0071] The cotton fabric (manufacturer is Qingdao Yihao Knitting Co., Ltd., specification is Rib 32S168 g / m 2 ) is soaked in a caustic soda solution with a concentration of 220 g / L at 25℃ for 50 s, and is dried;

[0072] (2) cationic modification of the cotton fabric:

[0073] The mercerized cotton fabric is placed in a cationic modification solution composed of cationic modifier (manufacturer is Yantai Ruize Chemical Co., Ltd., model is RZ-302), caustic soda and water, and is shaken at 60℃ for 40 min, wherein the concentration of the cationic modifier is 50 mL / L, and the concentration of the caustic soda is 15 g / L;

[0074] (3) printing:

[0075] The printing is carried out by using a magnetic rod printing machine; wherein:

[0076] The magnetic force is 60%, and the speed is 10 cm / min;

[0077] The preparation process of the color paste used for printing is as follows: the reactive dye solution and the sodium nicotinate solution are added into the sodium alginate paste with a concentration of 1.9 wt% and mixed uniformly, thereby obtaining the color paste, wherein the volume ratio of the reactive dye solution, the sodium nicotinate solution and the sodium alginate paste is 8:2:90, the concentration of the reactive dye in the color paste is 10 g / L, and the concentration of the sodium nicotinate in the color paste is 10 g / L;

[0078] (4) Baking and fixing:

[0079] The temperature of baking and fixing is 180℃, and the time is 90 s.

[0080] The final product has a soft hand feeling, a fabric surface pH value of 6.9, a dry rubbing fastness of 4 levels, a wet rubbing fastness of 3-4 levels, a soaping fastness of 4-5 levels, and a cotton staining of 4 levels.

[0081] Example 4

[0082] An active dye printing process without steaming and washing for cotton fabric is provided, and the specific steps are as follows:

[0083] (1) Mercerizing of the cotton fabric:

[0084] The cotton fabric (supplied by Qingdao Yihao Knitting Co., Ltd., with a specification of Rib 32S 168 g / m 2 ) is soaked in a caustic soda solution with a concentration of 220 g / L at 25℃ for 50 s and then dried;

[0085] (2) Cationic modification of the cotton fabric:

[0086] The mercerized cotton fabric is placed in a cationic modification solution composed of a cationic modifier (supplied by Yantai Ruize Chemical Co., Ltd., with a specification of RZ-302), caustic soda and water, and is shaken at 60℃ for 40 min, wherein the concentration of the cationic modifier is 50 mL / L, and the concentration of the caustic soda is 15 g / L;

[0087] (3) Printing:

[0088] The printing is carried out by using a magnetic rod printing machine; wherein:

[0089] The magnetic force is 60%, and the speed is 10 cm / min;

[0090] The preparation process of the color paste used for printing is as follows: the reactive dye (manufacturer: Shanghai Yayun Textile Chemical Co., Ltd., brand: NF-3B) solution and sodium nicotinate solution are added into the sodium alginate paste with a concentration of 1.9 wt% and mixed uniformly, to obtain the color paste, wherein the volume ratio of the reactive dye solution, the sodium nicotinate solution and the sodium alginate paste is 8:2:90, the concentration of the reactive dye in the color paste is 10 g / L, and the concentration of the sodium nicotinate in the color paste is 10 g / L;

[0091] (4) Baking fixation:

[0092] The temperature of the baking fixation is 160℃, and the time is 90s.

[0093] The final product has a soft hand feeling, a fabric surface pH value of 7.2, a dry rubbing fastness of 4-5 levels, a wet rubbing fastness of 3-4 levels, a soaping fastness of 4 levels, and a cotton staining of 4-5 levels.

[0094] Example 5

[0095] An active dye printing process without steaming and washing for cotton fabric, the specific steps are as follows:

[0096] (1) Cotton fabric mercerization:

[0097] The cotton fabric (manufacturer: Qingdao Yihao Knitting Co., Ltd., specification: rib 32S168 g / m 2 ) is soaked in a caustic soda solution with a concentration of 220 g / L at 25℃ for 50s, and then dried;

[0098] (2) Cationic modification of cotton fabric:

[0099] The mercerized cotton fabric is placed in a cationic modification solution composed of a cationic modifier (manufacturer: Yantai Ruize Chemical Co., Ltd., brand: RZ-302), caustic soda and water, and shaken at 60℃ for 40 min, wherein the concentration of the cationic modifier is 50 mL / L, and the concentration of the caustic soda is 15 g / L;

[0100] (3) Printing:

[0101] The magnetic rod printing machine is used for printing; wherein:

[0102] The magnetic force is 60%, and the speed is 10 cm / min;

[0103] The preparation process of the color paste used for printing is as follows: the reactive dye (manufacturer: Shanghai Yayun Textile Chemical Co., Ltd., brand: NF-3B) solution and sodium nicotinate solution are added into the sodium alginate paste with a concentration of 1.9 wt% and mixed uniformly, to obtain the color paste, wherein the volume ratio of the reactive dye solution, the sodium nicotinate solution and the sodium alginate paste is 8:2:90, the concentration of the reactive dye in the color paste is 10 g / L, and the concentration of the sodium nicotinate in the color paste is 20 g / L;

[0104] (4) Baking fixation:

[0105] The temperature of the baking fixation is 160℃, and the time is 90s.

[0106] The final product has a soft hand feeling, a fabric surface pH value of 7.2, a dry rubbing fastness of 4-5 levels, a wet rubbing fastness of 4 levels, a soaping fastness of 4 levels, and a cotton staining of 4-5 levels.

[0107] Example 6

[0108] An active dye printing process without steaming and washing for cotton fabric, the specific steps are as follows:

[0109] (1) Cotton fabric mercerization:

[0110] The cotton fabric (manufacturer: Qingdao Yihao Knitting Co., Ltd., specification: rib 32S168 g / m 2 ) is soaked in a caustic soda solution with a concentration of 220 g / L at 25℃ for 50s and then dried;

[0111] (2) Cationic modification of cotton fabric:

[0112] The mercerized cotton fabric is placed in a cationic modification solution composed of a cationic modifier (manufacturer: Yantai Ruize Chemical Co., Ltd., brand: RZ-302), caustic soda and water, and is shaken at 60℃ for 40 min, wherein the concentration of the cationic modifier is 50 mL / L, and the concentration of the caustic soda is 15 g / L;

[0113] (3) Printing:

[0114] The magnetic rod printing machine is used for printing; wherein:

[0115] The magnetic force is 60%, and the speed is 10 cm / min;

[0116] The preparation process of the color paste used for printing is as follows: the active dye (manufacturer: Shanghai Yayun Textile Chemical Co., Ltd., brand: NF-3B) solution and sodium nicotinate solution are added into the sodium alginate paste with a concentration of 1.9 wt% and mixed uniformly, thereby obtaining the color paste, wherein the volume ratio of the active dye solution, the sodium nicotinate solution and the sodium alginate paste is 8:2:90, the concentration of the active dye in the color paste is 10 g / L, and the concentration of the sodium nicotinate in the color paste is 10 g / L;

[0117] (4) Baking fixation:

[0118] The temperature of the baking fixation is 180℃, and the time is 90s.

[0119] The final product has a soft hand feeling, a fabric surface pH value of 6.9, a dry rubbing fastness of 4 levels, a wet rubbing fastness of 3-4 levels, a soaping fastness of 4 levels, and a cotton staining of 4-5 levels.

Claims

1. A process for printing of cotton fabric with reactive dyes without steaming and washing, characterized in that, The process flow is: cotton fabric mercerization, cationic modification, printing, baking and fixing; The color paste used in printing contains a fixing agent, and the fixing agent is sodium nicotinate; The preparation process of the color paste used in printing is: the active dye solution and the sodium nicotinate solution are added into the sodium alginate paste with a concentration of 1.9wt% and mixed uniformly, thereby obtaining the color paste, wherein the volume ratio of the active dye solution, the sodium nicotinate solution and the sodium alginate paste is 8:2:90, the concentration of the active dye in the color paste is 5-10g / L, and the concentration of the sodium nicotinate in the color paste is 10-20g / L; The temperature of baking and fixing is 160-180℃, and the time is 90-150s; The pH value of the product obtained by baking and fixing is 6.9-7.2, the dry rubbing fastness is 4-5 grades, the wet rubbing fastness is 3-4 grades, the soaping fastness is 4-5 grades, and the cotton staining is 4-5 grades.

2. A process for printing of cotton fabric with reactive dyes without steaming and washing as claimed in claim 1 wherein, The process of mercerizing the cotton fabric is: the cotton fabric is soaked in a caustic soda solution with a concentration of 220g / L at 25℃ for 50s and then dried.

3. A process for printing of cotton fabric with reactive dyes without steaming and washing as claimed in claim 2 wherein, The process of cationic modification of the cotton fabric is: the mercerized cotton fabric is oscillated in a cationic modification solution at 60℃ for 40-50min, and the cationic modification solution is composed of a cationic modifier, caustic soda and water.

4. A process for printing of cotton fabric with reactive dyes without steaming and washing as claimed in claim 1 wherein, The printing is performed by using a magnetic rod printing machine, the magnetic force is 60%, and the speed is 10cm / min.