One-bath process of active soaping and acid dyeing of nylon-cotton fabric

Abstract

The invention discloses a one-bath process for active soaping and acid dyeing of nylon-cotton fabrics, which relates to energy-saving dyeing and finishing technology, and aims to solve the problem that the nylon-cotton fabrics need a long time to complete dyeing, which results in more water, electricity and steam costs. The technical scheme is as follows: the dyeing step includes: the specific steps of soaping and neutralization include: S1 water washing and acid treatment, washing the fabric after the active cotton dyeing step, and performing acid treatment after washing; S2 soaping and adjusting the pH value, after the acid treatment, adding soaping agent, leveling agent and sodium acetate at the same time under room temperature, adjusting the solution to be weakly acidic, and adding acid dye without draining. The improvement of the invention realizes that the nylon-cotton fabric dyed and finished by the process has good quality of stable color and smooth surface, and at the same time, by saving the operation of heating once and the step of drainage and cleaning, the time of the whole treatment process is saved, the amount of water, electricity and steam is saved, and the purpose of reducing costs is achieved.

Description

Technical Field

[0001] The invention relates to a dyeing and finishing energy-saving technology, and more specifically to a one-bath process for active soaping and acid dyeing of nylon-cotton fabrics. Background Art

[0002] In the field of textiles and apparel, nylon is widely used due to its advantages such as high strength, good wear resistance, light weight, mildew resistance, bright dyeing color, etc. However, its poor comfort due to poor hygroscopicity, poor heat and light resistance, and easy generation of static electricity also limit the application scope of nylon to a certain extent. In order to solve the shortcomings of nylon fabric itself, fabrics blended with surface components or toes came into being. Nylon-cotton fabrics perfectly combine the advantages of cotton and nylon fibers: anti-static, no pilling, good air permeability, skin-friendly, comfortable to wear, wear-resistant and durable, etc., so nylon-cotton fabrics are very popular in the market.

[0003] Nylon-cotton fabrics contain two fiber components. During the dyeing process, the nylon in the fabric carries different charges in different pH solutions. In neutral or weakly alkaline baths, the nylon carries a charge - OOC-NHOC-NH2, which is basically not dyed by acid dyes; in weakly acid baths, the nylon carries a positive charge H00C-HNOC-N+H3, and the acid dyes are bonded to the fibers in a salt-like bond, thereby completing the coloring. However, when dyeing cotton fibers with reactive dyes, it is necessary to rely on alkali agents for color fixation, so the dyeing must be completed in an alkaline bath. In addition, acid dyes for dyeing nylon have poor transferability and are easy to stain. The dyes have poor covering power for the fiber microstructure, and defects are easily exposed. The process must control the gradual increase in temperature and the addition of acid in batches. The process of dyeing cotton with reactive dyes takes a long time because of the steps of dyeing promotion, color fixation and soaping, so it takes a long time for the nylon-cotton fabric to complete the dyeing, resulting in more water, electricity and steam costs.

[0004] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0005] In view of the shortcomings of the prior art, the object of the present invention is to provide a one-bath process for active soaping and acid dyeing of nylon-cotton fabrics.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a one-bath process for active soaping and acid dyeing of nylon-cotton fabrics, which is applied to dyeing and finishing nylon-cotton blended fabrics, and the dyeing steps include:

[0007] Reactive dyeing of cotton, dyeing the cotton component of the fabric;

[0008] Soaping to neutralize;

[0009] Acid dyeing of nylon to complete the dyeing of the nylon component in the fabric;

[0010] Wash out of the tank with water;

[0011] The specific steps of soaping and neutralization include:

[0012] S1: washing with water and acid treatment, washing the fabric after the reactive cotton dyeing step, and then performing acid treatment after washing;

[0013] S2 soaping to adjust the pH value. After the peracid treatment, add soaping agent, leveling agent and sodium acetate at the same time at room temperature to adjust the solution to be weakly acidic. Add acid dye without draining.

[0014] By adopting the above technical scheme, compared with the traditional dyeing process for nylon-cotton blended fabrics, this process adopts a one-bath method to improve the efficiency of the entire dyeing process, and after the water washing and acidification operation, the soaping agent is directly added. Compared with the traditional steps of draining, neutralizing and then heating soaping after the acidification, the soaping agent is directly added after the acidification operation in this process. According to experiments, the soaping step can also be completed in a weakly acidic environment, and after the soaping pH value adjustment step, the acid dye is directly added to color the nylon component in the blended fabric, and in the experiment, the active soaping agent has no effect on the coloring of the acid dye. Therefore, this process changes the active soaping from the traditional neutral to the weakly acidic soaping, and performs the dyeing with the acid dye in the same bath, shortening the steps of the fabric dyeing operation and shortening the process time to achieve the purpose of saving water, energy and steam.

[0015] The present invention is further configured as follows: the specific step of washing the peracid comprises: draining the solution in the machine cylinder after the active cotton dyeing step, adding a cylinder of clean water to wash for 10 minutes, directly adding acetic acid, and running for 10 minutes at room temperature.

[0016] The present invention is further configured as follows: the specific step of adjusting the pH value by soaping includes: according to the depth of the dyeing color, directly adding 0.5-1g / L of soaping liquid after completing the peracid treatment, and adding a leveling agent and NaAC at the same time, and adjusting the pH value of the solution to pH=4-6.

[0017] By adopting the above technical scheme, after the peracid treatment is completed, according to the depth of the dyed color, 0.5-1g / L of soaping agent is added, which can have a good soaping effect, and at the same time, a leveling agent and NaAC (sodium acetate) are added to adjust the pH value of the solution in the machine cylinder to a weak acid level, and the leveling agent added at the same time can make the dye evenly dyed to achieve a level dyeing effect. Compared with conventional dyeing, the steps of heating, changing water, and cleaning are omitted, and the process time is greatly shortened.

[0018] The present invention is further configured as follows: the specific steps of active cotton dyeing include:

[0019] Circulate salt, add electrolyte and soda ash into the machine cylinder, and run for 20 minutes;

[0020] Pre-dyeing: put the prepared reactive dye into the machine tank and run it at a constant temperature for 20 minutes;

[0021] Add one-third of the alkali agent, and after running for 6 minutes, add two-thirds of the alkali agent;

[0022] After the dyeing process is started and the alkali agent addition step is completed, the temperature of the solution in the machine cylinder is raised to 60 degrees Celsius at a rate of 1.2 degrees Celsius / min, and the temperature is kept constant for 40 minutes. After completion, the solution in the machine cylinder is drained.

[0023] The present invention is further configured as follows: the specific steps of the acid dyeing brocade include:

[0024] After the initial heating, soaping and neutralization operations are completed, the acid dye is directly added to the machine cylinder, and the temperature is raised to 70 degrees Celsius at a rate of 1°C / min, acetic acid is added, and the machine is operated at a constant temperature for 30 minutes;

[0025] Second stage heating: after the first stage heating, the temperature is raised to 100°C at a rate of 1°C / min and kept at this temperature for 30 minutes;

[0026] Cool down at a constant rate of 1℃ / min to 60℃, and then drain the solution in the cylinder.

[0027] The present invention is further configured as follows: the reactive dye used in the reactive cotton dyeing step is selected from one of K type, SF type or KN type.

[0028] By adopting the above technical scheme, a reactive dye of type K, type SF and type KN is selected. The reactive dyes of type K, type SF and type KN have good hydrolysis resistance, which can improve the dyeing effect of the fabric, and the dyeing temperature is in the range of 40-70°C, which can reduce the energy consumption required for heating.

[0029] In summary, the present invention has the following beneficial effects:

[0030] Compared with the traditional dyeing process for nylon-cotton blended fabrics, this process adopts a one-bath method to improve the efficiency of the entire dyeing process, and directly adds soaping agent after water washing and acidification. Compared with the traditional steps of draining, neutralizing and then heating soaping after acidification, this process directly adds soaping agent after the acidification operation. According to experiments, the soaping step can also be completed in a weakly acidic environment, and after the soaping pH value adjustment step, acid dyes are directly added to color the nylon components in the blended fabric. In the experiment, the active soaping agent has no effect on the coloring of the acid dye. Therefore, this process changes the active soaping from traditional neutral to weakly acidic soaping, and performs dyeing with acid dyes in the same bath, shortening the steps of fabric dyeing operations and shortening the process time to achieve the purpose of saving water, energy and steam, and reducing the time the fabric runs in the machine cylinder, further improving the friction of the fabric surface and improving the quality of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a process flow chart of a comparative example in the present invention;

[0032] Figure 2 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] A one-bath process for active soaping and acid dyeing of nylon-cotton fabrics, which is applied to dyeing and finishing of nylon-cotton blended fabrics, such as Figure 2 As shown, the staining steps include:

[0035] Reactive dyeing of cotton, dyeing the cotton component of the fabric;

[0036] Soap washing and neutralization, the specific steps include: S1 water washing and acid treatment, the fabric after the active cotton dyeing step is washed, and the fabric is subjected to acid treatment after washing. Specifically, the solution in the machine cylinder after the active cotton dyeing step is drained, a cylinder of clean water is added to wash for 10 minutes, and acetic acid is directly added, and the machine is operated for 10 minutes at room temperature.

[0037] S2 soaping to adjust the pH value. After the peracid treatment, add soaping agent, leveling agent and sodium acetate at room temperature to adjust the solution to be weakly acidic. Add acid dye without draining. Specifically, according to the depth of the dyeing color, add 0.5-1g / L soaping liquid directly after the peracid treatment, and add leveling agent and NaAC at the same time to adjust the solution pH to 4-6.

[0038] Acid dyeing of nylon to complete the dyeing of the nylon component in the fabric;

[0039] Wash out of the tank with water;

[0040] like Figure 2 As shown, the specific steps of reactive cotton dyeing include:

[0041] Circulate salt, add electrolyte and soda ash into the machine cylinder, and run for 20 minutes;

[0042] For pre-dyeing, the prepared reactive dye is added into the machine cylinder and operated at a constant temperature for 20 minutes. The reactive dye is selected from one of the K type, SF type or KN type.

[0043] Add one-third of the alkali agent, and after running for 6 minutes, add two-thirds of the alkali agent;

[0044] After the dyeing process is started and the alkali agent addition step is completed, the temperature of the solution in the machine cylinder is raised to 60 degrees Celsius at a rate of 1.2 degrees Celsius / min, and the temperature is kept constant for 40 minutes. After completion, the solution in the machine cylinder is drained.

[0045] The specific steps of acid dyeing brocade include:

[0046] After the initial heating, soaping and neutralization operations are completed, the acid dye is directly added to the machine cylinder, and the temperature is raised to 70 degrees Celsius at a rate of 1°C / min, acetic acid is added, and the machine is operated at a constant temperature for 30 minutes;

[0047] Second stage heating: after the first stage heating, the temperature is raised to 100°C at a rate of 1°C / min and kept at this temperature for 30 minutes;

[0048] Cool down at a constant rate of 1℃ / min to 60℃, and then drain the solution in the cylinder.

[0049] Comparative example: Figure 1 As shown, after the blended fabric is put into the machine cylinder, it is successively subjected to the steps of cyclic salt addition, addition of reactive dyes and alkali agent, and then the temperature is raised at a rate of 1.2°C / min. When the temperature reaches 60°C, it is kept warm for dyeing for 40 minutes, the solution in the machine cylinder is drained for the first time and a cylinder of clean water is added for washing. After washing for 10 minutes, acetic acid solution is added and the machine cylinder is operated for 10 minutes to complete the acid operation, and then soaping agent is added to directly raise the temperature to 85°C. After keeping warm for soaping for 15 minutes, the temperature is lowered to 60°C at a rate of 1.5°C / min. After running for 10 minutes, add the prepared acid dye, heat it to 70°C at a rate of 1°C / min, then add acetic acid to keep the pH value of the solution in the machine cylinder stable, and then heat it to 100°C at a rate of 1°C / min. After keeping warm for 30 minutes, cool it to below 60°C at a rate of 1°C / min, drain the solution in the machine cylinder, wash the fabric out of the cylinder, and carry out subsequent finishing operations.

[0050] In the present embodiment and the comparative example, reactive dyes, acid dyes and other textile auxiliaries of the same specifications are used, and conventional medium-sensitive medium-depth colors are taken as an example. In order to calculate the time spent on the process, the average time spent by different personnel for the same operation is taken for calculation. The steps of dye preparation and addition, alkali agent addition, drainage and re-addition of clean water are measured and evaluated with the same operation time to avoid the impact.

[0051] like Figure 1 and Figure 2 As shown, after many tests, in the comparative example, the operation of reactive dyeing of cotton takes about 163 minutes, the cleaning, peracidification and soaping and color fixing operations after the reactive dyeing operation take about 57 minutes, and the acid dyeing process operation takes about 205 minutes. The total time required for the operating steps of the comparative example is 425 minutes, which is about 7.1 hours.

[0052] In multiple tests, the process flow adopted in this embodiment takes about 163 minutes in the active cotton dyeing step, about 55 minutes in the washing and acid soaping steps of the fabric after active cotton dyeing, and about 160 minutes in the acid dyeing operation, totaling 378 minutes, about 6.3 hours, which is nearly one hour shorter than the conventional dyeing and finishing steps. The entire step adopted in this embodiment requires drainage twice, which saves one drainage and cleaning operation compared to the process steps adopted in the comparative example. Therefore, it can save 2-3 cylinders of water. Calculated according to a bath ratio of 1:6, it can save 1 / 3 of the steam cost of 12-18 water, about 1.2 tons of steam / ton of cloth.

[0053] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A one-bath process for active soaping and acid dyeing of nylon-cotton fabrics, which is applied to dyeing and finishing nylon-cotton blended fabrics, characterized in that: The dyeing steps include: Reactive dyeing of cotton, dyeing the cotton component of the fabric; Soaping to neutralize; Acid dyeing of nylon to complete the dyeing of the nylon component in the fabric; Wash out of the tank with water; The specific steps of soaping and neutralization include: S1: washing the fabric after the active dyeing step, and then performing an acid treatment. The specific steps of washing the fabric include: draining the solution in the machine cylinder after the active dyeing step, adding a cylinder of clean water to wash for 10 minutes, directly adding acetic acid, and running for 10 minutes at room temperature; S2 soaping to adjust the pH value, after the peracid treatment is completed, soaping agent, leveling agent and sodium acetate are added at the same time at room temperature to adjust the solution to be weakly acidic, and acid dye is added without draining. The specific steps of soaping to adjust the pH value include: according to the depth of the dyeing color, 0.5-1g / L soaping liquid is directly added after the peracid treatment is completed, and leveling agent and NaAC are added at the same time to adjust the solution pH to pH=4-6; The specific steps of the acid dyeing process include: After the initial heating, soaping and neutralization operations are completed, the acid dye is directly added to the machine cylinder, and the temperature is raised to 70 degrees Celsius at a rate of 1°C / min, acetic acid is added, and the machine is operated at a constant temperature for 30 minutes; Second stage heating: after the first stage heating, the temperature is raised to 100°C at a rate of 1°C / min and kept at this temperature for 30 minutes; Cool down at a constant rate of 1℃ / min to 60℃, and then drain the solution in the cylinder.

2. The one-bath process for active soaping and acid dyeing of nylon-cotton fabric according to claim 1, characterized in that: The specific steps of the reactive cotton dyeing include: Circulate salt, add electrolyte and soda ash into the machine cylinder, and run for 20 minutes; Pre-dyeing: put the prepared reactive dye into the machine tank and run it at a constant temperature for 20 minutes; Add one-third of the alkali agent, and after running for 6 minutes, add two-thirds of the alkali agent; After the dyeing process is started and the alkali agent addition step is completed, the temperature of the solution in the machine cylinder is raised to 60 degrees Celsius at a rate of 1.2 degrees Celsius / min, and the temperature is kept constant for 40 minutes. After completion, the solution in the machine cylinder is drained.

3. The one-bath process for active soaping and acid dyeing of nylon-cotton fabric according to claim 2, characterized in that: The reactive dye used in the reactive cotton dyeing step is selected from one of K type, SF type or KN type.

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