TW201435176A - One-bath and two-stage dyeing method for textile of nylon and cotton - Google Patents

Abstract

The invention relates to a one-bath and two-stage dyeing method for textile of nylon and cotton providing a method capable of completing in two hours while using acid reactive dye to dye the textile interwoven or blended by nylon and cotton. By regulating and controlling pH values and temperatures, the textile is sequentially dyed by way of firstly dyeing nylon and further dyeing cotton, and time for one-bath and two-stage dyeing is precisely controlled to ensure that it won't too long or too short so as to maintain the dyeing quality of finished products such that the color does not become color difference between nylon and cotton, and it does easily come off and decolorize as well.

Description

One-bath two-stage dyeing method for nylon and cotton fabrics

The invention relates to a fabric one-bath two-stage dyeing method, in particular to a method for rapidly dyeing a fabric which is blended or interlaced with nylon and cotton.

In the field of dye technology, each dye has its specific suitable dyeing standard. For example, Pre-metallized Acid Dyes is mostly used for dyeing and continuous dyeing of nylon (polyamide) and wool fiber. Processing such as printing can achieve ideal dyeing results for different types or types of nylon or wool fibers.

However, if the dyed fabric is not composed of nylon or wool fibers, but a blend of nylon and cotton or interwoven fabrics, reactive dyes are required when the dyeing ability of acid-containing gold dyes is difficult to control. Dye)'s involvement. The reactive dye also has one or more reactive groups in its molecular structure. Under appropriate conditions, it can chemically react with cotton fibers to form a covalent bond and dye.

In practice, for the blended or interwoven fabric of nylon and cotton, it is necessary to dye by means of a two-bath method. That is, it is necessary to independently apply the reactive dye to the cotton in the fabric at about 60 ° C; then, after the first water washing, the fabric is dyed at about 100 ° C using an acid dye. To ensure that a single fabric does not create a color difference between nylon fibers and cotton fibers. However, this two-bath dyeing method takes at least eight hours and is inefficient.

Therefore, considering the cost and efficiency, the two-bath dyeing technology is further improved, that is, how to complete the dyeing under one bath condition is a problem to be solved.

Chinese Patent Application No. CN 201010257331.5 discloses a modified polyester/cotton blend fabric and a dyeing method thereof, which are dyed by a bath method in which a polyester/cotton blend fabric is dyed in the middle without using an acid dye. The modified polyester has a polyammonium molecular block, so it can be dyed with an acid dye, but it also uses a disperse dye (Disperse Dyes). Therefore, two dyes are used for dyeing under one bath. .

In addition, in the technical content disclosed in Japanese Patent Publication No. JP2006138024, although it is one-bath and two-stage dyeing for a blended fabric of nylon and cotton, it also uses two dyes to dye different objects at different stages. . More specifically, it dyes nylon with a disperse dye and then dyes the cotton with an anthraquinone dye (Vat Dye). Therefore, the dye exchange is required in the process, and the temperature and pH value are different for different dyes. The specific adjustments on it are still inconvenient.

In view of the fact that nylon fibers basically require acid dyes, and cotton fibers require the use of reactive dyes for dyeing, acid reactive dyes have been developed to meet the dyeing requirements of nylon and cotton blended or interwoven fabrics. Therefore, how to provide a better one-bath operation and control parameters for the blended fabric of nylon and cotton under the dyeing using an acidic reactive dye to obtain the dyeing quality which is not easy to fall off and discolor, which is the present invention. Technical characteristics.

The main object of the present invention is to provide a one-bath two-stage dyeing method for nylon and cotton fabrics, which precisely passes the temperature and the pH value of the dyeing environment, and firstly dyes the nylon and then dyes the cotton to ensure that the two are Under the one-bath dyeing operation, the dye can be attached to avoid uneven distribution of the dye, thus causing chromatic aberration.

A secondary object of the present invention is to provide a one-bath two-stage dyeing method for nylon and cotton fabrics, which is a method for dyeing a fabric blended or woven with nylon and cotton using an acid reactive dye. Make sure the dye is successfully dyed on both nylon and cotton and does not fall off easily.

Another object of the present invention is to provide a one-bath two-stage dyeing method for nylon and cotton fabrics, which is based on a one-bath method without transferring fabrics to different dyeing tanks, or by changing dyeing agents, or by washing in between, so Dyeing is completed in a short time, with high dyeing efficiency and economic value.

In order to achieve the above object, the present invention discloses a one-bath two-stage dyeing method for a nylon and cotton fabric, the steps of which comprise: heating a dyeing cylinder from room temperature to a first temperature, the dyeing cylinder having a dye and a fabric, The fabric is a nylon fiber and a cotton fiber blended or interwoven fabric; maintaining the first temperature to fix the dye to the nylon fiber; lowering the dyeing cylinder to a second temperature; maintaining the second temperature to fix the dye The cotton fiber is taken; and the fabric is taken out and soaped; wherein the dye is an acid reactive dye. Under such adjustment and operation, the purpose of dyeing nylon and dyeing cotton can be achieved, and nylon and cotton dyeing can be completed under the conditions of single dyeing tank and single dye dyeing.

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First: it is a flow chart of the steps of the present invention;
The second drawing is a flow chart of another step of the present invention; and the third drawing is a temperature-time relationship diagram of a preferred embodiment of the present invention.

For a better understanding and understanding of the features and advantages of the present invention, the preferred embodiments and the detailed description are described as follows:

First, please refer to the first figure, which is a basic and necessary operation step of the present invention, which includes:

Step S1: heating a dyeing cylinder from room temperature to a first temperature, the dyeing cylinder having a dye and a fabric, the fabric being a nylon fiber and a cotton fiber blended or interwoven fabric;

Step S2: maintaining the first temperature to fix the dye to the nylon fiber;

Step S3: cooling the dyeing cylinder to a second temperature;

Step S4: maintaining the second temperature to fix the dye to the cotton fiber;

Step S5: The fabric is taken out and soaped.

Among them, the dye is an acid reactive dye.

Before operating the method of the present invention, the user has prepared an N/C cloth to be dyed, that is, a fabric in which nylon (Nylon) fibers and cotton fibers are blended, and the ratio of the two is not limited.

In addition, the user has also prepared a circulating dyeing cylinder for dyeing, in which the dye used is an acid reactive dye. The acid reactive dye is an acid dye containing a sulfonic acid group or a reactive group such as a carboxyl group.

In step S1, the user heats the dyeing cylinder under the prepared dyeing tank, dye and fabric to raise the dyeing environment in the dyeing tank from room temperature to the first temperature. The first temperature is between 75 ° C and 85 ° C, and the preferred temperature is 80 ° C. Excessive temperatures can damage the fabric and also increase energy consumption. As for the rate of heating, it is controlled to increase the temperature by 1 ° C ~ 2 ° C per minute.

After the temperature rises to the first temperature, it enters the dyeing stage of nylon. At this time, the dyeing environment will maintain a first temperature for about 35 to 45 minutes, so that the acidic reactive dye can be fixed on the nylon fiber to complete the dyeing of the nylon, and the cotton material has not yet been dyed.

Then, the user directly lowers the dyeing tank to the second temperature without replacing the dyeing tank or the dye under the same dyeing environment. The second temperature ranges from 55 ° C to 65 ° C, and the preferred temperature is 60 ° C.

After cooling to the second temperature, the cotton fiber that has not been dyed is dyed. After the second temperature is maintained for 55~65 minutes, the acid reactive dye can be fixed on the cotton fiber to complete the dyeing of the cotton, that is, the acid reactive dye has been fixed on the nylon fiber and the cotton fiber at the same time. Dyeing treatment of N/C cloth. Wherein, if the treatment time of the second temperature is less than 50 minutes, the degree of dyeing of the cotton fiber by the acid reactive dye is insufficient, and the difference in chromaticity between the cotton and the nylon is easily caused, resulting in uneven dyeing, Invention Under a number of experimental tests, the range of parameters for this operation was confirmed and defined.

Then, the user removes the dyed fabric from the dyeing tank and performs subsequent soaping treatment to remove the undyed dye, preventing the undyed dye from remaining on the surface of the fabric and causing the dyeing of the fabric. Fastness is reduced.

In addition to the temperature control, please refer to the second figure, the invention also has a control on the pH value of the dyeing environment, which is before step S1, and further includes a step S10: adding an acid agent to the dyeing tank to adjust the solution in the dyeing tank The pH value is 4~5, which means that the initial dyeing environment is adjusted to be acidic, so that the nylon dyeing environment is acidic. In addition, after step S3, further comprising a step S30: sequentially adding sodium sulfate and an alkali agent to adjust the pH value of the solution in the dyeing tank to 10 to 11; in other words, the dyeing of the cotton needs to be performed under an alkaline environment, It is necessary to add an alkali agent after cooling to adjust the pH value. Among them, the alkali agent used in the present invention may be sodium carbonate (Na ₂ CO ₃ ).

In the present invention, the N/C cloth is dyed to a preferred embodiment under the condition that the Liquor Ratio is 1:10. For the relationship between the process temperature and time, please refer to the third figure. As shown in the figure, before the start of dyeing, acetic acid (CH ₃ COOH) was used as an acid agent, and the environment of the dyeing tank was adjusted to an acidic state of pH 4 to 5, and then the temperature was raised to 80 ° C to dye the nylon for 40 minutes. Then, the temperature is lowered to 60 ° C, sodium sulfate is added first, then sodium carbonate is added, the environment of the dyeing tank is adjusted to an alkaline state of pH 10 to 11, and then the acidic reactive dye is dyed against the cotton under the environmental conditions. After 60 minutes, the dyeing tank environment was adjusted to neutral using acetic acid (1 g/L), and the fabric was taken out for soaping.

The soaping of this example was carried out using INS International's IncNavaux. Soaper SO-TS (0.2-0.3 g/L) as a soaping agent, followed by soaping at 90 ° C for 20 minutes, and the resulting product was uniformly dyed and Not easy to fade, certified by the American Association of Textile Chemists and Colorists (AATCC).

The one-bath two-stage dyeing method of the nylon and cotton fabric of the invention can complete the dyeing of the blended fabric composed of nylon and cotton in about two hours, and does not produce dyeing chromatic aberration between the nylon fiber and the cotton fiber, and is used. The material does not contain expensive or rare materials, and has a balance between efficiency, quality and cost. Therefore, the present invention undoubtedly provides a one-bath two-stage dyeing method for nylon and cotton fabrics with economical and practical value.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and the variations, modifications, and modifications of the shapes, structures, features, and spirits described in the claims of the present invention. All should be included in the scope of the patent application of the present invention.

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Claims (10)

A one-bath two-stage dyeing method for nylon and cotton fabrics, the steps of which include:
Heating a dyeing cylinder from room temperature to a first temperature, the dyeing cylinder having a dye and a fabric, the fabric being a blend of nylon fibers and cotton fibers or interwoven fabric;
Maintaining the first temperature to fix the dye to the nylon fiber;
Cooling the dyeing cylinder to a second temperature;
Maintaining the second temperature to fix the dye to the cotton fiber; and removing and soaping the fabric;
Among them, the dye is an acid reactive dye. The method of claim 1, wherein the first temperature system is between 75 ° C and 85 ° C and the maintenance time is 35 to 45 minutes. The method of claim 1, wherein before the step of heating the dyeing tank to the first temperature, the method further comprises the steps of: adding an acid agent to the dyeing tank to adjust the pH value of the solution in the dyeing tank to 4~ 5. The acid agent is acetic acid. The method of claim 1, wherein in the step of heating the dyeing cylinder to the first temperature, the heating rate is 1 ° C to 2 ° C per minute. The method of claim 1, wherein the second temperature system is between 55 ° C and 65 ° C and the maintenance time is 55 to 65 minutes. The method of claim 1, wherein after the step of lowering the dyeing cylinder to the second temperature, the method further comprises the step of: adding an alkali agent to adjust the pH value of the solution in the dyeing tank to 10-11. The method of claim 6, wherein the alkali agent is sodium carbonate. The method of claim 6, wherein sodium sulfate is added prior to the addition of the alkali agent. The method of claim 1, wherein the acidic reactive dye is an acid dye containing a reactive group. The method of claim 9, wherein the reactive group is selected from the group consisting of a sulfonic acid group and a carboxyl group.