CN101187175B - Dyeing method of natural dyes based on cotton fiber modification - Google Patents

Abstract

The invention relates to a dyeing method of natural dye material of cotton fabric, which belongs to the field of fabric dyeing and finishing technique and comprises: processing the modifying liquid byuse of the modifying agent containing anode ions group, firstly modifying the cotton fabric and dyeing the fabric with the natural dyeing material, after cleaning, fulfilling the dyeing with the natu ral dye material of cotton fabric, wherein due to the modifying process on the cotton fabric in advance, the anode ion base is introduced into the cotton fabric to strengthen the combination ability from the cotton fabric to the natural dye material of cathode ion, which effectively improves the cotton fabric dyeing rate, color depth and dyeing evenness and distinctly improves the anti-washing andanti-abrasion firmness of the dyed cotton fabric. The process has simple operation, even dyeing and wide application prospect.

Description

Dyeing method of natural dyes based on cotton fiber modification

Technical field: the present invention relates to the natural dye dyeing technology of cotton fiber, belongs to the technical field of textile dyeing and finishing, particularly relates to the preparation method of the modified liquid of cotton fiber and its application in natural dye dyeing technology.

Background technique

Cotton fiber is an important natural fiber, which is favored by people for its advantages such as wearing comfort, renewability and biodegradability. Natural dyes come from nature, are harmless to human health, and have good compatibility with the environment, do not pollute the environment, are biodegradable, and meet the requirements of modern people for their own health and environmental protection. Therefore, the ecological dyeing technology using natural dyes is in line with the concept of modern environmental protection and ecology.

Most natural dyes have high dye uptake and color fastness on protein fibers such as silk and wool, but low dye uptake and poor color fastness on cellulose fibers such as cotton and hemp, so mordants are needed Treatment can achieve higher dye uptake and color fastness, but most of the traditional natural dye mordants are heavy metal salts, which are not good for the environment. Comparing the structures of cellulose fibers and protein fibers, it can be seen that protein fibers contain many reactive groups such as amino groups and carboxyl groups, among which the amino groups on protein fibers are positively charged in the dye solution, making negatively charged natural dyes easy to dye. Adsorption and dyeing, so natural dyes have better dyeing rate and color fastness on protein fibers. The reactive groups in cellulose fibers are only hydroxyl groups, which are of a single type and lack positively charged groups similar to amino groups. Therefore, in view of the weak affinity between natural dyes and cotton fibers, the single type of active groups on cotton fibers and the weak reaction ability, try to chemically modify the cotton fiber to make its surface cationic, so as to strengthen cotton fiber. The combination ability of fibers and natural dyes can improve the dyeing rate and color fastness of natural dyes on cotton fabrics.

Contents of the invention

The object of the invention is to overcome the shortcomings of low dyeing rate and poor color fastness of natural dyes on cotton fibers, and provide a natural dyeing method based on cotton fiber modification.

In order to achieve the above object, the technical scheme adopted by the present invention is: provide a kind of natural dye dyeing method based on cotton fiber modification, it is characterized in that the treatment process step is as follows: a kind of natural dye dyeing method based on cotton fiber modification, its characteristic The processing steps are as follows:

(1) Cotton fibers are modified with a modified solution prepared from a modifier containing cationic groups and caustic soda, wherein the amount of cationic modifier is 15-25 g/L, and the amount of caustic soda is 2-8 g/L liter, the modification treatment temperature is 60-80°C, and the time is 30-60 minutes;

(2) At room temperature, first treat the cotton fabric in 15-25 g/L cationic modifier for 10 minutes, then raise the temperature to 60-80°C at a heating rate of 1-2°C/min, and add 2- 8 g/L caustic soda, continue to process for 30-60 minutes;

(3) Dye the modified cotton fabric in the natural dye solution for 5-20 minutes at room temperature, then raise the temperature to 70-98°C at a heating rate of 1-2°C/min, and continue to dye for 30-90°C. minute;

(4) Finish the natural dyeing of cotton fiber after washing.

The cationic modifier contains cationic groups, such as amines or quaternary ammonium compounds containing epoxy groups, methylol acrylamide compounds, nitrogen-containing heterocyclic compounds, amino polymers and the like.

The concentration of described natural dye dye liquor is X% (o.w.f) (X decides according to fabric color depth and dye performance), promptly every gram fabric needs 0.0X gram dyestuff, bath ratio (referring to cloth weight quality: dye liquor quality )=1:5～1:40, the dyeing temperature is 70～98°C, and the dyeing time is 30～90 minutes.

The weight percent concentration of the natural dye relative to the fabric is X%, which is determined according to the color depth of the fabric and the performance of the dye.

The application of the modifying solution prepared by the modifying agent containing cationic groups and caustic soda in the dyeing treatment of cotton fiber with natural dyes.

Compared with the prior art, the present invention has the following advantages:

(1) The cationic modifier used in the present invention can react with cotton fibers under alkaline conditions, and introduces a positive charge on the cotton fibers, thus enhancing the adsorption capacity of cotton fibers to anionic natural dyes, effectively improving the natural dyes. Dye uptake on cotton fibers.

(2) The present invention overcomes the shortcoming of using mordants for dyeing cotton fibers with traditional natural dyes, and meets the requirements of green dyeing and finishing technology.

(3) After modification, it not only improves the dyeing uniformity of natural dyes on cotton fabrics, but also endows dyed cotton fabrics with good washing fastness and rubbing fastness.

(4) The natural dyeing technology based on cotton fiber modification of the present invention has uniform dyeing, simple process and convenient operation, especially can use dyeing machines for large-scale production, and has broad application prospects.

Description of drawings

Figure 1 shows the depth of color of cotton fabrics dyed with natural dyes.

Figure 2 shows the wash fastness of cotton fabrics dyed with natural dyes under modified process conditions.

Figure 3 shows the rubbing fastness of cotton fabrics dyed with natural dyes under modified process conditions.

Detailed ways

Embodiment one:

The present embodiment selects cotton fabric to carry out dyeing treatment, and concrete steps are as follows:

(1) Cationic modified liquid treatment

The formula of the cationic modifier solution is as follows: the dosage of cationic modifier is 15 g/liter, the bath ratio is 1:20, the cotton fabric is treated for 10 minutes at room temperature, and then the temperature is raised to 70 DEG C at a heating rate of 2 DEG C/min, and the 4 g/L caustic soda, treated at 70°C for 60 minutes, after modification, wash the fabric with cold water.

(2) Dyeing with natural dyes

Cotton fabrics treated with the above cationic modification solution were dyed with natural dyes copper sodium chlorophyllin, annatto and gardenia yellow; at the same time, the same dyeing process was used to dye the cotton fabric without cationic modification solution as it was deal with. The formula of the dyeing solution is: the weight percent concentration (o.w.f) of the dye relative to the fabric is 2%, the bath ratio is 1:20, at room temperature, the cotton fabric treated with the above-mentioned treatment solution is dyed for 10 minutes, and then dyed at 2°C. The heating rate per minute was raised to 80°C, and the dyeing was carried out at a temperature of 80°C for 60 minutes. After dyeing, wash and dry.

Embodiment two:

(1) Cationic modified liquid treatment

The formula of the cationic modifier solution is as follows: the cationic modifier dosage is 18 g/L, the bath ratio is 1:20, the cotton fabric is treated for 5 minutes at room temperature, and then the temperature is increased to 70 DEG C at a heating rate of 2 DEG C/min, and the 5 g/L caustic soda, treated at 70°C for 60 minutes, after modification treatment, wash the fabric with cold water.

(2) Dyeing with natural dyes

Cotton fabrics treated with the above cationic modification solution were dyed with natural dyes copper sodium chlorophyllin, annatto and gardenia yellow; at the same time, the same dyeing process was used to dye the cotton fabric without cationic modification solution as it was deal with. The formula of the dyeing solution is: the weight percent concentration (o.w.f) of the dye relative to the fabric is 2%, the bath ratio is 1:20, at room temperature, the cotton fabric treated with the above-mentioned treatment solution is dyed for 10 minutes, and then dyed at 2°C. The heating rate per minute was raised to 80°C, and the dyeing was carried out at a temperature of 80°C for 60 minutes. After dyeing, wash and dry.

Embodiment three:

(1) Cationic modified liquid treatment

The formula of the cationic modifier solution is as follows: the cationic modifier dosage is 21 g/liter, the bath ratio is 1:20, the cotton fabric is treated for 5 minutes at room temperature, and then the temperature rises to 70 DEG C at a heating rate of 2 DEG C/min, adding 6 g/L caustic soda, treated at 70°C for 60 minutes, after modification treatment, wash the fabric with cold water.

(2) Dyeing with natural dyes

Cotton fabrics treated with the above cationic modification solution were dyed with natural dyes copper sodium chlorophyllin, annatto and gardenia yellow; at the same time, the same dyeing process was used to dye the cotton fabric without cationic modification solution as it was deal with. The formula of the dyeing solution is: the weight percent concentration (o.w.f) of the dye relative to the fabric is 2%, the bath ratio is 1:20, at room temperature, the cotton fabric treated with the above-mentioned treatment solution is dyed for 10 minutes, and then dyed at 2°C. The heating rate per minute was raised to 80°C, and the dyeing was carried out at a temperature of 80°C for 60 minutes. After dyeing, wash and dry.

Embodiment four:

(1) Cationic modified liquid treatment

The formula of the cationic modifier solution is as follows: the dosage of the cationic modifier is 25 g/L, the bath ratio is 1:20, the cotton fabric is treated for 5 minutes at room temperature, and then the temperature is raised to 70 DEG C at a heating rate of 2 DEG C/min. 7 g/L caustic soda, treated at 70°C for 60 minutes, after modification, wash the fabric with cold water.

(2) Dyeing with natural dyes

Cotton fabrics treated with the above cationic modification solution were dyed with natural dyes copper sodium chlorophyllin, annatto and gardenia yellow; at the same time, the same dyeing process was used to dye the cotton fabric without cationic modification solution as it was deal with. The formula of the dyeing solution is: the weight percent concentration (o.w.f) of the dye relative to the fabric is 2%, the bath ratio is 1:20, at room temperature, the cotton fabric treated with the above-mentioned treatment solution is dyed for 10 minutes, and then dyed at 2°C. The heating rate per minute was raised to 80°C, and the dyeing was carried out at a temperature of 80°C for 60 minutes. After dyeing, wash and dry.

Embodiment five:

(1) Cationic modified liquid treatment

The formula of the cationic modifier solution is as follows: the dosage of cationic modifier is 18 g/liter, the liquor ratio: 1:20, the cotton fabric is treated for 5 minutes at room temperature, and then the temperature is raised to 60 DEG C at a rate of 2 DEG C/min, adding 5 g/L caustic soda, treated at 60°C for 60 minutes, after modification treatment, wash the fabric with cold water.

(2) Dyeing with natural dyes

Cotton fabrics treated with the above cationic modification solution were dyed with natural dyes copper sodium chlorophyllin, annatto and gardenia yellow; at the same time, the same dyeing process was used to dye the cotton fabric without cationic modification solution as it was deal with. The formula of the dyeing solution is: the weight percent concentration (o.w.f) of the dye relative to the fabric is 2%, the bath ratio is 1:20, at room temperature, the cotton fabric treated with the above-mentioned treatment solution is dyed for 10 minutes, and then dyed at 2°C. The heating rate per minute was raised to 80°C, and the dyeing was carried out at a temperature of 80°C for 60 minutes. After dyeing, wash and dry.

Embodiment six:

(1) Cationic modified liquid treatment

The formula of the cationic modifier solution is as follows: the dosage of cationic modifier is 18 g/liter, the bath ratio is 1:20, the cotton fabric is treated for 5 minutes at room temperature, and then the temperature is raised to 80 DEG C at a heating rate of 2 DEG C/min, and the 5 g/L caustic soda, treated at 80°C for 60 minutes, after modification, wash the fabric with cold water.

(2) Dyeing with natural dyes

Cotton fabrics treated with the above cationic modification solution were dyed with natural dyes copper sodium chlorophyllin, annatto and gardenia yellow; at the same time, the same dyeing process was used to dye the cotton fabric without cationic modification solution as it was deal with. The formula of the dyeing solution is: the weight percent concentration (o.w.f) of the dye relative to the fabric is 2%, the bath ratio is 1:20, at room temperature, the cotton fabric treated by the above-mentioned treatment solution is dyed for 15 minutes, and then dyed at 2°C. The heating rate per minute was raised to 80°C, and the dyeing was carried out at a temperature of 80°C for 60 minutes. After dyeing, wash and dry.

Embodiment seven:

(1) Cationic modified liquid treatment

The formula of the cationic modifier solution is as follows: the cationic modifier dosage is 18 g/L, the bath ratio is 1:20, the cotton fabric is treated for 5 minutes at room temperature, and then the temperature is increased to 70 DEG C at a heating rate of 2 DEG C/min, and the 5 g/L caustic soda, treated at 70°C for 30 minutes, after modification, wash the fabric with cold water.

(2) Dyeing with natural dyes

Cotton fabrics treated with the above cationic modification solution were dyed with natural dyes copper sodium chlorophyllin, annatto and gardenia yellow; at the same time, the same dyeing process was used to dye the cotton fabric without cationic modification solution as it was deal with. The formula of the dyeing solution is: the weight percent concentration (o.w.f) of the dye relative to the fabric is 2%, the bath ratio is 1:20, at room temperature, the cotton fabric treated by the above-mentioned treatment solution is dyed for 15 minutes, and then dyed at 2°C. The heating rate per minute was raised to 80°C, and the dyeing was carried out at a temperature of 80°C for 60 minutes. After dyeing, wash and dry.

Implementation effect of the present invention

The cotton fabric treated in the above examples 1-7 was tested with a DataColor tester for K/S value (K/S value represents the color depth of the fabric surface). Fig. 1 is a comparison of the apparent color depth of the cotton fabric obtained by dyeing the cotton fabric treated with the cationic modifier and the cotton fabric not treated with the modifier using the technical scheme of Examples 1-7. It can be seen from Figure 1 that the color depth of the cotton fabric modified by the cationic modifier is obviously thicker than that of the unmodified cotton fabric after being dyed with natural dyes. This shows that adopting the technology provided by the invention can make natural dyes obtain higher dye uptake on cotton fabrics. It can be seen from Figure 2 and Figure 3 that the cotton fabric modified by this process is dyed with natural dyes, and the fastness to washing (according to GB/T3921.1-1997) and fastness to rubbing (according to GB/T3920-1997) are both Can reach level 3 or above. This illustrates that the cotton fabric processed by the dyeing technology of the present invention has the advantages of washability and friction resistance in the dyeing performance of its finished product.

Claims (3)

1. natural dye dying method based on cotton fiber modification is characterized in that treatment process steps is as follows:

(1) with containing the modifier of cation group and the modification liquid that caustic soda is prepared into, cotton fiber is carried out modification handle, wherein, cation modifier consumption 15～25 grams per liters, caustic soda consumption 2～8 grams per liters, modification treatment temperature are 60～80 ℃, and the time is 30～60 minutes;

(2) under the room temperature condition, earlier COTTON FABRIC was handled 10 minutes in 15～25 grams per liter cation modifiers, be warming up to 60～80 ℃ with 1～2 ℃/minute programming rate again, gradation adds 2～8 grams per liter caustic soda, continues processing 30～60 minutes;

(3) with the COTTON FABRIC after the modification at ambient temperature prior to dyeing in the natural dye dye liquor 5～20 minutes, be warming up to 70～98 ℃ with 1～2 ℃/minute programming rate again, continue dyeing 30～90 minutes;

(4) finish the natural dye dying of cotton fiber after the washing.

2. the natural dye dying method based on cotton fiber modification according to claim 1, it is characterized in that: cation modifier contains cation group, is selected from the amine or quaternary ammonium compound, n-methylolacrylamide compound, nitrogen-containing heterocycle compound and the amino polymer that contain epoxide group.

3. the natural dye dying method based on cotton fiber modification according to claim 1, it is characterized in that: during natural dye dying, bath raio=1: 5～1: 40,70～98 ℃ of dyeing temperatures, dyeing time 30～90 minutes, described bath raio is meant fabric quality: the dye liquor quality.

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