CN113863008A - Modified cotton fabric and preparation method and application thereof - Google Patents
Modified cotton fabric and preparation method and application thereof Download PDFInfo
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- CN113863008A CN113863008A CN202111111093.1A CN202111111093A CN113863008A CN 113863008 A CN113863008 A CN 113863008A CN 202111111093 A CN202111111093 A CN 202111111093A CN 113863008 A CN113863008 A CN 113863008A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/01—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural macromolecular compounds or derivatives thereof
- D06M15/03—Polysaccharides or derivatives thereof
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/07—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof
- D06M11/30—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof with oxides of halogens, oxyacids of halogens or their salts, e.g. with perchlorates
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
Abstract
The invention belongs to the technical field of textile, and discloses a modified cotton fabric, a preparation method and application thereof, wherein the modified cotton fabric comprises 55.7-59.3% of cotton fabric, and the fixation rate is 53.7-57.4%. The preparation method of the modified cotton fabric comprises the following steps: oxidizing the cotton fabric by using an oxidant to obtain an oxidized cotton fabric; and (3) performing modification treatment on the oxidized cotton fabric by using chitosan to obtain the modified cotton fabric. According to the invention, the cotton fabric is oxidized by the oxidant to form dialdehyde cellulose (C ═ O) in the cotton fabric, and then the oxidized cotton fabric is treated by the chitosan, so that the dialdehyde cellulose (C ═ O) and the chitosan can react to form Schiff base covalent groups (C ═ N double bonds), and the Schiff base covalent groups are firmly combined by chemical bonds, so that the dyeing property of the modified cotton fabric is obviously improved.
Description
Technical Field
The invention belongs to the technical field of textile, and particularly relates to a modified cotton fabric and a preparation method and application thereof.
Background
Cotton fabrics occupy a high market share in the textile and clothing industry, and are particularly relevant to the life of people. The cotton fabric is dyed by a non-separable dyeing technology. The reactive dye is complete in color spectrum, bright in color, excellent in fastness and low in cost, and is the most important dye for dyeing cotton fabrics at present. However, the reactive dyes belong to the class of anionic dyes and include reactive groups, hydrophilic groups and dye parent moieties, wherein the hydrophilic groups are generally composed of sodium sulfonate, hydroxyl, amino, etc., and the sulfonate groups contribute significantly to the hydrophilicity of the dye. The presence of sulfonic acid groups helps the reactive dye to dissolve in water, so that the dyeing process can be carried out in an aqueous solution; however, the dye matrix is negatively charged due to the dissociation of the sodium sulfonate, so that the binding capacity to fiber negative ions is reduced, the dye matrix is easy to hydrate to form hydrate and aggregate into a micelle structure, the effective concentration of the dye negative ions is reduced, and the dye uptake and the fixation rate of the reactive dye dyed cotton fabric are low.
In order to solve the problem, a large amount of inorganic salt is usually added in the dyeing process to promote dyeing in the prior art, but the high-salt-content wastewater generated in the dyeing process is difficult to treat and has great harm to the environment, and the problem that how to improve the dye uptake and the color fixing rate of the reactive dye dyed cotton fabric is urgently to be solved is solved.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. The modified cotton fabric has the dye uptake of 55.7-59.3%, the color fixing rate of 53.7-57.4%, the K/S value of 4.84-4.98, the dry rubbing color fastness of 4-5 grade, the wet rubbing color fastness of 3-4 grade, good dyeing performance and high color fastness.
The first aspect of the invention provides a modified cotton fabric, which has the dye uptake of 55.7-59.3%, the color fixing rate of 53.7-57.4%, the K/S value of 4.84-4.98, the dry rubbing color fastness of 4-5 grade and the wet rubbing color fastness of 3-4 grade.
The second aspect of the invention provides a preparation method of the modified cotton fabric, which comprises the following steps:
oxidizing the cotton fabric by using an oxidant to obtain an oxidized cotton fabric;
and (3) carrying out modification treatment on the oxidized cotton fabric by using chitosan to obtain the modified cotton fabric.
Preferably, the oxidizing agent comprises periodic acid, periodate or hydrogen peroxide; the periodate salt comprises sodium periodate or potassium periodate.
Preferably, the oxidizing agent is a sodium periodate solution, and the concentration of the sodium periodate solution is 1.2g/L-10 g/L.
Preferably, the concentration of the sodium periodate solution is 1.2g/L to 1.8 g/L.
Preferably, the molecular weight of the chitosan is 50000Da-200000 Da.
Preferably, the molecular weight of the chitosan is 100000Da to 200000 Da.
Preferably, the bath ratio of the oxidant to the cotton fabric is 25-30: 1.
Preferably, the bath ratio of the chitosan to the oxidized cotton fabric is 5-10: 1.
Specifically, the preparation method of the modified cotton fabric comprises the following steps:
oxidation treatment: mixing a sodium periodate solution with the concentration of 1.2-10 g/L and cotton fabrics according to the bath ratio of 25-30:1 at the temperature of 50-60 ℃, stirring for 50-70min, carrying out the whole reaction process under the condition of no light, fully washing the treated cotton fabrics in deionized water after the reaction is finished, soaking for about 24h, and removing the sodium periodate to obtain oxidized cotton fabrics;
modification treatment: placing the cotton oxide fabric into a chitosan solution with the concentration of 8g/L-12g/L according to the bath ratio of 1 (5-10), stirring for 100min-120min at the temperature of 50-60 ℃, washing for several times by using deionized water, and then drying for 5h-6h in a vacuum oven at the temperature of 60-65 ℃ to obtain the modified cotton fabric.
The preparation method of the chitosan solution comprises the following steps:
adding chitosan into 2 wt% acetic acid solution, placing in an infrared dyeing machine, and stirring at constant speed and constant temperature at 55-65 deg.C for 60-70 min to obtain chitosan solution. The specific concentration of the chitosan solution can be prepared by adjusting the mass of the chitosan and the volume of the acetic acid solution.
A third aspect of the invention provides the use of said modified cotton fabric in clothing.
Preferably, a garment comprises the modified cotton fabric of the invention.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the cotton fabric is oxidized by the oxidant, dialdehyde cellulose (C ═ O) is formed in the cotton fabric, the oxidized cotton fabric is treated by the chitosan, the dialdehyde cellulose (C ═ O) and the chitosan can react to form Schiff base covalent groups (C ═ N double bonds), and the Schiff base covalent groups are firmly combined by chemical bonds, so that the dyeing property of the modified cotton fabric is obviously improved; the modified cotton fabric has the dye uptake of 55.7-59.3%, the color fixing rate of 53.7-57.4%, the K/S value of 4.84-4.98, the dry rubbing color fastness of 4-5 grade, the wet rubbing color fastness of 3-4 grade, good dyeing performance and high color fastness.
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are not intended to limit the scope of the claimed invention.
The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.
Example 1
A preparation method of a modified cotton fabric comprises the following steps:
(1) the specific process of decontamination treatment is as follows: respectively putting the cotton fabric samples into a strong detergent with a bath ratio of 10:1 and a concentration of 2g/L, treating for 10 minutes at 95 ℃, continuously stirring, and fully washing for a plurality of times by using deionized water after the treatment to remove residual liquid on the cotton fabric;
(2) constant weight treatment before oxidation: drying the cotton fabric sample subjected to decontamination treatment in an oven at 110 ℃ for 180 min; after drying, putting the mixture into a dryer for vacuum cooling for 30min, and weighing and recording data (m)1) (ii) a Then putting the sample into an oven, drying for 60min at 110 ℃, putting the sample into a dryer for vacuum cooling for 60min after drying, weighing and recording data (m)2) According to the error formula W ═ m1-m2)/m1X 100%. Calculating the error before and after, and repeating the previous operation until W is less than or equal to 0.03 percent to obtain a cotton fabric sample with constant weight;
(3) oxidation treatment: mixing a sodium periodate solution with the concentration of 1.6g/L and cotton fabrics according to the bath ratio of 30:1 at the temperature of 60 ℃, stirring for 60min, carrying out the whole reaction process under a dark condition, fully washing the treated cotton fabrics in deionized water after the reaction is finished, soaking for about 24h, and removing the sodium periodate to obtain oxidized cotton fabrics;
(4) constant weight treatment after oxidation: drying the oxidized cotton fabric sample in an oven at 110 ℃ for 180 min; after drying, putting the mixture into a dryer for vacuum cooling for 30min, and weighing and recording data (m)1) (ii) a Then putting the sample into an oven, drying for 60min at 110 ℃, putting the sample into a dryer for vacuum cooling for 60min after drying, weighing and recording data (m)2) According to the error formula W ═ m1-m2)/m1X 100%. Calculating the error before and after the operation is repeated until the W is less than or equal to 0.03 percent, and obtaining an oxidized cotton fabric sample with constant weight;
(5) modification treatment: placing the oxidized cotton fabric into a chitosan solution with the concentration of 10g/L (the molecular weight of chitosan is 200000Da) according to the bath ratio of 1:10, stirring for 120min at the temperature of 60 ℃, washing with deionized water for several times, and drying for 6h in a vacuum oven at the temperature of 60 ℃ to obtain the modified cotton fabric.
Example 2
A preparation method of a modified cotton fabric comprises the following steps:
(1) the desmutting treatment step was the same as that of example 1;
(2) the pre-oxidation constant weight treatment step was the same as the pre-oxidation constant weight treatment step of example 1;
(3) oxidation treatment: mixing a sodium periodate solution with the concentration of 10g/L and cotton fabrics according to the bath ratio of 30:1 at the temperature of 50 ℃, stirring for 60min, carrying out the whole reaction process under a dark condition, fully washing the treated cotton fabrics in deionized water after the reaction is finished, soaking for about 24h, and removing the sodium periodate to obtain oxidized cotton fabrics;
(4) the post-oxidation constant weight treatment step was the same as the post-oxidation constant weight treatment step of example 1;
(5) modification treatment: placing the oxidized cotton fabric into a chitosan solution with the concentration of 8g/L (the molecular weight of chitosan is 100000Da) according to the bath ratio of 1:10, stirring for 120min at the temperature of 60 ℃, washing with deionized water for several times, and drying for 6h in a vacuum oven at the temperature of 60 ℃ to obtain the modified cotton fabric.
Example 3
A preparation method of a modified cotton fabric comprises the following steps:
(1) the desmutting treatment step was the same as that of example 1;
(2) the pre-oxidation constant weight treatment step was the same as the pre-oxidation constant weight treatment step of example 1;
(3) oxidation treatment: mixing a sodium periodate solution with the concentration of 4g/L and a cotton fabric according to the bath ratio of 25:1 at the temperature of 55 ℃, stirring for 70min, carrying out the whole reaction process under a dark condition, fully washing the treated cotton fabric in deionized water after the reaction is finished, soaking for about 24h, and removing the sodium periodate to obtain an oxidized cotton fabric;
(4) the post-oxidation constant weight treatment step was the same as the post-oxidation constant weight treatment step of example 1;
(5) modification treatment: placing the oxidized cotton fabric into a chitosan solution with the concentration of 12g/L (the molecular weight of chitosan is 50000Da) according to the bath ratio of 1:5, stirring for 110min at the temperature of 55 ℃, washing with deionized water for several times, and drying for 5h in a vacuum oven at the temperature of 65 ℃ to obtain the modified cotton fabric.
Example 4
A preparation method of a modified cotton fabric comprises the following steps:
(1) the desmutting treatment step was the same as that of example 1;
(2) the pre-oxidation constant weight treatment step was the same as the pre-oxidation constant weight treatment step of example 1;
(3) oxidation treatment: mixing a sodium periodate solution with the concentration of 1.8g/L and cotton fabrics according to the bath ratio of 30:1 at the temperature of 50 ℃, stirring for 50min, carrying out the whole reaction process under a dark condition, fully washing the treated cotton fabrics in deionized water after the reaction is finished, soaking for about 24h, and removing the sodium periodate to obtain oxidized cotton fabrics;
(4) the post-oxidation constant weight treatment step was the same as the post-oxidation constant weight treatment step of example 1;
(5) modification treatment: placing the oxidized cotton fabric into a chitosan solution with the concentration of 10g/L (the molecular weight of chitosan is 200000Da) according to the bath ratio of 1:10, stirring for 120min under the condition of 50 ℃, washing with deionized water for several times, and then drying in a vacuum oven at 60 ℃ for 6h to obtain the modified cotton fabric.
Example 5
A preparation method of a modified cotton fabric comprises the following steps:
(1) the desmutting treatment step was the same as that of example 1;
(2) the pre-oxidation constant weight treatment step was the same as the pre-oxidation constant weight treatment step of example 1;
(3) oxidation treatment: mixing a sodium periodate solution with the concentration of 1.2g/L and cotton fabrics according to the bath ratio of 30:1 at the temperature of 60 ℃, stirring for 60min, carrying out the whole reaction process under a dark condition, fully washing the treated cotton fabrics in deionized water after the reaction is finished, soaking for about 24h, and removing the sodium periodate to obtain oxidized cotton fabrics;
(4) the post-oxidation constant weight treatment step was the same as the post-oxidation constant weight treatment step of example 1;
(5) modification treatment: placing the oxidized cotton fabric into a chitosan solution with the concentration of 10g/L (the molecular weight of chitosan is 200000Da) according to the bath ratio of 1:10, stirring for 120min at the temperature of 60 ℃, washing with deionized water for several times, and drying for 6h in a vacuum oven at the temperature of 60 ℃ to obtain the modified cotton fabric.
Weight loss rate test
The structure and the performance of the cotton fabric treated by the oxidant can be damaged to a certain degree, and can be degraded, and the weight loss rate can be expressed. Examples 1-5 during the oxidation process, sodium periodate with different concentrations had some erosion to the cotton fiber, resulting in weight loss of the cotton fiber, and thus, the weight loss rate can qualitatively represent the degradation degree of the cotton fiber in the oxidation reaction. Table 1 below shows the results of drying the cotton fabrics of examples 1-5 before and after oxidation to constant weight.
TABLE 1
As can be seen from the data in Table 1, the weight loss rate of the cotton fabric after oxidation treatment is gradually increased along with the increase of the concentration of sodium periodate, and when the concentration of the sodium periodate is increased to 10g/L, the weight loss rate of the cotton fabric reaches 4.62 percent; meanwhile, dialdehyde cellulose generated in the cotton fabric also shows an increasing trend along with the increase of the concentration of the sodium periodate. Therefore, the quality of the cotton fabric is ensured, and the generation of dialdehyde cellulose in the internal structure of the cotton fabric is also considered, so that a better effect can be obtained when chitosan is coated and polymerized subsequently.
In addition, as the concentration of sodium periodate is increased, the tensile breaking strength property of the cotton fabric is changed. It is well known that tensile breaking strength properties are one of the most important key factors affecting cotton fabrics and even ready-made garments. Therefore, the improvement of dyeing performance cannot be pursued for one side, and the performance of the modified cotton fabric is much inferior to that of the unmodified cotton fabric. In order to obtain the best effect of the oxidized cotton fabric, so that the dyeing performance of the finally modified cotton fabric is improved to a certain extent, and the performance of the original cotton fabric in daily application and production can not be lost, the tensile breaking strength performance of the oxidized cotton fabric needs to be researched. Because oxidation of sodium periodate may damage to some extent the crystalline structure of the internal fibers of cotton fabric, thereby reducing the tensile breaking strength properties. Meanwhile, the concentration of the sodium periodate can influence the generation of dialdehyde cellulose, and directly influence the final effect of coating the chitosan on the polycotton fabric, thereby influencing the dyeing performance of the final cotton fabric. Therefore, the relationship between the concentration of sodium periodate and the tensile breaking strength property of cotton fabric is intensively studied.
Tensile breaking strength property test
The oxidized cotton fabrics obtained by the oxidation treatments of examples 1 to 5 were respectively trimmed to 5cm × 25cm in size, and the respective samples were tested for breaking strength (as shown in table 2) and breaking elongation (as shown in table 3).
And (3) testing conditions are as follows:
testing by using a YG065 type electronic fabric strength tester; the temperature is 20 ℃, the humidity is 65%, the working length is 5cm multiplied by 25cm, the working length is 0.05cN/dtex, and the drawing speed is 60 mm/min.
TABLE 2
As can be seen from the data of table 2, as the concentration of the sodium periodate solution increases, the breaking strength of the oxidized cotton fabric gradually decreases, and the breaking strength loss rate gradually increases. Particularly, when the concentration exceeds 4.0g/L, the loss rate rises suddenly, which shows that the concentration of the oxidizing agent has great influence on the breaking strength of the cotton fabric.
TABLE 3
As can be seen from the data in table 3, the elongation at break of the oxidized cotton fabric gradually decreased and the elongation at break loss gradually increased with increasing concentration of the sodium periodate solution. Particularly, when the concentration exceeds 4.0g/L, the loss rate rises suddenly, which shows that the concentration of the oxidizing agent has great influence on the breaking elongation of the cotton fabric.
It can be seen from the data in tables 2 and 3 that, mainly in the case of a relatively low concentration of the sodium periodate solution, the main region where the oxidation reaction occurs is in the amorphous region of the cotton fiber, and the internal crystalline structure is not significantly affected, so that the mechanical properties of the fiber are not damaged to a significant extent. With the increase of the concentration of the sodium periodate solution, on one hand, the surface and the interior of a fiber crystallization area are gradually subjected to oxidation reaction, the arrangement and the stacking of the original cotton fiber molecules are changed, and the bonding force between the fiber molecules is weakened; on the other hand, as the oxidation reaction proceeds further, the secondary bond bonding such as hydrogen bonds and van der waals forces within and between the molecular chains of the fiber are gradually weakened, and the internal crystal structure of the cotton fiber is broken, resulting in a decrease in the tensile breaking strength of the fiber.
By combining the analysis, in order to ensure the weight loss rate and the tensile breaking strength performance of the oxidized cotton fabric and simultaneously ensure that the modified cotton fabric has the generation of dialdehyde cellulose, the optimal concentration of the sodium periodate solution is 1.6g/L, and the cotton fabric is subjected to oxidation treatment for 60min at the temperature of 60 ℃.
Comparative example 1 (difference from example 1 in that cotton fabric was not treated with sodium periodate)
The preparation method of the cotton fabric comprises the following steps:
(1) the desmutting treatment step was the same as that of example 1;
(2) modification treatment: placing the cotton fabric in 10g/L chitosan solution (molecular weight of chitosan is 200000Da) according to bath ratio of 1:10, stirring at 60 deg.C for 120min, washing with deionized water for several times, and drying in 60 deg.C vacuum oven for 6 hr.
Comparative example 2 (difference from example 1 in that cotton fabric was not treated with chitosan)
The preparation method of the cotton fabric comprises the following steps:
(1) the desmutting treatment step was the same as that of example 1;
(2) oxidation treatment: mixing a sodium periodate solution with the concentration of 1.6g/L and cotton fabrics according to the bath ratio of 30:1 at the temperature of 60 ℃, stirring for 60min, carrying out the whole reaction process under the condition of no light, fully washing the treated cotton fabrics in deionized water after the reaction is finished, soaking for about 24h, and removing the sodium periodate.
Dyeing Property test
Dyeing prescription: 1% owf of reactive dye, 30:1 of bath ratio, 30g/L of salt and 20g/L of sodium carbonate.
And (3) dyeing:
a) preparation of the experiment: the modified cotton fabrics prepared in examples 1-5 and comparative examples 1-2 were used as test samples, while the ordinary untreated cotton fabric was used as a control sample. Weighing the required reactive dye, salt and sodium carbonate according to the dyeing prescription and the weight of the test sample, measuring the water required by the experiment, and preparing a dye solution;
b) dyeing treatment: and respectively putting the test samples into the prepared dye solution at room temperature, wherein the dyeing temperature is 60 ℃, the treatment time is 60min, and the stirring is continuously carried out, so that uneven dyeing and color difference are prevented.
The post-dyeing treatment comprises washing and soaping, wherein the washing formula comprises: the bath ratio is 10:1, the temperature is room temperature (20-30 ℃), and the time is 10 min; soap washing formula: the bath ratio is 20:1, the concentration of the soaping liquid is 2g/L, the soaping time is 10min, and the soaping temperature is 95 ℃.
The dyeing post-treatment mainly comprises three steps: taking out the dyed cotton fabric, and cleaning the cotton fabric with 20mL of clean water, wherein the purpose of cleaning is to wash off dyes which are stuck to the cotton fabric and do not completely react in the dyeing process; secondly, soaping with 40mL of soaping liquid at 95 ℃ to wash off loose color and enable the loose color to be better diffused to the surface of the fiber; in the third step, the washing is carried out with 20mL of clean water, so as to wash out the soap lotion.
The residual solutions after the three steps of dyeing treatment are poured together, the volume and the absorbance are respectively measured, and the dyeing rate and the fixation rate are calculated, and the results are shown in table 4.
1. Dye uptake test
The absorbances of the dye before and after dyeing at the maximum absorption wavelength were measured with a V-5000 visible spectrophotometer, respectively. After dyeing, the percentage of the dye amount on the finished product to the dye in the original dye liquor is called the dye-uptake.
The formula is as follows:
in the formula:A0denotes the absorbance of the stock dye, A1Represents the absorbance of the remaining solution after dyeing;
V0denotes the volume of the stock dye liquor, V1The volume of the remaining solution after dyeing is indicated.
2. Fixation test
The absorbances of the dye before and after dyeing at the maximum absorption wavelength were measured with a V-5000 visible spectrophotometer, respectively. The definition of the fixation rate is the ratio of the dye amount dyed on the fiber to the total dye amount in the original dye solution after the finished product is subjected to fixation treatment.
The formula is as follows:
in the formula: a. the0Denotes the absorbance of the stock dye, A1Represents the absorbance of the remaining solution after dyeing, A2Showing the absorbance of a mixed solution of a soap washing solution and a water washing solution;
V0denotes the volume of the stock dye liquor, V1Denotes the volume of the remaining solution after dyeing, V2The volume of the mixture of the soap wash solution and the water wash solution is shown.
TABLE 4
| Group of | Sodium periodate concentration | Molecular weight of chitosan | Concentration of chitosan | Dye uptake (%) | Fixation ratio (%) |
| Control group | 0 | 0 | 0 | 52.7 | 50.4 |
| Example 1 | 1.6g/L | 20 ten thousand | 10g/L | 59.3 | 57.4 |
| Example 2 | 10g/L | 10 ten thousand | 8g/L | 57.5 | 55.6 |
| Example 3 | 4g/L | 5 ten thousand | 12g/L | 58.0 | 56.1 |
| Example 4 | 1.8g/L | 20 ten thousand | 10g/L | 56.4 | 53.9 |
| Example 5 | 1.2g/L | 20 ten thousand | 10g/L | 55.7 | 53.7 |
| Comparative example 1 | 0 | 20 ten thousand | 10g/L | 53.2 | 51.3 |
| Comparative example 2 | 1.6g/L | 0 | 0 | 49.4 | 47.2 |
As can be seen from the data in Table 4, the cotton fabrics obtained in examples 1-5 and comparative example 1 both had higher exhaustion and fixation than the control, while the cotton fabric obtained in comparative example 2 was only treated with sodium periodate and both had lower exhaustion and fixation than the control. The cotton fabrics prepared in the examples 1 to 5 have higher dye uptake and color fixing rate than those prepared in the comparative examples 1 to 2, which shows that the dyeing property of the modified cotton fabrics is obviously improved after the cotton fabrics are modified by sodium periodate and chitosan. In addition, the comparison between examples 1-5 shows that when the concentration of sodium periodate is 1.6g/L, the dye uptake and the fixation rate are the highest, i.e. the cotton fabric prepared in example 1 has the best dyeing performance.
K/S value test
The K/S value of the dyed sample was determined using a computer color measuring and matching instrument model Ci7800 according to the instrument protocol.
The air-dried finished products of the cotton fabrics subjected to color fixing treatment in the examples 1-5 and the comparative examples 1-2 are respectively used as test samples, and meanwhile, the common untreated cotton fabrics are used as control samples. The samples were measured in a color measuring and matching instrument that had been set up, each sample was measured in three different directions, the average was calculated, the final results were recorded, and the results are shown in table 5.
TABLE 5
| Group of | K/S value |
| Control group | 3.88 |
| Example 1 | 4.98 |
| Example 2 | 4.90 |
| Example 3 | 4.92 |
| Example 4 | 4.86 |
| Example 5 | 4.84 |
| Comparative example 1 | 3.91 |
| Comparative example 2 | 3.59 |
As can be seen from the data in Table 5, the change rule of the K/S value of the fabric is basically consistent with the dye uptake and the fixation rate.
4. Colour fastness to rubbing test
The color fastness to rubbing is tested according to the Standard GB/T3920-
The cotton fabrics prepared in examples 1 to 5 were used as test samples, while the ordinary untreated cotton fabric was used as a control sample. The sample was cut into a size of 50mm × 150mm, 10 cycles of rubbing were performed by a test machine, dry rubbing and wet rubbing were performed respectively, and then the number of staining levels was evaluated, and the results are shown in table 6.
TABLE 6
| Group of | Colour fastness to dry rubbing | Color fastness to wet rubbing |
| Control group | 3-4 | 1-2 |
| Example 1 | 4-5 | 3-4 |
| Example 2 | 4-5 | 3-4 |
| Example 3 | 4-5 | 3-4 |
| Example 4 | 4-5 | 3-4 |
| Example 5 | 4-5 | 3-4 |
As can be seen from the data in Table 6, in examples 1-5, the dry and wet rubbing fastness of the cotton fabric is increased compared with the control group after the modification treatment with sodium periodate and chitosan, and especially the wet rubbing fastness is improved more obviously.
5. Moisture absorption Performance test
And (3) experimental operation: the cotton fabrics prepared in the example 1, the comparative example 1 and the comparative example 2 are used as samples, meanwhile, common untreated cotton fabrics are used as control group samples, the samples are trimmed and arranged into samples with the size of 2.5cm multiplied by 30cm, the samples are vertically hung, a 3g tension clamp is arranged at the position 8-10mm of the lower end of each sample, the lower end of each sample is immersed in a potassium permanganate aqueous solution, the treatment temperature is 27 +/-2 ℃, the wetting height of the samples is measured after 30min, and the results are shown in the table 7.
TABLE 7
The data in table 7 show that, compared with the control group and the comparative examples 1-2, the moisture absorption performance of the cotton fabric is remarkably improved after the treatment of the sodium periodate and the chitosan in the example 1; compared with the control group, the moisture absorption performance of the cotton fabric is improved by only treating the chitosan or the sodium periodate in the comparative example 1 and the comparative example 2, but the improvement amplitude is smaller.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (10)
1. The modified cotton fabric is characterized in that the dye uptake of the modified cotton fabric is 55.7-59.3%, and the color fixing rate is 53.7-57.4%.
2. A process for the preparation of a modified cotton fabric according to claim 1, characterized in that it comprises the following steps:
oxidizing the cotton fabric by using an oxidant to obtain an oxidized cotton fabric;
and (3) carrying out modification treatment on the oxidized cotton fabric by using chitosan to obtain the modified cotton fabric.
3. The method of claim 2, wherein the oxidizing agent comprises periodic acid, periodate, or hydrogen peroxide; the periodate salt comprises sodium periodate or potassium periodate.
4. The method according to claim 3, wherein the oxidizing agent is a sodium periodate solution having a concentration of 1.2g/L to 10 g/L.
5. The method according to claim 4, wherein the concentration of the sodium periodate solution is 1.2g/L to 1.8 g/L.
6. The method according to claim 2, wherein the chitosan has a molecular weight of 50000Da to 200000 Da.
7. The method of claim 2, wherein the bath ratio of the oxidizing agent to the cotton fabric is 25-30: 1.
8. The method of claim 2, wherein the bath ratio of the chitosan to the oxidized cotton fabric is 5-10: 1.
9. Use of the modified cotton fabric of claim 1 in clothing.
10. A garment comprising the modified cotton fabric of claim 1.
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