CN111851097A - Method for improving cotton fabric dye uptake of direct dye - Google Patents
Method for improving cotton fabric dye uptake of direct dye Download PDFInfo
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- CN111851097A CN111851097A CN202010816760.5A CN202010816760A CN111851097A CN 111851097 A CN111851097 A CN 111851097A CN 202010816760 A CN202010816760 A CN 202010816760A CN 111851097 A CN111851097 A CN 111851097A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/58—Material containing hydroxyl groups
- D06P3/60—Natural or regenerated cellulose
- D06P3/62—Natural or regenerated cellulose using direct dyes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/46—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing natural macromolecular substances or derivatives thereof
- D06P1/48—Derivatives of carbohydrates
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/653—Nitrogen-free carboxylic acids or their salts
- D06P1/6533—Aliphatic, araliphatic or cycloaliphatic
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/002—Locally enhancing dye affinity of a textile material by chemical means
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Abstract
The invention relates to the field of textile printing and dyeing, and discloses a method for improving the dye uptake of direct dyes to cotton fabrics. The method comprises the following steps: (1) treating cotton fabric with chitosan solution: completely immersing the pretreated cotton fabric in a chitosan solution, then removing the redundant solution by rolling, prebaking, heating for curing, washing in a weak acid solution, and drying; (2) dyeing: placing the treated cotton fabric obtained in the step (1) in a direct dye solution for stirring, then heating and preserving heat, and then soaping and drying the cotton fabric; wherein, in the step (1), the preparation method of the chitosan solution comprises the following steps: dissolving chitosan in citric acid solution with concentration of 40-50 g/L; the concentration of the chitosan solution is 10-15 g/L. According to the method, the citric acid is used as a cross-linking agent, and the chitosan is cross-linked to the cotton fabric, so that the dye uptake of the direct dye to the cotton fabric is improved.
Description
Technical Field
The invention relates to the field of textile printing and dyeing, in particular to a method for improving the dye uptake of direct dyes to cotton fabrics.
Background
The direct dye has poor affinity to cellulose, so that high dye uptake is difficult to obtain in the dyeing of cotton fabrics, the apparent color depth value (K/S) of the dyed fabrics is low, and deep color is difficult to dye.
Cationic modified cotton fabrics as a solution can alleviate this problem. The technology dyes the grafted cotton fabric under a specific pH value by using a cationic modifier such as 3-chloro-2-hydroxypropyl trimethyl ammonium chloride (CHPTAC) on the surface of the cotton fiber, and performs electrostatic attraction action on the amine group in the cationic modifier under an acidic condition to protonate positively charged groups and the sulfonate and carboxylate groups which are negatively charged in direct dyes, so that the combination degree of the dyes and the cotton fiber is improved, and the aim of improving the dye uptake of the direct dyes on the cotton fabric is fulfilled.
Although the technology can greatly improve the dye uptake of direct dyes, the common cationic modifier has extremely strong pungent smell and strong toxicity, thereby causing health threat to operators. Meanwhile, the wastewater produced by the process, if not strictly treated, is likely to cause serious pollution to the external water environment after being discharged.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a method for improving the dye uptake of direct dyes to cotton fabrics.
In order to achieve the above object, the present invention provides a method for increasing the dye uptake of direct dyes to cotton fabrics, comprising the steps of:
(1) treating cotton fabric with chitosan solution: completely immersing the pretreated cotton fabric in a chitosan solution, then removing the redundant solution by rolling, prebaking, heating for curing, washing in a weak acid solution, and drying;
(2) dyeing: placing the treated cotton fabric obtained in the step (1) in a direct dye solution for stirring, then heating and preserving heat, and then soaping and drying the cotton fabric;
wherein, in the step (1), the preparation method of the chitosan solution comprises the following steps: dissolving chitosan in citric acid solution with concentration of 40-50 g/L;
the concentration of the chitosan solution is 10-15 g/L.
Preferably, in step (1), the pretreatment is bleaching and scouring.
Preferably, in the step (1), after removing the excess solution by rolling, the liquid carrying amount of the cotton fabric is controlled to be 95-105 wt%.
Preferably, in the step (1), the temperature of the pre-baking is more than or equal to 25 ℃ and less than 80 ℃, and the time of the pre-baking is 1-5 min.
Preferably, in the step (1), the temperature for heating and curing is 170-190 ℃.
Preferably, in step (1), the time for the heat curing is 30 to 90 s.
Preferably, in the step (1), the weak acidic solution is a sodium citrate solution with a concentration of 20-50 g/L.
Preferably, in step (2), the pH of the direct dye solution is 5-6.4.
Preferably, in the step (2), the temperature of the heating and heat preservation is 90-100 ℃, and the time of the heating and heat preservation is 0.75-1.25 h.
Preferably, the concentration of the chitosan solution is 12g/L, the heating and curing time is 60s, the liquid carrying amount of the cotton fabric after the excess solution is removed by rolling is 100 wt%, and the pH value of the direct dye solution is 6.4.
Preferably, the direct dye is sodium copper chlorophyllin, and the amount of sodium copper chlorophyllin is 1% o.w.f.
According to the method, the citric acid is taken as the cross-linking agent, the chitosan is cross-linked to the cotton fabric, the K/S value of the dyed cotton fabric and the dye uptake of direct dye to the cotton fabric are improved, the cost is low, and the environmental pollution and the harm to human bodies are reduced.
Drawings
FIG. 1 is a flow chart of the chitosan solution treatment of cotton fabric according to the present invention;
FIG. 2 is a flow chart of the dyeing process of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a method for improving the dye uptake of direct dyes on cotton fabrics, which comprises the following steps:
(1) treating cotton fabric with chitosan solution: completely immersing the pretreated cotton fabric in a chitosan solution, then removing the redundant solution by rolling, prebaking, heating for curing, washing in a weak acid solution, and drying;
(2) dyeing: placing the treated cotton fabric obtained in the step (1) in a direct dye solution for stirring, then heating and preserving heat, and then soaping and drying the cotton fabric;
wherein, in the step (1), the preparation method of the chitosan solution comprises the following steps: dissolving chitosan in citric acid solution with concentration of 40-50 g/L;
the concentration of the chitosan solution is 10-15 g/L.
In the method of the invention, a flow chart of treating cotton fabric by chitosan solution is shown in figure 1; the flow chart of the dyeing process is shown in fig. 2.
In the process of the present invention, the cotton fabric may be a conventional choice in the art. In particular embodiments, the cotton fabric may be a single-face plain cotton fabric.
In the method of the present invention, in the step (1), the concentration of the citric acid solution is 40 to 50 g/L. In particular embodiments, the citric acid solution may have a concentration of 40g/L, 45g/L, or 50 g/L.
In the method of the present invention, in the step (1), the concentration of the chitosan is 10 to 15 g/L. Preferably, the concentration of the chitosan solution is 11-13g/L, most preferably 12 g/L.
In the method of the present invention, in step (1), the pretreatment is bleaching and scouring.
In the method of the present invention, in the step (1), there is no particular requirement for equipment for removing the excess solution by rolling, and it may be a routine choice in the art. Preferably, the operation of removing excess solution by rolling is carried out in a padder.
In the method of the present invention, after removing the excess solution by rolling in step (1), the liquid carrying capacity of the cotton fabric is controlled to be 95 to 105% by weight, and most preferably 100% by weight.
In the method of the present invention, in the step (1), the temperature of the prebaking is more than or equal to 25 ℃ and less than 80 ℃. Preferably, the pre-baking temperature is 55-75 ℃.
In the method of the present invention, in the step (1), the pre-baking time is 1 to 5 min. In particular embodiments, the pre-baking time may be 1min, 1.5min, 2min, 2.5min, 3min, 3.5min, 4min, 4.5min, or 5 min.
In the method of the present invention, in the step (1), the temperature for the thermal curing is 170-. In particular embodiments, the temperature of the heat curing may be 170 ℃, 175 ℃, 180 ℃, 185 ℃, or 190 ℃.
In the method of the present invention, in the step (1), the time for the heat curing is 30 to 90 seconds, preferably 30 to 60 seconds. In specific embodiments, the time for the heat curing may be 30s, 35s, 40s, 45s, 50s, 55s, or 60 s. In the most preferred embodiment, the heat curing time is 60 seconds.
In the method of the present invention, in the step (1), the weakly acidic solution is a sodium citrate solution with a concentration of 20-50 g/L. In particular embodiments, the concentration of the sodium citrate solution may be 20g/L, 25g/L, 30g/L, 35g/L, 40g/L, 45g/L, or 50 g/L.
In the method of the present invention, the direct dye may be a direct dye conventionally used in the art. In a specific embodiment, cotton fabric is dyed with sodium copper chlorophyllin dye. Further preferably, the amount of sodium copper chlorophyllin is 0.9-1.6% o.w.f., most preferably 1% o.w.f. When sodium copper chlorophyllin is used as a direct dye for dyeing and the using amount is 1% o.w.f., the dyed cotton fabric has obviously higher K/S value and higher dye uptake.
Further preferably, in the step (2), the pH of the direct dye solution is 5 to 6.4. In a most preferred embodiment, the pH of the direct dye solution is 6.4. When the pH value of the direct dye solution is more than 6.4, the amino group in the chitosan cannot be protonated, the dye uptake of the direct dye to cotton fabrics cannot be improved, and the dye uptake is poor; when the pH value of the direct dye solution is less than 5, a large amount of sodium copper chlorophyllin is precipitated, and dyeing cannot be performed.
In the most preferred embodiment, in order to enable the dyed cotton fabric to have higher K/S value and higher dye uptake, the concentration of the chitosan solution is 12g/L, the heating and curing time is 60S, the carrying liquid amount of the cotton fabric after the excess solution is removed by rolling is 100 wt%, and the pH value of the direct dye solution is 6.4. Further, the direct dye is sodium copper chlorophyllin, and the dosage of the sodium copper chlorophyllin is 1% o.w.f.
In the method, in the step (2), the heating and heat preservation temperature is 90-100 ℃, and the heating and heat preservation time is 0.75-1.25 h. In particular embodiments, the temperature of the heating and holding may be 90 ℃, 95 ℃, or 100 ℃; the heating and heat preservation time can be 0.75h, 1h or 1.25 h.
In one embodiment, the dyeing is performed by: placing the treated cotton fabric obtained in the step (1) in a direct dye solution, stirring for 15min, heating from room temperature to 95 ℃ at the heating rate of 5 ℃/min, keeping the temperature for 1h, then blowing for cooling, cooling to room temperature, taking out the dyed cotton fabric, washing, drying, soaping and drying the dried cotton fabric.
In the method, the soaping refers to washing the dyed cotton fabric with a nonionic detergent.
In the method, the drying refers to heating the cotton fabric at 50 ℃ to remove the moisture contained in the cotton fabric.
According to the method, citric acid is used as a cross-linking agent to cross-link chitosan to cotton fabric, and the cotton fabric treated by the chitosan solution has better affinity to direct dyes under a specific acidic condition, so that the K/S value of the dyed cotton fabric and the dye uptake of the direct dyes to the cotton fabric are improved.
The present invention will be described in detail by way of examples, but the scope of the present invention is not limited thereto.
Example 1
(1) Completely immersing the bleached and boiled cotton fabric in a citric acid solution with a solvent of 40g/L and a chitosan solution with a concentration of 12g/L, then rolling off redundant solution, controlling the liquid carrying capacity of the cotton fabric to be 100 weight percent, carrying out prebaking at the temperature of 70 ℃ for 2min, and then heating and curing at the temperature of 180 ℃ for 60 s;
(2) washing the cotton fabric solidified in the step (1) in a sodium citrate solution with the concentration of 35g/L, and then drying;
(3) placing the treated cotton fabric obtained in the step (2) in a sodium copper chlorophyllin dye solution (the using amount of sodium copper chlorophyllin is 1% o.w.f., and the pH value of the solution is 6.4), stirring for 15min, heating from room temperature to 95 ℃ at the heating rate of 5 ℃/min, keeping the temperature for 1h, blowing air for cooling, cooling to room temperature, taking out the dyed cotton fabric, cleaning, drying, soaping the dried cotton fabric, and drying to obtain a dyed cotton fabric sample A1;
wherein the cotton fabric is a single-sided plain cotton fabric.
Example 2
The procedure was followed as described in example 1, except that in step (1), the chitosan solution had a concentration of 11g/L, resulting in sample A2 of dyed cotton fabric.
Example 3
The procedure was followed as described in example 1, except that in step (1), the liquid loading of the cotton fabric was controlled to 105% by weight, to obtain a sample of dyed cotton fabric A3.
Example 4
Carried out according to the method described in example 1, except that in step (3) the amount of sodium copper chlorophyllin was 1.5% o.w.f., obtaining sample a4 of dyed cotton fabric.
Example 5
The procedure was followed as described in example 1, except that in step (1), the heat curing time was 40s, resulting in sample A5 of dyed cotton fabric.
Example 6
The procedure was followed as described in example 1, except that in step (3), the direct dye solution had a pH of 5, resulting in sample A6 of dyed cotton fabric.
Example 7
(1) Completely immersing the bleached and boiled cotton fabric in a citric acid solution with a solvent of 50g/L and a chitosan solution with a concentration of 12g/L, then rolling off redundant solution, controlling the liquid carrying capacity of the cotton fabric to be 95 weight percent, carrying out prebaking at the temperature of 65 ℃ for 3min, and then heating and curing at the temperature of 175 ℃ for 50 s;
(2) washing the cotton fabric solidified in the step (1) in a sodium citrate solution with the concentration of 40g/L, and then drying;
(3) placing the treated cotton fabric obtained in the step (2) in a sodium copper chlorophyllin dye solution (the using amount of sodium copper chlorophyllin is 1% o.w.f., and the pH value of the solution is 6), stirring for 15min, heating from room temperature to 95 ℃ at the heating rate of 5 ℃/min, keeping the temperature for 0.75h, blowing for cooling, cooling to room temperature, taking out the dyed cotton fabric, cleaning, drying, soaping the dried cotton fabric, and drying to obtain a dyed cotton fabric sample A7;
wherein the cotton fabric is a single-sided plain cotton fabric.
Comparative example 1
The process is carried out as described in example 1, except that in step (3), the pH of the sodium copper chlorophyllin dye solution is 4.5, at which point the sodium copper chlorophyllin dye precipitates substantially completely and the upper layer of the dye liquor is nearly colorless and transparent, and cotton fabric cannot be dyed.
Comparative example 2
Carried out as described in example 1, except that in step (3) the pH of the sodium copper chlorophyllin dye solution was 6.6, giving sample D1, a dyed cotton fabric.
Comparative example 3
The procedure was followed as described in example 1, except that in step (1), the chitosan solution had a concentration of 8g/L, resulting in a dyed cotton fabric sample D2.
Test example 1
The dye solutions used in examples 1 to 7 and comparative examples 2 to 3 were measured for absorbance at a wavelength of 405nm before and after dyeing, and the dyeing rate was calculated according to the following formula, and the results are shown in Table 1.
Wherein, c1Is the absorbance of the dye liquor before dyeing, c0The absorbance of the dye liquor after dyeing is shown.
Test example 2
The K/S values of the stained specimens obtained in examples 1 to 7 and comparative examples 2 to 3 were measured by the method described in GB/T3921.1-5-1997, and the results are shown in Table 1.
TABLE 1
| Numbering | K/S | Direct dye uptake (%) |
| A1 | 11.94 | 96.43 |
| A2 | 10.05 | 88.52 |
| A3 | 11.19 | 89.65 |
| A4 | 9.98 | 88.47 |
| A5 | 10.67 | 91.39 |
| A6 | 8.99 | 83.68 |
| A7 | 9.34 | 90.12 |
| D1 | 5.31 | 47.18 |
| D2 | 7.86 | 73.73 |
The results in Table 1 show that the sample dyed with the method has a large K/S value, and the cotton fabric dyed with the direct dye has a dyeing rate of more than 80%, which indicates that the method can effectively improve the cotton fabric dyeing rate of the direct dye.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A method for improving the dye uptake of direct dyes to cotton fabrics is characterized by comprising the following steps:
(1) treating cotton fabric with chitosan solution: completely immersing the pretreated cotton fabric in a chitosan solution, then removing the redundant solution by rolling, prebaking, heating for curing, washing in a weak acid solution, and drying;
(2) dyeing: placing the treated cotton fabric obtained in the step (1) in a direct dye solution for stirring, then heating and preserving heat, and then soaping and drying the cotton fabric;
wherein, in the step (1), the preparation method of the chitosan solution comprises the following steps: dissolving chitosan in citric acid solution with concentration of 40-50 g/L;
the concentration of the chitosan solution is 10-15 g/L.
2. The method according to claim 1, wherein in step (1), the pretreatment is bleaching and scouring.
3. The method according to claim 1, wherein in the step (1), after removing the excess solution, the liquid carrying capacity of the cotton fabric is controlled to be 95-105 wt%.
4. The method according to claim 1, wherein in the step (1), the temperature of the pre-baking is more than or equal to 25 ℃ and less than 80 ℃, and the time of the pre-baking is 1-5 min.
5. The method as claimed in claim 1, wherein in step (1), the temperature for the thermal curing is 170-190 ℃.
6. The method according to claim 1 or 5, wherein in step (1), the time for the heat curing is 30 to 90 s.
7. The method as claimed in claim 1, wherein in the step (1), the weakly acidic solution is a sodium citrate solution having a concentration of 20-50 g/L.
8. The method according to claim 1, wherein in step (2), the pH of the direct dye solution is 5 to 6.4.
9. The method according to claim 1, wherein in the step (2), the temperature of the heating and heat preservation is 90-100 ℃, and the time of the heating and heat preservation is 0.75-1.25 h.
10. The method according to claim 1, wherein the concentration of the chitosan solution is 12g/L, the time for heating and curing is 60s, the liquid carrying capacity of the cotton fabric after the excess solution is rolled off is 100 wt%, and the pH value of the direct dye solution is 6.4;
preferably, the direct dye is sodium copper chlorophyllin, and the amount of sodium copper chlorophyllin is 1% o.w.f.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115404706A (en) * | 2022-09-01 | 2022-11-29 | 江南大学 | Photodynamic antibacterial and deodorant silkworm excrement fabric and preparation method thereof |
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| JP2006131751A (en) * | 2004-11-05 | 2006-05-25 | Nippon Soda Co Ltd | Liquid composition containing dye having improved light resistance |
| CN102268823A (en) * | 2011-08-12 | 2011-12-07 | 常州大学 | Method for improving dye depth of cellulose fiber fabrics by using chitosan |
| CN106758367A (en) * | 2016-12-15 | 2017-05-31 | 陕西玉航电子有限公司 | A kind of colouring method of sodium copper chlorophyllin |
| CN107044055A (en) * | 2017-04-19 | 2017-08-15 | 武汉纺织大学 | A kind of method of the few water dyed cotton fabric of cochineal red pigment |
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2020
- 2020-08-14 CN CN202010816760.5A patent/CN111851097A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006131751A (en) * | 2004-11-05 | 2006-05-25 | Nippon Soda Co Ltd | Liquid composition containing dye having improved light resistance |
| CN102268823A (en) * | 2011-08-12 | 2011-12-07 | 常州大学 | Method for improving dye depth of cellulose fiber fabrics by using chitosan |
| CN106758367A (en) * | 2016-12-15 | 2017-05-31 | 陕西玉航电子有限公司 | A kind of colouring method of sodium copper chlorophyllin |
| CN107044055A (en) * | 2017-04-19 | 2017-08-15 | 武汉纺织大学 | A kind of method of the few water dyed cotton fabric of cochineal red pigment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115404706A (en) * | 2022-09-01 | 2022-11-29 | 江南大学 | Photodynamic antibacterial and deodorant silkworm excrement fabric and preparation method thereof |
| CN115404706B (en) * | 2022-09-01 | 2023-09-15 | 江南大学 | Photodynamic antibacterial deodorizing silkworm excrement fabric and preparation method thereof |
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