CN110578259B - Method for improving dyeing depth of natural dye of silk fabric - Google Patents
Method for improving dyeing depth of natural dye of silk fabric Download PDFInfo
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- CN110578259B CN110578259B CN201910875217.XA CN201910875217A CN110578259B CN 110578259 B CN110578259 B CN 110578259B CN 201910875217 A CN201910875217 A CN 201910875217A CN 110578259 B CN110578259 B CN 110578259B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/0666—Polycondensates containing five-membered rings, condensed with other rings, with nitrogen atoms as the only ring hetero atoms
- C08G73/0672—Polycondensates containing five-membered rings, condensed with other rings, with nitrogen atoms as the only ring hetero atoms with only one nitrogen atom in the ring
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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
- D06P1/34—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 natural dyestuffs
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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
- D06P1/52—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 synthetic macromolecular substances
- D06P1/5264—Macromolecular compounds obtained otherwise than by reactions involving only unsaturated carbon-to-carbon bonds
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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
- D06P3/02—Material containing basic nitrogen
- D06P3/04—Material containing basic nitrogen containing amide groups
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- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
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Abstract
The invention provides a method for improving the dyeing depth of natural dye of silk fabric, which comprises the steps of firstly pretreating the silk fabric by adopting low-temperature plasma, then soaking in dopamine hydrochloride solution, wherein the low-temperature plasma pretreatment is favorable for permeation of the dopamine hydrochloride and the natural dye to the fabric; then initiating the polymerization of dopamine hydrochloride adsorbed on the fabric by ultraviolet irradiation to form a polydopamine film on the surface of the silk fabric. In the dyeing process of the natural dye, the protonized amino and imino groups on the molecular structure of the polydopamine can ensure that silk fabrics of the polydopamine are positively charged, thereby being beneficial to improving the dyeing depth and the color fastness of the natural dye and avoiding the use of a metal ion mordant.
Description
Technical Field
The invention belongs to the field of spinning, and particularly relates to a method for improving the dyeing depth of a natural dye of a silk fabric.
Background
The natural dye is used for dyeing the fabric in the traditional way since ancient times in China, the natural dye dyed fabric is soft in color and luster, and a lot of natural dyes also have the effects of ultraviolet resistance, antibiosis and health care and are well popular with people. Most of natural dyes mainly comprise water-soluble micromolecular compounds such as carotenoid, flavonoid, anthocyanin, chlorophyll and the like, so that the natural dye dyed fabric has low dye-uptake, light color and poor dyeing fastness. Although the color depth and the color fastness of the natural dye dyed fabric can be improved by selecting the proper metal ion mordant, a plurality of metal ions have potential threats to human health and are limited in use.
Scientists find that polydopamine has the performance similar to mussel adhesive protein, and can quickly form a layer of polydopamine film with tens of nanometers on the surfaces of various materials. The molecular structure of the polydopamine contains a large number of hydroxyl groups and imino groups, and when the pH value of a solution is lower than 4, the amino groups and the imino groups on the molecular structure of the polydopamine are protonated to make the polydopamine have positive charges. Therefore, polydopamine can be treated on the surface of the textile, and the color depth and the color fastness of the anionic natural dye on the textile are improved. Generally, dopamine monomers can be polymerized under the condition of keeping out of the light, aerobic and alkaline (pH is more than 7.5), but the polymerization speed is very slow (more than 24 h); and the color of the polydopamine changes from brown to black along with the increase of the polymerization degree, which limits the application of the polydopamine in the aspect of textile dyeing.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for improving the dyeing depth of natural dye of silk fabric, and the method can obviously improve the color depth and the washing fastness of the natural dye dyed silk fabric.
The technical scheme for realizing the purpose is as follows: firstly, pretreating silk fabrics by adopting low-temperature plasma, then soaking in dopamine solution, rinsing with distilled water, and polymerizing by ultraviolet irradiation; and then dyeing the treated silk fabric by using natural dye.
The invention provides a method for improving the dyeing depth of natural dye of silk fabric, which comprises the following steps:
(1) placing silk fabric on a frame in a DT-01 low-temperature plasma processing instrument cavity produced by Oppus plasma science and technology Limited, Suzhou, starting a vacuum pump, introducing nitrogen when the vacuum degree in the reaction cavity is 5Pa, and adjusting the gas flow until the vacuum degree in the reaction cavity is 30-40 Pa; stabilizing for 3-5min, then performing glow discharge with the discharge power of 50-150W and the discharge time of 5-10min, and after the discharge is finished, taking out the fabric and immediately entering the next operation;
(2) immersing the silk fabric treated in the step (1) into 50-100mL of dopamine buffer solution, stirring for 1-2h at 25 ℃, then taking out the silk fabric, and rinsing for 3-5 times by using distilled water for later use;
(3) sealing silk fabrics treated by the dopamine buffer solution in a quartz reactor filled with oxygen, turning on an ultraviolet light source to carry out ultraviolet irradiation, rinsing with distilled water for 3-5 times after the irradiation is finished, and drying in vacuum at 50-60 ℃ for later use;
(4) and (3) dyeing the silk fabric treated in the step (3) by using natural dye, wherein the using amount of the natural dye is 0.5-5% (o.w.f), the bath ratio is 1:8-15, the pH value of a dyeing bath is adjusted to 3.5 by using glacial acetic acid, the dyeing temperature is 50-80 ℃, the dyeing time is 30-45min, and after dyeing is finished, the fabric is washed by water for 3-5 times and is naturally dried.
The dopamine buffer solution in the step (2) is prepared from dopamine hydrochloride, sodium acetate and acetic acid solution, and the solution is used as it is; wherein the concentration of the dopamine hydrochloride is 0.5-1.0 g/L, and the pH value of the dopamine buffer solution is adjusted to 3-6 by adopting 0.2mol/L sodium acetate and 0.3mol/L acetic acid solution.
The ultraviolet irradiation conditions in the step (3) are that the wavelength of ultraviolet light is 260nm, the power is 7.5W, and the ultraviolet irradiation time is 5-10 min.
The natural dye in the step (4) is one of turmeric, gardenia yellow, pomegranate rind, chestnut shell, gordon euryale seed shell, mulberry, lithospermum, lotus leaf, scutellaria baicalensis, sophora flower, safflower, sappan wood, golden cypress, coptis chinensis, Chinese gall, tea and the like.
According to the technical scheme, the method comprises the following steps: the invention firstly adopts low-temperature plasma to carry out surface treatment on silk fabrics, which is beneficial to the permeation of dopamine hydrochloride and natural dye to the fabrics; ultraviolet light is adopted to initiate polymerization of dopamine on the fabric, the operation is simple, and the reaction is easy to control.
The invention has the beneficial effects that:
(1) the polymerization of dopamine on the fabric is initiated by adopting ultraviolet radiation, the reaction speed is high, and the operation is simple.
(2) The cationic properties of protonated amino and imino on the molecular structure of the polydopamine are utilized to improve the dyeing depth and fastness of the natural dye, and the method is ecological and environment-friendly.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It will be understood that these examples are intended to illustrate the invention and are not intended to limit the scope of the invention in any way.
Example 1
(1) Placing the silk fabric on a frame in a DT-01 low-temperature plasma processing instrument cavity produced by Oppus plasma science and technology Limited, Suzhou, starting a vacuum pump, introducing nitrogen when the vacuum degree in the reaction cavity is 5Pa, and adjusting the gas flow until the vacuum degree in the reaction cavity is 30 Pa; stabilizing for 3min, then performing glow discharge with the discharge power of 50W for 10min, and after the discharge is finished, taking out the fabric and immediately entering the next operation;
(2) immersing the silk fabric treated in the step (1) into 50mL of dopamine buffer solution, wherein the concentration of dopamine hydrochloride is 0.5 g/L, adjusting the pH value of the dopamine buffer solution to 3 by adopting 0.2mol/L sodium acetate and 0.3mol/L acetic acid solution, stirring for 1h at 25 ℃, then taking out the silk fabric, and rinsing for 3 times by using distilled water for later use;
(3) sealing silk fabrics treated by the dopamine buffer solution in a quartz reactor filled with oxygen, turning on an ultraviolet light source to carry out ultraviolet irradiation, wherein the wavelength of ultraviolet light is 260nm, the power is 7.5W, the ultraviolet irradiation time is 5min, rinsing with distilled water for 3 times after the irradiation is finished, and carrying out vacuum drying at 50 ℃ for later use;
(4) and (3) dyeing the silk fabric treated in the step (3) by using turmeric natural dye, wherein the using amount of turmeric is 0.5% (o.w.f), the bath ratio is 1:8, the pH value of the dyeing bath is adjusted to 3.5 by using glacial acetic acid, the dyeing temperature is 50 ℃, the dyeing time is 45min, and after dyeing is finished, the fabric is washed by water for 3 times and is naturally dried.
Comparative example 1-1 (without Low temperature plasma treatment)
(1) Immersing silk fabrics in 50mL of dopamine buffer solution, wherein the concentration of dopamine hydrochloride is 0.5 g/L, adjusting the pH value of the dopamine buffer solution to 3 by adopting 0.2mol/L sodium acetate and 0.3mol/L acetic acid solution, stirring for 1h at 25 ℃, then taking out the silk fabrics, and rinsing for 3 times by using distilled water for later use;
(2) sealing silk fabrics treated by the dopamine buffer solution in a quartz reactor filled with oxygen, turning on an ultraviolet light source to carry out ultraviolet irradiation, wherein the wavelength of ultraviolet light is 260nm, the power is 7.5W, the ultraviolet irradiation time is 5min, rinsing with distilled water for 3 times after the irradiation is finished, and carrying out vacuum drying at 50 ℃ for later use;
(3) and (3) dyeing the silk fabric treated in the step (2) by using turmeric natural dye, wherein the using amount of turmeric is 0.5% (o.w.f), the bath ratio is 1:8, the pH value of a dyeing bath is adjusted to 3.5 by using glacial acetic acid, the dyeing temperature is 50 ℃, the dyeing time is 45min, and after dyeing is finished, the fabric is washed by water for 3 times and is naturally dried.
Comparative examples 1-2 (without polydopamine treatment)
(1) Placing the silk fabric on a frame in a DT-01 low-temperature plasma processing instrument cavity produced by Oppus plasma science and technology Limited, Suzhou, starting a vacuum pump, introducing nitrogen when the vacuum degree in the reaction cavity is 5Pa, and adjusting the gas flow until the vacuum degree in the reaction cavity is 30 Pa; stabilizing for 3min, then performing glow discharge with the discharge power of 50W for 10min, and after the discharge is finished, taking out the fabric and immediately entering the next operation;
(2) and (2) dyeing the silk fabric treated in the step (1) by using turmeric natural dye, wherein the using amount of turmeric is 0.5% (o.w.f), the bath ratio is 1:8, the pH value of a dyeing bath is adjusted to 3.5 by using glacial acetic acid, the dyeing temperature is 50 ℃, the dyeing time is 45min, and after dyeing is finished, the fabric is washed by water for 3 times and is naturally dried.
Comparative examples 1 to 3 (polymerization by ultraviolet irradiation without oxygen)
(1) Placing the silk fabric on a frame in a DT-01 low-temperature plasma processing instrument cavity produced by Oppus plasma science and technology Limited, Suzhou, starting a vacuum pump, introducing nitrogen when the vacuum degree in the reaction cavity is 5Pa, and adjusting the gas flow until the vacuum degree in the reaction cavity is 30 Pa; stabilizing for 3min, then performing glow discharge with the discharge power of 50W for 10min, and after the discharge is finished, taking out the fabric and immediately entering the next operation;
(2) immersing the silk fabric treated in the step (1) into 50mL of dopamine buffer solution, wherein the concentration of dopamine hydrochloride is 0.5 g/L, adjusting the pH value of the dopamine buffer solution to 3 by adopting 0.2mol/L sodium acetate and 0.3mol/L acetic acid solution, stirring for 1h at 25 ℃, then taking out the silk fabric, and rinsing for 3 times by using distilled water for later use;
(3) sealing silk fabrics treated by the dopamine buffer solution in a quartz reactor filled with argon, turning on an ultraviolet light source to perform ultraviolet irradiation, wherein the wavelength of ultraviolet light is 260nm, the power is 7.5W, the ultraviolet irradiation time is 5min, rinsing with distilled water for 3 times after the irradiation is finished, and performing vacuum drying at 50 ℃ for later use;
(4) and (3) dyeing the silk fabric treated in the step (3) by using turmeric natural dye, wherein the using amount of turmeric is 0.5% (o.w.f), the bath ratio is 1:8, the pH value of the dyeing bath is adjusted to 3.5 by using glacial acetic acid, the dyeing temperature is 50 ℃, the dyeing time is 45min, and after dyeing is finished, the fabric is washed by water for 3 times and is naturally dried.
Comparative examples 1 to 4 (direct dyeing of untreated silk fabrics)
Dyeing silk fabric with turmeric natural dye in the amount of 0.5% (o.w.f) at 1:8, adjusting the pH value of the dyeing bath to 3.5 with glacial acetic acid, dyeing at 50 ℃ for 45min, washing the fabric with water for 3 times after dyeing, and naturally drying to obtain the silk fabric.
Example 2
(1) Placing the silk fabric on a frame in a DT-01 low-temperature plasma processing instrument cavity produced by Oppus plasma science and technology Limited, Suzhou, starting a vacuum pump, introducing nitrogen when the vacuum degree in the reaction cavity is 5Pa, and adjusting the gas flow until the vacuum degree in the reaction cavity is 40 Pa; after 5min of stabilization, glow discharge is carried out, the discharge power is 150W, the discharge time is 5min, and after the discharge is finished, the fabric is taken out and immediately enters the next operation;
(2) immersing the silk fabric treated in the step (1) into 100mL of dopamine buffer solution, wherein the concentration of dopamine hydrochloride is 1.0 g/L, adjusting the pH value of the dopamine buffer solution to 6 by adopting 0.2mol/L sodium acetate and 0.3mol/L acetic acid solution, stirring for 2h at 25 ℃, then taking out the silk fabric, and rinsing for 5 times by using distilled water for later use;
(3) sealing silk fabrics treated by the dopamine buffer solution in a quartz reactor filled with oxygen, turning on an ultraviolet light source to carry out ultraviolet irradiation, wherein the wavelength of ultraviolet light is 260nm, the power is 7.5W, the ultraviolet irradiation time is 10min, rinsing with distilled water for 5 times after the irradiation is finished, and carrying out vacuum drying at 60 ℃ for later use;
(4) and (3) dyeing the silk fabric treated in the step (3) by using gardenia yellow natural dye, wherein the using amount of the gardenia yellow natural dye is 5% (o.w.f), the bath ratio is 1:15, the pH value of a dyeing bath is adjusted to 3.5 by using glacial acetic acid, the dyeing temperature is 80 ℃, the dyeing time is 30min, and after dyeing is finished, the fabric is washed by water for 5 times and naturally aired.
Comparative example 2
Dyeing silk fabric by using gardenia yellow natural dye, wherein the using amount of the gardenia yellow natural dye is 5% (o.w.f), the bath ratio is 1:15, the pH value of the dyeing bath is adjusted to 3.5 by using glacial acetic acid, the dyeing temperature is 80 ℃, the dyeing time is 30min, and after dyeing is finished, the fabric is washed by water for 5 times and naturally dried to obtain the silk fabric.
Example 3
(1) Placing the silk fabric on a frame in a DT-01 low-temperature plasma processing instrument cavity produced by Oppus plasma science and technology Limited, Suzhou, starting a vacuum pump, introducing nitrogen when the vacuum degree in the reaction cavity is 5Pa, and adjusting the gas flow until the vacuum degree in the reaction cavity is 35 Pa; after 4min of stabilization, glow discharge is carried out, the discharge power is 100W, the discharge time is 8min, and after the discharge is finished, the fabric is taken out and immediately enters the next operation;
(2) immersing the silk fabric treated in the step (1) into 80mL of dopamine buffer solution, wherein the concentration of dopamine hydrochloride is 0.8 g/L, adjusting the pH value of the dopamine buffer solution to 4 by adopting 0.2mol/L sodium acetate and 0.3mol/L acetic acid solution, stirring for 1.5h at 25 ℃, then taking out the silk fabric, and rinsing for 4 times by using distilled water for later use;
(3) sealing silk fabrics treated by the dopamine buffer solution in a quartz reactor filled with oxygen, turning on an ultraviolet light source to carry out ultraviolet irradiation, wherein the wavelength of ultraviolet light is 260nm, the power is 7.5W, the ultraviolet irradiation time is 8min, rinsing with distilled water for 4 times after the irradiation is finished, and carrying out vacuum drying at 55 ℃ for later use;
(4) and (3) dyeing the silk fabric treated in the step (3) by adopting a sappan wood natural dye, wherein the consumption of the sappan wood natural dye is 1% (o.w.f), the bath ratio is 1:10, the pH value of a dyeing bath is adjusted to 3.5 by using glacial acetic acid, the dyeing temperature is 60 ℃, the dyeing time is 35min, and after the dyeing is finished, the fabric is washed by water for 4 times and naturally aired.
Comparative example 3
Dyeing silk fabric by adopting sappan wood natural dye, wherein the consumption of the sappan wood natural dye is 1% (o.w.f), the bath ratio is 1:10, the pH value of the dyeing bath is adjusted to 3.5 by using glacial acetic acid, the dyeing temperature is 60 ℃, the dyeing time is 35min, and after dyeing is finished, the fabric is washed by water for 4 times and naturally aired to obtain the silk fabric.
Example 4
(1) Placing the silk fabric on a frame in a DT-01 low-temperature plasma processing instrument cavity produced by Oppus plasma science and technology Limited, Suzhou, starting a vacuum pump, introducing nitrogen when the vacuum degree in the reaction cavity is 5Pa, and adjusting the gas flow until the vacuum degree in the reaction cavity is 38 Pa; after 3.5min of stabilization, glow discharge is carried out, the discharge power is 80W, the discharge time is 6min, and after the discharge is finished, the fabric is taken out and immediately enters the next operation;
(2) immersing the silk fabric treated in the step (1) into 60mL of dopamine buffer solution, wherein the concentration of dopamine hydrochloride is 0.6 g/L, adjusting the pH value of the dopamine buffer solution to 5 by adopting 0.2mol/L sodium acetate and 0.3mol/L acetic acid solution, stirring for 1.2h at 25 ℃, then taking out the silk fabric, and rinsing for 3 times by using distilled water for later use;
(3) sealing silk fabrics treated by the dopamine buffer solution in a quartz reactor filled with oxygen, turning on an ultraviolet light source to carry out ultraviolet irradiation, wherein the wavelength of ultraviolet light is 260nm, the power is 7.5W, the ultraviolet irradiation time is 6min, rinsing with distilled water for 3 times after the irradiation is finished, and carrying out vacuum drying at 58 ℃ for later use;
(4) and (3) dyeing the silk fabric treated in the step (3) by adopting a safflower natural dye, wherein the using amount of the safflower natural dye is 2% (o.w.f), the bath ratio is 1:12, the pH value of a dyeing bath is adjusted to 3.5 by using glacial acetic acid, the dyeing temperature is 70 ℃, the dyeing time is 40min, and after dyeing is finished, the fabric is washed by water for 3 times and naturally aired.
Comparative example 4
Dyeing silk fabric by using natural safflower dye, wherein the using amount of the natural safflower dye is 2% (o.w.f), the bath ratio is 1:12, the pH value of the dyeing bath is adjusted to 3.5 by using glacial acetic acid, the dyeing temperature is 70 ℃, the dyeing time is 40min, and after dyeing is finished, the fabric is washed by water for 3 times and naturally aired.
Example 5
Measurement of color depth (K/S value): the dyed fabric was folded twice (four layers), and the K/S value of the dyed fabric was measured at λ max using a Datacolor SF600X computer colorimeter, with an average of four measurements per sample.
Determination of color fastness: the color fastness to rubbing is determined according to the method specified in GB/T3920-; the color fastness to washing is determined according to the method GB/T3921-2008 'color fastness to washing in the textile color fastness test'.
TABLE 1K/S values and color fastnesses of the dyed fabrics
As can be seen from the above table, compared with the traditional direct dyeing method (comparative examples 1-4, comparative examples 2, 3 and 4), the silk fabric obtained by adopting the dyeing method of the invention has obviously deepened color (the K/S value is larger), good friction fastness and soaping fastness, and the K/S value and color fastness change of the dyed fabric are smaller after 20 times of washing; and after the fabric obtained by the traditional dyeing method is washed for 20 times, the color depth and the color fastness of the fabric are obviously reduced. In comparative examples 1-2, the silk fabric was not treated with polydopamine, and the dyed fabric was significantly poor in color depth and color fastness. In comparative examples 1-3, the amount of polydopamine attached to the fabric was small and the dyed fabric was slightly darker in color due to the absence of oxygen during polymerization of dopamine by ultraviolet irradiation. In addition, the low-temperature plasma pretreatment is also beneficial to the improvement of the K/S value of the fabric.
Claims (2)
1. A method for improving the dyeing depth of natural dye of silk fabric is characterized in that: the method comprises the following steps of,
firstly, pretreating silk fabrics by adopting low-temperature plasma, then soaking in dopamine hydrochloride solution, rinsing with distilled water, and carrying out ultraviolet irradiation polymerization; then, dyeing the treated silk fabric by using natural dye; the method comprises the specific steps of carrying out the following steps,
(1) placing the silk fabric on a frame in a cavity of a low-temperature plasma treatment instrument, starting a vacuum pump, introducing nitrogen when the vacuum degree in the reaction cavity is 5Pa, and adjusting the gas flow until the vacuum degree in the reaction cavity is 30-40 Pa; stabilizing for 3-5min, then performing glow discharge with the discharge power of 50-150W and the discharge time of 5-10min, and after the discharge is finished, taking out the fabric and immediately entering the next operation;
(2) immersing the silk fabric treated in the step (1) into 50-100mL of dopamine buffer solution, stirring for 1-2h at 25 ℃, then taking out the silk fabric, and rinsing for 3-5 times by using distilled water for later use; wherein the dopamine buffer solution is prepared from dopamine hydrochloride, sodium acetate and acetic acid solution, and the solution is prepared for use; the concentration of the dopamine hydrochloride is 0.5-1.0 g/L, and the pH value of the dopamine buffer solution is adjusted to 3-6 by adopting 0.2mol/L sodium acetate and 0.3mol/L acetic acid solution;
(3) sealing the silk fabric treated by the dopamine buffer solution in a quartz reactor filled with oxygen, and turning on an ultraviolet light source to carry out ultraviolet irradiation under the conditions that the wavelength of ultraviolet light is 260nm, the power is 7.5W and the ultraviolet irradiation time is 5-10 min; after the irradiation is finished, rinsing the film for 3 to 5 times by using distilled water, and then drying the film in vacuum at 50 to 60 ℃ for later use;
(4) and (3) dyeing the silk fabric treated in the step (3) by using natural dye, wherein the using amount of the natural dye is 0.5-5% (o.w.f), the bath ratio is 1:8-15, the pH value of a dyeing bath is adjusted to 3.5 by using glacial acetic acid, the dyeing temperature is 50-80 ℃, the dyeing time is 30-45min, and after dyeing is finished, the fabric is washed by water for 3-5 times and is naturally dried.
2. The method of claim 1, wherein the step of increasing the dye depth of the natural dye of the silk fabric comprises: the natural dye in the step (4) is one of turmeric, gardenia yellow, pomegranate rind, chestnut shell, gordon euryale seed shell, mulberry, lithospermum, lotus leaf, scutellaria baicalensis, sophora flower, safflower, sappan wood, golden cypress, coptis chinensis, gallnut and tea.
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