CN113981713B - Method for dyeing real silk fabric by adopting natural dye - Google Patents

Method for dyeing real silk fabric by adopting natural dye Download PDF

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CN113981713B
CN113981713B CN202111265032.0A CN202111265032A CN113981713B CN 113981713 B CN113981713 B CN 113981713B CN 202111265032 A CN202111265032 A CN 202111265032A CN 113981713 B CN113981713 B CN 113981713B
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natural
dyeing
real silk
dye
silk fabric
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CN113981713A (en
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陶尧定
高尚
黄健夫
王潮霞
费良
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High Fashion China Co ltd
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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
    • 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
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
    • D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
    • D06M13/11—Compounds containing epoxy groups or precursors thereof
    • 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
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
    • D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
    • D06M13/224—Esters of carboxylic acids; Esters of carbonic acid
    • D06M13/2246—Esters of unsaturated carboxylic acids
    • 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
    • D06M23/00—Treatment of fibres, threads, yarns, fabrics or fibrous goods made from such materials, characterised by the process
    • D06M23/12—Processes in which the treating agent is incorporated in microcapsules
    • 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
    • D06P1/36—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 mordant dyes ; using metallisable dyes
    • 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
    • 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
    • D06P3/046—Material containing basic nitrogen containing amide groups using metallisable or mordant dyes
    • 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
    • D06M2101/10—Animal fibres

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Coloring (AREA)

Abstract

The invention relates to the field of fabric dyeing, and provides a method for dyeing real silk fabric by adopting natural dye, aiming at the problem of low fastness when the natural dye is used for dyeing the fabric; (2) blending the natural antioxidant and the Arabic gum, adding an emulsifying agent for dispersion and emulsification, and reacting to obtain a natural antioxidant microcapsule; (3) and (3) placing the natural dye-dyed silk fabric into a natural antioxidant microcapsule solution, maintaining a stable liquid carrying rate through rolling, and finally drying. According to the invention, the natural antioxidant is added when the natural dye is used for dyeing the fabric, so that the light fastness is further improved while mordant dyeing is carried out; and the natural shell material is used for microencapsulating the natural antioxidant, so that the durability of the natural antioxidant is improved.

Description

Method for dyeing real silk fabric by adopting natural dye
Technical Field
The invention relates to the field of fabric dyeing, in particular to a method for dyeing real silk fabrics by adopting natural dyes.
Background
Natural dyes are dyes obtained from plant, animal or mineral sources that are not artificially synthesized, and that have little or no chemical processing. The natural dye has fragrant smell and soft color tone, and many dyes have sterilizing effect, and the materials are natural, finally return to the natural, so that the environment is protected, and the ecological cycle rule is met. Many natural dyes have excellent properties such as non-toxicity, innocuity, no pollution to the environment, antibiosis, moth-proofing, convenient use, and easy preservation. Since synthetic dyes have been introduced into the market, some disadvantages of vegetable dyes have become increasingly apparent, such as complex dyeing processes, incomplete chromatography, poor color fastness, etc. Therefore, the advantages of safety and no pollution of the natural dye are utilized to the greatest extent, and the development of the environment-friendly processing and extracting technology with high efficiency, low toxicity and low environmental influence is significant for realizing sustainable management of natural resources.
The natural dye pigment has low affinity with fabric fibers, pigment molecules contained in the extracted dye are less, and stronger van der Waals force can not be formed between the extracted dye and the fibers, so that the fastness of the natural dye is much lower than that of the synthetic dye for dyeing the fabric. For example, patent CN107869070a discloses a production method for improving the dyeing fastness of pure natural dye, which belongs to the textile field and comprises the following steps: s1, selecting colored raw materials; s2, collocating raw materials; s3, preparing pure natural dye dyeing liquid; s4, dyeing; s5, pre-drying; s6, washing with water; s7, drying; s8, after-treatment; the beneficial effects are that: the method is novel and ingenious, has strong technical continuity, high production efficiency and low-carbon and environment-friendly production process, and the product produced by the method is purely natural, environment-friendly and healthy, is an ecological product which is very needed in the market but cannot be supplied in a large scale, and has good market prospect. However, one or more of the selected colored raw materials must be natural dyes with high viscosity, such as wild fruit, yam, eichhornia and jackfruit, and the raw materials are extremely limited, so that an ideal solution is needed.
Disclosure of Invention
In order to overcome the problem of low fastness of natural dye to fabric, the invention provides a method for dyeing real silk fabric by adopting natural dye, wherein natural antioxidant is added when the natural dye is used for dyeing the fabric, and the light fastness is further improved while mordant dyeing is carried out; and the natural shell material is used for microencapsulating the natural antioxidant, so that the durability of the natural antioxidant is improved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for dyeing real silk fabrics by adopting natural dyes, comprising the following steps:
(1) Dyeing natural dye silk: soaking the real silk fabric in natural dye for dyeing, and then mordant dyeing the real silk fabric by using a natural mordant to obtain the natural dye dyed real silk fabric;
(2) Microencapsulation of natural antioxidants: blending the natural antioxidant and the Arabic gum, adding an emulsifying agent for dispersion and emulsification, and reacting to obtain a natural antioxidant microcapsule;
(3) And (3) placing the natural dye dyed real silk fabric obtained in the step (1) into the natural antioxidant microcapsule solution obtained in the step (2), keeping a stable liquid carrying rate through rolling and pressing, and finally drying.
After dyeing is carried out, the fiber material is subjected to mordant dyeing treatment, and the mordant dyeing material is combined with pigment entering the amorphous field, so that the fiber material is extruded between the fiber and the pigment to generate tone change and enhance the light fastness, that is, the color fixation effect of tone change and enhancing the washing fastness and the light fastness is generated through the ion coordination combination of pigment molecules and mordant.
Natural antioxidants, as natural substances, have less environmental impact and are capable of capturing free radicals generated by photoinitiation, interfering with or terminating the proliferation step in the chain reaction, thereby increasing the light fastness of natural dyes dyed real silk fabrics. However, the natural antioxidants are easily oxidized in the air, so that the natural antioxidants are microencapsulated, and the antioxidation durability of the natural antioxidants on natural dye-dyed silk fabrics is improved.
Preferably, the natural dye in the step (1) is one or more of anthraquinone, tannin, flavonoid, chlorophyll, carotenoid and curcumin.
Preferably, the dyeing conditions in step (1) are: the temperature is 30-100 ℃; bath ratio 1 (5-100); the pH value is 2-8.
Preferably, the natural mordant in the step (1) is one of alum, lime water and ash water.
Preferably, the natural antioxidant in the step (2) is one or more of anti-sepsis acid, propyl gallate, licoisoflavone and tea polyphenol. As a further preference, the mass ratio of the natural antioxidant to the gum arabic of step (2) is 1 (0.5-10). As a further preference, the pH of the reaction in step (2) is from 2 to 7.
Preferably, the rolling surplus rate of the rolling in the step (3) is 60% -110%.
Preferably, the temperature of the drying in the step (3) is 30-130 ℃.
Preferably, the preparation method of the natural antioxidant microencapsulation in the step (2) comprises the following steps: dissolving N-isopropyl acrylamide and N-butyl acrylate in water, adding a natural antioxidant, arabic gum and an emulsifier, uniformly stirring, adding ammonium persulfate and suberic acid diimine succinate, and reacting at 70-80 ℃ for 3-5h to obtain the natural antioxidant microcapsule.
According to the invention, the temperature-sensitive substance N-isopropyl acrylamide is introduced into the Arabic gum molecular chain, so that the microcapsule has temperature sensitivity, and the coating and release of the natural antioxidant are conveniently realized through the external temperature regulation and control. The specific method comprises the following steps: the polymerization monomer N-isopropyl acrylamide and N-butyl acrylate are mixed with common Arabic gum, and the three are linked under the action of an initiator ammonium sulfate and a crosslinking agent suberic acid diimine succinate to form hydrogel. In the hydrogel forming process, the natural antioxidants dispersed in the reaction liquid can be naturally coated in the hydrosol, namely the natural antioxidant microcapsules are formed, and the anti-oxidation protection effect on the natural antioxidants is achieved. When the natural antioxidants are required to be released, the natural antioxidants are heated to the critical transition temperature and above, the temperature-sensitive hydrogel can rapidly respond, shrink and discharge water molecules in the body, and the natural antioxidants are discharged along with water to act with the silk fabrics.
The advantages of using the temperature sensitive hydrogel coating described above over the direct use of an arabino hydrogel are: (1) the temperature sensitive hydrogel can be recycled, so that resources are saved; (2) the N-isopropyl acrylamide has hydrophilic amide groups and hydrophobic isopropyl groups in the molecule, and has antistatic and softening effects on silk fabrics;(3) silk fabrics, such as fibroin fibers, are enriched with many amino groups (-CHNH) and amino groups (-NH) 2 ) The hydrophilic groups, namely hydrophilic amide groups in the N-isopropyl acrylamide molecules, can help the microcapsules to be extruded between fibers, and enhance the suction fastness of the natural antioxidant.
Preferably, the molar ratio of the N-isopropyl acrylamide to the N-butyl acrylate is 25 (2-3), and the mass of the natural antioxidant, the Arabic gum, the ammonium persulfate and the succinic acid suberic acid diimine are 3-6%, 3-12%, 1-3% and 0.2-0.5% of the sum of the mass of the N-isopropyl acrylamide and the N-butyl acrylate respectively; the temperature of the padding liquid of the rolling in the step (3) is 25-30 ℃.
From the action mechanism of the temperature-sensitive hydrogel, the control of the critical transition temperature has important significance for practical production. When pure N-isopropyl acrylamide is used, the critical transition temperature is about 33 ℃. However, when the real silk fabric is rolled, the temperature of the padding liquid can be properly increased, but the temperature of the padding liquid is too high, the temperature of the cloth roll is increased, the hydrolysis rate of the dye which is dyed originally is obviously increased, and the fixation rate is obviously reduced, so that in order to balance the dye coloring rate and the natural antioxidant adsorption rate, a great amount of experiments are carried out, and the critical transition temperature of the hydrogel is adjusted to 25-28 ℃. When the temperature of the padding liquid is in the range, the temperature is easy to control, the adsorption rate of the natural antioxidant to the silk fabric is more than 90%, and the dye hydrolysis rate is not high. The critical transition temperature is controlled by the proportion of N-isopropyl acrylamide and N-butyl acrylate, and the original critical transition temperature of the N-isopropyl acrylamide can be reduced by adding hydrophobic N-butyl acrylate.
Therefore, the invention has the beneficial effects that: (1) Natural dyes with different structures can be selected to dye the real silk fabric, so that a rich color system is constructed; (2) Analyzing natural dyes with different structures by a mordant dyeing method to obtain optimal color and fastness; (3) Adding natural antioxidant, and further improving the light fastness while mordant dyeing; (4) The natural shell material is used for microencapsulating the natural antioxidant, so that the durability of the natural antioxidant is improved.
Drawings
FIG. 1 is a K/S curve of a natural dye dyed silk fabric of example 1 at different temperatures;
FIG. 2 is a K/S curve of a natural dye dyed real silk fabric of example 4 with different mordant contents.
Detailed Description
The technical scheme of the invention is further described through specific embodiments.
In the present invention, unless otherwise specified, the materials and equipment used are commercially available or are commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
Example 1
A method for dyeing real silk fabric by adopting natural dye comprises the following specific steps:
(1) Dyeing natural dye silk: firstly, immersing the silk fabric into alizarin natural dye (anthraquinone) for dyeing, wherein the dyeing conditions are bath ratio of 1:50 and pH=4, and then carrying out mordant dyeing by using ashes water to obtain natural dye-dyed silk fabric; FIG. 1 is a K/S curve of a natural dye-dyed real silk fabric dyed at three different temperatures of 70 ℃, 80 ℃ and 95 ℃ respectively.
(2) Microencapsulation of natural antioxidants: blending licorice isoflavone and acacia in a mass ratio of 1:2, adding sodium dodecyl benzene sulfonate for dispersion and emulsification, and reacting at 40 ℃ and pH=4 to obtain the natural antioxidant microcapsule.
(3) And (3) placing the natural dye dyed real silk fabric prepared in the step (1) into the natural antioxidant microcapsule dispersion liquid prepared in the step (2) with the mass fraction of 10%, then maintaining the liquid carrying rate of 100% through rolling, and finally drying the real silk fabric at 30 ℃.
Example 2
A method for dyeing real silk fabric by adopting natural dye comprises the following specific steps:
(1) Dyeing natural dye silk: the silk fabric is firstly soaked in Chinese gall to extract natural dye (tannins) for dyeing, the dyeing condition is 100 ℃, the bath ratio is 1:100, the pH=8, and then the mordant dyeing is carried out by lime water, so that the natural dye dyed silk fabric is obtained.
(2) Microencapsulation of natural antioxidants: blending tea polyphenol and Arabic gum according to a mass ratio of 1:10, adding tween for dispersion and emulsification, and reacting at 30 ℃ and pH=7 to obtain the natural antioxidant microcapsule.
(3) And (3) placing the natural dye dyed real silk fabric prepared in the step (1) into the natural antioxidant microcapsule dispersion liquid prepared in the step (2) with the mass fraction of 5%, then maintaining the liquid carrying rate of 60% through rolling, and finally drying the real silk fabric at 130 ℃.
Example 3
A method for dyeing real silk fabric by adopting natural dye comprises the following specific steps:
(1) Dyeing natural dye silk: the silk fabric is firstly soaked in chlorophyll natural dye (chlorophyll type) for dyeing, the dyeing condition is 30 ℃, the bath ratio is 1:5, the pH=2, and then the mordant dyeing is carried out by using ashes water, so that the natural dye dyed silk fabric is obtained.
(2) Microencapsulation of natural antioxidants: mixing propyl gallate and acacia in a mass ratio of 2:1, adding sodium dodecyl benzene sulfonate for dispersion and emulsification, and reacting at 50 ℃ and pH=3 to obtain the natural antioxidant microcapsule.
(3) And (3) placing the natural dye dyed real silk fabric prepared in the step (1) into the natural antioxidant microcapsule dispersion liquid prepared in the step (2) with the mass fraction of 20%, then maintaining the liquid carrying rate of 110% through rolling, and finally drying the real silk fabric at 60 ℃.
Example 4
A method for dyeing real silk fabric by adopting natural dye comprises the following specific steps:
(1) Dyeing natural dye silk: firstly, immersing the silk fabric into emodin natural dye (flavonoid) and crocin natural dye (carotenoid) for dyeing, wherein the dyeing condition is 65 ℃, the bath ratio is 1:25, the pH=5, and then mordant dyeing is carried out by alum to obtain the natural dye-dyed silk fabric; fig. 2 is a graph of K/S of a natural dye dyed real silk fabric when the addition amount of mordant alum is 1%, 2% and 3%, respectively, and it can be seen from the graph that the dyeing depth is significantly improved from 2% when the addition amount of alum is 3%.
(2) Microencapsulation of natural antioxidants: mixing propyl gallate and acacia in a mass ratio of 2:1, adding sodium dodecyl benzene sulfonate for dispersion and emulsification, and reacting at 50 ℃ and pH=3 to obtain the natural antioxidant microcapsule.
(3) And (3) placing the natural dye dyed real silk fabric prepared in the step (1) into the natural antioxidant microcapsule dispersion liquid prepared in the step (2) with the mass fraction of 20%, then maintaining the liquid carrying rate of 110% through rolling, and finally drying the real silk fabric at 60 ℃.
Example 5
A method for dyeing real silk fabric by adopting natural dye comprises the following specific steps:
(1) Dyeing natural dye silk: the silk fabric is firstly soaked in emodin natural dye (flavonoid) and crocin natural dye (carotenoid) for dyeing, the dyeing condition is 65 ℃, the bath ratio is 1:25, the pH=5, and then the mordant dyeing is carried out by alum, so that the natural dye dyed silk fabric is obtained.
(2) Microencapsulation of natural antioxidants: mixing N-isopropyl acrylamide and N-butyl acrylate according to a molar ratio of 25:3, adding into water for uniform dispersion, adding propyl gallate, arabic gum and sodium dodecyl benzene sulfonate, uniformly stirring, adding ammonium persulfate and suberic acid diimine succinate, and reacting at 70 ℃ for 4 hours to obtain the natural antioxidant microcapsule. Wherein the mass of propyl gallate, arabic gum, ammonium persulfate and suberic acid diimine succinate is 5%, 2% and 0.3% of the sum of the mass of N-isopropyl acrylamide and N-butyl acrylate respectively.
(3) And (3) placing the natural dye dyed real silk fabric prepared in the step (1) into the natural antioxidant microcapsule dispersion liquid prepared in the step (2) with the mass fraction of 20%, and then rolling to keep the liquid carrying rate of 110%, wherein the temperature of the rolling padding liquid is 25 ℃, and finally drying the real silk fabric at 60 ℃.
Example 6
The difference from example 5 is that n-butyl acrylate was not added in step (2), and the pad bath temperature in the pad press in step (3) was 34 ℃.
Comparative example 1
A method for dyeing real silk fabric by adopting natural dye comprises the following specific steps: the silk fabric is firstly soaked in emodin natural dye (flavonoid) and crocin natural dye (carotenoid) for dyeing, the dyeing condition is 65 ℃, the bath ratio is 1:25, and the pH=5, so that the natural dye dyeing silk fabric is obtained.
Comparative example 2
A method for dyeing real silk fabric by adopting natural dye comprises the following specific steps: the silk fabric is firstly soaked in emodin natural dye (flavonoid) and crocin natural dye (carotenoid) for dyeing, the dyeing condition is 65 ℃, the bath ratio is 1:25, the pH=5, and then the mordant dyeing is carried out by alum, so that the natural dye dyed silk fabric is obtained.
Comparative example 3
The difference from example 4 is that alum was not used for mordant dyeing.
Results testing
The dyed real silk fabrics finally prepared in examples 4 to 7 and comparative examples 1 to 3 were subjected to color fastness detection, wherein the rubbing fastness was measured according to national standard "rubbing fastness for textile color fastness test" GB/T3920-2008, and the washing fastness was measured according to method D (4) of GB/T3921-2008 "washing fastness for textile color fastness test" and the light fastness was measured according to GB/T8426-1998 "textile color fastness test light fastness: sunlight xenon lamp method 2.
Natural color fixing agent and antioxidant Fastness to rubbing/grade Fastness to washing/grade Light fastness/grade Fixation rate%
Comparative example 1 Without any means for 2-3 3 2 65.7
Comparative example 2 Alum 4-5 4 3 80.9
Comparative example 3 Natural antioxidant microcapsule 3 3 4 82.1
Example 4 Natural antioxidant microcapsule and alum 4 4-5 4.5 85.5
Example 5 Thermosensitive natural antioxidant microcapsule and alum 5 5 5 86.3
Example 6 Thermosensitive natural antioxidant microcapsule and alum 84.3
The test results are shown in the table above. It can be seen from the results of comparative examples 1 to 3 and example 4 that alum has a remarkable effect on improving the rubbing fastness and the washing fastness, and the natural antioxidant microcapsules have an effect on improving the light fastness, and the combination of the two can improve the three properties. Example 5 the natural antioxidant microcapsules were further subjected to a temperature sensitive treatment on the basis of example 4, the light fastness was further improved, because the presence of N-isopropylacrylamide can help the microcapsules to be squeezed between the fibers, the light fastness of the natural antioxidant was enhanced, and the rubbing fastness and wash fastness were also improved, because the N-isopropylacrylamide had a softening effect. Example 6 without the addition of N-butyl acrylate, the nip temperature was adjusted to 34℃and the fixation was reduced, so that a critical transition temperature adjustment of N-isopropylacrylamide was necessary.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalent changes and variations in the above-mentioned embodiments can be made by those skilled in the art without departing from the scope of the present invention.

Claims (8)

1. A method for dyeing real silk fabrics by adopting natural dyes, which is characterized by comprising the following steps:
(1) Dyeing natural dye silk: soaking the real silk fabric in natural dye for dyeing, and then mordant dyeing the real silk fabric by using a natural mordant to obtain the natural dye dyed real silk fabric;
(2) Microencapsulation of natural antioxidants: dissolving N-isopropyl acrylamide and N-butyl acrylate in water, adding a natural antioxidant, arabic gum and an emulsifier, uniformly stirring, adding ammonium persulfate and suberic acid diimine succinate, and reacting at 70-80 ℃ for 3-5h to obtain a natural antioxidant microcapsule;
(3) And (3) placing the natural dye dyed real silk fabric obtained in the step (1) into the natural antioxidant microcapsule solution obtained in the step (2), keeping a stable liquid carrying rate through rolling and pressing, and finally drying.
2. The method for dyeing real silk fabrics according to claim 1, wherein the natural dye in the step (1) is one or more of anthraquinones, tannins, flavonoids, chlorophyll, carotenoids and curcumins.
3. A method for dyeing real silk fabrics with natural dyes according to claim 1 or 2, characterized in that the dyeing conditions in step (1) are: the temperature is 30-100 ℃; bath ratio 1 (5-100); the pH value is 2-8.
4. The method for dyeing real silk fabrics with natural dye according to claim 1, wherein the natural mordant in step (1) is one of alum, lime water and ashes water.
5. The method for dyeing real silk fabrics with natural dyes according to claim 1, wherein the natural antioxidants in the step (2) are one or more of propyl gallate, licoflavone and tea polyphenol.
6. A method for dyeing real silk fabrics with natural dyes according to claim 1 or 5 characterized in that the mass ratio of natural antioxidants to gum arabic is 1 (0.5-10).
7. The method for dyeing real silk fabrics with natural dyes according to claim 1, wherein the rolling surplus rate of the rolling in the step (3) is 60% -110%.
8. The method for dyeing real silk fabrics by using natural dyes according to claim 1, wherein the molar ratio of N-isopropyl acrylamide to N-butyl acrylate is 25 (2-3), and the mass of natural antioxidants, arabic gum, ammonium persulfate and suberimide succinate is 3-6%, 3-12%, 1-3% and 0.2-0.5% of the sum of the mass of N-isopropyl acrylamide and N-butyl acrylate respectively; the temperature of the padding liquid of the rolling in the step (3) is 25-28 ℃.
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