Natural vegetable dye dyeing process for blended fabric

Abstract

The invention discloses a natural vegetable dye dyeing process for a blended fabric. The natural vegetable dye dyeing process comprises the following steps: S1, extracting a natural vegetable dye; s2, dyeing: dyeing the blended fabric by adopting a direct dyeing method or mordanting method; the dyeing temperature, the pH value, the dyeing time and the dye concentration of the blended fabric are determined through a direct dyeing method, and on the basis, the blended fabric is dyed through a mordanting method; s3, soaping: soaping the dyed fabric with a soaping solution; the mordanting method comprises a pre-mordanting method, a one-bath mordanting method or a post-mordanting method. According to the natural vegetable dye dyeing process for the blended fabric, the blended fabric is dyed by adopting a natural vegetable dye one-step method, so that the blended fabric has relatively good dry and wet rubbing fastness and soaping fastness, the UPF value of the dyed fabric can be up to 100 +, and the dyed fabric has good ultraviolet resistance. The application range of the natural plant dye is expanded.

Description

Technical Field

[0001] The invention relates to a natural plant dyeing process for blended fabrics, belonging to the technical field of natural plant dyeing. Background Art

[0002] Natural dyes are dyes extracted directly from animals, plants or mineral resources, with little or no chemical synthesis or processing. They are the dyes with the longest history of human use so far. They have a long history of application in textile processing. Until the emergence of synthetic dyes, natural dyes were gradually eliminated and faded out of people's vision. However, with the improvement of environmental awareness in recent years, natural dyes have regained people's attention. However, the poor stability, poor dyeing performance and incomplete color spectrum of natural dyes have seriously restricted their further development. Therefore, the development and application of natural dyes still need further research and improvement. Plant dyes are the most widely used type of natural dyes, mainly from roots, stems, leaves, flowers, fruits and other parts.

[0003] Natural dyes are green and environmentally friendly, and their sources are safe and reliable. Researchers have found that natural dyes extracted from plants have good dyeing properties, so natural dyes are widely used in the field of textile dyeing. Zhang Zhigang and others extracted natural dyes from Eupatorium adenophorum and applied them to wool fabric dyeing. The experimental results show that Eupatorium adenophorum natural dyes have good dyeing properties, and the dyed fabrics have a yellow hue. The friction and washing color fastness of wool fabrics dyed by direct dyeing and mordant dyeing methods both reach level 4-5, and the sunlight color fastness of mordant dyed wool fabrics reaches level 3-4.

[0004] Natural dyes can also be used for functional finishing of textiles, such as insect repellent, antibacterial, anti-ultraviolet and other functional properties. Zou Qingchuan and others extracted lutein-based colorants from marigolds, and mordant-dyed pure cotton knitted fabrics and wool fabrics respectively. The samples showed excellent coloring, anti-ultraviolet and anti-oxidation properties at low dye concentrations. Zhang Yanyun used wormwood natural dyes to dye wool, silk, and modified cotton fabrics, and conducted functional tests on the dyed textiles. The experimental results showed that the dyed fabrics had good anti-ultraviolet, anti-oxidation and antibacterial properties, and the functionality of the fabrics hardly changed after being placed for a period of time.

[0005] Judging from the current research development status, the application of natural dyes in dyeing blended fabrics is still in its infancy, and further screening of natural dyes and mordants suitable for polyester-cotton blended fabrics will be needed in the future.

[0006] In order to improve the color fastness of natural dyes on polyester-cotton blended fabrics, it is necessary to further study the dyeing process to further improve the application properties such as dyeing levelness, rubbing fastness, and soap fastness. In addition, natural dyes can also give fabrics other functionalities. In addition to their environmental advantages, natural dyes also have antibacterial and anti-ultraviolet functions, which greatly increases their application prospects in the market.

[0007] At present, natural dyes are mostly used on natural fibers such as cotton, linen, wool, and silk. How to apply natural plant dyes to the dyeing of blended fabrics containing chemical fibers such as polyester has become a problem to be solved. Summary of the invention

[0008] The invention aims to provide a natural plant dyeing process for blended fabrics, which can apply the natural plant dyes to the dyeing of blended fabrics.

[0009] To solve the above technical problems, the purpose of the present invention is achieved as follows:

[0010] The present invention relates to a natural plant dyeing process for blended fabrics, comprising the following steps:

[0011] S1. Extraction of natural plant dyes;

[0012] S2. Dyeing: dyeing the blended fabric by direct dyeing or mordant dyeing; determining the dyeing temperature, pH value, dyeing time and dye concentration of the blended fabric by direct dyeing, and dyeing the blended fabric by mordant dyeing on this basis;

[0013] S3, soaping: soaping the dyed fabric with soaping liquid;

[0014] The mordanting method includes a pre-mordanting method, a one-bath mordanting method or a post-mordanting method.

[0015] On the basis of the above scheme and as a preferred scheme of the above scheme: the natural plant dye is taken from Kunlun snow chrysanthemum or eucalyptus.

[0016] On the basis of the above scheme and as a preferred scheme of the above scheme: the extraction process of the natural plant dye from Kunlun snow chrysanthemum is as follows:

[0017] The pedicel part of the dried Kunlun snow chrysanthemum is removed, and the flower part is fully dried in a hot air oven to ensure that the moisture in the flower is completely dried and discharged, and then the ball mill is used to fully grind for 30 minutes at a speed of 460r / min, and the ground coarse Kunlun snow chrysanthemum powder is fully sieved with a fine mesh screen (60 mesh screen), and the receptacle hard shell particles that cannot be ground are separated from the Kunlun snow chrysanthemum fine powder; the obtained Kunlun snow chrysanthemum powder is stored;

[0018] The fine powder of Kunlun snow chrysanthemum obtained by ball mill grinding (460r / min, 30min) was dissolved in water, and the pH was adjusted to 9.5 with sodium hydroxide solution and then fully stirred. Then, the obtained Kunlun snow chrysanthemum stock solution was transferred to a microwave oven, and the microwave effect of the microwave oven was used to further assist in extracting the dye, with a working time of 1.5min and a power of 500W;

[0019] Afterwards, the dye solution after microwave treatment is filtered by using a vacuum filter, and the filtrate is taken and the obtained dye solution is cooled to room temperature and the pH value of the dye solution is adjusted before use for dyeing.

[0020] On the basis of the above scheme and as a preferred scheme of the above scheme: the extraction process of the natural plant dye from eucalyptus is as follows:

[0021] Put fresh eucalyptus bark into an oven and dry it at 100°C for 2 hours. After the eucalyptus bark is completely dried, grind it with a grinder and put it into a planetary ball mill for further fine grinding. Set the grinding speed to 480r / min and the grinding time to 30min. After the eucalyptus bark powder is ground finer, put it into a sieve to sieve out the ground eucalyptus bark powder and put it into a bottle for later use.

[0022] The ground eucalyptus bark powder was dissolved in water with a solid-liquid ratio of 1g dye: 50mL water. The pH of the solution was adjusted to 10 using sodium hydroxide solution, and then the solution was fully stirred. The resulting solution was placed in a microwave device and extracted with a microwave at medium-high power (600W) for 90s. The dye solution after microwave treatment was then filtered using a vacuum filter, and the filtrate was used as a dye.

[0023] On the basis of the above scheme and as a preferred scheme of the above scheme: the mordant used in the mordant dyeing method includes an industrial-grade mordant and a natural mordant, the industrial-grade mordant is ferric sulfate, copper sulfate, ferrous sulfate, potassium aluminum sulfate or tannic acid, and the natural mordant is gallnut or pomegranate peel.

[0024] On the basis of the above scheme and as a preferred scheme of the above scheme: the steps of the direct dyeing method are as follows:

[0025] Weigh a certain weight of the blended fabric, set the pH value of the dye solution to 4-8, the temperature of the dyeing process to 100-140°C, the concentration of the dye solution to 5-100g / L, and the dyeing time to 20-100min;

[0026] After dyeing, wash the fabric, soap it, rinse it, and dry it.

[0027] On the basis of the above scheme and as a preferred scheme of the above scheme: the pre-mordanting method for the blended fabric comprises the following steps:

[0028] The blended fabric is placed in an aqueous solution containing a mordant, and after pre-mordanting at a set temperature for a certain period of time, the blended fabric is taken out and washed, and then placed in a dye solution containing natural plant dyes, heated to the set temperature for dyeing, and then taken out and washed with water, then soaped, and finally dried.

[0029] On the basis of the above scheme and as a preferred scheme of the above scheme: the one-bath mordant dyeing method for blended fabrics comprises the following steps:

[0030] The blended fabric is placed in a dyeing solution containing a mordant and natural plant dyes, heated to a set temperature for dyeing, taken out, washed with water, and then soaped and dried.

[0031] On the basis of the above scheme and as a preferred scheme of the above scheme: the post-mordant dyeing method for the blended fabric comprises the following steps:

[0032] The blended fabric is placed in a dye solution containing natural plant dyes, heated to a set temperature for dyeing, taken out and washed with water after dyeing, and then the dyed blended fabric is placed in an aqueous solution containing a mordant for mordant dyeing at a set temperature, taken out and washed with water, and then soaped and dried.

[0033] The beneficial effects of the present invention are as follows: the natural plant dyeing process for blended fabrics involved in the present invention uses natural plant dyes to dye blended fabrics, thereby achieving the effect of using one natural dye to color two types of fibers at the same time. The process has good dry and wet friction fastness, soap washing color fastness and sunlight resistance, and the UPF value of the dyed fabric can reach up to 100+, which has good anti-ultraviolet performance. The application scope of natural plant dyes is expanded. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is the dyeing process curve of direct dyeing method;

[0035] Figure 2 It is the dyeing process curve of the same-bath mordant method;

[0036] Figure 3 It is the dyeing process curve of pre-mordanting method;

[0037] Figure 4 It is the dyeing process curve of post-mordant dyeing method;

[0038] Figure 5 is the relationship curve between different pH values ​​and K / S values ​​of dyed fabrics in Examples 1 to 5;

[0039] Figure 6 It is the relationship curve of K / S value of dyed fabrics at different dyeing temperatures;

[0040] Figure 7 It is the relationship curve of K / S value of dyed fabrics with different dyeing times;

[0041] Figure 8 It is the relationship curve of different dye concentrations on the K / S value of dyed fabrics;

[0042] Fig. 9 It is a bar graph of K / S values ​​of fabrics dyed with different mordant methods using metal mordants;

[0043] Fig.10 It is a bar graph of K / S values ​​of fabrics dyed with different amounts of metal mordant;

[0044] Fig.11 It is a bar chart of K / S values ​​of fabrics dyed with natural mordants and different mordant methods;

[0045] Fig.12 It is a bar graph of K / S values ​​of fabrics dyed with different amounts of natural mordant. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with specific embodiments.

[0047] The invention relates to a natural plant dyeing process for blended fabrics, wherein the fabric used is a semi-bleached polyester-cotton 65 / 35 blended fabric. The experimental instruments used are shown in Table 1, and the experimental drugs used are shown in Table 2.

[0048] Table 1 Experimental instruments

[0049]

[0050]

[0051] Table 2 Experimental drugs

[0052]

[0053] Taking the natural plant dye extracted from Kunlun snow chrysanthemum as an example, the extraction process of the natural dye is as follows: remove the pedicel part of the dried Kunlun snow chrysanthemum, take the flower part and fully dry it in a hot air oven to ensure that the moisture in the flower is thoroughly dried and discharged, then use a ball mill to fully grind for 30 minutes at a speed of 460r / min, and fully sieve the ground coarse Kunlun snow chrysanthemum powder with a fine mesh screen (60 mesh screen), and separate the receptacle hard shell particles that cannot be ground from the Kunlun snow chrysanthemum fine powder. Save the obtained Kunlun snow chrysanthemum powder. The Kunlun snow chrysanthemum fine powder obtained by ball mill grinding (460r / min, 30min) is dissolved in water, and the pH is adjusted to 9.5 with sodium hydroxide solution and then fully stirred. After that, the obtained Kunlun snow chrysanthemum stock solution is transferred to a microwave oven, and the microwave effect of the microwave oven is used to further assist in extracting the dye, with a working time of 1.5min and a power of 500W. After that, the dye liquor after microwave treatment is filtered using a vacuum filter, and the filtrate is used to adjust the pH of the dye liquor after the obtained dye liquor is cooled to room temperature for dyeing.

[0054] At present, natural dyes have been widely used in the dyeing of natural fibers, but there are few studies on their use in the dyeing of synthetic fibers, and even fewer natural dyes and dyeing processes for blends of natural and synthetic fibers, such as polyester-cotton blended fabrics. Therefore, it is necessary to conduct a feasibility study on the application of natural dyes for the dyeing of polyester-cotton blended fabrics to further expand the application scope of natural dyes. Using the natural dye Kunlun snow chrysanthemum, a series of single-factor experiments were designed from the aspects of temperature, pH value, dyeing time, concentration, etc. without adding any mordant, and the K / S value of each group of dyed cloth samples was tested by an electronic colorimeter to obtain the best dyeing process.

[0055] Examples 1 to 5

[0056] Effect of dye solution pH value on dyeing effect: Accurately weigh 5 pieces of 1.50g polyester-cotton blended fabrics, dye the fabrics according to the direct dyeing method, set the dyeing pH values ​​to 4, 5, 6, 7, and 8, respectively, and the dyeing process conditions are dyeing temperature of 120℃, dyeing time of 60min, dyeing bath ratio of 1:40, and dye solution concentration of 20g / L. After dyeing, the fabrics are washed, soaped, washed, and dried, and their K / S value is tested.

[0057] Example 6 to Example 11

[0058] Influence of dyeing temperature on dyeing effect: accurately weigh 6 pieces of 1.50g polyester-cotton blended fabrics, dye the fabrics according to the direct dyeing method, set the dyeing temperatures to 100, 110, 120, 130, 135, and 140℃, respectively, and the dyeing process conditions are dyeing time 60min, dyeing pH 5, dyeing bath ratio 1:40, and dyeing solution concentration 20g / L. After dyeing, the fabrics are washed, soaped, washed, and dried, and their K / S value is tested.

[0059] Example 12 to Example 16

[0060] Influence of dyeing time on dyeing effect: Accurately weigh 5 pieces of 1.50g polyester-cotton blended fabrics, dye the fabrics according to the direct dyeing method, set the dyeing time to 20, 40, 60, 80, and 100min respectively, and the dyeing process conditions are dyeing pH 5, dyeing temperature 135℃, dyeing bath ratio 1:40, and dyeing solution concentration 20g / L. After dyeing, the fabrics are washed, soaped, washed, and dried, and their K / S value is tested.

[0061] Example 17 to Example 22

[0062] Effect of dye concentration on dyeing effect: Accurately weigh 6 pieces of 1.5g polyester-cotton blended fabrics, dye the fabrics according to the direct dyeing method, set the dye concentrations to 5, 15, 20, 25, 50, and 100g / L, respectively. The dyeing process conditions are dyeing pH 5, dyeing temperature 135℃, dyeing bath ratio 1:40, and dyeing solution concentration 20g / L. After dyeing, the fabrics are washed, soaped, washed, and dried, and their K / S value is tested.

[0063] The K / S value of the dyed fabrics prepared in Examples 1 to 5 was tested, and the polyester-cotton blended fabrics were dyed with natural dye Kunlun snow chrysanthemum dye liquor with different pH values. The dyeing results are shown in FIG. Figure 5 And as shown in Table 3.

[0064] Table 3 Effect of different pH values ​​on dyeing effect

[0065]

[0066] Depend on Figure 5 As shown in Table 3, when the pH value of the dye solution is 4 and 5, the K / S value of Kunlun snow chrysanthemum pigment dyeing is higher, and with the increase of pH value, the K / S value gradually decreases.

[0067] From the L value in Table 3, the smaller the L value, the lower the lightness of the fabric sample and the darker the color. When the pH value of the dye solution gradually increases from 4 to 8, the fabric surface color is dark when the pH value is 4 or 5, and finally when the pH value of the dye solution gradually increases to 8, the color of the fabric sample gradually becomes lighter.

[0068] The K / S value of the dyed fabrics prepared in Examples 6 to 11 was tested. The polyester-cotton blended fabrics were dyed at different temperatures. The dyeing results are shown in FIG. Figure 6 And as shown in Table 4.

[0069] Table 4 Effect of different temperatures on dyeing effect

[0070]

[0071] Depend on Figure 6It can be seen that as the dyeing temperature increases, the K / S value of the dyed fabric gradually increases. This is because the higher the dyeing temperature, the greater the fiber expansion, the faster the dye movement in the dye bath, and more dye enters the fiber, increasing the dye on the fiber; polyester fiber is a thermoplastic fiber with high crystallinity and dense fiber structure. Therefore, under the combined effect of high temperature environment and water molecule plasticization, the movement of fiber macromolecular segments intensifies, which is conducive to the diffusion of Kunlun snow chrysanthemum dye molecules into the fiber. When the dyeing temperature is higher than 135°C, the increase in the K / S value of the dyed fabric gradually becomes gentle. Taking the dyeing cost into consideration, the dyeing temperature can be 135°C when dyeing with natural dye Kunlun snow chrysanthemum.

[0072] From the L value in Table 4, the smaller the L value, the lower the brightness of the fabric and the darker the color looks. When the dyeing temperature gradually increases from 100°C to 140°C, the polyester-cotton blended fabric dyed with the natural dye Kunlun snow chrysanthemum as the dye liquid gradually changes from light yellow to darker. When the dyeing temperature reaches 135°C, the color of the fabric tends to be stable.

[0073] The K / S value of the dyed fabrics prepared in Examples 12 to 16 was tested. The dyeing time was used to dye the polyester-cotton blended fabric. The dyeing results are shown in FIG. Figure 7 And as shown in Table 5.

[0074] Depend on Figure 7 As shown in Table 5, the K / S value of the dyed polyester-cotton blended fabric gradually increases with the increase of dyeing time, and the increasing trend gradually slows down when the dyeing time is 80 minutes. When the dyeing time is greater than or equal to 80 minutes, the K / S value of the dyed fabric remains basically unchanged. This is because the dye is first adsorbed on the fiber surface during the dyeing process, and then slowly diffuses into the fiber. As the dyeing time continues to increase, more dye enters the fiber, and the dyed fabric becomes darker. After 80 minutes, the dyeing gradually tends to balance. When the dyeing time reaches 100 minutes, the fabric color and K / S value also tend to be stable. Therefore, the optimal dyeing time determined in this experiment is 80 minutes.

[0075] Table 5 Effect of different time on dyeing effect

[0076]

[0077] The K / S value of the dyed fabrics prepared in Examples 17 to 22 was tested, and different concentrations of natural dye Kunlun snow chrysanthemum dyeing liquid were prepared and used to dye polyester-cotton blended fabrics. The dyeing effects were as follows: Figure 8 and as shown in Table 6.

[0078] Table 6 Effect of different concentrations on dyeing effect

[0079]

[0080] Depend on Figure 8 It can be seen that the K / S value of the polyester-cotton blended fabric after dyeing with the natural dye Kunlun snow chrysanthemum shows a gradual increase with the increase of dye concentration. This may be because the increase in dye concentration helps to increase the probability of dye molecules contacting the fiber, thereby accelerating the adsorption rate of the dye and promoting dye diffusion. The high concentration of dye allows more dye molecules to adsorb and diffuse into the fiber, increasing the color yield. When the dye concentration is 50g / L, the K / S value of the Kunlun snow chrysanthemum dyed fabric has a maximum value. After that, the dye concentration is increased, and the K / S value of the dyed fabric does not change much.

[0081] From the L value in Table 6, the smaller the L value, the darker the color of the fabric. When the dye concentration is 5g / L, the color of the dyed fabric is very light. As the concentration increases, the color of the fabric gradually becomes darker. When the dye concentration reaches 20g / L, the color of the fabric tends to be stable. Although the maximum K / S value of 4.86 can be obtained when the dye concentration is 50g / L, compared with the K / S value of 4.13 when the dye concentration is 20g / L, the K / S value has not been greatly improved after adding nearly double the dye. Therefore, the optimal condition is selected as 20g / L after comprehensive evaluation of economic cost and fabric color.

[0082] Through direct dyeing, the dyeing process is as follows: the amount of natural dye is 20g / L, the bath ratio is 1:40, the pH value of the dye solution is 5, the dyeing temperature is 135℃, and the dyeing time is 80min. On this basis, mordants are used to dye polyester-cotton blended fabrics with five industrial-grade mordants, namely ferric sulfate, copper sulfate, ferrous sulfate, potassium aluminum sulfate and tannic acid, as well as two natural mordants, namely gallnut and pomegranate. Different mordants are first subjected to pre-mordant dyeing, same-bath mordant dyeing and post-mordant dyeing to find out the best mordant dyeing method for each mordant. Then, experiments are conducted to explore the influence of the amount of each mordant on the dyeing rate of the natural dye Kunlun snow chrysanthemum. By comparing the K / S value after each fabric sample is dyed, the best mordant dyeing method and dyeing process under the condition of using mordant are analyzed.

[0083] Example 23 to Example 29

[0084] This group of embodiments adopts the pre-mordanting method for dyeing, and the specific process is as follows:

[0085] 1.5g of polyester-cotton blended fabric is put into 30mL of 2% owf mordant aqueous solution, pre-mordanted at 70℃ for 30min, then the fabric is taken out for washing, put into 60mL of 20g / L Kunlun snow chrysanthemum dye aqueous solution, slowly heated to 135℃ at a heating rate of 2℃ / min, taken out for washing after dyeing for 80min, soaped at 60℃ for 10min with 1g / L soaping agent, and then dried, and its K / S value is tested. The mordants used are ferric sulfate, copper sulfate, ferrous sulfate, potassium aluminum sulfate, tannic acid, gallnut or pomegranate peel.

[0086] Example 30 to Example 36

[0087] This group of embodiments adopts the same-bath mordant method for dyeing, and the specific process is as follows:

[0088] 1.5g of polyester-cotton blended fabric was put into a mixed solution containing 30mL of 2% owf mordant and 60mL of 20g / L Kunlun snow chrysanthemum dye solution, with a bath ratio of 1:40, and slowly heated to 135℃ at a heating rate of 2℃ / min. After dyeing for 80min, it was washed with 1g / L soaping agent at 70℃ for 10 minutes and then dried to test its K / S value. The mordants used were ferric sulfate, copper sulfate, ferrous sulfate, potassium aluminum sulfate, tannic acid, gallnut or pomegranate peel.

[0089] Example 37 to Example 43

[0090] This group of embodiments adopts post-mordant dyeing method for dyeing, and the specific process is as follows:

[0091] 1.5g of polyester-cotton blended fabric was placed in 60mL of 20g / L Kunlun snow chrysanthemum dye solution, slowly heated to 135℃ at a heating rate of 2℃ / min, taken out and washed after dyeing for 80min, placed in 30mL of an aqueous solution containing 2% owf mordant at 70℃ for 30min, taken out and washed, soaped at 70℃ for 10 minutes with 1g / L soaping agent, and then dried to test its K / S value. The mordants used were ferric sulfate, copper sulfate, ferrous sulfate, potassium aluminum sulfate, tannic acid, gallnut or pomegranate peel.

[0092] For Examples 23 to 43, various mordant dyeing methods using industrial grade mordants were compared with direct dyeing. Direct dyeing is direct dyeing without using a mordant in Example 30. The dyeing results are shown in Fig. 9 and Table 7. And in each group of mordant methods in the table, from left to right are ferric sulfate, cupric sulfate, ferrous sulfate, alum and tannic acid.

[0093] Depend on Fig. 9From Table 7, we can see that in general, the four mordants, namely, ferric sulfate, copper sulfate, ferrous sulfate and alum, have better dyeing effects under the post-mordant method, while tannic acid performs best under the same-mordant method. The specific analysis is as follows:

[0094] Table 7 Chroma values ​​of fabrics dyed with different mordants and dyeing methods

[0095]

[0096] In the pre-mordanting method, using ferric sulfate, cupric sulfate, ferrous sulfate, alum and tannic acid as mordants has little effect on the dyeing of Kunlun snow chrysanthemum polyester-cotton blended fabrics.

[0097] In the same bath mordant dyeing method, metal ions may first complex with Kunlun snow chrysanthemum pigments. The molecular structure of the complex is larger than that of the original dye molecules, so dyeing is relatively slow, and there is more floating color, which is easy to be removed in the later washing and soaping process, resulting in a lower color depth of the fabric. According to the experimental test results, only tannic acid has a slightly better dyeing effect in the same mordant method.

[0098] In post-mordant dyeing, except for tannic acid as a mordant, when using several other mordants, the color of the fabric is greatly improved compared to direct dyeing.

[0099] Example 43 to Example 62

[0100] Accurately prepare 5 portions of 20g / L natural dye Kunlun snow chrysanthemum dye solution, 60mL each, add 1%, 2%, 3%, 4%, 5% owf of iron sulfate, cupric sulfate, ferrous sulfate or alum respectively, add 1.5g of polyester-cotton blended fabric, slowly heat to 135℃ at a heating rate of 2℃ / min, take out and wash after dyeing for 80min, use 1g / L soaping agent to soap at 70℃ for 10 minutes and then dry, and test its K / S value.

[0101] Example 63 to Example 77

[0102] Accurately prepare 5 portions of 20g / L natural dye Kunlun snow chrysanthemum dye solution, each 60mL, add 1%, 5%, 10%, 15%, 20% owf gallnut or pomegranate peel, or add 1%, 2%, 3%, 4%, 5% owf tannic acid, add 1.5g polyester-cotton blended fabric, slowly heat to 135℃ at a heating rate of 2℃ / min, take out and wash after dyeing for 80min, use 1g / L soaping agent to soap at 70℃ for 10 minutes and then dry, and test its K / S value.

[0103] The polyester-cotton fabric was dyed by post-mordant dyeing using different dosages of four mordants: ferric sulfate, copper sulfate, ferrous sulfate and alum, while tannic acid was dyed by homo-mordant dyeing. Fig.10 and as shown in Table 8.

[0104] Table 8 Chroma values ​​of dyed fabrics with different mordant dosages

[0105]

[0106]

[0107] Depend on Fig.10 As shown in Table 8, when the amount of dye is fixed, the K / S value of the dyed fabric increases greatly when the amount of ferrous sulfate and ferrous sulfate increases from 1% (owf) to 2% (owf) as the amount of mordant increases. When the amount of mordant is further increased, the K / S value of the fabric does not change significantly. The K / S value of copper sulfate, alum and tannic acid reaches the maximum K / S value when the amount is 5% (owf).

[0108] The influence of the process conditions of natural mordant on the dyeing effect was analyzed. The results are shown in Fig.11 and Table 9. Fig.11 In each set of mordant methods, the left side is gallnut and the right side is pomegranate peel.

[0109] Table 9 Chroma values ​​of fabrics dyed with different mordants and dyeing methods

[0110]

[0111] Depend on Fig.11 As shown in Table 9, the two mordants, gallnut and pomegranate peel, have better dyeing effects in the same bath mordant method. Compared with dyeing without mordant, the K / S value is slightly improved, which also proves the feasibility of natural mordant.

[0112] The effect of the amount of natural mordant on the dyeing effect was analyzed. The results are shown in Fig.12 and Table 10. Fig.12 In each set of mordant methods, the left side is gallnut and the right side is pomegranate peel.

[0113] Table 10 Chroma values ​​of dyed fabrics with different mordant dosages

[0114]

[0115]

[0116] Through the above experiments, the optimal dyeing process of Kunlun snow chrysanthemum, a natural dye, was obtained. On this basis, the various properties of the dyed cloth samples under the optimal process were tested. The specific operations are as follows: the dosage of the three mordants, tannic acid, copper sulfate, and alum, is 5% (owf), the dosage of ferric sulfate and ferrous sulfate mordants is 2% (owf), the dosage of gallnut and pomegranate peel mordants is 20% (owf), the pH value of the dye solution is 5, the dyeing temperature is 135°C, and the dyeing time is 80 min. Tannic acid, gallnut and pomegranate peel are dyed by the same mordant method, while ferric sulfate, copper sulfate, ferrous sulfate, and alum are dyed by the post-mordant method. The various properties of the dyed fabrics are shown in Table 11.

[0117] Table 11 Properties of dyed polyester-cotton blended fabrics

[0118]

[0119] Performance test items and standards are as follows:

[0120] (1) Dry / wet rubbing fastness test

[0121] For details, please refer to the corresponding method in GB / T29865-2013 standard "Textiles - Tests for Colour Fastness - Colour Fastness to Rubbing - Small Area Method".

[0122] (2) Soap fastness test

[0123] For details, please refer to the corresponding methods in GB / T3921-2008 standard "Textiles - Tests for Colour Fastness - Colour Fastness to Washing with Soap".

[0124] (3) Light fastness test

[0125] For details, please refer to the corresponding methods in GB / T8427-2008 standard "Textiles - Tests for colour fastness - Colour fastness to artificial light: Xenon arc fading lamp".

[0126] (4) Anti-ultraviolet performance

[0127] Please refer to the corresponding methods in GB / T 18830-2009 standard "Evaluation of UV protection performance of textiles".

[0128] (5) Breaking strength test

[0129] For details, please refer to GB / T 39231-2013 standard "Tensile properties of textile fabrics - Part 1: Determination of breaking strength and elongation at break (strip method)"

[0130] As shown in Table 11, the polyester-cotton blended fabric was dyed with the natural dye Kunlun snow chrysanthemum under the optimal dyeing conditions under high temperature and high pressure. The color fastness of the dyed polyester-cotton blended fabric samples to dry and wet friction and soap washing was improved. In the test of color fastness to sunlight, the fabric samples dyed with three mordants, iron sulfate, copper sulfate and ferrous sulfate, performed exceptionally well. From the experimental test results, it can be seen that the UPF value of the polyester-cotton blended original fabric is 35, while the UPF value of the polyester-cotton blended fabric dyed with the natural dye Kunlun snow chrysanthemum can reach 100+, indicating that the anti-ultraviolet performance of the fabric can be greatly improved after dyeing with the natural dye Kunlun snow chrysanthemum. This may be because the main components of the natural dye Kunlun snow chrysanthemum dye are flavonoids and other compounds. These substances contain carbonyl, benzene ring and hydroxyl groups, which can effectively absorb ultraviolet light bands, thus giving the fabric a certain anti-ultraviolet performance. In the breaking strength test, the breaking strength of the fabric samples after dyeing with natural dyes did not change significantly, and some even increased slightly. Finally, under the observation of the electron microscope, we can clearly observe the microstructure of the fiber. Compared with the electron microscope image of the undyed polyester-cotton blended original cloth, there is no obvious change in the surface of the fabric fiber after dyeing with the natural dye Kunlun snow chrysanthemum, indicating that the fabric was not obviously damaged during the dyeing process. However, compared with the original cloth, some attachments can be seen on the surface of the dyed fabric fibers.

[0131] Embodiment 78

[0132] The eucalyptus pigment used in this embodiment has the following specific dyeing process: put 2.5 grams of polyester-cotton blended fabric into the dyeing solution of natural plant dye, with a bath ratio of 1:40, a pH value of the dyeing solution of 5, and a dye dosage of 20 g / L; heat the fabric to 135°C at 2°C / min for dyeing, wash it with water, and then wash it with soap and dry it.

[0133] The extraction process of the natural plant dye from eucalyptus bark is as follows:

[0134] Put fresh eucalyptus bark into an oven and dry it at 100°C for 2 hours. After the eucalyptus bark is completely dried, grind it with a grinder and put it into a planetary ball mill for further fine grinding. Set the grinding speed to 480r / min and the grinding time to 30min. After the eucalyptus bark powder is ground finer, put it into a sieve to sieve out the ground eucalyptus bark powder and put it into a bottle for later use.

[0135] The ground eucalyptus bark powder was dissolved in water with a solid-liquid ratio of 1g dye: 50mL water. The pH of the solution was adjusted to 10 using sodium hydroxide solution, and then the solution was fully stirred. The resulting solution was placed in a microwave device and extracted with a microwave at medium-high power (600W) for 90s. The dye solution after microwave treatment was then filtered using a vacuum filter, and the filtrate was used as a dye.

[0136] Embodiment 79

[0137] The eucalyptus pigment used in this embodiment has the following specific dyeing process: 2.5 grams of polyester-cotton blended fabric is placed in a dyeing solution of 2% ferrous sulfate and natural plant dye, with a bath ratio of 1:40, a dyeing solution pH of 5, and a dyeing amount of 20 g / L; the temperature is raised to 135°C at 2°C / min for dyeing, and the fabric is washed with water, soaped, and dried after being taken out.

[0138] Embodiment 80

[0139] The eucalyptus pigment used in this embodiment has the following specific dyeing process: 2.5 grams of polyester-cotton blended fabric is placed in a dyeing solution of 2% iron sulfate and natural plant dye, with a bath ratio of 1:40, a dyeing solution pH of 5, and a dyeing amount of 20 g / L; the temperature is raised to 135°C at 2°C / min for dyeing, and after taking out, it is washed with water, and then soaped and dried.

[0140] Embodiment 81

[0141] The eucalyptus pigment used in this embodiment has the following specific dyeing process: 2.5 grams of polyester-cotton blended fabric is placed in a dyeing solution of 5% copper sulfate and natural plant dye, with a bath ratio of 1:40, a dyeing solution pH of 5, and a dyeing amount of 20 g / L; the temperature is raised to 135°C at 2°C / min for dyeing, and the fabric is washed with water, soaped, and dried after being taken out.

[0142] Embodiment 82

[0143] The eucalyptus pigment used in this embodiment has the following specific dyeing process: 2.5 grams of polyester-cotton blended fabric is placed in a dyeing solution of 20% gallnut and natural plant dye, with a bath ratio of 1:40, a dyeing solution pH of 5, and a dyeing amount of 20 g / L; the temperature is raised to 135°C at 2°C / min for dyeing, and the fabric is washed with water, soaped, and dried after being taken out.

[0144] Embodiment 81

[0145] The eucalyptus pigment used in this embodiment has the following specific dyeing process: 2.5 grams of polyester-cotton blended fabric is placed in a dyeing solution of 5% pomegranate peel and natural plant dye, with a bath ratio of 1:40, a dyeing solution pH of 5, and a dyeing amount of 20 g / L; the temperature is raised to 135°C at 2°C / min for dyeing, and the fabric is washed with water, soaped, and dried after being taken out.

[0146] Table 12 polyester-cotton blended fabric dyeing results

[0147]

[0148]

[0149] Table 13 Dyeing properties of polyester-cotton blended fabrics

[0150]

[0151] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A process for dyeing blended fabrics with natural plant dyes, characterized in that: The steps include: S1. Extraction of natural plant dyes; S2. Dyeing: dyeing the blended fabric by direct dyeing or mordant dyeing; determining the dyeing temperature, pH value, dyeing time and dye concentration of the blended fabric by direct dyeing, and dyeing the blended fabric by mordant dyeing on this basis; S3, soaping: soaping the dyed fabric with soaping liquid; The mordanting method includes a pre-mordanting method, a homo-mordanting method or a post-mordanting method.

2. A blended fabric natural plant dyeing process according to claim 1, characterized in that: The natural plant dye is taken from Kunlun snow chrysanthemum or eucalyptus.

3. A blended fabric natural plant dyeing process according to claim 2, characterized in that: The extraction process of the natural plant dye from Kunlun snow chrysanthemum is as follows: The pedicel part of the dried Kunlun snow chrysanthemum is removed, and the flower part is fully dried in a hot air oven to ensure that the moisture in the flower is completely dried and discharged, and then the ball mill is used to fully grind for 30 minutes at a speed of 460r / min, and the ground coarse Kunlun snow chrysanthemum powder is fully sieved with a fine mesh screen (60 mesh screen), and the receptacle hard shell particles that cannot be ground are separated from the Kunlun snow chrysanthemum fine powder; the obtained Kunlun snow chrysanthemum powder is stored; The fine powder of Kunlun snow chrysanthemum obtained by ball mill grinding (460r / min, 30min) was dissolved in water, and the pH was adjusted to 9.5 with sodium hydroxide solution and then fully stirred. Then, the obtained Kunlun snow chrysanthemum stock solution was transferred to a microwave oven, and the microwave effect of the microwave oven was used to further assist in extracting the dye, with a working time of 1.5min and a power of 500W; Afterwards, the dye solution after microwave treatment is filtered by using a vacuum filter, and the filtrate is taken and the obtained dye solution is cooled to room temperature and the pH value of the dye solution is adjusted before use for dyeing.

4. A blended fabric natural plant dyeing process according to claim 2, characterized in that: The extraction process of the natural plant dye from eucalyptus is as follows: Put fresh eucalyptus bark into an oven and dry it at 100°C for 2 hours. After the eucalyptus bark is completely dried, grind it with a grinder and put it into a planetary ball mill for further fine grinding. Set the grinding speed to 480r / min and the grinding time to 30min. After the eucalyptus bark powder is ground finer, put it into a sieve to sieve out the ground eucalyptus bark powder and put it into a bottle for later use. The ground eucalyptus bark powder was dissolved in water with a solid-liquid ratio of 1g dye: 50mL water. The pH of the solution was adjusted to 10 using sodium hydroxide solution, and then the solution was fully stirred. The resulting solution was placed in a microwave device and extracted with a microwave at medium-high power (600W) for 90s. The dye solution after microwave treatment was then filtered using a vacuum filter, and the filtrate was used as a dye.

5. A blended fabric natural plant dyeing process according to claim 1, characterized in that: The mordant used in the mordant method includes an industrial-grade mordant and a natural mordant. The industrial-grade mordant is ferric sulfate, copper sulfate, ferrous sulfate, potassium aluminum sulfate or tannic acid, and the natural mordant is gallnut or pomegranate peel.

6. A blended fabric natural plant dyeing process according to claim 1, characterized in that: The steps of the direct staining method are as follows: Weigh a certain weight of the blended fabric, set the pH value of the dye solution to 4-8, the temperature of the dyeing process to 100-140°C, the concentration of the dye solution to 5-100g / L, and the dyeing time to 20-100min; After dyeing, wash the fabric, soap it, rinse it, and dry it.

7. A natural plant dyeing process for blended fabrics according to claim 1, characterized in that: The pre-mordanting process for blended fabrics includes the following steps: The blended fabric is placed in an aqueous solution containing a mordant, and after pre-mordanting at a set temperature for a certain period of time, the blended fabric is taken out and washed with water, and then placed in a dye solution containing natural plant dyes, heated to the set temperature for dyeing, and then taken out and washed with water, then soaped, and finally dried.

8. A natural plant dyeing process for blended fabrics according to claim 1, characterized in that: The one-bath mordant dyeing method for blended fabrics includes the following steps: The blended fabric is placed in a dye solution containing a mordant and natural plant dyes, heated to a set temperature for dyeing, taken out, washed with water, and then soaped and dried.

9. A natural plant dyeing process for blended fabrics according to claim 1, characterized in that: The post-mordant dyeing process for blended fabrics includes the following steps: The blended fabric is placed in a dye solution containing natural plant dyes, heated to a set temperature for dyeing, taken out and washed with water after dyeing, and then the dyed blended fabric is placed in an aqueous solution containing a mordant for mordant dyeing at a set temperature, taken out and washed with water, and then soaped and dried.

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