CN112430399B

CN112430399B - Safflower yellow, preparation method and dyeing method thereof

Info

Publication number: CN112430399B
Application number: CN202011340169.3A
Authority: CN
Inventors: 杨建军
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2022-02-18
Anticipated expiration: 2040-11-25
Also published as: CN112430399A

Abstract

The invention provides safflower yellow, a preparation method and a dyeing method thereof. The preparation method of the safflower yellow comprises the following steps: soaking Carthami flos in water, squeezing the Carthami flos, and collecting yellow pigment liquid, wherein the temperature of the water is below 50 deg.C. The safflower yellow of the invention can be extracted from safflower, and the preparation process of the safflower yellow is green and pollution-free, is beneficial to environmental protection and health, and does not damage the safflower red. Furthermore, the safflower yellow of the invention is simple and convenient to operate, environment-friendly and harmless when being dyed; is especially suitable for dyeing wool fiber.

Description

Safflower yellow, preparation method and dyeing method thereof

Technical Field

The invention relates to safflower yellow, a preparation method and a dyeing method thereof, belonging to the field of dyes.

Background

Carthami flos is an annual (spring sowing) or biennial (autumn sowing) Compositae herb, and its petal contains safflower yellow and safflower red. The safflower yellow (the scientific name is Safflargelb) is a chalcone compound, is a water-soluble natural yellow with higher content, and has wide application range. The safflower yellow has the advantages of bright color, high temperature resistance, acid resistance, light resistance, reduction resistance, microorganism resistance and the like, and can be used as a natural yellow dye. It has good dyeing effect, and is especially suitable for dyeing protein fibers such as wool, silk and the like.

Chemical dyes used in the printing and dyeing industry have serious influence on the natural environment and certain harm to the health of producers and users. Therefore, in recent years, green ecological dyeing techniques for dyeing by extracting pigments from natural plant materials have been developed rapidly. However, from the current prior art literature, safflor yellow is mainly used for: 1. food coloring: safflower yellow has been approved as an edible natural pigment for approved use. As a natural colorant, the natural colorant is widely used in the food and beverage processing industry. 2. Chinese herbal medicines: the safflower yellow has various pharmacological functions of dilating coronary artery, resisting oxidation, protecting cardiac muscle, lowering blood pressure, suppressing immunity, protecting brain, etc., and is widely used in the field of medicine.

In the prior art, natural yellow dyes such as gardenia, turmeric, scutellaria, coptis, sophora japonica, cotinus coggygria and the like are mainly used in the textile printing and dyeing industry (such as patent application document, application number: 201510335664.8, invention name: medicinal plant dyed clothes with environmental protection effect and manufacturing method), and related prior art documents using safflower yellow are not seen.

However, since the safflower yellow is stored together with the safflower red in the safflower petals, a large amount (about 20% to 30%) of the safflower yellow needs to be removed in the process of extracting the safflower red having a small content (about 0.3% to 0.6%), and the removal of the safflower yellow causes unnecessary waste.

Patent application document, application number: 201510335664.8, (invention name: medicinal plant dyeing dress with environmental protection function and manufacturing method) relates to the dyeing technology using gardenia, turmeric, radix scutellariae, coptis, sophora flower bud, cotinus coggygria and the like, and the hair dyeing technology using carthamin yellow pigment is not searched. This is probably because in the field of natural dyeing, the plant dyes dyed yellow are abundant, the extraction method is simple and convenient, and a high-temperature decocting method is mostly used. Although safflower yellow is also resistant to high temperature, the safflower yellow cannot be extracted by a high-temperature boiling method because the safflower red pigment and the safflower yellow are stored in safflower petals at the same time, and the safflower red pigment is rapidly decomposed at a temperature of more than 70 ℃.

The wool fiber has special morphological structure and performance, and the main component of the wool fiber is keratin which is formed by the condensation polymerization of a plurality of alpha-amino acids. The solid part is composed of cortex layer and hair marrow tissue medulla layer with opaque hair shaft center. The cortex layer is located in the scale layer and is the main component of the wool fiber and also the main component determining the physical, mechanical and chemical properties of the wool fiber. The cortex is divided into two types, namely a normal cortex and a accessory cortex, and the two types have different mechanical properties and dyeing properties. The normal cortex contains less sulfur than the accessory cortex, and has more active chemical properties and is easy to dye, while the accessory cortex is the opposite. The dried hair fiber is coated by a scale layer, and the scales are mostly corrugated or fish scale-shaped, are mutually overlapped and covered, are spread outwards and are protruded. Therefore, the wool fiber assembly is pressed and kneaded by an external force under a damp and hot condition, and is shrunk tightly to cause a felting phenomenon of mutual engagement and entanglement.

Wool fibers have unique felting properties that determine when they are dyed with little attention, felting occurs. Therefore, the hair dyeing process is unique and different from silk dyeing, cotton dyeing, hemp dyeing and the like. This is one of the main reasons why the dyeing of wool fibers with safflor yellow has not been seen at present. The safflower red pigment is rare and is precious natural red pigment, but if the safflower red pigment is extracted, a large amount of safflower yellow pigment must be removed. Therefore, the safflower yellow pigment which is bright in color and has good water solubility and thermal stability is collected and applied to the field of textile dyeing and finishing, so that the best use of the materials can be realized, the loss and waste of natural resources are avoided, and the sustainable development of the environment-friendly production of healthy natural dyed textiles can be effectively promoted.

Disclosure of Invention

Problems to be solved by the invention

In view of the technical problems in the prior art, for example: the invention aims to provide the safflower yellow and the preparation method thereof, the safflower yellow is extracted from natural plants, the preparation process of the safflower yellow is green and pollution-free, the preparation method is beneficial to environmental protection and health, and the safflower red is not damaged.

Furthermore, the invention also provides a dyeing method, and the dyeing process is safe, environment-friendly and easy to operate.

Means for solving the problems

The invention provides a preparation method of safflower yellow, which comprises the following steps: soaking Carthami flos in water, squeezing the Carthami flos, and collecting yellow pigment liquid, wherein the temperature of the water is below 50 deg.C.

The preparation method of the safflower yellow provided by the invention comprises the following steps:

step 1): soaking Carthami flos in water below 50 deg.C, squeezing, standing, and collecting primary yellow pigment liquid;

step 2): soaking the squeezed safflower obtained in the step 1) in water again, squeezing again, and collecting secondary yellow pigment liquid.

The preparation method of the safflower yellow provided by the invention is characterized in that in the step 1), the addition amount of water required by every 100g of safflower is 1-5L; the standing time is 0.5-5 h.

The preparation method of the safflower yellow provided by the invention is characterized in that in the step 2), the addition amount of water required by every 100g of safflower is 1-5L; the soaking time is 3-24 h.

The invention also provides a safflower yellow liquid which is prepared by the preparation method.

The invention also provides a dyeing method, which comprises the following steps:

preparing mordant liquid, wherein the mordant liquid comprises a mordant and an auxiliary agent;

immersing a sample to be dyed into a mordant dyeing solution for mordant dyeing to obtain a mordant dyeing sample;

dyeing the mordant dyeing sample by using safflower yellow liquid to obtain a dyed sample; wherein

The safflower yellow liquid is the safflower yellow liquid according to claim 5.

The dyeing method comprises the following steps that in the mordant liquid, the mass ratio of the auxiliary agent to the mordant is 1: 2-10; and/or the mass concentration of the mordant in the mordant liquid is 0.05-10 g/L.

According to the dyeing method, the using amount of the auxiliary agent is 0.5-5% and the using amount of the mordant is 5-20% of the total mass of the sample to be dyed; and/or the mordant comprises one or two of aluminum acetate and alum; the auxiliary agent comprises one or two of tartaric acid and tower powder.

According to the dyeing method, during mordant dyeing, the initial temperature of mordant dyeing liquid is 35-45 ℃, then the temperature is raised to 80-85 ℃, then the heating is stopped, and the temperature is naturally reduced to 35-45 ℃;

wherein the content of the first and second substances,

the heating is carried out at 6-10 ℃ every 10 min.

According to the dyeing method, during dyeing, the initial temperature of the safflower yellow liquid is 35-45 ℃, then the temperature is raised to 80-85 ℃, then the heating is stopped, and the temperature is naturally reduced to 35-45 ℃; wherein the content of the first and second substances,

the heating is carried out at 6-10 ℃ every 10 min.

ADVANTAGEOUS EFFECTS OF INVENTION

The safflower yellow of the invention can be extracted from safflower, and the preparation process of the safflower yellow is green and pollution-free, is beneficial to environmental protection and health, and does not damage the safflower red.

Furthermore, the safflower yellow of the invention is simple and convenient to operate, environment-friendly and harmless when being dyed; is especially suitable for dyeing wool fiber.

Drawings

Fig. 1 shows a flow chart of a method for preparing safflor yellow according to an embodiment of the present invention.

Fig. 2 shows a flow chart of a dyeing method according to another embodiment of the present invention.

Detailed Description

Various exemplary embodiments, features and aspects of the invention will be described in detail below. The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In other instances, methods, means, devices and steps which are well known to those skilled in the art have not been described in detail so as not to obscure the invention.

All units used in the present invention are international standard units unless otherwise stated, and numerical values and numerical ranges appearing in the present invention should be understood to include errors allowed in industrial production.

As used herein, "water" includes any feasible water such as tap water, deionized water, distilled water, double distilled water, purified water, ion-exchanged water, and the like.

First aspect

The inventors of the present invention found that safflower yellow has excellent water solubility, whereas safflower red is insoluble in water. Thus, the safflower yellow can be dissolved in water to obtain safflower yellow. Specifically, the first aspect of the present invention provides a method for preparing safflower yellow, which comprises the following steps: soaking Carthami flos in water, squeezing the Carthami flos, and collecting yellow pigment liquid, wherein the temperature of the water is below 50 deg.C.

Specifically, in the invention, the preparation method of the safflower yellow comprises the following steps:

step 2): soaking the extruded safflower obtained in the step 1) in water again, extruding again, and collecting secondary yellow pigment liquid; and mixing the primary yellow pigment liquid and the secondary yellow pigment liquid for later use.

Further, in the step 1), the addition amount of water required by each 100g of safflower is 1-6L, preferably 3-5L, for example: 1.5L, 2L, 2.5L, 3L, 3.5L, 4L, 4.5L, 5.5L, etc.; the standing time is 0.5-5 h, preferably 1-3 h, for example: 1h, 1.5h, 2h, 2.5h, 3h, 3.5h, 4h, 4.5h and the like. In the step 2), the addition amount of water required by each 100g of safflower is 1-6L, preferably 3-5L, for example: 1.5L, 2L, 2.5L, 3L, 3.5L, 4L, 4.5L, 5.5L, etc.; the soaking time is 3-24 h, preferably 6-18 h, for example: 4h, 6h, 8h, 10h, 12h, 15h, 18h, 20h, 22h and the like.

The mode of extrusion is not particularly limited in the present invention, and the extrusion may be carried out with a tool, for example, cotton cloth, or the like, or may be carried out by rubbing with hands. The method for collecting the primary yellow pigment liquid and the secondary yellow pigment liquid is not particularly limited in the present invention, and any conventional method such as centrifugation and filtration may be used, and filtration is preferably used, and filtration using cotton cloth may be used to reduce the loss of safflower yellow during filtration.

Preferably, in the present invention, the preparation method of safflower yellow comprises the following steps:

1. soaking Carthami flos in water in a container, kneading with hand, and standing.

2. Filtering with cotton cloth, and collecting yellow pigment liquid.

3. And (4) putting the filtered safflower into a container, injecting water, and uniformly stirring and soaking.

4. Filtering, wrapping petals in cotton cloth, wringing to obtain juice, and collecting secondary yellow pigment liquid.

5. Mixing the yellow pigment liquid obtained in the two times for later use.

The first aspect of the present invention also provides a safflower yellow liquid which is obtained by the above-mentioned production method of the present invention.

Second aspect of the invention

A second aspect of the present invention provides a dyeing method comprising the steps of:

and dyeing the mordant sample by using a safflower yellow liquid to obtain a dyed sample.

The dyeing process of the invention is also safe, environment-friendly and easy to operate, and is particularly suitable for dyeing wool fibers. The dyeing method of the invention is particularly suitable for the wool dyeing process.

The inventor finds that the wool fiber begins to absorb water and swell in the liquid at about 40 ℃, the strength is obviously reduced, and the best time for starting dyeing is provided. Meanwhile, the heat resistance of the wool fiber is poor, the wool fiber begins to turn yellow and harden due to the evaporation of water in the fiber in dry heat of 100-105 ℃, and begins to decompose when the temperature is raised to 120-130 ℃. Accordingly, a suitable dyeing temperature for wool fibers is 40 ℃ to 85 ℃. Pigment is not easy to dye when the temperature is too low, and hair fiber is damaged when the temperature is too high. Aiming at the particularity of wool fiber, the specific dyeing process comprises the following steps:

< pretreatment >

In the present invention, a sample to be dyed needs to be pretreated. The pretreatment includes but is not limited to degreasing, impurity removal, bleaching and other procedures. After the sample to be dyed is degreased, decontaminated, bleached and the like, the sample is usually fully soaked by water added with neutral detergent before dyeing, and then washed and drained. When washing, the washing machine can be used for kneading or wringing so as to avoid felting.

By neutral detergent is meant a detergent having a pH in the range of 6-8 at standard use concentrations at 25 ℃. For example: conventional laundry detergents and the like.

The time for soaking is not particularly limited in the present invention, and may be a time generally used in the art, for example: 10-60 min, etc. The number of washing and the temperature of washing are not particularly limited in the present invention, but washing is generally carried out 2 to 4 times, and the temperature of washing may be 35 to 45 ℃.

Specifically, the pretreatment process comprises the following steps:

1. adding 6-10 mL of neutral detergent into 5-7L of water, and uniformly stirring to prepare a pretreatment solution, wherein the temperature of the water is 35-50 ℃.

2. Firstly, putting a sample to be dyed into a metal mesh basin, and then soaking the sample to be dyed into the pretreatment liquid for 20-30 min.

3. And taking the metal mesh basin and the sample to be dyed out of the pretreatment liquid, draining the liquid, and slightly rinsing the metal mesh basin in warm water at 35-50 ℃ for 2-4 times. The kneading or twisting can not be carried out during the kneading or twisting process, so as to avoid the felting phenomenon.

4. Suspending the sample to be dyed in a metal mesh basin, standing, and draining water.

< mordant dyeing >

The safflower yellow can be used as mordant dye, and the wool fiber can be dyed with bright color through mordant dyeing and after dyeing. The initial temperature for mordanting wool fibers is around 40 ℃. In order to prevent the wool fiber from being dissolved due to the overhigh temperature of the dye liquor, the maximum temperature of mordant dyeing is controlled to be about 85 ℃. The mordant dyeing of wool fiber has the best effect at about 80 ℃, but because mordant dyeing liquid is easy to generate precipitation when meeting high temperature, the stability is increased by adding the auxiliary agent, and the precipitation can be effectively avoided.

In the present invention, mordant dyeing is performed by preparing a mordant liquid. The mordant comprises a mordant and an auxiliary agent. Specifically, a sample to be mordant is immersed in a mordant liquid for mordant dyeing, so as to obtain a mordant dyeing sample. In the mordant liquid, the mass ratio of the auxiliary agent to the mordant is 1: 2-10, for example: 1:4, 1:6, 1:8, etc.; and/or the mass concentration of the mordant in the mordant liquid is 0.05-10g/L, such as 1g/L, 3g/L, 5g/L, 7g/L, 9g/L and the like.

In some specific embodiments, the amount of the auxiliary agent is 0.5-5% and the amount of the mordant is 5-20% based on the total mass of the sample to be dyed, and when the amount of the auxiliary agent is 0.5-5% and the amount of the mordant is 5-20%, the mordant effect can be exerted most effectively. Further, the mordant comprises one or two of aluminum acetate and alum; the auxiliary agent comprises one or two of tartaric acid or tower powder. Wherein the tower powder is generally byproduct potassium hydrogen tartrate in brewing wine, and is a food additive.

The mordant conditions are not particularly limited in the present invention, and considering the mordant effect and the late dyeing effect, the initial temperature of the mordant liquid is 35 ℃ to 45 ℃ during mordant dyeing, for example: 38 ℃, 40 ℃, 42 ℃ and the like, then heating to 80-85 ℃, stopping heating, and naturally cooling to 35-45 ℃, for example: 38 ℃, 40 ℃, 42 ℃ and the like; wherein the heating is performed by heating to 6-10 ℃ every 10min, for example: 7 ℃, 8 ℃, 9 ℃ and the like.

Particularly, when mordant dyeing is carried out, a sample to be dyed can be properly turned over so as to ensure that the coloring is more uniform. Further, after mordant dyeing is finished, the sample can be put into a device capable of leaking water or is gently dehydrated by a dehydrator, and then rinsed for 2-4 times in warm water at 35-45 ℃ and drained to obtain a final mordant dyeing sample.

Preferably, the mordant dyeing comprises the following steps:

1. adding an auxiliary agent into warm water at 35-45 ℃, and heating until the auxiliary agent is completely dissolved.

2. And adding the mordant into the auxiliary agent liquid, and heating until the mordant is completely dissolved.

3. And pouring the mixed liquid of the auxiliary agent and the mordant into water to prepare mordant liquid.

4. Heating the mordant liquid to 35-45 ℃, immersing the wool fibers in the mordant liquid, slightly stirring, and heating with slow fire.

5. The dye liquor temperature is measured every 10min, and the temperature is increased by 6-10 ℃ every 10 min.

6. And turning over the wool fibers for 2-4 times during heating to ensure that the wool fibers are uniformly colored. When the temperature rises to 80-85 ℃, the fire is turned off, and the cover is covered to naturally cool to 35-45 ℃.

7. Putting the sample to be dyed into a water-leaking device of a metal mesh basin, rinsing the sample in warm water at 35-50 ℃ for 2-4 times, and draining (or softly dewatering for 0.1-2min by using a dewatering machine).

< dyeing >

In the invention, the mordant sample is dyed by using safflower yellow liquid to obtain a dyed sample. Particularly, in the dyeing process, the initial temperature for dyeing the wool fibers can be 35-45 ℃. In order to prevent the wool fiber from being dissolved due to the overhigh temperature of the dye liquor, the highest dyeing temperature is controlled to be 80-85 ℃. Specifically, during the dyeing, the initial temperature of the safflower yellow liquid is 35 ℃ to 45 ℃, for example: 38 ℃, 40 ℃, 42 ℃ and the like, then heating to 80-85 ℃, stopping heating, and naturally cooling to 35-45 ℃, for example: 38 ℃, 40 ℃, 42 ℃ and the like; wherein the heating is performed by heating to 6-10 ℃ every 10min, for example: 7 ℃, 8 ℃, 9 ℃ and the like.

During dyeing, the safflower yellow liquid can be heated to boiling, and then cooled to the dyeing initial temperature of 35-45 ℃ after filtering, for example: 38 ℃, 40 ℃, 42 ℃ and the like, because the wool fiber begins to absorb water and expand at 35-45 ℃ and the strength begins to decrease, which is suitable for starting dyeing, the temperature of 35-45 ℃ is the initial temperature for dyeing the wool fiber.

Particularly, when dyeing is carried out, the mordant sample can be properly turned over so as to ensure that the coloring is more uniform. Further, after dyeing is finished, the sample can be placed in a device capable of leaking water or is gently dehydrated by a dehydrator, and then rinsed for 2-4 times in warm water at 35-45 ℃ and drained, so that a final mordant dyeing sample is obtained.

Specifically, the dyeing step comprises:

1. heating the safflower yellow liquid to boil, and filtering with cotton cloth.

2. Cooling the safflower yellow liquid to 35-45 ℃.

3. Firstly, putting the wool fibers into a metal mesh basin, then immersing the wool fibers into dye liquor at 35-45 ℃, slightly stirring, covering and heating with slow fire.

4. The dye liquor temperature is measured every 10min, and the temperature is increased by 6-10 ℃ every 10 min.

5. And turning over the wool fibers for 2-4 times during heating to ensure that the wool fibers are uniformly colored. When the temperature rises to 80-85 ℃, the fire is turned off, and the cover is covered to naturally cool to 35-45 ℃.

6. Putting the sample to be dyed into a water-leaking device of a metal mesh basin, rinsing the sample in warm water at 35-50 ℃ for 2-4 times, and draining (or softly dewatering for 0.1-2min by using a dewatering machine).

7. Ventilating and drying in the shade.

In the invention, the safflower belongs to renewable resources, the sources of plant raw materials are rich, and the safflower yellow pigment extracted from the safflower is used for dyeing the wool fiber, so that a large amount of yellow pigment generated in the process of extracting the safflower red pigment can be fully utilized, and the utilization rate of the safflower raw material is greatly improved. The method has the advantages of obvious advantages, simple and convenient operation, no organic solvent residue, environmental protection and no harm.

Aiming at the particularity of the wool fiber, the mordant dyeing and dyeing temperature is determined to be 40-85 ℃, the wool fiber is not damaged, and the optimal dyeing effect is obtained. The method of raising the temperature to 6-10 ℃ every 10min in the mordant dyeing process and naturally lowering the temperature to 35-45 ℃ after the process is finished effectively avoids felting of wool fibers caused by sudden temperature change in the mordant dyeing process or the dyeing process. In addition, a method suitable for the characteristics of wool fibers is adopted, and the wool fibers are subjected to mordant dyeing and then dyeing, so that the wool fibers have pure and bright color effects.

The dyeing process disclosed by the invention is low-carbon, environment-friendly and pollution-free, conforms to the green production concept of contemporary textiles, and is beneficial to meeting the living needs of people.

Examples

Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.

Example 1

Example 1 and application example 1 the following raw materials by weight were used: 50g of bleached sheep wool, 200g of dried safflower, 6g of alum and 1g of tara powder.

Extracting safflower yellow

1. Soaking Carthami flos in 6L water, kneading with hand, and standing for 2 hr.

2. Filtering with cotton cloth, and collecting yellow pigment liquid.

3. Placing the filtered Carthami flos in a container, adding 6L water, stirring, and soaking for 12 hr.

5. Mixing the yellow pigment liquid obtained in the two times for later use.

Application example 1

First, pretreatment

1. 6mL of laundry detergent is added into a container containing 6L of warm water at 40 ℃, and the laundry detergent is uniformly stirred to prepare a pretreatment liquid.

2. Firstly, sheep wool is put into a metal mesh basin, and then the sheep wool and the metal mesh basin are immersed into pretreatment liquid for 30 min.

3. The metal mesh basin and the sheep wool are taken out of the pretreatment liquid together, and after the liquid is drained, the metal mesh basin and the sheep wool are put into warm water at 40 ℃ for gentle rinsing for 3 times. The kneading or twisting can not be carried out during the kneading or twisting process, so as to avoid the felting phenomenon.

4. The sheep wool is suspended and kept stand in a metal mesh basin, and the water is drained.

II, mordant dyeing

1.1 g (2% of sheep wool weight) of tower powder was added to a 1.25L container of warm water at 40 ℃ and heated until the tower powder was completely dissolved to obtain a tower powder liquid.

2. 6g (12% of sheep wool weight) of alum was added to the above Tata powder liquid and heated until the alum was completely dissolved.

3. Pouring the mixture of the tower powder and the alum into a container containing 12L of water to prepare mordant liquid.

4. The mordant liquid is heated to about 40 ℃, the sheep wool is immersed in the mordant liquid, slightly stirred and covered by a cover and heated by slow fire.

5. The dye liquor temperature was measured every 10min and increased by 6 ℃ every 10 min.

6. The sheep wool is turned over 3 times during heating to make the color of the sheep wool uniform. When the temperature rises to 80 ℃, the fire is turned off, and the cover is covered to naturally cool to about 40 ℃.

7. Placing sheep wool into a metal mesh basin capable of leaking water, rinsing in warm water at about 40 deg.C for 3 times, and draining.

Third, dyeing

1. Heating the safflower yellow liquid to boil in a container, and filtering with cotton cloth.

2. Cooling the liquid of safflower yellow to about 40 ℃.

3. Placing sheep wool into metal mesh basin, soaking in safflower yellow liquid at 40 deg.C, stirring, covering, and heating with slow fire.

4. Measuring liquid temperature of safflower yellow once every 10min, preferably raising temperature to 6 deg.C every 10 min.

5. The sheep wool is turned over 3 times during heating to make the color of the sheep wool uniform. When the temperature rises to 80 ℃, the fire is turned off, and the cover is covered to naturally cool to about 40 ℃.

6. Placing sheep wool into water-leaking container such as metal mesh basin, rinsing in warm water at about 40 deg.C for 3 times, and draining.

7. And (5) ventilating and drying in the shade to obtain a dyed product.

Example 2

Example 2 and application example 2 the following raw materials by weight were used: 50g of bleached mohair, 400g of dried safflower, 6g of alum and 1g of tara powder.

Extracting safflower yellow

1. Soaking Carthami flos in 5.5L water, kneading with hand, and standing for 1.5 hr.

2. Filtering with cotton cloth, and collecting yellow pigment liquid.

3. Placing Carthami flos in a container, adding 5.5L water, stirring, and soaking for 13 hr.

5. Mixing the yellow pigment liquid obtained in the two times for later use.

Application example 2

First, pretreatment

1. 7.5mL of a common laundry detergent was added to a container containing 5.5L of warm water at 40 ℃ and stirred uniformly to prepare a pretreatment liquid.

2. The mohair is firstly put into a metal mesh basin and then is soaked in the pretreatment liquid for 35 min.

3. Taking out the metal mesh basin and the mohair from the pretreatment liquid, draining the liquid, and gently rinsing in warm water at 40 ℃ for 4 times. The kneading or twisting can not be carried out during the kneading or twisting process, so as to avoid the felting phenomenon.

4. Suspending the mohair in a metal mesh basin, standing, and draining water.

II, mordant dyeing

1. Adding 1g (2% of weight of mohair) tower powder into a container containing 1.3L of warm water of 40 deg.C, and heating until the tower powder is completely dissolved to obtain tower powder liquid.

2. 6g (12% of the weight of the mohair) of alum was added to the above liquid tower powder and heated until the alum was completely dissolved.

3. Pouring the mixture of the tower powder and the alum into a container containing 11.5L of water to prepare mordant liquid.

4. Heating the mordant liquid to about 40 ℃, immersing the mohair into the mordant liquid, slightly stirring, covering and heating with slow fire.

5. The dye liquor temperature was measured every 10min and increased to 6 ℃ every 10 min.

6. Turning over the mohair for 4 times during heating to make the color of the mohair uniform. When the temperature rises to 80 ℃, the fire is turned off, and the cover is covered to naturally cool to about 40 ℃.

7. Putting the mohair into water-leaking device such as metal mesh basin, rinsing in warm water of about 40 deg.C for 4 times, and dewatering with dewatering machine for 0.5 min.

Third, dyeing

2. Cooling the liquid of safflower yellow to about 40 ℃.

3. Firstly, the mohair is put into a metal mesh basin, then the mohair and the metal mesh basin are immersed into safflower yellow liquid at the temperature of about 40 ℃, and the mahair is covered with a cover and heated by slow fire after being gently stirred.

4. The liquid temperature of safflower yellow was measured every 10min and was raised to 6 ℃ every 10 min.

5. Turning over the mohair for 4 times during heating to make the color of the mohair uniform. When the temperature rises to 80 ℃, the fire is turned off, and the cover is covered to naturally cool to about 40 ℃.

6. Putting the mohair into a water-leaking device such as a metal mesh basin, rinsing the mohair in warm water at about 40 ℃ for 3-4 times, and then softly dehydrating the mohair for 0.5min by using a dehydrator.

7. And (5) ventilating and drying in the shade to obtain a dyed product.

Performance testing

1. Colour fastness to rubbing

The dyeings of application example 1 and application example 2 were tested for crockfastness using a Y571D crockfastness tester (Wenzhou Square instruments Co., Ltd.) according to GB/T5712-1997, the results of which are shown in Table 1 below:

TABLE 1

	Dry friction	Wet friction
			Application example 1	4-5 stages	Grade 3-4
Application example 2	4-5 stages	Grade 3-4

2. Color fastness to washing

The dyed articles of application example 1 and application example 2 were subjected to soaping fastness test using an SW-12B washfastness tester (Wenzhou Square Instrument Co., Ltd.) in accordance with GB/T3921.1-5, and the test results were as follows:

TABLE 2

	Soaping
		Application example 1	Grade 3-4
Application example 2	Grade 3-4

As can be seen from tables 1 and 2, the dyed products dyed by the dyeing method of the invention have excellent rubbing color fastness and soaping color fastness, bright and appropriate color, obvious advantages of the dyeing method, simple operation, no organic solvent residue, environmental protection and no harm.

The above examples of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A dyeing method, characterized by comprising the steps of:

preparing mordant liquid, wherein the mordant liquid comprises a mordant and an auxiliary agent, and the auxiliary agent comprises one or two of tartaric acid and tower powder;

immersing a sample to be dyed into a mordant dyeing solution for mordant dyeing to obtain a mordant dyeing sample; wherein the content of the first and second substances,

the initial temperature of the mordant dyeing liquid is 35-45 ℃, then the mordant dyeing liquid is heated to 80-85 ℃, and then the heating is stopped, and the mordant dyeing liquid is naturally cooled to 35-45 ℃;

The safflower yellow liquid is prepared by a preparation method of the safflower yellow, and the preparation method of the safflower yellow comprises the following steps: soaking Carthami flos in water, squeezing the Carthami flos, and collecting yellow pigment liquid, wherein the temperature of the water is below 50 deg.C.

2. The dyeing method according to claim 1, characterized in that the preparation method of safflower yellow comprises the following steps:

3. The dyeing method according to claim 2, characterized in that in the step 1), the addition amount of water required by each 100g of safflower is 1-5L; the standing time is 0.5-5 h.

4. The dyeing method according to claim 2 or 3, characterized in that in the step 2), the addition amount of water required by each 100g of safflower is 1-5L; the soaking time is 3-24 h.

5. The dyeing method according to any one of claims 1 to 3, characterized in that the mass ratio of the auxiliary agent to the mordant in the mordant liquid is 1: 2-10; and/or the mass concentration of the mordant in the mordant liquid is 0.05-10 g/L.

6. The dyeing method according to any one of claims 1 to 3, characterized in that the auxiliary is used in an amount of 0.5 to 5% and the mordant is used in an amount of 5 to 20% based on the total mass of the sample to be dyed; and/or the mordant comprises one or two of aluminum acetate and alum.

7. The dyeing method according to any one of claims 1 to 3, characterized in that, in the mordant dyeing, the temperature rise heating is 6 ℃ to 10 ℃ every 10 min.

8. The dyeing method according to any one of claims 1 to 3, characterized in that, during the dyeing, the initial temperature of the safflower yellow liquid is 35 ℃ to 45 ℃, then the temperature is raised to 80 ℃ to 85 ℃, then the heating is stopped, and the temperature is naturally reduced to 35 ℃ to 45 ℃; wherein the content of the first and second substances,

the heating is carried out at 6-10 ℃ every 10 min.