CN113825872A

CN113825872A - Functional cashmere fiber and preparation method thereof

Info

Publication number: CN113825872A
Application number: CN201980096280.1A
Authority: CN
Inventors: 戴炜烈; 王凌云; 刘凤林; Y·伊姆豪珍
Original assignee: Rola Fasda Co ltd
Current assignee: Rola Fasda Co ltd
Priority date: 2019-06-04
Filing date: 2019-06-04
Publication date: 2021-12-21
Also published as: EP3980594A4; EP3980594A1; WO2020243889A1; US20220325466A1

Abstract

The present disclosure provides a functional cashmere fiber, including cashmere fiber, boron-doped TiO₂A layer and a carboxymethyl cellulose (CMC) binder. CMC binder to boron-doped TiO₂The layer is bonded on cashmere fiber to make boron-doped TiO₂The layer at least partially covers the cashmere fibres. The functional cashmere fiber has a self-cleaning function under visible light conditions and has high washing stability.

Description

Functional cashmere fiber and preparation method thereof

Technical Field

The present disclosure relates to textiles, and more particularly, to functional cashmere fibers and a method of preparing the same.

Background

Many textiles on the market employ surface dye repellency methods such as structural modification (e.g., plasma treatment) or chemical modification (e.g., surface fluorination) to maintain stain free. However, these products do not have a self-cleaning function, and their surface properties deteriorate with time. Self-cleaning materials have therefore received attention in the textile industry.

Self-cleaning textiles can be obtained by treating the textiles with a fluorine-containing finish. However, fluorine is well known to be a highly toxic element.

By using titanium dioxide (TiO)₂) Coating textile fibers or yarns to capture UV light for self-cleaning may enable functionalization of textile fibers or yarns. However, due to TiO₂Has a wide photonic band gap (3.2eV) and the rapid recombination of the generated electron-hole pairs, and its application is limited. Furthermore, TiO₂The coated fibers are suitable only for uv irradiation.

There is therefore a need for a textile product that eliminates or at least reduces the above-mentioned disadvantages and problems.

Disclosure of Invention

The invention provides a functional cashmere fiber, which comprises cashmere fiber; comprising boron-doped titanium dioxide (TiO)₂) A layer of (a); and a binder comprising carboxymethyl cellulose (CMC) for binding the layer to the cashmere fibres such that the layer at least partially covers the cashmere fibres.

In certain embodiments, the boron-doped TiO₂Is between 0.3:1 and 1.2: 1.

In certain embodiments, the layer has a thickness between 10nm and 100 nm.

In some embodiments, the layer completely covers the cashmere fibres.

In some embodiments, the cashmere fibres have a diameter of between 5 μm and 30 μm.

In certain embodiments, the boron-doped TiO₂Is between 0.9:1 and 1.1:1, and the thickness of the layer is between 10nm and 50 nm.

The invention provides a functional yarn containing the functional cashmere fiber. In certain embodiments, the functional yarn has 2/27 yarns.

The invention provides a functional fabric containing the functional cashmere fiber.

The invention provides a method for preparing the functional cashmere fiber. The method comprises providing CMC coated fibers, wherein the CMC coated fibers are CMC coated cashmere fibers; and mixing the CMC coated fibers with boron-doped TiO₂Contacting, thereby forming functional fibers.

In certain embodiments, the boron-doped TiO₂In a molar ratio of boron to titanium of between 0.3:1 and 1.2: 1.

In certain embodiments, the method further comprises contacting the cashmere fibers with a first solution comprising CMC, thereby forming CMC coated fibers.

In certain embodiments, the first solution is a CMC sodium salt solution.

In certain embodiments, the first solution has a CMC concentration between 0.1% (v/v) and 1% (v/v).

In certain embodiments, CMC coated fibers are mixed with boron doped TiO₂The step of contacting comprises: CMC coated fibers and articles comprising boron doped TiO₂Or TiO doped with boron₂A second solution of the precursor, thereby forming the boron-doped TiO₂-CMC coated fibers; and solidifying the boron-doped TiO₂-CMC coated fibers, thereby forming functional fibers.

In certain embodiments, the boron-doped TiO₂The precursor comprises TiO₂A precursor, a boron precursor, and an acidic aqueous solution.

In certain embodiments, the TiO is₂The precursor is titanium alkoxide or titanium tetrachloride, the boron precursor is trialkyl borate or boric acid, and the acidic aqueous solution is acetic acid, nitric acid or hydrochloric acid.

In certain embodiments, the curing step comprises curing the boron-doped TiO at a temperature between 90 ℃ and 150 ℃₂-CMC coated fibers.

In certain embodiments, the method comprises contacting cashmere fibres with a first solution comprising CMC, wherein the first solution is a CMC sodium salt solution having a CMC concentration between 0.4% (v/v) and 0.6% (v/v), thereby forming CMC coated fibres; CMC coated fibers and articles comprising boron doped TiO₂Or TiO doped with boron₂A second solution of the precursor, thereby forming the boron-doped TiO₂CMC coated fibers with boron-doped TiO₂In a molar ratio of boron to titanium of between 0.9:1 and 1.1: 1; and curing the boron-doped TiO at a temperature between 110 and 130₂-CMC coated fibers, thereby forming functional cashmere fibers.

The invention provides a method for preparing functional cashmere yarns, which comprises the following steps: providing a CMC coated yarn, wherein the CMC coated yarn is a CMC coated cashmere yarn; coating CMC on the yarn with a solution containing boron-doped TiO₂Or TiO doped with boron₂A second solution of the precursor, thereby forming the boron-doped TiO₂-a CMC coated yarn; and solidifying the boron-doped TiO₂-CMC coated yarn, thereby forming a functional cashmere yarn.

The invention provides a method for preparing a functional cashmere fabric, which comprises the following steps: providing a CMC coated fabric, wherein the CMC coated fabric is a CMC coated cashmere fabric; coating CMC with a composition comprising boron-doped TiO₂Or TiO doped with boron₂A second solution of the precursor, thereby forming the boron-doped TiO₂-a CMC coated fabric; and solidifying the boron-doped TiO₂-a CMC coated fabric, thereby forming a functional cashmere fabric.

These and other aspects, features and advantages of the present disclosure will become more fully apparent from the following description of the drawings, the accompanying drawings, the detailed description of certain embodiments and the appended claims.

Drawings

The accompanying drawings contain figures of certain embodiments to further illustrate and clarify the above and other aspects, advantages and features of the present invention. It is to be understood that these drawings depict embodiments of the invention and are not intended to limit the scope of the invention. The invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:

FIG. 1 is a schematic diagram depicting a cross-section of functional cashmere fibres according to some embodiments;

fig. 2 is a flow diagram depicting a method for preparing functional cashmere fibers according to some embodiments;

fig. 3 is a flow chart depicting a method for preparing functional cashmere fibers according to some embodiments;

FIG. 4 is the Methyl Orange (MO) degradation test results of functional cashmere sweaters made using TO, BO, TB1 and TB2 formulations;

FIG. 5 shows the results of Methyl Orange (MO) degradation tests of functional cashmere sweaters made using TB 2;

FIG. 6 is the results of a wash stability test of functional cashmere sweaters prepared with different concentrations of TB 2;

fig. 7 shows the MO degradation test results of different soaking times before washing for functional cashmere yarns prepared using TB 2;

fig. 8 is MO degradation test results of functional cashmere yarn prepared using TB2 at different soaking times after washing;

fig. 9 is the results of a red wine removal test of the original cashmere fabric and the functional cashmere fabric prepared with TB 2;

fig. 10 is the coffee removal test results of the original cashmere fabric and the functional cashmere fabric prepared with TB 2;

fig. 11A is a Scanning Electron Microscope (SEM) image of an original cashmere fabric;

fig. 11B is an SEM image of a functional cashmere textile prepared with TB 2; and

fig. 12 is an X-ray diffraction (XRD) spectrum of the original cashmere fiber and the functional cashmere fiber prepared with TO.

Detailed Description

The invention provides a functional cashmere fiber, which comprises cashmere fiber and boron-doped TiO₂And a binder comprising CMC.The adhesive bonds the layer to the cashmere fibres such that the layer at least partially covers the cashmere fibres. The functional cashmere fiber has a self-cleaning function and high washing stability under visible light.

Fig. 1 is a schematic diagram depicting a cross-section of functional cashmere fibres according to some embodiments. The functional cashmere fiber 10 comprises cashmere fiber 11 and boron-doped TiO₂Layer 12 and CMC binder 13. The CMC binder 13 is to be doped with boron TiO₂The layer 12 is bonded to the cashmere fibres 11 so that the boron-doped TiO₂A layer 12 covering the cashmere fibres 11 and a CMC binder 13 at least partially located between the cashmere fibres 11 and the boron-doped TiO₂Between the layers 12. Boron-doped TiO₂The layer 12 is photocatalytic and removes contaminants attached thereto by a photocatalytic reaction under visible light, thereby achieving a self-cleaning function. CMC binder 13 boron-doped TiO₂The layer 14 is tightly bonded to the cashmere fibers 11 to improve the washing stability of the functional cashmere fibers 10.

In certain embodiments, the cashmere fibres are fibres obtained from cashmere goats or similar materials.

In some embodiments, the diameter of the cashmere fibres is between 5 μm and 30 μm, between 10 μm and 25 μm, or between 10 μm and 20 μm.

In certain embodiments, the boron-doped TiO₂The layer is partially covered with cashmere fibers.

In certain embodiments, the boron-doped TiO₂The layer completely covers the cashmere fibres.

In certain embodiments, the boron-doped TiO₂The layer comprising boron-doped TiO₂And (3) granules. Boron-doped TiO₂The particles have a size between 10nm and 50nm, between 20nm and 40nm, or between 25nm and 35 nm.

In certain embodiments, the boron-doped TiO₂The thickness of the layer is between 10nm and 100nm, between 30nm and 80nm, or between 50nm and 60 nm.

In certain embodiments, the boron-doped TiO₂The layer has a boron to titanium molar ratio between 0.3:1 and 1.2:1, between 0.5:1 and 1:1, or between 0.9:1 and 1.1: 1.

The functional cashmere fiber provided by the invention can be used for manufacturing different functional textiles, such as yarns, fabrics or clothes. The functional textile containing the functional cashmere fiber has a self-cleaning function and high washing stability. In certain embodiments, the functional cashmere yarn comprises interlocking functional cashmere fibers according to the present invention.

Fig. 2 is a flow diagram depicting a method of making functional cashmere fibers according to some embodiments. In step S21, CMC coated fibers are provided. The CMC coated fiber is a cashmere fiber coated with CMC. In step S22, the CMC coated fiber is mixed with the boron-doped TiO₂Contacting, thereby forming functional fibers.

Fig. 3 is a flow chart depicting a method of making functional cashmere fibers according to some embodiments. In step S31, the cashmere fibers are contacted with a CMC solution, thereby forming CMC-coated fibers. In step S32, the CMC coated fiber is mixed with the boron-doped TiO₂Solution contact to form boron-doped TiO₂CMC coated fibers coated with boron-doped TiO₂And CMC. In step S33, the boron-doped TiO is cured₂-CMC coated fibers, thereby forming functional fibers.

In certain embodiments, the boron-doped TiO₂The layer has a boron to titanium molar ratio between 0.3:1 and 1.2:1, between 0.5:1 and 1.2:1, or between 0.9:1 and 1.1: 1.

In certain embodiments, the CMC solution is a CMC sodium salt solution.

In certain embodiments, the CMC solution has a CMC concentration of between 0.1% and 1.0% (v/v), between 0.3% and 0.8% (v/v), or between 0.4% and 0.6% (v/v).

In certain embodiments, the boron-doped TiO₂The solution contains boron-doped TiO₂Or TiO doped with boron₂A precursor.

In certain embodiments, the boron-doped TiO₂The precursor comprises TiO₂A precursor, a boron precursor, and an acidic aqueous solution. The TiO is₂The precursor may be titanium tetraisopropoxide or titanium tetrachloride. The boron precursor may be a trialkyl borate or boric acid. The acidic aqueous solution may be acetic acid, nitric acid or hydrochloric acid. The boron-doped TiO₂The solution may contain titanium tetraisopropoxide at a concentration of between 2% and 30% (v/v), between 2% and 10% (v/v), or between 2% and 5% (v/v).

In certain embodiments, the boron-doped TiO₂-the CMC coated fibres are cured at a temperature between 90 and 150, between 100 and 140, or between 110 and 130 to stabilize the boron-doped TiO on the cashmere fibres₂。

Example 1: boron-doped TiO₂Preparation of the solution

Boron-doped TiO₂The preparation method of the solution is as follows: adding a first mixture of acetic acid and titanium tetraisopropoxide to tributylborate to form a second mixture, adding water to the second mixture to form a third mixture, and heating the third mixture to 60 deg.f for 2hr with stirring to form a mixture comprising boron-doped TiO₂Boron-doped TiO particles₂And (3) solution. Three solution formulations of TO, TB1 and TB2 were prepared as shown in table 1. TO (control sample) contains TiO only₂TB1 contained boron-doped TiO with a molar ratio of B to Ti of 0.5:1₂And TB2 comprises boron-doped TiO with a molar ratio of B to Ti of 1:1₂. TO for TiO formation₂Layers, TB1 and TB2, were used to form boron-doped TiO with different molar ratios₂And (3) a layer.

TABLE 1

Example 2: preparation of functional cashmere sweater

Step 1: the white cashmere sweater was washed with a nonionic detergent for 6min at 40 f using a tumble dryer. After drying, the cashmere sweater was immersed in a 0.5% (v/v) CMC sodium salt solution in a washing machine for 5min to form a CMC coated sweater. The CMC coated shirt was then rinsed with water.

Step 2: immersing the CMC-coated cashmere sweater in a washing machine and doping boron and TiO₂The solution is dissolved for 5min to form boron-doped TiO₂-CMC coated shirts. The boron-doped TiO was then dried at 60 deg.C₂CMC-coated shirts and cured at 120 ℃ for 3min in order to coat the shirts with boron-doped TiO₂And layering to form the functional shirt. Washing functional shirt with waterAnd then dried.

Example 3: preparation of functional cashmere yarn

Step 1: the white cashmere yarn was washed with a non-ionic detergent for 30min at 40 deg.f. After drying, the cashmere yarn was placed in a proofing machine containing 0.5% (v/v) CMC sodium salt solution at 25 ℃ for 3min to form a CMC coated yarn. The CMC coated yarn was then washed with water.

Step 2: placing the CMC coated yarn at 25 deg.C below a yarn containing boron-doped TiO₂In a proof press of the solution to form boron-doped TiO₂-a CMC coated yarn. Then, the boron-doped TiO is removed by using a centrifuge₂-excess solution on the CMC coated yarn. Subsequently, the boron-doped TiO was dried at 60 deg.C₂CMC coated yarn and cured at 120 ℃ for 3min, in order to coat the yarn with boron-doped TiO₂Layer to form a functional cashmere yarn. And washing the functional cashmere yarn with water and drying.

And step 3: the functional cashmere yarn is further treated by spraying water and waxing. The treated yarn is then woven into a cloth-like pattern.

Example 4: methyl Orange (MO) degradation test

The MO degradation test was performed in a test box equipped with a fluorescent lamp and an oscillator under the following conditions:

fabric size: 2 x 2cm²

-MO solution: 15.3. mu.M

-visible light intensity: 8mW/cm²

-uv light intensity: 84.9. mu.W/cm²

The functional cashmere textile and the control sample according to the present invention were immersed in a container containing 25mL MO (15.3 μ M) solution. The container was placed on a shaker and exposed to a light source. The original MO liquid was also exposed to light under the same conditions. At given time intervals, 2mL of MO was collected. The change in the MO concentration was measured by UV-Vis spectrophotometer at 464 nm.

Example 5: wash stability test

The samples were washed 5 times to test their wash stability. The test was carried out according to AATCC-143 test method.

The experimental conditions are as follows:

-nonionic detergent (2g/L)

400rpm, 30min, room temperature

Fig. 4 shows the results of Methyl Orange (MO) degradation tests of functional cashmere sweaters prepared using TO, BO (boron oxide only), TB1 and TB 2. The MO concentration decreased by 50% and 57% after 210min under uv light for functional cashmere sweaters made with TB1 and TB2, respectively, whereas the MO concentration decreased by only 20% after 210min under uv light for cashmere sweaters made with TO and BO. The test result shows that the boron-doped TiO₂Compare TiO₂Or boron oxide, provides better self-cleaning properties. TB2 provided better self-cleaning performance than TB1, indicating that more boron was doped into TiO₂In the middle, the self-cleaning performance is improved.

Fig. 5 shows the results of Methyl Orange (MO) degradation tests of functional cashmere sweaters prepared using TB 2. Three portions of functional cashmere sweater were cut for testing. After 7.5hr of visible light irradiation, the MO concentration in the three fractions decreased by 94%.

FIG. 6 shows the use of boron-doped TiO with different concentrations₂The result of the washing stability test of the functional cashmere sweater prepared with TB 2. Before washing, the MO concentration of the functional cashmere sweater prepared with concentrations of 2.5% and 5% (v/v) TB2 decreased by 97% after 8.5hr of visible light irradiation. After 5 washes, the MO concentrations of the functional cashmere sweaters prepared with concentrations of 2.5% and 5% (v/v) TB2 decreased by 85% and 91%, respectively, after 8.5hr of visible light irradiation. The results show that the functional cashmere sweater still has good self-cleaning performance after washing due to the existence of the CMC layer. In addition, higher boron doped TiO is used₂The functional cashmere sweater prepared in concentration provides better self-cleaning performance after washing.

Fig. 7 shows the MO degradation test results of different soaking times before washing for functional cashmere yarns prepared using TB 2. Soaking for 5, 10 and 15min (soaking yarn in boron-doped TiO)₂Time in solution) the MO concentration of the prepared functional yarn decreased by 99% after 90min of visible light irradiation, while the MO concentration of the original white yarn (control sample) decreased by only 5%. The results show thatThe functional cashmere yarn has a self-cleaning function, while the original yarn does not.

Fig. 8 shows the MO degradation test results of functional cashmere yarns prepared using TB2 for different soaking times after washing. After 5 washes, the MO concentration of the functional cashmere yarn with soaking time of 5min, 10min and 15min respectively decreased by 91% after 5.5hr of visible light irradiation. The MO concentration decays faster for functional cashmere yarns with shorter soaking times (e.g. 5min) than for functional cashmere yarns with longer soaking times (e.g. 10min and 15 min).

Example 6: red wine removal test

The red wine removal test was as follows: dropping 100 μ L of red wine on the fabric, allowing the red wine to stay on the fabric for 30min, rinsing the fabric with water, irradiating the stained fabric under visible light for 20hr, observing the residual color on the fabric, and recording the color change on the fabric by photographing.

Fig. 9 is the result of a red wine removal test of a functional cashmere fabric 91 and an original cashmere fabric 92 prepared with TB 2. As shown in the photograph of fig. 9, after irradiation with visible light for 20hr, no stain was found on the surface of the functional cashmere fabric 91 (lower left of the photograph), while after irradiation with visible light for 20hr, a stain 93 was still visible on the surface of the original cashmere fabric 92 (lower right of the photograph).

Example 7: coffee removal test

The coffee removal test is as follows: dropping 100 μ L of coffee on the fabric, allowing the coffee to stay on the fabric for 30min, rinsing the fabric with water, irradiating the fabric with stain under visible light for 20hr, observing the residual color on the fabric, and recording the color change on the fabric by photographing.

Fig. 10 is the coffee removal test results of the functional cashmere fabric 101 and the original cashmere fabric 102 prepared with TB 2. No stains were found on the surface of the functional cashmere fabric 101 (lower left of the photograph), while stains 103 were still visible on the surface of the original cashmere fabric 102 (lower right of the photograph).

Fig. 11A is an SEM image of the original cashmere fabric. As shown in fig. 11A, the original cashmere textile includes original cashmere fibres 111. FIG. 11B is a functional cashmere prepared by TB2SEM image of fabric. As shown in fig. 11B, the functional cashmere textile includes functional cashmere fibers 112. The functional cashmere fiber 112 is made of TiO containing boron₂Boron-doped TiO nanoparticles₂Layer 113 is covered.

Fig. 12 is an X-ray diffraction (XRD) spectrum of the original cashmere fiber and the functional cashmere fiber prepared with TO. The results show that the surface of the cashmere fiber is coated with TiO₂And (3) a layer.

Thus, it can be seen that the present invention provides a visible light active self-cleaning formulation and method for the manufacture of functional cashmere fibres, yarns, fabrics or textiles. Photocatalytic boron-doped TiO₂The coating is used for functionalizing cashmere fibers, yarns, fabrics or textiles, and can realize the removal of pollutants through a light-triggered oxidation mechanism. CMC is used as a binder, so that the washing stability of the self-cleaning coating is improved. The hand feel (e.g. 5-10% change based on fabric touch test) and color change (e.g. 1-scale based on AATCC grey scale evaluation program) of the functional cashmere fibres, yarns, fabrics or textiles according to the present invention are hardly affected except for stain resistance.

While the invention has been described in terms of certain embodiments, other embodiments that are apparent to those of ordinary skill in the art are also within the scope of the invention. Accordingly, the scope of the invention is to be limited only by the following claims.

Claims

1. A functional cashmere fibre comprising:

cashmere fibers;

comprising boron-doped titanium dioxide (TiO)₂) A layer of (a); and

a binder comprising carboxymethyl cellulose (CMC) for binding said layer to said cashmere fibres such that said layer at least partially covers said cashmere fibres.

2. The functional cashmere fiber according to claim 1, wherein said boron-doped TiO is₂In a molar ratio of boron to titanium of between 0.3:1 and 1.2: 1.

3. The functional cashmere fibre according to claim 1, wherein said layer has a thickness between 10nm and 100 nm.

4. The functional cashmere fibres according to claim 1, wherein said layer completely covers said cashmere fibres.

5. The functional cashmere fibres according to claim 1, wherein said cashmere fibres have a diameter comprised between 5 μm and 30 μm.

6. The functional cashmere fiber according to claim 1, wherein said boron-doped TiO is₂Is between 0.9:1 and 1.1:1, and the thickness of the layer is between 10nm and 50 nm.

7. A functional yarn comprising the functional cashmere fiber of claim 1 or 6.

8. A functional fabric comprising the functional cashmere fiber of claim 1 or 6.

9. A method of making the functional cashmere fibres of claim 1, comprising:

providing CMC coated fibers, wherein the CMC coated fibers are CMC coated cashmere fibers; and

mixing the CMC coated fiber with boron-doped TiO₂Contacting, thereby forming said functional cashmere fibres.

10. The method of claim 9, wherein the boron-doped TiO₂In a molar ratio of boron to titanium of between 0.3:1 and 1.2: 1.

11. The method of claim 9, further comprising:

contacting the cashmere fibres with a first solution comprising CMC, thereby forming the CMC coated fibres.

12. The process according to claim 11, wherein the first solution is a CMC sodium salt solution.

13. The method according to claim 11, wherein the CMC concentration of the first solution is between 0.1% (v/v) and 1% (v/v).

14. The method of claim 9, wherein the CMC coated fibers are mixed with boron-doped TiO₂The step of contacting comprises: mixing the CMC coated fiber with a binder comprising boron doped TiO₂Or TiO doped with boron₂A second solution of the precursor, thereby forming the boron-doped TiO₂-CMC coated fibers; and

solidifying the boron-doped TiO₂-CMC coated fibers to form said functional cashmere fibers.

15. The method of claim 14, wherein the boron-doped TiO₂The precursor comprising TiO₂A precursor, a boron precursor, and an acidic aqueous solution.

16. The method according to claim 15, wherein the TiO₂The precursor is titanium alkoxide or titanium tetrachloride, the boron precursor is trialkyl borate or boric acid, and the acidic aqueous solution is acetic acid, nitric acid or hydrochloric acid.

17. The method of claim 14, wherein the curing step comprises curing the boron-doped TiO at a temperature between 90 ℃ and 150 ℃₂-CMC coated fibers.

18. The method according to claim 9, wherein the method for preparing the functional cashmere fibres comprises:

contacting cashmere fibres with a first solution comprising CMC, wherein the first solution is a CMC sodium salt solution having a CMC concentration between 0.4% (v/v) and 0.6% (v/v), thereby forming said CMC coated fibres;

mixing the CMC coated fiber with a binder comprising boron doped TiO₂Or TiO doped with boron₂A second solution of the precursor, thereby forming the boron-doped TiO₂-CMC coated fibers, wherein the boron-doped TiO₂In a molar ratio of boron to titanium of between 0.9:1 and 1.1: 1; and

curing the boron-doped TiO at a temperature between 110 and 130₂-CMC coated fibers, thereby forming said functional cashmere fibers.

19. A method of making a functional cashmere yarn comprising:

providing a CMC coated yarn, wherein the CMC coated yarn is a CMC coated cashmere yarn;

mixing the CMC coated yarn with a binder comprising boron doped TiO₂Or TiO doped with boron₂A second solution of the precursor, thereby forming the boron-doped TiO₂-a CMC coated yarn; and

solidifying the boron-doped TiO₂-CMC coated yarn, thereby forming said functional cashmere yarn.

20. A method of preparing a functional cashmere textile comprising:

providing a CMC coated fabric, wherein the CMC coated fabric is a CMC coated cashmere fabric;

contacting said CMC coated fabric with a composition comprising boron doped TiO₂Or TiO doped with boron₂A second solution of the precursor, thereby forming the boron-doped TiO₂-a CMC coated fabric; and

solidifying the boron-doped TiO₂-CMC coated fabric, thereby forming said functional cashmere fabric.