阅读说明：本技术 复合蚕丝及其制备方法 (Composite silk and preparation method thereof ) 是由 杨波 吴长征 谢毅 于 2019-09-23 设计创作，主要内容包括：本发明公开一种复合蚕丝及其制备方法。其中,所述复合蚕丝的制备方法包括以下步骤：提供纳米二氧化钛、桑叶及蚕丝；将所述纳米二氧化钛喷洒至所述桑叶的表面,喂食蚕,或者将所述纳米二氧化钛对所述蚕丝进行改性,得到复合蚕丝。本发明的技术方案能够提高蚕丝的力学性能。(The invention discloses a composite silk and a preparation method thereof. The preparation method of the composite silk comprises the following steps: providing nano titanium dioxide, mulberry leaves and silk; and spraying the nano titanium dioxide on the surface of the mulberry leaf, and feeding the mulberry leaf to silkworm, or modifying the silk by using the nano titanium dioxide to obtain the composite silk. The technical scheme of the invention can improve the mechanical property of the silk.)

1. the preparation method of the composite silk is characterized by comprising the following steps:

Providing nano titanium dioxide, mulberry leaves and silk;

and spraying the nano titanium dioxide on the surface of the mulberry leaf, and feeding the mulberry leaf to silkworm, or modifying the silk by using the nano titanium dioxide to obtain the composite silk.

2. The method for preparing composite silk according to claim 1, wherein the step of modifying the silk with nano titanium dioxide to obtain the composite silk comprises:

dispersing the nano titanium dioxide into a dispersing agent to obtain a titanium dioxide colloidal solution;

and soaking the silk in the titanium dioxide colloidal solution, taking out and drying to obtain the composite silk.

3. The method for preparing compound silk according to claim 2, wherein the dispersing agent is at least one selected from the group consisting of water, ethanol, ethyl acetate, ethylene glycol, cyclohexane, toluene and acetonitrile;

And/or, in the step of soaking the silk in the titanium dioxide colloidal solution, taking out and drying, the method comprises the following steps:

And soaking the silk in the titanium dioxide colloidal solution for 0.1-10 h, taking out, and drying at the temperature of 5-50 ℃ for 0.5-12 h.

4. the method for preparing composite silk according to claim 1, wherein the step of modifying the silk with nano titanium dioxide to obtain the composite silk comprises:

Dispersing the nano titanium dioxide into a dispersing agent to obtain a titanium dioxide colloidal solution;

And spraying the titanium dioxide solution on the surface of the silk, and drying to obtain the composite silk.

5. The method for preparing composite silk according to claim 1, wherein the step of spraying the nano titanium dioxide on the surface of the mulberry leaves comprises:

Dispersing the nano titanium dioxide into a dispersing agent to obtain a titanium dioxide colloidal solution;

Spraying the titanium dioxide solution on the surface of the mulberry leaves.

6. The method for preparing compound silk according to any one of claims 1 to 5, wherein the nano titanium dioxide is used in an amount of 0.01 to 5% by weight of the mulberry leaves;

And/or the dosage of the nano titanium dioxide is 0.01 to 1 percent of the weight of the silk.

7. The method for preparing composite silk according to claim 1, wherein the nano titanium dioxide is prepared by the following steps:

Mixing a titanium compound, a coordination agent and a first solvent to obtain a first solution;

Mixing a hydrolytic agent with a second solvent to obtain a second solution;

Mixing the first solution and the second solution to obtain titanium dioxide colloid;

And drying the titanium dioxide colloid to obtain the nano titanium dioxide.

8. The method for preparing composite silk according to claim 7, wherein the titanium compound, the complexing agent and the first solvent are used in a ratio ranging from (0.01g to 50 g): (0.1g-10 g): 200 mL;

And/or the dosage ratio of the hydrolytic agent to the second solvent is (0.1mL-50 mL): 100 mL;

And/or the dosage ratio of the titanium compound to the hydrolytic agent is (0.01g-50 g): 10 mL.

9. The method for preparing composite silk according to claim 7, wherein the titanium compound is at least one selected from the group consisting of titanium tert-butoxide, titanium trichloride, titanium tetrachloride, titanyl ammonium oxalate, tetraisobutyl titanate, tetra-n-butyl titanate, titanium isopropoxide and titanium sulfate;

And/or the complexing agent is selected from at least one of ethanolamine, triethylamine, oleylamine, citric acid, potassium citrate, sodium dihydrogen citrate, potassium dihydrogen citrate, oleic acid, oxalic acid, ammonium oxalate, sodium dodecyl benzene sulfonate, hexadecyl trimethyl ammonium bromide and ethylene diamine tetraacetic acid;

and/or the first solvent and the second solvent are both selected from at least one of deionized water, cyclohexane, absolute ethyl alcohol and acetone;

and/or the hydrolytic agent is at least one selected from ammonia water, formic acid, methylamine, ethanol, acetic acid and ethylenediamine.

10. composite silk, characterized in that it is produced by the method for producing composite silk according to any one of claims 1 to 9.

Technical Field

the invention relates to the technical field of silk preparation, in particular to a composite silk and a preparation method thereof.

Background

The silk is a natural biological fiber material with excellent performance, has a unique layered structure, excellent mechanical properties, excellent biocompatibility and the like, and has wide application prospects in the biomedical field, such as application in biosensors, contact lenses, drug carriers and the like. China has a history of silkworm breeding for thousands of years, a large amount of silk can be obtained, but the mechanical properties (such as strength and elasticity) of the silk obtained at present are still relatively poor, so that certain applications of the silk are restricted to a certain extent.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to provide a composite silk and a preparation method thereof, aiming at improving the mechanical property of the silk.

In order to achieve the purpose, the preparation method of the composite silk provided by the invention comprises the following steps:

Providing nano titanium dioxide, mulberry leaves and silk;

And spraying the nano titanium dioxide on the surface of the mulberry leaf, and feeding the mulberry leaf to silkworm, or modifying the silk by using the nano titanium dioxide to obtain the composite silk.

Optionally, in the step of modifying the silk with the nano titanium dioxide to obtain the composite silk, the method includes:

Dispersing the nano titanium dioxide into a dispersing agent to obtain a titanium dioxide colloidal solution;

and soaking the silk in the titanium dioxide colloidal solution, taking out and drying to obtain the composite silk.

Optionally, the dispersant is selected from at least one of water, ethanol, ethyl acetate, ethylene glycol, cyclohexane, toluene and acetonitrile; and/or, in the step of soaking the silk in the titanium dioxide colloidal solution, taking out and drying, the method comprises the following steps:

and soaking the silk in the titanium dioxide colloidal solution for 0.1-10 h, taking out, and drying at the temperature of 5-50 ℃ for 0.5-12 h.

Optionally, in the step of modifying the silk with the nano titanium dioxide to obtain the composite silk, the method includes:

Dispersing the nano titanium dioxide into a dispersing agent to obtain a titanium dioxide colloidal solution;

And spraying the titanium dioxide solution on the surface of the silk, and drying to obtain the composite silk.

optionally, in the step of spraying the nano titanium dioxide to the surface of the mulberry leaf, the method comprises the following steps:

Dispersing the nano titanium dioxide into a dispersing agent to obtain a titanium dioxide colloidal solution;

Spraying the titanium dioxide solution on the surface of the mulberry leaves.

Optionally, the nano titanium dioxide is used in an amount of 0.01 to 5 percent of the weight of the mulberry leaves; and/or the dosage of the nano titanium dioxide is 0.01 to 1 percent of the weight of the silk.

Optionally, the nano titanium dioxide is prepared by the following steps:

mixing a titanium compound, a coordination agent and a first solvent to obtain a first solution;

mixing a hydrolytic agent with a second solvent to obtain a second solution;

Mixing the first solution and the second solution to obtain titanium dioxide colloid;

And drying the titanium dioxide colloid to obtain the nano titanium dioxide.

Alternatively, the titanium compound, the complexing agent and the first solvent are used in a ratio ranging from (0.01g to 50 g): (0.1g-10 g): 200 mL; and/or the dosage ratio of the hydrolytic agent to the second solvent is (0.1mL-50 mL): 100 mL; and/or the dosage ratio of the titanium compound to the hydrolytic agent is (0.01g-50 g): 10 mL.

optionally, the titanium compound is selected from at least one of titanium tert-butoxide, titanium trichloride, titanium tetrachloride, titanyl ammonium oxalate, tetraisobutyl titanate, tetra-n-butyl titanate, titanium isopropoxide, and titanium sulfate; and/or the complexing agent is selected from at least one of ethanolamine, triethylamine, oleylamine, citric acid, potassium citrate, sodium dihydrogen citrate, potassium dihydrogen citrate, oleic acid, oxalic acid, ammonium oxalate, sodium dodecyl benzene sulfonate, hexadecyl trimethyl ammonium bromide and ethylene diamine tetraacetic acid; and/or the first solvent and the second solvent are both selected from at least one of deionized water, cyclohexane, absolute ethyl alcohol and acetone; and/or the hydrolytic agent is at least one selected from ammonia water, formic acid, methylamine, ethanol, acetic acid and ethylenediamine.

The invention also provides the composite silk, and the silk is prepared by the preparation method of the composite silk.

According to the technical scheme, the composite silk containing titanium dioxide can be obtained by directly spraying the nano titanium dioxide on the surface of the mulberry leaves to feed silkworms or modifying the silk with the nano titanium dioxide. Because the composite silk contains the nano titanium dioxide, the obtained silk has higher fiber ultimate breaking strength, breaking elongation, ultraviolet resistance and antibacterial performance, namely the mechanical property of the silk is greatly improved, so that the application of the silk is wider, the speed of silk textile operation is increased, and the production efficiency is improved.

Drawings

in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is an XRD pattern of nano-titanium dioxide prepared in example 1 of the present invention;

FIG. 2 is a scanning electron micrograph of the nano titanium dioxide prepared in example 1 of the present invention;

FIG. 3 is a graph of the UV-visible transmittance of the nano titanium dioxide prepared in example 1 of the present invention;

fig. 4 is a graph comparing stress-strain curves of the composite silk prepared in example 1 of the present invention and a common silk.

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

the technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

the invention provides a preparation method of composite silk, which comprises the following steps:

providing nano titanium dioxide, mulberry leaves and silk;

And spraying nano titanium dioxide on the surface of the mulberry leaf, and feeding the mulberry leaf to silkworm, or modifying the silk by using the nano titanium dioxide to obtain the composite silk.

the invention adopts the nanometer titanium dioxide to directly spray on the surface of the mulberry leaves to feed the silkworms, or the nanometer titanium dioxide is used for modifying the silks, so that the composite silks containing the titanium dioxide can be obtained. Because the composite silk contains the nano titanium dioxide, the obtained silk has higher fiber ultimate breaking strength, breaking elongation, ultraviolet resistance and antibacterial performance, namely the mechanical property of the silk is greatly improved, so that the application of the silk is wider, the speed of silk textile operation is increased, and the production efficiency is improved.

in an embodiment of the present invention, the step of modifying silk with nano titanium dioxide to obtain composite silk includes:

dispersing nano titanium dioxide into a dispersing agent to obtain a titanium dioxide colloidal solution;

And (3) soaking the silk in a titanium dioxide colloidal solution, taking out and drying to obtain the composite silk.

dispersing nano titanium dioxide into a dispersing agent, stirring to obtain a uniformly dispersed titanium dioxide colloidal solution, directly soaking common silk into the titanium dioxide colloidal solution, wherein titanium dioxide components can be attached to the surface of the silk, modifying the silk, taking out and drying after soaking for a period of time, and thus obtaining the composite silk. This embodiment adopts the mode of soaking to obtain compound silk, and the operation is comparatively simple, and the mechanical properties of the compound silk that obtains is better.

It should be noted that, here, the mass ratio of the nano titanium dioxide to the dispersant ranges from (0.5g to 20 g): 100 mL.

Optionally, the dispersant is selected from at least one of water, ethanol, ethyl acetate, ethylene glycol, cyclohexane, toluene, and acetonitrile. The dispersing agent is a solvent, and generally one or more of water, ethanol, ethyl acetate, ethylene glycol, cyclohexane, toluene and acetonitrile are selected, so that nano titanium dioxide powder can be better dispersed to obtain a titanium dioxide colloidal solution.

Optionally, the step of soaking silk in titanium dioxide colloidal solution, taking out and drying includes:

Soaking silk in titanium dioxide colloidal solution for 0.1-10 h, taking out, and drying at 5-50 deg.C for 0.5-12 h.

Here, the soaking time is controlled within a range of 0.1h to 10h, so that titanium dioxide can be sufficiently attached to the silk, thereby obtaining the composite silk with better mechanical properties, and the soaking time is preferably 1h to 5h, such as 1h, 2h, 3h or 4 h. The drying temperature is controlled in the range of 5 ℃ to 50 ℃, preferably 20 ℃ to 40 ℃, such as at 20 ℃, 30 ℃ or 40 ℃. The drying time is controlled within the range of 0.5h to 12h, preferably 0.5h to 6h, for example, the drying time is 1h, 3h, 4h or 5 h.

In an embodiment of the present invention, the step of modifying silk with nano titanium dioxide to obtain composite silk includes:

dispersing nano titanium dioxide into a dispersing agent to obtain a titanium dioxide colloidal solution;

And spraying a titanium dioxide solution on the surface of the silk, and drying to obtain the composite silk.

In this embodiment, adopt the mode of spraying to modify silk for titanium dioxide colloidal solution sprays more evenly on the surface of silk, easy operation, and the compound silk mechanical properties after the drying is better. The drying operation is the same as that of the above embodiment, and reference may be made to the above embodiment for details, which are not repeated herein.

in one embodiment of the present invention, the step of spraying the nano titanium dioxide on the surface of the mulberry leaf comprises:

dispersing nano titanium dioxide into a dispersing agent to obtain a titanium dioxide colloidal solution;

spraying titanium dioxide solution on the surface of mulberry leaves.

The nano titanium dioxide powder is firstly dispersed to the dispersing agent to obtain a uniform titanium dioxide colloidal solution, and then the titanium dioxide solution is sprayed on the surface of the mulberry leaves, so that the titanium dioxide colloidal solution can be uniformly dispersed on the surface of the mulberry leaves, and the finally obtained composite silk has good mechanical property.

Optionally, the nano titanium dioxide is 0.01-5% of the mulberry leaf by weight. When the nano titanium dioxide is sprayed on the surface of the mulberry leaf and the silkworm is fed, the use amount of the nano titanium dioxide is reasonable, so that the finally obtained composite silk has good mechanical property, and the waste of the nano titanium dioxide material is avoided. Generally, the nano titanium dioxide is used in an amount of 0.01 to 5% by weight of the mulberry leaves, preferably 0.05 to 1% by weight of the mulberry leaves, such as 0.1%, 0.5%, 0.8% or 1% by weight of the mulberry leaves.

Optionally, the amount of nano titanium dioxide is 0.01% to 1% of the weight of silk. Similarly, when the nano titanium dioxide is adopted to modify the common silk, the use amount of the nano titanium dioxide is also ensured to be reasonable, so that the finally obtained composite silk has better mechanical property, and the waste of the nano titanium dioxide material can not be caused. Typically, the amount of nano-titania is 0.01% to 1% by weight of silk, preferably 0.05% to 1% by weight of silk, such as 0.1%, 0.5%, 0.8% or 1% by weight of silk.

In one embodiment of the present invention, the nano titanium dioxide is prepared by the following steps:

mixing a titanium compound, a coordination agent and a first solvent to obtain a first solution;

mixing a hydrolytic agent with a second solvent to obtain a second solution;

Mixing the first solution and the second solution to obtain titanium dioxide colloid;

Drying the titanium dioxide colloid to obtain the nano titanium dioxide.

The titanium compound can be inorganic titanium compound or organic titanium compound, and the titanium compound is used as the main raw material for preparing the nano titanium dioxide. The hydrolysis agent is added to enable the titanium compound to generate hydrolysis reaction to generate titanium ions, a titanium source is provided for generating titanium dioxide, the titanium ions and an oxygen source react to generate titanium dioxide, and the oxygen source generally comes from a solvent. The addition of the complexing agent can enable titanium ions to react to generate a complex so as to inhibit the hydrolysis rate of the titanium compound, thereby controlling the preparation rate of the nano titanium dioxide. Mixing a first solution containing a titanium compound, a complexing agent and a first solvent with a second solution containing a hydrolytic agent and a second solvent, and stirring to fully react to obtain a titanium dioxide colloid. It should be noted that, in the mixing operation of the first solution and the second solution, the second solution is generally slowly added dropwise to the first solution, so as to ensure that the reaction is more stable and fully performed, which is further beneficial to improving the yield of the nano titanium dioxide. Finally, drying the obtained titanium dioxide colloid to obtain the nano titanium dioxide powder. As the titanium dioxide colloid is a mixture of the nano material and the solvent, the subsequent drying operation only needs solid-liquid separation without washing operation, the preparation method is simple in operation and low in operation cost, secondary pollution such as waste water is avoided in the preparation process, and the preparation method has good economic benefit and environmental protection benefit. And the silk is modified by the prepared nano titanium dioxide, so that the utilization rate is high, and the mechanical property of the silk can be effectively improved.

Alternatively, the titanium compound, the complexing agent and the first solvent are used in a ratio ranging from (0.01g to 50 g): (0.1g-10 g): 200 mL.

In order to better control the hydrolysis rate of the titanium compound and increase the yield of the nano titanium dioxide, the dosage ratio of the titanium compound, the complexing agent and the first solvent is reasonably adjusted. For example, the dosage ratio of the titanium compound, the complexing agent and the first solvent is (0.01g-50 g): (0.1g-10 g): 200mL, and the dosage of the titanium compound, the complexing agent and the first solvent in the proportioning range can be selected when preparing the first solution. Preferably, the titanium compound, the complexing agent and the first solvent are used in a ratio ranging from (0.01g to 50 g): (0.1g-8 g): 200mL, for example, the dosage ratio of the titanium compound, the complexing agent and the first solvent is 30 g: 6 g: 150 mL.

Alternatively, the amount ratio of the hydrolyzing agent to the second solvent ranges from (0.1mL to 50 mL): 100 mL.

Similarly, in order to better control the hydrolysis rate of the titanium compound and increase the yield of the nano titanium dioxide, the ratio of the hydrolyzing agent to the second solvent is also reasonably adjusted. For example, the dosage ratio of the hydrolytic agent to the second solvent is selected from the range of (0.1mL-50 mL): 100mL, and when preparing the second solution, the dosage of the hydrolytic agent and the second solvent is selected from the dosage within the proportioning range. Preferably, the amount ratio of the hydrolyzing agent to the second solvent ranges from (0.1mL to 50 mL): 80mL, for example, the dosage ratio of the hydrolytic agent to the second solvent is 10 mL: 40 mL.

Alternatively, the titanium compound and the hydrolyzing agent are used in a ratio ranging from (0.01g to 50 g): 10 mL. In order to ensure that the titanium compound can be fully hydrolyzed and the yield of the nano titanium dioxide is higher, the dosage of the titanium compound and the hydrolytic agent is reasonably adjusted. For example, the dosage ratio of the titanium compound to the hydrolytic agent is (0.01g-50 g): 10mL, and the dosage of the titanium compound and the hydrolytic agent is selected from the dosage within the range of the mixture ratio during preparation. Preferably, the ratio of the amount of titanium compound to the amount of hydrolysis agent ranges from (0.1g to 50 g): 10mL, for example, the dosage ratio of the titanium compound to the hydrolytic agent is 25 g: 10 mL.

Optionally, the titanium compound is selected from at least one of titanium tert-butoxide, titanium trichloride, titanium tetrachloride, ammonium titanyl oxalate, tetraisobutyl titanate, tetra-n-butyl titanate, titanium isopropoxide, and titanium sulfate. When the titanium compound is used, one or a mixture of two or more of these may be used. Preferably one or more of titanium tetrachloride, ammonium titanyl oxalate, tetraisobutyl titanate, tetra-n-butyl titanate, titanium isopropoxide and titanium sulfate.

optionally, the complexing agent is selected from at least one of ethanolamine, triethylamine, oleylamine, citric acid, potassium citrate, sodium dihydrogen citrate, potassium dihydrogen citrate, oleic acid, oxalic acid, ammonium oxalate, sodium dodecylbenzenesulfonate, cetyltrimethylammonium bromide, and ethylenediaminetetraacetic acid. When a complexing agent is used, one or more mixtures of these substances may be used. Preferably, one or more of ethanolamine, triethylamine, citric acid, potassium citrate, sodium dihydrogen citrate, potassium dihydrogen citrate, oxalic acid, ammonium oxalate, sodium dodecyl benzene sulfonate, hexadecyl trimethyl ammonium bromide and ethylene diamine tetraacetic acid are selected, so that the hydrolysis rate of the titanium compound can be more effectively inhibited, and the preparation process is more stably carried out.

Optionally, the first solvent and the second solvent are both selected from at least one of deionized water, cyclohexane, absolute ethanol, and acetone. Here, the first solvent may be selected from one or more of deionized water, cyclohexane, absolute ethyl alcohol and acetone, preferably one or more of deionized water, cyclohexane and absolute ethyl alcohol; the second solvent may be selected from one or more of deionized water, cyclohexane, anhydrous ethanol and acetone, preferably one or more of deionized water, cyclohexane and anhydrous ethanol. The first solvent and the solvent may be different or the same in composition, and are not limited herein.

optionally, the hydrolyzing agent is selected from at least one of ammonia, formic acid, methylamine, ethanol, acetic acid, and ethylenediamine. When the hydrolytic agent is used, one or more of the hydrolytic agents can be selected, and one or more of ammonia water, ethanol, acetic acid and ethylenediamine is preferred.

Alternatively, in the step of mixing the first solution and the second solution to obtain the titanium dioxide colloid, the method comprises:

and dropwise adding the second solution into the first solution at the speed range of 0.1 to 50 drops/second, controlling the temperature range to be 5 to 100 ℃, and stirring to obtain the titanium dioxide colloid.

the first solution and the second solution are mixed in a dropwise manner, so that the first solution and the second solution are fully mixed, the reaction is more complete, and the yield of the nano titanium dioxide is improved. In particular operation, the dropping rate is generally in the range of 0.1 drops/second to 50 drops/second, alternatively in the range of 0.2 drops/second to 10 drops/second, such as at a dropping rate of 0.3 drops/second, 1 drop/second, 3 drops/second, 6 drops/second, or 10 drops/second. When the second solution is added dropwise, the temperature of the first solution is controlled appropriately to ensure that the reaction is sufficiently carried out, and generally, the temperature is controlled in the range of 5 ℃ to 100 ℃, for example, 20 ℃, 40 ℃, 60 ℃, 80 ℃ or 95 ℃. When the second solution is dropwise added, the first solution is stirred simultaneously, so that the first solution and the second solution are fully mixed, the reaction is more fully carried out, and the yield of the nano titanium dioxide is improved.

Optionally, the step of drying the titanium dioxide colloid to obtain the nano titanium dioxide comprises:

Drying the titanium dioxide colloid by adopting a freeze drying, heating drying or spray drying method, wherein the drying temperature is in the range of-50 ℃ to 150 ℃, and the drying time is in the range of 1h to 72 h.

Drying the titanium dioxide to remove the solvent, wherein the drying operation can be one of freeze drying, heat drying and spray drying, and the drying temperature and drying time are reasonably controlled to obtain the dried nano titanium dioxide powder, generally, the drying temperature is controlled to be in the range of-50 ℃ to 150 ℃, preferably, the drying temperature is controlled to be in the range of 0 ℃ to 120 ℃, for example, the drying temperature is controlled to be 80 ℃; meanwhile, the drying time is controlled within the range of 1h-72h, preferably, the drying time is controlled within the range of 8h-36h, for example, the drying time is controlled within 15 h.

the invention also provides the composite silk, and the composite silk is prepared by the preparation method of the composite silk. The composite silk prepared by the invention has higher fiber ultimate breaking strength, breaking elongation, ultraviolet resistance and antibacterial performance, namely the mechanical property of the silk is greatly improved, so that the application of the silk is wider, and simultaneously, the composite silk is beneficial to improving the speed of silk spinning operation and improving the production efficiency.

The composite silk and the preparation method thereof of the present invention are described in detail by the following specific examples.