Electrostatic spinning polymer solution for reinforcing ancient silk fabrics and reinforcing method

Abstract

The invention provides an electrostatic spinning polymer solution for reinforcing ancient silk fabrics and a reinforcing method. The electrostatic spinning polymer solution is prepared from the following components: 15ml of deionized water, 2.667 g of polyvinyl alcohol, 6.223 g of silk fibroin powder, 1ml of ethanol and 2ml of glycerol. The invention also provides a method for reinforcing ancient silk fabrics by using the electrostatic spinning polymer solution. According to the method, the electrostatic spinning polymer solution is used for treating the ancient silk fabric, the reinforced ancient silk fabric can keep long-time stability in the natural environment, the storage life of the reinforced ancient silk fabric is prolonged, and therefore the problems that in the prior art, the reinforcing effect is not ideal, and secondary damage is caused to cultural relics are solved.

Description

Technical Field

[0001] The invention belongs to the field of cultural relics restoration, and relates to a solution for treating ancient silk fabrics, and specifically to an electrostatic spinning polymer solution and a reinforcement method for reinforcing ancient silk fabrics. Background Art

[0002] The main component of silk fabrics unearthed from ancient tombs is protein. Due to the long burial time, they are extremely susceptible to factors such as light, heat, humidity and microorganisms during the burial process. There are common problems such as reduced strength, fiber breakage, and embrittlement, and they are in urgent need of reinforcement and repair. At present, textile reinforcement methods can be divided into two categories. The first category is physical reinforcement, which mainly includes clamping method, backing method and screen reinforcement method. Physical reinforcement method is relatively safe for reinforcing silk fabrics, generally does not damage silk fabrics, is reversible, and can be reinforced multiple times, but it is only suitable for textiles with a certain strength and can withstand sewing force. It is not suitable for fragile textiles with poor strength. At the same time, it requires a lot of manpower and requires high weaving and sewing skills for people engaged in this work. The second category is chemical reinforcement methods, such as the Pellaron reinforcement method and the resin film reinforcement method. Usually, hot pressing bonding and solvent melt bonding are used to form a film of chemical reagents such as vinyl acetate fiber, polyester, polyethylene, and nylon on the surface of silk fabrics to play a role in protection and reinforcement. However, this method will cause the surface of the textile to turn white, chemical residues, etc., and the aging of the polymer film will bring devastating disasters to textile cultural relics, which has potential risks.

[0003] Electrospinning technology can produce nano-scale fiber materials, which have the advantages of high specific surface area and high porosity, and can be better combined with silk fabrics to improve the reinforcement effect. However, in the prior art, electrospinning technology is rarely applied to the field of ancient silk fabric reinforcement. At the same time, there is a lack of effective polymer solution formulas and application methods suitable for ancient silk fabrics. Therefore, a new technical solution is urgently needed to solve the above problems. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide an electrospinning polymer solution for reinforcing ancient silk fabrics. The electrospinning polymer solution can be used for the treatment of ancient silk fabrics to solve the problems of unsatisfactory reinforcement effect and secondary damage to cultural relics in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides an electrospinning polymer solution for reinforcing ancient silk fabrics, each electrospinning polymer solution consisting of the following components: 15 ml of deionized water, 2.667 g of polyvinyl alcohol (PVA), 6.223 g of silk fibroin powder (SF), 1 ml of ethanol (C2H6O), and 2 ml of glycerol (C3H8O3).

[0006] Preferably, the polyvinyl alcohol is cold water soluble polyvinyl alcohol; more preferably, the polyvinyl alcohol is 1788 type polyvinyl alcohol.

[0007] The present invention also provides a method for preparing the electrospinning polymer solution for reinforcing ancient silk fabrics, comprising the following steps:

[0008] 1) dissolving silk fibroin powder in deionized water to prepare a silk fibroin solution;

[0009] 2) adding polyvinyl alcohol particles to the silk fibroin solution, swelling at room temperature for 4 hours, and stirring to form a mixed solution;

[0010] 3) The mixed solution was heated at 60° C. for 30 min to completely defoam the solution, and then the additive to be tested was added and stirred evenly to obtain an electrospinning polymer solution.

[0011] Since polyvinyl alcohol needs to be constantly stirred during swelling, many small bubbles will form in the solution, affecting the subsequent film formation. Therefore, it needs to be heated for defoaming after stirring evenly.

[0012] The present invention also provides a method for reinforcing ancient silk fabrics using the electrospinning polymer solution, comprising the following steps:

[0013] 1) Take a syringe barrel, connect a liquid guide tube, connect a stainless steel dispensing needle to the other end of the liquid guide tube, inject the electrospinning polymer solution into the syringe, and exhaust the air in the syringe and the liquid guide tube;

[0014] 2) Lay the ancient silk fabric flat, fix the syringe to the electric electrospinning device, and make the spinneret at the end of the stainless steel dispensing needle face the ancient silk fabric and be 11-13 cm away from the ancient silk fabric;

[0015] 3) At room temperature, the electrospinning device was started to spin on the ancient silk fabric to form a spinning membrane; during the spinning process, the syringe barrel push speed was maintained at 0.5 ml / h and the voltage was maintained at 20 kV.

[0016] Preferably, the gauge of the needle is 18G.

[0017] Glycerol is widely used as a plasticizer to improve the processing properties, flexibility and ductility of polymers. Pure silk fibroin film is hard and brittle in the dry state, with low elongation at break. Adding plasticizers can effectively improve this situation. The hydrogen bonds of glycerol molecules interact with the hydroxyl groups of silk fibroin to destroy the interaction between silk fibroin chains. Glycerol is a common component unit of most natural lipids and has no additional harm to cultural relics. The viscosity of the spinning solution is one of the important parameters in the electrospinning process, and its change will affect the overall effect of electrospinning. In the process of adding glycerol, the viscosity of the spinning solution also changes to a certain extent, and the viscosity increases with the increase of glycerol content.

[0018] The present invention selects silk fibroin powder, a homologous substance of silk fabric, as the main component of the spinning solution, polyvinyl alcohol is used for filament formation, glycerol and ethanol are added as auxiliary agents to assist film formation, and water is mainly selected as the solvent. The spinning process does not cause any damage to the cultural relics themselves. The reinforced silk fabric can maintain stability for a long time in the natural environment, extending its shelf life. In addition, it will not change the physical characteristics of the textiles, and will not cause shading and secondary damage to the textiles (such as hardening, embrittlement, and loss of original elasticity and luster of the fabric due to chemical components).

[0019] The reinforcement method provided by the present invention is also flexible and controllable, and the diameter, density and number of covering layers of the fibers can be adjusted according to different silk fabric materials and conditions to achieve the best protection effect.

[0020] The membrane prepared by the present invention is reversible, and the electrospinning membrane prepared by the solution ratio can be peeled off when it comes into contact with water, and no chemical components will remain.

[0021] The invention solves the problem that the traditional reinforcement method takes a long time and requires high sewing and weaving skills of the repair technicians, resulting in low reinforcement efficiency. The invention has the advantages of simple operation, fast and stable reinforcement process, etc., and can improve the repair efficiency.

[0022] The beneficial effects of the present invention are:

[0023] The invention provides an electrospinning polymer solution and a preparation method thereof. The electrospinning polymer solution can effectively reinforce ancient silk fabrics, maintain their original shape and color, and extend their shelf life, thereby solving the problems of unsatisfactory reinforcement effect and secondary damage to cultural relics in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The SEM characterization of the membranes at different voltages and speeds using the electrospinning polymer solution provided by the present invention; wherein (a) is U-PVA-1; (b) is U-PVA-2; and (c) is U-PVA-3.

[0025] Figure 2 SEM characterization of membranes at different liquid discharge rates; among them, (a) is V-PVA-1; (b) is V-PVA-2; (c) is V-PVA-3.

[0026] Figure 3 This is a comparison chart of the tensile strength of aged silk and normal silk.

[0027] Figure 4 This is a comparison chart of the tensile strength of aged silk and aged silk coated for different lengths of time.

[0028] Figure 5This is a statistical chart of the peel strength of aged silk coated for 3 hours.

[0029] Figure 6 This is a comparison chart of the tensile strength of aged silk after the addition of the auxiliary agent glycerol. DETAILED DESCRIPTION

[0030] The embodiments of the present invention will be described in detail and comprehensively below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0031] Material:

[0032] 1. Silk fibroin powder (purity ≥ 99%) was purchased from Hefei Bomei Biotechnology Co., Ltd., product number: BBM1118-500g.

[0033] 2. Polyvinyl alcohol 1788 (alcoholysis degree 87.0-89.0%) was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., product number: P105124-500g.

[0034] 3. Ethanol (purity 99.7%) was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0035] 4. Glycerol (AR) was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0036] 5. The specifications of the power-spun silk are 100% silk, 30g / m 2 It is a general commercial product.

[0037] 6. Silicone oil paper and tin foil are both general commercial products.

[0038] 7. The specifications of stainless steel dispensing needles are 15G, 18G, and 21G.

[0039] 8. The syringe barrel is a 10ml regular injection syringe barrel.

[0040] 9. The catheter is a PTFE insulated hose with a PP Luer connector.

[0041] equipment

[0042] 1. The desktop electrospinning machine was purchased from TONG LI TECH.

[0043] 2. The desktop scanning electron microscope was purchased from Phenom Scientific Instruments (Shanghai) Co., Ltd., product model: Phenom Desktop Scanning Electron Microscope Okura Edition 11166-L.

[0044] 3. The electronic universal material testing machine was purchased from Instron (Shanghai) Experimental Equipment Trading Co., Ltd., product model: Instron 3367.

[0045] 4. The viscosity tester was purchased from Brookfield Company, product model: DVNXL VCJG 2.1.6-9.

[0046] 5. The UV aging box (QUV UV aging tester equipped with UVA340 UV lamp) was purchased from Q-LAB, USA.

[0047] 6. The digital micrometer thickness gauge was purchased from Shanghai Newhui Industrial Co., Ltd., product model: BK-3281.

[0048] 7. Infrared detector purchased from Thermo Fisher Scientific, USA, product model: Nicolet TM iS TM 10FTIR spectrometer.

[0049] Example 1 Preparation of Electrospinning Polymer Solution

[0050] Electrospinning polymer solutions containing different glycerol contents were prepared, each containing 15 ml of deionized water, 2.667 g of polyvinyl alcohol, 6.223 g of silk fibroin powder, and 1 ml of ethanol; the glycerol content was 3 mL, 2 mL, or 1 mL, respectively.

[0051] The specific preparation steps are:

[0052] 1) dissolving silk fibroin powder in deionized water to prepare a silk fibroin solution;

[0053] 2) Add polyvinyl alcohol 1788 particles to the silk fibroin solution, swell at room temperature for 4 hours, and stir to form a mixed solution;

[0054] Polyvinyl alcohol type 1788 is a cold water soluble polyvinyl alcohol that can swell at room temperature without heating, and is also convenient for peeling the spinning film from the solidified ancient silk fabric.

[0055] 3) The mixed solution was heated at 60° C. for 30 min to completely defoam the solution, and then different volumes of glycerol and ethanol were added respectively and stirred evenly to obtain electrospinning polymer solutions with different glycerol contents.

[0056] Adding ethanol helps the solvent to evaporate and shorten the curing time. Since ethanol cannot evenly dissolve silk fibroin powder and polyvinyl alcohol, the amount of ethanol added is controlled.

[0057] Among them, the one with 3 mL of glycerol added was numbered as glycerol-PVA-1, the one with 2 mL of glycerol added was numbered as glycerol-PVA-2, and the one with 1 mL of glycerol added was numbered as glycerol-PVA-3.

[0058] Measuring the viscosity of spinning solutions

[0059] At room temperature and pressure, the viscosity of the electrospinning polymer solution was measured using a DVNXL rotational viscometer. The viscometer was adjusted to a horizontal state, the rotor was installed, the rotor height was adjusted, the rotor was slowly immersed in the electrospinning polymer solution, the torque gap was adjusted, and the operation was started. After the data stabilized, the viscosity and shear rate were recorded. The results are shown in Table 1.

[0060] Table 1 Viscosity of spinning solution adjusted by different proportions of glycerol

[0061]

[0062] It can be seen from Table 1 that with the increase of glycerol dosage, the viscosity of electrospinning polymer solution also increases.

[0063] Example 2 Testing of curing conditions of electrospinning polymer solution

[0064] The electrostatic spinning device is a desktop electrospinning machine.

[0065] The electrospinning polymer solution modified with 2 mL of glycerol was added at a pushing speed of 0.5 ml / h, voltages of 13, 16, and 20 kV, and a receiving distance of 12 cm. The spinning membrane was collected at room temperature using the drum of a desktop electrospinning machine as the receiving device and silicone oil paper as the receiving material.

[0066] The fiber membrane was scanned by an infrared detector to obtain a spectrum and analyze the functional groups of the fiber membrane. The wave number range is 4000~500cm -1 , maximum power 130W, DC voltage 12kV.

[0067] The spinning liquid pushing speed was selected as 0.5 ml / h, the receiving distance was 12 cm, and the SEM characterization of the membrane at different voltage speeds was as follows Figure 1 As shown, (a) is U-PVA-1; (b) is U-PVA-2; (c) is U-PVA-3, indicating the effect of film formation under different voltages. The voltages used are shown in Table 2 below;

[0068] Table 2 Effect of voltage on spinning process

[0069]

[0070] from Figure 1 As can be seen from Table 2, under the spinning condition of 20 kV voltage, the fiber clarity and uniformity are better, there is no large area of ​​shadow, the effective spinning amount is large, and the fiber is effectively stretched.

[0071] The spinning parameters are voltage 20kV, receiving distance 12cm, and SEM characterization of the membrane at different liquid outlet speeds. Figure 2As shown in Table 3, (a) represents the sample numbered V-PVA-1; (b) represents the sample numbered V-PVA-2; (c) represents the sample numbered V-PVA-3, and different samples have different liquid discharge speeds. The specific liquid discharge speeds are shown in Table 3, and combined with Figure 2 Analyze the influence on the morphology of spinning membrane.

[0072] Table 3 Effect of liquid discharge speed on spinning process

[0073]

[0074] from Figure 2 As can be seen from Table 3, a too low pushing speed may lead to uneven fiber diameter because the solution is not stretched sufficiently in the electric field; while a too high pushing speed may cause fiber breakage or droplet formation because the solution is stretched too quickly in the electric field and cannot form continuous fibers. Large area shadows indicate that the liquid discharge speed affects normal filamentation. When the liquid discharge speed is lower than 0.5 ml / h, the liquid discharge speed is too slow and does not match the spinning speed, resulting in uneven fiber thickness and low spinning efficiency. When the liquid discharge speed is close to 0.7 ml / h, the spinning solution drips onto the receiving device before being stretched and refined into fibers, resulting in some fibers not being fully stretched and refined, resulting in thick sections. In summary, the liquid discharge speed is selected as 0.5 ml / h.

[0075] During the electrospinning process, the size of the inner diameter of the needle has a significant effect on the fiber diameter and morphology. A smaller inner diameter of the needle can produce finer fibers, because when the droplets are ejected from a finer needle, their speed is faster and the atomization effect is better, which helps to prepare fibers with smaller diameters. At the same time, the thickness of the needle also determines the strength of the electric field, which in turn affects the breakage of the jet fluid and the stretching of the fiber. A thick needle can generate a stronger electric field, allowing the polymer to be ejected farther and thinner, further refining the diameter of the fiber; while a thin needle may generate a weaker electric field. Although the ability to eject polymers is weaker, the morphology of the fiber may be more regular. The effect of the size of the spinning needle on the morphology of the nanofiber membrane was detected. The spinning parameters are as follows: spinning voltage 20kV, receiving distance 12cm, spinning liquid push speed 0.5ml / h, and the size of the spinning needle are shown in Table 4:

[0076] Table 4 Spinning needle size

[0077]

[0078] As can be seen from Table 4, the fiber diameter under the 18G needle is the thickest and the standard deviation is small, so the 18G needle is selected.

[0079] From the above experiments, it can be seen that the voltage, liquid outlet speed and needle diameter will affect the morphology of the spinning membrane. The external morphology of the spinning membrane prepared with a voltage of 20kV, a liquid outlet speed of 0.5ml / h and an 18G needle is the best.

[0080] Example 3 Performance test of electrospun polymer solution cured aged silk fabric

[0081] Since ancient silk fabrics are cultural relics, it is impossible to directly test the curing conditions. Therefore, silk is used for aging simulation to replace ancient silk fabrics to determine the curing conditions.

[0082] Preparation of silk aging samples: Cut silk samples of 150mm x 150 mm and install them in the installation slot of the UV accelerated aging test chamber. Set the aging time to 165h, UVA-430, 365nm, and irradiance to 1.5W / m 2 , do not open it in the middle, and take out the silk sample for later use after finishing.

[0083] Reinforcement of the spinning membrane of the aged sample: Let the prepared electrospinning polymer solution stand for 2 hours before solution perfusion. First, inject the electrospinning polymer solution into a 10ml syringe, install the needle, exhaust the air in the syringe and the catheter, use the drum as the receiving device, and the aged silk as the receiving material. At room temperature, the spinneret mouth moves back and forth at a uniform speed, with a range of 10cm, so that the composite electrospinning membrane has a certain area to completely cover the aged sample. The spinning process maintains a push speed of 0.5ml / h, a voltage of 20kV, and a receiving distance of 12cm. After the spinning process lasts for 1h and 3h respectively, the reinforced aged silk is removed from the drum surface to obtain the reinforced aged sample.

[0084] 1. Test the tensile strength of normal silk and aged silk: Cut normal silk and aged silk into dumbbell-shaped samples respectively, prepare 5 parallel samples for each group of samples, first measure the thickness of the samples with a BK-3281 digital micrometer, and calculate the average thickness of normal silk and aged silk. The width of normal silk and aged silk is 2mm, and the tensile performance test is carried out using an Instron 3367 electronic universal testing machine. The clamp spacing of the Instron 3367 electronic universal testing machine is 10mm, and the clamp descent speed is set to 10mm / min. The stress-strain curve is obtained by processing the tension / (thickness*width) data, as shown in Figure 3 shown.

[0085] from Figure 3 It can be seen that the tensile strength of silk has been greatly reduced after aging, which can basically simulate the fragile state of cultural relics after being buried for a long time.

[0086] 2. Conduct tensile strength tests on aged silk without reinforcement and reinforced for 1h and 3h: Conduct tensile strength tests on aged silk without reinforcement and reinforced for 1h and 3h. Cut the samples into dumbbell-shaped samples. Prepare 5 parallel samples for each group of samples. First, measure the thickness of the fiber membrane with a BK-3281 digital micrometer and calculate the average thickness of the sample. The sample width is 2mm. The tensile performance test is conducted using an Instron 3367 electronic universal testing machine. The clamp spacing of the Instron 3367 electronic universal testing machine is 10mm, and the clamp descent speed is set to 10mm / min. The stress-strain curve is obtained by processing the tension / (thickness*width) data, as shown in Figure 4 shown.

[0087] from Figure 4 It can be seen that through the comparison of the tensile strength of aged silk before and after coating, it can be seen that the coating enhances the tensile strength and elongation at break of silk, and the mechanical properties improve with the increase of coating time.

[0088] 3. Peel strength test: The aged silk was flatly attached to the surface of tin foil as the receiving surface material for spinning, and the spinning time was controlled at 1h and 3h respectively. The test was carried out using an Instron 3367 electronic universal material testing machine. The film and the aged silk were clamped in the lower chuck, and the torn aged silk was clamped in the upper chuck. The force value during the peeling process was recorded using the corresponding software, such as Figure 5 shown.

[0089] from Figure 5 It can be seen that the maximum bonding force between the spinning membrane and the aged silk does not exceed 0.3N. The spinning membrane can be easily peeled off from the surface of the ancient silk fabric when needed. This is a reversible protection and will not cause permanent damage to the cultural relics. It provides more flexibility for the long-term protection and display of cultural relics.

[0090] 4. Changes in glycerol content on cured fiber strength:

[0091] When preparing the electrospinning polymer solution, the amount of glycerol added was set to 0 mL, 1 mL, 2 mL, and 3 mL, respectively, to detect the change of different glycerol contents on the strength of the spinning film. The spinning film was solidified for 3 hours on the aged silk using the above method.

[0092] Take the cured aged silk and use the Phenom desktop scanning electron microscope to test the fiber morphology. Stick the conductive glue on the table, take a trace sample and stick it on the conductive glue surface. After dust removal, load it into the electron microscope compartment to adjust the display screen. Filament material: 1500-hour tungsten wire. Acceleration voltage: 5kV. Resolution: better than 25nm. Vacuuming time: less than 15s. Manually adjust the focal length to control different samples at the same magnification. Take pictures after the screen shows that the fiber is completely clear. For the electron microscope pictures of samples with good spinning effects, use imagej software, set the scale range, and take 50 fibers at a certain proportion of the electron microscope picture for manual distance measurement. Calculate the average fiber width and standard deviation. The results are shown in Table 5.

[0093] Table 5 Statistical analysis of fiber diameters under different components and proportions

[0094]

[0095] As can be seen from Table 5, when the amount of glycerol added is 2 ml, the fiber diameter is the largest and the fiber is relatively uniform and complete as a whole, which is an ideal fiber property.

[0096] The tensile strength test was carried out using the above method, and the results are as follows Figure 6 As shown in the figure, the glycerol-PVA-1 group membrane is not strong enough to be fully tested for mechanical properties, so it cannot be shown in the figure. Figure 6 It can be seen that the overall strength of the membrane produced is greatly improved after a certain amount of glycerol is added to the solution, and the strength when the added amount is 2 ml is more suitable for subsequent reinforcement.

[0097] Therefore, at a voltage of 20kV, a spinning distance of 12cm and a liquid outlet rate of 0.5ml / h, water was used as the solvent, a small amount of ethanol was added, and polyvinyl alcohol (PVA) and silk fibroin (SF) were compounded to produce a composite membrane with excellent performance; further modified by glycerol, the addition of 2ml of glycerol can significantly improve the strength of the spinning membrane. The composite membrane on the surface of the direct-sprayed silk fabric was tested, and the stress and strain indicators of the mechanical properties of the simulated silk fabric aging sample were greatly improved after coating for 3h. The electrospinning membrane prepared by this polymer solution has good mechanical properties and adhesion, and can effectively improve the strength of ancient silk fabrics.

[0098] In addition to using desktop electrospinning machines to perform large-area spinning and coating on ancient silk fabrics, handheld electric electrospinning devices can also be used to coat and reinforce local damage to ancient silk fabrics.

[0099] It can be seen from the above examples that the electrospinning polymer solution provided by the present invention can effectively reinforce ancient silk fabrics, maintain their original shape and color, and extend their shelf life, thereby solving the problems of unsatisfactory reinforcement effect and secondary damage to cultural relics in the prior art.

[0100] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An electrospinning polymer solution for reinforcing ancient silk fabrics, characterized in that: Each electrospinning polymer solution consisted of the following ingredients: 15 ml of deionized water, 2.667 g of polyvinyl alcohol, 6.223 g of silk fibroin powder, 1 ml of ethanol, and 2 ml of glycerol.

2. The electrospinning polymer solution according to claim 1, characterized in that The polyvinyl alcohol is cold water soluble polyvinyl alcohol.

3. The electrospinning polymer solution according to claim 1 or 2, characterized in that: The polyvinyl alcohol is 1788 type polyvinyl alcohol.

4. The method for preparing an electrospinning polymer solution for reinforcing ancient silk fabrics according to any one of claims 1 to 3, characterized in that: The steps include: 1) dissolving silk fibroin powder in deionized water to prepare a silk fibroin solution; 2) adding polyvinyl alcohol particles to the silk fibroin solution, swelling at room temperature for 4 hours, and stirring to form a mixed solution; 3) The mixed solution was heated at 60° C. for 30 min to completely defoam the solution, and then glycerol and ethanol were added and stirred evenly to obtain an electrospinning polymer solution.

5. A method for reinforcing ancient silk fabrics using the electrospinning polymer solution according to any one of claims 1 to 3, characterized in that: The steps include: 1) Take a syringe barrel, connect a liquid guide tube, connect a stainless steel dispensing needle to the other end of the liquid guide tube, inject the electrospinning polymer solution into the syringe, and exhaust the air in the syringe and the liquid guide tube; 2) Lay the ancient silk fabric flat, fix the syringe to the electric electrospinning device, and make the spinneret at the end of the stainless steel dispensing needle face the ancient silk fabric and be 11-13 cm away from the ancient silk fabric; 3) At room temperature, the electrospinning device was started to spin on the ancient silk fabric to form a spinning membrane; during the spinning process, the syringe barrel push speed was maintained at 0.5 ml / h and the voltage was maintained at 20 kV.

6. The reinforcement method according to claim 5, characterized in that: The specification of the needle is 18G.

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