Antibacterial and insect-proof silk paper for calligraphy and painting and preparation method thereof

Abstract

The application provides antibacterial and insect-proof silk paper for calligraphy and painting and a preparation method thereof and relates to the technical field of papermaking. The method comprises the following steps: S1: placing flat plate silk in warm water, adding sodium dodecyl sulfate, urea and Ca(ClO)2, keeping warm and standing, stirring, adding NaOH, standing and rubbing, then taking out the flat plate silk, soaking and cleaning the flat plate silk with water, laying flat, and drying; S2: soaking the dried flat plate silk in an antibacterial and insect-proof liquid, taking out the flat plate silk, airing and drying, repeating the soaking and airing for 2-3 times, laying flat, and drying; S3: soaking the flat plate silk dried in step S2 in a whitening and softening liquid, then taking out the flat plate silk, laying flat, and drying; then spraying antibacterial nano capsules on one side or both sides of the flat plate silk, and drying, so that the silk paper is obtained. The silk paper prepared by the method has high whiteness, is beneficial to storage, and has antibacterial and anticorrosive properties.

Description

TECHNICAL FIELD

[0001] The present application relates to the papermaking technical field, and in particular to an antibacterial and mothproof silk paper for calligraphy and painting and a preparation method thereof. BACKGROUND

[0002] The silk paper is a kind of precious handmade paper in the Jin Dynasty, which is woven by silkworms through self-silk spinning and edge locking. The paper is soft in texture, warm and jade-like in color, and has a 360-degree silk luster effect on the surface. The paper is not easy to be soaked and infiltrated when it is dropped into water. The fibers are coherent and not easy to be damaged. The sericin can prevent corrosion, moisture and oxidation, and the preservation time is 2-3 times of that of xuan paper.

[0003] The preparation steps of the silk paper mainly include: degumming, bleaching and drying of the silk raw material to remove impurities and sericin and improve the purity and softness of the fibers. Then the treated silk fibers are beaten into pulp, and then the fibers are uniformly distributed on the paper surface through the papermaking process to form the paper. The finished paper is subjected to post-processing such as calendering and finishing to improve the gloss and flatness of the paper. Another preparation method is to directly use flat silk as raw material, use a soap alkali degumming solution, degum at 55-98℃, retain 20-30% sericin, dry at 60-70℃, and then roll with a uniform diameter wooden stick or iron rod to make the texture compact.

[0004] However, the fibers of the flat silk are adhered by sericin, and when the degumming rate exceeds 70%, the adhesion between the silk fibers is damaged, the silk is loose, disordered and layered, and finally forms a fluffy structure similar to a silk quilt, which cannot be used for writing. In the rolling and rolling process, the floating silk on the surface of the silk paper will be wound and adhered to the roller, tearing the silk paper into pieces, bringing more floating hair and forming more fluffy texture, which greatly affects the appearance and yield of the silk paper. In addition, silk is composed of animal protein, which is prone to bacterial and mold growth. The existing silk paper preparation methods do not have antibacterial and mold-proof treatment, which is not conducive to the transmission of precious calligraphy works. SUMMARY

[0005] The present application provides a preparation method of an antibacterial and mothproof silk paper for calligraphy and painting, which has antibacterial and antiseptic properties and high whiteness.

[0006] Another object of the present application is to provide an antibacterial and mothproof silk paper for calligraphy and painting, which has high whiteness and is easy to store.

[0007] The technical problem of the present application is solved by using the following technical scheme.

[0008] In one aspect, the present application provides a preparation method of an antibacterial and mothproof silk paper for calligraphy and painting, comprising the following steps:

[0009] S1: Put the flat plate silk in warm water, add sodium dodecyl sulfate, urea, Ca(ClO)2, incubate and stand, stir, add NaOH, stand and knead, then the flat plate silk is fished up, soaked and washed with water for 3-5 times, laid flat, and naturally dried;

[0010] S2: The dried flat plate silk is soaked in the antibacterial and insect repellent liquid, fished up and dried, repeated for 2-3 times, laid flat and dried.

[0011] S3: The dried flat plate silk in step S2 is soaked in the whitening and softening liquid, then fished up, laid flat and dried, then one side or both sides are sprayed with antibacterial nano capsules and dried, to obtain the silk paper.

[0012] In the present application, the flat plate silk is used as raw material, which has a fiber structure intertwined with each other. In order to better control the thickness of the paper, the silk spinning stage needs to be controlled, and subsequent processing should avoid artificial tearing as much as possible to reduce the generation of floating silk.

[0013] In step S1, sodium dodecyl sulfate (SDS) is added as a protein protective agent, which can reduce the cracking of sericin by urea, Ca(ClO)2 and NaOH, thereby increasing the protein molecular weight in the silk paper. During incubation and standing, sericin can be fully swelled, then gently stirred for 10 minutes, which can remove the yellowish undertone on the surface of the silk paper. For the key stained parts, gently knead with more gentle force. For stubborn stains such as silkworm blood and silkworm urine, knead after 3 minutes of NaOH soaking, which can wash off the stubborn stains on the silk paper.

[0014] During the preparation process, the flat laying and natural drying method is used, without using wooden sticks, iron rods, rolling machines and other methods for flattening treatment, which greatly reduces the floating hair on the surface of the silk paper, increases the smoothness and flatness of the paper.

[0015] In some embodiments of the present application, the insect repellent and antibacterial liquid comprises the following raw materials by weight:

[0016] 30-80 parts of Melia azedarach bark powder, 10-15 parts of wormwood fluff, 10-20 parts of peppermint powder, 20-40 parts of dispersed rosin gum, 700-900 parts of 95% ethanol by volume, 300-400 parts of pure water, and 20-80 parts of activated carbon.

[0017] The insect repellent and antibacterial liquid contains many insect repellent and bactericidal components such as azadirachtin, wormwood flavones and peppermint essential oil, which is natural, environmentally friendly, has good antibacterial and bacteriostatic effect, and can penetrate the silk protein deep after multiple soaking. The embedding effect of crystalline protein can realize the slow release of antibacterial and insect repellent substances, which can protect the silk paper from bacteria, mold, insects and mice for a long time during storage, greatly improving the storage time of silk paper paintings.

[0018] In some embodiments of the present application, the insect-resistant and antibacterial liquid is prepared by the following method:

[0019] The remaining raw materials except activated carbon are mixed uniformly at 45-55℃, and after stirring for 6-18h, they are filtered with 60-mesh, 100-mesh and 200-mesh filter screens in sequence. Then activated carbon is added to the filtrate, which is stirred uniformly and filtered with 60-mesh, 100-mesh and 200-mesh filter screens in sequence. The collected filtrate is the insect-resistant and antibacterial liquid. The insect-resistant and antibacterial liquid of the present application is derived from natural plant ingredients, prepared by a green method, and is an antibacterial, insect-resistant and natural plant extract. The ethanol content of the extract is higher than 70%, and the soaking process can effectively kill harmful bacteria attached to the paper and feeding on silk. After activated carbon adsorption treatment, the extract has lighter color and fewer impurities, which is beneficial to the improvement of the whiteness of the silk paper.

[0020] In some embodiments of the present application, the above-mentioned whitening and softening liquid comprises a glycerol aqueous solution with a volume fraction of 5-20% and TiO2 nano powder with a concentration of 5-25g / L. The TiO2 nano powder can effectively eliminate the yellow-brown color generated by the antibacterial and insect-resistant liquid, and make the silk paper bright and clean. The glycerol can make the sericin protein in the silk paper swell into spherical shape, and significantly increase the water content and water absorption of the silk paper.

[0021] In some embodiments of the present application, the particle size of the above-mentioned TiO2 nano powder is less than 100nm.

[0022] In some embodiments of the present application, in the step S1, the concentration of urea is 1-8mol / L, the concentration of Ca(ClO)2 is 1-5% w / v, and the mass fraction of NaOH is 2-5%.

[0023] In some embodiments of the present application, in the step S1, the temperature of the warm water is 45-55℃, and the time for incubation and standing is 3-5h. Under the mild conditions at 45-55℃, the degumming is carried out, and the sericin retention rate in the silk paper reaches more than 70%. Without damaging the original silk fiber bonding, the sericin on the surface layer adhered with silkworm urine and pupal oil can be effectively removed. More than 70% of sericin can be retained in the silk paper after degumming treatment. When the silk paper is laid flat and stood during airing, the large amount of swelled sericin acts as an adhesive to firmly fix the surface floating silk and the silk paper on the surface of the silk paper, thereby reducing the floating hair of the silk paper.

[0024] The preparation method of the antibacterial nano-capsule comprises the following steps:

[0025] CO-40 (solubilizer, hydrogenated castor oil polyoxyethylene ether), Span-80 (Span 80) and 1,2-propanediol are uniformly mixed to obtain an emulsifier A;

[0026] The two are uniformly mixed according to a mass ratio of emulsifier A: plant essential oil = 7:3, stirred at 30°C for 20 min, to obtain a mixed solution;

[0027] Subsequently, a chitosan aqueous solution with a mass fraction of 1% is added dropwise into the mixed solution until the solution is clear and transparent, and stirred for 30 min, to obtain liquid antibacterial nano-capsules,

[0028] The total mass of CO-40 and Span-80: the mass of 1,2-propanediol = 3:1. The plant essential oil can be peppermint essential oil or lavender essential oil.

[0029] On the other hand, the embodiment of the present application provides an antibacterial and mothproof silk paper for calligraphy and painting, which is prepared by the above method.

[0030] Compared with the prior art, the embodiment of the present application has at least the following advantages or beneficial effects:

[0031] The preparation method provided in the present application uses the decontamination ability of an anionic surfactant, adopts SDS as a protective agent, and removes sericin without adding a soap lye and in warm water, so that the sericin retention rate in flat silk reaches more than 70%, and the sericin adhered to the surface layer of the silk is removed without destroying the original bonding of the silk fibers. The overall whiteness of the silk paper can be effectively improved, and the yellow spots and traces of silkworm blood are removed, while the original structure of the silk paper fibers is retained, and the generation of floating hairs is reduced. Secondly, the degumming wastewater has a neutral pH value, contains a large amount of urea, a small amount of sericin protein, a small amount of wax, and a small amount of mineral elements, is an environmentally friendly and pollution-free water fertilizer, and can be directly discharged to farmland for use as a nitrogen fertilizer after dilution.

[0032] In the present application, the antibacterial and antiseptic liquid using natural plant ingredients has an ethanol content of more than 70%, and the flat silk can effectively kill harmful bacteria attached to the silk during the soaking process. After active carbon adsorption treatment, the obtained extraction liquid has a lighter color and fewer impurities, which is beneficial to improve the whiteness of the silk paper. Secondly, the 70% macromolecular sericin protein retained on the silk paper is fully water-absorbed and grown under the excitation of the glycerol aqueous solution, which significantly increases the ink absorption and water retention of the paper. During writing, the spherical sericin protein quickly absorbs water and swells with the penetration of glycerol, and the carbon particles in the ink are adsorbed on the surface of the protein. During drying, the sericin protein shrinks after dehydration, and a large number of protein wrinkles and grooves are generated, which firmly lock the carbon particles inside the protein, and the ink marks are not easy to fade and discolor. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. Other related drawings can also be obtained by those of ordinary skill in the art without creative labor on the basis of these drawings.

[0034] Figure 1 A comparison chart of flat plate silk before and after cleaning in the embodiments of the present application;

[0035] Figure 2 A comparison chart of gloss of flat plate silk and silk paper after cleaning in the embodiments of the present application;

[0036] Figure 3 A comparison chart of surface floating hair of flat plate silk and silk paper after cleaning in the embodiments of the present application;

[0037] Figure 4 A comparison chart of surface wrinkles of flat plate silk and silk paper after cleaning in the embodiments of the present application;

[0038] Figure 5 A picture of a silk paper Chinese painting work in the embodiments of the present application;

[0039] Figure 6 A picture of a silk paper calligraphy painting work in the embodiments of the present application;

[0040] Figure 7 A picture of the insect-proof and antibacterial liquid in embodiments 1-3. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described as follows. The specific conditions not mentioned in the embodiments are carried out according to the conventional conditions or the conditions suggested by the manufacturers. The reagents or instruments not mentioned by the manufacturers are all conventional products that can be purchased in the market.

[0042] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to specific embodiments.

[0043] The features and properties of the present application will be further described in detail below with reference to the embodiments.

[0044] Embodiment 1

[0045] 1. Preparation of insect-proof and antibacterial liquid

[0046] Mix 50 parts of Melia azedarach bark powder, 10 parts of wormwood fluff, 10 parts of peppermint powder, 40 parts of dispersed rosin colophony, 900 parts of 95% ethanol, and 400 parts of pure water, and stir rapidly at 50°C for 10 hours to dissolve natural antibacterial and insect-repellent compounds such as meliatoxin, wormwood flavones, and peppermint essential oil in the ethanol aqueous solution. Then filter successively using 60-mesh, 100-mesh, and 200-mesh filter screens, and add 80 parts of activated carbon powder to the filtrate to adsorb pigments, macromolecular polysaccharides, and soluble proteins. Filter successively using 60-mesh, 100-mesh, and 200-mesh filter screens, and the obtained filtrate is the antibacterial and insect-repellent liquid.

[0047] 2. Preparation of whitening and softening liquid

[0048] Prepare a glycerol aqueous solution with a volume fraction of 10%, and add TiO2 nanopowder with an average particle size of 80 nm to make the concentration of TiO2 nanopowder 10 g / L, and stir uniformly to obtain the whitening and softening liquid.

[0049] 3. Preparation of antibacterial nanocapsules

[0050] Mix CO-40 (hydrogenated castor oil polyoxyethylene ether), Span-80 (sorbitan monooleate), and 1,2-propanediol uniformly to obtain emulsifier A;

[0051] Mix the emulsifier A and the plant essential oil (lavender essential oil) uniformly at a mass ratio of 7:3, stir at 30°C for 20 min, and obtain a mixed solution;

[0052] Then, add a chitosan aqueous solution with a mass fraction of 1% dropwise into the mixed solution until the solution is clear and transparent, and stir for 30 min to obtain the liquid antibacterial nanocapsules.

[0053] The total mass of CO-40 and Span-80: the mass of 1,2-propanediol = 3:1.

[0054] 4. The silk paper of the present embodiment is prepared as follows:

[0055] S1: By controlling the number of silkworms and the silk spinning time, a flat plate of silk with a suitable thickness is obtained. The flat plate of silk is placed in warm water at 50°C, and sodium dodecyl sulfate (SDS), urea, and Ca(ClO)2 are added. After incubation and standing for 4 h, the mixture is stirred for 10 min. The yellowish background color on the flat plate of silk is removed, and the key stained parts are rubbed gently. Then, NaOH is added, and after standing for 3 min, the mixture is rubbed to remove stubborn stains on the flat plate of silk. Then, the flat plate of silk is lifted and soaked in water for cleaning 5 times, and is laid flat on a drying table for natural drying. In the soaking solution system, the concentration of urea is 2 mol / L, the concentration of Ca(ClO)2 is 2% w / v, and the mass fraction of NaOH is 5%.

[0056] S2: The dried flat plate silk is soaked in the antibacterial and insect repellent liquid for 15 min, taken out and laid flat to dry, and the soaking-drying process is repeated twice, and then laid flat and dried.

[0057] S3: The flat plate silk after drying in step S2 is soaked in the whitening and softening liquid, then taken out, laid flat and dried, and then one side is sprayed with antibacterial nano-capsules and dried to obtain the silk paper.

[0058] Example 2

[0059] 1. Preparation of the antibacterial and insect repellent liquid

[0060] 30 parts of Melia azedarach bark powder, 15 parts of wormwood fluff, 20 parts of peppermint powder, 30 parts of dispersed colophony, 900 parts of 95% ethanol, and 400 parts of pure water are mixed, and stirred rapidly at 50°C for 10 hours, so that natural antibacterial and insect repellent compounds such as meliatoxin, wormwood flavones, and peppermint essential oil are fully dissolved in the ethanol aqueous solution. Then, the solution is filtered with 60-mesh, 100-mesh, and 200-mesh filter screens in sequence, 70 parts of activated carbon powder is added to the filtrate, and stirred uniformly, and then filtered with 60-mesh, 100-mesh, and 200-mesh filter screens in sequence. The obtained filtrate is the antibacterial and insect repellent liquid.

[0061] 2. Preparation of the whitening and softening liquid

[0062] A glycerol aqueous solution with a volume fraction of 20% is prepared, and TiO2 nano-powder with an average particle size of 80 nm is added to make the concentration of TiO2 nano-powder 25 g / L, and stirred uniformly to obtain the whitening and softening liquid.

[0063] 3. The silk paper of the present example is prepared as follows:

[0064] S1: The flat plate silk with a suitable thickness is obtained by controlling the number of silkworms and the silk spinning time, and the flat plate silk is placed in warm water at 50°C, and sodium dodecyl sulfate (SDS), urea, and Ca(ClO)2 are added, and then incubated and placed for 4 hours, and stirred for 10 minutes. The yellowish background color on the flat plate silk is removed, and the key stained parts are rubbed gently. NaOH is added, and then placed for 3 minutes and rubbed to remove stubborn stains on the flat plate silk. Then, the flat plate silk is taken out, soaked and washed with water for 5 times, laid flat on a drying table, and naturally dried. In the soaking solution system, the concentration of urea is 2 mol / L, the concentration of Ca(ClO)2 is 2% w / v, and the mass fraction of NaOH is 5%.

[0065] S2: The dried flat plate silk is soaked in the antibacterial and insect repellent liquid for 15 min, taken out and laid flat to dry, and the soaking-drying process is repeated twice, and then laid flat and dried.

[0066] S3: The flat silk after drying in step S2 is soaked in the whitening and softening solution, then taken out, laid flat, and dried. Then one side is sprayed with the antibacterial nano-capsule of Example 1, and dried to obtain the silk paper.

[0067] Example 3

[0068] 1. Preparation of the antibacterial and insect-repellent solution

[0069] 80 parts of Melia azedarach bark powder, 10 parts of wormwood fluff, 15 parts of peppermint powder, 20 parts of dispersed rosin colloid, 800 parts of 95% ethanol, and 400 parts of pure water are mixed, and stirred rapidly at 45°C for 10 hours, so that natural antibacterial and insect-repellent compounds such as azedarchin, wormwood flavones, and peppermint essential oil are fully dissolved in the ethanol aqueous solution. Then, the solution is filtered using 60-mesh, 100-mesh, and 200-mesh filter screens in sequence, and the filtrate is added with 80 parts of activated carbon powder. After stirring uniformly, the mixture is filtered using 60-mesh, 100-mesh, and 200-mesh filter screens in sequence, and the obtained filtrate is the antibacterial and insect-repellent solution.

[0070] 2. Preparation of the whitening and softening solution

[0071] A glycerol aqueous solution with a volume fraction of 20% is prepared, and TiO2 nano-powder with an average particle size of 80 nm is added to make the concentration of the TiO2 nano-powder 25 g / L, and then stirred uniformly to obtain the whitening and softening solution.

[0072] 3. The silk paper of the present example is prepared as follows:

[0073] S1: Flat silk with a suitable thickness is obtained by controlling the number of silkworms and the silk spinning time. The flat silk is placed in warm water at 50°C, and sodium dodecyl sulfate (SDS), urea, and Ca(ClO)2 are added. After incubation and standing for 4 h, the mixture is stirred for 10 min. The yellowish background color on the flat silk is removed, and the parts with stubborn stains are rubbed gently. Then, NaOH is added, and after standing for 3 min, the mixture is rubbed to remove the stubborn stains on the flat silk. Then, the flat silk is taken out, soaked and washed with water for 5 times, laid flat on a drying table, and naturally dried. In the soaking solution system, the concentration of urea is 2 mol / L, the concentration of Ca(ClO)2 is 2% w / v, and the mass fraction of NaOH is 5%.

[0074] S2: The flat silk after drying is soaked in the antibacterial and insect-repellent solution for 15 min, taken out, laid flat, and dried. The soaking and drying is repeated twice, and then the flat silk is laid flat and dried.

[0075] S3: The flat silk after drying in step S2 is soaked in the whitening and softening solution, then taken out, laid flat, and dried. Then one side is sprayed with the antibacterial nano-capsule of Example 1, and dried to obtain the silk paper.

[0076] Example 4

[0077] The difference from example 1 is that, in this example, in step S1, the concentration of urea is 8 mol / L, the concentration of Ca(ClO)2 is 5% w / v, and the mass fraction of NaOH is 5%. The rest is the same as example 1.

[0078] Example 5

[0079] The difference from example 1 is that, in this example, in step S1, the concentration of urea is 1 mol / L, the concentration of Ca(ClO)2 is 1% w / v, and the mass fraction of NaOH is 2%. The rest is the same as example 1.

[0080] Comparative example 1

[0081] The difference from example 1 is that, in this example, no anti-bacterial and insect-proof liquid is used for soaking treatment, and the rest of the steps are the same as example 1.

[0082] Comparative example 2

[0083] The difference from example 1 is that, in this example, no whitening and softening liquid is used for soaking treatment, and the rest of the steps are the same as example 1.

[0084] Comparative example 3

[0085] The difference from example 1 is that, in this example, no anti-bacterial nano-capsule is used, and the rest of the steps are the same as example 1.

[0086] Experimental example

[0087] The silk paper of examples 1-5 and comparative examples 1-3 is used as the test object, and the sericin content and antibacterial property of each silk paper are detected, and the results are shown in table 1.

[0088] Table 1

[0089]

[0090]

[0091] In summary, the silk paper provided by the examples of the present application has high sericin content, good antibacterial property, and is not easy to fade and discolor.

[0092] From the attached Figures 2-4 It can be seen that the silk paper obtained after step 2 and step 3 treatment has smooth surface, luster and no floating hair, which meets the writing requirements.

[0093] The embodiments described above are only part of the embodiments of the present application, rather than all the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but only to represent selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

Claims

1. A method for preparing an antibacterial and insect-proof silk paper for calligraphy and painting, characterized in that, It comprises the following steps: S1: Put the flat plate silk in warm water, add sodium dodecyl sulfate, urea, Ca(ClO)2, incubate and stand, stir; then add NaOH, stand and knead, then lift the flat plate silk, soak and clean with water, lay flat, dry; The concentration of urea is 2 mol / L, the concentration of Ca(ClO)2 is 2% w / v, and the mass fraction of NaOH is 5%; S2: Soak the dried flat plate silk in the antibacterial and insect-proof liquid, lift and dry, repeat soaking-drying 2-3 times, then lay flat and dry; S3: Soak the flat plate silk dried in step S2 in the whitening and softening liquid, then lift, lay flat and dry; then spray antibacterial nano capsules on one side or both sides and dry, to obtain the silk paper; The antibacterial and insect-proof liquid comprises the following raw materials by weight fraction: 30-80 parts of Melia azedarach bark powder, 10-15 parts of wormwood fluff, 10-20 parts of mint powder, 20-40 parts of dispersed rosin gum, 700-900 parts of 95% ethanol, 300-400 parts of pure water, and 20-80 parts of activated carbon; The antibacterial and insect-proof liquid is prepared by the following method: Mix the remaining raw materials except activated carbon uniformly at 45-55℃, stir for 6-18h, then filter with 60 mesh, 100 mesh and 200 mesh filter screens in sequence, add activated carbon to the filtrate, stir uniformly, then filter with 60 mesh, 100 mesh and 200 mesh filter screens in sequence, and collect the filtrate, which is the antibacterial and insect-proof liquid; The preparation of antibacterial nano capsules comprises the following steps: Mix hydrogenated castor oil polyoxyethylene ether, Span 80 and 1,2-propanediol uniformly to obtain emulsifier A; Mix the two uniformly according to a mass ratio of emulsifier A: plant essential oil = 7:3, stir at 30℃ for 20min to obtain a mixed solution; Then add 1% chitosan aqueous solution dropwise into the mixed solution until the solution is clear and transparent, and stir for 30min to obtain liquid antibacterial nano capsules; The total mass of hydrogenated castor oil polyoxyethylene ether and Span 80: the mass of 1,2-propanediol = 3:1; The preparation of the whitening and softening liquid comprises the following steps: Prepare a glycerol aqueous solution with a volume fraction of 5-10%, then add TiO2 nano powder to make the concentration of TiO2 nano powder 5-25 g / L, and stir uniformly to obtain the whitening and softening liquid.

2. The method for preparing antibacterial and insect-resistant silk paper for calligraphy and painting according to claim 1, characterized in that, The particle size of the TiO2 nano powder is less than 100nm.

3. The method for preparing antibacterial and insect-resistant silk paper for calligraphy and painting according to claim 1, characterized in that, In step S1, the temperature of the warm water is 45-55℃, and the incubation and standing time is 3-5h.

4. The method for preparing antibacterial and insect-resistant silk paper for calligraphy and painting according to claim 1, characterized in that, In step S2, the soaking time in the antibacterial and insect-proof liquid is 10-20min, and the temperature of the antibacterial and insect-proof liquid is 20-30℃.

5. An antibacterial and insect-repellent silk paper for calligraphy and painting, characterized in that, Prepared by the method of any one of claims 1-4.

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