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

Abstract

The invention provides antibacterial and insect-proof silk paper for calligraphy and painting and a preparation method of the antibacterial and insect-proof silk paper, and relates to the technical field of papermaking. Comprising the following steps: S1, putting flat silk into warm water, adding lauryl sodium sulfate, urea and Ca (ClO) 2, preserving heat, standing and stirring; then adding NaOH, standing and rubbing, then fishing out the flat silk, soaking and cleaning with water, spreading and drying; s2, soaking the dried flat silk in an antibacterial insect-resistant solution, fishing out and airing, repeatedly soaking and airing for 2-3 times, paving, and drying; s3, soaking the flat silk dried in the step S2 in a whitening and softening solution, and then fishing out, flatly laying and drying; and then spraying antibacterial nanocapsules on one or two surfaces of the silk paper, and drying to obtain the silk paper. The silk paper prepared by the method is high in white cleanliness and beneficial to storage, and has antibacterial and corrosion-resistant properties.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking, and in particular to antibacterial and insect-proof silk paper for calligraphy and painting and a preparation method thereof. Background Art

[0002] Silk paper is a kind of precious handmade paper in the Jin Dynasty. It is woven into a flat sheet of silk paper by the self-spinning and lock-edging of silkworms. The paper is soft in texture, as warm and smooth as jade, with crisscrossing textures and a 360° mercerized effect on the surface. When it encounters water drops, it forms a deep mortar shape and is not easy to penetrate. The fibers are continuous and not easy to be damaged. The sericin is anti-corrosive, moisture-proof and anti-oxidant, and the shelf life is 2-3 times that of Xuan paper.

[0003] The preparation steps of silk paper mainly include: degumming, bleaching, drying and other treatments of silk raw materials to remove impurities and sericin and improve the purity and softness of the fiber. Then the treated silk fibers are beaten into pulp, and then the fibers are evenly distributed on the paper surface through the papermaking process to form paper. The paper is subjected to post-processing processes 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 soap alkali degumming liquid, degumming in an environment of 55℃-98℃ in turn, retaining 20%-30% of sericin, and then drying at a temperature of 60℃-70℃. After flattening, it is rolled with a wooden stick or iron rod of uniform thickness to make the texture tight.

[0004] However, the fibers of flat silk are adhered to each other by sericin. When the degumming rate exceeds 70%, the bonding between the silk fibers will be destroyed, making the silk loose, disordered, and layered, and eventually forming a fluffy structure similar to a silk quilt, which is completely unusable for writing. In addition, during the rolling and rolling process, the floating silk on the surface of the silk paper will be entangled and adhered to the roller, tearing the silk paper into pieces, bringing up more floating hairs, and forming more flocculent textures, which greatly affects the beauty and yield of the silk paper. Furthermore, silk is composed of animal protein, which is very easy to breed bacteria and mold. The existing silk paper preparation methods do not have antibacterial and mildew-proof treatments, which is not conducive to the inheritance of precious calligraphy works. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing antibacterial and insect-proof silk paper for calligraphy and painting, which has the characteristics of antibacterial, anticorrosive and high whiteness.

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

[0007] The present invention solves the technical problem by adopting the following technical solutions.

[0008] On the one hand, an embodiment of the present invention provides a method for preparing antibacterial and insect-proof silk paper for painting and calligraphy, comprising the following steps:

[0009] S1: Place the flat silk in warm water, add sodium dodecyl sulfate, urea, and Ca(ClO)2, keep it warm and let it stand, stir, add NaOH, let it stand and then rub it, then pick up the flat silk, soak it in water and wash it 3-5 times, lay it flat, and dry it naturally;

[0010] S2: soak the dried silk in an antibacterial and insect repellent solution, pick it up and air dry it, repeat the soaking and air drying process 2-3 times, and then lay it flat and dry it;

[0011] S3: soaking the flat silk after drying in step S2 in a whitening and softening liquid, then picking it up, spreading it flat and drying it; then spraying antibacterial nanocapsules on one or both sides of it, and drying it to obtain the silk paper.

[0012] In the present invention, flat silk is used as raw material, which has an intertwined fiber structure. In order to better control the thickness of the paper, it is necessary to control it during the silkworm spinning stage, and subsequent processing should try to avoid artificial tearing to reduce the generation of floating silk.

[0013] In step S1, sodium dodecyl sulfate (SDS) is added as a protein protective agent to reduce the cleavage of sericin by urea, Ca(ClO)2 and NaOH, thereby increasing the protein molecular weight in silk paper. When kept warm and standing, sericin can fully swell, and then gently agitate for 10 minutes to remove the slightly yellowish background on the surface of the silk paper. The key stains are rubbed with relatively gentle force. For stubborn stains such as silkworm blood and urine, soak in NaOH for 3 minutes and then rub to wash off the stubborn stains on the silk paper.

[0014] During the preparation process, the silk paper is laid flat and dried naturally without using wooden sticks, iron bars, rollers, etc. for flattening. This greatly reduces the floating hair on the surface of the silk paper and increases the smoothness and flatness of the paper.

[0015] In some embodiments of the present invention, the insect-proof and antibacterial liquid comprises the following raw materials in parts by weight:

[0016] 30-80 parts of chinaberry bark powder, 10-15 parts of wormwood wool, 10-20 parts of mint powder, 20-40 parts of dispersed rosin glue, 700-900 parts of 95% ethanol by volume, 300-400 parts of purified water and 20-80 parts of activated carbon.

[0017] The insect-proof and antibacterial liquid contains a variety of insect-proof and bactericidal ingredients such as azadirachtin, flavonoids, and peppermint essential oil. It is natural and environmentally friendly, with good antibacterial and antifungal effects. After multiple soakings, the antibacterial and insect-proof substances can penetrate deep into the silk protein. The embedding effect of the crystalline protein can achieve the slow release of antibacterial and insect-proof substances, which can protect silk paper from the harm of bacteria, mold, moths and mice during the storage process for a long time, greatly prolonging the storage time of silk paper calligraphy and painting works.

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

[0019] At 45-55°C, the remaining raw materials except activated carbon are mixed evenly, stirred for 6-18 hours, filtered with 60 mesh, 100 mesh, and 200 mesh filters in turn, activated carbon is added to the filtrate, stirred evenly, and filtered with 60 mesh, 100 mesh, and 200 mesh filters in turn, and the filtrate is collected to obtain the insect-proof and antibacterial liquid. The insect-proof and antibacterial liquid of the present invention, its raw materials are derived from natural plant components, and a green preparation method is adopted to obtain an antibacterial, insect-proof, 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 paper that feed on silk. After the activated carbon adsorption treatment, the obtained extract is lighter in color and has fewer impurities, which is conducive to improving the whiteness of silk paper.

[0020] In some embodiments of the present invention, the whitening and softening liquid comprises a glycerol aqueous solution with a volume fraction of 5-20% and a TiO2 nanopowder of 5-25 g / L. The TiO2 nanopowder can effectively eliminate the yellow-brown color produced by the antibacterial and insect-proof liquid, making the silk paper smooth and white, and the glycerol can swell the sericin in the silk paper into a spherical shape, significantly increasing the moisture content and water absorption of the silk paper.

[0021] In some embodiments of the present invention, the particle size of the TiO2 nanopowder is less than 100 nm.

[0022] In some embodiments of the present invention, in the above step S1, the concentration of urea is 1-8 mol / 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 invention, in the above step S1, the temperature of the warm water is 45-55°C, and the heat preservation and standing time is 3-5h. Degumming is carried out under mild conditions at 45-55°C, and the retention rate of sericin in silk paper reaches more than 70%. Without destroying the original silk fiber bonding, the sericin on the surface stained with silkworm urine and pupa oil can be effectively removed. More than 70% of sericin can be retained in the silk paper after degumming. When drying, the silk paper is laid flat and stood still. A large amount of swollen sericin acts as an adhesive to firmly fix the surface floating silk and silk paper on the surface of the silk paper, reducing the floating hair of the silk paper.

[0024] The preparation method of antibacterial nanocapsules comprises the following steps:

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

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

[0027] Then, a chitosan aqueous solution with a mass fraction of 1% was added dropwise into the mixed solution until the solution became clear and transparent, and stirred for 30 minutes to obtain liquid antibacterial nanocapsules.

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

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

[0030] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0031] The preparation method provided in the present application utilizes the decontamination ability of anionic surfactants, uses SDS as a protective agent, and degumming is performed in warm water without adding soap alkali solution. The retention rate of sericin in flat silk reaches more than 70%, and the sericin stained with silkworm urine and pupa oil on the surface is removed without destroying the bonding of the original silk fibers. It can effectively improve the overall whiteness of silk paper, remove yellow spots and traces of silkworm blood, and at the same time retain the original structure of silk paper fibers and reduce the generation of floating hair. Secondly, the pH value of the degumming wastewater is neutral, which contains a large amount of urea, a small amount of sericin protein, trace amounts of wax and mineral elements. It is an environmentally friendly and pollution-free water fertilizer, which can be directly discharged to farmland as a nitrogen fertilizer after dilution.

[0032] In the present application, an antibacterial preservative liquid with natural plant ingredients is used, and its ethanol content is higher than 70%. Flat silk can effectively kill harmful bacteria attached to silk and feeding on silk during the soaking process. After activated carbon adsorption treatment, the obtained extract is lighter in color and has fewer impurities, which is beneficial to improve the whiteness of silk paper. Secondly, the 70% macromolecular sericin retained on the silk paper fully absorbs water and grows under the stimulation of glycerol aqueous solution, which significantly increases the ink absorption and water retention of the paper. When writing, the spherical sericin quickly absorbs water and moisturizes with the help of the penetration of glycerol, and adsorbs the carbon particles in the ink on the surface of the protein. When drying, the sericin dehydrates and shrinks, producing a large number of protein wrinkles and gullies, which firmly lock the carbon particles inside the protein, and the ink is not easy to fade or discolor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is a comparison diagram of the flat silk before and after cleaning according to an embodiment of the present invention;

[0035] Figure 2 This is a comparison chart of the glossiness of flat silk and silk paper after cleaning in an embodiment of the present invention;

[0036] Figure 3 This is a comparison diagram of the floating hair on the surface of flat silk and silk paper after cleaning in an embodiment of the present invention;

[0037] Figure 4 This is a comparison of the wrinkles on the surface of flat silk and silk paper after washing in an embodiment of the present invention;

[0038] Figure 5 It is a picture of a traditional Chinese painting on silk paper in an embodiment of the present invention;

[0039] Figure 6 This is a picture of a calligraphy and painting work on silk paper in an embodiment of the present invention;

[0040] Figure 7 This is a real picture of the insect repellent and antibacterial liquid of Examples 1-3. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to specific embodiments.

[0043] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0044] Example 1

[0045] 1. Preparation of insect repellent and antibacterial solution

[0046] Mix 50 parts of neem bark powder, 10 parts of wormwood wool, 10 parts of mint powder, 40 parts of dispersed rosin glue, 900 parts of 95% ethanol, and 400 parts of purified water, and stir rapidly for 10 hours at 50°C to fully dissolve natural antibacterial and insect repellent compounds such as azadirachtin, wormwood flavonoids, and mint essential oil in the ethanol aqueous solution. Then filter using 60-mesh, 100-mesh, and 200-mesh filters in turn, and add 80 parts of activated carbon powder to the filtrate to adsorb pigments, macromolecular polysaccharides, and soluble proteins. Filter using 60-mesh, 100-mesh, and 200-mesh filters in turn, and the resulting filtrate is the antibacterial and insect repellent liquid.

[0047] 2. Prepare whitening and softening liquid

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

[0049] 3. Preparation of Antibacterial Nanocapsules

[0050] CO-40 (hydrogenated castor oil polyoxyethylene ether), Span-80 (Span 80) and 1,2-propylene glycol were uniformly mixed to obtain emulsifier A;

[0051] The two were uniformly mixed in a mass ratio of emulsifier A to plant essential oil (lavender essential oil) = 7:3, and stirred at 30° C. for 20 min to obtain a mixed solution;

[0052] Subsequently, a chitosan aqueous solution with a mass fraction of 1% was added dropwise into the mixed solution until the solution became clear and transparent, and stirred for 30 minutes to obtain liquid antibacterial nanocapsules.

[0053] Among them, the total mass of CO-40 and Span-80: the mass of 1,2-propylene glycol = 3:1.

[0054] 4. Prepare the silk paper of this embodiment as follows:

[0055] S1: By controlling the number of silkworms and the spinning time, flat silk with appropriate thickness is obtained. The flat silk is placed in warm water at 50°C, and sodium dodecyl sulfate (SDS), urea, and Ca(ClO)2 are added. After being kept warm and allowed to stand for 4 hours, it is stirred for 10 minutes. The slightly yellowish background on the flat silk is removed, and the key stained parts are rubbed with relatively gentle force. NaOH is added, and after being allowed to stand for 3 minutes, it is rubbed to remove the stubborn stains on the flat silk. The flat silk is then picked up, soaked and washed with water for 5 times, spread on a drying table, and dried naturally. 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: Soak the dried silk in antibacterial and insect repellent for 15 minutes, pick it up and lay it flat to dry, repeat the soaking and drying twice, lay it flat and dry it;

[0057] S3: soaking the flat silk after drying in step S2 in a whitening and softening liquid, then picking it up, spreading it flat and drying it; then spraying antibacterial nanocapsules on one side and drying it to obtain the silk paper.

[0058] Example 2

[0059] 1. Preparation of insect repellent and antibacterial solution

[0060] 30 parts of neem bark powder, 15 parts of wormwood wool, 20 parts of mint powder, 30 parts of dispersed rosin glue, 900 parts of 95% ethanol, and 400 parts of purified water were mixed, and rapidly stirred for 10 hours at 50°C to fully dissolve natural antibacterial and insect repellent compounds such as azadirachtin, wormwood flavonoids, and mint essential oil in the ethanol aqueous solution. Subsequently, the mixture was filtered using 60-mesh, 100-mesh, and 200-mesh filters in sequence, and 70 parts of activated carbon powder were added to the filtrate, and after being uniformly stirred, the mixture was filtered using 60-mesh, 100-mesh, and 200-mesh filters in sequence, and the obtained filtrate was the antibacterial and insect repellent liquid.

[0061] 2. Prepare whitening and softening liquid

[0062] Prepare a glycerol aqueous solution with a volume fraction of 20%, and add TiO2 nanopowder with an average particle size of 80nm to make the concentration of the TiO2 nanopowder 25g / L, stir evenly, and then obtain a whitening and softening liquid.

[0063] 3. Prepare the silk paper of this embodiment as follows:

[0064] S1: By controlling the number of silkworms and the spinning time, flat silk with appropriate thickness is obtained. The flat silk is placed in warm water at 50°C, and sodium dodecyl sulfate (SDS), urea, and Ca(ClO)2 are added. After being kept warm and allowed to stand for 4 hours, it is stirred for 10 minutes. The slightly yellowish background on the flat silk is removed, and the key stained parts are rubbed with relatively gentle force. NaOH is added, and after being allowed to stand for 3 minutes, it is rubbed to remove the stubborn stains on the flat silk. The flat silk is then picked up, soaked and washed with water for 5 times, spread on a drying table, and dried naturally. 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: Soak the dried silk in antibacterial and insect repellent for 15 minutes, pick it up and lay it flat to dry, repeat the soaking and drying twice, lay it flat and dry it;

[0066] S3: soaking the flat silk after drying in step S2 in a whitening and softening liquid, then picking it up, spreading it flat and drying it; then spraying the antibacterial nanocapsules of Example 1 on one side and drying it to obtain the silk paper.

[0067] Example 3

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

[0069] 80 parts of neem bark powder, 10 parts of wormwood wool, 15 parts of mint powder, 20 parts of dispersed rosin glue, 800 parts of 95% ethanol, and 400 parts of purified water are mixed, and rapidly stirred for 10 hours at 45°C to fully dissolve natural antibacterial and insect repellent compounds such as azadirachtin, wormwood flavonoids, and mint essential oil in the ethanol aqueous solution. Then, filter the mixture using 60-mesh, 100-mesh, and 200-mesh filters in turn, add 80 parts of activated carbon powder to the filtrate, stir evenly, and filter the mixture using 60-mesh, 100-mesh, and 200-mesh filters in turn, and the resulting filtrate is the antibacterial and insect repellent liquid.

[0070] 2. Prepare whitening and softening liquid

[0071] Prepare a glycerol aqueous solution with a volume fraction of 20%, and add TiO2 nanopowder with an average particle size of 80nm to make the concentration of the TiO2 nanopowder 25g / L, stir evenly, and then obtain a whitening and softening liquid.

[0072] 3. Prepare the silk paper of this embodiment as follows:

[0073] S1: By controlling the number of silkworms and the spinning time, flat silk with appropriate thickness is obtained. The flat silk is placed in warm water at 50°C, and sodium dodecyl sulfate (SDS), urea, and Ca(ClO)2 are added. After being kept warm and allowed to stand for 4 hours, it is stirred for 10 minutes. The slightly yellowish background on the flat silk is removed, and the key stained parts are rubbed with relatively gentle force. NaOH is added, and after being allowed to stand for 3 minutes, it is rubbed to remove the stubborn stains on the flat silk. The flat silk is then picked up, soaked and washed with water for 5 times, spread on a drying table, and dried naturally. 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: Soak the dried silk in antibacterial and insect repellent for 15 minutes, pick it up and lay it flat to dry, repeat the soaking and drying twice, lay it flat and dry it;

[0075] S3: soaking the flat silk after drying in step S2 in a whitening and softening liquid, then picking it up, spreading it flat and drying it; then spraying the antibacterial nanocapsules of Example 1 on one side and drying it to obtain the silk paper.

[0076] Example 4

[0077] The difference from Example 1 is that in this embodiment, 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 that of 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 that of Example 1.

[0080] Comparative Example 1

[0081] The difference from Example 1 is that no antibacterial and insect repellent liquid is used for soaking treatment, and the remaining steps are the same as those in Example 1.

[0082] Comparative Example 2

[0083] The difference from Example 1 is that no whitening and softening liquid is used for soaking treatment, and the remaining steps are the same as those in Example 1.

[0084] Comparative Example 3

[0085] The difference from Example 1 is that no antibacterial nanocapsule treatment is used, and the remaining steps are the same as those in Example 1.

[0086] Experimental example

[0087] The silk papers of Examples 1-5 and Comparative Examples 1-3 were used as test objects to detect the sericin content and antibacterial properties of the silk papers. The results are shown in Table 1.

[0088] Table 1

[0089]

[0090]

[0091] In summary, the silk paper provided by the embodiments of the present invention has a high content of sericin, good antibacterial properties, and is not prone to fading or discoloration.

[0092] From the attached Figure 2-4 It can be seen that the silk paper obtained after being processed in step 2 and step 3 has a smooth, glossy and hair-free surface, which meets the writing requirements.

[0093] The embodiments described above are part of the embodiments of the present invention, rather than all of the embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A method for preparing antibacterial and insect-proof silk paper for painting and calligraphy, characterized in that: The following steps are involved: S1: Place the flat silk in warm water, add sodium dodecyl sulfate, urea, and Ca(ClO)2, keep warm and let stand, and stir; then add NaOH, let stand and rub, then pick up the flat silk, soak and wash with water, lay flat, and dry; S2: soak the dried silk in an antibacterial and insect repellent solution, pick it up and dry it, repeat the soaking and drying process 2-3 times, and then lay it flat and dry it; S3: soaking the flat silk after drying in step S2 in a whitening and softening liquid, then picking it up, spreading it flat and drying it; then spraying antibacterial nanocapsules on one or both sides of it, and drying it to obtain the silk paper.

2. The method for preparing antibacterial and insect-proof silk paper for painting and calligraphy according to claim 1, characterized in that: The insect-proof and antibacterial liquid comprises the following raw materials in parts by weight: 30-80 parts of chinaberry bark powder, 10-15 parts of wormwood wool, 10-20 parts of mint powder, 20-40 parts of dispersed rosin glue, 700-900 parts of 95% ethanol by volume, 300-400 parts of purified water and 20-80 parts of activated carbon.

3. The method for preparing antibacterial and insect-proof silk paper for painting and calligraphy according to claim 2, characterized in that: The insect-proof and antibacterial liquid is prepared by the following method: At 45-55°C, the remaining raw materials except activated carbon are mixed evenly, stirred for 6-18 hours, filtered with 60-mesh, 100-mesh and 200-mesh filters in sequence, activated carbon is added to the filtrate, stirred evenly, filtered with 60-mesh, 100-mesh and 200-mesh filters in sequence, and the filtrate is collected to obtain the insect-proof and antibacterial liquid.

4. The method for preparing antibacterial and insect-proof silk paper for painting and calligraphy according to claim 1, characterized in that: The whitening and softening liquid comprises a glycerol aqueous solution with a volume fraction of 5-20% and 5-25g / L of TiO2 nano powder.

5. The method for preparing antibacterial and insect-proof silk paper for painting and calligraphy according to claim 4, characterized in that: The particle size of the TiO2 nanopowder is less than 100 nm.

6. The method for preparing antibacterial and insect-proof silk paper for painting and calligraphy according to claim 1, characterized in that: In step S1, the concentration of urea is 1-8 mol / L, the concentration of Ca(ClO)2 is 1-5% w / v, and the mass fraction of NaOH is 2-5%.

7. The method for preparing antibacterial and insect-proof silk paper for painting and calligraphy according to claim 1, characterized in that: In the step S1, the temperature of the warm water is 45-55° C., and the insulation time is 3-5 hours.

8. The method for preparing antibacterial and insect-proof silk paper for painting and calligraphy according to claim 1, characterized in that: In the step S2, the soaking time in the antibacterial and insect-proof liquid is 10-20 minutes, and the temperature of the antibacterial and insect-proof liquid is 20-30°C.

9. The method for preparing antibacterial and insect-proof silk paper for painting and calligraphy according to claim 1, characterized in that: The preparation of the antibacterial nanocapsule comprises the following steps: CO-40, Span-80 and 1,2-propylene glycol were uniformly mixed to obtain emulsifier A; The two were uniformly mixed in a mass ratio of emulsifier A to plant essential oil = 7:3, and stirred at 30° C. for 20 min to obtain a mixed solution; Then, a chitosan aqueous solution with a mass fraction of 1% was added dropwise into the mixed solution until the solution became clear and transparent, and stirred for 30 minutes to obtain liquid antibacterial nanocapsules; Among them, the total mass of CO-40 and Span-80: the mass of 1,2-propylene glycol = 3:

1. 10.An antibacterial and insect-proof silk paper for calligraphy and painting, characterized in that: Prepared by the method described in any one of claims 1 to 9.

Images