High ink-absorbing synthetic paper and method for manufacturing the same

Abstract

The application provides a high-ink-absorption synthetic paper, which is a three-layer composite structure and comprises a PVC / cellulose / SiO2 composite layer, a porous cellulose electrostatic spinning layer and a PVC layer; the PVC / cellulose / SiO2 composite layer is composed of cellulose / SiO2 micro-nano spheres and PVC, and the mass ratio of the cellulose / SiO2 micro-nano spheres to the PVC is 1-2:10. In the application, a wet phase inversion and inorganic / organic filling modification technology are adopted to prepare the composite synthetic paper; the cellulose / SiO2 micro-nano spheres are added to the PVC, and the cellulose electrostatic spinning layer is added, so that the ink absorption effect of the synthetic paper can be improved.

Description

Technical Field

[0001] This invention relates to the field of papermaking, specifically to a high-absorbency synthetic paper and its preparation method. Background Technology

[0002] Synthetic paper, also known as plastic paper, chemical film paper, or stone paper, is a multifunctional material made primarily from calcium carbonate and polymer materials, with the addition of various additives. It is produced using polymer interfacial chemistry principles and filler modification technology through a special processing technique, exhibiting characteristics of both plastics and paper. Synthetic paper fundamentally changes the traditional papermaking process, effectively solving the environmental damage and water pollution problems associated with traditional papermaking. The emergence of synthetic paper has fundamental reasons; it is an inevitable result of social development. First, rapid economic development has drastically increased the demand for paper, leading to soaring pulp prices, reducing people's purchasing power, and prompting them to seek alternatives to traditional fiber paper. Second, the inherent characteristics of ordinary paper cannot meet specific requirements, such as water resistance, oil resistance, and acid and alkali resistance, while synthetic paper can compensate for these deficiencies to some extent. Finally, the decreasing availability of plant fibers such as wood used in papermaking and the significant environmental damage caused by the papermaking process mean that the emergence of synthetic paper, especially high-filler synthetic paper—stone paper—can mitigate the paper industry's consumption of vegetation and environmental damage. Therefore, the emergence of synthetic paper aligns with the current requirements of economic development, environmental protection, and low carbon emissions.

[0003] Although there is great potential for the development of synthetic paper in China, the production process mostly involves biaxial stretching. This process is not only complex in terms of formulation and technology, but also requires very expensive equipment, which increases the cost of producing synthetic paper and consequently the selling price, thus severely restricting the widespread application of the product. Summary of the Invention

[0004] The technical problem to be solved: The purpose of this invention is to provide a high ink absorption synthetic paper, which has a three-layer composite structure. Through the cooperation between the layers, it can achieve a very good ink absorption effect.

[0005] Technical solution: A high ink-absorbing synthetic paper, wherein the synthetic paper has a three-layer composite structure, including a PVC / cellulose / SiO2 composite layer, a porous cellulose electrospun layer and a PVC layer, wherein the PVC / cellulose / calcium carbonate composite layer is composed of cellulose / SiO2 micro-nanospheres and PVC, wherein the mass ratio of cellulose / SiO2 micro-nanospheres to PVC is 1-2:10.

[0006] Preferably, the method for preparing the cellulose electrospun layer includes the following steps:

[0007] S11. Dissolve cellulose in a DMAc / LiCl mixed solvent, maintain the reaction temperature of the solution at 60-80℃, and stir to dissolve to obtain a cellulose solution with a concentration of 1.5-3wt%;

[0008] S12. Add nano-calcium carbonate to DMAc, mix and stir evenly, then add to the cellulose solution prepared in step S1 to obtain a cellulose / calcium carbonate composite solution.

[0009] S13. Electrospinning the cellulose / calcium carbonate composite solution to obtain a cellulose electrospun membrane;

[0010] S14. Add the fiber bundle electrospun membrane to a dilute acid solution, soak to remove calcium carbonate, wash and dry to obtain a porous electrospun membrane.

[0011] Preferably, the content of nano-calcium carbonate in the cellulose solution in step S12 is 2-4 wt%.

[0012] Preferably, in step S13, the electrospinning distance is 12-18 cm, the flow rate is 0.05-0.1 mL / min, and the voltage is 15-18 kV. Preferably, the preparation method of the cellulose / SiO2 micro / nanospheres includes the following steps:

[0013] S21. Dissolve cellulose in an alkaline urea solution to prepare a cellulose solution with a concentration of 2.2-3 wt%;

[0014] S22. Add nanoporous SiO2 particles to the cellulose solution prepared in step S21, stir and mix evenly to obtain a cellulose / SiO2 mixed solution;

[0015] S23. The mixed solution prepared in step S23 is used to prepare cellulose / SiO2 micro / nanospheres by high-voltage electrostatic spraying.

[0016] Preferably, the content of nano-SiO2 particles in the mixed solution in step S22 is 5-30 wt%.

[0017] Preferably, in step S23, the needle used in the high-voltage electrostatic spray has an inner diameter of 1.2-1.5 mm, a spray distance of 12-18 cm, a flow rate of 0.01-0.03 mL / min, and a voltage of 12-15 kV.

[0018] The preparation method of the above-mentioned high-absorbency synthetic paper includes the following steps:

[0019] S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp liquid;

[0020] S2. Take a portion of the PVC pulp prepared in step S1, add cellulose / SiO2 micro-nanospheres to the PVC pulp, stir evenly, and obtain PVC synthetic pulp;

[0021] S3. Pour the remaining PVC pulp prepared in step S1 into a mold and evaporate the solvent to obtain a PVC layer;

[0022] S4. Place a porous cellulose electrospun layer on the surface of the PVC layer, then pour in PVC synthetic paper pulp, evaporate the solvent, and obtain highly absorbent synthetic paper.

[0023] Beneficial effects: The high ink absorption of this invention has the following advantages:

[0024] This invention employs wet phase inversion and inorganic / organic filler modification techniques to prepare composite synthetic paper. Adding cellulose / SiO2 micro-nano to PVC can improve the ink adsorption effect of the synthetic paper. Simultaneously, a cellulose electrospun layer is added between the two PVC layers. The cellulose / SiO2 micro-nano has a loose and porous structure, and the pores it forms in PVC are equivalent to capillaries. The electrospun layer also has a loose and porous structure. Under the action of capillaries and electrospun layers, ink can be absorbed quickly. In this invention, the amount of cellulose / SiO2 micro-nano added is much lower than the current requirement of 40-60% filler content, yet a very good ink absorption effect can still be achieved. Detailed Implementation

[0025] The present invention will be further described below with reference to embodiments. These embodiments are illustrative of the present invention, but the present invention is not limited to these embodiments:

[0026] Example 1

[0027] The preparation method of high-absorbency synthetic paper includes the following steps:

[0028] S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp liquid;

[0029] S2. Take a portion of the PVC pulp liquid prepared in step S1, add cellulose / SiO2 micro-nanospheres to the PVC pulp liquid, stir evenly, the mass ratio of cellulose / SiO2 micro-nanospheres to PVC is 1:10, and obtain PVC synthetic pulp liquid;

[0030] S3. Pour the PVC pulp prepared in step S1 into a mold and evaporate the solvent to obtain a PVC layer;

[0031] S4. Place a porous cellulose electrospun layer on the surface of the PVC layer, then pour in PVC synthetic paper pulp, evaporate the solvent, and obtain highly absorbent synthetic paper;

[0032] The method for preparing the cellulose electrospun layer includes the following steps:

[0033] S11. Dissolve cellulose in a DMAc / LiCl mixed solvent, maintain the reaction temperature of the solution at 60℃, and stir to dissolve to obtain a cellulose solution with a concentration of 1.5wt%;

[0034] S12. Add nano-calcium carbonate to DMAc, mix and stir evenly, and then add it to the cellulose solution prepared in step S1. The content of nano-calcium carbonate in the cellulose solution is 4wt%, and a cellulose / calcium carbonate composite solution is obtained.

[0035] S13. Electrospin the cellulose / calcium carbonate composite solution at a distance of 12 cm, a flow rate of 0.1 mL / min, and a voltage of 15 kV to obtain a cellulose electrospun membrane.

[0036] S14. Add the fiber bundle electrospun membrane to a dilute acid solution, soak to remove calcium carbonate, wash and dry to obtain a porous electrospun membrane;

[0037] The preparation method of the cellulose / SiO2 micro / nanospheres includes the following steps:

[0038] S21. Dissolve cellulose in an alkaline urea solution to prepare a cellulose solution with a concentration of 2.2 wt%;

[0039] S22. Add nanoporous SiO2 particles to the cellulose solution prepared in step S21, stir and mix evenly to obtain a cellulose / SiO2 mixed solution, wherein the content of nanoSiO2 particles in the mixed solution is 5 wt%.

[0040] S23. The mixed solution prepared in step S23 is used to prepare cellulose / SiO2 micro / nanospheres by high-voltage electrostatic spraying. The needle used in the high-voltage electrostatic spraying has an inner diameter of 1.2 mm, a spraying distance of 12 cm, a flow rate of 0.01 mL / min, and a voltage of 12 kV.

[0041] Example 2

[0042] The preparation method of high-absorbency synthetic paper includes the following steps:

[0043] S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp liquid;

[0044] S2. Take a portion of the PVC pulp prepared in step S1, add cellulose / SiO2 micro-nanospheres to the PVC pulp, stir evenly, the mass ratio of cellulose / SiO2 micro-nanospheres to PVC is 1:5, and obtain PVC synthetic pulp;

[0045] S3. Pour the PVC pulp prepared in step S1 into a mold and evaporate the solvent to obtain a PVC layer;

[0046] S4. Place a porous cellulose electrospun layer on the surface of the PVC layer, then pour in PVC synthetic paper pulp, evaporate the solvent, and obtain highly absorbent synthetic paper;

[0047] The method for preparing the cellulose electrospun layer includes the following steps:

[0048] S11. Dissolve cellulose in a DMAc / LiCl mixed solvent, maintain the reaction temperature of the solution at 80℃, and stir to dissolve to obtain a cellulose solution with a concentration of 3wt%;

[0049] S12. Add nano-calcium carbonate to DMAc, mix and stir evenly, and then add it to the cellulose solution prepared in step S1. The content of nano-calcium carbonate in the cellulose solution is 2wt%, and a cellulose / calcium carbonate composite solution is obtained.

[0050] S13. Electrospinning of cellulose / calcium carbonate composite solution was carried out at a distance of 18 cm, a flow rate of 0.05 mL / min, and a voltage of 18 kV to obtain cellulose electrospun membrane.

[0051] S14. Add the fiber bundle electrospun membrane to a dilute acid solution, soak to remove calcium carbonate, wash and dry to obtain a porous electrospun membrane;

[0052] The preparation method of the cellulose / SiO2 micro / nanospheres includes the following steps:

[0053] S21. Dissolve cellulose in an alkaline urea solution to prepare a cellulose solution with a concentration of 3 wt%;

[0054] S22. Add nanoporous SiO2 particles to the cellulose solution prepared in step S21, stir and mix evenly to obtain a cellulose / SiO2 mixed solution, wherein the content of nanoSiO2 particles in the mixed solution is 30wt%.

[0055] S23. The mixed solution prepared in step S23 is used to prepare cellulose / SiO2 micro / nanospheres by high-voltage electrostatic spraying. The needle used in the high-voltage electrostatic spraying has an inner diameter of 1.5 mm, a spraying distance of 18 cm, a flow rate of 0.03 mL / min, and a voltage of 15 kV.

[0056] Example 3

[0057] The preparation method of high-absorbency synthetic paper includes the following steps:

[0058] S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp liquid;

[0059] S2. Take a portion of the PVC pulp liquid prepared in step S1, add cellulose / SiO2 micro-nanospheres to the PVC pulp liquid, stir evenly, the mass ratio of cellulose / SiO2 micro-nanospheres to PVC is 1.2:10, and obtain PVC synthetic pulp liquid;

[0060] S3. Pour the PVC pulp prepared in step S1 into a mold and evaporate the solvent to obtain a PVC layer;

[0061] S4. Place a porous cellulose electrospun layer on the surface of the PVC layer, then pour in PVC synthetic paper pulp, evaporate the solvent, and obtain highly absorbent synthetic paper;

[0062] The method for preparing the cellulose electrospun layer includes the following steps:

[0063] S11. Dissolve cellulose in a DMAc / LiCl mixed solvent, maintain the reaction temperature of the solution at 65℃, and stir to dissolve to obtain a cellulose solution with a concentration of 1.8wt%;

[0064] S12. Add nano-calcium carbonate to DMAc, mix and stir evenly, and then add it to the cellulose solution prepared in step S1. The content of nano-calcium carbonate in the cellulose solution is 2.5 wt%, and a cellulose / calcium carbonate composite solution is obtained.

[0065] S13. Electrospin the cellulose / calcium carbonate composite solution at a distance of 14 cm, a flow rate of 0.05 mL / min, and a voltage of 15 kV to obtain a cellulose electrospun membrane.

[0066] S14. Add the fiber bundle electrospun membrane to a dilute acid solution, soak to remove calcium carbonate, wash and dry to obtain a porous electrospun membrane;

[0067] The preparation method of the cellulose / SiO2 micro / nanospheres includes the following steps:

[0068] S21. Dissolve cellulose in an alkaline urea solution to prepare a cellulose solution with a concentration of 2.4 wt%;

[0069] S22. Add nanoporous SiO2 particles to the cellulose solution prepared in step S21, stir and mix evenly to obtain a cellulose / SiO2 mixed solution, wherein the content of nanoSiO2 particles in the mixed solution is 15wt%.

[0070] S23. The mixed solution prepared in step S23 is used to prepare cellulose / SiO2 micro / nanospheres by high-voltage electrostatic spraying. The needle used in the high-voltage electrostatic spraying has an inner diameter of 1.2 mm, a spraying distance of 16 cm, a flow rate of 0.01 mL / min, and a voltage of 12 kV.

[0071] Example 4

[0072] The preparation method of high-absorbency synthetic paper includes the following steps:

[0073] S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp liquid;

[0074] S2. Take a portion of the PVC pulp prepared in step S1, add cellulose / SiO2 micro-nanospheres to the PVC pulp, stir evenly, the mass ratio of cellulose / SiO2 micro-nanospheres to PVC is 1.6:10, and obtain PVC synthetic pulp;

[0075] S3. Pour the PVC pulp prepared in step S1 into a mold and evaporate the solvent to obtain a PVC layer;

[0076] S4. Place a porous cellulose electrospun layer on the surface of the PVC layer, then pour in PVC synthetic paper pulp, evaporate the solvent, and obtain highly absorbent synthetic paper;

[0077] The method for preparing the cellulose electrospun layer includes the following steps:

[0078] S11. Dissolve cellulose in a DMAc / LiCl mixed solvent, maintain the reaction temperature of the solution at 75℃, and stir to dissolve to obtain a cellulose solution with a concentration of 2.5wt%;

[0079] S12. Add nano-calcium carbonate to DMAc, mix and stir evenly, and then add it to the cellulose solution prepared in step S1. The content of nano-calcium carbonate in the cellulose solution is 3.5 wt%, and a cellulose / calcium carbonate composite solution is obtained.

[0080] S13. Electrospinning of cellulose / calcium carbonate composite solution was carried out at a distance of 16 cm, a flow rate of 0.1 mL / min, and a voltage of 18 kV to obtain cellulose electrospun membrane;

[0081] S14. Add the fiber bundle electrospun membrane to a dilute acid solution, soak to remove calcium carbonate, wash and dry to obtain a porous electrospun membrane;

[0082] The preparation method of the cellulose / SiO2 micro / nanospheres includes the following steps:

[0083] S21. Dissolve cellulose in an alkaline urea solution to prepare a cellulose solution with a concentration of 2.8 wt%;

[0084] S22. Add nanoporous SiO2 particles to the cellulose solution prepared in step S21, stir and mix evenly to obtain a cellulose / SiO2 mixed solution, wherein the content of nanoSiO2 particles in the mixed solution is 25wt%.

[0085] S23. The mixed solution prepared in step S23 is used to prepare cellulose / SiO2 micro / nanospheres by high-voltage electrostatic spraying. The needle used in the high-voltage electrostatic spraying has an inner diameter of 1.5 mm, a spraying distance of 16 cm, a flow rate of 0.03 mL / min, and a voltage of 15 kV.

[0086] Example 5

[0087] The preparation method of high-absorbency synthetic paper includes the following steps:

[0088] S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp liquid;

[0089] S2. Take a portion of the PVC pulp liquid prepared in step S1, add cellulose / SiO2 micro-nanospheres to the PVC pulp liquid, stir evenly, the mass ratio of cellulose / SiO2 micro-nanospheres to PVC is 1.5:10, and obtain PVC synthetic pulp liquid;

[0090] S3. Pour the PVC pulp prepared in step S1 into a mold and evaporate the solvent to obtain a PVC layer;

[0091] S4. Place a porous cellulose electrospun layer on the surface of the PVC layer, then pour in PVC synthetic paper pulp, evaporate the solvent, and obtain highly absorbent synthetic paper;

[0092] The method for preparing the cellulose electrospun layer includes the following steps:

[0093] S11. Dissolve cellulose in a DMAc / LiCl mixed solvent, maintain the reaction temperature of the solution at 70℃, and stir to dissolve to obtain a cellulose solution with a concentration of 2.2wt%;

[0094] S12. Add nano-calcium carbonate to DMAc, mix and stir evenly, and then add it to the cellulose solution prepared in step S1. The content of nano-calcium carbonate in the cellulose solution is 3wt%, and a cellulose / calcium carbonate composite solution is obtained.

[0095] S13. Electrospin the cellulose / calcium carbonate composite solution at a distance of 15 cm, a flow rate of 0.08 mL / min, and a voltage of 16 kV to obtain a cellulose electrospun membrane.

[0096] S14. Add the fiber bundle electrospun membrane to a dilute acid solution, soak to remove calcium carbonate, wash and dry to obtain a porous electrospun membrane;

[0097] The preparation method of the cellulose / SiO2 micro / nanospheres includes the following steps:

[0098] S21. Dissolve cellulose in an alkaline urea solution to prepare a cellulose solution with a concentration of 2.6 wt%;

[0099] S22. Add nanoporous SiO2 particles to the cellulose solution prepared in step S21, stir and mix evenly to obtain a cellulose / SiO2 mixed solution, wherein the content of nanoSiO2 particles in the mixed solution is 20wt%.

[0100] S23. The mixed solution prepared in step S23 is used to prepare cellulose / SiO2 micro / nanospheres by high-voltage electrostatic spraying. The needle used in the high-voltage electrostatic spraying has an inner diameter of 1.5 mm, a spraying distance of 16 cm, a flow rate of 0.02 mL / min, and a voltage of 14 kV.

[0101] Comparative Example 1

[0102] The preparation method of high-absorbency synthetic paper includes the following steps:

[0103] S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp liquid;

[0104] S2. Take a portion of the PVC pulp liquid prepared in step S1, add cellulose / SiO2 micro-nanospheres to the PVC pulp liquid, stir evenly, the mass ratio of cellulose / SiO2 micro-nanospheres to PVC is 1.5:10, and obtain PVC synthetic pulp liquid;

[0105] S3. Pour the PVC pulp prepared in step S1 into a mold and evaporate the solvent to obtain a PVC layer;

[0106] S4. Pour PVC synthetic paper pulp onto the surface of the PVC layer, evaporate the solvent, and obtain highly absorbent synthetic paper;

[0107] The preparation method of the cellulose / SiO2 micro / nanospheres includes the following steps:

[0108] S21. Dissolve cellulose in an alkaline urea solution to prepare a cellulose solution with a concentration of 2.6 wt%;

[0109] S22. Add nanoporous SiO2 particles to the cellulose solution prepared in step S21, stir and mix evenly to obtain a cellulose / SiO2 mixed solution, wherein the content of nanoSiO2 particles in the mixed solution is 20wt%.

[0110] S23. The mixed solution prepared in step S23 is used to prepare cellulose / SiO2 micro / nanospheres by high-voltage electrostatic spraying. The needle used in the high-voltage electrostatic spraying has an inner diameter of 1.5 mm, a spraying distance of 16 cm, a flow rate of 0.02 mL / min, and a voltage of 14 kV.

[0111] Comparative Example 2

[0112] The preparation method of high-absorbency synthetic paper includes the following steps:

[0113] S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp liquid;

[0114] S2. Place the porous cellulose electrospun layer in a mold, pour the PVC pulp prepared in step S1 into the mold, evaporate the solvent to obtain a highly absorbent synthetic paper.

[0115] The method for preparing the cellulose electrospun layer includes the following steps:

[0116] S11. Dissolve cellulose in a DMAc / LiCl mixed solvent, maintain the reaction temperature of the solution at 70℃, and stir to dissolve to obtain a cellulose solution with a concentration of 2.2wt%;

[0117] S12. Add nano-calcium carbonate to DMAc, mix and stir evenly, and then add it to the cellulose solution prepared in step S1. The content of nano-calcium carbonate in the cellulose solution is 3wt%, and a cellulose / calcium carbonate composite solution is obtained.

[0118] S13. Electrospin the cellulose / calcium carbonate composite solution at a distance of 15 cm, a flow rate of 0.08 mL / min, and a voltage of 16 kV to obtain a cellulose electrospun membrane.

[0119] S14. Add the fiber bundle electrospun membrane to a dilute acid solution, soak to remove calcium carbonate, wash and dry to obtain a porous electrospun membrane;

[0120] Comparative Example 3

[0121] The preparation method of high-absorbency synthetic paper includes the following steps:

[0122] S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp liquid;

[0123] S2. Take a portion of the PVC pulp prepared in step S1, add calcium carbonate to the PVC pulp, stir evenly, the mass ratio of calcium carbonate to PVC is 4:10, and obtain PVC synthetic pulp.

[0124] S3. Pour the PVC pulp prepared in step S1 into a mold and evaporate the solvent to obtain a PVC layer;

[0125] S4. Place a porous cellulose electrospun layer on the surface of the PVC layer, then pour in PVC synthetic paper pulp, evaporate the solvent, and obtain highly absorbent synthetic paper;

[0126] The method for preparing the cellulose electrospun layer includes the following steps:

[0127] S11. Dissolve cellulose in a DMAc / LiCl mixed solvent, maintain the reaction temperature of the solution at 70℃, and stir to dissolve to obtain a cellulose solution with a concentration of 2.2wt%;

[0128] S12. Add nano-calcium carbonate to DMAc, mix and stir evenly, and then add it to the cellulose solution prepared in step S1. The content of nano-calcium carbonate in the cellulose solution is 3wt%, and a cellulose / calcium carbonate composite solution is obtained.

[0129] S13. Electrospin the cellulose / calcium carbonate composite solution at a distance of 15 cm, a flow rate of 0.08 mL / min, and a voltage of 16 kV to obtain a cellulose electrospun membrane.

[0130] S14. Add the fiber bundle electrospun membrane to a dilute acid solution, soak to remove calcium carbonate, wash and dry to obtain a porous electrospun membrane.

[0131] Comparative Example 4

[0132] The preparation method of high-absorbency synthetic paper includes the following steps:

[0133] S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp liquid;

[0134] S2. Take a portion of the PVC pulp prepared in step S1, add SiO2 micro-nanospheres to the PVC pulp, stir evenly, the mass ratio of SiO2 micro-nanospheres to PVC is 2.5:10, and obtain PVC synthetic pulp;

[0135] S3. Pour the PVC pulp prepared in step S1 into a mold and evaporate the solvent to obtain a PVC layer;

[0136] S4. Place a porous cellulose electrospun layer on the surface of the PVC layer, then pour in PVC synthetic paper pulp, evaporate the solvent, and obtain highly absorbent synthetic paper;

[0137] The method for preparing the cellulose electrospun layer includes the following steps:

[0138] S11. Dissolve cellulose in a DMAc / LiCl mixed solvent, maintain the reaction temperature of the solution at 70℃, and stir to dissolve to obtain a cellulose solution with a concentration of 2.2wt%;

[0139] S12. Add nano-calcium carbonate to DMAc, mix and stir evenly, and then add it to the cellulose solution prepared in step S1. The content of nano-calcium carbonate in the cellulose solution is 3wt%, and a cellulose / calcium carbonate composite solution is obtained.

[0140] S13. Electrospin the cellulose / calcium carbonate composite solution at a distance of 15 cm, a flow rate of 0.08 mL / min, and a voltage of 16 kV to obtain a cellulose electrospun membrane.

[0141] S14. Add the fiber bundle electrospun membrane to a dilute acid solution, soak to remove calcium carbonate, wash and dry to obtain a porous electrospun membrane.

[0142] Comparative Example 5

[0143] The preparation method of high-absorbency synthetic paper includes the following steps:

[0144] S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp liquid;

[0145] S2. Take a portion of the PVC pulp liquid prepared in step S1, add cellulose / SiO2 micro-nanospheres to the PVC pulp liquid, stir evenly, the mass ratio of cellulose / SiO2 micro-nanospheres to PVC is 1.5:10, and obtain PVC synthetic pulp liquid;

[0146] S3. Pour the PVC pulp prepared in step S1 into a mold and evaporate the solvent to obtain a PVC layer;

[0147] S4. Place a multi-cellulose electrospun film on the surface of the PVC layer, then pour in PVC synthetic paper pulp, evaporate the solvent, and obtain highly absorbent synthetic paper;

[0148] The method for preparing the cellulose electrospun layer includes the following steps:

[0149] S11. Dissolve cellulose in a DMAc / LiCl mixed solvent, maintain the reaction temperature of the solution at 70℃, and stir to dissolve to obtain a cellulose solution with a concentration of 2.2wt%;

[0150] S12. Electrospin the cellulose solution at a distance of 15 cm, a flow rate of 0.08 mL / min, and a voltage of 16 kV to obtain a cellulose electrospun membrane.

[0151] The preparation method of the cellulose / SiO2 micro / nanospheres includes the following steps:

[0152] S21. Dissolve cellulose in an alkaline urea solution to prepare a cellulose solution with a concentration of 2.6 wt%;

[0153] S22. Add nanoporous SiO2 particles to the cellulose solution prepared in step S21, stir and mix evenly to obtain a cellulose / SiO2 mixed solution, wherein the content of nanoSiO2 particles in the mixed solution is 20wt%.

[0154] S23. The mixed solution prepared in step S23 is used to prepare cellulose / SiO2 micro / nanospheres by high-voltage electrostatic spraying. The needle used in the high-voltage electrostatic spraying has an inner diameter of 1.5 mm, a spraying distance of 16 cm, a flow rate of 0.02 mL / min, and a voltage of 14 kV.

[0155] Comparative Example 6

[0156] The preparation method of high-absorbency synthetic paper includes the following steps:

[0157] S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp liquid;

[0158] S2. Take a portion of the PVC pulp liquid prepared in step S1, add cellulose / SiO2 micro-nanospheres to the PVC pulp liquid, stir evenly, the mass ratio of cellulose / SiO2 micro-nanospheres to PVC is 3:10, and obtain PVC synthetic pulp liquid;

[0159] S3. Pour the PVC pulp prepared in step S1 into a mold and evaporate the solvent to obtain a PVC layer;

[0160] S4. Place a porous cellulose electrospun layer on the surface of the PVC layer, then pour in PVC synthetic paper pulp, evaporate the solvent, and obtain highly absorbent synthetic paper;

[0161] The method for preparing the cellulose electrospun layer includes the following steps:

[0162] S11. Dissolve cellulose in a DMAc / LiCl mixed solvent, maintain the reaction temperature of the solution at 70℃, and stir to dissolve to obtain a cellulose solution with a concentration of 2.2wt%;

[0163] S12. Add nano-calcium carbonate to DMAc, mix and stir evenly, and then add it to the cellulose solution prepared in step S1. The content of nano-calcium carbonate in the cellulose solution is 3wt%, and a cellulose / calcium carbonate composite solution is obtained.

[0164] S13. Electrospin the cellulose / calcium carbonate composite solution at a distance of 15 cm, a flow rate of 0.08 mL / min, and a voltage of 16 kV to obtain a cellulose electrospun membrane.

[0165] S14. Add the fiber bundle electrospun membrane to a dilute acid solution, soak to remove calcium carbonate, wash and dry to obtain a porous electrospun membrane;

[0166] The preparation method of the cellulose / SiO2 micro / nanospheres includes the following steps:

[0167] S21. Dissolve cellulose in an alkaline urea solution to prepare a cellulose solution with a concentration of 2.6 wt%;

[0168] S22. Add nanoporous SiO2 particles to the cellulose solution prepared in step S21, stir and mix evenly to obtain a cellulose / SiO2 mixed solution, wherein the content of nanoSiO2 particles in the mixed solution is 20wt%.

[0169] S23. The mixed solution prepared in step S23 is used to prepare cellulose / SiO2 micro / nanospheres by high-voltage electrostatic spraying. The needle used in the high-voltage electrostatic spraying has an inner diameter of 1.5 mm, a spraying distance of 16 cm, a flow rate of 0.02 mL / min, and a voltage of 14 kV.

[0170] Performance testing:

[0171] Water absorption and ink absorption rate tests: Cut synthetic paper into 30mm*30mm pieces, dry at 40℃ to constant weight, weigh, and record as m0. Then immerse in water or carbon ink for 24 hours. Afterward, use filter paper to absorb the water / ink from the sample surface, weigh, and record as m1. Calculate the water / ink absorption rate of the sample: Water / ink absorption rate = (m1-m0) / m0*100%;

[0172] Mechanical property testing: The synthetic paper was sampled using a mold (dumbbell type) and its thickness was measured. Then, the mechanical properties of the synthetic paper were measured in a universal testing machine at a speed of 50 mm / min.

[0173] Water absorption rate % Ink absorption rate % Tensile strength (MPa) Example 1 24.2 17.2 8.8 Example 2 28.6 20.6 8.6 Example 3 25.9 18.1 9.2 Example 4 26.8 18.5 8.5 Example 5 26.7 18.5 9.0 Comparative Example 1 15.6 11.2 6.7 Comparative Example 2 14.2 8.6 9.6 Comparative Example 3 18.9 15.2 8.6 Comparative Example 4 16.5 11.1 9.1 Comparative Example 5 21.6 16.0 9.5 Comparative Example 6 29.9 22.3 3.5

[0174] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A high-absorbency synthetic paper, characterized in that: The synthetic paper has a three-layer composite structure, including a PVC / cellulose / SiO2 composite layer, a porous cellulose electrospun layer and a PVC layer. The PVC / cellulose / SiO2 composite layer is composed of cellulose / SiO2 micro-nanospheres and PVC, wherein the mass ratio of cellulose / SiO2 micro-nanospheres to PVC is 1-2:

10. The method for preparing the porous cellulose electrospun layer includes the following steps: S11. Dissolve cellulose in a DMAc / LiCl mixed solvent, maintain the reaction temperature of the solution at 60-80℃, and stir to dissolve to obtain a cellulose solution with a concentration of 1.5-3wt%; S12. Add nano-calcium carbonate to DMAc, mix and stir evenly, then add to the cellulose solution prepared in step S1 to obtain a cellulose / calcium carbonate composite solution; S13. Electrospinning a cellulose / calcium carbonate composite solution to obtain a cellulose electrospun membrane; S14. Add the cellulose electrospun membrane to a dilute acid solution, soak to remove calcium carbonate, wash and dry to obtain a porous cellulose electrospun layer; The preparation method of the cellulose / SiO2 micro / nanospheres includes the following steps: S21. Dissolve cellulose in an alkaline urea solution to prepare a cellulose solution with a concentration of 2.2-3 wt%; S22. Add nanoporous SiO2 particles to the cellulose solution prepared in step S21, stir and mix evenly to obtain a cellulose / SiO2 mixed solution; S23. The mixed solution prepared in step S22 is used to prepare cellulose / SiO2 micro / nanospheres by high-voltage electrostatic spraying; The preparation method of the above-mentioned high-absorbency synthetic paper includes the following steps: S1. Dissolve PVC in DMF, mix and stir, and after dissolution, obtain PVC pulp solution; S2. Take a portion of the PVC pulp prepared in step S1, add cellulose / SiO2 micro-nanospheres to the PVC pulp, stir evenly, and obtain PVC synthetic pulp; S3. Pour the PVC pulp prepared in step S1 into a mold and evaporate the solvent to obtain a PVC layer; S4. Place a porous cellulose electrospun layer on the surface of the PVC layer, then pour in PVC synthetic paper pulp, evaporate the solvent, and obtain highly absorbent synthetic paper.

2. The high-absorbency synthetic paper according to claim 1, characterized in that: In step S12, the content of nano-calcium carbonate in the cellulose solution is 2-4 wt%.

3. The high-absorbency synthetic paper according to claim 1, characterized in that: In step S13, the electrospinning distance is 12-18 cm, the flow rate is 0.05-0.1 mL / min, and the voltage is 15-18 kV.

4. The high-absorbency synthetic paper according to claim 1, characterized in that: In step S22, the content of nano-SiO2 particles in the mixed solution is 5-30 wt%.

5. The high-absorbency synthetic paper according to claim 1, characterized in that: In step S23, the needle used in the high-voltage electrostatic spray has an inner diameter of 1.2-1.5 mm, a spray distance of 12-18 cm, a flow rate of 0.01-0.03 mL / min, and a voltage of 12-15 kV.