Process for preparing hydrophobic degradable cellulose-based non-woven fabric

Abstract

The invention provides a process for preparing a hydrophobic degradable cellulose-based non-woven fabric, and relates to the technical field of non-woven fabric production. The process system for preparing the hydrophobic degradable non-woven fabric comprises a material extrusion system, a solution spray spinning system, a process hot nitrogen system, a receiving web forming system, a fiber web consolidation system and a hydrophobic modification coating system, and the solution spray spinning system is arranged at the rear end of the material extrusion system; a process hot nitrogen system is arranged at the rear end of the solution spray spinning system, a receiving web forming system is arranged at the lower end of the solution spray spinning system, a fiber web consolidation system and a hydrophobic modification coating system are arranged at the lower end of the receiving web forming system, and the process hot nitrogen system is composed of a nitrogen heater, an airflow flowmeter and a compressed nitrogen tank. In the invention, the production process is simple and coherent, the non-woven fabric can be prepared in one step, the cost is low, and when the product prepared by the process is used, the product has hydrophobic performance, the degradation rate can reach 100%, and the environment cannot be polluted.

Description

Technical Field

[0001] The invention relates to the technical field of non-woven fabric production, in particular to a process for preparing hydrophobic and degradable cellulose-based non-woven fabric. Background Art

[0002] Nonwoven fabrics are a new type of fiber products and are also the youngest and most promising industry in the textile industry. They are mainly used in medical and health care, clothing, shoes and hats, decoration, industry, civil engineering, automobile industry, agriculture and gardening, military and national defense and other fields.

[0003] After searching, China Patents has authorized an invention patent: pure cotton non-woven fabric and its manufacturing method (authorization announcement number CN109371667B), including a rapid scouring agent, the rapid scouring agent includes reagent A and reagent B, wherein reagent A includes the following components: composite alkali agent, penetrant, sodium silicate, stabilizer, aminotrimethylenephosphonic acid and water; the reagent B includes the following components: condensation product of 16-18 fatty alcohol and ethylene oxide, polyacrylamide and water. The pure cotton non-woven fabric scouring agent provided by the invention is used for rapid bleaching and boiling of non-woven fabrics. The process is simple and fast. It can achieve rapid bleaching and boiling of pure cotton non-woven fabrics without step-by-step feeding of multiple raw materials. The raw materials used have low pollution to the environment, are low-alkali and environmentally friendly, and will not cause strength reduction accidents; it has the functions of saving water, time, energy, and reducing costs; it greatly reduces the boiling loss of pure cotton non-woven fabrics, and has important practical application value.

[0004] Although the above patent can produce biomass non-woven fabrics, the pure cotton material used has poor mechanical properties and lacks hydrophobic properties, and its use is relatively single.

[0005] After searching, China Patents authorized an invention patent: High-performance polypropylene melt-blown non-woven fabric and its preparation method (authorization announcement number CN115125672B), which provides a high-performance polypropylene melt-blown non-woven fabric and its preparation method, wherein the polypropylene melt-blown non-woven fabric is dipped and treated in a specific treatment liquid, and the dip-blown parameters and liquid carrying rate are controlled, and then hot-pressed. The oligomers in the treatment liquid penetrate between the polypropylene fibers, and after hot pressing, a porous membrane structure is formed between the fibers, and the fibers are interspersed between the porous membrane structures to form a cross-linked and bonded fiber structure, which enhances the force between the fibers and between the fiber layers; pressurization after dipping can enhance the contact effect and force between the fibers and the oligomers, thereby improving the mechanical properties of the polypropylene melt-blown non-woven fabric. Hot pressing treatment allows the non-woven fabric to maintain good air permeability and also improves its surface uniformity and flatness. This method is a post-treatment of the polypropylene melt-blown non-woven fabric, which improves its surface properties, mechanical properties and air permeability without interfering with its process parameters and processes; and the process is simple, the parameters are controllable, and industrial production can be realized.

[0006] Although the above patent can produce petroleum-based non-woven fabrics with good mechanical properties, they are not degradable. If they are not recycled properly, they will easily produce microplastics and cause environmental pollution. They also do not have hydrophobic properties and have relatively single uses.

[0007] In view of the above problems, the technicians in this field provide a process for preparing hydrophobic and degradable cellulose-based non-woven fabrics, which uses corn stalks, reed stalks, coconut palm, hemp pulp, bamboo pulp, etc. as raw materials, including a material extrusion system, a solution spray spinning system, a process hot nitrogen system, a receiving web forming system, a fiber web consolidation system and a hydrophobic modification coating system, and adopts a simple process to produce high-performance products. The prepared product is formed in one step, and the fiber comes from biomass and can be 100% degraded. The hydrophobic modification material used is a mixed solution of an appropriately proportioned organosilicon material and beeswax or alcohol substances, which will not cause pollution to the environment. The obtained finished product has a wide range of applications. With its hydrophobic properties and degradable and pollution-free characteristics, it can be used in the fields of land covering, prevention and control of soil erosion, etc. Summary of the invention

[0008] (I) Technical problems to be solved: In view of the deficiencies in the prior art, the present invention provides a process for preparing a hydrophobic and degradable cellulose-based non-woven fabric. The process is simple and has fewer steps. The non-woven fabric is hydrophobically modified by a hydrophobic material, and the hydrophobic modified material is evenly coated on a fiber web by a spraying process, and then consolidated to form a non-woven fabric product. A degradable non-woven fabric with strong hydrophobic properties and a wide range of uses is provided. The non-woven fabric is pollution-free to the environment and has a good hydrophobic effect, which effectively improves the above-mentioned technical status.

[0009] (II) Technical solution: To achieve the above objectives, the present invention is implemented through the following technical solution.

[0010] A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric, the process comprising a material extrusion system, a solution spray spinning system, a process hot nitrogen system, a receiving web forming system, a fiber web consolidation system and a hydrophobic modification coating system, wherein the material extrusion system is provided with a solution spray spinning system at the rear end, the solution spray spinning system is provided with a process hot nitrogen system at the rear end, the solution spray spinning system is provided with a receiving web forming system at the lower end, the receiving web forming system is provided with a fiber web consolidation system and a hydrophobic modification coating system at the lower end, and the process hot nitrogen system is composed of a nitrogen heater, an airflow flowmeter and a compressed nitrogen tank.

[0011] Preferably, the material extrusion system comprises a solution reactor, and the solution reactor can be used for solvent dissolving bio-based fiber pulp, and the dissolved solution is used as a raw material for preparing non-woven fabrics and has degradable properties.

[0012] Preferably, the hydrophobic modified coating system is to coat some hydrophobic modified materials on the consolidated fiber web to produce a non-woven fabric body, and the non-woven fabric body has hydrophobic properties after coating.

[0013] Preferably, the nonwoven fabric body is prepared by a one-step continuous process, firstly, the raw materials for preparing the nonwoven fabric are prepared, then the fibers are prepared by a spinning process, and finally the nonwoven fabric body is prepared by a fiber web consolidation process system.

[0014] Preferably, the above-mentioned spinning raw material is bio-based fiber pulp / NMMO aqueous solution, the polymerization degree of the spinning raw material is 300~500, the fluidity index of the spinning raw material is 10g / min~20g / min, the ash content of the spinning raw material is less than or equal to 200ppm, the water content of the spinning raw material is 10%~20%, and the temperature of the spinning raw material is 105~120℃.

[0015] Preferably, the distance between the solution jet spinning system and the receiving web forming system is 200-800 mm.

[0016] Preferably, a process for preparing a hydrophobic degradable cellulose-based nonwoven fabric comprises the following steps:

[0017] Step 1: Place the spinning raw materials into a solution reactor isolated from oxygen, mix them evenly, and then pass the evenly mixed spinning raw materials through the material extrusion system;

[0018] Step 2, extruding the spinning raw material from the material extrusion system, and outputting it into the solution spinning system through a metering device;

[0019] Step 3: The spinneret raw material is ejected from the solution spinning system under pressure, and the ejected spinneret raw material is formed into fibers by the process hot nitrogen system and laid on the receiving web forming system to form a fiber web. The mechanism is as follows: after the spinneret raw material is ejected from the solution spinning system, it is evenly blown to the receiving web forming system by the 80-90°C hot air provided by the process hot nitrogen system, and the receiving web forming system provides a coagulation bath with 90-100°C pure water as raw material, thereby reducing the mass fraction of NMMO in the spinneret raw material solution. In this process, the NMMO in the spinneret raw material solution and the cellulose molecules are bonded to each other. The hydrogen bonds of NMMO and cellulose molecules are gradually broken, NMMO gradually forms hydrogen bonds with water molecules, the dissolving ability of NMMO aqueous solution on cellulose is reduced, and cellulose is gradually precipitated, until the mass fraction of NMMO in the solution is reduced to below 78%, at which time the hydrogen bonds between NMMO and cellulose molecules in the solution are completely broken, NMMO completely forms hydrogen bonds with water molecules, the NMMO aqueous solution no longer has the ability to dissolve cellulose, and cellulose is completely precipitated. The diluted NMMO aqueous solution is drained and recovered, and the solid fiber part remaining on the receiving web forming system is evenly distributed on the receiving web forming system to form a fiber web;

[0020] Step 4: After the fiber web passes through the receiving web forming system, the hydrophobic modified material is coated onto the fiber web at a temperature of 50-80°C through a hydrophobic modified coating system containing the hydrophobic modified material, and then the fiber web is consolidated through a fiber web consolidation system to finally form a hydrophobic and degradable multi-performance non-woven fabric body.

[0021] Preferably, the screw diameter of the material extrusion system is 80-100 mm, the aspect ratio of the screw is 10-15, the feeding section temperature of the screw is 105-120° C., and the compression section temperature of the screw is 105-120° C.

[0022] Preferably, the temperature of the spinneret in the solution jet spinning system is 105-120° C., and the jet aperture of the spinneret is 200-500 nm.

[0023] Preferably, the angle between the spinning raw material and the airflow is 30 to 60 degrees.

[0024] Preferably, the distance between the solution jet spinning system and the receiving web forming system is 200-800 mm.

[0025] (III) Beneficial effects: The present invention provides a process for preparing a hydrophobic and degradable cellulose-based non-woven fabric. It has the following beneficial effects:

[0026] 1. The present invention provides a process for preparing a hydrophobic and degradable cellulose-based non-woven fabric. The production process is simple and coherent, and the non-woven fabric can be prepared in one step with low cost.

[0027] 2. The present invention provides a process for preparing a hydrophobic and degradable cellulose-based non-woven fabric. The hydrophobic and degradable non-woven fabric produced by the production process has good strength and hydrophobic properties. Its maximum tensile breaking strength is 210-223N / 5 cm, its maximum elongation at break is 77%-79%, and its contact angle with water is 91°-93°. The hydrophobic effect varies from one year to five years depending on the hydrophobic modified material.

[0028] 3. The present invention provides a process for preparing a hydrophobic and degradable cellulose-based non-woven fabric. In view of the shortcomings of the products currently on the market that are non-degradable and cannot be completely degraded, the purpose of the present invention is to provide a one-step process for preparing a hydrophobic and degradable cellulose-based non-woven fabric, the degradation rate of which can reach 100%, and the hydrophobic modified material used undergoes a cross-linking reaction with the non-woven fabric fibers and can be degraded together with the non-woven fabric body without causing pollution to the environment. Therefore, this product can be used in fields such as land covering and sewer drainage systems.

[0029] Description of the drawings: Figure 1 It is a schematic diagram of the production process of the present invention.

[0030] Figure 2 This is a schematic diagram of the product structure produced by the production process of the present invention.

[0031] Among them, 1. solution reactor; 2. material extrusion system; 3. solution spray spinning system; 4. process hot nitrogen system; 5. receiving web forming system; 6. fiber web consolidation system; 7. hydrophobic modified coating system; 8. hydrophobic modified material; 9. non-woven fabric body. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0034] Embodiment 1: As shown in Figures 1 and 2, the embodiment of the present invention provides a process for preparing a hydrophobic and degradable cellulose-based non-woven fabric. The process system includes a material extrusion system 2, a solution spray spinning system 3, a process hot nitrogen system 4, a receiving web forming system 5, a fiber web consolidation system 6 and a hydrophobic modified coating system 7. The material extrusion system 2 is provided with a solution spray spinning system 3 at the rear end, the solution spray spinning system 3 is provided with a process hot nitrogen system 4 at the rear end, the solution spray spinning system 3 is provided with a receiving web forming system 5 at the lower end, the receiving web forming system 5 is provided with a fiber web consolidation system 6 and a hydrophobic modified coating system 7 at the lower end, and the process hot nitrogen system 4 is composed of a nitrogen heater, an airflow flowmeter and a compressed nitrogen tank.

[0035] The material extrusion system 2 includes a solution reactor 1, which can provide a solvent to dissolve pulp. The dissolved solution is used as a raw material for preparing non-woven fabrics and has degradable properties. The hydrophobic modification coating system 7 is used to coat some hydrophobic modification materials 8 on the formed fiber web. Finally, the fiber web consolidation system 6 is used to obtain a non-woven fabric body 9. The non-woven fabric body 9 is prepared by a one-step continuous process and has hydrophobicity.

[0036] In this embodiment, the above-mentioned spinning raw material is corn straw pulp / NMMO aqueous solution, the degree of polymerization of the spinning raw material is 458, the fluidity index of the spinning raw material is 10g / min~20g / min, the ash content of the spinning raw material is less than or equal to 200ppm, the water content of the spinning raw material is 10%~20%, the temperature of the spinning raw material is 105~120℃, and the hydrophobic modified material is a mixed solution of 5% sodium methyl silicate and 1% beeswax.

[0037] A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric comprises the following steps:

[0038] Step 1: Load the spinning raw materials into a solution reactor 1 isolated from oxygen, mix them evenly, and then pass the evenly mixed spinning raw materials through the material extrusion system 2;

[0039] Step 2: The spinning raw material is extruded from the material extrusion system 2 and output to the solution spinning system 3 through a metering device;

[0040] Step 3: The spinning material is ejected from the solution spinning system 3 under pressure, and the ejected spinning material is formed into fibers through the process hot nitrogen system 4 and laid on the receiving web forming system 5. The mechanism is as follows: after the spinning material is ejected from the solution spinning system 3, the 80-90°C hot air provided by the process hot nitrogen system 4 is evenly blown to the receiving web forming system 5, and the receiving web forming system 5 Providing a coagulation bath with 90-100° C. pure water as a raw material, thereby reducing the mass fraction of NMMO in the spinning raw material solution. During this process, the hydrogen bonds between NMMO and cellulose molecules in the spinning raw material solution are gradually broken, NMMO gradually forms hydrogen bonds with water molecules, the dissolving ability of the NMMO aqueous solution on cellulose is reduced, and cellulose is gradually precipitated, until the mass fraction of NMMO in the solution is reduced to below 78%, at which time the hydrogen bonds between NMMO and cellulose molecules in the solution are completely broken, NMMO completely forms hydrogen bonds with water molecules, the NMMO aqueous solution no longer has the ability to dissolve cellulose, and the cellulose is completely precipitated, the diluted NMMO aqueous solution is drained and recovered, and the solid fiber portion remaining on the receiving web forming system 5 is evenly distributed on the receiving web forming system 5 to form a fiber web;

[0041] Step 4: After the fiber web passes through the receiving web forming system 5, it passes through the hydrophobic modification coating system 7 containing the hydrophobic modification material 8, and the hydrophobic modification material 8 is coated on the fiber web at a temperature of 75-80°C, and finally passes through the fiber web consolidation system 6 to form a hydrophobic and degradable multi-performance non-woven fabric body 9.

[0042] The maximum tensile breaking strength of the nonwoven fabric body 9 is 223 N / 5 cm, the maximum elongation at break is 79%, the contact angle with water is 93°, and the hydrophobic performance lasts for up to one year.

[0043] The screw diameter of the material extrusion system 2 is 80~100mm, the aspect ratio of the screw is 10~15, the feeding section temperature of the screw is 105~120℃, and the compression section temperature of the screw is 105~120℃.

[0044] The temperature of the spinneret in the solution spinning system 3 is 105-120° C., the jet aperture of the spinneret is 200-500 nm, and the angle between the jetting direction of the spinning material and the airflow direction is 30-60 degrees.

[0045] The distance between the solution-jet spinning system 3 and the receiving web-forming system 5 is 200-800 mm.

[0046] Embodiment 2: As shown in Figures 1 and 2, the embodiment of the present invention provides a process for preparing a hydrophobic and degradable cellulose-based non-woven fabric. The process system includes a material extrusion system 2, a solution spray spinning system 3, a process hot nitrogen system 4, a receiving web forming system 5, a fiber web consolidation system 6 and a hydrophobic modified coating system 7. The material extrusion system 2 is provided with a solution spray spinning system 3 at the rear end, the solution spray spinning system 3 is provided with a process hot nitrogen system 4 at the rear end, the solution spray spinning system 3 is provided with a receiving web forming system 5 at the lower end, the receiving web forming system 5 is provided with a fiber web consolidation system 6 and a hydrophobic modified coating system 7 at the lower end, and the process hot nitrogen system 4 is composed of a nitrogen heater, an airflow flowmeter and a compressed nitrogen tank.

[0047] The material extrusion system 2 includes a solution reactor 1, which can provide a solvent to dissolve pulp. The dissolved solution is used as a raw material for preparing non-woven fabrics and has degradable properties. The hydrophobic modification coating system 7 is used to coat some hydrophobic modification materials 8 on the formed fiber web. Finally, the fiber web consolidation system 6 is used to obtain a non-woven fabric body 9. The non-woven fabric body 9 is prepared by a one-step continuous process and has hydrophobicity.

[0048] In this embodiment, the above-mentioned spinning raw material is coconut palm pulp / NMMO aqueous solution, the degree of polymerization of the spinning raw material is 450, the fluidity index of the spinning raw material is 10g / min~20g / min, the ash content of the spinning raw material is less than or equal to 200ppm, the water content of the spinning raw material is 10%~20%, the temperature of the spinning raw material is 105~120℃, and the hydrophobic modified material is a mixed solution of 8% potassium methyl silicate and 1% beeswax.

[0049] A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric comprises the following steps:

[0050] Step 1: Load the spinning raw materials into a solution reactor 1 isolated from oxygen, mix them evenly, and then pass the evenly mixed spinning raw materials through the material extrusion system 2;

[0051] Step 2: The spinning raw material is extruded from the material extrusion system 2 and output to the solution spinning system 3 through a metering device;

[0052] Step 3: The spinning material is ejected from the solution spinning system 3 under pressure, and the ejected spinning material is formed into fibers through the process hot nitrogen system 4 and laid on the receiving web forming system 5. The mechanism is as follows: after the spinning material is ejected from the solution spinning system 3, the 80-90°C hot air provided by the process hot nitrogen system 4 is evenly blown to the receiving web forming system 5, and the receiving web forming system 5 Providing a coagulation bath with 90-100° C. pure water as a raw material, thereby reducing the mass fraction of NMMO in the spinning raw material solution. During this process, the hydrogen bonds between NMMO and cellulose molecules in the spinning raw material solution are gradually broken, NMMO gradually forms hydrogen bonds with water molecules, the dissolving ability of the NMMO aqueous solution on cellulose is reduced, and cellulose is gradually precipitated, until the mass fraction of NMMO in the solution is reduced to below 78%, at which time the hydrogen bonds between NMMO and cellulose molecules in the solution are completely broken, NMMO completely forms hydrogen bonds with water molecules, the NMMO aqueous solution no longer has the ability to dissolve cellulose, and the cellulose is completely precipitated, the diluted NMMO aqueous solution is drained and recovered, and the solid fiber portion remaining on the receiving web forming system 5 is evenly distributed on the receiving web forming system 5 to form a fiber web;

[0053] Step 4: After the fiber web passes through the receiving web forming system 5, it passes through the hydrophobic modification coating system 7 containing the hydrophobic modification material 8, and the hydrophobic modification material 8 is coated on the fiber web at a temperature of 75-80°C, and finally passes through the fiber web consolidation system 6 to form a hydrophobic and degradable multi-performance non-woven fabric body 9.

[0054] The maximum tensile breaking strength of the non-woven fabric body 9 is 218 N / 5 cm, the maximum elongation at break is 77%, the contact angle with water is 93°, and the hydrophobic performance lasts for up to one year.

[0055] The screw diameter of the material extrusion system 2 is 80~100mm, the aspect ratio of the screw is 10~15, the feeding section temperature of the screw is 105~120℃, and the compression section temperature of the screw is 105~120℃.

[0056] The temperature of the spinneret in the solution spinning system 3 is 105-120° C., the jet aperture of the spinneret is 200-500 nm, and the angle between the jetting direction of the spinning material and the airflow direction is 30-60 degrees.

[0057] The distance between the solution-jet spinning system 3 and the receiving web-forming system 5 is 200-800 mm.

[0058] Embodiment 3: As shown in Figures 1 and 2, the embodiment of the present invention provides a process for preparing a hydrophobic and degradable cellulose-based non-woven fabric, the process system comprising a material extrusion system 2, a solution spray spinning system 3, a process hot nitrogen system 4, a receiving web forming system 5, a fiber web consolidation system 6 and a hydrophobic modified coating system 7. The material extrusion system 2 is provided with a solution spray spinning system 3 at the rear end, the solution spray spinning system 3 is provided with a process hot nitrogen system 4 at the rear end, the solution spray spinning system 3 is provided with a receiving web forming system 5 at the lower end, the receiving web forming system 5 is provided with a fiber web consolidation system 6 and a hydrophobic modified coating system 7 at the lower end, and the process hot nitrogen system 4 is composed of a nitrogen heater, an airflow flowmeter and a compressed nitrogen tank.

[0059] The material extrusion system 2 includes a solution reactor 1, which can provide a solvent to dissolve pulp. The dissolved solution is used as a raw material for preparing non-woven fabrics and has degradable properties. The hydrophobic modification coating system 7 is used to coat some hydrophobic modification materials 8 on the formed fiber web. Finally, the fiber web consolidation system 6 is used to obtain a non-woven fabric body 9. The non-woven fabric body 9 is prepared by a one-step continuous process and has hydrophobicity.

[0060] In this embodiment, the above-mentioned spinning raw material is reed straw pulp / NMMO aqueous solution, the degree of polymerization of the spinning raw material is 423, the fluidity index of the spinning raw material is 10g / min~20g / min, the ash content of the spinning raw material is less than or equal to 200ppm, the water content of the spinning raw material is 10%~20%, the temperature of the spinning raw material is 105~120℃, and the hydrophobic modified material is a mixed solution of 8% sodium methyl silicate and 1% beeswax.

[0061] A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric comprises the following steps:

[0062] Step 1: Load the spinning raw materials into a solution reactor 1 isolated from oxygen, mix them evenly, and then pass the evenly mixed spinning raw materials through the material extrusion system 2;

[0063] Step 2: The spinning raw material is extruded from the material extrusion system 2 and output to the solution spinning system 3 through a metering device;

[0064] Step 3: The spinning material is ejected from the solution spinning system 3 under pressure, and the ejected spinning material is formed into fibers through the process hot nitrogen system 4 and laid on the receiving web forming system 5. The mechanism is as follows: after the spinning material is ejected from the solution spinning system 3, the 80-90°C hot air provided by the process hot nitrogen system 4 is evenly blown to the receiving web forming system 5, and the receiving web forming system 5 Providing a coagulation bath with 90-100° C. pure water as a raw material, thereby reducing the mass fraction of NMMO in the spinning raw material solution. During this process, the hydrogen bonds between NMMO and cellulose molecules in the spinning raw material solution are gradually broken, NMMO gradually forms hydrogen bonds with water molecules, the dissolving ability of the NMMO aqueous solution on cellulose is reduced, and cellulose is gradually precipitated, until the mass fraction of NMMO in the solution is reduced to below 78%, at which time the hydrogen bonds between NMMO and cellulose molecules in the solution are completely broken, NMMO completely forms hydrogen bonds with water molecules, the NMMO aqueous solution no longer has the ability to dissolve cellulose, and the cellulose is completely precipitated, the diluted NMMO aqueous solution is drained and recovered, and the solid fiber portion remaining on the receiving web forming system 5 is evenly distributed on the receiving web forming system 5 to form a fiber web;

[0065] Step 4: After the fiber web passes through the receiving web forming system 5, it passes through the hydrophobic modification coating system 7 containing the hydrophobic modification material 8, and the hydrophobic modification material 8 is coated on the fiber web at a temperature of 75-80°C, and finally passes through the fiber web consolidation system 6 to form a hydrophobic and degradable multi-performance non-woven fabric body 9.

[0066] The maximum tensile breaking strength of the non-woven fabric body 9 is 210 N / 5 cm, the maximum elongation at break is 75%, the contact angle with water is 91°, and the hydrophobic performance lasts for up to one year.

[0067] The screw diameter of the material extrusion system 2 is 80~100mm, the aspect ratio of the screw is 10~15, the feeding section temperature of the screw is 105~120℃, and the compression section temperature of the screw is 105~120℃.

[0068] The temperature of the spinneret in the solution spinning system 3 is 105-120° C., the jet aperture of the spinneret is 200-500 nm, and the angle between the jetting direction of the spinning material and the airflow direction is 30-60 degrees.

[0069] The distance between the solution-jet spinning system 3 and the receiving web-forming system 5 is 200-800 mm.

[0070] Embodiment 4: As shown in Figures 1 and 2, the embodiment of the present invention provides a process for preparing a hydrophobic and degradable cellulose-based non-woven fabric, the process system comprising a material extrusion system 2, a solution spray spinning system 3, a process hot nitrogen system 4, a receiving web forming system 5, a fiber web consolidation system 6 and a hydrophobic modified coating system 7. The material extrusion system 2 is provided with a solution spray spinning system 3 at the rear end, the solution spray spinning system 3 is provided with a process hot nitrogen system 4 at the rear end, the solution spray spinning system 3 is provided with a receiving web forming system 5 at the lower end, the receiving web forming system 5 is provided with a fiber web consolidation system 6 and a hydrophobic modified coating system 7 at the lower end, and the process hot nitrogen system 4 is composed of a nitrogen heater, an airflow flowmeter and a compressed nitrogen tank.

[0071] The material extrusion system 2 includes a solution reactor 1, which can provide a solvent to dissolve pulp. The dissolved solution is used as a raw material for preparing non-woven fabrics and has degradable properties. The hydrophobic modification coating system 7 is used to coat some hydrophobic modification materials 8 on the formed fiber web. Finally, the fiber web consolidation system 6 is used to obtain a non-woven fabric body 9. The non-woven fabric body 9 is prepared by a one-step continuous process and has hydrophobicity.

[0072] In this embodiment, the above-mentioned spinning raw material is hemp pulp / NMMO aqueous solution, the degree of polymerization of the spinning raw material is 463, the fluidity index of the spinning raw material is 10g / min~20g / min, the ash content of the spinning raw material is less than or equal to 200ppm, the water content of the spinning raw material is 10%~20%, the temperature of the spinning raw material is 105~120℃, and the hydrophobic modified material is a mixed solution of 5% polymethyltriethoxysilane and 5% ethanol.

[0073] A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric comprises the following steps:

[0074] Step 1: Load the spinning raw materials into a solution reactor 1 isolated from oxygen, mix them evenly, and then pass the evenly mixed spinning raw materials through the material extrusion system 2;

[0075] Step 2: The spinning raw material is extruded from the material extrusion system 2 and output to the solution spinning system 3 through a metering device;

[0076] Step 3: The spinning material is ejected from the solution spinning system 3 under pressure, and the ejected spinning material is formed into fibers through the process hot nitrogen system 4 and laid on the receiving web forming system 5. The mechanism is as follows: after the spinning material is ejected from the solution spinning system 3, the 80-90°C hot air provided by the process hot nitrogen system 4 is evenly blown to the receiving web forming system 5, and the receiving web forming system 5 Providing a coagulation bath with 90-100° C. pure water as a raw material, thereby reducing the mass fraction of NMMO in the spinning raw material solution. During this process, the hydrogen bonds between NMMO and cellulose molecules in the spinning raw material solution are gradually broken, NMMO gradually forms hydrogen bonds with water molecules, the dissolving ability of the NMMO aqueous solution on cellulose is reduced, and cellulose is gradually precipitated, until the mass fraction of NMMO in the solution is reduced to below 78%, at which time the hydrogen bonds between NMMO and cellulose molecules in the solution are completely broken, NMMO completely forms hydrogen bonds with water molecules, the NMMO aqueous solution no longer has the ability to dissolve cellulose, and the cellulose is completely precipitated, the diluted NMMO aqueous solution is drained and recovered, and the solid fiber portion remaining on the receiving web forming system 5 is evenly distributed on the receiving web forming system 5 to form a fiber web;

[0077] Step 4: After the fiber web passes through the receiving web forming system 5, it passes through the hydrophobic modified coating system 7 containing the hydrophobic modified material 8, and the hydrophobic modified material 8 is coated on the fiber web at a temperature of 70-75°C, and finally passes through the fiber web consolidation system 6 to form a hydrophobic and degradable multi-performance non-woven fabric body 9.

[0078] The nonwoven fabric body 9 has a maximum tensile breaking strength of 220 N / 5 cm, a maximum elongation at break of 79%, a contact angle with water of 93°, and a hydrophobic performance of up to four years.

[0079] The screw diameter of the material extrusion system 2 is 80~100mm, the aspect ratio of the screw is 10~15, the feeding section temperature of the screw is 105~120℃, and the compression section temperature of the screw is 105~120℃.

[0080] The temperature of the spinneret in the solution spinning system 3 is 105-120° C., the jet aperture of the spinneret is 200-500 nm, and the angle between the jetting direction of the spinning material and the airflow direction is 30-60 degrees.

[0081] The distance between the solution-jet spinning system 3 and the receiving web-forming system 5 is 200-800 mm.

[0082] Embodiment 5: As shown in Figures 1 and 2, the embodiment of the present invention provides a process for preparing a hydrophobic and degradable cellulose-based non-woven fabric, the process system comprising a material extrusion system 2, a solution spray spinning system 3, a process hot nitrogen system 4, a receiving web forming system 5, a fiber web consolidation system 6 and a hydrophobic modified coating system 7. The material extrusion system 2 is provided with a solution spray spinning system 3 at the rear end, the solution spray spinning system 3 is provided with a process hot nitrogen system 4 at the rear end, the solution spray spinning system 3 is provided with a receiving web forming system 5 at the lower end, the receiving web forming system 5 is provided with a fiber web consolidation system 6 and a hydrophobic modified coating system 7 at the lower end, and the process hot nitrogen system 4 is composed of a nitrogen heater, an airflow flowmeter and a compressed nitrogen tank.

[0083] The material extrusion system 2 includes a solution reactor 1, which can provide a solvent to dissolve pulp. The dissolved solution is used as a raw material for preparing non-woven fabrics and has degradable properties. The hydrophobic modification coating system 7 is used to coat some hydrophobic modification materials 8 on the formed fiber web. Finally, the fiber web consolidation system 6 is used to obtain a non-woven fabric body 9. The non-woven fabric body 9 is prepared by a one-step continuous process and has hydrophobicity.

[0084] In this embodiment, the above-mentioned spinning raw material is bamboo pulp / NMMO aqueous solution, the degree of polymerization of the spinning raw material is 432, the fluidity index of the spinning raw material is 10g / min~20g / min, the ash content of the spinning raw material is less than or equal to 200ppm, the water content of the spinning raw material is 10%~20%, the temperature of the spinning raw material is 105~120℃, and the hydrophobic modified material is a mixed emulsion of 20% acrylic resin and 1% beeswax.

[0085] A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric comprises the following steps:

[0086] Step 1: Load the spinning raw materials into a solution reactor 1 isolated from oxygen, mix them evenly, and then pass the evenly mixed spinning raw materials through the material extrusion system 2;

[0087] Step 2: The spinning raw material is extruded from the material extrusion system 2 and output to the solution spinning system 3 through a metering device;

[0088] Step 3: The spinning material is ejected from the solution spinning system 3 under pressure, and the ejected spinning material is formed into fibers through the process hot nitrogen system 4 and laid on the receiving web forming system 5. The mechanism is as follows: after the spinning material is ejected from the solution spinning system 3, the 80-90°C hot air provided by the process hot nitrogen system 4 is evenly blown to the receiving web forming system 5, and the receiving web forming system 5 Providing a coagulation bath with 90-100° C. pure water as a raw material, thereby reducing the mass fraction of NMMO in the spinning raw material solution. During this process, the hydrogen bonds between NMMO and cellulose molecules in the spinning raw material solution are gradually broken, NMMO gradually forms hydrogen bonds with water molecules, the dissolving ability of the NMMO aqueous solution on cellulose is reduced, and cellulose is gradually precipitated, until the mass fraction of NMMO in the solution is reduced to below 78%, at which time the hydrogen bonds between NMMO and cellulose molecules in the solution are completely broken, NMMO completely forms hydrogen bonds with water molecules, the NMMO aqueous solution no longer has the ability to dissolve cellulose, and the cellulose is completely precipitated, the diluted NMMO aqueous solution is drained and recovered, and the solid fiber portion remaining on the receiving web forming system 5 is evenly distributed on the receiving web forming system 5 to form a fiber web;

[0089] Step 4: After the fiber web passes through the receiving web forming system 5, it passes through the hydrophobic modification coating system 7 containing the hydrophobic modification material 8, and the hydrophobic modification material 8 is coated on the fiber web at a temperature of 75-80°C, and finally passes through the fiber web consolidation system 6 to form a hydrophobic and degradable multi-performance non-woven fabric body 9.

[0090] The non-woven fabric body 9 has a maximum tensile breaking strength of 223 N / 5 cm, a maximum elongation at break of 79%, a contact angle with water of 93°, and a hydrophobic performance of up to five years.

[0091] The screw diameter of the material extrusion system 2 is 80~100mm, the aspect ratio of the screw is 10~15, the feeding section temperature of the screw is 105~120℃, and the compression section temperature of the screw is 105~120℃.

[0092] The temperature of the spinneret in the solution spinning system 3 is 105-120° C., the jet aperture of the spinneret is 200-500 nm, and the angle between the jetting direction of the spinning material and the airflow direction is 30-60 degrees.

[0093] The distance between the solution-jet spinning system 3 and the receiving web-forming system 5 is 200-800 mm.

[0094] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric, characterized in that: The invention comprises a material extrusion system (2), a solution spinning system (3), a process hot nitrogen system (4), a receiving web forming system (5), a fiber web consolidation system (6) and a hydrophobic modification coating system (7). The material extrusion system (2) is provided with a solution spinning system (3) at the rear end, the solution spinning system (3) is provided with a process hot nitrogen system (4) at the rear end, the solution spinning system (3) is provided with a receiving web forming system (5) at the lower end, the receiving web forming system (5) is provided with a fiber web consolidation system (6) and a hydrophobic modification coating system (7) at the lower end, and the process hot nitrogen system (4) is composed of a nitrogen heater, an air flow meter and a compressed nitrogen tank.

2. A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric according to claim 1, characterized in that: The material extrusion system (2) comprises a solution reactor (1), and the solution reactor (1) can be used to dissolve corn straw pulp, reed straw pulp, coconut palm pulp, hemp pulp, bamboo pulp, etc. with a solvent. The dissolved solution is used as a raw material for preparing non-woven fabrics and has a degradable property.

3. A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric according to claim 1, characterized in that: The hydrophobic modified coating system (7) is to coat the hydrophobic modified material (8) on the fiber web, thereby preparing a non-woven fabric body (9), and after coating, the non-woven fabric body (9) has hydrophobic properties, and the hydrophobic modified material (8) is a mixed solution or emulsion of an organosilicon hydrophobic material and beeswax or an alcohol substance in an appropriately proportioned manner.

4. A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric according to claim 1, characterized in that: The non-woven fabric body (9) is prepared by a one-step continuous process, firstly, the raw materials for preparing the non-woven fabric are prepared, then the fibers are prepared by a spinning process, and finally the non-woven fabric body (9) is prepared by a fiber web consolidation process system.

5. A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric according to claim 1, characterized in that: The following steps are involved: Step 1: Place the spinning raw materials into a solution reactor (1) isolated from oxygen, mix them evenly, and then pass them through the material extrusion system (2); Step 2: the spinning raw material is extruded from the material extrusion system (2), and is metered and output to the solution spinning system (3) through a metering device; Step 3, the spinneret raw material is ejected from the solution spinning system (3) under the action of negative pressure, and the ejected spinneret raw material is formed into a fiber web through the process hot nitrogen system (4) and laid on the receiving web system (5). The mechanism is as follows: after the spinneret raw material is ejected from the solution spinning system (3), it is evenly blown to the receiving web system (5) by the 88-90°C hot air provided by the process hot nitrogen system (4), and the receiving web system (5) provides a coagulation bath with 98-100°C pure water as raw material, thereby reducing the mass fraction of NMMO in the spinneret raw material solution. In this process, the NMMO in the spinneret raw material solution and the fiber are The hydrogen bonds between the cellulose molecules are gradually broken, and NMMO gradually forms hydrogen bonds with water molecules. The dissolving ability of the NMMO aqueous solution on cellulose decreases, and the cellulose gradually precipitates, until the mass fraction of NMMO in the solution decreases to below 78%. At this time, the hydrogen bonds between the NMMO and cellulose molecules in the solution are completely broken, and NMMO completely forms hydrogen bonds with water molecules. The NMMO aqueous solution no longer has the ability to dissolve cellulose, and the cellulose is completely precipitated. The diluted NMMO aqueous solution is drained and recovered, and the solid fiber portion remaining on the receiving web forming system (5) is evenly distributed on the receiving web forming system to form a fiber web; Step 4: After the fiber web passes through the receiving web forming system (5), it passes through a hydrophobic modified coating system (7) loaded with a hydrophobic modified material (8), and the hydrophobic modified material (8) is coated onto the fiber web at an appropriate temperature. Finally, it passes through a fiber web consolidation system (6) to form a hydrophobic and degradable multi-functional non-woven fabric body (9).

6. A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric according to claim 5, characterized in that: The screw diameter of the material extrusion system (2) is 80-100 mm, the aspect ratio of the screw is 10-15, and the temperature of the raw material in this system is maintained at 105-120°C.

7. A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric according to claim 5, characterized in that: The temperature of the spinneret in the solution spinning system (3) is 105-120° C., and the jet aperture of the spinneret is 200-500 nm.

8. A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric according to claim 5, characterized in that: The angle between the ejection direction of the spinneret raw material and the airflow direction is 30 to 60 degrees.

9. A process for preparing a hydrophobic and degradable cellulose-based nonwoven fabric according to claim 5, characterized in that: The distance between the spinneret in the solution jet spinning system (7) and the mesh curtain in the receiving mesh forming system (5) is 200-800 mm.

10. The hydrophobic modified material (8) according to claim 3, characterized in that: It includes aqueous solution type, which contains alkyl silicon alkoxide; solvent type, which mainly includes silane and silicone resin solution; emulsion type, which mainly exists in the form of silicone resin emulsion (or micropowder).

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