A large-capacity fast oil-absorbing paper towel for kitchen and a method for preparing the same
Through the synergistic design of a three-layer gradient structure and dual-functional modifiers, the problems of slow oil absorption rate, low oil holding capacity, and easy dripping of traditional oil-absorbing materials in the kitchen environment are solved. It achieves the effects of rapid oil absorption, ultra-high oil holding capacity, zero dripping, and reusability, and is suitable for kitchen oil stain cleaning, hot pan oil absorption, and oil draining pads for fried foods.
Patent Information
- Application Number
- CN202610165948.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-05
- Publication Date
- 2026-06-05
AI Technical Summary
Traditional oil-absorbing paper or cotton cloths have problems such as slow oil absorption rate, low oil holding capacity, easy dripping, inability to distinguish between oil and water, and non-reusability in home and restaurant kitchen environments. In addition, they lack intelligent response mechanisms for hot oil scenarios, resulting in low usage efficiency.
It adopts a three-layer gradient structure design, including a surface layer of micro-nano roughened oleophilic fiber nonwoven fabric, a middle layer of three-dimensional porous oil storage material with a porosity of greater than 90%, and a bottom layer of dense oleophilic but low-permeability cross-linked silicone rubber coating. It is connected by point hot pressing or ultrasonic local welding, combined with special bifunctional modifying agents, to achieve ultra-fast oil absorption, ultra-high oil retention, zero dripping and reusability.
It achieves comprehensive performance including rapid oil absorption, ultra-high oil holding capacity, zero dripping, and reusability. The micro-nano structure on the surface provides instant spreadability, the gradient channels in the middle layer provide huge oil storage space, and the dense barrier at the bottom layer prevents dripping. It is soft, heat-resistant, and has a long service life.
Smart Images
Figure CN122147726A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a method for preparing large-capacity, fast-absorbing oil-absorbing paper towels for kitchens, belonging to the technical field of functional textile materials and household cleaning products. Background Technology
[0002] In home and restaurant kitchens, oil stain removal is a frequent and essential need. Traditional oil-absorbing paper or cotton cloths suffer from slow oil absorption, low oil holding capacity, easy dripping, inability to distinguish between oil and water, and non-reusability. Existing improvements mostly focus on single surface modifications (such as applying an oleophilic coating), but these often lead to pore blockage, a hardened feel, poor durability, and difficulty in simultaneously achieving "rapid oil conduction" and "high oil storage capacity." Furthermore, the lack of an intelligent response mechanism for hot oil scenarios makes it ineffective in repelling condensation, reducing practical efficiency. Therefore, there is an urgent need to develop a new type of oil-absorbing fabric that integrates structure and function to overcome these technical bottlenecks. Summary of the Invention
[0003] To address the aforementioned technical problems, this invention provides a method for preparing large-capacity, fast-absorbing oil-absorbing paper towels for the kitchen. This fabric, through an innovative three-layer gradient structure design and the synergistic effect of special dual-functional modifying agents, achieves comprehensive performance including ultra-fast oil absorption, ultra-high oil retention, zero dripping, strong selectivity, and reusability.
[0004] The purpose of this invention is to provide a large-capacity, fast-absorbing oil-absorbing paper towel for the kitchen, comprising a top layer, a middle layer, and a bottom layer sequentially laminated from top to bottom; the top layer is an ultra-fine denier oleophilic fiber nonwoven fabric treated with micro-nano roughening and dual-functional modification, possessing both super-oleophilicity and thermally responsive hydrophobic selectivity; the middle layer is a three-dimensional porous oil-retaining material with a porosity greater than 90% and a gradient distribution of pore size; the bottom layer is a dense, oleophilic, but low-permeability cross-linked silicone rubber coated fabric; the three layers are physically connected by point-like hot pressing or ultrasonic local welding, and the pores between the layers remain interconnected.
[0005] The first objective of this invention is to provide a method for preparing large-capacity, fast-absorbing oil-absorbing paper towels for the kitchen, comprising the following steps:
[0006] S1. Provide a surface substrate, an intermediate substrate, and a bottom substrate respectively; the surface substrate is a nonwoven fabric made of oleophilic ultrafine denier fibers or a warp-knitted mesh fabric made of synthetic fibers; the intermediate substrate is a three-dimensional interconnected porous material; the bottom substrate is a cross-linked silicone rubber coated polyester fabric.
[0007] S2. Perform plasma etching on the surface substrate from step S1 to obtain a micro-nano roughened surface layer.
[0008] S3. Prepare the finishing solution, wherein the finishing solution contains C 12 -C 18The composition consists of long-chain alkyl acrylate copolymers, hydrophobic SiO2 nanoparticles, and thermally responsive fluoropolymers, with the balance being deionized water.
[0009] S4. The micro-nano roughened surface layer obtained in step S2 is impregnated with the finishing liquid in step S3, dried, and then baked to solidify, thus obtaining the modified surface layer.
[0010] S5. The modified surface layer from step S4, the intermediate substrate from step S1, and the bottom substrate are stacked in sequence, and then hot-pressed together using a dot-matrix method. After cooling and shaping, the layers are cut to obtain large-capacity, fast-absorbing oil-absorbing paper towels for kitchen use.
[0011] Preferably, the oil permeability of the underlying substrate is lower than that of the substrate itself. .
[0012] In one embodiment, the surface substrate in step S1 is a nonwoven fabric or nylon 6 warp-knitted mesh fabric composed of oleophilic ultrafine denier fibers. The average diameter of the fibers is 0.5-4.0 μm, the areal density of the surface substrate is 10-40 g / m², and the specific surface area is not less than 5 m² / g, thereby providing a rapid spreading and initial adsorption interface for greases. In a further preferred embodiment, the surface substrate in step S1 is an ultrafine denier polypropylene spunbond nonwoven fabric with a monofilament linear density of 0.8 dtex, an average fiber diameter of approximately 2-4 μm, a specific surface area of approximately 12 m² / g, and an areal density of 20 g / m².
[0013] In one embodiment, the intermediate layer substrate in step S1 is a three-dimensional interconnected porous material selected from open-cell polyurethane foam or electrospun nanofiber felt, with an overall porosity greater than 90% and a continuous gradient pore size distribution along the thickness direction without abrupt changes in step size. The pore size on the side near the surface is 5-20 μm, and the pore size on the side near the bottom layer is 50-200 μm.
[0014] In one embodiment, the underlying substrate in step S1 is a cross-linked silicone rubber coated polyester fabric. This is achieved by coating the surface of a polyester woven or knitted fabric with a silicone rubber coating primarily composed of methyl vinyl silicone rubber, followed by cross-linking and curing using thermal vulcanization or platinum catalysis to form a dense, elastic barrier layer. The silicone rubber coating thickness is 10-50 μm, and the oil permeability of the underlying substrate after coating is lower than [a certain value]. .
[0015] In one embodiment, the plasma etching process in step S2 is performed under an inert gas atmosphere, wherein the inert gas is argon, the processing power is 80-120 W, and the processing time is 30-90 s. Through plasma etching, a micro-nano-scale rough structure is constructed on the surface of the surface fiber, providing favorable conditions for the uniform adhesion of functional components in the subsequent finishing solution.
[0016] In one embodiment, the finishing solution in step S3 comprises: containing C 12 -C 18 Acrylate copolymers with long-chain alkyl side chains, which are composed of C 12 -C 18 It is a copolymer of alkyl acrylate monomers, acrylic acid or methacrylic acid, and optionally hydroxy acrylate or epoxy acrylate functional monomers, with a number average molecular weight Mn of 1×10⁻⁶. 4 - 5×10 5 The mass fraction of the fluoropolymer in the finishing solution is 5-15 wt% (g / mol); the hydrophobic SiO2 nanoparticles have an average particle size of 20-80 nm and are modified with alkylsilane or fluorosilane coupling agents, and their mass fraction in the finishing solution is 1-3 wt%; the thermoresponsive fluoropolymer is selected from fluorinated thermosensitive polymers with a low critical solution temperature (LCST) between 60 and 100 °C, preferably at least one of fluorinated polyether, fluorinated poly(N-isopropylacrylamide), or fluorosilicone resin containing azobenzene side chains; wherein the main chain of the fluorosilicone resin containing azobenzene side chains is a polysiloxane or fluorinated polysiloxane structure. The thermoresponsive fluoropolymer has a mass fraction of 2-5 wt% in the finishing solution, with the balance being deionized water; it undergoes a molecular conformational transformation within the temperature range of 60-100 °C, causing a change in surface energy and achieving a reversible switching between oleophilic and oleophobic states.
[0017] In one embodiment, the padding in step S4 employs a two-dip, two-roll process, with a finishing solution coverage of 70-90%. After finishing, the surface substrate is dried at 90-110 °C for 1-3 min, and then baked at 140-160 °C for 2-5 min to cure the acrylate copolymer and stably fix the nanoparticles to the fiber surface.
[0018] In one embodiment, the modified surface layer, intermediate layer substrate and bottom layer substrate described in step S5 are composited by a dot-matrix hot pressing method. The hot pressing temperature is 120-140 ℃, the pressure is 0.2-0.5 MPa, the dot density is 20-50 dots / cm², and the diameter of a single hot pressing dot is 0.5-1.5 mm.
[0019] In one embodiment of the present invention, the cut fabric can be further edge-sealed or die-cut to adapt to different kitchen usage scenarios.
[0020] A second objective of this invention is to provide a large-capacity, fast-absorbing oil-absorbing paper towel for kitchen use prepared by the aforementioned method. The resulting oil-absorbing paper towel has a static contact angle of approximately 5° to 6° with soybean oil; at 80°C, the complete absorption time for 5 g of soybean oil is approximately 0.9 s to 1.1 seconds, and the saturated oil holding capacity reaches 26.3 g / g to 28.6 g / g.
[0021] The third objective of this invention is to provide the application of the aforementioned large-capacity quick-absorbing oil-absorbing paper towels for kitchen use in cleaning kitchen oil stains, absorbing residual oil from hot pans, serving as a draining pad for fried foods, or as a liner for packaging high-oil foods.
[0022] The beneficial effects of this invention are:
[0023] This invention achieves superior comprehensive oil absorption performance through the synergistic design of a three-layer gradient structure and bifunctional modifying agents. The surface micro-nano structure and ultra-low surface energy endow it with instant spreading ability, while the thermally responsive coating enables intelligent selection of "absorbing only hot oil and repelling cold water"; the middle layer gradient channels provide a huge oil storage space and utilize the Laplace pressure gradient to lock in oil and prevent backflow; the bottom dense barrier completely eliminates dripping. The overall preparation process is gentle, does not damage the substrate, and the resulting fabric is soft, heat-resistant, and can be mechanically extruded and recycled more than 50 times, significantly superior to existing products. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the cross-sectional structure of the high-efficiency oil-absorbing paper towel prepared in Embodiment 1 of the present invention.
[0025] Figure 2 This is a physical image of Embodiment 1 of the present invention.
[0026] Figure 3 This refers to the contact angle in Embodiment 1 of the present invention. Detailed Implementation
[0027] The invention is further illustrated below with specific examples. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.
[0028] Raw material source:
[0029] The ultrafine denier modified polypropylene spunbond nonwoven fabric, polyvinylidene fluoride (PVDF), open-cell polyurethane foam, polyester woven fabric, octadecyl acrylate copolymer, hydrophobic SiO2 nanoparticles (30 nm particle size), fluorosilicone resin containing azobenzene side chains, and cross-linked methyl vinyl silicone rubber were all purchased from Aladdin Reagent Co., Ltd. or commercially available industrial-grade products.
[0030] Test method:
[0031] Contact angle test: The static contact angles of deionized water and soybean oil on the fabric surface were measured using a POWER 2000 contact angle measuring instrument.
[0032] Oil absorption rate: 5 g of soybean oil preheated to 80°C was dropped onto the center of the fabric, and the time for complete absorption was recorded.
[0033] Oil holding capacity: Weigh the dry sample by mass W0, and weigh it again after saturation and oil absorption by mass W1. Oil holding capacity = (W1 - W0) / W0 (g / g).
[0034] Drip test: After the fabric is saturated with oil, tilt it at 45° and observe for 30 minutes to see if any oil droplets fall.
[0035] Preparation method of finishing solution: The finishing solution used in this invention is used to functionalize the surface substrate of oil-absorbing paper towels, so as to construct a composite functional layer on its surface that combines super-oleophilicity, thermal response hydrophobic regulation capability, and structural stability. The finishing solution is prepared according to the following method: Weigh a certain amount of C... 12 -C 18 Long-chain alkyl acrylate copolymers are added to a predetermined amount of deionized water or a water-alcohol mixture and mechanically stirred at 300-500 rpm for 20-40 min at 25-40 °C to allow for full swelling and the formation of a homogeneous polymer solution. If necessary, ultrasonic dispersion for 5-10 min can be used to accelerate the uniform dissolution of the polymer. Hydrophobic SiO2 nanoparticles are slowly added to the polymer solution while stirring to avoid local agglomeration. Subsequently, ultrasonic dispersion is applied for 10-20 min to ensure uniform dispersion of the hydrophobic SiO2 nanoparticles in the system, forming a stable nanocomposite dispersion system. The average particle size of the hydrophobic SiO2 nanoparticles is preferably 20-50 nm, and their surface is modified with an alkylsilane coupling agent to enhance their compatibility with the long-chain alkyl acrylate copolymer. While maintaining continuous stirring, a thermoresponsive fluoropolymer is slowly added to the nanocomposite dispersion system, and stirring is continued for 15-30 min to ensure uniform dispersion at the molecular scale. The thermoresponsive fluoropolymer is preferably a fluorosilicone resin containing azobenzene side chains, which exhibits an oleophilic orientation at room temperature but undergoes molecular conformational adjustment under heating conditions of 60-100 °C, thereby forming a dynamic hydrophobic orientation structure at the oil-gas interface to improve oil-locking stability under high-temperature conditions. The mixed finishing solution is filtered through a 0.45 μm filter membrane to remove any possible trace amounts of gel or impurities; subsequently, it is allowed to stand for 10-30 min to eliminate air bubbles, resulting in a finishing solution with uniform appearance and good stability. The finishing solution can be stably stored at room temperature under sealed conditions for at least 24 h without additional treatment before use. The preferred mass percentage of each component in the finishing solution is: containing C... 12 -C 18Long-chain alkyl acrylate copolymer: 8-15 wt%; hydrophobic SiO2 nanoparticles: 1-3 wt%; thermoresponsive fluoropolymer: 2-5 wt%; balance is solvent. By adjusting the proportions of the above components, the oil absorption rate, oil retention, and high-temperature anti-drip performance can be precisely controlled without changing the basic formulation of the finishing solution.
[0036] After the finishing solution prepared by the above method is applied to the surface substrate, it can form a stable micro-nano composite structure and functional molecular orientation layer on the fiber surface, so that the resulting oil-absorbing paper towels can exhibit rapid oil absorption, high oil holding capacity and excellent anti-drip performance under both room temperature and high temperature conditions.
[0037] Example 1
[0038] Raw materials and parameters
[0039] The surface substrate is made of ultra-fine denier polypropylene spunbond nonwoven fabric with a single filament linear density of 0.8 dtex, an average fiber diameter of approximately 2-4 μm, a specific surface area of approximately 12 m² / g, and an areal density of 20 g / m². The intermediate layer substrate is made of open-cell polyurethane foam with an overall porosity of 92% and a thickness of 2.0 mm. The pore size exhibits a continuous gradient distribution along the thickness direction, with pore sizes ranging from 5-20 μm near the surface, gradually transitioning to 50-200 μm towards the interior, showing a continuous change without abrupt changes. The bottom substrate is a cross-linked silicone rubber-coated polyester fabric, which is obtained by coating woven polyester fabric with methyl vinyl silicone rubber and then cross-linking and curing it using platinum-catalyzed addition molding. The silicone rubber coating is approximately 30 μm thick. The finishing solution contains C... 12 -C 18 The long-chain alkyl acrylate copolymer was prepared by copolymerizing octadecyl acrylate and butyl acrylate, with a number-average molecular weight Mn of approximately 4.5 × 10⁻⁶. 4 The molecular weight distribution index is approximately 1.9, with a g / mol concentration. The hydrophobic SiO2 nanoparticles have an average particle size of 30 nm and are surface-modified with an alkylsilane coupling agent. The thermoresponsive fluoropolymer is a fluorosilicone resin containing azobenzene side chains. Its main chain is a polysiloxane structure, with azophenyl groups and fluorinated alkyl segments introduced into the side chains. It can undergo molecular conformational transformation in the range of 60-100 °C.
[0040] Preparation method
[0041] The surface substrate was placed in a plasma treatment chamber and treated at 100 W for 60 s under an argon atmosphere to etch the fiber surface and construct a micro-nano rough structure. A finishing solution was prepared, consisting of 10 wt% octadecyl acrylate copolymer, 2 wt% hydrophobic SiO2 nanoparticles, 3 wt% azobenzene side-chain fluorosilicone resin, and the balance being deionized water. The plasma-treated surface substrate was then impregnated with the finishing solution using a two-dip, two-roll process, with the liquid retention rate controlled at 80%. It was subsequently dried at 100℃ for 2 min and baked at 150℃ for 3 min to obtain the modified surface layer. The modified surface layer, intermediate layer, and bottom layer were sequentially stacked and hot-pressed at 130℃ and 0.3 MPa with a dot density of 30 dots / cm² for 30 s. After cooling and setting, the substrate was cut to obtain a large-capacity, fast-absorbing oil-absorbing paper towel for kitchen use.
[0042] Performance test results
[0043] Testing revealed that the prepared oil-absorbing paper towel exhibited a static contact angle of approximately 5° with soybean oil, demonstrating superoleophilic properties. At 80°C, the complete absorption time for 5 g of soybean oil was approximately 0.9 s, with a saturated oil holding capacity of 28.6 g / g. When the oil-saturated sample was tilted at 45° for 30 min, no oil droplets were observed to seep out, indicating excellent oil-locking and anti-drip properties.
[0044] Example 2
[0045] The preparation methods of Example 2 and Example 1 are basically the same, the only difference being the surface substrate, the intermediate substrate and some process parameters.
[0046] The surface substrate was replaced with a warp-knitted nylon 6 fabric with a single filament diameter of approximately 8 μm and an areal density of 25 g / m². The middle layer substrate was replaced with an electrospun polyvinylidene fluoride (PVDF) nanofiber felt with an average fiber diameter of approximately 500 nm and an overall porosity of approximately 93%. It exhibited a continuous gradient pore size distribution along the thickness direction without abrupt changes, with pore sizes of 5-20 μm near the surface and 50-200 μm near the bottom layer. The bottom layer remained a cross-linked silicone rubber-coated polyester fabric. The plasma treatment conditions were 120 W for 45 s. The finishing solution contained C... 16 The alkyl acrylate copolymer content was 12 wt%, the hydrophobic SiO2 content was 2.5 wt%, and the azobenzene side-chain fluorosilicone resin content was 4 wt%. The remaining preparation steps were the same as in Example 1.
[0047] Test results show that the oil contact angle is 6°, indicating good oleophilic spreading ability; under the same test conditions, the complete absorption time of soybean oil at 80°C is 1.1 seconds, showing excellent oil absorption kinetics; the oil holding capacity reaches 26.3 g / g, meeting the requirements for high-capacity adsorption; after tilting at 45° for 30 minutes, no oil droplets seep out, indicating that under the premise of meeting the requirements of oleophilicity and porous interconnected structure, different surface and intermediate layer materials can still achieve the technical effects of this invention.
[0048] Comparative Example 1
[0049] The preparation method of Comparative Example 1 is the same as that of Example 1, except that no fluorosilicone resin containing azobenzene side chains is added to the finishing solution, while the other conditions remain the same.
[0050] Test results show that the sample still has a contact angle of about 5° with oil, an oil absorption time of 0.9 s, and an oil holding capacity of 25.1 g / g. However, obvious oil droplets seeped out after about 10 minutes in the 45° tilt test, indicating that the lack of a thermally responsive hydrophobic control layer will significantly weaken the oil-locking stability.
[0051] Comparative Example 2
[0052] The preparation method of Comparative Example 2 is the same as that of Example 1, except that the intermediate layer substrate is made of ordinary open-cell polyurethane foam with uniform pore size, with an average pore size of about 100 μm and no gradient pore structure.
[0053] The sample performed normally in the initial oil absorption stage, with an oil absorption time of about 1.0 s and an oil holding capacity of 26.5 g / g. However, after being tilted at 45° for 10 min, continuous dripping occurred, indicating that the uniform pore structure could not form an effective Laplace pressure gradient to achieve deep oil locking.
[0054] Comparative Example 3
[0055] The formulations of the three-layer material and finishing liquid in Comparative Example 3 are the same as those in Example 1. The only difference is that the composite step uses a full-scale hot-press bonding method instead of a point-by-point hot-press composite.
[0056] Test results showed that the sample's oil absorption time was extended to 5.2 s, the oil holding capacity decreased to 18.4 g / g, and oil droplets appeared to seep out within 5 minutes, indicating that full adhesion would destroy the interlayer pore connectivity, thereby significantly reducing the oil absorption and oil retention performance.
[0057] The results of the above embodiments and comparative examples show that the present invention achieves rapid oil absorption, high oil holding capacity and excellent anti-drip performance through the synergistic design of surface micro-nano roughening and bifunctional modifying agents, intermediate continuous gradient porous structure and dot-like composite method. The absence of any key technical feature will lead to a significant decrease in performance.
Claims
1. A method for preparing a large-capacity, fast-absorbing oil-absorbing paper towel for kitchen use, characterized in that, The oil-absorbing paper towel has a three-layer gradient composite structure, comprising a top layer, a middle layer, and a bottom layer from top to bottom. The preparation method includes the following steps: S1. Provide a surface substrate, an intermediate substrate, and a bottom substrate respectively; the surface substrate is a nonwoven fabric made of oleophilic ultrafine denier fibers, or a warp-knitted mesh fabric made of synthetic fibers; the intermediate substrate is a three-dimensional interconnected porous material; the bottom substrate is a cross-linked silicone rubber coated polyester fabric. S2. Perform plasma etching on the surface substrate from step S1 to obtain a micro-nano roughened surface layer. S3. Prepare the finishing solution, wherein the finishing solution contains C 12 -C 18 The composition consists of long-chain alkyl acrylate copolymers, hydrophobic SiO2 nanoparticles, and thermally responsive fluoropolymers, with the balance being deionized water. S4. The micro-nano roughened surface layer obtained in step S2 is impregnated with the finishing liquid in step S3, dried, and then baked to solidify, thus obtaining the modified surface layer. S5. The modified surface layer from step S4, the intermediate substrate from step S1, and the bottom substrate are stacked in sequence, and then hot-pressed together using a dot-matrix method. After cooling and shaping, the layers are cut to obtain large-capacity, fast-absorbing oil-absorbing paper towels for kitchen use.
2. The method for preparing a large-capacity, fast-absorbing oil-absorbing paper towel for kitchen use according to claim 1, characterized in that, The surface substrate in step S1 is a nonwoven fabric or nylon 6 warp-knitted mesh fabric composed of oleophilic ultrafine denier fibers. The average diameter of the fibers is 0.5-4.0 μm, the areal density of the surface substrate is 10-40 g / m², and the specific surface area is not less than 5 m² / g.
3. The method for preparing a large-capacity, fast-absorbing oil-absorbing paper towel for kitchen use according to claim 1, characterized in that, The intermediate layer substrate mentioned in step S1 is a three-dimensional interconnected porous material selected from open-cell polyurethane foam or electrospun nanofiber felt. Its overall porosity is greater than 90%, and it has a continuous gradient pore size distribution along the thickness direction without step abrupt changes. The pore size on the side near the surface is 5-20 μm, and the pore size on the side near the bottom layer is 50-200 μm.
4. The method for preparing a large-capacity, fast-absorbing oil-absorbing paper towel for kitchen use according to claim 1, characterized in that, The underlying substrate in step S1 is a cross-linked silicone rubber coated polyester fabric. It is prepared by coating the surface of a polyester woven or knitted fabric with a silicone rubber coating primarily composed of methyl vinyl silicone rubber, and then cross-linking and curing it through thermal vulcanization or platinum catalysis to form a dense, elastic barrier layer. The thickness of the silicone rubber coating is 10-50 μm, and the oil permeability of the underlying substrate after coating is lower than... .
5. The method for preparing a large-capacity, fast-absorbing oil-absorbing paper towel for kitchen use according to claim 1, characterized in that, The plasma etching process described in step S2 is carried out in an inert gas atmosphere, wherein the inert gas is argon, the processing power is 80-120 W, and the processing time is 30-90 s.
6. The method for preparing a large-capacity, fast-absorbing oil-absorbing paper towel for kitchen use according to claim 1, characterized in that, The finishing solution described in step S3 contains C 12 -C 18 Long-chain alkyl side-chain acrylate copolymers are copolymerized from the following monomers: C 12 -C 18 The copolymer contains alkyl acrylate monomers, acrylic acid or methacrylic acid, and optionally hydroxy acrylate or epoxy acrylate functional monomers; the number average molecular weight Mn of the copolymer is 1 × 10⁻⁶. 4 - 5×10 5 g / mol, and its mass fraction in the finishing solution is 5-15 wt%; The hydrophobic SiO2 nanoparticles described in step S3 have an average particle size of 20-80 nm, their surface is hydrophobically modified by alkylsilane or fluorosilane coupling agents, and their mass fraction in the finishing solution is 1-3 wt%. The thermo-responsive fluoropolymer in step S3 is selected from fluorinated thermosensitive polymers with a low critical solution temperature (LCST) between 60 and 100°C, preferably at least one of fluorinated polyether, fluorinated poly(N-isopropylacrylamide), or fluorosilicone resin containing azobenzene side chains; the mass fraction of the thermo-responsive fluoropolymer in the finishing solution is 2-5 wt%.
7. The method for preparing a large-capacity, fast-absorbing oil-absorbing paper towel for kitchen use according to claim 1, characterized in that, In step S4, the immersion and rolling process adopts a two-immersion and two-rolling process with a liquid content of 70-90%, a drying temperature of 90-110 ℃ and a time of 1-3 min, and a baking temperature of 140-160 ℃ and a time of 2-5 min.
8. The method for preparing a large-capacity, fast-absorbing oil-absorbing paper towel for kitchen use according to claim 1, characterized in that, The point-like hot-pressing composite in step S5 has a temperature of 120-140 ℃, a pressure of 0.2-0.5 MPa, a point density of 20-50 points / cm², and a diameter of 0.5-1.5 mm for a single hot-pressing point.
9. A large-capacity, fast-absorbing oil-absorbing paper towel for the kitchen, characterized in that: The oil-absorbing paper towel is prepared by the preparation method according to any one of claims 1-8, and has a three-layer gradient composite structure consisting of a modified oleophilic surface layer, a continuous gradient porous intermediate oil storage layer, and a cross-linked silicone rubber barrier bottom layer.
10. A large-capacity, fast-absorbing oil-absorbing paper towel for the kitchen as described in claim 9, characterized in that, The prepared kitchen large-capacity quick-absorbing oil paper towels have a static contact angle of about 5°~6° with soybean oil; at 80 ℃, the complete absorption time of 5 g of soybean oil is about 0.9 s~1.1 seconds, and the saturated oil holding capacity is 26.3 g / g~28.6 g / g.
11. The application of the large-capacity, fast-absorbing oil-absorbing paper towels for kitchens as described in claim 9 or 10 in cleaning kitchen oil stains, absorbing hot oil, draining oil from fried foods, and packaging high-oil foods.