Dry and comfortable adult paper diaper and preparation method thereof
By combining modified wood pulp fibers and polymer water-absorbing resin, a three-layer core structure was prepared, which solved the problems of slow absorption, re-seepage and lump formation of traditional diapers, and achieved rapid absorption and stable structure dry diapers.
Patent Information
- Application Number
- CN202510673174.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-23
- Publication Date
- 2025-08-08
AI Technical Summary
The interface bonding force of the wood pulp fiber and polymer water-absorbing resin in the absorbing core layer of traditional diaper is weak, resulting in slow absorption speed, liquid retention in the surface of the surface and core lumps, affecting structural stability and dryness.
A three-layer core structure is prepared by a combination of modified wood pulp fibers and polymer water-absorbing resins by modifying wood pulp fibers through epoxy silane coupling agent and starch-based polyether polyol. The three-layer core structure is prepared by combining a specific ratio of polymer water-absorbing resins. The modified wood pulp fibers are quickly absorbed and diverted to drain excrement. The intermediate core layer has strong water absorption and water-locking properties, improving structural stability.
It realizes rapid absorption of excrement, reduces re-seepage, maintains dryness, prevents side leakage and lump formation, and improves the absorption ratio and structural stability of the absorbent core layer.
Smart Images
Figure CN120437356A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of sanitary products, and in particular to a dry adult diaper and a preparation method thereof. Background Art
[0002] The absorbent core layer of traditional diaper cores is usually made of wood pulp fibers and polymer absorbent resins. However, due to the weak interfacial bonding between the wood pulp fibers and the polymer absorbent resins in this type of absorbent core layer, problems such as slow absorption speed, liquid retention on the surface leading to reverse osmosis, and core lumping and fracture may occur, which is not conducive to obtaining structurally stable and dry diapers. Summary of the Invention
[0003] In order to improve the problems of back seepage and lumping in diapers in the related art, the present application provides a dry adult diaper and a preparation method thereof.
[0004] In the first aspect, the present application provides a dry adult diaper adopting the following technical solution: A dry diaper comprises a hydrophilic surface layer, a first adhesive layer, an absorbent core layer, a second adhesive layer and a waterproof and breathable bottom layer, which are arranged in sequence from top to bottom. The absorbent core layer comprises a core body and surface layers covering the upper and lower sides of the core body. The core body comprises an upper core body, an intermediate core body and a lower core body. The raw materials for preparing the upper and lower core bodies include 40-50wt% modified wood pulp fibers and 50-60wt% high molecular water-absorbent resin. The modified wood pulp fibers are obtained by modifying wood pulp fibers with an epoxy silane coupling agent and a starch-based polyether polyol. The high molecular water-absorbent resin is obtained by mixing sodium acrylate, glycidyl methacrylate, N,N'-methylenebisacrylamide, an initiator and water in a weight ratio of (30-40):(4-6):(3-5):(0.01-0.03):50. The intermediate core body is made of the high molecular water-absorbent resin.
[0005] In the present application, the core of the dry-type diaper is divided into three layers, namely the upper core, the middle core and the lower core. The upper core and the lower core are made of modified wood pulp fiber and a polymer water-absorbent resin made from specific raw materials, wherein the modified wood pulp fiber is obtained by modifying the wood pulp fiber with an epoxy silane coupling agent and a starch-based polyether polyol. It can quickly absorb excrement and divert the excrement to the middle core layer. The middle core layer has strong water absorption and water-locking properties, is not easy to re-seep, and is conducive to keeping dry. At the same time, the epoxy groups carried on the polymer water-absorbent resin can combine with the hydroxyl groups on the modified wood pulp fiber, improve the structural stability of the upper core and the lower core, and the structural stability between the middle core and the upper core and the lower core, which can prevent side leakage or lumping problems. In addition, the absorbent core layer in the diaper of the present application has a high absorption rate and is suitable for adults.
[0006] In some specific embodiments, in the modified wood pulp fiber, the weight ratio of the epoxy silane coupling agent, the starch-based polyether polyol, and the wood pulp fiber is (0.8-1.2):(3-4):1.
[0007] In the present application, the epoxy silane coupling agent and starch-based polyether polyol are used to modify the wood pulp fibers according to the above-mentioned ratio, which can accelerate the absorption speed of the absorbent core layer. At the same time, the modified wood pulp fibers can be stably combined with the polymer water-absorbent resin, which is beneficial to improving the structural stability of the upper core and the lower core, and can also improve the structural stability between the intermediate core and the upper core and the lower core.
[0008] In some specific embodiments, the preparation method of the starch-based polyether polyol is as follows: Starch, catalyst, liquefying agent and water are mixed according to the proportion, heated to 140-150°C and reacted for 3-4 hours, then cooled and filtered, and the filtrate is vacuum-dehydrated to obtain starch-based polyether polyol; The weight ratio of starch, catalyst, liquefying agent and water is 1:(0.04-0.05):(5-6):10.
[0009] In some specific embodiments, the catalyst is boron phosphate.
[0010] In some specific embodiments, the liquefier is glycerol.
[0011] In the present application, the liquefier is preferably glycerin, which is beneficial to further increase the absorption speed of the absorbent core layer.
[0012] In some specific embodiments, the thickness ratio of the upper core, the middle core and the lower core is (45-65):(10-25):(25-30).
[0013] In a second aspect, the present application provides a method for preparing a dry diaper using the following technical solution: A method for preparing dry diapers comprises the following steps: The modified wood pulp fiber and the high molecular water-absorbing resin are uniformly mixed and then molded to obtain an upper core body; Laying a high molecular weight water-absorbing resin on the surface of the upper core to form an intermediate core; The modified wood pulp fiber and the high molecular water-absorbing resin are uniformly mixed and molded to obtain a lower core body, and the lower core body is laid on the side of the middle core body away from the upper core body to obtain a core body; Covering the upper and lower surfaces of the core with surface layers to obtain an absorbent core layer; Laying a first adhesive layer on the surface of the hydrophilic surface layer, and the first adhesive layer is laminated with the surface of the absorbent core layer; A second adhesive layer is laid on the surface of the waterproof and breathable bottom layer, and the second adhesive layer is compounded with the side of the absorbent core layer facing away from the hydrophilic surface layer.
[0014] The first adhesive layer and the second adhesive layer are both hot melt adhesive layers, which promote stable bonding between the middle core and the upper core and the lower core during the lamination process and the composite process.
[0015] In some specific embodiments, the preparation method of the polymer water-absorbing resin is as follows: Sodium acrylate, glycidyl methacrylate and N,N'-methylenebisacrylamide are dispersed in water, and then an initiator is added dropwise. The temperature is controlled at 80-90°C and the reaction is carried out for 3.5-4.5 hours. After vacuum dehydration, the reaction is dried and crushed to obtain a high molecular water-absorbing resin.
[0016] In some specific embodiments, the preparation method of the modified wood pulp fiber is as follows: The epoxy silane coupling agent is dissolved in an alcohol solution, and then wood pulp fiber is added, and the temperature is raised to 40-50° C. to react for 1-2 hours, and then filtered, washed, and dried to obtain pre-modified wood pulp fiber; Add starch-based polyether polyol to pre-modified wood pulp fiber, mix evenly, heat to 120-140° C., stir and react for 1.5-2.5 hours, then filter, wash and dry the filter residue to obtain modified wood pulp fiber.
[0017] The present application first adopts epoxy silane coupling agent to graft-modify wood pulp fiber, and then utilizes the epoxy group on epoxy silane coupling agent to react with starch-based polyether polyol, which is beneficial to improving the modification stability of modified wood pulp fiber, preventing the problem of structural damage during the subsequent mixing of modified wood pulp fiber and polymer water-absorbent resin, and is beneficial to the uniform dispersion of modified wood pulp fiber and polymer water-absorbent resin. At the same time, it is also beneficial to the stable combination of modified wood pulp fiber and polymer water-absorbent resin, as well as the stable combination between the middle core and the upper core and the lower core.
[0018] In summary, this application has at least the following beneficial technical effects: 1. In the present application, the core of the dry-type diaper is divided into three layers, namely the upper core, the middle core and the lower core. The upper core and the lower core are made of modified wood pulp fiber and a polymer water-absorbent resin made from specific raw materials, wherein the modified wood pulp fiber is obtained by modifying the wood pulp fiber with an epoxy silane coupling agent and a starch-based polyether polyol, which can quickly absorb excrement and divert the excrement to the middle core layer. The middle core layer has strong water absorption and water-locking properties, is not easy to seep back, and is conducive to keeping dry. At the same time, the epoxy groups carried on the polymer water-absorbent resin can combine with the hydroxyl groups on the modified wood pulp fiber, thereby improving the structural stability of the upper core and the lower core, as well as the structural stability between the middle core and the upper core and the lower core, and can prevent side leakage or lumping problems.
[0019] (2) In the present application, the liquefier is preferably glycerin, which is beneficial to further increase the absorption speed of the absorbent core layer. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural diagram of the dry adult diaper of this application.
[0021] Figure 2 It is a structural schematic diagram of the absorbent core layer of this application.
[0022] Description of reference numerals: 1. Hydrophilic surface layer; 2. First adhesive layer; 3. Absorbent core layer; 31. Surface layer; 32. Core body; 321. Upper core body; 322. Middle core body; 323. Lower core body; 4. Second adhesive layer; 5. Waterproof and breathable bottom layer. DETAILED DESCRIPTION
[0023] The present application is further described below in conjunction with specific experiments.
[0024] Preparation Example of Starch-based Polyether Polyol [Preparation Example 1-1] A starch-based polyether polyol, the preparation method is as follows: 1 kg of starch, 0.004 kg of boron phosphate, 5 kg of a liquefier, and 10 kg of water were mixed, heated to 140°C, reacted for 4 hours, cooled, filtered, and the filtrate was vacuum-dehydrated to obtain a starch-based polyether polyol. Glycerol was used as the liquefier.
[0025] [Preparation Example 1-2] A starch-based polyether polyol, the preparation method is as follows: 1 kg of starch, 0.005 kg of boron phosphate, 6 kg of a liquefier, and 10 kg of water were mixed, heated to 150°C, reacted for 3 hours, cooled, filtered, and the filtrate was vacuum-dehydrated to obtain a starch-based polyether polyol. Glycerol was used as the liquefier.
[0026] [Preparation Examples 1-3] A starch-based polyether polyol, which differs from [Preparation Example 1-1] in that: Diethylene glycol is used as the liquefier.
[0027] [Preparation Examples 1-4] A starchy polyol, which differs from [Preparation Example 1-1] in that: The liquefier is propylene glycol.
[0028] Preparation example of modified wood pulp fiber [Preparation Example 2-1] A modified wood pulp fiber, the preparation method is as follows: 0.8 kg of γ-glycidyloxypropyltrimethoxysilane was dissolved in 20 kg of 60% ethanol aqueous solution, and then 1 kg of wood pulp fiber was added. The temperature was raised to 40° C. and reacted for 2 hours. The mixture was then filtered, and the filter residue was washed and dried to obtain pre-modified wood pulp fiber. Add 3 kg of starch-based polyether polyol prepared in [Preparation Example 1-1] to the pre-modified wood pulp fiber, mix evenly, heat to 120° C., stir and react for 2.5 hours, then filter, wash and dry the filter residue to obtain modified wood pulp fiber.
[0029] [Preparation Example 2-2] A modified wood pulp fiber, the preparation method is as follows: 1.2 kg of γ-glycidyloxypropyltrimethoxysilane was dissolved in 20 kg of 70% ethanol aqueous solution, and then 1 kg of wood pulp fiber was added. The temperature was raised to 50° C. and reacted for 1 hour. The mixture was then filtered, the filter residue was washed, and dried to obtain pre-modified wood pulp fiber. Add 4 kg of starch-based polyether polyol prepared in [Preparation Example 1-2] to the pre-modified wood pulp fiber, mix evenly, heat to 140° C., stir and react for 1.5 hours, then filter, wash and dry the filter residue to obtain modified wood pulp fiber.
[0030] [Preparation Example 2-3] A modified wood pulp fiber, which differs from [Preparation Example 2-1] in that the starch-based polyether polyol is the starch-based polyether polyol prepared in [Preparation Example 1-3].
[0031] [Preparation Example 2-4] A modified wood pulp fiber, which differs from [Preparation Example 2-1] in that the starch-based polyether polyol is the starch-based polyether polyol prepared in [Preparation Example 1-4].
[0032] [Preparation Example 2-5] A modified wood pulp fiber, which differs from [Preparation Example 2-1] in that starch-based polyether polyol is replaced by glycerol of equal mass.
[0033] [Preparation Example 2-6] A modified wood pulp fiber differs from [Preparation Example 2-1] in that the starch-based polyether polyol is replaced by an equal amount of polyfuran ether diol with a molecular weight of 1000.
[0034] Preparation example of polymer water-absorbing resin [Preparation Example 3-1] A high molecular water-absorbing resin is prepared from raw materials including 30 kg of sodium acrylate, 6 kg of glycidyl methacrylate, 3 kg of N,N'-methylenebisacrylamide, 0.01 kg of a sodium persulfate aqueous solution with a mass concentration of 0.1%, and 50 kg of water.
[0035] Wherein, the preparation method of polymer water-absorbing resin is as follows: Sodium acrylate, glycidyl methacrylate and N,N'-methylenebisacrylamide were dispersed in water, and then a 0.1% sodium persulfate aqueous solution was added dropwise. The temperature was controlled at 80°C for 4.5 hours. After vacuum dehydration, the mixture was dried and crushed to obtain a high molecular water-absorbing resin.
[0036] [Preparation Example 3-2] A high molecular water-absorbing resin is prepared from raw materials including 40 kg of sodium acrylate, 4 kg of glycidyl methacrylate, 5 kg of N,N'-methylenebisacrylamide, 0.03 kg of a sodium persulfate aqueous solution with a mass concentration of 0.1%, and 50 kg of water.
[0037] Wherein, the preparation method of polymer water-absorbing resin is as follows: Sodium acrylate, glycidyl methacrylate and N,N'-methylenebisacrylamide were dispersed in water, and then a sodium persulfate aqueous solution with a mass concentration of 0.1% was added dropwise. The temperature was controlled at 90°C for reaction for 3.5 hours. After vacuum dehydration, the mixture was dried and crushed to obtain a high molecular water-absorbing resin.
[0038] [Preparation Example 3-3] A high molecular water-absorbing resin is prepared from raw materials including 20 kg of sodium acrylate, 15 kg of glycidyl methacrylate, 6 kg of N,N'-methylenebisacrylamide, 0.01 kg of a sodium persulfate aqueous solution with a mass concentration of 0.1%, and 50 kg of water.
[0039] Wherein, the preparation method of polymer water-absorbing resin is as follows: Sodium acrylate, glycidyl methacrylate and N,N'-methylenebisacrylamide were dispersed in water, and then a 0.1% sodium persulfate aqueous solution was added dropwise. The temperature was controlled at 80°C for 4.5 hours. After vacuum dehydration, the mixture was dried and crushed to obtain a high molecular water-absorbing resin. Example
[0040] [Example 1] A dry diaper, referring to Figure 1 and Figure 2 It includes a hydrophilic surface layer, a first adhesive layer, an absorbent core layer, a second adhesive layer and a waterproof and breathable bottom layer arranged in sequence from top to bottom. The absorbent core layer includes a core body and surface layers covering the upper and lower sides of the core body. The core body includes an upper core body, a middle core body and a lower core body.
[0041] The upper and lower core layers are made from 40 wt% of the modified wood pulp fiber from [Preparation Example 2-1] and 60 wt% of the polymer water-absorbent resin from [Preparation Example 3-1], respectively. The middle core layer is made from the polymer water-absorbent resin from [Preparation Example 3-1]. The hydrophilic surface layer and the surface layers covering the upper and lower sides of the core are hydrophilic non-woven fabrics. The waterproof and breathable base layer is specifically a PE breathable base film. The first and second adhesive layers are both hot-melt adhesive layers.
[0042] In this embodiment, the preparation method of the dry diaper includes the following steps: The modified wood pulp fiber and the high molecular water-absorbing resin are uniformly mixed according to a ratio, and then molded to obtain an upper core body; Laying a high molecular weight water-absorbing resin on the surface of the upper core to form an intermediate core; The modified wood pulp fiber and the high molecular water-absorbing resin are uniformly mixed according to a ratio, and then molded to obtain a lower core body, and the lower core body is laid on the side of the middle core body away from the upper core body to obtain a core body; Covering the upper and lower surfaces of the core with surface layers to obtain an absorbent core layer; Laying a first adhesive layer on the surface of the hydrophilic surface layer, and the first adhesive layer is laminated with the surface of the absorbent core layer; A second adhesive layer is laid on the surface of the waterproof and breathable bottom layer, and the second adhesive layer is compounded with the side of the absorbent core layer facing away from the hydrophilic surface layer.
[0043] [Example 2] A dry diaper, which differs from [Example 1] in that: the upper core and the lower core are respectively made of 40wt% of the modified wood pulp fiber in [Preparation Example 2-2] and 60wt% of the high molecular water-absorbent resin in [Preparation Example 3-2], and the middle core is made of the high molecular water-absorbent resin in [Preparation Example 3-2].
[0044] [Example 3] A dry diaper, which differs from [Example 1] in that the modified wood pulp fibers in the upper core and the lower core are the modified wood pulp fibers prepared in [Preparation Example 2-3].
[0045] [Example 4] A dry diaper, which differs from [Example 1] in that the modified wood pulp fibers in the upper core and the lower core are the modified wood pulp fibers prepared in [Preparation Examples 2-4].
[0046] Comparative Example [Comparative Example 1] A diaper, which differs from [Example 1] in that the modified wood pulp fibers in the upper core and the lower core are the modified wood pulp fibers prepared in [Preparation Examples 2-5].
[0047] [Comparative Example 2] A diaper, which differs from [Example 1] in that the modified wood pulp fibers in the upper core and the lower core are the modified wood pulp fibers prepared in [Preparation Examples 2-6].
[0048] [Comparative Example 3] A diaper, which differs from [Example 1] in that the polymer water-absorbing resin adopts the polymer water-absorbing resin in [Preparation Example 3-3].
[0049] Performance testing 1. Absorption performance test: Referring to QB / T 5650-2021 "Composite absorbent core for disposable paper sanitary products", the absorbent core layer corresponding to the diapers in each embodiment and comparative example was subjected to an absorption rate test (immersion time is 30 minutes, hanging time is 10 minutes), an absorption speed test (100 mL of normal saline) and a rewet test. The test results are recorded in Table 1.
[0050] 2. Absorbent core layer stability test: Take the sample with completed absorption rate for stability test. When conducting the stability test, hang the sample vertically for 60 minutes (without support at the bottom) to observe whether clumping occurs.
[0051] Table 1 Absorption performance test Sample Absorption rate g / g Absorption rate Back seepage amount g Example 1 34.2 2.6 0.31 Example 2 34.6 2.3 0.34 Example 3 32.8 7.8 0.38 Example 4 33.1 6.2 0.35 Comparative Example 1 28.1 12.9 0.56 Comparative Example 2 27.3 15.6 0.63 Comparative Example 3 28.9 11.5 0.48 Table 2 Stability test Sample 60min 120 minutes Example 1 No lumps No lumps Example 2 No lumps No lumps Example 3 No lumps No lumps Example 4 No lumps No lumps Comparative Example 1 lumps lumps Comparative Example 2 lumps lumps Comparative Example 3 No lumps lumps Combining the test results in Example 1 and Comparative Example 1 and Tables 1 and 2, it can be seen that when the starch-based polyether polyol in the modified wood pulp fiber is replaced by glycerol, the absorption rate and absorption rate of the absorbent core layer are significantly reduced, and the backflow amount is increased, which is not conducive to obtaining dry diapers. In addition, the structural stability of the absorbent core layer is poor, and the problem of clumping is prone to occur.
[0052] Combining the test results in Example 1 and Comparative Example 2 and Tables 1 and 2, it can be seen that when the starch-based polyether polyol in the modified wood pulp fiber is replaced by polytetramethylene ether glycol, the absorption rate and absorption rate of the absorbent core layer are significantly reduced, and the back osmosis amount is increased, which is not conducive to obtaining dry diapers. In addition, the structural stability of the absorbent core layer is poor, and lumping problems are prone to occur.
[0053] Combining the test results of Example 1 and Comparative Example 3 and Tables 1 and 2, it can be seen that when the ratio of the raw materials in the polymer water-absorbent resin is not within the scope of this application, the absorption rate and absorption speed of the absorbent core layer are also significantly reduced, and the back seepage amount increases, which is not conducive to obtaining dry diapers.
[0054] Combining the test results of Example 1 and Examples 3-4 and Tables 1-2, it can be seen that when the liquefier is preferably glycerol, it is beneficial to improve the absorption rate and absorption speed of the absorption core layer.
[0055] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.
Claims
1. A dry diaper comprising, arranged in order from top to bottom, a hydrophilic surface layer, a first adhesive layer, an absorbent core layer, a second adhesive layer, and a waterproof and breathable backing layer, wherein the absorbent core layer comprises a core body and surface layers covering the upper and lower sides of the core body, characterized in that: The core comprises an upper core, an intermediate core and a lower core. The raw materials for preparing the upper and lower cores comprise 40-50 wt% of modified wood pulp fibers and 50-60 wt% of a high molecular water-absorbing resin. The modified wood pulp fibers are obtained by modifying wood pulp fibers with an epoxy silane coupling agent and a starch-based polyether polyol. The high molecular water-absorbing resin is obtained by a mixed reaction of sodium acrylate, glycidyl methacrylate, N,N'-methylenebisacrylamide, an initiator and water in a weight ratio of (30-40): (4-6): (3-5): (0.01-0.03):
50. The intermediate core is made of the high molecular water-absorbing resin.
2. The dry diaper according to claim 1, characterized in that: In the modified wood pulp fiber, the weight ratio of the epoxy silane coupling agent, the starch-based polyether polyol and the wood pulp fiber is (0.8-1.2): (3-4):
1.
3. The dry diaper according to claim 1, characterized in that: The preparation method of the starch-based polyether polyol is as follows: Starch, catalyst, liquefying agent and water are mixed according to the proportion, heated to 140-150°C and reacted for 3-4 hours, then cooled and filtered, and the filtrate is vacuum-dehydrated to obtain starch-based polyether polyol; The weight ratio of starch, catalyst, liquefying agent and water is 1: (0.004-0.005): (5-6):
10.
4. The dry diaper according to claim 3, characterized in that: The catalyst is boron phosphate.
5. The dry diaper according to claim 3, characterized in that: The liquefier is glycerol.
6. The dry diaper according to claim 1, characterized in that: The thickness ratio of the upper core, the middle core and the lower core is (45-65): (10-25): (25-30).
7. A method for preparing a dry diaper according to any one of claims 1 to 6, characterized in that: The following steps are involved: The modified wood pulp fiber and the high molecular water-absorbing resin are uniformly mixed and then molded to obtain an upper core body; Laying a high molecular weight water-absorbing resin on the surface of the upper core to form an intermediate core; The modified wood pulp fiber and the high molecular water-absorbing resin are uniformly mixed and molded to obtain a lower core body, and the lower core body is laid on the side of the middle core body away from the upper core body to obtain a core body; Covering the upper and lower surfaces of the core with surface layers to obtain an absorbent core layer; Laying a first adhesive layer on the surface of the hydrophilic surface layer, and the first adhesive layer is laminated with the surface of the absorbent core layer; A second adhesive layer is laid on the surface of the waterproof and breathable bottom layer, and the second adhesive layer is compounded with the side of the absorbent core layer facing away from the hydrophilic surface layer.
8. The method for preparing a dry diaper according to claim 7, wherein: The preparation method of the polymer water-absorbing resin is as follows: Sodium acrylate, glycidyl methacrylate and N,N'-methylenebisacrylamide are dispersed in water, and then an initiator is added dropwise. The temperature is controlled at 80-90°C and the reaction is carried out for 3.5-4.5 hours. After vacuum dehydration, the reaction is dried and crushed to obtain a high molecular water-absorbing resin.
9. The method for preparing a dry diaper according to claim 7, wherein: The preparation method of the modified wood pulp fiber is as follows: The epoxy silane coupling agent is dissolved in an alcohol solution, and then wood pulp fiber is added, and the temperature is raised to 40-50° C. to react for 1-2 hours, and then filtered, washed, and dried to obtain pre-modified wood pulp fiber; Add starch-based polyether polyol to pre-modified wood pulp fiber, mix evenly, heat to 120-140° C., stir and react for 1.5-2.5 hours, then filter, wash and dry the filter residue to obtain modified wood pulp fiber.