A spunlace nonwoven fabric for absorbent sanitary products and a method for manufacturing the same

Abstract

The present application belongs to the technical field of non-woven fabrics, and particularly relates to a spunlace non-woven fabric for absorbent sanitary products and a preparation method thereof. The spunlace non-woven fabric is formed by laminating and reinforcing a modified viscose fiber web and a polyester fiber web; the raw material of the modified viscose fiber web comprises 50-70 wt% modified viscose fibers and 30-50 wt% viscose fibers; the modified viscose fibers are obtained by pretreating viscose fibers by low-temperature plasma, and then immersing the obtained pretreated fibers in a monomer solution for surface grafting; the monomers in the monomer solution are compounded by unsaturated polyether and dienyl ether compounds at a molar ratio of 100:3-5. The modified viscose fiber web prepared by using the mixed fibers of modified viscose fibers and viscose fibers replaces the wiping layer prepared by traditional wood pulp fibers, and the prepared spunlace non-woven fabric has excellent water absorption and water retention performance, does not reverse osmosis, and also has excellent wet-state wear resistance.

Description

Technical Field

[0001] This invention belongs to the field of nonwoven fabric technology, specifically relating to a hydroentangled nonwoven fabric for absorbent hygiene products and its preparation method. Background Technology

[0002] Spunlace nonwoven fabric (also known as spunlace nonwoven or jet-spun fabric) is made by jetting a fiber web with high-pressure micro-jet water (water needle), allowing the fibers to self-lock into a fabric through physical entanglement. The entire process involves no chemical adhesives, resulting in a feel very close to traditional textiles. Spunlace nonwoven fabric combines the advantages of textiles, papermaking, plastics, and leather. Its process is environmentally friendly, causes minimal damage to fibers, and eliminates the need for adhesives, resulting in no shedding or pilling. The products exhibit excellent feel, drape, appearance, absorbency, and strength, making them reliable and hygienic. These characteristics make spunlace nonwoven fabric widely used in absorbent hygiene products, covering hundreds of applications including surgical supplies, medical care products, household and industrial products, and travel products.

[0003] Among various absorbent hygiene products, spunlace wipes (wiping cloths) have seen rapid development in recent years, with huge market demand. They are mainly divided into three categories: personal care wipes, industrial wipes, and household wipes. The core fibers of spunlace wipes are primarily absorbent and reinforcing fibers. Depending on the wiping scenario, appropriate functional fibers can be added. Absorbent fibers mainly include viscose fiber (regenerated cellulose fiber), wood pulp fiber, cotton fiber, and bamboo fiber. Reinforcing fibers mainly include polyester fiber, nylon fiber, and polypropylene fiber. Functional fibers mainly include chitosan fiber and seaweed fiber. Spunlace wipes are typically made of 1-5 layers of fiber webs, reinforced by hydroentangling, with the number of layers increasing according to functional requirements. With the rapid expansion of market demand, higher requirements have been placed on the output and performance of spunlace nonwoven fabrics, driving continuous improvement in spunlace nonwoven fabric preparation technology. For example, patent CN110983627B discloses a spunlace nonwoven fabric production process and its application, which uses viscose fiber and reinforcing fiber composites to prepare a single-layer spunlace nonwoven fabric. This nonwoven fabric has the advantages of low basis weight, high strength, and resistance to damage during use. However, the addition of reinforcing fibers results in a stiffer hand feel, reduced fineness, and poor skin-friendliness. Furthermore, the poor hydrophilicity of the reinforcing fibers can also... To reduce the water absorption of spunlace nonwoven fabrics, patent CN104389109B discloses a composite spunlace nonwoven fabric and its preparation method. This fabric is formed by laminating a non-wiping layer made of polyester fibers and a wiping layer made of wood pulp fibers into a double-layered fiber web, reinforced by hydroentangling. The wood pulp fibers are longer than 2 mm, making them less susceptible to being washed away during hydroentangling. Effective entanglement can be formed between the double-layered fiber web, resulting in sufficient wet strength. This overcomes the shortcomings of traditional wood pulp fibers, such as short fibers, high rigidity, and low wet strength, while retaining the inherent strong water absorption characteristics of wood pulp fibers. However, wood pulp fibers have loose cell walls, numerous pores, and are rich in hydrophilic hydroxyl groups (-OH), resulting in extremely strong water absorption. After absorbing water, water molecules combine with the hydroxyl groups, causing the fiber to swell. The hydrogen bonds between cellulose molecules are broken, disrupting the rigid structure originally maintained by hydrogen bonds, making the fiber softer. The loose, porous cell walls become more compressible after water absorption saturation. Under slight external pressure or wiping friction, these softened and swollen cell walls cannot provide effective structural support, causing the cell wall pores to be flattened and the fiber cross-section to be flattened from a circular or kidney-shaped shape, greatly reducing the liquid volume that can be contained. Due to the lack of elastic modulus like synthetic fibers, this physical deformation is plastic and irreversible. Even if the nonwoven fabric is unfolded again, its anti-backflow ability will still deteriorate.

[0004] Therefore, it is necessary to develop a spunlace nonwoven fabric that has both strong water absorption and water retention properties and does not backflow, in order to meet the performance requirements of spunlace wiping fabric. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an absorbent sanitary product made of spunlace nonwoven fabric and its preparation method. This invention uses a modified viscose fiber web, prepared from a mixture of modified viscose fibers and viscose fibers, to replace the traditional wood pulp fiber-based wiping layer. This avoids the problems of decreased water absorption and retention caused by using wood pulp fibers. Furthermore, the spunlace nonwoven fabric prepared from this modified viscose fiber web and polyester fiber web exhibits excellent water absorption and retention properties and does not backflow. The modified viscose fibers are obtained by grafting pretreated fibers pretreated with low-temperature plasma using monomers composed of unsaturated polyethers and diene ether compounds. The viscose fiber surface has a hydrophilic network structure formed by monomer copolymerization and crosslinking, ensuring the water absorption and retention properties of the spunlace nonwoven fabric. By controlling the percentage ratio of modified viscose fibers to viscose fibers, the spunlace nonwoven fabric can achieve excellent wet abrasion resistance.

[0006] To achieve the above objectives, the following technical solution is adopted:

[0007] An absorbent sanitary product is made of spunlace nonwoven fabric, which is formed by laminating and hydroentangling modified viscose fiber web and polyester fiber web. The raw materials of the modified viscose fiber web include 50-70 wt% modified viscose fiber and 30-50 wt% viscose fiber, with the total amount of modified viscose fiber and viscose fiber being 100 wt%. The modified viscose fiber is obtained by pretreating viscose fiber with low-temperature plasma, and then surface grafting the pretreated fiber into a monomer solution. The monomer in the monomer solution is composed of unsaturated polyether and diene ether compounds in a molar ratio of 100:3-5.

[0008] The grafting rate of the pretreated fibers is 14.8-19.7 wt%.

[0009] The inventors discovered that grafting viscose fibers with a blend of unsaturated polyethers and diene ethers as graft copolymer monomers can improve the anti-backflow properties of nonwoven fabrics. Within a certain range, the molar ratio of unsaturated polyethers to diene ethers determines the excellent elastic deformation capacity of the network structure formed by their copolymerization and crosslinking after water absorption. Dienyl ethers, due to the flexibility of their molecular chains, can act as crosslinking agents to construct a flexible crosslinked network structure. This structure can effectively convert external pressure into elastic deformation, thereby avoiding liquid seepage caused by stress concentration and improving the anti-backflow properties of nonwoven fabrics. However, excessive diene ethers can lead to over-crosslinking and decreased water absorption, while excessive unsaturated polyethers can result in sparse crosslinking points and decreased anti-backflow properties.

[0010] Modified viscose fiber is prepared by grafting a monomer composed of unsaturated polyethers and diene ethers onto pretreated fibers that have undergone low-temperature plasma pretreatment. The unsaturated polyethers and diene ethers can copolymerize and crosslink, forming a hydrophilic network structure on the surface of the viscose fiber. This network structure swells upon absorbing water, forming a hydration film of a certain thickness on the fiber surface. This reduces or even completely replaces the contact between fibers with the lubricating hydration film, making it easier for fibers to slip rather than resist friction through physical entanglement. This leads to a decrease in the abrasion resistance of the wet nonwoven fabric. By controlling the percentage of modified viscose fiber to viscose fiber, the continuity and distribution of the hydration film on the nonwoven fabric can be adjusted, finding the optimal balance between water absorption, water retention, and wet abrasion resistance.

[0011] The mass-to-volume ratio of the pretreated fiber to the monomer solution is 1 g: 40-50 mL. The total concentration of the two monomers, unsaturated polyether and diene ether compounds, in the monomer solution is 5-10 wt%.

[0012] The unsaturated polyether monomer is selected from at least one of allyl polyethylene glycol, methallyl polyoxyethylene ether, and isopentenyl polyoxyethylene ether, with a number average molecular weight of 1000-2400. The dienyl ether compound is selected from at least one of ethylene glycol diacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, tetraethylene glycol diacrylate, and pentaethylene glycol dimethacrylate, preferably at least one of diethylene glycol diacrylate, diethylene glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, and pentaethylene glycol dimethacrylate.

[0013] The solvent of the monomer solution is selected from at least one of water, methanol, ethanol, propanol, and isopropanol, preferably a mixed solvent of water and alcohol in a volume ratio of 85-95:5-15. The monomer solution also includes an initiator with a concentration of 0.05-0.1 mol / L. The initiator is selected from at least one of potassium persulfate, ammonium persulfate, and sodium persulfate.

[0014] The surface grafting conditions are: inert atmosphere, surface grafting at 60-80℃ for 3-5 hours.

[0015] The low-temperature plasma treatment conditions are as follows: fiber surface treatment temperature 25-100℃, gas flow rate 20-30 sccm, power 80-100W, vacuum degree 800-1500Pa, and discharge time 100-250s.

[0016] The gas is selected from at least one of pure argon, pure oxygen, and pure nitrogen.

[0017] The viscose fiber has a length of 30-50 mm and a fineness of 1.0-2.0 D.

[0018] The polyester fiber has a length of 30-50 mm and a fineness of 1.0-2.0 D.

[0019] The weight ratio of the modified viscose fiber web to the polyester fiber web is 3-5:3.

[0020] The absorbent sanitary products are made of spunlace nonwoven fabric with a basis weight of 30-100 g / m². 2 .

[0021] The pretreated fibers are then immersed in a monomer solution for surface grafting, followed by filtration, washing, and drying. The washing involves 1-3 washes with water, and the drying involves drying at 40-60°C to a constant weight.

[0022] The present invention also provides a method for preparing the above-mentioned absorbent sanitary products using spunlace nonwoven fabric, comprising the following steps:

[0023] 1) The modified viscose fiber and viscose fiber are opened, mixed, carded, and laid into a web to obtain a modified viscose fiber web;

[0024] 2) The polyester fibers are opened, combed, and laid into a web to obtain a polyester fiber web;

[0025] 3) The modified viscose fiber web and polyester fiber web are stacked, hydroentangled, dried, slit, wound, and packaged to obtain hydroentangled nonwoven fabric for absorbent hygiene products.

[0026] In step 2), the cross angle of the netting is 25°-35°.

[0027] In step 3), the hydroentangling involves rotating drums on both sides of the stacked fiber web; the number of rotating drums on the front side is 1-3, and the number of hydroentangling heads is 1-3; the number of rotating drums on the back side is 1-3, and the number of hydroentangling heads is 1-3; the hydroentangling pressure is 30-120 bar. The diameter of the hydroentangling needle holes in the water needle plate inside the hydroentangling head is 100-150 μm, and the density of hydroentangling needle holes is 18-20 per cm; the distance between the rotating drum and the water needle plate is 12-14 mm.

[0028] In step 3), the drying system is a two-stage drying system with a drying temperature of 85-100℃.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] This application uses a modified viscose fiber web, prepared from a mixture of modified viscose fibers and viscose fibers, to replace the traditional wood pulp fiber wiping layer. This avoids the problems of decreased water absorption and retention caused by using wood pulp fibers. Furthermore, the spunlace nonwoven fabric prepared from this modified viscose fiber web and polyester fiber web exhibits excellent water absorption and retention properties and does not backflow. The modified viscose fiber is obtained by grafting and modifying pretreated fibers that have undergone low-temperature plasma pretreatment with monomers composed of unsaturated polyethers and diene ether compounds. The surface of the viscose fiber has a hydrophilic network structure formed by monomer copolymerization and crosslinking, which ensures the water absorption and retention properties of the spunlace nonwoven fabric. By controlling the percentage ratio of modified viscose fiber to viscose fiber, the spunlace nonwoven fabric can obtain excellent wet abrasion resistance. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments, but is not limited to the contents of the specification. Unless otherwise specified, all "parts" mentioned in the embodiments of the present invention are parts by weight. All reagents used are commercially available in the art.

[0032] The viscose fiber has a length of 38mm and a fineness of 1.5D, and comes from Haiyan Jinyi Silk Spinning Co., Ltd.

[0033] The polyester fiber is 38mm in length and 1.4D fineness, and comes from Jiangyin Sanqiang Fiber Raw Material Co., Ltd.

[0034] Allyl polyethylene glycol A856836, number average molecular weight 1000, from Maclean's.

[0035] Allyl polyethylene glycol A874998, with a number average molecular weight of 2400, is from Maclean's.

[0036] Isoprene-based polyoxyethylene ether, with a number average molecular weight of 2400, is from Wuhan Jiyesheng Chemical Co., Ltd.

[0037] The wood pulp fiber is hardwood pulp fiber, purchased from Hangzhou Xiangfu Wood Pulp Fiber Manufacturing Co., Ltd., with an average length of 4.1 mm.

[0038] Example 1

[0039] 1) Viscose fibers were placed in a low-temperature plasma treatment device with a surface treatment temperature of 39°C. The oxygen flow rate was set to 30 sccm, the power to 80 W, the vacuum to 800 Pa, and the discharge time to 250 s. After pretreatment, the pretreated fibers were immersed in a monomer solution at a mass-to-volume ratio of 1:50 g / mL for surface grafting. The monomer solution included potassium persulfate as an initiator with a concentration of 0.1 mol / L. The monomer in the monomer solution was a mixture of allyl polyethylene glycol A856836 and tetraethylene glycol diacrylate at a molar ratio of 100:5, with a total monomer concentration of 10 wt%. The solvent was a mixed solvent of water and ethanol at a volume ratio of 85:15. The surface grafting conditions were: nitrogen atmosphere, surface grafting at 80°C for 3 h. After surface grafting, the fibers were filtered, washed three times with water, and dried at 60°C to constant weight to obtain modified viscose fibers.

[0040] 2) Open, blend, card, and cross-lay the 70 parts modified viscose fiber and 30 parts viscose fiber into a web, yielding a basis weight of 50 g / m². 2 Modified viscose fiber web;

[0041] 3) Open and comb the polyester fibers, then lay them in a 35° cross-web pattern to obtain a basis weight of 30 g / m². 2 polyester fiber web;

[0042] 4) The modified viscose fiber web and polyester fiber web are stacked, hydroentangled, dried, slit, wound, and packaged to obtain a basis weight of 66.8 g / m². 2 Absorbent hygiene products are made with spunlace nonwoven fabric. The spunlace process consists of two drums on the front side with three spunlace heads (numbered 1-3); and two drums on the back side with three spunlace heads (numbered 4-6). The spunlace pressure for head 1 is 40 bar; for head 2, it is 60 bar; for head 3, it is 110 bar; for head 4, it is 115 bar; for head 5, it is 110 bar; and for head 6, it is 110 bar. The pore size of the spunlace needles in the needle plate inside each head is 150 μm, and the needle density is 18 needles / cm. The distance between the drum and the needle plate is 14 mm. The drying temperature of the first-stage drying system is 85℃, and the drying temperature of the second-stage drying system is 100℃.

[0043] Example 2

[0044] The rest is the same as in Example 1, except that in step 2), the amount of modified viscose fiber is 50 parts and the amount of viscose fiber is 50 parts.

[0045] Example 3

[0046] The rest is the same as in Example 1, except that in step 1), allyl polyethylene glycol A856836 is replaced with an equimolar amount of allyl polyethylene glycol A874998.

[0047] Example 4

[0048] The rest is the same as in Example 1, except that in step 1), diethylene glycol diacrylate is used instead of tetraethylene glycol diacrylate in an equimolar amount.

[0049] Example 5

[0050] The rest is the same as in Example 1, except that in step 1), the monomer in the monomer solution is a mixture of allyl polyethylene glycol A856836 and tetraethylene glycol diacrylate in a molar ratio of 100:3.

[0051] Example 6

[0052] The rest is the same as in Example 1, except that in step 1), ethylene glycol diacrylate is used instead of tetraethylene glycol diacrylate in an equimolar amount.

[0053] Example 7

[0054] The rest is the same as in Example 1, except that in step 1), pentaethylene glycol dimethacrylate is used instead of tetraethylene glycol diacrylate in an equimolar amount.

[0055] Example 8

[0056] The rest is the same as in Example 1, except that in step 1), after the pretreatment is completed, the pretreated fibers are immersed in the monomer solution at a mass-volume ratio of 1:40 g / mL for surface grafting, and the total monomer concentration is 5 wt%.

[0057] Example 9

[0058] 1) Viscose fibers were placed in a low-temperature plasma treatment device with a fiber surface treatment temperature of 39°C. The oxygen flow rate was set to 20 sccm, the power to 100W, the vacuum degree to 1500Pa, and the discharge time to 100s. After pretreatment, the pretreated fibers were immersed in a monomer solution at a mass-volume ratio of 1:50 g / mL for surface grafting. The monomer solution included potassium persulfate as an initiator with a concentration of 0.1 mol / L. The monomer in the monomer solution was a mixture of isopentenyl polyoxyethylene ether and tetraethylene glycol diacrylate at a molar ratio of 100:5, with a total monomer concentration of 10 wt%. The solvent was a mixed solvent of water and ethanol at a volume ratio of 95:5. The surface grafting conditions were: nitrogen atmosphere, surface grafting at 60°C for 5 hours. After surface grafting, the fibers were filtered, washed three times with water, and dried at 60°C to constant weight to obtain modified viscose fibers.

[0059] 2) Open, blend, card, and cross-lay the 70 parts modified viscose fiber and 30 parts viscose fiber into a web, yielding a basis weight of 30 g / m². 2 Modified viscose fiber web;

[0060] 3) Open and comb the polyester fibers, then lay them in a 25° cross-web pattern to obtain a basis weight of 30 g / m². 2 polyester fiber web;

[0061] 4) The modified viscose fiber web and polyester fiber web are stacked, hydroentangled, dried, slit, wound, and packaged to obtain a basis weight of 50.2 g / m². 2 Absorbent hygiene products are made using spunlace nonwoven fabric. The spunlace process consists of: one front-side drum with two spunlace heads (numbered 1-2); one back-side drum with two spunlace heads (numbered 3-4); the spunlace pressure for head 1 is 40 bar; for head 2, it is 90 bar; for head 3, it is 100 bar; and for head 4, it is 90 bar. The pore size of the spunlace needles in the needle plate inside each head is 150 μm, with a needle density of 18 needles / cm²; the distance between the drum and the needle plate is 14 mm. The primary drying system operates at 85℃, and the secondary drying system operates at 100℃.

[0062] Comparative Example 1

[0063] The rest is the same as in Example 1, except that in step 2), the amount of modified viscose fiber is 30 parts and the amount of viscose fiber is 70 parts.

[0064] Comparative Example 2

[0065] The rest is the same as in Example 1, except that in step 2), the amount of modified viscose fiber is 80 parts and the amount of viscose fiber is 20 parts.

[0066] Comparative Example 3

[0067] The rest is the same as in Example 1, except that in step 2), the wood pulp fibers are opened, blended with cotton, combed, and laid in a 35° cross-web pattern to obtain a basis weight of 50 g / m². 2 Step 4) Replace the modified viscose fiber web with the wood pulp fiber web.

[0068] Comparative Example 4

[0069] The rest is the same as in Example 1, except that in step 2), an equimolar amount of N,N'-vinylbisacrylamide is used instead of tetraethylene glycol diacrylate.

[0070] Comparative Example 5

[0071] The rest is the same as in Example 1, except that in step 1), the monomer in the monomer solution is a mixture of allyl polyethylene glycol A856836 and tetraethylene glycol diacrylate in a molar ratio of 100:2.

[0072] Comparative Example 6

[0073] The rest is the same as in Example 1, except that in step 1), the monomer in the monomer solution is a mixture of allyl polyethylene glycol A856836 and tetraethylene glycol diacrylate in a molar ratio of 100:10.

[0074] The absorbent sanitary products prepared in the above embodiments and comparative examples were subjected to the following performance tests using spunlace nonwoven fabric.

[0075] 1. Water absorption and water retention: The test shall be conducted in accordance with GB / T24218.6-2010, Test Methods for Nonwoven Fabrics and Textiles. The nonwoven fabric shall be cut into 10cm×10cm pieces.

[0076] Water absorption: expressed as liquid absorption S (g / g), S0=(m1-m0) / m0, where m1 represents the mass of the nonwoven fabric after it has been soaked in distilled water for 10 minutes, taken out, vertically suspended on a copper wire mesh, and left to stand for 1 minute to drain excess water, m0 represents the mass of the nonwoven fabric before soaking, and S0 represents the maximum amount of water that a unit mass of nonwoven fabric can absorb.

[0077] Water retention: Water retention is measured under ambient temperature of 25℃, relative humidity of 60%, and standard atmospheric pressure. At regular intervals, the nonwoven fabric is tested for its moisture retention rate over time when it reaches a saturated liquid-holding state. A higher retention rate indicates better water retention. The nonwoven fabric, after being left to stand for 1 minute to drain excess water, is placed under ambient temperature of 25℃, relative humidity of 60%, and standard atmospheric pressure. At regular intervals, the liquid absorption S of the nonwoven fabric is measured. t S t =(m t -m0) / m0, m t S represents the mass of the nonwoven fabric at time t. t The numerical retention rate is calculated using / S0.

[0078] 2. Backflow Amount: The test was conducted according to the standard GB / T 24218.14-2010 Textiles - Test Methods for Nonwoven Fabrics. The sample was 12.5cm × 12.5cm. The nonwoven fabric was folded in half horizontally and vertically alternately 5 times along the center line. After each fold, the corresponding side length was divided by 2. The backflow amount was then tested. Backflow amount = m2 - m1; where m2 is the mass of the absorbent paper after backflow, in grams (g); and m1 is the initial mass of the absorbent paper, in grams (g).

[0079] 3. Wet abrasion resistance: According to standard ASTM D4966-22, using a Martindale abrasion tester, the sample size is a circle with a diameter of 3.8 cm. The abrasion resistance test is carried out at 25℃ and 100% relative humidity for 300 cycles.

[0080] Wear levels are determined based on a visual assessment scale of 1 to 5, with the scales defined as follows:

[0081] Level 5 - Excellent: Very few to zero fibers are removed from the structure.

[0082] Grade 4 - Very good: Small amounts of fiber may be in the form of pellets or loose threads.

[0083] Grade 3 - General: Medium amount of fiber and large or many loose threads.

[0084] Grade 2 - Poor: Numerous loose threads that can be easily removed.

[0085] Level 1 - Very Poor: Significant structural failure, holes, large loose threads that are easily removed.

[0086] 4. Grafting rate: The grafting rate of pretreated fibers is calculated using the following formula:

[0087] G = (m1 - m0) / m0

[0088] In the formula, m0 and m1 represent the mass of the pretreated fiber and the mass of the modified viscose fiber, respectively.

[0089] Table 1 Performance Test Results

[0090]

[0091] As can be seen from Table 1, the spunlace nonwoven fabric prepared in this application has low backflow and excellent water absorption, water retention and wet abrasion resistance. The water absorption is 6.2-8.1, the water retention is 92.5-96.7%, the wet abrasion resistance is 3-5, and the backflow is 0.02-0.13g.

[0092] The above detailed description is a specific description of one of the feasible embodiments of the present invention. This embodiment is not intended to limit the patent scope of the present invention. All equivalent implementations or modifications that do not depart from the present invention should be included within the scope of the technical solution of the present invention.

Claims

1. An absorbent sanitary product made of spunlace nonwoven fabric, characterized in that, It is made of modified viscose fiber web and polyester fiber web through lamination and hydroentangling reinforcement; the raw materials of the modified viscose fiber web include: 50-70wt% modified viscose fiber and 30-50wt% viscose fiber, with the total amount of modified viscose fiber and viscose fiber being 100wt%; the modified viscose fiber is obtained by pretreating viscose fiber with low-temperature plasma, and then immersing the pretreated fiber in a monomer solution for surface grafting; the monomer in the monomer solution is composed of unsaturated polyether and diene ether compounds in a molar ratio of 100:3-5.

2. The absorbent sanitary product according to claim 1, made of spunlace nonwoven fabric, is characterized in that, The grafting rate of the pretreated fibers is 14.8-19.7 wt%.

3. The absorbent sanitary product according to claim 1, made of spunlace nonwoven fabric, is characterized in that, The mass-to-volume ratio of the pretreated fiber to the monomer solution is 1g:40-50mL; the total concentration of the two monomers, unsaturated polyether and diene ether compounds, in the monomer solution is 5-10wt%.

4. The absorbent sanitary product according to claim 1, made of spunlace nonwoven fabric, is characterized in that, The unsaturated polyether monomer is selected from at least one of allyl polyethylene glycol, methallyl polyoxyethylene ether, and isopentenyl polyoxyethylene ether, with a number average molecular weight of 1000-2400; the dienyl ether compound is selected from at least one of ethylene glycol diacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, tetraethylene glycol diacrylate, and pentaethylene glycol dimethacrylate, preferably at least one of diethylene glycol diacrylate, diethylene glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, and pentaethylene glycol dimethacrylate.

5. The absorbent sanitary product according to claim 1, made of spunlace nonwoven fabric, is characterized in that, The surface grafting conditions are: inert atmosphere, surface grafting at 60-80℃ for 3-5 hours; the low-temperature plasma treatment conditions are: fiber surface treatment temperature 25-100℃, gas flow rate 20-30 sccm, power 80-100W, vacuum degree 800-1500Pa, discharge time 100-250s; the gas is selected from at least one of pure argon, pure oxygen, and pure nitrogen.

6. The absorbent sanitary product according to claim 1, made of spunlace nonwoven fabric, is characterized in that, The viscose fiber has a length of 30-50 mm and a fineness of 1.0-2.0D; the polyester fiber has a length of 30-50 mm and a fineness of 1.0-2.0D.

7. The absorbent sanitary product according to claim 1, made of spunlace nonwoven fabric, is characterized in that, The basis weight ratio of the modified viscose fiber web to the polyester fiber web is 3-5:3; the basis weight of the spunlace nonwoven fabric used in the absorbent sanitary products is 30-100 g / m². 2 .

8. The absorbent sanitary product according to claim 1, made of spunlace nonwoven fabric, is characterized in that, The resulting pretreated fibers are then immersed in a monomer solution for surface grafting, followed by filtration, washing, and drying post-treatment operations.

9. A method for preparing the absorbent sanitary product using spunlace nonwoven fabric according to any one of claims 1-8, characterized in that, Includes the following steps: 1) The modified viscose fiber and viscose fiber are opened, mixed, carded, and laid into a web to obtain a modified viscose fiber web; 2) The polyester fibers are opened, combed, and laid into a web to obtain a polyester fiber web; 3) The modified viscose fiber web and polyester fiber web are stacked, hydroentangled, dried, slit, wound, and packaged to obtain hydroentangled nonwoven fabric for absorbent hygiene products.

10. The method for preparing the absorbent sanitary product using spunlace nonwoven fabric according to claim 9, characterized in that, In step 3), the hydroentangling is performed on both sides of the laminated fiber web using rotating drums; the number of rotating drums on the front side is 1-3, and the number of hydroentangling heads is 1-3; the number of rotating drums on the back side is 1-3, and the number of hydroentangling heads is 1-3; the hydroentangling pressure is 30-120 bar; the diameter of the hydroentangling needle holes in the water needle plate inside the hydroentangling head is 100-150 μm, and the density of hydroentangling needle holes is 18-20 per cm; the distance between the rotating drum and the water needle plate is 12-14 mm.

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