Composite spunlace nonwoven wet wipe

Abstract

The application discloses a composite water-jet non-woven fabric wet tissue, which comprises a first water-jet non-woven fabric, a moisturizing layer and a second water-jet non-woven fabric arranged in sequence from top to bottom, and the first water-jet non-woven fabric, the moisturizing layer and the second water-jet non-woven fabric are integrated by water-jet reinforcement; the first water-jet non-woven fabric and the second water-jet non-woven fabric are obtained by pre-opening, fine opening, carding, water-jet reinforcement, hydrophilic soft finishing and setting finishing of chitin fibers; the moisturizing layer is obtained by opening, mixing, carding, water-jet reinforcement and post-finishing of seaweed fibers and wood pulp fibers respectively; the non-woven fabric wet tissue prepared by the application has a degradable effect and meets the requirement of environmental protection; the seaweed fibers and the wood pulp fibers in the moisturizing layer have good moisture absorption and moisture retention performance, the moisture retention effect of the moisturizing layer is improved, the moisture content of the non-woven fabric wet tissue is ensured, and the use requirement of the wet tissue is met.

Description

Technical Field

[0001] This invention belongs to the field of wet wipe preparation, and specifically relates to a composite spunlace nonwoven wet wipe. Background Technology

[0002] Currently, the wet wipes on the market are mainly made of spunlace nonwoven fabric, and the materials used are mainly pure cotton, viscose, polyester, etc. Nonwoven fabric, also known as non-woven cloth, is a new generation of environmentally friendly materials. Spunlace nonwoven fabric is made by spraying high-pressure micro-jet water onto one or more layers of fiber web, causing the fibers to entangle together, thereby strengthening the web and giving it a certain strength. The resulting fabric is spunlace nonwoven fabric.

[0003] The future trend of wet wipes will undoubtedly be towards biodegradable and environmentally friendly materials. However, wet wipes on the market often use wipes made with polyester, but these wipes do not meet environmental protection requirements; moreover, these wipes are not soft enough, which has a significant impact on the user experience, especially for makeup remover wipes and baby wipes; further improvements are needed. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a composite spunlace nonwoven wet wipe.

[0005] The present invention adopts the following technical solution:

[0006] A composite spunlace nonwoven wipe includes a first spunlace nonwoven fabric, a moisturizing layer, and a second spunlace nonwoven fabric arranged sequentially from top to bottom. The first spunlace nonwoven fabric, the moisturizing layer, and the second spunlace nonwoven fabric are bonded together by spunlace reinforcement. The first and second spunlace nonwoven fabrics are obtained from chitin fibers through pre-opening, fine opening, carding, spunlace reinforcement, hydrophilic softening finishing, and shaping finishing. The moisturizing layer is obtained from seaweed fibers and wood pulp fibers through opening, mixing, carding, spunlace reinforcement, and finishing processes, respectively. The weight ratio of seaweed fibers to wood pulp fibers is 1:0.25-0.35.

[0007] Preferably, the method for preparing the chitin fiber specifically includes the following steps:

[0008] Step 1: Add chitin powder to an acid solution and soak for 8-12 hours; during the process, ultrasonic stirring is performed simultaneously to obtain mixture a.

[0009] Step 2: Filter the mixture a to obtain mixture a, then add an alkaline solution to the acid-treated chitin powder and soak it for 4-6 hours. During the process, ultrasonic stirring is performed to obtain mixture b.

[0010] Step 3: Filter the mixture b to obtain mixture b. Then, mix mixture b, nanocellulose, and sodium lignosulfonate in a mass ratio of 10:2-4:6-8 until homogeneous. Add sodium hydroxide solution and mix until homogeneous. Then, perform degassing and washing treatments in sequence. Finally, perform spinning to obtain the chitin fiber. The amount of sodium hydroxide added is 3-4 times the mass of sodium lignosulfonate, and the mass fraction of sodium hydroxide is 30%.

[0011] Preferably, in step 1, the ratio of chitosan powder to acid solution is 1g:30-36mL; in step 2, the ratio of mixture a to alkaline solution is 1g:45-48mL.

[0012] Preferably, the acid solution is a hydrochloric acid solution with a mass fraction of 15%; and the alkaline solution is a sodium hydroxide solution with a mass fraction of 25%.

[0013] Preferably, in steps 1 and 2, during the soaking treatment, the ultrasonic power density of the ultrasonic stirring is 120-125 W / L, and the ultrasonic frequency is 70-77 kHz.

[0014] Preferably, in step 3, the spinning operation adopts the traditional chemical fiber preparation process.

[0015] Preferably, when using hydroentanglement to reinforce composites, the number of hydroentanglement heads is 15-18, the pore size of the hydroentanglement plate is 0.12-0.15mm, the density is 15-18 per cm, and the water pressure is 80-100 bar.

[0016] Preferably, the hydrophilic softening finishing process is specifically operated as follows: the chitin fibers obtained by hydroentanglement are placed in a softening finishing solution, and first finished at a temperature of 30-40℃ for 10-20 minutes; then the temperature is raised to 50-60℃ and finished for 20-30 minutes, and the solution is drained; then it is washed in water at 35-45℃ for more than 15 minutes to complete the hydrophilic softening finishing of the chitin fiber cloth.

[0017] Preferably, the softening finishing liquid includes 2-3 g / L of penetrant JFC and 15-18 g / L of hydrophilic silicone oil T718.

[0018] Preferably, the specific operation of the finishing process is as follows: the hydrophilically treated fiber cloth is placed in the finishing solution in the finishing machine for finishing, the finishing temperature is 160-170℃, the machine speed is 12-16m / min, wherein the finishing solution contains 0.2-0.4% antistatic agent and 0.1-0.2% penetrant JFC.

[0019] As can be seen from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are:

[0020] The wet wipes prepared in this application are obtained by hydroentangling a first spunlace nonwoven fabric, a moisturizing layer, and a second spunlace nonwoven fabric. The first spunlace nonwoven fabric, the second spunlace nonwoven fabric, and the moisturizing layer are made of biodegradable chitin fiber, seaweed fiber, and wood pulp fiber, respectively. Chitin fiber, seaweed fiber, and wood pulp fiber are all biodegradable fibers, which enables the prepared nonwoven wet wipes to have a biodegradable effect and meet the requirements of environmental protection. Furthermore, the seaweed fiber and wood pulp fiber have good moisture absorption and moisturizing properties, which can improve the moisturizing effect of the moisturizing layer, thereby ensuring the moisture content of the nonwoven wet wipes and meeting the usage requirements of wet wipes.

[0021] Specifically, the preparation process of chitin fiber involves first acidifying and alkalizing chitin, then mixing it evenly with nanocellulose and sodium lignosulfonate to improve the strength of the prepared chitin fiber. The addition of nanocellulose, combined with the treated chitin, can compensate for the poor strength of existing chitin fibers without affecting their biodegradability. The introduction of sodium lignosulfonate ensures uniform mixing of all substances, guaranteeing the performance of the prepared chitin fiber.

[0022] Specifically, the hydrophilic softening process is defined, and the hydrophilic silicone oil is gradually penetrated into the fiber cloth through a step-by-step heating method. This gives the prepared spunlace nonwoven fabric a fluffy, soft, silky, and elastic feel, improving the softness of the first and second spunlace nonwoven fabrics and meeting the usage requirements of makeup remover wipes and baby wipes. Detailed Implementation

[0023] The present invention will be further described below through specific embodiments.

[0024] A composite spunlace nonwoven wet wipe includes a first spunlace nonwoven fabric, a moisturizing layer, and a second spunlace nonwoven fabric arranged sequentially from top to bottom; wherein the first spunlace nonwoven fabric, the moisturizing layer, and the second spunlace nonwoven fabric are reinforced and composited together by a hydroentangling method. During the hydroentangling reinforcement and composite process, the number of hydroentanglement heads is 15-18, the pore size of the hydroentanglement plate is 0.12-0.15mm, the density is 15-18 heads / cm, and the water pressure is 80-100 bar.

[0025] The first and second spunlace nonwoven fabrics are obtained from chitosan fibers through pre-opening, fine opening, carding, hydroentanglement reinforcement, hydrophilic softening finishing and shaping finishing; the specific preparation method is as follows: (1) Chitosan fibers are weighed and quantitatively transported to the pre-opening machine for pre-opening, and then sent to the opening machine for fine opening; (2) The degradable composite fibers that have completed fine opening are carded to form a fiber web; (3) The obtained fiber web is sent to the hydroentanglement zone for reinforcement treatment to obtain fiber cloth, and then the fiber cloth is sequentially subjected to hydrophilic softening finishing and shaping finishing to obtain spunlace nonwoven fabric.

[0026] Specifically, during the pre-opening of chitosan fibers, the fibers are first immersed in a pretreatment solution for 15 minutes. Then, the liquid content of the biodegradable composite fibers is controlled at 25%, and the fibers are fed into a coarse opener for pre-opening. The pretreatment solution contains 2 g / L of dispersant, 1 g / L of penetrant JFC, and 1.2 g / L of refining and degreasing agent. By limiting the pre-opening process, the chitosan fibers are immersed in the pretreatment solution for a period of time, and the liquid content of the chitosan fibers is controlled. This allows the chitosan fibers entering the pre-opener to undergo preliminary loosening, improving the separation degree of the chitosan fibers and facilitating subsequent processing. Specifically, the composition of the pretreatment solution, which combines dispersant and penetrant, allows the refining and degreasing agent to penetrate into the interior of the chitosan fibers. This, combined with the subsequent pre-opening process, effectively removes impurities from the raw materials and improves the uniformity of the chitosan fibers, thereby improving the quality of the final product.

[0027] The specific operation of the carding process is as follows: Chitosan fibers are carded in a carding machine to form a fiber web. The carding machine has a cylinder needle height of 2.5 mm, a needle angle of 18°, a needle density of 550 teeth / inch, a main cylinder speed of 830 rpm, and a chest cylinder speed of 500 rpm.

[0028] When reinforcing the hydroentangled zone, the fiber web is reinforced using a rotary drum hydroentanglement system with 12 hydroentangle heads, a pore size of 0.12 mm, a density of 12 heads / cm, and a water pressure of 60 bar.

[0029] The specific operation of the hydrophilic softening finishing process is as follows: Chitosan fibers obtained by hydroentanglement are placed in a softening solution and first treated at a temperature of 30-40℃ for 10-20 minutes; then the temperature is raised to 50-60℃ and treated for 20-30 minutes, and the solution is drained; then the chitosan fiber cloth is washed in water at 35-45℃ for more than 15 minutes to complete the hydrophilic softening finishing of the chitosan fiber cloth; wherein, the softening solution includes 2-3 g / L of penetrant JFC and 15-18 g / L of hydrophilic silicone oil T718.

[0030] The specific operation of the finishing process is as follows: The hydrophilically treated fiber cloth is placed in the finishing solution in the finishing machine for finishing. The finishing temperature is 160-170℃ and the machine speed is 12-16m / min. The finishing solution contains 0.2-0.4% antistatic agent and 0.1-0.2% penetrant JFC.

[0031] The moisturizing layer is obtained by opening, mixing, carding, hydroentangling and finishing seaweed fiber and wood pulp fiber respectively. The weight ratio of seaweed fiber to wood pulp fiber is 1:0.25-0.35. The finishing process includes hydrophilic softening and shaping finishing, and the process flow is the same as that of the hydrophilic softening and shaping finishing in the first spunlace nonwoven fabric. The specific process flow of carding and hydroentangling is also the same as that of carding and hydroentangling in the first spunlace nonwoven fabric.

[0032] The preparation method of chitin fibers specifically includes the following steps:

[0033] Step 1: Add chitosan powder to an acid solution and soak for 8-12 hours; during the process, ultrasonically stir to obtain mixture a. Step 2: Filter mixture a to obtain mixture a, then add an alkaline solution to the acid-treated chitosan powder and soak for 4-6 hours; during the process, ultrasonically stir to obtain mixture b.

[0034] Step 3: Filter the mixture b to obtain mixture b. Then, mix mixture b, nanocellulose, and sodium lignosulfonate in a mass ratio of 10:2-4:6-8 until homogeneous. Add sodium hydroxide solution and mix until homogeneous. Then, perform degassing and washing treatments in sequence. Finally, perform spinning to obtain the chitin fiber. The amount of sodium hydroxide added is 3-4 times the mass of sodium lignosulfonate, and the mass fraction of sodium hydroxide is 30%.

[0035] In step 1, the ratio of chitin powder to acid solution is 1g:30-36mL; the acid solution is hydrochloric acid solution with a mass fraction of 15%; during the soaking treatment, the ultrasonic power density of ultrasonic stirring is 120-125W / L, and the ultrasonic frequency is 70-77KHz.

[0036] In step 2, the addition ratio of mixture a to alkaline solution is 1g:45-48mL; the alkaline solution is sodium hydroxide solution with a mass fraction of 25%; during the soaking treatment, the ultrasonic power density of ultrasonic stirring is 120-125W / L, and the ultrasonic frequency is 70-77KHz.

[0037] In step 3, the spinning operation adopts the traditional chemical fiber preparation process.

[0038] Example 1

[0039] A composite spunlace nonwoven wet wipe includes a first spunlace nonwoven fabric, a moisturizing layer, and a second spunlace nonwoven fabric arranged sequentially from top to bottom; wherein the first spunlace nonwoven fabric, the moisturizing layer, and the second spunlace nonwoven fabric are reinforced and composited together by spunlace method. During the spunlace reinforcement composite process, the number of spunlace heads is 15, the pore size of the spunlace plate is 0.12mm, the density is 15 spunlaces / cm, and the water pressure is 100bar.

[0040] The first and second spunlace nonwoven fabrics are obtained from chitin fibers through pre-opening, fine opening, carding, hydroentanglement reinforcement, hydrophilic softening finishing, and shaping finishing.

[0041] The specific operation of the hydrophilic softening finishing process is as follows: Chitosan fibers obtained by hydroentanglement are placed in a softening finishing solution and first finished at 30°C for 20 minutes; then the temperature is raised to 50°C and finished for 30 minutes, and the solution is drained; then the chitosan fiber cloth is washed in water at 35°C for more than 15 minutes to complete the hydrophilic softening finishing of the chitosan fiber cloth; wherein, the softening finishing solution includes 2 g / L of penetrant JFC and 18 g / L of hydrophilic silicone oil T718.

[0042] The specific operation of the finishing process is as follows: The hydrophilically treated fiber cloth is placed in the finishing solution in the finishing machine for finishing. The finishing temperature is 160℃ and the machine speed is 12m / min. The finishing solution contains 0.4% antistatic agent and 0.1% penetrant JFC.

[0043] The moisturizing layer is obtained by opening, mixing, combing, hydroentangling and finishing seaweed fiber and wood pulp fiber respectively, with the weight ratio of seaweed fiber to wood pulp fiber being 1:0.25.

[0044] The preparation method of chitin fibers specifically includes the following steps:

[0045] Step 1: Add chitosan powder to an acid solution and soak for 8 hours; during the process, ultrasonic stirring is performed to obtain mixture a; Step 2: Filter mixture a to obtain mixture a, then add an alkaline solution to the acid-treated chitosan powder and soak for 4 hours; during the process, ultrasonic stirring is performed to obtain mixture b.

[0046] Step 3: Filter the mixture b to obtain mixture b. Then, mix mixture b, nanocellulose, and sodium lignosulfonate in a mass ratio of 10:2:8. Add sodium hydroxide solution and mix well. Then, perform degassing and washing treatments in sequence. Finally, perform spinning to obtain the chitin fiber. The amount of sodium hydroxide added is 3 times the mass of sodium lignosulfonate, and the mass fraction of sodium hydroxide is 30%.

[0047] In step 1, the ratio of chitin powder to acid solution is 1g:30mL; the acid solution is hydrochloric acid solution with a mass fraction of 15%; during the soaking treatment, the ultrasonic power density of the ultrasonic stirring is 120W / L and the ultrasonic frequency is 70KHz.

[0048] In step 2, the addition ratio of mixture a to alkaline solution is 1g:48mL; the alkaline solution is sodium hydroxide solution with a mass fraction of 25%; during the soaking treatment, the ultrasonic power density of the ultrasonic stirring is 125W / L and the ultrasonic frequency is 77KHz.

[0049] Example 2

[0050] A composite spunlace nonwoven fabric wet wipe includes a first spunlace nonwoven fabric, a moisturizing layer, and a second spunlace nonwoven fabric arranged sequentially from top to bottom; wherein the first spunlace nonwoven fabric, the moisturizing layer, and the second spunlace nonwoven fabric are reinforced and composited together by spunlace method. During the spunlace reinforcement composite process, the number of spunlace heads is 18, the pore size of the spunlace plate is 0.15mm, the density is 18 spunlaces / cm, and the water pressure is 80bar.

[0051] The first and second spunlace nonwoven fabrics are obtained from chitin fibers through pre-opening, fine opening, carding, hydroentanglement reinforcement, hydrophilic softening finishing, and shaping finishing.

[0052] The specific operation of the hydrophilic softening finishing process is as follows: Chitosan fibers obtained by hydroentanglement are placed in a softening finishing solution and first finished at 40°C for 10 minutes; then the temperature is raised to 60°C and finished for 20 minutes, and the solution is drained; then the chitosan fiber cloth is washed in water at 45°C for more than 15 minutes to complete the hydrophilic softening finishing of the chitosan fiber cloth; wherein, the softening finishing solution includes 3g / L of penetrant JFC and 15g / L of hydrophilic silicone oil T718.

[0053] The specific operation of the finishing process is as follows: The hydrophilically treated fiber cloth is placed in the finishing solution in the finishing machine for finishing. The finishing temperature is 170℃ and the machine speed is 16m / min. The finishing solution contains 0.2% antistatic agent and 0.2% penetrant JFC.

[0054] The moisturizing layer is obtained by opening, mixing, combing, hydroentangling and finishing seaweed fiber and wood pulp fiber respectively, with the weight ratio of seaweed fiber to wood pulp fiber being 1:0.35.

[0055] The preparation method of chitin fibers specifically includes the following steps:

[0056] Step 1: Add chitosan powder to an acid solution and soak for 8 hours; during the process, ultrasonic stirring is performed to obtain mixture a; Step 2: Filter mixture a to obtain mixture a, then add an alkaline solution to the acid-treated chitosan powder and soak for 4 hours; during the process, ultrasonic stirring is performed to obtain mixture b.

[0057] Step 3: Filter the mixture b to obtain mixture b. Then, mix mixture b, nanocellulose, and sodium lignosulfonate in a mass ratio of 10:4:6 until homogeneous. Add sodium hydroxide solution and mix until homogeneous. Then, perform degassing and washing treatments in sequence. Finally, perform spinning to obtain the chitin fiber. The amount of sodium hydroxide added is 4 times the mass of sodium lignosulfonate, and the mass fraction of sodium hydroxide is 30%.

[0058] In step 1, the ratio of chitin powder to acid solution is 1g:36mL; the acid solution is hydrochloric acid solution with a mass fraction of 15%; during the soaking treatment, the ultrasonic power density of the ultrasonic stirring is 125W / L and the ultrasonic frequency is 77KHz.

[0059] In step 2, the addition ratio of mixture a to alkaline solution is 1g:45mL; the alkaline solution is sodium hydroxide solution with a mass fraction of 25%; during the soaking treatment, the ultrasonic power density of ultrasonic stirring is 120W / L and the ultrasonic frequency is 70KHz.

[0060] Example 3

[0061] A composite spunlace nonwoven wet wipe includes a first spunlace nonwoven fabric, a moisturizing layer, and a second spunlace nonwoven fabric arranged sequentially from top to bottom; wherein the first spunlace nonwoven fabric, the moisturizing layer, and the second spunlace nonwoven fabric are reinforced and composited together by spunlace method. During the spunlace reinforcement composite process, the number of spunlace heads is 16, the pore size of the spunlace plate is 0.13mm, the density is 16 spunlaces / cm, and the water pressure is 90bar.

[0062] The first and second spunlace nonwoven fabrics are obtained from chitin fibers through pre-opening, fine opening, carding, hydroentanglement reinforcement, hydrophilic softening finishing, and shaping finishing.

[0063] The specific operation of the hydrophilic softening finishing process is as follows: Chitosan fibers obtained by hydroentanglement are placed in a softening finishing solution and first finished at 35°C for 15 minutes; then the temperature is raised to 55°C and finished for 25 minutes, and the solution is drained; then the chitosan fiber cloth is washed in water at 40°C for more than 15 minutes to complete the hydrophilic softening finishing of the chitosan fiber cloth; wherein, the softening finishing solution includes 2.5 g / L of penetrant JFC and 16 g / L of hydrophilic silicone oil T718.

[0064] The specific operation of the finishing process is as follows: The hydrophilically treated fiber cloth is placed in the finishing solution in the finishing machine for finishing. The finishing temperature is 165℃ and the machine speed is 14m / min. The finishing solution contains 0.3% antistatic agent and 0.15% penetrant JFC.

[0065] The moisturizing layer is obtained by opening, mixing, combing, hydroentangling and finishing seaweed fiber and wood pulp fiber respectively, with the weight ratio of seaweed fiber to wood pulp fiber being 1:0.3.

[0066] The preparation method of chitin fibers specifically includes the following steps:

[0067] Step 1: Add chitosan powder to an acid solution and soak for 10 hours; during the process, ultrasonic stirring is performed to obtain mixture a; Step 2: Filter mixture a to obtain mixture a, then add an alkaline solution to the acid-treated chitosan powder and soak for 5 hours; during the process, ultrasonic stirring is performed to obtain mixture b.

[0068] Step 3: Filter the mixture b to obtain mixture b. Then, mix mixture b, nanocellulose, and sodium lignosulfonate in a mass ratio of 10:3:7 until homogeneous. Add sodium hydroxide solution and mix until homogeneous. Then, perform degassing and washing treatments in sequence. Finally, perform spinning to obtain the chitin fiber. The amount of sodium hydroxide added is 3.5 times the mass of sodium lignosulfonate, and the mass fraction of sodium hydroxide is 30%.

[0069] In step 1, the ratio of chitin powder to acid solution is 1g:33mL; the acid solution is hydrochloric acid solution with a mass fraction of 15%; during the soaking treatment, the ultrasonic power density of the ultrasonic stirring is 122W / L and the ultrasonic frequency is 75KHz.

[0070] In step 2, the addition ratio of mixture a to alkaline solution is 1g:46mL; the alkaline solution is sodium hydroxide solution with a mass fraction of 25%; during the soaking treatment, the ultrasonic power density of ultrasonic stirring is 122W / L and the ultrasonic frequency is 75KHz.

[0071] Comparative Example 1

[0072] Its raw material composition and preparation method are basically the same as those in Example 3. The difference is that the chitin fiber uses conventional chitin fiber, that is, it does not include the chitin fiber preparation method in Example 3.

[0073] The nonwoven wet wipes prepared in Examples 1-3 and Comparative Example 1 were subjected to corresponding performance tests. For example, the tensile strength was tested using a YG028-500 tensile tester in a wet state, referring to standard GB / T24218.3-2010 Textiles - Test Methods for Nonwoven Fabrics - Part 3: Determination of Tensile Strength and Elongation at Break. The sample size was 50mm*500mm, the clamping distance was 200mm, and the tensile speed was 100mm / min. The bending length was tested according to standard GB / T18318.1-2009 Textiles - Determination of Bending Properties. Bending length refers to the length of a rectangular fabric sample bent to 7.1° under its own weight, held at one end and suspended at the other. A smaller bending length indicates that it is easier to bend and deform under its own weight, meaning it is softer.

[0074] Table 1 Performance Test Data

[0075] project Transverse fracture strength / N Lateral bending length / cm Example 1 17.8 0.9 Example 2 18.1 1.0 Example 3 18.2 0.9 Comparative Example 1 11.6 1.8

[0076] As shown in the table above, the non-woven wet wipes prepared in this application have good softness and strength, meeting the usage requirements of wet wipes. Specifically, comparing Example 3 with Comparative Example 1, this application defines the preparation process of chitosan fibers. First, chitosan is acidified and alkalized, then mixed evenly with nanocellulose and sodium lignosulfonate to improve the strength of the prepared chitosan fibers. The addition of nanocellulose, combined with the treated chitosan, can compensate for the poor strength of existing chitosan fibers without affecting their biodegradability. The introduction of sodium lignosulfonate ensures uniform mixing of all substances, guaranteeing the performance of the prepared chitosan fibers.

[0077] The wet wipes prepared in this application are obtained by hydroentangling a first spunlace nonwoven fabric, a moisturizing layer, and a second spunlace nonwoven fabric. The first spunlace nonwoven fabric, the second spunlace nonwoven fabric, and the moisturizing layer are made of biodegradable chitin fiber, seaweed fiber, and wood pulp fiber, respectively. Chitin fiber, seaweed fiber, and wood pulp fiber are all biodegradable fibers, which enables the prepared nonwoven wet wipes to have a biodegradable effect and meet the requirements of environmental protection. Furthermore, the seaweed fiber and wood pulp fiber have good moisture absorption and moisturizing properties, which can improve the moisturizing effect of the moisturizing layer, thereby ensuring the moisture content of the nonwoven wet wipes and meeting the usage requirements of wet wipes.

[0078] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the specification of the present invention should still fall within the scope of the patent of the present invention.

Claims

1. A composite spunlace nonwoven fabric wet wipe, characterized in that: The material comprises, from top to bottom, a first spunlace nonwoven fabric, a moisturizing layer, and a second spunlace nonwoven fabric. The first spunlace nonwoven fabric, the moisturizing layer, and the second spunlace nonwoven fabric are reinforced and composited together by spunlace technology. The first spunlace nonwoven fabric and the second spunlace nonwoven fabric are obtained from chitin fibers through pre-opening, fine opening, carding, spunlace reinforcement, hydrophilic softening finishing, and shaping finishing. The moisturizing layer is obtained from seaweed fibers and wood pulp fibers through opening, mixing, carding, spunlace reinforcement, and finishing processes, respectively. The weight ratio of seaweed fibers to wood pulp fibers is 1:0.25-0.

35.

2. The composite spunlace nonwoven wet wipe according to claim 1, characterized in that: The preparation method of the chitin fiber specifically includes the following steps: Step 1: Add chitin powder to an acid solution and soak for 8-12 hours; during the process, ultrasonic stirring is performed simultaneously to obtain mixture a. Step 2: Filter the mixture a to obtain mixture a, then add an alkaline solution to the acid-treated chitin powder and soak it for 4-6 hours. During the process, ultrasonic stirring is performed to obtain mixture b. Step 3: Filter the mixture b to obtain mixture b. Then, mix mixture b, nanocellulose, and sodium lignosulfonate in a mass ratio of 10:2-4:6-8 until homogeneous. Add sodium hydroxide solution and mix until homogeneous. Then, perform degassing and washing treatments in sequence. Finally, perform spinning to obtain the chitin fiber. The amount of sodium hydroxide added is 3-4 times the mass of sodium lignosulfonate, and the mass fraction of sodium hydroxide is 30%.

3. The composite spunlace nonwoven wet wipe according to claim 2, characterized in that: In step 1, the ratio of chitin powder to acid solution is 1g: 30-36mL; in step 2, the ratio of mixture a to alkaline solution is 1g: 45-48mL.

4. The composite spunlace nonwoven wet wipe according to claim 2, characterized in that: The acid solution is a hydrochloric acid solution with a mass fraction of 15%; the alkaline solution is a sodium hydroxide solution with a mass fraction of 25%.

5. The composite spunlace nonwoven wet wipe according to claim 2, characterized in that: In steps 1 and 2, during the soaking treatment, the ultrasonic power density of the ultrasonic stirring is 120-125W / L, and the ultrasonic frequency is 70-77KHz.

6. The composite spunlace nonwoven wet wipe according to claim 2, characterized in that: In step 3, the spinning operation adopts the traditional chemical fiber preparation process.

7. The composite spunlace nonwoven wet wipe according to claim 1, characterized in that: When using hydroentanglement to reinforce composites, the number of hydroentanglement heads is 15-18, the pore size of the hydroentanglement plate is 0.12-0.15mm, the density is 15-18 heads / cm, and the water pressure is 80-100 bar.

8. The composite spunlace nonwoven wet wipe according to claim 1, characterized in that: The specific operation of the hydrophilic softening finishing process is as follows: Chitosan fibers obtained by hydroentanglement are placed in a softening finishing solution and first finished at a temperature of 30-40℃ for 10-20 minutes; then the temperature is raised to 50-60℃ and finished for 20-30 minutes, and the solution is drained; then the chitosan fiber cloth is washed in water at 35-45℃ for more than 15 minutes to complete the hydrophilic softening finishing of the chitosan fiber cloth.

9. A composite spunlace nonwoven wet wipe according to claim 7, characterized in that: The softening finishing solution includes 2-3 g / L of penetrant JFC and 15-18 g / L of hydrophilic silicone oil T718.

10. A composite spunlace nonwoven wet wipe according to claim 1, characterized in that: The specific operation of the finishing process is as follows: the hydrophilic treated fiber cloth is placed in the finishing solution in the finishing machine for finishing. The finishing temperature is 160-170℃ and the machine speed is 12-16m / min. The finishing solution contains 0.2-0.4% antistatic agent and 0.1-0.2% penetrant JFC.