Multifunctional Lyocell non-woven material and preparation method and application thereof

Abstract

The invention discloses a multifunctional Lyocell non-woven material as well as a preparation method and application thereof, and belongs to the technical field of Lyocell functional non-woven materials. The invention relates to a multifunctional Lyocell non-woven material, the multifunctional Lyocell non-woven material is obtained by uniformly mixing the following raw material solutions in parts by weight and then carrying out a dry spraying wet method, and the raw materials comprise 95-100 parts of Lyocell fibers and 0.01-5 parts of functional substances. According to the multifunctional Lyocell non-woven material provided by the invention, the renewable and biodegradable Lyocell fibers are adopted as a matrix, so that the problems of resource shortage, environmental pollution and the like in the prior art are solved.

Description

Technical Field

[0001] The invention relates to a multifunctional Lyocell nonwoven material and a preparation method and application thereof, belonging to the technical field of Lyocell functional nonwoven materials. Background Art

[0002] The entire process of Lyocell fiber production is a purely physical change. The spinning process is simple and convenient, green and environmentally friendly, the solvent is non-toxic and recyclable, and its strength and modulus are also higher than traditional viscose fibers. Lyocell fiber has the characteristics of soft touch, good hygroscopicity, small fiber diameter, and biodegradability. It can be directly spun into a web and reinforced by thermal bonding or hydroentanglement to obtain Lyocell fiber nonwoven materials. Lyocell fiber nonwoven materials can be used in battery separators, papermaking, filtration, automotive floor mats, seat covers, carpets, skin care products (nonwoven facial mask products), diapers, etc. The research and development of a variety of Lyocell fiber nonwoven products has become one of the important development trends.

[0003] At present, there is still a lack of research on Lyocell nonwoven materials. Chinese invention patent CN 108239822A discloses a method for preparing Lyocell filament nonwoven materials. The method stretches the Lyocell fibers obtained by solution spinning, separates the fibers by vibration, and forms a web to obtain a Lyocell filament web, which is then reinforced by hydroentanglement to obtain a Lyocell filament nonwoven material. The Lyocell nonwoven material obtained by this method has good mechanical properties, but its web structure does not change much and the obtained material does not have functionality, which makes it difficult to meet the current demand for functional materials. Based on the application requirements for functional materials, Lyocell fiber functionalization has been widely studied. At present, common Lyocell functionalizations include antibacterial, flame retardant, luminescent, fluorescent anti-counterfeiting, fibrillation, etc. However, there are still few studies on functionalized Lyocell nonwoven materials. Therefore, the market is in urgent need of multifunctional Lyocell nonwoven materials. Summary of the invention

[0004] The purpose of the present invention is to overcome the technical defects of the prior art, solve the above-mentioned technical problems, and propose a multifunctional Lyocell nonwoven material and a preparation method and application thereof.

[0005] The present invention specifically adopts the following technical scheme: a multifunctional Lyocell nonwoven material, which is obtained by uniformly mixing raw material solutions in the following weight proportions and then undergoing a dry-wet spray method, wherein the raw materials include: 95 to 100 parts of Lyocell fibers and 0.01 to 5 parts of functional substances.

[0006] As a preferred embodiment, the weight average molecular weight of the Lyocell fiber is 3.0×10 4 ~3.0×10 5 ; The functional substance is a natural polyphenol polymer, and the natural polyphenol polymer is any one of the following: naringenin, curcumin, and rutin.

[0007] The present invention also provides a method for preparing a multifunctional Lyocell nonwoven material, which is characterized by comprising the following steps:

[0008] Step S1: drying the Lyocell fiber and the functional substance in a vacuum oven;

[0009] Step S2: adding the dried functional substance to a 50% to 75% NMMO aqueous solution, and then ultrasonically treating the solution to obtain a functional NMMO aqueous solution;

[0010] Step S3: Add Lyocell fiber to the functional NMMO aqueous solution obtained in step S2 to obtain functional Lyocell spinning solution, and then obtain Lyocell fiber web by dry-wet spraying method, and then obtain multifunctional Lyocell nonwoven material by stacking and reinforcing different fiber webs.

[0011] As a preferred embodiment, the drying treatment conditions in step S1 are: temperature 50-105° C., time 8-48 hours.

[0012] As a preferred embodiment, the ultrasonic treatment time in step S2 is 3 to 15 minutes.

[0013] As a preferred embodiment, in the step S3, the spinning temperature is 80-120° C., the spinning speed is 20-80 mL / min, and the spinneret aperture is 0.05-0.15 mm / 100 holes.

[0014] As a preferred embodiment, the presence of local eddies in the dry-jet wet coagulation bath in step S3 can further stretch the fibers and make the fibers randomly distributed.

[0015] As a preferred embodiment, in the step S3, there is a mesh curtain in the dry-spray wet coagulation bath, and the mesh curtain speed is 0.5-10 m / min.

[0016] As a preferred embodiment, the nonwoven material in step S3 has different fiber diameters, fiber mesh pore sizes, porosities, and fiber mesh surface densities.

[0017] The present invention also proposes an application of the multifunctional Lyocell nonwoven material, characterized in that it is applied to antibacterial dust masks, antibacterial perspiration clothing and wound bandages.

[0018] The beneficial effects achieved by the present invention are as follows: (1) The preparation process of the multifunctional Lyocell nonwoven material provided by the present invention is simple, the cost is low, and the environmental pollution is small, which belongs to the category of clean production; (2) The multifunctional Lyocell nonwoven material provided by the present invention adopts renewable and biodegradable Lyocell fiber as the matrix, which solves the existing problems of resource shortage and environmental pollution; (3) The multifunctional Lyocell nonwoven material provided by the present invention uses a turbine and a mesh curtain device in the coagulation bath of Lyocell fiber prepared by the dry-wet spray method to directly A Lyocell fiber mesh structure is obtained, and then a multifunctional Lyocell nonwoven material is obtained by stacking and reinforcing different fiber meshes, so that the nonwoven material has a multi-level fiber mesh structure; (4) The functional substances (naringenin, curcumin, rutin) provided by the present invention have good antibacterial and antioxidant functions, and have different colors, so that the nonwoven material has multifunctionality and color appreciation; the multi-level nonwoven material obtained by eddy current drawing and stacking and reinforcement has a gradient porosity structure, so that it can block different particles and form a hydrophilic gradient between different levels, playing a moisture conduction role. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the principle of a method for preparing a multifunctional Lyocell nonwoven material of the present invention. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0023] Unless otherwise specified, the raw materials used in the examples were purchased commercially.

[0024] Example 1

[0025] like Figure 1As shown, the preparation method of the multifunctional Lyocell nonwoven material of this embodiment is as follows:

[0026] (1) First, a weight average molecular weight of 2.0×10 5 The Lyocell fibers and the natural polyphenol polymer rutin were dried in a vacuum oven at 85°C for 24 hours for later use;

[0027] (2) weighing raw materials according to a weight ratio of Lyocell fiber to rutin of 99.0:1.0, adding rutin to a 70% NMMO aqueous solution, and then ultrasonically treating to obtain a functional NMMO aqueous solution, the ultrasonic time being 5 min;

[0028] (3) Lyocell fiber is added to a functional NMMO aqueous solution to obtain a functional Lyocell spinning solution, and then a Lyocell fiber web is obtained by a dry-wet spray method, and then a multifunctional Lyocell nonwoven material is obtained by stacking and reinforcing different fiber webs; wherein the spinning temperature is 105°C, the spinneret aperture is 0.10 mm / 100 holes, the turbine speed is 1000 rpm, and the mesh curtain speed is 3 m / min.

[0029] Example 2

[0030] The preparation method of the multifunctional Lyocell nonwoven material of this embodiment is as follows:

[0031] (1) First, a weight average molecular weight of 2.0×10 5 The Lyocell fibers and the natural polyphenol polymer rutin were dried in a vacuum oven at 85°C for 24 hours for later use;

[0032] (2) weighing raw materials according to the weight ratio of Lyocell fiber to rutin of 98.0:2.0, adding rutin to 70% NMMO aqueous solution, and then ultrasonically treating to obtain a functional NMMO aqueous solution, the ultrasonic time is 5 minutes;

[0033] (3) Lyocell fiber is added to a functional NMMO aqueous solution to obtain a functional Lyocell spinning solution, and then a Lyocell fiber web is obtained by a dry-wet spray method, and then a multifunctional Lyocell nonwoven material is obtained by stacking and reinforcing different fiber webs; wherein the spinning temperature is 105°C, the spinneret aperture is 0.10 mm / 100 holes, the turbine speed is 1000 rpm, and the mesh curtain speed is 3 m / min.

[0034] Example 3

[0035] The preparation method of the multifunctional Lyocell nonwoven material of this embodiment is as follows:

[0036] (1) First, a weight average molecular weight of 2.0×10 5 The Lyocell fibers and the natural polyphenol polymer rutin were dried in a vacuum oven at 85°C for 24 hours for later use;

[0037] (2) weighing raw materials according to the weight ratio of Lyocell fiber to rutin of 97.0:3.0, adding rutin to 70% NMMO aqueous solution, and then ultrasonically treating to obtain a functional NMMO aqueous solution, the ultrasonic time is 5 minutes;

[0038] (3) Lyocell fiber is added to a functional NMMO aqueous solution to obtain a functional Lyocell spinning solution, and then a Lyocell fiber web is obtained by a dry-wet spray method, and then a multifunctional Lyocell nonwoven material is obtained by stacking and reinforcing different fiber webs; wherein the spinning temperature is 105°C, the spinneret aperture is 0.10 mm / 100 holes, the turbine speed is 1000 rpm, and the mesh curtain speed is 3 m / min.

[0039] Example 4

[0040] (1) First, a weight average molecular weight of 2.0×10 5 The Lyocell fibers and the natural polyphenol polymer rutin were dried in a vacuum oven at 85°C for 24 hours for later use;

[0041] (2) weighing raw materials according to a weight ratio of Lyocell fiber to rutin of 96.0:4.0, adding rutin to a 70% NMMO aqueous solution, and then ultrasonically treating to obtain a functional NMMO aqueous solution, the ultrasonic time being 5 min;

[0042] (3) Lyocell fiber is added to a functional NMMO aqueous solution to obtain a functional Lyocell spinning solution, and then a Lyocell fiber web is obtained by a dry-wet spray method, and then a multifunctional Lyocell nonwoven material is obtained by stacking and reinforcing different fiber webs; wherein the spinning temperature is 105°C, the spinneret aperture is 0.10 mm / 100 holes, the turbine speed is 1000 rpm, and the mesh curtain speed is 3 m / min.

[0043] Example 5

[0044] The preparation method of the multifunctional Lyocell nonwoven material of this embodiment is as follows:

[0045] (1) First, a weight average molecular weight of 2.0×10 5 The Lyocell fibers and the natural polyphenol polymer rutin were dried in a vacuum oven at 85°C for 24 hours for later use;

[0046] (2) weighing raw materials according to a weight ratio of Lyocell fiber to rutin of 96.0:4.0, adding rutin to a 70% NMMO aqueous solution, and then ultrasonically treating to obtain a functional NMMO aqueous solution, the ultrasonic time being 5 min;

[0047] (3) Lyocell fiber is added to a functional NMMO aqueous solution to obtain a functional Lyocell spinning solution, and then a Lyocell fiber web is obtained by a dry-wet spray method, and then a multifunctional Lyocell nonwoven material is obtained by stacking and reinforcing different fiber webs; wherein the spinning temperature is 105°C, the spinneret aperture is 0.10 mm / 100 holes, the turbine speed is 2000 rpm, and the mesh curtain speed is 3 m / min.

[0048] Comparative Example 1

[0049] (1) First, a weight average molecular weight of 2.0×10 5 The Lyocell fibers and the natural polyphenol polymer rutin were dried in a vacuum oven at 85°C for 24 hours for later use;

[0050] (2) Lyocell fiber is added to a 70% NMMO aqueous solution to obtain a Lyocell spinning solution, and then a Lyocell fiber web is obtained by a dry-wet spray method, and then a Lyocell nonwoven material is obtained by stacking and reinforcing different fiber webs; wherein the spinning temperature is 105°C, the spinneret aperture is 0.10 mm / 100 holes, the turbine speed is 1000 rpm, and the mesh curtain speed is 3 m / min.

[0051] Comparative Example 2

[0052] (1) First, a weight average molecular weight of 2.0×10 5 The Lyocell fibers and the natural polyphenol polymer rutin were dried in a vacuum oven at 85°C for 24 hours for later use;

[0053] (2) weighing raw materials according to the weight ratio of Lyocell fiber to rutin of 98.8:1.2, adding rutin to 70% NMMO aqueous solution, and then ultrasonically treating to obtain a functional NMMO aqueous solution, the ultrasonic time is 5 minutes;

[0054] (3) Lyocell fiber is added to a functional NMMO aqueous solution to obtain a functional Lyocell spinning solution, and then a Lyocell fiber web is obtained by a dry-wet spray method, and then a multifunctional Lyocell nonwoven material is obtained by stacking and reinforcing different fiber webs; wherein the spinning temperature is 105°C, the spinneret aperture is 0.10 mm / 100 holes, the turbine speed is 0 rpm, and the mesh curtain speed is 3 m / min.

[0055] Effect Example 1

[0056] The antibacterial and antioxidant properties and pore size distribution of the Lyocell nonwoven materials obtained in the above Examples 1 to 5 and Comparative Examples 1 to 2 were characterized and tested, and the test method was as follows:

[0057] Test method for antibacterial properties: The antibacterial properties of Lyocell nonwoven materials were tested in accordance with the national standard "GB / T20944.2-2007 Evaluation of antibacterial properties of textiles Part 2: Absorption method", and the results were expressed in terms of Staphylococcus aureus inhibition rate and Escherichia coli inhibition rate.

[0058] Antioxidant performance test method: Antioxidant performance is evaluated by measuring the ABTS.+ free radical scavenging rate on a UV-visible spectrophotometer. 10 mg of sample is added to 10 mL of prepared ABTS.+ solution (absorbance at 734 nm: 0.700 ± 0.025), and the absorbance at 734 nm is measured after being placed at room temperature for 30 minutes. The scavenging rate of the sample on ABTS.+ free radicals is calculated by the following formula. Where A ctrl represents the initial absorbance of ABTS.+ solution, A spl Represents the absorbance of ABTS.+ solution 30 minutes after adding to the sample. The antioxidant performance experiment of each sample was repeated three times and the results were averaged.

[0059] Antioxidant (%) = 100 × (A ctrl -A spl ) / A spl

[0060] Pore ​​size distribution test method: Use CFP-1100A pore size meter to measure the pore size and distribution of Lyocell nonwoven materials.

[0061] The specific test results are shown in Table 1 below:

[0062] Table 1 Test results of antibacterial, antioxidant and pore size distribution properties of various multifunctional Lyocell nonwoven materials

[0063]

[0064] It can be seen from Table 1 above:

[0065] (1) Compared with the control example 1, the Lyocell nonwoven materials without the addition of the natural polyphenol polymer rutin in Examples 1-5 have no antibacterial and antioxidant properties, while the Lyocell nonwoven materials with the addition of the natural polyphenol polymer rutin have significant antibacterial and antioxidant effects.

[0066] (2) Compared with the control example 2, the fiber diameter of the Lyocell nonwoven material after vortex drawing in the embodiment 1 is reduced, the pore size of the nonwoven material is reduced, and the porosity is increased, which also promotes its functionality.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A multifunctional Lyocell nonwoven material, characterized in that: The multifunctional Lyocell nonwoven material is obtained by uniformly mixing the following raw material solutions in parts by weight and then using a dry-wet spray method, wherein the raw materials include: 95-100 parts of Lyocell fibers and 0.01-5 parts of functional substances.

2. A multifunctional Lyocell nonwoven material according to claim 1, characterized in that: The weight average molecular weight of the Lyocell fiber is 3.0×10 4 ~3.0×10 5 ; The functional substance is a natural polyphenol polymer, and the natural polyphenol polymer is any one of the following: naringenin, curcumin, and rutin.

3. A method for preparing the multifunctional Lyocell nonwoven material according to claim 1, characterized in that: The following steps are involved: Step S1: drying the Lyocell fiber and the functional substance in a vacuum oven; Step S2: adding the dried functional substance to a 50% to 75% NMMO aqueous solution, and then ultrasonically treating the solution to obtain a functional NMMO aqueous solution; Step S3: Add Lyocell fiber to the functional NMMO aqueous solution obtained in step S2 to obtain functional Lyocell spinning solution, and then obtain Lyocell fiber web by dry-wet spraying method, and then obtain multifunctional Lyocell nonwoven material by stacking and reinforcing different fiber webs.

4. The method for preparing a multifunctional Lyocell nonwoven material according to claim 3, characterized in that: The drying conditions in step S1 are: temperature 50-105° C., time 8-48 hours.

5. The method for preparing a multifunctional Lyocell nonwoven material according to claim 3, characterized in that: The ultrasonic treatment time in step S2 is 3 to 15 minutes.

6. The method for preparing a multifunctional Lyocell nonwoven material according to claim 3, characterized in that: In the step S3, the spinning temperature is 80-120° C., the spinning speed is 20-80 mL / min, and the spinneret aperture is 0.05-0.15 mm / 100 holes.

7. The method for preparing a multifunctional Lyocell nonwoven material according to claim 3, characterized in that: The local eddy currents in the dry-jet wet coagulation bath in step S3 can further stretch the fibers and make the fibers randomly distributed.

8. The method for preparing a multifunctional Lyocell nonwoven material according to claim 3, characterized in that: In the step S3, there is a mesh curtain in the dry-spray wet coagulation bath, and the mesh curtain speed is 0.5-10 m / min.

9. The method for preparing a multifunctional Lyocell nonwoven material according to claim 3, characterized in that: The nonwoven material in step S3 has different fiber diameters, fiber mesh pore sizes, porosities, and fiber mesh surface densities.

10. An application of the multifunctional Lyocell nonwoven material according to claim 1, characterized in that: Used in antibacterial dust masks, antibacterial perspiration clothing and wound bandages.

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