Preparation method and application of one-way moisture-conducting non-woven fabric

Abstract

The invention discloses a preparation method and application of a one-way moisture-conducting non-woven fabric, the one-way moisture-conducting non-woven fabric is prepared by hot-pressing and compounding a hydrophilic layer and a hydrophobic layer, the hydrophilic layer non-woven fabric is prepared by the processes of bi-component melt spinning, washing, drying and the like, and the hydrophobic layer non-woven fabric is prepared by direct melt spinning. Through melt spinning and hot-pressing composite molding methods, the fabric with excellent one-way moisture conduction performance is obtained, the non-fabric hydrophilic layer and the non-fabric hydrophobic layer are compounded together, the hydrophilic performance of the non-fabric hydrophilic layer is better, a wettability gradient is formed between the hydrophilic layer and the hydrophobic layer, and the wettability of the non-fabric hydrophilic layer is improved. The one-way moisture conduction capability of the fabric can be further improved. According to the preparation process, the hydrophilic modification process of the polyester fiber material is avoided, the influence of hydrophilic treatment and other modes on the comprehensive performance and the processability of the fiber is avoided, short-process processing can be achieved, and no special requirement for existing processing equipment exists.

Description

Technical Field

[0001] The invention belongs to the field of melt spinning preparation technology and nonwoven materials, and particularly relates to a preparation method and application of a unidirectional moisture-conducting nonwoven fabric. Background Art

[0002] Polyester is a synthetic fiber with large usage and wide application fields, but polyester fiber has low moisture regain and poor hydrophilicity, which limits the application of fiber in textile clothing, national defense and military industries. Researchers have been committed to improving the hydrophilicity of polyester fibers and their fabrics. Currently known methods include copolymerization modification, co-spinning, profiled fiber structure, hydrophilic finishing agent finishing, surface hydrolysis, chemical grafting, etc., which can effectively enhance the hydrophilicity of polyester fibers. The existing hydrophilic modification methods can not only change the surface morphology and chemical structure of the fiber, but also give polyester fibers and their fabrics easy dyeing, antistatic and other properties. (Zhao Xiaoman, et al. Research progress and development direction of hydrophilic modification of polyester fibers. Journal of Clothing Research 2024, 9:189-197.) The hydrophilic modification of polyester fiber plays a positive role in improving the hydrophilic effect of polyester fiber, but there are also many problems: for example, the hydrophilic groups introduced in the copolymerization modification will cause the loss of polyester strength and the cost is high; the spinnability of the fiber needs to be paid attention to in the blending spinning, and the process of heterogeneous cross-section fiber has high requirements for spinning equipment; the post-finishing process such as hydrophilic finishing is simple, but the hand feeling of fabrics and other products is affected, and the alkali reduction treatment has a good modification effect, but it seriously damages the fiber strength. The chemical grafting method has a poor hydrophilic effect and high cost due to the limited number of hydroxyl groups on the fiber surface.

[0003] In order to realize the hydrophilic effect of polyester fiber and its fabric, the present invention proposes a short process, melt direct spinning and composite forming technology to directly prepare the non-woven hydrophilic layer and the hydrophobic layer, thereby realizing the unidirectional moisture conduction function of the non-woven fabric. The present invention overcomes the many requirements on process, equipment and cost generated by the existing hydrophilic modification methods of polyester fiber materials. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a unidirectional moisture-conducting nonwoven fabric, which can achieve super-hydrophilic properties of polyester fibers. When the nonwoven fabric prepared by melt spinning achieves the hydrophilic properties of the nonwoven fabric, the polyvinyl alcohol in the nonwoven fabric fibers is washed away, and the lost polyvinyl alcohol can be recycled. The preparation process of the present invention avoids the influence of hydrophilic finishing and other methods on the comprehensive properties and processing costs of the fibers, and the obtained polyester fibers have stable properties, which is convenient for expanding its application field.

[0005] To this end, the present invention provides a method for preparing a unidirectional moisture-conducting nonwoven fabric, comprising: (1) using a polyester polymer and a polymer modification additive as a first component and a polyvinyl alcohol polymer as a second component, performing bicomponent melt spinning, drawing, laying, and thermal bonding to form a first nonwoven fabric; (2) washing the first nonwoven fabric with water to dissolve the polyvinyl alcohol component in the fibers, thereby obtaining a second nonwoven fabric having melt-spun fibers with a special cross-section; (3) Drying the second nonwoven fabric to obtain a nonwoven hydrophilic layer having a gram weight of 15-80 g / m 2 ; (4) Melt-spinning, drawing, web laying, and thermal bonding of polyester polymers and polymer-modified additives to prepare a non-woven hydrophobic layer having a gram weight of 10-50 g / m 2 ; (5) The non-woven hydrophilic layer and the non-woven hydrophobic layer are hot-pressed at a temperature of 100-150° C. to prepare a unidirectional moisture-conducting non-woven fabric.

[0006] Preferably, in step (1), the polyester polymer includes at least one of polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and polylactic acid; and in the first component, the polymer modification additive is zirconium dioxide, and its mass fraction is ≤10%.

[0007] Preferably, in step (1), the molecular weight of the polyvinyl alcohol polymer is ≤150,000.

[0008] Preferably, in step (1), the mass ratio of the polyester polymer to the polyvinyl alcohol polymer is 70:30-50:50.

[0009] Preferably, in steps (1) and (4), the melt spinning conditions are: the melt spinning processing temperature is 200-270° C., and the drawing method is hot air drawing.

[0010] Preferably, in step (3), the water contact angle of the non-woven hydrophilic layer is ≤50°.

[0011] Preferably, in step (4), the polymer modification additive is zirconium dioxide, and its mass fraction is ≤10%.

[0012] Preferably, in step (4), the water contact angle of the non-woven hydrophobic layer is ≥ 100°.

[0013] Preferably, in step (5), the unidirectional moisture-conducting nonwoven fabric has a gram weight of ≤200 g / m 2 .

[0014] The present invention also provides the application of the unidirectional moisture-conducting nonwoven fabric in the fields of textile sports fabrics, sanitary materials, packaging materials, fresh-keeping materials, biomedical materials, etc.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are: The present invention obtains a fabric with excellent unidirectional moisture conduction performance through the method of melt spinning and hot pressing composite molding. The non-woven hydrophilic layer and the non-woven hydrophobic layer are composited together, and the hydrophilic performance of the non-woven hydrophilic layer is better, so that a wettability gradient is formed between the hydrophilic layer and the hydrophobic layer, which can further improve the unidirectional moisture conduction ability of the fabric. In addition, the preparation process of the present application does not have a hydrophilic modification process of polyester fiber materials, avoids the influence of hydrophilic treatment and other methods on the comprehensive performance and processing performance of the fiber, can achieve short-process processing, and has no special requirements for existing processing equipment. The present invention realizes the direct preparation of non-woven fabrics by short-process, melt direct spinning and composite molding technology, realizes the unidirectional moisture conduction function of non-woven fabrics, and overcomes the requirements of existing polyester fiber material hydrophilic modification methods on process, equipment and cost. The fabric obtained by the present invention has stable performance and can expand its application field.

[0016] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a fiber morphology diagram of the non-woven hydrophilic layer of Example 1; Figure 2 This is a contact angle test diagram of the non-woven hydrophilic layer of Example 1; Figure 3 This is a contact angle test diagram of the non-woven hydrophobic layer of Example 1; Figure 4 The unidirectional moisture conduction test data of the unidirectional moisture conduction nonwoven fabric of Example 1; Figure 5 This is a contact angle test diagram of the non-woven hydrophilic layer in Comparative Example 1; Figure 6 This is the unidirectional moisture conduction test data of the nonwoven fabric in Comparative Example 1. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with specific embodiments. These embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. Meanwhile, after reading the present invention, those skilled in the art may make various modifications or changes to the present invention, and these equivalent forms also fall within the scope limited by the appended claims of the application.

[0019] The present invention provides a method for preparing a unidirectional moisture-conducting nonwoven fabric, comprising: (1) Using polyester polymer and polymer modification additive as the first component and polyvinyl alcohol polymer as the second component, two-component melt spinning is performed, and then the first nonwoven fabric is made by drawing, laying and thermal bonding. The melt spinning conditions are: melt spinning processing temperature is 200-270°C, and the drawing method is hot air drawing.

[0020] The polyester polymer includes one of polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and polylactic acid.

[0021] Since the melt spinning temperature of polyvinyl alcohol is lower than that of polyester polymers, limiting the molecular weight of polyvinyl alcohol polymer to ≤150,000 can achieve the synergy of melt spinning of polyvinyl alcohol and spinning of polyester polymers. In addition, since the polyvinyl alcohol in the fiber needs to be dissolved after fiber formation, if the molecular weight of polyvinyl alcohol is too large, it will seriously affect the dissolution rate of polyvinyl alcohol; limiting the molecular weight of polyvinyl alcohol polymer to ≤150,000 can facilitate the rapid dissolution of polyvinyl alcohol.

[0022] The mass ratio of the polyester polymer to the polyvinyl alcohol polymer in the two-component melt-spun fiber is 70:30-50:50. On the one hand, it can be beneficial to achieve the synergy between the melt spinning of polyvinyl alcohol and the spinning of the polyester polymer, and to achieve the fiber-forming property of the two-component fiber; on the other hand, after the polyvinyl alcohol is dissolved, it is beneficial to achieve a "U"-shaped structural cross-section of the non-woven fabric, and improve the material's ability to absorb and conduct moisture to water.

[0023] (2) The first nonwoven fabric is subjected to a water washing process, and the water washing temperature is controlled at 75-100° C., so that the polyvinyl alcohol component in the fiber is dissolved, and a second nonwoven fabric having melt-spun special-shaped cross-section fibers is obtained.

[0024] Since the polyvinyl alcohol component in the nonwoven fabric is water-soluble, controlling the washing temperature to 75-100°C can effectively promote the rapid dissolution of polyvinyl alcohol; at the same time, controlling the washing temperature to 75-100°C will not affect the performance of polyester polymers.

[0025] (3) Drying the second nonwoven fabric to obtain a nonwoven hydrophilic layer, wherein the nonwoven hydrophilic layer has a water contact angle of ≤50° and a gram weight of 15-80 g / m 2 ， It is helpful to obtain a hydrophilic layer with suitable porosity, pore size and thickness, and is helpful to further improve the unidirectional moisture conduction capacity of the fabric.

[0026] (4) Melt-spinning, drawing, web laying, and thermal bonding of the polyester modified polymer and the polymer modified additive to prepare a non-woven hydrophobic layer, wherein the non-woven hydrophobic layer has a water contact angle of ≥100° and a gram weight of 10-50 g / m 2, which is conducive to obtaining a hydrophobic layer with appropriate porosity, pore size and thickness, and is conducive to further improving the unidirectional moisture conduction capacity of the fabric.

[0027] The melt spinning conditions are as follows: the melt spinning processing temperature is 200-270° C., and the drawing method is hot air drawing.

[0028] The polymer modification additive is zirconium dioxide, and the added mass fraction is ≤10%. The effects of adding zirconium dioxide to polyethylene terephthalate modified masterbatch include: ① Zirconium dioxide has stable performance. As a polymer modifier, it can improve the temperature resistance of the polymer during melt spinning, expand the spinning temperature range, ensure the continuity of melt spinning, and enhance the spinnability and comprehensive performance of the polymer material; ② Doping zirconium dioxide in the polymer material can improve the solar reflectivity and atmospheric emissivity of the material, and realize the automatic cooling function of the material.

[0029] (5) The non-woven hydrophilic layer and the non-woven hydrophobic layer are hot-pressed at a temperature of 100-150° C. to prepare a unidirectional moisture-conducting non-woven fabric.

[0030] Unidirectional moisture-conducting nonwoven fabric weight ≤ 200 g / m 2 , which is beneficial to further improve the unidirectional moisture conduction capacity of the fabric.

[0031] The hot pressing temperature is set at 100-150°C, which will not damage the internal structure of the nonwoven fabric and is conducive to the rapid hot pressing forming of the unidirectional moisture-conducting nonwoven fabric.

[0032] The unidirectional moisture-conducting nonwoven fabric of the present invention has excellent unidirectional moisture-conducting performance and can be applied to the fields of textile sports fabrics, sanitary materials, packaging materials, fresh-keeping materials, biomedical materials, etc. Example

[0033] The preparation method of the unidirectional moisture-conducting nonwoven fabric of this embodiment comprises: (1) Polyethylene terephthalate is used as the first component and polyvinyl alcohol (molecular weight 60,000) is used as the second component. The first component and the second component polymer masterbatches are respectively poured into two hoppers of the two-component melt spinning equipment system. The first component polymer and the second component polymer are subjected to parallel two-component melt spinning, hot air drawing, web laying and thermal bonding to form a parallel two-component fiber nonwoven fabric (first nonwoven fabric). The mass ratio of the first component and the second component polymer is controlled by a metering pump to be 50:50 during the melt spinning process. The processing temperature of each zone of the first component is 230-270°C, and the processing temperature of each zone of the second component is 200-240°C.

[0034] (2) The parallel bicomponent fiber nonwoven fabric is subjected to a water washing process at a water washing temperature of 95°C to dissolve the polyvinyl alcohol component in the fiber, thereby obtaining a nonwoven fabric having melt-spun fibers with a special cross-section (the second nonwoven fabric) having a gram weight of 65 g / m 2 .

[0035] Figure 1 The fiber morphology of the nonwoven fabric shows that the polyvinyl alcohol component in the fiber dissolves and presents a non-circular structure.

[0036] (3) After washing, the nonwoven fabric enters the drying process to obtain a nonwoven fabric layer (nonwoven hydrophilic layer). The contact angle of the nonwoven fabric layer is measured to be 0° ( Figure 2 ), indicating that the nonwoven fabric layer has hydrophilicity.

[0037] (4) Polyethylene terephthalate is melt-spun at a spinning temperature of 230-270°C in each spinning zone, and then stretched, laid, and thermally bonded to prepare a nonwoven fabric layer (nonwoven hydrophobic layer) having a gram weight of 35 g / m 2 The contact angle of the nonwoven fabric layer was measured to be 152° ( Figure 3 ), indicating that the nonwoven fabric layer is hydrophobic.

[0038] (5) The non-woven hydrophilic layer and the non-woven hydrophobic layer are hot-pressed at a temperature of 130°C to prepare a unidirectional moisture-conducting non-woven fabric having a gram weight of 100 g / m 2 .

[0039] Figure 4 is the unilateral moisture conduction test data of the unilateral moisture conduction nonwoven fabric of Example 1, Figure 4 It can be seen that Example 1 The one-way moisture conduction nonwoven fabric has excellent one-way moisture conduction performance.

[0040] Based on the above preparation process, the non-woven hydrophilic layer prepared by parallel bicomponent melt spinning, based on the dissolution of the polyvinyl alcohol component in the parallel bicomponent fiber, makes the fiber in the non-woven fabric present a special-shaped cross-section (a "U"-shaped structural cross-section), that is, the fiber presents a non-circular structure; the non-circular structure of this fiber can form a uniform thin liquid film on its surface, thereby realizing the rapid diffusion of water, making the non-woven fabric present hydrophilic properties. At the same time, in the parallel bicomponent melt-spun fiber, the polymer interface of the first component and the second component will produce a polyethylene terephthalate and polyvinyl alcohol blend interface. With the help of the abundant hydroxyl groups of polyvinyl alcohol remaining on the fiber surface, the hydrophilic properties of the non-woven hydrophilic layer can be further improved. Then, the non-woven hydrophilic layer and the non-woven hydrophobic layer are compounded to prepare a unidirectional moisture-conducting non-woven fabric. Example

[0041] The preparation method of the unidirectional moisture-conducting nonwoven fabric of this embodiment comprises: (1) Polyethylene terephthalate modified masterbatch (containing 1.0% zirconium dioxide) is used as the first component, and polyvinyl alcohol (molecular weight 60,000) is used as the second component. The first component and the second component polymer masterbatch are respectively poured into two hoppers of a two-component melt spinning equipment system. The first component polymer and the second component polymer are subjected to parallel two-component melt spinning, hot air drawing, web laying, and thermal bonding to form a parallel two-component fiber nonwoven fabric (first nonwoven fabric). The mass ratio of the first component and the second component polymer is controlled by a metering pump to be 50:50 during the melt spinning process. The processing temperature of each zone of the first component is 230-270°C, and the processing temperature of each zone of the second component is 200-240°C.

[0042] (2) The parallel bicomponent fiber nonwoven fabric is subjected to a water washing process at a water washing temperature of 85°C, and the polyvinyl alcohol component in the fiber is dissolved to obtain a nonwoven fabric having melt-spun special-shaped cross-section fibers (the second nonwoven fabric) with a gram weight of 70 g / m 2 .

[0043] (3) After washing, the nonwoven fabric enters a drying process to obtain a nonwoven fabric layer (nonwoven hydrophilic layer). The contact angle of the nonwoven fabric layer is measured to be 0°, indicating that the nonwoven fabric layer is hydrophilic.

[0044] (4) Using polyethylene terephthalate modified masterbatch (containing 1.0% zirconium dioxide) for melt direct spinning, the processing temperature in each spinning zone is 230-270°C, and drafting, laying, and thermal bonding are performed to prepare a non-woven fabric layer (non-woven hydrophobic layer) with a gram weight of 40 g / m 2 The contact angle of the nonwoven fabric layer was measured to be 152°, indicating that the nonwoven fabric layer was hydrophobic.

[0045] (5) The non-woven hydrophilic layer and the non-woven hydrophobic layer are compounded and hot-pressed at a temperature of 130°C to prepare a unidirectional moisture-conducting non-woven fabric having a gram weight of 110 g / m 2 . Example

[0046] The preparation method of the unidirectional moisture-conducting nonwoven fabric of this embodiment comprises: (1) Polylactic acid is used as the first component and polyvinyl alcohol (molecular weight 80,000) is used as the second component. The first component and the second component polymer masterbatch are respectively poured into two hoppers of the two-component melt spinning equipment system. The first component polymer and the second component polymer are melt-spun in parallel, and hot air drawing, web laying and thermal bonding are performed to form a non-woven fabric (the first non-woven fabric). The mass ratio of the first component and the second component polymer is controlled by a metering pump to be 70:30 during the melt spinning process. The processing temperature of each zone of the first component is 200-240°C, and the processing temperature of each zone of the second component is 200-240°C.

[0047] (2) The parallel bicomponent fiber nonwoven fabric is subjected to a water washing process at a water washing temperature of 85°C, and the polyvinyl alcohol component in the fiber is dissolved to obtain a nonwoven fabric having melt-spun special-shaped cross-section fibers (the second nonwoven fabric) with a gram weight of 70 g / m 2 .

[0048] (3) After washing, the nonwoven fabric enters a drying process to obtain a nonwoven fabric layer (nonwoven hydrophilic layer). The contact angle of the nonwoven fabric layer is measured to be 0°, indicating that the nonwoven fabric layer is hydrophilic.

[0049] (4) Melt direct spinning of polylactic acid at a spinning temperature of 200-240°C in each spinning zone, drawing, laying, and thermal bonding to prepare a nonwoven fabric layer (nonwoven hydrophobic layer) with a gram weight of 40 g / m 2 The contact angle of the nonwoven fabric layer was measured to be 130°, indicating that the nonwoven fabric layer was hydrophobic.

[0050] (5) The non-woven hydrophilic layer and the non-woven hydrophobic layer are compounded and hot-pressed at a temperature of 135°C to prepare a unidirectional moisture-conducting non-woven fabric having a gram weight of 110 g / m 2 .

[0051] Comparative Example 1 The preparation method of the unidirectional moisture-conducting nonwoven fabric of this comparative example comprises: (1) Using polyethylene terephthalate modified masterbatch (containing 1.0% zirconium dioxide) as the first component and polyethylene terephthalate masterbatch as the second component, the first component and second component polymer masterbatch are respectively poured into two hoppers of a two-component melt spinning equipment system. The first component polymer and the second component polymer are subjected to parallel two-component melt spinning, hot air drawing, web laying, and thermal bonding to form a parallel two-component fiber nonwoven fabric. The mass ratio of the first component and the second component polymer is controlled by a metering pump to be 90:10 during the melt spinning process, the processing temperature of each zone of the first component is 230-270°C, and the processing temperature of each zone of the second component is 230-270°C.

[0052] (2) The parallel bicomponent fiber nonwoven fabric was subjected to a water washing process at a water washing temperature of 95°C. No component was dissolved in the fiber to obtain a melt-spun nonwoven fabric with a gram weight of 65 g / m 2 .

[0053] (3) After washing, the nonwoven fabric is surface treated with dopamine and enters the drying process to obtain a nonwoven hydrophilic layer. The contact angle of the nonwoven fabric layer is between 50° and 90° ( Figure 5 ), indicating that the nonwoven fabric layer has hydrophilicity.

[0054] (4) Using polyethylene terephthalate modified masterbatch (containing 1.0% zirconium dioxide) for melt direct spinning, the processing temperature in each spinning zone is 230-270°C, and the non-woven fabric layer is prepared by drawing, laying and thermal bonding, and the gram weight is 35 g / m 2 The contact angle of the nonwoven fabric layer was measured to be 152°, indicating that the nonwoven fabric layer was hydrophobic.

[0055] (5) The two layers of nonwoven fabric are laminated at a heat pressing temperature of 130°C and a weight of 100 g / m 2 . Figure 6 for The unidirectional moisture conduction test data of the nonwoven fabric in Comparative Example 1 is obtained by Figure 4 and Figure 6 By comparison, it can be seen that the nonwoven fabric of Comparative Example 1 has no obvious unidirectional moisture conduction ability.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A method for preparing a unidirectional moisture-conducting nonwoven fabric, characterized in that: include: (1) using a polyester polymer and a polymer modification additive as a first component and a polyvinyl alcohol polymer as a second component, performing bicomponent melt spinning, drawing, laying, and thermal bonding to form a first nonwoven fabric; (2) washing the first nonwoven fabric with water to dissolve the polyvinyl alcohol component in the fibers, thereby obtaining a second nonwoven fabric having melt-spun fibers with a special cross-section; (3) Drying the second nonwoven fabric to obtain a nonwoven hydrophilic layer having a gram weight of 15-80 g / m 2 ; (4) Melt-spinning, drawing, web laying, and thermal bonding of polyester polymers and polymer-modified additives to prepare a non-woven hydrophobic layer having a gram weight of 10-50 g / m 2 ; (5) The non-woven hydrophilic layer and the non-woven hydrophobic layer are hot-pressed to prepare a unidirectional moisture-conducting non-woven fabric.

2. The method for preparing a unidirectional moisture-conducting nonwoven fabric according to claim 1, characterized in that: In step (1), the polyester polymer includes at least one of polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and polylactic acid; In the first component, the polymer modification additive is zirconium dioxide, and its mass fraction is ≤10%.

3. The method for preparing a unidirectional moisture-conducting nonwoven fabric according to claim 1, characterized in that: In the step (1), the molecular weight of the polyvinyl alcohol polymer is ≤150,000.

4. The method for preparing a unidirectional moisture-conducting nonwoven fabric according to claim 1, characterized in that: In the step (1), the mass ratio of the polyester polymer to the polyvinyl alcohol polymer is 70:30-50:

50.

5. The method for preparing a unidirectional moisture-conducting nonwoven fabric according to claim 1, characterized in that: In the steps (1) and (4), the melt spinning conditions are as follows: the melt spinning processing temperature is 200-270° C., and the drawing method is hot air drawing.

6. The method for preparing a unidirectional moisture-conducting nonwoven fabric according to claim 1, characterized in that: In the step (3), the water contact angle of the non-woven hydrophilic layer is ≤50°.

7. The method for preparing a unidirectional moisture-conducting nonwoven fabric according to claim 1, characterized in that: In the step (4), the polymer modification additive is zirconium dioxide, and its mass fraction is ≤10%.

8. The method for preparing a unidirectional moisture-conducting nonwoven fabric according to claim 1, characterized in that: In the step (4), the water contact angle of the non-woven hydrophobic layer is ≥100°.

9. The method for preparing a unidirectional moisture-conducting nonwoven fabric according to claim 1, characterized in that: In the step (5), the hot pressing temperature is 100-150°C, and the weight of the unidirectional moisture-conducting nonwoven fabric is ≤200 g / m 2 .

10. The unidirectional moisture-conducting nonwoven fabric according to any one of claims 1 to 9 is used in the fields of textile sports fabrics, sanitary materials, packaging materials, fresh-keeping materials, biomedical materials, etc.

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