Needle-punched nonwoven material with dynamic heat and moisture transfer microenvironment and preparation method thereof

Abstract

The present invention relates to a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment and a preparation method thereof. The preparation method comprises the following steps: firstly, non-woven fabric A, non-woven fabric B, and non-woven fabric C are stacked one on top of the other, the moisture regains of non-woven fabric A, non-woven fabric B, and non-woven fabric C are increased in sequence, and the pore sizes are increased in sequence; then, needle-punching is performed to consolidate the non-woven fabric A, non-woven fabric B, and non-woven fabric C; the needle-punching depth is controlled so that the needle penetrates non-woven fabric A, non-woven fabric B, and non-woven fabric C; and the needle-punching density is controlled to be 500-1000 punctures / cm 2 The resulting needle-punched nonwoven material, which features a dynamic heat and moisture transfer microenvironment, is composed of a fine heat-conducting layer, a connecting channel layer, and an air intake and moisture removal layer, arranged sequentially from top to bottom. The present invention's simple preparation method allows heat and moisture to transfer through channels characterized by a gradient of pore size and increasing hydrophilicity, thereby creating an unstable moisture- and heat-conducting environment and exhibiting excellent air and moisture permeability.

Description

Technical Field

[0001] The invention belongs to the field of microfiber veneer leather and relates to a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment and a preparation method thereof. Background Art

[0002] Current veneer materials are broadly categorized as PVC artificial leather, regular PU leather, or microfiber PU leather. The base fabrics for these materials are typically composed of knitted fabrics, woven fabrics, regular non-woven fabrics, and microfiber non-woven fabrics. Regardless of the base material used, it is often constructed from a single fiber material, such as polypropylene or polyester. This single fiber structure results in a relatively simple material, offering only limited strength and softness, but lacking thermal comfort. To improve this, perforation is often required to increase skin-to-air contact and reduce fabric contact, ultimately achieving thermal comfort. This perforation design damages the yarn structure of knitted and woven fabrics, resulting in a strength loss of over 70%. Therefore, perforation often utilizes needle-punched non-woven fabrics. Needle-punched non-woven fabrics are made of intertwined fibers, creating a three-dimensional structure. Perforation does not disrupt the material structure, resulting in minimal loss of physical properties. However, current needle-punched non-woven materials have a very simple structure. Even after perforation, due to their uniformity across the thickness, heat and moisture circulation is nearly nonexistent, making them unable to meet market demand for functional non-woven materials.

[0003] At present, some composite materials that act on thermal and moist comfort with pore size gradient distribution and hydrophilicity gradient distribution have certain effects, but in essence, this composite is only a multi-layer superposition of different materials. The layers are separated and there are air gaps between them. Each layer is still a homogeneous material, and moist heat is still transferred in the homogeneous material of each layer. For example, CN214449035U "Microfiber-based synthetic leather fabric" reduces the diameter of the fiber capillary and forms a differential capillary effect between the inner and outer yarns to achieve directional movement of liquid water. The above design mainly achieves thermal comfort by moving liquid water in a specific direction. This unidirectional movement design is usually just a stacking of layers on a plane, and it cannot form non-steady-state transfer between layers in the thickness direction.

[0004] Therefore, it is necessary to develop a new needle-punched nonwoven material so that the microenvironment of the material can maintain a dynamic and flowable state, so that the human body can get a comfortable feeling when it comes into contact with the material. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem of insufficient thermal comfort of the single-structure veneer material grey cloth in the prior art, and to provide a needle-punched non-woven material with a dynamic heat and moisture transfer microenvironment and a preparation method thereof. Specifically, the present invention is based on needle-punching consolidation technology, and obtains a needle-punched non-woven material with a dynamic heat and moisture transfer microenvironment through fiber material selection and structural design.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A method for preparing a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment comprises: firstly, stacking nonwoven fabrics A, B, and C in sequence, wherein the moisture regains and pore sizes of the nonwoven fabrics A, B, and C are increased in sequence, and then performing needle-punching consolidation to consolidate the three independent nonwoven fabrics into a three-layer composite nonwoven fabric; controlling the needle-punching depth so that the needles penetrate the nonwoven fabrics A, B, and C, and the pore channels between adjacent layers are connected; and controlling the needle-punching density to be 500-1000 punches / cm 2 , so that the interval bands between layers disappear (that is, the layers are in an interconnected and inseparable state, the original three-layer interface changes from a sudden transition to a gradual transition, and the microscopic interface of each layer tends to be consistent), thus obtaining a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment.

[0008] The heat and moisture transfer of the present invention is dynamic; in addition to moisture conduction, it also creates an unstable gas environment. Conventional heat and moisture transfer is achieved by increasing moisture regain and decreasing pore size (achieving an increasing capillary effect). The present invention controls heat and moisture transfer solely through moisture regain, achieving an unstable microenvironment (increasing airflow velocity from outside to inside) through increasing pore size, rather than heat and moisture transfer. Furthermore, the connection of pore channels between adjacent layers is a unique technology of needle-punched nonwoven materials and is original to the present invention.

[0009] During the processing of the needle-punched nonwoven material of the present invention, the three layers of nonwoven fabric are prepared separately first, and then the interlayer needle-punched composite is performed. This method can flexibly control the structural characteristics of each layer, such as the pore size, moisture regain, and layer thickness ratio. The needle-punched composite requires strict control of the needle-punched depth and needle-punched density. The needle-punched depth needs to ensure that the fibers are connected in series along the thickness direction, and the needle-punched density needs to be controlled at 500-1000 needles / cm 2 If the needle density is too small, the pore channels between the layers cannot be connected, and there will be spacing zones between the layers; if the needle density is too large, the structure of the composite non-woven fabric will be too tight, the overall pore size will be excessively reduced, and the pore channel length will be compressed; in addition, the needle density must also take into account the strength of the material.

[0010] As the preferred technical solution:

[0011] A method for preparing a needle-punched nonwoven material having a dynamic heat and moisture transfer microenvironment as described above, wherein the difference in moisture regain between nonwoven fabric A and nonwoven fabric C is 5.4-6.5%, and the difference in pore size is 16-19 μm;

[0012] The difference in moisture regain between nonwoven fabric A and nonwoven fabric B is 1.3-1.9%, and the difference in pore size is 4-8 μm;

[0013] The difference in moisture regain between nonwoven fabric B and nonwoven fabric C was 3.5-4.8%, and the difference in pore size was 10-13 μm.

[0014] The method for preparing a needle-punched nonwoven material having a dynamic heat and moisture transfer microenvironment as described above, wherein the nonwoven fabric A is made of ultrafine fibers and processed by a needle-punching process;

[0015] Non-woven fabric B is made of hydrophilic fiber and microfiber using a needle punching process, where the mass proportion of microfiber is σ1;

[0016] Non-woven fabric C is made of hydrophilic fiber and ultrafine fiber and is processed by needle punching process, wherein the mass proportion of ultrafine fiber is σ2.

[0017] In the method for preparing a needle-punched nonwoven material having a dynamic heat and moisture transfer microenvironment as described above, the diameters of all ultrafine fibers are in the range of 3-5 μm, the diameters of all hydrophilic fibers are in the range of 15-30 μm, and the needle punching density of the needle punching process for preparing the nonwoven fabric A is in the range of 300-1000 punches / cm 2 The needle punching density of the needle punching process for preparing nonwoven fabric B is in the range of 300-800 needles / cm 2 The needle punching density of the nonwoven fabric C is in the range of 300-500 needles / cm 2 .

[0018] The present invention adjusts the values of σ1 and σ2, the diameter of the ultrafine fiber, the diameter of the hydrophilic fiber, and the needle punching density of the needle punching process so that the pore size difference between non-woven fabrics A and non-woven fabrics C is 16-19 μm, the pore size difference between non-woven fabrics A and non-woven fabrics B is 4-8 μm, and the pore size difference between non-woven fabrics B and non-woven fabrics C is 10-13 μm.

[0019] The present invention controls the diameter of the ultrafine fiber to be 3-5 microns. The diameter of the ultrafine fiber should not be too small, otherwise the fiber gaps in the upper layer will be too small, which is not conducive to airflow transmission; nor should it be too large, otherwise it will not be conducive to obtaining an ideal capillary effect to obtain a comfortable surface contact effect.

[0020] The diameter of the hydrophilic fiber of the present invention is controlled to be 15-30 microns. The diameter of the hydrophilic fiber should not be too small, otherwise it will not be possible to build large pores and form pore differences in the thickness direction, which will hinder the flow of gas; nor should it be too large, otherwise it will be too hard and affect the feel of the composite material.

[0021] The needle punching density of the needle punching process for preparing the non-woven fabric A is controlled to be in the range of 300-1000 needles / cm 2 The needle punching density of the needle punching process for preparing nonwoven fabric B is in the range of 300-800 needles / cm 2 The needle punching density of the nonwoven fabric C is in the range of 300-500 needles / cm 2 The adjustment of the needle punching density can further adjust the pore size of each layer of non-woven fabric before compounding. The smaller the needle punching density, the larger the pore size, and the larger the needle punching density, the smaller the pore size.

[0022] As described above, a method for preparing a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment, the web thickness of the needle-punching process for preparing non-woven fabric A is in the range of 0.3-0.5 mm, the web thickness of the needle-punching process for preparing non-woven fabric B is in the range of 0.3-0.6 mm, and the web thickness of the needle-punching process for preparing non-woven fabric C is in the range of 0.8-1.0 mm. The thickness ratio of non-woven fabric A, non-woven fabric B, and non-woven fabric C is 1:2:4.

[0023] When preparing non-woven fabrics A, B, and C, the needling density and the web thickness jointly determine the thickness of non-woven fabrics A, B, and C. Adjusting the needling density and web thickness can adjust the thickness ratio of non-woven fabrics A, B, and C. The thickness ratio of non-woven fabrics A, B, and C determines the path of gas flow in the thickness direction and affects the moisture conductivity. The optimal ratio is 1:2:4. This thickness design is positively correlated with the aperture ratio of the three layers, facilitating better moisture and heat conduction. If the thickness of non-woven fabric A accounts for too large a proportion, the air flow rate at the skin contact point decreases, the amount of heat carried away is reduced, and heat accumulation occurs. If the thickness of non-woven fabric C accounts for too large a proportion, the air entry channel increases, the time it takes for gas to enter non-woven fabric A is prolonged, and the heat transfer time is too long. If the thickness of non-woven fabric C accounts for too small a proportion, the moisture conductivity is insufficient.

[0024] In the method for preparing a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment as described above, the moisture regain of all ultrafine fibers is in the range of 1.6-2.3%, and the moisture regain of all hydrophilic fibers is in the range of ≥8%.

[0025] The present invention adjusts the values of σ1 and σ2, the moisture regain of the ultrafine fiber, and the moisture regain of the hydrophilic fiber so that the moisture regain difference between non-woven fabrics A and non-woven fabrics C is 5.4-6.5%, the moisture regain difference between non-woven fabrics A and non-woven fabrics B is 1.3-1.9%, and the moisture regain difference between non-woven fabrics B and non-woven fabrics C is 3.5-4.8%.

[0026] The present invention controls the moisture regain of the microfiber to be 1.6-2.3%. The moisture regain of the microfiber should not be too small, otherwise the comfort of the contact surface cannot be guaranteed and static electricity is easily generated; nor should it be too large, otherwise moisture will accumulate in a certain layer and cannot be quickly transferred.

[0027] The present invention controls the moisture regain of the hydrophilic fiber to be above 8%. The moisture regain of the hydrophilic fiber should not be too small, otherwise moisture will accumulate in a certain layer and cannot be quickly transferred.

[0028] The present invention also provides a needle-punched nonwoven material having a dynamic heat and moisture transfer microenvironment, which is prepared by any of the preparation methods described above and is composed of a fine heat-conducting layer, a connecting channel layer, and an air intake and moisture removal layer arranged in sequence from top to bottom;

[0029] The fine heat-conducting layer is formed by the non-woven fabric A after being consolidated by needle punching, the connecting channel layer is formed by the non-woven fabric B after being consolidated by needle punching, and the air intake and moisture removal layer is formed by the non-woven fabric C after being consolidated by needle punching.

[0030] As the preferred technical solution:

[0031] The needle-punched nonwoven material having a dynamic heat and moisture transfer microenvironment as described above has a thickness of 0.8-1.25 mm (depending on the thickness of nonwoven fabric A, the thickness of nonwoven fabric B, the thickness of nonwoven fabric C, and the needle punching density of the needle punching consolidation) and a moisture permeability of 5882-6512 g / m 2 / 24h, air permeability is 905-1212mm / s, and tensile strength at break is 333N-378N.

[0032] The principles of the present invention are as follows:

[0033] Existing designs typically utilize microfibers to create comfortable chemical fiber fabrics. Microfibers can create a strong capillary effect, allowing moisture to enter the fiber material from the skin contact layer without accumulating in the contact layer. However, the moisture diffusion and evaporation rate of this type of fabric is relatively slow. Simply using microfibers to form a fine thermal conductive layer (upper layer) is not sufficient to create a strong sense of comfort. Moisture in the fiber needs to be quickly discharged along the thickness direction to continuously eliminate sweat and maintain a comfortable feeling. Therefore, the present invention further provides a connecting channel layer (middle layer) and an air intake and moisture removal layer (lower layer). The fine thermal conductive layer is made of microfibers; the connecting channel layer and the air intake and moisture removal layer are both made of a blend of hydrophilic fibers and microfibers.

[0034] The hydrophilicity of each layer gradually increases from top to bottom. The increased hydrophilicity enables liquid / vapor water to obtain a driving force from top to bottom, allowing moisture to be transferred quickly from top to bottom.

[0035] The pore size of each layer increases gradually from top to bottom. The pore size of the lower layer is larger, which can facilitate the entry of outside air and reduce obstacles. The pore size of the upper layer is smaller, which can increase the air flow rate and allow moisture transfer.

[0036] The three layers are connected by fiber clusters in the thickness direction, the pore channels between the adjacent layers are connected, and the interval bands between the layers disappear. Figure 1 As shown, the number of heat and moisture circulation channels is one, and heat and moisture are actually transferred in the circulation channel (i.e., dynamic heat and moisture transfer microenvironment) with a gradient of pore size and gradually enhanced hydrophilicity formed by the ultrafine fibers 1 and the coarse fibers 2; Figure 2 As shown in the figure, when the pore channels between two adjacent layers are not connected and there is a spacer 3 between the layers, the number of heat and moisture circulation channels is three, which are located in the three layers respectively. Even if three layers of non-woven fabrics with different pore sizes made of the same material are stacked, there is still an independent steady-state heat and moisture transfer microenvironment between each layer, that is, the heat and moisture in each layer are actually transferred in the circulation channels with constant pore size and constant hydrophilic properties. The heat and moisture circulation channels do not obtain gradient changes, so the moisture conduction driving force in an unstable gas environment cannot be obtained.

[0037] The three-layer structure with different pore size and hydrophilicity differences, in which the interlayer pore channels are connected and the interval bands between the layers disappear, is a necessary condition for achieving a truly gradient non-steady-state heat and moisture flow environment. Only by utilizing the differences in pore size and hydrophilicity in the perpendicular plane direction of the non-woven fabric to achieve heat and moisture transfer in a specific direction can excellent moisture and heat conductivity be exerted. In the thickness direction, the differences in pore size and regain of each layer form the basis of the present invention, and the proportion of ultrafine fibers and hydrophilic fibers, two fibers with different characteristics, is used to adjust the degree of difference between the layers, ultimately adjusting the pore differences and moisture conductivity tendencies of each layer.

[0038] The inventors need to emphasize that the design of the connecting channel layer is indispensable in order to form a transition channel. Due to the non-steady state, a strong difference in pore size and moisture conductivity needs to be formed. However, if only a two-layer structure is designed, the fine heat-conducting layer and the air intake and moisture removal layer need to have a pore size difference of 20μm and a regain difference of 5.4-6.5%. However, the effect of the two layers is not good. It is speculated that due to the large difference in materials, there is a boundary in the transition area between the layers, and no effective driving force for moisture and heat conduction is obtained. After adding a connecting channel layer, the pore difference and hydrophilicity difference between the layers are reduced, forming an effective driving force for moisture and heat conduction, and smoothly transferring moisture and heat.

[0039] Beneficial effects:

[0040] The present invention forms a composite layer with gradually changing pore sizes to construct a gradually expanding gas channel, so that heat and moisture can be transferred in the gas channel, thereby forming an unstable moisture-conducting and heat-conducting environment. Compared with a simple three-layer stack, it has excellent air permeability and moisture permeability, and its moisture permeability is 5882-6512g / m 2 / 24h, air permeability is 905-1212mm / s, and tensile strength at break is 333N-378N. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the dynamic heat and moisture transfer microenvironment transfer of the present invention;

[0042] Figure 2 Schematic diagram of the steady-state heat and moisture transfer microenvironment of each layer before needling consolidation in the present invention;

[0043] Figure 3 1 is a flow chart of the preparation process of the nonwoven material of the present invention;

[0044] Among them, 1-microfiber, 2-coarse fiber, 3-spacer belt, 4-supporting net curtain, 5-punch needle, 6-winding device, 7-non-woven fabric A, 8-non-woven fabric B, 9-non-woven fabric C. DETAILED DESCRIPTION

[0045] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0046] The test methods for some indicators in the following embodiments are as follows:

[0047] Fiber diameter: Randomly select 30 fibers and measure their diameters, and the average value is taken as the fiber diameter;

[0048] Fiber moisture regain: The fiber moisture regain is determined in accordance with GB / T 9995-1997 "Textile materials - Determination of moisture content and moisture regain - Oven drying method", which is the test standard for fiber material moisture regain and actual moisture regain of composite materials.

[0049] Pore size: The pore size of the material is determined with reference to GB / T 21650.1-2008 "Determination of the Pore Size of Solid Materials by Mercury Intrusion Porosimetry and Gas Adsorption Method" to determine the pore size of the fiber material. The pore size refers to the average pore size determined in the standard.

[0050] Air permeability: Refer to GB / T 24218.15-2018 "Textiles—Nonwovens—Test Methods—Part 15: Determination of Air Permeability", 20mm aperture, 100Pa pressure test at 5 points;

[0051] Moisture permeability: Tested according to GB / T 12704.2-2009 "Test method for water vapor permeability of textile fabrics - Part 2: Evaporation method";

[0052] Tensile strength at break: Refer to GB / T 24218.3-2010 (Textiles—Nonwovens—Test methods—Part 3: Determination of maximum strength and elongation at break (Strip method)). Sample size: 200 × 50 cm, gauge: 100 cm, tensile speed: 100 mm / min. Average the test results five times in both the warp and weft directions for each sample.

[0053] The manufacturers, brands and physical properties of the fibers used in the following examples are as follows:

[0054] The brand of polyester fiber produced by Shanghai Huafeng Microfiber Technology Co., Ltd. is 010: the fiber diameter is 3.0μm and the fiber regain is 2.0%;

[0055] The brand of polyester fiber produced by Shanghai Huafeng Microfiber Technology Co., Ltd. is 012: the fiber diameter is 4.2μm and the fiber regain is 2.3%;

[0056] The brand of polyester fiber produced by Shanghai Huafeng Microfiber Technology Co., Ltd. is 013: the fiber diameter is 4.9μm and the fiber regain is 1.8%;

[0057] The brand of polyester fiber produced by Shanghai Huafeng Microfiber Technology Co., Ltd. is 023: the fiber diameter is 5.0μm and the fiber regain is 1.6%;

[0058] The brand produced by Henan Xinye Textile Co., Ltd. is 3128B cotton A010: fiber diameter is 15.2μm, fiber regain is 8.0%;

[0059] The brand produced by Henan Xinye Textile Co., Ltd. is 3128B cotton A011: the fiber diameter is 22.9μm, and the fiber regain is 8.6%;

[0060] The brand produced by Henan Xinye Textile Co., Ltd. is 3128B cotton A012: the fiber diameter is 30.0μm and the fiber regain is 8.4%.

[0061] Example 1

[0062] A method for preparing a needle-punched nonwoven material having a dynamic heat and moisture transfer microenvironment, such as Figure 3 As shown, the steps are as follows:

[0063] (1) Preparation of raw materials:

[0064] Microfiber I, II, and III: All are manufactured by Shanghai Huafeng Microfiber Technology Co., Ltd., and the brand is polyester fiber 010;

[0065] Hydrophilic fibers I and II: both are from Henan Xinye Textile Co., Ltd., brand 3128B cotton A010;

[0066] (2) preparing nonwoven fabric A7;

[0067] Using ultra-fine fiber I as raw material, the needle punching density is 300 needles / cm 2 The non-woven fabric A7 is obtained by processing with the following process; wherein, the thickness of the web laid by the needle punching process is 0.3 mm;

[0068] The prepared nonwoven fabric A7 had a thickness of 0.25 mm, a moisture regain of 2.0%, and a pore size of 8 μm;

[0069] (3) preparing nonwoven fabric B8;

[0070] Using hydrophilic fiber I and microfiber II as raw materials, the needle punching density is 300 needles / cm 2 The nonwoven fabric B8 is processed by the process of needle punching, wherein the thickness of the web laid by the needle punching process is 0.3 mm, and the mass proportion σ1 of the ultrafine fiber II is 75%;

[0071] The prepared nonwoven fabric B 8 had a thickness of 0.25 mm, a moisture regain of 3.3%, and a pore size of 12 μm;

[0072] (4) preparing non-woven fabric C 9;

[0073] Using hydrophilic fiber II and microfiber III as raw materials, the needle punching density is 300 needles / cm 2 The nonwoven fabric C 9 is processed by the process of needle punching to obtain the nonwoven fabric C 9; wherein, the thickness of the web laid by the needle punching process is 0.8 mm, and the mass proportion σ2 of the ultrafine fiber III is 20%;

[0074] The prepared nonwoven fabric C 9 had a thickness of 0.71 mm, a moisture regain of 7.4%, and a pore size of 24 μm;

[0075] (5) Non-woven fabric A 7, non-woven fabric B 8, and non-woven fabric C 9 are stacked one on top of the other and fed into the needling area through the support net curtain 4. Needle-punch consolidation is then performed using needles 5. The needling depth is controlled to be 3 mm, so that the needles penetrate non-woven fabric A 7, non-woven fabric B 8, and non-woven fabric C 9, and the pore channels between adjacent layers are connected. The needling density is controlled to be 500 needles / cm 2, so that the spacing bands between the layers disappear, and a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is obtained, and then the obtained needle-punched nonwoven material is rolled into a roll through the winding device 6.

[0076] The final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment consists of a fine heat-conducting layer, a connecting channel layer, and an air intake and moisture removal layer arranged in sequence from top to bottom;

[0077] The fine heat-conducting layer is formed by the non-woven fabric A7 after being consolidated by needle punching, the connecting channel layer is formed by the non-woven fabric B8 after being consolidated by needle punching, and the air intake and moisture removal layer is formed by the non-woven fabric C9 after being consolidated by needle punching.

[0078] The thickness of the final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is 1.15 mm and the moisture permeability is 6300 g / m 2 / 24h, air permeability is 1145mm / s, and tensile strength at break is 365N.

[0079] Comparative Example 1

[0080] A method for preparing a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is basically the same as Example 1, except that: non-woven fabric A, non-woven fabric B, and non-woven fabric C are stacked one on top of the other, and then needle-punched and consolidated, and the needle-punching density is controlled to be 300 needles / cm 2 .

[0081] The thickness of the final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is 1.18 mm and the moisture permeability is 4000 g / m 2 / 24h, air permeability is 655mm / s, and tensile strength at break is 228N.

[0082] By comparing Example 1 and Comparative Example 1, it can be seen that when the needle punching consolidation is performed in Comparative Example 1, the needle punching density is too small, which will cause the pore channels between the layers to be unable to fully connect, and there are still microscopic spacing bands between the layers, causing the gas to accumulate in the spacing bands instead of flowing in the pores that pass through the upper and lower layers.

[0083] Comparative Example 2

[0084] A method for preparing a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is basically the same as Example 1, except that: non-woven fabric A, non-woven fabric B, and non-woven fabric C are stacked one on top of the other, and then needle-punched and consolidated, and the needle-punching density is controlled to be 2000 needles / cm 2 .

[0085] The thickness of the final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is 0.8 mm and the moisture permeability is 5800 g / m 2 / 24h, air permeability is 801mm / s, and tensile strength at break is 450N.

[0086] By comparing Comparative Example 2 with Example 1, it can be seen that when the needle punching density of Comparative Example 2 is performed for needle punching consolidation, the air permeability and moisture permeability of the final product will be poor. This is because the needle punching density is too high, and the structure of the composite non-woven fabric will be too tight, so that the overall pore size is excessively reduced and the pore channel length is compressed, thereby affecting the air permeability and moisture permeability of the product.

[0087] Comparative Example 3

[0088] A method for preparing a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is basically the same as Example 1, except that: hydrophilic fiber I and ultrafine fiber II are not prepared in step (1), there is no step (3), and in step (5), non-woven fabric A and non-woven fabric C are stacked up and down in sequence, and then needle-punched and consolidated. That is, comparative example 3 removes non-woven fabric B relative to Example 1.

[0089] The thickness of the final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is 0.92 mm and the moisture permeability is 4192 g / m 2 / 24h, air permeability is 694mm / s, and tensile strength at break is 323N.

[0090] Comparing Comparative Example 3 with Example 1, it can be seen that Comparative Example 3 does not achieve significantly improved moisture permeability and air permeability by directly compounding the small-pore non-woven fabric layer A with the large-pore non-woven fabric layer C. This is because the pore channels between the layers cannot be fully connected, making it impossible for the gas to circulate in the pores running through the upper and lower layers, making it difficult to obtain a non-steady-state environment suitable for heat and moisture conduction.

[0091] Example 2

[0092] A method for preparing a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment, comprising the following steps:

[0093] (1) Preparation of raw materials:

[0094] Microfiber I, II, and III: All are manufactured by Shanghai Huafeng Microfiber Technology Co., Ltd., and the brand is polyester fiber 010;

[0095] Hydrophilic fibers I and II: both are from Henan Xinye Textile Co., Ltd., brand 3128B cotton A010;

[0096] (2) preparing non-woven fabric A;

[0097] Using ultra-fine fiber I as raw material, the needle punching density is 300 needles / cm 2The non-woven fabric A is obtained by processing the non-woven fabric by the needle punching process, wherein the thickness of the web laid by the needle punching process is 0.3 mm;

[0098] The prepared nonwoven fabric A had a thickness of 0.25 mm, a moisture regain of 1.9%, and a pore size of 8 μm;

[0099] (3) preparing non-woven fabric B;

[0100] Using hydrophilic fiber I and microfiber II as raw materials, the needle punching density is 300 needles / cm 2 The nonwoven fabric B is obtained by the process of needle punching, wherein the thickness of the web is 0.3 mm, and the mass proportion σ1 of the ultrafine fiber II is 70%;

[0101] The prepared nonwoven fabric B had a thickness of 0.25 mm, a moisture regain of 3.6%, and a pore size of 13 μm;

[0102] (4) preparing non-woven fabric C;

[0103] Using hydrophilic fiber II and microfiber III as raw materials, the needle punching density is 330 needles / cm 2 The nonwoven fabric C is obtained by the process of needle punching, wherein the thickness of the web is 0.8 mm, and the mass proportion σ2 of the ultrafine fiber III is 15%;

[0104] The prepared nonwoven fabric C had a thickness of 0.71 mm, a moisture regain of 7.7%, and a pore size of 25 μm;

[0105] (5) Non-woven fabrics A, B, and C are stacked one on top of the other and fed into the needle punching area through a supporting net curtain. Needle punching is then performed to consolidate the fabrics. The needle punching depth is controlled to be 3 mm, so that the needle penetrates non-woven fabrics A, B, and C, and the pore channels between adjacent layers are connected. The needle punching density is controlled to be 500 needles / cm 2 , so that the spacing bands between the layers disappear, and a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is obtained, and then the obtained needle-punched nonwoven material is rolled into a roll through a winding device.

[0106] The final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment consists of a fine heat-conducting layer, a connecting channel layer, and an air intake and moisture removal layer arranged in sequence from top to bottom;

[0107] The fine heat-conducting layer is formed by the non-woven fabric A after being consolidated by needle punching, the connecting channel layer is formed by the non-woven fabric B after being consolidated by needle punching, and the air intake and moisture removal layer is formed by the non-woven fabric C after being consolidated by needle punching.

[0108] The thickness of the final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is 1.15 mm and the moisture permeability is 6342 g / m2 / 24h, air permeability is 1121mm / s, and tensile strength at break is 353N.

[0109] Example 3

[0110] A method for preparing a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment, comprising the following steps:

[0111] (1) Preparation of raw materials:

[0112] Microfiber I, II, and III: All are manufactured by Shanghai Huafeng Microfiber Technology Co., Ltd., and the brand is polyester fiber 012;

[0113] Hydrophilic fibers I and II: both are from Henan Xinye Textile Co., Ltd., brand 3128B cotton A011;

[0114] (2) preparing non-woven fabric A;

[0115] Using ultra-fine fiber I as raw material, the needle punching density is 700 needles / cm 2 The non-woven fabric A is obtained by processing the non-woven fabric by the needle punching process, wherein the thickness of the web laid by the needle punching process is 0.4 mm;

[0116] The prepared nonwoven fabric A had a thickness of 0.2 mm, a moisture regain of 2.1%, and a pore size of 7 μm;

[0117] (3) preparing non-woven fabric B;

[0118] Using hydrophilic fiber I and microfiber II as raw materials, the needle punching density is 500 needles / cm 2 The nonwoven fabric B is obtained by the process of needle punching, wherein the thickness of the web laid by the needle punching process is 0.5 mm, and the mass proportion σ1 of the ultrafine fiber II is 78%;

[0119] The prepared nonwoven fabric B had a thickness of 0.4 mm, a moisture regain of 3.8%, and a pore size of 13 μm;

[0120] (4) preparing non-woven fabric C;

[0121] Using hydrophilic fiber II and microfiber III as raw materials, the needle punching density is 350 needles / cm 2 The nonwoven fabric C is obtained by the process of needle punching, wherein the thickness of the web laid by the needle punching process is 1.0 mm, and the mass proportion σ2 of the ultrafine fiber III is 0%;

[0122] The prepared nonwoven fabric C had a thickness of 0.8 mm, a moisture regain of 8.6%, and a pore size of 26 μm;

[0123] (5) Non-woven fabrics A, B, and C are stacked one on top of the other and fed into the needle punching area through a supporting net curtain. Needle punching is then performed to consolidate the fabrics. The needle punching depth is controlled to be 4 mm, so that the needle penetrates non-woven fabrics A, B, and C, and the pore channels between adjacent layers are connected. The needle punching density is controlled to be 700 needles / cm 2 , so that the spacing bands between the layers disappear, and a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is obtained, and then the obtained needle-punched nonwoven material is rolled into a roll through a winding device.

[0124] The final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment consists of a fine heat-conducting layer, a connecting channel layer, and an air intake and moisture removal layer arranged in sequence from top to bottom;

[0125] The fine heat-conducting layer is formed by the non-woven fabric A after being consolidated by needle punching, the connecting channel layer is formed by the non-woven fabric B after being consolidated by needle punching, and the air intake and moisture removal layer is formed by the non-woven fabric C after being consolidated by needle punching.

[0126] The thickness of the final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is 1.25 mm and the moisture permeability is 6512 g / m 2 / 24h, air permeability is 1212mm / s, and tensile strength at break is 344N.

[0127] Example 4

[0128] A method for preparing a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is basically the same as Example 3, except that the thickness of the web laid in the needle-punching process in step (4) is 0.9 mm, and the thickness of the obtained nonwoven fabric C is 0.65 mm.

[0129] The thickness of the final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is 1.18 mm and the moisture permeability is 5882 g / m 2 / 24h, air permeability is 1011mm / s, and tensile strength at break is 333N.

[0130] Comparing Example 3 with Example 4, it can be seen that after the thickness of the non-woven fabric C prepared in Example 4 is reduced, the moisture permeability of the prepared needle-punched nonwoven material is significantly reduced.

[0131] Example 5

[0132] A method for preparing a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment, comprising the following steps:

[0133] (1) Preparation of raw materials:

[0134] Microfiber I, II, and III: All are manufactured by Shanghai Huafeng Microfiber Technology Co., Ltd., and the brand is polyester fiber 013;

[0135] Hydrophilic fibers I and II: both are from Henan Xinye Textile Co., Ltd., brand 3128B cotton A012;

[0136] (2) preparing non-woven fabric A;

[0137] Using ultra-fine fiber I as raw material, the needle punching density is 1000 needles / cm 2 The non-woven fabric A is obtained by processing the non-woven fabric by the needle punching process, wherein the thickness of the web laid by the needle punching process is 0.5 mm;

[0138] The prepared nonwoven fabric A had a thickness of 0.15 mm, a moisture regain of 1.9%, and a pore size of 6 μm;

[0139] (3) preparing non-woven fabric B;

[0140] Using hydrophilic fiber I and microfiber II as raw materials, the needle punching density is 800 needles / cm 2 The nonwoven fabric B is obtained by the process of needle punching, wherein the thickness of the web is 0.6 mm, and the mass proportion σ1 of the ultrafine fiber II is 76%;

[0141] The prepared nonwoven fabric B had a thickness of 0.3 mm, a moisture regain of 3.6%, and a pore size of 14 μm;

[0142] (4) preparing non-woven fabric C;

[0143] Using hydrophilic fiber II and microfiber III as raw materials, the needle punching density is 400 needles / cm 2 The nonwoven fabric C is obtained by the process of needle punching, wherein the thickness of the web is 0.9 mm, and the mass proportion σ2 of the ultrafine fiber III is 10%;

[0144] The prepared nonwoven fabric C had a thickness of 0.6 mm, a moisture regain of 8%, and a pore size of 25 μm;

[0145] (5) Non-woven fabrics A, B, and C are stacked one on top of the other and fed into the needle punching area through a drag net curtain. Needle punching is then performed to consolidate the fabrics. The needle punching depth is controlled to be 5 mm, so that the needle penetrates non-woven fabrics A, B, and C, and the pore channels between adjacent layers are connected. The needle punching density is controlled to be 1000 needles / cm 2 , so that the spacing bands between the layers disappear, and a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is obtained, and then the obtained needle-punched nonwoven material is rolled into a roll through a winding device.

[0146] The final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment consists of a fine heat-conducting layer, a connecting channel layer, and an air intake and moisture removal layer arranged in sequence from top to bottom;

[0147] The fine heat-conducting layer is formed by the non-woven fabric A after being consolidated by needle punching, the connecting channel layer is formed by the non-woven fabric B after being consolidated by needle punching, and the air intake and moisture removal layer is formed by the non-woven fabric C after being consolidated by needle punching.

[0148] The thickness of the final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is 0.8 mm and the moisture permeability is 6250 g / m 2 / 24h, air permeability is 989mm / s, and tensile strength at break is 345N.

[0149] Example 6

[0150] A method for preparing a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment, comprising the following steps:

[0151] (1) Preparation of raw materials:

[0152] Microfiber I: The manufacturer is Shanghai Huafeng Microfiber Technology Co., Ltd., and the brand is polyester fiber 023;

[0153] Microfiber II and III: Both are manufactured by Shanghai Huafeng Microfiber Technology Co., Ltd., with the brand name of polyester fiber 013;

[0154] Hydrophilic fibers I and II: both are from Henan Xinye Textile Co., Ltd., brand 3128B cotton A012;

[0155] (2) preparing non-woven fabric A;

[0156] Using ultra-fine fiber I as raw material, the needle punching density is 1000 needles / cm 2 The non-woven fabric A is obtained by processing the non-woven fabric by the needle punching process, wherein the thickness of the web laid by the needle punching process is 0.5 mm;

[0157] The prepared nonwoven fabric A had a thickness of 0.15 mm, a moisture regain of 1.7%, and a pore size of 6 μm;

[0158] (3) preparing non-woven fabric B;

[0159] Using hydrophilic fiber I and microfiber II as raw materials, the needle punching density is 800 needles / cm 2 The nonwoven fabric B is obtained by the process of needle punching, wherein the thickness of the web is 0.6 mm, and the mass proportion σ1 of the ultrafine fiber II is 76%;

[0160] The prepared nonwoven fabric B had a thickness of 0.3 mm, a moisture regain of 3.6%, and a pore size of 14 μm;

[0161] (4) preparing non-woven fabric C;

[0162] Using hydrophilic fiber II and microfiber III as raw materials, the needle punching density is 500 needles / cm 2 The non-woven fabric C is obtained by the process of needle punching, wherein the thickness of the web is 0.8 mm, and the mass proportion σ2 of the ultrafine fiber III is 26%;

[0163] The prepared nonwoven fabric C had a thickness of 0.55 mm, a moisture regain of 7.1%, and a pore size of 24 μm;

[0164] (5) Non-woven fabrics A, B, and C are stacked one on top of the other and fed into the needle punching area through a drag net curtain. Needle punching is then performed to consolidate the fabrics. The needle punching depth is controlled to be 5 mm, so that the needle penetrates non-woven fabrics A, B, and C, and the pore channels between adjacent layers are connected. The needle punching density is controlled to be 1000 needles / cm 2 , so that the spacing bands between the layers disappear, and a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is obtained, and then the obtained needle-punched nonwoven material is rolled into a roll through a winding device.

[0165] The final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment consists of a fine heat-conducting layer, a connecting channel layer, and an air intake and moisture removal layer arranged in sequence from top to bottom;

[0166] The fine heat-conducting layer is formed by the non-woven fabric A after being consolidated by needle punching, the connecting channel layer is formed by the non-woven fabric B after being consolidated by needle punching, and the air intake and moisture removal layer is formed by the non-woven fabric C after being consolidated by needle punching.

[0167] The thickness of the final needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment is 0.8 mm and the moisture permeability is 6123 g / m 2 / 24h, air permeability is 905mm / s, and tensile strength at break is 378N.

Claims

1. A method for preparing a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment, characterized in that: First, non-woven fabrics A, B, and C are stacked up and down in sequence. The moisture regain and pore size of non-woven fabrics A, B, and C are increased in sequence. Then, acupuncture is performed to consolidate the non-woven fabrics. The acupuncture depth is controlled so that the needle penetrates non-woven fabrics A, B, and C. The acupuncture density is controlled to be 500-1000 needles / cm 2 , thus obtaining a needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment; Non-woven fabric A is made of ultrafine fibers and processed by needle punching. Non-woven fabric B is made of hydrophilic fibers and ultrafine fibers and processed by needle punching, where the mass proportion of ultrafine fibers is σ1. Non-woven fabric C is made of hydrophilic fibers and ultrafine fibers and processed by needle punching, where the mass proportion of ultrafine fibers is σ2. The diameter of all microfibers is in the range of 3-5 microns, the diameter of all hydrophilic fibers is in the range of 15-30 microns, and the needle punching density of the needle punching process for preparing nonwoven fabric A is in the range of 300-1000 needles / cm 2 The needle punching density of the needle punching process for preparing nonwoven fabric B is in the range of 300-800 needles / cm 2 The needle punching density of the nonwoven fabric C is in the range of 300-500 needles / cm 2 ; The difference in moisture regain between non-woven fabric A and non-woven fabric C is 5.4-6.5%, and the difference in pore size is 16-19 μm; the difference in moisture regain between non-woven fabric A and non-woven fabric B is 1.3-1.9%, and the difference in pore size is 4-8 μm; the difference in moisture regain between non-woven fabric B and non-woven fabric C is 3.5-4.8%, and the difference in pore size is 10-13 μm.

2. The method for preparing a needle-punched nonwoven material having a dynamic heat and moisture transfer microenvironment according to claim 1, characterized in that: The web thickness of the needle punching process for preparing non-woven fabric A ranges from 0.3 to 0.5 mm, the web thickness of the needle punching process for preparing non-woven fabric B ranges from 0.3 to 0.6 mm, and the web thickness of the needle punching process for preparing non-woven fabric C ranges from 0.8 to 1.0 mm. The thickness ratio of non-woven fabric A, non-woven fabric B, and non-woven fabric C is 1:2:

4.

3. The method for preparing a needle-punched nonwoven material having a dynamic heat and moisture transfer microenvironment according to claim 1, characterized in that: The moisture regain of all microfibers is in the range of 1.6-2.3%, and the moisture regain of all hydrophilic fibers is in the range of ≥8%.

4. The needle-punched nonwoven material having a dynamic heat and moisture transfer microenvironment prepared by the preparation method according to any one of claims 1 to 3, characterized in that: It consists of a fine heat-conducting layer, a connecting channel layer, and an air intake and moisture removal layer arranged in sequence from top to bottom; The fine heat-conducting layer is formed by the non-woven fabric A after being consolidated by needle punching, the connecting channel layer is formed by the non-woven fabric B after being consolidated by needle punching, and the air intake and moisture removal layer is formed by the non-woven fabric C after being consolidated by needle punching.

5. The needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment according to claim 4, characterized in that: The needle-punched nonwoven material with a dynamic heat and moisture transfer microenvironment has a thickness of 0.8-1.25 mm and a moisture permeability of 5882-6512 g / m 2 / 24h, air permeability is 905-1212mm / s, and tensile strength at break is 333N-378N.

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