Composite fabric, preparation method thereof and textile

Abstract

The invention belongs to the technical field of textiles, and particularly relates to a composite fabric, a preparation method thereof and a textile. The composite fabric is formed by sequentially compounding a first fabric layer, a film layer, a comfortable layer and a second fabric layer through adhesive hot melting in the thickness direction, the first fabric layer and the film layer are compounded through adhesive point-like hot melting, the film layer and the comfortable layer are compounded through adhesive point-like hot melting, and the film layer is made of a polytetrafluoroethylene film or a film formed by modified polytetrafluoroethylene. According to the application, a waterproof, moisture-permeable and air-permeable polytetrafluoroethylene film or a film formed by modified polytetrafluoroethylene is selected as a film layer material, and the first fabric layer and the film layer as well as the film layer and the comfortable layer are compounded through adhesive point-like hot melting; the technical problems of poor air permeability and poor moisture permeability caused by the fact that the adhesive covers the contact surface between the film layer and the adjacent layer in the compounding process are solved, so that the composite fabric has air permeability, waterproofness and moisture permeability, and the comfort of the composite fabric is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles, and in particular relates to a composite fabric, a preparation method thereof and a textile. Background Art

[0002] At present, commercially available bedding products, such as mattress protectors (covers), bed covers, bed pads, bed covers, etc., usually use composite fabrics as a protective layer to prevent liquids from penetrating into the mattress, and avoid cleaning difficulties and hygiene problems caused by stains on the mattress. Such composite fabrics usually have certain waterproofness and moisture permeability to cope with common liquid pollution in daily life, such as children's bedwetting, elderly incontinence, women's menstrual period, pet stains, etc. However, although existing bed pads can effectively prevent liquid penetration, they have the following defects in terms of breathability: poor breathability, especially when used for a long time, may cause users to feel stuffy and uncomfortable, thereby affecting sleep quality, especially for users who have long-term contact with bedding, such as pregnant women, infants, the elderly, etc., the importance of breathability is particularly prominent.

[0003] Existing waterproof and breathable composite fabrics (such as waterproof and breathable materials used in jackets) have high waterproofness and breathability, but they focus on how to enhance windproof performance, which results in poor breathability. This type of fabric is not suitable for use as a material for household bedding protectors because it focuses too much on waterproof and windproof performance and ignores the need for breathability of bedding.

[0004] In summary, there is an urgent need to develop a composite fabric with good waterproof properties so that the fabric has high moisture permeability and air permeability at the same time, effectively preventing liquid from penetrating into the mattress without affecting the comfort of bedding, especially in hot weather or long-term use, it can maintain good air permeability and avoid the discomfort caused by stuffiness or sweating. Summary of the invention

[0005] In view of this, the present invention provides a composite fabric, a preparation method thereof and a textile product to solve the problems that the above-mentioned composite fabric only has waterproof and moisture permeability but poor air permeability, and the composite fabric is endowed with good waterproof performance, so that the fabric has high moisture permeability and air permeability at the same time, effectively preventing liquid from penetrating into the mattress without affecting the comfort of the bedding, especially in hot weather or under long-term use, it can maintain good air permeability and avoid the discomfort caused by stuffiness or sweating.

[0006] The inventors also found that in the related art, composite fabrics are usually composited with adhesives. However, during the composite process, the adhesives will reduce the contact area between the film layer and the adjacent layers, resulting in poor air permeability and poor moisture permeability.

[0007] To achieve the above solution, the technical solution of the present invention is as follows:

[0008] In the first aspect, the present application provides a composite fabric, which is composed of a first fabric layer, a membrane layer, a comfort layer, a spacer fabric layer and a second fabric layer, which are compounded in sequence along the thickness direction by adhesive, and the first fabric layer and the membrane layer and the comfort layer are both compounded by adhesive point-shaped hot-melt bonding, and the material of the membrane layer is a polytetrafluoroethylene film (i.e., PTFE film) or a film formed by modified polytetrafluoroethylene.

[0009] Optionally, the first fabric layer is made of anti-slip fabric, knitted fabric or brushed fabric formed by at least one of natural fiber, polyester fiber and polyurethane fiber.

[0010] It should be noted that, in the present application, the term "knitted fabric" refers to a fabric formed by bending yarn into loops and interlacing them with knitting needles.

[0011] Optionally, the pore size formed by the polytetrafluoroethylene or modified polytetrafluoroethylene is 5-15 μm, preferably 6-15 μm.

[0012] Optionally, the film layer has a thickness of 5-15 μm, preferably 6-10 μm.

[0013] Optionally, the comfort layer is made of sponge, fiber felt, foam or silicone cotton.

[0014] Optionally, the sponge is selected from polyurethane sponge, polyvinyl alcohol sponge or polyester sponge.

[0015] Optionally, the thickness of the comfort layer is 0.1-0.3 cm, preferably 0.15-0.3 cm.

[0016] Optionally, the second fabric layer is made of natural fiber fabric, polyester fiber fabric, or woven fabric, knitted fabric or brushed fabric formed by natural fiber and polyester fiber.

[0017] It should be noted that, in the present application, the term "woven fabric" refers to a fabric formed by winding or interweaving yarns with each other.

[0018] Optionally, the adhesive between the first fabric layer and the membrane layer and between the membrane layer and the comfort layer is selected from a first adhesive, and the first adhesive is selected from a moisture-curing reactive polyurethane hot melt adhesive (i.e., PUR hot melt adhesive) with a viscosity of 3400-5000cps at 90°C.

[0019] Optionally, the comfort layer and the second fabric are formed by hot-melt bonding with an adhesive network.

[0020] Optionally, the areal density of the adhesive in the adhesive regions located between the first fabric layer and the film layer and between the film layer and the comfort layer is 5-10 g / m 2 , preferably 6-10 g / m 2 .

[0021] Optionally, the areal density of the adhesive in the adhesive region located between the comfort layer and the second fabric layer is 10-20 g / m 2 , preferably 12-20 g / m 2 .

[0022] Optionally, the adhesive located between the comfort layer and the second fabric is selected from a second adhesive, and the second adhesive is a moisture-curing reactive polyurethane hot melt adhesive with a viscosity of 4500-6000 cps at 110 °C.

[0023] Optionally, the thickness of the adhesive is 20-50 μm, preferably 25-50 μm.

[0024] Optionally, the composite fabric further includes a spacer fabric layer, and the spacer fabric layer is located between the comfort layer and the second fabric layer.

[0025] Optionally, the material of the spacer fabric layer is a spacer fabric formed of at least one of natural fiber and polyester fiber.

[0026] It should be noted that in this application, the term "spacer fabric" refers to a fabric formed by several groups of yarns to form two or more layers of cloth, and another group of yarns connects the layers of cloth to form the fabric.

[0027] Optionally, the thickness of the spacer fabric layer is 0.2-0.4 cm, preferably 0.25-0.4 cm.

[0028] Optionally, both between the spacer fabric layer and the comfort layer and between the spacer fabric layer and the second fabric are formed by reticular hot melt compounding with the second adhesive.

[0029] Optionally, the areal density of the adhesive in the adhesive regions located between the spacer fabric layer and the comfort layer and between the spacer fabric layer and the second fabric layer is 10-20 g / m 2 , preferably 12-20 g / m 2 .

[0030] Optionally, the second fabric layer is provided with a plurality of recesses, and all the recesses communicate with each other.

[0031] Optionally, the bottom surface of the first fabric layer is provided with a plurality of anti-slip points.

[0032] In a second aspect, the present application also provides a method for preparing the composite fabric as described above, the preparation method comprising the following steps:

[0033] The first fabric layer is bonded to the film layer by the adhesive, pressed, cooled, reacted with moisture, and cured, then bonded to the comfort layer, pressed, cooled, reacted with moisture, and cured, and then bonded to the second fabric layer, pressed, cooled, reacted with moisture, and cured to obtain the composite fabric.

[0034] Optionally, before bonding, the first fabric layer and / or the film is subjected to a corona treatment.

[0035] Optionally, when the adhesive is selected from the first adhesive, the coating temperature of the adhesive is 90-100°C, preferably 95-100°C.

[0036] Optionally, when the adhesive is selected from the second adhesive, the coating temperature of the adhesive is 110-120°C, preferably 115-120°C.

[0037] Optionally, when the adhesive is selected from the first adhesive, the open time of the adhesive is 15-30 seconds, preferably 16-30 seconds.

[0038] Optionally, when the adhesive is selected from the second adhesive, the open time of the adhesive is 25-45 s, preferably 26-45 s.

[0039] Optionally, the coating speed of the adhesive is 40-60 m / min, preferably 45-60 m / min.

[0040] Optionally, the pressing pressure is 40-60N, preferably 45-60N.

[0041] Optionally, the relative humidity of the moisture reaction is 60% RH-70% RH, preferably 65% ​​RH-70% RH.

[0042] Optionally, the duration of the moisture reaction is 15-45 s, preferably 20-45 s.

[0043] Optionally, the cooling rate is 3-5°C / min, preferably 3.5-5°C / min.

[0044] Optionally, after the last aging and curing, the following step is further included: hot pressing to form a plurality of recesses, all of which are interconnected.

[0045] Optionally, the temperature of the hot pressing is 180-220°C, preferably 200-220°C; the pressure of the hot pressing is 0.3-0.5Mpa, preferably 0.3-0.5MPa; the duration of the hot pressing is 24-48h, preferably 25-48h.

[0046] In a third aspect, the present application also provides a textile, which is made of the composite fabric as described above or the composite fabric prepared according to the method as described above.

[0047] In this application, textiles include but are not limited to: mattress protectors (covers), bed covers, bed pads, bed covers and other materials.

[0048] As described above, the composite fabric and the preparation method thereof and the textile of the present invention have the following beneficial effects:

[0049] The present application selects a polytetrafluoroethylene film or a film formed by modified polytetrafluoroethylene which is waterproof, moisture permeable and breathable as the material of the membrane layer, and the first fabric layer and the membrane layer as well as the membrane layer and the comfort layer are compounded by adhesive point-shaped hot-melt bonding, thereby avoiding the technical problem of poor air permeability and moisture permeability caused by the adhesive covering the contact surface between the membrane layer and the adjacent layer during the compounding process, thereby making the composite fabric have breathability, waterproofness and moisture permeability, thereby improving the comfort of the composite fabric.

[0050] The present application selects a low-modulus, high-elasticity moisture-curing reactive polyurethane hot melt adhesive (i.e., PUR hot melt adhesive) as the adhesive in the composite process, and combines it with point hot melt composite technology. It can improve flexibility and comfort while ensuring the bonding effect between the film layer and the adjacent layers, avoid the technical problems of poor air permeability and poor moisture permeability caused by the contact surface between the covering film layer and the adjacent layers during the composite process, and thus improve the air permeability and moisture permeability of the composite fabric.

[0051] The present application selects a membrane with a specific pore size and thickness (the pore size of the membrane is 5-15μm, and the thickness of the membrane is 5-15μm), and sequentially combines the first fabric layer, the membrane layer, the comfort layer and the second fabric layer along the thickness direction through hot-melt bonding with an adhesive to form a composite fabric, thereby avoiding the technical problem of poor air permeability and poor moisture permeability caused by the adhesive covering the contact surface between the membrane layer and the adjacent layers during the bonding process, thereby further improving the air permeability and moisture permeability of the composite fabric.

[0052] The present application controls the coating density, coating speed, coating temperature and other parameters of the adhesive within a specific range, thereby ensuring the bonding effect while avoiding the problems of poor air permeability and poor moisture permeability caused by the adhesive covering the contact surface during the composite process, thereby improving the air permeability and moisture permeability of the composite fabric, and thus making the composite fabric have both waterproof performance, air permeability and moisture permeability.

[0053] By controlling the cooling rate within a specific range, this application can prevent the adhesive layer from being uneven or having bubbles, ensure the flatness of the composite fabric, avoid the adverse effects on air permeability and moisture permeability caused by bubbles or uneven adhesive layers, and thus improve the air permeability and moisture permeability of the fabric.

[0054] By controlling the relative humidity of the moisture reaction within a specific range, this application can, while ensuring the bonding effect, avoid the problems of poor air permeability and poor moisture permeability caused by the adhesive covering the contact surfaces of each layer during the composite process, and improve the air permeability and moisture permeability of the composite fabric.

[0055] By adding a hot pressing step after the last aging and curing, this application can form several concave portions on the surface of the composite fabric and form moisture-permeable channels between all the concave portions to facilitate the circulation of heat and insensible perspiration, thereby enhancing the air permeability, moisture permeability and comfort of the composite fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a cross-sectional view of the composite fabric of Example 1, wherein 1 - the first fabric layer, 2 - the film layer, 3 - the comfort layer, 4 - the spacer fabric layer, 5 - the second fabric layer;

[0057] Figure 2 It is a top view of the composite fabric of Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0058] The present invention will be further described below through specific examples. It should be noted that the specific material ratios, process conditions, results, etc. described in the embodiments of the present invention are only used to illustrate the present invention and cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

[0059] One embodiment of this application provides a composite fabric, which is composed of a first fabric layer, a film layer with a thickness of 5 - 15 μm, a comfort layer with a thickness of 0.1 - 0.3 cm, and a second fabric layer, which are sequentially compounded along the thickness direction through an adhesive with a thickness of 20 - 50 μm;

[0060] The first fabric layer and the film layer, as well as the film layer and the spacer fabric layer, are compounded by dot melting of the first adhesive. The surface density of the first adhesive in the adhesive area located between the first fabric layer and the film layer or between the film layer and the comfort layer is 5 - 10 g / m 2; The first adhesive is selected from a moisture-curing reactive polyurethane hot melt adhesive with a viscosity of 3400-5000cps at a temperature of 90°C; the material of the first fabric layer is a non-slip fabric, a knitted fabric or a brushed fabric formed by at least one of natural fiber, polyester fiber and polyurethane fiber; the material of the membrane layer is a membrane formed by polytetrafluoroethylene membrane or modified polytetrafluoroethylene, and the pore size of the polytetrafluoroethylene membrane or the membrane formed by modified polytetrafluoroethylene is 5-15μm;

[0061] The comfort layer and the second fabric are formed by hot-melt bonding of the second adhesive. The surface density of the second adhesive in the bonding area between the comfort layer and the second fabric layer is 10-20 g / m 2 The second adhesive is selected from a moisture-curing reactive polyurethane hot melt adhesive with a viscosity of 4500-6000cps at a temperature of 110°C, and the material of the comfort layer is sponge, fiber felt, foam or silicone cotton;

[0062] The material of the second fabric layer is woven fabric, knitted fabric or brushed fabric formed by at least one of natural fiber and polyester fiber.

[0063] In another embodiment of the present invention, the composite fabric further includes a spacer fabric layer with a thickness of 0.2-0.4 cm, the spacer fabric layer is located between the comfort layer and the second fabric layer, the spacer fabric layer and the comfort layer and the spacer fabric layer and the second fabric layer are formed by a mesh hot-melt composite of a second adhesive, and the surface density of the second adhesive in the adhesive area between the spacer fabric layer and the comfort layer and between the spacer fabric layer and the second fabric layer is 10-20 g / m 2 The material of the spacer fabric layer is a spacer fabric made of at least one of natural fiber and polyester fiber.

[0064] In another embodiment of the present invention, the second fabric layer is provided with a plurality of recesses, all of which are interconnected, and the depth of the recesses is 40-60 μm.

[0065] Another embodiment of the present application also provides a method for preparing the composite fabric as described above, comprising the following steps:

[0066] The first fabric layer and the film layer are bonded together by the first adhesive at a speed of 40-60m / min, pressed at a pressure of 40-60N, cooled, reacted with moisture for 15-45s at a relative humidity of 60%RH-70%RH, and cured. Then, the first fabric layer and the spacer fabric layer are bonded together by the first adhesive at a speed of 40-60m / min, pressed at a pressure of 40-60N, cooled, reacted with moisture for 15-45s at a relative humidity of 60%RH-70%RH, and cured. Then, the second fabric layer and the second fabric layer are bonded together by the second adhesive at a speed of 40-60m / min, pressed at a pressure of 40-60N, cooled, reacted with moisture for 15-45s at a relative humidity of 60%RH-70%RH, and cured to obtain a composite fabric.

[0067] In another embodiment of the present application, after the last aging and curing, the following steps are also included: hot pressing for 24-48 hours at a temperature of 180-220° C. and a pressure of 0.3-0.5 MPa to form a plurality of recesses, and all the recesses are interconnected.

[0068] Another embodiment of the present application further provides a textile, which is made of the composite fabric as described above or the composite fabric prepared according to the method as described above.

[0069] The present invention is described in detail below by specific examples. It should also be understood that the following examples are only used to specifically illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention belong to the scope of protection of the present invention. The specific process parameters and the like in the following examples are also only examples within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description herein, and are not limited to the specific values ​​​​exemplified below.

[0070] Example 1

[0071] A method for preparing a composite fabric, the specific steps are as follows:

[0072] S1. The surface layer (i.e., the layer opposite to the bottom surface) of a 50D 100% polyester weft knitted single-sided plain fabric (the bottom surface is evenly provided with a number of anti-slip points, commercially available) is coated with PUR hot melt adhesive A (viscosity of 4200±800cps at 90°C, commercially available) by a dot roller at a temperature of 90°C and a speed of 40m / min. The open time of PUR hot melt adhesive A is 30s and the coating density is 5g / m 2 , coating thickness is 20μm;

[0073] S2. Then, a PTFE membrane having an average pore size of 5 μm and a thickness of 5-8 μm was corona treated to obtain a pretreated PTFE membrane; the pretreated PTFE membrane was laminated to one side of the above-mentioned plain cloth coated with PUR hot melt adhesive, pressed under a pressure of 40 N, cooled at a rate of 3°C / min by water cooling, reacted with moisture at a relative humidity of 60% RH for 15 seconds, and cured for 24 hours to obtain a pretreated plain cloth 1;

[0074] S3. Unwind a 50D polyurethane sponge sheet with a thickness of 0.2 cm, and apply the PUR hot melt adhesive A to one side of the polyurethane sponge sheet by dot coating using a dot roller at a temperature of 90°C and a speed of 40 m / min. The open time of the PUR hot melt adhesive A is 30 s, and the coating density is 10 g / m 2 , the coating thickness is 40 μm, and then it is laminated with one side of the PTFE film of the pre-treated plain cloth 1, pressed under a pressure of 40 N, cooled at a rate of 3°C / min by water cooling, and moisture reacted for 15 seconds at a relative humidity of 60% RH, and cured for 24 hours to obtain the pre-treated plain cloth 2;

[0075] S4. Unwind a 0.3 cm thick knitted weft-knitted three-dimensional spacer fabric (commercially available) made of polyester fiber, and coat one side of the fabric with PUR hot melt adhesive B (viscosity of 5250±750cps at 110°C, commercially available) using a diamond anilox roller at a temperature of 110°C and a speed of 40m / min. The open time of PUR hot melt adhesive B is 45s, and the coating density is 10g / m 2 , the coating thickness is 40 μm, and then it is laminated with the polyurethane sponge flakes of the pre-treated plain cloth 2, pressed under a pressure of 40 N, cooled at a rate of 3 ° C / min by water cooling, and reacted with moisture for 15 seconds at a relative humidity of 60% RH, and cured for 24 hours to obtain the pre-treated plain cloth 3;

[0076] S5. 40S cotton yarn and 50D T800 high elastic polyester DTY yarn are made in a mass ratio of 73.6:26.4 to produce a yarn with a density of 29 needles / inch and a gram weight of 170g / m 2 The knitted fabric (commercially available) was unwound, and the PUR hot melt adhesive B was coated on one side of the knitted fabric using a diamond anilox roller at a temperature of 110°C and a speed of 40 m / min. The open time of the PUR hot melt adhesive B was 45 s, and the coating density was 10 g / m 2 , the coating thickness is 40 μm, and then it is laminated with the knitted weft-knitted three-dimensional spacer fabric of the pre-treated plain cloth 3, pressed under a pressure of 40 N, cooled at a rate of 3°C / min by water cooling, and reacted with moisture for 15 seconds at a relative humidity of 60% RH, and cured for 24 hours to obtain the pre-treated plain cloth 4;

[0077] S6. The pretreated plain cloth 4 is cut and placed in a mold, and pressed for 48 hours at a temperature of 180°C and a pressure of 0.3Mpa to form a number of evenly distributed concave portions with a depth of 40μm. All the concave portions are interconnected to obtain a composite fabric (such as Figure 1 and Figure 2 shown).

[0078] Example 2

[0079] A method for preparing a composite fabric, the specific steps are as follows:

[0080] S1. The surface layer (i.e., the layer opposite to the bottom surface) of a 50D 100% polyester weft knitted single-sided plain fabric (bottom surface brushed, commercially available) was coated with the above-mentioned PUR hot melt adhesive A (commercially available) by a dot coating method at a temperature of 100°C and a speed of 60m / min. The open time of the PUR hot melt adhesive A was 15s and the coating density was 10g / m 2 , coating thickness is 40μm;

[0081] S2. Then, a PTFE membrane having an average pore size of 5 μm and a thickness of 5-15 μm was corona treated to obtain a pretreated PTFE membrane; the pretreated PTFE membrane was laminated to the side of the above-mentioned plain cloth coated with PUR hot melt adhesive, pressed under a pressure of 60 N, cooled at a rate of 5 ° C / min by water cooling, and moisture reacted at a relative humidity of 70% RH for 45 seconds, and cured for 24 hours to obtain a pretreated plain cloth 1;

[0082] S3. Then, a 50D polyurethane sponge flake with a thickness of 0.2 cm was unrolled, and one side of the polyurethane sponge flake was coated with the above-mentioned PUR hot melt adhesive A (commercially available) by a dot coating method using a dot roller at a temperature of 100°C and a speed of 60 m / min. The open time of the PUR hot melt adhesive A was 15 s, and the coating density was 20 g / m 2 , the coating thickness is 40 μm, and then it is laminated with the PTFE film of the pre-treated plain cloth 1, pressed under a pressure of 60 N, cooled at a rate of 5 ° C / min by water cooling, and moisture reacted for 45 seconds at a relative humidity of 70% RH, and cured for 24 hours to obtain the pre-treated plain cloth 2;

[0083] S4. Unwind a knitted weft-knitted three-dimensional spacer fabric made of polyester fiber with a thickness of 0.3 cm, and apply the above-mentioned PUR hot melt adhesive B (commercially available) to one side of the fabric using a diamond anilox roller at a temperature of 120°C and a speed of 60 m / min. The open time of PUR hot melt adhesive B is 25 s, and the coating density is 20 g / m 2, the coating thickness is 40 μm, and then it is laminated with the polyurethane sponge flakes of the pre-treated plain cloth 2, pressed under a pressure of 60 N, cooled at a rate of 5 ° C / min by water cooling, and moisture reacted for 45 seconds at a relative humidity of 70% RH, and cured for 24 hours to obtain the pre-treated plain cloth 3;

[0084] S5. 75D / 72F DTY yarn and 30D spandex are made in a mass ratio of 88:12 to have a density of 32 needles / inch and a gram weight of 230g / m 2 The polyester-polyurethane double-faced fleece knitted fabric (commercially available) was unwound, and the PUR hot melt adhesive B (commercially available) was coated on one side of the knitted fabric using a diamond anilox roller at a temperature of 120°C and a speed of 60 m / min. The open time of the PUR hot melt adhesive B was 25 s, and the coating density was 20 g / m 2 , the coating thickness is 40 μm, and then it is laminated with the knitted weft-knitted three-dimensional spacer fabric of the pre-treated plain cloth 3, pressed under a pressure of 60 N, cooled at a rate of 5 ° C / min by water cooling, and reacted with moisture for 45 seconds at a relative humidity of 70% RH, and cured for 24 hours to obtain the pre-treated plain cloth 4;

[0085] S6. The pretreated plain cloth 4 is cut, placed in a mold, and pressed at a temperature of 180°C and a pressure of 0.5 MPa for 24 hours to form a number of evenly distributed concave portions with a depth of 60 μm. All the concave portions are interconnected to obtain a composite fabric.

[0086] Example 3

[0087] In addition to directly mixing the polyurethane sponge flakes of the pre-treated plain cloth 2 with 40S cotton yarn and 50D T800 high elastic polyester DTY yarn in a mass ratio of 73.6:26.4 to form a spunbond having a density of 29 needles / inch and a gram weight of 170g / m 2 In addition to being compounded with a knitted fabric (commercially available), a composite fabric is prepared in the same manner as in Example 1, that is, the difference between this embodiment and Example 1 is that it does not include a knitted weft-knitted three-dimensional spacer fabric layer.

[0088] Example 4

[0089] The composite fabric was prepared in the same manner as in Example 1 except for the following conditions:

[0090] S6. trimming the pretreated plain fabric 4 to obtain a composite fabric.

[0091] That is, the difference between this embodiment and embodiment 1 is that no hot pressing is performed.

[0092] Comparative Example 1

[0093] The composite fabric was prepared in the same manner as in Example 1, except that a TPU membrane having an average pore size of 5 μm and a thickness of 5-8 μm was used instead of the polytetrafluoroethylene membrane.

[0094] Comparative Example 2

[0095] The composite fabric was prepared in the same manner as in Example 1, except that EVA hot melt adhesive A with a viscosity of 4200±800cps at 90°C was used instead of PUR hot melt adhesive A, and EVA hot melt adhesive B with a viscosity of 5250±750cps at 110°C was used instead of PUR hot melt adhesive B.

[0096] Comparative Example 3

[0097] The composite fabric was prepared in the same manner as in Example 1, except that the thickness of the PTFE membrane was 15-20 μm.

[0098] Comparative Example 4

[0099] The composite fabric was prepared in the same manner as in Example 1 except that the thickness of the PTFE membrane was 3-5 μm.

[0100] Comparative Example 5

[0101] The composite fabric was prepared in the same manner as in Example 1 except that the pore size of the PTFE membrane was 2-3 μm.

[0102] Comparative Example 6

[0103] The composite fabric was prepared in the same manner as in Example 1 except that the pore size of the PTFE membrane was 20-25 μm.

[0104] Comparative Example 7

[0105] Except for the coating density of PUR hot melt adhesive A in step S1 and step S2 being 15 / m 2 In addition, the composite fabric was prepared in the same manner as in Example 1.

[0106] Comparative Example 8

[0107] Except for the coating density of PUR hot melt adhesive A in step S1 and step S2 being 4 g / m 2 In addition, the composite fabric was prepared in the same manner as in Example 1.

[0108] Comparative Example 9

[0109] Except for the coating density of PUR hot melt adhesive B in step S3 and step S4 being 22 g / m 2 In addition, the composite fabric was prepared in the same manner as in Example 1.

[0110] Comparative Example 10

[0111] Except for the coating density of PUR hot melt adhesive B in step S3 and step S4 being 9 g / m 2 In addition, the composite fabric was prepared in the same manner as in Example 1.

[0112] Comparative Example 11

[0113] The composite fabric was prepared in the same manner as in Example 1, except that the coating temperature of the PUR hot melt adhesive A in step S1 and step S2 was 85°C.

[0114] Comparative Example 12

[0115] The composite fabric was prepared in the same manner as in Example 1, except that the coating temperature of the PUR hot melt adhesive A in step S1 and step S2 was 105°C.

[0116] Comparative Example 13

[0117] The composite fabric was prepared in the same manner as in Example 1 except that the coating speed was 38 m / min.

[0118] Comparative Example 14

[0119] The composite fabric was prepared in the same manner as in Example 1 except that the coating speed was 65 m / min.

[0120] Comparative Example 15

[0121] The composite fabric was prepared in the same manner as in Example 1 except that the cooling rate was 2° C. / min.

[0122] Comparative Example 16

[0123] The composite fabric was prepared in the same manner as in Example 1 except that the cooling rate was 6° C. / min.

[0124] Comparative Example 17

[0125] The composite fabric was prepared in the same manner as in Example 1 except that the relative humidity of the moisture reaction was 55% RH.

[0126] Comparative Example 18

[0127] The composite fabric was prepared in the same manner as in Example 1 except that the relative humidity of the moisture reaction was 75% RH.

[0128] Performance Testing

[0129] The waterproof properties of the composite fabrics prepared in Examples 1-4 and Comparative Examples 1-18 were tested in accordance with "GB / T 4744-2013 Testing and Evaluation of Waterproof Properties of Textiles - Hydrostatic Pressure Method", and the results are shown in Table 1;

[0130] The air permeability of the composite fabrics prepared in Examples 1-4 and Comparative Examples 1-18 was tested according to GB / T 5453-1997 Determination of Air Permeability of Textile Fabrics (the sample area was 20 cm 2 , pressure drop is 100Pa), the results are shown in Table 1;

[0131] The moisture resistance of the composite fabrics prepared in Examples 1-4 and Comparative Examples 1-18 was tested in accordance with GB / T 11048-2018 Determination of thermal resistance and moisture resistance of textiles under steady-state conditions for physiological comfort (evaporative hot plate method), and the results are shown in Table 1.

[0132] Table 1 Test results

[0133] Group Waterproof performance, kPa Air permeability, mm / s <![CDATA[Moisture resistance, m 2 ·Pa / W]]> Example 1 119.9 5.9 11.6 Example 2 108.5 8.9 10.2 Example 3 100.0 4.9 13.8 Example 4 95.2 5.2 16.8 Comparative Example 1 156.1 Not detected Not detected Comparative Example 2 83.6 3.1 20.5 Comparative Example 3 70.9 5.1 21.3 Comparative Example 4 81.5 2.4 26.1 Comparative Example 5 83.7 2.3 25.8 Comparative Example 6 90.2 1.1 30 Comparative Example 7 120.3 1.5 23.8 Comparative Example 8 103.6 7.6 10.3 Comparative Example 9 125.6 0.7 26.9 Comparative Example 10 95.8 7.4 10.4 Comparative Example 11 130.9 0.6 31.8 Comparative Example 12 125.3 6.2 20 Comparative Example 13 99.9 2.1 22.9 Comparative Example 14 89.6 2.0 25.4 Comparative Example 15 109 2.8 24.9 Comparative Example 16 100.5 1.6 20.9 Comparative Example 17 103.6 1.9 21.6 Comparative Example 18 107.9 1.7 22.5

[0134] As shown in Table 1, the air permeability and moisture resistance of the composite fabric of Comparative Example 1 (using a TPU film with an average pore size of 5 μm and a thickness of 5-8 μm to replace the polytetrafluoroethylene film) were not detected, while the air permeability of the composite fabric of Example 1 was 5.9 mm / s and the moisture resistance was 11.6 m / s. 2 ·Pa / W. The results show that the present application selects a polytetrafluoroethylene film or a film formed by modified polytetrafluoroethylene with waterproof, moisture permeability and air permeability as the material of the film layer, and the first fabric layer and the film layer, as well as the film layer and the comfort layer, are compounded by adhesive point-shaped hot-melt bonding, thereby avoiding the technical problem of poor air permeability and poor moisture permeability caused by the adhesive covering the contact surface between the film layer and the adjacent layer during the compounding process, thereby making the composite fabric have both air permeability, waterproofness and moisture permeability, and improving the comfort of the composite fabric.

[0135] As can be seen from Table 1, compared with Example 3 (excluding the knitted weft-knitted three-dimensional spacer fabric layer), the air permeability of the composite fabric of Example 1 is significantly improved. This result shows that the present application can improve the air permeability of the composite fabric by forming a spacer fabric layer between the comfort layer and the second fabric layer, thereby improving the comfort of the composite fabric.

[0136] As shown in Table 1, compared with Example 4 (without hot pressing), the air permeability of the composite fabric of Example 1 is significantly improved and the moisture resistance is significantly reduced. This result shows that by adding a hot pressing step after the last curing and curing, the present application can form a number of concave portions on the surface of the composite fabric, and form a moisture permeable channel between all the concave portions to facilitate the flow of heat and non-evaporative sweat, thereby improving the air permeability and moisture permeability of the composite fabric.

[0137] As can be seen from Table 1, compared with Comparative Example 2 (using EVA hot melt adhesive instead of PUR hot melt adhesive), the waterproof performance and air permeability of the composite fabric of Example 1 are significantly improved, and the moisture resistance is significantly reduced. This result shows that the application uses low modulus, high elasticity moisture curing reactive polyurethane hot melt adhesive (i.e., PUR hot melt adhesive) as the adhesive in the composite process, and combines the point hot melt composite technology to ensure the bonding effect between the film layer and the adjacent layer while improving flexibility and comfort, avoiding the technical problems of poor air permeability and poor moisture permeability caused by the contact surface between the covering film layer and the adjacent layer during the composite process, thereby improving the air permeability and moisture permeability of the composite fabric.

[0138] As can be seen from Table 1, compared with Comparative Examples 3-6 (the thickness and pore size of the PTFE membrane are not within the range of 5-15 μm), the air permeability of the composite fabric of Example 1 is significantly improved and the moisture resistance is significantly reduced. The results show that the present application selects a membrane with a specific pore size and thickness (the pore size of the membrane is 5-15 μm, and the thickness of the membrane is 5-15 μm), and the first fabric layer, the membrane layer, the comfort layer and the second fabric layer are sequentially hot-melt-bonded by an adhesive along the thickness direction to form a composite fabric, thereby avoiding the technical problem of poor air permeability and poor moisture permeability caused by the adhesive covering the contact surface between the membrane layer and the adjacent layers during the bonding process, thereby further improving the air permeability and moisture permeability of the composite fabric.

[0139] As shown in Table 1, compared with Comparative Examples 7-10 (coating density is not within the above specific range), Comparative Examples 11-12 (coating temperature is not within the above specific range) and Comparative Examples 13-14 (coating speed is not within the above specific range), the composite fabric of Example 1 has significantly improved waterproof performance or air permeability, or significantly reduced moisture resistance. The present application controls the coating density, coating speed, coating thickness, coating temperature and other parameters of the adhesive within a specific range, thereby ensuring the bonding effect while avoiding the problem of poor air permeability and poor moisture permeability caused by the adhesive covering the contact surface during the composite process, improving the air permeability and moisture permeability of the composite fabric, and thus making the composite fabric have both waterproof performance, air permeability and moisture permeability.

[0140] As shown in Table 1, compared with Comparative Examples 15-16 (the cooling rate is not within the above-mentioned specific range), the air permeability of the composite fabric of Example 1 is significantly improved and the moisture resistance is significantly reduced. This result shows that the present application can prevent uneven adhesive layer or bubbles by controlling the cooling rate within a specific range, ensure the flatness of the composite fabric, avoid the adverse effects on air permeability and moisture permeability caused by bubbles or uneven adhesive layer, and thus improve the air permeability and moisture permeability of the fabric.

[0141] As shown in Table 1, compared with Comparative Examples 17-18 (the cooling rate is not within the above-mentioned specific range), the composite fabric of Example 1 has significantly improved air permeability and significantly reduced moisture resistance. The results show that controlling the relative humidity of the moisture reaction within a specific range can ensure the bonding effect while avoiding the problem of poor air permeability and poor moisture permeability caused by the adhesive covering the contact surfaces of each layer during the composite process, thereby improving the air permeability and moisture permeability of the composite fabric.

[0142] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A composite fabric, characterized in that: The composite fabric is formed by compounding a first fabric layer, a film layer, a comfort layer and a second fabric layer in sequence along the thickness direction through adhesives. The first fabric layer and the film layer, as well as the film layer and the comfort layer, are compounded by point hot melt. The material of the film layer is a polytetrafluoroethylene film or a film formed by modified polytetrafluoroethylene.

2. The composite fabric according to claim 1, characterized in that: The material of the first fabric layer is a non-slip fabric, a knitted fabric or a brushed fabric formed by at least one of natural fibers, polyester fibers and polyurethane fibers; And / or, the pore size of the polytetrafluoroethylene membrane or the membrane formed by modified polytetrafluoroethylene is 5-15 μm; And / or, the thickness of the film layer is 5-15 μm; And / or, the material of the comfort layer is sponge, fiber felt, foam or silicone cotton; And / or, the thickness of the comfort layer is 0.1-0.3 cm; And / or, the material of the second fabric layer is woven fabric, knitted fabric or brushed fabric formed by at least one of natural fiber and polyester fiber.

3. The composite fabric according to claim 1, characterized in that: The adhesive between the first fabric layer and the film layer and between the film layer and the comfort layer is selected from a first adhesive, and the first adhesive is selected from a moisture-curing reactive polyurethane hot melt adhesive with a viscosity of 3400-5000 cps at a temperature of 90° C.; And / or, the surface density of the adhesive between the first fabric layer and the film layer and between the film layer and the comfort layer is 5-10 g / m 2 ; And / or, the surface density of the adhesive in the adhesive area between the comfort layer and the second fabric layer is 10-20 g / m 2 ; And / or, the thickness of the adhesive is 20-50 μm; And / or, the comfort layer and the second fabric are formed by mesh hot-melt bonding; And / or, the adhesive between the comfort layer and the second fabric is selected from a second adhesive, and the second adhesive is selected from a moisture-curing reactive polyurethane hot melt adhesive having a viscosity of 4500-6000 cps at a temperature of 110° C.; And / or, further comprising a spacer fabric layer, wherein the spacer fabric layer is located between the comfort layer and the second fabric layer; And / or, the second fabric layer is provided with a plurality of recesses, and all the recesses are interconnected.

4. The composite fabric according to claim 3, characterized in that: The material of the spacer fabric layer is a spacer fabric formed by at least one of natural fiber and polyester fiber; And / or, the thickness of the spacer fabric layer is 0.2-0.4 cm; And / or, the depth of the recess is 40-60 μm.

5. The composite fabric according to claim 3, characterized in that: The spacer fabric layer and the comfort layer as well as the spacer fabric layer and the second fabric are both formed by hot-melt web bonding of the second adhesive.

6. The composite fabric according to claim 3, characterized in that: The surface density of the adhesive in the adhesive area between the spacer fabric layer and the comfort layer and between the spacer fabric layer and the second fabric layer is 10-20 g / m 2 .

7. The method for preparing the composite fabric according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: The first fabric layer is bonded to the membrane layer by the adhesive, pressed, cooled, reacted with moisture, and cured, then bonded to the comfort layer, pressed, cooled, reacted with moisture, and cured, and then bonded to the second fabric layer, pressed, cooled, reacted with moisture, and cured to obtain the composite fabric.

8. The preparation method according to claim 7, characterized in that: The coating speed of the adhesive is 40-60m / min; And / or, the pressing pressure is 40-60N; And / or, the cooling rate is 3-5°C / min; And / or, the relative humidity of the moisture reaction is 60%RH-70%RH; And / or, the duration of the moisture reaction is 15-45s; And / or, after the last aging and curing, the method further comprises the following steps: hot pressing to form a plurality of recesses, all of which are interconnected.

9. The preparation method according to claim 8, characterized in that: The temperature of the hot pressing is 180-220° C., the pressure of the hot pressing is 0.3-0.5 MPa, and the duration of the hot pressing is 24-48 hours.

10. A textile, characterized in that: The textile is made of the composite fabric according to any one of claims 1 to 6 or a composite fabric prepared according to the method according to any one of claims 7 to 9.

Images