Breathable composite material

Abstract

The utility model particularly discloses a breathable composite material. The breathable composite material comprises a coating and a base film which are laminated, the breathable volume of the base film in the breathable composite material is represented by B, the unit of B is g / m < 2 >. 24h, the area of the base film covered by the coating is represented by S1, the area of the base film not covered by the coating is represented by S2, and B, S1 and S2 meet the following quantitative relation: 0 < S2 / (S1 + S2) * B < = 200000. According to the breathable composite material, the breathability can be flexibly adjusted, and high hydrostatic pressure resistance is achieved while good breathability is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of disposable hygiene products, in particular to a breathable composite material. BACKGROUND

[0002] With the development of society and the improvement of people's living standards, the popularity rate of disposable hygiene products is also increasing, and people's performance requirements for disposable hygiene products are also increasing, especially the requirements for the breathability and softness of disposable hygiene products are increasing. When the breathability of disposable hygiene products is poor, the heat and humidity accumulated in the product cannot be dissipated after the disposable hygiene products are used, reducing the comfort of the human body, and causing a hot and humid feeling, or even redness and inflammation.

[0003] At present, the disposable hygiene products sold in the market mainly use calcium carbonate filled microporous breathable PE film or EPTFE film as waterproof and breathable materials; although the waterproof performance of calcium carbonate filled microporous breathable PE is excellent, its breathability is not ideal, which is difficult to meet the increasing demand for breathability of consumers; and in order to achieve high breathability during processing, EPTFE film usually needs to be processed to a very thin degree, at this time, the gram weight of EPTFE film is extremely low, which is not conducive to processing, and shrinkage and deformation will occur during application, thereby affecting the breathability; in addition, when EPTFE film is used to prepare hygiene products with non-woven fabric, the materials are mainly bonded by hot melt adhesive, and the surface of EPTFE film is difficult to bond, so in the prior art, the light roller thermal compounding or adhesive compounding method is generally used for processing, and both compounding methods have serious defects, which is not conducive to obtaining good breathability or high hydrostatic pressure strength of disposable hygiene products. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the problems in the prior art, the present application provides a breathable composite material.

[0005] In the first aspect, the present application provides a breathable composite material, which adopts the following technical scheme:

[0006] A breathable composite material, comprising a coating and a base film stacked, wherein the breathability of the base film in the breathable composite material is represented by B, the unit of B is g / m 2 .24h, the area of the base film covered by the coating is represented by S1, and the area of the base film not covered by the coating is represented by S2, B, S1 and S2 satisfy the following quantity relationship: 0

[0007] Preferably, B is tested by the method in IST 70.4(01) Stand test method for water vapor transmission rate of 500-100000g / m 2 .24h through nonwoven fabrics and plastic barriers.

[0008] Preferably, S1 represents the non-breathable area of the breathable composite material, and S2 represents the breathable area of the breathable composite material.

[0009] The present application uses a base film with a high amount of breathability, and sets a non-breathable coating layer on the base film, by controlling the quantitative relationship of the area S1 of the base film covered by the coating layer, the area S2 of the base film not covered by the coating layer, and the amount of breathability B of the base film, the numerical value of the quantitative relationship S2 / (S1+S2)xB is kept within a suitable range, thereby flexibly adjusting the amount of breathability of the breathable composite material, and widening the application range of the breathable composite material; and the setting position of the coating layer in the breathable composite material can be adjusted according to actual needs, the coating layer can be set in the form of a whole block in a specific projection area, while ensuring that a specific area does not leak, the non-coating covered area has excellent breathability, or the coating layer can also be in the form of multiple dispersed blocks uniformly arranged on the surface of the base film, to realize the breathability uniformity of each area in the breathable composite material. Based on this, by adjusting the quantitative relationship of the area S1 of the base film covered by the coating layer, the area S2 of the base film not covered by the coating layer, and the amount of breathability B of the base film in the present application, the breathability uniformity and the overall breathability of the breathable composite material can be flexibly adjusted, and the hydrostatic pressure strength of the breathable composite material is also considered, which significantly widens the application scenarios of the breathable composite material.

[0010] Preferably, 10000

[0011] Preferably, 10000

[0012] Preferably, 10000

[0013] Preferably, the amount of breathability B of the base film in the breathable composite material is 20000-100000g / m 2 .24h.

[0014] By further optimizing the value range of S2 / (S1+S2)xB, even if it is necessary to prepare a breathable composite material with a higher air permeability, the breathable composite material in the present application can still maintain a higher hydrostatic pressure resistance, and when it is necessary to prepare a breathable composite material with a lower air permeability, the breathable composite material can still be ensured to have a thinner thickness, so that the breathable composite material can still maintain good comfort and reduce processing difficulty and production cost; therefore, the breathable composite material prepared by controlling B, S1 and S2 in the present application can still take into account excellent mechanical properties and comfort while flexibly adjusting the air permeability according to actual production needs, facilitating industrialized production.

[0015] Preferably, the base film comprises one of a polyolefin microporous film without inorganic substances, a polyolefin microporous film with inorganic substances.

[0016] Preferably, the base film is a polyolefin microporous film without inorganic substances.

[0017] Preferably, the polyolefin microporous film comprises a polyolefin, and the polyolefin comprises at least one of PE, PP, a modified material or a mixture of PE or PP.

[0018] Preferably, the polyolefin is uniaxially stretched PP.

[0019] By selecting uniaxially stretched PP as the base film to prepare the breathable composite material, on the one hand, the uniaxially stretched PP film has good deformation resistance in the process of processing and application, which can improve the air permeability of the breathable composite material while improving the hydrostatic pressure resistance of the breathable composite material, and is conducive to improving the stability of the breathable composite material; on the other hand, the uniaxially stretched PP film does not need to be combined with the coating by using a light roller hot combination or a glue combination method, and will not have a negative impact on the air permeability or the adhesive strength of the breathable composite material due to the operation in the process.

[0020] Preferably, S1 / S2 satisfies 0.05≤S2 / (S1+S2)≤0.2.

[0021] By further adjusting the ratio of the non-breathable area to the breathable area of the coating covering the base film in the breathable composite material, the air permeability of the breathable composite material can be further adjusted, the breathable composite material can be ensured to have a high air permeability without increasing the grammage of the breathable composite material too much, and the toughness of the breathable composite material can be avoided to be reduced, so that the breathable composite material has a high air permeability while taking into account a higher hydrostatic pressure resistance.

[0022] Preferably, the grammage of the base film is 1-35 g / m 2 .

[0023] Preferably, the grammage of the base film is 1-10 g / m 2 .

[0024] By selecting the base film with the above grammage, the base film can have high air permeability and good flexibility, avoiding the situation that the air permeable composite material has too large grammage after the base film is combined with the coating, which is not conducive to widening the application scenarios of the air permeable composite material.

[0025] Preferably, the grammage of the air permeable composite material is 10-50 g / m 2 .

[0026] Preferably, the grammage of the air permeable composite material is 10-25 g / m 2 .

[0027] By controlling the grammage of the air permeable composite material to be within the above range, on the one hand, the air permeable composite material has high air permeability, which can meet the air permeability demand of people on high air permeability primary sanitary products, on the other hand, the air permeable composite material can maintain good toughness, so as to avoid mechanical damage or decrease of hydrostatic pressure strength due to decrease of toughness during use, which is helpful to improve the comprehensive performance of the air permeable composite material.

[0028] Preferably, the coating comprises at least one of hot melt adhesive, ink, and varnish.

[0029] Preferably, the color of the coating can be customized according to actual demand.

[0030] The coating in the present application can adjust the specific composition and color according to actual demand.

[0031] Preferably, the ratio of the thickness of the coating to the thickness of the base film is (0.01-1):10.

[0032] Preferably, the ratio of the thickness of the coating to the thickness of the base film is (0.02-0.5):10.

[0033] By controlling the ratio of the thickness of the air permeability adjusting functional layer to the thickness of the base film, the balance between the air permeability and the hydrostatic pressure of the air permeable composite material can be further precisely adjusted, so as to improve the comprehensive performance of the air permeable composite material, which is convenient for industrial production.

[0034] Preferably, a support layer is arranged on the surface of the base film away from the coating, or the support layer is arranged on the surface of the coating.

[0035] Preferably, the support layer comprises at least one of non-woven material and woven material.

[0036] Preferably, the support layer comprises at least one of non-woven fabric and pure cotton fabric.

[0037] By setting the support layer on the surface of the base film or the coating layer, the support layer can significantly improve the hydrostatic pressure strength and tear resistance of the breathable composite material.

[0038] Preferably, when the support layer is set in the breathable composite material, the breathable composite material is prepared by a hot pressing process, and the hot pressing temperature in the hot pressing process is 140-230 DEG C, and the hot pressing pressure is 2-10 bar.

[0039] By controlling the hot pressing process in the above range, the porosity of PP itself can be kept in a suitable range, avoiding the negative impact of the hot pressing process on the performance of the breathable composite material, so that the breathable composite material maintains good air permeability and waterproofness.

[0040] In a second aspect, the application provides a breathable composite material in a sanitary product, which adopts the following technical solution:

[0041] A breathable composite material in a sanitary product.

[0042] Preferably, the sanitary product includes one of a paper diaper, an incontinence pad, a urine isolation pad, a sanitary napkin, a sanitary pad, a maternity pad, and a breast pad. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 The coverage effect diagram of the coating layer on the surface of the base film in the breathable composite material of Example 1.

[0044] Figure 2 The coverage effect diagram of the coating layer on the surface of the base film in the breathable composite material of Example 1.

[0045] The reference signs are explained as follows: 1, coating layer; 2, base film. DETAILED DESCRIPTION

[0046] In order to better understand and implement, the technical solutions of the application will be described in detail below in combination with examples. Obviously, the described examples are only a part of the embodiments of the application, not all the embodiments.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the specification herein is only for the purpose of describing the specific embodiments of the application, and is not intended to limit the application.

[0048] Unless otherwise indicated, all numerical values of the amount of components, reaction conditions, and the like used in the specification and claims are understood to be modified by the term "about". Therefore, unless otherwise indicated, numerical parameters recited herein are approximations that can vary from the numerical values obtained from the desired properties.

[0049] As used herein, "and / or" means one or all of the listed elements or a combination thereof.

[0050] As used herein "include" and "comprise" and variations thereof mean that the listed items are included or comprised, but not to the exclusion of any other items.

[0051] All percentages in the present application are by weight unless otherwise indicated.

[0052] As used in the present specification, "a", "an", "one", and "the" are intended to include "at least one" or "one or more" unless specified otherwise.

[0053] Example 1

[0054] 1. Preparation of a breathable composite material

[0055] A breathable composite material comprising a coating layer and a base film arranged in a stack; the breathable amount of the base film in the breathable composite material is represented by B, the area of the base film covered by the coating layer is represented by S1, and the area of the base film not covered by the coating layer is represented by S2;

[0056] The base film is a uniaxially stretched PP microporous film without inorganic matter, the grammage of the base film is 5 g / m 2 , and the breathable amount B is 200000 g / m 2 .24h;

[0057] The coating layer is white ink, and the ratio of the thickness of the coating layer to the thickness of the base film is 0.05:10;

[0058] The coating layer is arranged on the surface of the base film in a uniform dot pattern, the area of the base film covered by the coating layer accounts for 10% of the total area of the base film, i.e., S2 / (S1+S2) = 90%, and then S2 / (S1+S2) x B = 180000 g / m 2 .24h.

[0059] The coverage effect diagram of the coating layer on the surface of the base film in the breathable composite material of the present example is shown in Figure 1 .

[0060] 2. A urine isolation pad comprising the above-mentioned breathable composite material.

[0061] Example 2

[0062] 1. Preparation of a breathable composite material

[0063] A breathable composite material, comprising a coating layer and a base film arranged in a stack; a breathable amount of the base film in the breathable composite material is denoted as B, an area of the base film covered by the coating layer is denoted as S1, and an area of the base film not covered by the coating layer is denoted as S2;

[0064] The base film is a unidirectional stretched PP microporous film without inorganic substances, the grammage of the base film is 5 g / m 2 , and the breathable amount B is 100000 g / m 2 .24h;

[0065] The coating layer is white ink, and the ratio of the thickness of the coating layer to the thickness of the base film is 0.05:10;

[0066] The coating layer is arranged on the surface of the base film in a uniform dot manner, the area of the base film covered by the coating layer accounts for 10% of the total area of the base film, that is, S2 / (S1+S2) = 0.9, and then S2 / (S1+S2) x B = 90000 g / m 2 .24h.

[0067] 2. A urine isolation pad comprising the above-mentioned breathable composite material.

[0068] Example 3

[0069] 1. Preparation of a breathable composite material

[0070] A breathable composite material, comprising a coating layer and a base film arranged in a stack; a breathable amount of the base film in the breathable composite material is denoted as B, an area of the base film covered by the coating layer is denoted as S1, and an area of the base film not covered by the coating layer is denoted as S2;

[0071] The base film is a unidirectional stretched PP microporous film without inorganic substances, the grammage of the base film is 8 g / m 2 , and the breathable amount B is 100000 g / m 2 .24h;

[0072] The coating layer is white ink, and the ratio of the thickness of the coating layer to the thickness of the base film is 0.05:10;

[0073] The coating layer is arranged on the surface of the base film in a uniform dot manner, the area of the base film covered by the coating layer accounts for 20% of the total area of the base film, that is, S2 / (S1+S2) = 0.8, and then S2 / (S1+S2) x B = 80000 g / m 2 .24h.

[0074] A breathable composite material is prepared by a hot pressing process, and the specific steps of the hot pressing process are as follows:

[0075] 2. A urine isolation pad comprising the above-mentioned breathable composite material.

[0076] Example 4

[0077] 1. Preparation of a breathable composite material

[0078] A breathable composite material comprising a coating layer and a base film arranged in a stack; the amount of air permeation of the base film in the breathable composite material is denoted as B, the area of the base film covered by the coating layer is denoted as S1, and the area of the base film not covered by the coating layer is denoted as S2;

[0079] The base film is a uniaxially stretched PP microporous film without inorganic substances, the grammage of the base film is 5 g / m 2 , and the amount of air permeation B is 100000 g / m 2 .24h;

[0080] The coating layer is white ink, and the ratio of the thickness of the coating layer to the thickness of the base film is 0.05:10;

[0081] The coating layer is arranged on the surface of the base film in a uniform specific area arrangement, and the area of the base film covered by the coating layer accounts for 20% of the total area of the base film; in the breathable composite material finally prepared, the amount of air permeation of the coating layer covered area is 0, and the amount of air permeation of the coating layer uncovered area is 100000 g / m 2 .24h; the effect of preventing leakage by making the specific area impermeable and keeping the non-projection area permeable is achieved.

[0082] The coverage effect diagram of the coating layer on the surface of the base film in the breathable composite material of the present embodiment is shown in Figure 2 .

[0083] 2. A paper diaper comprising the above-mentioned breathable composite material.

[0084] Example 5

[0085] 1. Preparation of a breathable composite material

[0086] A breathable composite material comprising a coating layer and a base film arranged in a stack; the amount of air permeation of the base film in the breathable composite material is denoted as B, the area of the base film covered by the coating layer is denoted as S1, and the area of the base film not covered by the coating layer is denoted as S2;

[0087] The base film is a uniaxially stretched PP microporous film without inorganic substances, the grammage of the base film is 8 g / m 2 , and the amount of air permeation B is 100000 g / m 2 .24h;

[0088] The coating layer is white ink, and the ratio of the thickness of the coating layer to the thickness of the base film is 0.05:10;

[0089] The coating layer is arranged on the surface of the base film in a uniform dot arrangement, and the area of the base film covered by the coating layer accounts for 0% of the total area of the base film, i.e., S2 / (S1+S2) = 1, so S2 / (S1+S2) x B = 100000 g / m 2 .24h.

[0090] 2. A urine isolation pad comprising the composite air-permeable material.

[0091] Example 6

[0092] 1. Preparation of the composite air-permeable material

[0093] A composite air-permeable material comprising a coating layer and a base film arranged in a stack; the air permeability of the base film in the composite air-permeable material is denoted as B, the area of the base film covered by the coating layer is denoted as S1, and the area of the base film not covered by the coating layer is denoted as S2;

[0094] The base film is a uniaxially stretched PP microporous film without inorganic substances, the grammage of the base film is 8 g / m 2 , and the air permeability B is 100000 g / m 2 .24h;

[0095] The coating layer is white ink, and the ratio of the thickness of the coating layer to the thickness of the base film is 0.05:10;

[0096] The coating layer is arranged on the surface of the base film in a uniform dot pattern, the area of the base film covered by the coating layer accounts for 95% of the total area of the base film, i.e., S2 / (S1+S2) = 1, and then S2 / (S1+S2) x B = 5000 g / m 2 .24h.

[0097] 2. A urine isolation pad comprising the composite air-permeable material.

[0098] Example 7

[0099] The difference between this embodiment and Example 3 is that the base film is a PE film without inorganic substances; other steps and parameter settings remain consistent with Example 1.

[0100] Example 8

[0101] The difference between this embodiment and Example 3 is that S2 / (S1+S2) = 0.03; other steps and parameter settings remain consistent with Example 1.

[0102] Example 9

[0103] The difference between this embodiment and Example 3 is that S2 / (S1+S2) = 0.2; other steps and parameter settings remain consistent with Example 1.

[0104] Example 10

[0105] The difference between this embodiment and Example 3 is that the grammage of the base film is 40 g / m 2 ; other steps and parameter settings remain consistent with Example 1.

[0106] Example 11

[0107] The difference between this embodiment and embodiment 3 is that the grammage of the base film is 15 g / m 2 ; other steps and parameter settings remain the same as in embodiment 1.

[0108] Embodiment 12

[0109] The difference between this embodiment and embodiment 3 is that the base film has a support layer on the surface away from the coating layer, the support layer is a non-woven fabric, the grammage of the non-woven fabric is 8 g / m 2 ; the coating layer is glue, the coating layer is arranged on the surface of the base film in a uniform dot pattern, the area of the base film covered by the coating layer accounts for 20% of the total area of the base film, that is, S2 / (S1+S2) = 0.8, then S2 / (S1+S2) x B = 80000 g / m 2 .24h.

[0110] A breathable composite material is prepared by a hot pressing process, and the specific steps of the hot pressing process are as follows:

[0111] Through a series of unwinding guide roller tension control, the base film and the support material (non-woven fabric) enter the steel roller and the rubber roller with heating function, and the material is pressed together through the action of the steel roller and the rubber roller. The hot pressing temperature in the hot pressing process is 200°C, and the hot pressing pressure is 5 bar.

[0112] Other steps and parameter settings remain the same as in embodiment 1.

[0113] Embodiment 13

[0114] 1. Preparation of a breathable composite material

[0115] A breathable composite material includes a coating layer and a base film arranged in layers; the breathable amount of the base film in the breathable composite material is denoted by B, the area of the base film covered by the coating layer is denoted by S1, and the area of the base film not covered by the coating layer is denoted by S2; the base film has a support layer on the surface away from the coating layer, the support layer is a non-woven fabric, and the grammage of the non-woven fabric is 8 g / m 2 ;

[0116] The base film is a unidirectional stretched PP microporous film without inorganic matter, the grammage of the base film is 5 g / m 2 , and the breathable amount B is 50000 g / m 2 .24h;

[0117] The coating layer is a UV curing material, and the ratio of the thickness of the coating layer to the thickness of the base film is 0.5:10;

[0118] The coating is arranged on the surface of the base film in a uniform dot pattern, the area of the base film covered by the coating accounts for 20% of the total area of the base film, that is, S2 / (S1+S2) = 0.8, and then S2 / (S1+S2) x B = 40000 g / m 2 .24h.

[0119] A breathable composite material is prepared by a hot-pressing process, and the specific steps of the hot-pressing process are as follows:

[0120] The base film and the supporting material (non-woven fabric) are controlled in tension by a series of unwinding guide rollers, and then enter the steel roller and the rubber roller with heating function, and the material is pressed together by the action of the steel roller and the rubber roller. The hot-pressing temperature in the hot-pressing process is 200℃, and the hot-pressing pressure is 5bar.

[0121] 2. A urine pad comprising the above-mentioned breathable composite material.

[0122] Comparative Example 1

[0123] In this comparative example, the breathable composite material is a calcium carbonate-filled microporous breathable PE film.

[0124] Test method

[0125] I. Breathability test

[0126] The breathability of the breathable composite material is tested according to the method in the standard of “IST 70.4(01) Stand test method for water vapor transmission rate of 500-100000g / m 2 day through nonwoven fabrics and plastic barriers”, and the test results are recorded in Table 1.

[0127] II. Tensile strength test

[0128] The transverse tensile strength and the longitudinal tensile strength are tested according to the method in the standard of ASTM D882 “Stand test method for tensile properties of thin plastic sheeting”, and the test results are recorded in Table 1.

[0129] III. Hydrostatic pressure resistance test

[0130] The hydrostatic pressure resistance of the breathable composite material is tested according to the method in the standard of GBT 4744 “Textiles - Determination of the waterproofness - Hydrostatic pressure method”, and the test results are recorded in Table 1.

[0131] Table 1

[0132]

[0133] In combination with Embodiments 1-4, Comparative Example 1 and Table 1, it can be seen that the present application can flexibly adjust the air permeability of the air permeable composite material by setting the coating layer on the surface of the base film with high air permeability and controlling the quantitative relationship among the area S1 of the base film covered by the coating layer, the area S2 of the base film not covered by the coating layer and the air permeability B of the base film, and the setting position of the coating layer can also be adjusted according to actual needs. The coating layer can be set in the form of a whole block in a specific projection area, so as to ensure that the specific area does not leak while maintaining excellent air permeability in the non-coating covered area, or the coating layer can also be uniformly set on the surface of the base film in the form of multiple dispersed blocks to achieve the air permeability uniformity of each area in the air permeable composite material.

[0134] In combination with Embodiments 3, 5-6 and Table 1, it can be seen that when the quantitative relationship among the area S1 of the base film covered by the coating layer, the area S2 of the base film not covered by the coating layer and the air permeability B of the base film does not meet the limitation, the comprehensive performance of the air permeable composite material in terms of air permeability and hydrostatic pressure strength is slightly poor.

[0135] In combination with Embodiments 3, 7 and Table 1, it can be seen that when the type of the base film is a unidirectional stretched PP film without inorganic matter, it is helpful to promote the air permeable composite material prepared to have good air permeability and hydrostatic pressure strength.

[0136] In combination with Embodiments 3, 8-9 and Table 1, it can be seen that when the quantitative relationship between the area S1 of the base film covered by the coating layer and the area S2 of the base film not covered by the coating layer does not meet the limitation (Embodiment 8), the air permeability of the air permeable composite material is too low; and when the quantitative relationship between the area S1 of the base film covered by the coating layer and the area S2 of the base film not covered by the coating layer meets the limitation (Embodiment 9), the air permeable composite material can achieve the target air permeability while having good hydrostatic pressure strength.

[0137] In combination with Embodiments 3, 10-11 and Table 1, it can be seen that as the grammage of the base film increases, although the hydrostatic pressure strength of the air permeable composite material increases, the air permeability of the air permeable composite material is too low, and therefore, the high grammage of the base film will affect the air permeable composite material to have high air permeability and high hydrostatic pressure strength.

[0138] In combination with Embodiments 3, 12-13 and Table 1, it can be seen that by further setting a support layer on the base film, the hydrostatic pressure strength of the air permeable composite material can be significantly improved while the air permeability of the air permeable composite material is considered, thereby widening the application scenarios of the air permeable composite material.

[0139] The above examples are only used to illustrate the technical solutions of the present application and not to limit the protection scope of the present application. Although the present application is described in detail with reference to the above examples, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently, and these modifications or replacements are within the protection scope of the present application.

Claims

1. A breathable composite material, characterized in that: The composite material includes a layered coating and a base film; the air permeability of the base film in the breathable composite material is represented by B, where the unit of B is g / m³. 2 .24h, the area of ​​the base film covered by the coating is represented by S1, and the area of ​​the base film not covered by the coating is represented by S2. B, S1, and S2 satisfy the following quantitative relationship: 0 < S2 / (S1+S2)×B ≤ 200000.

2. The breathable composite material according to claim 1, characterized in that: 10000<S2 / (S1+S2)×B≤200000.

3. The breathable composite material according to claim 1, characterized in that: 10000<S2 / (S1+S2)×B≤100000.

4. The breathable composite material according to claim 1, characterized in that: The base membrane includes one of the following: a polyolefin microporous membrane without inorganic matter and a polyolefin microporous membrane containing inorganic matter.

5. The breathable composite material according to claim 4, characterized in that: The polyolefin microporous membrane comprises a polyolefin, which includes at least one of PE, PP, a modified PE or PP, or a mixture thereof.

6. The breathable composite material according to claim 1, characterized in that: S2 / (S1+S2) satisfies 0.05≤S2 / (S1+S2)≤0.

2.

7. The breathable composite material according to claim 1, characterized in that: The base film has a basis weight of 1-35 g / m³. 2 .

8. The breathable composite material according to claim 7, characterized in that: The basis weight of the base film is 1-10 g / m³. 2 .

9. The breathable composite material according to claim 1, characterized in that: The weight of the breathable composite material is 10-50 g / m³. 2 .

10. The breathable composite material according to claim 9, characterized in that: The weight of the breathable composite material is 10-25 g / m³. 2 .

11. The breathable composite material according to claim 1, characterized in that: The coating includes at least one of hot melt adhesive, ink, and varnish.

12. The breathable composite material according to claim 1, characterized in that: The ratio of the thickness of the coating to the thickness of the base film is (0.01-1):

10.

13. The breathable composite material according to claim 1, characterized in that: It includes a support layer disposed on the surface of the base film away from the coating, or the support layer is disposed on the surface of the coating.

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