Thermal-moisture comfortable composite material resistant to bacteriophage penetration

Abstract

The present invention provides a thermal-moisture comfortable composite material resistant to bacteriophage penetration, comprising a skin-friendly layer, a moisture-permeable barrier layer, a support layer, and a moisture-permeable barrier layer which are sequentially arranged from inside to outside. The layers are bonded by means of a hot melt adhesive; the skin-friendly layer employs a hydrophilic agent-blended modified polypropylene spun-bonded non-woven fabric; the moisture-permeable barrier layer employs a polyethylene multi-stage microporous breathable membrane, comprises the raw materials comprising calcium carbonate, polyethylene, PE wax, titanium dioxide, and an antioxidant, and is prepared by means of heating and melting, extrusion, tape casting, and biaxial stretching; the support layer employs one of a polypropylene spun-bonded non-woven fabric and a polyester spun-bonded non-woven fabric. The thermal-moisture comfortable composite material resistant to bacteriophage penetration provided in the present invention allows hot and humid gas to be discharged to the external environment by means of micropores, can also resist bacteriophage penetration to protect a user from bacterial and viral infections, and thus, can be applied to the field of medical and industrial protection.

Description

Thermal and moisture comfort composite materials resistant to bacteriophage penetration Technical Field

[0001] The present invention relates to the technical field of composite materials, in particular to a thermal and moisture-comfortable composite material that is resistant to bacteriophage penetration. Background Art

[0002] Medical workers wear protective gear such as surgical gowns and isolation gowns to prevent microbial invasion during work and prevent the spread of bacteria and viruses in the blood between doctors and patients. Bacteriophages are viruses that invade bacteria and are also the genetic material that gives host bacteria their biological traits. Currently, the protective materials used on the market to block bacteriophage penetration are mainly coating materials or double-layer fabrics composed of an airtight barrier membrane and non-woven fabric. The coating is mostly made of PU, and the airtight barrier membrane is mainly EVOH. Prolonged wear can easily cause discomfort such as stuffiness. Therefore, the softness, barrier properties, and moisture permeability of medical protective fabrics need to be improved.

[0003] The prices of plastic particles are roughly ranked from high to low as EVOH>PU>EVA>PA>PC>PP>PE. By adjusting the formula and structure and using PE to replace other expensive plastics, a lot of costs can be saved for the entire protection industry.

[0004] In view of this, it is necessary to design an improved composite material to solve the above problems.

[0005] Summary of the Invention

[0006] In response to the above-mentioned defects of the prior art, the purpose of the present invention is to provide a thermal and moisture comfortable composite material that is resistant to bacteriophage penetration, which solves the problem that the barrier properties and moisture permeability of the composite materials in the prior art cannot simultaneously meet the requirements of long-term wear. This composite material meets the barrier requirements for bacteriophages while being light in weight, and at the same time has good moisture permeability, meeting the usage needs.

[0007] To achieve the above objectives, the present invention provides a thermal and moisture comfortable composite material that is resistant to bacteriophage penetration, comprising a skin-friendly layer, a moisture-permeable barrier layer, a support layer, and a moisture-permeable barrier layer arranged in sequence from the inside to the outside; the layers are bonded by hot melt adhesive.

[0008] As a further improvement of the present invention, the skin-friendly layer is made of polypropylene spunbonded non-woven fabric modified by a hydrophilic agent, with a weight of ≥12g / m 2 .

[0009] As a further improvement of the present invention, the moisture-permeable barrier layer adopts a polyethylene multi-stage microporous breathable film, and the raw materials include the following components by weight: 30-50 parts of calcium carbonate, 40-60 parts of polyethylene, 1-2 parts of PE wax, 0.5-1 part of titanium dioxide, and 0.1-0.5 part of antioxidant.

[0010] Furthermore, the calcium carbonate is wet-ground calcium carbonate with a particle size of less than 1 μm.

[0011] Furthermore, the preparation method of the moisture-permeable barrier layer is: mixing the raw materials and then heating and melting, extruding, casting, and biaxially stretching to form a polyethylene multi-stage microporous breathable film.

[0012] Furthermore, the melting temperature is 160-180° C., the extrusion temperature is 240-260° C., the casting speed is 10 m / min, and the biaxial stretching ratio is 1:(3-20).

[0013] Furthermore, the pore size of the polyethylene multi-stage microporous breathable membrane is 0.05 to 2 μm.

[0014] Furthermore, the weight of the polyethylene multi-stage microporous breathable membrane is ≥15g / m 2 .

[0015] As a further improvement of the present invention, the support layer is made of one of polypropylene spunbond non-woven fabric and polyester spunbond non-woven fabric.

[0016] Furthermore, the weight of the support layer is ≥15g / m 2 .

[0017] The beneficial effects of the present invention are:

[0018] (1) The present invention provides a thermal and humid comfortable composite material that is resistant to bacteriophage penetration. The composite material is composed of a skin-friendly layer, a moisture-permeable barrier layer, a support layer, and a moisture-permeable barrier layer that are composited together using hot melt adhesive. Hot and humid gases can be discharged to the external environment through micropores, while at the same time resisting bacteriophage penetration, protecting users from bacteria and viruses. The composite material can be used in the fields of medical and industrial protection.

[0019] (2) Existing anti-phage penetration materials are mainly coatings or airtight barrier films and non-woven fabric composite materials. Due to their extremely poor air permeability, hot and humid gases cannot be discharged, and wearing them for a long time will cause stuffiness and other discomfort. The material provided by the present invention is a multi-level microporous breathable composite material that blocks the penetration of bacteriophages while facilitating the passage of hot and humid gases.

[0020] (3) The composite material proposed by the present invention has a lower cost than the materials used in the prior art, and uses a multi-stage microporous breathable membrane to replace the coating material or the non-breathable barrier membrane and non-woven fabric composite material, which improves the price advantage and wearing comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of the structure of the thermal and moisture comfortable composite material resistant to bacteriophage penetration provided by the present invention.

[0022] Reference numerals

[0023] 1-skin-friendly layer; 2-adhesive layer; 3-moisture-permeable barrier layer; 4-support layer. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0026] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0027] The present invention provides a thermal and moisture comfortable composite material that is resistant to bacteriophage penetration, comprising a skin-friendly layer 1, a moisture-permeable barrier layer 3, a support layer 4, and a moisture-permeable barrier layer 3 arranged in sequence from the inside to the outside; the layers are bonded together by hot melt adhesive to form an adhesive layer 2, and a schematic structural diagram thereof is shown in Figure 1.

[0028] The skin-friendly layer 1 is made of polypropylene spunbonded non-woven fabric modified by a hydrophilic agent, with a weight of ≥12g / m 2 , soft to the touch and good moisture absorption.

[0029] The moisture-permeable barrier layer 3 is made of a polyethylene multi-stage microporous breathable film, and the raw materials include the following components by weight: 30-50 parts of calcium carbonate, 40-60 parts of polyethylene, 1-2 parts of PE wax, 0.5-1 part of titanium dioxide, and 0.1-0.5 part of antioxidant.

[0030] The calcium carbonate is wet-ground, resulting in a well-defined particle shape, with most particles being spherical or nearly spherical, and a narrow, uniform particle size distribution, concentrated below 1 μm. The polyethylene multi-stage microporous breathable membrane, prepared using wet-ground calcium carbonate as a porogen, has a small pore size, effectively blocking bacteriophage penetration while allowing hot, humid gases to pass through.

[0031] The preparation method of the moisture-permeable barrier layer 3 is as follows: the raw materials are mixed and then subjected to heating, melting, extrusion, casting, and biaxial stretching to form a polyethylene multi-stage microporous breathable film.

[0032] The melting temperature is preferably 160-180° C., the extrusion temperature is preferably 240-260° C., the casting speed is preferably 10 m / min, and the biaxial stretching ratio is preferably 1:(3-20).

[0033] The pore size of the polyethylene multi-stage microporous breathable membrane is 0.05 to 2 μm.

[0034] The weight of the polyethylene multi-stage microporous breathable membrane is ≥15g / m 2 .

[0035] The support layer 4 is made of one of polypropylene spunbond non-woven fabric and polyester spunbond non-woven fabric, which provides the composite material with main mechanical properties.

[0036] The weight of the support layer 4 is ≥15g / m 2 .

[0037] The thermal and moisture comfortable composite material resistant to bacteriophage penetration provided by the present invention is described below with reference to specific embodiments.

[0038] Example 1

[0039] Example 1 provides a thermal and moisture-comfortable composite material that is resistant to bacteriophage penetration, wherein the skin-friendly layer 1 is made of 15g / m 2 The hydrophilic polypropylene spunbond non-woven fabric; the moisture-permeable barrier layer 3 adopts a polyethylene multi-stage microporous breathable film, the raw materials of which include the following components by weight: 42.5 parts of wet-ground calcium carbonate, 55 parts of polyethylene, 1 part of PE wax, 1 part of titanium dioxide, and 0.5 parts of antioxidant; the above materials are blended in proportion, heated in sections by a screw, and extruded into a film with a melting temperature of 170°C, an extrusion temperature of 245°C, and a speed of 10m / min for cast molding, and then biaxially stretched with a stretch ratio of 1:6 to form a 15g / m 2 Polyethylene multi-stage microporous breathable membrane; support layer 4 uses 15g / m 2 Polypropylene spunbond nonwoven fabric.

[0040] The materials are compounded in the order of skin-friendly layer 1, moisture-permeable barrier layer 3, support layer 4, and moisture-permeable barrier layer 3 from the inside out. The amount of hot melt adhesive is 2g / m 2 , and the weight is about 66g / m 2 composite materials.

[0041] The composite material obtained in Example 1 was subjected to performance testing, and the results are shown in the following table.

[0042] Table 1 Mechanical properties test results of Example 1

[0043] Anti-phage penetration assay:

[0044] Test standard strain: bacteriophage Phi-X 174; test procedure: Procedure B (5 min 0 kPa + 1 min 13.8 kPa + 54 min 0 kPa), the results are as follows.

[0045] Table 2 Test results of anti-phage penetration experiment in Example 1

[0046] Comparative Example 1

[0047] Comparative Example 1 provides a thermal and moisture-comfortable composite material that resists bacteriophage penetration. The only difference from Example 1 is that the moisture-permeable barrier layer 3 is made of 15g / m 2 The non-breathable polyethylene film, other experimental conditions and parameters are the same as those in Example 1 and will not be repeated here.

[0048] The composite material obtained in Comparative Example 1 was subjected to performance tests, and the results are shown in the following table.

[0049] Table 3 Mechanical properties test results of Comparative Example 1

[0050] The anti-phage penetration experiment was the same as in Example 1, and the results are as follows.

[0051] Table 4 Comparative Example 1 Anti-phage Penetration Experiment Test Results

[0052] Example 2

[0053] Example 2 provides a thermal and moisture-comfortable composite material that is resistant to bacteriophage penetration, wherein the skin-friendly layer 1 is made of 17g / m 2 The hydrophilic polypropylene spunbond non-woven fabric; the moisture-permeable barrier layer 3 adopts a polyethylene multi-stage microporous breathable film, the raw materials of which include the following components by weight: 45.5 parts of wet-ground calcium carbonate, 52 parts of polyethylene, 1.5 parts of PE wax, 0.5 parts of titanium dioxide, and 0.5 parts of antioxidant; the above materials are blended in proportion, heated in sections by a screw, and extruded into a film with a melting temperature of 165°C, an extrusion temperature of 240°C, and a speed of 10m / min for cast molding, and then subjected to a biaxial stretching treatment with a stretch ratio of 1:5 to form a 15g / m 2 Polyethylene multi-stage microporous breathable membrane; support layer 4 uses 17g / m 2 Polypropylene spunbond nonwoven fabric.

[0054] The materials are compounded in the order of skin-friendly layer 1, moisture-permeable barrier layer 3, support layer 4, and moisture-permeable barrier layer 3 from the inside out. The amount of hot melt adhesive is 2g / m 2 , and the weight is about 70g / m 2 composite fabrics.

[0055] The composite material obtained in Example 2 was subjected to performance testing, and the results are shown in the following table.

[0056] Table 5 Mechanical properties test results of Example 2

[0057] The anti-phage penetration experiment was the same as in Example 1, and the results are as follows.

[0058] Table 6 Test results of anti-phage penetration experiment in Example 2

[0059] Comparative Example 2

[0060] Comparative Example 2 provides a thermal and moisture comfortable composite material that is resistant to bacteriophage penetration. The only difference from Example 2 is that the materials are compounded together from the inside to the outside in the order of skin-friendly layer 1, moisture-permeable barrier layer 3, and support layer 4 by hot melt adhesive. Other experimental conditions and parameters are the same as those in Example 2 and will not be repeated here.

[0061] The composite material obtained in Comparative Example 2 was subjected to performance tests, and the results are shown in the following table.

[0062] Table 7 Mechanical properties test results of Comparative Example 2

[0063] The anti-phage penetration experiment was the same as in Example 1, and the results are as follows.

[0064] Table 8 Comparative Example 2 Anti-phage Penetration Experiment Test Results

[0065] Example 3

[0066] Example 3 provides a thermal and moisture-comfortable composite material that is resistant to bacteriophage penetration, wherein the skin-friendly layer 1 is made of 15g / m 2 The hydrophilic polypropylene spunbond non-woven fabric; the moisture-permeable barrier layer 3 adopts a polyethylene multi-stage microporous breathable film, the raw materials of which include the following components by weight: 50 parts of wet-ground calcium carbonate, 46.5 parts of polyethylene, 2 parts of PE wax, 1 part of titanium dioxide, and 0.5 parts of antioxidant; the above materials are blended according to the proportion, heated in sections by the screw, and extruded into a film with a melting temperature of 180°C, an extrusion temperature of 250°C, and a speed of 10m / min for cast molding, and then biaxially stretched with a stretch ratio of 1:10 to form a 16g / m 2 Polyethylene multi-stage microporous breathable membrane; support layer 4 uses 15g / m 2 Polypropylene spunbond nonwoven fabric.

[0067] The materials are compounded in the order of skin-friendly layer 1, moisture-permeable barrier layer 3, support layer 4, and moisture-permeable barrier layer 3 from the inside out. The amount of hot melt adhesive is 3g / m2 , the weight is about 71g / m 2 composite fabrics.

[0068] The composite material obtained in Example 3 was subjected to performance testing, and the results are shown in the following table.

[0069] Table 9 Mechanical properties test results of Example 3

[0070] The anti-phage penetration experiment was the same as in Example 1, and the results are as follows.

[0071] Table 10 Example 3 Anti-phage penetration test results

[0072] Comparative Example 3

[0073] Comparative Example 3 provides a thermal and moisture comfortable composite material that is resistant to bacteriophage penetration. Compared with Example 3, the only difference is that the raw materials of the polyethylene multi-stage microporous breathable membrane include the following components in parts by weight: 60 parts of wet-ground calcium carbonate, 36.5 parts of polyethylene, 2 parts of PE wax, 1 part of titanium dioxide, and 0.5 parts of antioxidant; the other experimental conditions and parameters are the same as those in Example 3 and are not repeated here.

[0074] The composite material obtained in Comparative Example 3 was subjected to performance tests, and the results are shown in the following table.

[0075] Table 11 Mechanical properties test results of comparative example 3

[0076] The anti-phage penetration experiment was the same as in Example 1, and the results are as follows.

[0077] Table 12 Comparative Example 3 Anti-phage Penetration Experiment Test Results

[0078] From the above data, it can be seen that Example 1 and Comparative Example 1 have the same gram weight and structure. The difference lies in whether the membrane has a porous structure. The mechanical property test values ​​are not much different, and both can meet the use requirements. However, the moisture permeability of the sample in Example 1 is much higher than that of Comparative Example 1. This parameter is an important indicator reflecting thermal and hygroscopic comfort.

[0079] Compared with Example 2, Comparative Example 2 differs in that the composite structure lacks a moisture-permeable barrier layer 3. It can be seen that the mechanical properties of the composite material of Comparative Example 2 are slightly reduced, and it fails in the anti-phage penetration test.

[0080] The difference between Comparative Example 3 and Example 3 is that the raw material ratio in Comparative Example 3 exceeds the scope of the present invention, resulting in failure of the anti-phage penetration test.

[0081] In summary, the present invention provides a thermal and moisture comfortable composite material that is resistant to bacteriophage penetration, which solves the problem in the prior art that the barrier properties and moisture permeability of composite materials cannot simultaneously meet the requirements of long-term wear. This composite material meets the barrier requirements for bacteriophages while being light in weight, and at the same time has good moisture permeability, meets usage needs, and can be applied to medical and industrial protection fields.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A thermal and moisture comfortable composite material that resists bacteriophage penetration, characterized in that: It includes a skin-friendly layer, a moisture-permeable barrier layer, a support layer, and a moisture-permeable barrier layer, which are arranged in sequence from the inside to the outside; the layers are bonded by hot melt adhesive.

2. The thermal and moisture comfortable composite material resistant to bacteriophage penetration according to claim 1, characterized in that: The skin-friendly layer is made of polypropylene spunbond non-woven fabric modified by a hydrophilic agent, with a weight of ≥12g / m 2 .

3. The thermal and moisture comfortable composite material resistant to bacteriophage penetration according to claim 1, characterized in that: The moisture-permeable barrier layer adopts a polyethylene multi-stage microporous breathable film, and the raw materials include the following components by weight: 30-50 parts of calcium carbonate, 40-60 parts of polyethylene, 1-2 parts of PE wax, 0.5-1 part of titanium dioxide, and 0.1-0.5 part of antioxidant.

4. The thermal and moisture comfortable composite material resistant to bacteriophage penetration according to claim 3, characterized in that: The calcium carbonate is wet-ground calcium carbonate with a particle size of less than 1 μm.

5. The thermal and moisture comfortable composite material resistant to bacteriophage penetration according to claim 3, characterized in that: The preparation method of the moisture-permeable barrier layer comprises the following steps: mixing raw materials, heating and melting, extruding, casting, and biaxially stretching to form a polyethylene multi-stage microporous breathable film.

6. The thermal and moisture comfortable composite material resistant to bacteriophage penetration according to claim 5, characterized in that: The melting temperature is 160-180° C., the extrusion temperature is 240-260° C., the casting speed is 10 m / min, and the biaxial stretching ratio is 1:(3-20).

7. The thermal and moisture comfortable composite material resistant to bacteriophage penetration according to claim 5, characterized in that: The pore size of the polyethylene multi-stage microporous breathable membrane is 0.05 to 2 μm.

8. The thermal and moisture comfortable composite material resistant to bacteriophage penetration according to claim 7, characterized in that: The weight of the polyethylene multi-stage microporous breathable membrane is ≥15g / m 2 .

9. The thermal and moisture comfortable composite material resistant to bacteriophage penetration according to claim 1, characterized in that: The support layer is made of one of polypropylene spunbond non-woven fabric and polyester spunbond non-woven fabric.

10. The thermal and moisture comfortable composite material resistant to bacteriophage penetration according to claim 9, characterized in that: The weight of the support layer is ≥15g / m 2 .

Images