Heat and moisture comfort composite material resistant to phage penetration

Abstract

The present application provides a kind of anti-phage penetration heat and moisture comfort composite material, including skin layer, moisture-permeable barrier layer, support layer, moisture-permeable barrier layer from inside to outside successively arranged, and layer and layer are bonded by hot melt adhesive;Skin layer uses polypropylene spun-bonded nonwoven fabric of hydrophilic agent blend modification;Moisture-permeable barrier layer uses polyethylene multistage microporous breathable film, raw material includes calcium carbonate, polyethylene, PE wax, titanium dioxide and antioxidant, is prepared by heating melting, extrusion, flow casting, biaxial stretching;Support layer uses one of polypropylene spun-bonded nonwoven fabric, polyester spun-bonded nonwoven fabric.The anti-phage penetration heat and moisture comfort composite material provided by the present application, heat and moisture gas can be led out to external environment through micropore, simultaneously, it can resist the penetration of phage, protect the user from the invasion of bacteria and virus, can be applied to medical and industrial protection field.

Description

Technical Field

[0001] This invention relates to the field of composite materials technology, and in particular to a thermal and moisture-comfort composite material resistant to bacteriophage penetration. Background Technology

[0002] Healthcare workers wear protective gear such as surgical gowns and isolation gowns to prevent microbial invasion and the spread of bacteria and viruses from the blood between doctors and patients. Bacteriophages are viruses that attack bacteria and also contain genetic material that imparts biological traits to the host bacteria. Currently, the protective materials on the market used to block bacteriophage penetration are mainly coated materials or double-layer fabrics composed of an impermeable barrier membrane and non-woven fabric. The coating is mostly made of PU, and the impermeable barrier membrane is mainly made of EVOH. Wearing these for a long time can easily cause stuffiness and other discomfort. Therefore, the softness, barrier properties, and moisture permeability of medical protective fabrics need to be improved.

[0003] The price of plastic particles, from high to low, is roughly ranked as follows: EVOH > PU > EVA > PA > PC > PP > PE. By adjusting the formulation and structure, using PE to replace other expensive plastics can save a lot of costs for the entire protective industry.

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

[0005] To address the shortcomings of the prior art, the present invention aims to provide a heat and moisture comfort composite material that resists phage penetration. This solves the problem that the barrier properties and moisture permeability of the composite material in the prior art cannot simultaneously meet the requirements for long-term wear. This composite material, while being lightweight, meets the requirements for phage barrier and has good moisture permeability, thus meeting the usage needs.

[0006] To achieve the above objectives, the present invention provides a thermo-moisture-comfort composite material resistant to phage penetration, comprising, from the inside out, a skin-friendly layer, a moisture-permeable barrier layer, a support layer, and a moisture-permeable barrier layer; the layers are bonded together by hot melt adhesive.

[0007] As a further improvement of the present invention, the skin-friendly layer is made of polypropylene spunbond nonwoven fabric modified with a hydrophilic agent, with a weight ≥12g / m². 2 .

[0008] As a further improvement of the present invention, the moisture-permeable barrier layer is made of polyethylene multi-level microporous breathable membrane, and the raw materials include the following components by weight: calcium carbonate 30-50 parts, polyethylene 40-60 parts, PE wax 1-2 parts, titanium dioxide 0.5-1 parts, and antioxidant 0.1-0.5 parts.

[0009] Furthermore, the calcium carbonate is wet-milled calcium carbonate with a particle size of less than 1 μm.

[0010] Furthermore, the method for preparing the moisture-permeable barrier layer is as follows: after mixing the raw materials, the mixture is heated and melted, extruded, cast and molded, and biaxially stretched to form a polyethylene multi-level microporous breathable membrane.

[0011] 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).

[0012] Furthermore, the pore size of the polyethylene multi-level microporous breathable membrane is 0.05–2 μm.

[0013] Furthermore, the weight of the polyethylene multi-level microporous breathable membrane is ≥15g / m³. 2 .

[0014] As a further improvement of the present invention, the support layer is made of either polypropylene spunbond nonwoven fabric or polyester spunbond nonwoven fabric.

[0015] Furthermore, the weight of the support layer is ≥15g / m². 2 .

[0016] The beneficial effects of this invention are:

[0017] (1) This invention provides a heat and moisture comfort composite material that resists phage penetration. It is composed of a skin-friendly layer, a moisture-permeable barrier layer, a support layer, and a moisture-permeable barrier layer bonded together with hot melt adhesive. Hot and humid gases can be discharged to the external environment through micropores, while resisting the penetration of phages and protecting users from bacteria and viruses. It can be applied in the fields of medical and industrial protection.

[0018] (2) Existing anti-phage penetration materials are mainly coatings or non-breathable barrier membranes and non-woven fabric composites. Because of their extremely poor breathability, hot and humid gases cannot be discharged, and wearing them for a long time will cause discomfort such as stuffiness. The material provided by this invention is a multi-level microporous breathable composite material, which can block the penetration of phages while facilitating the passage of hot and humid gases.

[0019] (3) The composite material proposed in this invention is cheaper than the materials used in the prior art. It uses a multi-level 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. Attached Figure Description

[0020] Figure 1 A schematic diagram of the thermal and moisture-comfort composite material structure that resists phage penetration provided by the present invention.

[0021] Figure Labels

[0022] 1-Skin-friendly layer; 2-Adhesive layer; 3-Moisture-permeable barrier layer; 4-Supporting layer. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0025] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] This invention provides a thermo-moisture-comfortable composite material resistant to bacteriophage penetration, comprising, from the inside out, a skin-friendly layer 1, a moisture-permeable barrier layer 3, a support layer 4, and another moisture-permeable barrier layer 3; the layers are bonded together with hot melt adhesive to form an adhesive layer 2, as shown in the schematic diagram below. Figure 1 As shown.

[0027] The skin-friendly layer 1 is made of hydrophilic agent-modified polypropylene spunbond nonwoven fabric with a weight ≥12g / m². 2 It has a soft feel and good moisture absorption.

[0028] The moisture-permeable barrier layer 3 is made of polyethylene multi-level microporous breathable membrane, and the raw materials include the following components by weight: calcium carbonate 30-50 parts, polyethylene 40-60 parts, PE wax 1-2 parts, titanium dioxide 0.5-1 parts, and antioxidant 0.1-0.5 parts.

[0029] The calcium carbonate used is wet-milled calcium carbonate, with good particle morphology, mostly spherical or near-spherical, narrow particle size distribution, and uniform particle size, concentrated below 1 μm. The polyethylene multi-level microporous breathable membrane prepared using wet-milled calcium carbonate as a pore-forming agent has small pore size, which can effectively block phage penetration while allowing hot and humid gases to pass through.

[0030] The method for preparing the moisture-permeable barrier layer 3 is as follows: after mixing the raw materials, the mixture is heated and melted, extruded, cast and molded, and biaxially stretched to form a polyethylene multi-level microporous breathable membrane.

[0031] The melting temperature is preferably 160-180℃, the extrusion temperature is preferably 240-260℃, the casting speed is preferably 10m / min, and the biaxial stretching ratio is preferably 1:(3-20).

[0032] The pore size of the polyethylene multi-level microporous breathable membrane is 0.05 to 2 μm.

[0033] The weight of the polyethylene multi-level microporous breathable membrane is ≥15g / m³. 2 .

[0034] The support layer 4 is made of either polypropylene spunbond nonwoven fabric or polyester spunbond nonwoven fabric, providing the main mechanical properties for the composite material.

[0035] The weight of the support layer 4 is ≥15g / m 2 .

[0036] The following describes the thermo-humidity comfort composite material resistant to phage penetration provided by the present invention with reference to specific embodiments.

[0037] Example 1

[0038] Example 1 provides a thermal and moisture-comfort composite material resistant to phage penetration, wherein the skin-friendly layer 1 uses 15g / m 2 The hydrophilic polypropylene spunbond nonwoven fabric; the moisture-permeable barrier layer 3 is made of polyethylene multi-level microporous breathable membrane, the raw materials of which include the following components by weight: wet-milled calcium carbonate 42.5 parts, polyethylene 55 parts, PE wax 1 part, titanium dioxide 1 part, antioxidant 0.5 parts; the above materials are blended in proportion, heated in sections by a screw, extruded into a film, the melt temperature is 170℃, the extrusion temperature is 245℃, the speed is 10m / min for casting molding, and then subjected to biaxial stretching treatment, the stretching ratio is 1:6, forming 15g / m 2 Polyethylene multi-stage microporous breathable membrane; support layer 4 uses 15g / m 2 Polypropylene spunbond nonwoven fabric.

[0039] The materials are laminated sequentially from the inside out in the following order: skin-friendly layer 1, moisture-permeable barrier layer 3, support layer 4, and moisture-permeable barrier layer 3. The amount of hot melt adhesive used is 2g / m². 2 The weight obtained is approximately 66 g / m³. 2 Composite materials.

[0040] The composite material obtained in Example 1 was subjected to performance testing, and the results are shown in the table below.

[0041] Table 1. Mechanical performance test results of Example 1

[0042]

[0043]

[0044] Antiphage penetration assay:

[0045] Test standard strain: bacteriophage Phi-X 174; test procedure: procedure B (5 min 0 kPa + 1 min 13.8 kPa + 54 min 0 kPa), results are as follows.

[0046] Table 2 Results of Antiphage Penetration Test in Example 1

[0047]

[0048] Comparative Example 1

[0049] Comparative Example 1 provides a thermo-moisture comfort composite material resistant to bacteriophage penetration, differing from Example 1 only in that the moisture-permeable barrier layer 3 uses a 15g / m² material. 2 The non-permeable polyethylene membrane was used, and other experimental conditions and parameters were the same as in Example 1, which will not be repeated here.

[0050] The composite material obtained in Comparative Example 1 was subjected to performance testing, and the results are shown in the table below.

[0051] Table 3. Mechanical performance test results of Comparative Example 1

[0052]

[0053] The antiphage penetration experiment was the same as in Example 1, and the results are as follows.

[0054] Table 4. Results of the antiphage penetration test in Comparative Example 1

[0055]

[0056]

[0057] Example 2

[0058] Example 2 provides a thermal and moisture-comfort composite material resistant to phage penetration, wherein the skin-friendly layer 1 uses 17 g / m 2 The hydrophilic polypropylene spunbond nonwoven fabric; the moisture-permeable barrier layer 3 is made of polyethylene multi-level microporous breathable membrane, the raw materials of which include the following components by weight: wet-milled calcium carbonate 45.5 parts, polyethylene 52 parts, PE wax 1.5 parts, titanium dioxide 0.5 parts, antioxidant 0.5 parts; the above materials are blended in proportion, heated in sections by a screw, extruded into a film, the melt temperature is 165℃, the extrusion temperature is 240℃, the speed is 10m / min for casting, and then subjected to biaxial stretching treatment, the stretching ratio is 1:5, forming a 15g / m 2 Polyethylene multi-stage microporous breathable membrane; support layer 4 uses 17g / m2 Polypropylene spunbond nonwoven fabric.

[0059] The materials are laminated sequentially from the inside out in the following order: skin-friendly layer 1, moisture-permeable barrier layer 3, support layer 4, and moisture-permeable barrier layer 3. The amount of hot melt adhesive used is 2g / m². 2 The weight obtained is approximately 70 g / m³. 2 Composite fabric.

[0060] The composite material obtained in Example 2 was subjected to performance testing, and the results are shown in the table below.

[0061] Table 5. Mechanical performance test results of Example 2

[0062]

[0063]

[0064] The antiphage penetration experiment was the same as in Example 1, and the results are as follows.

[0065] Table 6 Results of the antiphage penetration test in Example 2

[0066]

[0067] Comparative Example 2

[0068] Comparative Example 2 provides a thermo-moisture comfort composite material that resists phage penetration. The only difference from Example 2 is that the materials are bonded together from the inside out in the order of skin-friendly layer 1, moisture-permeable barrier layer 3, and support layer 4 using hot melt adhesive. Other experimental conditions and parameters are the same as in Example 2, and will not be repeated here.

[0069] The composite material obtained in Comparative Example 2 was subjected to performance testing, and the results are shown in the table below.

[0070] Table 7. Mechanical property test results of Comparative Example 2

[0071]

[0072]

[0073] The antiphage penetration experiment was the same as in Example 1, and the results are as follows.

[0074] Table 8. Results of the antiphage penetration test in Comparative Example 2

[0075]

[0076] Example 3

[0077] Example 3 provides a thermal and moisture-comfort composite material resistant to phage penetration, wherein the skin-friendly layer 1 uses 15g / m 2The hydrophilic polypropylene spunbond nonwoven fabric; the moisture-permeable barrier layer 3 is made of polyethylene multi-level microporous breathable membrane, the raw materials of which include the following components by weight: 50 parts wet-milled calcium carbonate, 46.5 parts polyethylene, 2 parts PE wax, 1 part titanium dioxide, and 0.5 parts antioxidant; the above materials are blended in proportion, heated in sections by a screw, extruded into a film, the melt temperature is 180℃, the extrusion temperature is 250℃, the speed is 10m / min for casting, and then subjected to biaxial stretching treatment, the stretching ratio is 1:10, forming a film with 16g / m 2 Polyethylene multi-stage microporous breathable membrane; support layer 4 uses 15g / m 2 Polypropylene spunbond nonwoven fabric.

[0078] The materials are laminated sequentially from the inside out in the following order: skin-friendly layer 1, moisture-permeable barrier layer 3, support layer 4, and moisture-permeable barrier layer 3. The amount of hot melt adhesive used is 3g / m². 2 The weight obtained was approximately 71 g / m³. 2 Composite fabric.

[0079] The composite material obtained in Example 3 was subjected to performance testing, and the results are shown in the table below.

[0080] Table 9. Mechanical performance test results of Example 3

[0081]

[0082]

[0083] The antiphage penetration experiment was the same as in Example 1, and the results are as follows.

[0084] Table 10 Results of the antiphage penetration test in Example 3

[0085]

[0086] Comparative Example 3

[0087] Comparative Example 3 provides a thermo-moisture comfort composite material resistant to phage penetration. The only difference from Example 3 is that the raw material of the polyethylene multi-level microporous breathable membrane includes the following components by weight: 60 parts wet-milled calcium carbonate, 36.5 parts polyethylene, 2 parts PE wax, 1 part titanium dioxide, and 0.5 parts antioxidant. Other experimental conditions and parameters are the same as in Example 3 and will not be repeated here.

[0088] The composite material obtained in Comparative Example 3 was subjected to performance tests, and the results are shown in the table below.

[0089] Table 11 Mechanical property test results of Comparative Example 3

[0090]

[0091]

[0092] The antiphage penetration experiment was the same as in Example 1, and the results are as follows.

[0093] Table 12 Results of the antiphage penetration test in Comparative Example 3

[0094]

[0095] As can be seen from the above data, Example 1 and Comparative Example 1 have the same 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 usage requirements. However, the moisture permeability of the sample in Example 1 is much higher than that in Comparative Example 1. This parameter is an important indicator of thermal and humid comfort.

[0096] 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 in Comparative Example 2 are slightly reduced, and it fails in the anti-phage penetration test.

[0097] 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 the failure of the antiphage penetration test.

[0098] In summary, the present invention provides a heat and moisture comfort composite material that resists phage penetration, which solves the problem that the barrier properties and moisture permeability of existing composite materials cannot simultaneously meet the requirements for long-term wear. This composite material, while being lightweight, meets the requirements for phage barrier and has good moisture permeability, thus meeting the usage requirements and can be applied in the fields of medical and industrial protection.

[0099] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A thermo-moisture comfort composite material resistant to bacteriophage penetration, characterized in that, It includes, from the inside out, a skin-friendly layer, a moisture-permeable barrier layer, a support layer, and another moisture-permeable barrier layer; the layers are bonded together with hot melt adhesive. The moisture-permeable barrier layer is made of polyethylene multi-level microporous breathable membrane, and the raw materials include the following components by weight: calcium carbonate 30-50 parts, polyethylene 40-60 parts, PE wax 1-2 parts, titanium dioxide 0.5-1 parts, and antioxidant 0.1-0.5 parts. The calcium carbonate is wet-milled calcium carbonate with a particle size of less than 1 μm. The method for preparing the moisture-permeable barrier layer is as follows: after mixing the raw materials, the mixture is heated and melted, extruded, cast and molded, and biaxially stretched to form a polyethylene multi-level microporous breathable membrane.

2. The thermo-moisture comfort composite material resistant to phage penetration according to claim 1, characterized in that, The skin-friendly layer is made of hydrophilic agent-modified polypropylene spunbond nonwoven fabric with a weight ≥12g / m². 2 .

3. The thermo-moisture comfort composite material resistant to phage penetration according to claim 1, characterized in that, The melting temperature is 160~180℃, the extrusion temperature is 240~260℃, the casting speed is 10m / min, and the biaxial stretching ratio is 1:(3~20).

4. The thermo-moisture comfort composite material resistant to phage penetration according to claim 1, characterized in that, The pore size of the polyethylene multi-level microporous breathable membrane is 0.05~2μm.

5. The thermo-moisture comfort composite material resistant to phage penetration according to claim 4, characterized in that, The weight of the polyethylene multi-level microporous breathable membrane is ≥15g / m³. 2 .

6. The thermo-moisture comfort composite material resistant to phage penetration according to claim 1, characterized in that, The support layer is made of either polypropylene spunbond nonwoven fabric or polyester spunbond nonwoven fabric.

7. The thermo-moisture comfort composite material resistant to phage penetration according to claim 6, characterized in that, The weight of the support layer is ≥15g / m² 2 .

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