KR20210085074A - High heat resistant medical sheet using non-swelling porous film and manufacturing method tereof - Google Patents

Abstract

The present invention relates to a high heat-resistant medical sheet using a non-swelling pore-type breathable and waterproof film, and a method for manufacturing the same. The method comprises: a polyurethane coating solution manufacturing step of preparing a coating solution comprising a base layer made of microporous polyurethane and a surface layer formed on both sides of the base layer, and comprising an emulsion-type thermoplastic polyurethane resin-containing composition; a base layer forming step of applying the coating solution prepared through the polyurethane coating solution manufacturing step to a release paper and drying the release paper to form a base layer; a surface layer lamination step of laminating a polyethylene terephthalate knitted fabric on both sides of the base layer prepared through the base layer forming step; and a laminating step of laminating the laminate manufactured through the surface layer lamination step. The high heat-resistant medical sheet using the non-swellable pore-type breathable and waterproof film have no swelling. Excellent heat resistance, high temperature sterilization and washing, and excellent water resistance and breathability can be ensured.

Description

High heat-resistance medical sheet using non-swelling pore-type breathable and waterproof film and its manufacturing method {HIGH HEAT RESISTANT MEDICAL SHEET USING NON-SWELLING POROUS FILM AND MANUFACTURING METHOD TEREOF}

The present invention relates to a high heat-resistant medical sheet using a non-swelling pore-type breathable and waterproof film and a manufacturing method thereof, and more particularly, there is no swelling phenomenon, excellent heat resistance, so high-temperature sterilization washing is possible, and excellent water resistance and breathability It relates to a high heat-resistant medical sheet using a non-swelling pore-type breathable and waterproof film and a manufacturing method therefor.

Thermoplastic polyurethane has excellent properties such as low temperature characteristics, bending resistance, abrasion resistance and heat workability, and is widely used in various fields such as shoes, clothes, and bags. In particular, it is useful as a moisture-permeable waterproof fabric material widely used in various active sportswear and casual wear such as skiing, golf wear, hiking, mountaineering, and jogging clothes.

In general, moisture-permeable waterproof fabrics prevent raindrops of 100 μm or more from passing from outside the fibers into the fibers, and form a film layer on the fabric so that 0.0004 μm of moisture emitted from the body can go out of the fibers in the fibers to express moisture permeability and waterproofness.

A method of imparting such a moisture-permeable and waterproof function can be classified into a direct coating method or a transfer coating method. The direct coating method is divided into a dry coating method in which a coating solution is applied directly to the fabric and then passed through a dryer to complete, and a wet coating method in which pores are formed by impregnating it with a coagulating solution instead of the dryer. In addition, the transfer coating method is further classified as a semi-dry lamination method.

Korean Patent No. 10-0795386 discloses a hydrophilic non-porous moisture-permeable waterproof fabric using a hydrophilic polyol of a soft segment of polyethylene glycol or polypropylene glycol.

However, the invention has problems such as a decrease in moisture permeability as the thickness of the coating layer becomes thicker due to the characteristics of the hydrophilic non-porous type, and a lot of swelling occurs and the feel becomes wet.

In addition, Korean Patent Application Laid-Open No. 10-2008-0042309 discloses a moisture-permeable and waterproof coating composition, a dry non-porous moisture-permeable waterproof fabric using the same, and a manufacturing method thereof, by coating a hydrophilic non-porous polyurethane in a two-step manufacturing process of the fabric-coating layer. We propose a coating method that can improve productivity, reduce environmental pollution, and secure excellent coating quality.

However, the dry coating method using the hydrophilic non-porous polyurethane has a disadvantage in that it has a weak washing durability as well as an environmental pollution problem, and the hydrophilic non-porous polyurethane absorbs water droplets formed on the coating surface, causing swelling.

Korean Patent Registration No. 10-0795386 (2008.01.10) Korean Patent Laid-Open No. 10-2008-0042309 (2008.05.15)

An object of the present invention is to provide a medical sheet having no swelling phenomenon, excellent heat resistance, high temperature sterilization washing, and excellent water resistance and air permeability. High heat resistance medical sheet using a non-swelling pore type breathable waterproof film, and a method for manufacturing the same is to provide

An object of the present invention is to provide a high heat-resistant medical sheet using a non-swellable pore-type breathable and waterproof film, characterized in that it consists of a base layer made of microporous polyurethane and a surface layer formed on both sides of the base layer.

According to a preferred feature of the present invention, the base layer has a pore size of 0.1 to 5㎛.

According to a more preferred feature of the present invention, the base layer is to have a thickness of 40 to 80㎛.

According to a more preferred feature of the present invention, the surface layer is made of a polyethylene terephthalate knitted fabric having a thickness of 10 to 30 μm.

According to a further preferred feature of the present invention, the high heat-resistant medical sheet using the non-swelling pore-type breathable and waterproof film has a water resistance of 10,000 mmH ₂ O or more, and a water vapor transmission rate by the potassium acetate method is 30,000 g/m 2 ·day or more and the moisture permeability resistance is 10㎡.pa/w or less.

According to an even more preferred feature of the present invention, the high heat-resistance medical sheet using the non-swelling pore-type breathable and waterproof film is to be used as a surgical gown or surgical cloth.

In addition, an object of the present invention is to remove the release paper after applying the coating solution prepared through the polyurethane coating solution manufacturing step and the polyurethane coating solution manufacturing step to a release paper and drying it to prepare a coating solution consisting of an emulsion-type thermoplastic polyurethane resin-containing composition. A base layer forming step of forming a base layer, a surface layer lamination step of laminating a polyethylene terephthalate knitted fabric on both sides of the base layer prepared through the base layer forming step, and a lamination step of laminating the laminate prepared through the surface layer lamination step It can also be achieved by providing a method for manufacturing a high heat-resistant medical sheet using a non-swelling pore-type breathable and waterproof film, characterized in that consisting of.

According to a preferred feature of the present invention, the coating solution comprises 100 parts by weight of an emulsion-type thermoplastic polyurethane, 70 to 90 parts by weight of a solvent, 1 to 3 parts by weight of a non-yellowing crosslinking agent, 1 to 3 parts by weight of a water repellent, and 1 to 3 parts by weight of a slip agent. Part, and the solvent is methyl ethyl ketone, toluene and water.

The high heat-resistant medical sheet using the non-swellable pore-type breathable and waterproof film according to the present invention and its manufacturing method do not have swelling, have excellent heat resistance, so can be sterilized and washed at high temperature, and provide a medical sheet exhibiting excellent water resistance and breathability shows excellent effect.

1 is a schematic diagram showing a layer structure of a high heat-resistant medical sheet using a non-swellable pore-type breathable and waterproof film according to the present invention.
Figure 2 is a flow chart showing a method of manufacturing a high heat-resistant medical sheet using a non-swellable pore-type breathable waterproof film according to the present invention.

Hereinafter, a preferred embodiment of the present invention and the physical properties of each component will be described in detail, which is intended to describe in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily carry out the invention, This does not mean that the technical spirit and scope of the present invention is limited.

The high heat-resistance medical sheet using the non-swellable pore-type breathable and waterproof film according to the present invention consists of a base layer 10 made of microporous polyurethane and a surface layer 20 formed on both sides of the base layer 10 .

The base layer 10 is made of microporous polyurethane, which is a layer serving as a base material for a high heat-resistance medical sheet using the non-swellable pore-type breathable and waterproof film according to the present invention, and the medical sheet is not deformed or damaged by external force. It plays a role in giving shape stability and giving breathability.

The base layer 10 is prepared by coating a coating solution composed of an emulsion-type thermoplastic polyurethane resin-containing composition on one surface of a release paper, drying it, and removing the release paper. More specifically, the dry coagulation method, wet coagulation method It is a method of dissolving polyurethane in a solvent to form micropores by dry or wet coagulation, 100 parts by weight of emulsion-type thermoplastic polyurethane, 70 to 90 parts by weight of solvent, 1 to 3 parts by weight of non-yellowing crosslinking agent It is made by coating a release paper with an emulsion-type thermoplastic polyurethane resin-containing composition consisting of parts, 1 to 3 parts by weight of a water repellent, and 1 to 3 parts by weight of a slip agent, and sequentially according to the principle of selective evaporation of solvent and water according to drying temperature. discharged, which may lead to the formation of microporos.

In this case, the solvent is preferably made of methyl ethyl ketone, toluene and water.

In addition, the base layer 10 has excellent water resistance to suppress swelling of the medical sheet, and pores of 0.1 to 5 μm are formed to show waterproofness against water droplets (diameter 100 μm or more), and water vapor molecules (diameter 0.0004 μm) shows moisture permeability.

In addition, the base layer 10 is formed to a thickness of 40 to 80㎛, when the thickness of the base layer 10 is less than 40㎛, the mechanical strength of the medical sheet may be lowered, the base layer (10) If the thickness of the sheet exceeds 80㎛, it is not preferable because the thickness of the sheet is excessively increased without significantly improving the mechanical strength.

At this time, the microporous polyurethane constituting the base layer 10 has a viscosity of 20 Pa.s/25° C., and is aromatic using a composition containing a polyurethane resin based on a polyether of one component. A substrate layer may be formed, and the solvent and water are sequentially discharged according to the principle of the selective evaporation of the solvent and water according to the drying temperature, thereby forming microporous.

In addition, the base layer 10 serves to provide a medical sheet that can be sterilized and washed at a high temperature due to its excellent heat resistance, and the durability is maintained even after sterilization and washing more than 75 times at a temperature of 135° C. in an autoclave. It shows physical properties that do not deteriorate.

Therefore, it is possible to provide medical scrubs and scrubs that meet the standards for resistance to bacteria and blood of the US FDA's Medical Device Level 4 or higher, which is the required performance standard for US scrubs and scrubs.

The surface layer 20 is formed on both sides of the base layer 10 and is made of polyethylene terephthalate knitted fabric, and serves to improve mechanical properties such as tensile strength and abrasion resistance of the medical sheet according to the present invention.

At this time, the surface layer 20 exhibits a thickness of 10 to 30 μm. If the thickness of the surface layer 20 is less than 10 μm, the above effect is insignificant, and when the thickness of the surface layer 20 exceeds 30 μm, The above effect is not preferable because the thickness of the medical sheet is excessively increased without greatly improving the effect, and the flexibility of the medical sheet is lowered.

The high heat-resistant medical sheet using the non-swellable pore-type breathable and waterproof film having the structure of the base layer 10 and the surface layer 20 has a water resistance of 10,000 mmH ₂ O or more, and the water vapor permeability by the potassium acetate method is 30,000 g /m2·day or more, and moisture permeability resistance of 10m2.pa/w or less, indicating properties suitable for use as surgical clothes and surgical cloths.

In addition, the method for manufacturing a high heat-resistant medical sheet using a non-swelling pore-type breathable and waterproof film according to the present invention is a polyurethane coating solution manufacturing step (S101) for preparing a coating solution made of an emulsion-type thermoplastic polyurethane resin-containing composition, the poly After applying the coating solution prepared through the urethane coating solution manufacturing step (S101) to a release paper and drying it, the base layer forming step (S103) of removing the release paper to form the base layer 10, the base layer forming step (S103) Manufactured through It consists of a surface layer lamination step (S105) of laminating a polyethylene terephthalate knitted fabric on both sides of the base layer 10 and a lamination step (S107) of laminating the laminate prepared through the surface layer lamination step (S105).

The polyurethane coating solution manufacturing step (S101) is a step of preparing a coating solution consisting of an emulsion-type thermoplastic polyurethane resin-containing composition, 100 parts by weight of an emulsion-type thermoplastic polyurethane, 70 to 90 parts by weight of a solvent, 1 to non-yellowing crosslinking agent It consists of 3 parts by weight, 1 to 3 parts by weight of a water repellent, and 1 to 3 parts by weight of a slip agent, and the solvent is a mixture of methyl ethyl ketone, toluene and water.

In more detail, the coating solution composed of the above components has a viscosity of 20 Pas/25° C. and uses a composition containing an aromatic and one-component polyether-based polyurethane resin to form the base layer 10 having porosity. At this time, according to the drying temperature, the solvent and water are sequentially discharged according to the principle of the selective evaporation method, thereby forming microporous. The water-in-oil dispersion (w) prepared by mixing the polyurethane resin and the nonionic surfactant /o) Emulsion-type thermoplastic polyurethane resin is added to a mixed solvent in which methyl ethyl ketone and toluene are mixed in a weight ratio of 1:1, and a water repellent agent, slip agent and water are added and stirred, and then left to stand for 20 to 24 hours. It is prepared through the process of adding a crosslinking agent to the mixed solution.

The base layer forming step (S103) is a step of applying the coating solution prepared through the polyurethane coating solution manufacturing step (S101) to a thickness of 40 to 80 μm on a release paper and removing the release paper after drying to form the base layer 10 Thus, the base layer forming step (S103) may be formed by a dry solidification method or a wet solidification method, and polyurethane may be dissolved in a solvent to form micropores by dry or wet solidification. The diameter (2-20 μm) of the micropores formed through the above process is much smaller than the water droplet diameter (100 μm or more) and much larger than the water vapor molecular diameter (0.0004 μm), so waterproof moisture permeability is expressed. In addition, a composition containing a polyurethane resin having a viscosity of 20 Pas/25° C., aromatic and one-component polyether-based polyurethane resin may be used to form the base layer 10 having porosity. At this time, according to the drying temperature, the solvent and water are sequentially discharged according to the principle of the selective evaporation method, thereby forming microporous.

In addition, in the dry method, a water-in-oil-dispersion (w/o) emulsion-type polyurethane resin prepared by mixing a one-component or two-component polyurethane resin and a nonionic surfactant is mixed with methyl ethyl ketone and toluene in a weight ratio of 1:1. After adding to the mixed solvent, adding a slip agent and water, stirring, and leaving the mixture to stand for 20 to 24 hours, a crosslinking agent is added to the prepared mixed solution to prepare a coating solution, and then the coating solution is coated on a release paper and dried with a hot air dryer, The solvent and moisture may be removed through drying to prepare microporous pores. In this case, the base layer 10 is formed with microporous cells having an average pore size of 1 to 10 μm.

The surface layer lamination step (S105) is a step of laminating the surface layer 20 made of polyethylene terephthalate knitted fabric on both sides of the base layer 10 prepared through the base layer forming step (S103), the base layer forming step ( S103) is made by laminating a polyethylene terephthalate knitted fabric having a thickness of 10 to 30 μm on both sides of the base layer 10 prepared through S103). When the polyethylene terephthalate knitted fabric having a thickness of 10 to 30 μm is laminated as described above, according to the present invention Mechanical properties such as tensile strength and abrasion resistance of the medical sheet are further improved.

At this time, the surface layer lamination step (S105) is preferably performed by applying a hot melt adhesive to the polyethylene terephthalate knitted fabric used as the surface layer 20, and laminating it with the base layer 10, and the hot melt adhesive is It is not particularly limited as long as it is a common material capable of bonding the base layer 10 and the surface layer 20 to each other, and any type may be used.

When the surface layer 20 made of the polyethylene terephthalate knitted fabric is laminated as described above, since the pores of the polyethylene terephthalate knitted fabric exhibit a significantly larger size than the pores formed in the base layer 10, the base layer forming step While the air permeability of the base layer 20 prepared through (S103) is maintained, the mechanical properties can be improved as described above, whereas when a polyethylene terephthalate film is applied, the air permeability of the base layer 10 is maintained. this cannot be maintained.

The laminating step (S107) is a step of laminating the laminate manufactured through the surface layer lamination step (S105), and the laminate manufactured through the surface layer lamination step (S105) is put into a hot melt laminating machine and lamination process. is done

At this time, the hot-melt laminating machine is not particularly limited as long as it can laminate the base layer 10 made of polyurethane and the surface layer 20 made of polyethylene terephthalate knitted fabric by a hot-melt method.

After the lamination step (S107) consisting of the above process, the manufacture of the high heat-resistant medical sheet using the non-swellable pore-type breathable and waterproof film according to the present invention is completed.

Hereinafter, a method for manufacturing a high heat-resistant medical sheet using the non-swellable pore-type breathable and waterproof film according to the present invention and the physical properties of the medical sheet manufactured through the manufacturing method will be described by way of example.

<Preparation Example 1> Preparation of coating solution

100 parts by weight of an emulsion-type thermoplastic polyurethane resin (polyether type dissolved in an aromatic one-component methyl ethyl ketone having a solid content of 30% by weight) 31 parts by weight of a mixed solvent in which methyl ethyl ketone and toluene are mixed in a weight ratio of 1:1 After addition, 2 parts by weight of a water repellent and 2 parts by weight of a slip agent were added and stirred, and then left for 22 hours, and 2 parts by weight of a crosslinking agent was mixed to prepare a coating solution.

<Preparation Example 2> Preparation of the base layer

The coating solution prepared in Preparation Example 1 was uniformly coated on a release paper to a thickness of 40 μm with a comma knife, and then dried with a hot air dryer to prepare a base layer.

<Preparation Example 3> Preparation of base layer

The coating solution prepared in Preparation Example 1 was uniformly applied to a release paper to a thickness of 60 μm with a comma knife, and then dried with a hot air dryer to prepare a base layer.

<Preparation Example 4> Preparation of base layer

The coating solution prepared in Preparation Example 1 was uniformly applied to a release paper to a thickness of 80 μm with a comma knife, and then dried with a hot air dryer to prepare a base layer.

<Example 1>

A non-swelling pore-type breathable waterproof film was obtained by laminating a polyethylene terephthalate knitted fabric coated with a hot melt adhesive and laminating it using a hot melt laminating machine, showing a thickness of 30 μm on both sides of the base layer prepared in Preparation Example 2 A high heat-resistance medical sheet was manufactured.

<Example 2>

A non-swelling pore-type breathable and waterproof film was obtained through the process of laminating a polyethylene terephthalate knitted fabric coated with a hot melt adhesive and laminating it using a hot melt laminating machine, showing a thickness of 20 μm on both sides of the base layer prepared in Preparation Example 3 A high heat-resistance medical sheet was manufactured.

<Example 3>

A non-swelling pore-type breathable and waterproof film was obtained by laminating a polyethylene terephthalate knitted fabric coated with a hot melt adhesive and laminating it using a hot melt laminating machine, showing a thickness of 10 μm on both sides of the base layer prepared in Preparation Example 4 A high heat-resistance medical sheet was manufactured.

<Comparative Example 1>

A non-swelling pore-type breathable and waterproof film was obtained by laminating a polyethylene terephthalate film having a thickness of 30 μm on both sides of the base layer prepared in Preparation Example 2, and laminating a polyethylene terephthalate film coated with a hot melt adhesive, and laminating it using a hot melt laminating machine. A high heat-resistance medical sheet was manufactured.

<Comparative Example 2>

A non-swelling pore-type breathable and waterproof film was obtained through the process of laminating a polyethylene terephthalate film coated with a hot melt adhesive and laminating it using a hot melt laminating machine, showing a thickness of 20 μm on both sides of the base layer prepared in Preparation Example 3 A high heat-resistance medical sheet was manufactured.

<Comparative Example 3>

A non-swelling pore-type breathable and waterproof film was obtained by laminating a polyethylene terephthalate film coated with a hot melt adhesive and laminating it using a hot melt laminating machine, showing a thickness of 10 μm on both sides of the base layer prepared in Preparation Example 4 A high heat-resistance medical sheet was manufactured.

The moisture permeability, moisture permeability resistance and water resistance of the high heat-resistant medical sheet using the non-swelling pore-type breathable waterproof film prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were measured and shown in Table 1 below.

{However, the moisture permeability was measured using the potassium acetate method, the moisture permeability resistance was measured using the ISO 11092-2014, and the water resistance was measured using the ISO-0811 test method.}

<Table 1>

As shown in Table 1, the high heat-resistant medical sheet using the non-swelling pore-type breathable waterproof film prepared through Examples 1 to 3 of the present invention has a moisture permeability of 30,000 or more, and a moisture permeability resistance of less than 10, and water resistance is found to be excellent.

Therefore, the high heat-resistant medical sheet using the non-swelling pore-type breathable and waterproof film according to the present invention and its manufacturing method do not have swelling, have excellent heat resistance, so can be sterilized and washed at high temperature, and have excellent water resistance and breathability. to provide.

10 ; base layer
20 ; surface layer
S101; Polyurethane coating solution manufacturing step
S103; Base layer forming step
S105 ; surface layer lamination step
S107; Lamination step

Claims (8)

a base layer made of microporous polyurethane; and
A high heat-resistant medical sheet using a non-swelling pore-type breathable and waterproof film, characterized in that it consists of a surface layer formed on both sides of the base layer.
The method according to claim 1,
The base layer is a high heat-resistant medical sheet using a non-swelling pore-type breathable waterproof film, characterized in that it has a pore size of 0.1 to 5㎛.
The method according to claim 1,
The base layer is a high heat-resistant medical sheet using a non-swellable pore-type breathable waterproof film, characterized in that it has a thickness of 40 to 80㎛.
The method according to claim 1,
The surface layer is a high heat-resistant medical sheet using a non-swellable pore-type breathable and waterproof film, characterized in that made of polyethylene terephthalate knitted fabric having a thickness of 10 to 30 μm.
The method according to claim 1,
The high heat-resistance medical sheet using the non-swellable pore-type breathable and waterproof film has water resistance of 10,000 mmH ₂ O or more, and the water vapor permeability by the potassium acetate method is 30,000 g/m²·day or more, and the moisture permeability resistance is 10 m².pa A high heat-resistant medical sheet using a non-swelling pore-type breathable and waterproof film, characterized in that /w or less.
6. The method according to any one of claims 1 to 5,
The high heat-resistant medical sheet using the non-swelling pore-type breathable waterproof film is a high heat-resistant medical sheet using a non-swelling pore-type breathable waterproof film, characterized in that it is used as a surgical gown or surgical cloth.
A polyurethane coating solution manufacturing step of preparing a coating solution comprising a composition containing an emulsion-type thermoplastic polyurethane resin;
a base layer forming step of applying the coating solution prepared through the polyurethane coating solution manufacturing step to a release paper, drying the release paper, and forming a base layer;
a surface layer lamination step of laminating a polyethylene terephthalate knitted fabric on both sides of the base layer prepared through the base layer forming step; and
A method of manufacturing a high heat-resistant medical sheet using a non-swelling pore-type breathable and waterproof film, characterized in that it consists of; a laminating step of laminating the laminate manufactured through the surface layer lamination step.
8. The method of claim 7,
The coating solution consists of 100 parts by weight of an emulsion-type thermoplastic polyurethane, 70 to 90 parts by weight of a solvent, 1 to 3 parts by weight of a non-yellowing crosslinking agent, 1 to 3 parts by weight of a water repellent, and 1 to 3 parts by weight of a slip agent,
The solvent is a method of manufacturing a high heat-resistant medical sheet using a non-swellable pore-type breathable and waterproof film, characterized in that consisting of methyl ethyl ketone, toluene and water.

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