阅读说明：本技术 水胶体组合物和包含该水胶体组合物的生物贴片 (Hydrocolloid composition and biological patch comprising same ) 是由 金泰源 于 2018-12-21 设计创作，主要内容包括：提供了水胶体组合物和包含所述水胶体组合物的生物贴片。所述水胶体组合物具有疏水性弹性体基质。水胶体颗粒和气凝胶颗粒分散在所述基质中。所述气凝胶颗粒可以是二氧化硅气凝胶颗粒。所述气凝胶颗粒可包括具有在颗粒表面上形成有疏水性官能团的颗粒。所述气凝胶颗粒可以是疏水性气凝胶颗粒,在颗粒表面上同时形成疏水性官能团和亲水性官能团的杂化气凝胶颗粒,或者是所述疏水性气凝胶颗粒,所述杂化气凝胶颗粒和亲水性气凝胶颗粒的混合物。(Hydrocolloid compositions and biological patches comprising the hydrocolloid compositions are provided. The hydrocolloid composition has a hydrophobic elastomer matrix. Hydrocolloid particles and aerogel particles are dispersed in the matrix. The aerogel particles can be silica aerogel particles. The aerogel particles may include particles having hydrophobic functional groups formed on the surface of the particles. The aerogel particles can be hydrophobic aerogel particles, hybrid aerogel particles that form both hydrophobic and hydrophilic functional groups on the surface of the particles, or a mixture of the hydrophobic aerogel particles, the hybrid aerogel particles, and the hydrophilic aerogel particles.)

1. A hydrocolloid composition comprising:

a hydrophobic elastomer matrix; and

hydrocolloid particles and aerogel particles dispersed in the matrix.

2. The hydrocolloid composition of claim 1 wherein the hydrocolloid composition comprises 100 parts by weight of the hydrophobic elastomer, 70-150 parts by weight of the hydrocolloid particles and 1-15 parts by weight of the aerogel particles.

3. The hydrocolloid composition of claim 1 wherein the hydrophobic elastomer is a styrene-isoprene-styrene triblock copolymer (SIS).

4. The hydrocolloid composition of claim 1, wherein the hydrocolloid particles are alginate crosslinked by calcium ions.

5. The hydrocolloid composition of claim 1, wherein the aerogel particles are silica aerogel particles.

6. The hydrocolloid composition of claim 1 or 5, wherein the aerogel particles have particles that form hydrophobic functional groups on the surface of the particles.

7. The hydrocolloid composition of claim 6 wherein the aerogel particles are hydrophobic aerogel particles, hybrid aerogel particles that simultaneously form hydrophobic and hydrophilic functional groups on the particle surface, or a mixture of the hydrophobic aerogel particles, the hybrid aerogel particles, and hydrophilic aerogel particles.

8. The hydrocolloid composition of claim 1 further comprising a pressure sensitive adhesive and/or a plasticizer.

9. A biological patch includes a hydrocolloid sheet having a hydrophobic elastomer matrix and hydrocolloid and aerogel particles dispersed within the matrix.

10. The biological patch of claim 9, further comprising:

an adhesive layer which is a pressure-sensitive adhesive layer disposed on the upper surface of the hydrocolloid sheet; and/or

A base layer which is a moisture-permeable waterproof film disposed on the lower surface of the hydrocolloid sheet.

11. The biological patch of claim 9, wherein the hydrocolloid sheet comprises 100 parts by weight of the hydrophobic elastomer, 70-150 parts by weight of the hydrocolloid particles, and 1-15 parts by weight of the aerogel particles.

12. The biological patch of claim 9, wherein the hydrophobic elastomer is styrene-isoprene-styrene triblock copolymer (SIS).

13. The biological patch of claim 9, wherein the hydrocolloid particles are alginate crosslinked by calcium ions.

14. The biological patch of claim 9, wherein the aerogel particles are silica aerogel particles.

15. The biological patch according to claim 9 or 14, wherein the aerogel particles have particles forming hydrophobic functional groups on the surface of the particles.

16. The biological patch of claim 15, wherein the aerogel particles are hydrophobic aerogel particles, hybrid aerogel particles that simultaneously form hydrophobic and hydrophilic functional groups on the surface of the particles, or a mixture of the hydrophobic aerogel particles, the hybrid aerogel particles, and hydrophilic aerogel particles.

17. The biological patch of claim 9, wherein the hydrocolloid sheet further comprises a pressure sensitive adhesive and/or a plasticizer.

Technical Field

Embodiments of the present invention relate to a bio-patch, and more particularly, to a bio-patch in the form of a hydrocolloid.

Background

Methods of protecting and treating wounds, including drug therapy, also known as dressings, can be divided into dry-environment gauze dressings and occlusive wet dressings. In the case of gauze dressing in a dry environment, moisture is evaporated and removed through the gauze, and thus there is a disadvantage in that a crust is formed on the wound to prevent the regenerated epithelial cells from smoothly moving along the wound surface, thereby leaving scars. In contrast, in the case of an enclosed wet dressing, the wound is prevented from drying and is placed in a wet state to smoothly recover the wound.

Occlusive moist dressings can be classified as semipermeable membrane dressings, foam dressings or hydrocolloid dressings, which can be used alone depending on the amount of wound exudate. In hydrocolloid dressings, the hydrophilic molecules absorb exudate from the wound, but the extent of exudate absorption is limited, and therefore, if a large amount of exudate occurs, the dressing needs to be changed frequently. In addition, since moisture permeability and waterproof function are still insufficient, the existing hydrocolloid dressings may have problems of causing pain and odor due to delayed wound healing.

Disclosure of Invention

Technical problem

The invention aims to provide a hydrocolloid type biological patch capable of insulating heat.

Another problem to be solved by the present invention is to provide a hydrocolloid type biological patch having improved moisture permeability and water resistance.

Another problem to be solved by the present invention is to provide a hydrocolloid-type biological patch having improved exudate absorption capacity.

Technical scheme

One aspect of the present invention provides a hydrocolloid composition. The hydrocolloid composition comprises a hydrophobic elastomer matrix. A plurality of hydrocolloid particles and a plurality of aerogel particles dispersed in the matrix. The hydrocolloid composition may comprise 100 parts by weight of the hydrophobic elastomer, 70-150 parts by weight of the hydrocolloid particles and 1-15 parts by weight of the aerogel particles.

The hydrophobic elastomer may be a styrene-isoprene-styrene triblock copolymer (SIS). The hydrocolloid particles may be alginate crosslinked by calcium ions.

The aerogel particles can be silica aerogel particles. The aerogel particles can have particles that form hydrophobic functional groups on the surface of the particles. The aerogel particles can be hydrophobic aerogel particles, hybrid aerogel particles that form both hydrophobic and hydrophilic functional groups on the surface of the particles, or a mixture of the hydrophobic aerogel particles, the hybrid aerogel particles, and the hydrophilic aerogel particles.

The hydrocolloid composition may further comprise a binder and/or a plasticizer.

Another aspect of the present invention provides a biological patch. The biological patch includes a hydrocolloid sheet having a hydrophobic elastomer matrix and hydrocolloid and aerogel particles dispersed in the matrix. The bio-patch may further include an adhesive layer which is a hydrophilic adhesive layer disposed on the upper surface of the hydrocolloid sheet; and/or a base layer which is a moisture-permeable waterproof film disposed on the lower surface of the hydrocolloid sheet. The hydrocolloid sheet may comprise 100 parts by weight of the hydrophobic elastomer, 70-150 parts by weight of the hydrocolloid particles, and 1-15 parts by weight of the aerogel particles. The hydrocolloid sheet may further comprise a binder and/or a plasticizer.

Advantageous effects

As described above, according to the present invention, it is possible to provide a hydrocolloid type bio-patch which is insulated by containing highly porous aerogel. In addition, the moisture permeability and waterproof function of the hydrocolloid type bio-patch can be improved. In addition, the ability of the hydrocolloid-type bio-patch to absorb exudates can be improved.

However, the effects of the present invention are not limited to the above-described effects, and other effects not mentioned will be clearly understood from the following description by those skilled in the art.

Drawings

FIG. 1 is a schematic diagram showing a cross-section of a biological patch according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating a state in which a bio-patch according to an embodiment of the present invention is applied to a wound site;

FIGS. 3a to 3c are graphs illustrating the results of measurement of the powders obtained in aerogel preparations 1 to 3 by Fourier transform infrared spectroscopy (FT-IR spectroscopy), respectively;

fig. 4 is an image illustrating the degree of floatation in water of an aerogel powder (a) including a hybrid aerogel according to aerogel preparation example 2 and a mixed powder (b) of a hydrophilic aerogel according to aerogel preparation example 3 and a hydrophobic aerogel according to aerogel preparation example 1;

fig. 5 is a photograph of the bio-patch according to the bio-patch preparation example 1;

fig. 6 is a graph showing adhesive strength of the bio-patch according to the bio-patch preparation example 1;

fig. 7 is a photograph showing air permeability of the bio-patch according to the bio-patch preparation example 1.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order to describe the present invention in more detail. However, the present invention is not limited to the embodiments described herein, but may be embodied in other forms.

In the present specification, when describing "Cx to Cy", it is to be construed that the case of having the number of carbon atoms corresponding to all the integers between the carbon number X and the carbon number Y is also described. In the present specification, when "X to Y" are described, numerals corresponding to all integers between X and Y should be construed as being described together.

In the present specification, "aerogel" may refer to a gel in which a dispersion medium is a gas, particularly air, and may be a concept including aerogel and xerogel in a narrow sense.

Hydrocolloid composition

A hydrocolloid composition according to one embodiment of the invention comprises a hydrophobic elastomer matrix, and hydrocolloid and aerogel particles dispersed in the matrix. The hydrocolloid composition may include 100 parts by weight of the hydrophobic elastomer, 70 to 150 parts by weight of the hydrocolloid particles, and 1 to 15 parts by weight of the aerogel particles, but is not limited thereto, and may be variously selected according to the use of the composition.

The hydrophobic elastomer may be natural rubber, polyisoprene, polybutadiene, butyl rubber (e.g., isoprene and isobutylene copolymers) or halogenated butyl rubber, but is not limited thereto. In particular, the hydrophobic elastomer may be a styrene-isoprene-styrene triblock copolymer (SIS) or a mixture of polyisobutylene and SIS.

The hydrocolloid particles may be particles having a network structure in which hydrophilic polymers form three-dimensional crosslinks, and may exhibit a high water holding capacity. The three-dimensional crosslinks may be formed by physical bonding, such as hydrogen bonding, van der waals forces, or hydrophobic interactions; or a chemical bond, such as a covalent bond. The hydrophilic polymer constituting these hydrocolloid particles may be a natural hydrophilic polymer, such as pectin, gelatin, cellulose, in particular carboxymethyl cellulose (CMC), collagen, dextran, elastin, chitin, chitosan, sodium alginate; or synthetic hydrophilic polymers such as polyacrylic acid (PAA), polyvinyl alcohol, polyethylene glycol, polyvinylpyrrolidone, polyurethane, polyhydroxyethylmethacrylate, silicone; or a combination thereof. The hydrocolloid particle may further comprise a cross-linking agent for forming the hydrophilic polymer into a three-dimensional network structure, wherein the cross-linking agent may be calcium chloride, calcium sulfate, calcium nitrate, zinc chloride, zinc sulfate, ammonium persulfate or glutaraldehyde. The crosslinking agent is not limited thereto, and may also vary depending on the type of the hydrophilic polymer. In one example, the hydrocolloid particles may be alginate crosslinked by calcium ions.

The description of the aerogel particles will be described later.

The hydrocolloid composition may further comprise a pressure sensitive adhesive, which may be an elastomeric pressure sensitive adhesive, such as polyisobutylene, phenol modified terpenes, rosin esters, such as glycerol and pentaerythritol esters of rosin, non-elastomeric pressure sensitive adhesives including synthetic polyterpene adhesives, or a combination of two or more of these.

The hydrocolloid composition of the present invention may further comprise trace amounts of other ingredients, for example, pharmacologically active agents well known in the art, such as wound healing promoters, antibacterial agents, fragrances, deodorants and antioxidants.

Aerogel particles

The aerogel particles may be highly porous nanostructures with nano-sized pores, which are obtained by replacing the liquid in the gel structure with air, and may be silica aerogel particles.

The aerogel particles may have a size of 0.1 to 1000 μm, in particular, several to several tens of μm, for example, 1 to 40 μm. The surface area of the aerogel particles under the BET method can be 300-2000m²/g, in particular 500-²The aerogel particles can have a density of 0.03 to 0.5g/cc, a porosity of 70% to 99%, and a pore size of 5 to 50 nm.

The aerogel particles can have particles that form hydrophobic functional groups on the surface of the particles. The hydrophobic functional group may be disposed not only on the surface of the particle but also on the surface of the pores inside the particle. The hydrophobic functional group may be a functional group bonded to atoms constituting the aerogel particles, for example, a functional group bonded to Si atoms, and may be hydrogen, a C1-C18 linear or branched alkyl group, a siloxy group represented by the following chemical formula 1, or a combination thereof.

[ chemical formula 1]

*-OSiH_(3-n)R¹n

In chemical formula 1, R¹May be a linear or branched alkyl group of C1-C18, n may be an integer of 0-3, and x may represent a bond to Si in the aerogel particles.

When n is an integer of 1 to 3, the functional group represented by chemical formula 1 may be referred to as an alkylsiloxy group. The C1-C18 linear or branched alkyl groups can be C1-C6 linear alkyl groups, and the C1-C6 linear alkyl groups can be saturated linear alkyl groups, such as methyl, ethyl, n-propyl, n-butyl, n-pentyl, or n-hexyl. In one embodiment, the C1-C6 linear alkyl groups can be methyl or ethyl.

In one example, the aerogel particles can be hydrophobic aerogel particles having 80 mol% to 100 mol%, particularly 85 mol%, 90 mol%, 95 mol%, or even 99 mol% or more hydrophobic functional groups, based on the total functional groups on the surface of the particles. The particle surface may further comprise an intra-particle pore surface.

In another example, the aerogel particles can be hybrid aerogel particles having hydrophilic and hydrophobic functional groups on the surface of the particles. The particle surface may further comprise an inner pore surface of the particle.

In yet another example, the aerogel particles can be a mixture of hybrid aerogel particles, hydrophobic aerogel particles, and hydrophilic aerogel particles. Here, the hydrophilic aerogel particles can have from 80 mol% to 100 mol%, in particular 85 mol%, 90 mol%, 95 mol% or even 99 mol% or more of hydrophilic functional groups, based on the total functional groups on the particle surface. The particle surface may further comprise an intra-particle pore surface. The hydrophilic functional group may be bonded to atoms constituting the aerogel particles, for example, to Si atoms, and may also be a hydroxyl group (-OH). The mixture can comprise about 25-40 wt% hybrid aerogel particles, about 25-40 wt% hydrophilic aerogel particles, and about 25-40 wt% hydrophobic aerogel particles. In one embodiment, the hybrid aerogel particles, the hydrophilic aerogel particles, and the hydrophobic aerogel particles can be included in a weight ratio of 1:1: 1.

The hybrid aerogel particles can have a molar ratio of the hydrophobic functional groups to the hydrophilic functional groups on the surface of the hybrid aerogel particles of 7:3 to 3: 7.

Meanwhile, the hybrid aerogel particles, the hydrophilic aerogel particles, and the hydrophobic aerogel particles can be classified according to affinity to water. Specifically, when aerogel particles are placed in a container with water, the hydrophilic aerogel particles can sink to the bottom of the container, the hydrophobic aerogel particles can float on the water surface, and the hybrid aerogel particles can be submerged half way or just below the water surface.

The method of making the aerogel powder with hybrid aerogel particles can be as follows. However, it is not limited thereto. First, a hydrophobic aerogel powder can be prepared, and the hydrophobic aerogel powder can be heat treated to partially modify the outer surface of the particles provided in the powder and further modify the surface of the internal pores. Specifically, the hydrophobic surface functional groups of at least some of the particles provided in the hydrophobic aerogel powder can be changed to hydrophilic surface functional groups. Specifically, hydrophobic surface functional groups such as hydrogen, alkyl groups or siloxy groups, particularly siloxy groups, can be converted to hydroxyl groups by thermal treatment. At the same time, residual moisture in the aerogel powder can be at least partially or completely removed. The heat treatment of the hydrophobic aerogel powder may include a temperature-raising step of gradually raising the temperature of the hydrophobic aerogel powder, and a sintering step of holding the hydrophobic aerogel powder in a heated state for a predetermined time to perform sintering.

Thus, as described above, at least some of the particles of the aerogel powder can be converted into hybrid aerogel particles having a hydrophobic surface and a hydrophilic surface, and some other particles can be converted into hydrophilic aerogel particles having a hydrophilic surface, and some other particles can remain as hydrophobic aerogel particles that retain the hydrophobic surface. As a result, an aerogel powder comprising a mixture of all of the hydrophilic aerogel particles, the hydrophobic aerogel particles, and the hybrid aerogel particles can be obtained.

The heat treatment may be performed using an electric furnace, and may be performed in a state where the temperature is increased to 300-500 ℃ for 0.5-24 hours. In addition, the heat treatment may be performed in an oxidizing atmosphere, particularly an air atmosphere. When the heat treatment temperature or time is adjusted, only some of the hydrophobic surface functional groups in the hydrophobic aerogel may be changed to hydrophilic surface functional groups, or almost all of the hydrophobic surface functional groups in the hydrophobic aerogel may be changed to hydrophilic surface functional groups to form a hydrophilic aerogel. For example, only some of the hydrophobic surface functional groups in the hydrophobic aerogel can be changed to hydrophilic surface functional groups by heat treatment at about 345-355 ℃, particularly 347-353 ℃; and can be subjected to a heat treatment at 365 c, especially 357 363 c to form a hydrophilic aerogel wherein all hydrophobic surface functional groups of the hydrophobic aerogel have been changed to hydrophilic surface functional groups.

Biological adhesive sheet

Fig. 1 is a schematic view showing a cross-section of a bio-patch according to an embodiment of the present invention.

Referring to fig. 1, the bio-patch may include a hydrocolloid sheet 20 on a base layer 10, an adhesive layer 30 and a release layer 40. However, at least one of the base layer 10, the adhesive layer 30 and the release layer 40 may be omitted.

The base layer 10 may be a moisture-permeable waterproof film, and may be a porous polyethylene or polyurethane film. The base layer 10 can block water droplets and external pathogens, such as bacteria, and has a size larger than the micropores of the layer (waterproof property), while allowing water vapor and air to be transmitted through the micropores (moisture permeable property). The base layer 10 may have a thickness of about 10-100 μm.

The hydrocolloid sheet 20 may be formed by laminating the hydrocolloid composition described above onto the base layer 10. Specifically, after the hydrocolloid composition is extruded onto the base layer 10, it may be formed into a layer having a uniform thickness using a hot press, a roller, or the like, thereby forming the hydrocolloid sheet 20.

The hydrocolloid plate 20 may comprise a hydrophobic elastomer matrix 21. Hydrocolloid particles 22 and aerogel particles 23 may be dispersed in the hydrophobic elastomer matrix 21. Meanwhile, in the process of preparing the hydrocolloid composition, the hydrocolloid particles and the aerogel particles may be almost uniformly mixed in the hydrophobic elastomer matrix through a process of physically and uniformly mixing the hydrophobic elastomer, the hydrocolloid particles and the aerogel particles. Thus, the hydrocolloid plate 20 may comprise hydrocolloid particles 22 and aerogel particles 23 uniformly dispersed in the hydrophobic elastomer matrix 21.

The adhesive layer 30 is a layer that can provide adhesion so that the hydrocolloid sheet 20 can be brought into close contact with the skin. The adhesive layer 30 may be a pressure-sensitive adhesive layer, and specifically, may be a hydrophilic pressure-sensitive adhesive layer. The adhesive layer 30 may be, for example, a rosin ester layer, a silicone layer, or a composite layer thereof. However, the present invention is not limited thereto, and various materials used in the art may be used. The adhesive layer 30 may be formed to a very thin thickness of several micrometers.

The peel layer 40 is a layer that can be removed immediately prior to adhering the biological patch to the injured skin, and can be formed using a layer widely used in the art.

Fig. 2 is a schematic view illustrating a state in which a bio-patch according to an embodiment of the present invention is applied to a wound site.

Referring to fig. 2, a biological patch is applied to skin 100 where a wound 105 has occurred. The release layer 40 described with reference to fig. 1 may be removed from the biological patch and the adhesive layer 30 may be adhered to the skin 100 containing the wound 105. When the adhesive layer 30 is omitted, the hydrocolloid sheet 20 may be placed in direct contact with the wound.

The base layer 10 is a film exhibiting waterproofness and moisture permeability, which can transfer excessive moisture (B) from sweat of the skin 100 or exudate of the wound 105, remove odor by air permeation, and inhibit permeation of water droplets (C) and pathogens (D) from the outside.

Since the aerogel particles 23 dispersed in the hydrocolloid sheet 20 have a high porosity structure, they can contain air in the particles even in the hydrocolloid sheet 20, and thus can exhibit thermal insulation properties. The thermal insulating properties of aerogel particles 23 can maintain the temperature of the wound site at a suitable temperature or higher, thereby increasing the rate of wound healing.

In addition, air and water vapor can be transmitted through such aerogel particles 23 having a highly porous structure, so that the air permeability and moisture permeability of the hydrocolloid sheet 20 can be improved. As a result, excessive moisture (B) of sweat from the skin 100 or exudate from the wound 105 may be emitted to the outside through the hydrocolloid sheet 20 and the base layer 10, thereby keeping the wound site 105 clean and reducing odor.

However, the porous structure of the aerogel particles 23 is not large enough to penetrate water droplets or pathogens. In addition, since the hydrocolloid sheet 20 is provided with the hydrophobic elastomer matrix 21, it may have water repellency or water impermeability. Meanwhile, when the aerogel particles 23 have hydrophobic functional groups on the surfaces thereof, the water repellency or water impermeability of the hydrocolloid sheet 20 can be improved. In this case, it may be considered to omit the base layer 10.

In one example, the aerogel particles 23 can be hydrophobic aerogel particles having hydrophobic functional groups on a majority of the particle surface, and in another example, can be hybrid aerogel particles having hydrophilic functional groups and hydrophobic functional groups on the particle surface. In another example, the aerogel particles 23 can be a mixture of hydrophobic aerogel particles, hybrid aerogel particles, and hydrophilic aerogel particles.

When the aerogel particles 23 include hydrophobic functional groups on the surface, these aerogel particles 23 may not be disposed close to the hydrocolloid particles 22 due to the hydrophobic functional groups on the surface, and may be disposed at a distance from the hydrocolloid particles 22 exhibiting hydrophilicity. The distance or gap may be a passage through which excess moisture (B) from perspiration of the skin 100 or exudate of the wound 105 may pass. In addition, the distance or gap may provide free space for the hydrocolloid particles to swell. Swelling of hydrocolloid particles 22 may occur when hydrocolloid particles 22 absorb wound 105 exudate. In this case, even when the content of the hydrocolloid particles 22 in the hydrocolloid sheet 20 is increased, a free space in which the hydrocolloid particles 22 are sufficiently swollen can be provided, so that the absorption rate of the hydrocolloid sheet 20 can be greatly improved. This can solve the following problems: due to the limited absorption rate, conventional hydrocolloid-type dressings cannot be used when the wound exudate is excessive. In other words, the biological patch according to this embodiment can be used not only for light wounds with little exudate but also for deep and large wounds with much exudate.

When the aerogel particles 23 have hydrophilic functional groups on the surface, i.e., the aerogel particles 23 are hybrid aerogel particles or hydrophobic aerogel particles, a mixture of hybrid aerogel particles and hydrophilic aerogel particles, the hydrophilic functional groups of the aerogel particles 23 can provide hydrogen bonded to water vapor, thereby improving the moisture permeability of the hydrocolloid sheet 20. In addition, the aerogel particles 23 having hydrophilic functional groups on the surface can also exhibit absorption of exudate.

In the following, preferred examples are provided to aid understanding of the present invention. However, the following experimental examples are only for helping understanding of the present invention, and the present invention is not limited by the following experimental examples.

< aerogel production example 1>

2000g of water were mixed with 500g of sodium silicate Solution (SiO)₂6 wt%) and stirred at a rotation speed of 300rpm using an electric stirrer, 200ml of acetic acid was added thereto and mixed at a rotation speed of 600rpm using an electric stirrer for about 30 minutes to prepare a silicate solution. After the silicate solution was degassed in vacuum for about 10 minutes, it was filled in a rectangular frame made of PVC, and then a gelation reaction was performed for 1 hour to prepare a silica gel. Washing the silica gel with water vapor and ethanol in sequence to convert the silica gel to an alcogel, followed by hexane and trimethylTreating the surface of the alcohol gel with a mixed solution of chlorosilane (TMCS) to obtain a solution containing trimethylsiloxy (-OSi (CH) on the surface₃)₃) The silylated gel of (a). The obtained silylated gel was dried at a temperature of about 55 ℃ for about 15 hours under normal pressure and sintered at a temperature of about 230 ℃ for about 10 hours to obtain hydrophobic aerogel. Thereafter, the hydrophobic aerogel is pulverized into a powder to obtain a hydrophobic aerogel powder.

< aerogel production example 2>

The hydrophobic aerogel powder obtained from aerogel production example 1 was placed in an electric furnace in an oxidizing atmosphere and heated to 340 ℃, followed by sintering for 1 hour while maintaining the temperature.

< aerogel production example 3>

The hydrophobic aerogel powder obtained from aerogel production example 1 was placed in an electric furnace in an oxidizing atmosphere and heated to 350 ℃, and then sintered for 1 hour while maintaining the temperature.

< aerogel production example 4>

The hydrophobic aerogel powder obtained from aerogel production example 1 was placed in an electric furnace in an oxidizing atmosphere and heated to 360 ℃, followed by sintering for 1 hour while maintaining the temperature.

FIGS. 3a to 3c are graphs illustrating the measurement results of the powders obtained in aerogel preparations 2 to 4 by Fourier transform infrared spectroscopy (FT-IR spectroscopy), respectively.

Referring to FIG. 3a, it can be seen that the aerogel according to aerogel preparation example 2 showed Si-CH in addition to Si-O-Si groups inherent in silica₃This indicates that the aerogel is a hydrophobic aerogel having a hydrophobic surface.

Referring to FIG. 3b, it can be seen that the aerogel according to aerogel preparation example 3 shows Si-CH in addition to Si-O-Si groups inherent in silica₃Radicals and OH radicals, which indicates that the aerogel is a hybrid aerogel formed by partially modifying a hydrophobic surface to a hydrophilic surface through heat treatment.

Referring to FIG. 3c, it can be seen that the aerogel according to aerogel preparation example 4 except for being inherent in silicaShows OH groups in addition to the Si-O-Si groups of (A), and before surface modification, a corresponding Si-CH group is observed₃The peak of radicals disappeared completely, indicating that the aerogel is a hydrophilic aerogel formed by completely modifying a hydrophobic surface into a hydrophilic surface through heat treatment.

Fig. 4 is an image illustrating the degree of floatation of an aerogel powder comprising the hybrid aerogel according to aerogel preparation example 3 and a mixture of the hydrophilic aerogel according to aerogel preparation example 4 and the hydrophobic aerogel according to aerogel preparation example 2 in water.

Referring to fig. 4, it can be seen that in the case of the mixture (b) of the hydrophilic aerogel according to aerogel preparation example 4 and the hydrophobic aerogel according to aerogel preparation example 2, the hydrophobic aerogel floating on the water surface and the hydrophilic aerogel precipitated at the bottom of the beaker can be clearly distinguished. On the other hand, it can be seen that, in the case of the aerogel powder (a) containing the aerogel according to aerogel preparation example 3, the aerogel particles included about half of the hybrid aerogel particles submerged under the water surface, hydrophilic aerogel particles precipitated at the bottom of the beaker, and hydrophobic aerogel particles floating on the water surface.

In addition, referring to fig. 3b and 4 together, it can be assumed that the aerogel powder according to aerogel preparation example 3 includes Si — CH on the surface thereof together₃Hybrid aerogel of OH groups and radicals, hydrophilic aerogel having predominantly OH groups on its surface, and aerogel having predominantly Si-CH groups on its surface₃Based on hydrophobic aerogels.

In addition, as shown by each OH peak intensity in fig. 3b and 3c and the results of fig. 4, together, aerogel powder according to aerogel preparation example 3 can include 25-40 wt% hybrid aerogel particles, 25-40 wt% hydrophobic aerogel particles, and 25-40 wt% hydrophilic aerogel particles, and further show that these particles are mixed in a weight ratio of 1: 1.

< preparation example of Patch 1>

2.5kg of styrene-isoprene-styrene copolymer (SIS) was heated to 170 ℃ and the temperature was maintained for 20 minutes to liquefy. The liquefied styrene-isoprene-styrene copolymer was cooled to 120 ℃, and 2kg of polyisobutylene and 1.2kg of liquid paraffin were added thereto, followed by uniform mixing to prepare an elastomer mixture. The elastomer mixture was cooled to 90 ℃, and 4.3kg of sodium alginate, 100g of calcium chloride and 0.4kg of the hybrid aerogel powder according to aerogel preparation example 3 were added to the cooled mixture, followed by uniform mixing to prepare a hydrocolloid-elastomer mixture. The hydrocolloid mixture was extruded at 100 ℃ to make a nanoporous biological patch.

< preparation example 2 of Patch >

A nanoporous biosample was prepared in the same manner as in the biosample preparation example 1, except that 50g of calcium chloride and 40g of hydrophobic aerogel powder were used according to the aerogel preparation example 1.

Fig. 5 is a photograph of the bio-patch according to the bio-patch preparation example 1.

Referring to fig. 5, it can be seen that a light yellow bio-patch is formed.

< biosheet adhesion test example >

Measuring the adhesion of the bio-patch at a test evaluation facility using the method of ASTM D3330; and measured under a 20N load cell, a test speed of 300mm/min and a universal tester with attached SUS 304.

Fig. 6 is a graph showing adhesive strength of the bio-patch according to the bio-patch preparation example 1.

Referring to FIG. 6, the bio-patch according to bio-patch preparation example 1 exhibited a pressure-sensitive adhesive force of 2.31N/25mm on average.

< examples of moisture permeability and absorption test of Patch >

The moisture permeability of the bio-patch was measured according to EN 13726-2 standard, and the absorbance was measured according to EN 13726-1 standard.

Table 1 below is a comparative table comparing the performance of the bio-patch according to the bio-patch preparation example 2 and the hydrocolloid dressing product. Here, the hydrocolloid dressing product does not contain aerogel.

TABLE 1

Referring to table 1, the bio-patch according to bio-patch preparation example 2 has an increased moisture permeability of about 5 times and an increased exudate absorption rate of about 6 times, despite an increased thickness, when compared to a hydrocolloid dressing not including aerogel.

< example of air permeability test of Patch >

After the bio-patch was placed in the tester, it was checked whether air permeated to the top of the bio-patch through the bio-patch while air was introduced under the bio-patch at a constant pressure.

Fig. 7 is a photograph showing air permeability of the bio-patch according to the bio-patch preparation example 1.

Referring to fig. 7, the bio-patch according to the bio-patch preparation example 1 was swollen by the inflow of air, and since a large amount of air bubbles were generated at the top of the bio-patch, it was confirmed that the air permeability was very excellent.

The present invention has been described in detail with reference to the preferred embodiments, but the present invention is not limited to the above embodiments, and those skilled in the art can make various modifications and changes within the spirit and scope of the present invention.