Anti-aging essential oil patch and preparation method thereof

Abstract

The invention discloses an anti-aging essential oil patch and a preparation method thereof.The essential oil patch comprises a non-woven fabric, a bonding layer, an anti-seepage layer, an organic silica gel bonding layer and a release film which are sequentially stacked, essential oil is loaded on the non-woven fabric, the anti-seepage layer is connected with the bonding layer through melting and hot pressing, the anti-seepage layer is made of PET and can resist oil, dilute acid and dilute alkali, and the anti-aging essential oil patch is good in anti-aging effect and good in anti-aging effect. Good essential oil permeation prevention performance is achieved, and direct contact between the essential oil and the organic silicon gel adhesive layer is avoided. When PET cannot completely prevent essential oil from permeating, or the essential oil is volatilized and dissolved in an organic silicon gel adhesive layer, due to the fact that organic silicon gel is formed by connecting macromolecules through silicon-oxygen bonds, high-temperature resistance, aging resistance and solvent resistance can be achieved, a three-dimensional cross-linked network structure is formed through hydrogenation addition reaction, and the mechanical property of the film is improved. According to the essential oil patch, the organic silicon gel adhesive layer in which essential oil is dissolved still has good cohesion, so that the essential oil patch still has relatively high viscosity in a long-term storage process.

Description

Technical Field

[0001] The invention relates to the field of essential oil patch products, and in particular to an aging-resistant essential oil patch and a preparation method thereof. Background Art

[0002] Essential oil patches are products that work through the volatility of essential oils themselves. Essential oil patches currently on the market are usually composed of non-woven fabrics, adhesive layers, and release films stacked in sequence. The non-woven fabric is used to carry the essential oils, the adhesive layer is used to stick the essential oil patches on the human body or clothing, and the release film is used to protect the adhesive layer before the essential oil patches are used. In the prior art, the adhesive layer is usually an acrylate or synthetic rubber hot-melt pressure-sensitive adhesive, and essential oils are a highly soluble mixed organic solvent. During the transportation of the essential oil patches, the essential oils on the non-woven fabric will penetrate or evaporate into the adhesive layer, causing the adhesive layer to dissolve, reducing the viscosity of the adhesive layer, causing the essential oil patches to fall off easily during use, and the dissolution of the adhesive layer will cause the adhesive to remain on the clothing, making it difficult to clean. In order to solve the above problems, a kind of essential oil patch has appeared on the market, in which an impermeable layer is provided between the non-woven fabric and the adhesive layer to reduce the penetration of essential oils into the adhesive layer.

[0003] For example, Chinese patent publication number CN114515306A discloses a nasal essential oil patch, which includes an essential oil loading layer, an impermeable membrane, and an acrylic adhesive, wherein the impermeable membrane is a polyethylene film (PE), which has a limited effect on blocking essential oils. During long-term storage of the essential oil patch, the essential oil will still penetrate the PE and acrylic adhesives, resulting in loss of adhesion and residual adhesive on the essential oil patch.

[0004] In view of this, the present invention provides an aging-resistant essential oil patch and a preparation method thereof to solve the above problems. Summary of the invention

[0005] In order to overcome the deficiencies of the above-mentioned technologies, the present invention provides an aging-resistant essential oil patch which can maintain high viscosity during long-term storage.

[0006] The invention discloses an aging-resistant essential oil patch, comprising a non-woven fabric, an adhesive layer, an anti-seepage layer, a silicone gel adhesive layer and a release film which are stacked in sequence, wherein the non-woven fabric is loaded with essential oil, the anti-seepage layer is PET, and the anti-seepage layer is connected to the adhesive layer by melting and hot pressing.

[0007] Preferably, the anti-seepage layer has a thickness of 10 to 100 μm.

[0008] Preferably, the anti-seepage layer is formed by coating silicone gel to form an organic silicone gel adhesive layer, and the coating amount of the organic silicone gel is 60 to 300 g / m 2 .

[0009] Preferably, the non-woven fabric is coated with PE or PUR to form an adhesive layer.

[0010] Preferably, the coating amount of PE or PUR is 15 to 30 g / m 2 .

[0011] Preferably, the weight of the nonwoven fabric is 50 to 200 g / m2. 2 The nonwoven fabric has an essential oil loading of 10 to 50 g / m 2 .

[0012] Preferably, the release film is one of a fluorine release film, a PE film, and a non-silicon release paper.

[0013] The present invention further provides a method for preparing an aging-resistant essential oil patch, comprising the following steps:

[0014] Step 1: overlap one side of the adhesive layer of the non-woven fabric with the anti-seepage layer and heat-press them so that the adhesive layer is connected to the anti-seepage layer;

[0015] Step 2: coating the organic silicone gel on the anti-seepage layer, and then curing the organic silicone gel so that the anti-seepage layer forms an organic silicone gel adhesive layer;

[0016] Step 3: Cover the release film on the silicone gel adhesive layer to obtain the essential oil patch substrate;

[0017] Step 4: Load the essential oil onto the non-woven fabric and then seal it.

[0018] Preferably, in step 1, the hot pressing temperature of the adhesive layer and the anti-seepage layer is 100-130°C.

[0019] Preferably, in the step 2, the curing temperature of the silicone gel is 90-130° C., and the curing time is 3-10 minutes.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The anti-seepage layer of the present invention is PET, which is resistant to oil, dilute acid, dilute alkali and most solvents, has good resistance to essential oil penetration, and avoids direct contact between essential oil and silicone gel adhesive layer. When PET cannot completely prevent the penetration of essential oil, or the essential oil volatilizes and dissolves into the silicone gel adhesive layer, since the silicone gel is formed by connecting polymers through silicon oxygen bonds, it is resistant to high temperature, aging and solvents, and forms a three-dimensional cross-linked network structure through hydrogenation addition reaction, which can make the silicone gel adhesive layer containing essential oil still have good cohesion, so that the essential oil can still maintain high viscosity during long-term storage.

[0022] 2. The adhesive layer is PE or PUR, which can not only connect the non-woven fabric, adhesive layer and anti-seepage layer into one body through melting and hot pressing, but also be tightly connected. Moreover, PE and PUR are solvent-resistant. During the essential oil penetration process, PE and PUR will not react with the essential oil, ensuring that the non-woven fabric and the anti-seepage layer can be firmly connected, and the adhesive layer can further separate the silicone gel adhesive layer from the non-woven fabric, making it difficult for the essential oil in the non-woven fabric to penetrate into the silicone gel adhesive layer.

[0023] 3. The anti-seepage layer is PET, and the thickness of the anti-seepage layer is 10-100 μm, which increases the stiffness of the essential oil patch and makes it less likely to wrinkle or deform. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the anti-aging essential oil patch of the present invention. DETAILED DESCRIPTION

[0025] The features of the present invention and other related features are further described in detail below through embodiments to facilitate understanding by those skilled in the art:

[0026] like Figure 1 As shown, an embodiment of the present invention provides an aging-resistant essential oil patch, comprising a non-woven fabric 1, an adhesive layer 2, an anti-seepage layer 3, a silicone gel adhesive layer 4, and a release film 5 stacked in sequence, the non-woven fabric 1 is loaded with essential oil, the anti-seepage layer 3 is PET, and the anti-seepage layer 3 is connected to the adhesive layer 2 by melt hot pressing, so that the non-woven fabric 1, the adhesive layer 2, and the anti-seepage layer 3 are tightly connected into one.

[0027] In some embodiments, the thickness of the PET anti-seepage layer 3 is 10-100 μm, which can increase the stiffness of the essential oil patch and make it less likely to wrinkle or deform.

[0028] In some embodiments, the anti-seepage layer 3 is formed by coating silicone gel to form an organic silicone gel adhesive layer 4, and the coating amount of the organic silicone gel is 60 to 300 g / m 2 , which can make the essential oil sticker have better adhesion and not be too strong, so as to ensure that the essential oil sticker is firmly attached to the clothing and is also convenient for tearing off when the essential oil sticker loses its effectiveness.

[0029] In some embodiments, the non-woven fabric 1 is coated with PE or PUR to form an adhesive layer 2. PE and PUR are solvent-resistant. During the penetration of essential oils, PE and PUR will not react with the essential oils, thereby ensuring that the non-woven fabric 1 and the waterproof layer 3 can be firmly connected. In addition, the adhesive layer 2 can further separate the silicone gel adhesive layer 4 from the non-woven fabric 1, so that the essential oil on the non-woven fabric 1 is not easy to penetrate into the silicone gel adhesive layer 4.

[0030] In some embodiments, the coating amount of PE or PUR is 15 to 30 g / m 2 .

[0031] In some embodiments, the weight of the nonwoven fabric 1 is 50 to 200 g / m2. 2 The nonwoven fabric 1 has an essential oil loading of 10 to 50 g / m 2 The larger the weight of the non-woven fabric per gram, the higher the upper limit of the essential oil loading.

[0032] In some embodiments, the release film 5 is one of a fluorine release film, a PE film, and a non-silicon release paper. Before the essential oil patch is used, the release film is used to protect the silicone gel adhesive layer 4.

[0033] The embodiment of the present invention also provides a method for preparing an anti-aging essential oil patch, comprising the following steps:

[0034] Step 1: overlap one side of the adhesive layer of the non-woven fabric with the anti-seepage layer and heat-press them so that the adhesive layer is connected to the anti-seepage layer;

[0035] Step 2: coating the organic silicone gel on the anti-seepage layer, and then curing the organic silicone gel so that the anti-seepage layer forms an organic silicone gel adhesive layer;

[0036] Step 3: Cover the release film on the silicone gel adhesive layer to obtain the essential oil patch substrate;

[0037] Step 4: Load the essential oil onto the non-woven fabric and then seal it.

[0038] In some embodiments, the hot pressing temperature of the adhesive layer and the anti-seepage layer in step 1 is 100-130° C. to avoid overheating, yellowing, burning and other undesirable conditions of the adhesive layer and the anti-seepage layer.

[0039] In some embodiments, the curing temperature of the silicone gel in step 2 is 90-130° C., and the curing time is 3-10 min.

[0040] Example 1

[0041] Embodiment 1 of the present invention provides an anti-aging essential oil patch, which is prepared by the following steps:

[0042] Step 1: The weight is 180g / m 2 One side of the non-woven fabric is coated with PE, and the coating amount of PE is 20g / m 2 Then, the PE side of the laminated nonwoven fabric was laminated with a 25 μm thick PET film and hot pressed at 120° C. to obtain a three-layer composite backing material.

[0043] Step 2: Use a scraper to apply Wacker silicone gel (organic silicone gel) on the PET film. The coating amount of Wacker silicone gel is 200±5g / m 2The three-layer composite backing material coated with Wacker silicone gel was placed in a 120°C forced air oven and heated for 5 minutes, and the Wacker silicone gel was cured to form an organic silicone gel adhesive layer.

[0044] Step 3: Apply the fluorine release film silicone gel adhesive layer to obtain the essential oil patch base material.

[0045] Step 4: Cut the essential oil patch substrate into 2.5cm x 15cm strips, and drip the essential oil on the non-woven fabric. The amount of essential oil dripped is 40±0.2g / m 2 Finally, put the essential oil patch into the aluminum-plastic sealed packaging bag.

[0046] Comparative Example 1

[0047] Comparative Example 1 of the present invention provides an essential oil patch. The adhesive layer of the essential oil patch of Comparative Example 1 is acrylic adhesive, and the rest is the same as the essential oil patch of Example 1.

[0048] Comparative Example 2

[0049] Comparative Example 2 of the present invention provides an essential oil patch, which is the same as the essential oil patch of Example 1 except that Comparative Example 2 does not have a PET film. Other aspects are the same as those of the essential oil patch of Example 1.

[0050] Aging test

[0051] Four essential oil patches of Example 1, four essential oil patches of Comparative Example 1, and four essential oil patches of Comparative Example 2 were independently packaged in aluminum-plastic sealed packaging bags, and then placed in an aging box with the aging temperature set to 70±2°C. Samples were then taken at 0 days, 3 days, 5 days, 7 days, and 15 days, respectively. The steel plate peeling force of the essential oil patches after aging was tested in accordance with GB / T2792-2014 standard, and the aging resistance of the essential oil patches was judged accordingly.

[0052] Table 1 Changes in the peeling force of the steel plate of the essential oil patch samples during aging

[0053] Example 1 Comparative Example 1 Comparative Example 2 (25℃) 0-day steel plate peeling strength (N / inch) 1.55 7.98 1.54 Peel strength of steel plate aged at 70℃ for 3 days (N / inch) 1.28 4.70 1.07 70℃ aging for 5 days Steel plate peeling strength (N / inch) 1.16 1.12 1.04 70℃ aging for 7 days Steel plate peeling strength (N / inch) 1.05 0.27 1.03 70℃ aging for 15 days Steel plate peeling strength (N / inch) 1.04 0.05 1.02

[0054] Test results analysis

[0055] (1) From the data in Table 1, it can be seen that the steel plate peeling force of the essential oil patch of Example 1 before aging is 1.55 N / inch. After aging for 15 days at 70°C (simulating the aging of the essential oil patch at room temperature for 3 months), the steel plate peeling force of the essential oil patch is 1.04 N / inch, that is, the essential oil patch still maintains 67% of the initial viscosity. The steel plate peeling force of the essential oil patch of Comparative Example 1 before aging is 7.98 N / inch. After aging for 15 days at 70°C, the steel plate peeling force of the essential oil patch is 0.05 N / inch, that is, the viscosity of the essential oil patch is 0.6% of the initial value, and the steel plate peeling force of the essential oil patch of Comparative Example 1 is close to 0, almost losing viscosity, because the essential oil can dissolve the acrylic glue to a viscosity close to 0.

[0056] From the comparison between Example 1 and Comparative Example 1, it can be seen that the present invention uses silicone gel as the adhesive layer, which can make the essential oil patch maintain a relatively high viscosity during long-term storage. This is because 1. The chemical properties of silicone gel are stable and will not react with essential oils. 2. In addition, silicone gel has a three-dimensional cross-linked network structure and has good cohesive force. Even if the essential oil penetrates into the silicone gel, it will only cause the silicone gel to swell. Under the action of cohesive force, the silicone gel will not dissolve. 3. The amount of essential oil dissolved by silicone gel is limited. Therefore, after the seventh day of aging, the steel plate peeling force of the essential oil patch of Example 1 has not decreased significantly. Therefore, it is speculated that the essential oil patch of Example 1 can maintain a relatively high viscosity during long-term storage.

[0057] (2) By comparing Example 1 and Comparative Example 2, it can be seen that the essential oil patch of Comparative Example 2 does not have a PET film, and the essential oil of the non-woven fabric can easily penetrate into the silicone gel, so that the viscosity of the essential oil patch of Comparative Example 2 decreases faster than that of Example 1. However, the adhesive layer of the essential oil patch of Comparative Example 2 is silicone gel, so after 15 days of aging, the essential oil patch still maintains 66% of the initial viscosity.

[0058] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An anti-aging essential oil patch, characterized in that: The invention comprises a non-woven fabric (1), an adhesive layer (2), an impermeable layer (3), an organic silicone gel adhesive layer (4), and a release film (5) which are stacked in sequence. The non-woven fabric (1) is loaded with essential oil, the impermeable layer (3) is PET, and the impermeable layer (3) is connected to the adhesive layer (2) by melting and hot pressing.

2. The anti-aging essential oil patch according to claim 1, characterized in that: The anti-seepage layer (3) has a thickness of 10 to 100 μm.

3. The anti-aging essential oil patch according to claim 1, characterized in that: The anti-seepage layer (3) is coated with silicone gel to form an organic silicone gel adhesive layer (4), and the coating amount of the organic silicone gel is 60 to 300 g / m 2 .

4. The anti-aging essential oil patch according to claim 1, characterized in that: The nonwoven fabric (1) is coated with PE or PUR to form an adhesive layer (2).

5. The anti-aging essential oil patch according to claim 4, characterized in that: The coating amount of PE or PUR is 15-30g / m 2 .

6. The anti-aging essential oil patch according to claim 1, characterized in that: The nonwoven fabric (1) has a gram weight of 50 to 200 g / m2 per square meter. 2 The nonwoven fabric (1) carries 10 to 50 g / m2 of essential oil. 2 .

7. The anti-aging essential oil patch according to claim 1, characterized in that: The release film (5) is one of a fluorine release film, a PE film, and a non-silicon release paper.

8. A method for preparing the anti-aging essential oil patch according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: overlapping one side of the adhesive layer (2) of the non-woven fabric (1) with the anti-seepage layer (3) and hot pressing them so that the adhesive layer (2) and the anti-seepage layer (3) are connected; Step 2: coating the organic silicone gel on the anti-seepage layer (3), and then curing the organic silicone gel so that the anti-seepage layer (3) forms an organic silicone gel adhesive layer (4); Step 3: Covering the release film (5) on the silicone gel adhesive layer (4) to obtain an essential oil patch substrate; Step 4: Load the essential oil onto the non-woven fabric (1) and then seal it.

9. The method for preparing an anti-aging essential oil patch according to claim 7, characterized in that: In the step 1, the hot pressing temperature of the adhesive layer (2) and the anti-seepage layer (3) is 100-130°C.

10. The method for preparing an anti-aging essential oil patch according to claim 7, characterized in that: In the step 2, the curing temperature of the silicone gel is 90-130° C., and the curing time is 3-10 minutes.

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