Breathable dotted adhesive tape and preparation method thereof

Abstract

The invention discloses a breathable dotted adhesive tape and a preparation method thereof, and relates to the field of adhesive tapes. The breathable dotted adhesive tape comprises a base material layer and a pressure-sensitive adhesive layer, the base material layer is obtained by weaving blended and intertwined yarns according to honeycomb weave to obtain base cloth and then treating the base cloth through a burnt-out process, the base material layer is provided with a concave area and a convex area, and the porosity of the base material layer is 10-50%; the pressure-sensitive adhesive layers are distributed in a dotted manner, and are only distributed in the concave areas of the base material layer to serve as ventilation channels of the dotted adhesive tape. The breathable point-shaped adhesive tape has good breathability, pasting stability and mechanical strength, normal breathing of skin and water evaporation are guaranteed, and better viscosity and durability can be obtained. In addition, a proper amount of drug sustained-release components can be doped into the pressure-sensitive adhesive layer, the drug sustained-release rate can be regulated and controlled, and the composite material is suitable for the fields of medical dressings and sports protection.

Description

Technical Field

[0001] The present application relates to the field of tapes, and in particular to a breathable dot-shaped tape and a preparation method thereof. Background Art

[0002] In the medical and sports fields, non-breathable tapes will limit the skin's breathing and moisture evaporation functions, not only increasing the allergic reaction of the products, but also reducing the service life and application effect. Therefore, the tape needs to have both good breathability and high adhesiveness, so as to meet the actual application requirements and ensure the comfort of the user after application.

[0003] Currently, there are mainly two conventional methods to make the tape breathable. One is to punch the finished tape, that is, to use a needle to poke out uniform or non-uniform small holes on the tape surface. This method has a low technical implementation difficulty, but there are obvious defects. When pressed, the adhesive surface is easy to stick, affecting the breathable effect of the tape. The other is to start from the coating of the adhesive. Specifically, it is divided into two methods: coating a glue surface with voids (there are voids without coating between the glue surfaces) and blowing holes on the sprayed tape (blowing the glue surface to form breathable holes). Among them, the blowing method has the best effect, can form a uniform glue surface and is breathable, but has extremely high requirements for production processes and equipment, and is difficult to popularize under the current technology and production conditions. The microporous coating method, although improving the breathability of the tape to a certain extent, due to the insufficient thickness of the pressure-sensitive adhesive layer for the formation of micropores, it is easy to cause the adhesive force of the tape to decrease and cannot well meet the actual use requirements. Summary of the Invention

[0004] To improve the contradiction that it is difficult to have both breathability and adhesiveness in traditional breathable tapes, the present application provides a breathable dot-shaped tape and a preparation method thereof.

[0005] In a first aspect, a breathable dot-shaped tape provided by the present application adopts the following technical solution: A breathable dot-shaped tape, comprising: A base material layer, which is obtained by weaving a blended interlaced yarn into a base fabric according to a honeycomb structure and then undergoing a burnout process. The base material layer has a concave area and a convex area, and the porosity of the base material layer is 10-50%; A pressure-sensitive adhesive layer, which is distributed in a dot shape, and the pressure-sensitive adhesive layer is only distributed in the concave area of the base material layer. There is no pressure-sensitive adhesive layer in the convex area of the base material layer, and the convex area serves as a breathable channel of the dot-shaped tape; Wherein, the blended interlaced yarn adopts at least one of a polyester-cotton blended yarn, a chemical fiber wrapped cotton core yarn, and a cotton-coated chemical fiber core-covered core yarn.

[0006] The base material layer of the breathable dot-shaped tape of the present application is obtained by weaving blended and intertwined yarns in a honeycomb structure and through a devoré process. Among them, the blended and intertwined yarns are selected from polyester-cotton blended yarns, chemical fiber wrapped cotton core yarns, or cotton coated chemical fiber core covered core yarns, which can lay the foundation for the subsequent devoré process and the mechanical strength of the product; the blended and intertwined yarns are woven in a honeycomb structure, so that the base material layer has a structure with both concave areas and convex areas. By controlling the base material layer through the devoré process to obtain a specific porosity, it provides the basis for the tape to achieve breathability, while ensuring the mechanical strength of the tape.

[0007] In addition, the pressure-sensitive adhesive layer of the breathable dot-shaped tape of the present application is only distributed in the concave areas and is distributed in dots. There is no pressure-sensitive adhesive layer in the convex areas, which does not adhere to the human body and can serve as a breathable channel, enabling the tape to have good breathability and ensuring the normal breathing and moisture evaporation of the skin. Since the breathable dot-shaped tape of the present application uses the convex areas of the base material layer as the breathable channels, there is no need to deliberately control the thickness of the pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive layer with a certain porosity to achieve the breathability of the tape. The thickness of the pressure-sensitive adhesive layer can be set according to requirements to ensure the paste stability of the tape. In addition, compared with the pressure-sensitive adhesive layer arranged flatly, the pressure-sensitive adhesive layer of the present application is arranged in the concave areas, with more and thicker adhesive amount. Under pressure, better adhesiveness and durability can be obtained.

[0008] That is, through the cooperation of the base material layer with a honeycomb structure and the dot-shaped distributed pressure-sensitive adhesive layer in the present application, the balance between high breathability and high paste stability can be achieved.

[0009] In some specific embodiments, the warp and weft yarns in the honeycomb structure are arranged alternately in thickness.

[0010] When preparing the base fabric with the warp and weft yarns arranged alternately in thickness, it is beneficial to strengthen the concave-convex contrast of the honeycomb structure of the base fabric, presenting a more distinct three-dimensional honeycomb texture with strong visual hierarchy. At the same time, it is beneficial to further improve the paste stability of the breathable dot-shaped tape.

[0011] Among them, the yarn count of the thick warp yarn is 40s - 60s, and the yarn count of the thin warp yarn is 90s - 100s.

[0012] The yarn count of the thick weft yarn is 40s - 60s, and the yarn count of the thin weft yarn is 90s - 100s.

[0013] In some specific embodiments, the thickness of the pressure-sensitive adhesive layer is 0.15 - 0.25 mm.

[0014] In the present application, the thickness of the pressure-sensitive adhesive layer is preferably controlled to be 0.15 - 0.25 mm. On the one hand, it can ensure the breathability of the tape while enabling the tape to obtain excellent paste stability. On the other hand, it is beneficial to save the cost of the pressure-sensitive adhesive layer.

[0015] In some specific embodiments, a drug sustained-release component is added to the pressure-sensitive adhesive layer.

[0016] In the present application, when incorporating the drug sustained-release component into the pressure-sensitive adhesive layer, the porosity of the substrate layer can be adjusted by the burnout process to control the drug release rate, and the tape can be used in the fields of medical dressings and sports protection.

[0017] In some specific embodiments, the drug sustained-release component includes, but is not limited to, ketoprofen microcapsules, antibacterial agents, and anti-inflammatory drugs.

[0018] In a second aspect, the preparation process of a breathable dot-shaped tape provided by the present application adopts the following technical solution: A preparation process of a breathable dot-shaped tape includes the following steps: Base fabric weaving: Weaving the blended interlaced yarns according to the honeycomb structure to obtain the base fabric; the blended interlaced yarns adopt at least one of polyester-cotton blended yarns, chemical fiber wrapped cotton core yarns, and cotton coated chemical fiber core covered yarns; Burnout process: Immerse the base fabric in an acid solution or an alkali solution for burnout treatment, then wash and dry the base fabric to obtain the substrate layer. In this step, the porosity of the substrate layer is controlled to be 10-50%; Adhesive scraping process: Scrape the pressure-sensitive adhesive onto the substrate layer, and the pressure-sensitive adhesive in the raised areas of the substrate layer is scraped off, and the pressure-sensitive adhesive fills the sunken areas of the substrate layer and forms the pressure-sensitive adhesive layer after curing.

[0019] Among them, the burnout process is selected according to the type of blended interlaced yarn used in the base fabric. Among them, for the burnout process of the polyester-cotton blended yarn, the cotton fibers on the polyester-cotton blended yarn are dissolved by an acid solution, or the polyester fibers on the polyester-cotton blended yarn are dissolved by an alkali solution; for the burnout process of the chemical fiber wrapped cotton core yarn or the cotton coated chemical fiber core covered yarn, an acid solution is used to dissolve the cotton fibers and retain the chemical fiber components.

[0020] In the present application, different burnout processes are adopted according to different yarn combinations of the base fabric. For blended yarns of chemical fiber and cotton or viscose cotton, such as blended yarns of polyester and cotton, since cotton is not resistant to acid but resistant to alkali, if treated with an acid solution, the cotton fibers will be dissolved and the overall fabric will become loose and porous; conversely, if an alkali solution is used, the polyester will be dissolved and the cotton fibers will be left. In either case, the overall breathability can be improved. For wrapped yarns (with chemical fiber wrapped outside and all cotton or rayon inside) and core covered yarns (with chemical fiber inside and cotton outside), it is preferred to use an acid solvent to dissolve the cotton fibers and leave loose chemical fibers or thin chemical fiber filaments.

[0021] Among them, the porosity = (1 - fabric density of the substrate layer after burnout treatment / fabric density of the substrate layer before burnout treatment) * 100%.

[0022] In some specific embodiments, the acid solution is a sulfuric acid solution.

[0023] In some specific embodiments, the alkali solution is at least one of a sodium hydroxide solution and a potassium hydroxide solution.

[0024] In some specific embodiments, in the coating process, a drug sustained-release component is added to the pressure-sensitive adhesive.

[0025] In some specific embodiments, the incorporation amount of the drug sustained-release component is 1-6% of the weight of the glue solution.

[0026] In some specific embodiments, in the burnout process, the porosity of the substrate layer is controlled at 20-45%.

[0027] The porosity of the substrate layer can regulate the release rate of the drug sustained-release component. Among them, the porosity is positively correlated with the drug release rate. Controlling the porosity of the substrate layer in the range of 20-45% in this application is beneficial to achieving a drug release half-life of 12-48 hours.

[0028] In some specific embodiments, the acid solution is preferably an acid solution with a mass concentration of 15-25%, and the alkali solution is preferably an alkali solution with a mass concentration of 15-25%.

[0029] In some specific embodiments, in the burnout process, the temperature is controlled at 45-55 °C, and the soaking time is 10-30 min.

[0030] By controlling the acid solution concentration or alkali solution concentration, as well as the burnout process temperature and soaking time in this application, it is beneficial to obtain a pore structure with uniform size, which is beneficial to the stable release of drugs.

[0031] In summary, this application at least includes the following beneficial technical effects: 1. The breathable dot-shaped tape of this application has good breathability, adhesion stability and mechanical strength, which not only ensures the normal breathing of the skin and the evaporation of moisture, but also can obtain better adhesiveness and durability.

[0032] 2. By controlling the acid solution concentration or alkali solution concentration, as well as the burnout process temperature and soaking time in this application, it is beneficial to obtain a pore structure with uniform size, which is beneficial to the stable release of drugs.

[0033] 3. The peeling strength of the traditional punched tape is 5-6 N / cm. The peeling strength of the breathable dot-shaped tape in this application can reach 7.3-8.2 N / cm. The breathable dot-shaped tape of this application has significant progress compared with the traditional punched tape. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1It is the honeycomb texture diagram of the base fabric in Embodiment 1 of the present application.

[0035] Figure 2 It is the structural schematic diagram of the base fabric in Embodiment 1 of the present application. Detailed implementation manners

[0036] Among them, it should be noted that: The base fabric of the present application is woven according to the Figure 1 described honeycomb texture diagram. After 4 cycles of weaving, the obtained base fabric is as Figure 2 shown. In the figure, the black is the warp points, floating on the surface; the white is the weft points, sinking on the reverse side of the fabric. Different interweaving positions generate different tensions, making the whole present the characteristics of alternating convex and concave stripes with intervals. Where there are many black and white interweaving points, convex stripes like tendons are formed (i.e., the raised areas), and the white areas are the concave points (i.e., the sunken areas). However, the honeycomb texture diagram is not limited to the honeycomb texture diagram of the present application Figure 1 , as long as it can make the base fabric present a three-dimensional honeycomb texture with distinct convex and concave. In addition, in the present application, the air permeability of the tape is tested according to the ASTM D737 standard, and the test of the tape peel strength refers to YY / T 0148-2006, and the peel speed is 300 mm / min.

[0037] The following further illustrates the present application in combination with specific experiments. Embodiment

[0038]

Embodiment 1

[0039] The preparation method of the breathable dot-shaped tape includes the following steps: Base fabric weaving: Weave the polyester-cotton blended yarn (70% polyester + 30% cotton) according to the Figure 1 honeycomb texture diagram in it to obtain the base fabric; among them, the warp and weft yarns are arranged alternately in thickness. The thick yarns of the warp and weft yarns use the polyester-cotton blended yarn with a yarn count of 40s, and the thin yarns of the warp and weft yarns use the polyester-cotton blended yarn with a yarn count of 90s; Burnout process: Put the base fabric into a sulfuric acid solution with a mass concentration of 20%, heat it up to 50 °C, and process for 15 min to dissolve part of the cotton fibers. Then wash the base fabric until the pH of the cleaning solution is neutral, and dry it to obtain a base material layer with a porosity of 20%; Glue scraping process: Scrap the acrylic pressure-sensitive adhesive on the base material layer. The pressure-sensitive adhesive in the raised areas of the base material layer is scraped off, and the pressure-sensitive adhesive is filled in the sunken areas of the base material layer. After curing, a pressure-sensitive adhesive layer with a thickness of 0.2 mm is formed.

[0040] After testing, the air permeability of the breathable dot-shaped tape in this example is 620 mL / (cm²·s), the pore size ranges from 10 to 20 μm, and the peel strength is 8.2 N / cm.

[0041]

Example 2

[0042] The preparation method of the breathable dot-shaped tape includes the following steps: Base fabric weaving: Weave the polyester-cotton blended yarn (70% polyester + 30% cotton) according to the Figure 1 honeycomb tissue diagram in it to obtain the base fabric; among them, the warp yarns and weft yarns are arranged alternately in thickness. The thick yarns of the warp yarns and weft yarns use the polyester-cotton blended yarn with a yarn count of 60s, and the thin yarns of the warp yarns and weft yarns use the polyester-cotton blended yarn with a yarn count of 100s; Burnout process: Put the base fabric into a sulfuric acid solution with a mass concentration of 20%, heat it up to 50°C, and process it for 30 minutes to dissolve part of the cotton fibers. Then wash the base fabric until the pH of the washing liquid is neutral, and dry it to obtain a base material layer with a porosity of 45%; Coating process: Coat the acrylic pressure-sensitive adhesive on the base material layer. The pressure-sensitive adhesive in the convex area of the base material layer is scraped off, and the pressure-sensitive adhesive is filled in the concave area of the base material layer. After curing, a pressure-sensitive adhesive layer with a thickness of 0.25 mm is formed.

[0043] After testing, the air permeability of the breathable dot-shaped tape in this example is 810 mL / (cm²·s), the pore size ranges from 30 to 50 μm, and the peel strength is 7.6 N / cm.

[0044]

Example 3

Example 1

[0045] After testing, the air permeability of the breathable dot-shaped tape containing a drug sustained-release component in this example is 623 mL / (cm²·s), the pore size ranges from 10 to 20 μm, the peel strength is 8.1 N / cm, and the drug release half-life is 48 h.

[0046]

Example 4

Example 2

[0047] After testing, the air permeability of the breathable dot-shaped tape containing the drug sustained-release component in this embodiment is 808 mL / (cm²·s), the pore size range is 30 - 50 μm, the peel strength is 7.3 N / cm, and the drug release half-life is 12 h.

[0048] Comparative Example

Comparative Example 1

Example 1

[0049] After testing, the air permeability of the breathable dot-shaped tape in this embodiment is 713 mL / (cm²·s), the pore size range is 40 - 120 μm, and the peel strength is 7.6 N / cm.

[0050]

Comparative Example 2

Example 1

[0051] After testing, the air permeability of the breathable dot-shaped tape in this embodiment is 685 mL / (cm²·s), the pore size range is 10 - 100 μm, and the peel strength is 7.8 N / cm.

[0052] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this specific embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. An air-permeable dot-shaped tape, characterized in that, Including: A base material layer, which is obtained by weaving blended interlaced yarns into a base fabric according to a honeycomb texture and then undergoing a burnout process. The base material layer has sunken areas and raised areas, and the porosity of the base material layer is 10 - 50%; A pressure - sensitive adhesive layer, which is distributed in a dot pattern and is only distributed in the sunken areas of the base material layer. There is no pressure - sensitive adhesive layer in the raised areas of the base material layer, and the raised areas serve as the air - permeable channels of the dot - shaped tape; Among them, the blended interlaced yarns adopt at least one of polyester - cotton blended yarns, chemical - fiber wrapped cotton core yarns, and cotton - coated chemical - fiber core covered core yarns.

2. The breathable dot-shaped tape according to claim 1, wherein: In the honeycomb texture, the warp yarns and weft yarns are arranged alternately in thickness. The thick yarn count is 40s - 60s, and the thin yarn count is 90s - 100s.

3. The breathable dot-shaped tape according to claim 1, characterized in that: The thickness of the pressure - sensitive adhesive layer is 0.15 - 0.25 mm.

4. The breathable dot-shaped tape according to claim 1, wherein: A drug - slow - release component is added to the pressure - sensitive adhesive layer.

5. A preparation process of a breathable dot-shaped tape as described in any one of claims 1-4, characterized in that, Including the following steps: Base fabric weaving: Weaving blended interlaced yarns according to a honeycomb texture to obtain a base fabric; the blended interlaced yarns adopt at least one of polyester - cotton blended yarns, chemical - fiber wrapped cotton core yarns, and cotton - coated chemical - fiber core covered core yarns; Burnout process: Putting the base fabric into an acid solution or an alkali solution for burnout treatment, and then washing and drying the base fabric to obtain the base material layer. In this step, the porosity of the base material layer is controlled to be 10 - 50%; Glue - spreading process: Scraping and coating pressure - sensitive adhesive on the base material layer. The pressure - sensitive adhesive in the raised areas of the base material layer is scraped off, and the pressure - sensitive adhesive fills the sunken areas of the base material layer and forms a pressure - sensitive adhesive layer after curing.

6. The preparation process of a breathable dot-shaped tape according to claim 5, characterized in that: The burnout process is selected according to the type of blended interlaced yarns used in the base fabric. Among them, for the burnout process of polyester - cotton blended yarns, the cotton - like fibers on the polyester - cotton blended yarns are dissolved by an acid solution, or the polyester fibers on the polyester - cotton blended yarns are dissolved by an alkali solution; for the burnout process of chemical - fiber wrapped cotton core yarns or cotton - coated chemical - fiber core covered core yarns, the cotton - like fibers are dissolved by an acid solution, and the chemical - fiber components are retained.

7. The preparation process of a breathable dot-shaped tape according to claim 5, characterized in that: The acid solution adopts a sulfuric acid solution.

8. The preparation process of a breathable dot-shaped tape according to claim 5, characterized in that: The alkali solution adopts at least one of sodium hydroxide solution and potassium hydroxide solution.

9. The preparation process of a breathable dot-shaped tape according to claim 5, characterized in that, In the glue - spreading process, a drug - slow - release component is added to the pressure - sensitive adhesive, and the incorporation amount of the drug - slow - release component is 1 - 6% of the weight of the pressure - sensitive adhesive.

10. The preparation process of a breathable dot-shaped tape according to claim 9, characterized in that: In the burnout process, the porosity of the base material layer is controlled within 20 - 45%.

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