High-air-permeability sticky low-sensitivity adhesive sticker and preparation method thereof

Abstract

The invention discloses a high-breathability sticky low-sensitivity adhesive and a preparation method thereof, and relates to the technical field of medical adhesives. The preparation method comprises the following steps: copolymerizing methacrylate siloxane and fluorinated acrylate to obtain modified polyacrylate resin, blending the modified polyacrylate resin with ethanol, water, a molecular sieve and a cross-linking agent to prepare colloid, finally adhering the colloid to a cloth base material, and adhering release paper to one surface, deviating from the cloth base material, of the colloid, so as to obtain the anti-sticking fabric. And the adhesive sticker is obtained. The adhesive tape has excellent high air permeability and low sensitivity, also has better water resistance, and has wide application prospects and markets in the aspects of medical adhesive tapes and the like.

Description

Technical Field

[0001] The present application relates to the technical field of medical adhesive patches, and in particular to a highly breathable viscous low-sensitivity adhesive patch and a preparation method thereof. Background Art

[0002] In the medical and health field, as people pay more and more attention to health and safety, higher requirements are placed on products that directly contact the skin, such as medical patches. Especially for medical patches or dressings that need to be worn for a long time, high breathability and hypoallergenicity are important requirements. High breathability can ensure the normal breathing of the skin and reduce skin discomfort or allergic reactions caused by the accumulation of sweat and moisture. Hypoallergenicity means that the product itself will not cause skin allergic reactions or irritation during use, which is especially friendly to people with sensitive skin. Therefore, it is of great significance to develop a viscous hypoallergenic patch with high breathability.

[0003] A Chinese patent application with publication number CN 106361496 A discloses a breathable medical tape, comprising a waterproof layer, a backing layer, an adhesive layer and a release paper layer arranged in sequence from top to bottom, wherein the adhesive layer has protrusions arranged vertically and horizontally and evenly arranged above the release paper layer, and the backing layer has air holes evenly distributed at the gap positions corresponding to the protrusions, and the air holes penetrate to the surface of the waterproof layer.

[0004] However, the breathable medical tape produced by this solution has a complex structure and its performance still has room for improvement. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present application provides a highly air-permeable viscous low-sensitivity adhesive patch and a preparation method thereof, wherein methacrylate-based siloxane and fluorinated acrylate are copolymerized to obtain a modified polyacrylate resin, and the modified polyacrylate resin is then blended with ethanol, water, molecular sieves and a cross-linking agent to form a colloid, and finally the colloid is bonded to a fabric substrate to obtain the adhesive patch. The adhesive patch has excellent high air permeability and low sensitivity, and has broad application prospects and markets in medical adhesive patches and the like.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions: In the first aspect, the present application provides a highly breathable viscous low-sensitivity adhesive patch, comprising a fabric substrate, a colloid bonded to the fabric substrate, and a release paper bonded to the colloid on the side away from the fabric substrate. The fabric substrate comprises any one of cotton cloth, non-woven fabric, and Johnson fabric; the release paper comprises any one of release paper, glassine paper, and silicone oil paper; the colloid is prepared by blending modified polyacrylate resin, ethanol, water, molecular sieve, crosslinking agent, and tackifier; the modified polyacrylate resin is copolymerized by methacrylate-based siloxane and fluorinated acrylate.

[0007] In a second aspect, the present application provides a method for preparing a highly air-permeable viscous low-sensitivity adhesive patch, comprising: Add modified polyacrylate resin, ethanol, water, molecular sieve, crosslinking agent and tackifier into reactor I, stir and blend at 50-60° C. under nitrogen protection for 2-4 hours, and cool and discharge to obtain the colloid; Finally, the glue is coated and bonded to the substrate by a glue coating machine, and then dried at 80-90° C., and then a release paper is attached to the side of the glue facing away from the fabric substrate, so as to obtain the highly breathable viscous low-sensitivity adhesive tape.

[0008] The method for preparing the above-mentioned highly air-permeable viscous low-sensitivity adhesive patch further comprises preparing a modified polyacrylate resin: First, add methacrylate siloxane, fluorinated acrylate and solvent A into reactor II, stir under nitrogen protection, and heat to 150-160°C; Then, initiator and chain transfer agent were added to reactor II, followed by reflux reaction at 150-160°C under nitrogen protection for 2-3 hours; Then the temperature is lowered to 50-70°C and the material is discharged to obtain modified polyacrylate resin.

[0009] Beneficial technical effects: This application innovatively uses methacrylate-based siloxane and fluorine-containing acrylate to copolymerize to obtain a modified polyacrylate resin having a large number of carbon-fluorine bond structures and siloxane structures. The modified polyacrylate resin is blended with ethanol, water, molecular sieves and cross-linking agents to form a colloid, and finally the colloid is bonded to a cloth substrate to obtain the highly breathable adhesive low-sensitivity adhesive patch. When the siloxane structure in the modified polyacrylate resin is mixed with ethanol and water, it hydrolyzes to produce silanols, which can react with the silanols on the surface of the molecular sieve to form a strong silicon-oxygen-silicon chemical bond, so that the molecular sieve can better combine with the modified polyacrylate resin. The large number of pore structures in the molecular sieve make it easier for water vapor molecules to pass through, thereby greatly improving the air permeability of the medical adhesive patch. Moreover, in the large number of carbon-fluorine bond structures contained in the modified polyacrylate resin, the fluorine atom has a strong electronegativity, and the electron cloud is more biased towards the side of the fluorine atom, so that the fluorine-containing group forms an electron shielding layer in the modified polyacrylate resin, preventing the interaction between water molecules and the polymer surface, achieving a significant water-blocking effect, thereby further indirectly improving the air permeability of the medical adhesive patch. The combination of the two makes the adhesive patch have excellent air permeability and water-blocking properties. At the same time, the ingredients of the adhesive patch are all low-sensitivity substances, so it also has low sensitivity and has broad application prospects and markets. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of a highly breathable adhesive low-sensitivity adhesive patch.

[0011] Figure 2 It is a schematic diagram of the chemical reaction for preparing modified polyacrylate resin.

[0012] Figure 3 It is a schematic diagram of the process of preparing a highly breathable viscous low-sensitivity adhesive patch.

[0013] Figure 4 is the chemical structural formula of the modified polyacrylate resin prepared in Example 1.

[0014] Figure numerals: 1. anti-sticking paper; 2. colloid; 3. cloth substrate. DETAILED DESCRIPTION

[0015] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application is further described in detail below in conjunction with the embodiments. However, this should not be understood as the scope of the present application being limited to the following examples. Without departing from the above-mentioned method ideas of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0016] In this application, the terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit the application.

[0017] The terms “first” and “second”, if used, are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0018] In addition, as used in this application, the singular forms "for", "or", "a", "any", "any one" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0019] In the first aspect, the present application provides a highly breathable viscous low-sensitivity adhesive patch, comprising a fabric substrate 3, a colloid 2 bonded to the fabric substrate 3, and a release paper 1 bonded to the colloid 2 on a side away from the fabric substrate 3, the structural schematic diagram of which is shown in FIG. Figure 1 As shown. The fabric substrate 3 includes any one of cotton cloth, non-woven fabric and resistant fabric; the anti-adhesive paper 1 includes any one of release paper, glassine paper and silicone oil paper; the colloid 2 is prepared by blending modified polyacrylate resin, ethanol, water, molecular sieve, crosslinking agent and tackifier; the modified polyacrylate resin is copolymerized by methacrylate siloxane and fluorine-containing acrylate.

[0020] In a possible implementation, the mass ratio of the polyacrylate resin, ethanol, water, molecular sieve, cross-linking agent and tackifying resin is (50-60): (10-20): (10-20): (5-15): (1-3): (5-10).

[0021] In a possible implementation, the particle size of the molecular sieve is in the range of 0.1 to 1.5 μm, including one or more of type A molecular sieve, type X molecular sieve and type Y molecular sieve.

[0022] In a possible implementation, the cross-linking agent includes any one of dicumyl peroxide, benzoyl peroxide, and dicumyl hydroperoxide.

[0023] In a possible implementation, the tackifier includes any one of maleic rosin, rosin glycerol ester, and terpene resin.

[0024] In a possible implementation, the structure of the fluorinated acrylate includes: ; Wherein R represents a substituent on the carbon to which it is connected, including any one of hydrogen and methyl; R' represents a substituent on the oxygen to which it is connected, including any one of the following structures: .

[0025] In a possible implementation, the structure of the methacrylate siloxane includes: ; Wherein R'' represents a substituent on the oxygen to which it is connected, including any one of the following structures: .

[0026] In a possible implementation, the process of copolymerizing the methacrylate-based siloxane with the fluorinated acrylate to obtain the modified polyacrylate resin comprises: ; Wherein, the structure of the modified polyacrylate resin is as follows Figure 2 As shown, including: ; R represents a substituent on the carbon to which it is connected, including any one of hydrogen and methyl; R' represents a substituent on the oxygen to which it is connected, including any one of the following structures: ; R'' represents a substituent on the oxygen to which it is connected, including any of the following structures: ; n is an integer in the range of 40 to 80; m is an integer in the range of 60 to 100.

[0027] In a second aspect, the present application provides a method for preparing a highly breathable viscous low-sensitivity adhesive patch, such as Figure 3 As shown, including: Add modified polyacrylate resin, ethanol, water, molecular sieve, crosslinking agent and tackifier into reactor I, stir and blend at 50-60° C. under nitrogen protection for 2-4 hours, and cool and discharge to obtain colloid 2; Finally, the glue 2 is coated and bonded to the substrate by a glue coating machine, and then dried at 80-90° C., and then the anti-sticking paper 1 is attached to the side of the glue 2 facing away from the cloth substrate 3, so as to obtain the highly breathable viscous low-sensitivity adhesive tape.

[0028] The method for preparing the above-mentioned highly air-permeable viscous low-sensitivity adhesive patch further comprises preparing a modified polyacrylate resin: First, add methacrylate siloxane, fluorinated acrylate and solvent A into reactor II, stir under nitrogen protection, and heat to 150-160°C; Then, initiator and chain transfer agent were added to reactor II, followed by reflux reaction at 150-160°C under nitrogen protection for 2-3 hours; Then the temperature is lowered to 50-70°C and the material is discharged to obtain modified polyacrylate resin.

[0029] In a possible implementation, the solvent A includes one or more of ethyl acetate and dichloromethane.

[0030] In a possible implementation, the initiator includes one or more of azobisisobutyronitrile and azobisisoheptylnitrile.

[0031] In a possible implementation, the chain transfer agent includes one or more of n-dodecyl mercaptan, tert-dodecyl mercaptan and hexadecyl mercaptan.

[0032] In a possible implementation, the mass ratio of the methacrylate siloxane, fluorinated acrylate, solvent A, initiator and chain transfer agent is: (20-40): (30-50): (20-30): (0.5-1.5): (1.5-3).

[0033] The following will specifically describe a highly breathable viscous low-sensitivity adhesive patch and a preparation method thereof provided by the present application in combination with different embodiments.

[0034] Embodiment 1: like Figure 3 As shown, a method for preparing a highly air-permeable viscous low-sensitivity adhesive patch comprises the following steps: 1. Change the structure to Methacrylate siloxane, structure: The fluorinated acrylate and solvent ethyl acetate were added into the reaction kettle II, stirred under nitrogen protection, and heated to 150°C; 2. Then, azobisisobutyronitrile and n-dodecyl mercaptan were added to the reactor II, and then refluxed at 150° C. for 2 h under nitrogen protection; 3. Then cool down to 50°C and discharge the material to obtain modified polyacrylate resin; In steps 1 to 3, , ethyl acetate, azobisisobutyronitrile and n-dodecyl mercaptan in a mass ratio of 30:40:28:0.5:1.5; The structure of the modified polyacrylate resin is as follows: Figure 4 shown.

[0035] 4. Add modified polyacrylate resin, ethanol, water, type A molecular sieve, dicumyl peroxide and maleic rosin into the reaction kettle I, stir and blend at 50° C. under nitrogen protection for 2 hours, and cool the material to obtain the colloid 2; 5. Finally, the glue 2 is coated and bonded to the substrate by a glue coating machine, and then the anti-sticking paper 1 is attached to the side of the glue 2 facing away from the cloth substrate 3 after drying at 80°C, so as to obtain the highly breathable viscous low-sensitivity adhesive tape; In steps 4 and 5, the mass ratio of modified polyacrylate resin, ethanol, water, type A molecular sieve, dicumyl peroxide and maleic rosin is 60:10:10:10:2:8.

[0036] Embodiment 2:

[0037] like Figure 3 As shown, a method for preparing a highly air-permeable viscous low-sensitivity adhesive patch comprises the following steps: 1. Change the structure to Methacrylate siloxane, structure: The fluorinated acrylate and solvent dichloromethane were added into the reaction kettle II, stirred under nitrogen protection, and heated to 160°C; 2. Then, azobisisoheptanenitrile and tert-dodecyl mercaptan were added to the reactor II, and then refluxed at 160° C. for 3 h under nitrogen protection; 3. Then cool down to 70°C and discharge the material to obtain modified polyacrylate resin; In steps 1 to 3, The mass ratio of dichloromethane, azobisisoheptanenitrile and tert-dodecyl mercaptan is: 25:45:27:1:2; 4. Add modified polyacrylate resin, ethanol, water, X-type molecular sieve, benzoyl peroxide and rosin glycerol ester into the reaction kettle I, stir and blend at 60° C. under nitrogen protection for 4 hours, and cool the material to obtain the colloid 2; 5. Finally, the glue 2 is coated and bonded to the substrate by a glue coating machine, and then the anti-sticking paper 1 is attached to the side of the glue 2 facing away from the cloth substrate 3 after drying at 90°C, so as to obtain the highly breathable viscous low-sensitivity adhesive tape; In steps 4 and 5, the mass ratio of modified polyacrylate resin, ethanol, water, X-type molecular sieve, benzoyl peroxide and rosin glycerol ester is 50:15:10:15:3:7.

[0038] Embodiment 3:

[0039] like Figure 3 As shown, a method for preparing a highly air-permeable viscous low-sensitivity adhesive patch comprises the following steps: 1. Change the structure to Methacrylate siloxane, structure: The fluorinated acrylate and solvent ethyl acetate were added into the reaction kettle II, stirred under nitrogen protection, and heated to 155°C; 2. Then, azobisisobutyronitrile and hexadecyl mercaptan were added to the reactor II, and then refluxed at 155° C. under nitrogen protection for 2.5 h; 3. Then cool to 65°C and discharge to obtain modified polyacrylate resin; In steps 1 to 3, , ethyl acetate, azobisisobutyronitrile and hexadecyl mercaptan in a mass ratio of 40:36:20:1:3; 4. Add modified polyacrylate resin, ethanol, water, Y-type molecular sieve, diisopropylbenzene hydroperoxide and terpene resin into the reaction kettle I, stir and blend at 55° C. under nitrogen protection for 3 hours, and cool and discharge to obtain the colloid 2; 5. Finally, the glue 2 is coated and bonded to the substrate by a glue coating machine, and then the anti-sticking paper 1 is attached to the side of the glue 2 facing away from the cloth substrate 3 after drying at 85°C, so as to obtain the highly breathable viscous low-sensitivity adhesive tape; In steps 4 and 5, the mass ratio of modified polyacrylate resin, ethanol, water, Y-type molecular sieve, diisopropylbenzene hydroperoxide and terpene resin is 55:15:15:8:2:5.

[0040] Embodiment 4:

[0041] like Figure 3 As shown, a method for preparing a highly air-permeable viscous low-sensitivity adhesive patch comprises the following steps: 1. Change the structure to Methacrylate siloxane, structure: The fluorinated acrylate and solvent dichloromethane were added into the reaction kettle II, stirred under nitrogen protection, and heated to 160°C; 2. Then, azobisisoheptanenitrile and n-dodecyl mercaptan were added to the reactor II, and then refluxed at 160° C. for 3 h under nitrogen protection; 3. Then cool to 60°C and discharge to obtain modified polyacrylate resin; In steps 1 to 3, The mass ratio of dichloromethane, azobisisoheptanenitrile and n-dodecyl mercaptan is: 25:50:23:1:1; 4. Add modified polyacrylate resin, ethanol, water, X-type molecular sieve, benzoyl peroxide and rosin glycerol ester into the reaction kettle I, stir and blend at 60° C. under nitrogen protection for 3.5 hours, and cool the material to obtain the colloid 2; 5. Finally, the glue 2 is coated and bonded to the substrate by a glue coating machine, and then the anti-sticking paper 1 is attached to the side of the glue 2 facing away from the cloth substrate 3 after drying at 80°C, so as to obtain the highly breathable viscous low-sensitivity adhesive tape; In steps 4 and 5, the mass ratio of modified polyacrylate resin, ethanol, water, X-type molecular sieve, benzoyl peroxide and rosin glycerol ester is 50:10:14:15:1:10.

[0042] Embodiment 5: like Figure 3 As shown, a method for preparing a highly air-permeable viscous low-sensitivity adhesive patch comprises the following steps: 1. Change the structure to Methacrylate siloxane, structure: The fluorinated acrylate and solvent ethyl acetate were added into the reaction kettle II, stirred under nitrogen protection, and heated to 150°C; 2. Then, azobisisobutyronitrile and hexadecyl mercaptan were added to the reactor II, and then refluxed at 150° C. for 3 h under nitrogen protection; 3. Then cool down to 55°C and discharge the material to obtain modified polyacrylate resin; In steps 1 to 3, , ethyl acetate, azobisisobutyronitrile and hexadecyl mercaptan in a mass ratio of 40:35:22:1.5:1.5; 4. Add modified polyacrylate resin, ethanol, water, type A molecular sieve, dicumyl peroxide and terpene resin into the reaction kettle I, stir and blend at 55° C. under nitrogen protection for 4 hours, and cool and discharge to obtain the colloid 2; 5. Finally, the glue 2 is coated and bonded to the substrate by a glue coating machine, and then the anti-sticking paper 1 is attached to the side of the glue 2 facing away from the cloth substrate 3 after drying at 90°C, so as to obtain the highly breathable viscous low-sensitivity adhesive tape; In steps 4 and 5, the mass ratio of modified polyacrylate resin, ethanol, water, type A molecular sieve, diisopropylbenzene peroxide and terpene resin is 55:10:15:12:3:5.

[0043] Embodiment 6: like Figure 3 As shown, a method for preparing a highly air-permeable viscous low-sensitivity adhesive patch comprises the following steps: 1. Change the structure to Methacrylate siloxane, structure: The fluorinated acrylate and solvent dichloromethane were added into the reaction kettle II, stirred under nitrogen protection, and heated to 155°C; 2. Then, azobisisoheptanenitrile and tert-dodecyl mercaptan were added to the reaction kettle II, and then refluxed at 155° C. under nitrogen protection for 2.5 h; 3. Then cool to 60°C and discharge to obtain modified polyacrylate resin; In steps 1 to 3, The mass ratio of dichloromethane, azobisisoheptanenitrile and tert-dodecyl mercaptan is 30:45:21:1:3; 4. Add modified polyacrylate resin, ethanol, water, X-type molecular sieve, benzoyl peroxide and rosin glycerol ester into the reaction kettle I, stir and blend at 50° C. under nitrogen protection for 2 hours, and cool the material to obtain the colloid 2; 5. Finally, the glue 2 is coated and bonded to the substrate by a glue coating machine, and then the anti-sticking paper 1 is attached to the side of the glue 2 facing away from the cloth substrate 3 after drying at 80°C, so as to obtain the highly breathable viscous low-sensitivity adhesive tape; In steps 4 and 5, the mass ratio of modified polyacrylate resin, ethanol, water, X-type molecular sieve, benzoyl peroxide and rosin glycerol ester is 56:12:12:12:2:6.

[0044] Comparative Example 1: A method for preparing a highly air-permeable viscous low-sensitivity adhesive patch comprises the following steps: 1. Change the structure to Methacrylate siloxane, structure: The fluorinated acrylate and solvent ethyl acetate were added into the reaction kettle II, stirred under nitrogen protection, and heated to 150°C; 2. Then, azobisisobutyronitrile and n-dodecyl mercaptan were added to the reactor II, and then refluxed at 150° C. for 2 h under nitrogen protection; 3. Then cool down to 50°C and discharge the material to obtain modified polyacrylate resin; In steps 1 to 3, , ethyl acetate, azobisisobutyronitrile and n-dodecyl mercaptan in a mass ratio of 30:40:28:0.5:1.5; The structure of the modified polyacrylate resin is as follows: Figure 4 shown.

[0045] 4. Add modified polyacrylate resin, ethanol, water, type A molecular sieve, dicumyl peroxide and maleic rosin into the reaction kettle I, stir and blend at 50° C. under nitrogen protection for 2 hours, and cool the material to obtain the colloid 2; 5. Finally, the glue 2 is coated and bonded to the substrate by a glue coating machine, and then the anti-sticking paper 1 is attached to the side of the glue 2 facing away from the cloth substrate 3 after drying at 80°C, so as to obtain the highly breathable viscous low-sensitivity adhesive tape; In steps 4 and 5, the mass ratio of modified polyacrylate resin, ethanol, water, type A molecular sieve, dicumyl peroxide and maleic rosin is 60:10:10:10:2:8.

[0046] Comparative Example 2: A method for preparing a highly air-permeable viscous low-sensitivity adhesive patch comprises the following steps: 1. Change the structure to Methacrylate siloxane, structure: The fluorinated acrylate and solvent ethyl acetate were added into the reaction kettle II, stirred under nitrogen protection, and heated to 155°C; 2. Then, azobisisobutyronitrile and hexadecyl mercaptan were added to the reactor II, and then refluxed at 155° C. under nitrogen protection for 2.5 h; 3. Then cool to 65°C and discharge to obtain modified polyacrylate resin; In steps 1 to 3, , ethyl acetate, azobisisobutyronitrile and hexadecyl mercaptan in a mass ratio of 40:36:20:1:3; 4. Add modified polyacrylate resin, ethanol, water, spherical silica, diisopropylbenzene hydroperoxide and terpene resin into the reaction kettle I, stir and blend at 55° C. under nitrogen protection for 3 hours, and cool and discharge to obtain the colloid 2; 5. Finally, the glue 2 is coated and bonded to the substrate by a glue coating machine, and then the anti-sticking paper 1 is attached to the side of the glue 2 facing away from the cloth substrate 3 after drying at 85°C, so as to obtain the highly breathable viscous low-sensitivity adhesive tape; In steps 4-5, the mass ratio of modified polyacrylate resin, ethanol, water, spherical silica, diisopropylbenzene hydroperoxide and terpene resin is 55:15. Comparative Example 3: A method for preparing a highly air-permeable viscous low-sensitivity adhesive patch comprises the following steps: 1. Change the structure to Methacrylate siloxane, structure: The fluorinated acrylate and solvent dichloromethane were added into the reaction kettle II, stirred under nitrogen protection, and heated to 155°C; 2. Then, azobisisoheptanenitrile and tert-dodecyl mercaptan were added to the reaction kettle II, and then refluxed at 155° C. under nitrogen protection for 2.5 h; 3. Then cool to 60°C and discharge to obtain modified polyacrylate resin; In steps 1 to 3, The mass ratio of dichloromethane, azobisisoheptanenitrile and tert-dodecyl mercaptan is 30:45:21:1:3; 4. Add modified polyacrylate resin, ethanol, water, X-type molecular sieve, benzoyl peroxide and rosin glycerol ester into the reaction kettle I, stir and blend at 50° C. under nitrogen protection for 2 hours, and cool the material to obtain the colloid 2; 5. Finally, the glue 2 is coated and bonded to the substrate by a glue coating machine, and then the anti-sticking paper 1 is attached to the side of the glue 2 facing away from the cloth substrate 3 after drying at 80°C, so as to obtain the highly breathable viscous low-sensitivity adhesive tape; In steps 4 and 5, the mass ratio of modified polyacrylate resin, ethanol, water, X-type molecular sieve, benzoyl peroxide and rosin glycerol ester is 56:12:12:12:2:6.

[0047] With reference to YY / T 0148-2006, the water vapor permeability test method is adopted to test the water vapor permeability of the prepared high-breathable adhesive low-sensitivity adhesive tape every 24 hours to reflect its breathability.

[0048] Referring to YY / T 0471.3-2004, the water seepage of the prepared high-breathable viscous low-sensitivity adhesive tape after being subjected to a static water pressure of 500mm for 300s is tested to reflect its water barrier properties.

[0049] Table 1 Performance test results of high air permeability adhesive low-sensitivity adhesive patch prepared in Examples and Comparative Examples

[0050] It can be seen from Table 1 that the water vapor permeation of Examples 1 to 6 per 24 hours is much higher than that of Comparative Examples 1 to 3, and there is no water seepage in Examples 1 to 6 after being subjected to a hydrostatic pressure of 500 mm for 300 seconds, while there is water seepage in Comparative Examples 1 to 3.

[0051] This is because the siloxane structure in the modified polyacrylate resin used in Examples 1 to 6, when mixed with ethanol and water, hydrolyzes to produce silanol, which can react with the silanol on the surface of the molecular sieve to form a strong silicon-oxygen-silicon chemical bond, so that the molecular sieve can better combine with the modified polyacrylate resin. The large number of pores in the molecular sieve makes it easier for water vapor molecules to pass through, thereby greatly improving the air permeability of the medical adhesive patch.

[0052] At the same time, the modified polyacrylate resin contains a large number of carbon-fluorine bond structures, in which the fluorine atom has a strong electronegativity and the electron cloud is more biased toward the side of the fluorine atom, so that the fluorine-containing group forms an electron shielding layer in the modified polyacrylate resin, preventing the interaction between water molecules and the polymer surface, and achieving a significant water-blocking effect.

[0053] The combination of the two makes the adhesive tape have excellent air permeability and water barrier properties. At the same time, the adhesive tape is made of low-allergy substances, so it is also low-allergy and has broad application prospects and markets.

[0054] In Comparative Example 2, no molecular sieve with a porous structure is used; in Comparative Example 3, no siloxane structure is contained, and even if a molecular sieve is used, it cannot be well combined with the resin; at the same time, Comparative Examples 1 to 3 do not contain a carbon-fluorine bond structure, and cannot prevent the interaction between water molecules and the polymer surface. Therefore, the water resistance and air permeability of Comparative Examples 1 to 3 are ultimately inferior to those of Examples 1 to 6.

[0055] The above results show and describe the basic principles and main features of the present application as well as the advantages of the present application.

[0056] Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection sought in the present application is defined by the equivalents of the attached claims.

Claims

1. A highly breathable, viscous, low-sensitivity adhesive tape comprising a fabric substrate (3), a colloid (2) bonded to the fabric substrate (3), and a release paper (1) bonded to the colloid (2) on a side facing away from the fabric substrate (3); characterized in that: The fabric substrate (3) comprises any one of cotton fabric, non-woven fabric and resistant fabric; the anti-adhesive paper (1) comprises any one of release paper, glassine paper and silicone oil paper; the colloid (2) is prepared by blending modified polyacrylate resin, ethanol, water, molecular sieve, crosslinking agent and tackifier; the modified polyacrylate resin is copolymerized by methacrylate-based siloxane and fluorine-containing acrylate.

2. A highly air permeable viscous low-sensitivity adhesive patch according to claim 1, characterized in that: The mass ratio of the polyacrylate resin, ethanol, water, molecular sieve, cross-linking agent and tackifying resin is (50-60): (10-20): (10-20): (5-15): (1-3): (5-10); the particle size range of the molecular sieve is 0.1-1.5 μm, including one or more of type A molecular sieve, type X molecular sieve and type Y molecular sieve; the cross-linking agent includes any one of diisopropylbenzene peroxide, benzoyl peroxide and diisopropylbenzene hydroperoxide; the tackifying agent includes any one of maleic rosin, rosin glycerol ester and terpene resin.

3. A highly air-permeable viscous low-sensitivity adhesive patch according to claim 1, characterized in that: The structure of the fluorinated acrylate comprises: ； Wherein R represents a substituent on the carbon to which it is connected, including any one of hydrogen and methyl; R' represents a substituent on the oxygen to which it is connected, including any one of the following structures: 。 4. A highly air permeable viscous low-sensitivity adhesive patch according to claim 1, characterized in that: The structure of the methacrylate siloxane comprises: ； Wherein R'' represents a substituent on the oxygen to which it is connected, including any one of the following structures: 。 5. The highly air-permeable viscous low-sensitivity adhesive patch according to claim 1, characterized in that: The process of copolymerizing the methacrylate-based siloxane with the fluorinated acrylate to obtain the modified polyacrylate resin comprises: ； Wherein, the structure of the modified polyacrylate resin comprises: ； R represents a substituent on the carbon to which it is connected, including any one of hydrogen and methyl; R' represents a substituent on the oxygen to which it is connected, including any one of the following structures: ； R'' represents a substituent on the oxygen to which it is connected, including any of the following structures: ； n is an integer in the range of 40 to 80; m is an integer in the range of 60 to 100.

6. The method for preparing a highly air-permeable viscous low-sensitivity adhesive patch according to any one of claims 1 to 5, characterized in that: The following steps are involved: Add modified polyacrylate resin, ethanol, water, molecular sieve, crosslinking agent and tackifier into reactor I, stir and blend at 50-60° C. under nitrogen protection for 2-4 hours, and cool and discharge to obtain the colloid (2); Finally, the glue (2) is coated and bonded to the substrate by a glue coating machine, and after drying at 80-90° C., a release paper (1) is attached to the side of the glue (2) facing away from the fabric substrate (3), thereby obtaining the highly breathable viscous low-sensitivity adhesive tape.

7. The method for preparing a highly air-permeable viscous low-sensitivity adhesive patch according to claim 6, characterized in that: Also included is the preparation of modified polyacrylate resin: First, add methacrylate siloxane, fluorinated acrylate and solvent A into reactor II, stir under nitrogen protection, and heat to 150-160°C; Then, initiator and chain transfer agent were added to reactor II, followed by reflux reaction at 150-160°C under nitrogen protection for 2-3 hours; Then the temperature is lowered to 50-70°C and the material is discharged to obtain modified polyacrylate resin.

8. The method for preparing a highly air-permeable viscous low-sensitivity adhesive patch according to claim 7, characterized in that: The solvent A includes one or more of ethyl acetate and dichloromethane.

9. The method for preparing a highly air-permeable viscous low-sensitivity adhesive patch according to claim 7, characterized in that: The initiator includes one or more of azobisisobutyronitrile and azobisisoheptanenitrile; the chain transfer agent includes one or more of n-dodecyl mercaptan, tert-dodecyl mercaptan and hexadecyl mercaptan.

10. The method for preparing a highly air-permeable viscous low-sensitivity adhesive patch according to claim 7, characterized in that: The mass ratio of the methacrylate siloxane, fluorinated acrylate, solvent A, initiator and chain transfer agent is: (20-40): (30-50): (20-30): (0.5-1.5): (1.5-3).

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