Ultraviolet curing pressure-sensitive adhesive for dressing and preparation method of ultraviolet curing pressure-sensitive adhesive

Abstract

The invention relates to an ultraviolet light curing pressure-sensitive adhesive for dressing and a preparation method thereof, and relates to the technical field of pressure-sensitive adhesives, the preparation method of the ultraviolet light curing pressure-sensitive adhesive for dressing comprises the following steps: carrying out first illumination treatment on an ultraviolet light curing pressure-sensitive adhesive precursor slurry in a wavelength range of 254 + / -2nm, and then carrying out second illumination treatment in a wavelength range of 365 + / -2nm to obtain the ultraviolet curing pressure-sensitive adhesive. According to the preparation method disclosed by the invention, the ultraviolet curing pressure-sensitive adhesive precursor slurry containing the long-chain alkyl acrylate monomer is subjected to step-by-step illumination in two specific wavelength ranges and under proper illumination parameters, so that the water resistance of the obtained ultraviolet curing pressure-sensitive adhesive is remarkably improved, and no adhesive residue is left after stripping; the use requirements of the pressure-sensitive adhesive for the dressing can be met, and a new process is provided for preparing the ultraviolet curing pressure-sensitive adhesive.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure-sensitive adhesives, and in particular to an ultraviolet-curable pressure-sensitive adhesive for dressings and a preparation method thereof. Background Art

[0002] Pressure Sensitive Adhesive (PSA) is a unique adhesive that can achieve a strong bond with the adherend by applying only slight pressure without the need for solvents, water, or other auxiliary means. It is widely used in the field of medical dressings.

[0003] However, current traditional pressure-sensitive adhesives for dressings, such as acrylics, have obvious shortcomings in performance, especially in terms of water resistance. In people's daily lives and medical care scenarios, wounds will inevitably come into contact with sweat, bath water or other types of liquids. If the water resistance of the pressure-sensitive adhesive is poor, moisture can easily penetrate between the adhesive layer and the skin. Once moisture invades, the bonding performance of the adhesive layer will drop significantly, causing the dressing to fall off easily. Once the dressing falls off, it will not be able to effectively play its key role in protecting the wound, increasing the risk of external contamination and secondary damage to the wound.

[0004] In addition to water resistance issues, some traditional pressure-sensitive adhesives can leave residual adhesive residue when peeled from the skin. This residual adhesive not only severely affects the skin's aesthetics and creates a psychological burden for patients, but more seriously, it becomes an ideal breeding ground for bacteria, greatly increasing the likelihood of wound infection. The residual adhesive problem is particularly prominent in situations where frequent dressing changes are required. With each dressing change, residual adhesive accumulates, causing significant inconvenience and pain to the patient. Summary of the Invention

[0005] To solve the above problems, the present invention provides a UV-curable pressure-sensitive adhesive for dressing and a preparation method thereof.

[0006] In a first aspect, the present invention provides a method for preparing a UV-curable pressure-sensitive adhesive for a dressing, the method comprising the following steps:

[0007] The UV-curable pressure-sensitive adhesive precursor slurry is subjected to a first light treatment at a wavelength range of 254±2nm, and then subjected to a second light treatment at a wavelength range of 365±2nm to obtain the UV-curable pressure-sensitive adhesive;

[0008] The working condition parameters of the first light treatment include: light exposure time of 90-120s, light radiation power density of 4-6mW·cm -2The working condition parameters of the second light treatment include: illumination time of 30~45s, light radiation power density of 1~2mW·cm -2 ;

[0009] The UV-curable pressure-sensitive adhesive precursor slurry includes an acrylate monomer containing a long-chain alkyl group with 10 to 13 carbon atoms.

[0010] Furthermore, the working condition parameters of the first light treatment include: light exposure time of 115s, light radiation power density of 5mW·cm -2 .

[0011] Furthermore, the working condition parameters of the second light treatment include: light exposure time of 40s, light radiation power density of 1.5mW·cm -2 .

[0012] Furthermore, the preparation of the UV-curable pressure-sensitive adhesive precursor slurry includes the following process:

[0013] Mixing tert-butyl acrylate, vinyl acetate, butyl acrylate, isooctyl acrylate, acrylic acid, the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms, and a light curing agent to obtain a first mixture;

[0014] The first mixed material accounting for 55-60wt% of the total amount of the first mixed material, the initiator accounting for 55-60wt% of the total amount of the initiator, and the organic solvent accounting for 75-80wt% of the total amount of the organic solvent are stirred and mixed at a temperature of 75-80°C for 1-2 hours, and then the remaining first mixed material, the remaining initiator and the remaining organic solvent are pre-mixed and added dropwise to the reaction system and continued to stir for 4.5-5.5 hours to obtain the UV-curable pressure-sensitive adhesive precursor slurry.

[0015] Furthermore, the weight ratio of the tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid, and the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms is (10 to 14): (12 to 15): (16 to 20): (30 to 35): (8 to 12): (5 to 10).

[0016] Furthermore, the added weight of the photocuring agent accounts for 0.3-0.5 wt % of the total weight of the six monomers of tert-butyl acrylate, vinyl acetate, butyl acrylate, isooctyl acrylate, acrylic acid and the acrylate monomer containing a long-chain alkyl group of 10-13 carbon atoms.

[0017] Furthermore, the weight of the added initiator accounts for 0.2-0.3 wt% of the total weight of the six monomers of tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid, and the acrylic ester monomers containing a long-chain alkyl group of 10-13 carbon atoms; and the weight of the added organic solvent accounts for 1-1.5 times the total weight of the six monomers of tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid, and the acrylic ester monomers containing a long-chain alkyl group of 10-13 carbon atoms.

[0018] Furthermore, the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms includes at least one of decaacrylate, decamethacrylate, undecyl acrylate, undecyl methacrylate, dodecyl acrylate, dodecyl methacrylate, tridecyl acrylate, and tridecyl methacrylate; the photocuring agent includes at least one of vinyl benzoin and 4-acryloyloxybenzophenone; the initiator includes azobisisobutyronitrile; and the organic solvent is composed of ethyl acetate and cyclohexane in a volume ratio of (2 to 4): (1 to 2).

[0019] In the second aspect, based on the same inventive concept, the present invention provides a UV-curable pressure-sensitive adhesive for a dressing, wherein the UV-curable pressure-sensitive adhesive for a dressing is prepared by the preparation method of the UV-curable pressure-sensitive adhesive for a dressing described in any one of the first aspects.

[0020] Furthermore, the physical and chemical property parameters of the UV-curable pressure-sensitive adhesive used for the dressing include:

[0021] Peel strength is 1.8~2.6N / cm;

[0022] and / or, no whitening occurs after immersion in water at 25°C for 72 hours.

[0023] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0024] An embodiment of the present invention provides a UV-curable pressure-sensitive adhesive for dressings and a preparation method thereof. The present invention significantly improves the water resistance of the resulting UV-curable pressure-sensitive adhesive by subjecting a UV-curable pressure-sensitive adhesive precursor slurry containing long-chain alkyl acrylate monomers to step-by-step illumination within two specific wavelength ranges and under appropriate illumination parameters. Furthermore, no residual adhesive remains after peeling, thereby meeting the use requirements of pressure-sensitive adhesives for dressings and providing a new process for the preparation of UV-curable pressure-sensitive adhesives. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0026] Unless otherwise specified, all raw materials, reagents, instruments, and equipment used in the present invention can be purchased commercially or prepared by existing methods. Furthermore, unless otherwise specified or specified, the steps and parameters involved in the present invention can be carried out according to the prior art UV-curable pressure-sensitive adhesive preparation process or directly using existing equipment, and will not be detailed in this document.

[0027] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present invention only and are not intended to limit the scope of the invention. The experimental methods in the following examples where specific conditions are not specified are generally measured in accordance with national standards. If there are no corresponding national standards, then the methods are carried out in accordance with general international standards, conventional conditions, or the conditions recommended by the manufacturer.

[0028] Example 1

[0029] This example provides a UV-curable pressure-sensitive adhesive for a dressing. The preparation method of the UV-curable pressure-sensitive adhesive for a dressing comprises the following steps:

[0030] Step (1): mixing tert-butyl acrylate, vinyl acetate, butyl acrylate, isooctyl acrylate, acrylic acid, the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms, and a photocuring agent to obtain a first mixture;

[0031] Step (2): stirring and mixing the first mixed material accounting for 58 wt% of the total amount of the first mixed material, the initiator accounting for 58 wt% of the total amount of the initiator, and the organic solvent accounting for 77 wt% of the total amount of the organic solvent at a temperature of 78.5° C. for 1.5 h, then pre-mixing the remaining first mixed material, the remaining initiator, and the remaining organic solvent and adding them dropwise to the reaction system and continuing to stir for 5 h to obtain the UV-curable pressure-sensitive adhesive precursor slurry;

[0032] Step (3): The UV-curable pressure-sensitive adhesive precursor slurry obtained in step (2) is evenly coated on a polyester film substrate with a coating thickness of 20 μm, and then treated in an oven at 110° C. for 10 minutes to remove excess solvent; the polyester film substrate containing the UV-curable pressure-sensitive adhesive precursor slurry is then placed 25 cm below a light source, and subjected to a first light irradiation treatment at a wavelength of 254 nm, and then subjected to a second light irradiation treatment at a wavelength of 365 nm, to obtain the UV-curable pressure-sensitive adhesive;

[0033] The weight ratio of the tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid and the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms is 12:14:17:33:10:8, and the added weight of the photocuring agent accounts for 0.4wt% of the total weight of the six monomers of tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid and the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms. %, the added weight of the initiator accounts for 0.2wt% of the total weight of the six monomers of tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid and the acrylate monomers containing a long-chain alkyl group of 10 to 13 carbon atoms, and the added weight of the organic solvent accounts for 1.2 times the total weight of the six monomers of tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid and the acrylate monomers containing a long-chain alkyl group of 10 to 13 carbon atoms;

[0034] The acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms is lauryl acrylate, the initiator is azobisisobutyronitrile, and the organic solvent is composed of ethyl acetate and cyclohexane in a volume ratio of 3:2;

[0035] The working condition parameters of the first light treatment include: light exposure time of 115s, light radiation power density of 5mW·cm -2 The working condition parameters of the second light treatment include: illumination time of 40s, light radiation power density of 1.5mW·cm -2 .

[0036] Example 2

[0037] This example provides a UV-curable pressure-sensitive adhesive for a dressing. The preparation method of the UV-curable pressure-sensitive adhesive for a dressing comprises the following steps:

[0038] Step (1): mixing tert-butyl acrylate, vinyl acetate, butyl acrylate, isooctyl acrylate, acrylic acid, the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms, and a photocuring agent to obtain a first mixture;

[0039] Step (2): stirring and mixing the first mixed material accounting for 55 wt% of the total amount of the first mixed material, the initiator accounting for 55 wt% of the total amount of the initiator, and the organic solvent accounting for 75 wt% of the total amount of the organic solvent at a temperature of 75° C. for 2 h, then pre-mixing the remaining first mixed material, the remaining initiator, and the remaining organic solvent and adding them dropwise to the reaction system and continuing to stir for 5.5 h to obtain the UV-curable pressure-sensitive adhesive precursor slurry;

[0040] Step (3): The UV-curable pressure-sensitive adhesive precursor slurry obtained in step (2) is evenly coated on a polyester film substrate with a coating thickness of 20 μm, and then treated in an oven at 110° C. for 10 minutes to remove excess solvent; the polyester film substrate containing the UV-curable pressure-sensitive adhesive precursor slurry is then placed 25 cm below a light source, and subjected to a first light irradiation treatment at a wavelength of 254 nm, and then subjected to a second light irradiation treatment at a wavelength of 365 nm, to obtain the UV-curable pressure-sensitive adhesive;

[0041] The weight ratio of the tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid, and the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms is 10:12:16:30:8:5, and the added weight of the photocuring agent accounts for 0.3wt% of the total weight of the six monomers of tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid, and the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms. The weight of the initiator added is 0.3 wt % of the total weight of the six monomers consisting of tert-butyl acrylate, vinyl acetate, butyl acrylate, isooctyl acrylate, acrylic acid, and the acrylate monomers having a long-chain alkyl group of 10 to 13 carbon atoms; the weight of the organic solvent added is 1.0 times the total weight of the six monomers consisting of tert-butyl acrylate, vinyl acetate, butyl acrylate, isooctyl acrylate, acrylic acid, and the acrylate monomers having a long-chain alkyl group of 10 to 13 carbon atoms;

[0042] The acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms is acrylate, the initiator is azobisisobutyronitrile, and the organic solvent is composed of ethyl acetate and cyclohexane in a volume ratio of 2:1;

[0043] The working condition parameters of the first light treatment include: light exposure time of 90s, light radiation power density of 6mW·cm-2 The working condition parameters of the second light treatment include: illumination time of 30s, light radiation power density of 2mW·cm -2 .

[0044] Example 3

[0045] This example provides a UV-curable pressure-sensitive adhesive for a dressing. The preparation method of the UV-curable pressure-sensitive adhesive for a dressing comprises the following steps:

[0046] Step (1): mixing tert-butyl acrylate, vinyl acetate, butyl acrylate, isooctyl acrylate, acrylic acid, the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms, and a photocuring agent to obtain a first mixture;

[0047] Step (2): stirring and mixing the first mixed material accounting for 60 wt% of the total amount of the first mixed material, the initiator accounting for 60 wt% of the total amount of the initiator, and the organic solvent accounting for 80 wt% of the total amount of the organic solvent at a temperature of 80° C. for 1 hour, and then pre-mixing the remaining first mixed material, the remaining initiator, and the remaining organic solvent and adding them dropwise to the reaction system and continuing to stir for 4.5 hours to obtain the UV-curable pressure-sensitive adhesive precursor slurry;

[0048] Step (3): The UV-curable pressure-sensitive adhesive precursor slurry obtained in step (2) is evenly coated on a polyester film substrate with a coating thickness of 20 μm, and then treated in an oven at 110° C. for 10 minutes to remove excess solvent; the polyester film substrate containing the UV-curable pressure-sensitive adhesive precursor slurry is then placed 25 cm below a light source, and subjected to a first light irradiation treatment at a wavelength of 254 nm, and then subjected to a second light irradiation treatment at a wavelength of 365 nm, to obtain the UV-curable pressure-sensitive adhesive;

[0049] The weight ratio of the tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid and the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms is 14:15:20:35:12:10, and the added weight of the photocuring agent accounts for 0.3wt% of the total weight of the six monomers of tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid and the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms. %, the added weight of the initiator accounts for 0.5wt% of the total weight of the six monomers of tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid and the acrylate monomers containing a long-chain alkyl group of 10 to 13 carbon atoms, and the added weight of the organic solvent accounts for 1.5 times the total weight of the six monomers of tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid and the acrylate monomers containing a long-chain alkyl group of 10 to 13 carbon atoms;

[0050] The acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms is acrylate, the initiator is azobisisobutyronitrile, and the organic solvent is composed of ethyl acetate and cyclohexane in a volume ratio of 4:1;

[0051] The working condition parameters of the first light treatment include: the light treatment time is 120s, the light radiation power density is 4mW·cm -2 The working condition parameters of the second light treatment include: illumination time of 45s, light radiation power density of 1mW·cm -2 .

[0052] Comparative Example 1

[0053] This example provides a UV-curable pressure-sensitive adhesive for dressing and a preparation method thereof, which differs from Example 1 only in that:

[0054] (1) The light treatment was performed only in the wavelength range of 254 nm, the illumination time was 155 s, and the light radiation power density was 6 mW cm -2 .

[0055] Comparative Example 2

[0056] This example provides a UV-curable pressure-sensitive adhesive for dressing and a preparation method thereof, which differs from Example 1 only in that:

[0057] (1) The light treatment was performed only in the wavelength range of 365 nm, the illumination time was 155 s, and the light radiation power density was 2 mW cm -2 .

[0058] Comparative Example 3

[0059] This example provides a UV-curable pressure-sensitive adhesive for dressing and a preparation method thereof, which differs from Example 1 only in that:

[0060] (1) The illumination time of the first illumination treatment is adjusted to 40s;

[0061] (2) The illumination time of the second illumination treatment is adjusted to 115s.

[0062] Comparative Example 4

[0063] This example provides a UV-curable pressure-sensitive adhesive for dressing and a preparation method thereof, which differs from Example 1 only in that:

[0064] (1) No lauryl acrylate was added.

[0065] Test Example 1

[0066] In this example, the pressure-sensitive adhesives obtained in Examples 1 to 3 and Comparative Examples 1 to 4 were subjected to water resistance and skin adhesion tests. The test methods are as follows:

[0067] Water resistance test: After removing the release paper, immerse the pressure-sensitive tape directly in deionized water at 25°C for 72 hours. Remove the tape and observe whether the surface turns white.

[0068] Skin adhesion test: After 24 hours of application, observe whether there is redness, swelling, or residual adhesive.

[0069] The test results are shown in Table 1.

[0070] Table 1

[0071] Test samples Water resistance test Skin test Example 1 No whitening No redness or swelling, no residual glue Example 2 No whitening No redness or swelling, no adhesive residue Example 3 No whitening No redness or swelling, no residual glue Comparative Example 1 White No redness or swelling but residual glue Comparative Example 2 White No redness or swelling but residual glue Comparative Example 3 White No redness or swelling but residual glue Comparative Example 4 White No redness or swelling but residual glue

[0072] As can be seen from Table 1, compared with Comparative Examples 1 to 4, the pressure-sensitive adhesives obtained in Examples 1 to 3 of the present invention significantly improve the water resistance of the obtained UV-curable pressure-sensitive adhesives by step-irradiating the UV-curable pressure-sensitive adhesive precursor slurry containing long-chain alkyl acrylate monomers in two specific wavelength ranges and under appropriate illumination parameters. No residual adhesive remains after peeling, and the pressure-sensitive adhesives can meet the requirements for use of pressure-sensitive adhesives for dressings.

[0073] Test Example 2

[0074] In this example, the peel strength of the pressure-sensitive adhesives obtained in Examples 1 to 3 above was further tested with reference to the test method in Appendix B of YY / T 0148-2006 "General Requirements for Medical Adhesive Tapes". The test results are shown in Table 2.

[0075] Table 2

[0076] Test samples Peel strength (N / cm) Example 1 2.6 Example 2 1.8 Example 3 2.2

[0077] As shown in Table 2, the peel strength of the pressure-sensitive adhesive provided by the embodiments of the present invention is ≥1.8 N / cm, and the peel strength of Example 1 is the highest, reaching 2.6 N / cm, which can fully meet the use requirements of medical tape (>1.0 N / cm).

[0078] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in a range format is only for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention; therefore, the range description should be considered to have specifically disclosed all possible subranges and single numerical values ​​within the range. For example, the description of a range from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. In addition, whenever a numerical range is indicated herein, it is intended to include any cited numeral (fractional or integer) within the indicated range.

[0079] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for preparing a UV-curable pressure-sensitive adhesive for a dressing, characterized in that: The preparation method of the ultraviolet light-curable pressure-sensitive adhesive for dressing comprises the following steps: The UV-curable pressure-sensitive adhesive precursor slurry is subjected to a first light treatment at a wavelength range of 254±2nm, and then subjected to a second light treatment at a wavelength range of 365±2nm to obtain the UV-curable pressure-sensitive adhesive; The working condition parameters of the first light treatment include: light exposure time of 90-120s, light radiation power density of 4-6mW·cm-2; the working condition parameters of the second light treatment include: light exposure time of 30-45s, light radiation power density of 1-2mW·cm-2; The ultraviolet light-curable pressure-sensitive adhesive precursor slurry includes an acrylate monomer containing a long-chain alkyl group with 10 to 13 carbon atoms.

2. The method for preparing the UV-curable pressure-sensitive adhesive for dressing according to claim 1, characterized in that: The working condition parameters of the first light treatment include: light exposure time of 115s, light radiation power density of 5mW·cm-2.

3. The method for preparing the UV-curable pressure-sensitive adhesive for dressing according to claim 1, wherein: The working condition parameters of the second light treatment include: light exposure time of 40s, light radiation power density of 1.5mW·cm-2.

4. The method for preparing a UV-curable pressure-sensitive adhesive for dressing according to any one of claims 1 to 3, characterized in that: The preparation of the UV-curable pressure-sensitive adhesive precursor slurry includes the following steps: Mixing tert-butyl acrylate, vinyl acetate, butyl acrylate, isooctyl acrylate, acrylic acid, the acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms, and a light curing agent to obtain a first mixture; The first mixed material accounting for 55-60wt% of the total amount of the first mixed material, the initiator accounting for 55-60wt% of the total amount of the initiator, and the organic solvent accounting for 75-80wt% of the total amount of the organic solvent are stirred and mixed at a temperature of 75-80°C for 1-2 hours, and then the remaining first mixed material, the remaining initiator and the remaining organic solvent are pre-mixed and added dropwise to the reaction system and continued to stir for 4.5-5.5 hours to obtain the UV-curable pressure-sensitive adhesive precursor slurry.

5. The method for preparing the UV-curable pressure-sensitive adhesive for dressing according to claim 4, characterized in that: The weight ratio of the tert-butyl acrylate, the vinyl acetate, the butyl acrylate, the isooctyl acrylate, the acrylic acid, and the acrylic ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms is (10 to 14): (12 to 15): (16 to 20): (30 to 35): (8 to 12): (5 to 10).

6. The method for preparing the UV-curable pressure-sensitive adhesive for dressing according to claim 4, characterized in that: The added weight of the photocuring agent accounts for 0.3-0.5 wt % of the total weight of the six monomers of tert-butyl acrylate, vinyl acetate, butyl acrylate, isooctyl acrylate, acrylic acid and the acrylate monomer containing a long-chain alkyl group of 10-13 carbon atoms.

7. The method for preparing the UV-curable pressure-sensitive adhesive for dressing according to claim 4, characterized in that: The weight of the initiator added is 0.2-0.3 wt% of the total weight of the six monomers comprising tert-butyl acrylate, vinyl acetate, butyl acrylate, isooctyl acrylate, acrylic acid, and the acrylate monomers having a long-chain alkyl group with 10-13 carbon atoms; and the weight of the organic solvent added is 1-1.5 times the total weight of the six monomers comprising tert-butyl acrylate, vinyl acetate, butyl acrylate, isooctyl acrylate, acrylic acid, and the acrylate monomers having a long-chain alkyl group with 10-13 carbon atoms.

8. The method for preparing the UV-curable pressure-sensitive adhesive for dressing according to claim 4, characterized in that: The acrylic acid ester monomer containing a long-chain alkyl group of 10 to 13 carbon atoms includes at least one of decaacrylate, decamethacrylate, undecyl acrylate, undecyl methacrylate, dodecyl acrylate, dodecyl methacrylate, tridecyl acrylate, and tridecyl methacrylate; the photocuring agent includes at least one of vinyl benzoin and 4-acryloyloxybenzophenone; the initiator includes azobisisobutyronitrile; and the organic solvent is composed of ethyl acetate and cyclohexane in a volume ratio of (2 to 4): (1 to 2).

9. A UV-curable pressure-sensitive adhesive for dressing, characterized in that: The UV-curable pressure-sensitive adhesive for dressing is prepared by the preparation method of the UV-curable pressure-sensitive adhesive for dressing according to any one of claims 1 to 8.

10. The UV-curable pressure-sensitive adhesive for dressing according to claim 9, characterized in that: The physicochemical property parameters of the UV-curable pressure-sensitive adhesive for dressings include: Peel strength is 1.8~2.6N / cm; and / or, no whitening occurs after immersion in water at 25°C for 72 hours.