Elastic medical adhesive tape and preparation method thereof

Abstract

The invention provides an elastic medical adhesive tape and a preparation method thereof, and relates to the technical field of medical auxiliary materials. The elastic medical adhesive tape comprises a base material layer, an adhesive layer and a release layer, the base material layer is directly an elastic cloth or a composite base material layer prepared by compounding the elastic cloth and a PU film through a hot melt adhesive; the elastic cloth is made of any one or more of PP (polypropylene), POE (polyolefin elastomer), TPU (thermoplastic polyurethane), TPEE (thermoplastic polyester elastomer) and SEBS (styrene-ethylene-butylene-styrene); the elastic cloth meets the conditions that the gram weight is 50-80 g, and the stretch rate is larger than 90% (when 5N force is applied). The elastic medical adhesive tape has the advantages of good air permeability, good elasticity, high mechanical strength and proper peel strength and holding power.

Description

Technical Field

[0001] The present application relates to the technical field of medical auxiliary materials, and in particular to an elastic medical tape and a preparation method thereof. Background Art

[0002] Medical tape is a common medical auxiliary material, currently used in a wide range of applications, including bandages, navel patches, infusion patches, sports bandages, and plaster bases. Medical tape generally requires the following properties: adhesion to prevent it from separating from the skin during exercise, leaving the wound unprotected; breathability to increase comfort and reduce the slowing of wound recovery caused by moisture retention; and water resistance to prevent the tape from falling off due to splashing or sweating.

[0003] Medical tapes mainly include cloth tapes, transparent tapes, elastic tapes, etc. Among them, the base material of elastic tapes usually uses elastic fiber materials, such as elastic cellulose or elastic polyester fiber, etc. However, the current medical tapes have poor breathability. Therefore, it is necessary to provide a new type of elastic medical tape and its preparation method. Summary of the Invention

[0004] The purpose of this application is to address the deficiencies of the existing technology and provide an elastic medical tape and a preparation method thereof, wherein the elastic medical tape has good air permeability, good elasticity, high mechanical strength, and appropriate peel strength and adhesion.

[0005] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] In one aspect, an elastic medical tape comprises a substrate layer, an adhesive layer and a release layer; wherein: the substrate layer is directly an elastic cloth or a composite substrate layer made by laminating an elastic cloth and a PU film with a hot melt adhesive;

[0007] The elastic fabric is made of any one or more materials selected from the group consisting of PP (polypropylene), POE (polyolefin elastomer), TPU (thermoplastic polyurethane elastomer), TPEE (polyester elastomer), and SEBS (styrene / ethylene / butadiene copolymer).

[0008] The elastic fabric meets the following requirements: a gram weight of 49 to 81 g, and a stretching rate greater than 90% when a force of 5 N is applied.

[0009] Furthermore, the elastic fabric is a meltblown fabric.

[0010] Furthermore, the POE is a copolymer of butene and octene.

[0011] Furthermore, the TPU is composed of hard segments and soft segments; wherein,

[0012] The hard segment in the TPU is at least one of MDI (diphenylmethane diisocyanate), HDI (hexamethylene diisocyanate), IPDI (isophorone diisocyanate), and NDI (naphthalene diisocyanate); the soft segment is at least one of polyester polyol, polycaprolactone diol, polyether polyol, and polyolefin diol; for example, the soft segment can be composed of a soft segment polycaprolactone diol and a hard segment HDI block, a polycaprolactone diol and IPDI block, a polycaprolactone diol and NDI block, a polyester polyol and MDI block, a polycaprolactone diol and HDI and IPDI block, and the like.

[0013] Furthermore, the TPEE is composed of hard segments and soft segments; wherein,

[0014] The hard segment in the TPEE is PBT (polybutylene terephthalate); the soft segment is at least one of PEG (polyethylene glycol), PPG (polyether polyol), PTMG (polybutylene glycol), PLA (polylactide), PGA (polyglycolic acid), and PCL (polycaprolactone); for example, it can be composed of a hard segment PBT and a soft segment PEG block, a PBT and PGA block, a PBT and PLA block, a PBT and PPG block, a PBT and PTMG block, a PBT and PCL block, a PBT and PGA and PEG block, and the like.

[0015] Furthermore, the SEBS consists of polystyrene terminal segments and ethylene-butylene copolymer middle elastic blocks.

[0016] Preferably, the material of the elastic fabric layer is any one of TPU, TPEE, SEBS, PP / TPU, PP / POE, PP / TPEE, PP / SEBS, POE / TPU, TPU / TPEE, TPU / SEBS, TPEE / SEBS, SBS / SEBS, PP / POE / TPU, PP / TPEE / SEBS, more preferably any one of TPU, TPEE, PP / TPU, POE / TPU, TPU / SEBS; wherein,

[0017] When the material of the elastic fabric layer is PP / TPU, the mass ratio of PP to TPU is (25-35):

[0018] (65-75); more preferably, the mass ratio of PP to TPU is 30:70;

[0019] When the material of the elastic fabric layer is POE / TPU, the mass ratio of POE to TPU is (15-35) (65-85); more preferably, the mass ratio of POE to TPU is 20:80.

[0020] When the material of the elastic fabric layer is TPU / SEBS, the mass ratio of TPU to SEBS is (50-65):(35-50); more preferably, the mass ratio of TPU to SEBS is 60:40.

[0021] Preferably, when the material of the elastic fabric layer is TPU, the following conditions are met: the weight of the elastic fabric layer is 50 to 80 g / m 2 , the stretching rate is greater than 90% (when 5N force is applied); more preferably, the weight of the elastic fabric layer is 70±1g / m 2 , the elongation is greater than 92% (when 5N force is applied).

[0022] Preferably, when the material of the elastic fabric layer is TPEE, the following conditions are met: the gram weight of the elastic fabric layer is 70±1 g / m 2 , the elongation is greater than 90% (when 5N force is applied).

[0023] Preferably, when the material of the elastic fabric layer is PP / TPU, the following conditions are met: the weight of the elastic fabric layer is 50±1g / m 2 , the elongation is greater than 90% (when 5N force is applied).

[0024] Preferably, when the material of the elastic fabric layer is POE / TPU, the following conditions are met: the weight of the elastic fabric layer is 60±1g / m 2 , the elongation is greater than 90% (when 5N force is applied).

[0025] Preferably, when the material of the elastic fabric layer is TPU / SEBS, the following conditions are met: the gram weight of the elastic fabric layer is 80±1 g / m 2 , the elongation is greater than 90% (when 5N force is applied).

[0026] Furthermore, the PU film has a gram weight of 20 to 30 g / m 2 , the elongation is greater than 90% (when 5N force is applied).

[0027] Furthermore, the hot melt adhesive is PUR hot melt adhesive or PE hot melt adhesive.

[0028] Furthermore, the adhesive layer material is any one or a combination of polyacrylic acid, plastid, collagen-based glue, hyaluronic acid glue, synthetic biological adhesive, natural rubber or silicone.

[0029] Furthermore, the release layer is a release paper or a release film, and the release layer material includes but is not limited to poly PE, BOPP or PET.

[0030] In another aspect, a method for preparing an elastic medical tape comprises the following steps:

[0031] Any one or more materials selected from S1, PP, POE, TPU, TPEE, and SEBS are melt-extruded and spun into a web using a melt-blowing method to obtain an elastic fabric, which is directly used as the substrate layer; or PUR hot melt adhesive or PE hot melt adhesive is applied between the elastic fabric and the PU film, which is then hot-pressed and cooled to solidify to obtain a composite substrate layer;

[0032] S2. Using a coating process, the solvent-based adhesive layer material is evenly coated on the release surface of the release layer;

[0033] S3. Compounding the substrate or composite substrate layer obtained in step S1 with the product obtained in step S2 by a roller press at room temperature, and then drying at low temperature to obtain the medical tape.

[0034] Furthermore, in step S1, during the melt extrusion process, the screw speed is 5-30 r / min, the screw temperature in the first zone is 80-190°C, the second zone is 150-270°C, the third zone is 170-270°C, the fourth zone is 170-270°C, the fifth zone is 170-270°C, and the extrusion die head temperature is 200-280°C.

[0035] Furthermore, in step S1, during the spinning process, the hot air pressure is 5-30 MPa, the hot air temperature is 210-270° C., the cooling temperature is 5-25° C., and the winding speed is 5-30 m / min.

[0036] Furthermore, in step S1, the heating range of the PUR hot melt adhesive is 70°C to 145°C, and the pressure range is 5 to 10 MPa; the heating range of the PE hot melt adhesive is 55°C to 90°C, and the pressure range is 5 MPa to 10 MPa.

[0037] Furthermore, in step S1, PP, POE, TPU, TPEE, and SEBS may be dried as needed before melt extrusion.

[0038] Furthermore, in step S2, the amount of glue applied is 30 to 50 g / m 2 .

[0039] Furthermore, in step S3, the roller press applies a pressure of 0.5 to 1.5 MPa.

[0040] Furthermore, in step S3, the temperature of low-temperature drying is not higher than 60°C.

[0041] Compared with the prior art, this application has the following beneficial effects:

[0042] 1. The present application provides an elastic medical tape having good air permeability, good elasticity, high mechanical strength, and suitable peel strength and adhesion.

[0043] 2. The elastic medical tape provided in this application is made of an elastic fabric made of one or more materials selected from PP, POE, TPU, TPEE, and SEBS as the base material layer. The elastic fabric has a gram weight of 50 to 80 g, a stretch rate greater than 90% (when a force of 5 N is applied), an elongation at break greater than 400%, and an air permeability of 200 to 1500 L / m. 2 s, elastic recovery rate greater than 85%. Compared with conventional medical tapes, the medical tape of the present application has better breathability. The combination of the two materials not only enables the medical tape to achieve higher breathability and increase comfort, but also improves elasticity and strength.

[0044] 3. In the elastic medical tape provided in this application, PUR hot melt adhesive or PE hot melt adhesive is applied between the elastic cloth and the PU film to prepare the base material layer by compounding them. By optimizing the composite process parameters, the reduction of the material's air permeability can be avoided and its strength and elasticity can be improved to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a SEM image of the medical tape in Example 1 of the present application;

[0046] Figure 2 This is an SEM image of the medical tape in Example 6 of the present application. DETAILED DESCRIPTION

[0047] The following non-limiting examples are provided to enable those skilled in the art to more fully understand the present application, but are not intended to limit the present application in any way. The following contents are merely illustrative of the scope of protection claimed in the present application. Those skilled in the art may make various changes and modifications to the invention of the present application based on the disclosed contents, and such changes and modifications shall also fall within the scope of protection claimed in the present application.

[0048] In the present application, the adhesive layer material is any one or a combination of polyacrylic acid, plastid, collagen-based glue, hyaluronic acid glue, synthetic bioadhesive, natural rubber or silicone. In the following specific embodiments, the adhesive layer material is commercially available solvent-based polyacrylic acid, which does not constitute a limitation on the present application. Replacing it with any other limited material can achieve the effect of the present application. In addition, the release layer is release paper or release film, which are conventional release paper or release film materials in the field, such as PE, BOPP or PET, etc., or other materials, without special limitations. Those skilled in the art can adaptably modify it based on their understanding of the present application scheme and it should be within the scope of protection of the present application. In the following specific embodiments, the release layer is PET release film, which does not constitute a limitation on the present application.

[0049] The present invention is further described below by way of specific examples. Unless otherwise specified, the various chemical reagents used in the examples of the present invention were obtained through conventional commercial channels.

[0050] Example 1

[0051] An elastic medical tape comprising a substrate layer, an adhesive layer of polyacrylic acid and a PET release film;

[0052] Among them, the base material layer is TPU meltblown non-woven fabric: the base material layer has a gram weight of 70.2g / m 2 , the elongation is 97.8% (when 5N force is applied).

[0053] The preparation method of elastic medical tape is as follows:

[0054] S1, TPU (soft segment polycaprolactone diol, hard segment HDI) was dried at 120°C and then melt-extruded. The resulting TPU elastic fabric layer was then melt-blown. The screw speed during the melt extrusion process was 10 r / min; the screw temperatures in the first zone were 180°C, the second zone was 220°C, the third zone was 235°C, the fourth zone was 235°C, and the fifth zone was 235°C. The extrusion die temperature was 255°C. During the spinning process, the hot air pressure was 10 MPa, the hot air temperature was 260°C, the cooling temperature was 25°C, and the winding speed was 10 m / min.

[0055] S2, use the coating process to evenly coat the solvent-based polyacrylic acid on the release surface of the PET release film, with a coating amount of 50g / m 2 .

[0056] S3, after the base material obtained in step S1 and the product obtained in step S2 were compounded by a roller press at room temperature, they were dried at a low temperature of 60° C. (to avoid thermal damage) to obtain the medical tape, the SEM image of which is shown as follows: Figure 1 The roller press applies a pressure of 1.0 MPa.

[0057] Example 2

[0058] An elastic medical tape comprising a composite substrate layer, an adhesive layer of polyacrylic acid and a PET release film;

[0059] Among them, the composite substrate layer is made of TPU meltblown non-woven fabric and PU film compounded by PUR hot melt adhesive: the gram weight of the composite substrate layer is 80.1g / m 2 , of which the TPU layer is 60.1g / m 2 , PU film weight is 20g / m 2 , the elongation is 98.1% (when 5N force is applied).

[0060] The preparation method of the elastic medical tape is the same as that of Example 1. The difference from Example 1 is that after the TPU elastic fabric layer is obtained in step S1, PUR hot melt adhesive is applied between the TPU layer and the PU film, and then cooled and solidified after hot pressing to obtain a composite substrate layer. The amount of PUR adhesive applied is 3g / m 2 , the heating temperature is 105℃ and the pressure is 5MPa.

[0061] Example 3

[0062] An elastic medical tape comprising a substrate layer, an adhesive layer of polyacrylic acid and a PET release film;

[0063] Among them, the base material layer is TPEE meltblown non-woven fabric; the base material layer has a gram weight of 69.7g / m 2 , the elongation is 95.2% (when 5N force is applied).

[0064] The preparation method of elastic medical tape is as follows:

[0065] S1 and TPEE (hard segment: PBT, soft segment: PEG) were dried at 120°C and then melt-extruded. The resulting TPEE elastic fabric layer was then melt-blown. The screw speed during the melt extrusion process was 15 rpm. The screw temperatures in the first zone were 190°C, the second zone 230°C, the third zone 250°C, the fourth zone 270°C, and the fifth zone 270°C. The extrusion die temperature was 280°C. During the spinning process, the hot air pressure was 15 MPa, the hot air temperature was 270°C, the cooling temperature was 10°C, and the winding speed was 10 m / min.

[0066] S2, use the coating process to evenly coat the solvent-based polyacrylic acid on the release surface of the PET release film, with a coating amount of 50g / m 2 .

[0067] S3. Compounding the substrate obtained in step S1 and the product obtained in step S2 by a roller press at room temperature, and then drying at a low temperature of 60° C. to obtain the medical tape. The roller press applies a pressure of 1.0 MPa.

[0068] Example 4

[0069] An elastic medical tape comprising a substrate layer, an adhesive layer of polyacrylic acid and a release paper;

[0070] Among them, the substrate layer is TPEE meltblown non-woven fabric; the gram weight of the substrate layer is 69.8g / m 2 , the elongation is 95.3% (when 5N force is applied).

[0071] The preparation method of the elastic medical tape is the same as that of Example 3, except that the hard segment of TPEE is PBT and the soft segment is PLA.

[0072] Example 5

[0073] An elastic medical tape comprising a substrate layer, an adhesive layer of polyacrylic acid and a release paper;

[0074] Among them, the substrate layer is TPEE meltblown non-woven fabric; the gram weight of the substrate layer is 69.9g / m 2 , the elongation is 94.9% (when 5N force is applied).

[0075] The preparation method of the elastic medical tape is the same as that of Example 3, except that the hard segment of TPEE is PBT and the soft segment is PGA.

[0076] Example 6

[0077] An elastic medical tape comprising a substrate layer, an adhesive layer of polyacrylic acid and a PET release film;

[0078] Among them, the base material layer is PP / TPU (PP, TPU mass ratio is 30:70) meltblown non-woven fabric: the base material layer has a gram weight of 50.2g / m 2 , the elongation is 90.9% (when 5N force is applied).

[0079] The preparation method of elastic medical tape is as follows:

[0080] S1, PP, and TPU (soft segment polycaprolactone diol, hard segment HDI) were dried at 80°C and then melt-extruded. The resulting PP / TPU elastic fabric layer was then melt-blown. The screw speed during the melt extrusion process was 30 r / min; the screw temperatures in the first zone were 160°C, the second zone was 190°C, the third zone was 230°C, the fourth zone was 230°C, and the fifth zone was 230°C. The extrusion die temperature was 255°C. During the spinning process, the hot air pressure was 15 MPa, the hot air temperature was 260°C, the cooling temperature was 15°C, and the winding speed was 30 m / min.

[0081] S2, use the coating process to evenly coat the solvent-based polyacrylic acid on the release surface of the PET release film, with a coating amount of 50g / m 2 .

[0082] S3, after the base material obtained in step S1 and the product obtained in step S2 are compounded by a roller press at room temperature, they are dried at a low temperature of 60° C. to obtain the medical tape, the SEM image of which is as follows Figure 2 The roller press applies a pressure of 1.0 MPa.

[0083] Example 7

[0084] The difference from Example 6 is that the mass ratio of PP to TPU in the PP / TPU meltblown nonwoven fabric of the substrate layer is 25:75, and the gram weight of the substrate layer is 50.1 g / m 2 , the elongation is 90.4% (when 5N force is applied).

[0085] Example 8

[0086] The difference from Example 6 is that the mass ratio of PP to TPU in the PP / TPU meltblown nonwoven fabric of the substrate layer is 35:65. The gram weight of the substrate layer is 50.1 g / m 2 , the elongation is 90.1% (when 5N force is applied).

[0087] Example 9

[0088] The difference from Example 6 is that the mass ratio of PP to TPU in the PP / TPU meltblown nonwoven fabric of the substrate layer is 20:80. The gram weight of the substrate layer is 50.2 g / m 2 , the elongation is 87.2% (when 5N force is applied).

[0089] Example 10

[0090] The difference from Example 6 is that the mass ratio of PP to TPU in the PP / TPU meltblown nonwoven fabric of the substrate layer is 50:50. The gram weight of the substrate layer is 50.2 g / m 2 , elongation is 82.4% (when 5N force is applied)

[0091] Example 11

[0092] An elastic medical tape comprising a substrate layer, an adhesive layer of polyacrylic acid and a PET release film;

[0093] Among them, the base material layer is POE / TPU (POE, TPU mass ratio is 20:80) meltblown non-woven fabric: the base material layer has a gram weight of 60.1g / m 2 , the elongation is 92.5% (when 5N force is applied).

[0094] The preparation method of elastic medical tape is as follows:

[0095] S1, POE, and TPU (soft segment polycaprolactone diol, hard segment HDI) were melt-extruded after drying at 70°C and then melt-blown to form a web, producing the PP / POE elastic fabric layer. The screw speed during the melt extrusion process was 30 r / min; the screw temperatures were 155°C in the first zone, 185°C in the second zone, 225°C in the third zone, 230°C in the fourth zone, and 230°C in the fifth zone; the extrusion die temperature was 250°C; and the hot air pressure and temperature during the spinning process were 20 MPa, 260°C, 13°C, and 20 m / min, respectively.

[0096] S2, use the coating process to evenly coat the solvent-based polyacrylic acid on the release surface of the PET release film, with a coating amount of 50g / m 2 .

[0097] S3. Compounding the substrate obtained in step S1 and the product obtained in step S2 by roller pressing at room temperature, and then drying at 60° C. (to avoid thermal damage) to obtain the medical tape. The roller pressing pressure is 1.0 MPa.

[0098] Example 12

[0099] An elastic medical tape comprising a substrate layer, an adhesive layer of polyacrylic acid and a PET release film;

[0100] Among them, the base material layer is TPU / SEBS (TPU, SEBS mass ratio is 60:40) meltblown non-woven fabric: the base material layer has a gram weight of 79.7g / m 2 , the elongation is 92.6% (when 5N force is applied).

[0101] The preparation method of elastic medical tape is as follows:

[0102] S1, TPU (soft segment polycaprolactone diol, hard segment HDI), and SEBS were dried at 80°C and then melt-extruded. The resulting SEBS elastic fabric layer was then melt-blown. The screw speed during the melt extrusion process was 20 r / min; the screw temperatures were 140°C in the first zone, 170°C in the second zone, 200°C in the third zone, 200°C in the fourth zone, and 200°C in the fifth zone. The extrusion die temperature was 210°C. The hot air pressure during the spinning process was 12 MPa, the hot air temperature was 255°C, the cooling temperature was 20°C, and the winding speed was 20 m / min.

[0103] S2, use the coating process to evenly coat the solvent-based polyacrylic acid on the release surface of the PET release film, with a coating amount of 50g / m 2 .

[0104] S3. Compounding the substrate obtained in step S1 and the product obtained in step S2 by roller pressing at room temperature, and then drying at 60° C. (to avoid thermal damage) to obtain the medical tape. The roller pressing pressure is 1.0 MPa.

[0105] Example 13

[0106] The difference from Example 1 is that the TPU meltblown non-woven fabric of the substrate layer has a gram weight of 50.0 g and an elongation of 96.2% (when a force of 5 N is applied).

[0107] Example 14

[0108] The difference from Example 1 is that the TPU meltblown non-woven fabric of the substrate layer has a gram weight of 80.0 g and an elongation of 95.2% (when a force of 5 N is applied).

[0109] Comparative Example 1

[0110] An elastic medical tape comprising a substrate layer, an adhesive layer of polyacrylic acid and a PET release film;

[0111] Among them, the base material layer is TPU spunbond non-woven fabric: the base material layer has a gram weight of 70.2g / m 2 , the elongation is 88.7% (when 5N force is applied).

[0112] The preparation method of elastic medical tape is as follows:

[0113] S1, TPU (soft segment polycaprolactone diol, hard segment HDI) was dried at 120°C, melt-extruded, and spun into a web using a spunbond process. After melt extrusion, the TPU fibers were drawn down, laid into a web using airflow, and then bonded using a thermal bonding process. After cooling, the TPU elastic fabric layer was obtained. The screw speed during the melt extrusion process was 20 rpm; the screw temperatures in the first zone were 180°C, the second zone was 220°C, the third zone was 235°C, the fourth zone was 235°C, and the fifth zone was 235°C. The extrusion die temperature was 255°C. The fiber draw ratio was 3x, the draw temperature was 100°C, and the post-web thermal bonding temperature was 180°C, the pressure was 0.5 MPa, and the winding speed was 80 m / min.

[0114] S2, use the coating process to evenly coat the solvent-based polyacrylic acid on the release surface of the PET release film, with a coating amount of 50g / m 2 .

[0115] S3. Compounding the substrate obtained in step S1 and the product obtained in step S2 by a roller press at room temperature, and then drying at a low temperature of 60° C. to obtain the medical tape. The roller press applies a pressure of 1.0 MPa.

[0116] Comparative Example 2

[0117] The difference from Example 1 is that the TPU meltblown non-woven fabric of the substrate layer has a gram weight of 45.1 g and an elongation of 91.1% (when a force of 5 N is applied).

[0118] Comparative Example 3

[0119] The difference from Example 1 is that the TPU meltblown non-woven fabric of the substrate layer has a gram weight of 89.8 g and an elongation of 89.7% (when a force of 5 N is applied).

[0120] Comparative Example 4

[0121] A double-layer elastic composite mask base fabric, which is different from Example 12 in that the base layer is a TPU / SBS (TPU, SBS mass ratio 60:40) meltblown fabric. The base layer has a gram weight of 78.1g / m 2 , the elongation is 77.5% (when 5N force is applied).

[0122] Test example

[0123] The tensile strength, elongation at break, air permeability, peel strength and tack (YY / T 0148-2006), and elastic recovery (YY / T 0148-2006) of the medical tapes obtained in the above examples and comparative examples were tested. The test results are shown in Table 1 below.

[0124] Table 1

[0125]

[0126]

[0127] According to the description of Examples 1-8 and 11-14, the present application selects any one or more of PP, POE, TPU, TPEE, SEBS as the base material layer, which has high elasticity and air permeability. The air permeability of the medical tape prepared using the base material layer is greater than 800L / (m 2 ·s), elastic recovery rate>90%, good air permeability, high elasticity, high comfort, high tensile strength, appropriate peel strength and persistent adhesion.

[0128] According to Examples 6-10, when an elastic fabric made of PP and TPU in a specific ratio is selected as the base material layer, the tensile strength of the obtained medical tape is improved compared to that of TPU alone (Example 13), but the air permeability and elastic recovery rate are reduced, but the air permeability is still maintained at 850 L / (m 2 s) or more, and the elastic recovery rate remained above 90%, demonstrating high elasticity and air permeability. In contrast, when PP and TPU were combined in Examples 9 and 10, the tensile strength, air permeability, and elastic recovery rate of the resulting medical tape decreased when the PP dosage was too little or too much. This indicates that the combination of PP and TPU requires a specific ratio to achieve optimal strength, air permeability, and elasticity.

[0129] According to Examples 13 and 14 and Comparative Examples 2 and 3, when the gram weight and elongation of the TPU meltblown nonwoven fabric are too large, the obtained medical tape has a high tensile strength, but poor air permeability and elasticity; and when the gram weight and elongation of the TPU meltblown nonwoven fabric are too small, the tensile strength and elongation at break of the obtained medical tape are significantly reduced. It can be seen that the elastic fabric of the substrate layer needs to meet the gram weight of 50 to 80 g / m 2, the elongation rate is greater than 90% (when 5N force is applied) in order to prepare the medical tape with high strength, good elasticity and high breathability of the present application and achieve the technical effect of the present application.

[0130] According to Comparative Example 4, Comparative Example 4 uses TPU and SBS to prepare elastic cloth as the base material layer. Although it has the same gram weight as the TPU / SEBS meltblown non-woven fabric in Example 12, the elongation-based elasticity is significantly lower than that of the TPU / SEBS meltblown non-woven fabric. The tensile strength, air permeability, and elasticity of the obtained medical tape are significantly different from those in Example 12. Therefore, not all materials can be used to obtain medical tapes with good elasticity, good air permeability, and high strength.

[0131] In summary, this application uses elastic fabric made of any one or more materials such as PP, POE, TPU, TPEE, and SEBS as the base material layer, and the elastic fabric group meets the gram weight of 50 to 80 g / m 2 When the elongation is greater than 90% (when a force of 5N is applied), a medical tape with high strength, good elasticity, and high breathability can be obtained, achieving the technical effects of this application. There are many combinations of elastic fabric materials, and there are many ways to combine segments of different materials. The embodiments of this application will not be listed one by one. Those skilled in the art, based on a clear understanding of the technical concept of this application, can infer that the elastic fabrics defined above can all achieve the technical effects of this application.

[0132] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, this application is not limited to the above-described embodiments. Any improvements and modifications made by those skilled in the art based on the disclosure of this application, without departing from the scope of this application, should be within the scope of protection of this application.

Claims

1. An elastic medical tape, characterized in that: It includes a substrate layer, an adhesive layer and a release layer; the substrate layer is directly an elastic cloth or a composite substrate layer made by compounding the elastic cloth and PU film with hot melt adhesive; The elastic fabric is made of any one or more materials selected from PP, POE, TPU, TPEE, and SEBS; The elastic fabric meets the following requirements: a gram weight of 49 to 81 g, and a stretching rate greater than 90% when a force of 5 N is applied.

2. The elastic medical tape according to claim 1, characterized in that: The elastic fabric is a meltblown fabric.

3. The elastic medical tape according to claim 1, characterized in that: The POE is a copolymer of butene and octene; the TPU is composed of hard segments and soft segments; the TPEE is composed of hard segments and soft segments; and the SEBS is composed of polystyrene terminal segments and ethylene-butene copolymer middle elastic blocks.

4. The elastic medical tape according to claim 1, characterized in that: The hard segment of the TPU is at least one of MDI, HDI, IPDI, and NDI, and the soft segment is at least one of polyester polyol, polycaprolactone diol, polyether polyol, and polyolefin diol; the hard segment of the TPEE is PBT, and the soft segment is at least one of PEG, PPG, PTMG, PLA, PGA, and PCL.

5. The elastic medical tape according to claim 1, wherein: The PU film has a tensile strength greater than 35N / cm, an elongation at break greater than 500%, a tear strength greater than 40N, a thickness of 80μm, and a gram weight of 20g / m 2 .

6. The elastic medical tape according to claim 1, characterized in that: The adhesive layer material is any one of polyacrylic acid, plastid, collagen-based glue, hyaluronic acid glue, synthetic biological adhesive, natural rubber or silicone, or a combination of several of them.

7. The elastic medical tape according to claim 1, characterized in that: The release layer is release paper or release film.

8. The method for preparing the elastic medical tape according to any one of claims 1 to 7, characterized in that: The following steps are involved: Any one or more materials selected from S1, PP, POE, TPU, TPEE, and SEBS are melt-extruded and spun into a web using a melt-blowing method to obtain an elastic fabric, which is directly used as the substrate layer; Alternatively, PUR hot melt adhesive or PE hot melt adhesive is applied between the elastic fabric and the PU film, and then cooled and solidified after heat pressing to obtain a composite substrate layer; S2. Using a coating process, the solvent-based adhesive layer material is evenly coated on the release surface of the release layer; S3. Compounding the substrate or composite substrate layer obtained in step S1 with the product obtained in step S2 by a roller press at room temperature, and then drying at low temperature to obtain the elastic medical tape.

9. The method for preparing the elastic medical tape according to claim 8, wherein: In step S1, during the melt extrusion process, the screw speed is 5-30 r / min, the screw temperature in the first zone is 80-190°C, the second zone is 150-270°C, the third zone is 170-270°C, the fourth zone is 170-270°C, the fifth zone is 170-270°C, and the extrusion die head temperature is 200-280°C.

10. The method for preparing the elastic medical tape according to claim 8, wherein: In step S1, during the spinning process, the hot air pressure is 5-30 MPa, the hot air temperature is 210-270° C., the cooling temperature is 5-25° C., and the winding speed is 5-30 m / min.

Images