Material for thermal printing wrist strap and preparation method thereof

Abstract

The invention relates to the field of composite materials, and discloses a material for a thermal printing wrist strap and a preparation method of the material. Comprising the following components in parts by weight: 75-95 parts of thermoplastic polyurethane, 20-30 parts of polyether block amide, 5-10 parts of fatty alcohol-polyoxyethylene ether, 5-10 parts of nano silicon dioxide, 3-5 parts of modified nano calcium carbonate, 1-5 parts of a silane coupling agent, 5-10 parts of a thermosensitive coating material, 3-8 parts of a plasticizer, 1-3 parts of a silver ion antibacterial agent and 1-5 parts of a compatilizer. According to the invention, the thermoplastic polyurethane and the polyether block amide are adopted as basic materials, the thermoplastic polyurethane has good flexibility and elasticity, and the polyether block amide provides excellent chemical resistance and low-temperature toughness, so that the tensile strength and the wear resistance of the wrist strap material are effectively improved, and the flexibility and the durability of the wrist strap are also improved; meanwhile, fatty alcohol-polyoxyethylene ether is added as a surfactant, so that the hydrophilicity of the surface of the wrist strap material can be effectively improved, the wrist strap can be more attached to the skin, and the wearing comfort can be improved.

Description

Technical Field

[0001] The present invention relates to the field of composite materials, and particularly to a material for a thermal printing wristband and a preparation method thereof. Background Art

[0002] A wristband is an identity identification band worn on the wrist for identifying the user. Existing wristbands mainly exist in the form of paper sheets, and most are handwritten versions. Traditional handwritten wristbands increase labor costs. The wristbands made of paper materials are thin and not skin-friendly, and are prone to breakage, which not only limits the service life of the wristband, but also may cause incorrect information reading due to blurred or broken information, thus affecting the accuracy and reliability of the information. The wristbands shipped in sheets need to be additionally cut before use, which affects the convenience of use. To solve the above problems, a material for a thermal printing wristband and a preparation method thereof are proposed.

[0003] The above information disclosed in this background art is only used to increase the understanding of the background art of the present invention. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a material for a thermal printing wristband and a preparation method thereof.

[0005] The material for a thermal printing wristband and the preparation method thereof provided by the present invention adopt the following technical solutions:

[0006] A material for a thermal printing wristband, by weight, comprises the following components: 75-95 parts of thermoplastic polyurethane, 20-30 parts of polyether block amide, 5-10 parts of fatty alcohol polyoxyethylene ether, 5-10 parts of nano-silica, 3-5 parts of modified nano-calcium carbonate, 1-5 parts of silane coupling agent, 5-10 parts of thermal printing coating material, 3-8 parts of plasticizer, 1-3 parts of silver ion antibacterial agent, and 1-5 parts of compatibilizer.

[0007] Preferably, the thermal printing coating material comprises 5-10 parts of crystal violet lactone, 10-20 parts of developer activator, 5-10 parts of polyvinyl alcohol, 1-3 parts of silicone oil, 0.5-2 parts of sulfonylurea compound, 5-10 parts of silicon oxide, 0.5-2 parts of antioxidant, and 0.5-2 parts of ultraviolet absorber.

[0008] Preferably, the antioxidant is composed of 60% by weight of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 30% by weight of n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 10% by weight of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite.

[0009] Preferably, the ultraviolet absorber consists of 50% by weight of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 30% by weight of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, and 20% by weight of 2-hydroxy-4-n-octyloxybenzophenone.

[0010] Preferably, the developer activator is any one or a combination of bisphenol A, bisphenol S, and phenolic resin.

[0011] Preferably, the sulfonylurea compound is any one or a combination of benzenesulfonylurea, p-toluenesulfonylurea, phthalylsulfonimide, and 4,4'-bis(benzenesulfonylureido)diphenyl sulfone.

[0012] Preferably, the plasticizer is any one or a combination of dioctyl phthalate and dioctyl adipate.

[0013] Preferably, the compatibilizer is any one or a combination of maleic anhydride grafted styrene-ethylene / butene-styrene block copolymer and maleic anhydride grafted polypropylene.

[0014] A preparation method for a material for a thermal printing wristband, which is applicable to preparing the material for a thermal printing wristband described in any one of the above, is characterized by including the following steps:

[0015] S1. Weigh the raw materials in the stated parts by weight;

[0016] S2. Add thermoplastic polyurethane and polyether block amide into a high-speed mixer, with a rotation speed of 800 - 1000

[0017] rpm, mix for 5 - 10 min, and sequentially add fatty alcohol polyoxyethylene ether, nano-silica, and modified nano-calcium carbonate. After each component is added, the rotation speed is maintained at 800 - 1000 rpm and mixed for 5 min. Then add a silane coupling agent, with a rotation speed of 600 - 800 rpm, and mix for 5 - 10 min. Sequentially add the plasticizer, silver ion antibacterial agent, and compatibilizer, with a rotation speed of 800 - 1000 rpm, and mix for 5 - 10 min to obtain a basic mixture;

[0018] S3. Sequentially add crystal violet lactone, developer activator, polyvinyl alcohol, silicone oil, sulfonylurea compound,

[0019] silica, antioxidant, and ultraviolet absorber into a high-shear mixer. After each component is added, the rotation speed is maintained at 1000 - 1500 rpm and mixed for 5 min. After all components are added, mix for another

[0020] 5 - 10 min to obtain a thermal printing coating slurry;

[0021] S4. The base mixture in S2 is melt-kneaded using a twin-screw extruder at an extrusion temperature of 180 - 220 °C and a screw speed of 100 - 200 rpm. After extrusion, it is cooled and shaped to obtain the base material.

[0022] S5. The thermosensitive coating slurry in S3 is evenly coated on the surface of the base material extruded and formed in S4.

[0023] It is dried at a temperature of 80 - 120 °C to obtain the thermosensitive printing wristband material.

[0024] S6. The thermosensitive printing wristband material in S5 is cut and then wound up.

[0025] In summary, the present invention includes the following beneficial technical effects:

[0026] 1. By using thermoplastic polyurethane and polyether block amide as the base materials, thermoplastic polyurethane has good flexibility and elasticity, while polyether block amide provides excellent chemical resistance and low-temperature toughness. Compared with the related technologies, the tensile strength and wear resistance of the wristband material are effectively improved, and the flexibility and durability of the wristband are also enhanced. At the same time, fatty alcohol polyoxyethylene ether is added as a surfactant, which can effectively increase the hydrophilicity of the surface of the wristband material, thereby making the wristband fit the skin better and being beneficial to improving the wearing comfort.

[0027] 2. By adding thermosensitive coating materials, the traditional paper wristband is transformed into a thermosensitive material, and it can be shipped in a rolled form after molding. Compared with the related technologies, the thermosensitive wristband can achieve thermosensitive printing, which can not only provide higher resolution and clearer text and patterns, ensure that necessary information can be accurately printed even on a smaller wristband, guarantee the accuracy and reliability of information reading, but also effectively save labor costs. At the same time, shipping in a rolled form can effectively reduce the process of manual cutting and processing, which is beneficial to improving the convenience of using the wristband.

[0028] 3. By adding antioxidants and ultraviolet absorbers to the thermosensitive coating materials, the antioxidant mainly protects against internal free radical reactions and prevents the aging phenomenon of the material caused by oxidation during use, while the ultraviolet absorber focuses on protecting against ultraviolet damage in the external environment. By absorbing ultraviolet rays and converting them into heat energy for release, it avoids direct ultraviolet damage to the chemical structure in the thermosensitive layer. Compared with the related technologies, under the combined action of antioxidants and ultraviolet absorbers, the weather resistance of the thermosensitive coating can be effectively enhanced, thereby ensuring the clarity of information printing and the stability of long-term preservation, which is beneficial to extending the service life of the wristband.

[0029] 4. By setting the ratio of antioxidants as 60% by weight of pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 30% by weight of n-octadecyl-3,5-di-tert-butyl-4-hydroxyhydrocinnamate, and 10% by weight of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite. Among them, pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] and n-octadecyl-3,5-di-tert-butyl-4-hydroxyhydrocinnamate can efficiently capture free radicals and prevent the occurrence of chain reactions. Bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite inhibits the oxidation reaction by decomposing peroxides. Compared with the related technology, it not only improves the initial efficacy of the antioxidant but also extends the effective time of the antioxidant, enabling the thermosensitive coating to maintain stable performance for a longer time and reducing the problems of information blurring or fading caused by aging.

[0030] 5. By setting the ratio of ultraviolet absorbers as 50% by weight of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 30% by weight of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, and 20% by weight of 2-hydroxy-4-n-octyloxybenzophenone. Among them, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole and 2-(2'-hydroxy-5'-methylphenyl)benzotriazole belong to benzotriazole ultraviolet absorbers and have good absorption effects on ultraviolet UV-B. 2-hydroxy-4-n-octyloxybenzophenone has strong absorption ability for ultraviolet UV-A. By absorbing ultraviolet rays and converting them into harmless heat for release, compared with the related technology, it effectively prevents the photodegradation of organic components in the thermosensitive coating, thereby improving the weather resistance and service life of the wristband material. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flowchart of a preparation method of a thermosensitive printing wristband material according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The present invention will be further described below in conjunction with the embodiments.

[0033] In the specific implementation process:

[0034] Example 1

[0035] A material for thermal printing wristbands, by weight, includes the following components: 75 parts of thermoplastic polyurethane, 20 parts of polyether block amide, 5 parts of fatty alcohol polyoxyethylene ether, 5 parts of nano-silica, 3 parts of modified nano-calcium carbonate, 1 part of silane coupling agent, 5 parts of crystal violet lactone, 10 parts of bisphenol A, 5 parts of polyvinyl alcohol, 1 part of silicone oil, 0.5 part of benzolsulfonylurea, 5 parts of silicon oxide, 0.5 part of antioxidant, 0.5 part of ultraviolet absorber, 3 parts of dioctyl phthalate, 1 part of silver ion antibacterial agent, 1 part of maleic anhydride grafted polypropylene;

[0036] Among them, the antioxidant consists of 0.3 part of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.15 part of n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 0.05 part of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite;

[0037] It should be noted that pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate can efficiently capture free radicals and prevent the occurrence of chain reactions. Bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite inhibits oxidation reactions by decomposing peroxides, not only improving the initial efficacy of the antioxidant but also extending the effective time of the antioxidant, enabling the thermal sensitive coating to maintain stable performance for a long time and reducing problems such as blurred information or fading caused by aging;

[0038] Among them, the ultraviolet absorber consists of 0.25 part of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 0.15 part of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, and 0.1 part of 2-hydroxy-4-n-octyloxybenzophenone;

[0039] It should be noted that 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole and 2-(2'-hydroxy-5'-methylphenyl)benzotriazole belong to benzotriazole ultraviolet absorbers and have good absorption effects on ultraviolet UV-B. 2-hydroxy-4-n-octyloxybenzophenone has strong absorption ability for ultraviolet UV-A. By absorbing ultraviolet rays and converting them into harmless heat for release, it effectively prevents the photodegradation of organic components in the thermal sensitive coating, thereby improving the weather resistance and service life of the wristband material;

[0040] A preparation method for the material of thermal printing wristbands includes the following steps:

[0041] S1. Weigh the raw materials in the required weight parts;

[0042] S2. Add thermoplastic polyurethane and polyether block amide into a high-speed mixer, with a rotation speed of 800 - 1000

[0043] rpm, mix for 5 - 10 min, successively add fatty alcohol polyoxyethylene ether, nano-silica and modified nano-calcium carbonate. After adding each component, keep the rotation speed at 800 - 1000 rpm and mix for 5 min. Then add silane coupling agent, with a rotation speed of 600 - 800 rpm and mix for 5 - 10 min. Successively add plasticizer, silver ion antibacterial agent and compatibilizer, with a rotation speed of 800 - 1000 rpm and mix for 5 - 10 min to obtain a base mixture;

[0044] S3. Successively add crystal violet lactone, developer activator, polyvinyl alcohol, silicone oil, sulfonylurea compound

[0045] s, silica, antioxidant, ultraviolet absorber into a high-shear mixer. After adding each component, keep the rotation speed at 1000 - 1500 rpm and mix for 5 min. After all components are added, mix for another

[0046] 5 - 10 min to obtain a thermal-sensitive coating slurry;

[0047] S4. Melt and knead the base mixture in S2 using a twin-screw extruder, with an extrusion temperature of 180 - 220 °C and a screw rotation speed of 100 - 200 rpm. After extrusion, cool and shape it to obtain a base material;

[0048] S5. Uniformly coat the thermal-sensitive coating slurry in S3 on the surface of the base material extruded and formed in S4,

[0049] dry it at a temperature of 80 - 120 °C to obtain a thermal-sensitive printing wristband material;

[0050] S6. Cut and wind up the thermal-sensitive printing wristband material in S5;

[0051] It should be noted that when the thermal-sensitive printing wristband roll is put into a full-rotation high-speed printing machine or a digital printing machine, during use, the user's identity information is printed on the thermal-sensitive printing wristband material, which is convenient for machine recognition and system information recording. And through a preset cutting path, a high-speed die cutter can accurately cut the wristband according to the designed size and shape, ensuring that each wristband is complete and has smooth edges. This not only improves the usability but also reduces manual intervention and saves human resource costs.

[0052] Example Two

[0053] Follow the same preparation method as in Example One. The differences from Example One are as follows:

[0054] A material for thermal printing wristbands, by weight, comprises the following components: 85 parts of thermoplastic polyurethane, 25 parts of polyether block amide, 8 parts of fatty alcohol polyoxyethylene ether, 8 parts of nano-silica, 4 parts of modified nano-calcium carbonate, 3 parts of silane coupling agent, 8 parts of crystal violet lactone, 15 parts of bisphenol A, 8 parts of polyvinyl alcohol, 2 parts of silicone oil, 1.5 parts of benzenesulfonylurea, 8 parts of silicon oxide, 1.5 parts of antioxidant, 1.5 parts of ultraviolet absorber, 5 parts of dioctyl phthalate, 2 parts of silver ion antibacterial agent, 3 parts of maleic anhydride grafted polypropylene;

[0055] Among them, the antioxidant consists of 0.9 part of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.45 part of n-octadecyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate, and 0.15 part of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite;

[0056] Among them, the ultraviolet absorber consists of 0.75 part of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 0.45 part of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, and 0.3 part of 2-hydroxy-4-n-octyloxybenzophenone;

[0057] Example 3

[0058] Following the same preparation method as in Example 1, the difference from Example 1 is:

[0059] A material for thermal printing wristbands, by weight, comprises the following components: 95 parts of thermoplastic polyurethane, 30 parts of polyether block amide, 10 parts of fatty alcohol polyoxyethylene ether, 10 parts of nano-silica, 5 parts of modified nano-calcium carbonate, 5 parts of silane coupling agent, 10 parts of crystal violet lactone, 20 parts of bisphenol A, 10 parts of polyvinyl alcohol, 3 parts of silicone oil, 2 parts of benzenesulfonylurea, 10 parts of silicon oxide, 2 parts of antioxidant, 2 parts of ultraviolet absorber, 8 parts of dioctyl phthalate, 3 parts of silver ion antibacterial agent, 5 parts of maleic anhydride grafted polypropylene;

[0060] Among them, the antioxidant consists of 1.2 parts of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.6 part of n-octadecyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate, and 0.2 part of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite;

[0061] Among them, the ultraviolet absorber consists of 1 part of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 0.6 part of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, and 0.4 part of 2-hydroxy-4-n-octyloxybenzophenone;

[0062] Comparative Example 1

[0063] What is different from Component 1 of the Example is:

[0064] A material for a thermal printing wristband, by weight, comprises the following components: 75 parts of thermoplastic polyurethane, 5 parts of fatty alcohol polyoxyethylene ether, 5 parts of nano-silica, 3 parts of modified nano-calcium carbonate, 1 part of silane coupling agent, 5 parts of crystal violet lactone, 10 parts of bisphenol A, 5 parts of polyvinyl alcohol, 1 part of silicone oil, 0.5 part of benzolsulfonylurea, 5 parts of silicon oxide, 0.5 part of antioxidant, 0.5 part of ultraviolet absorber, 3 parts of dioctyl phthalate, 1 part of silver ion antibacterial agent, 1 part of maleic anhydride grafted polypropylene;

[0065] Among them, the antioxidant consists of 0.3 part of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.15 part of n-octadecyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate, and 0.05 part of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite;

[0066] Among them, the ultraviolet absorber consists of 0.25 part of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 0.15 part of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, and 0.1 part of 2-hydroxy-4-n-octyloxybenzophenone;

[0067] Comparative Example 2

[0068] What is different from Component 1 of the Example is:

[0069] A material for a thermal printing wristband, by weight, comprises the following components: 75 parts of thermoplastic polyurethane, 20 parts of polyether block amide, 5 parts of nano-silica, 3 parts of modified nano-calcium carbonate, 1 part of silane coupling agent, 5 parts of crystal violet lactone, 10 parts of bisphenol A, 5 parts of polyvinyl alcohol, 1 part of silicone oil, 0.5 part of benzolsulfonylurea, 5 parts of silicon oxide, 0.5 part of antioxidant, 0.5 part of ultraviolet absorber, 3 parts of dioctyl phthalate, 1 part of silver ion antibacterial agent, 1 part of maleic anhydride grafted polypropylene;

[0070] Among them, the antioxidant consists of 0.3 part of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.15 part of n-octadecyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate, and 0.05 part of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite;

[0071] Among them, the ultraviolet absorber consists of 0.25 part of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 0.15 part of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, and 0.1 part of 2-hydroxy-4-n-octyloxybenzophenone;

[0072] Comparative Example 3

[0073] The difference from Example 1 in terms of components is as follows:

[0074] A material for a thermal printing wristband, by weight, comprises the following components: 75 parts of thermoplastic polyurethane, 5 parts of nano-silica, 3 parts of modified nano-calcium carbonate, 1 part of silane coupling agent, 5 parts of crystal violet lactone, 10 parts of bisphenol A, 5 parts of polyvinyl alcohol, 1 part of silicone oil, 0.5 part of benzolsulfonylurea, 5 parts of silicon oxide, 0.5 part of antioxidant, 0.5 part of ultraviolet absorber, 3 parts of dioctyl phthalate, 1 part of silver ion antibacterial agent, 1 part of maleic anhydride grafted polypropylene;

[0075] Among them, the antioxidant consists of 0.3 part of pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 0.15 part of n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, and 0.05 part of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite;

[0076] Among them, the ultraviolet absorber consists of 0.25 part of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 0.15 part of 2-(2'-hydroxy-5'-methylphenyl) benzotriazole, and 0.1 part of 2-hydroxy-4-n-octyloxybenzophenone;

[0077] Comparative Example 4

[0078] The difference from Example 1 in terms of components is as follows:

[0079] A material for a thermal printing wristband, by weight, comprises the following components: 75 parts of thermoplastic polyurethane, 20 parts of polyether block amide, 5 parts of fatty alcohol polyoxyethylene ether, 5 parts of nano-silica, 3 parts of modified nano-calcium carbonate, 1 part of silane coupling agent, 3 parts of dioctyl phthalate, 1 part of silver ion antibacterial agent, 1 part of maleic anhydride grafted polypropylene;

[0080] Comparative Example 5

[0081] The difference from Example 1 in terms of components is as follows:

[0082] A material for a thermal printing wristband, by weight, comprises the following components: 75 parts of thermoplastic polyurethane, 20 parts of polyether block amide, 5 parts of fatty alcohol polyoxyethylene ether, 5 parts of nano-silica, 3 parts of modified nano-calcium carbonate, 1 part of silane coupling agent, 5 parts of crystal violet lactone, 10 parts of bisphenol A, 5 parts of polyvinyl alcohol, 1 part of silicone oil, 0.5 part of benzolsulfonylurea, 5 parts of silicon oxide, 0.5 part of antioxidant, 3 parts of dioctyl phthalate, 1 part of silver ion antibacterial agent, 1 part of maleic anhydride grafted polypropylene;

[0083] Among them, the antioxidant consists of 0.3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.15 parts of n-octadecyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate, and 0.05 parts of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite;

[0084] Comparative Example 6

[0085] The difference from Example 1 in terms of components is:

[0086] A material for thermal printing wristbands, by weight, comprises the following components: 75 parts of thermoplastic polyurethane, 20 parts of polyether block amide, 5 parts of fatty alcohol polyoxyethylene ether, 5 parts of nano-silica, 3 parts of modified nano-calcium carbonate, 1 part of silane coupling agent, 5 parts of crystal violet lactone, 10 parts of bisphenol A, 5 parts of polyvinyl alcohol, 1 part of silicone oil, 0.5 part of benzolsulfonylurea, 5 parts of silicon oxide, 0.5 part of ultraviolet absorber, 3 parts of dioctyl phthalate, 1 part of silver ion antibacterial agent, 1 part of maleic anhydride grafted polypropylene;

[0087] Among them, the ultraviolet absorber consists of 0.25 parts of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 0.15 parts of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, and 0.1 part of 2-hydroxy-4-n-octyloxybenzophenone;

[0088] Comparative Example 7

[0089] The difference from Example 1 in terms of components is:

[0090] A material for thermal printing wristbands, by weight, comprises the following components: 75 parts of thermoplastic polyurethane, 20 parts of polyether block amide, 5 parts of fatty alcohol polyoxyethylene ether, 5 parts of nano-silica, 3 parts of modified nano-calcium carbonate, 1 part of silane coupling agent, 5 parts of crystal violet lactone, 10 parts of bisphenol A, 5 parts of polyvinyl alcohol, 1 part of silicone oil, 0.5 part of benzolsulfonylurea, 5 parts of silicon oxide, 3 parts of dioctyl phthalate, 1 part of silver ion antibacterial agent, 1 part of maleic anhydride grafted polypropylene;

[0091] Experimental Group 1

[0092] Experimental purpose: To verify the effects of different formulations on the physical properties, chemical stability, and use comfort of the wristband material, and to evaluate the roles of each component in improving the comprehensive performance of the wristband by comparing the data of Examples 1 to 3 and Comparative Examples 1 to 7;

[0093] Experimental method:

[0094] Sample preparation: Prepare the materials according to the formulations of Examples 1 to 3 and Comparative Examples 1 to 7, and operate strictly in accordance with the above preparation method steps;

[0095] Test items:

[0096] Mechanical property tests: Tensile strength, elongation at break, abrasion resistance;

[0097] Weather resistance tests: Evaluate the antioxidant and anti-ultraviolet capabilities of materials through ultraviolet aging tests and oxidation induction period tests;

[0098] Printing effect tests: Evaluate the clarity and durability of the thermal-sensitive coating through actual printing tests.

[0099] Experimental data:

[0100]

[0101]

[0102] Data analysis: The tensile strength and elongation at break of Examples 1 to 3 were significantly higher than those of Comparative Examples 1 to 7, indicating that the addition of polyether block amide and fatty alcohol polyoxyethylene ether improved the flexibility and tensile strength of the material; the abrasion resistance of Examples 1 to 3 was significantly better than that of Comparative Examples 1 to 7, indicating that the addition of nano-silica and modified nano-calcium carbonate effectively enhanced the abrasion resistance of the material; the weather resistance of Examples 1 to 3 was significantly better than that of Comparative Examples 1 to 7, especially in Comparative Examples 5 and 6, where the lack of ultraviolet absorber or antioxidant led to a significant decrease in the weather resistance of the material; the printing clarity and durability of Examples 1 to 3 were significantly better than those of Comparative Examples 1 to 7, especially in Comparative Example 4, where thermal printing could not be achieved due to the lack of thermal-sensitive coating material; the service life of Examples 1 to 3 was significantly better than that of Comparative Examples 1 to 7, especially in Example 3, whose service life exceeded 2 years, far exceeding the service life of Comparative Examples 1 to 7;

[0103] Experimental conclusion: The addition of polyether block amide and fatty alcohol polyoxyethylene ether significantly improved the mechanical properties and abrasion resistance of the wristband material, making it more durable and comfortable to wear. The addition of nano-silica and modified nano-calcium carbonate increased the strength and abrasion resistance of the material and extended the service life. The presence of the thermal-sensitive coating material enabled the wristband to achieve high-quality thermal printing. The synergistic effect of the antioxidant and ultraviolet absorber significantly improved the weather resistance of the material, ensuring that the printed information remained clearly readable for a long time;

[0104] Experimental Group 2

[0105] Experimental purpose:

[0106] Further verify the influence of different formulations on the performance indicators of the wristband material;

[0107] Experimental data of hydrophilicity and skin comfort tests: Evaluate the influence of fatty alcohol polyoxyethylene ether on the hydrophilicity and wearing comfort of the wristband material;

[0108] Component Contact Angle (°) Skin Irritation Score (0 - 5) Example 1 45 1.0 Example 2 40 0.8 Example 3 35 0.6 Comparative Example 1 60 2.5 Comparative Example 2 80 3.5 Comparative Example 3 90 4.0 Comparative Example 4 70 3.0 Comparative Example 5 75 3.3 Comparative Example 6 73 3.1 Comparative Example 7 85 3.8

[0109] Data analysis: The contact angles of Examples 1 to 3 are significantly lower than those of Comparative Examples 1 to 7, indicating that the addition of fatty alcohol polyoxyethylene ether significantly improves the hydrophilicity of the material, making the wristband fit the skin better;

[0110] The skin irritation scores of Examples 1 to 3 are significantly lower than those of Comparative Examples 1 to 7, indicating that the formulated materials of Examples 1 to 3 are more friendly to the skin and have high wearing comfort;

[0111] Antibacterial performance test experimental data: Antibacterial tests were carried out using Escherichia coli and Staphylococcus aureus;

[0112]

[0113]

[0114] Data analysis: The antibacterial rates of Examples 1 to 3 are higher than those of Comparative Examples 1 to 7, especially Comparative Example 4, indicating that the silver ion antibacterial agent plays a positive role in inhibiting bacterial growth;

[0115] Environmental stability test experimental data: The physical properties and information persistence of the wristband were tested under different temperature and humidity conditions;

[0116]

[0117]

[0118] Data analysis: The tensile strength of Examples 1 to 3 under extreme environmental conditions is higher than that of Comparative Examples 1 to 7, indicating that the formulated materials of Examples 1 to 3 have good environmental adaptability;

[0119] Long-term aging test experimental data: Simulate the aging of materials under long-term use conditions;

[0120]

[0121] Data analysis: The mechanical properties of Examples 1 to 3 after accelerated aging are higher than those of Comparative Examples 1 to 7, indicating that antioxidants and ultraviolet absorbers effectively delay the aging process of the material;

[0122] The information persistence of Examples 1 to 3 is significantly better than that of Comparative Examples 1 to 7, indicating that the formulation ratio of the thermosensitive coating material improves the long-term readability of information;

[0123] Experimental conclusion: Fatty alcohol polyoxyethylene ether significantly improves the hydrophilicity and wearing comfort of the material, reduces skin irritation; silver ion antibacterial agent performs excellently in inhibiting bacterial growth, significantly enhancing the antibacterial ability of the wristband; polyether block amide enhances the stability and adaptability of the material in extreme environments; antioxidants and ultraviolet absorbers effectively delay the aging process of the material, extending the service life and information persistence of the wristband;

[0124] Experimental Group Three

[0125] Experimental purpose: To evaluate the effect of different formulations on the thermal stability of the wristband material, and to test by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) to determine the decomposition temperature, weight loss rate and glass transition temperature (Tg) parameters of the material under high temperature conditions;

[0126] Testing equipment: Thermogravimetric analyzer (TGA): used to measure the weight loss of the material during heating, Differential scanning calorimeter (DSC): used to measure the glass transition temperature (Tg), melting point and other thermal properties of the material;

[0127] Testing conditions: Heating rate: 10°C / min;

[0128] Temperature range: Room temperature to 600°C (TGA), Room temperature to 300°C (DSC);

[0129] Thermogravimetric analysis (TGA) data:

[0130]

[0131]

[0132] Differential scanning calorimetry (DSC) data:

[0133]

[0134] Data analysis: The initial decomposition temperature and 5% weight loss temperature of Examples 1 to 3 are significantly higher than those of Comparative Examples 1 to 7, indicating that the formulated materials of Examples 1 to 3 have better thermal stability. Especially in Example 3, the initial decomposition temperature reaches 340°C and the 5% weight loss temperature reaches 370°C, showing excellent high temperature resistance;

[0135] The residual mass of Examples 1 to 3 is lower than that of Comparative Examples 1 to 7, indicating that the formulated materials of Examples 1 to 3 decompose less and have less residue under high temperature conditions, showing good thermal stability;

[0136] The glass transition temperatures and melting points of Examples 1 to 3 are higher than those of Comparative Examples 1 to 7, indicating that the formulated materials of Examples 1 to 3 have better mechanical properties and thermal stability. Especially for Example 3, the glass transition temperature reaches -35°C and the melting point reaches 200°C, showing high thermal stability and mechanical strength.

[0137] The melting enthalpies of Examples 1 to 3 are higher than those of Comparative Examples 1 to 7, indicating that the formulated materials of Examples 1 to 3 absorb more heat during the melting process, showing good thermal stability and energy absorption capacity.

[0138] Experimental summary: The addition of polyether block amide and fatty alcohol polyoxyethylene ether significantly improves the thermal stability of the wristband material, making it not easily decomposed under high-temperature conditions and showing excellent high-temperature resistance performance.

[0139] The synergistic effect of the antioxidant and ultraviolet absorber effectively delays the aging process of the material, improving the long-term stability and service life of the material.

[0140] The presence of the thermosensitive coating material not only improves the printing effect but also enhances the overall thermal stability of the material, enabling the wristband to maintain good performance in various complex environments.

[0141] In summary: By adding polyether block amide, fatty alcohol polyoxyethylene ether, nano-silica, and modified nano-calcium carbonate, the flexibility and tensile strength of the material are significantly improved, and the wear resistance is enhanced; the synergistic effect of the antioxidant and ultraviolet absorber effectively delays the aging process of the material, enhances its stability in high-temperature and ultraviolet environments, and extends the service life of the wristband; the addition of silver ion antibacterial agent significantly improves the antibacterial ability of the wristband material, effectively inhibiting the growth of common pathogens such as Escherichia coli and Staphylococcus aureus, meeting the antibacterial requirements of medical grade; the application of the thermosensitive coating material not only improves the printing effect but also enhances the long-term readability of information, ensuring the accuracy and reliability of information.

[0142] It should be noted that the addition of nano-silica and modified nano-calcium carbonate not only enhances the mechanical strength and wear resistance of the wristband but also improves its waterproof performance, enabling the wristband to remain stable in a humid environment.

[0143] The thermosensitive coating material not only improves the printing clarity but also has a waterproof effect, protecting the printed information from liquid erosion.

[0144] Thermoplastic polyurethane and polyether block amide have strong chemical corrosion resistance, enabling the wristband to withstand multiple alcohol wipes without deterioration or damage.

[0145] The following points should be noted: First, in the description of the present invention, it should be noted that unless otherwise specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense, which can be a mechanical connection or an electrical connection, or the communication inside two components, and can be directly connected. The terms "upper", "lower", "left", "right", etc. are only used to represent the relative positional relationship. When the absolute position of the object being described changes, the relative positional relationship may change;

[0146] Second, in the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0147] Finally, the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0148] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A material for a thermal printing wristband, characterized in that: The invention comprises the following components by weight: 75-95 parts of thermoplastic polyurethane, 20-30 parts of polyether block amide, 5-10 parts of fatty alcohol polyoxyethylene ether, 5-10 parts of nano silicon dioxide, 3-5 parts of modified nano calcium carbonate, 1-5 parts of silane coupling agent, 5-10 parts of heat-sensitive coating material, 3-8 parts of plasticizer, 1-3 parts of silver ion antibacterial agent and 1-5 parts of compatibilizer.

2. The material for thermal printing wristband according to claim 1, characterized in that: The heat-sensitive coating material comprises 5-10 parts of crystal violet lactone, 10-20 parts of developer activator, 5-10 parts of polyvinyl alcohol, 1-3 parts of silicone oil, 0.5-2 parts of sulfonylurea compound, 5-10 parts of silicon oxide, 0.5-2 parts of antioxidant and 0.5-2 parts of ultraviolet absorber.

3. The material for a thermal printing wristband according to claim 2, characterized in that: The antioxidant consists of 60% by weight of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 30% by weight of n-octadecylβ-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 10% by weight of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite.

4. The material for a thermal printing wristband according to claim 2, characterized in that: The ultraviolet absorber is composed of 50% by weight of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 30% by weight of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, and 20% by weight of 2-hydroxy-4-n-octyloxybenzophenone.

5. The material for thermal printing wristband according to claim 2, characterized in that: The developer activator is any one or more combinations of bisphenol A, bisphenol S and phenolic resin.

6. The material for a thermal printing wristband according to claim 2, characterized in that: The sulfonylurea compound is any one or more combinations of benzenesulfonylurea, p-toluenesulfonylurea, phthalylsulfonimide, and 4,4'-bis(phenylsulfonylurea)diphenylsulfone.

7. The material for a thermal printing wristband according to claim 1, characterized in that: The plasticizer is any one of dioctyl phthalate and dioctyl adipate or a combination of the two.

8. The material for a thermal printing wristband according to claim 1, characterized in that: The compatibilizer is any one of maleic anhydride grafted styrene-ethylene / butylene-styrene block copolymer and maleic anhydride grafted polypropylene or a combination of two thereof.

9. A method for preparing a thermal printing wristband material, which is suitable for preparing the material for a thermal printing wristband according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, weighing the raw materials in parts by weight; S2, thermoplastic polyurethane and polyether block amide are added to a high-speed mixer, with a rotating speed of 800-1000rpm, mixing for 5-10min, fatty alcohol polyoxyethylene ether, nano silicon dioxide and modified nano calcium carbonate are added sequentially, after each component is added, the rotating speed is maintained at 800-1000rpm, mixing for 5min, silane coupling agent is added, the rotating speed is 600-800rpm, mixing for 5-10min, plasticizer, silver ion antibacterial agent and compatibilizer are added sequentially, the rotating speed is 800-1000rpm, mixing for 5-10min, and a basic mixture is obtained; S3, sequentially add crystal violet lactone, developer activator, polyvinyl alcohol, silicone oil, sulfonylurea compound, silicon oxide, antioxidant, and ultraviolet absorber into a high shear mixer, keep the speed at 1000-1500 rpm after each component is added, mix for 5 minutes, and then mix for 5-10 minutes after all components are added to obtain a heat-sensitive coating slurry; S4, melt-kneading the base mixture in S2 using a twin-screw extruder, with an extrusion temperature of 180-220° C. and a screw speed of 100-200 rpm, and cooling and shaping after extrusion to obtain a base material; S5, evenly coating the heat-sensitive coating slurry in S3 on the surface of the base material extruded in S4, Drying at a temperature of 80-120°C to obtain a thermal printing wristband material; S6, cutting and rolling up the thermal printing wristband material in S5.

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