A high-definition hot stamp ribbon for large-volume infusion bags

Abstract

The present application belongs to the technical field of preparation of hot stamping material, and particularly relates to a high-definition hot stamping ribbon for infusion bags, which comprises, in sequence, a substrate layer, a release layer, a color layer and a back adhesive layer, wherein the color layer is coated by color layer paint, and the color layer paint comprises the following raw materials in parts by weight: water-dispersed polyurethane 60-80 parts; acrylic resin 10-20 parts; vinyl acrylic acid 15-20 parts; modified nano-silica sol 5-8 parts; phenyltrichlorosilane 0.2-0.5 parts; sodium chloride 0.5-1 part; pigment 10-30 parts; leveling agent 0.5-2 parts; defoaming agent 0.1-0.5 parts. The hot stamping ribbon has a color layer with high strength and good high-temperature resistance, and can obtain high-definition hot stamping graphics after hot stamping.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hot stamping material preparation, and particularly relates to a high-definition hot stamping ribbon for large infusion bag. BACKGROUND

[0002] Large infusion is a common name of large volume injection, which usually refers to a liquid sterilized preparation with a capacity greater than or equal to 50 ml and directly input into the body by intravenous infusion. At present, the existing package materials in the infusion market in China mainly include four forms of glass bottles, plastic bottles, non-PVC soft bags and upright soft bags. Among them, the non-PVC soft bag is the most ideal infusion container, which has many advantages: (1) It has good safety, effectiveness, stability and environmental protection, which meets the requirements of environmental protection regulations in China. (2) It has good transparency, and it is easy to find foreign matter in the drug solution. (3) Whether it is empty bag or after filling the drug solution, it is convenient, safe and low in cost. (4) The drug solution is not secondarily polluted by air during infusion, and the promotion and use are easy to be accepted by people.

[0003] In order to meet the cleanliness requirements of drugs, the production of non-PVC large infusion soft bag must be completed in a hundred-level clean workshop, which makes the traditional printing method useless due to solvent volatilization and pollution of the workshop environment. Therefore, the identification of the bag body (including drug name, trademark, instruction manual, production date, shelf life and expiration date, etc.) is usually completed by hot stamping process.

[0004] The hot stamping process is to press the hot stamping ribbon on the hot stamping color layer by using the convex letter printing template, so that the ink on the hot stamping color layer is transferred to the surface of the bag body under the action of heat and pressure. The existing hot stamping color layer is not strong in high temperature resistance, and the color layer coating is easy to melt and flow under high temperature and pressure during hot stamping, resulting in poor clarity of the transferred image on the bag body surface, which directly affects the quality and appearance of the hot stamping product.

[0005] Therefore, it is one of the technical problems to be solved by those skilled in the art to provide a high-definition hot stamping ribbon for large infusion bag. SUMMARY

[0006] The purpose of the present application is to provide a high-definition hot stamping ribbon for large infusion bag to solve the above technical problems.

[0007] Therefore, the present application provides a high-definition hot stamping ribbon for large infusion bag, which comprises a substrate layer, a release layer, a color layer and an adhesive layer arranged in sequence, wherein the color layer is coated by color layer coating, and the color layer coating comprises the following raw materials by weight:

[0008]

[0009] Further, the preparation process of the water-dispersed polyurethane is as follows:

[0010] First, the polyether polyol and isocyanate are placed in an appropriate amount of organic solvent, and reacted at 90-110℃ for 1-2h to obtain an isocyanate-based polyurethane prepolymer;

[0011] Then, the chain extender is added, and stirred and reacted at 90-110℃ for 1-2h to obtain a polyurethane material;

[0012] Then, triethylamine is added, and stirred and reacted at 60-70℃ for 20-30min, then an ethylenediamine aqueous solution is added, stirred and dispersed for 30-40min to obtain a water-dispersed polyurethane.

[0013] Further, the chain extender is one or more of dimethylol propanoic acid and dimethylol butanoic acid, and the addition amount of the chain extender is 1%-2% of the weight of the isocyanate-based polyurethane prepolymer.

[0014] Further, the addition amount of the triethylamine is 0.3%-0.5% of the weight of the isocyanate-based polyurethane prepolymer.

[0015] Further, the concentration of the ethylenediamine aqueous solution is 15-25%, and the addition amount of the ethylenediamine aqueous solution is 5%-10% of the weight of the isocyanate-based polyurethane prepolymer.

[0016] Further, the acrylic resin is one or more of polymethyl methacrylate, polymethyl methacrylate, polyethyl acrylate, and methyl acrylate-ethyl acrylate copolymer.

[0017] Further, the preparation process of the modified nanosilica sol is as follows:

[0018] First, 30-50 parts by weight of ethanol, 3-5 parts by weight of deionized water, 3-5 parts by weight of ammonia water, and 5-10 parts by weight of a silane coupling agent are added to a reactor, then the reaction system is heated to 80-100℃ under stirring, then 10-20 parts by weight of tetraethyl orthosilicate is slowly added, the tetraethyl orthosilicate is added within 40-80min, then the stirring reaction is continued for 3-5h; after the reaction is completed, 0.5-3 parts of a surfactant is added and stirred uniformly to obtain a modified nanosilica sol.

[0019] Further, the silane coupling agent used for preparing the modified nanosilica sol is a vinyl silane coupling agent.

[0020] Further, the preparation process of the color layer paint includes the following steps:

[0021] S1, take the formula amount of acrylic resin and modified nanometer silica sol, mix, then heat the mixed system to 50-70 DEG C under stirring, keep warm for 1-2h, then filter to obtain modified acrylic resin;

[0022] S2, take the formula amount of 60-80% of vinyl acrylic acid, and 0.5-1 parts of acrylamide, 0.05-0.1 parts of surfactant, 0.01-0.05 parts of initiator and 0.01-0.05 parts of chain extender into a proper amount of deionized water, then heat the reaction system to 50-60 DEG C under nitrogen atmosphere, stir for 2-5h to obtain polyacrylic acid prepolymer, then add 0.2-0.5 parts of phenyltrichlorosilane, stir for 1-2h at 70-90 DEG C to obtain water-based polyvinyl acrylic acid, ready for use;

[0023] S3, take the formula amount of 20-40% of vinyl acrylic acid and the modified acrylic resin obtained in step S1, add it into 30-50 parts by weight of organic solvent, stir at 800-2000 rpm for 1-2h at room temperature, then add 0.1-0.2 parts of azobisisobutyronitrile, heat the mixed system to 90-100 DEG C, stir for 2-3h at 200-500 rpm, then evaporate the organic solvent to obtain the mixed system, cool to room temperature, ready for use;

[0024] S4, mix the formula amount of water-dispersed polyurethane, the water-based polyvinyl acrylic acid obtained in step S2 and the mixed system obtained in step S3, and the formula amount of sodium chloride, pigment, leveling agent and defoaming agent, stir uniformly to obtain the color layer coating.

[0025] Further, the dry coating amount of the color layer coating is 3-6g / m 2 .

[0026] The beneficial effects of the present application are: in the color layer coating described in the present application, the acrylic resin is modified by the modified nanometer silica sol in step S1, which can make the modified acrylic resin have good hydrophilicity and can be uniformly dispersed in the color layer coating; the vinyl acrylic acid is treated in step S2, which can obtain water-based polyvinyl acrylic acid with good high temperature resistance and adhesion, and the treatment of phenyltrichlorosilane can make the water-based polyvinyl acrylic acid contain a large number of siloxane bonds in the molecular structure, which has high bond energy and good thermal stability, and can further improve the high temperature resistance of the color layer coating; the treatment of the remaining vinyl acrylic acid and the modified acrylic resin in step S3 can obtain a mixed system with good penetration and heat resistance, and the use of the above-mentioned substances in the preparation of color layer coating can obtain a color layer with high strength and good high temperature resistance, and finally obtain high-definition thermoprinted text. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of the hot stamping ribbon according to the present application.

[0028] The figure mark indicates that:

[0029] 1 - substrate layer, 2 - release layer; 3, color layer; 4, back adhesive layer. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0031] In the description of the present application, it should be noted that the terms used herein are only intended to describe the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship. The techniques, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0032] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not intended to describe a specific order or sequence. It should be understood that the data used in this way can be exchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second" and the like are generally a class, and do not limit the number of objects, for example, the first object can be one or more. In addition, the specification and claims "and / or" indicate at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are a "or" relationship.

[0033] It should be noted that in the description of the present application, the terms of orientation such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation terms do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; the orientation terms "inner, outer" refer to the inner and outer of the contour of each component itself.

[0034] It should be noted that in the present application, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitation, the element defined by the sentence "including a…" does not exclude the presence of another identical element in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from the described order, and various steps can also be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0035] A high-definition stamping color tape for large infusion bag, the stamping color tape comprising, in sequence, a substrate layer 1, a release layer 2, a color layer 3 and a back adhesive layer 4, wherein the color layer 3 is coated by a color layer coating, the color layer coating comprising the following raw materials by weight:

[0036]

[0037]

[0038] Further, the preparation process of the water-dispersible polyurethane is as follows:

[0039] First, the polyether polyol and isocyanate are placed in an appropriate amount of organic solvent, and reacted at 90-110℃ for 1-2h to obtain an isocyanate-based polyurethane prepolymer;

[0040] Then, a chain extender is added, and stirred and reacted at 90-110℃ for 1-2h to obtain a polyurethane material;

[0041] Then add triethylamine, and stir at 60-70℃ for 20-30min, then add ethylenediamine aqueous solution, stir and disperse for 30-40min to obtain water-dispersed polyurethane.

[0042] Preferably, the polyether polyol is a dry polyether polyol after vacuum dehydration treatment.

[0043] As some embodiments of the present application, the organic solvent used in the process of preparing the water-dispersed polyurethane can be one or more of ethanol, acetone, and butanone.

[0044] Preferably, the molar ratio of the isocyanate and the polyether polyol is (2-2.3):1.

[0045] Preferably, the chain extender is one or more of dimethylol propanoic acid and dimethylol butanoic acid.

[0046] Preferably, the amount of the chain extender added is 1-2% of the weight of the isocyanate-based polyurethane prepolymer.

[0047] Preferably, the amount of the triethylamine added is 0.3-0.5% of the weight of the isocyanate-based polyurethane prepolymer.

[0048] Preferably, the concentration of the ethylenediamine aqueous solution is 15-25%.

[0049] Preferably, the amount of the ethylenediamine aqueous solution added is 5-10% of the weight of the isocyanate-based polyurethane prepolymer.

[0050] As some embodiments of the present application, the acrylic resin can be one or more of polymethyl methacrylate, polymethyl methacrylate, polyethyl acrylate, and methyl acrylate-ethyl acrylate copolymer.

[0051] Preferably, the particle size of the acrylic resin is ≤100um.

[0052] Further, the preparation process of the modified nanosilica sol is as follows:

[0053] First, 30-50 parts by weight of ethanol, 3-5 parts by weight of deionized water, 3-5 parts by weight of ammonia water, and 5-10 parts by weight of a silane coupling agent are added to a reactor, then the reaction system is heated to 80-100℃ under stirring, then 10-20 parts by weight of tetraethyl orthosilicate is slowly added, the tetraethyl orthosilicate is added within 40-80min, then the stirring reaction is continued for 3-5h; after the reaction is completed, 0.5-3 parts of a surfactant is added and stirred uniformly to obtain the modified nanosilica sol, which is ready for use.

[0054] Preferably, the silane coupling agent used in the preparation of the modified nanosilica sol is a vinyl silane coupling agent.

[0055] As some embodiments of the present application, the surfactant used in the preparation of the modified nanosilica sol is one or more of FS-10, FS-3100, sodium dodecyl sulfate, Tween 60 or Tween 70.

[0056] Further, the preparation process of the color coating includes the following steps:

[0057] S1, take the formula amount of acrylic resin and modified nanosilica sol, mix, then heat the mixed system to 50-70℃ under stirring, keep warm for 1-2h, then filter to obtain modified acrylic resin;

[0058] S2, take the formula amount of 60-80% of vinyl acrylic acid, 0.5-1 parts of acrylamide, 0.05-0.1 parts of surfactant, 0.01-0.05 parts of initiator and 0.01-0.05 parts of chain extender into a proper amount of deionized water, then heat the reaction system to 50-60℃ under nitrogen atmosphere, stir for 2-5h to obtain polyacrylic acid prepolymer; then add 0.2-0.5 parts of phenyltrichlorosilane, stir at 70-90℃ for 1-2h to obtain water-based polyvinyl acrylic acid, ready for use;

[0059] S3, take the formula amount of 20-40% of vinyl acrylic acid and the modified acrylic resin obtained in step S1, add it into 30-50 parts by weight of organic solvent, stir at room temperature at a speed of 800-2000rpm for 1-2h, then add 0.1-0.2 parts of azobisisobutyronitrile, heat the mixed system to 90-100℃, stir at a speed of 200-500rpm for 2-3h, then evaporate the organic solvent to obtain the mixed system, cool it to room temperature, ready for use;

[0060] S4, mix the formula amount of water-dispersed polyurethane, the water-based polyvinyl acrylic acid obtained in step S2 and the mixed system obtained in step S3, as well as the formula amount of sodium chloride, pigment, leveling agent and defoaming agent, stir uniformly to obtain the color coating.

[0061] As some embodiments of the present application, the surfactant used in step S2 can be one or more of CO-60, lauryl alcohol polyoxyethylene ether, fatty amine polyoxyethylene ether.

[0062] As some embodiments of the present application, the initiator used in step S2 can be one or more of ammonium persulfate, potassium persulfate, sodium persulfate.

[0063] As some embodiments of the present application, the chain extender used in the step S2 can be one or more of ethylenediamine, sorbitol, 1,4-butanediol.

[0064] As some embodiments of the present application, the organic solvent used in the step S3 is alicyclic hydrocarbon or ketone organic solvent, such as cyclohexane, kerosene, etc.

[0065] Preferably, the dry coating amount of the color layer paint is 3-6 g / m 2 .

[0066] As some embodiments of the present application, the preparation of the substrate layer 1, the release layer 2 and the adhesive layer 4 can refer to the Chinese patent with the publication (announcement) number CN108864978B of the applicant's earlier application, which will not be repeated here.

[0067] In the color layer paint described in the present application, the modified nanosilica sol is used in step S1 to modify the acrylic resin, which can make the modified acrylic resin have good hydrophilicity and be uniformly dispersed in the color layer paint; the vinyl acrylic acid is treated in step S2, which can obtain water-based polyvinyl acrylic acid with good high-temperature resistance and adhesion. At the same time, through the treatment of phenyltrichlorosilane, the water-based polyvinyl acrylic acid contains a large number of siloxane bonds in its molecular structure, which has high bond energy and good thermal stability, and can further improve the high-temperature resistance of the color layer paint; the remaining vinyl acrylic acid and the modified acrylic resin are treated in step S3 to obtain a mixed system with good penetration ability and good heat resistance. The above-mentioned substances are used to prepare the color layer paint, which can obtain a color layer with high strength and good high-temperature resistance, and finally obtain high-definition hot stamping graphics.

[0068] The above-described high-definition hot stamping color band for infusion bags and its preparation are illustrated by specific embodiments as follows:

[0069] Example 1

[0070] First, the color layer paint is prepared, which includes the following raw materials by weight:

[0071]

[0072] The preparation process of the color layer paint is as follows:

[0073] S1, take the formula amount of acrylic resin and modified nanosilica sol, mix, then heat the mixed system to 50℃ under stirring, keep for 2h, then filter to obtain modified acrylic resin;

[0074] S2, take the formula amount of 60% of the vinyl acrylic acid, and 0.5 parts of acrylamide, 0.05 parts of surfactant, 0.01 parts of initiator and 0.01 parts of chain extender into a certain amount of deionized water, then heat the reaction system to 50℃ under nitrogen atmosphere, stir for 2h, then get the polyacrylic acid prepolymer; then add 0.2 parts of phenyltrichlorosilane, stir at 70℃ for 1h, get the water-based polyvinyl acrylic acid, ready for use;

[0075] S3, take the formula amount of 40% of the vinyl acrylic acid and the modified acrylic resin obtained in step S1, add it into 50 parts by weight of organic solvent, stir at room temperature for 1h at 2000r / min, then add 0.2 parts of azobisisobutyronitrile, heat the mixed system to 100℃, stir for 2h at 500r / min, then evaporate the organic solvent, cool the obtained mixed system to room temperature, ready for use;

[0076] S4, mix the formula amount of water-dispersed polyurethane, the water-based polyvinyl acrylic acid obtained in step S2 and the mixed system obtained in step S3, and the formula amount of sodium chloride, pigment, leveling agent and defoaming agent, stir uniformly, then get the color layer coating.

[0077] Then prepare the hot stamping color band for large infusion bag, which includes substrate layer, release layer, color layer and back adhesive layer arranged in sequence; refer to the Chinese patent with publication (announcement) number CN108864978B of the applicant's earlier application, select biaxially oriented polyester film as the substrate layer material; the release agent prepared by mixing and stirring the main agent and diluent uniformly is used as the release layer raw material; the color layer coating described above is used as the color layer raw material; the back adhesive layer raw material is prepared by dissolving the heat-sensitive resin in organic solvent and adding silica powder for high-speed dispersion. Then coat the release layer, color layer and back adhesive layer on the surface of the substrate layer in sequence by gravure anilox roll, wherein the coating dry weight of the release agent is controlled between 0.025-0.1g / m 2 , the coating dry weight of the color layer coating is controlled between 3-6g / m 2 , and the coating dry weight of the back adhesive layer is controlled between 0.5-1g / m 2 .

[0078] Hot stamping effect detection, the prepared hot stamping color band is hot stamped on the non-PVC large infusion soft bag, to get the printed graphics with clear font, high color reproduction degree and high color density, compared with the hot stamping color band of example 4 in the patent with publication (announcement) number CN108864978B, the clarity is improved by 23%.

[0079] Example 2

[0080] First, prepare the color layer coating, which includes the following raw materials in parts by weight:

[0081]

[0082] The preparation process of the color layer paint is as follows:

[0083] S1, take the formula amount of acrylic resin and modified nano silica sol, mix, then heat the mixed system to 60℃ under stirring, keep for 1.6h, then filter to obtain modified acrylic resin;

[0084] S2, take the formula amount of 70% vinyl acrylic acid, 1 part of acrylamide, 0.1 part of surfactant, 0.05 part of initiator and 0.05 part of chain extender, add into appropriate amount of deionized water, then heat the reaction system to 60℃ under nitrogen atmosphere, stir for 5h to obtain polyacrylic acid prepolymer; then add 0.5 parts of phenyltrichlorosilane, stir at 90℃ for 2h to obtain water-based polyvinyl acrylic acid, ready for use;

[0085] S3, take the formula amount of 30% vinyl acrylic acid and the modified acrylic resin obtained in step S1, add into 40 parts by weight of organic solvent, stir at room temperature at 1000r / min for 1.5h, then add 0.15 parts of azobisisobutyronitrile, heat the mixed system to 95℃, stir at 300r / min for 2.5h, then evaporate the organic solvent to obtain the mixed system, cool to room temperature, ready for use;

[0086] S4, mix the formula amount of water-dispersed polyurethane, the water-based polyvinyl acrylic acid obtained in step S2 and the mixed system obtained in step S3, and the formula amount of sodium chloride, pigment, leveling agent and defoaming agent, stir uniformly to obtain the color layer paint.

[0087] Then prepare the hot stamping color band for large infusion bag, which comprises substrate layer, release layer, color layer and back adhesive layer arranged in sequence; refer to the Chinese patent with publication (announcement) number CN108864978B of the applicant's earlier application, select biaxially oriented polyester film as the substrate layer material; the release agent prepared by mixing and stirring the main agent and diluent uniformly is used as the release layer raw material; the color layer paint described above is used as the color layer raw material; the back adhesive layer raw material is prepared by dissolving the heat-sensitive resin in organic solvent and adding silica powder for high-speed dispersion. Then the release layer, color layer and back adhesive layer are coated on the surface of the substrate layer in sequence by gravure anilox roll, wherein the coating dry weight of the release agent is controlled at 0.025-0.1g / m 2 , the coating dry weight of the color layer paint is controlled at 3-6g / m 2 , and the coating dry weight of the back adhesive layer is controlled at 0.5-1g / m 2 .

[0088] The prepared hot stamping color band is hot stamped on a non-PVC large infusion soft bag to obtain printed graphics with clear font, high color restoration degree and high color density. Compared with the hot stamping color band of Example 4 in CN108864978B, the clarity is increased by 26%.

[0089] Example 3

[0090] First, the color layer paint is prepared, which includes the following raw materials by weight:

[0091]

[0092]

[0093] The preparation process of the color layer paint is as follows:

[0094] S1, take the formula amount of acrylic resin and modified nano silica sol, mix, then heat the mixed system to 70℃ under stirring, after 1h, filter, get modified acrylic resin;

[0095] S2, take 80% of the formula amount of vinyl acrylic acid, 0.8 parts of acrylamide, 0.08 parts of surfactant, 0.03 parts of initiator and 0.03 parts of chain extender into appropriate amount of deionized water, then heat the reaction system to 52℃ under nitrogen atmosphere, after stirring for 3h, get polyacrylic acid prepolymer; then add 0.4 parts of phenyltrichlorosilane, stir at 85℃ for 1h, get water-based polyvinyl acrylic acid, ready for use;

[0096] S3, take 20% of the formula amount of vinyl acrylic acid and the modified acrylic resin obtained in step S1, add it into 30 parts by weight of organic solvent, stir at 800r / min at room temperature for 2h, then add 0.1 parts of azobisisobutyronitrile, heat the mixed system to 90℃, stir at 200r / min for 3h, then evaporate the organic solvent, cool the obtained mixed system to room temperature, ready for use;

[0097] S4, mix the formula amount of water-dispersed polyurethane, water-based polyvinyl acrylic acid obtained in step S2 and the mixed system obtained in step S3, and the formula amount of sodium chloride, pigment, leveling agent and defoaming agent, stir uniformly, then get the color layer paint.

[0098] Then the hot stamping ribbon for large infusion bag is prepared, the hot stamping ribbon comprises, in sequence, a substrate layer, a release layer, a color layer and an adhesive layer; referring to the Chinese patent with the publication (announcement) number CN108864978B of the applicant's earlier application, a biaxially oriented polyester film is selected as the substrate layer material; the release agent prepared by uniformly mixing and stirring the main agent and the diluent is used as the release layer raw material; the color layer coating described above is used as the color layer raw material; the adhesive layer raw material is prepared by dissolving the heat-sensitive resin in an organic solvent and adding silica powder for high-speed dispersion. Then the release layer, the color layer and the adhesive layer are coated on the surface of the substrate layer in sequence by a gravure anilox roller, wherein the dry coating amount of the release agent is controlled to be between 0.025-0.1 g / m 2 , the dry coating amount of the color layer coating is controlled to be between 3-6 g / m 2 , and the dry coating amount of the adhesive layer is controlled to be between 0.5-1 g / m 2 .

[0099] The hot stamping effect is detected, the prepared hot stamping ribbon is hot stamped on the non-PVC large infusion soft bag, and the printed graphics with clear font, high color restoration degree and high color density are obtained. Compared with the hot stamping ribbon of Example 4 in the patent with the publication (announcement) number CN108864978B, the clarity is improved by 22%.

[0100] Example 4

[0101] First, the color layer coating is prepared, which comprises the following raw materials by weight:

[0102]

[0103] The preparation process of the color layer coating is as follows:

[0104] S1, the formula amount of acrylic resin and modified nano-silica sol are taken and mixed, then the mixed system is heated to 65℃ under stirring, and after 1.6h of insulation, it is filtered to obtain modified acrylic resin;

[0105] S2, 70% of the formula amount of vinyl acrylic acid, 0.5 parts of acrylamide, 0.05 parts of surfactant, 0.01 parts of initiator and 0.01 parts of chain extender are added into a proper amount of deionized water, then the reaction system is heated to 50℃ under nitrogen atmosphere, and after 5h of stirring reaction, polyacrylic acid prepolymer is obtained; then 0.2 parts of phenyltrichlorosilane is added, and the stirring reaction is carried out at 70℃ for 1.5h to obtain water-based polyvinyl acrylic acid, which is ready for use;

[0106] S3, taking the formula amount of 30% of the vinyl acrylic acid and the modified acrylic acid resin obtained in step S1, adding it into 45 parts by weight of the organic solvent, stirring at 1500 rpm for 1 h at room temperature, adding 0.1 part of azobisisobutyronitrile, heating the mixed system to 98°C, stirring at 400 rpm for 3 h, evaporating the organic solvent, and then cooling the obtained mixed system to room temperature for standby;

[0107] S4, mixing the formula amount of the water-dispersed polyurethane, the water-based polyvinyl acrylic acid obtained in step S2, and the mixed system obtained in step S3, and the formula amount of sodium chloride, pigment, leveling agent and defoaming agent, stirring uniformly, and then obtaining the color layer coating.

[0108] Then, the hot stamping color band for large infusion bag is prepared, the hot stamping color band comprises a substrate layer, a release layer, a color layer and an adhesive layer arranged in sequence; referring to the Chinese patent with the publication (announcement) number CN108864978B of the applicant's earlier application, the biaxially oriented polyester film is selected as the substrate layer material; the release agent prepared by mixing and stirring the main agent and the diluent uniformly is used as the release layer raw material; the color layer coating described above is used as the color layer raw material; the adhesive layer raw material is prepared by dissolving the heat-sensitive resin in the organic solvent and adding the silica powder for high-speed dispersion. Then, the release layer, the color layer and the adhesive layer are coated on the surface of the substrate layer in sequence by the gravure anilox roller, wherein the coating dry weight of the release agent is controlled between 0.025-0.1 g / m 2 , the coating dry weight of the color layer coating is controlled between 3-6 g / m 2 , and the coating dry weight of the adhesive layer is controlled between 0.5-1 g / m 2 .

[0109] The hot stamping effect detection is carried out, the prepared hot stamping color band is hot stamped on the non-PVC large infusion soft bag, and the printed graphics with clear font, high color restoration degree and high color density are obtained. Compared with the hot stamping color band of example 4 in the patent with the publication (announcement) number CN108864978B, the clarity is improved by 27%.

[0110] The embodiments of the present application are described above in combination with the drawings, the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, the present application is not limited to the above-mentioned specific embodiments, the above-mentioned specific embodiments are only illustrative, but not limited, the ordinary skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the protection scope of the claims, which all belong to the protection scope of the present application.

Claims

1. A high-definition hot stamping ribbon for large infusion bags, the hot stamping ribbon comprising, in sequence: a substrate layer, a release layer, a color layer, and an adhesive layer, wherein, The color layer is formed by applying a color coating, characterized in that the color coating comprises the following raw materials in parts by weight: 60-80 parts of water-dispersible polyurethane; 10-20 parts acrylic resin; 15-20 parts vinyl acrylic; 5-8 parts of modified nano-silica sol; 0.2-0.5 parts of phenyltrichlorosilane; Sodium chloride 0.5~1 part; 10-30 parts pigment; Leveling agent 0.5~2 parts; Defoamer 0.1~0.5 parts; Wherein, the particle size of the acrylic resin is ≤100μm; The preparation process of the modified nano-silica sol is as follows: First, 30-50 parts by weight of ethanol, 3-5 parts by weight of deionized water, 3-5 parts by weight of ammonia, and 5-10 parts by weight of silane coupling agent are added to the reactor. Then, the reaction system is heated to 80-100°C with stirring. Next, 10-20 parts by weight of tetraethyl orthosilicate are slowly added over 40-80 minutes. The reaction is then continued with stirring for 3-5 hours. After the reaction is complete, 0.5-3 parts of surfactant are added and stirred until homogeneous to obtain modified nano-silica sol. The silane coupling agent is a vinyl silane coupling agent. The preparation process of the color coating includes the following steps: S1, take the prescribed amount of acrylic resin and modified nano silica sol, mix them, then heat the mixture to 50~70℃ under stirring, keep it at the temperature for 1~2 hours, filter it, and obtain the modified acrylic resin; S2, take 60-80% of the formulated amount of vinyl acrylic acid, 0.5-1 part of acrylamide, 0.05-0.1 part of surfactant, 0.01-0.05 part of initiator and 0.01-0.05 part of chain extender and add them to an appropriate amount of deionized water. Then, under a nitrogen atmosphere, heat the reaction system to 50-60°C and stir for 2-5 hours to obtain polyacrylic acid prepolymer. Then add 0.2-0.5 parts of phenyltrichlorosilane and stir for 1-2 hours at 70-90°C to obtain waterborne polyvinyl acrylic acid for later use. S3, take 20-40% of the formulated amount of vinyl acrylic acid and the modified acrylic resin obtained in step S1, add them to 30-50 parts by weight of organic solvent, stir at 800-2000 rpm for 1-2 hours at room temperature, add 0.1-0.2 parts of azobisisobutyronitrile, heat the mixture to 90-100℃, stir at 200-500 rpm for 2-3 hours, evaporate the organic solvent, and cool the resulting mixture to room temperature for later use; S4. Mix the formulated amount of water-dispersible polyurethane, the water-based polyvinyl acrylic acid obtained in step S2, and the mixed system obtained in step S3, as well as the formulated amounts of sodium chloride, pigment, leveling agent, and defoamer. After stirring evenly, the color coating is obtained.

2. The hot stamping ribbon for large infusion bags according to claim 1, characterized in that, The preparation process of the water-dispersible polyurethane is as follows: First, polyether polyol and isocyanate are placed in an appropriate amount of organic solvent and reacted at 90~110℃ for 1~2h to obtain isocyanate-based polyurethane prepolymer; Then, a chain extender is added, and the mixture is stirred and reacted at 90~110℃ for 1~2 hours to obtain a polyurethane material. Then triethylamine is added, and the mixture is stirred and reacted at 60-70°C for 20-30 minutes. Then ethylenediamine aqueous solution is added, and the mixture is stirred and dispersed for 30-40 minutes to obtain water-dispersed polyurethane.

3. The hot stamping ribbon for large infusion bags according to claim 2, characterized in that, The chain extender is one or more of dimethylolpropionic acid and dimethylolbutyric acid, and the amount of the chain extender added is 1% to 2% of the weight of the isocyanate-based polyurethane prepolymer.

4. The hot stamping ribbon for large infusion bags according to claim 2, characterized in that, The amount of triethylamine added is 0.3% to 0.5% of the weight of the isocyanate-based polyurethane prepolymer.

5. The hot stamping ribbon for large infusion bags according to claim 2, characterized in that, The concentration of the ethylenediamine aqueous solution is 15-25%, and the amount of ethylenediamine aqueous solution added is 5%-10% of the weight of the isocyanate-based polyurethane prepolymer.

6. The hot stamping ribbon for large infusion bags according to claim 1, characterized in that, The acrylic resin is one or more of polymethacrylate, polymethyl methacrylate, polyethyl acrylate, and methyl acrylate-ethyl acrylate copolymer.

7. The hot stamping ribbon for large infusion bags according to claim 1, characterized in that, The dry weight of the color coating is 3~6 g / m². 2 .

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