A retroreflective sheeting printed with a ribbon having a base material

Abstract

The present application provides a kind of band base material carbon tape printing retroreflective sheet, the band base material carbon tape printing retroreflective sheet includes retroreflective structure layer, mirror surface reflection layer and substrate layer;Wherein, the mirror surface reflection layer is connected with substrate layer by adhesive layer, and, the breaking strength of adhesive layer is 1.7N / mm 2 Below, the elongation is above 220mm, and the peeling force at 90 ° angle is above 10N / 25mm;The substrate layer is selected from the laminated film of single-layer or multi-layer resin film, and the thickness of the substrate layer is 188-1000 μm.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of retroreflective articles, and particularly relates to a retroreflective sheet with a base material and capable of being printed by a carbon ribbon. BACKGROUND

[0002] Retroreflective articles, such as retroreflective sheets (retroreflective films), are characterized by their ability to redirect light to its original source. Retroreflective articles have found use in a variety of applications, such as safety vests, traffic signs, authentication labels, license plates, and security documents.

[0003] The existing retroreflective film generally has a glue layer and a release paper (or a release PET, a CPP, etc.), and the manufacturer needs to perform a lamination process when preparing the retroreflective film, thereby increasing the production cost. Meanwhile, after the user purchases the retroreflective film, the user generally needs to peel off the release paper and then stick the retroreflective film to a plastic, metal, or other base material. Moreover, due to the different base materials to which the retroreflective film is laminated, the retroreflective film may be curled, cracked, or bulged after use. For example, the existing commercially available license plate is curled, cracked, or bulged after use due to the different plastic materials applied, and the volatilization of plasticizers in the plastic material affects the performance of the glue layer, thereby causing the retroreflective film to be separated or bulged.

[0004] In addition, the surface of the retroreflective film generally needs to be printed with information such as characters and signs by a carbon ribbon printer. Since the general carbon ribbon printer is suitable for paper license plates, adhesives, and other relatively thin or soft materials, the printing cannot be performed on the carbon ribbon printer after the retroreflective film is laminated to a base material. For example, if the retroreflective film is laminated to a metal material, the metal material is too hard to be printed on the carbon ribbon printer, and seriously affects the service life of the print head of the carbon ribbon printer. For another example, the retroreflective film is laminated to a plastic plate, and the stiffness of the plastic plate can meet certain requirements and the plastic plate is softer than the metal material, which is beneficial to the carbon ribbon printing. However, due to the technology and structure of the existing carbon ribbon printer, not all plastic plates are suitable for carbon ribbon printing, and some plastic plates cannot be printed or directly damage the print head of the printer, or significantly reduce the service life of the print head.

[0005] The reference document 1 provides a new type of temporary license plate for motor vehicles, which is not easy to break and easy to identify, and includes a bearing base layer and a composite layer. The composite layer includes a printing layer, a retroreflective layer, and an adhesive layer arranged in sequence, and the composite layer is arranged on the side of the adhesive layer of the bearing base layer. The document discloses that the thickness of the bearing base layer is 0.3 mm to 1.0 mm, and the material of the bearing base layer is selected from polycarbonate PC, or PET, or PVC, or PP, or PETG, or ABS, or stone paper, or acrylic. In addition, it is disclosed that the surface roughness of the contact surface of the bearing base layer adjacent to the side of the adhesive layer is set to Ra≤3 μm. Moreover, it is mentioned that the carbon ribbon printing can be performed.

[0006] CITATIONS

[0007] CITATION 1: CN112248945A SUMMARY

[0008] Problem to be solved by the invention

[0009] Although the prior art has made some research on printable retroreflective film. But the inventors have also found the following problems in long-term practice: although citation 1 proposes a printable retroreflective film with a bearing base layer, on the one hand, although it has carbon tape printability, the overall structure of the composite layer is relatively simple; on the other hand, although it reduces the surface roughness of the adhesive surface of the bearing base layer in order to improve the adhesion of the bearing base layer and the adhesive layer, but this also leads to the need for special surface processing of the bearing substrate, in addition, too low roughness also leads to unnecessary slip in the lamination process, and the edge is prone to overflow and alignment problems. More importantly, even if the surface roughness problem is met, but over time, it is found that with the accumulation of exposure to outdoor (light, aging, etc.) time, there is still a problem of adhesive layer failure.

[0010] Therefore, based on the practice of the prior art, the present application provides a carbon tape printable retroreflective sheet with a substrate, which can be used as, for example, a battery bicycle license plate, a temporary license plate, etc., and the user can perform carbon tape printing by himself, reducing the process and saving costs. And solve the problem that when the retroreflective sheet is pasted on the substrate, it cannot be printed or affects the printing life (such as broken needle problems) when printing on relatively hard plastic plates or metal plates. The carbon tape printable retroreflective sheet with a substrate provided by the present application can normally perform carbon tape printing and does not affect the printing life, and can also solve the problem of existing retroreflective sheets due to substrate problems. At the same time, the retroreflective sheet of the present application can be provided to customers in the form of a roll with a substrate, and customers can cut the size according to their own needs. It can also be provided to customers in the form of a roll with a substrate according to customer needs.

[0011] Solution to solve the problem

[0012] Through the inventors' long-term research, it is found that the following technical solutions can solve the above technical problems:

[0013] [1]. The present application provides a carbon tape printable retroreflective sheet with a substrate, wherein the carbon tape printable retroreflective sheet with a substrate comprises, from top to bottom, a retroreflective structure layer, a mirror surface reflection layer and a substrate layer; wherein,

[0014] The mirror surface reflection layer and the substrate layer are connected by an adhesive layer, and the breaking strength of the adhesive layer is 1.7N / mm 2The elongation is above 220 mm; the peeling force at 90° angle is above 10 N / 25 mm; the substrate layer is selected from a single layer or a laminated film of multiple resin films,

[0015] The thickness of the substrate layer is 188-1000 μm.

[0016] [2]. The retroreflective sheet with a substrate and carbonable printing according to [1], wherein the retroreflective structure layer is a glass microbead type retroreflective structure layer or a microprism type retroreflective structure layer.

[0017] [3]. The retroreflective sheet with a substrate and carbonable printing according to [1] or [2], wherein the retroreflective structure layer is a glass microbead type retroreflective structure layer, comprising a support layer, glass microbeads and a focusing layer.

[0018] [4]. The retroreflective sheet with a substrate and carbonable printing according to [3], wherein the uppermost layer of the retroreflective structure layer further comprises a protective layer.

[0019] [5]. The retroreflective sheet with a substrate and carbonable printing according to [4], wherein a printing layer is further arranged between the protective layer and the support layer.

[0020] [6]. The retroreflective sheet with a substrate and carbonable printing according to any one of [1]-[5], wherein the substrate layer is provided with one, two, three or four resin film layers, and the film layers are of the same or different materials, and the multiple resin film layers are bonded by an adhesive component.

[0021] [7]. The retroreflective sheet with a substrate and carbonable printing according to any one of [1]-[6], wherein the thickness of the adhesive layer is 10-160 μm.

[0022] [8]. The retroreflective sheet with a substrate and carbonable printing according to any one of [1]-[7], wherein the material of the substrate layer is selected from polyethylene terephthalate or polycarbonate.

[0023] [9]. The retroreflective sheet with a substrate and carbonable printing according to any one of [1]-[8], wherein the retroreflective sheet is directly printed on a carbonable printer without film pasting.

[0024] Effects of the invention

[0025] Through the implementation of the above technical solution, the retroreflective sheet with a substrate and carbonable printing provided by the present application has the following technical effects:

[0026] 1) The problem of too thick and too hard substrate that cannot be carbonable printed is solved, and the printing effect and damage to the print head can be improved.

[0027] 2) In the substrate directly made on the retroreflective sheet, the user saves the bonding process, the operation is simple, at the same time, the manufacturer saves the bonding process, saves the production cost, can replace the process in the existing process, after the preparation of the retroreflective sheet, pasted on the aluminum plate or other substrate, and directly cut, punched, punch and other processes, directly into the sign or simple license plate and other products;

[0028] 3) At present, the products with a thickness of more than 188μm of PET or PC board on the market are limited, and the price is expensive, and the two to four times coating structure can well solve the above problems, improve the production capacity, save the cost, and also solve the problem that the current reflective material processing equipment cannot be coated due to the thickness of the substrate being too thick. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Structure diagram of the retroreflective sheet with a substrate and carbon ribbon printing according to the embodiment of the present application.

[0030] Explanation of reference signs:

[0031] 1 retroreflective structure layer;

[0032] 2 substrate layer;

[0033] 3 adhesive layer;

[0034] 4 mirror reflection layer;

[0035] 101 protective layer; 102 supporting layer; 103 glass microbeads; 104 focusing layer; 105 printing layer;

[0036] 201 resin film. DETAILED DESCRIPTION

[0037] The specific embodiments of the present application will be further described below in combination with the drawings and technical solutions. The description of the technical features described below is based on the representative embodiments, specific examples of the present application, but the present application is not limited to these embodiments, specific examples. It should be noted that:

[0038] In this specification, the numerical range represented by "numerical value A ~ numerical value B" means a range including the end point values A and B.

[0039] In this specification, the numerical range represented by "above" or "below" means a numerical range including the number.

[0040] In this specification, the meaning represented by "may" includes both the meaning of performing a certain process and the meaning of not performing a certain process.

[0041] In this specification, use of "or" means "and / or" unless clearly indicated otherwise or dictated by context. In this specification, use of "optionally" or "optional" means that certain elements, components, steps, conditions, etc. are present or omitted as desired.

[0042] In this specification, references to "some embodiments," "other embodiments," "exemplary embodiments," etc. indicate that the described feature is included in at least one embodiment of the present application, and can or can not be present in other embodiments. In addition, the description is not intended to limit the scope of the application to one or more embodiments described and / or illustrated herein. Further, it is understood that the examples and embodiments described herein are illustrative only and are not intended to limit the scope of the application, which is defined by the claims.

[0043] In this specification, it is to be understood that the drawings are not drawn to scale and that the various features of the application are illustrated in a simplified form and are not intended to be limiting of the scope of the application.

[0044] In the drawings, like or similar elements are referred to by like reference numbers throughout the several drawings.

[0045] In the description of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0046] In addition, the experimental methods used in the following examples are conventional methods unless otherwise specified. The materials, reagents, etc. used in the following examples can be obtained from commercial sources unless otherwise specified.

[0047] Figure 1 Structure diagram of the retroreflective sheet with a base material and a carbon tape printed according to the embodiment of the present application. Referring to Figure 1 The present application provides a retroreflective sheet with a base material and a carbon tape printed, which comprises, from top to bottom, a retroreflective structure layer 1, a mirror reflective layer 4 and a base material layer 2; wherein the base material layer 2 and the mirror reflective layer 4 are connected by an adhesive layer 3.

[0048] In some embodiments of the present application, the base material layer of the ribbon base printable retroreflective sheeting can be a single layer of resin film or a laminated film having multiple layers of resin film. Specifically, the base material layer of the present application can be provided with one, two, three or four layers of resin film of the same or different materials. These resin films can be laminated by adhesion of the adhesive component therebetween. Typically, when the retroreflective sheeting of the present application has a two-layer resin film structure, the second layer of resin film is adhered to the first layer of resin film by the adhesive component to form a base material layer having a two-layer resin film structure. In the case of a three-layer or more structure, the adhering can be performed sequentially in the same manner as in the case of a two-layer structure. As shown in FIG. 20, as one example, the base material layer can be a laminated film of three layers of resin film 201. Figure 1

[0049] In one embodiment of the present application, the thickness of the base material layer of the retroreflective sheeting provided by the present application can be 188 to 1000 μm, preferably 300 to 600 μm, from the viewpoint of facilitating carbon ribbon printing. If the thickness of the base material layer is too small, the self-supporting property of the entire retroreflective sheeting is poor, and if the thickness of the base material layer is too large, the rigidity of the entire retroreflective sheeting is too large, resulting in difficulty in carbon ribbon printing. In addition, the thickness of each layer of resin film in the base material layer is not particularly limited and can be 100 to 200 μm. From the viewpoint of the resin film industry, it is generally difficult to provide a single layer of resin film having a thickness of more than 200 μm, and it is particularly difficult to provide a single layer of PET film having a thickness of more than 400 μm, or such resin film is expensive due to the high cost, and thus the present application can achieve a high thickness of the base material layer at a low cost by laminating multiple layers of resin film.

[0050] In addition, the type of the adhesive component between the multiple layers of resin film is not particularly limited and the same or similar component as the adhesive composition described below can be used.

[0051] In some preferred embodiments of the present application, the ribbon base printable retroreflective sheeting is provided with a base material layer having two or three layers of resin film. More specifically, as shown in FIG. 20, the ribbon base printable retroreflective sheeting is provided with a base material layer 2 formed of two layers of resin film, each having a thickness of 188 to 200 μm. In this more preferred embodiment, the base material layer formed of two layers of resin film can solve the problem of the limited availability of resin film products having a thickness of more than 200 μm or more than 400 μm on the market, and can ensure the softness and support of the retroreflective sheeting more than a single layer, and is more advantageous for printing by a carbon ribbon printer. Figure 1

[0052] ​​In some embodiments of the present application, the material of the substrate layer can be selected from polyester (polyethylene terephthalate (PET), polybutylene terephthalate (PBT)) or polycarbonate (PC). In particular, PET and PC materials are more excellent than polyvinyl chloride (PVC), polyethylene (PE) and other materials in terms of high and low temperature resistance and environmental protection, and have lower toxicity and better economy. The material of the substrate layer of the retroreflective sheet of the present application is selected from PET or PC (in particular, as mentioned above, in the case of a total thickness of 188-1000 μm in the retroreflective sheet), which, while satisfying the stiffness of the material when printing the retroreflective sheet using a carbon ribbon printer, is softer than metal material and is conducive to printing using a carbon ribbon printer. Furthermore, unlike other materials, when the material of the substrate layer of the retroreflective sheet of the present application is selected from PET or PC, the retroreflective sheet obtained is suitable for carbon ribbon printer printing and does not damage the printer head or significantly reduce the service life of the printer head.

[0053] Further, for the adhesive layer of the present application, which is used to bond the mirror reflective layer and the substrate layer, it is necessary to provide long-term reliable bonding strength, and to advantageously remove bubbles and processing defects during coating or bonding. Therefore, in the present application, the adhesive layer is required to have a breaking strength of 1.7 N / mm 2 Hereinafter, the elongation is 220 mm or more, and the 90° angle peeling force is 10 N / 25 mm or more. In the present application, the adhesive layer is preferably required to have a breaking strength of 1.68 N / mm 2 Hereinafter, 1.66 N / mm 2 Hereinafter, 1.65 N / mm 2 Hereinafter, or 1.6 N / mm 2 Hereinafter, 1.5 N / mm 2 Hereinafter. In the present application, the adhesive layer is preferably required to have an elongation of 300 mm or more, 350 mm or more, 400 mm or more, 450 mm or more, or 500 mm or more. In the present application, the adhesive layer is preferably required to have a 90° angle peeling force of 12 N / 25 mm or more, 15 N / 25 mm or more, 20 N / 25 mm or more, or 25 N / 25 mm or more. The breaking strength and elongation can be measured using a tensile strength tester (e.g., Shimadzu Tensile Strength Tester (AGJ50N), Universal Tensile Tester, etc.) with a measurement range of 1-500 N and an accuracy of 0.1 N, in a 23°C constant temperature room, at a speed of 300 mm / min, and with a sample width of 40 mm, a length of 150 mm, and a thickness of 40 μm, and wound into a 40 mm long cylinder. The angle during peeling test is 90 degrees, the temperature is room temperature 23°C, and the force of the adhesive layer peeled from the substrate layer or the substrate layer peeled from the adhesive layer is tested.

[0054] As for the material of the adhesive layer of the present application, there is no particular limitation as long as the above-mentioned limitation is satisfied, and for example, a combination of one or more of an acrylic adhesive, an epoxy adhesive, a polyurethane adhesive, a phenolic adhesive, and the like, and a corresponding curing agent / crosslinking agent component can be used. Preferably, an acrylic adhesive can be used. As for the manner of use of the adhesive layer, there is no particular limitation, and it can be formed on the adherend surface of the base material layer and / or the mirror surface reflection layer by a conventional coating method.

[0055] In some preferred embodiments of the present application, in order to make the printed content of the carbon tape printed retroreflective sheet more obvious and prominent, the material of the adhesive layer is selected to be a black adhesive. When the retroreflective sheet is used for a temporary license plate, in order to improve the signing problem of the temporary license plate, a black adhesive can be selected as the adhesive layer.

[0056] In some embodiments of the present application, the thickness of the adhesive layer is 10 μm to 160 μm, preferably 20 μm to 80 μm, and more preferably 30 μm to 50 μm.

[0057] Based on the use of the adhesive and the base material layer of the present application, when the mirror surface reflection layer 4 is adhered to the base material, the generation of bubbles or poor adhesion can be avoided, and after adhesion, problems such as peeling and bulging are not easy to occur, and even when exposed to light and moisture, improved and durable adhesion can be provided.

[0058] In addition, for the retroreflective structure layer of the present application, in some specific embodiments of the present application, it can be a glass bead type retroreflective structure layer, or a micro-prism type retroreflective structure layer.

[0059] For the glass bead type retroreflective structure layer, typically, it can include an optional light transmissive protective layer (referred to as a protective layer); a light transmissive support layer (referred to as a support layer), the opposite side of the light incident side of the light transmissive support layer has a layer of glass microbead balls placed, and half of the balls are embedded in the support layer, the side of the glass microbead balls not embedded in the support layer is a light focal point forming layer (or a focusing layer), and the focusing layer has a mirror surface reflection layer (referred to as a reflection layer) below, and the reflection layer is generally not in contact with the glass microbeads.

[0060] For the micro-prism type retroreflective structure layer, a metal evaporation micro-prism type reflection structure layer can be typically used, which can have a light transmissive protective layer and a mirror surface reflection layer, etc. A three-prism type solid angle retroreflective element layer with an opposite face of about 90° is provided between the protective layer and the mirror surface reflection layer, and the retroreflective element layer can be provided with a mirror surface reflection layer downward.

[0061] In the present application, preferably, a glass bead type retroreflective structure layer can be used as the retroreflective structure layer 1.

[0062] Specifically, as shown in Figure 1 The retroreflective structure layer 1 is a glass-bead type retroreflective structure layer, which comprises, from top to bottom, a support layer 102, glass microbeads 103, and a focusing layer 104. In some more preferred embodiments of the present application, the support layer of the retroreflective structure layer can further have a protective layer 101.

[0063] In addition, as shown in Figure 1 A printing layer 105 is further provided between the protective layer 101 and the support layer 102 to realize printing or printing of identifiable marks.

[0064] Embodiments

[0065] The present application will be illustrated by the following examples.

[0066] Example 1: Test of the retroreflective sheet provided by the present application with a base material and a carbon tape printer.

[0067] I. Preparation method of the retroreflective sheet

[0068] 100 parts by weight of an acrylic resin (trade name: RS-3000, Enshinai (Hangzhou) Film Co., Ltd.), 22 parts by weight of a color former (trade name: AR-6300, TOKUSHIKI Co., Ltd.), 13.6 parts by weight of an isocyanate crosslinking agent (trade name: Sumijoule N-75, Sumika Bayer Urethane Co., Ltd.), and 20 parts by weight of toluene and 10 parts by weight of methyl isobutyl ketone (MIBK) as solvents were mixed and stirred to prepare a resin compounding solution for forming a support layer, which was then coated on a protective layer and dried at 100°C for 5 minutes to form a support layer with a thickness of about 13 μm and a transmittance of 10% on the side opposite to the focusing layer;

[0069] Glass microspheres (trade name: NB-23S, Enshinai (Hangzhou) Film Co., Ltd.) were attached to the support layer and heat treated at 145°C for 3 minutes and 30 seconds, so that the glass microspheres were immersed in the support layer in a form that the glass microspheres were exposed from the support layer, and the glass microspheres were kept in the support layer at about 75% of the diameter of the glass microspheres.

[0070] A resin mixture solution for the focusing layer was prepared by mixing and stirring 100 parts by weight of an acrylic resin solution (trade name: RS-5000, Enshilai (Hangzhou) Film Co., Ltd.), 5.5 parts by weight of a methylated melamine resin solution (trade name: NIKALAC MS-11, SANWA CHEMICAL CO., LTD.), and 39.3 parts by weight of a solvent (MIBK / toluene = 4 / 6, by volume). The resin mixture solution was applied to the holding layer and the glass beads and dried to form a focusing layer having an average thickness of about 23 μm.

[0071] Subsequently, an aluminum mirror surface reflection layer was formed by vacuum deposition on the focusing layer.

[0072] An adhesive component was prepared by mixing and stirring 100 parts of an acrylic resin, 3 parts of an isocyanate, and 5 parts of EAC. The adhesive component was applied to the mirror surface reflection layer to form an adhesive layer having a thickness of about 40 μm. Different substrates (0.4 mm thick iron sheet, 0.4 mm thick aluminum sheet, 0.4 mm thick PVC plate, 0.4 mm thick plastic white plate (acrylic), 0.4 mm thick PC plate, and PET) were attached to the adhesive layer. If necessary, the adhesive component was applied again and attached to the substrates (for example, two layers of 0.4 mm thick PET).

[0073] II. Test Method

[0074] The retroreflective sheet prepared above was tested for printing effect, print head damage, influence on print head life, stiffness, and the like.

[0075] The stiffness test method and criteria are as follows: two flat blocks having a height of 20 mm or more, a length of 200 mm, and a width of 100 mm, a 440 mm long retroreflective sheet, a 340 mm space, and the two ends each having a length of 50 mm placed on the blocks. The height was measured, and if the middle end and the two ends have the same height or the middle end is 1 mm lower than the two ends, it is rated as "O". If the middle end is 1 mm to 4 mm lower than the two ends, it is rated as "Fair". If the middle end is 4 mm or more lower than the two ends, it is rated as "Poor".

[0076] The printing effect test method and criteria are as follows: "X" if printing is not possible or the printed characters are unclear, or if there are many white spots, which affect the visibility; "O X" if the printed characters are generally clear, but there are occasional rough edges and jagged edges; and "O" if the printed characters are very clear, and there are no rough edges, jagged edges, raised edges, or white spots.

[0077] III. Experimental Results

[0078] The results are shown in Table 1 below. The use of 0.4 mm PC plate and two layers of 0.4 mm thick PET as the base material has a better printing effect and does not damage the print head or affect the service life of the print head. In particular, the use of two layers of 0.4 mm thick PET as the base material has a better printing effect and the service life of the print head is up to 30 kilometers to 50 kilometers.

[0079] Table 1: Test results of different base materials of retroreflective sheet suitable for carbon ribbon printer

[0080]

[0081] Example 2: Durability test of the retroreflective sheet with base material suitable for carbon ribbon printing provided by the present application

[0082] I. Preparation of the adhesive layer

[0083] The following formulations 1 to 3 of the adhesive component were used to form the adhesive layer, which was then placed in an environment of 23°C ± 3°C for 24 hours, and then the breaking strength, elongation and peel force were tested.

[0084] Formulation 1: 100 parts of Enthek acrylic resin, 3 parts of isocyanate and 5 parts of EAC.

[0085] Formulation 2: 100 parts of Enthek acrylic resin, 10 parts of polyisocyanate curing agent and 25 parts of EAC.

[0086] Formulation 3: 100 parts of Enthek acrylic resin, 1 part of epoxy active agent and 17 parts of EAC.

[0087] II. Test of breaking strength, elongation and peel force of the adhesive layer

[0088] In this example, the breaking strength, elongation and peel force were tested using a Shimadzu strength and elongation machine (AGJ50N) with a measurement range of 1-500 N, an accuracy of 0.1 N, a measurement environment of 23°C constant temperature room, a speed of 300 mm / min and a peel force angle of 90 degrees.

[0089] For breaking strength and elongation, the adhesive layer prepared in the above different formulations was made into a sample with a width of 40 mm, a length of 150 mm and a thickness of 40 μm, and was rolled into a 40 mm long cylinder. The Shimadzu strength and elongation machine (AGJ50N) was used to stretch to break at a speed of 300 mm / min. The following formula was used for calculation:

[0090] Breaking area: sample length (mm) x thickness (μm) ÷ 1000;

[0091] Breaking strength (N / mm 2 ) = measured value (N) / breaking area.

[0092] wherein the measured value is the value of the force displayed by the tensile strength machine when the sample is broken by stretching, and the elongation is the value of the length displayed by the tensile strength machine when the sample is broken by stretching.

[0093] For the peeling force, the adhesive layer prepared by the above-mentioned different formulations was coated on the untreated PET, cut into 25 mm x 150 mm, and then adhered to a 50 mm x 300 mm SUS stainless steel plate, respectively, at 23°C for 24 hours. Then, a tensile strength machine was used to detect the peeling force of the PET from the adhesive layer (i.e., the peeling force of the adhesive layer from the PET) at a speed of 300 mm / min. In this embodiment, it is expressed as N / 25 mm.

[0094] The test results are as follows:

[0095] Adhesive layer prepared by Formulation One: strength 1.65 N / mm, elongation 459.3 mm, 90-degree peeling force 26 N / 25 mm; 2

[0096] Adhesive layer prepared by Formulation Two: strength 1.66 N / mm, elongation 220 mm, 90-degree peeling force 12 N / 25 mm; 2

[0097] Adhesive layer prepared by Formulation Three: strength 1.92 N / mm, elongation 190 mm, 90-degree peeling force 8 N / 25 mm. 2

[0098] III. Durability test of retroreflective sheeting with base material for carbon tape printing

[0099] Using the "retroreflective sheeting preparation method" in Example 1, different substrates: PVC, ABS, PC, and acrylic were used to prepare retroreflective sheeting with adhesive layers of the above-mentioned different formulations of adhesive components, and the surface conditions were observed after being placed at 23°C, 40°C, 50°C, and / or 70°C for one month, respectively. The specific results are shown in Tables 2 to 5 below.

[0100] Table 2: Durability test results of retroreflective sheeting with PVC as the substrate

[0101] Formulation 1 Formulation 2 Formulation 3 23°C * 1 month No abnormalities No abnormalities No abnormalities 40°C * 1 month No abnormalities No abnormalities No abnormalities 70°C * 1 month No abnormalities No abnormalities Bulging, bubbles

[0102] Table 3: Durability test results of retroreflective sheeting with ABS as the substrate

[0103] Formulation 1 Formulation 2 Formulation 3 23°C * 1 month No abnormalities No abnormalities No abnormalities 40°C * 1 month No abnormalities No abnormalities No abnormalities 50°C * 1 month No abnormalities No abnormalities Bulging, bubbles

[0104] Table 4: Durability test results of retroreflective sheeting with PC as the substrate

[0105] Formulation 1 Formulation 2 Formulation 3 23°C * 1 month No abnormalities No abnormalities No abnormalities 40°C * 1 month No abnormalities No abnormalities No abnormalities 50°C * 1 month No abnormalities No abnormalities Bulging, bubbles ​​​

[0106] Table 5: Durability test results of retroreflective sheeting with acrylic substrate

[0107] Formulation 1 Formulation 2 Formulation 3 23°C * 1 month No abnormalities No abnormalities No abnormalities 40°C * 1 month No abnormalities No abnormalities No abnormalities 50°C * 1 month No abnormalities No abnormalities Bulging, bubbles

[0108] It can be seen that the strength of the retroreflective sheeting prepared by Formulation One and Formulation Two is 1.7N / mm 2 In the following, the adhesive layer with elongation of 210mm or more and peeling force of 10N / 25mm or more can obtain more durability based on different substrates, for example, the retroreflective sheeting can still not have the phenomenon of bulging and blistering after being placed at 50-70°C for more than 1 month.

[0109] The above description presented by the exemplary embodiments is only used to illustrate the technical solutions of the present application, and is not intended to be all-inclusive, nor is it intended to limit the present application to the precise forms described. Obviously, many changes and variations are possible for those skilled in the art based on the above teachings. The exemplary embodiments are selected and described in order to explain the specific principles of the present application and its practical application, so that other skilled persons in the art can easily understand, implement and utilize various exemplary embodiments of the present application and various selected forms and modified forms thereof. The scope of protection of the present application is intended to be defined by the appended claims and their equivalent forms.

Claims

1. A retroreflective sheeting printable with a ribbon having a substrate, characterized by, The retroreflective sheet printed by the carbon tape with the base material comprises, from top to bottom, a retroreflective structure layer, a mirror surface reflection layer and a base material layer. The mirror layer and the base material layer are connected by an adhesive layer, and the adhesive layer has a breaking strength of 1.7 N / mm 2 Hereinafter, the elongation is 220 mm or more, and the peeling force at a 90° angle is 10 N / 25 mm or more; the base material layer is selected from a laminated film of a single layer or multiple layers of a resin film, The thickness of the base material layer is 300-600 μm.

2. The retroreflective sheeting printable with carbon-based ribbon with a substrate according to claim 1, characterized in that, The retroreflective structure layer is a glass micro-bead type or a micro-prism type.

3. The retroreflective sheeting printable with carbon-based tape of claim 1 or 2, wherein, The retroreflective structure layer is a glass micro-bead type, comprising a supporting layer, glass micro-beads and a focusing layer.

4. The retroreflective sheeting printable with carbon-based ribbon of claim 3 wherein, The uppermost layer of the retroreflective structure layer further comprises a protective layer.

5. The retroreflective sheeting printable with carbon-based ribbon of claim 4 wherein, A printing layer is arranged between the protective layer and the supporting layer.

6. The ribbon-backed, carbon printable retroreflective sheeting of any of claims 1, 2, 4 and 5, wherein, The base material layer is provided with one, two, three or four resin film layers, which are of the same or different materials and are adhered by adhesive components.

7. The ribbon-backed, carbonizable, retroreflective sheeting of any of claims 1, 2, 4, and 5, wherein, The thickness of the adhesive layer is 10-160 μm.

8. The ribbon-backed, carbonizable, retroreflective sheeting of any of claims 1, 2, 4, and 5, wherein, The material of the base material layer is selected from polyethylene terephthalate or polycarbonate.

9. The ribbon-backed, carbonizable, retroreflective sheeting of any of claims 1, 2, 4, and 5, wherein, The retroreflective sheet is directly printed on a carbon tape printer without film pasting.

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