CN116338841A - Retroreflective sheet with base material and capable of being printed by carbon tape - Google Patents
Retroreflective sheet with base material and capable of being printed by carbon tape Download PDFInfo
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- CN116338841A CN116338841A CN202111582225.9A CN202111582225A CN116338841A CN 116338841 A CN116338841 A CN 116338841A CN 202111582225 A CN202111582225 A CN 202111582225A CN 116338841 A CN116338841 A CN 116338841A
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/12—Reflex reflectors
- G02B5/126—Reflex reflectors including curved refracting surface
- G02B5/128—Reflex reflectors including curved refracting surface transparent spheres being embedded in matrix
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Optical Elements Other Than Lenses (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
The invention provides a carbon tape-printable retroreflective sheet with a base material, which comprises a retroreflective structural layer, a specular reflection layer and a base material layer, wherein the retroreflective structural layer is arranged on the retroreflective structural layer; wherein the specularly reflective layer is connected with the substrate layer by an adhesive layer, and the fracture strength of the adhesive layer is 1.7N/mm 2 The elongation is more than 220mm, and the peeling force at an angle of 90 degrees is more than 10N/25 mm; the base material layer is selected from laminated films of single-layer or multi-layer resin films, and the thickness of the base material layer is 188-1000 mu m.
Description
Technical Field
The invention belongs to the technical field of retroreflective products, and particularly relates to a retroreflective sheet with a base material and capable of being printed by a carbon tape.
Background
Retroreflective articles, such as retroreflective sheeting (retroreflective sheeting), are characterized by their ability to redirect light to its original source. Retroreflective articles have found use in a variety of applications, such as for safety clothing, traffic signs, authentication labels, license plates, and security documents.
The existing reflective film is usually provided with an adhesive layer and release paper (or release PET, CPP and the like), and when the reflective film is prepared by a manufacturer, a lamination process is needed, so that the production cost is increased. Meanwhile, after a user purchases such a reflective film, it is generally necessary to peel off the release paper and then adhere the reflective film to a base material such as plastic, metal, or the like. And, because the base materials to which the reflective film is attached are different, the reflective film is curled, cracked, swelled and the like after being used. For example, the currently available labels, due to the different plastic materials used, curl, crack after use at high temperature or in other environments, or swell or release the retroreflective film because the plasticizer in the plastic volatilizes affecting the performance of the adhesive layer.
In addition, the surface of the reflective film needs to be printed with information, such as characters and marks, by a carbon tape printer, and the carbon tape printer is not suitable for a carbon tape printer because the carbon tape printer is suitable for relatively thin or soft materials such as paper labels, self-adhesive tapes and the like, such as attaching the reflective film to a substrate and then printing. For example, if the retroreflective film is attached to a metal material, printing on the carbon tape printer is not possible due to the metal material being too hard, and the print head life of the carbon tape printer is severely affected. For example, the reflective film is attached to the plastic plate, although the stiffness can meet a certain requirement and is softer than the metal material, so that the printing of the carbon tape is facilitated, but due to the technical and structural problems of the existing carbon tape printer, not all plastic plates are suitable for printing of the carbon tape, and part of plastic plates cannot be printed or the printing head of the printer is directly damaged, or the service life of the printing head is obviously shortened.
The citation 1 provides a novel motor vehicle temporary number plate which is not easy to damage and recognize, and comprises: bear basic unit, composite bed, the composite bed is including printing layer, reflector layer, the adhesive layer that sets gradually, the composite bed set up in bear basic unit one side of adhesive layer. This document discloses that the thickness of the carrier substrate is 0.3mm to 1.0mm and that the material selection of the carrier substrate comprises: polycarbonate PC, PET, PVC, PP, PETG, ABS, stone paper, or acrylic. In addition, the surface roughness of the contact surface of the adjacent side of the bearing base layer and the adhesive layer is set as follows: ra is less than or equal to 3 mu m. And mention may be made of being printable with carbon tape.
Citation literature:
citation 1: CN112248945A
Disclosure of Invention
Problems to be solved by the invention
Although printable retroreflective sheeting has been studied to some extent in the prior art. The inventors have found the following problems in long-term practice: reference 1 proposes a printable retroreflective film having a carrier substrate, but on the one hand, although it has a carbon tape printability, the overall structure of its composite layer is relatively simple; on the other hand, although the surface roughness of the adhesive surface of the carrier base layer is reduced in order to improve the bonding property of the carrier base layer and the adhesive layer, the carrier base material needs special surface processing, and in addition, the too low roughness also causes unnecessary slippage in the bonding process, and the edge is easy to cause glue overflow and alignment problems. More importantly, even if the problem of surface roughness is satisfied, it has been found that over long periods of time, there is still a problem of failure of the adhesive layer as exposure to outdoor (light, aging, etc.) time builds up.
Therefore, based on the practice of the prior art, the invention provides the carbon tape-printable retroreflective sheet with the base material, which can be used as a battery bicycle license plate, a temporary license plate and the like, and a user can print the carbon tape by himself, so that the process is reduced and the cost is saved. And solves the problems that when the retroreflective sheet is stuck on the base material, the printing life (such as broken needle and the like) cannot be printed or is influenced when the relatively hard plastic plate or metal plate is printed. The carbon tape printing retroreflective sheet with the base material can normally print the carbon tape without influencing the printing service life, and can solve the problem of detachment and bulge caused by the base material problem of the conventional retroreflective sheet. Meanwhile, the retroreflective sheet of the invention can be provided for customers in a roll form with a base material, and the customers can cut the size according to own needs. And the die-cut size and shape can be provided for customers according to the needs of the customers.
Solution for solving the problem
Through long-term research of the inventor, the technical problems can be solved through implementation of the following technical scheme:
[1] the invention provides a carbon tape-printable retroreflective sheet with a base material, wherein the carbon tape-printable retroreflective sheet with the base material sequentially comprises a retroreflective structure layer, a specular reflection layer and a base material layer from top to bottom; wherein, the liquid crystal display device comprises a liquid crystal display device,
the specularly reflective layer is connected with the substrate layer through an adhesive layer, and the fracture strength of the adhesive layer is 1.7N/mm 2 The elongation is more than 220 mm; the peeling force at an angle of 90 degrees is more than 10N/25 mm; the substrate layer is selected from a laminated film of a single-layer or multi-layer resin film,
the thickness of the substrate layer is 188-1000 mu m.
[2] The carbon tape printable retroreflective sheet with a substrate according to [1], wherein the retroreflective structure layer is a glass microsphere type retroreflective structure layer or a microprism type retroreflective structure layer.
[3] The carbon tape printable retroreflective sheet with a substrate according to [1] or [2], wherein the retroreflective structural layer is a glass bead type retroreflective structural layer comprising a supporting layer, glass beads and a focusing layer.
[4] The carbon tape printable retroreflective sheet with a substrate according to [3], wherein the uppermost layer of the retroreflective structure layer further comprises a protective layer.
[5] The carbon tape printable retroreflective sheet with a substrate according to [4], wherein a print layer is further provided between the protective layer and the support layer.
[6] The carbon tape printable retroreflective sheet with a substrate according to any one of [1] to [5], wherein the substrate layer is provided with one, two, three or four resin film layers, and the film layers are the same or different in material, and the multilayer resin films are bonded by an adhesive component.
[7] The carbon tape-printable retroreflective sheet with a substrate according to any one of [1] to [6], wherein the thickness of the adhesive layer is 10 μm to 160 μm.
[8] The carbon tape-printable retroreflective sheet with a substrate according to any one of [1] to [7], wherein the material of the substrate layer is selected from polyethylene terephthalate or polycarbonate.
[9] The carbon tape-printable retroreflective sheet of any one of [1] to [8], wherein the retroreflective sheet is directly printed on a carbon tape printer without a film.
ADVANTAGEOUS EFFECTS OF INVENTION
Through implementation of the technical scheme, the carbon tape-printable retroreflective sheet with the base material has the following technical effects:
1) Solves the problem that the base material is too thick and hard to print the carbon tape, and can improve the printing effect and damage to the printing head.
2) The base material is directly made on the retroreflective sheet, so that a user omits a bonding link, the operation is simple and convenient, meanwhile, a manufacturer omits a bonding process link, the production cost is saved, the process of sticking the retroreflective sheet on an aluminum plate or other base materials after the preparation of the retroreflective sheet is finished in the prior art can be replaced, and the products such as labels or simple license plates can be directly manufactured by directly carrying out processes such as die cutting, blanking, punching and the like;
3) The PET or PC board thickness in the current market is limited and expensive, and the two-pass to four-pass coating structure can well solve the problems, improve the productivity and save the cost, and can solve the problem that the current reflective material processing equipment cannot be coated and attached due to the too thick substrate.
Drawings
Fig. 1 is a schematic structural view of a carbon tape-printable retroreflective sheet with a substrate according to an embodiment of the present invention.
Reference numerals illustrate:
1. a retroreflective structure layer;
2. a substrate layer;
3. an adhesive layer;
4. a specular reflection layer;
101. a protective layer; 102 a support layer; 103 glass beads; 104 a focusing layer; 105 print layers;
201. and (3) a resin film.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and technical schemes. The following description of the technical features is based on the representative embodiments and specific examples of the present invention, but the present invention is not limited to these embodiments and specific examples. It should be noted that:
in the present specification, the numerical range indicated by the term "numerical value a to numerical value B" means a range including the end point numerical value A, B.
In the present specification, a numerical range indicated by "above" or "below" is a numerical range including the present number.
In the present specification, the meaning of "can" includes both the meaning of performing a certain process and the meaning of not performing a certain process.
In this specification, the use of "optional" or "optional" means that certain substances, components, steps of performing, conditions of applying, etc. may or may not be used.
Reference throughout this specification to "some specific/preferred embodiments," "other specific/preferred embodiments," "an embodiment," and so forth, means that a particular element (e.g., feature, structure, property, and/or characteristic) described in connection with the embodiment is included in at least one embodiment described herein, and may or may not be present in other embodiments. In addition, it is to be understood that the elements may be combined in any suitable manner in the various embodiments.
In this specification, it should be understood that the drawings are not necessarily to scale, but are merely drawn appropriately to illustrate various features of the basic principles of the invention. Specific design features of the invention disclosed herein, including for example, specific dimensions, orientations, positions, and configurations, will be determined in part by the specific intended application and use environment.
In the drawings, like or equivalent parts (elements) are referred to by like reference numerals.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
The experimental methods used in the following examples are conventional methods unless otherwise specified. Materials, reagents and the like used in the examples described below are commercially available unless otherwise specified.
Fig. 1 is a schematic structural view of a carbon tape-printable retroreflective sheet with a substrate according to an embodiment of the present invention. Referring to fig. 1, the invention provides a carbon tape-printable retroreflective sheet with a base material, which comprises a retroreflective structure layer 1, a specular reflection layer 4 and a base material layer 2 from top to bottom in sequence; wherein the substrate layer 2 and the specular reflection layer 4 are connected by an adhesive layer 3.
In some specific embodiments of the present invention, the substrate layer of the carbon tape-printable retroreflective sheet with substrate may be a single layer of resin film or a laminated film having multiple layers of resin films. Specifically, the substrate layer of the present invention may be provided with one, two, three or four resin films of the same or different materials. These resin films may be laminated by adhesion of adhesive components. Typically, when the retroreflective sheet of the present invention has a two-layer resin film structural layer, the second layer resin film is adhered to the first layer resin film by an adhesive component to form a base material layer having a two-layer resin film structure. When having a three-layer or more structure, the pasting mode is the same as the case of a two-layer structure, and pasting can be performed sequentially. As shown in fig. 1, as an example, the base material layer may be a laminated film of 3 layers of resin films 201.
In a specific embodiment of the present invention, in the retroreflective sheet provided by the present invention, the thickness of the base material layer may be 188 to 1000 μm, preferably 300 to 600 μm, from the viewpoint of facilitating printing of the carbon tape, and the thickness of the base material layer is too small, so that the self-supporting property of the entire retroreflective sheet is poor, and if the thickness of the base material layer is too large, the rigidity of the entire retroreflective sheet is too large, resulting in difficulty in printing of the carbon tape. The thickness of each resin film in the base material layer is not particularly limited, and may be 100 to 200. Mu.m. In view of the resin film industry, it is generally difficult to provide a resin film of 200 μm or more in a single layer and a resin film (particularly, PET film) of 400 μm or more in a single layer, or such a resin film is expensive in the market due to excessive cost, and therefore, the present invention can realize a substrate layer of high thickness at low cost by laminating a plurality of resin films.
In addition, the kind of the adhesive component between the multilayer resin films is not particularly limited, and the same or similar component as the adhesive composition to be described later may be used.
In some preferred embodiments of the present invention, a carbon tape-printable retroreflective sheet with a base material is provided with a base material layer having two or three resin films. More specifically, as shown in fig. 1, the carbon tape-printable retroreflective sheet with a base material is provided with a base material layer 2 formed of two resin films, each having a thickness of 188 to 200 μm. In this more preferred embodiment, the substrate layer formed of the two resin films can solve the problem that resin film products currently commercially available with a thickness of more than 200 μm or more than 400 μm are limited, and the flexibility and the support of the retroreflective sheet can be ensured more than a single layer, which is more advantageous for printing by a carbon tape printer.
In some embodiments of the present invention, the substrate layer material may be selected from polyester (polyethylene terephthalate (PET), polybutylene terephthalate (PBT)) or Polycarbonate (PC). In particular, PET and PC materials are more excellent in high and low temperature resistance and environmental protection than polyvinyl chloride (PVC), polyethylene (PE) and other materials, and have lower toxicity and better economical efficiency. The material of the substrate layer of the retroreflective sheet of the present invention is PET or PC (particularly, in the case of the total thickness of 188 to 1000 μm in the retroreflective sheet mentioned above), and is softer than a metal material while satisfying the stiffness of the material when the retroreflective sheet is printed by a carbon tape printer, which is advantageous for printing by a carbon tape printer. In addition, when the material of the base material layer of the retroreflective sheet is PET or PC, which is obviously different from other materials, the retroreflective sheet prepared by the method is suitable for printing by a carbon ribbon printer, does not damage a printing head of the printer, and does not obviously reduce the service life of the printing head.
Further, for the adhesive layer of the present invention, it is used for bonding the specular reflection layer of the present invention and the substrate layer. For the adhesive of the present invention, it is necessary to provide a long-lasting reliable adhesive strength, and also to be able to advantageously remove the problems of bubbles and processing failure at the time of coating or adhesion. Therefore, in the present invention, the adhesive layer is required to have a breaking strength of 1.7N/mm 2 The elongation is 220mm or more, and the peel force at 90 DEG angle is 10N/25mm or more. In the present invention, it is preferable that the adhesive layer has a breaking strength of 1.68N/mm 2 The following is 1.66N/mm 2 The following is 1.65N/mm 2 Below, or at 1.6N/mm 2 The following is 1.5N/mm 2 The following is given. In the present invention, it is preferable that the elongation of the adhesive layer is 300mm or more, 350mm or more, 400mm or more, 450mm or more, or 500mm or more. In the present invention, the adhesive layer is preferably required to have a peel force at an angle of 90℃of 12N/25mm or more, 15N/25mm or more, 20N/25mm or more, or 25N/25mm or more. The breaking strength and elongation can be measured by using a measuring machine (for example, shimadzu machine (AGJ N), universal tensile tester, etc.) having a measuring range of 1 to 500N and an accuracy of 0.1N, and the measuring environment is a constant temperature chamber at 23℃at a speed of 300mm/min, and the sample has a width of 40mm, a length of 150mm, a thickness of 40 μm, and is rolled into a cylinder 40mm long. The angle at which the adhesive layer was peeled off from the substrate layer or the force at which the substrate layer was peeled off from the adhesive layer was measured at 90 degrees at a temperature of 23℃at room temperature.
The material of the adhesive layer of the present invention is not particularly limited in principle as long as the above-mentioned limitations are satisfied, and for example, one or a combination of more of an acrylic adhesive, an epoxy adhesive, a urethane adhesive, a phenolic adhesive, and the like, and a corresponding curing agent/crosslinking agent component may be used. Preferably, an acrylic adhesive may be used. The adhesive layer may be formed on the adherend surface of the substrate layer and/or the specular reflection layer by a conventional coating method.
In some preferred embodiments of the present invention, the adhesive layer is made of a black adhesive to make the print of the carbon tape-printable retroreflective sheeting more visible and noticeable. When the retroreflective sheet is used for a temporary license plate, a black adhesive may be selected as the adhesive layer in order to improve the issue of registration of the temporary license plate.
In some embodiments of the invention, the adhesive layer has a thickness of 10 μm to 160 μm, preferably 20 μm to 80 μm, more preferably 30 μm to 50 μm.
The adhesive and the substrate layer according to the present invention can prevent the occurrence of bubbles or poor adhesion when the specular reflection layer 4 is adhered to the substrate, and can provide improved durable adhesion even when exposed to light or moisture.
In addition, in some embodiments of the present invention, the retroreflective structure layer may be a glass bead type retroreflective structure layer or a microprism type retroreflective structure layer.
For glass bead retroreflective structure layers, an optional light transmissive protective layer (abbreviated protective layer) may typically be included; a light-transmitting support layer (support layer for short), wherein a layer of glass microsphere is arranged on the opposite side of the light incidence side of the light-transmitting support layer, half of the glass microsphere is embedded in the support layer, a layer of light focus forming layer (or focusing layer) is arranged on the side of the glass microsphere which is not embedded in the support layer, a mirror reflection layer (or reflection layer for short) is arranged below the focusing layer, and the reflection layer is not in contact with the glass microsphere.
As the microprism type retroreflective structure layer, a metal vapor microprism type retroreflective structure layer may be generally used, and may have a light transmissive protective layer, a specular reflection layer, and the like. A triangular pyramid type solid angle retro-reflection element layer with the opposite surface of about 90 degrees is arranged between the protective layer and the specular reflection layer, and the retro-reflection element layer can be downwards provided with the specular reflection layer.
In the present invention, it is preferable that a glass bead type retroreflective structure layer be used as the retroreflective structure layer 1.
Specifically, as shown in fig. 1, the retroreflective structure layer 1 is a glass bead type retroreflective structure layer that includes, from top to bottom, a support layer 102, glass beads 103, and a focusing layer 104. In some more preferred embodiments of the present invention, the support layer of the retroreflective structure layer may also have a protective layer 101 thereon.
In addition, as shown in fig. 1, a print layer 105 is further provided between the protective layer 101 and the support layer 102 to enable printing or printing of the identifiable mark.
Examples
The present invention will be illustrated by examples.
Example 1: the retroreflective sheet with the base material and the carbon tape printing function is suitable for testing a carbon tape printer.
1. Method for preparing retroreflective sheeting
100 parts by weight of an acrylic resin (trade name: RS-3000, england 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-based crosslinking agent (trade name: sumijolle N-75,Sumika Bayer Urethane Co, ltd.) and 20 parts by weight of toluene as a solvent and 10 parts by weight of methyl isobutyl ketone (MIBK) were mixed and stirred to prepare a resin formulation for supporting layer formation, and then the resin formulation was coated on a protective layer, and then dried at 100℃for 5 minutes to form a supporting layer having a thickness of about 13 μm on the opposite side of a focusing layer having a transmittance of 10%;
glass microspheres (trade name: NB-23S, england film Co., ltd.) were attached to the support layer, and heat-treated at 145℃for 3 minutes and 30 seconds to immerse the glass microspheres in the support layer in such a manner that the glass microspheres were exposed from the support layer, and approximately 75% of the diameter of the glass microspheres was held in the support layer.
100 parts by weight of an acrylic resin solution (trade name: RS-5000, enxi (hangzhou) film limited), 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, volume ratio) were mixed and stirred to prepare a resin formulation for a focusing layer, and the resin formulation was coated on a holding layer and glass beads and dried to form a focusing layer having an average thickness of about 23 μm.
Then, aluminum was vacuum-evaporated on top of the focusing layer, thereby obtaining a specular reflection layer.
The acrylic resin 100 part, the isocyanate 3 part and the EAC 5 part were mixed and stirred to thereby prepare an adhesive component, and the adhesive component was coated on the specular reflection layer to form an adhesive layer of about 40 μm. Next, various substrates (0.4 mm thick iron sheet, 0.4mm thick aluminum sheet, 0.4mm PVC sheet, 0.4mm plastic white board (acrylic), 0.4mm PC sheet, and PET) were attached to the adhesive layer. The adhesive component described above may be coated again and attached to a substrate (e.g., two layers of 0.4mm thick PET) depending on the thickness requirements.
2. Test method
The retroreflective sheet obtained by the above preparation was tested for printing effect, head damage, influence on the life of the head, stiffness, and the like.
The stiffness testing method and the standard are as follows: two flat blocks with the height of more than 20mm, the length of 200mm and the width of 100mm, a retroreflective sheet with the length of 440mm, a hollow space with the length of 340mm and 50mm at each end are placed on the blocks. The height is measured, if the middle end and the two ends are the same in height or lower than 1mm in the middle, the method is excellent. A range of less than 1mm to 4mm is "general". A value of 4mm or less is "poor".
Testing method and standard of printing effect: the printing cannot be performed or the printing handwriting is unclear, or the white is exposed, the white spots are very large, and the visual recognition effect is influenced by X; if the whole writing is clear, the defect of the occasional burr and saw tooth belongs to the category of O X; the characters are very clear, and have no obvious rough edges, saw teeth, edge lifting, white spots and other defects, and belong to the category of O.
3. Experimental results
The results are shown in Table 1 below, using a 0.4mm PC board, two layers of PET 0.4mm thick as a substrate, provides a more effective print without damaging the printhead or affecting printhead life. In particular, two layers of PET with the thickness of 0.4mm are taken as a base material, so that the printing effect is better, and the service life of the printing head reaches 30 km to 50 km.
Table 1: test results of retroreflective sheeting for different substrates suitable for use in a carbon tape printer
Example 2: the invention provides a carbon tape-printable retroreflection sheet durability test for tape base material
1. Preparation of adhesive layer
An adhesive layer was formed using the adhesive components of the following formulation one to formulation three, and left to stand in an environment of 23 ℃ + -3 ℃ for 24 hours, and then tested for breaking strength, elongation and peeling force.
Formula I: part 100 of Enxi acrylic resin, part 3 of isocyanate and part 5 of EAC.
And the formula II: 100 parts of Enxi acrylic resin, 10 parts of polyisocyanate curing agent and 25 parts of EAC.
And the formula III: part 100 of Enxi acrylic resin, part 1 of epoxy active agent and part 17 of EAC.
2. Testing of breaking Strength, elongation and Release force of adhesive layer
In the embodiment, the breaking strength, elongation and stripping force are detected by an Shimadzu strong elongation machine (AGJ N), the measuring range is 1-500N, the precision is 0.1N, the measuring environment is in a constant temperature chamber at 23 ℃, the speed is 300mm/min, and the stripping force angle is 90 degrees.
The adhesive layers of the different formulations prepared above were prepared as samples of 40mm width, 150mm length and 40 μm thickness for breaking strength and elongation, rolled into cylinders of 40mm length, and stretched to break at a speed of 300mm/min using an Shimadzu tensile machine (AGJ N). And calculated by the following formula:
cross-sectional area: sample length (mm) x thickness (μm)/(1000);
breaking Strength (N/mm) 2 ) Measurement (N)/cross-sectional area.
The measured value is a value of force displayed by a tensile elongation machine when the sample is subjected to tensile fracture, and the elongation is a value of length displayed by the tensile elongation machine when the sample is subjected to tensile fracture.
For the peel force, the adhesive layers of the above-prepared different formulations were respectively coated on untreated PET, and cut into 25mm. Times.150 mm, and then each adhesive layer was attached to a SUS stainless steel plate of 50 mm. Times.300 mm, and released at 23℃for 24 hours, after which the peel force of PET from the adhesive layer (i.e., the peel force of the adhesive layer from PET) was measured at a speed of 300mm/min using a tensile machine, and in this example, was expressed as N/25mm.
The test results were as follows:
adhesive layer prepared in formula one: strength of 1.65N/mm 2 Elongation 459.3mm,90 degree peel force 26N/25mm;
adhesive layer prepared in formulation two: strength of 1.66N/mm 2 Elongation 220mm,90 degree peel force 12N/25mm;
adhesive layer prepared in formulation three: strength of 1.92N/mm 2 Elongation 190mm,90 degree peel force 8N/25mm.
3. Durability test of carbon tape printable retroreflective sheeting with substrate
The "method for producing retroreflective sheeting" in example 1 was used with different substrates: PVC, ABS, PC and acrylic were prepared respectively, and the retroreflective sheeting was left at 23℃at 40℃at 50℃and/or at 70℃for one month to observe the surface condition, respectively, using the adhesive layers of the above-mentioned adhesive compositions of different formulations. The specific results are shown in tables 2 to 5 below.
Table 2: durability test results of retroreflective sheet of PVC as substrate
| Formula I | Formula II | Formulation III | |
| 23 ℃ for 1 month | No abnormality | No abnormality | No abnormality |
| 40 ℃ for 1 month | No abnormality | No abnormality | No abnormality |
| 70 ℃ for 1 month | No abnormality | No abnormality | Bulge and bubble |
Table 3: durability test results of retroreflective sheet of ABS as substrate
| Formula I | Formula II | Formulation III | |
| 23 ℃ for 1 month | No abnormality | No abnormality | No abnormality |
| 40 ℃ for 1 month | No abnormality | No abnormality | No abnormality |
| 50 ℃ for 1 month | No abnormality | No abnormality | Bulge and bubble |
Table 4: durability test results of retroreflective sheet with PC as substrate
| Formula I | Formula II | Formulation III | |
| 23 ℃ for 1 month | No abnormality | No abnormality | No abnormality |
| 40 ℃ for 1 month | No abnormality | No abnormality | No abnormality |
| 50 ℃ for 1 month | No abnormality | No abnormality | Bulge and bubble |
Table 5: durability test result of retroreflective sheet of acrylic as base material
| Formula I | Formula II | Formulation III | |
| 23 ℃ for 1 month | No abnormality | No abnormality | No abnormality |
| 40 ℃ for 1 month | No abnormality | No abnormality | No abnormality |
| 50 ℃ for 1 month | No abnormality | No abnormality | Bulge and bubble |
As can be seen, the strength obtained by the preparation of the first and second formulations was 1.7N/mm 2 In the following, the adhesive layer having an elongation of 210mm or more and a peel force of 10N/25mm or more can be provided with further durability based on the substrate, for example, the retroreflective sheet can be left at 50 to 70 ℃ for 1 month or more without swelling or foaming.
The description of the exemplary embodiments presented above is merely illustrative of the technical solution of the present invention and is not intended to be exhaustive or to limit the invention to the precise form described. Obviously, many modifications and variations are possible in light of the above teaching to those of ordinary skill in the art. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable others skilled in the art to understand, make and utilize the invention in various exemplary embodiments and with various alternatives and modifications. It is intended that the scope of the invention be defined by the following claims and their equivalents.
Claims (9)
1. The carbon tape-printable retroreflective sheet with the base material is characterized by sequentially comprising a retroreflective structural layer, a specular reflection layer and a base material layer from top to bottom; wherein, the liquid crystal display device comprises a liquid crystal display device,
the specular reflection layer passes through the substrate layerThe adhesive layers were joined, and the breaking strength of the adhesive layers was 1.7N/mm 2 The elongation is more than 220mm, and the peeling force at an angle of 90 degrees is more than 10N/25 mm; the substrate layer is selected from a laminated film of a single-layer or multi-layer resin film,
the thickness of the substrate layer is 188-1000 mu m.
2. The carbon tape printable retroreflective sheet with substrate according to claim 1, wherein the retroreflective structure layer is a glass microsphere type retroreflective structure layer or a microprism type retroreflective structure layer.
3. The carbon tape printable retroreflective sheet of claim 1 or 2, wherein the retroreflective structural layer is a glass microsphere type retroreflective structural layer comprising a support layer, glass microspheres, and a focusing layer.
4. The carbon tape printable retroreflective sheet with substrate according to claim 3, wherein the uppermost layer of the retroreflective structure layer further comprises a protective layer.
5. The carbon tape printable retroreflective sheet with a substrate according to claim 4, wherein a print layer is further provided between the protective layer and the support layer.
6. The carbon tape printable retroreflective sheet with substrate according to any one of claims 1 to 5, wherein the substrate layer is provided with one, two, three or four resin film layers, and the film layers are the same or different in material, and the multi-layered resin films are bonded by an adhesive component.
7. The carbon tape-printable retroreflective sheet with a substrate according to any one of claims 1 to 6, wherein the thickness of the adhesive layer is 10 μm to 160 μm.
8. The carbon tape printable retroreflective sheet with substrate according to any one of claims 1 to 7, wherein the substrate layer is made of a material selected from polyethylene terephthalate and polycarbonate.
9. The carbon tape printable retroreflective sheeting of any one of claims 1-8 wherein the retroreflective sheeting is directly printed on a carbon tape printer without a film.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111582225.9A CN116338841A (en) | 2021-12-22 | 2021-12-22 | Retroreflective sheet with base material and capable of being printed by carbon tape |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111582225.9A CN116338841A (en) | 2021-12-22 | 2021-12-22 | Retroreflective sheet with base material and capable of being printed by carbon tape |
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| CN116338841A true CN116338841A (en) | 2023-06-27 |
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| CN202111582225.9A Pending CN116338841A (en) | 2021-12-22 | 2021-12-22 | Retroreflective sheet with base material and capable of being printed by carbon tape |
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| CN (1) | CN116338841A (en) |
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