A label film for automobile sunshade surface and preparation method thereof

Abstract

The embodiment of the present invention discloses a label film for the surface of a car sunshade and a preparation method thereof, comprising a first combination layer and a second combination layer connected in sequence; and the first combination layer at least comprises an adhesive layer adhered to the surface of the car sunshade and a deformable soft paste layer arranged on the adhesive layer; the second combination layer at least comprises a marking layer, and a slow-release adhesive layer group arranged between the soft paste layer and the marking layer, and the slow-release adhesive layer group comprises at least a thermal conductive material. The preparation method comprises: S100, compounding an adhesive layer on the soft paste layer to obtain a first combination layer; S200, laminating the marking layer on the slow-release adhesive layer group to form a second combination layer; S300, laminating one side of the soft paste layer facing away from the adhesive layer with one side of the slow-release adhesive layer group facing away from the marking layer to obtain a label film for the surface of a car sunshade. The effects of good environmental protection, good adhesion effect, and excellent high temperature resistance are achieved, and the marking effect is increased.

Description

Technical Field

[0001] The embodiment of the present invention relates to the technical field of structure and material of a label film for a car sun visor surface, and in particular to a label film for a car sun visor surface and a preparation method thereof. Background Art

[0002] Sun visor refers to the general term for plate-like components (main body) and mounting components (including shock-absorbing components) that are installed to block the glare that enters the driver's (including co-pilot or passenger) eyes. It is installed on the crossbeam of the car windshield frame. It has the characteristics of flexible, smooth and noiseless operation and can stop at any position.

[0003] Its structure and materials often have the following types: 1. The visor body of general domestic models uses metal frame + PU foam + cardboard as the skeleton, and is wrapped with PVC skin, or metal frame + PP blow molding, and then wrapped with PVC skin. This type of visor has a poor feel and obvious skin shrinkage. 2. The visor body of mid-to-high-end models uses PP injection molding skeleton, PVC skin or knitted fabric skin wrapping. This type of visor has a good feel, is more environmentally friendly, and the material is recyclable and the skin is basically non-shrinking.

[0004] Regardless of the type of sunshade, a warning label needs to be posted on its surface to provide safety information for passengers. The labels currently used in the prior art mostly use pressure-sensitive glue to directly paste the marking layer, which not only has a low bonding strength, but is also mostly formed by solvent coating, which is easy to cause environmental pollution during the production process. In addition, for sunshades with uneven surfaces, it is more likely to fall off during the pasting process. Another type of label generally uses thermal transfer to transfer warning information to the sunshade, and its surface is easily damaged and scratched, and it is also easy to fall off and fade under sunlight, so it also has many problems during long-term use. Summary of the invention

[0005] To this end, an embodiment of the present invention provides a label film for the surface of a car visor and a preparation method thereof, which adopts a laminated arrangement of an adhesive layer, a deformable soft sticker layer, a slow-release adhesive layer group and a marking layer, thereby substantially avoiding the use of volatile organic compounds and improving environmental protection. At the same time, the multi-layer laminated arrangement can further improve the texture of the hot pressing on the visor by deformation while improving the properties such as light stability and high temperature resistance, and further improve the bonding strength by improving the fit, thereby further increasing the marking effect, so as to solve the problem that the pressure-sensitive label material solution in the prior art has limited room for improvement and unsatisfactory effect, especially the problem of easy falling off after being used for a period of time.

[0006] In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

[0007] In one aspect of an embodiment of the present invention, a label film for a surface of a car sunshade is provided, comprising a first combined layer and a second combined layer connected in sequence; and

[0008] The first combined layer at least comprises an adhesive layer adhered to the surface of the automobile sunshade and a deformable soft adhesive layer disposed on the adhesive layer;

[0009] The second combined layer at least includes a marking layer and a slow-release adhesive layer group disposed between the soft adhesive layer and the marking layer, and the slow-release adhesive layer group at least includes a heat-conducting material.

[0010] As a preferred solution of the present invention, the slow-release adhesive layer group at least includes a slow-release layer and a protective layer sequentially arranged from the soft adhesive layer to the marking layer.

[0011] As a preferred embodiment of the present invention, the thickness of the first combined layer is d A , the thickness of the second combined layer is d B , K = d A / d B , and 0.25≤K≤2.5.

[0012] As a preferred embodiment of the present invention, the melting point of the soft adhesive layer is T m2 , the melting point of the sustained-release layer is T m3 , the melting point of the protective layer is T m4 , let Σ1=T m3 -T m2 ,Σ2=T m4 -T m3 , then 0℃≤Σ1≤35℃, 10℃≤Σ2≤70℃.

[0013] As a preferred embodiment of the present invention, the thickness of the adhesive layer is 1-20 μm;

[0014] The thickness of the soft paste layer is 10-50 μm;

[0015] The thickness of the sustained-release layer is 10-50 μm;

[0016] The thickness of the protective layer is 5-50 μm;

[0017] The thickness of the marking layer is 0.5-3 μm.

[0018] As a preferred embodiment of the present invention, the thickness of the adhesive layer is 5-15 μm;

[0019] The thickness of the soft paste layer is 15-35 μm;

[0020] The thickness of the sustained-release layer is 15-45 μm;

[0021] The thickness of the protective layer is 10-45 μm.

[0022] As a preferred solution of the present invention, the material of the adhesive layer is selected from hot melt adhesive and / or heat activated adhesive, and the bonding strength is not less than 20 N / inch.

[0023] In another aspect of the embodiment of the present invention, there is also provided a method for preparing the label film for the surface of the automobile sunshade according to the above-mentioned method, comprising:

[0024] S100, compounding an adhesive layer on the soft pasting layer to obtain a first combined layer;

[0025] S200, laminating the marking layer onto the slow-release adhesive layer group to form a second combined layer;

[0026] S300, laminating the side of the soft adhesive layer facing away from the adhesive layer and the side of the slow-release adhesive layer group facing away from the marking layer to obtain a label film for the surface of a car sun visor.

[0027] As a preferred embodiment of the present invention, the sustained-release adhesive layer group includes a sustained-release layer and a protective layer, and step S200 specifically includes: laminating the marking layer to one side of the protective layer, laminating the sustained-release layer to the side of the protective layer opposite to the marking layer, to form a second combined layer.

[0028] As a preferred embodiment of the present invention, the adhesive layer is prepared by using a hot melt adhesive and / or a heat activated adhesive by at least one of roller coating, gravure coating, dipping, reverse coating, spray coating and spin coating;

[0029] The soft adhesive layer is in the form of a film and is made of at least one of polyethylene resin, styrene resin, polypropylene resin, thermoplastic polyurethane resin, polyvinyl chloride resin, rosin tackifying resin, C5 / C9 petroleum resin, terpene resin, ethylene-octene copolymer, propylene-octene copolymer and ethylene-butadiene-propylene copolymer by at least one method of extruder casting method, film blowing method and multi-layer co-extrusion method;

[0030] The sustained-release layer is made of at least one of polyethylene resin, polypropylene resin and thermoplastic polyurethane resin;

[0031] The protective layer is in the form of a film and includes at least one of polyester resin, polyolefin resin, polyphenolic resin, polyamide resin, polymethacrylate resin, polycarbonate resin, ABS resin, polyimide resin and polytetrafluoroethylene resin, and an inorganic filler.

[0032] The embodiments of the present invention have the following advantages:

[0033] 1) By setting the adhesive layer, the label film can be attached to the visor body by hot pressing during the later use, so as to achieve the effect of high bonding strength; 2) The composite setting of the first combination layer and the second combination layer, combined with the setting of the slow-release adhesive layer group including the thermal conductive material, makes the whole have good stability, and its bonding strength and other performances do not decrease significantly under normal temperature and high temperature conditions; 3) The slow-release adhesive layer group is buffered and set between the marking layer and the first combination layer, so as to further improve the adhesion of the ink on the marking layer, and improve the light resistance stability to avoid fading; 4) No volatile organic solvents are produced during the production and use process, which is more environmentally friendly; 5) The label edge is neat, the texture is obvious after hot pressing, and the marking effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0035] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0036] Figure 1 A schematic diagram of the structure of a label film for the surface of a car sunshade provided by an embodiment of the present invention;

[0037] Figure 2 The present invention is a flowchart of a method for preparing a label film for a vehicle sun visor surface provided by an embodiment of the present invention.

[0038] In the figure:

[0039] 1-first combined layer; 2-second combined layer;

[0040] 11-adhesive layer; 12-soft pasting layer;

[0041] 21- sustained-release layer; 22- protective layer; 23- labeling layer. DETAILED DESCRIPTION

[0042] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] like Figure 1 As shown, the present invention provides a label film for the surface of a car sunshade, comprising a first combined layer 1 and a second combined layer 2 which are sequentially connected; and

[0044] The first combined layer 1 at least comprises an adhesive layer 11 adhered to the surface of the automobile sun visor and a deformable soft adhesive layer 12 disposed on the adhesive layer 11;

[0045] The second combined layer 2 at least includes a marking layer 23 and a slow-release adhesive layer group disposed between the soft adhesive layer 12 and the marking layer 23 , and the slow-release adhesive layer group at least includes a heat-conducting material.

[0046] Of course, the label film here can be formed into a sheet, can be rolled into a roll, or can be wound into a disc, which can be designed according to the process of the application label system.

[0047] In a further preferred embodiment, in order to further improve the buffering performance of the sustained-release adhesive group between the soft adhesive layer 12 and the marking layer 23, the sustained-release adhesive layer group includes at least a sustained-release layer 21 and a protective layer 22 sequentially arranged from the soft adhesive layer 12 to the marking layer 23.

[0048] In a preferred embodiment of the present invention, the thickness of the first combined layer 1 is d A , the thickness of the second combined layer 2 is d B , K = d A / d B , and 0.25≤K≤2.5, by setting the value of K between 0.25 and 2.5, the first composite layer 1 and the second composite layer 2 can provide a strong adhesive force during the bonding process, while avoiding the problem of glue overflow around the periphery. Of course, it should be noted that the thickness measurement here is the result obtained by measuring under standard conditions, for example, under normal circumstances, it is measured at a temperature of 23°C and a relative humidity of 50%.

[0049] In a further preferred embodiment, the melting point of the soft adhesive layer 12 is T m2 , the melting point of the sustained-release layer 21 is T m3 , the melting point of the protective layer 22 is T m4 , let Σ1=Tm3 -T m2 ,Σ2=T m4 -T m3 , then 0℃≤Σ1≤35℃, 10℃≤Σ2≤70℃. By limiting this temperature, when the label film is heat-sealed on the shading plate, the texture structure of the shading plate surface can be displayed, so that the label film and the shading plate form an integrated marking effect, and the bonding firmness and bonding strength can be further improved.

[0050] like Figure 2 As shown, the present invention also provides a method for preparing the label film for the surface of the automobile sunshade according to the above-mentioned method, comprising:

[0051] S100, compounding the adhesive layer 11 on the soft pasting layer 12 to obtain a first combined layer 1;

[0052] S200, laminating the marking layer 23 onto the slow-release adhesive layer group to form a second combined layer 2;

[0053] S300, laminating the side of the soft adhesive layer 12 facing away from the adhesive layer 11 and the side of the slow-release adhesive layer group facing away from the marking layer 23 to obtain a label film for the surface of a car sunshade.

[0054] Of course, it should be noted that "lamination" here refers to the process of bonding two parts together, which can be done using an adhesive or by combining them based on their own adhesive properties, either at room temperature or in a molten state.

[0055] In a preferred embodiment, step S200 specifically includes: laminating the marking layer 23 to one side of the protective layer 22 , laminating the sustained-release layer 21 to the side of the protective layer 22 facing away from the marking layer 23 , to form a second combined layer 2 .

[0056] The material, function and preparation method of each layer structure are further described in detail below.

[0057] Adhesive layer 11: The adhesive layer 11 is in direct contact with the object to be adhered and provides a strong heat-sealing strength. The material of the adhesive layer 11 should have a bonding strength of not less than 20N / inch.

[0058] Specifically, in some embodiments, the adhesive layer 11 is a hot melt adhesive or a heat activated adhesive. For example, the hot melt adhesive can be selected from ethylene-vinyl acetate polymer (EVA), ethylene-methyl acrylate copolymer (EMA), ethylene-acrylic acid copolymer (EAA), propylene-styrene (SEPS), modified polyethylene (LDPE), polyamide resin, polyurethane resin, etc. In some other embodiments, the adhesive layer 11 can also be a thermoplastic dispersion, for example, a single material such as acrylate, polyurethane, polyolefin, polyester, etc., or a combination of the above materials, etc.

[0059] In the preparation process of the adhesive layer 11, the above resin is allowed to be fully solid or partially solid during the construction process. In order to make the production smoother, the present embodiment takes partial solid as an example. For example, partial solid can use water as a diluent, which can be achieved by the following methods: roller coating, gravure coating, dipping, reverse coating, spraying, spin coating, etc. The thickness of the adhesive layer 11 is generally set at 1-20μm, more preferably 3-17μm, and more preferably 5-15μm.

[0060] Soft paste layer 12: The material of the soft paste layer 12 is a relatively soft and smooth material. This layer of material needs to be easily embedded in the surface texture of the shading plate during hot pressing, so that the entire label film surface reflects the texture effect. As the material of the above-mentioned soft paste layer 12, one or more combinations of polyethylene resin, styrene resin, polypropylene resin, thermoplastic polyurethane resin, polyvinyl chloride resin, rosin tackifying resin, C5 / C9 petroleum resin, terpene resin, ethylene-octene copolymer, propylene-octene copolymer, ethylene-butadiene-propylene copolymer, etc. can be selected. From the perspective of improving the penetration effect and enhancing the bonding effect, a blended resin of polyethylene, ethylene-octene copolymer, and rosin tackifying resin can be further selected. The material of the above-mentioned soft paste layer 12 can be a single-layer film of the above-mentioned material. As the form of the film, it can be stretched or in the initial state. Its production process can be extruder casting, film blowing, or multi-layer co-extrusion. The thickness is generally set to 10-50μm, and more preferably 15-35μm.

[0061] The sustained-release layer 21 exists between the protective layer 22 and the soft-sticking layer 12, and plays the role of transferring heat, buffering the heat-sealing pressure, and stabilizing the label size, thereby avoiding the shrinkage of the entire label film during the high-temperature heat-sealing process, the overflow of the adhesive layer, and other problems. As the material of the sustained-release layer 21, preferably, it can be specifically selected from one or a combination of polyethylene resin, polypropylene resin, thermoplastic polyurethane resin, etc., and further can use a density of 0.91-0.98g / cm 3, a mixture of one or more of linear low-density polyethylene LLDPE, low-density polyethylene LDPE and polypropylene with a MI of 0.1-20 g / 10 min. The thickness of the sustained-release layer 21 is generally set to 10-50 μm, and more preferably 15-45 μm.

[0062] Protective layer 22: The material constituting the protective layer 22 needs to have the performance of attaching the marking layer 23 on at least one side, and the protective layer 22 itself can provide a certain mechanical strength to protect and cope with the heating and pressurizing conditions in the subsequent mounting process, so that the entire label film and the shading plate are integrated. Therefore, preferably, the material constituting the protective layer 22 has a certain heat resistance and a certain mechanical strength. The form of the material constituting the protective layer is not particularly limited. From the perspective of the most commonly used flexible materials, it can be a film. Specifically, the material of the protective layer 22 can be selected from polyester resins, polyolefin resins, polyphenolic resins, polyamide resins, polymethacrylate resins, polycarbonate resins, ABS resins, polyimide resins, polytetrafluoroethylene resins and inorganic fillers such as barium dioxide, titanium dioxide, and silicon dioxide. Modified polyester materials or polyolefin blended materials are preferred.

[0063] Marking layer 23: In a preferred embodiment, the marking layer is a two-component or multi-component material, and a cross-linkable and curable resin. For example, as a preferred embodiment, it can be specifically selected as a combination of acrylates and polyurethanes, and colored inorganic fillers can be added according to the situation. Cross-linking can be achieved by any method known in the art, for example, it can include curing by using light radiation. In the case of photochemically induced cross-linking, the process can be assisted by the use of photoinitiators and other known catalysts. In other embodiments, cross-linking occurs by thermal curing or by a combination of any different cross-linking methods disclosed herein and known in the art. The above resins are allowed to be fully solid or partially solid during the construction process. And it can be achieved by roller coating, lithography, gravure printing, screen printing, digital inkjet printing, digital transfer, flexographic printing, letterpress printing and other methods. The thickness of the marking layer can be set to 0.5-3μm.

[0064] The following is further described by means of specific examples.

[0065] The material of the adhesive layer 11 is selected as follows:

[0066] Thermoplastic polyurethane resin manufactured by BASF, Germany (denoted as 1-1), with a thickness of 2 μm;

[0067] Thermoplastic polyolefin dispersion manufactured by Mitsubishi, Japan (denoted as 1-2), with a thickness of 3 μm;

[0068] The material of the soft paste layer 12 is selected as follows:

[0069] A polyolefin blend (LLDPE / POE, denoted as 2-1) manufactured by ExxonMobil with a thickness of 20 μm;

[0070] Dongguan Xionglin manufactured thermoplastic polyurethane film (denoted as 2-2) with a thickness of 25 μm;

[0071] A polyolefin mixture (denoted as 2-3) obtained by mixing LDPE manufactured by Dow Chemical, terpene resin manufactured by Japan YASUHARA Chemical, and C9 petroleum resin manufactured by EASTMAN, with a thickness of 20 μm;

[0072] The material of the sustained-release layer 21 is selected as follows:

[0073] ExxonMobil's LLDPE polyolefin resin (denoted as 3-1), with a thickness of 25 μm;

[0074] A polyolefin resin mixture (denoted as 3-2) obtained by mixing a PP modified resin manufactured by Mitsui Chemicals and a LDPE modified resin manufactured by Arkema, with a thickness of 25 μm;

[0075] The material of the protective layer 22 is selected as follows:

[0076] White PET / PETG blended film (denoted as 4-1) manufactured by Toyobo, Japan, with a thickness of 36 μm;

[0077] White PP / PE blend film (denoted as 4-2) manufactured by Kotobukatsu, Japan, with a thickness of 40 μm;

[0078] The marking layer was a black UV cross-linked acrylic resin (denoted as 5-1) with a thickness of 1 μm manufactured by Toyo Ink.

[0079] Example 1-Example 5

[0080] The material type of each layer, the thickness of the first combined layer, the thickness of the second combined layer, the K value, T m2 、T m3 、T m4 , Σ1, Σ2 are shown in Table 1.

[0081] Table 1

[0082]

[0083] Test example

[0084] The above-mentioned Examples 1 to 5 were attached to a shading plate wrapped with a PVC skin in a heat sealer at 140-200°C, and their light transmittance, glossiness, peel adhesion and peel adhesion after being placed under high temperature and high humidity conditions for 1000 hours were tested respectively. The results are shown in Table 2.

[0085] Table 2

[0086]

[0087] It can be seen from Table 2 that the label film obtained by the present invention has a bonding strength greater than 20N / inch, an overall light transmittance ≤20%, and a glossiness ≤15GU; after being mounted on a shading plate, the peel strength decreases by no more than 1% when placed at room temperature for 2 years, and the peel strength decreases by no more than 5% when placed under high temperature aging conditions (60°C, relative humidity 90%) for 1000 hours.

[0088] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A label film for the surface of a car sunshade, characterized in that: It comprises a first combined layer (1) and a second combined layer (2) which are connected in sequence; and, The first combined layer (1) at least comprises an adhesive layer (11) adhered to the surface of the automobile sunshade and a deformable soft adhesive layer (12) arranged on the adhesive layer (11); The second combined layer (2) comprises at least a marking layer (23), and a slow-release adhesive layer group arranged between the soft adhesive layer (12) and the marking layer (23), and the slow-release adhesive layer group comprises at least a heat-conducting material; The slow-release adhesive layer group at least comprises a slow-release layer (21) and a protective layer (22) which are arranged in sequence from the soft adhesive layer (12) to the marking layer (23); The thickness of the first combined layer (1) is d A , the thickness of the second combined layer (2) is d B , K = d A / d B , and 0.25≤K≤2.5; The melting point of the soft adhesive layer (12) is T m2 The melting point of the sustained-release layer (21) is T m3 The melting point of the protective layer (22) is T m4 , let Σ1=T m3 -T m2 ,Σ2=T m4 -T m3 , then 0℃≤Σ1≤35℃, 10℃≤Σ2≤70℃.

2. The label film for the surface of a car sunshade according to claim 1, characterized in that: The thickness of the adhesive layer (11) is 1-20 μm; The thickness of the soft adhesive layer (12) is 10-50 μm; The sustained-release layer (21) has a thickness of 10-50 μm; The thickness of the protective layer (22) is 5-50 μm; The thickness of the marking layer (23) is 0.5-3 μm.

3. The label film for the surface of a car sunshade according to claim 2, characterized in that: The thickness of the adhesive layer (11) is 5-15 μm; The thickness of the soft adhesive layer (12) is 15-35 μm; The sustained-release layer (21) has a thickness of 15-45 μm; The thickness of the protective layer (22) is 10-45 μm.

4. The label film for the surface of a car sunshade according to claim 1, characterized in that: The material of the adhesive layer (11) is selected from hot melt adhesive and / or heat activated adhesive, and the bonding strength is not less than 20N / inch.

5. A method for preparing a label film for the surface of a car sunshade according to any one of claims 1 to 4, characterized in that: include: S100, compounding an adhesive layer (11) on a soft adhesive layer (12) to obtain a first combined layer (1); S200, laminating the marking layer (23) onto the slow-release adhesive layer group to form a second combined layer (2); S300, laminating the side of the soft adhesive layer (12) facing away from the adhesive layer (11) and the side of the slow-release adhesive layer group facing away from the marking layer (23) to obtain a label film for the surface of a car sun visor.

6. The method for preparing a label film for the surface of a car sunshade according to claim 5, characterized in that: The sustained-release adhesive layer group comprises a sustained-release layer (21) and a protective layer (22), and step S200 specifically comprises: laminating the marking layer (23) onto one side of the protective layer (22), and laminating the sustained-release layer (21) onto the side of the protective layer (22) opposite to the side on which the marking layer (23) is laminated, to form a second combined layer (2).

7. The method for preparing a label film for the surface of a car sunshade according to claim 6, characterized in that: The adhesive layer (11) is made of a hot melt adhesive and / or a heat activated adhesive by at least one of a roller coating method, a gravure coating method, a dipping method, a reverse coating method, a spray coating method and a spin coating method; The soft adhesive layer (12) is in the form of a film and is made of at least one of polyethylene resin, styrene resin, polypropylene resin, thermoplastic polyurethane resin, polyvinyl chloride resin, rosin tackifying resin, C5 / C9 petroleum resin, terpene resin, ethylene-octene copolymer, propylene-octene copolymer and ethylene-butadiene-propylene copolymer by at least one of an extruder casting method, a film blowing method and a multi-layer co-extrusion method; The sustained-release layer (21) is made of at least one of polyethylene resin, polypropylene resin and thermoplastic polyurethane resin; The protective layer (22) is in the form of a film and comprises at least one of polyester resin, polyolefin resin, polyphenolic resin, polyamide resin, polymethacrylate resin, polycarbonate resin, ABS resin, polyimide resin and polytetrafluoroethylene resin, and an inorganic filler.

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