Strippable transfer membrane for OMD decoration process and preparation method and application of strippable transfer membrane

Abstract

The invention belongs to the technical field of surface decoration processes, and particularly relates to a peelable transfer membrane for an OMD decoration process and a preparation method and application of the peelable transfer membrane. The strippable transfer membrane comprises a base membrane, a release layer, a hardened layer, a pattern color layer, a glue layer and a protective membrane which are sequentially arranged, the diaphragm is transferred to an injection molding part under the vacuum pressure difference laminating process condition, and the overall thickness is within 50 microns. For industries such as mobile phones, notebook computers and the like which are relatively precise in assembly structure and strict in size requirement, the OMD (Out Molded Decoration) decoration process can use the diaphragm to realize the appearance effect, and traditional processes such as spraying and in-mold decoration processes can be replaced. Compared with an IMD process, the cost can be reduced, and compared with spraying, rich patterns / textures can be made, and VOC emission can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of surface decoration technology, and in particular relates to a peelable transfer film for OMD decoration technology and a preparation method and application thereof. Background Art

[0002] Compared with the IMD process (in-mold decoration process), the OMD (OutMold Decoration) decoration process does not require slitting jigs, stamping jigs, and injection molding jigs, and has the obvious advantages of low mold opening costs and short proofing cycles. The application of the OMD (OutMold Decoration) decoration process is currently in its infancy, and there is great room for growth in the future. There are not many types of diaphragms available for the OMD (OutMold Decoration) decoration process, including PVC\PC\PET\ABS and other different types of diaphragms. However, these diaphragms are generally thicker, with a thickness of about 0.2-0.5um, and cannot be thinner. This has great limitations for industries with more precise assembly structures and strict dimensional requirements, because the thickness of the diaphragm will affect the assembly and appearance of the workpiece.

[0003] There are not many types of films available for OMD (Out Mold Decoration) decoration process, including PVC\PC\PET\ABS, etc. However, these films are generally thicker, about 0.2-0.5um thick, and cannot be thinner. This has great limitations for industries with precise assembly structures and strict dimensional requirements, because the thickness of the film will affect the assembly and appearance of the workpiece. Summary of the invention

[0004] This technology makes the hardening layer and color pattern effect layer on the base film of ABS / PET / CPP / PVC / OPP / PO coated with release agent. After the vacuum pressure difference laminating process, the hardening layer and color effect layer are separated from the base film and transferred to the injection molded workpiece. The overall thickness of the hardening layer and color pattern effect layer will not exceed 50μm, which can achieve different color effects and good surface wear resistance. This will not affect the assembly and appearance of precision workpieces. Compared with spraying, it has the environmental advantages of achieving different texture pattern effects and reducing VOC (volatile organic compound) emissions.

[0005] In order to solve the above-mentioned technical problems, this application provides the following technical solutions:

[0006] The present invention provides a peelable transfer film for OMD decoration process, comprising a base film, a release layer, a hardening layer, a pattern color layer, a glue layer and a protective film arranged in sequence;

[0007] The base film is selected from ABS (a terpolymer of acrylonitrile, butadiene and styrene) film, polyethylene terephthalate (PET) film, chlorinated polypropylene (CPP) film, polyvinyl chloride (PVC) film, stretch polypropylene (OPP) film or polyolefin (PO) film; the hardened layer is obtained by baking varnish or irradiating it with UV energy; the total thickness of the hardened layer and the pattern color layer is not more than 50 μm.

[0008] The glue is hot melt glue, model is Kanglibang KL-18.

[0009] The varnish was purchased from Wuxi Tuohui, model number is H0013.

[0010] Preferably, the thickness of the PVC film is 0.2-0.5 μm.

[0011] Preferably, the thickness of the PO membrane is 0.1-0.3 μm.

[0012] Preferably, the varnish is selected from UV varnish and PU varnish.

[0013] Furthermore, the hardened layer is made of UV varnish at 400-1500mJ / cm 2 The method of UV energy irradiation is obtained.

[0014] Furthermore, the hardened layer is obtained by baking PU varnish at 60-80° C. for 5-30 minutes.

[0015] Preferably, a varnish treatment agent layer is further provided between the hardening layer and the pattern color layer.

[0016] Furthermore, a treatment agent layer is further included between the base film and the release layer; and the release layer is a textured release layer.

[0017] The present invention also provides a method for preparing the above-mentioned peelable transfer film for OMD decoration process, comprising the following steps:

[0018] S11: After coating the release agent on the base film, bake at 60-80° C. for 5-30 minutes to form a release layer;

[0019] S12: coating varnish on the surface of the release layer, and obtaining a hardened layer by baking or UV energy irradiation;

[0020] S13: printing a pattern color layer on the surface of the hardened layer, and baking at 60-80° C. for 5-30 minutes;

[0021] S14: coating glue on the surface of the pattern color layer, and baking at 60-80° C. for 5-30 minutes to form a glue layer;

[0022] S15: laminating a protective film on the surface of the glue layer to obtain the peelable transfer film for the OMD decoration process.

[0023] The present invention also provides an application of the above-mentioned peelable transfer film in an out-of-mold decoration process, comprising the following steps:

[0024] S21: peeling off the protective film in the peelable transfer film;

[0025] S22: The surface of one side of the peelable transfer film coated with glue after the protective film is torn off in step S21 is adhered to the surface of the workpiece through differential pressure molding, and then the base film and the release layer are torn off to complete the application of the peelable transfer film in the off-mold decoration process; the differential pressure molding adopts a vacuum differential pressure laminating machine, and the pressure of the differential pressure molding is 0.1-0.4atm.

[0026] The technical solution of the present invention has the following advantages over the prior art:

[0027] The diaphragm is transferred to the injection molded part under vacuum pressure differential laminating process, and the overall thickness is within 50um. For industries with relatively precise assembly structures and strict dimensional requirements such as mobile phones and laptops, the OMD (Out Mold Decoration) decoration process can use this diaphragm to achieve the appearance effect, replacing traditional processes such as spraying and IMD (in mold decoration process). Compared with the IMD process, it can reduce costs, and compared with spraying, it can make rich patterns / textures and reduce VOC emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the product in the out-of-mold decoration process of the present invention.

[0029] Figure 2 It is the appearance of the product after the peelable transfer film is applied to the out-of-mold decoration process.

[0030] Figure 3 It is the appearance of the product after the peelable transfer film is attached to the workpiece using the out-of-mold decoration process.

[0031] Explanation of the reference numerals: 1-base film, 2-release layer, 3-hardening layer, 4-pattern color layer, 5-glue layer, 6-protective film, 7-varnish treatment agent layer, 8-treatment agent layer, 9-texture release layer. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0033] Example 1

[0034] This embodiment provides a peelable transfer film for OMD decoration process, which is composed of a base film 1, a release layer 2, a hardening layer 3, a pattern color layer 4, a glue layer 5 and a protective film 6 arranged in sequence. Figure 1 As shown in A; the base film 1 is selected from a transparent PVC film; the hardened layer 3 is obtained by baking PU varnish; the total thickness of the hardened layer 3 and the pattern color layer 4 is not more than 50μm.

[0035] The steps for preparing the peelable transfer film of this embodiment are as follows:

[0036] Step 1: Select a transparent PVC film with a thickness of 0.3 μm;

[0037] Step 2: Apply a release agent on the PVC film and bake it at 70°C for 20 minutes to form a release layer 2;

[0038] Step 3: Apply PU varnish on the release layer 2 and bake at 70°C for 20 minutes to form a hardened layer 3;

[0039] Step 4: Print the pattern color, and bake at 70°C for 20 minutes to form the pattern color layer 4;

[0040] Step 5: Apply hot melt glue Kanglibang KL-18 and bake at 70℃ / 20 minutes to form glue layer 5;

[0041] Step 6: Laminating the protective film 6 on the surface of the glue layer 5 .

[0042] Example 2

[0043] The present embodiment provides a peelable transfer film for OMD decoration process, which is composed of a base film 1, a release layer 2, a hardening layer 3, a varnish treatment agent layer 7, a pattern color layer 4, a glue layer 5 and a protective film 6 arranged in sequence. Figure 1 As shown in B; the base film 1 is selected from a transparent PVC film; the hardened layer 3 is obtained by UV varnish through UV energy irradiation; the total thickness of the hardened layer 3 and the pattern color layer 4 is not more than 50μm.

[0044] The steps for preparing the peelable transfer film of this embodiment are as follows:

[0045] Step 1: Select a transparent PVC film with a thickness of 0.3 μm;

[0046] Step 2: Apply a release agent on the PVC film and bake it at 70°C for 20 minutes to form a release layer 2;

[0047] Step 3: Apply H0013UV varnish on the release layer and 2 UV energy irradiation to form a hardened layer 3;

[0048] Step 4: Apply a layer of varnish, and bake at 70°C for 20 minutes to form a varnish treatment agent layer 7;

[0049] Step 5: Printing pattern color, and baking at 70°C / 20 minutes to form pattern color layer 4;

[0050] Step 6: Apply hot melt glue Kanglibang KL-18 glue, and bake at 70℃ / 20 minutes to form a glue layer 5;

[0051] Step 7: Laminating the protective film 6 on the surface of the glue layer 5 .

[0052] Example 3

[0053] The present embodiment provides a peelable transfer film for OMD decoration process, which is composed of a base film 1, a treatment agent layer 8, a texture release layer 9, a hardening layer 3, a varnish treatment agent layer 7, a pattern color layer 4, a glue layer 5 and a protective film 6 arranged in sequence. Figure 1 As shown in C; the base film 1 is selected from a transparent PVC film; the hardened layer 3 is obtained by UV varnish through UV energy irradiation; the total thickness of the hardened layer 3 and the pattern color layer 4 is not more than 50μm.

[0054] Step 1: Select a PO film with a thickness of 0.15 μm as the base film 1;

[0055] Step 2: coating a treatment agent on the PO film, and baking at 70°C for 20 minutes to form a treatment agent layer 8;

[0056] Step 3: Apply UV varnish on the treatment agent and 1000mJ / cm 2 UV energy irradiation to form a textured release layer 9;

[0057] Step 4: Apply Wuxi Tuohui H0013UV varnish on the texture release layer and irradiate it with 1000mJ / cm 2 UV energy irradiation to form a hardened layer 3;

[0058] Step 5: Apply a layer of varnish, and bake at 70°C for 20 minutes to form a varnish treatment agent layer 7;

[0059] Step 6: Printing pattern color, and baking at 70°C / 20 minutes to form pattern color layer 4;

[0060] Step 7: Apply hot melt glue Kanglibang KL-18 glue, and bake at 70℃ / 20 minutes to form a glue layer 5;

[0061] Step 8: Laminating the protective film 6 on the surface of the glue layer 5 .

[0062] Example 4

[0063] The present embodiment provides a peelable transfer film for OMD decoration process, which is composed of a base film 1, a treatment agent layer 8, a texture release layer 9, a hardening layer 3, a varnish treatment agent layer 7, a pattern color layer 4, a glue layer 5 and a protective film 6 arranged in sequence. Figure 1 As shown in C; the base film 1 is selected from a transparent PO film; the hardened layer 3 is obtained by UV varnish through UV energy irradiation; the total thickness of the hardened layer 3 and the pattern color layer 4 is not more than 50μm.

[0064] Step 1: Select a PO film with a thickness of 0.2 μm as the base film 1;

[0065] Step 2: coating a treatment agent on the PO film, and baking at 60°C for 5 minutes to form a treatment agent layer 8;

[0066] Step 3: Apply UV varnish on the treatment agent and emboss it with 400mJ / cm 2 UV energy irradiation to form a textured release layer 9;

[0067] Step 4: Apply Wuxi Tuohui H0013UV varnish on the texture release layer and 400mJ / cm 2 UV energy irradiation to form a hardened layer 3;

[0068] Step 5: Apply a layer of varnish, and bake at 60°C for 5 minutes to form a varnish treatment agent layer 7;

[0069] Step 6: Print the pattern color, and bake at 60°C for 5 minutes to form the pattern color layer 4;

[0070] Step 7: Apply hot melt glue Kanglibang KL-18 glue, and bake at 60℃ / 5 minutes to form glue layer 5;

[0071] Step 8: Laminating the protective film 6 on the surface of the glue layer 5 .

[0072] Example 5

[0073] The present embodiment provides a peelable transfer film for OMD decoration process, which is composed of a base film 1, a treatment agent layer 8, a texture release layer 9, a hardening layer 3, a varnish treatment agent layer 7, a pattern color layer 4, a glue layer 5 and a protective film 6 arranged in sequence. Figure 1 As shown in C; the base film 1 is selected from a transparent PVC film; the hardened layer 3 is obtained by UV varnish through UV energy irradiation; the total thickness of the hardened layer 3 and the pattern color layer 4 is not more than 50μm.

[0074] Step 1: Select a PVC film with a thickness of 0.3 μm as the base film 1;

[0075] Step 2: coating a treatment agent on the PVC film, and baking at 80°C for 30 minutes to form a treatment agent layer 8;

[0076] Step 3: Apply UV varnish on the treatment agent and emboss it with 1500mJ / cm 2 UV energy irradiation to form a textured release layer 9;

[0077] Step 4: Apply Wuxi Tuohui H0013UV varnish on the texture release layer and irradiate it with 1500mJ / cm 2 UV energy irradiation to form a hardened layer 3;

[0078] Step 5: Apply a layer of varnish, and bake at 80°C for 30 minutes to form a varnish treatment agent layer 7;

[0079] Step 6: Printing pattern color, and baking at 80°C / 30 minutes to form pattern color layer 4;

[0080] Step 7: Apply hot melt glue Kanglibang KL-18 glue, and bake at 80℃ / 30 minutes to form a glue layer 5;

[0081] Step 8: Laminating the protective film 6 on the surface of the glue layer 5 .

[0082] Application Example 1

[0083] S21: peeling off the protective film 6 in the peelable transfer film described in Example 1;

[0084] S22: The surface of the peelable transfer film 6 peeled off from the protective film 6 in step S21, which is coated with glue, is attached to the surface of the workpiece by differential pressure molding using a vacuum differential pressure laminating machine, and the pressure of the differential pressure molding is 0.2 atm;

[0085] S23: The base film 1 and the release layer 2 are peeled off again to complete this application example.

[0086] Effect evaluation 1

[0087] The present invention includes but is not limited to the above three diaphragm laminated structures (Examples 1 to 3). The diaphragm of laminated structure one (Example 1) / two (Example 2) is torn off from the base film during use, and is torn off from the release layer on the base film under the vacuum pressure difference coating process conditions, and is bonded to the injection molded part through glue, and finally the outermost layer of the injection molded part is the hardened layer of the diaphragm. There is no texture on the surface of the hardened layer of these two structures. The diaphragm of laminated structure three (Example 3) is separated from the textured release layer during use under the vacuum pressure difference coating process conditions, and is bonded to the injection molded part through glue, and finally the outermost layer of the injection molded part is the hardened layer of the diaphragm with texture. After the diaphragm is transferred to the injection molded part, the surface properties of the injection molded part are determined by the hardened layer of the diaphragm.

[0088] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A peelable transfer film for OMD decoration process, characterized in that: It comprises a base film (1), a release layer (2), a hardening layer (3), a pattern color layer (4), a glue layer (5) and a protective film (6) which are arranged in sequence; The base film (1) is selected from ABS film, polyethylene terephthalate film, chlorinated polypropylene film, polyvinyl chloride film, stretchable polypropylene film or polyolefin film; the hardened layer (3) is obtained by baking varnish or irradiating with UV energy; the total thickness of the hardened layer (3) and the pattern color layer (4) is not greater than 50 μm.

2. The peelable transfer film for OMD decoration process according to claim 1, characterized in that: The thickness of the PVC film is 0.2-0.5 μm.

3. The peelable transfer film for OMD decoration process according to claim 1, characterized in that: The thickness of the PO membrane is 0.1-0.3 μm.

4. The peelable transfer film for OMD decoration process according to claim 1, characterized in that: The varnish is selected from UV varnish and PU varnish.

5. The peelable transfer film for OMD decoration process according to claim 4, characterized in that: The hardened layer (3) is made of UV varnish through 400-1500mJ / cm 2 The method of UV energy irradiation is obtained.

6. The peelable transfer film for OMD decoration process according to claim 4, characterized in that: The hardened layer (3) is obtained by baking PU varnish at 60-80° C. for 5-30 minutes.

7. The peelable transfer film for OMD decoration process according to claim 1, characterized in that: A varnish treatment agent layer (7) is also included between the hardening layer (3) and the pattern color layer (4).

8. The peelable transfer film for OMD decoration process according to claim 7, characterized in that: A treatment agent layer (8) is also included between the base film (1) and the release layer (2); the release layer (2) is a textured release layer.

9. A method for preparing a peelable transfer film for OMD decoration process according to any one of claims 1 to 8, characterized in that: The steps include: S11: After coating the release agent on the base film, bake at 60-80° C. for 5-30 minutes to form a release layer; S12: coating varnish on the surface of the release layer, and obtaining a hardened layer by baking or UV energy irradiation; S13: printing a pattern color layer on the surface of the hardened layer, and baking at 60-80° C. for 5-30 minutes; S14: coating glue on the surface of the pattern color layer, and baking at 60-80° C. for 5-30 minutes to form a glue layer; S15: laminating a protective film on the surface of the glue layer to obtain the peelable transfer film for the OMD decoration process.

10. Application of the peelable transfer film according to any one of claims 1 to 8 in an out-of-mold decoration process, characterized in that: The steps include: S21: peeling off the protective film (6) in the peelable transfer film; S22: The surface of the peelable transfer film coated with glue from the protective film (6) torn off in step S21 is adhered to the surface of the workpiece by differential pressure molding, and then the base film (1) and the release layer (2) are torn off to complete the application of the peelable transfer film in the off-mold decoration process; the differential pressure molding adopts a vacuum differential pressure laminating machine, and the pressure of the differential pressure molding is 0.1-0.4atm.

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