Hot-die-casting molded mirror reflecting film for vehicle logo and preparation method of hot-die-casting molded mirror reflecting film

Abstract

The invention discloses a hot die-casting molded mirror reflection film for a vehicle logo and a preparation method of the hot die-casting molded mirror reflection film. A first adhesive transition layer disposed on the base support layer; an intermediate layer disposed on the first adhesive transition layer; an aluminized reflective layer disposed on the intermediate layer; the second bonding transition layer is arranged on the aluminized reflecting layer; the surface layer is arranged on the bonding transition layer; wherein the substrate supporting layer is made of a modified TPU (Thermoplastic Polyurethane) film; the first bonding transition layer and the second bonding transition layer are made of modified acrylate adhesive; the middle layer adopts a PET film or a PC film; and the surface layer adopts a modified PMMA film. The invention has the characteristics of scratch resistance, stable structure, long service life, environment-friendly production process and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of reflective film, in particular, to a hot-pressing molding mirror surface reflective film for vehicle logo and a preparation method thereof. BACKGROUND

[0002] As a core component of vehicle visual identification, the mirror surface decoration effect of vehicle logo directly affects the appearance grade of vehicle. The current common process for vehicle logo mirror surface reflective film is water and electricity plating, vacuum aluminum plating and then composite PET surface layer, but there are obvious defects: The scratch resistance of PET surface layer is insufficient (usually ≤2H), and scratches are easy to appear during long-term use; the substrate of traditional reflective film is mostly hard material, which has low adaptability to the injection molding and hot-pressing molding process commonly used for vehicle logo, and is easy to delaminate and crack during molding.

[0003] PMMA film (polymethyl methacrylate) has excellent transparency, scratch resistance and weather resistance, and TPU film (thermoplastic polyurethane) has good flexibility, tensile strength and high and low temperature resistance, and the combination of the two can balance the mirror surface effect and molding adaptability. However, in the prior art, the surface polarity of TPU is low, the adhesion with the aluminum plating layer is poor; the aluminum plating layer is easy to oxidize, and the interface bonding strength with the PMMA film is insufficient, so there is an urgent need for a composite process and structure design that can solve the above problems. SUMMARY

[0004] Therefore, a first object of the present application is to provide a hot-pressing molding mirror surface reflective film for vehicle logo, which has the characteristics of reasonable structure design.

[0005] In order to achieve the above object, the technical scheme of the present application is: A hot-pressing molding mirror surface reflective film for vehicle logo, comprising: a substrate support layer; a first adhesive transition layer arranged on the substrate support layer; an intermediate layer arranged on the first adhesive transition layer; an aluminum plating reflective layer arranged on the intermediate layer; a second adhesive transition layer arranged on the aluminum plating reflective layer; and a surface layer arranged on the adhesive transition layer; wherein the thickness of the substrate support layer is 0.25mm; the thickness of the intermediate layer is 0.05mm; the thickness of the aluminum plating reflective layer is 80-120nm, the coating thickness of the first and second adhesive transition layers is 3-5μm, and the thickness of the surface layer is 0.2-0.25mm.

[0006] Preferably, the thickness of the base support layer is 0.05mm; the thickness of the aluminized reflection layer is 80-120nm, the coating thickness of the first and second adhesive transition layers is 3-5um, and the thickness of the surface layer is 0.2-0.25mm.

[0007] Preferably, the modified TPU film is added with 1.5-2wt% nano-silica, and the particle size of the nano-silica is 20-30nm.

[0008] Preferably, the modified acrylic adhesive contains 3-5wt% isocyanate curing agent, and the solid content of the adhesive is greater than or equal to 50%.

[0009] Preferably, the modified PMMA film contains 0.3-0.5wt% benzotriazole UV-resistant agent.

[0010] The second object of the present application is to provide a preparation method of a hot-pressing cast mirror surface reflection film for a car logo, wherein the intermediate layer adopts a PC film, and the film has the characteristics of long service life and environmental protection.

[0011] In order to achieve the above-mentioned objects, the technical scheme of the present application is: A preparation method of a hot-pressing cast mirror surface reflection film for a car logo, comprising: S01, fix a 0.05mm PC film on a vacuum evaporation machine tool, set the cooling roll temperature to 18℃, vacuumize to 4*10-3Pa, heat the aluminum wire to 1250℃, control the film coating speed to 1.0nm / s, and form an aluminized reflection layer with a thickness of 100nm on the surface of the PC film; S02, use a comma roller coating machine to coat a modified acrylic adhesive on the surface of a release film with a release force of 15g and a thickness of 0.075mm, and the coating thickness is 10um; then put it into a 65-155℃ oven for pre-curing for 4min; S03, take a UV-resistant modified PMMA film with a thickness of 0.08mm, align it with the release film coated with the adhesive layer, hot-press composite at a pressure of 0.35MPa and a temperature of 85℃ for 12s, peel off the release film, and then align it with the aluminized surface of the aluminized reflection layer, hot-press composite at a pressure of 0.35MPa and a temperature of 85℃ for 12s, to prepare a semi-finished film; S04, take a TPU film with a thickness of 0.25mm, align it with the release film coated with the adhesive layer, hot-press composite at a pressure of 0.35MPa and a temperature of 85℃ for 12s, peel off the release film, and then align it with the PET surface of the semi-finished film, hot-press composite at a pressure of 0.35MPa and a temperature of 85℃ for 12s, to prepare a finished product.

[0012] The third object of the present application is to provide a preparation method of a hot-pressing cast mirror surface reflection film for a car logo, wherein the intermediate layer adopts a PET film, and the film has the characteristics of long service life and environmental protection.

[0013] To achieve the above object, the technical scheme of the present application is: The preparation method of the hot-pressing cast mirror surface reflection film for a car logo comprises the following steps: S11, fix a 0.05mm PET film on a single-color printing machine tool, add 15% aluminum paste ink in a trough, use a 120-mesh gravure roller at a speed of 8m / min, and then put it into a 65-85℃ oven for pre-curing for 4min to form an aluminum-plated reflection layer with a thickness of 100nm on the surface of the PET film.

[0014] S12, use a comma roller coater to coat a modified acrylic adhesive on the surface of a 0.075mm release film with a release force of 15g, with a coating thickness of 10μm; then put it into a 65-155℃ oven for pre-curing for 4min; S13, take a 0.08mm-thick UV-resistant modified PMMA film, align it with the release film coated with the adhesive layer, and hot-press composite at a pressure of 0.35MPa and a temperature of 85℃ for 12s, peel off the release film, and then align and hot-press composite with the aluminum-plated reflection layer at a pressure of 0.35MPa and a temperature of 85℃ for 12s to prepare a semi-finished film; S14, take a 0.25mm-thick TPU film, align it with the release film coated with the adhesive layer, and hot-press composite at a pressure of 0.35MPa and a temperature of 85℃ for 12s, peel off the release film, and then align and hot-press composite with the PET surface of the semi-finished film at a pressure of 0.35MPa and a temperature of 85℃ for 12s to prepare a finished product.

[0015] Preferably, the UV-resistant modified PMMA film contains 0.3-0.5wt% benzotriazole UV-resistant agent.

[0016] Preferably, the modified TPU film is a TPU composite material added with 1.5-2wt% nano-silicon dioxide, and the nano-silicon dioxide has a particle size of 20-30nm.

[0017] Preferably, the modified acrylic adhesive contains 3-5wt% isocyanate curing agent, and the adhesive has a solid content of ≥50%.

[0018] The technical effects of the present application mainly lie in the following aspects: In view of the problems of poor scratch resistance, insufficient weather resistance, and low adaptability to the car logo substrate of the existing car logo mirror surface reflection film, a composite structure is proposed, which takes a TPU film as a substrate support layer and a PMMA film as a surface layer, and is integrally combined through an aluminum-plated reflection layer and a functional transition layer in the middle.

[0019] During preparation, the TPU substrate is first subjected to plasma pretreatment to enhance adhesion. A high-density aluminum reflective layer is formed on the substrate surface using a vacuum evaporation process. Then, it is bonded to a transition layer and laminated with a UV-resistant PMMA surface layer to finally obtain the finished product.

[0020] Aluminum plating using a printing process can achieve similar results to vacuum aluminum plating.

[0021] The finished product of this invention has a mirror gloss of ≥980GU, a scratch resistance rating of 4H, and no delamination or discoloration after high and low temperature cycling tests from -40℃ to 80℃. It is suitable for various automotive labeling and hot pressing processes, and has high production efficiency and is environmentally friendly. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the layer structure of the specular reflective film in the embodiment.

[0023] Reference numerals: 1. Substrate support layer; 2. First adhesive transition layer; 3. Intermediate layer; 4. Aluminum-plated reflective layer; 5. Second adhesive transition layer; 6. Top layer. Detailed Implementation

[0024] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and mastered. Example 1

[0025] This embodiment aims to provide a hot-pressed mirror-reflective film for vehicle logos, such as... Figure 1 As shown, it includes, from bottom to top, a base support layer, a first adhesive transition layer, an intermediate layer, an aluminum-plated reflective layer, a second adhesive transition layer, and a surface layer. Among them, The substrate support layer is a modified TPU film with a thickness of 0.25 mm. The modified TPU film contains 1.5–2 wt% nano-silica with a particle size of 20–30 nm.

[0026] The coating thickness of the first adhesive transition layer and the second adhesive transition layer is 3-5 μm, and a modified acrylate adhesive is selected. The modified acrylate adhesive contains 3-5 wt% isocyanate curing agent, and the solid content of the adhesive is ≥50%.

[0027] The thickness of the aluminum-plated reflective layer is 80–120 nm.

[0028] The middle layer is made of PET or PC film with a thickness of 0.05mm.

[0029] The surface layer is made of modified PMMA film and contains 0.3-0.5 wt% benzotriazole UV inhibitor, with a thickness of 0.2-0.25 mm. Example 2

[0030] The embodiment aims to provide a preparation method of a hot-pressing cast mirror surface reflective film for a car logo, taking a PC film as an intermediate layer, and manufacturing the reflective film in embodiment one. The method specifically comprises the following steps: S01, fix a 0.05mm PC film on a vacuum evaporation machine tooling, set the cooling roller temperature to 18℃; vacuumize to 4x10-3Pa, heat the aluminum wire to 1250℃, control the film coating speed to 1.0nm / s, and form an aluminum-coated reflective layer with a thickness of 100nm on the surface of the PC film.

[0031] S02, use a comma roller coating machine to coat a modified acrylate adhesive on the surface of a 0.075mm release film with a release force of 15g, and the coating thickness is 10μm; then put it into a 65-155℃ oven for pre-curing for 4min.

[0032] In step S02, the release film is a PET film.

[0033] S03, take a 0.08mm UV-resistant modified PMMA film, align it with the release film coated with the adhesive layer, hot-press composite at a pressure of 0.35MPa and a temperature of 85℃ for 12s, peel off the release film, then align it with the aluminum-coated surface of the aluminum-coated reflective layer, hot-press composite at a pressure of 0.35MPa and a temperature of 85℃ for 12s, and prepare a semi-finished film.

[0034] S04, take a 0.25mm TPU film, align it with the release film coated with the adhesive layer, hot-press composite at a pressure of 0.35MPa and a temperature of 85℃ for 12s, peel off the release film, then align it with the PC surface of the semi-finished film, hot-press composite at a pressure of 0.35MPa and a temperature of 85℃ for 12s, and prepare a finished product.

[0035] The reflective film manufactured by the method of the embodiment is detected, and the finished product has a mirror surface glossiness of 990GU, a scratch resistance of 4H, a TPU and aluminum-coated layer adhesion of 5.2N / 10mm, and an aluminum-coated layer and PMMA surface layer adhesion of 4.7N / 10mm; after 50 high and low temperature cycles of-40℃ to 80℃ and 1000h ultraviolet aging test, there is no delamination and discoloration, and the glossiness retention rate is 98%. Embodiment three,

[0036] The embodiment aims to provide a preparation method of a hot-pressing cast mirror surface reflective film for a car logo, taking a PET film as an intermediate layer, and manufacturing the reflective film in embodiment one. The method specifically comprises the following steps: S11, fix a 0.05mm PET film on a single-color printing machine tooling, add 15% aluminum paste ink in the tank, use a 120-mesh intaglio roller at a speed of 8m / min, then put it into a 65-85℃ oven for pre-curing for 4min, and form an aluminum-coated reflective layer with a thickness of 100nm on the surface of the PET film.

[0037] S12, using comma roller coating machine on the release force is 15g of 0.075mm release film surface coated modified acrylate adhesive, coating thickness 10μm; then put into 65-155℃ oven pre-cured 4min.

[0038] In step S12, the release film uses PET film.

[0039] S13, take thickness 0.08mm UV modified PMMA film, with coated adhesive layer of release film alignment, under the pressure of 0.35MPa, 85℃ temperature hot pressing composite 12s, peel off the release film, and then with the aluminized surface of aluminized reflector paste and alignment, under the pressure of 0.35MPa, 85℃ temperature hot pressing composite 12s, prepared into semi-finished film.

[0040] S14, take thickness 0.25mm TPU film, with coated adhesive layer of release film alignment, under the pressure of 0.35MPa, 85℃ temperature hot pressing composite 12s, peel off the release film, and then with the PET surface of semi-finished film paste and alignment, under the pressure of 0.35MPa, 85℃ temperature hot pressing composite 12s, prepared into finished product.

[0041] The reflective film manufactured by the method of the embodiment is detected, and the finished product has glossiness of 980GU, scratch resistance of 4H, interlayer adhesion of ≥4.5N / 10mm, stable performance after weather resistance test, and meets the use requirements of high-end car logo.

[0042] It is worth noting that: in example two and example three, the UV modified PMMA film used contains 0.3-0.5wt% benzotriazole UV agent; the modified TPU film is a TPU composite material added with 1.5-2wt% nano silicon dioxide, and the particle size of nano silicon dioxide is 20-30nm; the modified acrylate adhesive contains 3-5wt% isocyanate curing agent, and the solid content of the adhesive is ≥50%.

[0043] Of course, the above is only a typical example of the present application, in addition to this, the present application can have other various specific embodiments, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. A thermo-cast mirror-reflective film for car logos, characterized in that, include: Base support layer; The first adhesive transition layer is disposed on the base support layer; The intermediate layer is disposed on the first adhesive transition layer; An aluminum-plated reflective layer is placed on the intermediate layer; The second adhesive transition layer is arranged on the aluminum-plated reflective layer; And the surface layer, arranged on the adhesive transition layer; The substrate support layer is made of modified TPU film; the first and second adhesive transition layers are made of modified acrylic adhesive; the intermediate layer is made of PET film or PC film; and the surface layer is made of modified PMMA film.

2. The hot-pressed mirror reflective film for car logos as described in claim 1, characterized in that, The thickness of the substrate support layer is 0.25 mm; the thickness of the intermediate layer is 0.05 mm; the thickness of the aluminum-plated reflective layer is 80–120 nm; the coating thickness of the first adhesive transition layer and the second adhesive transition layer is 3–5 μm; and the thickness of the surface layer is 0.2–0.25 mm.

3. The hot-pressed mirror reflective film for car logos as described in claim 1, characterized in that, The modified TPU film contains 1.5–2 wt% nano-silica with a particle size of 20–30 nm.

4. The hot-pressed mirror reflective film for car logos as described in claim 1, characterized in that, The modified acrylate adhesive contains 3-5 wt% isocyanate curing agent, and the solid content of the adhesive is ≥50%.

5. The hot-pressed mirror reflective film for car logos as described in claim 1, characterized in that, The modified PMMA film contains 0.3-0.5 wt% benzotriazole UV stabilizer.

6. A method for preparing a hot-pressed mirror-reflective film for vehicle logos, characterized in that, include: S01. Fix a 0.05mm PC film to the vacuum evaporation machine fixture, set the cooling roller temperature to 18℃; evacuate to 4×10⁻³Pa, heat the aluminum wire to 1250℃, control the coating speed to 1.0nm / s, and form an aluminum reflective layer with a thickness of 100nm on the PET film surface. S02. A modified acrylic adhesive is coated onto the surface of a 0.075mm release film with a release force of 15g using a comma roller coater, with a coating thickness of 10μm; then it is placed in an oven at 65-155℃ for pre-curing for 4 minutes. S03. Take a 0.08mm thick UV-resistant modified PMMA film, align it with the release film coated with the adhesive layer, and hot-press it for 12s at 0.35MPa pressure and 85℃. Peel off the release film, then align it with the aluminum-plated reflective layer, and hot-press it for 12s at 0.35MPa pressure and 85℃ to prepare a semi-finished film. S04. Take a 0.25mm thick TPU film, align it with the release film coated with the adhesive layer, and hot-press it for 12s at 0.35MPa pressure and 85℃. Peel off the release film, then laminate and align it with the PC side of the semi-finished film, and hot-press it for 12s at 0.35MPa pressure and 85℃ to prepare the finished product.

7. A method for preparing a hot-pressed mirror-reflective film for vehicle logos, characterized in that, include: S11. Fix a 0.05mm PET film onto the fixture of a monochrome printing machine, add 15% aluminum silver paste ink to the material tank, use a 120-mesh gravure roller at a speed of 8m / min, and then place it in a 65-85℃ oven for pre-curing for 4 minutes to form an aluminum reflective layer with a thickness of 100nm on the surface of the PET film. S12. A modified acrylic adhesive is coated onto the surface of a 0.075mm PET film with a release force of 15g using a comma roller coater, with a coating thickness of 10μm; then it is placed in an oven at 65-155℃ for pre-curing for 4 minutes. S13. Take a 0.08mm thick UV-resistant modified PMMA film, align it with the release film coated with the adhesive layer, and hot-press it for 12s at 0.35MPa pressure and 85℃. Peel off the release film, then align it with the aluminum-plated reflective layer, and hot-press it for 12s at 0.35MPa pressure and 85℃ to prepare a semi-finished film. S14. Take a 0.25mm thick TPU film, align it with the release film coated with the adhesive layer, and hot-press it for 12s at 0.35MPa pressure and 85℃. Peel off the release film, then align it with the PET side of the semi-finished film, and hot-press it for 12s at 0.35MPa pressure and 85℃ to prepare the finished product.

8. A method for preparing a hot-pressed mirror-reflective film for vehicle logos as described in claim 6 or 7, characterized in that, The UV-resistant modified PMMA film contains 0.3-0.5 wt% benzotriazole UV-resistant agent.

9. A method for preparing a hot-pressed mirror-reflective film for vehicle logos as described in claim 6 or 7, characterized in that, The modified TPU film is a TPU composite material with 1.5-2 wt% added nano-silica, and the nano-silica particle size is 20-30 nm.

10. A method for preparing a hot-pressed mirror-reflective film for vehicle logos as described in claim 6 or 7, characterized in that, The modified acrylate adhesive contains 3-5 wt% isocyanate curing agent, and the solid content of the adhesive is ≥50%.

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