Gold stamping film for interior and exterior decoration of automobile and preparation method of gold stamping film

Abstract

The invention relates to a gold stamping film for automobile interior and exterior decoration and a preparation method and application thereof, and relates to the technical field of heat transfer printing. The gold stamping film comprises a base material, a stripping layer, a color layer, a metal layer and a bonding layer which are sequentially arranged from top to bottom. The stripping layer comprises the following raw materials in parts by weight: 15-25 parts of thermoplastic acrylic resin and 1-3 parts of wax; the color layer is prepared from the following raw materials in parts by weight: 8 to 12 parts of epoxy modified acrylic resin, 4 to 6 parts of polyester modified organic silicon resin, 8 to 11 parts of pigment, 0.1 to 0.3 part of drier, 0.1 to 0.8 part of light stabilizer, 0.1 to 0.6 part of light absorber and 0.5 to 2 parts of curing agent. The gold stamping film prepared through the method has excellent impact resistance, alcohol resistance and water resistance, meanwhile, the fragmentation resistance is good, the adhesive force is excellent, the structure is simple, and good economical efficiency is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of hot stamping, and in particular to a hot stamping film for automobile interior and exterior decoration and a preparation method thereof. Background Art

[0002] Hot stamping is an important means of surface decoration for plastic parts, and is also a common decoration process for household appliances and consumer electronic products. It is to heat the hot stamping head to press the metal or paint layer on the hot stamping film onto the surface of the workpiece to achieve the purpose of decoration or marking. The coating of the color layer on the surface of furniture and electrical appliances can be replaced by hot stamping technology. The advantage of hot stamping technology is that it can significantly improve the user's operating environment. Unlike traditional printing technology, the process of color attachment and transfer does not emit a large amount of VOC during hot stamping, and ink drying is not required.

[0003] As the main form of hot stamping technology, hot stamping film has promoted the development of hot stamping technology to a great extent. It is widely used with its advantages of various forms, such as automotive interior and exterior trims, greeting cards, cosmetics, electronic components, etc. There are many varieties and specifications of hot stamping film. It can be divided into pigment foil, metal foil, wood grain box, etc. according to the adhesion layer and appearance. The patterns include brush patterns, bright silver, bright gold, etc. Hot stamping film is most commonly used in hot stamping of automotive interior and exterior trims.

[0004] Automotive interior parts have complex shapes and deep contours, requiring the highest level of gloss and extremely durable interior and exterior surfaces. At the same time, costs and processes must meet environmental requirements. Saving costs while improving performance and design are gradually becoming the most important factors for the success of the automotive industry. These are exactly what the current automotive industry needs for this innovative decorative process. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a hot stamping film for automobile interior and exterior decoration and a preparation method thereof. The hot stamping film prepared by the present invention has excellent impact resistance, alcohol resistance, and water resistance, as well as good resistance to cracking and excellent adhesion. It has a simple structure and good economy.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] The first object of the present invention is to provide a hot stamping film for automobile interior and exterior decoration, wherein the hot stamping film comprises a substrate, a peeling layer, a color layer, a metal layer, and a bonding layer arranged in sequence from top to bottom;

[0008] The peeling layer comprises the following raw materials in parts by weight: 15 to 25 parts of thermoplastic acrylic resin and 1 to 3 parts of wax;

[0009] The color layer comprises the following raw materials in parts by weight: 8-12 parts of epoxy modified acrylic resin, 4-6 parts of polyester modified silicone resin, 8-11 parts of pigment, 0.1-0.3 parts of drying agent, 0.1-0.8 parts of light stabilizer, 0.1-0.6 parts of light absorber and 0.5-2 parts of curing agent.

[0010] The invention has the following beneficial effects: the invention provides a hot stamping film for automobile interior and exterior decoration, which has strong water resistance, crack resistance and impact resistance. Adhesion can be enhanced by mixing epoxy-modified acrylic resin, acrylic resin and chlorovinyl resin. Weather resistance can be increased by blocking short wavelengths simultaneously by two light absorbers. Crack resistance and impact resistance can be enhanced by mixing polyester-modified silicone resin with a curing agent.

[0011] Further, the pigment includes a highly transparent nano pigment yellow pigment.

[0012] The beneficial effect of adopting the above further scheme is that the pigment added to the color layer is directly related to the color effect and durability of the hot stamping film. The pigment selected by the present invention has excellent light resistance and can keep the color from fading under long-term ultraviolet irradiation. For example, in an accelerated aging experiment simulating long-term light exposure of automobile interior, the color change rate was less than 30% after 1800 hours of high-intensity ultraviolet irradiation. Its good heat resistance can ensure that it will not decompose or change color under high temperature conditions (130-180°C) during the hot stamping process. In terms of chemical resistance, it can resist the erosion of various chemical substances that the automobile interior may be exposed to, such as detergents, perfumes, etc., to ensure the stability and brightness of the color. The pigment has good compatibility with other ingredients, and no chemical reaction or agglomeration will occur during the mixing process, ensuring the uniformity and consistency of the color layer.

[0013] Furthermore, the drying agent includes but is not limited to dibutyltin dilaurate; the curing agent includes but is not limited to hexamethylene diisocyanate trimer.

[0014] The beneficial effect of adopting the above further scheme is that the drying agent plays an important role in the drying process of the color layer. It can accelerate the volatilization rate of the solvent in the coating, promote the cross-linking reaction of the resin, shorten the drying time, and improve production efficiency. In actual production, after using the drying agent, the drying time of the color layer can be shortened, effectively improving the production capacity of the production line. The curing agent reacts chemically with the polyester modified silicone resin and other components to form a three-dimensional network structure, which significantly enhances the hardness, wear resistance and adhesion of the color layer. The hardness and wear resistance of the cured color layer are improved, ensuring that the hot stamping film can withstand mechanical effects such as friction and scratching in daily use, while maintaining good bonding with other film layers and not easy to fall off.

[0015] Based on the above technical solution, the present invention can also be improved as follows.

[0016] Furthermore, the epoxy-modified acrylic resin has an acid value of 3-10 mg / KOH, a hydroxyl content of 1-5%, a weight average molecular weight of 8000-30000, a glass transition temperature of 60-70° C., and a solid content of 50%-60%.

[0017] The beneficial effect of adopting the above further scheme is that the epoxy-modified acrylic resin in the above range can minimize the viscosity of the film, thereby improving the reliability, adhesion and water resistance of the film. When the solid content of the epoxy-modified acrylic resin is less than 50%, it is difficult to achieve the reliability of the film. When the content is greater than 60%, the adhesion and water resistance may be reduced.

[0018] Furthermore, the polyester modified silicone resin has an acid value of 0.01 to 0.05 mg / KOH, a hydroxyl content of 0.1 to 0.5%, a weight average molecular weight of 9,000 to 15,000, a glass transition temperature of 70 to 80° C., and a solid content of 10% to 15%.

[0019] The beneficial effect of adopting the above further scheme is that the polyester modified silicone resin defined in the present invention can provide hardness to the paint film and enhance the stone chip resistance. Among them, when the solid content is less than 10%, the stone chip resistance of the material may be reduced. When the content is greater than 15%, the processability (leveling) of the coating may be reduced.

[0020] Furthermore, the substrate includes at least one of ASA film, PC film, ABS film, PMMA film, and BOPET film; and the metal layer is an aluminum metal layer.

[0021] The beneficial effect of adopting the above further scheme is that the substrate is used as the basis for the hot stamping film coating. When in use, the substrate is peeled off from the other structures of the hot stamping film through the peeling layer, and then the remaining part is attached to the logo. If the substrate is too thin, the substrate is easily damaged and deformed when peeling, which affects the use of the hot stamping film; on the contrary, if the substrate is too thick, the thermal conductivity of the entire hot stamping film is insufficient, resulting in excessively high hot stamping temperatures. The substrate with a thickness of 20-25μm has a uniform bonding strength with the other parts of the hot stamping film, which can quickly and effectively achieve the above peeling process without affecting the use of the hot stamping film.

[0022] Furthermore, the adhesive layer comprises the following raw materials in parts by weight: 16 to 18 parts of carboxyl-type ternary copolymer chlorovinyl resin and 3 to 6 parts of chlorinated polypropylene.

[0023] The beneficial effect of adopting the above further solution is that the follower layer melts at a high temperature, so that the hot stamping film can be conveniently thermally transferred onto the transfer substrate.

[0024] Furthermore, the weight average molecular weight of the thermoplastic acrylic resin is 20,000 to 80,000; and the wax includes at least one of oxidized polyethylene wax, paraffin wax, montan wax, and carnauba wax.

[0025] The beneficial effect of adopting the above further scheme is that the thermoplastic acrylic resin plays a key role in the present invention. Its weight average molecular weight is in the range of 20,000 to 80,000, and the molecular weight is moderate, so that the resin has good flexibility and weather resistance. Thermoplastic resin softens when heated and solidifies when cooled, and this performance can be maintained no matter how many times the heating and cooling are repeated. It will only undergo chemical reactions under extreme conditions and has good chemical structure stability. In the use environment of automotive interior and exterior decoration, the temperature range is large, from the cold winter to the hot summer, the resin can maintain good physical properties and will not become brittle or soften due to temperature changes. At the same time, its good weather resistance can effectively resist the influence of natural factors such as ultraviolet radiation and acid rain erosion, and can still maintain the integrity and stability of the film layer under long-term exposure to outdoor environments, ensuring the service life of the hot stamping film.

[0026] At the same time, the thermoplastic acrylic resin material with a weight average molecular weight of 20,000 to 80,000 has a low viscosity and a stable structure. The structures on both sides of the peeling layer can be separated with a small force, and a thickness of 0.1-0.5μm can meet the requirements of the hot stamping film. A peeling layer that is too thin or too thick is not only not conducive to peeling, but also affects the aesthetics of the hot stamping film itself.

[0027] The addition of wax can ensure the stable peeling effect of the peeling layer. Oxidized polyethylene wax has excellent dispersibility and can be evenly dispersed in the peeling layer and closely combined with thermoplastic acrylic resin, thereby improving the overall stability of the peeling layer. Its good lubricity helps to reduce the peeling force during the peeling process, making the peeling smoother and ensuring the integrity of the hot stamping film. Paraffin wax has a low cost and can help control production costs and improve the market competitiveness of products while ensuring basic performance. Montan wax and carnauba wax can provide a certain moisture-proof performance for the peeling layer, preventing moisture from penetrating into the film layer and affecting the adhesion and overall performance between the film layers.

[0028] Furthermore, the light stabilizer includes at least one of benzophenone, oxalylanilide, benzotriazole, triazine, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 2,4-di-tert-butylphenyl-3,5-di-tert-butylbenzoate, hydroxyphenyltriazines, and hindered amine light stabilizers; the light absorber includes a hydroxyphenyl triazine ultraviolet absorber; and the curing agent includes a hexamethylene diisocyanate trimer.

[0029] The beneficial effect of adopting the above further scheme is that short wavelengths can be blocked by light stabilizers and light absorbers, thereby enhancing weather resistance. The different types of light stabilizers and light absorbers used in the present invention work synergistically to provide excellent weather resistance for hot stamping films. Benzophenone light stabilizers can absorb ultraviolet rays and convert them into harmless heat energy, effectively preventing ultraviolet rays from damaging the film layer. Benzotriazole light stabilizers further enhance the anti-aging ability of the film layer by capturing free radicals and inhibiting the occurrence of photooxidation reactions. Hindered amine light stabilizers can not only absorb ultraviolet rays, but also decompose the hydroperoxides produced during photooxidation, playing a role in long-term stability. Hydroxyphenyl triazine ultraviolet absorbers have high absorption efficiency and a wide absorption wavelength range. When used in combination with other light stabilizers, they can more comprehensively block ultraviolet rays and short-wavelength light, greatly reducing the risk of fading and aging of hot stamping films when used outdoors, ensuring that they maintain good appearance and performance for a long time.

[0030] Furthermore, the thickness of the substrate is 20-30 μm; the thickness of the peeling layer is 0.1-0.5 μm; the thickness of the color layer is 3-8 μm; the thickness of the metal layer is 30-50 nm; and the thickness of the adhesive layer is 1.5-3 μm.

[0031] The second object of the present invention is to provide a method for preparing a hot stamping film for automobile interior and exterior decoration, the preparation method comprising the following steps:

[0032] S1: Prepare liquid: Stripping liquid: Mix and dissolve thermoplastic acrylic resin and wax together to prepare stripping liquid for standby use; Color liquid: Dissolve epoxy modified acrylic resin, polyester modified silicone resin, pigment, drier, light stabilizer, light absorber and curing agent in solvent and mix and dissolve together to prepare color liquid for standby use; Adhesive liquid: Dissolve carboxyl type ternary copolymer chlorovinyl resin and chlorinated polypropylene in solvent to prepare adhesive liquid for standby use;

[0033] S2: Preparation of peeling layer: coating the peeling liquid on one side of the substrate 1, and then drying to form a peeling layer; preparation of color layer: coating the color liquid on one side of the peeling layer away from the substrate 1, and then drying to form a color layer; forming a metal layer by aluminum plating on the color layer at 70-180°C and 1-10Pa by vapor chemical deposition; coating the bonding liquid on one side of the metal layer away from the substrate 1, and then drying to form a bonding layer; thereby obtaining a hot stamping film.

[0034] The invention has the following beneficial effects: the invention provides a method for preparing a hot stamping film for automobile interior and exterior decoration, which has strong water resistance, crack resistance and impact resistance. Adhesion can be enhanced by mixing epoxy-modified acrylic resin, acrylic resin and chlorovinyl resin. Weather resistance can be increased by blocking short wavelengths simultaneously by two light absorbers. Crack resistance and impact resistance can be enhanced by mixing polyester-modified silicone resin with a curing agent.

[0035] The third object of the present invention is to provide an application of a hot stamping film for automobile interior and exterior decoration, and to use the hot stamping film in the decorative processing of automobile interior and exterior decoration.

[0036] The beneficial effect of the present invention is that through the above application method, the hot stamping film of the present invention can be effectively applied to the decoration processing of automobile interior and exterior decoration, achieving beautiful and durable decoration effect, while meeting the strict requirements of the automobile industry on product quality and performance. In the actual application process, the parameters and operations of each step can be appropriately adjusted and optimized according to specific production needs and product characteristics to obtain the best hot stamping effect.

[0037] Further, the specific steps of the decoration process are as follows:

[0038] The surfaces of the interior and exterior parts of the automobile are pretreated, the hot stamping film is installed on the hot stamping equipment, the hot stamping equipment is preheated to reach the set temperature, and then the hot stamping equipment is started, the hot stamping film is pressed against the surface of the interior and exterior parts of the automobile, and hot stamping is performed for a few seconds to tens of seconds at the same time. After the hot stamping is completed, the hot stamped part is immediately cooled to quickly solidify the hot stamping film, and the decorative processing of the interior and exterior of the automobile is completed.

[0039] The beneficial effect of adopting the above further scheme is: cleaning the surface of the interior and exterior parts of the automobile to remove impurities such as oil, dust, etc., so as to ensure good adhesion between the hot stamping film and the substrate. For some substrates with relatively smooth surfaces, appropriate surface roughening treatment can be performed as needed, such as lightly grinding with sandpaper or chemical etching to increase the surface roughness and improve adhesion, but care should be taken not to excessively damage the surface of the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the structure of the hot stamping film prepared in Example 1 of the present invention.

[0041] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0042] 1-substrate; 2-peeling layer; 3-color layer; 4-metal layer; 5-adhesive layer. DETAILED DESCRIPTION

[0043] The principles and features of the present invention are described below, and the examples are only used to explain the present invention and are not used to limit the scope of the present invention. If no specific technology or conditions are specified in the embodiments, the technology or conditions described in the literature in this field or the product instructions are used. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased through regular channels.

[0044] Example 1: Preparation of hot stamping film

[0045] S1: Prepare liquid: Stripping liquid: Mix 20 parts of thermoplastic acrylic resin (MB-2 Bolier Chemical) and 2 parts of oxidized polyethylene wax (4202E; Mitsui) in 39 parts of 2-butanone and 39 parts of toluene to make a stripping liquid for use; Color liquid: Mix 10 parts of epoxy modified acrylic resin (SWA5102 Sanwang Resin), 5 parts of polyester modified silicone resin (SH9615E Longsheng Sihai), 10 parts of pigment (MicrolithYellow 2040K BASF), 0.1 parts of drying agent (Dabco T12 Gas Chemical), 0.5 parts of light stabilizer (Tinuvin 460), 0.5 parts of light absorber (Tinuvin 479), 1 part of curing agent (HT 100 million Hua) was dissolved in 36.5 parts of 2-butanone and 36.5 parts of toluene, mixed and dissolved to make a color liquid for standby use; Adhesive liquid: 15 parts of carboxyl type ternary copolymer chlorovinyl resin (SOLBIN-M5 Nissin Chemical) and 5 parts of chlorinated polypropylene (DX-526P Guangzhou Haoyi) were dissolved in 40 parts of 2-butanone and 40 parts of toluene to make an adhesive liquid for standby use;

[0046] S2: Preparation of peeling layer: coating the peeling liquid on one side of the substrate 1 (25μm BOPET film (Guangdong Shunming)), and then drying to form a 0.1-0.5μm peeling layer 2; Preparation of color layer: coating the color liquid on one side of the peeling layer away from the substrate 1, and then drying to form a 3-8μm color layer 3; forming a 30-50nm metal layer 4 on the color layer by vapor chemical deposition at 70-180°C and 1-10Pa; coating the bonding liquid on one side of the metal layer 4 away from the substrate 1, and then drying to form a 1.5-3μm bonding layer 5; thereby obtaining a hot stamping film.

[0047] Example 2: Preparation of hot stamping film

[0048] When preparing the hot stamping film, the present embodiment is different from the embodiment 1 only in that the number of raw materials for the color layer is changed, and the remaining preparation steps, preparation conditions, and material sources are consistent with those of the embodiment 1, as shown in Table 1:

[0049] Table 1

[0050] raw material Number of copies Manufacturer Epoxy modified acrylic resin 10 servings SWA5102 Sanwang resin Polyester modified silicone resin 5 servings SH9615E Longsheng Sihai pigment 10 servings Microlith Yellow 2040K BASF Light Stabilizer 0.5 serving Tinuvin460 Light absorber 0.5 serving Tinuvin479 Curing agent 1 serving HT100 Wanhua Toluene 34.25 servings / 2-Butanone 34.25 servings /

[0051] Example 3: Preparation of hot stamping film

[0052] When preparing the hot stamping film, the present embodiment is different from the embodiment 1 only in that the raw material of the adhesive layer is changed, and the remaining preparation steps, preparation conditions, and material sources are consistent with those of the embodiment 1, as shown in Table 2:

[0053] Table 2

[0054]

[0055]

[0056] Example 4: Preparation of hot stamping film

[0057] When preparing the hot stamping film, the present embodiment is different from the embodiment 1 only in that the raw material of the peeling layer is changed, and the remaining preparation steps, preparation conditions, and material sources are consistent with those of the embodiment 1, as shown in Table 3:

[0058] Table 3

[0059] raw material Number of copies Manufacturer Thermoplastic acrylic resin 20 servings MB-2 Bolier Chemical Oxidized polyethylene wax 2 servings 4202E Mitsui Toluene 39 servings / 2-Butanone 39 servings /

[0060] Example 5: Preparation of hot stamping film

[0061] When preparing the hot stamping film, the present embodiment is different from the embodiment 1 only in that the raw material of the peeling layer is changed, and the remaining preparation steps, preparation conditions, and material sources are consistent with those of the embodiment 1, as shown in Table 4:

[0062] Table 4

[0063]

[0064]

[0065] Comparative Example 1: Preparation of hot stamping film

[0066] When preparing the hot stamping film, the comparative example is different from Example 1 in that the peeling layer 2 and the adhesive layer 5 are not prepared, and the remaining preparation steps, preparation conditions, and material sources are consistent with those of Example 1.

[0067] Comparative Example 2: Preparation of hot stamping film

[0068] When preparing the hot stamping film, the comparative example is different from Example 1 in that the color layer 3 and the adhesive layer 5 are not prepared, and the remaining preparation steps, preparation conditions, and material sources are consistent with those of Example 1.

[0069] Comparative Example 3: Preparation of hot stamping film

[0070] When preparing the hot stamping film, the comparative example is different from Example 1 in that the peeling layer 2 and the color layer 3 are not prepared, and the remaining preparation steps, preparation conditions, and material sources are consistent with those of Example 1.

[0071] Comparative Example 4: Preparation of hot stamping film

[0072] When preparing the hot stamping film, this comparative example is different from Example 1 only in that the raw materials of the peeling layer 2 are different, and the remaining preparation steps, preparation conditions, and material sources are consistent with Example 1, as shown in Table 5:

[0073] Table 5

[0074] raw material Number of copies Manufacturer Vinyl chloride-vinyl acetate copolymer 19 servings MLC-14-55 Pan Gao Chemical Toluene 40.5 copies / 2-Butanone 40.5 copies /

[0075] Comparative Example 5: Preparation of hot stamping film

[0076] When preparing the hot stamping film, this comparative example is different from Example 1 only in that the raw materials of the color layer 3 are different, and the remaining preparation steps, preparation conditions, and material sources are consistent with Example 1, as shown in Table 6:

[0077] Table 6

[0078] raw material Number of copies Manufacturer Epoxy modified acrylic resin 10 servings SWA5102 Sanwang resin Polyester modified silicone resin 5 servings SH9615E Longsheng Sihai pigment 10 servings Microlith Yellow 2040K BASF Light Stabilizer 0.5 serving Tinuvin460 Light absorber 0.5 serving Tinuvin479 Toluene 34.25 servings / 2-Butanone 34.25 servings /

[0079] Example 6: Hot stamping film is used for decorative processing of automobile interior and exterior

[0080] (1) Clean the surfaces of the interior and exterior parts of the automobile to remove impurities such as oil, dust, etc.; install the hot stamping film prepared in Example 1 on the unwinding device of the hot stamping equipment (MK920SS; Tianjin Changrong), and accurately position the hot stamping film according to the shape and size of the transferred substrate by the positioning device on the equipment to ensure that the position of the hot stamping pattern on the substrate is accurate.

[0081] (2) Set the hot stamping temperature to 130-180℃, the pressure to 15KN and the hot stamping time to 1-3 seconds. Before the hot stamping, preheat the hot stamping equipment so that the hot stamping head reaches the set temperature, start the hot stamping equipment, and the hot stamping head presses the hot stamping film against the surface of the transferred substrate under the set pressure. At the same time, heat the film to soften the metal layer and color layer and transfer them to the substrate. After the hot stamping is completed, the hot stamped area is immediately cooled naturally for 1-60 minutes to ensure that the film is completely cured.

[0082] Performance Testing:

[0083] The hot stamping films prepared in Examples 1 to 5 and Comparative Examples 1 to 5 were used for printing tests, and the pattern film layer was transferred to the surface of the substrate by hot stamping transfer under the conditions of high temperature of 130 to 180° C. and pressure of 15 KN.

[0084] ①Adhesion test

[0085] The German BYK cross-cut knife was used for testing, and the grade was based on the ISO 2409 cross-cut test standard, as shown in Table 7:

[0086] Table 7 Evaluation criteria

[0087]

[0088]

[0089] ②Alcohol friction resistance test

[0090] Refer to GB / T 17497.1-2012. The MCJ-01A friction tester independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd. was used to test the wear resistance of the hot stamping films prepared in Examples 1 to 5 and Comparative Examples 1 to 5. The friction pressure was 20±0.2N, the friction speed was 43 times / min, the number of frictions was 40 times, the tip was wrapped with a dust-free cloth, and alcohol was used to wet the tip of the dust-free cloth along the pipe. The wear resistance of the samples was determined by visual inspection, and the judgment criteria are shown in Table 8:

[0091] Table 8 Evaluation criteria

[0092] √ The ink layer on the printed surface does not show the bottom (fading) × The ink layer on the printed surface is exposed (fading)

[0093] ③Anti-fragmentation performance test

[0094] At a launch distance of 100mm, a launch angle of 45° and a load of 5.0Kg f / cm 2 Under the condition of the launch pressure, 50g of regulated gravel (JIS Crushed Gravel No 7 Stone, 2.5-5mm, 350-400 stone) and a gravel crushing tester (Gravelo Meter: Standardized Product SAF J 400) were used for testing. The judgment criteria are shown in Table 9:

[0095] Table 9 Evaluation criteria

[0096]

[0097]

[0098] ④Water resistance:

[0099] The hot stamping films prepared in Examples 1 to 5 and Comparative Examples 1 to 5 were immersed in a 40±2° C. water bath for 12 hours, and then subjected to appearance evaluation and adhesion performance test. The evaluation criteria refer to the evaluation criteria in Table 7.

[0100] ⑤Impact resistance:

[0101] The test is carried out in accordance with the national standard GB 1732-2020 "Determination of impact resistance of paint films".

[0102] Table 9 Evaluation criteria

[0103] √ The paint film is not damaged or cracked × Paint film damage and cracking

[0104] 6. Aging performance test:

[0105] The test was carried out in accordance with standard DB51 / T 2381-2017 “Accelerated aging method for determination of weather resistance of automotive interiors”.

[0106] Table 9 Evaluation criteria

[0107] √ Color change rate ≤30% × Color change rate>30%

[0108] The above test was repeated three times, and the results are shown in Table 12:

[0109] Table 12

[0110]

[0111]

[0112] From Table 12, we can get:

[0113] The comprehensive performance of the hot stamping films of Examples 1 to 5 is better than the comprehensive performance of the hot stamping films of Comparative Examples 1 to 4. The hot stamping films of Comparative Examples 1 to 3 cannot be transferred. The reason is that in the process of preparing the hot stamping film of Comparative Example 1, a peeling layer and an adhesive layer are missing; the hot stamping film of Comparative Example 2 lacks a color layer and an adhesive layer; the hot stamping film of Comparative Document 3 lacks a color layer and a peeling layer; it can be seen that the peeling layer, color layer, and adhesive layer in the embodiments of the present invention can better improve the adhesion between the layers of the hot stamping film. No drying agent and curing agent are added to the color layer of the hot stamping film of Comparative Example 4, and the anti-cracking and water resistance are poor.

[0114] In summary, in the case of lacking any layer structure, the hot stamping film provided by the present invention has a coating structure on the film that cannot be transferred to the substrate, or insufficient performance is observed in all evaluation items such as chipping resistance, water resistance and alcohol friction resistance. In addition, it can be confirmed that in the case of not using a curing agent or a drying agent, the alcohol friction resistance performance is significantly deteriorated.

[0115] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A hot stamping film for automobile interior and exterior decoration, characterized in that: The hot stamping film comprises a substrate, a peeling layer, a color layer, a metal layer, and an adhesive layer which are arranged in sequence from top to bottom; The peeling layer comprises the following raw materials in parts by weight: 15 to 25 parts of thermoplastic acrylic resin and 1 to 3 parts of wax; The color layer comprises the following raw materials in parts by weight: 8-12 parts of epoxy modified acrylic resin, 4-6 parts of polyester modified silicone resin, 8-11 parts of pigment, 0.1-0.3 parts of drying agent, 0.1-0.8 parts of light stabilizer, 0.1-0.6 parts of light absorber and 0.5-2 parts of curing agent.

2. The hot stamping film for automobile interior and exterior decoration according to claim 1, characterized in that: The epoxy modified acrylic resin has an acid value of 3-10 mg / KOH, a hydroxyl content of 1-5%, a weight average molecular weight of 8000-30000, a glass transition temperature of 60-70° C., and a solid content of 50%-60%.

3. The hot stamping film for automobile interior and exterior decoration according to claim 1, characterized in that: The polyester modified organic silicon resin has an acid value of 0.01-0.05 mg / KOH, a hydroxyl content of 0.1-0.5%, a weight average molecular weight of 9000-15000, a glass transition temperature of 70-80° C., and a solid content of 10%-15%.

4. The hot stamping film for automobile interior and exterior decoration according to claim 1, characterized in that: The substrate includes at least one of an ASA film, a PC film, an ABS film, a PMMA film, and a BOPET film; and the metal layer is an aluminum metal layer.

5. The hot stamping film for automobile interior and exterior decoration according to claim 1, characterized in that: The adhesive layer comprises the following raw materials in parts by weight: 16 to 18 parts of carboxyl type ternary copolymer chlorovinyl resin and 3 to 6 parts of chlorinated polypropylene.

6. The hot stamping film for automobile interior and exterior decoration according to claim 1, characterized in that: The weight average molecular weight of the thermoplastic acrylic resin is 20,000 to 80,000; the wax includes at least one of oxidized polyethylene wax, paraffin wax, montan wax and carnauba wax.

7. The hot stamping film for automobile interior and exterior decoration according to claim 1, characterized in that: The light stabilizer includes at least one of benzophenone, oxalylanilide, benzotriazole, triazine, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 2,4-di-tert-butylphenyl-3,5-di-tert-butylbenzoate, hydroxyphenyltriazine, and hindered amine light stabilizers; the light absorber includes hydroxyphenyltriazine ultraviolet absorber; the drying agent includes dibutyltin dilaurate; and the curing agent includes hexamethylene diisocyanate trimer.

8. The hot stamping film for automobile interior and exterior decoration according to claim 1, characterized in that: The thickness of the substrate is 20-30 μm; the thickness of the peeling layer is 0.1-0.5 μm; the thickness of the color layer is 3-8 μm; the thickness of the metal layer is 30-50 nm; and the thickness of the adhesive layer is 1.5-3 μm.

9. A method for preparing a hot stamping film for automobile interior and exterior decoration according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: S1: Prepare solution: Stripping liquid: Mix and dissolve thermoplastic acrylic resin and wax to make a stripping liquid for standby use; Color liquid: Dissolve epoxy modified acrylic resin, polyester modified silicone resin, pigment, drying agent, light stabilizer, light absorber and curing agent in solvent and mix and dissolve to make a color liquid for standby use; Adhesive liquid: Dissolve carboxyl type ternary copolymer chlorovinyl resin and chlorinated polypropylene in solvent to make an adhesive liquid for standby use; S2: Preparation of peeling layer: coating the peeling liquid on one side of the substrate, and then drying to form a peeling layer; preparation of color layer: coating the color liquid on one side of the peeling layer away from the substrate, and then drying to form a color layer; forming a metal layer by vapor chemical deposition aluminum at 70-180°C and 1-10Pa on the color layer; coating the bonding liquid on one side of the metal layer away from the substrate, and then drying to form a bonding layer; thereby obtaining a hot stamping film.

10. The use of a hot stamping film for automobile interior and exterior decoration according to any one of claims 1 to 8, characterized in that: The hot stamping film is used in the decoration of the interior and exterior decoration of automobiles.

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