Wrinkled highlight release film, wrinkled mirror synthetic leather and preparation method of wrinkled highlight release film and wrinkled mirror synthetic leather

Abstract

The invention provides a wrinkled highlight release film, wrinkled mirror synthetic leather and a preparation method of the wrinkled mirror synthetic leather, and relates to the technical field of synthetic leather production. The preparation method of the wrinkle highlight release film comprises the following steps: coating an ultraviolet curing release agent coating liquid on a base material, carrying out first ultraviolet irradiation treatment, and meanwhile, carrying out impressing by utilizing a wrinkle mold roller to obtain a wrinkle layer; the wrinkle layer is coated with brightening coating liquid, after drying treatment is conducted, second-time ultraviolet irradiation treatment is conducted, a brightening layer is obtained on the wrinkle layer, and therefore the wrinkle highlight release film is obtained. The glossiness of the wrinkled mirror surface synthetic leather prepared by adopting the wrinkled highlight release film provided by the invention is 90-100GU, and is not lower than that of the wrinkled mirror surface synthetic leather prepared by the process steps of extra embossing, pattern absorption or pattern rubbing. By adopting the method disclosed by the invention, the production process of the wrinkled mirror surface synthetic leather is further simplified while the high glossiness of the wrinkled mirror surface synthetic leather is ensured, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of synthetic leather production, in particular to a wrinkle high-gloss release film, wrinkle mirror synthetic leather and a preparation method thereof. Background Art

[0002] Mirror synthetic leather is a classic product, widely used in various products such as luggage and shoes. Among them, wrinkle mirror synthetic leather combines the characteristics of both mirror and texture, and is a high-end product among mirror synthetic leathers. At present, the traditional method of manufacturing wrinkle mirror synthetic leather includes: using a high-gloss mirror release film as a carrier, coating it with a surface layer and an intermediate adhesive layer in sequence, applying a base fabric flatly to the adhesive layer, and finally separating the high-gloss release film from the surface layer to produce a high-gloss mirror synthetic leather; then, it is necessary to use embossing, suction, or rubbing to make the mirror synthetic leather into a mirror synthetic leather with texture, that is, wrinkle mirror synthetic leather. This production method requires an additional process to make the mirror synthetic leather into a mirror synthetic leather with texture. The process is complex and the production efficiency is low. Summary of the Invention

[0003] The problem solved by the present invention is how to further simplify the production process of the wrinkle mirror synthetic leather while ensuring that the wrinkle mirror synthetic leather has high gloss.

[0004] To solve the above problems, the present invention provides a method for preparing a wrinkled high-gloss release film, comprising: Step S1: Apply a UV-curable release agent coating liquid on a substrate, perform a first UV-light irradiation treatment, and simultaneously perform embossing using a wrinkled mold roller to obtain a wrinkled layer; Step S2: Apply a brightening coating liquid on the wrinkled layer, dry it, and then perform a second UV-light irradiation treatment to obtain a brightening layer on the wrinkled layer, thereby producing a wrinkled high-gloss release film.

[0005] Optionally, in step S1, the components of the UV-curable release agent coating liquid include, by weight, 50 to 75 parts of acrylate oligomer, 20 to 45 parts of reactive diluent, 2 to 5 parts of photoinitiator, and 0.5 to 2 parts of silicone additive.

[0006] Optionally, in step S1, the acrylate oligomer includes at least one of polyurethane acrylate and epoxy acrylate; the reactive diluent includes at least one of tetrahydrofuran methyl acrylate, 1,6-ethylene glycol diacrylate and neopentyl glycol diacrylate; the photoinitiator includes at least one of 1-hydroxy-cyclohexyl benzophenone and 2,4,6-trimethylbenzoyldiphenylphosphine oxide; and the organosilicon additive is an organosilicon oligomer.

[0007] Optionally, in step S2, the components of the brightening coating liquid include, by weight: 5 to 10 parts of polyurethane acrylate, 1.5 to 2.5 parts of silicone polyurethane acrylate, 1 to 3 parts of acrylic acid reactive diluent, 0.5 to 1 part of photoinitiator, 0.1 to 0.25 parts of leveling agent, 30 to 40 parts of toluene, and 40 to 50 parts of ethyl acetate.

[0008] Optionally, the acrylic reactive diluent includes at least one of isooctyl acrylate, hydroxyethyl acrylate and isobornyl acrylate.

[0009] Optionally, in step S1, the ultraviolet energy used in the first ultraviolet irradiation treatment is 200 mJ / cm 2 Up to 1000mJ / cm 2 In step S2, the ultraviolet energy used in the second ultraviolet irradiation treatment is 100mJ / cm 2 Up to 500mJ / cm 2 .

[0010] The present invention also provides a wrinkle high-gloss release film, which adopts the preparation method of the wrinkle high-gloss release film as described above.

[0011] The present invention also provides a method for preparing wrinkle mirror synthetic leather, comprising: sequentially coating a polyurethane surface layer, a polyurethane intermediate layer and a polyurethane adhesive layer on the wrinkle high-gloss release film as described above, then laminating the polyurethane adhesive layer to a base fabric, and performing a heating and curing treatment to obtain wrinkle mirror synthetic leather.

[0012] Optionally, the temperature of the heating and curing treatment is 110° C. to 150° C., and the time is 3 min to 5 min.

[0013] The present invention also provides a wrinkle mirror synthetic leather, which is made by the above-mentioned preparation method of wrinkle mirror synthetic leather.

[0014] Compared to related technologies, the present invention provides a method for preparing a wrinkled, high-gloss release film. A UV-curable release agent coating liquid is applied to a substrate, and while undergoing a first UV irradiation treatment, a wrinkled mold roller is used to emboss the coating during the UV curing process to obtain a wrinkled layer. A brightening layer is then formed on the wrinkled layer, thereby producing a wrinkled, high-gloss release film. The wrinkled and brightening layers together form the wrinkled, high-gloss release film. Experiments have shown that the wrinkled, high-gloss release film produced using the present invention has a gloss greater than 150 GU. Using this wrinkled, high-gloss release film to produce wrinkled, mirror-finish synthetic leather reduces the production process steps of embossing, embossing, or rubbing, improving the production efficiency of the wrinkled, mirror-finish synthetic leather and reducing production costs. Furthermore, the wrinkled, mirror-finish synthetic leather produced using the wrinkled, high-gloss release film provided by the present invention has a gloss of 90 to 100 GU, which is no less than that of wrinkled, mirror-finish synthetic leather produced by additional embossing, embossing, or rubbing steps. The method of the present invention not only ensures that the wrinkle mirror synthetic leather has high gloss, but also further simplifies the production process of the wrinkle mirror synthetic leather, improves production efficiency and saves production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the process for preparing a wrinkled high-gloss release film according to an embodiment of the present invention; Figure 2 This is an optical microscope image of the wrinkled release film prepared in Example 1; Figure 3 This is an optical microscope image of the wrinkled high-gloss release film prepared in Example 1. DETAILED DESCRIPTION

[0016] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0017] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0018] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first" and "second" mentioned in the present invention are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0019] In view of the problems existing in the above-mentioned related technologies, such as Figure 1 As shown, an embodiment of the present invention provides a method for preparing a wrinkled high-gloss release film, comprising: Step S1, coating a UV-curable release agent coating liquid on a substrate, performing a first UV irradiation treatment, and simultaneously performing embossing using a wrinkled mold roller to obtain a wrinkled layer; Step S2: coating the wrinkle layer with a brightening coating liquid, drying the wrinkle layer, and then subjecting the wrinkle layer to a second ultraviolet irradiation treatment to obtain a brightening layer on the wrinkle layer, thereby producing a wrinkle high-gloss release film.

[0020] The present invention provides a method for preparing a wrinkled, high-gloss release film. A UV-curable release agent coating liquid is applied to a substrate, and while undergoing a first UV-irradiation treatment, a wrinkled mold roller is used to emboss the coating during the UV-curing process to obtain a wrinkled layer. A brightening layer is then formed on the wrinkled layer, thereby producing a wrinkled, high-gloss release film. The wrinkled, high-gloss release film and the brightening layer together form the wrinkled, high-gloss release film. Experiments have shown that the wrinkled, high-gloss release film produced using the method of the present invention has a gloss greater than 150 GU. Using this wrinkled, high-gloss release film to produce wrinkled, mirror-finish synthetic leather reduces the production process steps of embossing, debossing, or rubbing, thereby improving the production efficiency and reducing production costs. Furthermore, the wrinkled, mirror-finish synthetic leather produced using the wrinkled, high-gloss release film provided by the present invention has a gloss of 90 to 100 GU, which is no less than that of wrinkled, mirror-finish synthetic leather produced by additional embossing, debossing, or rubbing steps.

[0021] In some embodiments of the present invention, in step S1, the UV-curable release agent coating solution comprises, by weight, 50 to 75 parts of an acrylate oligomer, 20 to 45 parts of a reactive diluent, 2 to 5 parts of a photoinitiator, and 0.5 to 2 parts of a silicone additive. Polyurethane acrylates offer excellent overall performance, exhibiting excellent wear resistance, flexibility, chemical resistance, and heat resistance after UV curing, as well as strong adhesion to plastic substrates such as PET. This gives the high-gloss wrinkle release film excellent overall performance. During the light-curing process, the silicone additive enhances release properties from wrinkle-coated mold rollers, preventing residual light-cured glue from remaining on the roller.

[0022] In some embodiments of the present invention, in step S1, the acrylate oligomer includes at least one of polyurethane acrylate and epoxy acrylate; the reactive diluent includes at least one of tetrahydrofuran methyl acrylate (THFA), 1,6-ethylene glycol diacrylate (HDDA) and neopentyl glycol diacrylate (NPGDA); the photoinitiator includes at least one of 1-hydroxy-cyclohexyl benzophenone (photoinitiator 184) and 2,4,6-trimethylbenzoyldiphenylphosphine oxide (photoinitiator TPO); and the organosilicon additive is an organosilicon oligomer.

[0023] In some embodiments of the present invention, in step S2, the components of the brightening coating liquid include, by weight: 5 to 10 parts of polyurethane acrylate, 1.5 to 2.5 parts of silicone polyurethane acrylate, 1 to 3 parts of acrylic acid reactive diluent, 0.5 to 1 part of photoinitiator, 0.1 to 0.25 parts of leveling agent, 30 to 40 parts of toluene, and 40 to 50 parts of ethyl acetate.

[0024] In some embodiments of the present invention, the acrylic reactive diluent includes at least one of isooctyl acrylate, hydroxyethyl acrylate, and isobornyl acrylate, and the leveling agent is a polyether-modified polysiloxane leveling agent.

[0025] In some embodiments of the present invention, in step S1, the ultraviolet energy used in the first ultraviolet irradiation treatment is 200 mJ / cm 2 Up to 1000mJ / cm 2 In step S2, the ultraviolet energy used in the second ultraviolet irradiation treatment is 100mJ / cm 2 Up to 500mJ / cm 2 .

[0026] An embodiment of the present invention further provides a wrinkled high-gloss release film, which adopts the above-mentioned method for preparing the wrinkled high-gloss release film.

[0027] An embodiment of the present invention also provides a method for preparing wrinkled mirror synthetic leather, comprising: sequentially coating a polyurethane surface layer, a polyurethane intermediate layer, and a polyurethane adhesive layer on the wrinkled high-gloss release film as described above, then laminating the polyurethane adhesive layer to a base fabric, and performing a heating and curing treatment to obtain wrinkled mirror synthetic leather.

[0028] The wrinkle mirror-finished synthetic leather produced using the method provided by the embodiments of the present invention has a glossiness of 90 to 100 GU, which is no less than that of wrinkle mirror-finished synthetic leather produced using additional embossing, embossing, or rubbing processes. The method of the embodiments of the present invention not only ensures a high gloss for the wrinkle mirror-finished synthetic leather, but also further simplifies the production process, improves production efficiency, and saves production costs.

[0029] In some embodiments of the present invention, the base fabric is a stretch fleece knitted fabric.

[0030] In some embodiments of the present invention, the temperature of the heating and curing treatment is 110° C. to 150° C., and the time is 3 min to 5 min.

[0031] An embodiment of the present invention further provides a wrinkle mirror synthetic leather, which is manufactured using the above-mentioned method for preparing wrinkle mirror synthetic leather.

[0032] The present invention is further described below with reference to specific examples. It should be noted that the aliphatic urethane acrylate 61438, aliphatic urethane acrylate 6135-100, and aliphatic urethane acrylate 6195-10 used in this invention are all manufactured by Changxing Chemical Industry Co., Ltd.; the silicone additive used in this invention is manufactured by Suzhou Unisichuang Materials Technology Co., Ltd., with product models M-1 or M-2; the silicone urethane acrylate is manufactured by Changxing Chemical Industry Co., Ltd., with product model DR-U187B; and the leveling agent is manufactured by BYK Chemical, with product model BYK-333. The glossiness used in this invention is the 60-degree glossiness measured using a gloss meter in accordance with GB / T 9754-2007.

[0033] Example 1 A1. Mix 30 parts of HDDA, 3 parts of photoinitiator 184, 2 parts of photoinitiator TPO, and 1 part of silicone additive, by weight, and stir evenly. Then add 40 parts of aliphatic polyurethane acrylate 61438 and 25 parts of aliphatic polyurethane acrylate 6135-100, stir evenly, and let stand for 10 minutes to defoam to obtain a UV-curable release agent coating liquid.

[0034] A2. In a UV-curing imprinting device, a UV-curable release agent coating liquid is coated on a PET substrate, subjected to a first UV-irradiation treatment, and imprinted using a wrinkled mold roller to obtain a wrinkled release film having a wrinkled layer; wherein the wrinkled layer has a thickness of 20 μm; and the UV energy used in the first UV-irradiation treatment is 500 mJ / cm 2 .

[0035] A3. Apply a brightening coating liquid to the wrinkle layer of the wrinkle release film, dry it, and then perform a second ultraviolet light irradiation treatment to obtain a brightening layer on the wrinkle layer, thereby producing a wrinkle high-gloss release film. The drying temperature is 90°C for 60 seconds; the thickness of the brightening layer is 2 μm; the brightening coating liquid comprises, by weight, 8 parts of polyurethane acrylate, 2 parts of silicone polyurethane acrylate, 2 parts of acrylic acid reactive diluent, 0.8 parts of photoinitiator, 0.2 parts of leveling agent, 35 parts of toluene, and 45 parts of ethyl acetate; the photoinitiator is photoinitiator 184; the second ultraviolet light irradiation treatment uses an ultraviolet light energy of 250 mJ / cm 2 After testing, the glossiness of the wrinkle high-gloss release film is 160GU.

[0036] A4. Coating a surface layer polyurethane slurry on a wrinkle high-gloss release film, performing a first drying and curing treatment to obtain a polyurethane surface layer; coating an intermediate layer polyurethane slurry on the polyurethane surface layer, performing a second drying and curing treatment to obtain a polyurethane intermediate layer; coating an adhesive layer polyurethane slurry on the polyurethane intermediate layer to obtain a polyurethane adhesive layer, and then laminating the polyurethane adhesive layer to a base fabric, performing heat curing treatment, and obtaining a wrinkle mirror synthetic leather; wherein the temperature of the first drying and curing treatment is 130°C, and the time is 3 minutes; the temperature of the second drying and curing treatment is 130°C, and the time is 3 minutes; the temperature of the heat curing treatment is 130°C, and the time is 4 minutes; and the base fabric is a stretch pile knitted fabric.

[0037] Comparative Example 1 D1. Mix 30 parts of HDDA, 3 parts of photoinitiator 184, 2 parts of photoinitiator TPO, and 1 part of silicone additive by weight, stir evenly, then add 40 parts of aliphatic polyurethane acrylate 61438 and 25 parts of aliphatic polyurethane acrylate 6135-100, stir evenly, and let stand for defoaming for 10 minutes to obtain a UV-curable release agent coating liquid.

[0038] D2. In a UV curing imprinting device, a UV curing release agent coating liquid is coated on a PET substrate, subjected to a first UV irradiation treatment, and imprinted using a wrinkled mold roller to obtain a wrinkled release film having a wrinkled layer; wherein the wrinkled layer has a thickness of 20 μm; the UV energy used in the first UV irradiation treatment is 500 mJ / cm 2 After testing, the glossiness of the wrinkle release film is 125GU.

[0039] D3. Coating a surface layer polyurethane slurry on the wrinkle release film, performing a first drying and curing treatment to obtain a polyurethane surface layer; coating an intermediate layer polyurethane slurry on the polyurethane surface layer, performing a second drying and curing treatment to obtain a polyurethane intermediate layer; coating an adhesive layer polyurethane slurry on the polyurethane intermediate layer to obtain a polyurethane adhesive layer, and then laminating the polyurethane adhesive layer to a base fabric, performing heat curing treatment, and obtaining a wrinkle synthetic leather; wherein the temperature of the first drying and curing treatment is 130°C, and the time is 3 minutes; the temperature of the second drying and curing treatment is 130°C, and the time is 3 minutes; the temperature of the heat curing treatment is 130°C, and the time is 4 minutes; and the base fabric is a stretch pile knitted fabric.

[0040] Example 2 A1. Mix 30 parts of HDDA, 3 parts of photoinitiator 184, 2 parts of photoinitiator TPO, and 1 part of silicone additive, by weight, and stir evenly. Then add 30 parts of aliphatic polyurethane acrylate 61438 and 35 parts of aliphatic polyurethane acrylate 6195-100, stir evenly, and let stand for 10 minutes to defoam to obtain a UV-curable release agent coating liquid.

[0041] A2. In a UV-curing imprinting device, a UV-curable release agent coating liquid is coated on a PET substrate, subjected to a first UV-irradiation treatment, and imprinted using a wrinkled mold roller to obtain a wrinkled release film having a wrinkled layer; wherein the wrinkled layer has a thickness of 30 μm; and the UV energy used in the first UV-irradiation treatment is 500 mJ / cm 2 .

[0042] A3. Apply a brightening coating liquid to the wrinkle layer of the wrinkle release film, dry it, and then irradiate it with ultraviolet light for a second time to form a brightening layer on the wrinkle layer, thereby producing a wrinkle high-gloss release film. The brightening layer has a thickness of 3 μm. The brightening coating liquid comprises, by weight, 10 parts polyurethane acrylate, 2.5 parts silicone polyurethane acrylate, 3 parts acrylic acid reactive diluent, 1 part photoinitiator, 0.25 parts leveling agent, 40 parts toluene, and 50 parts ethyl acetate. The photoinitiator is photoinitiator 184. The ultraviolet energy used in the second ultraviolet irradiation is 250 mJ / cm2 After testing, the glossiness of the wrinkle high-gloss release film is 155GU.

[0043] A4. Coating a surface layer polyurethane slurry on a wrinkle high-gloss release film, performing a first drying and curing treatment to obtain a polyurethane surface layer; coating an intermediate layer polyurethane slurry on the polyurethane surface layer, performing a second drying and curing treatment to obtain a polyurethane intermediate layer; coating an adhesive layer polyurethane slurry on the polyurethane intermediate layer to obtain a polyurethane adhesive layer, and then laminating the polyurethane adhesive layer to a base fabric, performing heat curing treatment, and obtaining a wrinkle mirror synthetic leather; wherein the temperature of the first drying and curing treatment is 150°C, and the time is 2 minutes; the temperature of the second drying and curing treatment is 150°C, and the time is 2 minutes; the temperature of the heat curing treatment is 150°C, and the time is 3 minutes; and the base fabric is a stretch pile knitted fabric.

[0044] Comparative Example 2 D1. Mix 30 parts of HDDA, 3 parts of photoinitiator 184, 2 parts of photoinitiator TPO, and 1 part of silicone additive by weight, stir evenly, then add 30 parts of aliphatic polyurethane acrylate 61438 and 35 parts of aliphatic polyurethane acrylate 6195-100, stir evenly, and let stand for defoaming for 10 minutes to obtain a UV-curable release agent coating liquid.

[0045] D2. In a UV curing imprinting device, a UV curing release agent coating liquid is coated on a PET substrate, subjected to a first UV irradiation treatment, and imprinted using a wrinkled mold roller to obtain a wrinkled release film having a wrinkled layer; wherein the wrinkled layer has a thickness of 30 μm; the UV energy used in the first UV irradiation treatment is 500 mJ / cm 2 After testing, the glossiness of the wrinkle release film is 120GU.

[0046] D3. Coating a surface layer polyurethane slurry on the wrinkle release film, performing a first drying and curing treatment to obtain a polyurethane surface layer; coating an intermediate layer polyurethane slurry on the polyurethane surface layer, performing a second drying and curing treatment to obtain a polyurethane intermediate layer; coating an adhesive layer polyurethane slurry on the polyurethane intermediate layer to obtain a polyurethane adhesive layer, and then laminating the polyurethane adhesive layer to a base fabric, performing heat curing treatment, and obtaining a wrinkle synthetic leather; wherein the temperature of the first drying and curing treatment is 150°C, and the time is 2 minutes; the temperature of the second drying and curing treatment is 150°C, and the time is 2 minutes; the temperature of the heat curing treatment is 150°C, and the time is 3 minutes; and the base fabric is a stretch pile knitted fabric.

[0047] Example 3 A1, 20 parts of HDDA, 10 parts of THFA, 3 parts of photoinitiator 184, 2 parts of photoinitiator TPO, 1 part of silicone auxiliary agent are mixed according to the weight fraction, stirred uniformly, then 30 parts of aliphatic polyurethane acrylate 61438, 20 parts of aliphatic polyurethane acrylate 6135-10 and 30 parts of aliphatic polyurethane acrylate 6195-100 are added, stirred uniformly, and left to stand for 10 min to defoam, to obtain a UV curing release agent coating liquid.

[0048] A2, the UV curing release agent coating liquid is coated on the PET substrate in the UV light curing embossing equipment, the first UV light irradiation treatment is carried out, and the embossing is carried out by using the mold roller with wrinkles to obtain the wrinkled release film with a wrinkled layer; wherein the thickness of the wrinkled layer is 25 μm; the UV light energy used in the first UV light irradiation treatment is 700 mJ / cm 2 .

[0049] A3, the brightening coating liquid is coated on the wrinkled layer of the wrinkled release film, and after the drying treatment, the second UV light irradiation treatment is carried out to obtain a brightening layer on the wrinkled layer, so as to prepare the wrinkled high-gloss release film. Wherein the thickness of the brightening layer is 1 μm; the components of the brightening coating liquid according to the weight fraction are composed of 10 parts of polyurethane acrylate, 2.5 parts of silicone polyurethane acrylate, 3 parts of acrylic active diluent, 1 part of photoinitiator, 0.25 parts of leveling agent, 40 parts of toluene and 50 parts of ethyl acetate; wherein the photoinitiator is photoinitiator 184; the UV light energy used in the second UV light irradiation treatment is 150 mJ / cm 2 . It is detected that the glossiness of the wrinkled high-gloss release film is 165 GU.

[0050] A4, the surface layer polyurethane slurry is coated on the wrinkled high-gloss release film, the first drying and curing treatment is carried out to obtain a polyurethane surface layer; the intermediate layer polyurethane slurry is coated on the polyurethane surface layer, the second drying and curing treatment is carried out to obtain a polyurethane intermediate layer; the adhesive layer polyurethane slurry is coated on the polyurethane intermediate layer to obtain a polyurethane adhesive layer, and then the polyurethane adhesive layer is laminated with the base cloth to obtain the wrinkled mirror surface synthetic leather after the heating and curing treatment; wherein the temperature of the first drying and curing treatment is 110℃, and the time is 3 min; the temperature of the second drying and curing treatment is 110℃, and the time is 3 min; the temperature of the heating and curing treatment is 110℃, and the time is 5 min; the base cloth is elastic raised knitted fabric.

[0051] Comparative Example 3 D1. Mix 20 parts of HDDA, 10 parts of THFA, 3 parts of photoinitiator 184, 2 parts of photoinitiator TPO, and 1 part of silicone additive, by weight, and stir evenly. Then add 30 parts of aliphatic polyurethane acrylate 61438, 20 parts of aliphatic polyurethane acrylate 6135-10, and 30 parts of aliphatic polyurethane acrylate 6195-100, stir evenly, and let stand for defoaming for 10 minutes to obtain a UV-curable release agent coating liquid.

[0052] D2. In a UV curing imprinting device, a UV curing release agent coating liquid is coated on a PET substrate, subjected to a first UV irradiation treatment, and imprinted using a wrinkled mold roller to obtain a wrinkled release film having a wrinkled layer; wherein the wrinkled layer has a thickness of 25 μm; the UV energy used in the first UV irradiation treatment is 700 mJ / cm 2 After testing, the glossiness of the wrinkle release film is 130GU.

[0053] D3. Coating a surface layer polyurethane slurry on the wrinkle release film, performing a first drying and curing treatment to obtain a polyurethane surface layer; coating an intermediate layer polyurethane slurry on the polyurethane surface layer, performing a second drying and curing treatment to obtain a polyurethane intermediate layer; coating an adhesive layer polyurethane slurry on the polyurethane intermediate layer to obtain a polyurethane adhesive layer, and then laminating the polyurethane adhesive layer to a base fabric, performing heat curing treatment, and obtaining a wrinkle synthetic leather; wherein the temperature of the first drying and curing treatment is 110°C, and the time is 3 minutes; the temperature of the second drying and curing treatment is 110°C, and the time is 3 minutes; the temperature of the heat curing treatment is 110°C, and the time is 5 minutes; and the base fabric is a stretch pile knitted fabric.

[0054] Comparative Example 4 A surface polyurethane slurry is coated on a high-gloss PET mirror film and subjected to a first drying and curing treatment to obtain a polyurethane surface layer; an intermediate polyurethane slurry is coated on the polyurethane surface layer and subjected to a second drying and curing treatment to obtain a polyurethane intermediate layer; a bonding polyurethane slurry is coated on the polyurethane intermediate layer to obtain a polyurethane bonding layer, and the polyurethane bonding layer is then laminated to a base fabric and heat-cured to obtain a mirror-finished synthetic leather semi-finished product; the mirror-finished synthetic leather semi-finished product is immersed in 40°C water and rolled to a moisture content of 30%, and then placed on an 80°C kneading roller for 20 minutes while kneading and drying to obtain wrinkled mirror-finished synthetic leather. The high-gloss PET mirror film has a thickness of 20 μm, the first drying and curing treatment is performed at a temperature of 130°C for 3 minutes, the second drying and curing treatment is performed at a temperature of 130°C for 3 minutes, and the heat-curing treatment is performed at a temperature of 130°C for 4 minutes; and the base fabric is a stretch fleece knitted fabric.

[0055] Experimental example The wrinkle release film and the wrinkle high-gloss release film prepared in Example 1 were respectively subjected to optical microscope characterization, and the results are shown in Figure 2 and Figure 3 From Figure 2 and Figure 3 It can be seen that, compared with the wrinkle release film prepared in Example 1, the surface of the wrinkle high-gloss release film prepared in Example 1 is smoother, which means that the wrinkle high-gloss release film has higher gloss. The gloss of the synthetic leather finally prepared in Example 1 to Example 3 and Comparative Example 1 to Comparative Example 4 was detected, and the results are shown in Table 1. It can be seen from Table 1 that, compared with Comparative Example 1 to Comparative Example 3, the synthetic leather prepared in Example 1 to Example 3 has higher gloss. Compared with Comparative Example 4, the wrinkle mirror synthetic leather produced by using the wrinkle high-gloss release film provided by the embodiments of the present application can ensure that the wrinkle mirror synthetic leather has higher gloss, further simplifies the production process of the wrinkle mirror synthetic leather, improves the production efficiency, and saves the production cost.

[0056] Table 1

[0057] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications shall fall within the protection scope of the present application.

Claims

1. A method for preparing a wrinkled high-gloss release film, characterized in that: include: Step S1, coating a UV-curable release agent coating liquid on a substrate, performing a first UV irradiation treatment, and simultaneously performing embossing using a wrinkled mold roller to obtain a wrinkled layer; Step S2: coating the wrinkle layer with a brightening coating liquid, drying the wrinkle layer, and then subjecting the wrinkle layer to a second ultraviolet irradiation treatment to obtain a brightening layer on the wrinkle layer, thereby producing a wrinkle high-gloss release film.

2. The method for preparing a wrinkled high-gloss release film according to claim 1, wherein: In step S1, the components of the UV-curable release agent coating liquid include, by weight, 50 to 75 parts of acrylate oligomer, 20 to 45 parts of reactive diluent, 2 to 5 parts of photoinitiator, and 0.5 to 2 parts of silicone additive.

3. The method for preparing a wrinkled high-gloss release film according to claim 2, wherein: In step S1, the acrylate oligomer includes at least one of polyurethane acrylate and epoxy acrylate; the reactive diluent includes at least one of tetrahydrofuran methyl acrylate, 1,6-ethylene glycol diacrylate and neopentyl glycol diacrylate; the photoinitiator includes at least one of 1-hydroxy-cyclohexyl benzophenone and 2,4,6-trimethylbenzoyldiphenylphosphine oxide; and the organosilicon additive is an organosilicon oligomer.

4. The method for preparing a wrinkled high-gloss release film according to claim 1, wherein: In step S2, the components of the brightening coating liquid include, by weight: 5 to 10 parts of polyurethane acrylate, 1.5 to 2.5 parts of silicone polyurethane acrylate, 1 to 3 parts of acrylic acid reactive diluent, 0.5 to 1 part of photoinitiator, 0.1 to 0.25 parts of leveling agent, 30 to 40 parts of toluene, and 40 to 50 parts of ethyl acetate.

5. The method for preparing a wrinkled high-gloss release film according to claim 4, wherein: The acrylic acid reactive diluent includes at least one of isooctyl acrylate, hydroxyethyl acrylate and isobornyl acrylate.

6. The method for preparing a wrinkled high-gloss release film according to claim 1, wherein: In step S1, the ultraviolet energy used in the first ultraviolet irradiation treatment is 200 mJ / cm 2 Up to 1000mJ / cm 2 In step S2, the ultraviolet energy used in the second ultraviolet irradiation treatment is 100mJ / cm 2 Up to 500mJ / cm 2 .

7. A wrinkled high-gloss release film, characterized in that: The wrinkled high-gloss release film is prepared by the preparation method of any one of claims 1 to 6.

8. A method for preparing wrinkle mirror synthetic leather, characterized in that: include: A polyurethane surface layer, a polyurethane middle layer and a polyurethane adhesive layer are sequentially coated on the wrinkled high-gloss release film according to claim 7; The polyurethane adhesive layer is laminated to the base fabric, and subjected to heat curing treatment to obtain wrinkle mirror synthetic leather.

9. The method for preparing wrinkle mirror synthetic leather according to claim 8, wherein: The temperature of the heating and curing treatment is 110° C. to 150° C., and the time is 3 minutes to 5 minutes.

10. A wrinkle mirror synthetic leather, characterized in that: The wrinkle mirror synthetic leather is made by the preparation method of any one of claims 8 to 9.

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