Texture transfer film and preparation method thereof

Abstract

The invention relates to the technical field of film materials, and discloses a texture transfer film and a preparation method thereof.The texture transfer film comprises a base material film and a texture layer; the texture layer is formed by UV curing of transfer printing glue coated on the surface of the base material layer, the base material film is prepared by taking PET as a main raw material and mixing and extruding with auxiliary materials such as functional enhancing components and the like, the functional enhancing components are prepared by modifying organic antioxidant molecules on the surfaces of mullite fibers, and the functional enhancing components are prepared by ultraviolet curing. Wherein an organic antioxidant molecule is a macromolecular substance with a hindered phenol block link structure, and a rigid benzene ring in the hindered phenol structure can generate pi-pi conjugation with a PET matrix, so that the compatibility between the mullite fiber and the PET matrix is greatly improved, and the advantages of the mullite fiber are utilized, so that the anti-aging performance of the mullite fiber is improved. The prepared base material film has excellent mechanical strength performance, and meanwhile, the oxidation resistance of the base material film is effectively enhanced by utilizing the advantages of antioxidant molecules.

Description

Technical Field

[0001] The invention relates to the technical field of film materials, and in particular to a texture transfer film and a preparation method thereof. Background Art

[0002] Texture transfer film is a special thin film material. Through a specific transfer technology, the texture pattern on the film can be transferred to the surface of the target object, thus giving the target object beauty, durability and special visual effects. Texture transfer film has a wide range of applications, covering many fields such as automotive interiors, electronic products, furniture decoration, and toy manufacturing. In particular, with the continuous development of information technology in recent years, the continuous upgrading of smart terminals such as mobile phones and tablets, the design of product appearance has gradually become the key to attracting consumers. Texture film can realize the refraction of light waves through texture, greatly improving the appearance of the product. Appearance attractiveness, therefore, has been widely welcomed.

[0003] The transfer process actually involves transferring the transfer glue to the surface of an object through the transfer process, so that the object has a visual effect with a special pattern, which increases the aesthetics and breaks through the limitations of traditional printing and spraying processes. At present, texture transfer films generally include a substrate layer and a colloid layer. During construction, the colloid layer is adhered to the surface of the object by vacuuming or heating, and then the substrate layer is torn off to replicate the texture pattern on the surface of the object. At present, texture transfer films mainly use PET as the substrate layer. However, PET itself has poor aging resistance, and aging is inevitable during long-term storage. As a result, the texture transfer film and the colloid layer produce bubbles and hollows during long-term storage, resulting in the inability of the ultraviolet light source to evenly penetrate the substrate layer during subsequent construction, resulting in poor texture effects. Therefore, it is of great significance to modify PET. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a texture transfer film and a preparation method thereof.

[0005] (II) Technical solution A method for preparing a texture transfer film, the texture transfer film comprising a substrate film and a texture layer; the texture layer is formed by UV curing a transfer glue coated on the surface of the substrate layer; The substrate film is made of the following raw materials measured in parts by weight: 65-72 parts of PET, 5-10 parts of styrene-maleic anhydride copolymer, 3-6 parts of inorganic filler, 1.5-2.5 parts of functional reinforcing component, 0.5-1 part of lubricant; The preparation method comprises the following steps: Step 1: Wind the base film on the transition roller, pass it through the gap between the extrusion rubber roller and the texture transfer roller, connect it through the laminating and winding equipment, and carry out the base film conveying process; Step 2: Turn on the metering pump to evenly coat the transfer adhesive on the surface of the substrate film, and then transfer the transfer adhesive to the surface of the substrate film by rolling the extrusion adhesive roller and the texture transfer roller at the same time to form an adhesive film; Step 3: UV curing the film to obtain a texture transfer film.

[0006] As a further embodiment of the present invention, the method for preparing the substrate film comprises the following steps: Step S1, weighing the raw materials of each component according to the weight parts and setting aside; Step S2, adding each component to a mixer, and adjusting the temperature to 100-120°C, adjusting the screw speed to 500-1000r / min, mechanically stirring and mixing for 0.5-1h, then raising the temperature to 130-150°C, stirring for 2-3h, and finally transferring to an extruder, setting the temperature of each zone in sequence: zone 1 240-245°C, zone 2 245-250°C, zone 3 255-260°C, zone 4 255-260°C, zone 5 255-260°C, zone 6 250-255°C, after melt extrusion, making it into a sheet through a die head, and obtaining a substrate film.

[0007] As a further embodiment of the present invention, the inorganic filler is at least one of calcium carbonate, talc, titanium dioxide or silicon dioxide; and the lubricant is stearic acid or calcium stearate.

[0008] As a further embodiment of the present invention, the method for preparing the functional enhancement component comprises the following steps: Step SS1, dispersing the mullite fiber in 60-70% ethanol by volume, then adding the epoxy silane coupling agent, stirring and mixing evenly, then raising the temperature to 70-80°C, keeping the temperature and stirring for 4-8 hours, cooling and discharging the material, separating the solid material, and obtaining the epoxy-modified mullite fiber; Step SS2, mixing the epoxy-modified mullite fiber with tetrahydrofuran, and evenly dispersing them by ultrasonication, then adding the reactive antioxidant and tetrabutylammonium bromide to the formed dispersion, after the addition, adjusting the temperature to 60-65°C, stirring continuously for 12-24 hours, cooling and discharging the material, collecting the solid material by centrifugation, washing and vacuum drying, and then obtaining the functional enhancement component.

[0009] As a further embodiment of the present invention, in step SS1, the epoxy silane coupling agent is 3-glycidyloxypropyltrimethoxysilane or 3-glycidyloxypropyltriethoxysilane.

[0010] As a further embodiment of the present invention, in step SS2, the specific preparation method of the reactive antioxidant comprises the following steps: Step SSS1, adding antioxidant GM to chloroform, stirring, stirring and dissolving, adding 1-thioglycerol to the formed mixed solution, stirring evenly after the addition, continuing to add photoinitiator to the mixed solution, evacuating, passing nitrogen, and then irradiating with ultraviolet light for 1-2 hours, separating the product, and obtaining an antioxidant intermediate; Step SSS2, add the antioxidant intermediate to toluene, start stirring, stir until a uniform solution is formed, then add sodium hydroxide aqueous solution to the solution, increase the temperature to 50-60°C, stir for 2-4 hours, then add the bridge body, after the addition, continue to increase the temperature to 80-90°C, continue stirring for 8-16 hours, separate the product, and the reactive antioxidant can be obtained.

[0011] As a further embodiment of the present invention, in step SSS1, the photoinitiator is 2,2-dimethoxy-2-phenylacetophenone.

[0012] As a further embodiment of the present invention, in step SSS2, the molar ratio of the antioxidant intermediate to the bridge is 1:0.8-1.

[0013] As a further embodiment of the present invention, in step SSS2, the bridge body is 1,2-bis(2-bromoethoxy)ethane or 1,2-bis(2-chloroethoxy)ethane.

[0014] In the above technical scheme, antioxidant GM and 1-thioglycerol are first used as raw materials, and a hindered phenol antioxidant intermediate containing two equivalents of active hydroxyl groups in the structure is obtained through a click reaction. Then, it is activated using sodium hydroxide, and then continuously substituted with the halogen substituents in the bridge structure. By controlling the amount of materials used, a macromolecular reactive antioxidant with active hydroxyl groups at the ends of the structure is obtained.

[0015] Next, under the catalytic action of phase transfer catalyst tetrabutylammonium bromide, the ring-opening addition reaction of hydroxyl and epoxy groups is utilized, and a reactive antioxidant is used to modify the surface of the epoxy-modified mullite fiber, thereby modifying the organic antioxidant molecules on the surface of the mullite fiber to obtain a functional enhancement component.

[0016] A texture transfer film is prepared by adopting the above preparation method.

[0017] 3. Beneficial technical effects The present invention obtains a functional enhancement component by modifying an organic antioxidant molecule on the surface of a mullite fiber, wherein the organic antioxidant molecule is a macromolecular substance having a hindered phenol block linking structure, and since the rigid benzene ring in the hindered phenol structure can produce π-π conjugation with a PET matrix, the compatibility between the mullite fiber and the PET matrix is ​​greatly improved, and the advantages of the mullite fiber are utilized to make the obtained substrate film have excellent mechanical strength performance, and in addition, the organic antioxidant molecular structure also contains a large number of ether bonds, which can make the bonding effect between the substrate film and the transfer adhesive better. In addition, the presence of the organic antioxidant molecule can greatly improve the antioxidant effect of the substrate film, and prevent the problem of aging during storage causing construction difficulties. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 This is the infrared analysis test diagram of reactive antioxidant. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more fully below. Preferred embodiments of the present invention are given below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0021] Preparation Example 1 Preparation of functional enhancing components: Step SS1, dispersing 2.5g of mullite fiber in 70% ethanol by volume, then adding 4g of 3-glycidyloxypropyltriethoxysilane, stirring and mixing evenly, then raising the temperature to 75°C, keeping the temperature and stirring for 6h, cooling and discharging, separating the solid material, and obtaining epoxy-modified mullite fiber; Step SS2, 1.8g of epoxy-modified mullite fiber is mixed with tetrahydrofuran, and after ultrasonic dispersion, 5g of reactive antioxidant and 0.1g of tetrabutylammonium bromide are added to the formed dispersion. After the addition is completed, the temperature is adjusted to 65°C, and stirring is continued for 18 hours. The material is cooled and discharged, and the solid material is collected by centrifugation. After washing and vacuum drying, the functional enhancement component can be obtained.

[0022] The specific preparation method of the reactive antioxidant comprises the following steps: Step SSS1, add 1.2 g of antioxidant GM to chloroform, start stirring, stir and dissolve thoroughly, add 0.33 g of 1-thioglycerol to the formed mixed solution, stir evenly after the addition, continue to add 0.01 g of 2,2-dimethoxy-2-phenylacetophenone to the mixed solution, evacuate, pass nitrogen, and then irradiate with ultraviolet light for 1.5 hours, separate the product, and obtain an antioxidant intermediate; Step SSS2, add 0.8 g of the antioxidant intermediate to toluene, start stirring, stir until a uniform solution is formed, then add 20 mL of a 20% mass fraction of sodium hydroxide aqueous solution to the solution, increase the temperature to 60°C, stir for 3 hours, and then add 0.4 g of 1,2-bis(2-bromoethoxy)ethane. After the addition is completed, continue to increase the temperature to 90°C, continue stirring for 12 hours, separate the product, and the reactive antioxidant can be obtained.

[0023] Figure 1 This is the infrared analysis test chart of the reactive antioxidant. The test results show that 3324cm -1 The characteristic absorption peak of hydroxyl appeared at 2900-3000cm -1 The characteristic absorption peaks of carbon and hydrogen of methyl and methylene appeared at 1730cm -1 The C=O characteristic absorption peak of the ester group appeared at 1075 cm -1 The characteristic absorption peak of ether bond appeared at 941cm -1 The CS characteristic absorption peak appeared at . Example 1

[0024] Preparation method of substrate film: Step S1, weighing 65 parts of PET, 5 parts of styrene-maleic anhydride copolymer, 3 parts of calcium carbonate, 1.5 parts of functional enhancement components, and 0.5 parts of calcium stearate according to weight parts, and set aside; Step S2, add each component to a mixer, and adjust the temperature to 100°C, adjust the screw speed to 500r / min, mechanically stir and mix for 0.5h, then raise the temperature to 130°C, stir for 2h, and finally transfer to an extruder, set the temperature of each zone as follows: zone 1 240°C, zone 2 245°C, zone 3 255°C, zone 4 255°C, zone 5 255°C, zone 6 250°C, after melt extrusion, make it into a sheet through a die head, and obtain a substrate film.

[0025] The preparation method of the functional enhancement component is shown in Preparation Example 1, and the same is true for the following. Example 2

[0026] Preparation method of substrate film: Step S1, weighing 68 parts of PET, 6 parts of styrene-maleic anhydride copolymer, 5 parts of talc, 2.4 parts of functional enhancement components, and 0.6 parts of stearic acid according to weight parts, and set aside; Step S2, adding each component to a mixer, and adjusting the temperature to 120°C, adjusting the screw speed to 800r / min, mechanically stirring and mixing for 1h, then raising the temperature to 140°C, stirring for 3h, and finally transferring to an extruder, setting the temperatures of each zone as follows: zone 1 240°C, zone 2 250°C, zone 3 260°C, zone 4 260°C, zone 5 260°C, zone 6 250°C, after melt extrusion, making it into a sheet through a die head, and obtaining a substrate film. Example 3

[0027] Preparation method of substrate film: Step S1, weighing 72 parts of PET, 10 parts of styrene-maleic anhydride copolymer, 6 parts of talcum powder, 2.5 parts of functional enhancement components, and 1 part of stearic acid according to weight parts, and set aside; Step S2, adding each component to a mixer, and adjusting the temperature to 120°C, adjusting the screw speed to 1000r / min, mechanically stirring and mixing for 1h, then raising the temperature to 150°C, stirring for 3h, and finally transferring to an extruder, setting the temperatures of each zone as follows: zone 1 240°C, zone 2 250°C, zone 3 260°C, zone 4 260°C, zone 5 260°C, zone 6 250°C, after melt extrusion, making it into a sheet through a die head, and obtaining a substrate film.

[0028] Comparative Example 1 Preparation method of substrate film: Step S1, weigh 68 parts of PET, 6 parts of styrene-maleic anhydride copolymer, 5 parts of talcum powder, 2.4 parts of mullite fiber, and 0.6 parts of stearic acid according to weight parts, and set aside; Step S2, adding each component to a mixer, and adjusting the temperature to 120°C, adjusting the screw speed to 800r / min, mechanically stirring and mixing for 1h, then raising the temperature to 140°C, stirring for 3h, and finally transferring to an extruder, setting the temperatures of each zone as follows: zone 1 240°C, zone 2 250°C, zone 3 260°C, zone 4 260°C, zone 5 260°C, zone 6 250°C, after melt extrusion, making it into a sheet through a die head, and obtaining a substrate film.

[0029] Comparative Example 2 Preparation method of substrate film: Step S1, weighing 68 parts of PET, 6 parts of styrene-maleic anhydride copolymer, 5 parts of talc, 2.4 parts of reactive antioxidant, and 0.6 parts of stearic acid according to weight parts, and set aside; Step S2, adding each component to a mixer, and adjusting the temperature to 120°C, adjusting the screw speed to 800r / min, mechanically stirring and mixing for 1h, then raising the temperature to 140°C, stirring for 3h, and finally transferring to an extruder, setting the temperatures of each zone as follows: zone 1 240°C, zone 2 250°C, zone 3 260°C, zone 4 260°C, zone 5 260°C, zone 6 250°C, after melt extrusion, making it into a sheet through a die head, and obtaining a substrate film.

[0030] The preparation method of the reactive antioxidant is shown in Preparation Example 1.

[0031] Test Case According to the standard GB.T 1040.2-2022, the tensile performance test was carried out; after the test, the samples of the same batch were placed in an oven at 100°C for accelerated aging for 24 hours, then taken out and subjected to the same tensile performance test to evaluate their aging resistance. The test results are recorded in the following table:

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0033] Based on the ideal embodiment of the present invention, through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A method for preparing a texture transfer film, characterized in that: The texture transfer film comprises a substrate film and a texture layer; the texture layer is formed by UV curing a transfer glue coated on the surface of the substrate layer; The substrate film is made of the following raw materials measured in parts by weight: 65-72 parts of PET, 5-10 parts of styrene-maleic anhydride copolymer, 3-6 parts of inorganic filler, 1.5-2.5 parts of functional reinforcing component, 0.5-1 part of lubricant; The preparation method comprises the following steps: Step 1: Wind the base film on the transition roller, pass it through the gap between the extrusion rubber roller and the texture transfer roller, connect it through the laminating and winding equipment, and carry out the base film conveying process; Step 2: Turn on the metering pump to evenly coat the transfer adhesive on the surface of the substrate film, and then transfer the transfer adhesive to the surface of the substrate film by rolling the extrusion adhesive roller and the texture transfer roller at the same time to form an adhesive film; Step 3: UV curing the film to obtain a texture transfer film.

2. The method for preparing a texture transfer film according to claim 1, characterized in that: The method for preparing the substrate film comprises the following steps: Step S1, weighing each component raw material according to weight and setting aside; Step S2, adding each component to a mixer, and adjusting the temperature to 100-120°C, adjusting the screw speed to 500-1000r / min, mechanically stirring and mixing for 0.5-1h, then raising the temperature to 130-150°C, stirring for 2-3h, and finally transferring to an extruder, setting the temperature of each zone in sequence: zone 1 240-245°C, zone 2 245-250°C, zone 3 255-260°C, zone 4 255-260°C, zone 5 255-260°C, zone 6 250-255°C, after melt extrusion, making it into a sheet through a die head, and obtaining a substrate film.

3. The method for preparing a texture transfer film according to claim 1, characterized in that: The inorganic filler is at least one of calcium carbonate, talc, titanium dioxide or silicon dioxide; the lubricant is stearic acid or calcium stearate.

4. The method for preparing a texture transfer film according to claim 1, characterized in that: The preparation method of the functional enhancement component comprises the following steps: Step SS1, using an epoxy silane coupling agent to modify the surface of the mullite fiber to obtain epoxy-modified mullite fiber; Step SS2: Use a reactive antioxidant to further modify the surface of the epoxy-modified mullite fiber to obtain a functional reinforcement component.

5. The method for preparing a texture transfer film according to claim 4, characterized in that: In the step SS1, the epoxy silane coupling agent is 3-glycidyloxypropyltrimethoxysilane or 3-glycidyloxypropyltriethoxysilane.

6. The method for preparing a texture transfer film according to claim 4, characterized in that: In step SS2, the specific preparation method of the reactive antioxidant comprises the following steps: Step SSS1, adding antioxidant GM to chloroform, stirring, stirring and dissolving, adding 1-thioglycerol to the formed mixed solution, stirring evenly after the addition, continuing to add photoinitiator to the mixed solution, evacuating, passing nitrogen, and then irradiating with ultraviolet light for 1-2 hours, separating the product, and obtaining an antioxidant intermediate; Step SSS2, add the antioxidant intermediate to toluene, start stirring, stir until a uniform solution is formed, then add sodium hydroxide aqueous solution to the solution, increase the temperature to 50-60°C, stir for 2-4 hours, then add the bridge body, after the addition, continue to increase the temperature to 80-90°C, continue stirring for 8-16 hours, separate the product, and the reactive antioxidant can be obtained.

7. The method for preparing a texture transfer film according to claim 6, characterized in that: In the step SSS1, the photoinitiator is 2,2-dimethoxy-2-phenylacetophenone.

8. The method for preparing a texture transfer film according to claim 6, characterized in that: In the step SSS2, the molar ratio of the antioxidant intermediate to the bridge is 1:0.8-1.

9. The method for preparing a texture transfer film according to claim 6, characterized in that: In the step SSS2, the bridge body is 1,2-bis(2-bromoethoxy)ethane or 1,2-bis(2-chloroethoxy)ethane.

10. A texture transfer film, characterized in that: The method is prepared according to any one of claims 1 to 9.

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