Panel transfer film, method of making and use thereof

Abstract

The application provides a plate transfer film and a preparation method and application thereof, and relates to the technical field of plate transfer film preparation. The plate transfer film comprises, from top to bottom, an upper surface layer, a core layer and a lower surface layer; the upper surface layer comprises the following components in a mass ratio: 89-91 parts of polypropylene, 1.1-6.3 parts of an antistatic agent and 0.2-0.5 parts of a slip agent; the core layer comprises the following components in a mass ratio: 40-70 parts of high-density polyethylene, 2-15 parts of a matting agent, 1-3 parts of a dispersing agent and 0.1-1.0 parts of an antioxidant; and the lower surface layer comprises the following components in a mass ratio: 95-97 parts of polypropylene and 3.0-5.0 parts of polymethyl acrylate. The plate transfer film is attached to a PETG plate at 175-185 DEG C to prepare a PETG plate, and the gloss value of the PETG plate is 35-42 %.

Description

Technical Field

[0001] This invention relates to the field of transfer film preparation technology for sheet materials, specifically to a sheet material transfer film, its preparation method, and its application. Background Technology

[0002] As people's living standards improve, their aspirations for a better life become more urgent. Therefore, they have higher demands for aesthetics and comfort in home decoration. PETG is a transparent, non-crystalline copolyester, a thermoplastic polyester material formed by the esterification of ethylene glycol, terephthalic acid, and malonic acid. It possesses excellent durability and impact resistance, remaining intact for extended periods under high-intensity and high-pressure environments. This makes PETG an ideal material for manufacturing architectural decorative panels, such as wall panels, ceilings, partitions, doors, and windows.

[0003] However, PETG sheets have a high gloss, which can cause some damage to the human eye after reflection and may also cause dizziness. Secondly, when some imperfections appear on the high-gloss surface, such as minor scratches, grease contamination, dust accumulation and fingerprints, it will also affect its appearance. These factors have led to the demand for low gloss PETG sheets. Therefore, how to reduce the gloss of PETG sheets has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a transfer film for PETG sheets, its preparation method, and its application, solving the technical problem of achieving high gloss in PETG sheets.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A transfer film for sheet materials, comprising, from top to bottom, an upper surface layer, a core layer, and a lower surface layer;

[0009] The upper surface layer comprises the following components in the following mass ratio: 89-91 parts polypropylene, 1.1-6.3 parts antistatic agent, and 0.2-0.5 parts slip agent;

[0010] The core layer comprises the following components in the following mass ratio: 40-70 parts high-density polyethylene, 2-15 parts matting agent, 1-3 parts dispersant, and 0.1-1.0 parts antioxidant;

[0011] The lower surface layer comprises the following components in the following mass ratio: 95-97 parts polypropylene and 3.0-5.0 parts polymethyl methacrylate.

[0012] Preferably, the matting material includes silica-based matting powder.

[0013] Preferably, the silica-based matting agent includes precipitated silica matting agent.

[0014] Preferably, the silica-based matting powder has a pore volume of 1.2-1.8 mL / g and a particle size of 1.5-2.5 μm.

[0015] Preferably, the matting material further includes an organic matting agent, wherein the particle size d50 ranges from 3.5 to 8.5 μm and the d90 ranges from 9.0 to 19.0 μm.

[0016] Preferably, the upper surface layer further includes fluoroplastic 46, and the upper surface layer comprises the following components in the following mass ratio: 49-51 parts polypropylene, 40-48 parts fluoroplastic 46, 1.1-6.3 parts antistatic agent, and 0.2-0.5 parts slip agent.

[0017] On the other hand, a method for preparing a plate transfer film includes the following steps:

[0018] (1) Prepare the raw materials for the upper surface layer, core layer and lower surface layer respectively;

[0019] (2) The upper surface layer, core layer and lower surface layer raw materials are extruded simultaneously from one die through three flow channels to form a thick sheet;

[0020] (3) The thick sheet is subjected to longitudinal stretching and transverse stretching processes in sequence to form a thin film;

[0021] (4) After cooling the film at a temperature of 40-45℃, a plate transfer film is obtained.

[0022] Preferably, the longitudinal stretching process is as follows: preheating temperature is 110-120℃, stretching temperature is 90-100℃, stretching ratio is 4.8-5.0, and setting temperature is 120-130℃.

[0023] Preferably, the transverse stretching process is as follows: preheating temperature is 130-140℃, stretching temperature is 125-135℃, stretching ratio is 7-9, and setting temperature is 135-145℃.

[0024] On the other hand, an application of a plate transfer film in the preparation of PETG plates involves bonding the plate transfer film to a PETG plate at 175°C-185°C to obtain a PETG plate with a gloss value of 35-42%.

[0025] (III) Beneficial Effects

[0026] This invention provides a plate transfer film, its preparation method, and its application. Compared with the prior art, it has the following advantages:

[0027] This invention discloses a transfer film for sheet materials comprising an upper surface layer, a core layer, and a lower surface layer. The core layer is prepared by adding a matting agent to high-density polyethylene (HDPE). The addition of the matting agent to HDPE creates a heterogeneous film, resulting in inconsistent refractive indices in different micro-regions of the core layer. This reduces the intensity of reflected light from the core layer, thereby achieving a matting effect in the transfer film. Furthermore, during the cooling process in the preparation of the transfer film, the tiny particles of the matting agent create micro-roughness in the core layer. By setting the matting agent to be silica-based matting powder with a particle size of 1.5-2.5 μm and an organic matting agent with a particle size d50 range of 3.5-8.5 μm, the gradient distribution of particle size further enhances the micro-roughness of the core layer, reducing light reflection and increasing scattered light, thus achieving a matting effect in the transfer film.

[0028] The upper surface of the transfer film of the plate in this invention application includes polypropylene and fluoroplastic 46. The critical surface tensions of polypropylene and fluoroplastic 46 are 342 μN / cm and 175 μN / cm, respectively. The difference in critical surface tension between the two causes the upper surface layer to shrink appropriately under the cooling conditions during the preparation process, increasing the roughness of the upper surface layer, thereby achieving the matting effect of the plate transfer film.

[0029] Then, the transfer film is laminated onto the PETG board at 175℃-185℃ to prepare the PETG board, thereby making the gloss value of the PETG board 35-42%. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] To better understand the above technical solution, the following will provide a detailed explanation of the technical solution in conjunction with specific implementation methods.

[0032] Example 1:

[0033] This embodiment provides a method for preparing a transfer film on a substrate, comprising the following steps:

[0034] (1) Prepare the raw materials for the upper surface layer, core layer and lower surface layer respectively;

[0035] The upper surface layer comprises the following components in the following mass ratio: 49 parts polypropylene, 46-40 parts fluoroplastic, 1.1 parts antistatic agent, and 0.2 parts slip agent;

[0036] The core layer comprises the following components in the following mass ratio: 40 parts high-density polyethylene, 2 parts matting agent, 1 part dispersant, and 0.1 parts antioxidant. The matting agent is a mixture of precipitated silica matting powder and Pergopak organic matting agent, with a mixing ratio of 1:0.5. The organic matting agent has a particle size range of d50 of 3.5 μm and d90 of 9.0 μm. The silica matting powder has a pore volume of 1.2 mL / g and a particle size of 1.5 μm.

[0037] The lower layer comprises the following components in the following mass ratio: 95 parts polypropylene and 5.0 parts polymethacrylate.

[0038] (2) The raw materials of the upper surface layer, core layer and lower surface layer are melted at 180°C and then extruded simultaneously from one die through three channels to form a thick sheet;

[0039] (3) The thick sheet is subjected to longitudinal stretching and transverse stretching in sequence. The longitudinal stretching process is as follows: the preheating temperature is 110℃, the stretching temperature is 90℃, the stretching ratio is 4.8, and the setting temperature is 120℃. The transverse stretching process is as follows: the preheating temperature is 130℃, the stretching temperature is 125℃, the stretching ratio is 7, and the setting temperature is 135℃ to form a film.

[0040] (4) After cooling the film at a temperature of 40°C, a plate transfer film is obtained.

[0041] The PETG sheet was prepared by laminating the transfer film onto a commercially available PETG sheet at a lamination temperature of 175°C.

[0042] Example 2

[0043] This embodiment provides a method for preparing a transfer film on a substrate, comprising the following steps:

[0044] (1) Prepare the raw materials for the upper surface layer, core layer and lower surface layer respectively;

[0045] The upper surface layer comprises the following components in the following mass ratio: 50 parts polypropylene, 46-45 parts fluoroplastic, 3 parts antistatic agent, and 0.3 parts slip agent;

[0046] The core layer comprises the following components in the following mass ratio: 50 parts high-density polyethylene, 8 parts matting agent, 2 parts dispersant, and 0.5 parts antioxidant;

[0047] The matting agent is a mixture of precipitated silica matting powder and organic matting agent. The mixing ratio of precipitated silica matting powder and organic matting agent is 1:0.8. The particle size of the organic matting agent is d50 in the range of 5μm and d90 in the range of 15μm. The pore volume of the silica matting powder is 1.5mL / g and the particle size is 2μm.

[0048] The lower layer comprises the following components in the following mass ratio: 96 parts polypropylene and 4 parts polymethacrylate.

[0049] (2) The raw materials of the upper surface layer, core layer and lower surface layer are melted at 190°C and then extruded simultaneously from one die through three channels to form a thick sheet;

[0050] (3) The thick sheet is subjected to longitudinal stretching and transverse stretching in sequence. The longitudinal stretching process is as follows: the preheating temperature is 115℃, the stretching temperature is 95℃, the stretching ratio is 4.8, and the setting temperature is 125℃. The transverse stretching process is as follows: the preheating temperature is 135℃, the stretching temperature is 130℃, the stretching ratio is 8, and the setting temperature is 140℃ to form a film.

[0051] (4) After cooling the film at a temperature of 45°C, a plate transfer film is obtained.

[0052] The PETG sheet is prepared by laminating the transfer film onto a commercially available PETG sheet at a lamination temperature of 180℃.

[0053] Example 3

[0054] This embodiment provides a method for preparing a transfer film on a substrate, comprising the following steps:

[0055] (1) Prepare the raw materials for the upper surface layer, core layer and lower surface layer respectively;

[0056] The upper surface layer comprises the following components in the following mass ratio: 51 parts polypropylene, 46-48 parts fluoroplastic, 6.3 parts antistatic agent, and 0.5 parts slip agent;

[0057] The core layer comprises the following components in the following mass ratio: 70 parts high-density polyethylene, 15 parts matting agent, 3 parts dispersant, and 1.0 part antioxidant;

[0058] The matting agent is a mixture of precipitated silica matting powder and organic matting agent. The mixing ratio of precipitated silica matting powder and organic matting agent is 1:1. The particle size of the organic matting agent is d50 in the range of 8.5μm and d90 in the range of 19.0μm. The pore volume of the silica matting powder is 1.8mL / g and the particle size is 2.5μm.

[0059] The lower layer comprises the following components in the following mass ratio: 97 parts polypropylene and 3.0 parts polymethacrylate.

[0060] (2) The raw materials of the upper surface layer, core layer and lower surface layer are melted at 200°C and then extruded simultaneously from one die through three channels to form a thick sheet;

[0061] (3) The thick sheet is subjected to longitudinal stretching and transverse stretching in sequence. The longitudinal stretching process is as follows: the preheating temperature is 120℃, the stretching temperature is 100℃, the stretching ratio is 5.0, and the setting temperature is 130℃. The transverse stretching process is as follows: the preheating temperature is 140℃, the stretching temperature is 135℃, the stretching ratio is 9, and the setting temperature is 145℃ to form a film.

[0062] (4) After cooling the film at a temperature of 45°C, a plate transfer film is obtained.

[0063] The transfer film was laminated onto a commercially available PETG board with a thickness of 2 cm and a lamination temperature of 185°C to prepare the PETG board.

[0064] Comparative Example 1

[0065] The difference between this comparative example and Example 1 is that the core layer does not contain matting material; otherwise, it is the same as Example 1.

[0066] Comparative Example 2

[0067] The difference between this comparative example and Example 1 is that the matting material in the core layer only includes precipitated silica matting powder; otherwise, it is the same as Example 1.

[0068] Comparative Example 3

[0069] The difference between this comparative example and Example 1 is that the matting agent in the core layer only includes Pergopak organic matting agent; otherwise, it is the same as Example 1.

[0070] Performance testing

[0071] Gloss Measurement: Gloss is an optical property indicating the degree to which a sheet surface reflects light in a specular direction. Generally, the greater the amount of reflected light, the higher the gloss of the sheet surface. For gloss measurement, a gloss meter is used to determine the intensity of reflected light at different incident angles. Based on the gloss level, the surface finish of the sheet can be classified into three types: high gloss, matte, and matte, as shown in Table 1. The gloss of the PETG sheets prepared in Examples 1-3 and Comparative Examples 1-3 was measured using a gloss meter at an incident angle of 60°. The test results are shown in Table 2.

[0072] Table 1 Surface Effects of Sheets

[0073] Surface finish of the board Highlights Matte No light Glossiness / % ＞60 15-60 ＜15

[0074] Table 2 Material gloss (60°)

[0075]

[0076]

[0077] As shown in Table 2, the commercially available PETG sheet has a gloss value of 82%, indicating a high gloss level. The PETG sheets prepared in Examples 1-3 show a significantly lower gloss level, but the PETG sheet prepared in Comparative Example 1 still exhibits a high gloss level. This is because the transfer film of this invention prepares the core layer by adding a matting agent to high-density polyethylene. The addition of the matting agent to high-density polyethylene forms a heterogeneous film, resulting in inconsistent refractive indices in different micro-regions of the core layer. This reduces the intensity of reflected light from the core layer, thereby achieving a matting effect on the PETG sheet. Furthermore, during the cooling process at 40-45°C during the preparation of the transfer film, the tiny particles of the matting agent create micro-roughness in the core layer. By setting the matting agent to be silica-based matting powder with a particle size of 1.5-2.5 μm and an organic matting agent with a particle size d50 range of 3.5-8.5 μm, the gradient distribution of particle size further improves the micro-roughness of the core layer, reducing light reflection and increasing scattered light, thus enabling the transfer film to achieve a matting effect, thereby achieving a matting effect on the PETG sheet.

[0078] However, as shown in Table 2, the matting effect of PETG sheets prepared by Comparative Examples 2 and 3 using only precipitated silica matting powder or Pergopak organic matting agent was not ideal. Therefore, precipitated silica matting powder and Pergopak organic matting agent have a synergistic effect in the matting material. Under the synergistic effect of the two, the gloss value of the prepared PETG sheets reached 35-42%.

[0079] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0080] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plate transfer film, characterized in that, From top to bottom, it includes the upper surface layer, the core layer, and the lower surface layer; The upper surface layer comprises the following components in the following mass ratio: 89-91 parts polypropylene, 1.1-6.3 parts antistatic agent, and 0.2-0.5 parts slip agent; The core layer comprises the following components in the following mass ratio: 40-70 parts high-density polyethylene, 2-15 parts matting agent, 1-3 parts dispersant, and 0.1-1.0 parts antioxidant; The lower surface layer comprises the following components in the following mass ratio: 95-97 parts polypropylene and 3.0-5.0 parts polymethacrylate; The matting material is a silica-based matting powder with a particle size of 1.5-2.5 μm and an organic matting agent with a particle size d50 range of 3.5-8.5 μm; The process of preparing the transfer film on the substrate includes cooling at 40-45°C.

2. The plate transfer film as described in claim 1, characterized in that, The silica-based matting powder includes precipitated silica matting powder.

3. The plate transfer film as described in claim 1, characterized in that, The silica-based matting agent has a pore volume of 1.2-1.8 mL / g.

4. The plate transfer film as described in claim 1, characterized in that, The particle size d90 of the organic matting agent ranges from 9.0 to 19.0 μm.

5. The plate transfer film as described in claim 1, characterized in that, The upper surface layer also includes fluoroplastic 46, and the upper surface layer comprises the following components in the following mass ratio: 49-51 parts polypropylene, 40-48 parts fluoroplastic 46, 1.1-6.3 parts antistatic agent, and 0.2-0.5 parts slip agent.

6. A method for preparing a plate transfer film as described in any one of claims 1-5, characterized in that, Includes the following steps: (1) Prepare the raw materials for the upper surface layer, core layer, and lower surface layer respectively; (2) The raw materials of the upper surface layer, core layer and lower surface layer are melted and extruded simultaneously from one die through three channels to form a thick sheet; (3) The thick sheet is subjected to longitudinal stretching and transverse stretching in sequence to form a thin film; (4) After cooling the film at a temperature of 40-45℃, a plate transfer film is obtained.

7. The preparation method according to claim 6, characterized in that, The longitudinal stretching process is as follows: preheating temperature is 110-120℃, stretching temperature is 90-100℃, stretching ratio is 4.8-5.0, and setting temperature is 120-130℃.

8. The preparation method according to claim 6, characterized in that, The transverse stretching process is as follows: preheating temperature is 130-140℃, stretching temperature is 125-135℃, stretching ratio is 7-9, and setting temperature is 135-145℃.

9. The application of the sheet transfer film according to any one of claims 1-5 in the preparation of PETG sheets, characterized in that, The transfer film is laminated onto a PETG board at 175℃-185℃ to obtain a PETG board with a gloss value of 35-42%.

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