PET (Polyethylene Terephthalate) embossed film for color change of car cover and preparation method of PET embossed film
By mixing modifiers with PET to form a three-layer PET embossed film, the problem of easy shape destruction of PET mesh film at high temperatures is solved. This achieves the preservation of mesh pattern and improved antistatic ability at high temperatures, simplifies the process and reduces costs.
Patent Information
- Application Number
- CN202411449595.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-01-07
AI Technical Summary
The existing PET mesh film is prone to damage to its mesh shape during high-temperature release film processing, and the PE coating process is complex and costly, with low silicon transfer rate and difficulty in complete curing.
Low-melting-point polyester and PETG are used as modifiers, mixed with glossy chips and opening agents, and then dried, melted, screw extruded, cast, cast, stretched and embossed to form a three-layer PET embossed film. An antistatic agent is added to improve the antistatic ability, and an organosilicon release agent is coated on the base film. Multi-zone drying technology is used.
The prepared PET embossed film is heat resistant, the grid pattern is not damaged, and the original shape and pattern are maintained. The antistatic ability is improved, and the process is simple and low cost.
Smart Images
Figure CN119261261A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a PET embossed film for changing the color of a car cover and a preparation method thereof, belonging to the technical field of PET embossed films. Background Art
[0002] With the continuous development of automobile culture, more and more car owners will try to change the color of their car bodies. The car body color-changing film is a protective film covering the car body. It can not only change the color of the car body, but also protect the car paint to prevent the original car paint from being damaged by scratches or flying stones.
[0003] The bottom layer of the existing color-changing film is composed of a grid release film. The grid shape of this grid release film can be transferred to the adhesive layer, so that the car cover color-changing film has excellent exhaust function when it is dry-applied to the car body, which greatly optimizes the film-applying process and is far more efficient than the current wet-applying process.
[0004] The base material of the mesh release film is PET mesh film. At present, the production process of PET mesh film mainly includes PE coating PET and then calendering or PET direct calendering. However, since PE is not heat-resistant after PE coating, the temperature of the oven in the later release film production cannot be too high, which makes it difficult for the silicone release agent to cure completely, and the silicon transfer rate will increase. In addition, the process is complicated and the cost is high. When the PET mesh film directly calendered is subjected to high temperature during the release film processing, the mesh shape is destroyed and the original shape cannot be maintained. Summary of the invention
[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a PET embossed film for changing the color of car covers and a preparation method thereof, which is resistant to high temperature recovery and convenient for the subsequent curing of the release film without damaging the grid pattern, and can maintain the original shape and pattern.
[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions: In one aspect, the present invention provides a method for preparing a PET embossed film for changing the color of a car cover, comprising: The glossy slice, the opening agent and the modifier are uniformly mixed to obtain a surface layer formula, wherein the modifier is one of a low-melting point polyester and PETG, and the low-melting point polyester is a polyester with a melting point lower than 265° C.; Use pure polyester as the main layer formula; The surface layer formula and the main layer formula are sequentially dried, melted, screw extruded, distributed through a die head, and then cast and cast to obtain a sheet; stretching the sheet to obtain a base film; The base film is embossed to obtain a base film having a grid pattern on the surface; A release agent is coated on a base film having a grid pattern on the surface, and the base film is dried to obtain a PET embossed film for changing the color of a car cover.
[0007] Furthermore, the opening agent is one or more of silicon dioxide, kaolin, talc, and diatomaceous earth.
[0008] Furthermore, the surface layer formula is also added with an antistatic agent, and the mass ratio of the glossy slice, the opening agent, the antistatic agent and the modifier is 70.8~80.8:0.8:0.4:18~28.
[0009] Furthermore, the antistatic agent is a surfactant.
[0010] Furthermore, the drying temperature is 140°C to 150°C, the screw extrusion temperature is 260°C to 280°C, the casting temperature is 270°C to 290°C, and the casting temperature is 22°C to 28°C.
[0011] Furthermore, the stretching parameters include a longitudinal stretching temperature of 70°C to 85°C, a longitudinal stretching ratio of 1 to 4, a transverse stretching temperature of 110°C to 120°C, a transverse stretching ratio of 1 to 4, and a setting temperature of 190°C to 250°C.
[0012] Furthermore, the embossing treatment is performed on the base film to obtain a base film having a grid pattern on the surface, comprising: heating the base film to soften it; The base film is embossed by a carved roller, and after shaping and cooling, a base film with a grid pattern on the surface is obtained, wherein the depth of the grid pattern is 1-100 μm.
[0013] Furthermore, the release agent is a silicone release agent, and its coating process parameters include unwinding tension of 120N~240N, unwinding traction tension of 170N~270N, cooling tension of 170N~270N, material collection and storage traction tension of 170N~270N, taper of 15%~35%, coating speed of 15m / min~30m / min, speed ratio of 1~1.4, and release agent coating amount of 0.1g / m 2 ~2g / m 2 ; The drying is achieved by drying in multiple zones of an oven in sequence, and the drying temperature ranges of the multiple zones of the oven are 45°C~55°C, 65°C~75°C, 90°C~100°C, 115°C~125°C, 115°C~125°C, 90°C~100°C, 65°C~75°C, and 45°C~55°C in sequence.
[0014] On the other hand, the present invention also provides a PET embossed film for changing the color of car covers prepared by the preparation method of the PET embossed film for changing the color of car covers as described in any of the above items, comprising a three-layer structure, the middle of which is a main layer, the upper and lower sides of the main layer are both surface layers, and the surface of the surface layer on the upper side is provided with a release film.
[0015] Compared with the prior art, the present invention has the following beneficial effects: The preparation method provided by the present invention has simple process and low cost. The prepared PET embossed film for changing the color of car covers is resistant to high temperature recovery, which is convenient for the subsequent release film curing without damaging the grid pattern and can maintain the original shape and pattern, thus solving the problem of complex process and poor adhesion of PE coating PET. An antistatic agent is added to the components of the present invention. The antistatic agent is a surfactant, which can help to exert a conductive effect, thereby reducing the surface static electricity of the PET embossed film for changing the color of the car cover and improving the antistatic ability of the PET embossed film for changing the color of the car cover. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the structure of a PET embossed film for changing the color of a car cover in one embodiment of the present invention; In the figure: 1 base film, 101 main layer, 102 surface layer, 2 grid pattern, 3 release film. DETAILED DESCRIPTION
[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention. Example 1
[0018] The embodiment of the present invention provides a method for preparing a PET embossed film for changing the color of a car cover, comprising the following steps: The surface layer formula is obtained by mixing the glossy chips, the opening agent, the antistatic agent and the modifier evenly, wherein the opening agent is kaolin, the modifier is polyester with a melting point lower than 265°C, and the mass ratio of the glossy chips, kaolin, the antistatic agent and the low melting point polyester is 70.8:0.8:0.4:28. The main layer formula is pure polyester.
[0019] The surface layer formula and the main layer formula were dried, melted, extruded by a screw at 260°C, distributed through a die, and then cast at 270°C and cast at 25°C to obtain a sheet.
[0020] The sheet was stretched, and the stretching condition parameters were as follows: longitudinal stretching temperature of 70°C, longitudinal stretching ratio of 3.5 times, transverse stretching temperature of 110°C, transverse stretching ratio of 4 times, and setting temperature of 230°C, to obtain a base film after stretching.
[0021] The base film is embossed by an embossing device equipped with a carved roller. The embossing treatment specifically includes: heating the base film to 120°C to soften it, and then embossing it by pressing it with a patterned roller and a pressure backing roller. The embossed pattern is a square grid with a grid side length of 0.3mm, an interval between adjacent grids of 0.06mm, and a depth of 20 microns, thereby obtaining a base film with a grid pattern on the surface.
[0022] In some other embodiments, the shape of the grid pattern is not limited and depends on the actual situation. Generally, it is a rhombus, a regular hexagon, a square, etc.
[0023] The silicone release agent is coated on the base film with a grid pattern on the surface. The coating process parameters include unwinding tension 180N, unwinding traction tension 220N, cooling tension 220N, material storage traction tension 220N, taper 25%, coating speed 20m / min, speed ratio 1.2, and release agent coating amount of 0.15g / m 2 After coating, it is dried. The drying is achieved by passing through each zone of the oven in sequence. The temperature of each zone of the oven is 50℃, 70℃, 90℃, 115℃, 115℃, 90℃, 70℃, and 50℃. Finally, the prepared PET embossed film for car cover color change is obtained. Figure 1 shown. Example 2
[0024] The embodiment of the present invention provides a method for preparing a PET embossed film for changing the color of a car cover, comprising the following steps: The surface layer formula is obtained by uniformly mixing the glossy slice, the opening agent and the modifier, wherein the opening agent is silicon dioxide, the modifier is PETG, and the mass ratio of the glossy slice, kaolin and PETG is 81.2:0.8:18. The main layer formula is pure polyester.
[0025] The surface layer formula and the main layer formula were dried, melted, extruded through a screw at 260°C, distributed through a die, and then cast at 270°C and cast at 25°C to obtain a sheet.
[0026] The sheet was stretched, and the stretching condition parameters were as follows: longitudinal stretching temperature of 70°C, longitudinal stretching ratio of 3.6 times, transverse stretching temperature of 110°C, transverse stretching ratio of 3.8 times, and setting temperature of 230°C, to obtain a base film after stretching.
[0027] The base film is embossed by an embossing device equipped with a carved roller. The embossing treatment specifically includes: heating the base film to 120°C to soften it, and then embossing it by pressing it with a patterned roller and a pressure backing roller. The embossed pattern is a square grid with a grid side length of 0.1 mm, an interval between adjacent grids of 0.02 mm, and a depth of 10 microns, to obtain a base film with a grid pattern on the surface.
[0028] The silicone release agent is coated on the base film with a grid pattern on the surface. The coating process parameters include unwinding tension of 180N, unwinding traction tension of 220N, cooling tension of 220N, material collection and storage traction tension of 220N, taper of 25%, coating speed of 15m / min, speed ratio of 1.1, and release agent coating amount of 0.2g / m 2 After coating, drying is carried out, and the drying is achieved in each area of the oven in turn. The temperatures of each area of the oven are 50°C, 70°C, 95°C, 120°C, 120°C, 95°C, 70°C, and 50°C, and finally the prepared PET embossed film for car cover color change is obtained.
[0029] Comparative Example 1: This comparative example provides a method for preparing a PET embossed film for changing the color of car covers, which differs from Example 1 only in that no modifier is added, and the surface layer formula is obtained after the glossy slices, the opening agent and the antistatic agent are evenly mixed, wherein the mass ratio of the glossy slices, the opening agent and the antistatic agent is 98.8:0.8:0.4.
[0030] Comparative Example 2: This comparative example provides a method for preparing a PET embossed film for changing the color of car covers, which differs from Example 1 only in that the mass ratio of the glossy slice, kaolin, antistatic agent, and low-melting-point polyester is 90.8:0.8:0.4:8.
[0031] Comparative Example 3: This comparative example provides a method for preparing a PET embossed film for changing the color of car covers, which differs from Example 1 only in that the mass ratio of the glossy slice, kaolin, antistatic agent, and low-melting-point polyester is 50.8:0.8:0.4:48.
[0032] The following tests were conducted on the PET embossed films for changing the color of car covers prepared in Examples 1 to 2 and Comparative Examples 1 to 3.
[0033] Test method: Put the PET embossed film for car cover color changing prepared in Examples 1-2 and Comparative Examples 1-3 into an oven at 150°C for 10 minutes, and then observe the grid pattern state and the embossed film state.
[0034] The observation results are shown in Table 1: Table 1: Test results of the PET embossed films for car cover color change prepared in Examples 1-2 and Comparative Examples 1-3
[0035] Combined with Table 1, it can be seen that the grids of the PET embossed films for car cover color change prepared by Examples 1 and 2 are still retained and not restored because the added modifiers are appropriate. No modifier was added in Comparative Example 1, too little modifier was added in Comparative Example 2, and too much modifier was added in Comparative Example 3. Comparison of Comparative Example 1 with Comparative Example 2 and Comparative Example 3 shows that as the amount of modifier added gradually increases, the grid pattern changes from complete restoration to partial restoration. However, as the amount of modifier added increases to a certain extent, the embossed film will experience heat shrinkage. This is because the proportion of modifier is too high and the melting point of the modifier itself is low, which makes the temperature resistance of the prepared embossed film worse.
[0036] Furthermore, the antistatic ability of the PET embossed film for changing the color of the car cover prepared in Example 1 and Example 2 was tested. The antistatic ability test used a professional impedance measuring instrument. The test method is a prior art and will not be described in detail here. The test results show that the antistatic ability of the PET embossed film for changing the color of the car cover prepared in Example 1 is better than that of Example 2.
[0037] In summary, the PET embossed film for changing the color of car covers prepared by adding modifiers and combining reasonable material ratios is resistant to high temperature recovery, convenient for subsequent release film and curing, and will not damage the grid pattern, and can maintain the original shape and pattern.
[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A method for preparing a PET embossed film for changing the color of a car cover, characterized in that: include: The glossy slice, the opening agent and the modifier are uniformly mixed to obtain a surface layer formula, wherein the modifier is one of a low melting point polyester and PETG, and the low melting point polyester is a polyester with a melting point lower than 265° C.; Use pure polyester as the main layer formula; The surface layer formula and the main layer formula are sequentially dried, melted, screw extruded, distributed through a die head, and then cast and cast to obtain a sheet; stretching the sheet to obtain a base film; The base film is embossed to obtain a base film having a grid pattern on the surface; A release agent is coated on a base film having a grid pattern on the surface, and the base film is dried to obtain a PET embossed film for changing the color of a car cover.
2. The method for preparing the PET embossed film for changing the color of car cover according to claim 1, characterized in that: The opening agent is one or more of silicon dioxide, kaolin, talc and diatomaceous earth.
3. The method for preparing the PET embossed film for changing the color of car cover according to claim 1, characterized in that: The surface layer formula is further added with an antistatic agent, and the mass ratio of the glossy slice, the opening agent, the antistatic agent and the modifier is 70.8-80.8:0.8:0.4:18-28.
4. The method for preparing the PET embossed film for changing the color of car cover according to claim 3, characterized in that: The antistatic agent is a surfactant.
5. The method for preparing the PET embossed film for changing the color of car cover according to claim 1, characterized in that: The drying temperature is 140℃~150℃, the screw extrusion temperature is 260℃~280℃, the casting temperature is 270℃~290℃, and the casting temperature is 22℃~28℃.
6. The method for preparing the PET embossed film for changing the color of car cover according to claim 1, characterized in that: The stretching parameters include a longitudinal stretching temperature of 70°C to 85°C, a longitudinal stretching ratio of 1 to 4, a transverse stretching temperature of 110°C to 120°C, a transverse stretching ratio of 1 to 4, and a setting temperature of 190°C to 250°C.
7. The method for preparing the PET embossed film for changing the color of car cover according to claim 1, characterized in that: The method of embossing the base film to obtain a base film having a grid pattern on the surface includes: heating the base film to soften it; The base film is embossed by a carved roller, and after shaping and cooling, a base film with a grid pattern on the surface is obtained, wherein the depth of the grid pattern is 1-100 μm.
8. The method for preparing the PET embossed film for changing the color of car cover according to claim 1, characterized in that: The release agent is a silicone release agent, and its coating process parameters include unwinding tension of 120N~240N, unwinding traction tension of 170N~270N, cooling tension of 170N~270N, material collection and storage traction tension of 170N~270N, taper of 15%~35%, coating speed of 15m / min~30m / min, speed ratio of 1~1.4, and release agent coating amount of 0.1g / m 2 ~2g / m 2 ; The drying is achieved by drying in multiple zones of an oven in sequence, and the drying temperature ranges of the multiple zones of the oven are 45°C~55°C, 65°C~75°C, 90°C~100°C, 115°C~125°C, 115°C~125°C, 90°C~100°C, 65°C~75°C, and 45°C~55°C in sequence.
9. A PET embossed film for changing the color of a car cover prepared by the method for preparing a PET embossed film for changing the color of a car cover according to any one of claims 1 to 8, characterized in that: The invention comprises a three-layer structure, wherein the middle layer is a main layer, the upper and lower sides of the main layer are both surface layers, and a release film is arranged on the surface of the surface layer located on the upper side.