Corrosion-resistant PET film and preparation method thereof

Abstract

The invention provides a corrosion-resistant PET film and a preparation method thereof, and belongs to the technical field of new materials. The problem of poor stability in the prior art is solved. The corrosion-resistant PET film comprises the following raw material components in percentage by mass: 30%-50% of modified PET plastic, 11%-15% of a toughening agent, 8%-12% of ethylene glycol, 15%-19% of polyurethane, 9%-13% of ethyl acetoacetate and 7%-11% of polyamide. The preparation method of the corrosion-resistant PET film comprises the following steps: A, melting and extruding; b, cooling and shaping: a roll shaft forming machine is provided with a forming part I and a forming part II, the semi-finished sheet is subjected to cooling forming treatment after passing through the forming part I, and the semi-finished sheet subjected to cooling forming treatment is subjected to stretching and heat shaping treatment on the forming part II. The corrosion-resistant PET film is high in stability, and the preparation method is high in operation efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of new materials and relates to a corrosion-resistant PET film and a preparation method thereof. Background Art

[0002] PET film (Polyethylene Terephthalate film) is a film material made of polyethylene terephthalate (PET) with many unique performance advantages, which makes it widely used in multiple industries.

[0003] PET film has good mechanical properties, chemical stability and optical transparency, and is suitable for a variety of application scenarios.

[0004] The production process of PET film (polyethylene terephthalate film) usually includes the following main steps: raw material preparation, melt extrusion, biaxial stretching, surface treatment and finished product testing. These steps ensure that the PET film has excellent mechanical properties, chemical stability and optical transparency.

[0005] In the existing PET film preparation process, film stretching requires two independent processes, namely, cooling and initial forming after extrusion and stretching under set temperature conditions. The two independent processes make the preparation method cumbersome and the preparation efficiency low. Summary of the invention

[0006] The first object of the present invention is to provide a corrosion-resistant PET film with high stability in view of the above-mentioned problems in the prior art.

[0007] The second object of the present invention is to provide a method for preparing the corrosion-resistant PET film.

[0008] The first object of the present invention can be achieved by the following technical solutions:

[0009] A corrosion-resistant PET film, characterized in that the raw material components thereof are as follows by mass percentage: 30%-50% modified PET plastic, 11%-15% toughening agent, 8%-12% ethylene glycol, 15%-19% polyurethane, 9%-13% ethyl acetoacetate, and 7%-11% polyamide.

[0010] The second object of the present invention can be achieved by the following technical solutions:

[0011] A method for preparing a corrosion-resistant PET film, characterized in that the method comprises the following steps:

[0012] A. Melting and extrusion: The dried PET raw material is fed into the extruder. During the operation of the extruder, the internal high temperature melts the raw material into liquid raw material. The liquid raw material is output from the discharge end of the extruder to obtain a sheet semi-finished product;

[0013] B. Cooling and shaping: The roller forming machine has a shaping section 1 and a shaping section 2. The semi-finished sheet is cooled and shaped after passing through the shaping section 1. After the cooling and shaping, the semi-finished sheet is stretched and heat-shaped in the shaping section 2.

[0014] In the above-mentioned method for preparing the corrosion-resistant PET film, the roller forming machine includes a frame, and storage rollers and receiving rollers are axially fixed at both ends of the frame, and is characterized in that vertical guard plates are respectively provided on both sides of the middle part of the frame, and the storage rollers, forming part one, forming part two and receiving rollers are arranged from front to back along the conveying direction of the semi-finished raw materials, and the forming part one and forming part two are connected between the two guard plates.

[0015] In the above-mentioned method for preparing the corrosion-resistant PET film, the forming part one includes a conveying roller one, a conveying roller two and a plurality of transition rollers, the conveying roller one is axially fixed on the frame and is adjacent to the storage roller, the conveying roller two is axially fixed between two guard plates and is adjacent to the forming part two, and a plurality of transition rollers are evenly distributed between the conveying roller one and the conveying roller two.

[0016] In the above-mentioned method for preparing the corrosion-resistant PET film, a plurality of transition rollers are arranged in an arc-shaped track with the arc-shaped notches of the arc-shaped track facing downward.

[0017] In the above-mentioned method for preparing the corrosion-resistant PET film, the guard plate has a penetrating mounting hole, a fan can be installed at the mounting hole, and a plurality of transition rollers form a cooling section for unfolding the semi-finished sheet, and the fan installed at the mounting hole is located directly below the cooling section.

[0018] In the above-mentioned method for preparing the corrosion-resistant PET film, the second forming part includes a heating roller, a stretching roller and a discharge roller. The discharge roller is axially fixedly connected between two guard plates and is adjacent to the storage roller. The stretching roller is located between the discharge roller and the second conveying roller. The heating roller is connected between the two guard plates and is adjacent to the stretching roller. A stretching assembly is provided between the stretching roller and the frame, and the stretching roller can be moved closer to or away from the heating roller under the action of the stretching assembly.

[0019] In the above-mentioned method for preparing corrosion-resistant PET film, the stretching assembly includes a cylinder, connecting rod one, connecting rod two and a slider. The above-mentioned guard plate has a penetrating guide hole, the above-mentioned slider is embedded in the guide hole, the cylinder body of the above-mentioned cylinder is hinged on the frame, the lower end of the above-mentioned connecting rod is hinged on the piston rod of the cylinder, the upper end of the above-mentioned connecting rod two is hinged on the slider, the lower end of the connecting rod two is hinged to the upper end of the connecting rod one, and the above-mentioned stretching roller is axially fixed to the slider.

[0020] In the above-mentioned method for preparing the corrosion-resistant PET film, the second conveying roller is flush with the discharge roller, and the above-mentioned stretching roller is located at the upper part between the second conveying roller and the discharge roller.

[0021] In the above-mentioned method for preparing the corrosion-resistant PET film, the heating roller and the stretching roller are adjacent to each other and are flush with each other.

[0022] Compared with the prior art, the corrosion-resistant PET film creatively adds polyurethane and polyamide, so the finished PET film not only has good corrosion resistance but also has stable quality.

[0023] At the same time, in the preparation method of the corrosion-resistant PET film, since cooling and shaping are both processed in a roller forming machine, the preparation process is simplified, the operation efficiency is effectively improved, and the film has a high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of a roller forming machine.

[0025] Figure 2 It is a schematic diagram of the cross-sectional structure of a roller forming machine.

[0026] In the figure, 1, frame; 2, storage roller; 3, storage roller; 4, guard plate; 4a, mounting hole; 4b, guide hole; 5, conveying roller one; 6, conveying roller two; 7, transition roller; 8, heating roller; 9, stretching roller; 10, discharge roller; 11, cylinder; 12, connecting rod one; 13, connecting rod two; 14, slider. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly mounted on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0030] Embodiment 1

[0031] The raw material components of the corrosion-resistant PET film are as follows: 30% of modified PET plastic, 11% of toughening agent, 8% of ethylene glycol, 15% of polyurethane, 9% of ethyl acetoacetate and 7% of polyamide in percentage by weight.

[0032] A method for preparing a corrosion-resistant PET film, characterized in that the method comprises the following steps:

[0033] A. Melting and extrusion: The dried PET raw material is fed into the extruder. During the operation of the extruder, the internal high temperature melts the raw material into liquid raw material. The liquid raw material is output from the discharge end of the extruder to obtain a sheet semi-finished product;

[0034] B. Cooling and shaping: The roller forming machine has a shaping section 1 and a shaping section 2. The semi-finished sheet is cooled and shaped after passing through the shaping section 1. After the cooling and shaping, the semi-finished sheet is stretched and heat-shaped in the shaping section 2.

[0035] like Figure 1 and Figure 2 As shown, the roller forming machine includes a frame 1, and a storage roller 2 and a collection roller 3 are axially fixed at both ends of the frame 1, and vertical guard plates 4 are respectively provided on both sides of the middle part of the frame 1. The storage roller 2, forming part 1, forming part 2 and collection roller 3 are arranged from front to back along the conveying direction of the semi-finished raw materials, and the forming part 1 and the forming part 2 are connected between the two guard plates 4.

[0036] The roller forming machine creatively has storage rollers 2 for storing semi-finished sheets and take-up rollers 3 for winding up finished films at both ends thereof.

[0037] Of course, both the storage roller 2 and the storage roller 3 have a driving member for driving them to rotate continuously. Since the driving member is an existing motor, how the motor is connected to the storage roller 2 and the storage roller 3 is not a technical problem that needs to be solved by this patent, so it will not be repeated in the embodiment.

[0038] Although the forming part 1 and the forming part 2 arranged front and back between the two guard plates 4 are independent of each other, the forming part 1 and the forming part 2 are centrally arranged. Therefore, the semi-finished sheet can be quickly cooled and shaped, which effectively improves the working efficiency and avoids cumbersome processes.

[0039] The forming part 1 includes a conveying roller 1 5, a conveying roller 2 6 and a plurality of transition rollers 7. The conveying roller 1 5 is axially fixedly connected to the frame 1 and is adjacent to the storage roller 2. The conveying roller 2 6 is axially fixedly connected between two guard plates 4 and is adjacent to the forming part 2. The plurality of transition rollers 7 are evenly distributed between the conveying roller 1 5 and the conveying roller 2 6.

[0040] A plurality of transition rollers 7 are arranged in an arc-shaped track with the arc-shaped notches of the arc-shaped track facing downward.

[0041] The semi-finished sheet material closely attached to the transition rollers 7 also forms an arc structure, and the airflow output by the fan quickly acts on the inner side of the arc of the semi-finished sheet material, ensuring that the semi-finished sheet material can be quickly cooled and formed.

[0042] The guard plate 4 has a through mounting hole 4a, and a fan can be installed at the mounting hole 4a. A plurality of transition rollers 7 form a cooling section for unfolding the semi-finished sheet, and the fan installed at the mounting hole 4a is located directly below the cooling section.

[0043] The fan can be stably installed at the lower part of the cooling part through the installation hole 4a, ensuring that the cooling part can be stably cooled by air.

[0044] The second forming part includes a heating roller 8, a stretching roller 9 and a discharge roller 10. The discharge roller 10 is axially fixed between the two guard plates 4 and is adjacent to the storage roller 3. The stretching roller 9 is located between the discharge roller 10 and the second conveying roller 6. The heating roller 8 is connected between the two guard plates 4 and is adjacent to the stretching roller 9. A stretching assembly is provided between the stretching roller 9 and the frame 1, and the stretching roller 9 can be moved closer to or away from the heating roller 8 under the action of the stretching assembly.

[0045] The stretching assembly can drive the stretching roller 9 to translate relative to the heating roller 8. Such a structure can not only heat the semi-finished sheet stably, but also stretch it immediately after heating.

[0046] The stretching assembly includes a cylinder 11, a connecting rod 12, a connecting rod 13 and a slider 14. The guard plate 4 has a penetrating guide hole 4b, and the slider 14 is embedded in the guide hole 4b. The cylinder body of the cylinder 11 is hinged on the frame 1, the lower end of the connecting rod 12 is hinged on the piston rod of the cylinder 11, the upper end of the connecting rod 12 is hinged on the slider 14, the lower end of the connecting rod 13 is hinged to the upper end of the connecting rod 12, and the stretching roller 9 is axially fixed to the slider 14.

[0047] During the extension and retraction of the piston rod of the cylinder 11, the slider 14 can be stably translated under the action of the connecting rod 12 and the connecting rod 2 13. Since the stretching roller 9 is connected to the slider 14, the stretching roller 9 is finally translated relative to the heating roller 8.

[0048] The second conveying roller 6 is flush with the discharge roller 10 , and the stretching roller 9 is located at the upper part between the second conveying roller 6 and the discharge roller 10 .

[0049] Such a structure enables the semi-finished sheet wound around the conveying roller 2 6 and the discharge roller 10 to be stably tensioned.

[0050] The heating roller 8 and the stretching roller 9 are adjacent to each other and are flush with each other.

[0051] Since polyurethane and polyamide are creatively added to the corrosion-resistant PET film, the finished PET film not only has good corrosion resistance but also has stable quality.

[0052] At the same time, in the preparation method of the corrosion-resistant PET film, since cooling and shaping are both processed in a roller forming machine, the preparation process is simplified, the operation efficiency is effectively improved, and the film has a high practical value.

[0053] Embodiment 2

[0054] This embodiment is basically the same as the first embodiment, except that:

[0055] The raw material components of the corrosion-resistant PET film are as follows: 50% of modified PET plastic, 15% of toughening agent, 12% of ethylene glycol, 19% of polyurethane, 13% of ethyl acetoacetate, and 11% of polyamide in percentage by weight.

[0056] Embodiment 3

[0057] This embodiment is basically the same as the first embodiment, except that:

[0058] The raw material components of the corrosion-resistant PET film are as follows: 30%-50% of modified PET plastic, 13% of toughening agent, 10% of ethylene glycol, 17% of polyurethane, 10% of ethyl acetoacetate and 8% of polyamide.

[0059] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection claimed by the present invention.

Claims

1. A corrosion-resistant PET film, characterized in that: The mass percentages of the raw material components are: 30%-50% of modified PET plastic, 11%-15% of toughening agent, 8%-12% of ethylene glycol, 15%-19% of polyurethane, 9%-13% of ethyl acetoacetate, and 7%-11% of polyamide.

2. A method for preparing a corrosion-resistant PET film, characterized in that: The method comprises the following steps: A. Melting and extrusion: The dried PET raw material is fed into the extruder. During the operation of the extruder, the internal high temperature melts the raw material into liquid raw material. The liquid raw material is output from the discharge end of the extruder to obtain a sheet semi-finished product; B. Cooling and shaping: The roller forming machine has a shaping section 1 and a shaping section 2. The semi-finished sheet is cooled and shaped after passing through the shaping section 1. After the cooling and shaping, the semi-finished sheet is stretched and heat-shaped in the shaping section 2.

3. The method for preparing the corrosion-resistant PET film according to claim 2, characterized in that: The roller forming machine includes a frame, and storage rollers and receiving rollers are axially fixed at both ends of the frame. It is characterized in that vertical guard plates are respectively provided on both sides of the middle part of the frame, and the storage rollers, forming part one, forming part two and receiving rollers are arranged from front to back along the conveying direction of the semi-finished raw materials, and the forming part one and the forming part two are connected between the two guard plates.

4. The method for preparing the corrosion-resistant PET film according to claim 3, characterized in that: The forming part 1 includes a conveying roller 1, a conveying roller 2 and a plurality of transition rollers. The conveying roller 1 is axially fixed on the frame and is adjacent to the storage roller. The conveying roller 2 is axially fixed between two guard plates and is adjacent to the forming part 2. The plurality of transition rollers are evenly distributed between the conveying roller 1 and the conveying roller 2.

5. The method for preparing the corrosion-resistant PET film according to claim 4, characterized in that: A plurality of transition rollers are arranged in an arc track, with the arc notches of the arc track facing downwards.

6. The method for preparing the corrosion-resistant PET film according to claim 5, characterized in that: The guard plate is provided with a through mounting hole, a fan can be installed at the mounting hole, a plurality of transition rollers form a cooling section for unfolding the semi-finished sheet, and the fan installed at the mounting hole is located directly below the cooling section.

7. The method for preparing the corrosion-resistant PET film according to claim 6, characterized in that: The second forming part includes a heating roller, a stretching roller and a discharging roller. The discharging roller is axially fixedly connected between two guard plates and is adjacent to the storage roller. The stretching roller is located between the discharging roller and the second conveying roller. The heating roller is connected between the two guard plates and is adjacent to the stretching roller. A stretching assembly is provided between the stretching roller and the frame, and the stretching roller can be moved closer to or away from the heating roller under the action of the stretching assembly.

8. The method for preparing the corrosion-resistant PET film according to claim 7, characterized in that: The stretching assembly includes a cylinder, a connecting rod 1, a connecting rod 2 and a slider. The guard plate is provided with a penetrating guide hole, the slider is embedded in the guide hole, the cylinder body of the cylinder is hinged on the frame, the lower end of the connecting rod is hinged on the piston rod of the cylinder, the upper end of the connecting rod 2 is hinged on the slider, the lower end of the connecting rod 2 is hinged to the upper end of the connecting rod 1, and the stretching roller is axially fixed to the slider.

9. The method for preparing the corrosion-resistant PET film according to claim 8, characterized in that: The second conveying roller is flush with the discharging roller, and the stretching roller is located at the upper part between the second conveying roller and the discharging roller.

10. The method for preparing the corrosion-resistant PET film according to claim 9, characterized in that: The heating roller is adjacent to the stretching roller and the two are flush with each other.

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