PET composite film and preparation method thereof

Abstract

The PET composite film comprises a composite film body, the composite film body comprises a PET base material layer, and the PET composite film is characterized in that anti-static layers are fixed to the front face and the back face of the PET base material layer respectively, and each anti-static layer sequentially comprises an insulating layer, a conductive layer, an oil storage layer, a moisturizing layer and an outer coating layer from the side close to the PET base material layer to the side away from the PET base material layer; and the PET base material layer and the insulating layer, the insulating layer and the conductive layer, the conductive layer and the oil storage layer, and the oil storage layer and the moisturizing layer are fixedly connected through cementing layers. According to the invention, the antistatic performance is improved, and the surface resistance change of the antistatic film is almost small and the antistatic performance is stable under the condition that the environmental humidity shadow change is large, so that the antistatic film is suitable for complex electronic product process flow and climate, and the probability of electronic product damage is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of protective films, and more specifically, it relates to a PET composite film and a preparation method thereof. Background Art

[0002] In general, the application scenarios of electronic products have anti-static requirements, because the existence of static electricity not only makes the product surface easily adsorb dust, but also affects the accuracy of the circuit, and even causes the circuit to break down during the processing of electronic products, resulting in product failure.

[0003] Existing anti-static films are greatly affected by environmental humidity, and the anti-static performance is unstable. Therefore, due to the large humidity change range in the process flow or use environment of electronic products with anti-static films attached, it brings uncertain risks to the products. Therefore, how to develop an anti-static film with little influence from environmental humidity and stable anti-static performance has become the direction of efforts for those skilled in the art. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, one of the purposes of the present invention is to provide a PET composite film.

[0005] Another purpose of the present invention is to provide a preparation method of the PET composite film.

[0006] The technical solution adopted by the present invention to solve its technical problems is:

[0007] A PET composite film includes a composite film body, and the composite film body includes a PET substrate layer. It is characterized in that anti-static layers are fixed on both the front and back sides of the PET substrate layer. The anti-static layer is successively an insulating layer, a conductive layer, an oil storage layer, a moisture retention layer, and an outer coating layer from the side close to the PET substrate layer to the side away from the PET substrate layer. The PET substrate layer is fixedly connected to the insulating layer, the insulating layer is fixedly connected to the conductive layer, the conductive layer is fixedly connected to the oil storage layer, and the oil storage layer is fixedly connected to the moisture retention layer through adhesive layers.

[0008] Preferably, the insulating layer is made of nitrile rubber material.

[0009] Preferably, the moisture retention layer is made of superabsorbent resin material.

[0010] Preferably, the oil storage layer is made of polypropylene fiber material.

[0011] Preferably, the conductive layer is made of metal compound fiber wire material.

[0012] Preferably, the adhesive layer is made of polyacrylate pressure-sensitive adhesive.

[0013] Preferably, the outer coating layer includes the following components in parts by weight:

[0014]

[0015] A preparation method of a PET composite film, characterized by comprising the following steps:

[0016] a. Subjecting granular PET to raw material melting, casting cooling, and film forming treatments to obtain a PET base material layer;

[0017] b. Subjecting powdered nitrile rubber to raw material melting, casting cooling, and film forming treatments to obtain an insulating layer;

[0018] c. Subjecting granular superabsorbent resin to raw material melting, casting cooling, and film forming treatments to obtain a moisturizing layer;

[0019] d. Weaving polypropylene fibers to obtain a reticular oil storage layer;

[0020] e. Weaving metal compound filaments to obtain a reticular conductive layer.

[0021] f. Putting 100 parts of modified phenolic resin, 3 parts of styrene-phenyl vinyl ether copolymer, 5 parts of benzophenone-1, 5 parts of benzophenone-2, 5 parts of propylene oxide-1, 5 parts of dimethylaminoacetamide-1, 5 parts of propylene oxide condensate, 6 parts of metal powder, 6 parts of graphite powder, 30 parts of deionized water, 1.5 parts of glycerol, and 1.5 parts of potassium nitrate into a container for stirring, and controlling the temperature at 60 - 80 °C to obtain a coating solution. After coating and drying the coating solution, an outer coating layer is formed.

[0022] The beneficial effects of the present invention are as follows: The present invention improves the antistatic performance, and also makes the surface resistance of the antistatic film change very little under the condition of large changes in environmental humidity, and the antistatic performance is stable, so it is suitable for complex electronic product process flows and climates, greatly reducing the probability of damage to electronic products. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a PET composite film of the present invention.

[0024] Reference numerals in the drawings: 1. PET base material layer; 2. Insulating layer; 3. Conductive layer; 4. Oil storage layer; 5. Moisturizing layer; 6. Outer coating layer; 7. Gluing layer. Detailed Embodiments

[0025] The following are specific embodiments to further specifically illustrate the technical solutions of the present invention. It should be understood that the implementation of the present invention is not limited to the following embodiments, and any formal modification and / or change made to the present invention will fall within the protection scope of the present invention.

[0026] In the present invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used can be obtained from the market or are commonly used in the art. The methods in the following examples are conventional methods in the art unless otherwise specified.

[0027] Example:

[0028] A PET composite film, comprising a composite film body, wherein the composite film body includes a PET substrate layer 1. It is characterized in that antistatic layers are fixed on both the front and back sides of the PET substrate layer 1. The antistatic layer, from the side close to the PET substrate layer 1 to the side away from the PET substrate layer 1, is successively an insulating layer 2, a conductive layer 3, an oil storage layer 4, a moisture retention layer 5, and an outer coating layer 6. The PET substrate layer 1 and the insulating layer 2, the insulating layer 2 and the conductive layer 3, the conductive layer 3 and the oil storage layer 4, and the oil storage layer 4 and the moisture retention layer 5 are fixedly connected through an adhesive layer 7.

[0029] Preferably, the insulating layer 2 is made of nitrile rubber material.

[0030] Preferably, the moisture retention layer 5 is made of superabsorbent resin material.

[0031] Preferably, the oil storage layer 4 is made of polypropylene fiber material.

[0032] Preferably, the conductive layer 3 is made of metal compound fiber wire material.

[0033] Preferably, the adhesive layer 7 is made of polyacrylate pressure-sensitive adhesive.

[0034] Preferably, the outer coating layer 6 comprises the following components in parts by weight:

[0035]

[0036]

[0037] A method for preparing a PET composite film, characterized by comprising the following steps:

[0038] a. Melting the granular PET, subjecting it to casting cooling and film forming treatment to obtain the PET substrate layer 1;

[0039] b. Melting the powdered nitrile rubber, subjecting it to casting cooling and film forming treatment to obtain the insulating layer 2;

[0040] c. Melting the granular superabsorbent resin, subjecting it to casting cooling and film forming treatment to obtain the moisture retention layer 5;

[0041] d. Weaving the polypropylene fibers to obtain a net-shaped oil storage layer 4;

[0042] e. Weave the metal compound fiber filaments to obtain a net-shaped conductive layer 3.

[0043] f. Put 100 parts of modified phenolic resin, 3 parts of styrene-phenyl vinyl ether copolymer, 5 parts of benzophenone-1, 5 parts of benzophenone-2, 5 parts of propylene oxide-1, 5 parts of dimethylaminoacetamide-1, 5 parts of propylene oxide condensate, 6 parts of metal powder, 6 parts of graphite powder, 30 parts of deionized water, 1.5 parts of glycerol and 1.5 parts of potassium nitrate into a container and stir, and control the temperature at 60 - 80 °C to obtain a coating solution. After the coating solution is coated and dried, an outer coating layer 6 is formed.

[0044] The setting of the moisture retention layer 5 can effectively increase the humidity of the antistatic layer and increase the dielectric constant of the antistatic layer, thus avoiding the generation of static electricity due to insufficient humidity. The setting of the oil storage layer 4 can effectively maintain the oil content of the antistatic layer. The relatively abundant oil content can reduce the dynamic and static friction coefficients, thus reducing the possibility of static electricity generation. The setting of the conductive layer 3 causes corona discharge between the conductive fibers in the conductive layer 3 to conduct away charges. The cooperation of the moisture retention layer 5, the oil storage layer 4 and the conductive layer 3 perfectly prevents the generation of static electricity. The two insulating layers 2 are respectively fixed on both sides of the PET substrate layer 1, further improving the antistatic performance of the composite film body.

[0045] Comparative Examples 1 - 3:

[0046] The differences between Comparative Examples 1 - 3 and the Examples are only in the components of the outer coating layer. The weight part components of the outer coating layer of Comparative Examples 1 - 3 are shown in Table 1.

[0047] Table 1

[0048]

[0049] The preparation methods of Comparative Examples 1 - 3 are the same as those of the Examples.

[0050] The performances of the composite film bodies prepared in the above Examples and Comparative Examples 1 - 3 are shown in Table 2:

[0051] Table 2

[0052]

[0053]

[0054] The surface impedance was measured for the antistatic layers of the antistatic films of each Example and Comparative Example using a surface impedance test instrument SRM - 110.

[0055] As shown in the evaluation results in Table 2, the antistatic film of the embodiment has excellent antistatic performance. When the environmental humidity changes greatly, the surface resistance hardly changes. In contrast, the antistatic effects of Comparative Examples 1-3 are relatively poor, and the surface resistance fluctuates greatly with the change of humidity.

[0056] Conclusion The present invention not only improves the antistatic performance but also makes the surface resistance of the antistatic film hardly change when the environmental humidity changes greatly, with stable antistatic performance. Therefore, it is suitable for complex electronic product process flows and climates, greatly reducing the probability of damage to electronic products.

[0057] It is necessary to point out here that the above embodiments are only for further elaboration and understanding of the technical solution of the present invention and should not be construed as further limitations on the technical solution of the present invention. Inventions made by those skilled in the art without making prominent substantive features and remarkable progress still fall within the protection scope of the present invention.

Claims

1. A PET composite film, comprising a composite film body, and the composite film body comprises a PET base material layer (1), characterized in that, Anti-static layers are fixed on both the front and back sides of the PET substrate layer (1). The anti-static layer is successively an insulating layer (2), a conductive layer (3), an oil storage layer (4), a moisture retention layer (5), and an outer coating layer (6) from the side close to the PET substrate layer (1) to the side away from the PET substrate layer (1). The PET substrate layer (1) is fixedly connected to the insulating layer (2), the insulating layer (2) is fixedly connected to the conductive layer (3), the conductive layer (3) is fixedly connected to the oil storage layer (4), and the oil storage layer (4) is fixedly connected to the moisture retention layer (5) through adhesive layers (7).

2. A PET composite film according to claim 1, wherein, The insulating layer (2) is made of nitrile rubber material.

3. A PET composite film according to claim 1, characterized in that, The moisture retention layer (5) is made of superabsorbent resin material.

4. A PET composite film according to claim 1, wherein, The oil storage layer (4) is made of polypropylene fiber material.

5. A PET composite film according to claim 1, characterized in that, The conductive layer (3) is made of metal compound fiber filaments material.

6. A PET composite film according to claim 1, characterized in that, The adhesive layer (7) is made of polyacrylate pressure-sensitive adhesive.

7. A PET composite film according to claim 1, characterized in that, The outer coating layer (6) comprises the following components in parts by weight:

8. A method for preparing a PET composite film, characterized in that, Comprising the following steps: a. Granular PET is subjected to raw material melting, casting cooling, and film forming processes to obtain the PET substrate layer (1); b. Powdered nitrile rubber is subjected to raw material melting, casting cooling, and film forming processes to obtain the insulating layer (2); c. Granular superabsorbent resin is subjected to raw material melting, casting cooling, and film forming processes to obtain the moisture retention layer (5); d. Polypropylene fibers are woven to obtain a net-shaped oil storage layer (4); e. Metal compound fiber filaments are woven to obtain a net-shaped conductive layer (3). f. 100 parts of modified phenolic resin, 3 parts of styrene-phenyl vinyl ether copolymer, 5 parts of benzophenone-1, 5 parts of benzophenone-2, 5 parts of propylene oxide-1, 5 parts of dimethylaminoacetamide-1, 5 parts of propylene oxide condensate, 6 parts of metal powder, 6 parts of graphite powder, 30 parts of deionized water, 1.5 parts of glycerol, and 1.5 parts of potassium nitrate are placed in a container and stirred, and the temperature is controlled at 60 - 80 °C to obtain a coating solution. After the coating solution is coated and dried, the outer coating layer (6) is formed.

Images