Printing antistatic polyester release film and preparation method thereof

Abstract

The invention relates to a printing antistatic polyester release film, which is characterized by comprising a three-layer composite structure prepared by an external addition method, and the three-layer structure comprises a release coating, an antistatic coating and a PET base material; or the anti-static release film comprises a two-layer structure prepared by an internal addition method, and the two-side structure comprises an anti-static release coating and a PET (Polyethylene Terephthalate) substrate. According to the invention, the carbon nanotube material is used as a conductive substance, and the antistatic film with excellent conductivity and high light transmittance can be obtained through a rod coating method.

Description

Technical Field

[0001] The invention relates to the technical field of antistatic release films, and in particular to a printed antistatic polyester release film and a preparation method thereof. Background Art

[0002] During the transportation or use of products such as glass, high-grade plates, and electronic products, the surface is easily contaminated or scratched by contact, so a protective film is used to cover the surface to avoid contamination or damage. Generally, plastic film is used, but the dielectric constant of plastic film is small, it is a non-conductor, and the insulation performance is high, so static electricity will be generated. However, static charge accumulates on the surface of plastic film, which is easy to cause dust adsorption on the surface, and even cause discharge, causing fire. Therefore, in order to avoid static electricity accumulation on the surface of plastic film, plastic film is usually treated with antistatic to enhance its conductive properties. Conventional antistatic treatment is to coat plastic film with antistatic agent, but with current technology, the antistatic performance of treated plastic film is not stable enough and the retention time is short. Especially when the ambient humidity decreases, the antistatic performance of plastic film will deteriorate, that is, the conductivity will decrease or even fail. Summary of the invention

[0003] The object of the present invention is to provide a printed antistatic polyester release film and a preparation method thereof, so as to solve the above technical problems.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A printed antistatic polyester release film, characterized in that it comprises a three-layer composite structure prepared by an external addition method, wherein the three-layer structure is a release coating, an antistatic coating and a PET substrate; or comprises a two-layer structure prepared by an internal addition method, wherein the structures on both sides are an antistatic release coating and a PET substrate.

[0006] The present invention also provides a method for preparing a printed antistatic polyester release film, which is characterized by comprising the following steps:

[0007] S100, preparing a PET substrate;

[0008] S200, preparing an antistatic coating layer, wherein the antistatic coating layer is prepared by the following method:

[0009] Method 1: Weigh single-walled carbon nanotube powder, polyvinyl pyrrolidone, sodium cholate and deionized water respectively to prepare an antistatic coating layer;

[0010] Method 2: Weigh multi-walled carbon nanotube powder, dispersant and ethyl acetate respectively to prepare ethyl acetate dispersion of multi-walled carbon nanotubes;

[0011] S300, preparing a release coating layer;

[0012] S400, coating the aqueous dispersion of single-walled carbon nanotubes prepared in method one on a PET substrate to form an antistatic PET film, and then coating a release coating layer on the antistatic PET film; or combining the ethyl acetate dispersion of multi-walled carbon nanotubes prepared in method two with a release coating layer and then coating them on a PET film.

[0013] The present invention further provides that when preparing the PET substrate, AZO nano powder is added.

[0014] The present invention is further arranged that the contents of single-walled carbon nanotube powder, polyvinyl pyrrolidone, sodium cholate and deionized water in method one are respectively: 2-4g, 2-4g, 2-4g, 300-50ml, and then added into a ball kettle and ball milled for 48h to obtain a single-walled carbon nanotube dispersion uniformly dispersed in water, to obtain an aqueous dispersion of single-walled carbon nanotubes, wherein the mass fraction of the single-walled carbon nanotubes is 0.05%.

[0015] The present invention further arranges that the contents of the multi-walled carbon nanotube powder, the dispersant and 400 mL of ethyl acetate in the second method are respectively: 2-4 g, 4-5 g and 300-50 ml; and the mass fraction of the ethyl acetate dispersion of the multi-walled carbon nanotubes obtained is 1%-2%.

[0016] The present invention is further configured that the single-walled carbon nanotube aqueous dispersion is coated on the corona-treated side of the PET using a wire rod coater, and after coating, it is placed in a 70°C oven for drying for 90 seconds to obtain CNT-coated PET films of different thicknesses, which are dried and then subjected to ablation treatment: after washing with water, they are placed in a 40% by mass nitric acid solution or deionized water for post-treatment for 24 hours, and then washed with water and dried to form an acid-treated antistatic PET film or a water-treated antistatic PET film.

[0017] The present invention is further configured to weigh 5 g of organic silicone resin, add 5 mL of toluene solvent, add 0.1 g of platinum catalyst dropwise under magnetic stirring, and continue stirring for 5 minutes to obtain the release coating.

[0018] The present invention is further arranged that the release coating is coated on the antistatic PET film from top to bottom by a glass rod, and after coating, it is placed in an oven at 95°C for drying, the total air volume in the oven is controlled to be 25000m3 / h, and the drying time is 90s to obtain the target antistatic release coating.

[0019] The present invention further arranges that the organic silicone resin, the ethyl acetate dispersion of the multi-walled carbon nanotubes, the platinum catalyst, 0.06 g of the anchoring agent, and 0.07 g of the cross-linking agent are weighed, mixed, and stirred for 20 minutes to obtain the antistatic release coating.

[0020] The present invention further provides that the prepared antistatic release coating is coated on the corona-treated side of PET using wire rod coaters of different types, and after coating, it is placed in an oven at 95° C. and dried for 210 seconds to obtain antistatic release coatings of different thicknesses.

[0021] Beneficial effects of the present invention: The present invention uses carbon nanotube material as a conductive material and can obtain an antistatic film with excellent conductive properties and high light transmittance through a rod coating method. DETAILED DESCRIPTION

[0022] The following will explain the implementation methods of the present application in detail with reference to examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0023] Embodiment 1:

[0024] The present embodiment provides a printed antistatic polyester release film, characterized in that it includes a three-layer composite structure prepared by an external addition method, wherein the three-layer structure is a release coating, an antistatic coating and a PET substrate; or includes a two-layer structure prepared by an internal addition method, wherein the structures on both sides are an antistatic release coating and a PET substrate.

[0025] Embodiment 2:

[0026] The present invention also provides a method for preparing a printed antistatic polyester release film, which is characterized by comprising the following steps:

[0027] S100, preparing a PET substrate;

[0028] S200, preparing an antistatic coating layer, wherein the antistatic coating layer is prepared by the following method:

[0029] Method 1: Weigh single-walled carbon nanotube powder, polyvinyl pyrrolidone, sodium cholate and deionized water respectively to prepare an antistatic coating layer;

[0030] Method 2: Weigh multi-walled carbon nanotube powder, dispersant and ethyl acetate respectively to prepare ethyl acetate dispersion of multi-walled carbon nanotubes;

[0031] S300, preparing a release coating layer;

[0032] S400, coating the aqueous dispersion of single-walled carbon nanotubes prepared in method one on a PET substrate to form an antistatic PET film, and then coating a release coating layer on the antistatic PET film; or combining the ethyl acetate dispersion of multi-walled carbon nanotubes prepared in method two with a release coating layer and then coating them on a PET film.

[0033] The present invention further provides that when preparing the PET substrate, AZO nano powder is added.

[0034] The present invention is further arranged that the contents of single-walled carbon nanotube powder, polyvinyl pyrrolidone, sodium cholate and deionized water in method one are respectively: 2-4g, 2-4g, 2-4g, 300-50ml, and then added into a ball kettle and ball milled for 48h to obtain a single-walled carbon nanotube dispersion uniformly dispersed in water, to obtain an aqueous dispersion of single-walled carbon nanotubes, wherein the mass fraction of the single-walled carbon nanotubes is 0.05%.

[0035] The present invention further arranges that the contents of the multi-walled carbon nanotube powder, the dispersant and 400 mL of ethyl acetate in the second method are respectively: 2-4 g, 4-5 g and 300-50 ml; and the mass fraction of the ethyl acetate dispersion of the multi-walled carbon nanotubes obtained is 1%-2%.

[0036] The present invention is further configured that the single-walled carbon nanotube aqueous dispersion is coated on the corona-treated side of the PET using a wire rod coater, and after coating, it is placed in a 70°C oven for drying for 90 seconds to obtain CNT-coated PET films of different thicknesses, which are dried and then subjected to ablation treatment: after washing with water, they are placed in a 40% by mass nitric acid solution or deionized water for post-treatment for 24 hours, and then washed with water and dried to form an acid-treated antistatic PET film or a water-treated antistatic PET film.

[0037] The present invention is further configured to weigh 5 g of silicone resin, add 5 mL of toluene solvent, add 0.1 g of platinum catalyst dropwise under magnetic stirring, and continue stirring for 5 minutes to obtain the release coating.

[0038] The present invention is further arranged that the release coating is coated on the antistatic PET film from top to bottom by a glass rod, and after coating, it is placed in an oven at 95°C for drying, the total air volume in the oven is controlled to be 25000m3 / h, and the drying time is 90s to obtain the target antistatic release coating.

[0039] The present invention further arranges that the organic silicone resin, the ethyl acetate dispersion of the multi-walled carbon nanotubes, the platinum catalyst, 0.06 g of the anchoring agent, and 0.07 g of the cross-linking agent are weighed, mixed, and stirred for 20 minutes to obtain the antistatic release coating.

[0040] The present invention further provides that the prepared antistatic release coating is coated on the corona-treated side of PET using wire rod coaters of different types, and after coating, it is placed in an oven at 95° C. and dried for 210 seconds to obtain antistatic release coatings of different thicknesses.

[0041] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0042] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0043] The above description shows and describes several preferred embodiments of the present invention, but as before, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept of this article through the above teachings or the technology or knowledge of the relevant field. And the changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A printed antistatic polyester release film, characterized in that: It includes a three-layer composite structure prepared by an external addition method, wherein the three-layer structure is a release coating, an antistatic coating and a PET substrate; or it includes a two-layer structure prepared by an internal addition method, wherein the structures on both sides are an antistatic release coating and a PET substrate.

2. A method for preparing a printed antistatic polyester release film, characterized in that: The steps include: S100, preparing a PET substrate; S200, preparing an antistatic coating layer, wherein the antistatic coating layer is prepared by the following method: Method 1: Weigh single-walled carbon nanotube powder, polyvinyl pyrrolidone, sodium cholate and deionized water respectively to prepare an antistatic coating layer; Method 2: Weigh multi-walled carbon nanotube powder, dispersant and ethyl acetate respectively to prepare ethyl acetate dispersion of multi-walled carbon nanotubes; S300, preparing a release coating layer; S400, coating the aqueous dispersion of single-walled carbon nanotubes prepared in method one on a PET substrate to form an antistatic PET film, and then coating a release coating layer on the antistatic PET film; or combining the ethyl acetate dispersion of multi-walled carbon nanotubes prepared in method two with a release coating layer and then coating them on a PET film.

3. The method for preparing a printed antistatic polyester release film according to claim 2, characterized in that: When preparing the PET substrate, AZO nanopowder is added.

4. The method for preparing a printed antistatic polyester release film according to claim 2, characterized in that: In method one, the contents of single-walled carbon nanotube powder, polyvinyl pyrrolidone, sodium cholate, and deionized water are: 2-4g, 2-4g, 2-4g, 300-50ml, respectively. Then they are added into a ball kettle and ball milled for 48h to obtain a single-walled carbon nanotube dispersion uniformly dispersed in water, thereby obtaining an aqueous dispersion of single-walled carbon nanotubes, in which the mass fraction of the single-walled carbon nanotubes is 0.05%.

5. The method for preparing a printed antistatic polyester release film according to claim 2, characterized in that: In method 2, the contents of multi-walled carbon nanotube powder, dispersant and 400 mL of ethyl acetate are respectively: 2-4 g, 4-5 g and 300-50 ml; the mass fraction of the ethyl acetate dispersion of multi-walled carbon nanotubes obtained is 1%-2%.

6. The method for preparing a printed antistatic polyester release film according to claim 4, characterized in that: The single-walled carbon nanotube aqueous dispersion is coated on the corona-treated side of PET using a wire rod coater, and then placed in a 70°C oven for drying for 90 seconds to obtain CNT-coated PET films of different thicknesses. After drying, they are subjected to ablation treatment: after washing with water, they are placed in a 40% by mass nitric acid solution or deionized water for post-treatment for 24 hours, and then washed with water and dried to form an acid-treated antistatic PET film or a water-treated antistatic PET film.

7. The method for preparing a printed antistatic polyester release film according to claim 6, characterized in that: Weigh 5 g of silicone resin, add 5 mL of toluene solvent, add 0.1 g of platinum catalyst dropwise under magnetic stirring, and continue stirring for 5 minutes to obtain the release coating.

8. The method for preparing a printed antistatic polyester release film according to claim 7, characterized in that: The release coating is applied from top to bottom on the antistatic PET film by a glass rod. After coating, it is placed in an oven at 95°C for drying. The total air volume in the oven is controlled at 25000m 3 / h, drying time is 90s, and the target antistatic release coating is obtained.

9. The method for preparing a printed antistatic polyester release film according to claim 5, characterized in that: The silicone resin, the ethyl acetate dispersion of multi-walled carbon nanotubes, the platinum catalyst, 0.06 g of the anchoring agent, and 0.07 g of the cross-linking agent were weighed, mixed, and stirred for 20 minutes to prepare an antistatic release coating.

10. The method for preparing a printed antistatic polyester release film according to claim 9, characterized in that: The prepared antistatic release coating was coated on the corona-treated side of PET using wire rod coaters of different types. After coating, it was placed in an oven at 95° C. to dry for 210 seconds to obtain antistatic release coatings of different thicknesses.