CN214142181U

CN214142181U - Release film for AB adhesive film

Info

Publication number: CN214142181U
Application number: CN202022869451.2U
Authority: CN
Inventors: 吴培服; 王琪; 池卫
Original assignee: Jiangsu Shuangxing Color Plastic New Materials Co Ltd
Current assignee: Jiangsu Shuangxing Color Plastic New Materials Co Ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-09-07
Anticipated expiration: 2030-12-03

Abstract

The utility model discloses a from type membrane for AB glue membrane, the AB glue membrane includes AB glue base material and sets up low glue film and the high glue film in the both sides of AB glue base material respectively, the surface of low glue film and high glue film is attached respectively to have low glue film from type membrane and high glue film from type membrane, wherein, the thickness of low glue film from type membrane is 20.5 ~ 55.5 mu m, high glue film is 25.5 ~ 98.5 mu m from the thickness of type membrane. The utility model provides a unified solution's three kinds are applicable to AB glue membrane from type membrane, and it adopts the alkyl acrylate of different chain lengths as the active monomer diluent, utilizes the alkyl acrylate of different chain lengths to adjust from the type force, therefore can adopt approximate content proportion and same technology preparation, has reduced research and development and manufacturing cost.

Description

Release film for AB adhesive film

Technical Field

The utility model relates to a protection film technology field especially relates to a from type membrane for AB glue membrane.

Background

The AB glue is a special double-sided glue for protecting toughened glass, which takes optical-grade PET (polyester film) as a base material, one side (A side) of the base material is coated with silica gel, and the other side (B side) of the base material is coated with OCA optical glue. The surface A silica gel is low in viscosity, easy to replace and separate and used for attaching a protection object; the OCA optical cement on the B surface is a high-viscosity cement layer, has good adhesiveness and is used for attaching a protective layer. Because of its adhesive properties on both sides, release films need to be applied to both sides during the manufacturing process to protect them from each other when rolled.

CN 110982437A discloses a preparation method of an AB adhesive film. Including first from type layer, first adhesive layer, second adhesive layer and second from the type layer, first adhesive layer, second adhesive layer arrange from top to bottom and directly bond together, the upside on first adhesive layer bonds and has first from the type layer, the downside on second adhesive layer bonds and has the second is from the type layer. The preparation method of the AB glue film in the prior art comprises the following steps: step one, preparing a first adhesive layer: coating an acrylic acid adhesive solution for preparing a first adhesive layer on the first release layer in a micro-concave, comma shaft or slit extrusion mode, drying the acrylic acid adhesive solution by an oven, and then laminating and rolling the acrylic acid adhesive solution and an engineering film to prepare the first adhesive layer, wherein the first adhesive layer is adhered to the lower side surface of the first release layer; step two, preparing a second adhesive layer: stripping the engineering film, coating the prepared organic silicon adhesive on the prepared first adhesive layer in a comma shaft or slit extrusion mode, drying the organic silicon adhesive by an oven, and then laminating and rolling the organic silicon adhesive with a second release layer, wherein the organic silicon adhesive forms a second adhesive layer and is positioned between the first adhesive layer and the second release layer; and finally, curing, namely placing the four layers of composite adhesive films formed in the second step in a drying oven at 40-50 ℃, and placing for 2-3 d for curing, so that the first release layer, the first adhesive layer, the second adhesive layer and the second release layer are connected together. The first release layer and the second release layer can be fluorine release films, silicon release films or non-silicon release films. The release film in the prior art gives three surface treatment methods, namely silicon series, non-silicon series and fluorine series, and covers all the surface treatment methods of the release film in the prior art. The release film is mainly used for protecting the adhesive layer and needs to be peeled off when in use, so that the release film can not be peeled off together with the adhesive layer when being peeled off, and the release film has certain requirements on release effect, adhesive force, peeling force and the like.

Fig. 1 shows a schematic cross-sectional structure diagram of an AB adhesive film roll in a state, which includes an AB adhesive base material 100 and a low adhesive layer 101 and a high adhesive layer 102 respectively disposed on two sides of the AB adhesive base material 100, wherein the outer surfaces of the low adhesive layer 101 and the high adhesive layer 102 are respectively adhered with a low adhesive layer release film 1011 and a high adhesive layer release film 1021. Since one side of the AB adhesive film is the high adhesive layer 102 and the other side is the low adhesive layer 101, if the fitting is adhered to one side of the low adhesive layer 101, the low adhesive layer 101 will be torn off from the adhered fitting when the high adhesive layer 102 is released. If the high adhesive layer 102 is adhered first, there is a strong possibility that the low adhesive layer 101 is released from the release film first when the high adhesive layer 102 is released. Therefore, four release films are required for releasing the AB adhesive film in general. The specific distinction is as follows: (1) the high-viscosity adhesive layer is firstly released, and the high-viscosity adhesive layer and the low-viscosity adhesive layer respectively comprise release films with light release force and release films with medium release force; (2) the low-viscosity adhesive layer is firstly released, and the low-viscosity adhesive layer comprises a release film with medium release force for the high-viscosity adhesive layer and a release film with light release force for the low-viscosity adhesive layer. Among them, the release films in the prior art are generally release films having a light release force to a low adhesive layer, and the other three release films do not provide a uniform solution in the prior art.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a from type membrane for AB glue membrane to reduce or avoid the aforementioned problem.

In order to solve the technical problem, the utility model provides a from type membrane for AB glue membrane, the AB glue membrane includes AB glue base material and sets up low glue film and the high glue film in the both sides of AB glue base material respectively, the surface of low glue film and high glue film is pasted respectively to have low glue film to leave type membrane and high glue film from type membrane, a serial communication port, the thickness that low glue film leaves type membrane is 20.5 ~ 55.5 mu m, high glue film is 25.5 ~ 98.5 mu m from the thickness of type membrane.

Preferably, the thickness of the AB glue base material is 159-496 mu m, the thickness of the low-viscosity glue layer is 8.5-20.5 mu m, and the thickness of the high-viscosity glue layer is 10.5-30.5 mu m.

Preferably, the low-adhesive-layer release film comprises a release film substrate and a release agent layer coated on the surface of the release film substrate, the thickness of the release film substrate of the low-adhesive-layer release film is 15-20 μm, and the thickness of the release agent layer of the low-adhesive-layer release film is 5.5-35.5 μm.

Preferably, the high-viscosity adhesive layer release film comprises a release film substrate and a release agent layer coated on the surface of the release film substrate, the thickness of the release film substrate of the high-viscosity adhesive layer release film is 15-20 μm, and the thickness of the release agent layer of the high-viscosity adhesive layer release film is 10.5-78.5 μm.

The utility model provides a unified solution's three kinds are applicable to AB glue membrane from type membrane, and it adopts the alkyl acrylate of different chain lengths as the active monomer diluent, utilizes the alkyl acrylate of different chain lengths to adjust from the type force, therefore can adopt approximate content proportion and same technology preparation, has reduced research and development and manufacturing cost.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein the content of the first and second substances,

FIG. 1 is a schematic view showing a cross-sectional structure of an AB adhesive film roll usable in the present invention;

fig. 2 is a schematic structural diagram of a release film for an AB adhesive film according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a release film according to another embodiment of the present invention;

fig. 4 is a schematic structural diagram of a release film according to another embodiment of the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.

The following description will explain the release film of the present invention in detail by taking the AB glue film shown in fig. 1 as an example. As described in the background art, the AB glue film includes an AB glue base 100 and a low glue layer 101 and a high glue layer 102 respectively disposed on two sides of the AB glue base 100, and a low glue layer release film 1011 and a high glue layer release film 1021 are respectively attached to outer surfaces of the low glue layer 101 and the high glue layer 102.

The AB glue film corresponds to the high-viscosity glue layer and the low-viscosity glue layer on two sides, four types of release films including a high-viscosity glue layer first release type and a low-viscosity glue layer first release type can be obtained, and of the four types of release films, the release film with light release force on the low-viscosity glue layer is the most common release film, and the existing release film can be adopted.

Therefore the utility model discloses pay attention to provide a unified solution, it can provide respectively to have to the high viscose layer light from type membrane of type power, have to the low viscose layer in from type membrane of type power and to have to the high viscose layer in from type membrane of type power.

In one embodiment, the thickness of the AB glue base material 100 is preferably 159-496 μm, the thickness of the low-viscosity glue layer 101 is preferably 8.5-20.5 μm, the thickness of the high-viscosity glue layer 102 is preferably 10.5-30.5 μm, the thickness of the low-viscosity glue layer release film 1011 is preferably 20.5-55.5 μm, and the thickness of the high-viscosity glue layer release film 1021 is preferably 25.5-98.5 μm.

Fig. 2 is a schematic structural diagram of a release film for an AB adhesive film according to an embodiment of the present invention, which includes a release film substrate 10 and a release agent layer 20 coated on the surface of the release film substrate 10. The release film shown in fig. 2 is a basic structure, which can be commonly used for the above three types of release films.

That is, for the specific structure of the AB adhesive film shown in fig. 1, the low adhesive layer release film 1011 can include a release film substrate 10 and a release agent layer 20 coated on the surface of the release film substrate 10; the structure of the high-adhesive release film 1021 may also include a release film substrate 10 and a release agent layer 20 coated on the surface of the release film substrate 10. In one embodiment, the thickness of the release film substrate 10 of the low-adhesive-layer release film 1011 is preferably 15 to 20 μm, and the thickness of the release agent layer 20 of the low-adhesive-layer release film is preferably 5.5 to 35.5 μm. In another embodiment, the thickness of the release film substrate 10 of the high-tack adhesive layer release film 1021 is preferably 15 to 20 μm, and the thickness of the release agent layer 20 of the high-tack adhesive layer release film 1021 is preferably 10.5 to 78.5 μm.

Corresponding to aforementioned three kinds from the type membrane, the utility model discloses three kinds of release agents are provided respectively, through the release agent of three kinds of differences, prepare respectively and obtain the release agent layer 20 that is applicable to three kinds of type membranes.

Of course, it will be understood by those skilled in the art that most of the components and formation principles of the three release agents of the present invention are the same, and that some of the components are finely adjusted to meet different requirements to reduce development and manufacturing costs.

Example 1

The embodiment provides a release film with a light release force suitable for being attached to a high-viscosity adhesive layer 102 shown in fig. 1, which has a specific structure shown in fig. 2, and includes a release film substrate 10 and a release agent layer 20 coated on the surface of the release film substrate 10, where the release agent layer 20 is made of release agent prepared from the following raw materials in parts by weight:

60-140 parts of polybutadiene polyurethane, 45-85 parts of polyacrylate resin, 10-25 parts of hydroxypropyl methacrylate, 25-55 parts of trifluoroethyl methacrylate reactive monomer diluent, 20-25 parts of 2-methyl-2-docosyl acrylate reactive monomer diluent and 1-5 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone as an initiator.

The release agent of the embodiment 1 is an ultraviolet curing release agent without silicone oil components, does not need high-temperature baking, does not have silicone oil exudation, and avoids the phenomenon that high-viscosity glue or low-viscosity glue is pulled up due to silicone oil component transfer. The utility model discloses a compound active monomer diluent to contain short chain fluorine monomer to improve from type force, adjust from type force with the long chain alkyl acrylate of docosane, to this preparation from type membrane to high viscose, the adhesion force is high but lower from type force, from type performance excellent.

Example 2

The embodiment provides a release film with a medium release force, which is suitable for being attached to a low-viscosity adhesive layer 101 shown in fig. 1, and the specific structure of the release film can be shown in fig. 2, and includes a release film substrate 10 and a release agent layer 20 coated on the surface of the release film substrate 10, where the release agent layer 20 is made of release agents prepared from the following raw materials in parts by weight:

60-140 parts of polybutadiene polyurethane, 45-85 parts of polyacrylate resin, 10-25 parts of hydroxypropyl methacrylate, 25-55 parts of trifluoroethyl methacrylate reactive monomer diluent, 20-25 parts of octadecyl methacrylate reactive monomer diluent, and 1-5 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone as an initiator.

The release agent of embodiment 2 is an ultraviolet light curing release agent without silicone oil component, does not need high temperature baking, has no silicone oil exudation, and avoids the phenomenon that high-viscosity glue or low-viscosity glue is pulled up due to silicone oil component transfer. The utility model discloses a compound active monomer diluent to containing short chain fluorine monomer improves from type force, adjust from type force with the long chain alkyl acrylate of octadecane, with this preparation from type membrane from type force in the moderate and adhesive force higher, from type performance excellent.

Example 3

The embodiment provides a release film suitable for being attached to the surface of a high-viscosity adhesive layer 101 shown in fig. 1 and having a medium release force on a high-viscosity adhesive layer, and the specific structure of the release film can be shown in fig. 2, and the release film comprises a release film substrate 10 and a release agent layer 20 coated on the surface of the release film substrate 10, wherein the release agent layer 20 is made of release agents prepared from the following raw materials in parts by weight:

60-140 parts of polybutadiene polyurethane, 45-85 parts of polyacrylate resin, 10-25 parts of hydroxypropyl methacrylate, 25-55 parts of trifluoroethyl methacrylate reactive monomer diluent, 20-25 parts of dodecyl methacrylate reactive monomer diluent, and 1-5 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone as an initiator.

The release agent of embodiment 3 is an ultraviolet light curing release agent without silicone oil component, does not need high temperature baking, has no silicone oil exudation, and avoids the phenomenon that high-viscosity glue or low-viscosity glue is pulled up due to silicone oil component transfer. The utility model discloses a compound active monomer diluent to containing short chain fluorine monomer improves from type force, adjust from type force with dodecyl acrylate, with this preparation from type membrane from type force in the moderate and adhesive force higher, from the type performance excellent.

As described above, in order to save research and development and manufacturing costs, examples 1 to 3 provide three different release agents, and the three release agents are different in that alkyl acrylates with different chain lengths are used as reactive monomer diluents, and the release force is adjusted by using the alkyl acrylates with different chain lengths, so that similar content ratios and the same process can be adopted for preparation, thereby providing a uniform solution for the AB adhesive film.

The following describes in detail a method for producing a release film suitable for use in examples 1 to 3 by way of specific examples.

Example 4

And (3) uniformly mixing the components of the release agent except the initiator according to the formula of the previous embodiment, finally adding the initiator, and magnetically stirring for 120 seconds to obtain the release agent.

Uniformly coating the release agent on the surface of a release film substrate 10, defoaming in vacuum for 1 hour, N₂And curing for 120 seconds by ultraviolet irradiation under the condition to form a release agent layer.

Example 5

This embodiment is to improving from the structure of type membrane substrate 10, for example, the utility model discloses can be used for coating from the surface of type agent layer 20 on type membrane substrate 10, formed one deck activated coating 30, as shown in fig. 3, it shows according to the utility model discloses a structural schematic diagram of another embodiment from type membrane. The purpose of the active coating 30 is to improve the adhesion of the release agent 20, so as to facilitate the combination with the release agent without silicone oil component, and avoid the phenomenon that the silicone oil component is transferred to the high adhesive layer 102 to cause the high adhesive layer 102 to be pulled up.

The release film substrate 10 is preferably made of a biaxially oriented PET film, and may be a single layer structure as shown in fig. 3, or a multi-layer composite structure as shown in fig. 4, wherein fig. 4 shows a schematic structural diagram of a release film according to another embodiment of the present invention. In the embodiment shown in fig. 4, the release film substrate 10 of the present invention is a three-layer co-extruded composite polyester film, which may include a surface layer 11, a bottom layer 12 and a middle layer 13 sandwiched therebetween. The activation coat 30 is formed on the outer surface of the skin layer 11 of the mylar film. The release agent is coated on the surface of the activated coating 30 to form a release agent layer 20. The composition of the release film substrate 10 of the single-layer structure shown in fig. 3 is preferably the same as that of the surface layer 11 of the release film substrate 10 of the three-layer co-extruded composite structure shown in fig. 4.

The washcoat 30 of the present invention may comprise the following components: acrylic resin, dimethyl silyl silica surfactant, ethanolamine surface etching agent, polyquaternium surface active bactericide, water-insoluble carbonate, melamine curing agent and propylene glycol solvent.

The ethanolamine surface etching agent can degrade and erode the outer surface of the release film substrate 10 to a certain extent, so that the flatness of the outer surface of the release film substrate 10 is reduced, and the hydrophilic component in the active coating 30 is favorably and firmly combined with the release film substrate 10; furthermore, ethanolamine is prone to decompose during the coating curing process, which can cause the washcoat 30 to form a fluffy, porous structure. The acrylic resin has hydrophilicity, is further emulsified by the dimethylsilylated silica surfactant, and the silicon-containing surfactant and the release film substrate 10 can obtain strong binding force. The polyquaternium surface active bactericide can reduce the surface tension of the cured coating surface, improve the adsorption capacity of the coating to the release agent containing long-chain silane, avoid the release agent from being separated, and the polyquaternium has a sterilization function, so that the release agent layer 20 can be kept in a use state for a long time. Compared with other curing agents, the melamine is not sensitive to moisture and has better affinity with a release agent containing long-chain silane. The water-insoluble carbonate can be selected from calcium carbonate or magnesium carbonate, and is required to avoid reaction with ethanolamine and dissolution in water and other water-soluble components.

In one embodiment, the washcoat coating 30 of the present invention comprises 80-100 parts by weight of acrylic resin, 1-2 parts by weight of dimethylsilylated silica, 10-15 parts by weight of ethanolamine, 0.5-0.8 parts by weight of polyquaternium, 5-10 parts by weight of water-insoluble carbonate, 1-2 parts by weight of melamine, and 80-100 parts by weight of propylene glycol.

The above activated coating of the present invention can be prepared by the following steps.

Firstly, uniformly mixing 80-100 parts by weight of acrylic resin, 1-2 parts by weight of dimethyl silylated silica, 10-15 parts by weight of ethanolamine, 0.5-0.8 part by weight of polyquaternary ammonium salt, 5-10 parts by weight of water-insoluble carbonate, 1-2 parts by weight of melamine and 80-100 parts by weight of propylene glycol, coating the mixture on the outer surface of a release film substrate 10 by a spin coating or spray coating mode, and curing at 70-120 ℃ for 1-2 hours, thereby obtaining a precoating layer on the outer surface of the release film substrate 10.

In a specific embodiment, the thickness of the precoat is 5-10 μm, and the water-insoluble carbonate added is preferably calcium carbonate or magnesium carbonate with a particle size of 0.5-1.0 μm.

Thereafter, the precoat layer is subjected to a plasma surface activation treatment. The plasma surface activation treatment is a common treatment mode in the field, the activation treatment is carried out through oxygen in one embodiment of the utility model, the oxygen flow is not less than 100sccm, and the time of 0.1-0.2mbar is 30-60 s.

Then, the precoat layer after the activation treatment is subjected to acid washing. Preferably, the precoat layer is soaked by 6-8mol/L hydrochloric acid at 50-60 ℃ for 10-20 minutes. Through acid washing, the exposed carbonate component on the precoating layer can be partially dissolved, a porous structure can be further obtained, the surface activity of the coating is further improved, and the subsequent close combination with a release agent is facilitated.

Finally, washing and drying with water to obtain the activated coating 30 of the utility model. Washing with water for 10-20 min, and oven drying at 50-60 deg.C for 30 min.

Through the utility model discloses a from the porous hydrophilicity activated coating 30 of the surface formation of type membrane substrate 10, the surface activity and the hydrophilicity from type membrane substrate 10 improve greatly, are favorable to and contain long chain silane mold release inseparable bonding, can avoid the mold release to break away from.

To sum up, the utility model provides a three kinds of release film that are applicable to the AB glue membrane of unified solution, its alkyl acrylate that adopts different chain lengths adjusts from the type force as active monomer diluent, utilizes the alkyl acrylate of different chain lengths, therefore can adopt approximate content proportion and same technology preparation, and the release of preparation does not have the silicone oil composition in addition, does not need high temperature to toast, has stopped the transfer phenomenon of silicone oil composition. The utility model discloses a compound active monomer diluent to containing short chain fluorine monomer to improve from type force, adjust centrifugal force with long chain alkyl acrylate, with this preparation from type membrane from type force lower and adhesive force higher, from type performance excellent.

It should be appreciated by those skilled in the art that while the present application is described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is thus given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including all technical equivalents which are encompassed by the claims and are to be interpreted as combined with each other in a different embodiment so as to cover the scope of the present application.

The above description is only illustrative of the present invention and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of this application shall fall within the scope of this application.

Claims

1. A release film for an AB adhesive film comprises an AB adhesive base material, and a low-adhesive-layer release film and a high-adhesive-layer release film which are respectively arranged on two sides of the AB adhesive base material, wherein the outer surfaces of the low-adhesive-layer release film and the high-adhesive-layer release film are respectively adhered with the low-adhesive-layer release film and the high-adhesive-layer release film, and the release film is characterized in that the thickness of the low-adhesive-layer release film is 20.5-55.5 micrometers, and the thickness of the high-adhesive-layer release film is 25.5-98.5 micrometers; the thickness of the AB glue base material is 159-496 mu m, the thickness of the low-viscosity glue layer is 8.5-20.5 mu m, and the thickness of the high-viscosity glue layer is 10.5-30.5 mu m; the low-adhesive-layer release film comprises a release film substrate and a release agent layer coated on the surface of the release film substrate, the thickness of the release film substrate of the low-adhesive-layer release film is 15-20 micrometers, and the thickness of the release agent layer of the low-adhesive-layer release film is 5.5-35.5 micrometers.

2. The release film for an AB glue film as claimed in claim 1, wherein the high-viscosity adhesive layer release film comprises a release film substrate and a release agent layer coated on the surface of the release film substrate, the thickness of the release film substrate of the high-viscosity adhesive layer release film is 15-20 μm, and the thickness of the release agent layer of the high-viscosity adhesive layer release film is 10.5-78.5 μm.