阅读说明：本技术 一种高亮度的棱镜贴合膜及其制备方法 (High-brightness prism laminating film and preparation method thereof ) 是由 翟才金 季文静 丁利明 于 2021-01-05 设计创作，主要内容包括：本发明公开了一种高亮度的棱镜贴合膜及其制备方法,从下往上依次包括背涂层、PET层、第一棱镜层、第二棱镜层,第一棱镜层和第二棱镜层上均阵列设置有棱镜,第一棱镜层的棱镜的顶角插入第二棱镜层的下表面,第一棱镜层的棱镜纵向延伸方向与第二棱镜层的棱镜纵向延伸方向呈90°夹角,第一棱镜层的棱镜高度为20～44μm,第一棱镜层的各棱镜顶点的高度差为0.5～2μm,第二棱镜层的棱镜高度为20～44μm,第二棱镜层的各棱镜等高设置,背涂层的雾度为2～10％。本发明简化现有技术中的双层PET层结构,减少整个模组内的光线干涉现象,从而降低了光损失,显著提高棱镜贴合膜的辉度,又简化了制备流程及组装工序,节约成本。(The invention discloses a high-brightness prism laminating film and a preparation method thereof, and the high-brightness prism laminating film sequentially comprises a back coating, a PET (polyethylene terephthalate) layer, a first prism layer and a second prism layer from bottom to top, wherein prisms are arranged on the first prism layer and the second prism layer in an array mode, the vertex angles of the prisms of the first prism layer are inserted into the lower surface of the second prism layer, the longitudinal extension direction of the prisms of the first prism layer and the longitudinal extension direction of the prisms of the second prism layer form an included angle of 90 degrees, the height of the prisms of the first prism layer is 20-44 mu m, the height difference of the vertexes of the prisms of the first prism layer is 0.5-2 mu m, the height of the prisms of the second prism layer is 20-44 mu m, the heights of the prisms of the second prism layer are equal, and the haze of the back coating is 2-10%. The invention simplifies the double-layer PET layer structure in the prior art, reduces the light interference phenomenon in the whole module, thereby reducing the light loss, obviously improving the brightness of the prism adhesive film, simplifying the preparation process and the assembly process and saving the cost.)

1. A prism adhesive film with high brightness is characterized in that: the novel PET coating film sequentially comprises a back coating layer (1), a PET layer (2), a first prism layer (3) and a second prism layer (4) from bottom to top, prisms are arranged on the first prism layer (3) and the second prism layer (4) in an array mode, the vertex angles of the prisms of the first prism layer (3) are inserted into the lower surface of the second prism layer (4), the longitudinal extending direction of the prisms of the first prism layer (3) and the longitudinal extending direction of the prisms of the second prism layer (4) form a 90-degree included angle, the height of the prisms of the first prism layer (3) is 20-44 mu m, the height difference of the vertexes of the prisms of the first prism layer (3) is 0.5-2 mu m, the height of the prisms of the second prism layer (4) is 20-44 mu m, the prisms of the second prism layer (4) are arranged at the same height, and the haze of the back coating layer (1) is 2-10%.

2. A high brightness prism laminate film according to claim 1, wherein: the structure spacing of each prism of the first prism layer (3) is 60-100 mu m, and the structure spacing of each prism of the second prism layer (4) is 20-50 mu m.

3. A high brightness prism laminate film according to claim 1, wherein: the surface of the first prism layer (3) is wavy, the included angle between the prism extension direction of the first prism layer (3) and the rolling direction of the PET layer (2) is 45-50 degrees, and the included angle between the prism extension direction of the second prism layer (4) and the rolling direction of the PET layer (2) is 135-140 degrees.

4. A high brightness prism laminate film according to claim 3, wherein: the width of each prism of the first prism layer (3) is 20-100 mu m, and the prism apex angles of the first prism layer (3) and the second prism layer (4) are both 80-100 degrees.

5. A high brightness prism laminate film according to claim 4, wherein: the first prism layer (3) and the second prism layer (4) have prism apex angles of 90 degrees.

6. The method of manufacturing a prism attachment film with high brightness according to any one of claims 1 to 5, wherein: the preparation method comprises the following steps:

q1: taking PET, and carrying out surface corona treatment by a corona device, wherein the corona voltage is 0.1-0.5 KV, so as to prepare a PET layer (2);

q2: preparing mixed resin A from acrylic resin, PBMA particles and ethyl acetate according to the weight part ratio of 1:0.1: 1-1: 0.3:1.2, coating the mixed resin A on the lower surface of the PET layer (2), and drying at 70-100 ℃ for 2-4 min to obtain a back coating (1);

q3: mixing polyurethane acrylate resin A and an initiator A, coating the mixture on the PET layer (2), and preparing a first prism layer (3) by a UV impression or high-precision carving machine carving molding mode, wherein UV energy is controlled to be 50-100 mj/cm²The conversion rate of double bonds is controlled to be 40-60%;

q4: taking a paraffin solution, coating the surface of the first prism layer (3) by adopting an extrusion and tape casting mode, drying at 80-100 ℃, completely removing a solvent in the paraffin solution, cooling to 25 ℃, and enabling the height of the solidified paraffin solution to be equal to the vertex angle of the first prism layer (3) in height;

q5: mixing polyurethane acrylate resin B and an initiator B, coating the mixture on the surface of the solidified paraffin solution, and preparing a second prism layer (4) by means of UV impression or carving and molding by a high-precision carving machine, wherein UV energy is controlled to be 50-100 mj/cm²And controlling the double bond conversion rate to be 40-60%, then placing the film in an environment at 60 ℃ for baking to ensure that the paraffin solution between the first prism layer (3) and the second prism layer (4) is completely liquefied, applying 0.05-0.1 MPa of airflow, and completely discharging the liquefied paraffin solution along the extending direction of the prisms of the first prism layer to finally prepare the high-brightness prism adhesive film.

7. The method of claim 6, wherein the step of preparing the prism sheet comprises: the paraffin solution contains 20-22 carbon atoms in molecules, the solid content is 85-90%, and the solvent in the paraffin solution is petroleum ether or toluene.

8. The method of claim 6, wherein the step of preparing the prism sheet comprises: the double bond density range of the polyurethane acrylate resin A is 2-3 mmol/g, and the weight portion ratio of the polyurethane acrylate resin A to the initiator A is 98.5: 1.5-98: 2.

9. The method of claim 6, wherein the step of preparing the prism sheet comprises: the double bond density range of the polyurethane acrylate resin B is 3-4 mmol/g, and the weight portion ratio of the polyurethane acrylate resin B to the initiator B is 97: 3-96: 4.

Technical Field

The invention relates to an optical film, in particular to a high-brightness prism adhesive film and a preparation method thereof.

Background

The structure of current prism laminating membrane is generally followed up to be first PET layer, first prism layer, second PET layer, second prism layer from down, and first prism layer passes through the adhesive with first PET layer and pastes together, but because PET's luminousness only about 90%, so double-deck PET stacked structure will lead to the transmissivity of light lower, and then leads to the luminance loss of whole optical module great.

Disclosure of Invention

The invention provides a novel high-brightness prism adhesive film and a preparation method thereof, aiming at the defects that the light transmittance of a double-layer PET superposed structure of the prism adhesive film is low, the brightness loss of the whole optical module is large and the like in the prior art.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the high-brightness prism laminating film sequentially comprises a back coating, a PET (polyethylene terephthalate) layer, a first prism layer and a second prism layer from bottom to top, wherein prisms are arranged on the first prism layer and the second prism layer in an array mode, the vertex angle of each prism of the first prism layer is inserted into the lower surface of the second prism layer, the longitudinal extending direction of each prism of the first prism layer and the longitudinal extending direction of each prism of the second prism layer form an included angle of 90 degrees, the height of each prism of the first prism layer is 20-44 mu m, the height difference of each prism vertex of the first prism layer is 0.5-2 mu m, the height of each prism of the second prism layer is 20-44 mu m, the heights of each prism of the second prism layer are equal, and the haze of the back coating is 2-10%.

The back coating layer, the PET layer, the first prism layer and the second prism layer are adopted, the prism vertex angle of the first prism layer is directly contacted with the lower surface of the second prism layer, and the double-layer PET layer structure in the prior art is simplified, so that the light loss is reduced, the light transmittance of the whole module is improved, the preparation process and the assembly process are simplified, and the cost is saved. The prism longitudinal extension direction of the first prism layer and the prism longitudinal extension direction of the second prism layer form an included angle of 90 degrees, so that the phenomenon of light interference in the whole module is reduced, and the luminance of the prism adhesive film is obviously improved.

Preferably, in the prism adhesive film with high brightness, the structure pitch of each prism of the first prism layer is 60 to 100 μm, and the structure pitch of each prism of the second prism layer is 20 to 50 μm.

The prism structure space of the first prism layer is relatively larger than that of the second prism layer, so that a larger gap can be reserved on the surface of the first prism layer, and a sufficient space is reserved for the subsequent process. The prism structure interval of the second prism layer is smaller, and the overall brightness and uniformity of the prism adhesive film can be improved.

Preferably, in the high-brightness prism adhesive film, the surface of the first prism layer is wavy, an included angle between the prism extension direction of the first prism layer and the winding direction of the PET layer is 45 to 50 degrees, and an included angle between the prism extension direction of the second prism layer and the winding direction of the PET layer is 135 to 140 degrees.

The first prism layer with the wavy surface can improve the brightness of the whole prism adhesive film. The prism with the included angle structure can reduce the interference phenomenon in the prism attaching film and reduce the generation of Moire.

Preferably, in the high-brightness prism adhesive film, the width of each prism of the first prism layer is 20 to 100 μm, and the vertex angle of each prism of the first prism layer and the second prism layer is 80 to 100 °.

The prism adopting the parameters can ensure that the whole prism laminated film obtains better luminance effect.

Preferably, in the prism sheet having high brightness, the first prism layer and the second prism layer have a prism apex angle of 90 °.

The prism with 90-degree vertex angle can ensure that the whole prism laminated film obtains the best luminance effect.

Preferably, the method for manufacturing a prism sheet having high brightness includes the following steps:

q1: taking PET, and carrying out surface corona treatment by a corona device, wherein the corona voltage is 0.1-0.5 KV, so as to prepare a PET layer;

q2: preparing mixed resin A from acrylic resin, PBMA particles and ethyl acetate according to the weight part ratio of 1:0.1: 1-1: 0.3:1.2, coating the mixed resin A on the lower surface of the PET layer, and drying at the temperature of 70-100 ℃ for 2-4 min to obtain a back coating;

q3: mixing polyurethane acrylate resin A and an initiator A, coating the mixture on the PET layer, and preparing a first prism layer by means of UV impression or carving and molding by a high-precision carving machine, wherein UV energy is controlled to be 50-100 mj/cm²The conversion rate of double bonds is controlled to be 40-60%;

q4: taking a paraffin solution, coating the surface of the first prism layer by adopting an extrusion and tape casting mode, drying at 80-100 ℃, completely removing a solvent in the paraffin solution, cooling to 25 ℃, and enabling the height of the solidified paraffin solution to be equal to the vertex angle of the first prism layer in height;

q5: mixing polyurethane acrylate resin B and initiator B, coating the mixture on the surface of the solidified paraffin solution, and preparing a second prism layer by means of UV impression or carving and molding by a high-precision carving machine, wherein UV energy is controlled to be 50-100 mj/cm²And controlling the conversion rate of the double bonds to be 40-60%, then placing the film in an environment at 60 ℃ for baking to completely liquefy the paraffin solution between the first prism layer and the second prism layer, applying 0.05-0.1 MPa of airflow, and completely discharging the liquefied paraffin solution along the extending direction of the prisms of the first prism layer to finally obtain the high-brightness prism adhesive film.

In the Q1 step, the surface tension of PET is increased by performing corona treatment on the surface of the PET, so that the adhesion of the PET and a subsequent coating is further increased.

In the step Q2, acrylic resin, PBMA particles and ethyl acetate are selected as raw materials of the back coating, so that the prepared back coating has the best transmittance and haze and has excellent anti-sticking property and scratch resistance.

In the Q3 step, adopt UV impression or high-accuracy engraver sculpture fashioned mode to prepare first prism layer, be favorable to first prism layer and PET layer to obtain best adhesion effect, have the advantage that shaping efficiency is high, the solidification is effectual, process cycle is short, reduce the energy consumption simultaneously.

In the Q4 step, adopt paraffin solution to fill the prism space on first prism layer to obtain smooth level surface, be favorable to follow-up laminating second prism layer.

In the Q5 step, make the second prism layer through UV impression or high-accuracy engraver sculpture fashioned mode earlier, get rid of the complete liquefaction of paraffin solution in the first prism layer space again to obtain complete prism laminating membrane structure, be favorable to prism laminating membrane to obtain the best light penetrability, reduced the substrate layer in the middle of having reduced in the preparation process simultaneously, and paraffin solution cyclic utilization, a large amount of reduce cost.

Preferably, in the preparation method of the high-brightness prism adhesive film, the paraffin solution contains 20-22 carbon atoms in molecules, the solid content is 85-90%, and the solvent in the paraffin solution is petroleum ether or toluene.

And (3) selecting a paraffin solution containing 20-22 carbon atoms and having a solid content of 85-90% to prepare the substrate, so that the second prism layer can be coated conveniently, and meanwhile, the paraffin solution can be liquefied at high temperature and completely removed, so that a complete prism laminating film structure is obtained.

Preferably, in the method for preparing the prism adhesive film with high brightness, the double bond density of the urethane acrylate resin A is 2-3 mmol/g, and the weight ratio of the urethane acrylate resin A to the initiator A is 98.5: 1.5-98: 2.

The first prism layer is prepared from the polyurethane acrylate resin A and the initiator A, so that UV curing can be accelerated, energy consumption is reduced, and cost is greatly reduced.

Preferably, in the method for preparing the prism adhesive film with high brightness, the double bond density of the urethane acrylate resin B is 3 to 4mmol/g, and the weight ratio of the urethane acrylate resin B to the initiator B is 97:3 to 96: 4.

The second prism layer is prepared by adopting the polyurethane acrylate resin B and the initiator B, so that the UV curing can be accelerated, the energy consumption is reduced, and the cost is greatly reduced.

Taking the prism adhesive film finally prepared by the invention, measuring according to a GB/T33049-2016 method, taking a louvre knife and a 3M610 adhesive tape, preparing the prism adhesive film into an A4 size, and scribing in the directions of 0 degree and 90 degrees of the prism adhesive film by using the louvre knife to form a grid pattern; the 3M610 adhesive tape is placed above the grid pattern, the adhesive tape is quickly torn off after the 3M610 adhesive tape is flattened by hands, and the edge of the cut of the grid pattern is found to be smooth and has no peeling, which shows that 100% of the PET layer and the first prism layer of the prism adhesive film finally prepared by the invention are attached and have no peeling, namely the adhesive force between the PET layer and the first prism layer is 0 grade, and the higher the adhesive force between the first prism layer and the PET layer is, the better the service life of the prism adhesive film is.

Drawings

FIG. 1 is a first schematic structural diagram of the present invention;

FIG. 2 is a second schematic structural view of the present invention;

fig. 3 is a top view of the present invention.

Detailed Description

The invention will be described in further detail below with reference to the accompanying figures 1-3 and the detailed description, but they are not intended to limit the invention:

example 1

The high-brightness prism laminating film sequentially comprises a back coating layer 1, a PET layer 2, a first prism layer 3 and a second prism layer 4 from bottom to top, prisms are arranged on the first prism layer 3 and the second prism layer 4 in an array mode, vertex angles of the prisms of the first prism layer 3 are inserted into the lower surface of the second prism layer 4, the longitudinal extending direction of the prisms of the first prism layer 3 and the longitudinal extending direction of the prisms of the second prism layer 4 form an included angle of 90 degrees, the height of the prisms of the first prism layer 3 is 20 micrometers, the height difference of vertexes of the prisms of the first prism layer 3 is 0.5 micrometers, the height of the prisms of the second prism layer 4 is 20 micrometers, the prisms of the second prism layer 4 are arranged at the same height, and the haze of the back coating layer 1 is 2%.

Preferably, the structure pitch of each prism of the first prism layer 3 is 60 μm, and the structure pitch of each prism of the second prism layer 4 is 20 μm.

Preferably, the surface of the first prism layer 3 is wavy, the included angle between the prism extending direction of the first prism layer 3 and the rolling direction of the PET layer 2 is 45 degrees, and the included angle between the prism extending direction of the second prism layer 4 and the rolling direction of the PET layer 2 is 135 degrees.

Preferably, the width of each prism of the first prism layer 3 is 20 μm, and the prism apex angles of the first prism layer 3 and the second prism layer 4 are both 80 °.

Preferably, the preparation steps are as follows:

q1: taking PET, carrying out surface corona treatment by a corona device, wherein the corona voltage is 0.1KV, and preparing a PET layer 2;

q2: preparing mixed resin A from acrylic resin, PBMA particles and ethyl acetate according to the weight part ratio of 1:0.1:1, coating the mixed resin A on the lower surface of the PET layer 2, and drying at 70 ℃ for 2min to obtain a back coating 1;

q3: mixing polyurethane acrylate resin A and an initiator A, coating the mixture on the PET layer 2, and preparing a first prism layer 3 by UV impression or carving and molding by a high-precision carving machine, wherein UV energy is controlled at 50mj/cm²The conversion rate of double bonds is controlled at 40 percent;

q4: taking a paraffin solution, coating the paraffin solution on the surface of the first prism layer 3 in an extrusion and casting manner, drying at 80 ℃, completely removing a solvent in the paraffin solution, cooling to 25 ℃, and enabling the height of the solidified paraffin solution to be equal to the vertex angle of the first prism layer 3;

q5: mixing polyurethane acrylate resin B and initiator B, coating the mixture on the surface of the solidified paraffin solution, and preparing a second prism layer 4 by means of UV impression or carving and molding by a high-precision carving machine, wherein the UV energy is controlled at 50mj/cm²The conversion rate of double bonds is controlled at 40%, and then the mixture is baked in an environment at 60 ℃ to be positioned at the second placeAnd completely liquefying the paraffin solution between the prism layer 3 and the second prism layer 4, applying 0.05MPa of airflow, and completely discharging the liquefied paraffin solution along the extending direction of the prisms of the first prism layer to finally obtain the high-brightness prism adhesive film.

Preferably, the paraffin wax solution contains 20 carbon atoms in the molecule and has a solid content of 85%, and the solvent in the paraffin wax solution is petroleum ether or toluene.

Preferably, the double bond density of the polyurethane acrylate resin A is in the range of 2mmol/g, and the weight part ratio of the polyurethane acrylate resin A to the initiator A is 98.5: 1.5.

Preferably, the double bond density of the urethane acrylate resin B is in the range of 3mmol/g, and the weight part ratio of the urethane acrylate resin B to the initiator B is 97: 3.

Example 2

The high-brightness prism laminating film sequentially comprises a back coating layer 1, a PET layer 2, a first prism layer 3 and a second prism layer 4 from bottom to top, prisms are arranged on the first prism layer 3 and the second prism layer 4 in an array mode, vertex angles of the prisms of the first prism layer 3 are inserted into the lower surface of the second prism layer 4, the longitudinal extending direction of the prisms of the first prism layer 3 and the longitudinal extending direction of the prisms of the second prism layer 4 form an included angle of 90 degrees, the height of the prisms of the first prism layer 3 is 44 micrometers, the height difference of vertexes of the prisms of the first prism layer 3 is 2 micrometers, the height of the prisms of the second prism layer 4 is 44 micrometers, the prisms of the second prism layer 4 are arranged in a high mode, and the haze of the back coating layer 1 is 10%.

Preferably, the structure pitch of each prism of the first prism layer 3 is 100 μm, and the structure pitch of each prism of the second prism layer 4 is 50 μm.

Preferably, the surface of the first prism layer 3 is wavy, the included angle between the prism extension direction of the first prism layer 3 and the rolling direction of the PET layer 2 is 50 degrees, and the included angle between the prism extension direction of the second prism layer 4 and the rolling direction of the PET layer 2 is 140 degrees.

Preferably, the width of each prism of the first prism layer 3 is 100 μm, and the prism apex angles of the first prism layer 3 and the second prism layer 4 are both 100 °.

Preferably, the preparation steps are as follows:

q1: taking PET, carrying out surface corona treatment by a corona device, wherein the corona voltage is 0.5KV, and preparing a PET layer 2;

q2: preparing mixed resin A from acrylic resin, PBMA particles and ethyl acetate according to the weight part ratio of 1:0.3:1.2, coating the mixed resin A on the lower surface of the PET layer 2, and drying at 100 ℃ for 4min to obtain a back coating 1;

q3: mixing polyurethane acrylate resin A and an initiator A, coating the mixture on the PET layer 2, and preparing a first prism layer 3 in a UV impression or high-precision carving machine carving molding mode, wherein UV energy is controlled at 100mj/cm²The double bond conversion rate is controlled at 60 percent;

q4: taking a paraffin solution, coating the paraffin solution on the surface of the first prism layer 3 in an extrusion and casting manner, drying at 100 ℃, completely removing a solvent in the paraffin solution, cooling to 25 ℃, and enabling the height of the solidified paraffin solution to be equal to the vertex angle of the first prism layer 3;

q5: mixing polyurethane acrylate resin B and initiator B, coating the mixture on the surface of the solidified paraffin solution, and preparing a second prism layer 4 by means of UV impression or carving and molding by a high-precision carving machine, wherein the UV energy is controlled at 100mj/cm²And controlling the double bond conversion rate to be 60%, then placing the film in an environment at 60 ℃ for baking to completely liquefy the paraffin solution between the first prism layer 3 and the second prism layer 4, applying 0.1MPa of airflow, and completely discharging the liquefied paraffin solution along the extending direction of the prisms of the first prism layer to finally prepare the high-brightness prism adhesive film.

Preferably, the paraffin wax solution contains 22 carbon atoms in the molecule and has a solid content of 90%, and the solvent in the paraffin wax solution is petroleum ether or toluene.

Preferably, the double bond density of the polyurethane acrylate resin A is in the range of 3mmol/g, and the weight part ratio of the polyurethane acrylate resin A to the initiator A is 98: 2.

Preferably, the double bond density of the polyurethane acrylate resin B is in the range of 4mmol/g, and the weight part ratio of the polyurethane acrylate resin B to the initiator B is 96: 4.

Example 3

The high-brightness prism laminating film sequentially comprises a back coating layer 1, a PET layer 2, a first prism layer 3 and a second prism layer 4 from bottom to top, prisms are arranged on the first prism layer 3 and the second prism layer 4 in an array mode, vertex angles of the prisms of the first prism layer 3 are inserted into the lower surface of the second prism layer 4, the longitudinal extending direction of the prisms of the first prism layer 3 and the longitudinal extending direction of the prisms of the second prism layer 4 form an included angle of 90 degrees, the height of the prisms of the first prism layer 3 is 32 micrometers, the height difference of vertexes of the prisms of the first prism layer 3 is 1.3 micrometers, the height of the prisms of the second prism layer 4 is 32 micrometers, the prisms of the second prism layer 4 are arranged at the same height, and the haze of the back coating layer 1 is 6%.

Preferably, the structure pitch of the prisms of the first prism layer 3 is 80 μm, and the structure pitch of the prisms of the second prism layer 4 is 35 μm.

Preferably, the surface of the first prism layer 3 is wavy, the included angle between the prism extension direction of the first prism layer 3 and the rolling direction of the PET layer 2 is 47 degrees, and the included angle between the prism extension direction of the second prism layer 4 and the rolling direction of the PET layer 2 is 138 degrees.

Preferably, the width of each prism of the first prism layer 3 is 60 μm, and the prism apex angles of the first prism layer 3 and the second prism layer 4 are both 90 °.

Preferably, the preparation steps are as follows:

q1: taking PET, carrying out surface corona treatment by a corona device, wherein the corona voltage is 0.3KV, and preparing a PET layer 2;

q2: preparing mixed resin A from acrylic resin, PBMA particles and ethyl acetate according to the weight part ratio of 1:0.2:1.1, coating the mixed resin A on the lower surface of the PET layer 2, and drying at 85 ℃ for 3min to obtain a back coating 1;

q3: mixing polyurethane acrylate resin A and an initiator A, coating the mixture on the PET layer 2, and preparing a first prism layer 3 by UV impression or carving and molding by a high-precision carving machine, wherein UV energy is controlled at 75mj/cm²The double bond conversion rate is controlled at 50 percent;

q4: taking a paraffin solution, coating the paraffin solution on the surface of the first prism layer 3 in an extrusion and casting manner, drying at 90 ℃, completely removing a solvent in the paraffin solution, cooling to 25 ℃, and enabling the height of the solidified paraffin solution to be equal to the vertex angle of the first prism layer 3;

q5: mixing polyurethane acrylate resin B and initiator B, coating the mixture on the surface of the solidified paraffin solution, and preparing a second prism layer 4 by means of UV impression or carving and molding by a high-precision carving machine, wherein the UV energy is controlled at 75mj/cm²And controlling the double bond conversion rate to be 50%, then placing the film in an environment at 60 ℃ for baking to completely liquefy the paraffin solution between the first prism layer 3 and the second prism layer 4, applying 0.08MPa of airflow to completely discharge the liquefied paraffin solution along the extending direction of the prisms of the first prism layer, and finally obtaining the high-brightness prism adhesive film.

Preferably, the paraffin wax solution contains 21 carbon atoms in the molecule, the solid content is 88%, and the solvent in the paraffin wax solution is petroleum ether or toluene.

Preferably, the double bond density of the polyurethane acrylate resin A is in the range of 2.5mmol/g, and the weight part ratio of the polyurethane acrylate resin A to the initiator A is 98.2: 1.8.

Preferably, the double bond density of the polyurethane acrylate resin B is in the range of 3.5mmol/g, and the weight ratio of the polyurethane acrylate resin B to the initiator B is 96.5: 3.5.

Example 4

Taking the prism adhesive film obtained in each embodiment, taking the existing common POP type prism adhesive film as a comparative example, and testing the thickness, the brightness, the light transmittance and the adhesive force performance, wherein the testing method comprises the following steps:

firstly, luminance testing: each example and comparative example was sampled using a BM-7A luminance tester to be a4 size, and the luminance of the four corners and the center point of each example and comparative example was measured and compared.

Secondly, testing the light transmittance: samples of each example and comparative example were taken and made into a4 size, and each sample was sequentially placed in a transmittance/haze measuring instrument, and transmittance measurements were performed and data were recorded, respectively, under ISO standards.

Thirdly, testing the peeling force: taking samples of each embodiment and comparative example, preparing sample strips of 25mm multiplied by 150mm, clamping two ends of the sample on clamps of a tension meter respectively by using a computer type tension meter, clicking to start testing, stretching the two clamps in opposite directions, measuring a tension value, and recording data of the tension value.

The prism films and comparative examples obtained in the examples of the present invention had performance parameters as shown in table 1:

TABLE 1

Sample (I)	Luminance of a light	Light transmittance	Peeling force
				Example 1	120％	3.63％	75N
Example 2	115％	3.80％	75N
				Example 3	118％	3.50％	74N
Comparative example	100％	3.28％	80N

In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.