A method for producing a one-way vision film

Abstract

The present application relates to a kind of preparation method of one-way see-through film, the present application is provided with colored grating close to the arrangement of light-transmitting metal film in the anti-peeping layer, the person of observation area has good vision to see the situation of observed area, and the person of observed area is not seen observation area situation, reaches one-way see-through, prevents the effect of peeping;The inclined plane colored grating of anti-peeping layer can absorb and eliminate the reflection of observation surface, also can block the parallel light and scattered light of observed area into observation area, reduce the influence of glare, when the intensity difference of light on both sides is small, due to the guiding and absorption effect of inclined plane colored grating, also can play good one-way see-through effect;The reflection effect of light-transmitting metal film layer and the shading effect of anti-peeping layer influence each other, can eliminate ghosting and mirror effect, greatly strengthen the one-way see-through and anti-peeping effect of one-way see-through film.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of functional glass film technology, in particular to a preparation method of a one-way perspective film suitable for a glass surface of a concealed observation window, which has the effects of one-way perspective and preventing peeping. BACKGROUND

[0002] In some specific places, it is often necessary to separate the space into two intervals with a concealed observation window, which needs to have the effect of one-way perspective. The concealed observation window can be divided by special film or film-coated glass, so that the observation area can one-way perspective the observed area to maintain the privacy of people or objects in the observation area.

[0003] A Chinese patent with the publication number CN207749063U, "One-way perspective film and automobile windshield glass based thereon" (application number: CN201721122566.7), discloses a structure, which one-way perspective film includes a transparent substrate, a convex lens layer located on the upper side of the transparent substrate, and a reflective ink layer located on the lower side of the transparent substrate, the convex lens layer is composed of a microlens column, and the reflective ink layer is distributed with at least two through holes and has a pattern printed therein. Taking the case of pasting the perspective film on the vehicle window, the above-mentioned one-way perspective film can reflect most of the light outside the vehicle, and at the same time, the convex lens can maximize the light gathering effect to ensure better observation effect of the passengers and the driver inside the vehicle.

[0004] However, due to the limitation of its one-way perspective structure, the above-mentioned one-way perspective film is prone to ghosting or mirror effect, which affects its one-way perspective degree; and the parallel light and scattered light in the observed area entering the observation area can easily cause glare problem, further affecting the one-way perspective effect.

[0005] Therefore, the preparation method of the current one-way perspective film needs to be further improved. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a preparation method of a one-way perspective film which can eliminate ghosting and mirror effect, reduce glare influence and improve one-way perspective effect.

[0007] The technical solution adopted by the present application to solve the above technical problem is:

[0008] A preparation method of a one-way perspective film, the one-way perspective film includes abrasion-resistant layer, substrate B, anti-peeping layer, substrate A, mounting glue and release film which are compounded in sequence.

[0009] The preparation method of the one-way perspective film includes the following steps:

[0010] (1) Apply colored UV resin on the upper surface of the substrate A, form beveled colored grating by embossing, and shape after photocuring;

[0011] (2) Apply a layer of transparent composite glue on the surface of the cured beveled colored grating, the transparent composite glue surrounds the colored grating, and the two together constitute the anti-peep layer;

[0012] (3) Compound transparent polyester film on the upper surface of the transparent composite glue to form the substrate B;

[0013] (4) Apply mounting glue on the lower surface of the substrate A and compound release film;

[0014] (5) Apply hardening glue on the upper surface of the substrate B, and form wear-resistant layer after UV photocuring.

[0015] Preferably, the substrate A is an aluminum-plated metal film or a magnetron sputtering metal film with visible light reflectance greater than 50%, the lower end of the colored grating is arranged close to the metal layer on the upper surface of the substrate A, and the height of the colored grating is lower than that of the transparent composite glue layer so that the upper end is located within the transparent composite glue layer. The colored grating with specific structure is arranged on the surface of the substrate A and close to the metal film layer, which, in combination with the light shielding and absorbing effects of the colored grating, eliminates ghosting or mirror effect and reduces glare, thereby improving the one-way perspective effect.

[0016] The preparation materials of the colored UV resin include the following components by weight:

[0017] Modified aliphatic polyurethane acrylate, 15-80 parts;

[0018] Adhesion promoter, 0.1-20 parts;

[0019] Photoinitiator, 0.1-10 parts;

[0020] Leveling agent, 0.01-1 part;

[0021] Dilution solvent, 10-50 parts;

[0022] Colored dye, 0.01-1 part

[0023] The modified aliphatic polyurethane acrylate is CB-5 from Guangzhou Haoyi Chemical Technology Co., Ltd.; the adhesion promoter is a titanate from Xuanhao New Material Co., Ltd., with a brand AA75; the photoinitiator is photoinitiator 184 from Yingli Science and Technology Development Co., Ltd.; the leveling agent is BYK533 from Germany BYK Chemical; the diluent solvent is ethyl acetate, or a mixture of ethyl acetate and toluene, or a mixture of ethyl acetate and butanone, with a mass ratio of 1:1; and the colored dye is a commercially available solvent-based dye, which can be solvent black, solvent blue, solvent green, etc.

[0024] Preferably, the preparation method of the colored UV resin is as follows:

[0025] The photoinitiator is mixed with the diluent solvent and stirred uniformly, then the modified aliphatic polyurethane acrylate is added and stirred, the adhesion promoter and the leveling agent are added and stirred; the viscosity is measured with a rotary viscometer, and the viscosity is adjusted to 500-1000 centipoise with the diluent solvent, then the solvent-based dye is added to the mixture and stirred uniformly, to obtain the colored UV resin with uniform dispersion.

[0026] Preferably, the acute angle θ between the colored grating and the substrate A is 25°-65°, and the effect is best when the angle is 45°; under the premise that the colored grating can block parallel light, the grating spacing distance is required to be ≤ When the angle between the colored grating and the substrate A is less than 25°, the visual angle of the observation area becomes smaller and the effect becomes worse; when the angle is greater than 65°, to achieve the effect of blocking parallel light, according to the relationship between the grating spacing distance and the vertical height of the grating, the processing difficulty increases, which is not conducive to application. Therefore, the above structure can enhance the effect and economy of one-way perspective.

[0027] Preferably, the cross section of the colored grating is a parallelogram, and the bottom edge of the parallelogram is arranged close to the upper surface of the substrate A, and the thickness of the parallelogram in the transverse direction is 2-6 μm. Preferably, the distance between the two adjacent colored gratings is 2-6 μm. Preferably, the thickness of the composite adhesive layer is 6-15 μm. The above structure can further enhance the effect of one-way perspective.

[0028] Preferably, the transparent composite adhesive and the mounting adhesive are both solvent-based acrylate glue, the wear-resistant layer uses a hardening glue which is a ultraviolet light curing hardening liquid, and the release film is a transparent film for protecting the mounting adhesive.

[0029] Compared with the prior art, the one-way perspective film has the advantages that: the colored grating arranged close to the light-transmitting metal film in the anti-peeping layer enables the person in the observation area to have a good view of the observed area, while the person in the observed area cannot see the observation area, thereby achieving the effect of one-way perspective and preventing peeping; the inclined colored grating of the anti-peeping layer can absorb and eliminate the reflection of the observation surface, and can also block the parallel light and scattered light from the observed area into the observation area, thereby reducing the influence of glare; when the difference between the light intensities on the two sides is small, the inclined colored grating can also achieve a good one-way perspective effect due to the guiding and absorbing effects; and the reflection of the light-transmitting metal film layer and the shading of the anti-peeping layer affect each other, thereby eliminating ghosting and mirror effects in the observation area, and greatly enhancing the one-way perspective and anti-peeping effects of the one-way perspective film. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 A structure diagram of the one-way perspective film in the embodiment of the present application is shown in the figure.

[0031] Figure 2 A cooperation diagram of the substrate A and the anti-peeping layer in the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0032] The present application will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0033] As shown in the figures, Figure 1 , 2 the one-way perspective film of the present application comprises, in sequence, a wear-resistant layer 1, a substrate B 2, an anti-peeping layer 3, a substrate A 4, mounting glue 5, and a release film 6.

[0034] The substrate A 4 is an aluminized metal film or a magnetron sputtering metal film with a visible light reflectance greater than 50%. The anti-peeping layer 3 is internally provided with a plurality of inclined and spaced colored gratings 31, and each colored grating 31 collectively constitutes a one-way perspective anti-peeping structure. The anti-peeping layer 3 comprises a transparent composite glue layer 32 and the colored gratings 31, the lower end of the colored gratings 31 is arranged close to the junction of the anti-peeping layer 3 and the substrate A 4, and the colored gratings 31 are lower than the height of the transparent composite glue layer 32 so that the upper end thereof is located within the transparent composite glue layer 32. The colored gratings 31 with a specific structure are arranged on the surface of the substrate A 4 and close to the metal film layer, and under the reflection of the metal film layer, the colored gratings 31 are combined with the light-shielding and absorbing effects to eliminate ghosting or mirror effects and reduce glare, thereby improving the one-way perspective effect.

[0035] The acute angle θ between the colored gratings 31 and the substrate A 4 is 25°-65°, which facilitates the realization of the one-way perspective effect. The effect is best when the colored gratings 31 and the substrate A 4 form an angle of 45°. The above structure is adopted to enhance the one-way perspective effect.

[0036] The cross section of the colored grating 31 is a parallelogram, and the bottom edge of the parallelogram is arranged close to the upper surface of the base material A 4, and the thickness of the parallelogram 4 in the transverse direction is 2 μm ~ 6 μm. The distance between the adjacent two colored gratings 31 is 2 μm ~ 6 μm, and the thickness of the composite adhesive layer is 6 μm ~ 15 μm.

[0037] Preparation of colored UV resin:

[0038] The required raw material components, by weight, include the following components:

[0039] Modified aliphatic polyurethane acrylate, 65 parts;

[0040] Adhesion promoter, 10 parts;

[0041] Photoinitiator, 5 parts;

[0042] Leveling agent, 0.5 parts;

[0043] Diluent solvent, 19.3 parts;

[0044] Colored dye, 0.2 parts

[0045] Among them, the modified aliphatic polyurethane acrylate is from Guangzhou Haoyi Chemical Technology Co., Ltd., and the brand is CB-5; the adhesion promoter is from Tianxiang New Material Co., Ltd. The titanate is AA75; the photoinitiator is the photoinitiator 184 of Yingli Technology Development Co., Ltd.; the leveling agent is BYK533 of Germany Bick Chemical Co., Ltd.; the diluent solvent is ethyl acetate solvent, or a mixture of ethyl acetate and toluene, or a mixture of ethyl acetate and butanone, and the mixture is mixed in a mass ratio of 1:1; the colored dye is a commercially available solvent type dye, which uses Clariant solvent black-27.

[0046] The preparation method of the colored UV resin is:

[0047] Mix the photoinitiator with the diluent solvent and stir uniformly, then add the modified aliphatic polyurethane acrylate and stir, add the adhesion promoter and leveling agent and stir; measure the viscosity with a rotary viscometer, adjust the viscosity with a diluent solvent, adjust the viscosity to 500 ~ 1000 centipoise, add solvent black-27 dye to the mixture, and stir uniformly to obtain a uniformly dispersed colored UV resin. Example

[0048] The preparation method of the one-way perspective film of the present embodiment is:

[0049] (1) Color UV resin is coated on the upper surface of substrate A 4 (aluminum-coated film with a visible light reflectance of 65%), with a coating thickness controlled at 10 μm, to form a beveled color grating 31 by means of embossing, and the beveled color grating is shaped after photocuring; the included angle between the obtained color grating 31 and substrate A 4 is 45°, the thickness of the beveled color grating is 5 μm, the interval between two adjacent color gratings is 5 μm, and the vertical height of the beveled color grating is 5 μm;

[0050] (2) A layer of transparent composite glue 32 is coated on the surface of the cured beveled color grating 31, the transparent composite glue surrounds the beveled color grating 31, and the two together constitute the anti-peeping layer 3; the thickness of the composite glue layer is 8 μm;

[0051] (3) A transparent polyester film is compounded on the upper surface of the transparent composite glue 32 to form substrate B 2, and the substrate B 2 is heated and dried;

[0052] (4) Acrylate pressure-sensitive adhesive is coated on the lower surface of substrate A 4, and mounting glue 5 is obtained after drying; a release film 6 is compounded on the mounting glue;

[0053] (5) Hardening glue is coated on the upper surface of substrate B 2, and wear-resistant layer 1 is formed after UV photocuring. Example

[0054] The preparation method of the one-way perspective film of the present embodiment is as follows:

[0055] (1) Color UV resin is coated on the upper surface of substrate A 4 (magnetron sputtering film with a visible light reflectance of 55%), with a coating thickness controlled at 10 μm, to form a beveled color grating 31 by means of embossing, and the beveled color grating is shaped after photocuring; the included angle between the obtained color grating 31 and substrate A 4 is 60°, the thickness of the beveled color grating is 5 μm, the interval between two adjacent color gratings is 4 μm, and the vertical height of the beveled color grating is about 7 μm;

[0056] (2) A layer of transparent composite glue 32 is coated on the surface of the cured beveled color grating 31, the transparent composite glue surrounds the beveled color grating 31, and the two together constitute the anti-peeping layer 3; the thickness of the composite glue layer is 10 μm;

[0057] (3) A transparent polyester film is compounded on the upper surface of the transparent composite glue 32 to form substrate B 2, and the substrate B 2 is heated and dried;

[0058] (4) Acrylate pressure-sensitive adhesive is coated on the lower surface of substrate A 4, and mounting glue 5 is obtained after drying; a release film 6 is compounded on the mounting glue;

[0059] (5) Hardening glue is coated on the upper surface of substrate B 2, and wear-resistant layer 1 is formed after UV photocuring.

[0060] Comparative Example A

[0061] The preparation method of the one-way perspective film of the present comparative example is as follows:

[0062] A colored UV resin is coated on the upper surface of the substrate A 4 (aluminum-coated film with a visible light reflectance of 20%), the coating thickness is controlled at 10 μm, a slanted colored grating 31 is formed by embossing, and is shaped after photocuring; the included angle between the obtained colored grating 31 and the substrate A 4 is 45°, the thickness of the slanted colored grating is 5 μm, the interval between two adjacent colored gratings is 5 μm, and the vertical height of the slanted colored grating is 5 μm;

[0063] (2) A layer of transparent composite glue 32 is coated on the surface of the cured slanted colored grating 31, the transparent composite glue surrounds the slanted colored grating 31, and the two together constitute the anti-peeping layer 3, the thickness of the composite glue layer is 8 μm;

[0064] (3) A transparent polyester film is compounded on the upper surface of the transparent composite glue 32 to form the substrate B 2, and is heated and dried;

[0065] (4) Acrylate pressure-sensitive glue is coated on the lower surface of the substrate A 4, and the installation glue 5 is obtained after drying, and a release film 6 is compounded on the installation glue;

[0066] (5) Hardening glue is coated on the upper surface of the substrate B 2, and the wear-resistant layer 1 is formed after UV photocuring.

[0067] Comparative Example B:

[0068] The preparation method of the one-way perspective film of the present comparative example is as follows:

[0069] (1) A commercially available aluminum-coated film with a visible light reflectance of 65% is selected, acrylate pressure-sensitive glue is coated on the surface of the metal layer and dried to obtain an installation glue layer, and a release film is compounded on the installation glue layer;

[0070] (2) Hardening glue is coated on the other side of the aluminum-coated film, and the wear-resistant layer is formed after UV photocuring, thereby obtaining a metal film product.

[0071] The composite glue and the installation glue of the above examples and comparative examples adopt LOCTITE DURO-TAK 8063 solvent type acrylate glue of Henkel Company, Germany; and the hardening glue adopts RG-1033HC ultraviolet photocuring hardening liquid of Henkel Company, Germany.

[0072] The films prepared in the examples and comparative examples are attached to glass, and the glass faces the observation chamber. The test comparison is as follows:

[0073] Observed zone illuminance Observed zone illuminance Single perspective naked eye evaluation Example 1 100 lux 800 lux Very good 100 lux 500 lux Good 100 lux 150 lux Better 100 lux 100 lux Fair Example 2 100 lux 800 lux Very good 100 lux 500 lux Good 100 lux 150 lux Better 100 lux 100 lux Fair Comparative Example A 100 lux 500 lux Better 100 lux 300 lux Fair Comparative Example B 100 lux 500 lux Better 100 lux 300 lux Fair

[0074] The following results can be obtained through the test:

[0075] (1) When the high-reflective (visible light reflectance greater than 50%) metal film is combined with the anti-peep layer, i.e. Examples 1 and 2, the light ratio of the observation area to the observed area is controlled at 1:1.5 or a lower ratio, which can ensure a good one-way perspective effect.

[0076] (2) When the low-reflective (visible light reflectance less than 30%) metal film is combined with the anti-peep layer, i.e. Comparative Example A, the light ratio of the observation area to the observed area is at 1:5, which can achieve a good effect. When the light ratio is at 1:3, the effect is general, and the observed area can see the blurred outline of the person or object in the observation area.

[0077] (3) When there is only a high-reflective metal film, i.e. Comparative Example B, the light ratio of the observation area to the observed area is controlled at 1:5, which can achieve a good one-way perspective effect. When the light ratio is at 1:3, the effect is general, and the observed area can see the blurred outline of the person or object in the observation area.

[0078] As can be seen, the combination of the high-reflective metal film and the anti-peep layer can well enhance the one-way perspective effect. After repeated tests, the metal film with a visible light reflectance greater than 50% is combined with the anti-peep layer, which can achieve a relatively ideal effect. The angle of the grating of the anti-peep layer to the substrate is controlled at 25°-65°, which can achieve a good effect. When the angle of the grating to the substrate is 45°, the effect is best.

[0079] In the present application, since the colored grating has an inclination angle, in the embossing process, in order to prevent the occurrence of adhesion, the viscosity of the resin is adjusted to reduce the occurrence of adhesion.

[0080] It should be noted that the above description is only for explaining the preferred embodiments of the present application, and the present application is not limited by the above embodiments. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A method for preparing a one-way transparent membrane, characterized in that: The one-way transparent film comprises, in sequence, a wear-resistant layer, substrate B, privacy layer, substrate A, mounting adhesive, and release film; The method for preparing the one-way transparent film includes the following steps: (1) Apply colored UV resin to the upper surface of substrate A, form a slanted colored grating by embossing, and fix it after UV curing; (2) A layer of transparent composite adhesive is applied to the surface of the cured inclined colored grating, which surrounds the colored grating and together constitutes the privacy layer. (3) A transparent polyester film is laminated onto the upper surface of the transparent composite adhesive to form substrate B; (4) Apply mounting adhesive to the lower surface of substrate A and laminate with release film; (5) Apply hardened adhesive to the upper surface of substrate B and cure it with UV light to form a wear-resistant layer; The visible light reflectance of substrate A is greater than 50%, and the acute angle θ between the colored grating and substrate A is 25°~65°; provided that the colored grating can block parallel light rays in the observed area, the spacing between the colored gratings is ≤ .

2. The method for preparing a one-way transparent film according to claim 1, characterized in that: The substrate A is an aluminum-plated metal film or a magnetron sputtered metal film with a visible light reflectance greater than 50%.

3. The method for preparing a one-way transparent film according to claim 1, characterized in that: The lower end of the colored grating is arranged close to the metal layer on the upper surface of the substrate A, and the colored grating is lower than the height of the transparent composite adhesive layer so that its upper end is located within the transparent composite adhesive layer.

4. The method for preparing a one-way transparent film according to claim 3, characterized in that: By weight, the materials used to prepare the colored UV resin include the following components: Modified aliphatic polyurethane acrylate, 15-80 parts; Adhesion promoter, 0.1~20 parts; Photoinitiator, 0.1~10 parts; Leveling agent, 0.01~1 part; Dilute the solvent, 10-50 parts; Colored dye, 0.01 to 1 part.

5. The method for preparing a one-way transparent film according to claim 4, characterized in that: The method for preparing the colored UV resin is as follows: Mix the photoinitiator and diluent solvent and stir until homogeneous. Then add the modified aliphatic polyurethane acrylate and stir. Add the adhesion promoter and leveling agent and stir again. While measuring the viscosity with a rotational viscometer, adjust the viscosity with the diluent solvent to 500-1000 centipoise. Add the solvent-based dye to the mixture and stir until homogeneous to obtain a uniformly dispersed colored UV resin.

6. The method for preparing a one-way transparent film according to claim 3, characterized in that: The colored grating has a parallelogram cross-section, and the bottom edge of the parallelogram is arranged close to the upper surface of the substrate A. The thickness of the parallelogram in the lateral direction is 2μm to 6μm.

7. The method for preparing a one-way transparent film according to claim 3, characterized in that: The distance between two adjacent colored gratings is 2μm to 6μm, and the thickness of the composite adhesive layer is 6μm to 15μm.

8. The method for preparing a one-way transparent film according to any one of claims 1 to 7, characterized in that: Both the transparent composite adhesive and the mounting adhesive are solvent-based acrylic adhesives, the wear-resistant layer uses a UV-curing adhesive, and the release film is a transparent film used to protect the mounting adhesive.

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