CN111175865A

CN111175865A - Compound little prism reflective membrane

Info

Publication number: CN111175865A
Application number: CN202010054269.3A
Authority: CN
Inventors: 王先淋; 卓炎庭; 刘德为
Original assignee: Fujian Anyuan Optical Technology Co ltd
Current assignee: Fujian Anyuan Optical Technology Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-05-19
Anticipated expiration: 2040-01-17
Also published as: CN111175865B

Abstract

The invention provides a composite micro-prism reflective membrane, which comprises the following stacked components: a flexible PET surface layer; a light reflecting layer comprising a plurality of regular hexagonal repeating units; each regular hexagon repeating unit comprises six triangular pyramids with regular triangles on the bottom surfaces, and the side surface of each triangular pyramid close to the edge of each regular hexagon repeating unit is an isosceles triangle; a metallic aluminum layer; a pressure sensitive adhesive layer; and a release layer.

Description

Compound little prism reflective membrane

Technical Field

The invention relates to a reflective membrane, in particular to a composite micro-prism reflective membrane.

Background

At present, the existing high-strength reflecting films generally comprise two major types of sealing capsule type glass bead type reflecting structures and microprism reflecting films. However, the glass bead reflective film has the technical problems of dark color, small retroreflective angle, short visible distance and the like. Microprism reflective films can solve the above problems. But compared with a non-directional glass bead reflecting structure, the micro-prism reflecting structure has directionality, the retroreflection coefficients of the reflecting film in different directions are uneven, the visible angle range is small, and the warning safety when the micro-prism reflecting structure is used as a traffic sign is greatly reduced.

Disclosure of Invention

The invention provides a composite micro-prism reflective membrane which can effectively solve the problems.

The invention is realized by the following steps:

the invention provides a composite micro-prism reflective membrane, which comprises the following stacked components:

a flexible PET surface layer;

a light reflecting layer comprising a plurality of regular hexagonal repeating units; each regular hexagon repeating unit comprises six triangular pyramids with regular triangles on the bottom surfaces, and the side surface of each triangular pyramid close to the edge of each regular hexagon repeating unit is an isosceles triangle;

a metallic aluminum layer;

a pressure sensitive adhesive layer; and

and a release layer.

As a further improvement, the projection of the apex of each triangular pyramid on the base surface is disposed close to the edge of the regular hexagonal repeating unit.

As a further improvement, the projection of the vertex of each triangular pyramid on the bottom surface is arranged at the midpoint of the connecting line from the center to the base of the regular triangle.

As a further improvement, the height h of the triangular pyramid is 0.04-0.06 mm, and the side length of the regular triangle is

As a further improvement, the thickness of the flexible PET surface layer is 0.3-0.5 mm, and the thickness of the metal aluminum layer is 0.02-0.08 mm.

The invention has the beneficial effects that: the composite micro-prism reflective membrane provided by the invention can effectively solve the problem of direction sensitivity of the micro-prism reflective membrane, and the triangular cone of the composite micro-prism reflective membrane can receive incident light in a large angle range and return the reflected light to irradiate out in the original way.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a composite micro-prism light-reflecting film provided in an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a light reflection layer in the composite micro-prism light reflection film according to the embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a triangular pyramid in the composite micro-triangular prism light-reflecting film provided by the embodiment of the invention.

Fig. 4 is a schematic structural diagram of a regular hexagonal repeating unit in the composite micro-prism light-reflecting film provided by the embodiment of the present invention.

Fig. 5 to 6 are graphs showing test results of the composite type micro-prism reflective film according to the embodiment of the present invention.

Fig. 7 is a photograph of a composite type micro-prism reflective film according to a comparative example of the present invention after being left for 30 days.

Fig. 8 is a photograph of the composite micro-prism reflective film according to the embodiment of the present invention after the coating liquid is left for 60 days.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Referring to fig. 1 to 6, a composite micro-prism reflective film includes:

a flexible PET skin layer 10;

a light reflection layer 11 including a plurality of regular hexagonal repeating units; each regular hexagon repeating unit comprises six triangular pyramids with regular triangles on the bottom surfaces, and the side surface of each triangular pyramid close to the edge of each regular hexagon repeating unit is an isosceles triangle;

a metallic aluminum layer 12;

a pressure-sensitive adhesive layer 13; and

and a release layer 14.

The flexible PET surface layer 10 is made of transparent, bending-resistant and shrinkage-resistant materials, and the thickness of the flexible PET surface layer is 0.3-0.5 mm.

The light reflection layer 11 may be formed by hot-pressing a transparent polymer organic resin layer.

As a further improvement, the projection of the apex of each triangular pyramid on the bottom surface is disposed close to the edge of the regular hexagonal repeating unit, so that the connecting lines between the apexes of the triangular pyramids form an inner regular hexagon (see fig. 4). Referring to fig. 3, in one embodiment, the projection of the vertex of each triangular pyramid on the bottom surface is arranged at the midpoint of a connecting line from the center to the bottom side of the regular triangle. And the height of the triangular pyramid is defined as h, and the side length of the regular triangle is defined as

The height h of the triangular pyramid can be 0.04-0.06 mm. In one embodiment, the height h of the triangular pyramid is about 0.06mm, and the side length of the regular triangle is 0.21 mm. It can be understood that by controlling the height h of the triangular pyramid and the side length of the regular triangle, it is possible to improve the coefficient of retroreflection and maintain the superior effects of uniformity and consistency of brightness.

As a further improvement, the metal aluminum layer can be formed by an evaporation process, and the thickness of the metal aluminum layer is 0.02-0.08 mm.

The thickness of the pressure sensitive adhesive layer 13 is not limited and can be selected according to actual needs.

referring to fig. 5-6, the retroreflective performance under a wide angle range of 0.2 and 0.5 ° observation angles α provided by the embodiments of the present invention is shown, and it can be seen that the retroreflective performance under the wide angle range is good, and the uniformity and consistency of the brightness can be maintained.

As a further improvement, the surface of the flexible PET skin layer 10 remote from the light reflection layer 11 may be further provided with a scratch-resistant layer 15. The scratch-resistant layer 15 is obtained by applying a coating liquid to the flexible PET surface layer 10. The coating liquid comprises 40-50 parts by weight of polyurethane acrylic oligomer, 15-20 parts by weight of acrylate, 5-7 parts by weight of functionalized carbon nano tube and 1-3 parts by weight of photoinitiator. The length of the functionalized carbon nanotube is 500-2000 nm. The preparation of the coating liquid comprises the following steps:

s1, placing the carbon nano tube in a mixed acid solution of concentrated sulfuric acid and concentrated nitric acid, then carrying out ultrasonic treatment on the mixture, standing, filtering, repeatedly washing to be neutral, and drying to obtain a functionalized carbon nano tube;

and S2, dissolving the polyurethane acrylic acid oligomer and the acrylic ester in an organic solvent, adding the functionalized carbon nano tube, carrying out ultrasonic oscillation for 10-30 minutes, and finally adding the photoinitiator to form a coating liquid with the solid content of about 40%.

The coating liquid can be stored for more than 60 days in a dark environment without generating obvious precipitation. Experiments show that the shelf life of the coating liquid increases significantly with increasing carbon nanotube content. This is probably because the carbon nanotubes will absorb light to some extent, and avoid the action of the photoinitiator. Referring to fig. 7, when the amount of the carbon nanotubes is about 3 parts, the shelf life thereof is only about 30 days, and significant sedimentation occurs after 30 days. Referring to fig. 8, when the content of the carbon nanotubes is about 8 parts, the shelf life of the carbon nanotubes can be more than 60 days, and no significant sedimentation occurs after 60 days.

The coating liquid is coated on the surface of the flexible PET surface layer 10, and the thickness of the formed scratch-proof layer 15 is 4-6 mu m.

Example 1:

s2, dissolving 45 parts by weight of urethane acrylate oligomer and 18 parts by weight of acrylate in an organic solvent, adding 5 parts by weight of functionalized carbon nanotubes, ultrasonically shaking for 10 minutes, finally adding 1.5 parts by weight of photoinitiator to form a coating solution with a solid content of about 40%, coating the coating solution on the surface of the flexible PET surface layer 10 to form a scratch-resistant layer 15 with a thickness of about 5 μm, and performing the tests shown in table 1.

Example 2:

substantially the same as in example 1 except that 8 parts by weight of the functionalized carbon nanotubes were added.

Comparative example 1:

substantially the same as in example 1 except that 10 parts by weight of the functionalized carbon nanotubes were added.

Comparative example 2:

substantially the same as in example 1 except that 3 parts by weight of the functionalized carbon nanotubes were added.

Serial number	Haze%)	Light transmittance%	Hardness of pencil
				Example 1	1.2％	90.2％	7H
Example 2	1.5％	89.7％	8H
				Comparative example 1	5.1％	82.1％	9H
Comparative example 2	0.8％	91.0％	7H

It can be seen that the haze and hardness increase with the increase of the content of the carbon nanotubes. Particularly, when the content is more than 10 parts, the haze is obviously increased, and the light transmittance is obviously reduced, which is obviously not beneficial to the application in the field of reflective films. In addition, since the carbon nanotubes have a long length, when the content thereof is increased, the surface of the scratch-resistant layer 15 is easily protruded to remarkably increase the haze thereof.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a compound little prism reflective membrane which characterized in that: comprises the following steps of:

a flexible PET surface layer;

a metallic aluminum layer;

a pressure sensitive adhesive layer; and

and a release layer.

2. The composite micro-triangular prism light-reflecting film according to claim 1, wherein a projection of an apex of each triangular pyramid on the bottom surface is disposed near an edge of the regular hexagonal repeating unit.

3. The composite micro triangular prism reflective membrane according to claim 2, wherein a projection of a vertex of each triangular pyramid on the bottom surface is disposed at a midpoint of a line connecting a center of the regular triangle to a base.

4. The reflective film of claim 3, wherein the height h of the triangular pyramid is 0.04 to 0.06mm, and the side length of the regular triangle is

5. The reflective film according to claim 1, wherein the thickness of the surface layer of the flexible PET is 0.3 to 0.5mm, and the thickness of the metal aluminum layer is 0.02 to 0.08 mm.