WO2018192261A1

WO2018192261A1 - Prism type reflective film and preparation method therefor

Info

Publication number: WO2018192261A1
Application number: PCT/CN2017/119308
Authority: WO
Inventors: 郭森; 阳志荣; 汪加胜; 唐舫成
Original assignee: 广州鹿山新材料股份有限公司; 江苏鹿山光电科技有限公司
Priority date: 2017-04-20
Filing date: 2017-12-28
Publication date: 2018-10-25
Also published as: CN106997067A

Abstract

A prism type reflective film, comprising a support layer, a reflective layer (10), and an adhesive layer (40); the support layer comprises a prism layer (20) and a fixed layer (30) arranged in sequence from top to bottom; the prism layer (20) is an acrylate polymer layer; the reflective layer (10) is arranged above the prism layer (20); and the adhesive layer (40) is arranged below the fixed layer (30), the adhesive layer (40) being a hot melt adhesive layer. The prism layer (20) of the prism type reflective film is formed of an acrylate polymer, having good deformation resistance and being able to bond well with the reflective layer (10), ensuring the stability of the prism structure; in addition, the bottom part adhesive layer (40) is formed of hot melt adhesive, being able to adhere to irregular material surfaces and having good weatherability. A preparation method for the prism type reflective film, having few steps, a simple procedure, safe operation, and low costs.

Description

Prism type reflective film and preparation method thereof

Technical field

The present application relates to the field of reflective film technology, and in particular, to a prism type reflective film and a preparation method thereof.

Background technique

The reflective film is a retroreflective material that can be directly applied to a film, and is also the most widely used retroreflective material. According to the classification of the structure of the reflective film reflecting unit, the reflecting layer mainly has two types of prism type and glass bead type, and the prism type reflecting film is attracting attention due to high brightness. From the structure of the reflective film, the reflective film is mainly composed of a reflective layer, a support layer and an adhesive layer.

However, the existing prism type retroreflective film mainly has the following defects:

(1) The support layer has poor resistance to deformation and poor adhesion to the reflective layer;

(2) The adhesive layer is mostly made of pressure-sensitive adhesive. The pressure-sensitive adhesive has good adhesion on smooth metal surface, wood surface and other flat surface, and can maintain effective adhesion for a long time, but in stone, cement, etc. The irregular surface is difficult to adsorb, and the weather resistance of the pressure sensitive adhesive is poor, so that the reflective film is less reliable when used outdoors.

Summary of the invention

In order to overcome the deficiencies of the prior art, one of the objects of the present application is to provide a prism type retroreflective film whose prism layer is formed of an acrylate polymer, has good deformation resistance, and can be well adhered to the reflective layer. The stability of the prism structure is ensured; at the same time, the bottom adhesive layer is formed of a hot melt adhesive material, can adhere to irregular material surfaces, and has good weather resistance.

The second object of the present application is to provide a method for preparing a prism type retroreflective film, which has fewer steps, simple process, safe operation and low cost.

One of the purposes of the present application is achieved by the following technical solutions:

In a first aspect, the present application provides a prismatic retroreflective film comprising a support layer, a light reflecting layer and an adhesive layer; and the support layer comprises a prism layer and a fixed layer disposed one above another; the prism layer is acrylic An ester polymer layer; the light reflecting layer is disposed above the prism layer; the adhesion layer is disposed under the fixing layer, and the adhesion layer is a hot melt adhesive layer.

Further, the prism layer is composed of a plurality of prism columns arranged in parallel; the bottoms of two adjacent prism columns are in contact with each other, and the distance between the peaks is 25-400 μm; the number of top angles of the prism columns is 90-150°; the distance between the apex angle and the bottom of the prism column is recorded as the thickness of the prism layer, and the thickness of the prism layer is 15-50 μm.

Further, the thickness of the fixing layer is 2-5 times the thickness of the prism layer.

Further, the reflective layer has a thickness of 25-70 nm.

Further, the adhesive layer has a melting point of less than 120 ° C and a thickness of 20-50 μm.

Further, the sum of the thicknesses of the support layer, the light reflecting layer and the adhesion layer is ≤200 μm.

Further, the light reflecting layer is a metal aluminum layer or a metal silver layer; the fixed layer is a plastic fixed layer.

Further, the metal aluminum and the metal silver are pure metals; the plastic fixing layer is a PET layer, a PC layer or a PA plastic layer.

The second object of the present application is implemented by the following technical solutions:

In a second aspect, the present application further provides a method for preparing a prismatic retroreflective film according to the first aspect, which comprises the following steps:

1) taking the fixed layer, coating a surface thereof with an acrylate polymer, and curing;

2) micro-engraving the surface of the cured acrylate polymer layer to form the prism layer;

3) coating a surface of the prism layer to form the reflective layer;

4) coating a layer of hot melt adhesive on the back side of the fixing layer to form the adhesive layer.

Further, in the step 1), the curing mode is ultraviolet curing; in the step 3), the surface of the prism layer is plated with metallic silver or metallic aluminum by vacuum deposition to form the light reflecting layer.

Compared with the prior art, the beneficial effects of the present application are:

(1) The prism type retroreflective film provided by the present application, wherein the prism layer of the reflective film is formed of an acrylate polymer, has good deformation resistance, and can be well adhered to the reflective layer to ensure the stability of the prism structure; The bottom adhesive layer is formed of a hot melt adhesive material, has a good fast bonding function, can adhere to irregular material surfaces, and has good weather resistance. The layer of the reflective film is directly bonded to the layer, and is bonded without using an adhesive. The structure is simple, the stability is good, and the cost is low.

(2) The preparation method of the prism type retroreflective film provided by the present application has few steps, simple process, safe operation and low cost.

DRAWINGS

Figure 1 is a schematic view of a prismatic retroreflective film provided by the present application;

In the figure: 10, reflective layer; 20, prism layer; 30, fixed layer; 40, adhesion layer.

detailed description

In the following, the present application will be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments described below or the technical features can be arbitrarily combined to form a new embodiment. .

As shown in FIG. 1, a prism type retroreflective film comprises a support layer, a light reflecting layer 10 and an adhesion layer 40; the support layer comprises a prism layer 20 and a fixed layer 30 arranged one above another; the prism layer 20 is an acrylate polymer layer. The light reflecting layer 10 is disposed above the prism layer 20; the adhesive layer 40 is disposed under the fixed layer 30, and the adhesive layer 40 is a hot melt adhesive layer.

Next, the manner of setting the prism type retroreflective film will be further described.

As shown in FIG. 1, the prism layer 20 is composed of a plurality of prism columns arranged in parallel; the bottoms of two adjacent prism columns are in contact with each other, and the distance between the peaks is 25-400 μm; the number of top angles of the prism columns is 90- 150°; the distance between the apex angle of the prism column and the bottom is recorded as the thickness of the prism layer 20, and the thickness of the prism layer 20 is 15-50 μm.

The thickness of the fixed layer 30 is 2-5 times the thickness of the prism layer 20; the thickness of the reflective layer 10 is 25-70 nm; the melting point of the adhesion layer 40 is less than 120 ° C, and the thickness is 20-50 μm; the support layer, the reflective layer 10 and the adhesive layer The sum of the thicknesses of the layer 40 is ≤ 200 μm.

In addition, the reflective layer 10 is a metal aluminum layer or a metal silver layer, the metal aluminum and the metal silver are pure metals; the fixed layer 30 is a plastic fixed layer, and the plastic fixed layer may be a PET layer, a PC layer or a PA plastic layer.

A method for preparing a prismatic retroreflective film comprises the following steps:

1) taking the fixed layer 30, coating a layer of acrylate polymer on the surface thereof, and curing by ultraviolet light;

2) micro-engraving the surface of the cured acrylate polymer layer to form a prism layer 20;

3) using a vacuum deposition method on the surface of the prism layer 20 is plated with metallic silver or metal aluminum to form a light reflecting layer 10;

4) A layer of hot melt adhesive is applied to the back surface of the fixed layer 30 to form an adhesive layer 40.

Example 1

A prism type reflective film is prepared in the following steps: a PC film having a thickness of 75 μm is coated on the surface thereof with a layer of acrylate having a thickness of 20 μm, and rapidly cured under an ultraviolet lamp; and then the cured acrylate polymer is cured. The surface is micro-engraved to produce a prism structure with a thickness of 15 μm and a top angle of 90°. The pitch of the peaks of the prisms is 30 μm. Then, a 25 nm thick aluminum film is deposited on the prism layer by vacuum deposition; The back side is coated with a layer of hot melt adhesive of 20 μm thickness.

The reflectance of the prismatic retroreflective film obtained in Example 1 was measured using a colorimeter, and as a result, it was 75%, which had a high reflection efficiency.

Example 2

A prism type reflective film is prepared in the following steps: a PET film having a thickness of 90 μm is coated on the surface thereof with a layer of acrylate having a thickness of 40 μm, and rapidly cured under an ultraviolet lamp; and then the cured acrylate polymer is cured. The surface is micro-engraved, and a prism structure having a thickness of 30 μm and a vertex angle of 120° is formed, and the pitch of the peaks of the prisms is 104 μm; then, a silver film of 50 nm thickness is plated on the prism layer by vacuum deposition; finally, The back side of the PET film was coated with a 30 μm thick hot melt adhesive.

The reflectance of the prismatic retroreflective film obtained in Example 2 was measured using a colorimeter, and as a result, it was 85%, and had a high reflection efficiency.

Example 3

A prism type reflective film is prepared in the following steps: a PA film having a thickness of 100 μm is coated on the surface thereof with a layer of acrylate having a thickness of 60 μm, and rapidly cured under an ultraviolet lamp; and then the cured acrylate polymer is cured. The surface is micro-engraved to produce a prism structure with a thickness of 50 μm and a top angle of 90°. The pitch of the peaks of the prisms is 374 μm. Then, a layer of 70 nm thick aluminum film is deposited on the prism layer by vacuum deposition; finally, in the PA The back side of the film was coated with a 50 μm thick hot melt adhesive.

The reflectance of the prismatic retroreflective film obtained in Example 3 was measured using a colorimeter, and as a result, it was 90%, and had a high reflection efficiency.

The prismatic retroreflective film provided in Examples 1-3 of the present application has the following excellent features:

(1) The reflective film not only has high reflection brightness, but also can flexibly change the number of top angles of the prism column, the thickness of the prism column and the spacing between the peaks during micro-engraving according to actual needs to adjust the reflected light. Strength and light path, practicality;

(2) The prism layer 20 is formed of an acrylate polymer, has good deformation resistance, and can be well adhered to the metal reflective layer 10 to ensure the stability of the prism structure;

(3) The bottom adhesive layer 40 is formed of a hot melt adhesive material, and the hot melt adhesive has good fast adhesive property, can adhere to the irregular material surface, and improves the weather resistance of the reflective film;

(4) The fixed layer 30 is a PET layer, a PC layer or a PA plastic layer. These materials have a certain tensile strength, which can effectively maintain the structural stability of the reflective film and enhance the weather resistance;

(5) In the preparation process, the layer of the reflective film is directly bonded to the layer, and no additional adhesive is used for bonding, the steps are small, the process is simple, the operation is safe, the cost is low, and the molded product has a simple structure. Good stability.

The above embodiments are only preferred embodiments of the present application, and the scope of the present application is not limited thereto. Any non-substantial changes and substitutions made by those skilled in the art based on the present application belong to the present application. The scope of the claim.

Claims

A prism type retroreflective film comprising a support layer, a light reflecting layer and an adhesive layer;

And, the support layer comprises a prism layer and a fixed layer disposed in sequence; the prism layer is an acrylate polymer layer;

The light reflecting layer is disposed above the prism layer;

The adhesive layer is disposed under the fixed layer, and the adhesive layer is a hot melt adhesive layer.
The prismatic retroreflective film according to claim 1, wherein the prism layer is composed of a plurality of prism columns arranged in parallel; the bottoms of two adjacent prism columns are in contact with each other with a spacing between the peaks of 25- 400 μm; the number of apex angles of the prism column is 90-150°; the distance between the apex angle and the bottom of the prism column is recorded as the thickness of the prism layer, and the thickness of the prism layer is 15-50 μm.
The prismatic retroreflective film according to claim 2, wherein the fixing layer has a thickness of 2 to 5 times the thickness of the prism layer.
The prismatic retroreflective film according to any one of claims 1 to 3, wherein the light reflecting layer has a thickness of 25 to 70 nm.
The prismatic retroreflective film according to any one of claims 1 to 3, wherein the adhesive layer has a melting point of less than 120 ° C and a thickness of 20 - 50 μm.
The prismatic retroreflective film according to any one of claims 1 to 3, wherein a sum of thicknesses of the support layer, the light reflecting layer and the adhesive layer is ≤ 200 μm.
The prismatic retroreflective film according to any one of claims 1 to 3, wherein the light reflecting layer is a metal aluminum layer or a metallic silver layer; and the fixed layer is a plastic fixed layer.
The prismatic retroreflective film according to claim 7, wherein the metal aluminum and the metallic silver are both pure metals; and the plastic fixing layer is a PET layer, a PC layer or a PA plastic layer.
A method of producing a prismatic retroreflective film according to any one of claims 1 to 3, which comprises the steps of:

1) taking the fixed layer, coating a surface thereof with an acrylate polymer, and curing;

2) micro-engraving the surface of the cured acrylate polymer layer to form the prism layer;

3) coating a surface of the prism layer to form the reflective layer;

4) coating a layer of hot melt adhesive on the back side of the fixing layer to form the adhesive layer.
The method for preparing a prismatic retroreflective film according to claim 9, wherein in the step 1), the curing mode is ultraviolet curing; in the step 3), the surface of the prism layer is plated by vacuum deposition. Metallic silver or metallic aluminum forms the light reflecting layer.