CN218519338U - Composite board - Google Patents

Abstract

The application provides a composite board, which comprises a polycarbonate layer, a photochromic layer and a first protective layer, wherein the photochromic layer is arranged on the polycarbonate layer and is used for absorbing ultraviolet rays; the first protective layer is disposed on the photochromic layer. The application provides a composite board can prolong the life on polycarbonate layer.

Description

Composite board

Technical Field

The application relates to dalle technical field especially relates to a composite board.

Background

Polycarbonate plates (PC plates for short) are mainly made of colorless and transparent amorphous thermoplastic materials, and are widely used in modern buildings and daily life, such as building canopies, windows, touch screens and display screens, due to their advantages of excellent impact resistance, high transparency, high refractive index, high light transmittance, high stability and the like. However, when the PC board is used outdoors, if it is exposed to the sun frequently, the long-term ultraviolet irradiation damages the PC board, which reduces the life span of the PC board.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present application provides a composite board, which can solve the above problems.

The application provides a composite board, which comprises a polycarbonate layer, a photochromic layer and a first protective layer, wherein the photochromic layer is arranged on the polycarbonate layer and is used for absorbing ultraviolet rays; the first protective layer is disposed on the photochromic layer.

In some embodiments, the composite sheet further comprises a second protective layer disposed on a surface of the polycarbonate layer facing away from the photochromic layer.

In some embodiments, the second protective layer has a thickness of 5% to 7% of the thickness of the polycarbonate layer.

In some embodiments, the first protective layer and the second protective layer are each acrylic layers.

In some embodiments, the second protective layer comprises one of benzotriazoles, benzophenones, or triazines for absorbing ultraviolet light.

In some embodiments, the first protective layer has a thickness of 5% to 7% of the thickness of the polycarbonate layer.

In some embodiments, the photochromic layer is formed on the polycarbonate layer in a cured manner.

In some embodiments, the photochromic layer comprises one of spiropyrans, spirooxazines, azobenzenes, hexaphenylbisimidazoles, stilbenes, fused ring aromatic compounds, or fulgides.

In some embodiments, the photochromic layer is 5 μm to 10 μm thick.

In the application, because the polycarbonate has the characteristics of excellent structural strength, impact resistance, wide use temperature range, high transparency, small expansion and contraction effect, fatigue resistance and the like, and the polycarbonate has no toxicity, on the basis, the polycarbonate layer is selected as the matrix and is used as the support main body of the composite board, so that the overall structural strength of the composite board can be improved on the basis; the photochromic coating on the polycarbonate layer generates color change by absorbing ultraviolet rays, so that the composite board not only has a decorative function, but also can prevent the ultraviolet rays from further irradiating the polycarbonate layer through the photochromic coating, and the service life of the polycarbonate layer is prolonged; the first protective layer that sets up in this application mainly used protects photochromic layer, avoids photochromic layer to receive external environment (acid, alkali or scratch) influence and drop or damaged, in addition, because ya keli (PMMA for short) has high luminousness (93%), printing opacity light is soft, the durability is strong, weather resistance advantage such as good, PMMA is chooseed for use as the protective layer to first protective layer, can also further prolong composite board's life.

Drawings

Fig. 1 is a schematic structural diagram of a cross section of a composite board provided in an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a composite board manufacturing process provided in an embodiment of the present application.

Description of the main elements

Composite board 100

Polycarbonate layer 10

Photochromic layer 20

First protective layer 30

Second protective layer 40

Roller 200

Coating machine 300

Laminating and laminating equipment 400

The following detailed description will further illustrate the present application in conjunction with the above-described figures 1-2.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

To further explain the technical means and effects of the present application for achieving the intended purpose, the present application will be described in detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1, a composite board 100 includes a first protective layer 30, a photochromic layer 20, a polycarbonate layer 10, and a second protective layer 40, which are sequentially stacked. The photochromic layer 20 may be formed on the polycarbonate layer 10 by coating a photochromic material and curing it by heating. This way the risk of detachment of the photochromic layer 20 from the polycarbonate layer 10 can be reduced. When the composite board 100 is irradiated by sunlight, the sunlight irradiates on the photochromic layer 20, the color of the photochromic layer 20 is darkened, the intensity of the sunlight penetrating through the composite board 100 is reduced, meanwhile, the photochromic layer 20 can absorb long-wave band ultraviolet light (UVA) and middle-wave band ultraviolet light (UVB) of 280 nm-400 nm, the ultraviolet light is prevented from irradiating the polycarbonate layer 10, and the service life of the polycarbonate layer 10 is prolonged.

Referring to fig. 1, a first protective layer 30 is disposed on the photochromic layer 20 for protecting the photochromic layer 20 from dropping the photochromic layer 20 or from being corroded by external environment (acidic or alkaline) to change the performance of the photochromic layer 20.

In some embodiments, the photochromic layer 20 is a polymer material. The photochromic layer 20 comprises one of spiropyrans, spirooxazines, azobenzenes, hexaphenylbenzimidazole, stilbenes, fused-ring aromatic compounds or fulgides, and is obtained by mixing with an antioxidant and a light stabilizer. The photochromic layer 20 is formed of a material that is capable of undergoing a color change upon activation by a light source. The color of the photochromic layer 20 may be changed in shade according to the intensity of illumination.

Referring to fig. 1, the second protective layer 40 is disposed on a surface of the polycarbonate layer 10 facing away from the photochromic layer 20. The second protective layer 40 can further protect the polycarbonate layer 10. In some embodiments, acrylic (PMMA) is used for both the first protective layer 30 and the second protective layer 40. The acrylic material has excellent light transmission performance and strong durability, and has good protection effect on the photochromic layer 20 and the polycarbonate layer 10. Meanwhile, the acrylic material has strong weather resistance, does not fade, and cannot be influenced by ultraviolet rays in sunlight, so that the service life of the composite board 100 is effectively prolonged.

In some embodiments, the sunlight can directly pass through the first protection layer 30 to the photochromic layer 20, and the first protection layer 30 has no barrier to the ultraviolet light in the sunlight, and may specifically adopt a conventional acrylic material. The second protection layer 40 has a function of blocking ultraviolet light, and specifically, based on the characteristics of the acrylic material, the second protection layer 40 is also made of the acrylic material, but different from the first protection layer 30, the second protection layer 40 containing the acrylic material further contains any one of benzotriazole, benzophenone, or triazine. The benzotriazole, benzophenone or triazine has the function of absorbing ultraviolet rays, and the second protective layer 40 containing the agent with the absorption line can absorb the ultraviolet rays irradiated on the second protective layer 40, so that the ultraviolet rays are prevented from penetrating into a building or a vehicle.

In some embodiments, the thickness of the first protective layer 30 is 5% -7% of the thickness of the polycarbonate layer 10. Within this range, the photochromic layer 20 may be effectively protected. If the thickness of the first protective layer 30 is too thin, the photochromic layer 20 cannot be protected, and if the thickness of the first protective layer 30 is too thick, the production cost of the composite sheet 100 may increase.

In some embodiments, the thickness of the second protective layer 40 is 5% -7% of the thickness of the polycarbonate layer 10, and within this thickness range, the second protective layer 40 can improve the structural strength of the composite material to protect the polycarbonate layer 10. In practical applications, the thicknesses of the first protective layer 30 and the second protective layer 40 can be set according to practical production requirements.

In some embodiments, the photochromic layer 20 is 5 μm to 10 μm thick. Within this thickness range, the photochromic layer 20 may sufficiently absorb ultraviolet rays in sunlight. If the thickness of the photochromic layer 20 is too large, the light transmittance of sunlight through the composite panel 100 may be reduced; if the thickness of the photochromic layer 20 is too small, the photochromic layer 20 is less discolored by the ultraviolet rays, and the blocking effect against the ultraviolet rays is not significant.

Referring to fig. 1 and 2, in the present application, the preparation steps of the composite board 100 include:

(1) Respectively heating and extruding the polycarbonate plastic particles and the acrylic particles, and respectively and correspondingly forming the integrally combined polycarbonate layer 10 and the second protective layer 40.

The polycarbonate plastic particles and the acrylic particles are heated and extruded by plastic co-extrusion equipment, and the polycarbonate layer 10 and the second protective layer 40 are integrated by pressing through the roller 200 at a high temperature. Wherein the thickness of the second protective layer 40 is 5% of the thickness of the polycarbonate layer 10. In some embodiments, the thickness of the polycarbonate layer 10 may be set according to production requirements.

(2) After the laminated polycarbonate layer 10 and the second protective layer 40 are leveled and cooled, the photochromic coating is coated on the surface of the polycarbonate layer 10 and cured to obtain the photochromic layer 20.

The photochromic coating material is coated on the polycarbonate layer 10 by a coater 300, and is cured on the polycarbonate layer 10 by irradiation of an ultraviolet lamp, thereby forming the photochromic layer 20.

(3) An acryl film is coated on the polycarbonate layer 10 in which the photochromic layer 20 is cured, so that the acryl film (the first protective layer 30) completely covers the photochromic layer 20, resulting in the composite panel 100.

Specifically, the lamination equipment 400 may be used to uniformly coat the acryl film on the photochromic layer 20 to protect the photochromic layer 20. Wherein the thickness of the first protective layer 30 is 80 μm.

In the present application, the light transmittance of the composite board 100 is higher than 85% or more.

In the application, because the polycarbonate has the characteristics of excellent structural strength, impact resistance, wide use temperature range, high transparency, small heat expansion and cold contraction effect, fatigue resistance and the like, and the polycarbonate has no toxicity, on the basis, the polycarbonate layer 10 is selected as the matrix and is used as the support main body of the composite board 100, so that the overall structural strength of the composite board 100 can be improved on the basis; the photochromic coating on the polycarbonate layer 10 absorbs ultraviolet rays to generate color change, so that the composite board 100 not only has a decorative function, but also can prevent the ultraviolet rays from further irradiating the polycarbonate layer 10 through the photochromic coating, and the service life of the polycarbonate layer 10 is prolonged; the first protection layer 30 that sets up in this application is used for protecting photochromism layer 20, avoids photochromism layer 20 to receive external environment (acid, alkali or scratch) influence and drop or damage, in addition, because ya keli (for short PMMA) has the luminousness and can reach 93%, printing opacity light is soft, the durability is strong, weather resistance is good, PMMA is selected for use as the protection layer to first protection layer 30, can also further prolong composite board 100's life.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims (6)

1. The composite board is characterized by consisting of a first protective layer, a photochromic layer, a polycarbonate layer and a second protective layer;

the photochromic layer is fixed on the polycarbonate layer and is in direct contact with the polycarbonate layer, and the photochromic layer is used for absorbing ultraviolet rays;

the first protective layer is fixed on the photochromic layer and is in direct contact with the photochromic layer;

the second protective layer is fixed in the polycarbonate layer deviates from the surface of photochromism layer and with the polycarbonate layer direct contact, first protective layer with the second protective layer is the ya keli layer.

2. The composite sheet of claim 1, wherein the thickness of the second protective layer is 5% to 7% of the thickness of the polycarbonate layer.

3. The composite sheet of claim 1, wherein the first protective layer has a thickness of 5% to 7% of the thickness of the polycarbonate layer.

4. The composite panel of claim 1, wherein said photochromic layer is formed on said polycarbonate layer in a cured manner.

5. The composite board according to claim 1, wherein the photochromic layer is made of one of spiropyran, spirooxazine, azobenzene, hexaphenylbisimidazole, stilbenes, fused-ring aromatic compound, and fulgide.

6. The composite sheet of claim 1, wherein the photochromic layer is 5 μ ι η to 10 μ ι η thick.

Images