WO2022227000A1

WO2022227000A1 - Multi-refractive index light diffusion plate and synthesis method therefor

Info

Publication number: WO2022227000A1
Application number: PCT/CN2021/091486
Authority: WO
Inventors: 张建林; 张黎明
Original assignee: 苏州三鑫时代新材料股份有限公司
Priority date: 2021-04-29
Filing date: 2021-04-30
Publication date: 2022-11-03
Also published as: CN113176623B; CN113176623A

Abstract

A multi-refractive index light diffusion plate and a synthesis method therefor. The multi-refractive index light diffusion plate mainly comprises three layers, namely a first outer surface layer, a second outer surface layer and an intermediate layer, wherein the three layers of the diffusion plate have the same base material, and functional particles in the first outer surface layer and the second outer surface layer are the same and are used for improving special functions of the surface layers. 1%-2% by weight of melamine formaldehyde resin and silicon dioxide composite microspheres are added into the first outer surface layer, the second outer surface layer and the intermediate layer, refraction angles of light are enriched by means of introducing a light diffusion agent with a high refractive index angle, the possibility of the refraction angles of the light passing through different materials is increased, and the direction of the light is changed more significantly, such that when light from a light source passes through the light diffusion plate, a better light mixing effect is provided, the light transmittance is greatly increased, most market requirements can be met, and requirements and development of TFT-LCD products are met.

Description

A kind of multi-refractive index light diffusing plate and its synthesis method

technical field

The invention relates to the field of optoelectronic materials, and more particularly, to a multi-refractive index light diffusing plate and a synthesis method thereof.

Background technique

Light diffusers have been widely used in liquid crystal display, LED lighting and imaging systems to fully diffuse the incident light and achieve a softer and more uniform illumination effect. The light diffusing plate is formed by adding a light diffusing agent to the raw material when producing a solid plate. The diffusing agent is evenly distributed in the plate, so that when the light passes through the plate, it will reflect, refract and scatter when it encounters the particles of the diffusing agent, so that the light can pass through the plate evenly without exposing the light source. Variation of surface light sources. It is suitable for direct-lit LED TV backlight modules and LED lighting, with high brightness and high diffusivity, which can improve the even diffusion effect of the luminous distribution of the backlight source.

The light diffuser is a diffuser layer that uses PMMA/PC/PE/PS as the plastic substrate. When it encounters diffusing particles with different refractive indices, it will refract, reflect and scatter in multiple directions and angles. In order to obtain the optical diffusion effect, the refractive index of the existing optical grade polystyrene is 1.51-1.52; the refractive index of the silicone particles is 1.42-1.45, the refractive index of the PMMA particles is 1.45-1.49, and the refractive index of the titanium dioxide particles is 1.42-1.45, can you find an existing low-cost material with a different refractive index from the above-mentioned materials, so that the light passes through different materials, and the angle of refraction is different, thereby changing the direction of the light, so that the light source passes through the light diffuser plate The large increase in light transmittance has become a problem that needs to be solved at present.

SUMMARY OF THE INVENTION

In view of this, the present invention proposes a multi-refractive index light diffusing plate and a method for synthesizing the same, which mainly include three layers, namely a first outer surface layer 1, a second outer surface layer 3 and an intermediate layer 2, wherein the above The base material of the three-layer diffuser plate is the same, and the functional particles in the first outer surface layer 1 and the second outer surface layer 3 are the same, which are used to enhance the special functions of the surface layer, such as anti-UV, anti-static, hair The innovation of the present invention lies in that the first outer surface layer 1, the second outer surface layer 3 and the middle layer 2 are all added with 1%-2% by mass of melamine formaldehyde resin and silica composite microspheres 4. The main components of melamine formaldehyde resin and silica composite microspheres 4 are melamine formaldehyde resin, melamine and formaldehyde raw materials are cheap and easy to obtain, and the reaction conditions of the two are mild and the reaction rate is relatively fast. The refractive index of the silicon oxide composite microsphere 4 is 1.6-1.7. By introducing a light diffusing agent with a high refractive index angle, the refraction angle of the light is enriched, and the possibility of the refraction angle of the light passing through different materials is increased. More changes The direction of the light makes the light mixing effect better when the light source passes through the light diffusion plate, and the light transmittance is greatly increased, which can meet most market demands and meet the needs and development of TFT-LCD products.

A multi-refractive index light diffusing plate, comprising: a first outer surface layer 1, an intermediate layer 2, a second outer surface layer 3, the first outer surface layer 1 is divided into an upper surface and a lower surface, the The intermediate layer 2 is divided into an upper surface and a lower surface, the second outer surface layer 3 is divided into an upper surface and a lower surface, the upper surface of the intermediate layer 2 is combined with the lower surface of the first outer surface layer 1, The lower surface of the intermediate layer 2 is combined with the upper surface of the second outer surface layer 3; the base materials of the first outer surface layer 1, the intermediate layer 2 and the second outer surface layer 3 are the same, and are characterized in that: The first outer surface layer 1, the middle layer 2 and the second outer surface layer 3 are all added with silicone particles, titanium dioxide particles, melamine formaldehyde resin and silica composite microspheres 4, the first outer surface layer 1 and the second outer surface layer 4. One or more of anti-UV agents and antistatic agents are added to layer 3, and the main components of melamine formaldehyde resin and silica composite microspheres 4 are melamine formaldehyde resin.

Further, the parts by weight of organosilicon particle, titanium dioxide particle, carbon dioxide particle and melamine formaldehyde resin and silica composite microsphere 4 in each layer of the first outer surface layer 1, intermediate layer 2 and second outer surface layer 3 are matched. The ratios are the same, respectively: 90%-95% optical grade polystyrene or PMMA particles, 1%-2% silicone particles, 1%-2% titanium dioxide particles, 1%-2% carbon dioxide particles, 1%-2% Melamine formaldehyde resin and silica composite microspheres 4.

Further, the refractive index of optical grade polystyrene is 1.51-1.52; the refractive index of silicone particles is 1.42-1.45, the refractive index of PMMA particles is 1.45-1.49, the refractive index of titanium dioxide particles is 1.42-1.45, and the refractive index of melamine formaldehyde resin is 1.42-1.45. The refractive index of the silica composite microspheres 4 is 1.6-1.7.

Further, the average particle size of the melamine formaldehyde resin and silica composite microspheres 4 is 1-20um, and the pore size should not be too large or too small. The silicon composite microspheres 4 are in contact.

Further, the first outer surface layer 1 and the second outer surface layer 3 contain one or more functional materials such as anti-UV and anti-static. Under normal circumstances, adding an anti-UV agent to the substrate can make the light diffusing plate have anti-UV effect, which increases the anti-yellowing effect of the product; adding an antistatic agent to the substrate can make the light diffusing plate have anti-static properties The function of making the product is not easy to be contaminated with dust.

Further, the first outer surface layer 1 and the second outer surface layer 3 contain an anti-UV agent, and the anti-UV agent contains benzoic acids, benzophenones, benzotriazoles, or partially hindered amines At least one of the classes, and uniformly dispersed in the first outer surface layer 1 and the second outer surface layer 3, wherein the anti-UV agent accounts for 3% of the total mass of the first outer surface layer 1 and the second outer surface layer 3～ 5%.

Further, the first outer surface layer 1 and the second outer surface layer 3 contain antistatic agents, and the antistatic agents include sulfuric acid derivatives, phosphoric acid derivatives, amines, quaternary ammonium salts, imidazoles and epoxy resins. At least one of the ethane derivatives is uniformly dispersed in the first outer surface layer 1 and the second outer surface layer 3, wherein the antistatic agent accounts for the total mass of the first outer surface layer 1 and the second outer surface layer 3. 2% to 6%.

The invention also discloses a method for synthesizing the multi-refractive index light diffusing plate, comprising the following steps:

(1) Step of preparing the base material: select optical grade polystyrene particles or PMMA particles as the base material;

(2) The steps of making melamine formaldehyde resin and silica composite microspheres 4: First, mix melamine and formaldehyde solution with a mass percentage concentration of 37%-40% in a mass ratio of 1:(2.4-6), and adjust the pH to be 8-10, stirring and reacting at a temperature of 60°C-65°C, and dissolving in an appropriate amount of distilled water to prepare a melamine-formaldehyde soluble prepolymer solution;

Secondly, the synthesized silica microspheres were surface-treated with 1% KH-570;

Finally, adding silica microspheres treated with KH-570 to the soluble prepolymer solution of melamine-formaldehyde, adjusting the solution to be acidic with a sulfuric acid compound, and centrifuging to obtain melamine formaldehyde resin and silica composite microspheres 4;

(3) Step of making optical masterbatch: Select from the prepared base material: select two feeding bins, respectively the first feeding bin and the second feeding bin, and the mass percentage added in the first feeding bin is 95% optical grade polymer The mixture of styrene, 1% silicone particles, 1% PMMA particles, 1% titanium dioxide particles, 1% carbon dioxide particles, 1% melamine formaldehyde resin and silica composite microspheres 4 and powder is uniformly stirred and mixed and then put into the first screw machine. In a pellet mill, melt it into a slurry;

In the second feeding bin, add mass percentage of 95% optical grade polystyrene, 1% silicone particles, 1% PMMA particles, 1% titanium dioxide particles, 1% carbon dioxide particles, 1% melamine formaldehyde resin and silica composite microparticles. The mixture of ball 4 and powder is put into the second screw granulator after uniform stirring and mixing, and it is melted into slurry;

The powder includes one or more of a diffusing agent, an anti-UV agent, an oxidizing agent, a light stabilizer and a lubricating dispersing agent;

(4) Extrusion molding steps:

The slurry melt extruded from the head of the first screw granulator is sent to the first outer surface layer 1 and the second outer surface layer 3 of the three-layer superimposed die through the distributor, and the second screw is granulated. The slurry-like melt extruded from the head of the machine is sent to the middle layer 2 of the three-layer superimposed die, and the extrusion rate of the first screw granulator and the second screw granulator and the distribution ratio of the distributor can be controlled at one time. Adjust the thickness of the first outer surface layer 1, the middle layer 2, the second outer surface layer 3 of the three-layer stacking die, and adjust the first outer surface layer 1 and the middle layer of the three-layer stacking die by adjusting the gap of the three-layer stacking die. 2. The thickness of the second outer surface layer 3, the first outer surface layer of the three-layer superimposed die head 1 The spit of the die head forms the first outer surface layer 1 of the diffusion plate, and the spit of the middle layer 2 die head forms the spit of the diffusion plate. The middle layer 2, the second outer surface layer 3 The spit from the die head forms the second outer surface of the diffuser plate, and the first outer surface, the middle layer 2 and the second outer surface of the diffuser plate are formed by three-roll rolling and cooling to form the diffuser plate finished product.

(5) Cooling and cutting steps:

After the three-roller rolling, the diffuser plate is conveyed forward through the conveyor belt, and is naturally cooled during the conveying process or cooled to room temperature by the cooling liquid, and then cut to the appropriate finished product size.

Further, in the step of making the optical masterbatch, the granulation temperature in the twin-screw granulator is between 160°C and 220°C, and the granulation pressure is between 4.5Mpa and 13.5Mpa.

Further, in the extrusion forming step, the plate forming temperature in the extrusion forming machine is between 170°C and 230°C, and the plate forming pressure is between 4.5Mpa and 13.5Mpa.

Compared with the prior art, the present invention proposes a multi-refractive index light diffusing plate and a method for synthesizing the same, which mainly comprises three layers, namely a first outer surface layer 1, a second outer surface layer 3 and an intermediate layer 2, The base material of the above-mentioned three-layer diffusion plate is the same, and the functional particles in the first outer surface layer 1 and the second outer surface layer 3 are the same, which are used to improve the special functions of the surface layer, such as anti-UV, anti- Static electricity, foaming and other functions; the innovation of the present invention is to add melamine formaldehyde resin and silicon dioxide with a mass percentage of 1%-2% in the first outer surface layer 1, the second outer surface layer 3 and the middle layer 2. Composite microspheres 4, the main components of melamine formaldehyde resin and silica composite microspheres 4 are melamine formaldehyde resin, the raw materials of melamine and formaldehyde are cheap and easy to obtain, and the reaction conditions of the two are mild and the reaction rate is relatively fast. The refractive index of resin and silica composite microspheres 4 is 1.6-1.7. By introducing a light diffusing agent with a high refractive index angle, the refraction angle of light is enriched, and the possibility of light passing through different materials is increased. By changing the direction of the light more, the light mixing effect is better when the light source passes through the light diffusion plate, and the light transmittance is greatly increased, which can meet most of the market needs and meet the needs and development of TFT-LCD products.

Description of drawings

FIG. 1 is a schematic structural diagram of a multi-refractive index light diffusing plate according to a specific embodiment.

Description of main components:

The following specific embodiments will further illustrate the present invention in conjunction with the above drawings.

Detailed ways

As shown in FIG. 1 , it is a schematic structural diagram of a multi-refractive index light diffusing plate.

Specific Example 1

A multi-refractive index light diffusing plate, comprising: a first outer surface layer 1, an intermediate layer 2, a second outer surface layer 3, the first outer surface layer 1 is divided into an upper surface and a lower surface, the The intermediate layer 2 is divided into an upper surface and a lower surface, the second outer surface layer 3 is divided into an upper surface and a lower surface, the upper surface of the intermediate layer 2 is combined with the lower surface of the first outer surface layer 1, The lower surface of the intermediate layer 2 is combined with the upper surface of the second outer surface layer 3; the base materials of the first outer surface layer 1, the intermediate layer 2 and the second outer surface layer 3 are the same, and are characterized in that: The first outer surface layer 1, the middle layer 2 and the second outer surface layer 3 are all added with silicone particles, titanium dioxide particles, melamine formaldehyde resin and silica composite microspheres 4, the first outer surface layer 1 and the second outer surface layer 4. One or more of anti-UV agents and antistatic agents are added to layer 3, and the main components of melamine formaldehyde resin and silica composite microspheres 4 are organic silicon.

The ratio of parts by weight of organosilicon particles, titanium dioxide particles, carbon dioxide particles and melamine formaldehyde resin and silica composite microspheres 4 in each layer of the first outer surface layer 1, the intermediate layer 2 and the second outer surface layer 3 The same, respectively: 90% ~ 95% optical grade polystyrene or PMMA particles, 1% ~ 2% silicone particles, 1% ~ 2% titanium dioxide particles, 1% ~ 2% carbon dioxide particles, 1% ~ 2% melamine Formaldehyde resin and silica composite microspheres 4.

The refractive index of the optical grade polystyrene is 1.51; the refractive index of the silicone particles is 1.42, the refractive index of the PMMA particles is 1.45, the refractive index of the titanium dioxide particles is 1.42, and the melamine formaldehyde resin and the silica composite microspheres 4 The refractive index is 1.6.

The average particle size of the melamine formaldehyde resin and silica composite microspheres 4 is 1-20um, and the pore size should not be too large or too small. By setting the pore size range, the light can be uniformly mixed with the melamine formaldehyde resin and silica. The composite microspheres 4 are in contact.

The first outer surface layer 1 and the second outer surface layer 3 contain one or more functional materials such as anti-UV and anti-static. Under normal circumstances, adding an anti-UV agent to the substrate can make the light diffusing plate have anti-UV effect, which increases the anti-yellowing effect of the product; adding an antistatic agent to the substrate can make the light diffusing plate have anti-static properties The function of making the product is not easy to be contaminated with dust.

The first outer surface layer 1 and the second outer surface layer 3 contain an anti-UV agent, and the anti-UV agent contains benzoic acids, benzophenones, benzotriazoles, or partially hindered amines At least one of them is uniformly dispersed in the first outer surface layer 1 and the second outer surface layer 3, wherein the anti-UV agent accounts for 3% to 5% of the total mass of the first outer surface layer 1 and the second outer surface layer 3. %.

The first outer surface layer 1 and the second outer surface layer 3 contain antistatic agents, and the antistatic agents include sulfuric acid derivatives, phosphoric acid derivatives, amines, quaternary ammonium salts, imidazoles and ethylene oxide. At least one of the alkane derivatives, and uniformly dispersed in the first outer surface layer 1 and the second outer surface layer 3, wherein the antistatic agent accounts for 2 of the total mass of the first outer surface layer 1 and the second outer surface layer 3 %～6%.

(4) Extrusion molding steps:

(5) Cooling and cutting steps:

In the step of making the optical master batch, the granulation temperature in the twin-screw granulator is between 160°C and 220°C, and the granulation pressure is between 4.5Mpa and 13.5Mpa.

In the extrusion forming step, the plate forming temperature in the extrusion forming machine is between 170°C and 230°C, and the plate forming pressure is between 4.5Mpa and 13.5Mpa.

Specific embodiment 2

Optical grade polystyrene, organosilicon particles, PMMA particles, titanium dioxide particles, carbon dioxide particles and melamine formaldehyde resin and silicon dioxide composite in each layer of the first outer surface layer 1, the intermediate layer 2 and the second outer surface layer 3 The proportions by weight of the microspheres 4 are the same, respectively: 90% optical grade polystyrene, 2% silicone particles, 1% to 2% PMMA particles, 2% titanium dioxide particles, 2% carbon dioxide particles, 2% melamine formaldehyde Resin and silica composite microspheres 4.

Further, the refractive index of optical grade polystyrene is 1.52; the refractive index of silicone particles is 1.45, the refractive index of PMMA particles is 1.49, the refractive index of titanium dioxide particles is 1.45, and the melamine formaldehyde resin and silica composite microspheres4 The index of refraction is 1.7.

(4) Extrusion molding steps:

(5) Cooling and cutting steps:

Compared with the prior art, the high haze, high transmittance light diffusing plate of the present invention uses simple materials, which are relatively easy to obtain raw materials, and the amount used is relatively small, so the raw material cost is relatively low. In addition, since the refractive index of the silicone melamine formaldehyde resin and the silica composite microsphere 4 in the intermediate layer 2 in the present invention is 1.7, the refractive index of the optical grade polystyrene is 1.52, and the refractive index of the optical grade polystyrene is 1.52. The refractive index of silicone particles is 1.45, the refractive index of PMMA particles is 1.49, and the refractive index of titanium dioxide particles is 1.45. By introducing a light diffusing agent with a low refractive index angle, the refraction angle of light is enriched and the light passing through is increased. The possibility of refraction angles of different materials, more changes in the direction of light, makes the light mixing effect better when the light source passes through the light diffuser, and the light transmittance is greatly increased, which can meet most market needs and conform to TFT-LCD products. needs and development.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

A multi-refractive index light diffusing plate, comprising: a first outer surface layer (1), an intermediate layer (2), and a second outer surface layer (3), wherein the first outer surface layer (1) is divided into Upper surface and lower surface, described intermediate layer (2) is divided into upper surface and lower surface, described second outer surface layer (3) is divided into upper surface and lower surface, described intermediate layer (2) The upper surface is combined with the lower surface of the first outer surface layer (1), the lower surface of the intermediate layer (2) is combined with the upper surface of the second outer surface layer (3); the first outer surface layer ( 1), the base material of the intermediate layer (2) and the second outer surface layer (3) is the same, and it is characterized in that: the first outer surface layer (1), the intermediate layer (2) and the second outer surface layer (3) are all Silicone particles, titanium dioxide particles, melamine formaldehyde resin and silica composite microspheres (4) are added, and anti-UV agents and antistatic agents are added to the first outer surface layer (1) and the second outer surface layer (3). One or more of the melamine formaldehyde resin and silica composite microspheres (4) are mainly composed of melamine formaldehyde resin.
The multi-refractive index light diffusing plate according to claim 1, characterized in that: the organic silicon particles in each layer of the first outer surface layer (1), the intermediate layer (2) and the second outer surface layer (3), Titanium dioxide particles, carbon dioxide particles, melamine formaldehyde resin and silica composite microspheres (4) have the same proportions by weight, which are: 90% to 95% of optical grade polystyrene or PMMA particles, 1% to 2% of organic Silicon particles, 1% to 2% of titanium dioxide particles, 1% to 2% of carbon dioxide particles, 1% to 2% of melamine formaldehyde resin and silica composite microspheres (4).
The multi-refractive index light diffusing plate according to claim 1, wherein the refractive index of optical grade polystyrene is 1.51-1.52; the refractive index of organic silicon particles is 1.42-1.45, and the refractive index of PMMA particles is 1.45 -1.49, the refractive index of the titanium dioxide particles is 1.42-1.45, and the refractive index of the melamine formaldehyde resin and silica composite microspheres (4) is 1.6-1.7.
The multi-refractive index light diffusing plate according to claim 1, wherein the average particle size of the melamine formaldehyde resin and silica composite microspheres (4) is 1-20um.
The multi-refractive index light diffusing plate according to claim 1, characterized in that: the first outer surface layer (1) and the second outer surface layer (3) contain one of the functional materials such as anti-UV and anti-static. one or more.
The multi-refractive index light diffusing plate according to claim 1, wherein the first outer surface layer (1) and the second outer surface layer (3) contain an anti-UV agent, and the anti-UV agent is a At least one of benzoic acids, benzophenones, benzotriazoles, or partially hindered amines, and uniformly dispersed in the first outer surface layer (1) and the second outer surface layer (3), The anti-UV agent accounts for 3% to 5% of the total mass of the first outer surface layer (1) and the second outer surface layer (3).
The multi-refractive index light diffusing plate according to claim 1, characterized in that: the first outer surface layer (1) and the second outer surface layer (3) contain an antistatic agent, and the antistatic agent is composed of At least one of sulfuric acid derivatives, phosphoric acid derivatives, amines, quaternary ammonium salts, imidazoles and ethylene oxide derivatives, and uniformly dispersed in the first outer surface layer (1) and the second outer surface layer (3 ), wherein the antistatic agent accounts for 2% to 6% of the total mass of the first outer surface layer (1) and the second outer surface layer (3).
The method for synthesizing a multi-refractive index light diffusing plate as claimed in claim 1, comprising the steps of:

(1) Step of preparing the base material: select optical grade polystyrene particles or PMMA particles as the base material;

(2) The steps of making melamine formaldehyde resin and silica composite microspheres (4): First, mix melamine and formaldehyde solution with a mass percentage concentration of 37%-40% in a mass ratio of 1:(2.4-6), adjust The pH is 8-10, and the reaction is stirred at a temperature of 60°C-65°C, and dissolved in an appropriate amount of distilled water to prepare a melamine-formaldehyde soluble prepolymer solution;

Secondly, the synthesized silica microspheres were surface-treated with 1% KH-570;

Finally, add silica microspheres treated with KH-570 in the soluble prepolymer solution of melamine-formaldehyde, adjust the solution to be acidic with a sulfuric acid compound, and centrifugally dry to obtain melamine formaldehyde resin and silica composite microspheres (4 );

(3) Step of making optical masterbatch: Select from the prepared base material: select two feeding bins, respectively the first feeding bin and the second feeding bin, and the mass percentage added in the first feeding bin is 95% optical grade polymer The mixture of styrene, 1% silicone particles, 1% PMMA particles, 1% titanium dioxide particles, 1% carbon dioxide particles, 1% melamine formaldehyde resin and silica composite microspheres (4) and powder is uniformly stirred and mixed and then put into the first In the screw granulator, melt it into a slurry;

In the second feeding bin, add mass percentage of 95% optical grade polystyrene, 1% silicone particles, 1% PMMA particles, 1% titanium dioxide particles, 1% carbon dioxide particles, 1% melamine formaldehyde resin and silica composite microparticles. The mixture of the ball (4) and the powder is uniformly stirred and mixed into the second screw granulator, and it is melted into a slurry; the powder includes a diffusing agent, an anti-UV agent, an oxidizing agent, a light stabilizer and a lubricating and dispersing agent. one or more;

(4) Extrusion molding steps:

The slurry-like melt extruded from the head of the first screw granulator is conveyed to the first outer surface layer (1) and the second outer surface layer (3) of the three-layer superimposed die through the distributor, respectively. The slurry-like melt extruded from the head of the two-screw granulator is delivered to the middle layer (2) of the three-layer superimposed die, by controlling the extrusion rate and distribution of the first and second screw granulators. The distribution ratio of the three-layer superimposed die can be adjusted once to adjust the thickness of the first outer surface layer (1), the middle layer (2), and the second outer surface layer (3) of the three-layer superimposed die. The thickness of the first outer surface layer (1), the intermediate layer (2), and the second outer surface layer (3) of the superimposed die is layered, and the first outer surface layer (1) of the three-layer superimposed die is spit out of the die to form a diffuser plate The first outer surface layer (1) of the first outer surface layer (1), the middle layer (2) The spit of the die forms the middle layer (2) of the diffuser plate, and the second outer surface layer (3) The spit of the die head forms the second outer layer of the diffuser plate. Surface, the first outer surface, the intermediate layer (2) and the second outer surface of the diffuser plate are formed by three-roll rolling cooling to form a finished diffuser plate.

(5) Cooling and cutting steps:

After the three-roller rolling, the diffuser plate is conveyed forward through the conveyor belt, and is naturally cooled during the conveying process or cooled to room temperature by the cooling liquid, and then cut to the appropriate finished product size.