CN111267378A

CN111267378A - Ultra-wide bidirectional stretching diffusion plate and preparation method thereof, liquid crystal display and flat-panel LED lighting lamp

Info

Publication number: CN111267378A
Application number: CN202010123309.5A
Authority: CN
Inventors: 徐月宏; 魏明吉; 邹若东
Original assignee: Tianjin Rentai New Material Co Ltd
Current assignee: Tianjin Rentai New Material Co Ltd
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-06-12
Anticipated expiration: 2040-02-27
Also published as: CN111267378B

Abstract

The application relates to the technical field of multimedia display and illumination application, in particular to an ultra-wide bidirectional stretching diffusion plate and a preparation method thereof, a liquid crystal display and a flat-panel LED illumination lamp. By controlling the melt index of the plastic melt to be 1.1-3.7 g/10min, the stretching temperature to be 105-150 ℃ and the stretching ratio to be 1.3-4.0, the melt index, the stretching temperature and the stretching ratio are matched with each other, so that the ultra-wide diffusion plate is obtained, the width can reach 4m, and the thickness can be kept between 100-3000 mu m. The stretching temperature of longitudinal stretching and transverse stretching of the diffusion plate is controlled within the range, so that the diffusion plate base material is in a glass transition temperature boundary operation area, and meanwhile, the stretching magnification is controlled within the range and can be matched with the glass transition temperature, so that the diffusion plate is ensured to stretch materials within the glass transition temperature range, and the stretching strength of the diffusion plate is improved.

Description

Ultra-wide bidirectional stretching diffusion plate and preparation method thereof, liquid crystal display and flat-panel LED lighting lamp

Technical Field

The application relates to the technical field of multimedia display and illumination application, in particular to an ultra-wide bidirectional stretching diffusion plate and a preparation method thereof, a liquid crystal display and a flat-panel LED illumination lamp.

Background

With the rapid development of multimedia display technology and energy-saving illumination technology, displays and illumination devices with more environmental protection, energy saving, lighter and thinner size, clearer image quality, higher space utilization rate and larger size are becoming the mainstream of the market, especially the most typical of liquid crystal displays and flat panel LED illumination. Since the liquid crystal of such a liquid crystal display device does not have a light emitting characteristic, a light source device called a backlight unit needs to be provided on the back side of the liquid crystal device. The backlight assembly uniformly scatters light from the light source to the liquid crystal device via the diffusion plate and the diffusion sheet, so that the liquid crystal display can display various high-definition images and realize multimedia display function. The currently mainstream LED lighting lamp in the lighting application field is in a side-entrance type and a direct-down type, both the two types of lamps use a diffusion plate to realize the uniformity and softness of light rays of the lamp, and the LED lighting lamp is an important optical component of the LED lighting lamp.

At present, the mainstream diffusion plate is limited by the manufacturing technology of a rolling roller and an injection mold of production equipment, the thickness is mainly controlled to be 1.2-3mm, and the width is controlled to be 0.8-1.5 m. Such a thick and wide diffuser plate cannot be adapted to the concept of visually pursuing thinner, lighter, and more aesthetically pleasing multimedia displays and lighting, limiting the development of downstream products.

The current ultra-wide diffusion plate is difficult to manufacture. The thickness is controlled below 1000 microns and even thinner, and the production technology of the ultra-wide thin diffusion plate with the width reaching 4m is blank.

Disclosure of Invention

The application aims to provide an ultra-wide bidirectional stretching diffusion plate, a preparation method thereof, a liquid crystal display and a flat-panel LED lighting lamp.

In a first aspect, the application provides a method for preparing an ultra-wide bidirectional stretching diffuser plate, which can be applied to the preparation of an ultra-wide diffuser plate with a width of 0.8-4 m and a thickness of 100-3000 μm, and the method comprises the following steps:

continuously extruding the plastic melt to form a continuous flaky plastic stream, and calendering the plastic stream to obtain a first diffusion plate; wherein the melt index of the plastic melt is controlled within the range of 1.1g/10 min-3.7 g/10 min;

performing primary stretching and secondary stretching on the first diffusion plate; the stretching temperature of the first stretching and the stretching temperature of the second stretching are both controlled within 105-150 ℃, and the stretching multiplying power is both controlled within 1.3-4.0; the first stretching is carried out along the longitudinal direction of the first diffusion plate, and the second stretching is carried out along the transverse direction of the first diffusion plate; or the first stretching is carried out along the transverse direction of the first diffusion plate, and the second stretching is carried out along the longitudinal direction of the first diffusion plate.

The method controls the melt index of the plastic melt to be within the range of 1.1g/10 min-3.7 g/10min, the stretching temperature to be within the range of 105-150 ℃, and the stretching ratio to be within the range of 1.3-4.0, so that the melt index, the stretching temperature and the stretching ratio are matched with each other, and the diffusion plate with super-wide width can be obtained, the width can reach 4 meters, and the thickness can be kept between 100-3000 mu m. The stretching temperature of longitudinal stretching and transverse stretching of the diffusion plate is controlled within the range, so that the diffusion plate base material is in a glass transition temperature boundary operation area, and meanwhile, the stretching magnification is controlled within the range and can be matched with the glass transition temperature, so that the diffusion plate is ensured to stretch materials within the glass transition temperature range, and the stretching strength of the diffusion plate is improved.

In a second aspect, the application provides an ultra-wide biaxially oriented diffuser plate, which is manufactured by the above method.

The width of the ultra-wide bidirectional stretching diffusion plate can reach 4 meters, the thickness can be kept between 100 and 3000 micrometers, and the tensile strength is high and can reach 40 to 65 MPa. The ultra-wide bidirectional stretching diffusion plate is thinner and lighter, can save material cost, saves product volume and space, is suitable for the multimedia display and illumination idea of pursuing thinner, lighter and more beautiful visually, and can promote the development of downstream products.

In a third aspect, the present application provides an ultra-wide biaxially oriented diffuser plate, wherein the melt index of the ultra-wide biaxially oriented diffuser plate is in a range of 1.1g/10min to 3.7g/10 min;

the width of the ultra-wide bidirectional stretching diffusion plate is 2-4 m, and the thickness is 100-3000 mu m;

the tensile strength of the ultra-wide biaxial stretching diffusion plate is 50-65 MPa.

The ultra-wide biaxial stretching diffusion plate has the advantages that the melt index and the plate thickness are matched, the ultra-wide width is realized, the tensile strength is high, and the application range is wide.

In a fourth aspect, the present application provides a liquid crystal display, which includes a diffuser plate manufactured by the method for manufacturing a super-wide biaxially oriented diffuser plate; or

The liquid crystal display comprises the ultra-wide biaxial stretching diffusion plate.

Such liquid crystal displays are thinner, lighter, and more aesthetically pleasing.

In a fifth aspect, the present application provides a flat LED lighting fixture, which includes a diffuser plate manufactured by the above method for manufacturing an ultra-wide biaxially-oriented diffuser plate; or

The flat-panel LED lighting lamp comprises the ultra-wide bidirectional stretching diffusion plate. The flat-panel LED illuminating lamp is thinner, lighter and more attractive.

Drawings

In order to more clearly explain the technical solutions of the embodiments of the present application, 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 application and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a process diagram of transverse stretching and longitudinal stretching of an ultra-wide biaxial stretching diffuser plate provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a calendering biaxial stretching molding system provided in an embodiment of the present application;

fig. 3 is a first plate structure of an ultra-wide biaxial stretching diffuser plate according to an embodiment of the present disclosure;

fig. 4 is a second plate structure of an ultra-wide biaxial stretching diffuser plate according to an embodiment of the present application;

fig. 5 is a third plate surface structure of an ultra-wide biaxial stretching diffuser plate according to an embodiment of the present application;

fig. 6 is a fourth plate surface structure of an ultra-wide biaxial stretching diffuser plate according to an embodiment of the present disclosure;

fig. 7 is a fifth plate structure of an ultra-wide biaxial stretching diffuser plate according to an embodiment of the present application;

fig. 8 is a sixth plate structure of an ultra-wide biaxial stretching diffuser plate according to an embodiment of the present application;

fig. 9 is a seventh plate structure of an ultra-wide biaxial stretching diffuser plate according to an embodiment of the present application;

fig. 10 is an eighth plate surface structure of an ultra-wide biaxial stretching diffuser plate according to an embodiment of the present application;

fig. 11 is a ninth plate structure of an ultra-wide biaxial stretching diffuser plate according to an embodiment of the present application.

Icon: 100-calendering biaxial stretching molding system; 110-solvent tank; 111-raw material tank; 112-a mixing trough; 113-a reaction kettle; 114-gear pump; 115-a devolatilizer; 116-gear pump; 117-a condenser; 118-a recovery tank; 119-a mixer; 120-a filter; 122-a vacuum system; 123-an extrusion die; 124-calendering rolls; 125-longitudinal stretcher; 126-transverse stretching machine; 127-a cutting machine; 20-a striped frosted combined diffuser plate; 21-stripe V-groove combined diffusion plate; a 22-V groove frosted combination diffusion plate; 30-V groove combined diffusion plate; 31-frosted combination diffusion plate; 32-dot frosted combination diffusion plate; 40-dot V-groove combined diffusion plate; 41-dot stripe combined diffusion plate; 42-stripe combination diffuser plate.

Detailed Description

The diffuser plate is required to be transversely stretched to prepare an ultra-wide diffuser plate, but it is difficult to transversely stretch the thickness of the diffuser plate to 1000 μm or less. Meanwhile, transverse stretching and longitudinal stretching are adopted, and the difficulty is that the thickness of the diffusion plate is difficult to control, the conditions of over-thinness, poor stretching effect, poor appearance forming quality of the plate, plate breakage, equipment damage, production line shutdown and the like easily occur.

In order to prepare an ultra-wide diffuser plate and ensure high tensile strength, the embodiment of the application provides a preparation method of the ultra-wide diffuser plate, which is applicable to the ultra-wide diffuser plate with the width of 0.8-4 m and the thickness of 100-3000 μm, and comprises the following steps:

The inventors have found that a diffuser plate having an ultra-wide width and a high tensile strength can be obtained by controlling the melt index, thickness, stretching temperature, and stretching ratio of the diffuser plate base material to match each other. The method comprises the steps of controlling the melt index of a plastic melt within the range of 1.1g/10 min-3.7 g/10min, then carrying out longitudinal stretching and transverse stretching (namely width and thickness bidirectional stretching) after the plastic melt is rolled, and simultaneously controlling the stretching temperature and the stretching ratio in the longitudinal stretching and transverse stretching processes to enable the melt index, the stretching temperature and the stretching ratio to be matched and cooperated with each other, so that the ultra-wide diffusion plate is obtained, the width can reach 4m, and the thickness can be kept between 100 and 3000 mu m. The stretching temperature of longitudinal stretching and transverse stretching of the diffusion plate is controlled within the range, so that the diffusion plate base material is in a glass transition temperature boundary operation area, and meanwhile, the stretching magnification is controlled within the range and can be matched with the glass transition temperature, so that the diffusion plate is ensured to stretch materials within the glass transition temperature range, and the stretching strength of the diffusion plate is improved. The material is stretched during the elastic plastic deformation at the glass transition temperature interval, so that the macromolecular structures in the material are arranged more orderly, the acting force among the molecules of the material is larger, the tensile strength of the material is improved, and the tensile strength of the diffusion plate is further improved.

In some embodiments of the present application, the first stretching is stretching in a longitudinal direction of the diffuser plate and the second stretching is stretching in a transverse direction of the diffuser plate. The preparation method of the ultra-wide bidirectional stretching diffusion plate comprises the following steps:

step 1, preparing a plastic melt body with uniformly distributed diffusion powder (diffusion particles).

The plastic melt is prepared by uniformly mixing a thermoplastic plastic material and diffusion powder and carrying out polymerization reaction.

The uniformity of the plastic melt can be improved by uniformly mixing the thermoplastic plastic material and the diffusion powder and carrying out polymerization reaction to prepare the plastic melt. Therefore, the technical problems that the mixing, melting and plasticizing of the diffusion powder and the plastic particles are not uniform, carbonization occurs and external impurities are brought in, the diffusion plate has rigid material crystal points and yellowing of the external impurities, and the light scattering effect is poor due to the fact that the diffusion powder and the plastic particles are subjected to physical mixing, melting and plasticizing, extrusion and calendaring plate manufacturing in the traditional production process can be solved.

Optionally, the thermoplastic material comprises at least one of styrene, methyl methacrylate or a cyclic olefin.

Specifically, one or a combination of several of the reaction raw materials of thermoplastic plastics such as styrene monomer, methyl methacrylate, cyclic olefin or styrene monomer and the like and diffusion powder (diffusion particles) are added into a reaction kettle and uniformly mixed to carry out polymerization reaction.

Further, the polymerization temperature is 110 to 160 ℃, and further preferably 120 to 140 ℃.

The melt index of the plastic melt obtained by the steps can be controlled within the range of 1.1g/10 min-3.7 g/10 min. Further alternatively, the melt index of the plastic melt can be controlled in the range of 1.6g/10min to 3.0g/10 min. Illustratively, the melt index of the plastic melt is 1.7g/10min, 1.8g/10min, 1.9g/10min, 2.0g/10min, 2.2g/10min, 2.5g/10min, or 2.8g/10 min.

By controlling the melt index of the plastic melt during extrusion within the above range, a powerful guarantee can be provided for obtaining a diffuser plate with an ultra-wide width and a thin thickness for subsequent stretching.

In alternative embodiments of the present application, other raw materials and processes may be used to achieve a melt index within the above-described ranges.

Further, the diffusion powder (diffusion particles) described above includes at least one of silicon dioxide, titanium dioxide, barium sulfate, or magnesium fluoride.

Further, the particle size of the diffusion powder is 2 to 20 μm, and more preferably 8 to 15 μm.

Further, the mass ratio of the diffusion powder to the thermoplastic plastic material is (0.1-25): 100, further optionally (0.6-6): 100.

illustratively, the mass ratio of diffusing powder to thermoplastic material is 0.7: 100, respectively; or the mass ratio of the diffusion powder to the thermoplastic plastic material is 1: 100, respectively; or the mass ratio of the diffusion powder to the thermoplastic plastic material is 2: 100, respectively; or the mass ratio of the diffusion powder to the thermoplastic plastic material is 5: 100.

further, after the polymerization reaction, the plastic melt was subjected to devolatilization and filtration purification.

Further, the devolatilization temperature is 240-280 ℃, and the pressure is 0.01-3 kpa (a); further, it is preferably 250 to 270 ℃ and a pressure of 0.01 to 2kpa (a).

Illustratively, the devolatilization temperature is 250 ℃ and the pressure is 0.5kpa (a); alternatively, the devolatilization temperature is 260 ℃ and the pressure is 1kpa (a).

Specifically, materials generated by polymerization reaction are conveyed to a devolatilization unit through a pipeline by a melt conveying pump, devolatilization and filtering refining are carried out on the plastic melt which is generated by the reaction and is uniformly distributed with diffusion powder and diffusion particles in the devolatilization unit, unreacted raw material monomers are separated out, and the plastic melt which is subjected to devolatilization, filtering and refining is used as the raw material of the back-stage diffusion plate.

And 2, continuously extruding the plastic melt which is uniformly distributed with the diffusion powder (diffusion particles) and is prepared in the step 1 to form a continuous flaky plastic stream, and calendering the plastic stream to obtain the first diffusion plate.

Further, continuously extruding the plastic melt, and controlling the temperature within the range of 180-250 ℃; further optionally, the temperature is controlled within the range of 190-240 ℃; further optionally, the temperature is controlled within the range of 200-230 ℃.

Furthermore, the extrusion pressure is controlled within the range of 2-25 MPa. Further optionally, the extrusion pressure is controlled within the range of 5-20 MPa. Further optionally, the extrusion pressure is controlled within the range of 10-18 MPa.

In some specific embodiments of the present application, the first diffusion plate is obtained by conveying the plastic melt with uniformly distributed diffusion powder (diffusion particles) generated in step 1 to a calendering roller through a melt transfer pump, and calendering.

It should be noted that the first diffuser plate obtained in the above steps is thick and narrow in width, and then the diffuser plate with super-wide width and thin thickness is obtained by longitudinal stretching and transverse stretching.

And 3, longitudinally stretching the first diffusion plate, and then transversely stretching the first diffusion plate.

Further, referring to fig. 1, the first drawing (longitudinal drawing) step includes: preheating, stretching and shaping. The second stretching (transverse stretching) step includes: preheating, stretching, shaping and cooling.

Furthermore, the temperature of longitudinal stretching and the temperature of transverse stretching are both controlled within 105-150 ℃, and the stretching ratio is both controlled within 1.3-4.0.

The temperature of longitudinal stretching and the temperature of transverse stretching are controlled within the range of 105-150 ℃, the stretching multiplying power is controlled within the range of 1.3-4.0 times, and the temperature can be matched with the melt index (1.1g/10 min-3.7 g/10min) of the plastic melt, so that the ultra-wide diffuser plate with the width of 4 meters and the thickness of 100-3000 mu m can be obtained.

Furthermore, the temperature of longitudinal stretching and the temperature of transverse stretching are both controlled within the range of 110-150 ℃, and the stretching ratio is both controlled within the range of 1.5-4.0. Further optionally, the temperature of longitudinal stretching and the temperature of transverse stretching are both controlled within the range of 120-150 ℃, and the stretching ratio is both controlled within the range of 2.0-4.0. Further optionally, the temperature of longitudinal stretching and the temperature of transverse stretching are both controlled within the range of 140-150 ℃, and the stretching ratio is both controlled within the range of 2.0-4.0.

Illustratively, the longitudinal stretching temperature is 142 ℃ and the stretching ratio is 2.0; the transverse stretching temperature is 145 ℃, and the stretching ratio is 3.0; or the longitudinal stretching temperature is 146 ℃, and the stretching ratio is 2.5; the transverse stretching temperature was 147 ℃ and the stretching ratio was 3.2.

The stretching temperature of longitudinal stretching and transverse stretching of the diffusion plate is controlled within the range, so that the diffusion plate base material is in a glass transition temperature boundary operation area, and meanwhile, the stretching magnification is controlled within the range and can be matched with the glass transition temperature, so that the diffusion plate is ensured to stretch materials within a glass transition temperature range, and the diffusion plate with ultra-wide width and the thickness of 100-3000 micrometers can be obtained. More importantly, due to the fact that the material is subjected to bidirectional stretching during elastic plastic deformation, the arrangement of macromolecular structures in the material is more orderly, acting force among molecules of the material is larger, and therefore the tensile strength of the material is improved, and further the tensile strength of the diffusion plate is improved.

The ultra-wide diffuser plate manufactured by the embodiment of the application has the tensile strength of 40-65 MPa, and preferably 50-65 MPa. Compared with the traditional diffusion plate (tensile strength is 40-50 Mpa) in the prior art, the tensile strength is greatly improved.

Further, the preheating step of the first drawing (longitudinal drawing): the preheating temperature is controlled within the range of 105-180 ℃. Further optionally, the preheating temperature is 110-170 ℃; further optionally, the preheating temperature is 120 ℃ to 160 ℃. Illustratively, the preheating temperature is 125 ℃, 130 ℃, 135 ℃, 140 ℃, 145 ℃ or 150 ℃.

Further, a first stretching (longitudinal stretching) setting process: the setting temperature is controlled within the range of 100-150 ℃. Further optionally, the setting temperature is 105-145 ℃; further optionally, the setting temperature is 110-140 ℃. Exemplary setting temperatures are 115 ℃, 120 ℃, 125 ℃, 130 ℃ or 135 ℃.

Further, the preheating step of the second stretching (transverse stretching): the preheating temperature is controlled within the range of 100-150 ℃. Further optionally, the preheating temperature is 105-145 ℃; further optionally, the preheating temperature is 110 ℃ to 140 ℃. Exemplary preheating temperatures are 115 ℃, 120 ℃, 125 ℃, 130 ℃ or 135 ℃.

Further, a setting step of the second stretching (transverse stretching): the setting temperature is controlled within the range of 90-140 ℃. Further optionally, the setting temperature is 95-135 ℃; further optionally, the setting temperature is 100-130 ℃. Illustratively, the setting temperature is 105 ℃, 110 ℃, 115 ℃, 120 ℃ or 125 ℃.

Further, the cooling step of the second stretching (transverse stretching): the cooling temperature is controlled within the range of 40-120 ℃. Further optionally, cooling to a temperature of 45 ℃ to 115 ℃; further optionally, the cooling temperature is 50 ℃ to 110 ℃. Illustratively, the cooling temperature is 55 ℃, 60 ℃, 65 ℃, 80 ℃, 90 ℃ or 100 ℃.

Further, after the first diffusion plate is longitudinally stretched and transversely stretched, the manufactured ultra-wide diffusion plate is dried.

Further, the drying temperature is 85-125 ℃. Further optionally, the drying temperature is 90-120 ℃; further optionally, the drying temperature is 95-110 ℃.

In some embodiments of the present application, referring to fig. 2, the calendering biaxial stretching molding system 100 shown in the figure is used to prepare the ultra-wide biaxial stretching diffuser plate, which specifically includes:

the thermoplastic material in the material tank 111 is pumped into the reaction vessel 113. The solvent in the solvent tank 110 is thrown into a material mixing tank 112, the diffusion powder (diffusion particles) is added into the material mixing tank 112, the diffusion powder and the solvent are uniformly mixed and then are thrown into a reaction kettle 113 through a pump, and the mixture and the raw material of the thermoplastic plastic in the reaction kettle 113 are subjected to micro negative pressure polymerization reaction to generate the plastic melt body with the uniformly distributed diffusion powder. The generated plastic melt with uniformly distributed diffusion powder is conveyed to a devolatilization device 115 through a gear pump 116, unreacted raw materials are separated out in the devolatilization device 115 through high vacuum heating, and separated raw material gas phase enters a recovery tank 118 after being cooled through a condenser 117 to become a circulating solvent. The recycled solvent is pumped into the solvent tank 110 for recycling, wherein the vacuum pressure of the reaction system is provided by the vacuum system 122. The plastic melt with the uniformly distributed diffusion powder after the unreacted raw materials are separated by the devolatilization device 115 is sequentially conveyed to the mixer 119 and the filter 120 by the gear pump 114, the plastic melt with the uniformly distributed diffusion powder enters the extrusion die head 123 after passing through the filter 120, and the plastic melt with the uniformly distributed diffusion powder forms a wide sheet-shaped melt under the action of the extrusion die head 123 and reaches the calendering roller 124 for calendering. After being rolled by the rolling roller 124, the wide sheet-shaped fused mass forms a first diffusion plate with a thicker thickness and a microstructure on the surface, and the first diffusion plate with the thicker thickness and the microstructure sequentially passes through the longitudinal stretcher 125 and the transverse stretcher 126 to form an ultra-wide diffusion plate with a thickness meeting the requirement. Then coating and drying the film by a thin plate. Finally, the diffusion plates are cut into a certain size and shape by a cutting machine 127, and the qualified cut diffusion plates are packaged.

In other alternative embodiments of the present application, the first stretching may be performed in the transverse direction, and the second stretching may be performed in the longitudinal direction, and the process parameters are the same as those of the previous embodiments.

Some embodiments of the application further provide an ultra-wide biaxially oriented diffuser plate, which is prepared by using the preparation method of the ultra-wide biaxially oriented diffuser plate provided by the foregoing embodiments.

Furthermore, the thickness of the ultra-wide biaxial stretching diffusion plate is 100-3000 μm, preferably 500, 800, 1000, 1500, 2000, 3000 μm. The width of the diffuser plate is 0.8m-4m, preferably 1.0m, 1.5m, 2m, 2.5m, 3m, 3.5m, 4 m.

Some embodiments of the present application also provide an ultra-wide biaxially oriented diffuser plate having a melt index in a range of 1.1g/10min to 3.7g/10 min.

Furthermore, the width of the ultra-wide bidirectional stretching diffusion plate is 0.8-4 m, and the thickness of the ultra-wide bidirectional stretching diffusion plate is 100-3000 microns.

Further optionally, the width of the ultra-wide bidirectional stretching diffusion plate is 1-4 m; the thickness is 500 to 3000 μm. Further optionally, the width and the width of the ultra-wide bidirectional stretching diffusion plate are 2-4 m.

Further optionally, the ultra-wide biaxial tension diffuser plate has a tensile strength of 40-65 MPa, optionally 50-65 MPa.

Further optionally, the light transmittance of the ultra-wide bidirectional stretching diffusion plate is 40-80%, and further optionally 50-70%.

Further optionally, the super-wide biaxial stretching diffuser plate has a haze of 80-99%.

Further, the structural characteristics of the diffuser plate surface comprise one or more of frosting lines, continuous/discontinuous arc-shaped lines, regularly/irregularly distributed point lines and continuous/discontinuous V-shaped grooves. Alternatively, these microstructures are obtained by calendering.

The microstructures can play a role of the microlenses, so that light rays are refracted by the lenses to control the light-emitting angles of the light rays, the light rays emitted in the original horizontal direction are refracted and concentrated to be emitted in the vertical direction, the light rays in a non-field-of-view area are reduced, the emitted light rays in the vertical front-view direction are increased, the transmittance of the light rays penetrating through the microstructure diffusion plate is increased, and the brightness is further improved.

The diffusion plate is applied to multimedia display, and the display effect can be improved.

Fig. 3 to 11 show examples of diffuser plates with different plate surface structures. The method comprises the following steps: stripe frosted combination diffusion plate 20, stripe V-groove combination diffusion plate 21, V-groove frosted combination diffusion plate 22, V-groove combination diffusion plate 30, frosted combination diffusion plate 31, dot frosted combination diffusion plate 32, dot V-groove combination diffusion plate 40, dot stripe combination diffusion plate 41 and stripe combination diffusion plate 42.

Some embodiments of the present application further provide a liquid crystal display, where the liquid crystal display includes a diffuser plate manufactured by the method for manufacturing an ultra-wide biaxially oriented diffuser plate provided in the foregoing embodiments; or

The liquid crystal display comprises the ultra-wide biaxial stretching diffusion plate provided by the embodiment.

Some embodiments of the present application further provide a flat LED lighting fixture, where the flat LED lighting fixture includes a diffuser plate manufactured by the method for manufacturing an ultra-wide biaxially oriented diffuser plate provided in the foregoing embodiments; or

The flat-panel LED lighting fixture comprises the ultra-wide bidirectional stretching diffusion plate provided by the embodiment.

The flat-panel LED illuminating lamp is thinner, lighter and more attractive.

The features and properties of the present application will be described in detail below with reference to examples and comparative examples.

Example 1

The raw material of thermoplastic plastics in the raw material groove 111, styrene monomer is pumped into a reaction kettle 113 through a pump and solvent circulating liquid in a solvent groove 110 is pumped into a material mixing groove 112, diffusion powder is added into the material mixing groove 112 to enable the diffusion powder and the solvent to be uniformly mixed, then the mixture is pumped into the reaction kettle 113 through the pump, the polymerization temperature is maintained at 150 ℃ and the pressure is 80kpa (a) in the reaction kettle 113, plastic melt with the diffusion powder uniformly distributed is generated through polymerization reaction, the generated plastic melt with the diffusion powder uniformly distributed is conveyed to a devolatilization device 115 through a gear pump 114, the material is heated to 260 ℃, the high vacuum degree is 3kpa (a), unreacted raw material styrene and circulating liquid are separated, the separated raw material gas phase is cooled through a condenser 117 and then enters a recovery tank 118 to be called as circulating solvent, and the circulating solvent is pumped into the solvent groove 110 for recycling. Wherein the vacuum pressure of the reaction system is provided by a vacuum system 122. The plastic melt with uniformly distributed diffusion powder, from which unreacted raw material styrene and circulating liquid are separated by a devolatilizer 115, is sequentially conveyed to a mixer 119 and a filter 120 by a gear pump 116, the plastic melt with uniformly distributed diffusion powder enters an extrusion die head 123 after passing through the filter 120, the temperature of the extrusion die head is maintained at 240 ℃, the extrusion pressure is 15MPa, the plastic melt with uniformly distributed diffusion powder forms a wide-width sheet-shaped melt, the wide-width sheet-shaped melt forms a thick diffusion plate with a frosted microstructure on the surface, the thick diffusion plate with the microstructure passes through a longitudinal stretcher 125, the longitudinal stretching temperature is maintained at 142 ℃, the stretching ratio is 2.0 times, the diffusion plate is stretched by a transverse stretcher 126 after longitudinal stretching, the transverse stretching temperature is maintained at 145 ℃, and the stretching ratio is 3.0 times, forming a diffusion plate with the thickness of 3.0mm and the width of 4m, coating and drying the diffusion plate by a thin plate, maintaining the drying temperature at 100 ℃, cutting the dried diffusion plate meeting the requirements into diffusion plates with certain sizes and shapes by a cutting machine 127, and packaging the qualified cut diffusion plates according to the packaging standard.

The produced diffusion plate polystyrene raw material has the melt index of 3.0g/10min, the thickness of 3.0mm, the maximum width of 4m and a frosted surface structure.

Example 2

The procedure is essentially as in example 1, except that the polymerization temperature is 148 ℃ and the pressure is 78kpa (a), and the batch is heated to 265 ℃ in a devolatilizer and the vacuum is 2.5kpa (a). The diffusion plate with the thickness of 2.0mm and the width of 4m is formed by biaxial stretching.

The produced diffusion plate polystyrene raw material has the melt index of 2.8g/10min, the thickness of 2.0mm, the maximum width of 4m and a frosted surface structure.

Example 3

The procedure is essentially as in example 1, except that the polymerization temperature is 146 ℃ and the pressure 77kpa (a) and the batch is heated to 268 ℃ in the devolatilizer and the vacuum 2kpa (a). The longitudinal stretching temperature is 146 ℃, the stretching ratio is 2.5 times, the transverse stretching temperature is 147 ℃, the stretching ratio is 3.2 times, and the diffusion plate with the thickness of 1.0mm and the width of 4m is formed by biaxial stretching.

The produced diffusion plate polystyrene raw material has the melt index of 2.7g/10min, the thickness of 1.0mm, the maximum width of 4m and a frosted surface structure.

Example 4

The procedure is essentially as in example 1, except that the polymerization temperature is 144 ℃ and the pressure 76kpa (a) and the batch is heated to 270 ℃ in the devolatilizer and the vacuum is 1.5kpa (a). The longitudinal stretching temperature is 147 ℃, the stretching ratio is 3.0 times, the transverse stretching temperature is 148 ℃, the stretching ratio is 3.5 times, and a diffusion plate/sheet with the thickness of 0.5mm and the width of 4m is formed by biaxial stretching.

The melt index of the produced diffusion plate/sheet polystyrene raw material is 2.6g/10min, the thickness is 0.5mm, the maximum width is 4m, and the surface is of a frosted structure.

Example 5

The procedure is essentially as in example 1, except that the polymerization temperature is 142 ℃ and the pressure is 75kpa (a) and the batch is heated to 275 ℃ in the devolatilizer and the vacuum is 1kpa (a). The longitudinal stretching temperature is 148 ℃, the stretching ratio is 3.2 times, the transverse stretching temperature is 149 ℃, the stretching ratio is 3.8 times, and a diffusion plate/sheet with the thickness of 0.2mm and the width of 4m is formed by biaxial stretching.

The melt index of the produced diffusion plate/sheet polystyrene raw material is 2.4g/10min, the thickness is 0.2mm, the maximum width is 4m, and the surface is of a frosted structure.

Example 6

The procedure is as in example 1, except that the polymerization temperature is 140 ℃ and the pressure 74kpa (a) and the batch is heated to 280 ℃ in the devolatilizer and the vacuum 1kpa (a). The longitudinal stretching temperature is 150 ℃, the stretching ratio is 3.5 times, the transverse stretching temperature is 150 ℃, the stretching ratio is 4.0 times, and the diffusion plate/sheet with the thickness of 0.1mm and the width of 4m is formed by biaxial stretching.

The melt index of the produced diffusion plate/sheet polystyrene raw material is 2.4g/10min, the thickness is 0.1mm, the maximum width is 4m, and the surface is of a frosted structure.

Comparative example 1

The process of the plastic melt of the plate-making raw material is the same as that of the embodiment 1, and the plate-making forming process is the traditional roller calendering method; the method comprises the steps of continuously extruding a plastic melt containing diffusion powder through an extrusion die head to form a continuous flaky plastic stream with the width of 0.6-1.2 m, rolling and calendering the flaky plastic stream through a roller, controlling the thickness of the calendered flaky plastic stream to be 3mm and the width of the calendered flaky plastic stream to be 1.2-1.3m, cooling the continuous hot diffusion plate subjected to calendering through a cooling roller, cooling and shaping the diffusion plate, and cutting and stacking the cooled and shaped diffusion plate.

The prepared diffusion plate has the width of 1.2m and the thickness of 3 mm.

Comparative example 2

The process of the plastic melt of the plate-making raw material is the same as that of the embodiment 2, and the plate-making molding process is the traditional roller calendering method; the plate making and forming process is the same as that of comparative example 1, except that the thickness of the calendered sheet plastic stream is controlled at 2 mm.

The prepared diffusion plate has the width of 1.2m and the thickness of 2 mm.

Comparative example 3

The process of the plastic melt as the raw material for manufacturing the plate is the same as that of the embodiment 3, and the plate manufacturing and forming process is the traditional roller calendering method; the plate making and forming process is the same as that of comparative example 1, except that the thickness of the calendered sheet plastic stream is controlled to be 1 mm.

The prepared diffusion plate has the width of 1.2m and the thickness of 1 mm.

Comparative example 4

The process of the plastic melt as the raw material for manufacturing the plate is the same as that of the embodiment 4, and the plate manufacturing and forming process is the traditional roller calendering method; the plate making and forming process is the same as that of comparative example 1, except that the thickness of the calendered sheet plastic stream is controlled to be 0.5 mm.

The prepared diffusion plate has the width of 1.2m and the thickness of 0.5 mm.

Comparative example 5

The process of the plastic melt as the raw material for manufacturing the plate is the same as that of the embodiment 5, and the plate manufacturing and forming process is the traditional roller calendering method; the plate making and forming process is the same as that of comparative example 1, except that the thickness of the calendered sheet plastic stream is controlled to be 0.5 mm.

The prepared diffusion plate has the width of 1.2m and the thickness of 0.2 mm.

Comparative example 6

The process of the plastic melt as the raw material for manufacturing the plate is the same as that of the embodiment 6, and the plate manufacturing and forming process is the traditional roller calendering method; the plate making and forming process is the same as that of comparative example 1, except that the thickness of the calendered sheet plastic stream is controlled to be 0.1 mm.

The prepared diffusion plate has the width of 1.2m and the thickness of 0.1 mm.

Examples of the experiments

The performance of the diffusion plates prepared in examples 1 to 6 and comparative examples 1 to 6 was examined.

Wherein, the melting is as follows: testing according to the test standard ASTM D1238;

light transmittance: testing according to the testing standard ASTM D1003;

haze: testing according to the testing standard ASTM D1003;

tensile strength: testing was carried out according to the test standard ASTM D638.

The results of the measurements are shown in the following table:

as can be seen from the above table, the diffusion plates prepared by the methods of examples 1 to 6 all had widths of up to 4 meters. The width of the diffusion plates of comparative examples 1-6 is far smaller than that of the diffusion plates of the examples, and is only 1.2 meters. More importantly, the tensile strength of the diffuser plate of the examples is above 60MPa, while the tensile strength of the diffuser plates of comparative examples 1-6 is lower than that of the examples by 20 MPa. Therefore, the diffusion plate with ultra-wide width and high tensile strength can be prepared by the method, and the diffusion plate is thin and has excellent light transmittance and haze performance.

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

Claims

1. A preparation method of an ultra-wide bidirectional stretching diffusion plate is characterized by being suitable for preparing the ultra-wide diffusion plate with the width of 0.8-4 m and the thickness of 100-3000 mu m; the preparation method comprises the following steps:

continuously extruding the plastic melt to form a continuous sheet-shaped plastic stream, and calendering the plastic stream to obtain a first diffusion plate; wherein the melt index of the plastic melt is controlled within the range of 1.1g/10 min-3.7 g/10 min;

performing primary stretching and secondary stretching on the first diffusion plate; the stretching temperature of the first stretching and the stretching temperature of the second stretching are controlled within the range of 105-150 ℃, and the stretching multiplying power is controlled within the range of 1.3-4.0; wherein the first stretching is performed along the longitudinal direction of the first diffusion plate, and the second stretching is performed along the transverse direction of the first diffusion plate; or the first stretching is carried out along the transverse direction of the first diffusion plate, and the second stretching is carried out along the longitudinal direction of the first diffusion plate.

2. The ultra-wide biaxial stretching diffuser plate preparation method as recited in claim 1,

the melt index of the plastic melt is controlled within the range of 1.6g/10 min-3.0 g/10 min;

optionally, the stretching temperature of the first stretching and the stretching temperature of the second stretching are both controlled within the range of 140-150 ℃, and the stretching ratio is both controlled within the range of 2.0-4.0.

3. The ultra-wide biaxial stretching diffuser plate preparation method as recited in claim 1,

the first drawing step includes: preheating, wherein the preheating temperature is controlled within the range of 105-180 ℃;

optionally, the first stretching step includes: and (4) shaping, wherein the shaping temperature is controlled within the range of 100-150 ℃.

4. The ultra-wide biaxially oriented diffuser plate manufacturing method according to any one of claims 1 to 3,

the second drawing step includes: preheating, wherein the preheating temperature is controlled within the range of 100-150 ℃;

optionally, the second stretching step includes: shaping, wherein the shaping temperature is controlled within the range of 90-140 ℃;

optionally, the second stretching step includes: cooling, and controlling the cooling temperature to be within the range of 40-120 ℃.

5. The ultra-wide biaxial stretching diffuser plate preparation method as recited in claim 1,

when the plastic melt is continuously extruded, the extrusion temperature is controlled within the range of 180-250 ℃;

optionally, the extrusion pressure is controlled within the range of 2-25 MPa.

6. The ultra-wide biaxial stretching diffuser plate preparation method as recited in claim 1,

the plastic melt is prepared by uniformly mixing a thermoplastic plastic material and diffusion powder and carrying out polymerization reaction at 110-160 ℃;

optionally, the thermoplastic material comprises at least one of styrene, methyl methacrylate or a cyclic olefin;

optionally, the diffusion powder comprises at least one of silicon dioxide, titanium dioxide, barium sulfate or magnesium fluoride; the particle size of the diffusion powder is 2-20 microns;

optionally, the mass ratio of the diffusion powder to the thermoplastic material is (0.1-25): 100, respectively;

optionally, after the polymerization reaction, the plastic melt is also devolatilized and refined by filtration;

optionally, the devolatilization temperature is 240-280 ℃ and the pressure is 0.01-3 kpa (a).

7. An ultra-wide biaxially oriented diffuser plate, characterized in that it is produced by the method of any one of claims 1 to 6.

8. The ultra-wide bidirectional stretching diffusion plate is characterized in that the melt index of the ultra-wide bidirectional stretching diffusion plate is within the range of 1.1g/10 min-3.7 g/10 min;

the width of the ultra-wide bidirectional stretching diffusion plate is 2-4 m, and the thickness of the ultra-wide bidirectional stretching diffusion plate is 100-3000 microns; the tensile strength of the ultra-wide bidirectional stretching diffusion plate is 50-65 MPa;

optionally, the light transmittance of the ultra-wide bidirectional stretching diffusion plate is 40-80%;

optionally, the haze of the ultra-wide biaxial stretching diffuser plate is 80-99%;

optionally, the plate surface structure of the ultra-wide bidirectional stretching diffuser plate includes one or a combination of several of frosted lines, continuous/discontinuous arc-shaped lines, regularly/irregularly distributed dot lines, and continuous/discontinuous V-shaped grooves.

9. A liquid crystal display comprising a diffuser plate made by the method of any one of claims 1-6; or

The liquid crystal display comprising the ultra wide biaxially oriented diffuser plate of claim 8.

10. A flat LED lighting lamp is characterized by comprising a diffusion plate prepared by the preparation method of the ultra-wide bidirectional stretching diffusion plate according to any one of claims 1 to 6; or

The flat panel LED lighting fixture comprising the ultra-wide biaxially oriented diffuser plate of claim 8.