CN116466421A - Light diffusion plate and manufacturing method and application thereof - Google Patents
Light diffusion plate and manufacturing method and application thereof Download PDFInfo
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- CN116466421A CN116466421A CN202310418182.3A CN202310418182A CN116466421A CN 116466421 A CN116466421 A CN 116466421A CN 202310418182 A CN202310418182 A CN 202310418182A CN 116466421 A CN116466421 A CN 116466421A
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 167
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000011347 resin Substances 0.000 claims abstract description 42
- 229920005989 resin Polymers 0.000 claims abstract description 42
- 238000005187 foaming Methods 0.000 claims abstract description 38
- 239000002270 dispersing agent Substances 0.000 claims abstract description 37
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 26
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 24
- 238000002360 preparation method Methods 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 239000004088 foaming agent Substances 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims description 34
- 239000004005 microsphere Substances 0.000 claims description 22
- 239000004417 polycarbonate Substances 0.000 claims description 18
- 229920000515 polycarbonate Polymers 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 11
- 238000003490 calendering Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000007791 dehumidification Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- ACZGCWSMSTYWDQ-UHFFFAOYSA-N 3h-1-benzofuran-2-one Chemical compound C1=CC=C2OC(=O)CC2=C1 ACZGCWSMSTYWDQ-UHFFFAOYSA-N 0.000 claims description 5
- 239000004604 Blowing Agent Substances 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 4
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 4
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 4
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 150000008301 phosphite esters Chemical class 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 abstract description 19
- 230000000052 comparative effect Effects 0.000 description 19
- 239000000463 material Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 238000005469 granulation Methods 0.000 description 4
- 230000003179 granulation Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000002105 nanoparticle Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- 229920012699 PC light diffusion Polymers 0.000 description 2
- 229920002565 Polyethylene Glycol 400 Polymers 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
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- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012975 dibutyltin dilaurate Substances 0.000 description 1
- 238000010096 film blowing Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000013012 foaming technology Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- GPRIERYVMZVKTC-UHFFFAOYSA-N p-quaterphenyl Chemical group C1=CC=CC=C1C1=CC=C(C=2C=CC(=CC=2)C=2C=CC=CC=2)C=C1 GPRIERYVMZVKTC-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
Abstract
The invention provides a light diffusion plate, a preparation method and application thereof, wherein the light diffusion plate comprises a first light diffusion layer, a micro-foaming layer and a second light diffusion layer which are sequentially laminated; the preparation raw materials of the first light diffusion layer and the second light diffusion layer respectively and independently comprise resin, light diffusion agent, antioxidant and dispersing agent; the micro-foaming layer comprises resin, a micro-foaming agent, an antioxidant and a dispersing agent. The light diffusion plate reduces the overall weight of the light diffusion plate and the warping and shrinkage of the plate by arranging the micro-foaming layer, so that the light diffusion plate has the characteristics of high light transmittance and high haze.
Description
Technical Field
The invention belongs to the technical field of light diffusion plates, and particularly relates to a light diffusion plate, a manufacturing method and application thereof.
Background
The light diffusion plate is also called a light homogenizing plate, has the functions of light diffusion, light transmission and light shielding, and is an important component material in a lampshade or a liquid crystal display. The light diffusion plate is generally prepared by adding a light diffusion agent to a base material, and the light diffusion agent can generate diffraction, scattering, refraction, reflection and other effects or a combination of the effects, thereby obtaining a light diffusion effect.
Common light diffusing agents can be classified into inorganic light diffusing agents and organic light diffusing agents. Inorganic light dispersing agents such as inorganic nano particles of barium sulfate and silicon dioxide are generally added into the traditional lampshade material, when the inorganic nano particles are added, light can be refracted to all directions through the surfaces of the inorganic nano particles to achieve the effect of light diffusion, namely uniform light, but the light cannot penetrate through the inorganic nano particles, so that the light energy loss is large, the light transmittance is low, only the softness of light can be changed, and the brightening effect is poor. Organic light diffusion agents, such as acrylic (PMMA) microspheres, have relatively poor temperature resistance, and can lead to serious yellowing of materials after long-term heating, so that the service life of the light diffusion plate is shortened.
CN110105510a discloses a PC light diffusion plate, the composition and mass percentage of the PC light diffusion plate are: 96% -99% of PC, 1% -4% of microsphere light dispersing agent, wherein the microsphere light dispersing agent is prepared from nano SiO 2 The particles are uniformly dispersed into the polynuclear shell structure formed in the PS microspheres, and the PS microspheres are uniformly dispersed with the porous structure. The technical proposal prepares an inorganic-organic composite microsphere by a method of coating inorganic materials with organic materials, solves the problem of inorganic SiO 2 The microsphere has the advantages that the light diffusion plate has good light diffusion performance due to the low light transmittance caused by poor compatibility with organic resin, and the haze of the light diffusion plate is improved.
CN109265959a discloses a plastic lampshade, which is prepared from, by weight, 0.5-1 part of nano silicon dioxide, 2-4 parts of nano aluminum nitride, 0.5-1 part of dibutyl tin dilaurate, 0.1-0.3 part of diphenyl biphenyl diamine, 0.1-0.3 part of light stabilizer, 6-10 parts of LED light dispersing agent, 4-8 parts of nano light scattering particles, and 30-50 parts of thermoplastic base material. The plastic lampshade provided by the technical scheme has the characteristics of high temperature resistance, good performance, stable color quality, high light transmittance, good light guide effect and less light efficiency loss, and can enlarge the light-emitting angle of the LED lamp panels arranged in a plane.
CN112831172a discloses a PC frosting material, which is prepared from the following raw materials, by weight, 80-90 parts of polycarbonate, 6-16 parts of composite light dispersing agent, 0.5-0.6 part of flame retardant, 0.4-2 parts of antioxidant and 0.3-0.6 part of lubricant; the composite light dispersing agent is formed by compounding PMMA microspheres, organic silicon microspheres and nano barium sulfate. According to the technical scheme, the composite light dispersing agent formed by compounding PMMA microspheres, organic silicon microspheres and nano barium sulfate has a synergistic effect on improving the haze and the light transmittance of polycarbonate, and meanwhile, the haze and the light transmittance of PC frosting materials can be improved.
The common disadvantage of using organic light diffusion agents or inorganic light diffusion agents to prepare the light diffusion plate is that a large amount of diffusion agents need to be added to achieve a high haze effect, so that the light transmittance of the light diffusion plate is not high, and meanwhile, the cost and the weight of materials are increased.
Therefore, there is a need to develop a light diffusion plate with high haze, high light transmittance, low cost, and light weight.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a light diffusion plate, and a manufacturing method and application thereof. The light diffusion plate provided by the invention has the advantages that the integral weight of the light diffusion plate is reduced, and the warping and shrinkage of the plate are reduced by arranging the first light diffusion layer, the micro-foaming layer and the second light diffusion layer, so that the light diffusion plate has the characteristics of high light transmittance and high haze.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a light diffusion plate including a first light diffusion layer, a micro-foaming layer, and a second light diffusion layer laminated in this order.
The preparation raw materials of the first light diffusion layer and the second light diffusion layer respectively and independently comprise resin, light diffusion agent, antioxidant and dispersing agent.
The micro-foaming layer comprises resin, a micro-foaming agent, an antioxidant and a dispersing agent.
Preferably, the resin comprises polycarbonate.
In the invention, the polycarbonate has the advantages of good light transmittance (the light transmittance is about 90%), excellent shock resistance, high temperature resistance, good flame retardant property, no toxicity and the like. The polycarbonate plate has the impact strength which is 250-300 times that of common glass with the same thickness and 30 times that of an acrylic plate, has good safety performance, can replace glass materials, and can be widely applied to the aspects of outer cover materials of lighting lamps, particularly outer cover materials of large-size lamp boxes, and the like.
Preferably, the polycarbonate has a melt index of 3 to 10g/10min, such as 3g/10min, 4g/10min, 5g/10min, 6g/10min, 7g/10min, 8g/10min, 9g/10min or 10g/10min, etc.
Preferably, the micro-blowing agent is a closed cell blowing agent.
Preferably, the micro-blowing agent comprises Hydrocerol XH-901.
Preferably, the antioxidant comprises any one or a combination of at least two of benzofuranone, hydroxylamine antioxidants or phosphite esters.
Preferably, the dispersant comprises any one or a combination of at least two of polyethylene glycol based dispersants, polyacrylic based dispersants or polyvinylpyrrolidone.
Preferably, the light diffusing agent comprises organic silicon microspheres and/or acrylic microspheres.
Preferably, the silicone microspheres have a particle size of 1 μm to 5 μm, for example 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm or 5 μm, etc.
Preferably, the particle size of the acrylic microsphere is 1 μm to 10 μm, for example 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm, etc.
According to the invention, the light diffusion plate adopts a structure of the first light diffusion layer, the micro-foaming layer and the second light diffusion layer which are sequentially stacked, the first light diffusion layer and the second light diffusion layer realize light diffusion by adding the light diffusion agent, the micro-foaming layer forms micropores by adding the micro-foaming agent but not adding any light diffusion agent, so that light diffusion and transmission are realized, namely the whole weight of the diffusion plate is reduced, and the light diffusion plate realizes the effects of high light transmittance and high haze by adding a small amount of the light diffusion agent.
Preferably, the preparation raw materials of the first light diffusion layer and the second light diffusion layer each independently comprise the following components in percentage by mass:
the mass percentage of the resin in the first light diffusion layer and the second light diffusion layer may be 93.7%, 93.85%, 94.6%, 95.2%, 96.4%, 97.8%, 97.9%, 98% or 98.9%, etc. independently.
The mass percentage of the light diffusing agent in the first light diffusing layer and the second light diffusing layer can be 0.5%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5% respectively.
The mass percentage of the antioxidant in the first light diffusion layer and the second light diffusion layer can be 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.7% or 0.8% respectively and independently.
The mass percentage of the dispersant in the first light diffusion layer and the second light diffusion layer can be 0.3%, 0.32%, 0.35%, 0.38%, 0.4%, 0.42%, 0.45%, 0.48%, 0.5% or the like independently.
Preferably, the preparation raw materials of the micro-foaming layer comprise the following components in percentage by mass:
the mass percentage of the resin in the micro-foaming layer can be 93.7%, 94%, 94.5%, 95%, 95.5%, 95.8%, 96% or 96.4% and the like.
The mass percentage of the micro foaming agent in the micro foaming layer can be 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8% or 5% and the like.
The mass percentage of the antioxidant in the micro-foaming layer can be 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.7% or 0.8% and the like.
Preferably, the mass percentage of the dispersant in the micro-foaming layer may be 0.3%, 0.32%, 0.35%, 0.38%, 0.4%, 0.42%, 0.45%, 0.48%, 0.5%, or the like.
Preferably, the thickness of the light diffusion plate is 1mm-5mm, such as 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.
Preferably, the percentage of the thickness of the first light diffusion layer is 10-15%, such as 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5% or 15%, etc., based on the thickness of the light diffusion plate being 100%.
Preferably, the micro-foam layer has a thickness in a percentage of 70-80%, such as 70%, 70.5%, 71%, 71.5%, 72%, 72.5%, 73%, 73.5%, 74%, 74.5% or 75% etc.
Preferably, the percentage of the thickness of the second light diffusion layer is 10-15%, such as 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5% or 15%, etc.
In a second aspect, the present invention provides a method for preparing the light diffusion plate according to the first aspect, the method comprising the steps of:
and sequentially laminating the preparation raw materials of the first light diffusion layer, the micro-foaming layer and the second light diffusion layer, and carrying out coextrusion and calendaring to obtain the light diffusion plate.
Preferably, the preparation raw materials of the first light diffusion layer and the preparation raw materials of the second light diffusion layer are respectively and independently resin, light diffusion agent, antioxidant and dispersing agent, and are mixed, extruded and granulated to obtain the light diffusion resin particles.
Preferably, the preparation raw materials of the micro-foaming layer are resin, a micro-foaming agent, an antioxidant and a dispersing agent, and the micro-foaming resin particles are obtained through mixing, extruding and granulating.
Preferably, the mixing is a high-speed pre-dispersion mixing.
Preferably, the extrusion apparatus is a twin screw extruder.
Preferably, the temperature of the twin-screw extruder is 250-285 ℃ (e.g. 250 ℃, 255 ℃, 260 ℃, 265 ℃, 270 ℃, 275 ℃, 280 ℃ or 285 ℃, etc.), the screw speed is 550-750r/min, e.g. 550r/min, 570r/min, 590r/min, 600r/min, 620r/min, 650r/min, 680r/min, 700r/min, 720r/min or 750r/min, etc.
Preferably, the extrusion further comprises water cooling and dehumidification.
Preferably, the calendaring device is a three-roll calendaring co-extrusion machine.
The preparation method comprises the steps of obtaining a preparation raw material of a first light diffusion layer, a preparation raw material of a micro-foaming layer and a preparation raw material of a second light diffusion layer through blending modification, and obtaining the light diffusion plate through multilayer coextrusion.
In a third aspect the present invention provides a light diffusing assembly comprising a light diffusing plate according to the first aspect.
A fourth aspect the present invention provides a liquid crystal display comprising a light diffusing plate as described in the first aspect or a light diffusing assembly as described in the third aspect.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the first light diffusion layer, the micro-foaming layer and the second light diffusion layer which are sequentially stacked are adopted, and the first light diffusion layer and the second light diffusion layer realize high coverage rate and high haze of the light diffusion plate and prevent light transmission of the direct type backlight source by adding the light diffusion agent; the micro-foaming layer is formed by adopting a micro-foaming technology and is formed by coextrusion with the first light diffusion layer and the second light diffusion layer, so that the weight of the light diffusion plate is reduced, the warping and shrinkage of the light diffusion plate are reduced, and meanwhile, the light diffusion and transmittance are improved. The light transmittance of the light diffusion plate is more than or equal to 85%, the haze value is more than or equal to 90%, the shrinkage rate is less than or equal to 0.02%, and compared with the traditional light diffusion plate, the weight is reduced.
Drawings
FIG. 1 is a schematic view of a light diffusion plate according to embodiment 1;
wherein 1-a first light diffusion layer; 2-a micro-foaming layer; 3-a second light diffusion layer.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
The contents of the respective components in the examples and comparative examples are in mass percent.
Example 1
The embodiment provides a light diffusion plate and a preparation method thereof, wherein the light diffusion plate comprises a first light diffusion layer, a micro-foaming layer and a second light diffusion layer which are sequentially stacked.
The first light diffusion layer is prepared from 94.4% polycarbonate (melt index 3g/10min, model K-1300Y), 5% light diffusion agent (organosilicon microsphere, particle size 2 μm, model SL-200M), 0.3% antioxidant (benzofuranone) and 0.3% dispersant (polyethylene glycol dispersant, PEG 400);
the preparation raw materials of the micro-foaming layer comprise 96.2% of polycarbonate (with a melt index of 3g/10min and model K-1300Y), 3% of micro-foaming agent (Hydrocerol XH-901), 0.3% of antioxidant (benzofuranone) and 0.5% of dispersing agent (polyvinylpyrrolidone, PVPK 15);
the second light diffusion layer was prepared from 94.4% polycarbonate (melt index 3g/10min, model K-1300Y), 5% light diffusion agent (silicone microsphere, particle size 2 μm, model SL-200M), 0.3% antioxidant (benzofuranone) and 0.3% dispersant (polyethylene glycol dispersant, PEG 400).
The preparation method of the light diffusion plate comprises the following steps:
(1) The method comprises the steps of pre-dispersing and mixing polycarbonate, a light dispersing agent, an antioxidant and a dispersing agent at a high speed, extruding the mixture through a double-screw extruder, and setting the temperature of the double-screw extruder: the temperatures of the sections of the first zone to the ninth zone are 250 ℃, 270 ℃, 280 ℃, 285 ℃, 280 ℃, the die head temperature is 280 ℃, the main machine screw speed is 750r/min, and the light diffusion resin particles of the first light diffusion layer are obtained through water cooling, dehumidification and granulation.
(2) The method comprises the steps of pre-dispersing and mixing polycarbonate, a light dispersing agent, an antioxidant and a dispersing agent at a high speed, extruding the mixture through a double-screw extruder, and setting the temperature of the double-screw extruder: the temperatures of the sections of the first zone to the ninth zone are 250 ℃, 270 ℃, 280 ℃, 285 ℃, 280 ℃, the die head temperature is 280 ℃, the main machine screw speed is 550r/min, and the light diffusion resin particles of the second light diffusion layer are obtained through water cooling, dehumidification and granulation.
(3) The method comprises the steps of pre-dispersing and mixing polycarbonate, a micro-foaming agent, an antioxidant and a dispersing agent at a high speed, extruding the mixture through a double-screw extruder, and setting the temperature of the double-screw extruder: the temperatures of the sections of the first zone to the ninth zone are 250 ℃, 270 ℃, 280 ℃, 285 ℃, 280 ℃, the die head temperature is 280 ℃, the main machine screw speed is 600r/min, and the micro-foaming resin particles of the micro-foaming layer are obtained through water cooling, dehumidification and granulation.
(4) Adding light diffusion resin particles of a first light diffusion layer into an extruder A, adding micro-foaming resin particles into an extruder B and adding light diffusion resin particles of a second light diffusion layer into an extruder C, plasticizing and melting the light diffusion resin particles of the first light diffusion layer, the micro-foaming resin particles after melting and the light diffusion resin particles of the second light diffusion layer after melting in the extruder, sequentially layering and arranging and extruding the light diffusion resin particles of the first light diffusion layer, the light diffusion resin particles after melting and the light diffusion resin particles of the second light diffusion layer in a die head of a three-layer film blowing machine, wherein the screw rotation speed ratio of the extruder A, the extruder B and the extruder C is 15:70:15, calendering the light diffusion plate by a three-roll calendering co-extrusion molding machine, and adjusting the rotation speed of the three-roll calendering roll to enable the thickness of the light diffusion plate to be 1mm, so as to obtain the light diffusion plate.
Examples 2 to 5 were prepared in the same manner as in example 1, except that the kinds and contents of the raw materials were as shown in Table 1.
TABLE 1
Example 6
This comparative example provides a light diffusion plate and a method for producing the same, differing from example 1 only in that the rotation speed of the three-roll calender roll was adjusted so that the thickness of the light diffusion plate was 2mm, and otherwise the same as example 1.
Example 7
This comparative example provides a light diffusion plate and a method for producing the same, differing from example 1 only in that the rotation speed of the three-roll calender roll was adjusted so that the thickness of the light diffusion plate was 5mm, and otherwise the same as example 1.
Comparative example 1
This comparative example provides a light diffusion plate and a method for producing the same, differing from example 1 only in that no micro-foaming agent is added to the micro-foaming layer resin, and the other is the same as example 1.
Comparative example 2
This comparative example provides a light diffusion plate and a method for producing the same, differing from example 1 only in that no light diffusing agent is added to both the light diffusion resin particles of the first layer and the light diffusion resin particles of the second light diffusion layer, and otherwise the same as example 1.
Comparative example 3
This comparative example provides a light diffusion plate and a method for producing the same, which are the same as in example 1 except that no light diffusing agent is added to the light diffusion resin particles of the first layer as in example 1.
Comparative example 4
The comparative example provides a light diffusion plate and a preparation method thereof, wherein the preparation method of the light diffusion plate is as follows:
91.2% of polycarbonate (melt index 3g/10min, model K-1300Y), 5% of light diffusant (organosilicon microsphere, particle size 2 μm, model SL-200M), 3% of micro-foaming agent (Hydrocerol XH-901), 0.3% of antioxidant (mixture of hydroxylamine antioxidant Revonox 420 and phosphite ester, mass ratio 1:1) and 0.5% of dispersing agent (polyvinylpyrrolidone, PVPK 15) are mixed in a high speed pre-dispersion way, extruded by a twin-screw extruder, and the temperature of the twin-screw extruder is set: the temperature of each section of the first zone to the ninth zone is 250 ℃, 270 ℃, 280 ℃, 285 ℃, 280 ℃, the die head temperature is 280 ℃, the main machine screw speed is 750r/min, and the light diffusion plate is obtained through water cooling, dehumidification, granulation, resin particle extrusion and calendaring.
Comparative example 5
This comparative example provides a light diffusion plate and a method for producing the same, differing from example 1 only in that the micro-foaming agent (Hydrocerol XH-901) in the micro-foaming resin particles was replaced with a micro-foaming agent (W3835), and otherwise the same as in example 1.
The light diffusion plates provided in examples 1 to 7 and comparative examples 1 to 5 were subjected to the following performance test.
(1) Haze: the test was performed with reference to GB/T2410-2008.
(2) Light transmittance: the test was performed with reference to GB/T2410-2008.
(3) Shrinkage ratio: the test was performed with reference to ASTM D1204.
(4) Thickness: and observing the light diffusion plate by using a microscope.
(5) Density: the test is performed with reference to ISO 1183.
The test results are shown in Table 2
TABLE 2
As can be seen from the test results in Table 2, the light transmittance of the light diffusion plates provided in examples 1 to 7 was not less than 85%, the haze value was not less than 90%, and the shrinkage was not more than 0.02%.
In comparison with example 1, without the addition of the micro-foaming agent (comparative example 1), the density of the produced light diffusion plate was increased, and both haze and transmittance were decreased.
In comparison with example 1, if no light diffusing agent was added to both the light diffusing resin particles of the first layer and the light diffusing resin particles of the second light diffusing layer (comparative example 2), the haze of the obtained light diffusing plate was significantly reduced, and the effect of light fogging could not be achieved in the application, affecting the use.
In comparison with example 1, if no light diffusing agent was added to the light diffusing resin particles of the first layer (comparative example 3), the haze of the light diffusing plate was lowered, and the effect of light fogging could not be achieved in the application, affecting the use.
When a resin, a light diffusing agent, a micro-foaming agent, an antioxidant and a dispersing agent are mixed to form a light diffusing plate having a one-layer structure (comparative example 4), the haze and the transmittance of the obtained light diffusing plate are reduced, and the effect of multiple layers cannot be achieved, and the shrinkage of the size of the light diffusing plate is increased, resulting in a decrease in the stability of the structure due to the increase of the shrinkage when the light diffusing plate is applied, as compared with example 1.
Compared with example 1, if the micro-foaming agent (hydro-polyol XH-901) in the micro-foaming resin particles is replaced by the micro-foaming agent (W3835) (comparative example 6), the obtained light diffusion plate cannot well play a role in foaming, the haze and the light transmittance of the finally obtained light diffusion plate are obviously reduced, the shrinkage is obviously increased, and the foaming condition is not uniform, so that the size of the product is unstable.
The applicant states that the process of the invention is illustrated by the above examples, but the invention is not limited to, i.e. does not mean that the invention must be carried out in dependence on the above process steps. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of selected raw materials, addition of auxiliary components, selection of specific modes, etc. fall within the scope of the present invention and the scope of disclosure.
Claims (10)
1. A light diffusion plate, characterized in that the light diffusion plate comprises a first light diffusion layer, a micro-foaming layer and a second light diffusion layer which are sequentially laminated;
the preparation raw materials of the first light diffusion layer and the second light diffusion layer respectively and independently comprise resin, light diffusion agent, antioxidant and dispersing agent;
the preparation raw materials of the micro-foaming layer comprise resin, a micro-foaming agent, an antioxidant and a dispersing agent.
2. A light diffuser plate according to claim 1, wherein said resin comprises polycarbonate;
preferably, the polycarbonate has a melt index of 3 to 10g/10min.
3. A light diffuser plate according to claim 1 or 2, wherein the micro-foaming agent is a closed cell foaming agent;
preferably, the micro-blowing agent comprises Hydrocerol XH-901;
preferably, the antioxidant comprises any one or a combination of at least two of benzofuranone, hydroxylamine antioxidants or phosphite esters;
preferably, the dispersing agent comprises any one or a combination of at least two of polyethylene glycol dispersing agents, polyacrylic dispersing agents or polyvinylpyrrolidone.
4. A light diffusing plate according to any one of claims 1 to 3, wherein the light diffusing agent comprises silicone microspheres and/or acrylic microspheres;
preferably, the particle size of the organosilicon microspheres is 1-5 μm;
preferably, the particle size of the acrylic microsphere is 1-10 μm.
5. The light diffusion plate according to any one of claims 1 to 4, wherein the raw materials for preparing the first light diffusion layer and the second light diffusion layer each independently comprise the following components in mass percent:
preferably, the preparation raw materials of the micro-foaming layer comprise the following components in percentage by mass:
6. a light diffuser plate according to any one of claims 1-5, characterized in that the thickness of the light diffuser plate is 1-5 mm;
preferably, the percentage of the thickness of the first light diffusion layer is 10 to 15% based on 100% of the thickness of the light diffusion plate;
preferably, the percentage of the thickness of the micro-foaming layer is 70-80%;
preferably, the percentage of the thickness of the second light diffusion layer is 10-15%.
7. The method of manufacturing a light diffusion plate according to any one of claims 1 to 6, comprising the steps of:
and sequentially laminating the preparation raw materials of the first light diffusion layer, the micro-foaming layer and the second light diffusion layer, and carrying out coextrusion and calendaring to obtain the light diffusion plate.
8. The method according to claim 7, wherein the raw materials for producing the first light diffusion layer and the raw materials for producing the second light diffusion layer are each independently a resin, a light diffusing agent, an antioxidant and a dispersing agent, and the obtained light diffusion resin particles are obtained by mixing, extruding, and granulating;
preferably, the preparation raw materials of the micro-foaming layer are resin, a micro-foaming agent, an antioxidant and a dispersing agent, and the micro-foaming resin particles are obtained by mixing, extruding and granulating;
preferably, the mixing is a high-speed pre-dispersion mixing;
preferably, the extrusion device is a twin screw extruder;
preferably, the temperature of the double-screw extruder is 250-285 ℃, and the screw rotating speed is 550-750r/min;
preferably, the extrusion further comprises water cooling and dehumidification;
preferably, the calendaring device is a three-roll calendaring co-extrusion machine.
9. A light diffusing assembly comprising the light diffusing plate of any one of claims 1 to 6.
10. A liquid crystal display, characterized in that the liquid crystal display comprises the light diffusion plate according to any one of claims 1 to 6 or the light diffusion assembly according to claim 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310418182.3A CN116466421A (en) | 2023-04-19 | 2023-04-19 | Light diffusion plate and manufacturing method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310418182.3A CN116466421A (en) | 2023-04-19 | 2023-04-19 | Light diffusion plate and manufacturing method and application thereof |
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| CN202310418182.3A Pending CN116466421A (en) | 2023-04-19 | 2023-04-19 | Light diffusion plate and manufacturing method and application thereof |
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| Country | Link |
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