CN108164630A - Continous way modified polystyrene leaded light board production technology and modified polystyrene light guide plate - Google Patents
Continous way modified polystyrene leaded light board production technology and modified polystyrene light guide plate Download PDFInfo
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- CN108164630A CN108164630A CN201711456811.2A CN201711456811A CN108164630A CN 108164630 A CN108164630 A CN 108164630A CN 201711456811 A CN201711456811 A CN 201711456811A CN 108164630 A CN108164630 A CN 108164630A
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- Prior art keywords
- modified polystyrene
- light guide
- guide plate
- polystyrene
- light
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/06—Hydrocarbons
- C08F212/08—Styrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/001—Removal of residual monomers by physical means
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
Abstract
The present invention provides a kind of continous way modified polystyrene leaded light board production technology and modified polystyrene light guide plates, are related to light guide plate technical field, include the following steps：Styrene monomer and methyl methacrylate monomer are first subjected to binary copolymerization, modified polystyrene melt is made；The heat preservation of modified polystyrene melt is delivered to plate forming system again, modified polystyrene melt is made by modified polystyrene light guide plate by plate forming system, existing polystyrene light guide plate is alleviated to be process by polystyrene master batch and guide-lighting powder heating fusion plastification, there is fisheye and the partially carbonized polystyrene that stiff material is formed on polystyrene light guide plate, cause its light extraction uneven, light transmittance is low, the technical issues of plate face yellowing light, modified polystyrene light guide plate uniform in light emission provided by the invention, transmissivity is high, without yellow light, water absorption rate is low, it can keep good dimensional stability, ensure the technique effect of the image quality clarity of liquid crystal display device.
Description
Technical field
The present invention relates to light guide plate technical field of producing, more particularly, to a kind of continous way modified polystyrene leaded light
Board production technology and modified polystyrene light guide plate.
Background technology
As industrial society develops into the informatization society of height, the electronics as the medium for showing and transmitting a variety of information
The importance of display device increasingly increases.The especially compound liquid crystal display device of liquid crystal and semiconductor technology is widely used in
Various fields, but the liquid crystal of this liquid crystal display device can not shine in itself, need to set light source behind device, and lead to
Cross light guide plate and line source be converted into area source so that device can uniformly light-emitting, achieve the effect that display.
Traditional light guide plate is mostly prepared using polymethyl methacrylate, however, as polymethyl methacrylate
Special chemical constitution, make it very fragile to moisture, lead to the light guide plate of this material size under hot and humid environment
Stability is poor, is susceptible to bending, influences the display effect of liquid crystal display device.
Present someone has developed polystyrene light guide plate, but the light transmittance of polystyrene light guide plate is relatively low, in order to improve
The light transmittance of polystyrene light guide plate needs that polystyrene will be prepared again after guide-lighting powder and the plasticizing of polystyrene master batch mixed melting
Light guide plate, but polystyrene master batch is in process, it is difficult to which plastifying fusion is uniform, and part polystyrene is in plasticizing process
It can be carbonized so that the fisheye not formed on polystyrene light guide plate there is only the micro stiff material not being plasticized fully, and due to
The presence of partially carbonized polystyrene causes plate face yellowing, leads to that its light extraction is uneven, and light transmittance is poor, can not ensure liquid crystal display
The image quality clarity of device.
In view of this, it is special to propose the present invention.
Invention content
One of the objects of the present invention is to provide a kind of modified polystyrene leaded light board production technologies, existing poly- to alleviate
Styrene light guide plate is mixed and processed by polystyrene master batch and guide-lighting powder, but polystyrene master batch is in process
In, it is difficult to which plastifying fusion is uniform, and part polystyrene can be carbonized in plasticizing process so that not only be deposited on polystyrene light guide plate
In the fisheye that the micro stiff material not being plasticized fully is formed, and since the presence of partially carbonized polystyrene so that plate face is general
Huang, leads to that its light extraction is uneven, and light transmittance is poor, the technical issues of can not ensureing the image quality clarity of liquid crystal display device.
Modified polystyrene leaded light board production technology provided by the invention, includes the following steps：
(a) styrene monomer and methyl methacrylate monomer are added in reaction kettle and carries out binary copolymerization, be made and be modified
Polystyrene melt；
(b) heat preservation of modified polystyrene melt is delivered to plate forming system, it will be modified poly- by plate forming system
Modified polystyrene light guide plate is made in styrene melt.
Further, in step (a), the mass ratio of the styrene monomer and methyl methacrylate monomer is (50-
95)：(5-50), preferably (55-80)：(20-45).
Further, in step (b), the plate forming system, including the first mixer, the gear set gradually
Pump, the second mixer, extrusion die and calender；
Preferably, the calender includes at least two stacks, and micro-structure is provided on an at least stack
Embossing.
Further, the plate forming system further includes cooler, and the cooler is used for the modification of calendering formation
Polystyrene light guide plate is cooled down.
Further, the continous way modified polystyrene leaded light board production technology further includes step (s), the step
(s) it is set between step (a) and step (b), the step (s) is to carry out modified polystyrene melt at devolatilization and filtering
Reason.
Further, in step (a), the number-average molecular weight for the modified polystyrene polymerizeing is 5-20 ten thousand, preferably
For 10-15 ten thousand.
Further, in step (b), the temperature for keeping the temperature conveying is 200-250 DEG C, preferably 220-230 DEG C.
Further, in step (a), the polymerization temperature for carrying out binary copolymerization is 110-160 DEG C, preferably 130-150
℃。
The second object of the present invention is to provide to be prepared using above-mentioned continous way modified polystyrene leaded light board production technology
Obtained modified polystyrene light guide plate, the thickness of the modified polystyrene light guide plate is 0.5-5mm, preferably 1-3mm.
Further, at least one plate face of the modified polystyrene light guide plate is provided with micro-structure burr, described micro-
The cross section of structure burr is semicircle shape, wavy or triangular shape.
Modified polystyrene light guide plate provided by the invention is copolymerized by styrene monomer and methyl methacrylate monomer
It forms, and the modified polystyrene melt for being copolymerized generation is directly prepared into modified polystyrene light guide plate, adds without carrying out plasticizing
Work so that modified polystyrene light guide plate eliminates the fisheye formed during the stiff material not being plasticized fully because micro, also avoid because
Plasticizing processing is so that the problem of partially modified polystyrene is carbonized and causes modified polystyrene light guide plate yellowing light so that is made
Modified polystyrene light guide plate uniform in light emission, light transmittance is high, and water absorption rate is low, ensure that the image quality of liquid crystal display device is shown clearly
Clear degree.
In addition, continous way modified polystyrene leaded light board production technology provided by the invention, due to reducing polystyrene
The processing preparation of master batch and fusion plastification technique, save a large amount of energy consumption, reduce the production of modified polystyrene light guide plate
Cost.
Modified polystyrene light guide plate uniform in light emission provided by the invention, no yellow light, transmissivity is high, and water absorption rate is low, can
Good dimensional stability is kept, ensures the image quality clarity of liquid crystal display device.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the continous way modified polystyrene light guide plate production technological process that the embodiment of the present invention 1 provides；
Fig. 2 is the structure diagram of modified polystyrene light guide plate that embodiment 1 provides；
Fig. 3 is the structure diagram of modified polystyrene light guide plate that embodiment 2 provides；
Fig. 4 is the structure diagram of modified polystyrene light guide plate that embodiment 3 provides.
Icon：101- reaction kettles；102- devolatilizers；103- filters；The first mixers of 104-；105- gear pumps；106-
Second mixer；107- extrusion dies；108- tri-roll press machines；109- water-cooling coolers；110- plank collecting boxs；Low group of 111-
Divide cooler；112- surge tanks；113- buffers cooler；114- vacuum systems；115- trash eliminators.
Specific embodiment
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's all other embodiments obtained without making creative work, shall fall within the protection scope of the present invention.
Existing conventional light guiding plate is mostly prepared using polymethyl methacrylate, however, as polymethylacrylic acid
The special chemical constitution of methyl esters, makes it very fragile to moisture, leads to the light guide plate of this material under hot and humid environment
Poor dimensional stability is susceptible to bending, influences the picture display effect and service life of liquid crystal display device.
Present someone has developed polystyrene light guide plate, and first passing through styrene monomer polymerization becomes polystyrene, then will be poly-
Styrene is processed into polystyrene master batch, and fusion plastification post-processing is heated after finally polystyrene master batch is mixed with guide-lighting powder again
Into polystyrene light guide plate, but in the engineering due to heating fusion plastification in polystyrene master batch, it is difficult to ensure that all is poly-
Styrene master batch is heated evenly, and is all melted, and therefore, is often had the small stiff material that part does not melt completely and is present in polystyrene
On light guide plate, and part polystyrene will appear carbonization phenomenon in plasticizing process, and the transmission of polystyrene light guide plate is caused to be imitated
Fruit is poor, and there are the fisheyes that multiple stiff material are formed, plate face yellowing light can not ensure the image quality clarity of liquid crystal display device.
According to an aspect of the present invention, the present invention provides a kind of modified polystyrene leaded light board production technology, including
Following steps：
(a) styrene monomer and methyl methacrylate monomer are added in reaction kettle and carries out binary copolymerization, be made and be modified
Polystyrene melt；
(b) heat preservation of modified polystyrene melt is delivered to plate forming system, it will be modified poly- by plate forming system
Modified polystyrene light guide plate is made in styrene melt.
In the present invention, modified polystyrene melt is prepared by methyl methacrylate and styrene monomer copolymerization, made
It obtains modified polystyrene and melts the double dominant for having both polystyrene and polymethyl methacrylate, both the low water with polystyrene
Divide absorptivity and good dimensional stability, and the light transmittance with polymethyl methacrylate, can effectively ensure that liquid crystal
The image quality clarity of showing device.
Modified polystyrene light guide plate provided by the invention is copolymerized by styrene monomer and methyl methacrylate monomer
It forms, and the modified polystyrene melt for being copolymerized generation is directly prepared into modified polystyrene light guide plate, adds without carrying out plasticizing
Work so that modified polystyrene light guide plate eliminates the fisheye formed during the stiff material not being plasticized fully because micro, also avoid because
Plasticizing processing is so that the problem of partially modified polystyrene is carbonized and causes modified polystyrene light guide plate yellowing light so that is made
Modified polystyrene light guide plate uniform in light emission, light transmittance is high, and water absorption rate is low, ensure that the image quality of liquid crystal display device is shown clearly
Clear degree.
In addition, continous way modified polystyrene leaded light board production technology provided by the invention, due to reducing polystyrene
The processing preparation of master batch and fusion plastification technique, save a large amount of energy consumption, reduce the production of modified polystyrene light guide plate
Cost.
In the preferred embodiment of the present invention, in step (a), the styrene monomer and methyl methacrylate
The mass ratio of ester monomer is (50-95)：(5-50), preferably (55-80)：(20-45).
In the typical but non-limiting embodiment of the present invention, styrene monomer and methyl methacrylate monomer
Mass ratio is 50:50、55:45、60:40、65:35、70:30、75:25、80:20、85:15、90:10、95:5.
When polymerization prepares modified polystyrene, in order to control the performance of modified polystyrene, need styrene monomer
It is controlled with the mass ratio of methyl methacrylate monomer at (50-95)：(5-50), to ensure the modified polystyrene being prepared
Light guide plate not only has good translucency and refractiveness, but also with good dimensional stability, especially when styrene monomer with
The mass ratio of methyl methacrylate monomer is (55-80)：When (20-45), made modified polystyrene light guide plate it is comprehensive
It is more excellent to close performance.
In the preferred embodiment of the present invention, in rapid (b), the plate forming system, including setting gradually
The first mixer, gear pump, the second mixer, extrusion die and calender；
Preferably, the calender includes at least two stacks, and micro-structure is provided on an at least stack
Embossing.
In the preferred embodiment of the present invention, the first mixer, gear pump, the second mixer and extrusion die are successively
Connection, the first mixer are used to modified polystyrene melt carrying out mixed once, the input terminal of gear pump and the first mixer
It is connected, gear pump is to convey modified polystyrene by the swept volume variation and movement that are formed between pumping cylinder and meshing gear
Melt conveys modified polystyrene melt so that modified polystyrene melt passes through gear pump engaging tooth by using gear pump
Wheel mutual extruding, secondary mixing more uniformly；Second mixer is connected with the output terminal of gear pump, is squeezed by gear pump
Mixed modified polystyrene melt is pressed to be mixed three times into the second mixer, to ensure the modification into extrusion die
Polystyrene melt mixes more uniform.Extrusion die is used to pass through extrusion by mixed modified polystyrene melt three times
Die head is squeezed out, and calender is used to modified polystyrene melt carrying out calendering formation, modified polystyrene leaded light is made
Plate.
In further preferred embodiment of the present invention, calender includes at least two stacks, wherein at least one
Guide-lighting embossing is provided on stack.
In order to improve modified polystyrene light guide plate outgoing light homogeneity, need to be provided on modified polystyrene light guide plate
Therefore micro-structure burr, is provided with micro-structure embossing, so that preparing in a preferred embodiment of the invention, on stack
Micro-structure burr is provided on the modified polystyrene light guide plate formed.
In the typical but non-limiting embodiment of the present invention, calender can be two roll calender, or
Tri-roll press machine, preferably tri-roll press machine.
It, can be micro- to be provided on a stack when tri-roll press machine processing is selected to prepare modified polystyrene light guide plate
Structure embosses, and can also be both provided with micro-structure embossing on two stacks, and the cross section of micro-structure embossing can be semicircle,
At least one of waveform and triangle.
In present invention further optimization embodiment, guide-lighting micro-structure embossing, Ling Yigen are provided on a pressure roller
Reflection micro-structure embossing is provided on pressure roller, so that being provided in a plate face of manufactured polystyrene light guide plate guide-lighting micro-
Structure burr is provided with reflection micro-structure burr in another plate face, so as to exist instead of the conventionally employed technology that is printed on one side
The technique of the plate face printing reflection micro-structure burr of polystyrene light guide plate, reduces environmental pollution, more can effectively promote
Into the cooperative development of economy and environment.
In the preferred embodiment of the present invention, plate forming system further includes cooler, and cooler is used to press
Prolong molding modified polystyrene light guide plate to be cooled down.
In order to accelerate the cooling velocity of the modified polystyrene light guide plate of calendering formation, in a kind of preferred implementation of the present invention
In mode, cooler is additionally provided in plate forming system, cooler is set to the rear end of calender, for changing for calendering formation
Property polystyrene light guide plate cooled down, it is preferred that select water-cooling cooler to the modified polystyrene light guide plate of calendering formation
It is cooled down.
In the preferred embodiment of the present invention, continous way modified polystyrene leaded light board production technology further includes step
Suddenly (s), step (s) is set between step (a) and step (b), step (s) be by modified polystyrene melt carry out devolatilization and
Filtration treatment.
By the way that modified polystyrene melt is carried out devolatilization processing, by low boiling component in modified polystyrene melt and
Oligomer component is removed, and oligomer component and low boiling component are detached, after oligomer component is removed, then it is right
Low boiling component is recycled, and reduces the waste of raw material.
In the present invention, oligomer component includes styrene oligomer, methyl methacrylate oligomer and two kinds of monomers
Copolymerized oligomer etc., low boiling component includes styrene monomer and methyl methacrylate monomer etc..
By the way that modified polystyrene melt is filtered processing, the impurity in modified polystyrene melt is removed,
To ensure the light efficiency performance of modified polystyrene light guide plate.
In the preferred embodiment of the present invention, the low boiling component emitted by devolatilization processing can carry out
It recycles, continues to be discharged into reaction kettle after cooling, polymerisation is carried out together with styrene monomer and methacrylic acid monomer,
It is energy saving to reduce the waste of raw material.The oligomer component in system is removed by trash eliminator, makes recycling cycle
Low boiling component is purer, avoids occurring xanthochromia substance in polymer.
In the preferred embodiment of the present invention, the top of reaction kettle is also communicated with surge tank, and surge tank is communicated with
Cooler is buffered, buffering cooler is communicated with vacuum system, and vacuum system is connected with low component cooler, in order to buffer
After the low component collected in tank is cooled down via low component cooler, it is discharged into reaction kettle recycles together.
In a preferred embodiment of the invention, vacuum system is by vacuum pump, PLC program control system, air accumulator, true
Vacant duct, vacuum valve, the complete vacuum system for overseas filtering the compositions such as assembly.
In a preferred embodiment of the invention, in step (a), the number of modified polystyrene melt polymerizeing is equal
Molecular weight is 5-20 ten thousand, preferably 10-15 ten thousand.
By the polymerisation for controlling styrene monomer and methyl methacrylate so that the modified polystyrene of generation
Number-average molecular weight is 5-20 ten thousand, so that the modified polystyrene light guide plate being prepared has good intensity and light transmittance,
Especially when the number-average molecular weight of modified polystyrene melt is 10-15 ten thousand, prepared by the modified polystyrene that forms it is guide-lighting
Plate has more excellent comprehensive performance.
In the preferred embodiment of the present invention, in step (b), the temperature for keeping the temperature conveying is 200-250 DEG C, excellent
It is selected as 220-230 DEG C.
In a preferred embodiment of the invention, the typical but non-limiting delivery temperature of modified polystyrene melt is
200th, 205,210,215,220,225,230,235,240,245 or 250 DEG C.
It is 200-250 DEG C to be controlled by the heat preservation delivery temperature that will be copolymerized the modified polystyrene melt formed, to avoid
There is the yellowing phenomenon that is carbonized in transmission process in modified polystyrene melt, influences the processing of follow-up plank and what is be prepared change
Property polystyrene light guide plate comprehensive performance, especially when the temperature of heat preservation conveying is 220-230 DEG C, the modification that is prepared
The comprehensive performance of polystyrene light guide plate is more preferably.
In the preferred embodiment of the present invention, in step (a), the polymerization temperature for carrying out binary copolymerization is 120-
180 DEG C, preferably 130-150 DEG C.
In the preferred embodiment of the present invention, the typical but non-limiting polymerization temperature of binary copolymerization is 120,
125th, 130,135,140,145,150,155,160,165,170,175 or 180 DEG C.
Temperature when carrying out binary copolymerization by controlling styrene monomer and methyl methacrylate monomer is 120-180
DEG C, so that the narrowly distributing of the molecular weight of the modified polystyrene melt of generation, excellent combination property especially work as polymerization temperature
It it is 130-150 DEG C, the molecular weight distribution of prepared modified polystyrene melt out is narrower, and comprehensive performance is more excellent.
According to another aspect of the present invention, the present invention provides above-mentioned continous way modified polystyrene light guide plates to produce work
The modified polystyrene light guide plate that skill is prepared, the thickness of the modified polystyrene light guide plate is 0.5-5mm, preferably 1-
3mm。
In the present invention, the thickness of modified polystyrene light guide plate can be adjusted according to the requirement of client, modified poly-
The typical but non-limiting thickness of styrene light guide plate as 0.5,0.6,0.7,0.8,0.9,1,1.2,1.5,1.8,2,
2.2nd, 2.5,2.8,3,3.2,3.5,3.8,4,4.2,4.5,4.8 or 5mm.
It is 0.5-5mm by the thickness for controlling modified polystyrene light guide plate, to keep good light transmission and refraction
Performance, to ensure the image quality clarity of various liquid crystal display devices, especially when the thickness of polystyrene light guide plate is 1-3mm
When, prepared by the refraction performance of modified polystyrene light guide plate that forms and light transmission more preferably.
In the preferred embodiment of the present invention, at least one plate face of modified polystyrene light guide plate is provided with micro-
Structure burr, the cross section of micro-structure burr are one kind in semicircle shape, wavy and triangular shape.
In order to improve modified polystyrene light guide plate outgoing light homogeneity, micro- knot is provided on modified polystyrene light guide plate
Structure burr, the cross section of micro-structure burr both can be semicircle shape, one kind in wavy or triangular shape or hemispherical
It is combined with triangular shape or hemispherical is combined with waveform, can also be that hemispherical, wavy and triangular shape is combined.
Modified polystyrene light guide plate provided by the invention can be provided with micro-structure burr with a plate face, can also be two
Plate face is both provided with micro-structure burr, i.e. a plate face is provided with guide-lighting micro-structure burr, and it is micro- that another plate face is provided with reflection
Structure burr.
Technical solution provided by the invention is further described with reference to embodiment and comparative example.
Embodiment 1
A kind of modified polystyrene light guide plate is present embodiments provided, is prepared according to following technique, as shown in Figure 1：
(a) styrene monomer and methyl methacrylate monomer are added in reaction kettle 101 and are uniformly mixed, two kinds of monomers
Mass ratio is 95:5, polymerisation is carried out, control polymerization temperature is 120 DEG C, and the modified polyphenyl second that number-average molecular weight is 50,000 is made
Alkene melt；
(s) passed sequentially through after modified polystyrene melt is discharged from reaction kettle 101 devolatilizer 102 and filter 103 into
Row devolatilization and filtration treatment, and the low boiling component emitted from devolatilizer 102 and oligomer component are first passed through into impurity point
Oligomer component is detached from device 115 and is removed, then low boiling component is delivered to after cooler 111 cools down, continues to be discharged into reaction
It is recycled in kettle 101；In addition, the top of reaction kettle 101 is also communicated with surge tank 112, surge tank 112 is communicated with buffering cooling
Device 113, buffering cooler 113 are communicated with vacuum system 114, and vacuum system 114 is connected with low component cooler 111, so as to
After the low component collected in surge tank 112 is cooled down via low component cooler 111, it is discharged into reaction kettle 101 and recycles together
It utilizes；
(b) the modified polystyrene melt after filtering is delivered to plate forming system in 200 DEG C of heat preservations, successively by
One mixer 104, gear pump 105, extrusion die 107, the second mixer 106, tri-roll press machine 108 and water-cooling cooler 109,
Thickness is obtained as 2mm modified polystyrene light guide plates, and modified polystyrene light guide plate is received by plank collecting box 110
Collection, wherein, waveform leaded light embossing is provided on a stack of tri-roll press machine 108, other two stack is minute surface
Smooth roll, the structure diagram of made modified polystyrene light guide plate is as shown in Fig. 2, from figure 2, it is seen that provided in this embodiment
It is wavy micro-structure bar shaped burr that modified polystyrene light guide plate, which has cross section,.
Embodiment 2
A kind of modified polystyrene light guide plate is present embodiments provided, is prepared according to following technique：
(a) styrene monomer and methyl methacrylate monomer are added in reaction kettle and carries out polymerisation, the matter of the two
Amount is than being 50:50, control polymerization temperature is 145 DEG C, and the modified polystyrene melt that number-average molecular weight is 200,000 is made；
(s) modified polystyrene melt is passed sequentially through into devolatilizer and filter and carries out devolatilization and filtration treatment, and will be from
The low boiling component emitted in devolatilizer and surge tank, which continues to be discharged into reaction kettle, to be recycled；
(b) the modified polystyrene melt after filtering is delivered to plate forming system successively by the in 230 DEG C of heat preservations
One mixer, gear pump, the second mixer, extrusion die, tri-roll press machine and water-cooling cooler, obtain thickness and change for 2mm
Property polystyrene light guide plate.Wherein, hemispherical leaded light embossing, other two pressure are provided on a stack of tri-roll press machine
Prolong roller as minute surface smooth roll, the structure diagram of made modified polystyrene light guide plate is as shown in figure 3, as can be seen from Figure 3, this reality
It is semicircular micro-structure dot burr to apply the modified polystyrene light guide plate of example offer to have cross section.
Embodiment 3
A kind of modified polystyrene light guide plate is present embodiments provided, is prepared according to following technique：
(a) styrene monomer and methyl methacrylate monomer are added in reaction kettle and carries out polymerisation, the matter of the two
Amount is than being 80:20, control polymerization temperature is 140 DEG C, and the modified polystyrene melt that number-average molecular weight is 100,000 is made；
(s) modified polystyrene melt is passed sequentially through into devolatilizer and filter and carries out devolatilization and filtration treatment, and will be from
The low boiling component emitted in devolatilizer and surge tank, which continues to be discharged into reaction kettle, to be recycled；
(b) the modified polystyrene melt after filtering is delivered to plate forming system in 220 DEG C of heat preservations, successively by
One mixer, gear pump, the second mixer, extrusion die, tri-roll press machine and water-cooling cooler, obtain thickness and change for 2mm
Property polystyrene light guide plate.Wherein, hemispherical leaded light embossing is provided on a stack of tri-roll press machine, another calendering
Corrugated guide-lighting embossing is provided on roller, remaining stack is minute surface smooth roll, and made modified polystyrene is guide-lighting
The structure diagram of plate, as shown in figure 4, as can be seen from Figure 4, one plate face tool of modified polystyrene light guide plate provided in this embodiment
Have with the micro-structure dot burr that cross section is semicircle shape, it is that wavy micro-structure bar shaped is convex that another plate face, which has cross section,
Line.
Embodiment 4
Present embodiments provide a kind of modified polystyrene light guide plate, the preparation process of the present embodiment and embodiment 3 is not
It is with part, the polystyrene monomers of reaction kettle is added in step (a) and the mass ratio of methyl methacrylate monomer is
55:45。
Embodiment 5
Present embodiments provide a kind of modified polystyrene light guide plate, the preparation process of the present embodiment and embodiment 3 is not
It is with part, the polystyrene monomers of reaction kettle is added in step (a) and the mass ratio of methyl methacrylate monomer is
60:40。
Embodiment 6
Present embodiments provide a kind of modified polystyrene light guide plate, the preparation process of the present embodiment and embodiment 3 is not
It is with part, the polystyrene monomers of reaction kettle is added in step (a) and the mass ratio of methyl methacrylate monomer is
99:1。
Embodiment 7
Present embodiments provide a kind of modified polystyrene light guide plate, the preparation process of the present embodiment and embodiment 3 is not
It is with part, the polystyrene monomers of reaction kettle is added in step (a) and the mass ratio of methyl methacrylate monomer is
30:70。
Comparative example 1
This comparative example provides a kind of thickness as 2mm modified polystyrene light guide plates, uses number-average molecular weight as 100,000
Polystyrene master batch is prepared with guide-lighting powder, and the mass ratio of polystyrene master batch and guide-lighting powder is 60：40, structure and embodiment
The 3 modified polystyrene light guide plates provided are identical.
Comparative example 2
This comparative example provides a kind of commercially available thickness as 2mm polymethacrylates light guide plates, and structure is carried with embodiment 3
The polystyrene light guide plate of confession is identical.
By the modified polystyrene light guide plate that embodiment 1-7 is provided and the polystyrene light guide plate that comparative example 1-2 is provided and
Polymethyl methacrylate light guide plate carry out light transmittance, light-emitting uniformity and rate of water absorption test, test result is as follows table 1
It is shown：
1 modified polystyrene light guide plate test result data table of table
| Light transmittance (%) | Rate of water absorption (%) | Plate face color | Light-emitting uniformity | |
| Embodiment 1 | 91.5 | 0.05% | Without yellow light | Uniform in light emission, non-crystal point |
| Embodiment 2 | 92.6 | 0.15% | Without yellow light | Uniform in light emission, non-crystal point |
| Embodiment 3 | 91.3 | 0.05% | Without yellow light | Uniform in light emission, non-crystal point |
| Embodiment 4 | 93.0 | 0.13% | Without yellow light | Uniform in light emission, non-crystal point |
| Embodiment 5 | 92.1 | 0.07% | Without yellow light | Uniform in light emission, non-crystal point |
| Embodiment 6 | 90.5 | 0.04% | Without yellow light | Uniform in light emission, non-crystal point |
| Embodiment 7 | 92.2 | 0.23% | Without yellow light | Uniform in light emission, non-crystal point |
| Comparative example 1 | 89.5 | 0.04% | Yellowing light | Light extraction is uneven, there is fisheye |
| Comparative example 2 | 93.1 | 0.35% | Without yellow light | Uniform in light emission, non-crystal point |
The performance data of the modified polystyrene light guide plate provided from 1 embodiment 1-7 of table can be seen that provided by the invention
The modified polystyrene light guide plate prepared using continous way modified polystyrene leaded light board production technology, light transmittance are more than 90%,
Without yellow light, non-crystal point, uniform in light emission can ensure the image quality clarity of liquid crystal display.
It can be seen that from the comparison of embodiment 1-5 and embodiment 6-7 when preparing modified polystyrene light guide plate, when poly-
The mass ratio of styrene monomer and methyl methacrylate monomer is (50-95)：When (5-50), made modified polystyrene
The light transmittance of light guide plate is above 91%, and rate of water absorption is less than 0.15%, and uniform in light emission non-crystal point, and comprehensive performance is more preferably.
It can be seen that by the comparison of embodiment 3-5 and embodiment 1-2 when preparing modified polystyrene light guide plate, when
The mass ratio of polystyrene monomers and methyl methacrylate monomer is (55-80)：When (20-45), modified polystyrene is led
The light transmission and dimensional stability comprehensive performance of tabula rasa are more preferably.
The performance data of the modified polystyrene light guide plate provided from 1 comparative example 1 of table can be seen that using conventional polyphenyl second
Polystyrene light guide plate its light transmittance that alkene master batch and guide-lighting powder Hybrid Heating fusion plastification are prepared is relatively low, and light extraction is uneven
Even, with the presence of fisheye, and yellowing light, comprehensive performance are poor.
The performance data of the polymethyl methacrylate light guide plate provided from 1 comparative example 2 of table can be seen that commercially available poly- first
The light transmittance and light-emitting uniformity of base methyl acrylate light guide plate are preferable, and without yellow light, but its rate of water absorption is higher than
0.3%, it under hot and humid environment, easily absorbs water, deforms upon, influence the normal use of liquid crystal display.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its according to
Can so modify to the technical solution recorded in foregoing embodiments either to which part or all technical features into
Row equivalent replacement；And these modifications or replacement, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of continous way modified polystyrene leaded light board production technology, which is characterized in that include the following steps：
(a) styrene monomer and methyl methacrylate monomer are added in reaction kettle and carries out binary copolymerization, modified polyphenyl is made
Ethylene melt；
(b) heat preservation of modified polystyrene melt is delivered to plate forming system, by plate forming system by modified polyphenyl second
Modified polystyrene light guide plate is made in alkene melt.
2. continous way modified polystyrene leaded light board production technology according to claim 1, which is characterized in that in step
(a) in, the mass ratio of the styrene monomer and methyl methacrylate monomer is (50-95)：(5-50), preferably (55-
80)：(20-45).
3. continous way modified polystyrene leaded light board production technology according to claim 1, which is characterized in that in step
(b) in, the plate forming system, including set gradually the first mixer, gear pump, the second mixer, extrusion die and
Calender；
Preferably；The calender includes at least two stacks, and micro-structure embossing is provided on an at least stack.
4. continous way modified polystyrene leaded light board production technology according to claim 3, which is characterized in that the plank
Formation system further includes cooler, and the cooler is used to cool down the modified polystyrene light guide plate of calendering formation.
5. according to claim 1-4 any one of them continous way modified polystyrene leaded light board production technologies, which is characterized in that
Step (s) is further included, the step (s) is set between the step (a) and step (b), and the step (s) is poly- for that will be modified
Styrene melt carries out devolatilization and filtration treatment.
6. according to claim 1-4 any one of them continous way modified polystyrene leaded light board production technologies, which is characterized in that
In step (a), the number-average molecular weight for the modified polystyrene polymerizeing is 5-20 ten thousand, preferably 10-15 ten thousand.
7. according to claim 1-4 any one of them continous way modified polystyrene leaded light board production technologies, which is characterized in that
In step (b), the temperature for keeping the temperature conveying is 200-250 DEG C, preferably 220-230 DEG C.
8. according to claim 1-4 any one of them continous way modified polystyrene leaded light board production technologies, which is characterized in that
In step (a), the polymerization temperature for carrying out binary copolymerization is 110-160 DEG C, preferably 130-150 DEG C.
9. changed according to what claim 1-8 any one of them continous way modified polystyrene leaded light board production technologies were prepared
Property polystyrene light guide plate, which is characterized in that the thickness of the modified polystyrene light guide plate be 0.5-5mm, preferably 1-
3mm。
10. polystyrene light guide plate according to claim 9, which is characterized in that the modified polystyrene light guide plate
At least one plate face is provided with micro-structure burr, and the cross section of the micro-structure burr is semicircle shape, wavy or triangular shape.
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| CN109725379A (en) * | 2018-11-23 | 2019-05-07 | 广东欧迪明光电科技股份有限公司 | A kind of light guide plate and its points distributing method |
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