CN108164630B - Continuous production process of modified polystyrene light guide plate and modified polystyrene light guide plate - Google Patents
Continuous production process of modified polystyrene light guide plate and modified polystyrene light guide plate Download PDFInfo
- Publication number
- CN108164630B CN108164630B CN201711456811.2A CN201711456811A CN108164630B CN 108164630 B CN108164630 B CN 108164630B CN 201711456811 A CN201711456811 A CN 201711456811A CN 108164630 B CN108164630 B CN 108164630B
- Authority
- CN
- China
- Prior art keywords
- light guide
- modified polystyrene
- guide plate
- polystyrene light
- polystyrene
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
The invention provides a continuous production process of a modified polystyrene light guide plate and the modified polystyrene light guide plate, which relate to the technical field of light guide plates and comprise the following steps: firstly, carrying out binary copolymerization on a styrene monomer and a methyl methacrylate monomer to prepare a modified polystyrene melt; the modified polystyrene melt is conveyed to a plate forming system in a heat preservation mode, and the modified polystyrene melt is prepared into a modified polystyrene light guide plate through the plate forming system, so that the technical problems that the existing polystyrene light guide plate is formed by heating, melting and plasticizing polystyrene master batches and light guide powder, crystal points formed by stiff materials and partially carbonized polystyrene exist on the polystyrene light guide plate, so that the light emitting is uneven, the light transmittance is low, and the plate surface is yellow are solved.
Description
Technical Field
The invention relates to the technical field of light guide plate production processes, in particular to a continuous modified polystyrene light guide plate production process and a modified polystyrene light guide plate.
Background
As the industrial society develops into a highly information-oriented society, electronic display devices serving as media for displaying and transmitting various information are increasingly important. Particularly, liquid crystal display devices combining liquid crystal and semiconductor technologies are widely used in various fields, but liquid crystals of the liquid crystal display devices cannot emit light, and a light source needs to be arranged behind the devices, and a linear light source needs to be converted into a surface light source through a light guide plate, so that the devices can uniformly emit light, and a display effect is achieved.
The traditional light guide plate is mostly prepared from polymethyl methacrylate, however, the polymethyl methacrylate is very fragile to moisture due to the special chemical structure of the polymethyl methacrylate, so that the light guide plate made of the polymethyl methacrylate has poor dimensional stability under a high-temperature and high-humidity environment, is easy to bend, and influences the display effect of the liquid crystal display device.
Now someone has researched and developed the polystyrene light guide plate, but the luminousness of polystyrene light guide plate is lower, in order to improve the luminousness of polystyrene light guide plate, need to make the polystyrene light guide plate after mixing melting plastify light guide powder and polystyrene master batch, but the polystyrene master batch is in the course of working, it is even to hardly plasticize the melting, and partial polystyrene can carbonize in the plastify process, make not only have the crystal point that the insufficient plastify of trace and formed on the polystyrene light guide plate, and because the existence of partial carbonization polystyrene makes the face yellow, it is inhomogeneous to lead to its light-emitting, the luminousness is poor, can't guarantee liquid crystal display device's image definition.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
One of the objectives of the present invention is to provide a production process of a modified polystyrene light guide plate, so as to alleviate the technical problems that the existing polystyrene light guide plate is formed by mixing and processing polystyrene master batches and light guide powder, but the polystyrene master batches are difficult to plasticize and melt uniformly in the processing process, and part of polystyrene is carbonized in the plasticizing process, so that the polystyrene light guide plate has not only crystal points formed by a trace of insufficiently plasticized rigid material, but also the plate surface is yellowed due to the presence of part of carbonized polystyrene, so that the light emission is not uniform, the light transmittance is poor, and the definition of the image quality of a liquid crystal display device cannot be ensured.
The invention provides a production process of a modified polystyrene light guide plate, which comprises the following steps:
(a) adding a styrene monomer and a methyl methacrylate monomer into a reaction kettle for binary copolymerization to prepare a modified polystyrene melt;
(b) and (3) conveying the modified polystyrene melt to a plate forming system in a heat preservation manner, and preparing the modified polystyrene melt into the modified polystyrene light guide plate through the plate forming system.
Further, in the step (a), the mass ratio of the styrene monomer to the methyl methacrylate monomer is (50-95): (5-50), preferably (55-80): (20-45).
Further, in the step (b), the plate forming system comprises a first mixer, a gear pump, a second mixer, an extrusion die head and a calender which are sequentially arranged;
preferably, the calender comprises at least two calendering rollers, and at least one calendering roller is provided with the microstructure embossing.
Further, the plate forming system further comprises a cooler, and the cooler is used for cooling the modified polystyrene light guide plate formed by rolling.
Further, the continuous production process of the modified polystyrene light guide plate further comprises a step(s), wherein the step(s) is arranged between the step (a) and the step (b), and the step(s) is to perform devolatilization and filtration treatment on the modified polystyrene melt.
Further, in the step (a), the modified polystyrene obtained by the polymerization has a number average molecular weight of 5 to 20 ten thousand, preferably 10 to 15 ten thousand.
Further, in the step (b), the temperature for heat preservation and transportation is 200-.
Further, in the step (a), the polymerization temperature for binary copolymerization is 110-.
The second purpose of the present invention is to provide a modified polystyrene light guide plate prepared by the continuous modified polystyrene light guide plate production process, wherein the thickness of the modified polystyrene light guide plate is 0.5-5mm, preferably 1-3 mm.
Furthermore, at least one plate surface of the modified polystyrene light guide plate is provided with a microstructure convex pattern, and the cross section of the microstructure convex pattern is semicircular, wavy or triangular.
The modified polystyrene light guide plate provided by the invention is prepared by copolymerizing a styrene monomer and a methyl methacrylate monomer, and the copolymerized modified polystyrene melt is directly prepared into the modified polystyrene light guide plate, so that plasticizing processing is not required, the modified polystyrene light guide plate eliminates crystal points formed by trace insufficiently plasticized rigid materials, the problem that the modified polystyrene light guide plate yellows due to carbonization of part of modified polystyrene caused by plasticizing processing is also avoided, the prepared modified polystyrene light guide plate has uniform light emitting, high light transmittance and low water absorption, and the image quality display definition of a liquid crystal display device is ensured.
In addition, the continuous production process of the modified polystyrene light guide plate provided by the invention reduces the processing preparation and melting plasticizing process of the polystyrene master batch, saves a large amount of energy consumption, and reduces the production cost of the modified polystyrene light guide plate.
The modified polystyrene light guide plate provided by the invention has the advantages of uniform light emission, no yellow light, high transmittance and low water absorption, can keep good dimensional stability, and ensures the image quality definition of a liquid crystal display device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flow chart of a production process of a continuous modified polystyrene light guide plate according to embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a modified polystyrene light guide plate provided in embodiment 1;
fig. 3 is a schematic structural view of a modified polystyrene light guide plate provided in embodiment 2;
fig. 4 is a schematic structural diagram of a modified polystyrene light guide plate provided in embodiment 3.
Icon: 101-a reaction kettle; 102-a devolatilizer; 103-a filter; 104-a first mixer; 105-gear pump; 106-a second mixer; 107-extrusion die; 108-three-roll calender; 109-water-cooled cooler; 110-a sheet collection box; 111-low composition cooler; 112-a buffer tank; 113-buffer cooler; 114-a vacuum system; 115-impurity separator.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The traditional light guide plate is mostly prepared from polymethyl methacrylate, however, the polymethyl methacrylate is very fragile to moisture due to the special chemical structure of the polymethyl methacrylate, so that the light guide plate made of the polymethyl methacrylate has poor dimensional stability under high-temperature and high-humidity environments, is easy to bend, and influences the picture display effect and the service life of the liquid crystal display device.
Now, some people have developed a polystyrene light guide plate, firstly, polystyrene is polymerized into polystyrene through a styrene monomer, then polystyrene is processed into polystyrene master batches, finally, the polystyrene master batches and light guide powder are mixed and then heated, melted and plasticized to be processed into the polystyrene light guide plate, but in the engineering of heating, melting and plasticizing of the polystyrene master batches, all the polystyrene master batches are difficult to ensure to be heated uniformly and completely melted, so that small rigid materials which are partially not completely melted exist on the polystyrene light guide plate frequently, and part of polystyrene can be carbonized in the plasticizing process, so that the transmission effect of the polystyrene light guide plate is poor, crystal points formed by a plurality of rigid materials exist, the plate surface becomes yellow, and the definition of the image quality of a liquid crystal display device cannot be ensured.
According to one aspect of the present invention, the present invention provides a production process of a modified polystyrene light guide plate, comprising the steps of:
(a) adding a styrene monomer and a methyl methacrylate monomer into a reaction kettle for binary copolymerization to prepare a modified polystyrene melt;
(b) and (3) conveying the modified polystyrene melt to a plate forming system in a heat preservation manner, and preparing the modified polystyrene melt into the modified polystyrene light guide plate through the plate forming system.
In the invention, the modified polystyrene melt is prepared by copolymerizing methyl methacrylate and styrene monomer, so that the modified polystyrene melt has the dual advantages of polystyrene and polymethyl methacrylate, has the low moisture absorption rate and good dimensional stability of polystyrene, has the light transmittance of polymethyl methacrylate, and can effectively ensure the image definition of a liquid crystal display device.
The modified polystyrene light guide plate provided by the invention is prepared by copolymerizing a styrene monomer and a methyl methacrylate monomer, and the copolymerized modified polystyrene melt is directly prepared into the modified polystyrene light guide plate, so that plasticizing processing is not required, the modified polystyrene light guide plate eliminates crystal points formed by trace insufficiently plasticized rigid materials, the problem that the modified polystyrene light guide plate yellows due to carbonization of part of modified polystyrene caused by plasticizing processing is also avoided, the prepared modified polystyrene light guide plate has uniform light emitting, high light transmittance and low water absorption, and the image quality display definition of a liquid crystal display device is ensured.
In addition, the continuous production process of the modified polystyrene light guide plate provided by the invention reduces the processing preparation and melting plasticizing process of the polystyrene master batch, saves a large amount of energy consumption, and reduces the production cost of the modified polystyrene light guide plate.
In a preferred embodiment of the present invention, in the step (a), the mass ratio of the styrene monomer to the methyl methacrylate monomer is (50 to 95): (5-50), preferably (55-80): (20-45).
In a typical but non-limiting embodiment of the invention, the mass ratio of styrene monomer to methyl methacrylate monomer is 50:50, 55:45, 60:40, 65:35, 70:30, 75:25, 80:20, 85:15, 90:10, 95: 5.
In the polymerization preparation of the modified polystyrene, in order to control the performance of the modified polystyrene, the mass ratio of the styrene monomer to the methyl methacrylate monomer needs to be controlled to be (50-95): (5-50) to ensure that the prepared modified polystyrene light guide plate has good light transmission and refraction properties and good dimensional stability, and especially when the mass ratio of the styrene monomer to the methyl methacrylate monomer is (55-80): (20-45), the resulting modified polystyrene light guide plate has more excellent overall properties.
In a preferred embodiment of the present invention, in the step (b), the sheet forming system comprises a first mixer, a gear pump, a second mixer, an extrusion die and a calender which are arranged in sequence;
preferably, the calender comprises at least two calendering rollers, and at least one calendering roller is provided with the microstructure embossing.
In the preferred embodiment of the invention, the first mixer, the gear pump, the second mixer and the extrusion die head are communicated in sequence, the first mixer is used for mixing the modified polystyrene melt for the first time, the input end of the gear pump is communicated with the first mixer, the gear pump conveys the modified polystyrene melt by means of the change and movement of the working volume formed between the pump cylinder and the meshing gear, and the modified polystyrene melt is conveyed by adopting the gear pump, so that the modified polystyrene melt is extruded mutually by the meshing gear of the gear pump, and the secondary mixing is more uniform; the second mixer is communicated with the output end of the gear pump, and the modified polystyrene melt after extrusion and mixing by the gear pump enters the second mixer for mixing for three times so as to ensure that the modified polystyrene melt entering the extrusion die head is mixed more uniformly. The extrusion die head is used for extruding the modified polystyrene melt after the three times of mixing through the extrusion die head, and the calender is used for calendering and molding the modified polystyrene melt to prepare the modified polystyrene light guide plate.
In a further preferred embodiment of the invention, the calender comprises at least two calendering rolls, wherein at least one calendering roll is provided with light-guiding embossments.
In order to improve the light-emitting uniformity of the modified polystyrene light guide plate, the microstructure embosses need to be arranged on the modified polystyrene light guide plate, and therefore, in a preferred embodiment of the invention, the microstructure embosses are arranged on the calendering rollers, so that the prepared modified polystyrene light guide plate is provided with the microstructure embosses.
In a typical but non-limiting embodiment of the invention, the calender may be a two-roll calender or a three-roll calender, preferably a three-roll calender.
When a three-roller calender is selected for processing and preparing the modified polystyrene light guide plate, one calender roller can be provided with the microstructure embossing, two calender rollers can be provided with the microstructure embossing, and the cross section of the microstructure embossing can be at least one of semicircular, wave and triangular.
In a further preferred embodiment of the present invention, one of the pressing rollers is provided with a light guide microstructure embossing, and the other pressing roller is provided with a reflection microstructure embossing, so that one plate surface of the manufactured polystyrene light guide plate is provided with a light guide microstructure relief, and the other plate surface is provided with a reflection microstructure relief, thereby replacing the traditional process of printing the reflection microstructure relief on one plate surface of the polystyrene light guide plate by using a single-sided printing technology, reducing environmental pollution, and more effectively promoting the synergistic development of economy and environment.
In a preferred embodiment of the present invention, the sheet material forming system further includes a cooler for cooling the modified polystyrene light guide plate that is calender-formed.
In order to increase the cooling speed of the modified polystyrene light guide plate formed by rolling, in a preferred embodiment of the present invention, the plate forming system is further provided with a cooler, the cooler is disposed at the rear end of the rolling machine and is used for cooling the modified polystyrene light guide plate formed by rolling, and preferably, a water-cooled cooler is selected to cool the modified polystyrene light guide plate formed by rolling.
In a preferred embodiment of the present invention, the continuous production process of the modified polystyrene light guide plate further comprises a step(s) disposed between the step (a) and the step (b), wherein the step(s) is to devolatilize and filter the modified polystyrene melt.
The low-boiling-point components and the low-boiling-point components in the modified polystyrene melt are removed by devolatilizing the modified polystyrene melt, the low-boiling-point components and the low-boiling-point components are separated, and the low-boiling-point components are recovered after the low-boiling-point components are removed, so that the waste of raw materials is reduced.
In the present invention, the oligomer component includes styrene oligomer, methyl methacrylate oligomer, and a co-oligomer of two monomers, etc., and the low boiling point component includes styrene monomer, methyl methacrylate monomer, etc.
The modified polystyrene melt is filtered to remove impurities in the modified polystyrene melt, so that the light efficiency performance of the modified polystyrene light guide plate is ensured.
In a preferred embodiment of the present invention, the low boiling point component discharged by the devolatilization process can be recycled, cooled and continuously discharged into the reaction kettle, and the low boiling point component and the styrene monomer and the methacrylic acid monomer are polymerized together to reduce the waste of raw materials and save energy. The low-boiling-point components in the system are removed through the impurity separator, so that the recycled low-boiling-point components are purer, and yellowing substances in the polymer are avoided.
In a preferred embodiment of the present invention, the top of the reaction kettle is further communicated with a buffer tank, the buffer tank is communicated with a buffer cooler, the buffer cooler is communicated with a vacuum system, and the vacuum system is communicated with the low component cooler, so that the low component collected in the buffer tank is cooled by the low component cooler and then is discharged into the reaction kettle for recycling.
In the preferred embodiment of the present invention, the vacuum system is a vacuum system set consisting of a vacuum pump, a P L C program control system, an air storage tank, vacuum pipes, vacuum valves, an overseas filtration assembly, etc.
In a preferred embodiment of the present invention, the melt of the modified polystyrene obtained by polymerization in step (a) has a number average molecular weight of from 5 to 20 ten thousand, preferably from 10 to 15 ten thousand.
The polymerization reaction of styrene monomer and methyl methacrylate is controlled, so that the number average molecular weight of the generated modified polystyrene is 5-20 ten thousand, the prepared modified polystyrene light guide plate has good strength and light transmittance, and especially when the number average molecular weight of the modified polystyrene melt is 10-15 ten thousand, the prepared modified polystyrene light guide plate has more excellent comprehensive performance.
In a preferred embodiment of the present invention, in step (b), the temperature of the heat-preservation delivery is 200-.
In a preferred embodiment of the invention, typical but non-limiting delivery temperatures for the modified polystyrene melt are 200, 205, 210, 215, 220, 225, 230, 235, 240, 245 or 250 ℃.
The heat-preservation conveying temperature of the copolymerized modified polystyrene melt is controlled to be 200-250 ℃, so that the phenomenon of carbonization and yellowing of the modified polystyrene melt in the conveying process is avoided, the subsequent processing of the plate and the comprehensive performance of the prepared modified polystyrene light guide plate are influenced, and particularly when the heat-preservation conveying temperature is 220-230 ℃, the comprehensive performance of the prepared modified polystyrene light guide plate is better.
In a preferred embodiment of the present invention, in step (a), the polymerization temperature for carrying out the binary copolymerization is 120-180 ℃, preferably 130-150 ℃.
Typical, but non-limiting, polymerization temperatures for binary copolymerization in this preferred embodiment of the invention are 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175 or 180 ℃.
The temperature of binary copolymerization of the styrene monomer and the methyl methacrylate monomer is controlled to be 120-180 ℃, so that the molecular weight distribution of the generated modified polystyrene melt is narrow, the comprehensive performance is excellent, and particularly, when the polymerization temperature is 130-150 ℃, the molecular weight distribution of the prepared modified polystyrene melt is narrower, and the comprehensive performance is more excellent.
According to another aspect of the present invention, the present invention provides a modified polystyrene light guide plate prepared by the above continuous production process for a modified polystyrene light guide plate, wherein the thickness of the modified polystyrene light guide plate is 0.5-5mm, preferably 1-3 mm.
In the present invention, the thickness of the modified polystyrene light guide plate can be adjusted according to the requirements of customers, and typical but non-limiting thicknesses of the modified polystyrene light guide plate are, for example, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.2, 4.5, 4.8 or 5 mm.
The thickness of the modified polystyrene light guide plate is controlled to be 0.5-5mm so as to keep good light transmission performance and refraction performance and ensure the definition of image quality of various liquid crystal display devices, and particularly when the thickness of the polystyrene light guide plate is 1-3mm, the refraction performance and the light transmission performance of the modified polystyrene light guide plate prepared by the modified polystyrene light guide plate are better.
In a preferred embodiment of the present invention, at least one plate surface of the modified polystyrene light guide plate is provided with a micro-structured ridge having one of a semicircular, a wavy and a triangular cross-section.
In order to improve the light emergent uniformity of the modified polystyrene light guide plate, the modified polystyrene light guide plate is provided with a microstructure wale, and the cross section of the microstructure wale can be one of a semi-circle shape, a wave shape and a triangle shape, can also be combined with a semi-circle shape and a triangle shape, or can be combined with a semi-circle shape, a wave shape and a triangle shape.
The modified polystyrene light guide plate provided by the invention can be provided with the microstructure wales on one plate surface, and can also be provided with the microstructure wales on two plate surfaces, namely one plate surface is provided with the light guide microstructure wales, and the other plate surface is provided with the reflection microstructure wales.
The technical solution provided by the present invention is further described below with reference to examples and comparative examples.
Example 1
The embodiment provides a modified polystyrene light guide plate, which is prepared according to the following process, as shown in fig. 1:
(a) adding a styrene monomer and a methyl methacrylate monomer into a reaction kettle 101, uniformly mixing, wherein the mass ratio of the two monomers is 95:5, carrying out polymerization reaction, and controlling the polymerization temperature to be 120 ℃ to prepare a modified polystyrene melt with the number average molecular weight of 5 ten thousand;
(s) discharging the modified polystyrene melt from the reaction kettle 101, sequentially passing through a devolatilization device 102 and a filter 103 for devolatilization and filtration treatment, separating and removing low-boiling-point components and oligomer components discharged from the devolatilization device 102 through an impurity separator 115, conveying the low-boiling-point components to a cooler 111 for cooling, and continuously discharging into the reaction kettle 101 for recycling; in addition, the top of the reaction kettle 101 is also communicated with a buffer tank 112, the buffer tank 112 is communicated with a buffer cooler 113, the buffer cooler 113 is communicated with a vacuum system 114, and the vacuum system 114 is communicated with the low component cooler 111, so that the low components collected in the buffer tank 112 are cooled by the low component cooler 111 and then are discharged into the reaction kettle 101 for recycling;
(b) the filtered modified polystyrene melt is insulated and conveyed to a plate forming system at 200 ℃, and sequentially passes through a first mixer 104, a gear pump 105, an extrusion die head 107, a second mixer 106, a three-roll calender 108 and a water-cooling cooler 109 to prepare a modified polystyrene light guide plate with the thickness of 2mm, and the modified polystyrene light guide plate is collected through a plate collecting box 110, wherein one calendering roll of the three-roll calender 108 is provided with a wavy light guide embossing, the other two calendering rolls are mirror smooth rolls, the structural schematic diagram of the prepared modified polystyrene light guide plate is shown in fig. 2, and as seen from fig. 2, the modified polystyrene light guide plate provided by the embodiment has a microstructure bar-shaped convex pattern with a wavy cross section.
Example 2
The embodiment provides a modified polystyrene light guide plate, which is prepared according to the following process:
(a) adding a styrene monomer and a methyl methacrylate monomer into a reaction kettle for polymerization reaction, wherein the mass ratio of the styrene monomer to the methyl methacrylate monomer is 50:50, the polymerization temperature is controlled to be 145 ℃, and a modified polystyrene melt with the number average molecular weight of 20 ten thousand is prepared;
(s) carrying out devolatilization and filtration treatment on the modified polystyrene melt sequentially through a devolatilization device and a filter, and continuously discharging low-boiling-point components discharged from the devolatilization device and a buffer tank into a reaction kettle for recycling;
(b) and conveying the filtered modified polystyrene melt to a plate forming system at 230 ℃ for heat preservation, and sequentially passing through a first mixer, a gear pump, a second mixer, an extrusion die head, a three-roller calender and a water-cooling cooler to obtain the modified polystyrene light guide plate with the thickness of 2 mm. Wherein, one of the calendering rollers of the three-roller calender is provided with a hemispherical light guide embossing, and the other two calendering rollers are mirror smooth rollers, the structural schematic diagram of the manufactured modified polystyrene light guide plate is shown in fig. 3, and as seen from fig. 3, the modified polystyrene light guide plate provided by the embodiment has a microstructure point-shaped convex pattern with a semicircular cross section.
Example 3
The embodiment provides a modified polystyrene light guide plate, which is prepared according to the following process:
(a) adding a styrene monomer and a methyl methacrylate monomer into a reaction kettle for polymerization reaction, wherein the mass ratio of the styrene monomer to the methyl methacrylate monomer is 80:20, the polymerization temperature is controlled at 140 ℃, and a modified polystyrene melt with the number average molecular weight of 10 ten thousand is prepared;
(s) carrying out devolatilization and filtration treatment on the modified polystyrene melt sequentially through a devolatilization device and a filter, and continuously discharging low-boiling-point components discharged from the devolatilization device and a buffer tank into a reaction kettle for recycling;
(b) and (3) conveying the filtered modified polystyrene melt to a plate forming system at 220 ℃ for heat preservation, and sequentially passing through a first mixer, a gear pump, a second mixer, an extrusion die head, a three-roll calender and a water-cooling cooler to obtain the modified polystyrene light guide plate with the thickness of 2 mm. Wherein, be provided with hemisphere leaded light impressed watermark on one calendering roller of three-roller calender, be provided with wavy leaded light impressed watermark on another calendering roller, other one calendering roller is mirror surface smooth roll, the structural schematic diagram of the modified polystyrene light guide plate who makes, as shown in fig. 4, see from fig. 4, a face of the modified polystyrene light guide plate that this embodiment provided has the micro-structure point shape burr that the cross section is semicircle-shaped, and another face has the cross section and is wavy micro-structure bar burr.
Example 4
This example provides a modified polystyrene light guide plate, and differs from the preparation process of example 3 in that the mass ratio of the polystyrene monomer and the methyl methacrylate monomer added to the reaction kettle in step (a) is 55: 45.
Example 5
This example provides a modified polystyrene light guide plate, and differs from the preparation process of example 3 in that the mass ratio of the polystyrene monomer and the methyl methacrylate monomer added to the reaction kettle in step (a) is 60: 40.
Example 6
This example provides a modified polystyrene light guide plate, and differs from the preparation process of example 3 in that the mass ratio of the polystyrene monomer and the methyl methacrylate monomer added to the reaction kettle in step (a) is 99: 1.
Example 7
This example provides a modified polystyrene light guide plate, and differs from the preparation process of example 3 in that the mass ratio of the polystyrene monomer and the methyl methacrylate monomer added to the reaction kettle in step (a) is 30: 70.
Comparative example 1
The comparative example provides a modified polystyrene light guide plate with the thickness of 2mm, which is prepared from polystyrene master batches with the number-average molecular weight of 10 ten thousand and light guide powder, wherein the mass ratio of the polystyrene master batches to the light guide powder is 60:40, the structure is the same as that of the modified polystyrene light guide plate provided in example 3.
Comparative example 2
This comparative example provides a commercially available polymethacrylate light guide plate having a thickness of 2mm and the structure is the same as the polystyrene light guide plate provided in example 3.
The modified polystyrene light guide plates provided in examples 1 to 7 and the polystyrene light guide plates and the polymethyl methacrylate light guide plates provided in comparative examples 1 to 2 were subjected to light transmittance, light emission uniformity, and moisture absorption rate tests, and the test results are shown in table 1 below:
table 1 modified polystyrene light guide plate test result data table
| Light transmittance (%) | Water absorption rate (%) | Color of board surface | Uniformity of light emission | |
| Example 1 | 91.5 | 0.05％ | Without yellow light | Uniform light output and no crystal point |
| Example 2 | 92.6 | 0.15％ | Without yellow light | Uniform light output and no crystal point |
| Example 3 | 91.3 | 0.05％ | Without yellow light | Uniform light output and no crystal point |
| Example 4 | 93.0 | 0.13％ | Without yellow light | Uniform light output and no crystal point |
| Example 5 | 92.1 | 0.07％ | Without yellow light | Uniform light output and no crystal point |
| Example 6 | 90.5 | 0.04％ | Without yellow light | Uniform light output and no crystal point |
| Example 7 | 92.2 | 0.23％ | Without yellow light | Uniform light output and no crystal point |
| Comparative example 1 | 89.5 | 0.04％ | Yellow light | Uneven light emission and crystal points |
| Comparative example 2 | 93.1 | 0.35％ | Without yellow light | Uniform light output and no crystal point |
As can be seen from the performance data of the modified polystyrene light guide plates provided in examples 1 to 7 in table 1, the modified polystyrene light guide plate prepared by the continuous modified polystyrene light guide plate production process provided by the invention has a light transmittance of more than 90%, no yellow light, no crystal point, uniform light emission, and capability of ensuring the image quality definition of a liquid crystal display.
As can be seen from the comparison of examples 1 to 5 with examples 6 to 7, when the modified polystyrene light guide plate is prepared, when the mass ratio of the polystyrene monomer to the methyl methacrylate monomer is (50 to 95): (5-50), the light transmittance of the prepared modified polystyrene light guide plate is higher than 91%, the moisture absorption rate is less than 0.15%, the light is uniform and has no crystal points, and the comprehensive performance is better.
As can be seen from the comparison of examples 3-5 with examples 1-2, when the modified polystyrene light guide plate is prepared, the mass ratio of the polystyrene monomer to the methyl methacrylate monomer is (55-80): (20-45), the modified polystyrene light guide plate has better comprehensive performance of light transmission performance and dimensional stability.
It can be seen from the performance data of the modified polystyrene light guide plate provided in comparative example 1 in table 1 that the polystyrene light guide plate prepared by mixing, heating, melting and plasticizing the conventional polystyrene master batch and the light guide powder has low light transmittance, uneven light emission, existence of crystal points, yellow light and poor comprehensive performance.
As can be seen from the performance data of the polymethyl methacrylate light guide plate provided in comparative example 2 in Table 1, the light transmittance and the light-emitting uniformity of the commercially available polymethyl methacrylate light guide plate are good, and no yellow light exists, but the moisture absorption rate is higher than 0.3%, and the light guide plate is very easy to absorb water and deform under the high-temperature and high-humidity environment, so that the normal use of the liquid crystal display is influenced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (13)
1. A production process of a continuous modified polystyrene light guide plate is characterized by comprising the following steps:
(a) adding a styrene monomer and a methyl methacrylate monomer into a reaction kettle for binary copolymerization to prepare a modified polystyrene melt;
(b) conveying the modified polystyrene melt to a plate forming system in a heat preservation manner, and preparing the modified polystyrene melt into a modified polystyrene light guide plate through the plate forming system;
in the step (a), the mass ratio of the styrene monomer to the methyl methacrylate monomer is (55-80): (20-45);
the plate forming system comprises a first mixer, a gear pump, a second mixer, an extrusion die head and a calender which are sequentially arranged.
2. The production process of the continuous modified polystyrene light guide plate according to claim 1, wherein the calender comprises at least two calendering rollers, and at least one calendering roller is provided with the microstructure embossing.
3. The continuous production process of the modified polystyrene light guide plate according to claim 2, wherein the plate forming system further comprises a cooler for cooling the modified polystyrene light guide plate formed by calendering.
4. The continuous production process of the modified polystyrene light guide plate according to any one of claims 1 to 3, further comprising a step(s) disposed between the step (a) and the step (b), wherein the step(s) is a process of devolatilizing and filtering the modified polystyrene melt.
5. The continuous modified polystyrene light guide plate production process of any one of claims 1 to 3, wherein in the step (a), the modified polystyrene obtained by polymerization has a number average molecular weight of 5 to 20 ten thousand.
6. The continuous production process of a modified polystyrene light guide plate according to claim 5, wherein in the step (a), the number average molecular weight of the modified polystyrene obtained by polymerization is 10 to 15 ten thousand.
7. The process for producing a continuous modified polystyrene light guide plate as claimed in any one of claims 1 to 3, wherein the temperature for the heat-preservation conveying in the step (b) is 200-250 ℃.
8. The process as claimed in claim 6, wherein the temperature of the heat-preserving and transporting step (b) is 220-230 ℃.
9. The process for producing a continuous modified polystyrene light guide plate as claimed in any one of claims 1 to 3, wherein the polymerization temperature for the binary copolymerization in the step (a) is 110-160 ℃.
10. The process for producing a continuous modified polystyrene light guide plate as claimed in claim 9, wherein the polymerization temperature for the binary copolymerization in step (a) is 130-150 ℃.
11. The modified polystyrene light guide plate prepared by the continuous modified polystyrene light guide plate production process according to any one of claims 1 to 10, wherein the thickness of the modified polystyrene light guide plate is 0.5 to 5 mm.
12. The modified polystyrene light guide plate prepared by the continuous modified polystyrene light guide plate production process according to claim 11, wherein the thickness of the modified polystyrene light guide plate is 1-3 mm.
13. The polystyrene light guide plate of claim 11, wherein at least one plate surface of the modified polystyrene light guide plate is provided with a micro-structured ridge, and the cross section of the micro-structured ridge is semicircular, wavy or triangular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711456811.2A CN108164630B (en) | 2017-12-28 | 2017-12-28 | Continuous production process of modified polystyrene light guide plate and modified polystyrene light guide plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711456811.2A CN108164630B (en) | 2017-12-28 | 2017-12-28 | Continuous production process of modified polystyrene light guide plate and modified polystyrene light guide plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108164630A CN108164630A (en) | 2018-06-15 |
| CN108164630B true CN108164630B (en) | 2020-07-24 |
Family
ID=62519332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711456811.2A Active CN108164630B (en) | 2017-12-28 | 2017-12-28 | Continuous production process of modified polystyrene light guide plate and modified polystyrene light guide plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108164630B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109725379B (en) * | 2018-11-23 | 2024-01-12 | 广东欧迪明光电科技股份有限公司 | Light guide plate and point distribution method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1957002A (en) * | 2004-05-31 | 2007-05-02 | 三菱瓦斯化学株式会社 | Thermoplastic transparent resin |
| CN104943113A (en) * | 2015-05-29 | 2015-09-30 | 重庆鑫翎创福光电科技股份有限公司 | MS printing-free light guide plate production method and MS printing-free light guide plate |
| CN105111655A (en) * | 2015-09-16 | 2015-12-02 | 梁志勇 | Light guide plate manufacturing technological process system |
-
2017
- 2017-12-28 CN CN201711456811.2A patent/CN108164630B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1957002A (en) * | 2004-05-31 | 2007-05-02 | 三菱瓦斯化学株式会社 | Thermoplastic transparent resin |
| CN104943113A (en) * | 2015-05-29 | 2015-09-30 | 重庆鑫翎创福光电科技股份有限公司 | MS printing-free light guide plate production method and MS printing-free light guide plate |
| CN105111655A (en) * | 2015-09-16 | 2015-12-02 | 梁志勇 | Light guide plate manufacturing technological process system |
Non-Patent Citations (1)
| Title |
|---|
| "高散射导光有机玻璃的制备与光散射性能";高峰等;《塑料工业》;19971231(第四期);69-71,87页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108164630A (en) | 2018-06-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101308222B (en) | Optical sheet manufacture method and optical sheet | |
| CN101432642B (en) | Retardation film and method for production thereof | |
| CN108164630B (en) | Continuous production process of modified polystyrene light guide plate and modified polystyrene light guide plate | |
| CN101470230A (en) | Light conducting plate carved by laser impulse and method for producing the same | |
| KR20110112235A (en) | Laminated double-sided light guide plate | |
| CN102540318A (en) | Optical sheet manufactured with patterned rollers | |
| CN101493536A (en) | Light diffuser plate and method for producing the same | |
| CN101801644A (en) | Process for producing phase difference film of thermoplastic resin | |
| KR20110112233A (en) | Double-sided light guide plate manufactured with patterned rollers | |
| CN105111655B (en) | A kind of light guide plate fabrication processing system | |
| Huang et al. | Fast fabrication of integrated surface-relief and particle-diffusing plastic diffuser by use of a hybrid extrusion roller embossing process | |
| CN108164626B (en) | Continuous production process of polystyrene diffusion plate and polystyrene diffusion plate | |
| CN102385100A (en) | Optical sheet manufactured with micro-patterned carrier | |
| KR20110112225A (en) | Thin double-sided light guide plate | |
| KR20110112232A (en) | Printed double sided light guide plate | |
| CN102081176A (en) | Light dispersion plate | |
| CN102279432A (en) | Double-sided light guide plate manufactured with micro-patterned carrier | |
| JP2011098479A (en) | Method for manufacturing optical sheet having rugged shape on surface | |
| CN108189437B (en) | Continous way polystyrene leaded light board production technology and polystyrene light guide plate | |
| CN102385101A (en) | Optical sheet having thin double-sided light guide | |
| CN102049863A (en) | Method for producing resin sheet transferring surface shape | |
| WO2011115111A1 (en) | Method for manufacturing optical sheet | |
| EP2803457B1 (en) | Method for producing a transparent polycarbonate resin pellet | |
| CN203063231U (en) | Polycarbonate sheet material processing device for touch screen panel | |
| JP2011245624A (en) | Method for manufacturing optical film |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 300452, Lingang Economic Zone, Binhai New Area, Tianjin, No. 1 Applicant after: Tianjin rentai New Material Co., Ltd Address before: 300452, Lingang Economic Zone, Binhai New Area, Tianjin, No. 1 Applicant before: TIANJIN THAI CHEMICAL INDUSTRY Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |