CN113801405A - A light guide plate and its preparation process - Google Patents
A light guide plate and its preparation process Download PDFInfo
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- CN113801405A CN113801405A CN202111195009.9A CN202111195009A CN113801405A CN 113801405 A CN113801405 A CN 113801405A CN 202111195009 A CN202111195009 A CN 202111195009A CN 113801405 A CN113801405 A CN 113801405A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
- C08K5/1345—Carboxylic esters of phenolcarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
- C08K5/18—Amines; Quaternary ammonium compounds with aromatically bound amino groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
- C08K5/526—Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds
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- 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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a light guide plate and a preparation process thereof, relates to an optical conduction technology, and aims to solve the problem that a PS material can be rapidly yellowed under a working environment with higher temperature and stronger oxidability, so that the service life of a product is seriously influenced, wherein the technical scheme is as follows: including the base plate that integrative extrusion molding formed, one side of base plate is sunken to be formed with the light guide arris portion that is regular polygon pyramid of array distribution, is formed with the diffusion point that the cross-section is the rhombus between the adjacent light guide arris portion. According to the invention, the anti-yellowing agent is added into the raw material of the substrate, so that the yellowing condition of the substrate when the substrate is heated for a long time is inhibited, a small amount of coloring agent and light guide powder are added in a matching manner, the light guide effect of the light guide plate can be increased, the light passing through the light guide plate is softer and more uniform, and the generation of bubbles during hot-melting extrusion of the hot-melted raw material can be reduced through drying operation.
Description
Technical Field
The invention relates to an optical conduction technology, in particular to a light guide plate and a preparation process thereof.
Background
The light guide plate is characterized in that light guide points are printed on the bottom surface of an optical acrylic plate by using an optical acrylic/PC/PS plate and then using a high-tech material with extremely high refractive index and no light absorption through laser engraving, V-shaped cross grid engraving and UV screen printing technologies. The optical-grade acrylic sheet is used for absorbing the light emitted from the lamp to stay on the surface of the optical-grade acrylic sheet, when the light irradiates each light guide point, the reflected light can be diffused towards each angle, and then the reflected light is damaged and is emitted from the front surface of the light guide plate. The light guide plate can uniformly emit light through various light guide points with different densities and sizes. The single-sided microstructure array light guide plate is generally manufactured by an extrusion molding process.
The PS material is usually selected and applied to the optical industry in the market because of good light transmittance, so that optical glass and optical instruments can be manufactured, and transparent or bright-colored lamps such as lamp shades, lighting appliances and the like can also be manufactured.
Therefore, a new solution is needed to solve this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a light guide plate and a preparation process thereof.
The technical purpose of the invention is realized by the following technical scheme: the utility model provides a light guide plate, includes the base plate that integrative extrusion molding formed, one side of base plate is sunken to be formed with the light guide arris portion that is regular polygon pyramid of array distribution, and is adjacent be formed with the diffusion point that the cross-section is the rhombus between the light guide arris portion, the base plate includes according to weight percent:
94.5 to 97.5 percent of polystyrene;
2-4% of a light shielding agent;
0.1 to 0.5 percent of antioxidant;
anti-yellowing agent: 0.2 to 0.8 percent;
light guide powder: 0.1 to 0.3 percent;
colorant: 0.1 to 0.2 percent.
By adopting the technical scheme, one side of the substrate of the light guide plate is provided with the light guide edge part with a regular multi-pyramid structure, when light emitted by the light emitting source irradiates the light guide edge part formed by depression, the light can be continuously refracted in the light guide plate through the refraction effect of the prism, so that a point light source can be continuously refracted and reflected to form a surface light source with uniform brightness, and the diffusion point with a rhombic cross section is arranged between the adjacent light guide edge parts, so that the light guide plate not only can well diffuse the light refracted by the light guide edge part, but also can refract and reflect the light rays directly incident into the diffusion point, the brightness difference caused by continuous refraction of the light between the light guide edge parts is reduced, and meanwhile, the anti-yellowing condition of the substrate when being heated for a long time is inhibited, a small amount of coloring agent and light guide powder are matched and added, and the light guide effect of the light guide plate can be increased, the light passing through the light guide plate is softer and more uniform.
The invention is further configured to: the polystyrene is made of general polystyrene, and the light shielding agent is dried nano inorganic titanium dioxide.
By adopting the technical scheme, the general-purpose polystyrene (GPPS) is selected as the polystyrene, and the general-purpose polystyrene has the advantages of light weight, low price, low water absorption, good colorability, dimensional stability, good electrical property and transparent product, so that the light guide rate and the haze of the light guide plate can be improved.
The invention is further configured to: the antioxidant is ethylene bis (oxyethylene) bis [3- (5-tert-butyl-4-hydroxy-m-tolyl) propionate ], and the anti-yellowing agent is one or a mixture of more of dibutyl hydroxy toluene, tris (2, 4-di-tert-butylphenyl) phosphite, 4' -bis (phenylisopropyl) diphenylamine and tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester.
By adopting the technical scheme, a small amount of ethylene bis (oxyethylene) bis [3- (5-tert-butyl-4-hydroxy-m-tolyl) propionate ] is added to the raw material of the substrate as an antioxidant, so that the oxidation of the raw material in a hot-melt molten state can be inhibited, effectively prolongs the service life of the substrate, reduces the yellowing caused by high-temperature oxidation in the production process, and one or a mixture of more of dibutyl hydroxy toluene, tri (2, 4-di-tert-butylphenyl) phosphite, 4' -di (phenylisopropyl) diphenylamine and tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester is added, so that the anti-yellowing capability of the substrate can be further improved by matching with an antioxidant, and the service life of the substrate can be prolonged.
The invention is further configured to: the quantity at light guide arris portion open-ended border is the even number, and is adjacent each arris face of light guide arris portion is isosceles trapezoid structure, the arris face of diffusion point is triangle-shaped.
Through adopting above-mentioned technical scheme, leaded light arris portion open-ended border quantity is the even number, can be when light jets into leaded light arris portion, and the light of reflection can form the symmetry and set up to realize the whole even leaded light rate of light guide plate, make its whole luminance more even.
A preparation process of a light guide plate comprises the following steps:
1) weighing the raw materials according to the proportion;
2) mixing, namely putting the raw materials into a mixer for stirring, and preheating the mixed raw materials;
3) carrying out hot melting, namely conveying the mixed and preheated raw materials into a screw extruder through a vacuum feeding machine, and carrying out melt blending, wherein the temperature is controlled to be 180-200 ℃, and the rotating speed of a screw is 100-300 r/min;
4) adjusting the die, namely adjusting the specification of the extrusion die head according to the thickness and the width of the plate required by a client, adjusting the opening size of the extrusion die head by an air cylinder or a hydraulic cylinder through a stroke controller, and extruding the plate of which the thickness is more than 10 centimeters as a sample;
5) molding, namely when measuring the specifications required by the client for sewing the extruded sheet material, drawing the extruded and molded sheet material to a roller for compression molding to form a sheet material finished product;
6) and (5) laminating, namely drawing the plate finished product subjected to die pressing by laminating equipment, and attaching the PE film to the surface of the plate finished product.
Through adopting above-mentioned technical scheme, when carrying out intensive mixing to the raw materials of mixing, preheat the raw materials, reduce the raw materials and deposit and the moisture that exists among the mixing process, the operation of preheating can effectively reduce the raw materials melting in-process because the production of the bubble in the raw materials that leads to the molten condition of water evaporation, makes the base plate texture more even, avoids the influence of micro-bubble to light guide plate leaded light effect.
The invention is further configured to: the specific steps of the film covering include:
61) feeding, namely conveying the plate finished product subjected to die-pressing forming through a roll shaft, and drawing the PE film to be parallel to the plate finished product;
62) negative pressure dedusting, wherein air extraction equipment is arranged from two edges of the finished plate product, so that a negative pressure area is formed between the PE film and the finished plate product, and the PE film is adhered to the surface of the finished plate product under the action of negative pressure;
63) and (3) eliminating static electricity, wherein a flat pressing roller is arranged at the middle section of the laminating equipment, the PE film subjected to negative pressure film laminating is pressed, and static electricity eliminating equipment is arranged at the tail end of the laminating equipment.
Through adopting above-mentioned technical scheme to adopt the mode of negative pressure dust removal, can reduce the friction on panel surface, and carry out the dust absorption with the mode of negative pressure, make the PE film cover in the surface of panel naturally, protect the surface of panel, reduce being infected with of dust, and add and establish static elimination equipment, can further reduce the static on PE film and the base plate, reduce the absorption of surface dust.
The invention is further configured to: further comprising:
7) and (5) recovering waste materials, namely recovering the waste materials generated in the die adjustment process into a screw extruder to prepare a plate finished product meeting the specification.
By adopting the technical scheme, the waste materials and the samples generated during die adjustment are recycled into the screw extruder for repeated use, so that the waste of resources can be effectively reduced.
The invention is further configured to: the specific steps of waste recovery include:
71) slicing, namely putting the waste material generated in the die adjustment into a slicing machine, and slicing into sheet materials, wherein the thickness of the sheet materials is less than 0.3 mm;
72) grinding, namely putting the tablets into grinding equipment to be ground to obtain fine powder of 200 um;
73) granulating, namely feeding the tablets into a granulator to prepare plastic granules;
74) mixing, namely repeatedly mixing and stirring the fine powder and the plastic particles, baking at constant temperature, and conveying to a screw extruder through a vacuum feeding machine.
By adopting the technical scheme, the waste materials are respectively prepared into fine powder and plastic particles after being sliced to be mixed, the melting and mixing of the waste materials can be accelerated, the fine powder is firstly melted and can adhere to the plastic particles in contact with the fine powder, in the melting process, gaps are filled, and air is reduced.
In conclusion, the invention has the following beneficial effects:
the light guide plate is characterized in that a light guide edge part with a regular multi-pyramid structure is arranged on one side of a substrate of the light guide plate, when light emitted by a light source irradiates on the light guide edge part formed by a recess, the light can be continuously refracted in the light guide plate through the refraction effect of a prism, so that a point light source can be continuously refracted and reflected to form a surface light source with uniform brightness, and a diffusion point with a diamond-shaped cross section is arranged between adjacent light guide edge parts, so that the light reflected by the light guide edge part can be well diffused, the light rays incident into the diffusion point can be refracted and reflected, the brightness difference caused by the continuous refraction of the light between the light guide edge parts can be reduced, and an anti-yellowing agent is added into the raw material of the substrate, thereby inhibiting the yellowing condition of the substrate when the substrate is heated for a long time, a small amount of coloring agent and light guide powder are added in a matching manner, and the light guide effect of the light guide plate can be increased, the light passing through the light guide plate is softer and more uniform.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is a schematic structural view of the present invention;
FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;
FIG. 5 is a cross-sectional view taken at B-B of FIG. 3;
FIG. 6 is a process flow diagram of the present invention.
In the figure: 1. a substrate; 2. a light guide ridge portion; 3. a diffusion point.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
The first embodiment is as follows: as shown in fig. 1 to 3, a light guide plate includes a substrate 1 formed by integral extrusion molding, light guide edge portions 2 in a regular polygonal pyramid shape and distributed in an array are formed at one side of the substrate 1 in a recessed manner, diffusion points 3 with diamond-shaped cross sections are formed between adjacent light guide edge portions 2, and the substrate 1 includes, in percentage by weight:
94.5 to 97.5 percent of polystyrene;
2-4% of a light shielding agent;
0.1 to 0.5 percent of antioxidant;
anti-yellowing agent: 0.2 to 0.8 percent;
light guide powder: 0.1 to 0.3 percent;
colorant: 0.1 to 0.2 percent.
The polystyrene selects general polystyrene material (GPPS), the light shielding agent is dried nano inorganic titanium dioxide, and concretely, the nano inorganic titanium dioxide is dried by a heat insulation pad microwave drying technology, wherein the antioxidant is ethylene bis (oxyethylene) bis [3- (5-tert-butyl-4-hydroxy-m-tolyl) propionate ], and the anti-yellowing agent is one or a mixture of more of dibutyl hydroxy toluene, tris (2, 4-di-tert-butylphenyl) phosphite, 4' -bis (phenyl isopropyl) diphenylamine and tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester.
As shown in fig. 2,4 and 5, the number of the open edges of the light guide edge portion 2 is an even number, each edge surface of the adjacent light guide edge portions 2 is an isosceles trapezoid structure, the edge surface of the diffusion point 3 is a triangle, specifically, in the present embodiment, the number of the open edges of the light guide edge portions 2 is six, and a pair of edges symmetrically arranged are recessed downward to form a recess, and the depth of the recess is smaller than that of the light guide edge portion 2, and the diffusion point 3 is recessed downward to be a quadrangular pyramid structure, and the depth of the diffusion point 3 is smaller than or equal to that of the light guide edge portion 2.
The light guide plate has the advantages that the light guide edge parts 2 with the regular polygon pyramid structure are arranged on one side of the substrate 1 of the light guide plate, when light emitted by the light emitting source irradiates the light guide edge parts 2 formed by the recess, the light can be continuously refracted in the light guide plate through the refraction effect of the prism, so that the point light source can be continuously refracted and reflected to form a surface light source with uniform brightness, the diffusion points 3 with the rhombic cross sections are arranged between the adjacent light guide edge parts 2, the light refracted by the light guide edge parts 2 can be well diffused, the number of the open edges of the light guide edge parts 2 is even, the reflected light can be symmetrically arranged when the light irradiates the light guide edge parts 2, the integral uniform light guide rate of the light guide plate is realized, the integral brightness of the light guide plate is more uniform, the light rays irradiating the diffusion points 3 can be refracted and reflected, the brightness difference caused by the continuous refraction of the light between the light guide edge parts 2 is relieved, meanwhile, the anti-yellowing agent is added into the raw material of the substrate 1, so that the yellowing condition of the substrate 1 when being heated for a long time is inhibited, a small amount of coloring agent and light guide powder are added in a matching manner, the light guide effect of the light guide plate can be improved, and light passing through the light guide plate is softer and more uniform.
The polystyrene is selected from General Purpose Polystyrene (GPPS), the general purpose polystyrene has light weight, low water absorption, good colorability, stable size and transparent product, can improve the light guide rate and haze of the light guide plate, and a small amount of ethylene bis (oxyethylene) bis [3- (5-tert-butyl-4-hydroxy-m-tolyl) propionate ] is added into the raw material of the substrate 1 as an antioxidant, can inhibit the oxidation of the raw material in a hot melt state, effectively improve the service life of the substrate 1, reduce the yellowing condition caused by high-temperature oxidation in the production process, and is added with one or a mixture of more of dibutyl hydroxy toluene, tris (2, 4-di-tert-butylphenyl) phosphite, 4' -di (phenylisopropyl) diphenylamine and tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, can be matched with an antioxidant to further improve the anti-yellowing capacity of the substrate 1 and prolong the service life of the substrate 1.
Example two: a process for preparing a light guide plate according to the first embodiment, comprising:
1) weighing the raw materials according to the proportion;
2) mixing, namely putting the raw materials into a mixer for stirring, and preheating the mixed raw materials;
3) carrying out hot melting, namely conveying the mixed and preheated raw materials into a screw extruder through a vacuum feeding machine, and carrying out melt blending, wherein the temperature is controlled to be 180-200 ℃, and the rotating speed of a screw is 100-300 r/min;
4) adjusting the die, namely adjusting the specification of the extrusion die head according to the thickness and the width of the plate required by a client, adjusting the opening size of the extrusion die head by an air cylinder or a hydraulic cylinder through a stroke controller, and extruding the plate of which the thickness is more than 10 centimeters as a sample;
5) molding, namely when measuring the specifications required by the client for sewing the extruded sheet material, drawing the extruded and molded sheet material to a roller for compression molding to form a sheet material finished product;
6) laminating, the laminating equipment is drawn with the panel finished product after the moulding-die, with the PE film attached on panel finished product surface, it is concrete, the concrete step of tectorial membrane includes:
61) feeding, namely conveying the plate finished product subjected to die-pressing forming through a roll shaft, and drawing the PE film to be parallel to the plate finished product;
62) negative pressure dedusting, wherein air extraction equipment is arranged from two edges of the finished plate product, so that a negative pressure area is formed between the PE film and the finished plate product, and the PE film is adhered to the surface of the finished plate product under the action of negative pressure;
63) and (3) eliminating static electricity, wherein a flat pressing roller is arranged at the middle section of the laminating equipment, the PE film subjected to negative pressure film laminating is pressed, and static electricity eliminating equipment is arranged at the tail end of the laminating equipment.
7) Waste recycling, the waste recycling that produces when will transferring the mould is to screw extruder in, makes the panel finished product that accords with the specification, and is specific, waste recycling's concrete step includes:
71) slicing, namely putting the waste material generated in the die adjustment into a slicing machine, and slicing into sheet materials, wherein the thickness of the sheet materials is less than 0.3 mm;
72) grinding, namely putting the tablets into grinding equipment to be ground to obtain fine powder of 200 um;
73) granulating, namely feeding the tablets into a granulator to prepare plastic granules;
74) mixing, namely repeatedly mixing and stirring the fine powder and the plastic particles, baking at constant temperature, and conveying to a screw extruder through a vacuum feeding machine.
When carrying out intensive mixing to the raw materials of mixing, preheat the raw materials, reduce the raw materials and deposit and the moisture that exists in the mixing process, the operation of preheating can effectively reduce the raw materials melting in-process because the production of the bubble in the raw materials of moisture evaporation and lead to the molten condition, make 1 texture of base plate more even, avoid the influence of micro bubble to light guide plate leaded light effect, and adopt the mode of negative pressure dust removal, can reduce the surperficial friction of panel, and carry out the dust absorption with the mode of negative pressure, make the PE film cover the surface in panel naturally, protect the surface of panel, reduce being infected with of dust, and add and establish the static elimination setting, can further reduce the static on PE film and the base plate 1, reduce the absorption of surface dust.
The waste and the sample generated during the mold adjustment are sliced and then respectively prepared into fine powder and plastic particles for mixing, so that the melting and mixing of the waste can be accelerated, the fine powder is firstly melted and can adhere to the plastic particles in contact with the fine powder, and in the melting process, gaps are filled, so that air is reduced.
Testing the light guide plate:
the above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. A light guide plate, characterized in that: including base plate (1) that integrative extrusion molding formed, one side of base plate (1) is sunken to be formed with light guide arris portion (2) that are regular polygon pyramid of array distribution, and is adjacent be formed with diffusion point (3) that the cross-section is the rhombus between light guide arris portion (2), base plate (1) includes according to weight percentage:
94.5 to 97.5 percent of polystyrene;
2-4% of a light shielding agent;
0.1 to 0.5 percent of antioxidant;
anti-yellowing agent: 0.2 to 0.8 percent;
light guide powder: 0.1 to 0.3 percent;
colorant: 0.1 to 0.2 percent.
2. A light guide plate according to claim 1, wherein: the polystyrene is made of general polystyrene, and the light shielding agent is dried nano inorganic titanium dioxide.
3. A light guide plate according to claim 1, wherein: the antioxidant is ethylene bis (oxyethylene) bis [3- (5-tert-butyl-4-hydroxy-m-tolyl) propionate ], and the anti-yellowing agent is one or a mixture of more of dibutyl hydroxy toluene, tris (2, 4-di-tert-butylphenyl) phosphite, 4' -bis (phenylisopropyl) diphenylamine and tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester.
4. A light guide plate according to claim 1, wherein: the quantity at the opening border of leaded light arris portion (2) is the even number, and is adjacent each prism face of leaded light arris portion (2) is isosceles trapezoid structure, the prism face of diffusion point (3) is triangle-shaped.
5. A process for producing a light guide plate according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:
1) weighing the raw materials according to the proportion;
2) mixing, namely putting the raw materials into a mixer for stirring, and preheating the mixed raw materials;
3) carrying out hot melting, namely conveying the mixed and preheated raw materials into a screw extruder through a vacuum feeding machine, and carrying out melt blending, wherein the temperature is controlled to be 180-200 ℃, and the rotating speed of a screw is 100-300 r/min;
4) adjusting the die, namely adjusting the specification of the extrusion die head according to the thickness and the width of the plate required by a client, adjusting the opening size of the extrusion die head by an air cylinder or a hydraulic cylinder through a stroke controller, and extruding the plate of which the thickness is more than 10 centimeters as a sample;
5) molding, namely when measuring the specifications required by the client for sewing the extruded sheet material, drawing the extruded and molded sheet material to a roller for compression molding to form a sheet material finished product;
6) and (5) laminating, namely drawing the plate finished product subjected to die pressing by laminating equipment, and attaching the PE film to the surface of the plate finished product.
6. The process for preparing a light guide plate according to claim 5, wherein: the specific steps of the film covering include:
61) feeding, namely conveying the plate finished product subjected to die-pressing forming through a roll shaft, and drawing the PE film to be parallel to the plate finished product;
62) negative pressure dedusting, wherein air extraction equipment is arranged from two edges of the finished plate product, so that a negative pressure area is formed between the PE film and the finished plate product, and the PE film is adhered to the surface of the finished plate product under the action of negative pressure;
63) and (3) eliminating static electricity, wherein a flat pressing roller is arranged at the middle section of the laminating equipment, the PE film subjected to negative pressure film laminating is pressed, and static electricity eliminating equipment is arranged at the tail end of the laminating equipment.
7. The process for preparing a light guide plate according to claim 5, wherein: further comprising:
7) and (5) recovering waste materials, namely recovering the waste materials generated in the die adjustment process into a screw extruder to prepare a plate finished product meeting the specification.
8. The process for preparing a light guide plate according to claim 7, wherein: the specific steps of waste recovery include:
71) slicing, namely putting the waste material generated in the die adjustment into a slicing machine, and slicing into sheet materials, wherein the thickness of the sheet materials is less than 0.3 mm;
72) grinding, namely putting the tablets into grinding equipment to be ground to obtain fine powder of 200 um;
73) granulating, namely feeding the tablets into a granulator to prepare plastic granules;
74) mixing, namely repeatedly mixing and stirring the fine powder and the plastic particles, baking at constant temperature, and conveying to a screw extruder through a vacuum feeding machine.
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Cited By (1)
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|---|---|---|---|---|
| WO2023180623A1 (en) * | 2022-03-25 | 2023-09-28 | Tactotek Oy | Integrated optically functional multilayer structure and related method of manufacture |
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| CN113801405B (en) | 2024-07-05 |
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Address after: 312300 floor 1, building 2, Yonghe Town Industrial Zone, Shangyu District, Shaoxing City, Zhejiang Province (residence declaration) Applicant after: Zhejiang Mingyou Optoelectronic Technology Co.,Ltd. Address before: 312300 floor 1, building 2, Yonghe Town Industrial Zone, Shangyu District, Shaoxing City, Zhejiang Province (residence declaration) Applicant before: Shaoxing Mingyou Photoelectric Technology Co.,Ltd. |
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Denomination of invention: A light guide plate and its preparation process Granted publication date: 20240705 Pledgee: Yonghe Sub-branch of Zhejiang Shangyu Rural Commercial Bank Co.,Ltd. Pledgor: Zhejiang Mingyou Optoelectronic Technology Co.,Ltd. Registration number: Y2024980040257 |
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Granted publication date: 20240705 Pledgee: Yonghe Sub-branch of Zhejiang Shangyu Rural Commercial Bank Co.,Ltd. Pledgor: Zhejiang Mingyou Optoelectronic Technology Co.,Ltd. Registration number: Y2024980040257 |