Light conversion master batch, light guide plate and preparation method of light conversion master batch

Abstract

The invention discloses a light conversion master batch, a light guide plate and a preparation method of the light conversion master batch. The light conversion master batch is prepared from the following components in parts by weight: 0.1-1 part of a light modification material, 0.3-8.5 parts of a modifier, 0.2-2.5 parts of a stabilizer, 0.25-4 parts of an antioxidant, 1-5 parts of a lubricant and 15-25 parts of a high-molecular polymer. The light conversion master batch prepared by matching the light modification material with the modifier, the stabilizer and the antioxidant in a specific ratio can convert blue light into red light, and the light guide plate prepared from the light conversion master batch can effectively prevent blue light.

Description

Technical Field

[0001] The present invention relates to a light conversion masterbatch, a light guide plate and a preparation method thereof. Background Art

[0002] With the extensive research and application of LED display and lighting products, while people pursue brightness and energy conservation, they also begin to pay attention to the LED light radiation safety issues, such as the blue light hazard to the human eye, infrared hazard, discomfort glare, and the impact of light on the human body's biological rhythm. Among them, the harm of LED blue light radiation to the human eye retina has become a research hotspot. Blue light has extremely high energy and can penetrate the lens and reach the retina directly, causing the atrophy and even death of light-sensitive cells such as retinal pigment epithelial cells. The death of light-sensitive cells will lead to a decline in vision and even complete loss, and this damage is irreversible. In addition, blue light will also cause macular lesions. Therefore, reducing the spillage rate of blue light is one of the main means to effectively reduce the blue light hazard, and the anti-blue light material has become one of the research focuses.

[0003] CN110982140A discloses a nano anti-blue light masterbatch. The anti-blue light masterbatch is prepared from the following raw materials by mass parts: 80-100 parts of polyolefin resin, 6-10 parts of alumina, 4-6 parts of silica, 5-9 parts of silicon carbide, 2-4 parts of graphene, 5-15 parts of pigment, 4-8 parts of blue light absorber, 1-2 parts of coupling agent, 3-6 parts of plasticizer, 1-2 parts of lubricant, 1-3 parts of antioxidant, and 1-3 parts of dispersant. The anti-blue light masterbatch is added with alumina, silica, silicon carbide, graphene, pigment and blue light absorber. The blue light absorber can only absorb blue light and cannot convert blue light.

[0004] CN114231012A discloses a low-color-stain and high-absorption anti-blue light masterbatch and a preparation method thereof. The low-color-stain and high-absorption anti-blue light masterbatch comprises the following components in mass percentage: 1-10% of ultraviolet absorber; 1-10% of blue light absorber; 80-90% of carrier resin; 0.1-1% of main antioxidant; 0.1-1% of auxiliary antioxidant. The preparation method is: weighing each raw material component according to the mass percentage, stirring and mixing by a high-speed mixer, and then extruding and pelletizing to obtain the low-color-stain and high-absorption anti-blue light masterbatch. The anti-blue light masterbatch uses organic ultraviolet absorber and organic blue light absorber to absorb ultraviolet light precisely and cannot convert blue light.

[0005] CN118480878A discloses an anti-blue light fiber and a preparation method and application thereof. The anti-blue light fiber is prepared by a melt spinning process from a polymer slice and an anti-blue light masterbatch. The anti-blue light masterbatch contains a polymer slice, a blue light absorber, a dispersant and a coupling agent. The blue light absorber used in the anti-blue light masterbatch can only absorb blue light and cannot convert blue light.

[0006] CN114736598A discloses a blue light - resistant light guide plate. The blue light - resistant light guide plate includes a substrate layer, a micro - prism structure layer, a micro - structure layer, and a blue light - resistant coating; the blue light - resistant coating is disposed on the surface of the prism structure layer. When the blue light - resistant coating of the blue light - resistant light guide plate is coated, it is likely to cause problems of unevenness and non - denseness, and at the same time, the coating is likely to fall off.

[0007] In addition, in the field of LED display and lighting, while reducing the blue light spillage rate, the problems of transmittance and color rendering index also need to be considered. Summary of the Invention

[0008] In view of this, one object of the present invention is to provide a light - conversion masterbatch, which can further reduce the blue light spillage rate of the light guide plate as a raw material of the light guide plate, endow the light guide plate itself with the function of preventing blue light, and the transmittance and color rendering index of the formed light guide plate are relatively high. Another object of the present invention is to provide a preparation method of the above - mentioned light - conversion masterbatch. Another object of the present invention is to provide a light guide plate. Another object of the present invention is to provide a preparation method of the above - mentioned light guide plate.

[0009] The present invention adopts the following technical solutions to achieve the above objects.

[0010] On the one hand, the present invention provides a light - conversion masterbatch, which is formed by the following components:

[0011] 0.1 - 1 part by weight of a light - modifying material, 0.3 - 8.5 parts by weight of a modifier, 0.2 - 2.5 parts by weight of a stabilizer, 0.25 - 4 parts by weight of an antioxidant, 1 - 5 parts by weight of a lubricant, and 15 - 25 parts by weight of a high - molecular polymer;

[0012] Among them, the light - modifying material is formed by the following components: 2 - 7 parts by weight of Sb2O3, 1.4 - 4 parts by weight of CaO, 0.3 - 1.5 parts by weight of MgO, 1 - 2 parts by weight of BaO, and 2 - 8 parts by weight of a fluorescent material;

[0013] The chemical composition of the fluorescent material is: Y x La y P a W b O4:zEu 3+ ; where x, y, a, b, and z respectively represent the molar fractions of each element; 0.2 ≤ x ≤ 0.6, 1 ≤ y ≤ 1.8, 0.75 ≤ a ≤ 1.5, 1 ≤ b ≤ 2, 0.2 ≤ z ≤ 0.8;

[0014] The modifier is selected from at least one of phenolic resin, epoxy resin, a mixture of alkyd resin and amino resin, acrylic resin, titanate coupling agent, and silane coupling agent;

[0015] The stabilizer is selected from at least one of phenyl salicylate, p-tert-butylphenyl salicylate, resorcinol monobenzoate, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, the polymer of succinic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol, and bis(2,2,6,6-tetramethylpiperidyl) sebacate;

[0016] For the light conversion masterbatch according to the present invention, preferably, the antioxidant is selected from at least one of antioxidant 168, antioxidant 1010, antioxidant 1076, antioxidant 300, antioxidant 3114, antioxidant 245, 2,6-di-tert-butyl-p-cresol, and 2,4,6-tri-tert-butylphenol.

[0017] For the light conversion masterbatch according to the present invention, preferably, the lubricant is selected from at least one of ethylene bisstearamide, polyethylene wax, zinc stearate, pentaerythritol stearate, and aluminate coupling agent.

[0018] For the light conversion masterbatch according to the present invention, preferably, the high molecular polymer is selected from at least one of polyethylene, polypropylene, polyolefin, ethylene-vinyl acetate copolyester, polyvinyl chloride, and polyethylene terephthalate.

[0019] For the light conversion masterbatch according to the present invention, preferably, in the fluorescent material, 0.3 ≤ x ≤ 0.5, 1.1 ≤ y ≤ 1.5, 0.8 ≤ a ≤ 1.2, 1.2 ≤ b ≤ 1.8, and 0.3 ≤ z ≤ 0.7.

[0020] For the light conversion masterbatch according to the present invention, preferably, the chemical composition of the fluorescent material is: Y 0.44 La 1.29 P 0.92 W 1.51 O4:0.56Eu 3+ 。

[0021] On the other hand, the present invention also provides a preparation method of any one of the above light conversion masterbatches, including the following steps:

[0022] 1) Mix each raw material according to the ratio to obtain a mixed material;

[0023] 2) Extrude the mixed material obtained in step 1) at 130 - 200 °C and 100 - 500 r / min to obtain the light conversion masterbatch.

[0024] On yet another aspect, the present invention also provides a light guide plate, which includes any one of the above light conversion masterbatches.

[0025] For the light guide plate according to the present invention, preferably, the light guide plate further includes a substrate, and the substrate is selected from at least one of glass, PET, PMMA, PS, PC, and MS.

[0026] In another aspect, the present invention also provides a method for preparing any one of the above light guide plates, comprising the following steps:

[0027] Mix the light conversion masterbatch with the substrate, melt extrude and calender to form a light guide plate.

[0028] The present invention combines a light modification material with a modifier, a stabilizer and an antioxidant in a specific ratio to prepare a light conversion masterbatch that can convert blue light into red light. The light guide plate prepared from this light conversion masterbatch has a light transmittance of at least 93% for light in the wavelength range of 250 - 1000 nm, a light spillage rate of at most 4% for light in the wavelength range of 350 - 440 nm, and a color rendering index of at least 95. The light guide plate of the present invention can effectively prevent blue light and has a high color rendering index and light transmittance. Detailed Embodiments

[0029] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0030] The "light transmittance" described in the present invention refers to the ratio of the luminous flux of light passing through a medium to the incident luminous flux, generally expressed as a percentage.

[0031] The "spillage rate" described in the present invention refers to the color ratio parameter of the light emitted by a light source (such as an LED lamp) during normal operation in the CIE chromaticity diagram. The blue light spillage rate refers to the proportion of the blue light component in the spectrum emitted by a light source (such as an LED lamp) relative to the entire spectral distribution in the CIE chromaticity diagram.

[0032] The "color rendering index" described in the present invention refers to an index used to measure the ability of a light source to restore the true color of an object, usually denoted as Ra; the value range of the color rendering index is from 0 to 100, and the higher the color rendering index, the stronger the ability of the light source to restore the color of an object.

[0033] <Light conversion masterbatch>

[0034] The present invention provides a light conversion masterbatch. When applied to a light guide plate, the light guide plate can have a light transmittance of at least 93% for light in the wavelength range of 250 - 1000 nm, a light spillage rate of at most 4% for light in the wavelength range of 350 - 440 nm, and a color rendering index of at least 95; and the resulting light guide plate can effectively prevent blue light.

[0035] The raw materials of the light conversion masterbatch of the present invention include the following components:

[0036] 0.1 to 1 part by weight of a light-modifying material, 0.3 to 8.5 parts by weight of a modifier, 0.2 to 2.5 parts by weight of a stabilizer, 0.25 to 4 parts by weight of an antioxidant, 1 to 5 parts by weight of a lubricant, and 15 to 25 parts by weight of a polymer. This is beneficial for enabling the light guide plate to have a high color rendering index, transmittance, and a low blue light spillage rate.

[0037] In the present invention, the amount of the light-modifying material can be 0.1 to 1 part by weight, preferably 0.15 to 0.8 part by weight, and more preferably 0.2 to 0.5 part by weight. If the amount of the light-modifying material is too low, the light conversion effect cannot be achieved; if the amount of the light-modifying material is too high, it will lead to an increase in cost and a deterioration in the light transmittance of the light guide plate.

[0038] In the present invention, the light-modifying material comprises the following components: 2 to 7 parts by weight of B2O3, 1.4 to 4 parts by weight of CaO, 0.3 to 1.5 parts by weight of MgO, 1 to 2 parts by weight of BaO, and 2 to 8 parts by weight of a fluorescent material;

[0039] The chemical composition of the fluorescent material is: Y x La y P a W b O4:zEu 3+ ; wherein, x, y, a, b, and z respectively represent the molar fractions of each element; wherein, 0.2 ≤ x ≤ 0.6, 1 ≤ y ≤ 1.8, 0.75 ≤ a ≤ 1.5, 1 ≤ b ≤ 2, 0.2 ≤ z ≤ 0.8;

[0040] Y represents the yttrium element. x represents the molar fraction of Y. 0.2 ≤ x ≤ 0.6; preferably, 0.3 ≤ x ≤ 0.5; more preferably, 0.4 ≤ x ≤ 0.45. According to an embodiment of the present invention, x = 0.44.

[0041] La represents the lanthanum element. y represents the molar fraction of La. 1 ≤ y ≤ 1.8; preferably, 1.1 ≤ y ≤ 1.5; more preferably, 1.2 ≤ y ≤ 1.4. According to an embodiment of the present invention, y = 1.29.

[0042] P represents the phosphorus element. a represents the molar fraction of P. 0.75 ≤ a ≤ 1.5; preferably, 0.8 ≤ a ≤ 1.2; more preferably, 0.9 ≤ a ≤ 1. According to an embodiment of the present invention, a = 0.92.

[0043] W represents the tungsten element. b represents the molar fraction of W. 1 ≤ b ≤ 2; preferably, 1.2 ≤ b ≤ 1.8; more preferably, 1.4 ≤ b ≤ 1.6. According to an embodiment of the present invention, b = 1.51.

[0044] Eu 3+represents europium ions. z represents the molar fraction of europium ions. 0.2 ≤ z ≤ 0.8; preferably, 0.3 ≤ z ≤ 0.7; more preferably, 0.5 ≤ z ≤ 0.6. According to one embodiment of the present invention, z = 0.56.

[0045] According to a specific embodiment of the present invention, the fluorescent material of the present invention has the following composition:

[0046] Y 0.44 La 1.29 P 0.92 W 1.51 O4:0.56Eu 3+ .

[0047] In the present invention, the content of the fluorescent material is 2 to 8 parts by weight; preferably 3 to 7 parts by weight; more preferably 4 to 6 parts by weight. According to a specific embodiment of the present invention, the content of the fluorescent material is 5 parts by weight.

[0048] The fluorescent material of the present invention can generate red light under the excitation of blue light, so that the light conversion masterbatch can convert blue light into red light.

[0049] The content of Sb2O3 is 2 to 7 parts by weight; preferably 3 to 6 parts by weight; more preferably 3.5 to 5 parts by weight. According to a specific embodiment of the present invention, the content of Sb2O3 is 4 parts by weight.

[0050] The content of CaO is 1.4 to 4 parts by weight; preferably 1.5 to 3 parts by weight; more preferably 1.6 to 2 parts by weight. According to a specific embodiment of the present invention, the content of CaO is 1.68 parts by weight.

[0051] The content of MgO is 0.3 to 1.5 parts by weight; preferably 0.8 to 1.3 parts by weight; more preferably 0.9 to 1.2 parts by weight. According to a specific embodiment of the present invention, the content of MgO is 1 part by weight.

[0052] The content of BaO is 1 to 2 parts by weight; preferably 1.2 to 1.8 parts by weight; more preferably 1.5 to 1.6 parts by weight. According to a specific embodiment of the present invention, the content of BaO is 1.55 parts by weight.

[0053] According to one embodiment of the present invention, the light-modifying material is formed only by 2 to 7 parts by weight of B2O3, 1.4 to 4 parts by weight of CaO, 0.3 to 1.5 parts by weight of MgO, 1 to 2 parts by weight of BaO, and 2 to 8 parts by weight of the fluorescent material.

[0054] In the present invention, the dosage of the modifier can be 0.3 to 8.5 parts by weight, preferably 0.4 to 6 parts by weight, and more preferably 0.5 to 3 parts by weight. If the dosage of the modifier is too low, the modification effect cannot be achieved; if the dosage of the modifier is too high, it will lead to an increase in cost, an increase in the brittleness of the light guide plate, and a deterioration in both the light transmittance and the overflow rate.

[0055] In the present invention, the modifier can be selected from at least one of phenolic resin, epoxy resin, a mixture of alkyd resin and amino resin, acrylic resin, titanate coupling agent, and silane coupling agent, preferably at least one of phenolic resin, epoxy resin, a mixture of alkyd resin and amino resin, and titanate coupling agent, and more preferably at least one of a mixture of alkyd resin and amino resin and titanate coupling agent. The titanate coupling agent can be at least one of isopropyl dioleate acyloxy (dioctyl phosphate acyloxy) titanate, trioleoyl titanate isopropyl ester, triisostearoyl titanate isopropyl ester, isopropyl tris (dioctyl pyrophosphate acyloxy) titanate, and tetra isopropyl di (dioctyl phosphite) titanate, preferably at least one of isopropyl dioleate acyloxy (dioctyl phosphate acyloxy) titanate, isopropyl tris (dioctyl pyrophosphate acyloxy) titanate, and tetra isopropyl di (dioctyl phosphite) titanate, and more preferably at least one of isopropyl dioleate acyloxy (dioctyl phosphate acyloxy) titanate and isopropyl tris (dioctyl pyrophosphate acyloxy) titanate.

[0056] According to a preferred embodiment of the present invention, the modifier is composed of a mixture of alkyd resin and amino resin and a titanate coupling agent. The titanate coupling agent is isopropyl dioleate acyloxy (dioctyl phosphate acyloxy) titanate. The mass ratio of the alkyd resin to the amino resin is 1:1, and the mass ratio of the mixture of alkyd resin and amino resin to the titanate coupling agent is 3:2. The present invention finds that this is more conducive to obtaining a light guide plate with a higher color rendering index, higher transmittance, and lower overflow rate.

[0057] In the present invention, the dosage of the stabilizer can be 0.2 to 2.5 parts by weight, preferably 0.2 to 2 parts by weight, and more preferably 0.25 to 1 part by weight. If the dosage of the stabilizer is too low, the stabilizing effect cannot be achieved; if the dosage of the stabilizer is too high, it will lead to an increase in cost and a decrease in the hardness of the light guide plate, and a deterioration in both the light transmittance and the overflow rate.

[0058] In the present invention, the stabilizer can be selected from at least one of phenyl salicylate, p-tert-butylphenyl salicylate, resorcinol monobenzoate, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, the polymer of succinic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol, and bis(2,2,6,6-tetramethylpiperidinol) sebacate. Preferably, it is at least one of phenyl salicylate, p-tert-butylphenyl salicylate, resorcinol monobenzoate, 2-hydroxy-4-methoxybenzophenone, and 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid. More preferably, it is at least one of phenyl salicylate, p-tert-butylphenyl salicylate, resorcinol monobenzoate, and 2-hydroxy-4-methoxybenzophenone.

[0059] According to a preferred embodiment of the present invention, the stabilizer is p-tert-butylphenyl salicylate.

[0060] In the present invention, the dosage of the antioxidant can be 0.25 to 4 parts by weight, preferably 0.3 to 2 parts by weight, and more preferably 0.5 to 1 part by weight. If the dosage of the antioxidant is too low, the antioxidant effect cannot be achieved; if the dosage of the antioxidant is too high, it will lead to an increase in cost and a deterioration in both the light transmittance and the overflow rate of the light guide plate.

[0061] In the present invention, the antioxidant can be selected from at least one of antioxidant 168, antioxidant 1010, antioxidant 1076, antioxidant 300, antioxidant 3114, antioxidant 245, 2,6-di-tert-butyl-p-cresol, and 2,4,6-tri-tert-butylphenol. Preferably, it is one or more of antioxidant 168, antioxidant 1010, antioxidant 1076, antioxidant 300, antioxidant 3114, and antioxidant 245. More preferably, it is at least one of antioxidant 168, antioxidant 1010, antioxidant 1076, and antioxidant 300.

[0062] According to a preferred embodiment of the present invention, the antioxidant is antioxidant 168.

[0063] In the present invention, the dosage of the lubricant can be 1 to 5 parts by weight, preferably 1.5 to 4.5 parts by weight, and more preferably 2 to 4 parts by weight. If the dosage of the lubricant is too low, the lubrication effect cannot be achieved; if the dosage of the lubricant is too high, it will lead to an increase in cost and a deterioration in the light transmittance of the light guide plate.

[0064] In the present invention, the lubricant can be selected from at least one of vinyl bisstearamide, polyethylene wax, zinc stearate, pentaerythritol stearate, and aluminate coupling agent. Preferably, it is at least one of vinyl bisstearamide, polyethylene wax, zinc stearate, and pentaerythritol stearate. More preferably, it is one or more of vinyl bisstearamide, polyethylene wax, and zinc stearate.

[0065] According to a preferred embodiment of the present invention, the lubricant is vinyl bisstearamide.

[0066] In the present invention, the dosage of the high molecular polymer can be 15 to 25 parts by weight, preferably 16 to 22 parts by weight, and more preferably 18 to 20 parts by weight.

[0067] The high molecular polymer can be selected from at least one of polyethylene, polypropylene, polyolefin, ethylene-vinyl acetate copolyester, polyvinyl chloride, and polyethylene terephthalate, preferably at least one of polyethylene, polypropylene, polyolefin, and polyvinyl chloride, and more preferably one or more of polyethylene, polypropylene, and polyvinyl chloride.

[0068] According to a preferred embodiment of the present invention, the light conversion masterbatch is formed by 0.25 parts by weight of a light modification material, 0.5 parts by weight of a modifier, 0.25 parts by weight of a stabilizer, 0.5 parts by weight of an antioxidant, 3.5 parts by weight of a lubricant, and 20 parts by weight of polyethylene. Among them, the modifier is composed of a mixture of alkyd resin and amino resin, and a titanate coupling agent (isopropyl dioleate acyloxy (dioctyl phosphate acyloxy) titanate). The mass ratio of the alkyd resin to the amino resin is 1:1, and the mass ratio of the mixture of the alkyd resin and the amino resin to the titanate coupling agent is 3:2. The stabilizer is p-tert-butylphenyl salicylate, and the antioxidant is antioxidant 168.

[0069] A reasonable light modification material combined with reasonable raw material composition and ratio is beneficial to ensuring the conversion effect of the light conversion masterbatch and is more beneficial to the resulting light guide plate for preventing blue light.

[0070] <Preparation method of the light conversion masterbatch>

[0071] The present invention also provides a preparation method of the above light conversion masterbatch, including a mixing step and an extrusion step. The following is a detailed description.

[0072] Mixing step

[0073] Mix the raw materials according to the ratio to obtain a mixed material.

[0074] In the present invention, any type of mixing device known in the art can be used to achieve mixing. For example, but not limited to, a high-speed mixer can be used to mix the raw materials.

[0075] According to an embodiment of the present invention, when using a high-speed mixer for mixing, the rotation speed of the high-speed mixer can be 700 to 1200 r / min, preferably 800 to 1150 r / min, and more preferably 850 to 1100 r / min.

[0076] Reasonable mixing conditions can ensure more uniform mixing of raw materials, which is beneficial to the pre-dispersion of the light-modifying material and more conducive to improving the dispersion and uniformity of the light-modifying material in the light guide plate.

[0077] The raw materials used in the present invention can be commercially available products or prepared by existing preparation methods, and no special limitation is made here. The purity of the raw materials of the present invention is at least industrial pure (99.9 wt%).

[0078] Extrusion step

[0079] The mixed material is extruded at 130 - 200 °C and 100 - 500 r / min to obtain the light conversion masterbatch.

[0080] According to an embodiment of the present invention, the extrusion temperature can be 130 - 200 °C, preferably 135 - 185 °C, and more preferably 135 - 185 °C.

[0081] According to an embodiment of the present invention, the extrusion speed can be 100 - 500 r / min, preferably 150 - 450 r / min, and more preferably 200 - 400 r / min.

[0082] Reasonable extrusion conditions are beneficial to the pre-dispersion of the light-modifying material and more conducive to improving the dispersion and uniformity of the light-modifying material in the light guide plate.

[0083] In the present invention, the extrusion can be realized in an extruder. The extruder can be any type of extruder well-known in the art, and no special limitation is made here. For example, it can be a twin-screw extruder.

[0084] <Light guide plate>

[0085] The present invention also provides a light guide plate, which includes the above-mentioned light conversion masterbatch.

[0086] According to an embodiment of the present invention, the light guide plate further includes a substrate, and the substrate can be selected from at least one of glass, PET (polyethylene terephthalate), PMMA (polymethyl methacrylate), PS (polystyrene), PC (polycarbonate), MS (styrene-methyl methacrylate copolymer), preferably at least one of PET, PMMA, PS, PC, and more preferably at least one of PET, PMMA, PC.

[0087] According to an embodiment of the present invention, the mass ratio of the light conversion masterbatch to the substrate can be 1:0.5 - 5, preferably 1:1 - 5, and more preferably 1:1 - 3.

[0088] <Preparation method of the light guide plate>

[0089] The present invention also provides a method for preparing the light guide plate, comprising the following steps:

[0090] The light-converting masterbatch is mixed with the substrate, melt-extruded, and calendered to obtain a light guide plate.

[0091] In the present invention, the substrate is preferably in a granular form. In the present invention, melt extrusion can be achieved in an extruder. The extruder can be any type of extruder known in the art, and is not particularly limited here. For example, it can be a twin-screw extruder.

[0092] In the present invention, the calendering can be achieved in a calender. The calender can be any type of calender known in the art, and is not particularly limited here. For example, it can be a three-roll calender.

[0093] In the present invention, any type of mixing device known in the art can be used to mix the light conversion masterbatch and the base material. For example, but not limited to, a high-speed mixer can be used to mix the raw materials.

[0094] According to one embodiment of the present invention, when a high-speed mixer is used for mixing, the rotation speed of the high-speed mixer may be 500 to 1000 r / min, preferably 600 to 950 r / min, and more preferably 650 to 900 r / min.

[0095] Reasonable preparation conditions of light guide plates are conducive to improving the dispersion and uniformity of the modified materials in the light-converting masterbatch in the light guide plate, and are more conducive to improving the anti-blue light performance of the light guide plate.

[0096] <Test method>

[0097] Transmittance measurement: Hitachi UH-4150 spectrophotometer was used to test the transmittance of a light guide plate with a specification of 200×50×5mm to light in the 250-1000nm band.

[0098] Determination of overflow rate and color rendering index:

[0099] A 200×50×5mm light guide plate and commercially available LED lamp beads were packaged together in a lamp, and the overflow rate and color rendering index of the light guide plate were tested. Among them:

[0100] Overflow rate measurement: HAAS2000 fluorescence spectrometer was used to test the overflow rate of the light guide plate for light in the 350-440nm band.

[0101] Color rendering index determination: The test was carried out using the PCE-2000A photoelectric color comprehensive testing system produced by Hangzhou Yuanfang Instrument Co., Ltd.

[0102] <Ingredients>

[0103] The raw materials in the following examples are all commercially available products unless otherwise specified.

[0104] Among them, the mass ratio of alkyd resin to amino resin in the alkyd resin and amino resin mixture is 1:1.

[0105] The grade of isopropyl dioleoyl oxy (dioctyl phosphate oxy) titanate is TMC-101.

[0106] The polyethylene is high-density polyethylene with a density of 0.940 - 0.976.

[0107] Preparation example

[0108] Prepare the light-modified material:

[0109] (1) According to the chemical composition Y 0.44 La 1.29 P 0.92 W 1.51 O4:0.56Eu 3+ Prepare the fluorescent material:

[0110] Burn Y2O3, WO3, La2O3, (NH4)2HPO4, Eu2O3 and the flux LiCl at 1400 °C for 4 h to obtain a fired product; the dosage of LiCl is 5 wt% of the total mass of Y2O3, WO3, La2O3, (NH4)2HPO4 and Eu2O3. Crush the fired product to obtain a fluorescent material with a particle size ≤ 1.8 μm.

[0111] (2) Mix 4 parts by weight of Sb2O3, 3 parts by weight of CaCO3, 1 part by weight of MgO, 2 parts by weight of BaCO3 and 5 parts by weight of the fluorescent material prepared in step (1) in a mixer, and then calcine at 1500 °C to obtain a calcined product.

[0112] (3) Carry out jaw crushing on the calcined product using a jaw crusher, and then carry out sand grinding using a sand mill to obtain the light-modified material.

[0113] Example 1 and Comparative Examples 1-5

[0114] Refer to the dosage of each raw material in Table 1 to prepare the light conversion masterbatch:

[0115] Among them, the modifier is composed of a mixture of alkyd resin and amino resin and a titanate coupling agent (TMC-101), the stabilizer is p-tert-butylphenyl salicylate, the antioxidant is antioxidant 168, the lubricant is vinyl bisstearamide, and the polymer is polyethylene.

[0116] 1) adding the light modification material prepared in the preparation example, the mixture of alkyd resin and amino resin, titanate coupling agent, p-tert-butylbenzene salicylate, antioxidant 168, vinyl bis stearamide, and polyethylene into a high-speed mixer according to a proportion, and mixing at 1000 r / min to obtain a mixture;

[0117] 2) The mixed material is placed in a twin-screw extruder and extruded at 150° C. and 300 r / min to obtain a light-converting masterbatch.

[0118] Table 1

[0119]

[0120]

[0121] Application Experimental Example 1 and Comparative Experimental Examples 1-5

[0122] 25 g of light-converting masterbatch and 25 g of polycarbonate (PC) were added into a high-speed mixer and mixed at 800 r / min. The mixed materials were melt-extruded through a twin-screw extruder, and then calendered and formed through a three-roll calender to obtain a light guide plate.

[0123] The prepared light guide plates were tested as follows:

[0124] Test the transmittance of light in the 250-1000nm band. Test the overflow rate of light in the 350-440nm band.

[0125] Test the color rendering index.

[0126] The light conversion masterbatch is specifically shown in Table 2. The transmittance, overflow rate and color rendering index are shown in Table 2.

[0127] Table 2

[0128]

[0129]

[0130] As shown in Table 2 above, compared with comparative experimental examples 1 to 5, the light guide plate of application experimental example 1 has higher transmittance, lower overflow rate and greater color rendering index. The light modification material of the present invention is matched with a modifier, a stabilizer and an antioxidant in a specific ratio, so that the light guide plate prepared can further reduce the blue light overflow rate while ensuring the light transmission effect, and has a higher color rendering index.

[0131] The present invention is not limited to the above-mentioned embodiments. Without departing from the essential content of the present invention, any deformation, improvement and substitution that can be conceived by those skilled in the art shall fall within the scope of the present invention.

Claims

1. A light conversion masterbatch, characterized in that: The light conversion masterbatch is formed by the following components: 0.1-1 parts by weight of light-modifying material, 0.3-8.5 parts by weight of modifier, 0.2-2.5 parts by weight of stabilizer, 0.25-4 parts by weight of antioxidant, 1-5 parts by weight of lubricant and 15-25 parts by weight of high molecular polymer; Wherein, the light modification material is formed by the following components: 2 to 7 parts by weight of Sb2O3, 1.4 to 4 parts by weight of CaO, 0.3 to 1.5 parts by weight of MgO, 1 to 2 parts by weight of BaO and 2 to 8 parts by weight of fluorescent material; The chemical composition of the fluorescent material is: x La y P a W b O4:zE 3+ ; Wherein, x, y, a, b and z represent the molar fraction of each element respectively; 0.2≤x≤0.6, 1≤y≤1.8, 0.75≤a≤1.5, 1≤b≤2, 0.2≤z≤0.8; The modifier is selected from at least one of phenolic resin, epoxy resin, alkyd resin and amino resin mixture, acrylic resin, titanate coupling agent, and silane coupling agent; The stabilizer is selected from at least one of phenyl salicylate, p-tert-butylphenyl salicylate, resorcinol monobenzoate, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-benzophenone-5-sulfonic acid, a polymer of succinic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol, and sebacic acid bis-2,2,6,6-tetramethylpiperidinol ester.

2. The light conversion masterbatch according to claim 1, characterized in that: The antioxidant is selected from at least one of antioxidant 168, antioxidant 1010, antioxidant 1076, antioxidant 300, antioxidant 3114, antioxidant 245, 2,6-di-tert-butyl-p-cresol, and 2,4,6-tri-tert-butylphenol.

3. The light conversion masterbatch according to claim 1, characterized in that: The lubricant is selected from one or more of vinyl bis stearamide, polyethylene wax, zinc stearate, pentaerythritol stearate, and aluminate coupling agent.

4. The light conversion masterbatch according to claim 1, characterized in that: The high molecular polymer is selected from one or more of polyethylene, polypropylene, polyolefin, ethylene-vinyl acetate copolyester, polyvinyl chloride and polyethylene terephthalate.

5. The light conversion masterbatch according to claim 1, characterized in that: In the fluorescent material, 0.3≤x≤0.5, 1.1≤y≤1.5, 0.8≤a≤1.2, 1.2≤b≤1.8, and 0.3≤z≤0.

7.

6. The light conversion masterbatch according to claim 5, characterized in that: The chemical composition of the fluorescent material is: 0.44 La 1.29 P 0.92 W 1.51 O4:0.56Eu 3+ .

7. A method for preparing the light conversion masterbatch according to any one of claims 1 to 6, comprising the following steps: 1) Mixing the raw materials according to a ratio to obtain a mixture; 2) Extruding the mixture obtained in step 1) at 130-200° C. and 100-500 r / min to obtain a light-converting masterbatch.

8. A light guide plate, characterized in that: The light guide plate comprises the light conversion masterbatch according to any one of claims 1 to 6.

9. The light guide plate according to claim 8, characterized in that: The light guide plate further comprises a substrate, and the substrate is selected from at least one of glass, PET, PMMA, PS, PC, and MS.

10. A method for preparing the light guide plate according to claim 8 or 9, comprising the following steps: The light-converting masterbatch is mixed with the substrate, melt-extruded, and calendered to obtain a light guide plate.

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