Polystyrene light diffusion plate

Abstract

The invention provides a polystyrene light diffusion plate, which is prepared from the following raw materials in parts by mass: 59.8 to 92.3 parts of polystyrene base material, 5 to 15 parts of fiber filler, 1 to 20 parts of toughening agent, 1 to 3 parts of compatilizer and 0.7 to 5 parts of auxiliary agent, wherein the length-diameter ratio of the fiber filler is 70-200, the compatilizer comprises maleic anhydride grafted polystyrene, and the light diffusion plate has the advantages of being high in impact strength, high in heat-resistant temperature and low in warping degree.

Description

Technical Field

[0001] The present application relates to the technical field of light diffuser plate manufacturing, and in particular to a polystyrene light diffuser plate. Background Art

[0002] In the prior art, general-purpose polystyrene resin material (GPPS) is considered to be one of the ideal materials for preparing light diffuser plates due to its advantages such as low density, moderate light transmittance and low price. However, due to the low impact strength of GPPS material, the diffuser plates are easily broken during transportation and use. In addition, its thermal deformation temperature is also low, usually not higher than 85°C, which causes the diffuser plates to easily warp and deform when used at high temperatures, thereby limiting the application and promotion of GPPS diffuser plates.

[0003] Based on this, technicians found that in the process of preparing GPPS diffuser plates, adding fiber fillers to the raw materials can help improve the impact resistance and heat resistance of the prepared light diffuser plates. However, the addition of fiber fillers causes the prepared light diffuser plates to have more serious warping deformation, which makes it difficult to meet quality requirements and cannot be used. Summary of the invention

[0004] The purpose of the present application is to provide a polystyrene light diffuser plate, which has the advantages of high impact strength, high heat resistance temperature and low warping degree.

[0005] The embodiment of the present application is implemented as follows:

[0006] The embodiment of the present application provides a polystyrene light diffuser plate. The raw materials for preparing the polystyrene light diffuser plate include, by weight:

[0007] 59.8-92.3 parts of polystyrene substrate, 5-15 parts of fiber filler, 1-20 parts of toughening agent, 1-3 parts of compatibilizer and 0.7-5 parts of auxiliary agent; wherein the aspect ratio of the fiber filler is 70-200, and the compatibilizer includes maleic anhydride grafted polystyrene (PS-MAH for short).

[0008] In the prior art, the aspect ratio of commonly used fiber fillers is usually in the range of 300 to 500. After the fiber fillers with a large aspect ratio are oriented (the fiber fillers will be oriented due to the flow during the mixing and extrusion process), the shrinkage rates of the prepared light diffuser plate in different directions will be greatly different, which will lead to more serious warping deformation of the prepared light diffuser plate. In the present application, the raw materials for preparing the polystyrene light diffuser plate include specific components and proportions. On the one hand, a fiber filler with an aspect ratio of 70 to 200 is used. After the fiber filler in the specific aspect ratio range is oriented and arranged, the light diffuser plate can have higher impact resistance and heat resistance temperature, and at the same time, it can also improve the warping problem caused by the high aspect ratio; on the other hand, maleic anhydride grafted polystyrene is used as a compatibilizer. Since it contains both anhydride groups and styrene groups (the anhydride groups can undergo cross-linking reactions with hydroxyl groups on the surface of the fiber filler to combine together, and the styrene groups can extend to the polystyrene substrate and combine with the substrate surface), it can act as a bridge between the fiber filler and the polystyrene substrate to form a continuous network structure, effectively improving the compatibility of the fiber filler and the polystyrene substrate, thereby helping to improve the impact resistance of the prepared light diffuser plate and make it have a more suitable light transmittance, and at the same time, it can also improve the warping problem of the light diffuser plate. Through the combined effect of the two aspects, the light diffuser plate provided in the embodiment of the present application has the advantages of high impact strength, high heat resistance temperature and low warping.

[0009] In some optional embodiments, the fibrous filler includes at least one of glass fibers and mica fibers.

[0010] Optionally, the aspect ratio of the mica fiber is 70-80.

[0011] In the above technical solution, the material of the fiber filler is glass fiber and / or mica fiber, which can be well adapted to the other functional components in the preparation raw materials of the polystyrene light diffuser plate, so that the light diffuser plate has better impact resistance and heat resistance.

[0012] Furthermore, when mica fiber is used as the fiber filler, its aspect ratio is limited to a specific range, which can more effectively improve the warping problem of the light diffuser plate while having relatively excellent impact resistance and heat resistance.

[0013] In some alternative embodiments, the fibrous filler includes flat fibers and / or whisker fibers.

[0014] Optionally, the flat fiber has an aspect ratio of 3.6 to 4.4.

[0015] Optionally, the cross-sectional width of the flat fiber is 6-8 μm.

[0016] Optionally, the aspect ratio of the whisker fiber is 70-100.

[0017] In the above technical solution, the fiber filler adopts a specific shape such as flat fiber and / or whisker fiber, which can reduce the difference in shrinkage rate of the light diffuser plate in different directions, thereby also helping to improve the warping problem of the light diffuser plate.

[0018] Furthermore, limiting the flatness ratio and cross-sectional width of the flat fibers within specific ranges can reduce the difference in shrinkage rate of the light diffuser in different directions to a greater extent, thereby helping to better improve the warping problem of the light diffuser.

[0019] Furthermore, when whisker fibers are used as fiber fillers, their aspect ratio is limited to a specific range, which can more effectively improve the warping problem of the light diffuser plate while having relatively excellent impact resistance and heat resistance.

[0020] In some optional embodiments, the number of styrene monomers in the maleic anhydride grafted polystyrene is 20-500.

[0021] In the above technical solution, the amount of styrene monomers in maleic anhydride grafted polystyrene is limited to a specific range so that the compatibilizer has a more suitable chain length and molecular weight, thereby better playing the role of a bridge.

[0022] In some optional embodiments, in the maleic anhydride grafted polystyrene, the grafting rate is 1-2%.

[0023] In the above technical solution, the grafting rate of maleic anhydride grafted polystyrene is limited to a specific range, so that a relatively appropriate amount of maleic anhydride is grafted on the polystyrene main chain, so that it can better undergo cross-linking reaction with the active groups on the surface of the fiber filler, thereby facilitating the formation of a network structure.

[0024] In some optional embodiments, the refractive index of the fiber filler is 1.5 to 1.65.

[0025] In the above technical solution, a fiber filler with a specific refractive index range is used so that the refractive index of the fiber filler is closer to that of the polystyrene substrate, so that the prepared light diffuser plate has a more suitable light transmittance.

[0026] In some optional embodiments, the toughening agent is selected from at least one of SBS and SEBS.

[0027] In the above technical solution, a specific type of toughening agent with a styrene chain segment is selected, which can also be combined with the polystyrene chain segment in the compatibilizer, so that the fiber filler, the toughening agent and the polystyrene substrate are better compatible together through the compatibilizer, so that the light diffuser plate has the advantages of high impact strength, high heat resistance and low warping.

[0028] In some optional embodiments, the additives include: 0.3 to 1 part of a weathering additive, 0.2 to 3 parts of a light diffuser, and 0.2 to 1 part of a flow additive.

[0029] In the above technical solution, the additive contains a specific mass fraction of a weathering additive, a light diffuser and a flow aid, wherein the weathering additive is conducive to improving the stability of the prepared light diffuser plate, the light diffuser is so that the prepared light diffuser plate has a more suitable light diffusion effect and uniform light, and the flow aid helps to reduce the friction inside the polymer during the melt molding process, reduce equipment wear, and improve processing efficiency and quality. In some optional embodiments, the weathering additive includes an antioxidant and an anti-ultraviolet agent.

[0030] Optionally, the antioxidant is selected from at least one of the antioxidant 1010 and the antioxidant 168 .

[0031] Optionally, the anti-ultraviolet agent is selected from at least one of UV-P and UV-770.

[0032] In the above technical solution, the weathering aids are antioxidants and anti-ultraviolet agents, and specific types of antioxidants and anti-ultraviolet agents are selected to make the prepared product have higher stability. At the same time, the prepared light diffuser plate can also have the function of absorbing ultraviolet light.

[0033] In some optional embodiments, the light diffuser is selected from at least one of an organosilicon light diffuser and titanium dioxide, and / or the flow aid includes zinc stearate.

[0034] In the above technical scheme, a specific type of light diffuser is selected so that the prepared light diffuser plate has a more suitable light diffusion effect and uniform light. A specific type of flow aid is selected to help further reduce the friction inside the polymer during the melt molding process, more effectively reduce equipment wear, and thus better improve processing efficiency and quality. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0036] It should be noted that “and / or” in this application, such as “Feature 1 and / or Feature 2”, refers to the three situations of “Feature 1” alone, “Feature 2” alone, or “Feature 1” plus “Feature 2”.

[0037] In addition, in the description of the present application, unless otherwise specified, the meaning of "multiple" in "one or more" refers to two or more; the range of "value a ~ value b" includes the two end values ​​"a" and "b", and the "unit" in "value a ~ value b + unit of measurement" represents the "unit of measurement" of both "value a" and "value b".

[0038] A polystyrene light diffuser plate according to an embodiment of the present application is described in detail below.

[0039] The embodiment of the present application provides a polystyrene light diffuser plate. The raw materials for preparing the polystyrene light diffuser plate include, by weight:

[0040] 59.8-92.3 parts of polystyrene substrate, 5-15 parts of fiber filler, 1-20 parts of toughening agent, 1-3 parts of compatibilizer and 0.7-5 parts of auxiliary agent; wherein the aspect ratio of the fiber filler is 70-200, and the compatibilizer comprises maleic anhydride grafted polystyrene.

[0041] In the prior art, the aspect ratio of commonly used fiber fillers is usually in the range of 300 to 500. After the fiber fillers with a large aspect ratio are oriented (the fiber fillers will be oriented due to the flow during the mixing and extrusion process), the shrinkage rates of the prepared light diffuser plate in different directions will be greatly different, which will lead to more serious warping deformation of the prepared light diffuser plate. In the present application, the raw materials for preparing the polystyrene light diffuser plate include specific components and proportions. On the one hand, a fiber filler with an aspect ratio of 70 to 200 is used. After the fiber filler in the specific aspect ratio range is oriented and arranged, the light diffuser plate can have higher impact resistance and heat resistance temperature, and at the same time, it can also improve the warping problem caused by the high aspect ratio; on the other hand, maleic anhydride grafted polystyrene is used as a compatibilizer. Since it contains both anhydride groups and styrene groups (the anhydride groups can undergo cross-linking reactions with hydroxyl groups on the surface of the fiber filler to combine together, and the styrene groups can extend to the polystyrene substrate and combine with the substrate surface), it can act as a bridge between the fiber filler and the polystyrene substrate to form a continuous network structure, effectively improving the compatibility of the fiber filler and the polystyrene substrate, thereby helping to improve the impact resistance of the prepared light diffuser plate and make it have a more suitable light transmittance, and at the same time, it can also improve the warping problem of the light diffuser plate. Through the combined effect of the two aspects, the light diffuser plate provided in the embodiment of the present application has the advantages of high impact strength, high heat resistance temperature and low warping.

[0042] It should be noted that the material type of the fiber filler is not limited and can be selected according to conventional methods in the art.

[0043] As an example, the fiber filler includes at least one of glass fiber and mica fiber.

[0044] In this embodiment, the fiber filler is made of glass fiber and / or mica fiber, which can be well matched with other functional components in the raw materials for preparing the polystyrene light diffuser plate, so that the light diffuser plate has better impact resistance and heat resistance.

[0045] As an example, the aspect ratio of the mica fiber is 70-80, such as but not limited to any one of 70, 72, 74, 76, 78 and 80 or a range between any two of the aspect ratios.

[0046] In this embodiment, when mica fiber is used as the fiber filler, its aspect ratio is limited to a specific range, which can more effectively improve the warping problem of the light diffuser plate while having relatively excellent impact resistance and heat resistance.

[0047] It should be noted that the cross-sectional shape of the fiber filler is not limited and can be set according to conventional selection in the art.

[0048] As an example, the fibrous filler includes flat fibers and / or whisker fibers.

[0049] In this embodiment, the fiber filler adopts a specific shape such as flat fiber and / or whisker fiber, which can reduce the difference in shrinkage rate of the light diffuser plate in different directions, thereby also helping to improve the warping problem of the light diffuser plate.

[0050] As an example, the flat fiber has an aspect ratio of 3.6 to 4.4, for example but not limited to, an aspect ratio of any one of 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3 and 4.4 or a range between any two thereof.

[0051] It should be noted that, for flat fibers, the aspect ratio refers to the ratio of the axial length to the short side diameter.

[0052] As an example, the cross-sectional width of the flat fiber is 6-8 μm, for example but not limited to any one of 6 μm, 6.5 μm, 7 μm, 7.5 μm, and 8 μm, or a range between any two of the cross-sectional widths.

[0053] In this embodiment, the aspect ratio and cross-sectional width of the flat fibers are limited within specific ranges, which can reduce the difference in shrinkage rate of the light diffuser in different directions to a greater extent, thereby helping to better improve the warping problem of the light diffuser.

[0054] As an example, the aspect ratio of the whisker fiber is 70-100, for example but not limited to any one of 70, 80, 90 and 100 or a range between any two of the aspect ratios.

[0055] In this embodiment, when whisker fibers are used as fiber fillers, their aspect ratio is limited to a specific range, which can more effectively improve the warping problem of the light diffuser plate while having relatively excellent impact resistance and heat resistance.

[0056] As an example, in maleic anhydride grafted polystyrene, the number of styrene monomers is 20 to 500, for example but not limited to any one of 20, 50, 100, 200, 300, 400 and 500 or a range between any two of the monomer numbers.

[0057] In this embodiment, the amount of styrene monomers in the maleic anhydride grafted polystyrene is limited to a specific range so that the compatibilizer has a more suitable chain length and molecular weight, thereby better playing a bridging role.

[0058] As an example, in maleic anhydride grafted polystyrene, the grafting rate is 1-2%, for example but not limited to any one of 1%, 1.2%, 1.4%, 1.6%, 1.8% and 2% or a range between any two of them.

[0059] In this embodiment, the grafting rate of maleic anhydride grafted polystyrene is limited to a specific range, so that a relatively appropriate amount of maleic anhydride is grafted on the polystyrene main chain, so that it can better undergo cross-linking reaction with the active groups on the surface of the fiber filler, thereby facilitating the formation of a network structure.

[0060] As an example, the refractive index of the fiber filler is 1.5-1.65, such as but not limited to any one of 1.5, 1.52, 1.54, 1.56, 1.58, 1.6, 1.62 and 1.65 or a range between any two thereof.

[0061] In this embodiment, a fiber filler having a specific refractive index range is used so that the refractive index of the fiber filler is relatively close to the refractive index of the polystyrene substrate, so that the prepared light diffuser plate has a relatively suitable light transmittance.

[0062] As an example, the toughening agent is selected from at least one of SBS and SEBS.

[0063] In this embodiment, a specific type of toughening agent having a styrene chain segment is selected, which can also be combined with the polystyrene chain segment in the compatibilizer, so that the fiber filler, the toughening agent and the polystyrene substrate are better compatible together through the compatibilizer, so that the light diffuser plate has the advantages of high impact strength, high heat resistance and low warping.

[0064] As an example, the additives include: 0.3 to 1 part of a weathering additive, 0.2 to 3 parts of a light diffuser, and 0.2 to 1 part of a flow additive.

[0065] In this embodiment, the additive contains specific mass fractions of weathering additive, light diffuser and flow additive, among which the weathering additive is beneficial to improving the stability of the prepared light diffuser plate, the light diffuser makes the prepared light diffuser plate have a more suitable light diffusion effect and uniform light, and the flow additive helps to reduce the friction inside the polymer during the melt molding process, reduce equipment wear, and improve processing efficiency and quality.

[0066] As an example, weathering aids include antioxidants and anti-ultraviolet agents.

[0067] As an example, the antioxidant is selected from at least one of the antioxidant 1010 and the antioxidant 168 .

[0068] As an example, the anti-ultraviolet agent is selected from at least one of UV-P and UV-770.

[0069] In this embodiment, the weathering aids are antioxidants and anti-ultraviolet agents, and specific types of antioxidants and anti-ultraviolet agents are selected to make the prepared product have higher stability, and at the same time, the prepared light diffusion plate can also have the function of absorbing ultraviolet light.

[0070] As an example, the light diffuser is selected from at least one of an organic silicon light diffuser and titanium dioxide, and / or the flow aid includes zinc stearate.

[0071] In this embodiment, a specific type of light diffuser is selected so that the prepared light diffuser plate has a more suitable light diffusion effect and uniform light. A specific type of flow aid is selected to help further reduce the friction inside the polymer during the melt molding process, more effectively reduce equipment wear, and thus better improve processing efficiency and quality.

[0072] It should be noted that the functional components and their proportions in the raw materials for preparing the polystyrene light diffuser plate that are not particularly described or limited can be adaptively adjusted according to conventional selection in the art.

[0073] It should be noted that the preparation process of the polystyrene light diffuser plate is not limited in the embodiments of the present application, and can be specifically prepared according to conventional preparation processes in the art.

[0074] In order to better understand the technical solution, a preparation process of a polystyrene light diffuser plate is used for auxiliary explanation.

[0075] As an example, the method for preparing a polystyrene light diffuser plate includes the following steps:

[0076] According to the weight percentage, a polystyrene substrate, an antioxidant, an anti-ultraviolet agent, a flow aid, a light diffuser, a toughening agent and a compatibilizer are put into a mixer for mixing to obtain a mixture; the mixture and the fiber filler are respectively put into a main feeding bin and a side feeding bin of a twin-screw extruder for extrusion granulation to obtain mixed particles; and then the mixed particles are put into a single-screw extruder for extrusion board making to obtain a light diffuser plate.

[0077] As an example, in the step of extrusion granulation, the processing temperature of the twin-screw extruder is 220-250° C., and the rotation speed is 200-300 rpm.

[0078] As an example, in the process of extrusion board making, the processing temperature of the single screw extruder is 210-240° C. and the rotation speed is 200-300 rpm.

[0079] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0080] Example 1

[0081] The present application provides a process for preparing a polystyrene light diffuser plate, comprising the following steps:

[0082] According to the weight percentage, a polystyrene substrate (PS133N-Tianjin Rentai 75.8 parts), an antioxidant (antioxidant 1010 0.3 parts, antioxidant 168 0.1 parts), an anti-ultraviolet agent (anti-ultraviolet agent UV-P 0.4 parts, anti-ultraviolet agent UV-770 0.2 parts), a flow aid (zinc stearate 0.2 parts), a light diffuser (SL-200M-Samsung 2 parts), a toughening agent (SEBS 10 parts) and a compatibilizer (PS-MAH 1 part, wherein the number of styrene monomers is 200 and the grafting rate is 1.5%) are put into a blender and mixed to obtain a mixture;

[0083] The above-mentioned mixed material and 10 parts of fiber filler are respectively put into the main feeding bin and the side feeding bin of the twin-screw extruder and extruded and granulated to obtain mixed particles; wherein the fiber filler is HC100 of Huajing, specifically, mica fiber with an aspect ratio of 70 to 80, a refractive index of 1.59, and a circular cross-sectional shape; the processing temperature of the twin-screw extruder is 240°C and the rotation speed is 250rpm.

[0084] Then, the mixed particles are put into a single screw extruder for extrusion to form a plate, wherein the processing temperature of the single screw extruder is 220° C. and the rotation speed is 250 rpm, to obtain a light diffuser plate.

[0085] Example 2

[0086] The embodiment of the present application provides a preparation process of a polystyrene light diffuser plate, which differs from Example 1 only in that the fiber filler is Conro's WS-3D whisker fiber, specifically, magnesium sulfate whisker fiber with an aspect ratio of 70 to 100, a refractive index of 1.59, and a circular cross-sectional shape.

[0087] Example 3

[0088] The embodiment of the present application provides a preparation process of a polystyrene light diffuser plate, which differs from Example 1 only in that the fiber filler is ECS3F-03-534A flat glass fiber from Jushi, with an aspect ratio of 150 to 200, an flatness ratio of 4±0.4, a refractive index of 1.58, and a cross-sectional width of 6 to 8 μm.

[0089] Example 4

[0090] The present application provides a process for preparing a polystyrene light diffuser plate, comprising the following steps:

[0091] According to the weight percentage, a polystyrene substrate (PS133N-Tianjin Rentai 59.8 parts), an antioxidant (antioxidant 1010 0.3 parts, antioxidant 168 0.1 parts), an anti-ultraviolet agent (anti-ultraviolet agent UV-P 0.4 parts, anti-ultraviolet agent UV-770 0.2 parts), a flow aid (zinc stearate 0.2 parts), a light diffuser (SL-200M-Samsung 2 parts), a toughening agent (SEBS 20 parts) and a compatibilizer (PS-MAH 2 parts, wherein the number of styrene monomers is 200 and the grafting rate is 1.5%) are put into a blender and mixed to obtain a mixture;

[0092] The above-mentioned mixed material and 15 parts of fiber filler are respectively put into the main feeding bin and the side feeding bin of the twin-screw extruder and extruded and granulated to obtain mixed particles; wherein the fiber filler is HC100 of Huajing, specifically, mica fiber with an aspect ratio of 70 to 80, a refractive index of 1.59, and a circular cross-sectional shape; the processing temperature of the twin-screw extruder is 240°C and the rotation speed is 250rpm.

[0093] Then, the mixed particles are put into a single screw extruder for extrusion to form a plate, wherein the processing temperature of the single screw extruder is 220° C. and the rotation speed is 250 rpm, to obtain a light diffuser plate.

[0094] Example 5

[0095] The embodiment of the present application provides a preparation process of a polystyrene light diffuser plate, which differs from Example 4 only in that the fiber filler is Conro's WS-3D whisker fiber, specifically, magnesium sulfate whisker fiber with an aspect ratio of 70 to 100, a refractive index of 1.59, and a circular cross-sectional shape.

[0096] Example 6

[0097] The embodiment of the present application provides a preparation process of a polystyrene light diffuser plate, which differs from Example 4 only in that the fiber filler is ECS3F-03-534A flat glass fiber from Jushi, with an aspect ratio of 150 to 200, an flatness ratio of 4±0.4, a refractive index of 1.58, and a cross-sectional width of 6 to 8 μm.

[0098] Comparative Example 1

[0099] The comparative example of the present application provides a preparation process of a polystyrene light diffuser plate, which differs from Example 1 only in that the fiber filler is Taishan glass fiber ECS13-4.5-T438H, with an aspect ratio of 290 to 310, a refractive index of 1.59, and a circular cross-sectional shape.

[0100] Comparative Example 2

[0101] The comparative example of the present application provides a preparation process of a polystyrene light diffuser plate, which differs from Example 1 only in that the fiber filler is ECS13-4.5-1.4 from Nanjing Fiberglass Research Institute, with an aspect ratio of 250 to 270, a refractive index of 1.4, and a circular cross-sectional shape.

[0102] Comparative Example 3

[0103] The comparative example of the present application provides a preparation process of a polystyrene light diffuser plate, which is different from Example 1 only in that there is no fiber filler.

[0104] Comparative Example 4

[0105] The comparative example of the present application provides a preparation process of a polystyrene light diffuser plate, which is different from Example 1 only in that: there is no compatibilizer.

[0106] In order to better understand the differences between the various embodiments and comparative examples, they are summarized and described in the form of a table, and please refer to Table 1 for details.

[0107] Table 1

[0108]

[0109]

[0110] Test example

[0111] Test method for physical and chemical properties of polystyrene light diffuser:

[0112] The polystyrene light diffuser plates prepared in Examples 1 to 6 and Comparative Examples 1 to 4 were numbered respectively, and then the impact resistance, warping degree, light transmittance and heat resistance of each sample were tested, and then the test results were statistically summarized in Table 2.

[0113] Among them, the test steps for impact resistance are as follows:

[0114] The sheet prepared by extrusion was cut into strips with a length of 80±2 mm and a width of 10±0.2 mm, placed in a constant temperature and humidity environment of (23±2)°C and (50±5)% RH for 48 h, and the impact resistance was tested using a cantilever beam impact tester.

[0115] The test steps for warpage are as follows:

[0116] The sheet prepared by extrusion was cut into sheets with a length of 290 mm and a width of 210 mm, and placed in a constant temperature and humidity environment of (23±2)°C and (50±5)% RH for 48 h. The sample was placed flat on the table, and the distance between the four vertices and the table was tested. The average value was calculated and recorded as warpage / mm.

[0117] The test steps for light transmittance are as follows:

[0118] The sheet prepared by extrusion was cut into sheets with a length of 290 mm and a width of 210 mm, placed in a constant temperature and humidity environment of (23±2)° C. and (50±5)% RH for 48 h, and the transmittance was tested using a transmittance haze meter.

[0119] The test steps for heat resistance are as follows:

[0120] The sheet prepared by extrusion was cut into sheets with a length of 290 mm and a width of 210 mm, placed in a constant temperature and humidity environment of (23±2)°C and (50±5)% RH for 48 h, and placed in ovens at different temperatures for 24 h. After cooling to room temperature, the upper limit temperature at which the sample had no wavy wrinkles was recorded as the heat resistance temperature.

[0121] Table 2

[0122]

[0123]

[0124] Referring to Table 2, it can be seen from the test results of Examples 1 to 6 and Comparative Examples 1 to 2 that limiting the aspect ratio of the fiber filler within the specific range of the embodiments of the present application can enable the prepared polystyrene light diffuser plate to have both excellent impact resistance and heat resistance and lower warpage.

[0125] It can be seen from the test results of Example 1 and Comparative Example 2 that limiting the refractive index of the fiber filler to a specific range can make the prepared polystyrene light diffuser plate have a relatively excellent light transmittance.

[0126] It can be seen from the test results of Example 1 and Comparative Example 4 that the raw material for preparing the polystyrene light diffuser plate contains PS-MAH, which can make the prepared polystyrene light diffuser plate have relatively excellent impact resistance, heat resistance, light transmittance and low warpage.

[0127] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

Claims

1. A polystyrene light diffuser plate, characterized in that: The raw materials for preparing the polystyrene light diffuser plate include, by weight: 59.8-92.3 parts of polystyrene substrate, 5-15 parts of fiber filler, 1-20 parts of toughening agent, 1-3 parts of compatibilizer and 0.7-5 parts of auxiliary agent; The aspect ratio of the fiber filler is 70 to 200, and the compatibilizer includes maleic anhydride grafted polystyrene.

2. The polystyrene light diffuser plate according to claim 1, characterized in that: The fiber filler includes at least one of glass fiber and mica fiber; Optionally, the aspect ratio of the mica fiber is 70-80.

3. The polystyrene light diffuser plate according to claim 1, characterized in that: The fiber filler includes flat fibers and / or whisker fibers; Optionally, the flatness ratio of the flat fiber is 3.6 to 4.4; Optionally, the cross-sectional width of the flat fiber is 6 to 8 μm; Optionally, the aspect ratio of the whisker fiber is 70-100.

4. The polystyrene light diffuser plate according to claim 1 or 2, characterized in that: In the maleic anhydride grafted polystyrene, the number of styrene monomers is 20 to 500.

5. The polystyrene light diffuser plate according to claim 4, characterized in that: In the maleic anhydride grafted polystyrene, the grafting rate is 1-2%.

6. The polystyrene light diffuser plate according to claim 1 or 2, characterized in that: The refractive index of the fiber filler is 1.5-1.

65.

7. The polystyrene light diffuser plate according to claim 1 or 2, characterized in that: The toughening agent is selected from at least one of SBS and SEBS.

8. The polystyrene light diffuser plate according to claim 1 or 2, characterized in that: Calculated by weight, the additives include: 0.3 to 1 part of a weathering additive, 0.2 to 3 parts of a light diffuser, and 0.2 to 1 part of a flow additive.

9. The polystyrene light diffuser plate according to claim 8, characterized in that: The weathering aid includes an antioxidant and an anti-ultraviolet agent; Optionally, the antioxidant is selected from at least one of antioxidant 1010 and antioxidant 168; Optionally, the anti-ultraviolet agent is selected from at least one of UV-P and UV-770.

10. The polystyrene light diffuser plate according to claim 8, characterized in that: The light diffuser is selected from at least one of an organic silicon light diffuser and titanium dioxide, and / or the flow aid includes zinc stearate.

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