High-transmittance optical diffusion plate and preparation method and application thereof

Abstract

The application relates to the field of functional plates, in particular to a high-transmittance optical diffusion plate and a preparation method and application thereof. The raw materials of the high-transmittance optical diffusion plate mainly comprise polystyrene resin, light diffusing agent, auxiliary resin, reinforcing agent, lubricant and reaction additive and the like. The application discloses a high-transmittance optical diffusion plate and a preparation method thereof. The optical diffusion plate prepared in the application can keep good comprehensive performances of diffusion plate transmittance, stability, waterproof corrosion resistance and the like under the premise of guaranteeing excellent optical performance, avoids performance contradictions and product consistency problems existing in the prior art, and improves use quality and service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of functional panels, and more particularly to an optical diffusion plate with high light transmittance and a preparation method and application thereof. BACKGROUND

[0002] In the field of modern optoelectronic display technology and lighting engineering, optical diffusion plates with high light transmittance, as a kind of key functional optical elements, are widely used in liquid crystal display backlight modules, LED panel lights, light guide plate systems, and various devices requiring uniform area light sources. Their main function is to effectively diffuse the light emitted by point or linear light sources in space, making the light intensity distribution more uniform, eliminating bright spots and dark areas of the light source, and thus improving visual comfort and the overall performance of the optical system. With the increasing demand of consumers for display quality and lighting quality, optical diffusion plates not only need to have excellent light diffusion capability, but also need to achieve as high light transmittance as possible while ensuring high haze, in order to meet the application requirements of energy saving, high brightness and high contrast.

[0003] In the prior art, optical diffusion plates usually use high-molecular polymer materials such as polycarbonate PC, polymethyl methacrylate PMMA or polystyrene PS as substrates, and achieve light scattering function by adding inorganic or organic diffusion particles such as silica, silicone oil microspheres, acrylic resin microbeads, etc. in the matrix. These diffusion particles, through the difference in refractive index between them and the substrate, cause multiple refraction and reflection of light when passing through the panel, thereby achieving diffusion effect; in addition, some technologies also use surface microstructure design to form a physical scattering layer to change the light path distribution.

[0004] Although the prior art has made significant progress in the performance optimization of optical diffusion plates, there are still several technical problems to be solved in practical applications. First of all, traditional particle dispersion type diffusion plates often face the contradiction between light transmittance and haze. In order to improve the haze to achieve better uniformity, the existing technology usually needs to increase the content or particle size of the scattering particles, but this will cause the increase of absorption and reflection loss of light in the scattering process, thereby significantly reducing the overall light transmittance and affecting the light efficiency. Secondly, the dispersion uniformity of the scattering particles in the substrate is difficult to maintain for a long time, and agglomeration or sedimentation phenomenon is easy to occur, which leads to unstable diffusion performance and affects the consistency and service life of the product. SUMMARY

[0005] In summary, how to further improve the light transmittance of the optical diffusion plate under the premise of ensuring high haze and good diffusion uniformity, and realize stable performance and comprehensive performance improvement, is still the main challenge faced by current technology development. Through in-depth research in the field of functional plates, the applicant finally proposes a high light transmittance optical diffusion plate and a preparation method thereof in the present application. The optical diffusion plate prepared in the present application can simultaneously maintain good diffusion plate light transmittance, stability, waterproof corrosion resistance and other comprehensive performance under the premise of ensuring excellent optical performance, avoiding the performance contradiction and product consistency problem existing in the prior art, and improving the use quality and service life.

[0006] A high light transmittance optical diffusion plate, the raw materials include, in mass parts: polystyrene resin 90-120 parts, light diffuser 0.3-1 part, auxiliary resin 10-20 parts, reinforcing agent 4-8 parts, lubricant 0.5-1.5 parts, antioxidant 0.2-0.4 parts, ultraviolet absorber 0.2-0.4 parts, stabilizer 0.4-0.8 parts, and reaction additive 1-2 parts.

[0007] Preferably, the melt flow rate of the polystyrene resin is 8-15 g / 10 min, 200℃ / 5 kg.

[0008] More preferably, the melt flow rate of the polystyrene resin is 10-13 g / 10 min, 200℃ / 5 kg.

[0009] Preferably, the light transmittance of the polystyrene resin is 85-95%.

[0010] Preferably, the mass ratio of the polystyrene resin and the light diffuser is (100-110):(0.4-0.6).

[0011] More preferably, the mass ratio of the polystyrene resin and the light diffuser is (100-105):(0.4-0.5).

[0012] Most preferably, the mass ratio of the polystyrene resin and the light diffuser is 100:0.45.

[0013] Preferably, the light diffuser is at least one of cross-linked polymethyl methacrylate microspheres, cross-linked acrylic resin microspheres and cross-linked polystyrene microspheres.

[0014] More preferably, the light diffuser is cross-linked polymethyl methacrylate microspheres.

[0015] Preferably, the average particle size of the cross-linked polymethyl methacrylate microspheres is 1.5-2.2 μm.

[0016] More preferably, the average particle size of the cross-linked polymethyl methacrylate microspheres is 1.8-2 μm.

[0017] Preferably, the mass ratio of the polystyrene resin, the auxiliary resin and the reinforcing agent is (100-110):(12-16):(5-7).

[0018] More preferably, the mass ratio of the polystyrene resin, the auxiliary resin and the reinforcing agent is (100-105):(13-15):(5.5-6).

[0019] Most preferably, the mass ratio of the polystyrene resin, the auxiliary resin and the reinforcing agent is 100:14:6.

[0020] Preferably, the auxiliary resin is a combination of styrene-acrylonitrile copolymer resin and hydrogenated styrene-butadiene block copolymer resin.

[0021] Preferably, the mass ratio of the styrene-acrylonitrile copolymer resin and the hydrogenated styrene-butadiene block copolymer resin is (6-9):(2-4).

[0022] More preferably, the mass ratio of the styrene-acrylonitrile copolymer resin and the hydrogenated styrene-butadiene block copolymer resin is (7-8):(2-3).

[0023] Preferably, the styrene-acrylonitrile copolymer resin is PN-118L150 from Qimei Chemical Industry in Zhenjiang, China.

[0024] Preferably, the hydrogenated styrene-butadiene block copolymer resin is G1651 from Kraton in the United States.

[0025] The above-mentioned combined auxiliary resin added in the application, as a raw material of PS optical diffusion plate, has the core advantage of effectively making up for the inherent defects of PS material on the basis of maintaining optical performance through the joint action of the two components. Among them, the rigid component as the reinforcing framework significantly improves the overall strength, rigidity and heat resistance of the plate, making it more resistant to deformation and scratching during processing and application. At the same time, the flexible component as a toughening unit effectively induces and terminates micro-cracks through its unique energy dissipation mechanism, converting concentrated impact stress into fine plastic deformation, thereby greatly improving the impact resistance and durability of the material.

[0026] On the other hand, the two specific types of resin raw materials form a stable multiphase structure through interface effect. The rigid phase has good optical compatibility with the PS matrix, avoiding negative effects on light transmittance; while the flexible phase is effectively wrapped and stabilized by the rigid phase, preventing optical defects caused by phase separation. This synergistic design enables the final prepared optical diffusion plate to maintain high transmittance and high haze core optical indicators while achieving excellent comprehensive mechanical properties and long-term reliability.

[0027] Preferably, the reinforcing agent is a combination of hydroxyl-terminated polybutadiene and polymethylene polyphenyl polyisocyanate.

[0028] Preferably, the mass ratio of the hydroxyl-terminated polybutadiene and the polymethylene polyphenyl polyisocyanate is (7-9):(2-3).

[0029] More preferably, the mass ratio of the hydroxyl-terminated polybutadiene and the polymethylene polyphenyl polyisocyanate is 9:2.

[0030] Further adding the combination reinforcing agent can produce a combination effect to significantly improve the comprehensive performance of the material. The two reinforcing agents help to generate an elastic network that is interpenetrated with the PS molecular chains, forming a stable molecular chain interlaced structure that builds a uniform distribution of flexible units that can effectively absorb and disperse external stress, preventing crack propagation and greatly improving the impact resistance and toughness of the material. At the same time, the crosslinked network structure limits the thermal motion of the molecular chains, improving the heat deformation resistance and dimensional stability of the product. Since the size of the structure formed is much smaller than the wavelength of visible light, this reinforcing process does not introduce light scattering points, maintaining the high light transmission properties required for optical diffusion plates and achieving a common improvement in mechanical and optical properties.

[0031] Preferably, the lubricant is at least one of ethylene bis-stearamide, zinc stearate, stearic acid, polyethylene wax, and oxidized polyethylene wax.

[0032] More preferably, the lubricant is ethylene bis-stearamide or zinc stearate.

[0033] Most preferably, the lubricant is ethylene bis-stearamide.

[0034] Preferably, the antioxidant is at least one of antioxidant 445, antioxidant 168, antioxidant 626, and antioxidant DLTDP.

[0035] More preferably, the antioxidant is antioxidant 168 or antioxidant DLTDP.

[0036] Preferably, the ultraviolet light resistant agent is at least one of UV-326, UV-327, and UV-3346.

[0037] More preferably, the ultraviolet light resistant agent is UV-327.

[0038] Preferably, the stabilizer is a combination of polycarbodiimide and ethylene bis-stearamide.

[0039] Preferably, the mass ratio of the polycarbodiimide and the ethylene bis-stearamide is (7-9):(2.5-4).

[0040] More preferably, the mass ratio of the polycarbodiimide and the ethylene bis-stearamide is 7.5:3.

[0041] Preferably, the reaction additive is N-phenylmaleimide.

[0042] A preparation method of a high-transmittance optical diffusion plate, comprising the following steps: S1: polystyrene resin and auxiliary resin are blown dry, then added into a high-speed mixer, and then light diffusing agent, lubricant, antioxidant, ultraviolet absorber, stabilizer and reaction additive are added and mixed at 400-600 rpm for 15-25 min to obtain a mixture; S2: the mixture is melt blended by a co-rotating twin-screw extruder, heated at 165-205 DEG C, discharged at a die head of 195-200 DEG C and a screw rotation speed of 200-250 rpm, cut into particles after water tank cooling and dried to obtain a master batch; S3: the master batch is extruded and shaped, and then treated by three-roller calender upper roll, middle roll and lower roll, and then smoothly pulled and wound to obtain the high-transmittance optical diffusion plate.

[0043] Preferably, the preparation method of the high-transmittance optical diffusion plate comprises the following steps: S1: polystyrene resin and auxiliary resin are blown dry at 80-85 DEG C for 4-5 h, then added into a high-speed mixer, and then light diffusing agent, lubricant, antioxidant, ultraviolet absorber, stabilizer and reaction additive are added and mixed at 400-600 rpm for 15-25 min to obtain a mixture; S2: the mixture is melt blended by a co-rotating twin-screw extruder, heated at 165-205 DEG C, discharged at a die head of 195-200 DEG C and a screw rotation speed of 200-250 rpm, cut into particles after water tank cooling and dried to obtain a master batch; S3: the master batch is extruded and shaped, and then treated by three-roller calender upper roll, middle roll and lower roll, and then smoothly pulled and wound to obtain the high-transmittance optical diffusion plate.

[0044] The application further limits the application of the prepared high-transmittance optical diffusion plate in LED lighting, liquid crystal display and advertising light box assembly.

[0045] The application has the following beneficial effects:

[0046] 1. The optical diffusion plate prepared by the application can simultaneously maintain good diffusion plate transmittance, stability, waterproof corrosion resistance and other comprehensive performance under the premise of ensuring excellent optical performance, avoids the performance contradiction and product consistency problem in the prior art, and improves the use quality and service life.

[0047] 2、The auxiliary resin added in the application, as the raw material of the PS optical diffusion plate, has the core advantage that through the joint action of the two components, the inherent defects of the PS material are effectively compensated on the basis of maintaining the optical performance. Among them, the rigid component serves as a reinforcing skeleton, significantly improving the overall strength, rigidity and heat resistance of the plate, so that it can better resist deformation and scratching during processing and application. At the same time, the flexible component serves as a toughening unit, which effectively induces and terminates micro-cracks through its unique energy dissipation mechanism, and converts concentrated impact stress into fine plastic deformation, thereby greatly improving the impact resistance and durability of the material.

[0048] 3、The combined reinforcing agent further added in the application can cooperate to significantly improve the comprehensive performance of the material. The two reinforcing agents assist in generating an elastic network and interpenetrating with the PS molecular chain, forming a stable molecular chain interlaced structure, and building a uniform distribution of flexible units, which can effectively absorb and disperse external stress and prevent crack propagation, greatly improving the impact resistance and toughness of the material. At the same time, the cross-linked network structure restricts the thermal motion of the molecular chain, improving the heat deformation resistance and dimensional stability of the product. Since the size of the structure formed is much smaller than the wavelength of visible light, this reinforcing process does not introduce light scattering points, maintaining the high light transmission properties required for optical diffusion plates, and achieving the simultaneous improvement of mechanical properties and optical properties. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 The physical map of the high-transmittance optical diffusion plate prepared in Example 1 of the application.

[0050] Figures 2-6 The test report result map of the high-transmittance optical diffusion plate prepared in Example 1 of the application. DETAILED DESCRIPTION

[0051] Example 1

[0052] A high-transmittance optical diffusion plate, the raw materials include, by mass fraction: polystyrene resin 100 parts, light diffuser 0.45 parts, auxiliary resin 14 parts, reinforcing agent 6 parts, lubricant 0.9 parts, antioxidant 0.3 parts, ultraviolet absorber 0.2 parts, stabilizer 0.6 parts, reaction additive 1.4 parts.

[0053] The melt flow rate of the polystyrene resin is 11 g / 10 min at 200℃ / 5 kg, the transmittance is 88%, the model is GPPS123, and it comes from Shanghai Sike Company.

[0054] The light diffuser is cross-linked polymethyl methacrylate microspheres with an average particle size of 1.8 μm, from Beijing Zhongke Keyou Nanometer in China.

[0055] The auxiliary resin is a combination of styrene-acrylonitrile copolymer resin and hydrogenated styrene-butadiene block copolymer resin, with a mass ratio of 7:3. The styrene-acrylonitrile copolymer resin is PN-118L150 from Qimei Chemical Industry in Zhenjiang, China; and the hydrogenated styrene-butadiene block copolymer resin is G1651 from Covestro in the United States.

[0056] The reinforcing agent is a combination of hydroxyl-terminated polybutadiene and polymethylene polyphenyl polyisocyanate, with a mass ratio of 9:2. The hydroxyl-terminated polybutadiene is an industrial grade from Xinghengye Chemical Industry in Hubei, China.

[0057] The lubricant is ethylene bis-stearamide; the antioxidant is antioxidant 168; the ultraviolet absorber is UV-327; and the reaction additive is N-phenyl maleimide.

[0058] The stabilizer is a combination of polycarbodiimide and ethylene bis-stearamide, with a mass ratio of 7.5:3. The polycarbodiimide is an industrial grade from Youen Chemical Industry in Shanghai, China.

[0059] A method for preparing a high-transmittance optical diffusion plate, specifically comprising the following steps: S1: polystyrene resin and auxiliary resin are blown dry at 80℃ for 4.5h, then added into a high-speed mixer, and light diffusing agent, lubricant, antioxidant, ultraviolet absorber, stabilizer and reaction additive are added to mix at 600rpm for 20min to obtain a mixture; S2: the mixture is melt blended by a co-rotating twin-screw extruder, with five-zone heating at 165 / 185 / 195 / 205 / 200℃, die head at 195℃, screw rotation speed at 240rpm, and the material is discharged, then cut into particles after water cooling, dried to obtain a masterbatch; S3: the masterbatch is extruded and shaped, with three-zone heating at 170 / 190 / 200℃, die head at 195℃, and then treated by a three-roll calender with top roll at 100℃, middle roll at 85℃ and bottom roll at 70℃, and then smoothly pulled and wound to obtain the high-transmittance optical diffusion plate.

[0060] The actual high-transmittance optical diffusion plate prepared in this embodiment is shown in Figure 1 .

[0061] The test report result of the high-transmittance optical diffusion plate prepared in this embodiment is shown in Figures 2-6 .

[0062] Example 2

[0063] A high-transmittance optical diffusion plate, with raw materials including, in mass parts: polystyrene resin 108 parts, light diffusing agent 0.5 parts, auxiliary resin 15.5 parts, reinforcing agent 6.5 parts, lubricant 0.9 parts, antioxidant 0.3 parts, ultraviolet absorber 0.2 parts, stabilizer 0.6 parts, and reaction additive 1.4 parts.

[0064] The melt flow rate of the polystyrene resin is 11 g / 10 min, 200℃ / 5 kg, the light transmittance is 88%, model GPPS123, from Shanghai Sike Company.

[0065] The light diffuser is cross-linked polymethyl methacrylate microspheres with an average particle size of 1.8 μm, from Beijing Zhongke Keyou Nano in China.

[0066] The auxiliary resin is a combination of styrene-acrylonitrile copolymer resin and hydrogenated styrene-butadiene block copolymer resin in a mass ratio of 9:2. The styrene-acrylonitrile copolymer resin is PN-118L150 from Qimei Chemical Industry in Zhenjiang, China; the hydrogenated styrene-butadiene block copolymer resin is G1651 from Covestro in the United States.

[0067] The reinforcing agent is a combination of hydroxyl-terminated polybutadiene and polymethylene polyphenyl polyisocyanate in a mass ratio of 7:3. The hydroxyl-terminated polybutadiene is an industrial grade from Xinghengye Chemical Industry in Hubei, China.

[0068] The lubricant is ethylene bis-stearamide; the antioxidant is antioxidant 168; the ultraviolet absorber is UV-327; and the reaction additive is N-phenyl maleimide.

[0069] The stabilizer is a combination of polycarbodiimide and ethylene bis-stearamide in a mass ratio of 8:3. The polycarbodiimide is an industrial grade from Youen Chemical Industry in Shanghai, China.

[0070] A method for preparing a high-transmittance optical diffusion plate, specifically comprising the following steps: S1: polystyrene resin and auxiliary resin are dried at 80℃ with a blast for 4.5 h, which are added into a high-speed mixer, and light diffuser, lubricant, antioxidant, ultraviolet absorber, stabilizer and reaction additive are further added to mix at 600 rpm for 20 min to obtain a mixture; S2: the mixture is melt blended by a co-rotating twin-screw extruder with five-zone heating at 165 / 185 / 195 / 205 / 200℃, the die head is at 195℃, the screw rotation speed is 240 rpm, the material is discharged, and then pelletized after water cooling, dried to obtain a masterbatch; S3: the masterbatch is extruded and shaped, the extrusion temperature interval is 170 / 190 / 200℃ in three zones, the die head is at 195℃, and then the three-roll calender is used for processing with the upper roller at 100℃, the middle roller at 85℃ and the lower roller at 70℃, and after completion, the product is smoothly pulled and wound to obtain the high-transmittance optical diffusion plate.

[0071] Example 3

[0072] A high-transmittance optical diffusion plate, the raw materials include, by mass fraction: polystyrene resin 110 parts, light diffuser 0.52 parts, auxiliary resin 16 parts, reinforcing agent 5.5 parts, lubricant 0.9 parts, antioxidant 0.3 parts, ultraviolet absorber 0.2 parts, stabilizer 0.6 parts, and reaction additive 1.3 parts.

[0073] The melt flow rate of the polystyrene resin is 11 g / 10 min, 200℃ / 5 kg, the light transmittance is 88%, model GPPS123, from Shanghai Sike Company.

[0074] The light diffuser is cross-linked polymethyl methacrylate microspheres with an average particle size of 1.8 μm, from China Beijing Zhongke Keyou Nanometer.

[0075] The auxiliary resin is a combination of styrene-acrylonitrile copolymer resin and hydrogenated styrene-butadiene block copolymer resin with a mass ratio of 8:2.5. The styrene-acrylonitrile copolymer resin is PN-118L150 from China Zhenjiang Qimei Chemical Industry; the hydrogenated styrene-butadiene block copolymer resin is G1651 from the United States Corterra.

[0076] The reinforcing agent is a combination of hydroxyl-terminated polybutadiene and polymethylene polyphenyl polyisocyanate with a mass ratio of 8:2.5. The hydroxyl-terminated polybutadiene is an industrial grade from China Hubei Xingheng Industry Chemical.

[0077] The lubricant is ethylene bis-stearamide; the antioxidant is antioxidant 168; the ultraviolet absorber is UV-327; the reaction additive is N-phenyl maleimide.

[0078] The stabilizer is a combination of polycarbodiimide and ethylene bis-stearamide with a mass ratio of 7.5:4. The polycarbodiimide is an industrial grade from China Shanghai Youen Chemical Industry.

[0079] A preparation method of a high light transmittance optical diffusion plate, specifically comprising the following steps: S1: polystyrene resin and auxiliary resin are blown dry at 80℃ for 4.5 h, which are added into a high-speed mixer, and light diffuser, lubricant, antioxidant, ultraviolet absorber, stabilizer and reaction additive are further added to mix at 600 rpm for 20 min to obtain a mixture; S2: the mixture is melt blended by a co-rotating twin-screw extruder with five-zone heating of 165 / 185 / 195 / 205 / 200℃, a die head of 195℃, a screw rotation speed of 240 rpm, discharging, water tank cooling, granulating, drying to obtain a master batch; S3: the master batch is extruded and shaped with an extrusion temperature interval of 170 / 190 / 200℃ three-zone, a die head of 195℃, followed by a three-roll calender with an upper roller of 100℃, a middle roller of 85℃ and a lower roller of 70℃, after which the product is smoothly pulled and wound to obtain the high light transmittance optical diffusion plate.

[0080] Comparative Example 1

[0081] This comparative example is different from Example 1 only in that a high light transmittance optical diffusion plate, in mass parts, includes polystyrene resin 125 parts, light diffuser 0.6 parts, auxiliary resin 5.5 parts, reinforcing agent 10 parts, lubricant 1 part, antioxidant 0.4 parts, ultraviolet absorber 0.3 parts, stabilizer 0.8 parts, and reaction additive 1.8 parts.

[0082] The remaining embodiments are the same.

[0083] Comparative Example 2

[0084] This comparative example differs from Example 1 only in that a high light transmittance optical diffuser plate is used, and the raw materials include, in mass parts, polystyrene resin 130 parts, light diffusing agent 0.65 parts, auxiliary resin 18.5 parts, reinforcing agent 1.5 parts, lubricant 1.3 parts, antioxidant 0.3 parts, ultraviolet absorber 0.2 parts, stabilizer 0.8 parts, and reaction additive 1.5 parts.

[0085] The remaining embodiments are the same.

[0086] Comparative Example 3

[0087] This comparative example differs from Example 1 only in that the auxiliary resin is a combination of styrene-acrylonitrile copolymer resin and hydrogenated styrene-butadiene block copolymer resin, in a mass ratio of 1:1.

[0088] The remaining embodiments are the same.

[0089] Comparative Example 4

[0090] This comparative example differs from Example 1 only in that the auxiliary resin is a combination of styrene-acrylonitrile copolymer resin and hydrogenated styrene-butadiene block copolymer resin, in a mass ratio of 9.5:0.5.

[0091] The remaining embodiments are the same.

[0092] Comparative Example 5

[0093] This comparative example differs from Example 1 only in that the reinforcing agent is a combination of hydroxyl-terminated polybutadiene and polymethylene polyphenyl polyisocyanate, in a mass ratio of 10.5:0.5.

[0094] The remaining embodiments are the same.

[0095] Comparative Example 6

[0096] This comparative example differs from Example 1 only in that the reinforcing agent is a combination of hydroxyl-terminated polybutadiene and polymethylene polyphenyl polyisocyanate, in a mass ratio of 4:7.

[0097] The remaining embodiments are the same.

[0098] Performance Testing

[0099] 1. Light transmittance and haze: tested according to ASTM D1003, and the test results are the average of 10 tests, as shown in Table 1.

[0100] 2. Mechanical strength: test according to ASTM D638, get tensile strength and elongation at break, the test results are the average of 10 tests in Table 1.

[0101] 3. Softening resistance: test according to ASTM D1525, the test results are the average of 10 tests in Table 1.

[0102] 4. Aging resistance: test according to ASTM G154, put the sample into QUV accelerated aging test box, use UVA-340 lamp, ultraviolet irradiation for 8 hours at 60℃, then condensation for 4h at 50℃ as a cycle, a total of 500h, the test results are the change of yellowing index ΔYI, the average of 10 tests in Table 1.

[0103] 5. Wear resistance: test according to GB 10006-2021, wear test is carried out on the examples, the maximum load is 500g, the friction times is 50, after the test, observe whether there is powder out, the results are recorded in Table 2.

[0104] 6. Low temperature resistance: the optical diffusion plate prepared by the examples is stored at-10℃ for 24h, then restored at 25℃ for 30min, then test the comprehensive size change rate and the transmittance change rate of the optical diffusion plate at this time, the results are recorded in Table 2.

[0105] 7. Cold and hot impact resistance: the optical diffusion plate prepared by the examples is kept at 80℃ for 30min, -30℃ for 30min, the conversion time is 5min, the above is a cycle, a total of five cycles, then test the comprehensive size change rate and the transmittance change rate of the optical diffusion plate at this time, the results are recorded in Table 2.

[0106] 8. Heat resistance: the optical diffusion plate prepared by the examples is stored at 60℃ for 24h, then restored at 25℃ for 30min, test the comprehensive size change rate and the transmittance change rate of the optical diffusion plate, the results are recorded in Table 2.

[0107] Table 1 Performance test results 1

[0108]

[0109] Table 2 Performance test results 2

[0110]

[0111] From the final embodiment and comparative example performance test results, examples 1-3 because of the complete use of the corresponding technical solutions defined in this application, so that its light transmittance, haze, mechanical properties and aging resistance and other performance compared to the comparative example obvious advantage, and can also maintain excellent dimensional stability and light transmittance stability in a variety of temperature environment. Comparative example 1 and comparative example 2 because the auxiliary resin and reinforcing agent are not used in the overall formulation, so that the stability of the molecular chain network decreases, the resistance to external stress and molecular chain slip decreases, the amplitude of the thermal motion of the molecular chain increases significantly, thereby directly leading to the mechanical properties and aging resistance and temperature resistance and other performance decreased significantly.

[0112] Comparative examples 3-6 respectively because of the use of different auxiliary resin and reinforcing agent in examples 1-3 of raw material selection and matching, and then directly lead to the two raw materials in the system together effect is weakened, and directly lead to the overall performance of the diffusion plate decreased significantly, compared with examples 1-3 to obtain worse application effect.

Claims

1. A high-transmittance optical diffuser plate, characterized in that: By weight, the raw materials include: 90-120 parts polystyrene resin, 0.3-1 part light diffusing agent, 10-20 parts auxiliary resin, 4-8 parts reinforcing agent, 0.5-1.5 parts lubricant, 0.2-0.4 parts antioxidant, 0.2-0.4 parts ultraviolet absorber, 0.4-0.8 parts stabilizer, and 1-2 parts reaction additive; The melt flow rate of the polystyrene resin is 8~15g / 10min, 200℃ / 5kg; The light transmittance of the polystyrene resin is 85-95%; The auxiliary resin is a combination of styrene-acrylonitrile copolymer resin and hydrogenated styrene-butadiene block copolymer resin, with a mass ratio of (6~9):(2~4). The reinforcing agent is a combination of hydroxyl-terminated polybutadiene and polymethylene polyphenyl polyisocyanate in a mass ratio of (7~9):(2~3).

2. The high-transmittance optical diffuser plate according to claim 1, characterized in that: The mass ratio of the polystyrene resin to the light diffusing agent is (100~110):(0.4~0.6).

3. The high-transmittance optical diffuser plate according to claim 1, characterized in that: The mass ratio of the polystyrene resin, auxiliary resin and reinforcing agent is (100~110):(12~16):(5~7).

4. The high-transmittance optical diffuser plate according to claim 1, characterized in that: The light diffusing agent is at least one of cross-linked polymethyl methacrylate microspheres and cross-linked polystyrene microspheres.

5. The high-transmittance optical diffuser plate according to claim 1, characterized in that: The styrene-acrylonitrile copolymer resin is PN-118L150; the hydrogenated styrene-butadiene block copolymer resin is G1651.

6. The high-transmittance optical diffuser plate according to claim 1, characterized in that: The lubricant is at least one of ethylene bis-stearamide, zinc stearate, stearic acid, polyethylene wax, and oxidized polyethylene wax.

7. The high-transmittance optical diffuser plate according to claim 1, characterized in that: The stabilizer is a combination of polycarbodiimide and ethylene bis-stearamide in a mass ratio of (7~9):(2.5~4).

8. The high-transmittance optical diffuser plate according to claim 1, characterized in that: The reaction additive is N-phenylmaleimide.

9. The application of a high-transmittance optical diffuser plate according to any one of claims 1 to 8 in LED lighting, liquid crystal display, and advertising light box components.

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