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CN-119550709-B - PP resin foaming optical diffusion plate and preparation method thereof

CN119550709BCN 119550709 BCN119550709 BCN 119550709BCN-119550709-B

Abstract

The invention discloses a PP resin foaming optical diffusion plate and a preparation method thereof, wherein the diffusion plate comprises an upper layer, a middle layer and a lower layer, the upper layer and the lower layer are positioned on two sides of the middle layer, the thickness ratio of the upper layer to the middle layer to the lower layer is 1 (7-9): 1, the upper layer and the lower layer are identical in composition, the upper layer comprises the following components in parts by mass, namely PP resin, PP-g-MAH resin, copolymer microsphere, flame retardant, antioxidant, mineral oil, light stabilizer, ultraviolet absorber and whitening agent, the middle layer comprises the following components in parts by mass, namely GPPS resin, foaming agent, antioxidant, mineral oil, light stabilizer, ultraviolet absorber and whitening agent, and the diffusion plate is stable in integral structure, good in optical performance and low in manufacturing cost.

Inventors

  • Ling Gaode
  • WANG XINGLI
  • WANG XIAOHONG
  • LIANG MANYI

Assignees

  • 广东瑞捷新材料股份有限公司

Dates

Publication Date
20260512
Application Date
20241128

Claims (9)

  1. 1. The PP resin foaming optical diffusion plate is characterized by comprising an upper layer, a middle layer and a lower layer, wherein the upper layer and the lower layer are positioned on two sides of the middle layer, the thickness ratio of the upper layer to the middle layer is 1 (7-9): 1, the upper layer and the lower layer are identical in composition, the upper layer comprises, by mass, 69-85 parts of PP resin, 10-20 parts of PP-g-MAH resin, 1-3 parts of copolymer microspheres, 3-5 parts of flame retardant, 0.3-0.7 part of antioxidant, 0.08-0.16 part of mineral oil, 0.4-1.2 parts of light stabilizer, 0.2-0.9 part of ultraviolet absorber and 0.02-0.04 part of whitening agent, and the middle layer comprises, by mass, 83-93 parts of GPPS resin, 5-13 parts of foaming agent, 0.4-1.2 parts of antioxidant, 0.23-0.27 part of mineral oil, 0.6-1 part of light stabilizer, 0.4-1.2 part of ultraviolet absorber and 0.43-37 part of whitening agent; wherein the preparation of the copolymer microsphere comprises the following steps: Respectively dissolving 30-50 parts of maleic anhydride, 45-55 parts of styrene and 5-15 parts of azodiisobutyronitrile in 150-250 parts of isoamyl acetate, introducing nitrogen for 30-40 min, heating in a 70 ℃ water bath for 4-6 h, centrifugally separating the suspension after reaction, removing the supernatant, dispersing the solid in n-hexane, washing, filtering, collecting filter residues, and drying the filter residues to obtain the copolymer microsphere.
  2. 2. The PP resin foam optical diffuser plate of claim 1 wherein the antioxidant is at least one of antioxidant 1024, antioxidant 1010 or antioxidant 1076.
  3. 3. The PP resin foam optical diffuser plate of claim 1 wherein the mineral oil is silicone oil or liquid paraffin.
  4. 4. The PP resin foaming optical diffusion plate of claim 1 wherein the light stabilizer is any one or more selected from the group consisting of light stabilizer 622, light stabilizer 770, light stabilizer 944.
  5. 5. The PP resin foam optical diffuser plate of claim 1 wherein the ultraviolet absorber is selected from the group consisting of one or more of ultraviolet absorbers UV-327, UV-329, UV-531.
  6. 6. The PP resin foam optical diffuser plate of claim 1 wherein the whitening agent is optical brightening agent CBS-127.
  7. 7. A method for preparing the PP resin foaming optical diffusion plate as defined in any one of claims 1 to 6, comprising the following steps: Preparing the copolymer microsphere; Uniformly mixing 1-3 parts of copolymer microspheres with 69-85 parts of PP resin, 10-20 parts of PP-g-MAH resin, 3-5 parts of flame retardant, 0.3-0.7 part of antioxidant, 0.08-0.16 part of mineral oil, 0.4-1.2 parts of light stabilizer, 0.2-0.9 part of ultraviolet absorber and 0.02-0.04 part of brightening agent to obtain a mixture a; Uniformly mixing 83-93 parts of GPPS resin, 5-13 parts of foaming agent, 0.4-1.2 parts of antioxidant, 0.23-0.27 part of mineral oil, 0.6-1 part of light stabilizer, 0.4-1.1 parts of ultraviolet absorbent and 0.37-0.43 part of whitening agent to obtain a mixture b; The mixture a and the mixture b are put into a single screw extruder according to the mass part ratio of 2 (3-5), heated, melted, three layers and co-extruded, and pressed and molded to obtain a finished product; The temperature of each zone of the single-screw extruder is 180-190 ℃, 190-200 ℃, 210-220 ℃, 225-235 ℃, 215-225 ℃, 210-220 ℃, 205-215 ℃ and 310kg/h.
  8. 8. The method for preparing a PP resin foaming optical diffusion plate according to claim 7, wherein the centrifugation rate is 2000-4000 r/min and the centrifugation time is 20-30 min.
  9. 9. The method for preparing the PP resin foaming optical diffusion plate according to claim 7, wherein the drying temperature is 90-110 ℃ and the drying time is 6-8 hours.

Description

PP resin foaming optical diffusion plate and preparation method thereof Technical Field The invention relates to the technical field of manufacturing of optical diffusion plates, in particular to a PP resin foaming optical diffusion plate and a preparation method thereof. Background The light diffusion plate is also called a light homogenizing plate, is mature and applied to the fields of liquid crystal display and LED illumination at present, and has the main function of fully diffusing incident light and realizing softer and uniform irradiation effect. However, the conventional GPPS material for manufacturing an optical diffusion plate generally has the problems of poor heat resistance and poor impact resistance, and the diffusion plate is easy to deform due to heating of a light source when used for a long time, so that the service life is influenced, and the diffusion plate is easy to damage due to impact in the transportation process, so that the diffusion plate is bad. Polypropylene (PP) is a general thermoplastic obtained by polymerizing propylene, and has the characteristics of low price, strong impact resistance, good heat and chemical resistance, high mechanical strength and the like compared with other general thermoplastics because of rich sources of raw materials and simpler synthesis process, so that the polypropylene (PP) is widely applied to the fields of automobiles, electric appliances, packaging and daily necessities. Patent document CN220320523U discloses a corrosion-resistant polypropylene PP tube, patent document CN213200686U discloses a PP polypropylene environment-friendly regenerated woven bag, but no report is available at present on a PP resin foaming optical diffusion plate. Disclosure of Invention In order to solve the problems, the PP resin foaming optical diffusion plate provided by the invention has the advantages of stable integral structure, good optical performance and low manufacturing cost, and comprises an upper layer, a middle layer and a lower layer, wherein the upper layer and the lower layer are arranged on two sides of the middle layer, the thickness ratio of the upper layer to the lower layer is 1 (7-9), the upper layer and the lower layer are the same, the upper layer comprises, by mass, 69-85 parts of PP resin, 10-20 parts of PP-g-MAH resin, 1-3 parts of copolymer microspheres, 3-5 parts of flame retardant, 0.3-0.7 part of antioxidant, 0.08-0.16 part of mineral oil, 0.4-1.2 parts of light stabilizer, 0.2-0.9 part of ultraviolet absorber and 0.02-0.04 part of whitening agent, and the middle layer comprises, by mass, 83-93 parts of GPPS resin, 5-13 parts of foaming agent, 0.4-1.2 part of antioxidant, 0.23-0.27 part of mineral oil, 0.6-1.4 part of light stabilizer, 0.4-1.16 part of ultraviolet absorber and 0.43-43 part of ultraviolet light absorber. Preferably, the antioxidant is at least one of antioxidant 1024, antioxidant 1010 or antioxidant 1076. Preferably, the mineral oil is silicone oil or liquid paraffin. Preferably, the light stabilizer is any one or more selected from the group consisting of light stabilizer 622, light stabilizer 770 and light stabilizer 944. Preferably, the ultraviolet absorber is selected from one or more of ultraviolet absorbers UV-327, UV-329 and UV-531. Preferably, the whitening agent is the fluorescent whitening agent CBS-127. The invention also provides a preparation method of the PP resin foaming optical diffusion plate, which comprises the following steps: preparing copolymer microspheres; uniformly mixing 1-3 parts of copolymer microspheres with 69-85 parts of PP resin, 10-20 parts of PP-g-MAH resin, 3-5 parts of flame retardant, 0.3-0.7 part of antioxidant, 0.08-0.16 part of mineral oil, 0.4-1.2 parts of light stabilizer, 0.2-0.9 part of ultraviolet absorber and 0.02-0.04 part of brightening agent to obtain a mixture a; Uniformly mixing 83-93 parts of GPPS resin, 5-13 parts of foaming agent, 0.4-1.2 parts of antioxidant, 0.23-0.27 part of mineral oil, 0.6-1 part of light stabilizer, 0.4-1.1 parts of ultraviolet absorbent and 0.37-0.43 part of whitening agent to obtain a mixture b; Putting the mixture a and the mixture b into a single screw extruder according to the mass part ratio of 2 (3-5), heating, melting, three-layer co-extrusion and embossing to form a finished product; The temperature of each zone of the single-screw extruder is 180-190 ℃, 190-200 ℃, 210-220 ℃, 225-235 ℃, 215-225 ℃, 210-220 ℃, 205-215 ℃ and 310kg/h. Preferably, the preparation of the copolymer microsphere comprises the following steps: Respectively dissolving 30-50 parts of maleic anhydride, 45-55 parts of styrene and 5-15 parts of azodiisobutyronitrile in 150-250 parts of isoamyl acetate, introducing nitrogen for 30-40 min, heating in a 70 ℃ water bath for 4-6 h, centrifugally separating the suspension after reaction, removing the supernatant, dispersing the solid in n-hexane, washing, filtering, collecting filter residues, and drying the filter residue