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CN-121991480-A - Composite master batch material for diffusion plate and preparation method thereof

CN121991480ACN 121991480 ACN121991480 ACN 121991480ACN-121991480-A

Abstract

The invention relates to the technical field of diffusion plate master batches, in particular to a composite master batch material for a diffusion plate and a preparation method thereof, and the composite master batch material comprises, by weight, 75-85 parts of polycarbonate, 15-25 parts of filler, 1-2 parts of titanate coupling agent, 1-2 parts of maleic anhydride grafted polyolefin, 0.3-0.5 part of heat stabilizer and 0.2-0.4 part of light stabilizer. According to the invention, the flaky magnesium fluoride subjected to the synergistic surface treatment of the pyrophosphoric acid type titanate and the epoxy group end-capped polysiloxane is adopted as a filler core, and the additive compounded by the styrene maleic anhydride copolymer and the acrylic ester impact modifier is introduced, so that the interface binding force of the filler and the polycarbonate matrix is obviously enhanced, and the strong interface binding can effectively transfer and disperse stress, so that the finally prepared diffusion plate has excellent impact resistance and bending strength, the mechanical stress damage resistance capability is obviously improved, and the mechanical service life is prolonged.

Inventors

  • LIU XUE
  • JI FEI
  • LI QIANWEI
  • BAO YUE

Assignees

  • 合肥宇皓新型光学材料有限公司

Dates

Publication Date
20260508
Application Date
20260310

Claims (10)

  1. 1. The composite master batch material for the diffusion plate is characterized by comprising, by weight, 75-85 parts of polycarbonate, 15-25 parts of filler, 1-2 parts of titanate coupling agent, 1-2 parts of maleic anhydride grafted polyolefin, 0.3-0.5 part of heat stabilizer and 0.2-0.4 part of light stabilizer; the filler is prepared by the following method: s1, preparing powder, wherein the raw materials for preparing the powder comprise flaky magnesium fluoride, epoxy end-capped polysiloxane, absolute ethyl alcohol and mixed solution; s2, preparing an additive, wherein the raw materials for preparing the additive comprise styrene-maleic anhydride copolymer, acrylic ester impact modifier and polycarbonate powder, and the mass of the additive is 45-50% of that of the powder; And S3, mixing, namely mixing the powder and the additive to obtain the filler.
  2. 2. The method for preparing the powder is characterized in that flaky magnesium fluoride is sent into a mixer, the temperature is set to be raised to 100-110 ℃, the stirring speed is 40-60rpm, the constant temperature stirring treatment is carried out for 30-50min, the treatment liquid is sprayed in a stirring state, the constant temperature stirring treatment is continued for 5-10min, the temperature is waited to be reduced to 90-100 ℃, epoxy terminated polysiloxane is added, the constant temperature stirring treatment is continued for 10-15min, the temperature reduction rate is set to 1-2 ℃ per min, the temperature is reduced to 45-50 ℃ to obtain coarse materials, the coarse materials are added into absolute ethyl alcohol and are uniformly mixed to obtain suspension, the suspension is placed into a constant temperature oil bath at 40 ℃, the stirring state is kept, the mixed liquid is added, the temperature is kept for 3-4h, the obtained product is pumped and filtered to obtain solid matters, the obtained product is sent into an oven for drying treatment for 10-12h at 80-85 ℃ by using the volume ratio of 1:1, and the obtained product is grinded and sieved to obtain the powder.
  3. 3. The composite master batch material for the diffusion plate according to claim 2, wherein the mass of the treatment liquid is 12-15% of the mass of the flaky magnesium fluoride, the mass of the epoxy-terminated polysiloxane is 4-6% of the mass of the flaky magnesium fluoride, the mass ratio of the coarse material to the absolute ethyl alcohol is 1:3-4, and the mass of the mixed liquid is 20-25% of the mass of the suspension.
  4. 4. The composite master batch material for the diffusion plate according to claim 2, wherein the treatment liquid is prepared by mixing pyrophosphoric acid type titanate and absolute ethyl alcohol according to a mass ratio of 1:6-8.
  5. 5. The composite master batch material for the diffusion plate according to claim 2, wherein the mixed solution is prepared by dissolving polyacrylic acid in deionized water according to a mass ratio of 1:50, stirring until the polyacrylic acid is completely dissolved, and regulating the pH value to 8-9 by using ammonia water.
  6. 6. The composite masterbatch material for diffusion plates according to claim 1, characterized in that the additive is prepared by adding a styrene-maleic anhydride copolymer, an acrylic ester impact modifier and polycarbonate powder into a high-speed mixer, mixing for 6-10min at 90-100 ℃ and 300-500rpm, transferring the obtained product into a twin-screw extruder, setting the extrusion temperature at 235-245 ℃, the screw rotation speed at 80-120rpm, melt blending extrusion, water cooling, granulating, grinding and sieving the obtained product by 200 meshes, and obtaining the additive.
  7. 7. The composite masterbatch material for diffuser plates according to claim 6, wherein the mass ratio of the styrene-maleic anhydride copolymer, the acrylic impact modifier and the polycarbonate powder is 1:0.4-0.5:6-8.
  8. 8. The composite master batch material for a diffusion plate according to claim 1, wherein the mixing treatment method comprises the steps of adding the powder and the additive into a high-speed mixer, mixing at a temperature of 95-105 ℃ for 8-12min at 400-600rpm, and cooling the mixed material to room temperature to obtain the filler.
  9. 9. The composite master batch material for the diffusion plate according to claim 1, wherein the titanate coupling agent is selected from the group consisting of a titanate coupling agent GR311, the heat stabilizer is selected from the group consisting of Irgafos168, and the light stabilizer is selected from the group consisting of Tinuvin770.
  10. 10. The method for preparing the composite masterbatch material for the diffusion plate according to any one of claims 1 to 9, which is characterized by comprising the following steps of pre-drying polycarbonate in an oven at 120 ℃ for 4 to 6 hours, adding the pre-dried polycarbonate, filler, titanate coupling agent, maleic anhydride grafted polyolefin, heat stabilizer and light stabilizer into a mixer, stirring at 400 to 600rpm for 10 to 20 minutes, feeding the obtained product into a double-screw extruder, and carrying out melt blending extrusion, water cooling and pelletizing at the set temperature ranges of 220 to 240 ℃,250 to 260 ℃,260 to 270 ℃ and 255 to 265 ℃ respectively to prepare the composite masterbatch material for the diffusion plate.

Description

Composite master batch material for diffusion plate and preparation method thereof Technical Field The invention relates to the technical field of diffusion plate master batches, in particular to a composite master batch material for a diffusion plate and a preparation method thereof. Background The diffusion plate is a key optical element in the backlight module, has the core function of converting a point light source or a linear light source into a uniform surface light source, eliminating bright spots, improving the visual effect of display equipment, and the composite master batch material is used as a special raw material for preparing the high-performance diffusion plate, the performance of the composite master batch material directly determines the use effect of the diffusion plate, and the development of the composite master batch with excellent optical performance and long-term durability is an important research direction in the field of optical materials. In the prior art, in order to improve the mechanical property of the diffusion plate finished product, functional filler is generally introduced into the basic composite master batch material, but the introduced filler and the polymer matrix can cause weak points of the material under the condition that the interface binding force is not overcome, the stability of the mechanical property of the diffusion plate can not be ensured, and the service life of the machine still needs to be improved. Based on the above, the invention provides a composite master batch material for a diffusion plate and a preparation method thereof. Disclosure of Invention The invention aims to provide a composite master batch material for a diffusion plate and a preparation method thereof, the composite master batch material for the diffusion plate prepared by the invention not only has good mechanical properties, but also has good thermal ageing property, thereby fundamentally prolonging the service life of the diffusion plate. The composite master batch material for the diffusion plate comprises, by weight, 75-85 parts of polycarbonate, 15-25 parts of filler, 1-2 parts of titanate coupling agent, 1-2 parts of maleic anhydride grafted polyolefin, 0.3-0.5 part of heat stabilizer and 0.2-0.4 part of light stabilizer; the filler is prepared by the following method: s1, preparing powder, wherein the raw materials for preparing the powder comprise flaky magnesium fluoride, epoxy end-capped polysiloxane, absolute ethyl alcohol and mixed solution; s2, preparing an additive, wherein the raw materials for preparing the additive comprise styrene-maleic anhydride copolymer, acrylic ester impact modifier and polycarbonate powder, and the mass of the additive is 45-50% of that of the powder; And S3, mixing, namely mixing the powder and the additive to obtain the filler. Preferably, the powder preparation method comprises the steps of feeding flaky magnesium fluoride into a mixer, heating to 100-110 ℃, stirring at 40-60rpm, stirring at constant temperature for 30-50min, spraying treatment liquid in a stirring state, continuing constant temperature stirring for 5-10min, waiting for cooling to 90-100 ℃, adding epoxy end-capped polysiloxane, continuing constant temperature stirring for 10-15min, setting cooling rate to 1-2 ℃ per min, cooling to 45-50 ℃ to obtain coarse material, adding the coarse material into absolute ethyl alcohol, uniformly mixing to obtain suspension, placing the suspension into a constant temperature oil bath at 40 ℃, keeping a stirring state, adding the mixed liquid, preserving heat, stirring for 3-4h, filtering the obtained product to obtain solid, washing the obtained product with ethanol-water mixed liquid with volume ratio of 1:1 for 3 times, feeding the obtained product into an oven, drying at 80-85 ℃ for 10-12h, grinding and sieving to obtain powder. Preferably, the mass of the treatment liquid is 12-15% of the mass of the flaky magnesium fluoride, the mass of the epoxy group end-capped polysiloxane is 4-6% of the mass of the flaky magnesium fluoride, the mass ratio of coarse materials to absolute ethyl alcohol is 1:3-4, and the mass of the mixed liquid is 20-25% of the mass of the suspension. Preferably, the treatment fluid is prepared by mixing pyrophosphoric acid type titanate and absolute ethyl alcohol according to a mass ratio of 1:6-8. Preferably, the mixed solution is prepared by dissolving polyacrylic acid in deionized water according to a mass ratio of 1:50, stirring until the polyacrylic acid is completely dissolved, and regulating the pH value to 8-9 by using ammonia water to prepare the mixed solution. Preferably, the preparation method of the additive comprises the steps of adding the styrene-maleic anhydride copolymer, the acrylic ester impact modifier and the polycarbonate powder into a high-speed mixer, mixing and treating for 6-10min at 90-100 ℃ and 300-500rpm, transferring the obtained product into a double-screw extruder, setting the extr