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Polycarbonate composition having light diffusion characteristics and preparation method thereof

A technology of polycarbonate and composition, which is applied in the field of polycarbonate composition with light diffusion characteristics and its preparation, can solve the problems of strict preparation requirements, limitations, and complicated preparation of raw materials, and achieve high light diffusion characteristics and high light transmission rate effect

Inactive Publication Date: 2012-03-14
SHANGHAI KUMHO SUNNY PLASTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] JP378106 discloses a film with a sea-island structure prepared by using two thermoplastic materials with different refractive indices, which has high light transmittance and high astigmatism properties, but its preparation raw materials are complex and limited to film products
CN1249461C discloses a method of using inorganic particles as light diffusion medium to spray transparent film, but repeating this method, its light transmittance drops significantly
JP242862 discloses a material prepared using cyclic polyolefin resin as a light diffusing agent, which has high light transmittance and high astigmatism characteristics, but the preparation process of cyclic polyolefin resin is complicated and the preparation requirements are strict
JP168904 discloses a method to avoid material birefringence, but its light transmittance drops significantly

Method used

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  • Polycarbonate composition having light diffusion characteristics and preparation method thereof
  • Polycarbonate composition having light diffusion characteristics and preparation method thereof
  • Polycarbonate composition having light diffusion characteristics and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0027] Use the following raw materials:

[0028] PC-1: LG-DOW Caliber 200-10;

[0029] PC-2: LG-DOW Caliber 201-30;

[0030] L-1: BaSO 4 , (Sachtleben, the particle size is 4 μm, and the refractive index is 1.64);

[0031] L-2: EXL5136, ACR light diffusing agent, (ROHMHAAS, particle size 5μm, refractive index 1.54);

[0032] L-3: Silicone-PMMA-GMA light diffusing agent, (Shanghai Rizhisheng; particle size is 2.5μm, refractive index is 1.54);

[0033] Additives: IG-1010: IG-168 is a 2:3 mixture.

[0034] Formulation composition is as shown in table 1:

[0035] Table 1

[0036]

[0037] The polycarbonate and the light diffusing agent are stirred and mixed evenly by a high-speed mixer to obtain a mixture, which is fed into the twin-screw extruder from the main feeder, and then additives are added to control the length-to-diameter ratio of the twin-screw extruder to 32:1. The temperature is 220° C., and the screw speed is 250 rpm for extrusion and pelletization to obtain...

Embodiment 7

[0053] A preparation method of a polycarbonate composition with light diffusion properties, the method may further comprise the steps:

[0054] (1) Prepare raw materials according to the following components and parts by weight:

[0055]Using 90kg polycarbonate and 10kg light diffusing agent as raw materials, the mass average molecular weight of polycarbonate is 10000, the melt index at 300°C is 1g / 10min, and the light diffusing agent is silicone resin grafted polymethacrylic acid Copolymer of methyl ester-glycidyl ester (PMMA-GMA), the light diffusing agent is the core-shell structure of PMMA-GMA-coated silicone resin, the grafted functional group of silicone resin is methyl, and the quality of PMMA-GMA resin is The average molecular weight is 10,000, the mass average molecular weight of the silicone resin is 20,000, the refractive index of the light diffusing agent is 1.4, the particle size is 1 μm, the weight ratio of the silicone resin to the shell PMMA-GMA resin is 30:70,...

Embodiment 8

[0058] A preparation method of a polycarbonate composition with light diffusion properties, the method may further comprise the steps:

[0059] (1) Prepare raw materials according to the following components and parts by weight:

[0060] Using 92kg polycarbonate and 8kg light diffusing agent as raw materials, the mass average molecular weight of polycarbonate is 15000, the melt index at 300°C is 3g / 10min, and the light diffusing agent is silicone resin grafted polymethacrylic acid Copolymer of methyl ester-glycidyl ester (PMMA-GMA), the light diffusing agent is the core-shell structure of PMMA-GMA-coated silicone resin, the grafted functional group of silicone resin is methyl, and the quality of PMMA-GMA resin is The average molecular weight is 20,000, the mass average molecular weight of the silicone resin is 40,000, the refractive index of the light diffusing agent is 1.42, the particle size is 3 μm, the weight ratio of the silicone resin to the shell PMMA-GMA resin is 50:50...

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Abstract

The invention relates to a polycarbonate composition having light diffusion characteristics and a preparation method thereof. The composition comprises the following ingredients: 90-99.9 weight portions of polycarbonate and 0.1-10 weight portions of light diffusant, prepared by the following steps: uniformly mixing polycarbonate and light diffusant with stirring through a high speed mixer to obtain a mixture, sending the mixture in a double screw extruder through a primary feeding pipe, carrying out extrusion with controlling the length-diameter ratio to 20-90:1, the screw temperature of 200-350 DEG C and the screw rotating speed of 200-700 rpm and pelletizing. Compared with the prior art, the composition prepared by using the coreshell structure of coating organic silicone resin on PMMA-GMA as the light diffusant has the advantages of high light transmittance, highlight diffusion characteristic, no glare, and easy preparation and the like, and can be used in film, sheet material and injection molding.

Description

technical field [0001] The invention relates to a polymer composition and a preparation method thereof, in particular to a polycarbonate composition with light diffusion properties and a preparation method thereof. Background technique [0002] The inherent characteristics of LED are: 1. Small size, LED is basically a small chip encapsulated in epoxy resin, so it is very small and very light; 2. Low power consumption, LED power consumption is quite low , Generally speaking, the working voltage of LED is 2-3.6V; the working current is 0.02-0.03A. That is to say: it consumes no more than 0.1W of electricity. 3. Long service life. Under proper current and voltage, the service life of LED can reach 100,000 hours; 4. High brightness and low heat. LED uses cold light-emitting technology, and the calorific value is much lower than that of ordinary lighting fixtures; 5. Environmental protection , LEDs are made of non-toxic materials, unlike fluorescent lamps containing mercury tha...

Claims

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Application Information

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IPC IPC(8): C08L69/00C08L51/08B29B9/06B29C47/92B29C48/92
CPCB29C48/625B29C48/04B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885
Inventor 李强胡沁杨春华罗明华辛敏琦
Owner SHANGHAI KUMHO SUNNY PLASTICS