Polycarbonate composition and preparation method
A technology of polycarbonate and composition, which is applied in the field of highly transparent polycarbonate composition and preparation, can solve the problems of uncontrollable melanin particle size, low transparency of functional film, and difficulty in industrial promotion, etc., to achieve high transparency of harmful ultraviolet rays Good lightness, transparency, and broad application prospects
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[0044] Preparation of melanin nanoparticles:
[0045] (1) Preparation of melanin 1: buy cuttlefish from the market (Nanchan Temple Vegetable Market in Wuxi), take cuttlefish ink, and centrifuge to obtain melanin 1 Ink sacs from North Pacific squid were obtained using high-speed centrifugation. The average diameter is about 200nm
[0046](2) Preparation of melanin 2: Weigh 0.18g of dopamine (provided by Shanghai Aladdin Biochemical Technology Co., Ltd., specification: AR) and dissolve it in 100g of deionized water, and feed 0.37g of oxygen, (the molar ratio of dopamine to oxygen 1:10) to adjust the pH value of the solution to 8.4, 50 ° C, after stirring for 5 hours, the reaction ended, after centrifugation, to obtain melanin 2 . The average diameter is about 180nm.
[0047] (3) Preparation of melanin 3: Weigh 0.2 g of dopa (provided by Shanghai Aladdin Biochemical Technology Co., Ltd., specification: AR) and 2.4 g of sodium persulfate (Sinopharm Chemical Reagent Co., Ltd.,...
Embodiment 1
[0052] Weigh 1000g of polycarbonate (Saudi Basic Plastics, model CH6410), 10g of melanin 3 and 0.5g of 4,4'-thiobis(6-tert-butyl m-cresol) and fully mix them in a high-speed mixer uniform, and then put the obtained premixed material into a twin-screw extruder, control the processing temperature at 255° C., and obtain polycarbonate composition pellets through melting, plasticizing and granulating. Subsequently, the composition was vacuum-dried at 80° C. for 6 hours, and then injection molded (the cylinder temperature was 250° C., and the mold temperature was 100° C.), to obtain a sample sheet with a thickness of 3.0 mm.
Embodiment 2
[0054] Weigh 1000g polycarbonate (Saudi Basic Plastics, model 141R-701), 10g melanin 1 and 0.5g 4,4'-thiobis(6-tert-butyl-3-methylphenol) at high speed Mix thoroughly and evenly in a mixer, then put the obtained premixed material into a twin-screw extruder, control the processing temperature at 255° C., and obtain polycarbonate composition granules through melting, plasticizing and granulating. Subsequently, the composition was vacuum-dried at 80° C. for 6 hours, and then injection molded (the cylinder temperature was 250° C., and the mold temperature was 100° C.), to obtain a sample sheet with a thickness of 3.0 mm.
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