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

Inactive Publication Date: 2017-10-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is complicated to operate and difficult to be promoted in industry
[0007] Publication number CN101233196A discloses a functional film containing melanin and its preparation method, but the particle size of the melanin prepared by this method is uncontrollable and the transparency of the functional film is low

Method used

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  • Polycarbonate composition and preparation method

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Effect test

preparation example Construction

[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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Abstract

The invention discloses a polycarbonate composition and a preparation method. The composition comprises polycarbonate and melanin, or polycarbonate, melanin and an antioxidant, wherein based on 100 parts by weight of the polycarbonate, the melanin is 0.05-10 parts by weight and the antioxidant is 0.01-1 part by weight, and the melanin is selected from a group which consists of naturally extracted melanin, and melanoid prepared by chemical synthesis and a biological fermentation method. The preparation method comprises one of the following steps: (a) melting and blending polycarbonate, melanin and the antioxidant according to the usage amounts to prepare the polycarbonate composition; and (b) dissolving polycarbonate into an organic solvent, adding melanin of the usage amount, performing uniform stirring and mixing; and performing drying to obtain the polycarbonate composition. The polycarbonate composition provided by the invention can enhance the ultraviolet light blocking ability and light stability of polycarbonate at the same time and increases the service life of the polycarbonate.

Description

technical field [0001] The invention relates to the field of compositions, in particular to a highly transparent polycarbonate composition with ultraviolet blocking ability and high weather resistance and a preparation method. Background technique [0002] Ultraviolet light is divided into short-wave UVC (200-280nm), medium-wave UVB (280-320nm) and long-wave UVA (320-400nm) according to the length of its wavelength. The sun is the main source of natural ultraviolet rays. Ultraviolet rays travel through the atmosphere and eventually reach the ground. Appropriate amount of ultraviolet rays can promote the metabolism of minerals in the body and the formation of vitamin D, and has the function of sterilization and disinfection, but long-term ultraviolet radiation can easily damage the eyes, accelerate skin aging, induce skin diseases and even cause cancer. At the same time, the increased energy of ultraviolet rays can destroy the chemical bonds of polymers and trigger auto-oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08K5/00C08K5/375C08K5/134C08K5/526
CPCC08K5/00C08K5/1345C08K5/375C08K5/526C08K2201/003C08K2201/011C08L2201/10C08L69/00
Inventor 东为富汪洋李婷马丕明陈明清
Owner JIANGNAN UNIV
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