Transparent nonyellowing polycarbonate composition and preparation method
A polycarbonate, non-yellowing technology, applied in the field of transparent non-yellowing polycarbonate composition and preparation, can solve the problems of yellowing, equipment investment and high cost, achieve low cost, simple preparation method, high light transmittance Effect
Active Publication Date: 2015-03-04
SHANGHAI KUMHO SUNNY PLASTICS
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- Description
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Problems solved by technology
Because the technical solution uses a chain extender, it can repair the broken chain caused by the degradation of polycarbonate to a certain extent, but the yellowing problem will still occur in the processed product for a long time
CN102276821 discloses a polycarbonate copolymer, the polycarbonate copolymer of the invention contains structural units of dihydroxy compounds and structural units derived from alicyclic dihydroxy compounds, and the polycarbonate of this technical solution has excellent transparency nature, but this scheme uses polymerization and copolymerization technology, and the investment and cost of equipment are relatively high
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0028] The transparent non-yellowing polycarbonate composition of the present embodiment, its preparation method is as follows:
[0029] The polycarbonate and deionized water are mixed according to the weight ratio shown in Table 1, stirred and mixed evenly by a high-speed mixer, and fed into a twin-screw extruder from the main feed, extruded and pelletized to obtain the product. The length-to-diameter ratio of the twin-screw extruder is 20:1, the screw temperature of each section is 200°C, the screw speed is 200rpm / min, and the vacuum degree is -0.05Mpa.
Embodiment 2
[0031] This example is the same as Example 1, except that the length-to-diameter ratio of the twin-screw extruder is 32:1, the screw temperature of each section is 220°C, the screw speed is 250rpm / min, and the vacuum degree of the extruder is -0.075Mpa.
Embodiment 3
[0033] This example is the same as Example 1, except that the length-to-diameter ratio of the twin-screw extruder is 45:1, the screw temperature of each section is 320°C, the screw speed is 550rpm / min, and the vacuum degree of the extruder is It is 0.095Mpa.
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Abstract
The invention discloses a transparent nonyellowing polycarbonate composition and a preparation method. The composition comprises the following components in part by weight: 99 to 99.9 parts of polycarbonate, 0.1 to 1 part of deionized water and 0.1 to 0.2 part of antioxidant. The preparation method of the transparent nonyellowing polycarbonate composition comprises the following steps of: preparing the materials; placing the prepared components into a high speed mixer and uniformly stirring and mixing to obtain the mixed materials; and placing the mixed materials into a double-screw extruder and carrying out melt extrusion and pelletizing to obtain the transparent nonyellowing polycarbonate composition. Compared with the prior art, the preparation method is simple and has low cost and the prepared composition has the characteristics of high light transmittance, no yellowing phenomenon after long-term injection molding and the like and can be suitable for products of advertising lamp box boards, sunlight panels, electronic and electrical visual windows and the like.
Description
technical field [0001] The invention belongs to the field of polycarbonate material preparation, and in particular relates to a transparent non-yellowing polycarbonate composition and a preparation method. Background technique [0002] Polycarbonate material has high rigidity, high toughness, and high heat resistance. It is a general-purpose engineering plastic with the highest comprehensive performance, and it also has the characteristics of transparency. Widely used in advertising light box panels, sunlight panels, electronic and electrical windows and other fields. However, the processing performance of polycarbonate material is poor, and it needs to be injection molded at about 300°C. Under high temperature and high shear processing conditions, the ester bond of polycarbonate is very prone to chain scission, and slight degradation will lead to transparency. Yellowing and other adverse phenomena appear in the product, which limits the application of this material in larg...
Claims
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IPC IPC(8): C08L69/00C08K5/526C08K5/134B29C47/92B29C48/92
CPCB29C47/92B29C48/04B29C48/40B29C48/625B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 李强柏莲桂李文强罗明华辛敏琦
Owner SHANGHAI KUMHO SUNNY PLASTICS