A kind of polycarbonate-based special flickering effect resin composition and its preparation method

Abstract

The invention relates to a polycarbonate-based resin composition with a special flickering effect and a preparation method thereof. The composition comprises the following raw materials in parts by weight: 90-99 parts of polycarbonate, 1.0-10 parts of polyolefin, 0.01-3.0 parts of glass pearlescent pigment, 0.05-0.5 part of antioxidant and 0.05-0.5 part of lubricant. The polycarbonate-based resin composition with the special flickering effect is obtained by drying the raw materials in an oven at the temperature of 90 DEG C for 5-8h, premixing in a high mixing machine, performing melt extrusion through a twin-screw extruder, cooling, and then, granulating. A product prepared by using the material provided by the invention has the advantages of smooth surface, strong three-dimensional hierarchy and no rough points on the surface, and can be used for preparing appearance parts of household electrical appliances, office products and various daily necessities with relatively high appearance and performance requirements.

Description

technical field [0001] The invention relates to a scintillation resin composition and a preparation method thereof, in particular to a polycarbonate-based special scintillation effect resin composition and a preparation method thereof. Background technique [0002] Adding glass pearlescent pigments to transparent resin substrates can achieve a shimmering effect, thereby expanding its application in the fields of home appliances, daily decorations, and appearance packaging materials. At present, the scheme of adding different special effect pigments to the resin to achieve the spray-free effect has been applied in the market. The matrix materials of this kind of scheme are mainly based on ABS, PMMA, PP, PE, ASA, AES, etc. and their compositions, and the special effect pigments mainly used are glitter powder, aluminum powder, copper powder, zinc powder, natural or synthetic mica pearlescent Wait. [0003] Polycarbonate PC is a kind of engineering resin with excellent compreh...

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Problems solved by technology

[0003] Polycarbonate PC is a kind of engineering resin with excellent comprehensive performance, especially its high heat resistance, high impact resistance and transparency, which make it occupy advantages in many fields. However, to achieve the special effect of using PC as the base material, it needs The large amount of pigment added can easily lead to serious flow marks and weld line defects, which are much more serious than those using ABS, PMMA and PP as the base material, which is mainly due to the high viscosity of PC leading to poor processability related

[0004] Since a low amount of glass pearlescent pigment can achieve a better sparkling effect without producing obvious flow marks and weld lines, glass pearlescent pigments with larger particle sizes are usually added to PC to achieve the sparkling effect, but the surface active groups of glass pearlescent It is easy to cause degradation of PC during thermal processing, thus forming obvious pitting defects on the surface

CN102516736A records adopting high molecular weight polyethylene glycol to coat and modify pearlescent pigments, so that small molecules or macromolecules that are not reactive to PC are grafted on its surface groups, but there are two problems in this method: one is to graft The branching efficiency is low, it is difficult to passivate all the active groups completely, and the problem of pitting cannot be completely solved; the second is that after the grafted substance is attached to the pearlescent surface, the refractive index changes, causing it to produce partial diffuse reflection, and the flickering feeling is obvious Reduced, and it is easy to cause the thinner glass pearls to break, and the process is more cumbersome

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