Resin composition and preparation method thereof

Abstract

The invention relates to a resin composition and a preparation method thereof. The resin composition comprises: by weight, 100 parts of resin, 0.2 to 3.0 parts of a bridge structure modifier, 0.3 to 4.0 parts of metal pigment, 0.3 to 2.0 parts of one or more lubricants, 0.1 to 1.0 part of one or more anti-oxidants and 0.1 to 0.3 parts of mineral oil. The preparation method comprises the following steps of mixing a part of the resin, the bridge structure modifier, the one or more lubricants and the one or more anti-oxidants according a certain ratio to obtain a mixture I, pre-mixing the rest of the resin and the mineral oil, adding the metal pigment into the mixture of the rest of the resin and the mineral oil to obtain a mixture II, adding the mixture I and the mixture II into a double screw extruder respectively from an upper feed inlet and a lower feed inlet, and carrying out melting extrusion, drawing, cooling and cutting to obtain the resin composition. The resin composition obtained by the preparation method has an excellent appearance, and solves the problem that when transparent or semitransparent resin is mixed with metal pigment having a certain length-diameter ratio, a streamline or a fusion line can be produced. The resin composition can be utilized for production of streamline-free resin compositions which are flashy or have metal luster.

Description

technical field [0001] The invention relates to a polymer resin and a preparation method thereof, in particular to a resin composition and a preparation method thereof. Background technique [0002] In recent years, consumer products have created a strong demand for plastics with unique colors and appearances. For example, the current appearance products with shimmering effect and metallic texture are more and more favored by consumers. Compared with the traditional single tone, this unique appearance can bring great visual impact to people, so that consumers can enjoy For its aesthetic design, we call this material Aesthetic Resin. [0003] The traditional technical solution of aesthetic resin is to post-process the molded product. The most used is the spraying process. Pearlescent paint, metallic paint, etc. can be selected according to the needs of the product. However, there are many limitations in the spraying process, such as complex procedures and high requirements ...

AI Technical Summary

Problems solved by technology

[0005] The geometric shape of pigment particles often has a great influence on the optical effect of the product. For example, flake or silver dollar pigments are often polyhedral. During the molding process, the flow resistance of this type of pigment increases when encountering thin walls, screw holes or cavities. The accumulation of pigments in these areas and the lack of pigments in other areas greatly affect the appearance of the product; in addition, the vicinity of the gate and the surface of the product in injection molding are high-shear areas, which easily lead to the orientation of flake pigments, resulting in unsightly changes due to reflectivity changes. accepted colors

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