Multilayer composite polypropylene color master batch and preparation method thereof

By using a three-layer composite polypropylene masterbatch structure and fluidized bed technology, the problem of insufficient low-temperature impact resistance of polypropylene pipes has been solved, achieving efficient dispersion and antioxidant protection, and improving the low-temperature toughness and production efficiency of the pipes.

CN121362406APending Publication Date: 2026-01-20浙江中财管道科技股份有限公司
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Patent Information

Application Number
CN202511729118.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-24
Publication Date
2026-01-20

AI Technical Summary

Technical Problem

Existing polypropylene pipes have insufficient impact resistance at low temperatures, and existing masterbatches are unevenly dispersed, have low toughening efficiency, and have not effectively solved the interfacial compatibility problem.

Method used

The material adopts a three-layer composite polypropylene masterbatch structure. The inner layer is a composite toughening agent of β-crystalline polypropylene and SIBS/POE/EPDM, the middle layer is a color powder coated with hyperbranched polyesteramide, and the outer layer is an antioxidant protective layer. Uniform coating is achieved through fluidized bed technology, and the outer layer is formed by electrostatic spraying.

Benefits of technology

It improves the impact strength of pipes at low temperatures, reduces color difference, lowers extrusion torque, adapts to high-speed production, and improves production efficiency.

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Abstract

The invention discloses a multi-layer composite polypropylene color master batch and a preparation method thereof.The multi-layer composite polypropylene color master batch comprises an inner layer, a middle layer and an outer layer, the inner layer is coated with the middle layer, the middle layer is coated with the outer layer, matrix resin, a composite toughening agent and an interface modifier are subjected to melt blending in a double-screw extruder, nano reinforcing filler is added, extrusion granulation is performed, and the multi-layer composite polypropylene color master batch is obtained. Carrier resin, hyperbranched polyesteramide and a toner pre-dispersion body are mixed at a high speed and then uniformly coated on the outer surface of the inner layer through fluidized bed equipment, and a mixture of a weather-proof additive and a lubricant is attached to the outer surface of the middle layer by adopting an electrostatic spraying process to form the outer layer. According to the multi-layer composite color master batch, the matrix resin and the composite toughening agent have a synergistic effect, so that the impact strength of the color master batch is improved, the cavity structure of hyperbranched polyesteramide is coated with the toner, the silane is used for treating the nano filler to reduce agglomeration and chromatic aberration, the outer layer delays aging, the lubricant reduces the extrusion torque, and the multi-layer composite color master batch is adaptive to a high-speed pipe production line.
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