Low-warpage PA66 material and preparation method thereof

By designing a flake-fiber composite reinforcement system and a gradient microporous buffer layer, combined with specific injection speed and hot water bath treatment, the warpage deformation problem of PA66 material during the molding process was solved, achieving the preparation of PA66 material with low warpage, high performance and low cost.

CN120842840APending Publication Date: 2025-10-28SUZHOU HANDSOME PRECISION MOULD CO LTD
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Patent Information

Application Number
CN202510783467.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-12
Publication Date
2025-10-28

AI Technical Summary

Technical Problem

PA66 material exhibits significant warping deformation during molding, leading to unstable product dimensions and reduced performance. Existing modification methods suffer from complex processes, high costs, or performance sacrifices.

Method used

A flake-fiber composite reinforcement system is adopted, which forms a 'cross-locking' structure by compounding modified mica sheets with short-cut carbon fibers in a specific ratio. Combined with a gradient microporous buffer layer and a foaming agent, a closed-cell structure is formed on the surface. The microporous elastic deformation absorbs internal stress. With the help of a three-stage injection speed and hot water bath treatment process, the fiber orientation is controlled and the processing freezing stress is eliminated.

Benefits of technology

Effectively reduce warpage, improve impact strength and long-term dimensional stability, and achieve low-warpage, high-performance and low-cost PA66 material preparation.

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Abstract

The invention provides a low-warpage PA66 material and a preparation method thereof, and the preparation method comprises the following steps: mixing PA66 resin, modified mica, short carbon fiber, oxidized polyethlene wax and a titanate coupling agent, discharging and sieving to obtain a uniform premix; extruding and granulating through double screws; performing injection molding; and carrying out hot-bath shaping to obtain the product. According to the invention, by adopting a scale-fiber composite reinforcing system, modified mica sheets (transverse shrinkage inhibition) and short carbon fibers (longitudinal reinforcement) are compounded according to a specific proportion to form a cross lock catch structure, and bidirectional shrinkage stress is counteracted, so that the warping degree is reduced; the gradient microporous buffer layer is introduced, a 50-200 [mu] m closed pore structure is formed on the surface layer through a foaming agent ethanol solution in the injection molding stage, and internal stress is absorbed through elastic deformation of micropores, so that the residual stress is reduced, the impact strength is improved, and the brittleness problem of a traditional low-warping material is avoided.
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