High-strength, high-toughness and high-thermal-stability PA66 composite material and preparation method thereof

By leveraging the synergistic effects of PA66 resin, modified chopped glass fiber, toughening agent, composite heat resistant agent, and lubricant, combined with a low-speed process, a high-strength, high-toughness, and high-thermal-stability PA66 composite material was prepared. This solved the performance degradation problem of glass fiber reinforced PA66 material under high-temperature environments, making it suitable for complex structural components in high-temperature and high-strength environments.

CN122168011APending Publication Date: 2026-06-09哈尔滨赛尚密封技术有限公司
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Patent Information

Application Number
CN202610384893.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-26
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing glass fiber reinforced PA66 materials generally have high strength but insufficient toughness, and insufficient thermal stability at high temperatures, making it difficult to maintain performance for a long time at high temperatures.

Method used

The material is made by using PA66 resin, modified chopped glass fiber, toughening agent, composite heat resistant agent, high-efficiency nucleating agent, lubricant and specific process to improve the strength, toughness and thermal stability of the material through synergistic effect. The preparation methods include premixing, melt blending and extrusion granulation, and a specific low-speed process is used to protect the structural integrity of the components.

Benefits of technology

It achieves high fracture strength, good toughness and excellent long-term thermal stability, and is suitable for high temperature and high intensity working conditions, especially for automotive and aero-engine components.

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Abstract

The invention discloses a high-strength, high-toughness and high-thermal-stability PA66 composite material and a preparation method thereof.The PA66 composite material is composed of PA66 resin, modified chopped glass fibers, a flexibilizer, a composite heat-resistant agent, an efficient nucleating agent, color masterbatch and a lubricant. The preparation method comprises the following steps: (1) mixing the PA66 resin, the composite heat-resistant agent, the efficient nucleating agent, the flexibilizer, the color master batch and the lubricant in a high-speed mixer to obtain a premix; (2) the premix is added from a main feeding port of a double-screw extruder, the modified chopped glass fibers are introduced from a side feeding port of the double-screw extruder, and the side feeding port is located behind a melting section of a barrel and in front of a vacuum exhaust port; and carrying out melt mixing, vacuum devolatilization, extrusion, cooling and grain-sized dicing to obtain composite material particles. The PA66 composite material has high breaking strength, good toughness and excellent long-term thermal stability, and is suitable for high-temperature and high-strength working conditions.
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