Low outgassing multilayer tubing

By using a multilayer structure composed of low-exudation modified polyamide 6 material and ethylene-vinyl alcohol copolymer material, the problems of exudate accumulation and permeability in single-layer polymer oil pipelines are solved, achieving high wear resistance and barrier effect, and preventing environmental pollution.

CN224860250UActive Publication Date: 2026-10-16SHANGHAI CHINAUST AUTOMOTIVE PLASTICS CO LTD
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Patent Information

Application Number
CN202522520768.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-11-27
Publication Date
2026-10-16
Estimated Expiration
2035-11-27

AI Technical Summary

Technical Problem

Existing single-layer polymer oil pipelines are prone to leaching, leading to the accumulation of precipitates, pipeline blockage, and poor permeability resistance, making it difficult to prevent the seepage of oil and evaporating substances, which can easily cause environmental pollution.

Method used

A multi-layer structure is formed by using low-exudation modified polyamide 6 as the low-exudation layer, ethylene-vinyl alcohol copolymer as the barrier layer, and combining a wear-resistant layer of aliphatic polyamide material with an adhesive layer of polyamide-based adhesive material to improve wear resistance and barrier properties.

Benefits of technology

It effectively reduces the precipitation of small molecules, prevents fuel vapor penetration, improves the wear resistance and overall robustness of the pipe wall, prevents environmental pollution, and meets high permeability standards.

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Abstract

The application discloses a low-extraction multilayer pipe, which comprises a low-extraction group and a wear-resistant layer, the low-extraction group comprises a low-extraction layer and a barrier layer, the barrier layer is arranged at the outer periphery of the low-extraction layer, wherein the low-extraction layer is implemented by a low-extraction modified polyamide 6 material, a low-extraction modified polyamide 1012 material or a low-extraction modified polyamide 612 material, and the barrier layer is implemented by an ethylene-vinyl alcohol copolymer material, and the wear-resistant layer is arranged at the outer periphery of the barrier layer. Based on the characteristics that the low-extraction modified polyamide 6 material has low extraction and the ethylene-vinyl alcohol copolymer material has barrier property, the low-extraction layer and the barrier layer of the application are complementary, the small molecule extraction of the contact surface with fuel is reduced, the fuel vapor permeation is effectively blocked, the double protection effect of low extraction and high barrier is formed, and a stable barrier for the fluid flowing through the low-extraction multilayer pipe is provided.
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