Modified poly(p-phenyleneterephthalamide) fibers having high elongation at break and methods for making the same

By introducing diamine monomers containing diaminophenoxy functional groups and 3,4'-diaminodiphenyl ether, and adjusting the molecular chain conformation, modified poly(p-phenylene terephthalamide) fibers were prepared using a dry-jet wet spinning process. This solved the problem of low fiber elongation at break and achieved a balance between high elongation at break and breaking strength, making the fibers suitable for tires and conveyor belts.

CN120099662BActive Publication Date: 2026-03-27JIANGSU SHENGBANG NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202510433396.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-04-08
Publication Date
2026-03-27
Estimated Expiration
2045-04-08

AI Technical Summary

Technical Problem

The low elongation at break of existing poly(p-phenylene terephthalamide) fibers limits their use in applications requiring high elongation at break, such as tire crown cords and conveyor belts.

Method used

Modified poly(p-phenylene terephthalamide) fibers were prepared by introducing diamine monomers containing diaminophenoxy functional groups and 3,4'-diaminodiphenyl ether, adjusting the molecular chain conformation, and using a dry-jet wet spinning process. The temperature and filtration precision during the spinning process were controlled to avoid fiber structural defects.

Benefits of technology

It improves the breaking elongation of the fiber, maintains the breaking strength of the fiber, and can be used in industrial-scale production, suitable for tire and conveyor belt applications.

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Abstract

The present application relates to the technical field of aromatic polyamide polymer, in particular to a modified poly-p-phenyleneterephthalamide fiber with high elongation at break and a preparation method thereof.The present application introduces a small amount of 3,4'-diamino diphenyl ether and a fourth monomer containing a bis-amino phenoxy functional group during polymerization, and controls the molar ratio of the third monomer and the fourth monomer in the total amount of diamine monomer, thereby to a certain extent, the rigid molecular chain structure of the conventional p-aramid is destroyed, while the breaking strength of the fiber is maintained, the elongation at break of the polymer fiber is enhanced, the modified poly-p-phenyleneterephthalamide can still be prepared by dry spraying wet spinning process, the cost of building a new production line in the factory is saved, the process conditions and parameters are optimized, the fiber with stable elongation at break index is obtained, and the prepared fiber has an elongation at break of more than 3.6%.
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