Preparation method of anti-yellowing high-stability bio-based 1, 5-pentamethylene diisocyanate product

By employing a synergistic stabilization system combining high-purity bio-based 1,5-pentanediisocyanate monomers with antioxidants and UV stabilizers, the problems of yellowing, storage stability, and extreme environmental adaptability of bio-based 1,5-pentanediisocyanate have been solved, achieving high stability and wide application.

CN121779280APending Publication Date: 2026-04-03GANSU YINGUANG JUYIN CHEM IND CO LTD
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Patent Information

Application Number
CN202511830783.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-06
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

Existing bio-based 1,5-pentanediisocyanate products have poor resistance to yellowing, insufficient storage stability, and weak adaptability to extreme environments. Existing improvement schemes have failed to fully solve the problems of yellowing due to photo-oxidation and thermal oxidation, short storage period, and adaptability to extreme environments.

Method used

Using high-purity bio-based 1,5-pentanediisocyanate monomers, combined with antioxidants and UV stabilizers, and through synergistic stabilization system compounding and nitrogen replacement post-treatment, the preparation process is simple, highly compatible, and adaptable to complex environments.

Benefits of technology

It significantly improves the product's resistance to yellowing, with no obvious yellowing after 6 months of storage at room temperature, NCO content retention rate ≥96%, and it can withstand environments of -10~30 ℃ without crystallization, reducing transportation costs and adapting to complex application environments.

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Abstract

The invention relates to a preparation method of a bio-based 1, 5-pentamethylene diisocyanate product with yellowing resistance and high stability. A synergistic composite stable system composed of an efficient main antioxidant, an auxiliary antioxidant and a plurality of ultraviolet absorbents / light stabilizers in a scientific proportion is constructed. Wherein the main antioxidant is mainly used for capturing free radicals and blocking an oxidation chain reaction; the auxiliary antioxidant decomposes hydroperoxide to inhibit the hydroperoxide from further initiating the degradation of the material; the ultraviolet stabilizer effectively delays the color change process caused by illumination by absorbing or quenching excited state energy. The preparation method disclosed by the invention has the advantages of high process compatibility, easiness in acquisition of auxiliaries, simple compounding and post-treatment steps and convenience in large-scale popularization; the environmental protection property is outstanding, the yellowing resistance and the storage stability of the product are greatly improved, the normal-temperature closed storage period is prolonged to 6 months or above, the NCO content retention rate is greater than or equal to 96%, and the storage and transportation cost is reduced; the influence of thermal oxidation and photodegradation is resisted, and a complex application environment is adapted.
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