A storage-stable modified carbamate composition and methods of making the same
CN122167686APending Publication Date: 2026-06-09WANHUA CHEM GRP CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WANHUA CHEM GRP CO LTD
- Filing Date
- 2024-12-06
- Publication Date
- 2026-06-09
AI Technical Summary
Technical Problem
Existing thiol modifiers have low reactivity with isocyanates, resulting in high catalyst dosage, high product color, and poor storage stability.
Method used
By reducing the amine base content in thiols, using acidic adsorbent P2O5 treatment and distillation technology, the amine base content in thiols is controlled to be ≤20ppm, and a low amount of catalyst is used to terminate the reaction, thus preparing a modified urea carbamate composition.
Benefits of technology
This significantly improves reactivity, reduces catalyst dosage to less than 0.05%, and yields a modified urea carbamate composition with low color number and excellent storage stability.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure SMS_1
Abstract
The application provides a modified allophanate composition and a preparation method thereof, and belongs to the technical field of polyisocyanate composition preparation. Aliphatic diisocyanate is reacted with mercaptan in the presence of a catalyst, and a prepolymer is obtained after termination of the catalytic reaction; the prepolymer is subjected to thin film evaporation to obtain the modified allophanate composition, and the mass content of amine base in the mercaptan is less than 200 ppm. The method significantly reduces the amount of catalyst used in the catalytic reaction, and a modified allophanate composition with a color number of ≤40 Hazen and stable storage is obtained.
Need to check novelty before this filing date? Find Prior Art