A core-shell structured VPR / NBR nanoparticle latex, its preparation method and application

By preparing core-shell structured VPR/NBR nanoparticle latex, the problem of low hydrogenation degree caused by uneven micelle size distribution in NBR was solved, achieving efficient preparation of hydrogenated nitrile butadiene rubber with stable particle size distribution and high hydrogenation degree.

CN116751343BActive Publication Date: 2026-06-30QINGDAO UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
QINGDAO UNIV OF SCI & TECH
Filing Date
2023-06-21
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In the existing NBR emulsion hydrogenation method for preparing HNBR, the uneven particle size distribution of NBR micelles leads to a low degree of hydrogenation of the NBR latex.

Method used

The VPR/NBR nanoparticle latex with a core-shell structure has a core of butyl pyridine latex and a shell of nitrile pyridine latex. By using surfactants and pre-emulsification technology, the particle size distribution of micelles and the molecular weight of polymers are controlled to form a stable core-shell structure.

Benefits of technology

It achieves good particle size distribution uniformity, high hydrogenation degree, and significantly improved hydrogenation effect in latex, and the preparation process is simple and easy to industrialize.

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Abstract

This invention discloses a core-shell structured VPR / NBR nanoparticle latex, its preparation method, and its application. The invention consists of a core and an outer shell. The core comprises butyl pyridine latex, and the outer shell comprises nitrile butadiene latex, which is a copolymer of butadiene and acrylonitrile. The raw materials include: 100-200 parts deionized water, 50-100 parts butyl pyridine latex, 3-10 parts surfactant, 30-50 parts acrylonitrile, 50-70 parts butadiene, 0.02-0.10 parts initiator, and 0.2-1.0 parts chain transfer agent. This invention also provides a method for preparing the above-mentioned nanoparticle latex and its application in the preparation of hydrogenated butyl pyridine / hydrogenated nitrile butadiene rubber via emulsion hydrogenation. This invention uses seed emulsion butyl pyridine latex as the core and polymerizes it on the surface of the seed emulsion to form the outer shell. This core-shell structured VPR / NBR nanoparticle latex exhibits stable performance, is not prone to demulsification, has a small particle size distribution, good hydrogenation effect, and high degree of hydrogenation.
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