Use of acid hydrolysate of oleander ethanol extract in preparation of marine slow-release antifouling agent

By acid hydrolysis of oleander ethanol extract, a marine slow-release antifouling agent was prepared, which solved the problems of heavy metal toxicity and excessively rapid release rate, and achieved a highly efficient and environmentally friendly marine antifouling effect.

CN116762824BActive Publication Date: 2025-11-07XIAMEN UNIV
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Patent Information

Application Number
CN202310716006.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-16
Publication Date
2025-11-07
Estimated Expiration
2043-06-16

AI Technical Summary

Technical Problem

Existing marine antifouling coatings contain heavy metal antifouling agents that are highly toxic, prone to accumulation, and difficult to degrade. Natural antifouling substances, on the other hand, exhibit explosive release phenomena with excessively rapid release rates, resulting in short antifouling durations and making them difficult to apply in practice.

Method used

A slow-release marine antifouling agent was prepared by acid hydrolysis of oleander ethanol extract. The marine antifouling coating was prepared by extracting the oleander ethanol extract with an acid solution after heating to remove sugar groups and reduce water solubility.

Benefits of technology

It significantly inhibits the attachment of large marine fouling organisms, with a release rate much lower than that of unhydrolyzed oleander ethanol extract. It possesses highly efficient antifouling activity, is easy to prepare on a large scale, prolongs the antifouling effect, and reduces costs.

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Abstract

The application discloses application of an acid hydrolysate of an oleander ethanol extract in preparation of a marine slow-release antifouling agent. The acid hydrolysate is prepared by taking tender stems and tender leaves of the oleander as raw materials, extracting the raw materials by using an ethanol solution, and then performing acid hydrolysis. The acid hydrolysate has a significant inhibiting effect on attachment of marine macrofouling organisms, and shows high antifouling activity. The release rate of the acid hydrolysate in antifouling paint is much smaller than that of the oleander ethanol extract before hydrolysis, so that the acid hydrolysate can be used to prepare the marine slow-release antifouling agent.
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