Small-scale synthesis and curing method of a carboxyl-terminated liquid fluoroelastomer

A technology of fluoroelastomer and synthesis method, applied in the field of small-scale synthesis and curing of carboxyl-terminated liquid fluoroelastomer, can solve the problem of high curing temperature and achieve the effect of high reaction efficiency
CN105968247BActive Publication Date: 2018-06-29BEIJING UNIV OF CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING UNIV OF CHEM TECH
Publication Date
2018-06-29

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Abstract

The invention discloses a laboratory-scale synthesizing and curing method of a terminal carboxyl liquid fluorine elastomer. The method comprises the following steps: dissolving a fluorine elastomer in an organic solvent; carrying out oxidative degradation reaction in the presence of oxidant and alkali, in which the reaction time lasts for 8-24 hours, and the reaction temperature changes in a range of 10-40 DEG C; and controlling the dripping speed of the oxidant and the alkali via a peristaltic pump to obtain the terminal carboxyl liquid fluorine elastomer. The synthesizing method has the characteristics of few by-products, simplicity and controllability, and high yield. The terminal carboxyl liquid fluorine elastomer can be cured by reacting with carbodiimide-containing compounds under the normal temperature; the cured product has the characteristics of high mechanical performance, high resistance to high temperature and low temperature and high resistance to chemical media; the terminal carboxyl liquid fluorine elastomer can be used for preparing sealants and adhesives with resistance to chemical media and can also be used for preparing terminal-sealed liquid fluorine elastomers such as hydroxyl, silane, epoxy and amino and the like through terminal group transformation reaction.
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Description

technical field

[0001] The invention relates to a small-scale synthesis and curing method of a carboxyl-terminated liquid fluoroelastomer. Background technique

[0002] Liquid fluoroelastomer is a new branch of the fluoroelastomer family. Its molecular weight is lower than that of traditional fluoroelastomers, but it inherits the excellent heat resistance, oxidation resistance and chemical resistance of fluoroelastomers. Moreover, the application range of the fluoroelastomer is broadened. Carboxyl-terminated liquid fluoroelastomers can be cured into any desired shape at a relatively low temperature, and can be widely used in building exterior coatings and oil tank sealants, etc., and are especially suitable for bonding, surface protection and porosity under harsh conditions It is an ideal sealing material, adhesive and coating for the aviation industry.

[0003] At present, carboxyl-terminated liquid fluoroelastomers are mainly prepared by adding a suitable molecular weigh...

Claims

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