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A liquid fluororubber composition based on coordination crosslinking, its preparation method and application

A liquid fluororubber, coordination cross-linking technology, applied in the field of fluorine materials, can solve the problems of slow reaction rate, long time, long curing time, etc., and achieve the effect of easy operation, simple reaction process and short curing time

Active Publication Date: 2021-03-02
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the existing method, for the curing of the carboxyl-terminated liquid fluororubber, when epoxy curing is used to cure the carboxyl-terminated liquid fluororubber, the epoxy group is mainly used to react with the carboxyl group of the carboxyl-terminated liquid fluororubber, but between the two functional groups The reaction rate is slow, so the curing time is long; when carboxyl-terminated liquid fluororubber is cured with carbodiimide substances, the reaction rate of the carboxyl group and N=C=N is cured, and the reaction rate is slow and it takes a long time

Method used

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  • A liquid fluororubber composition based on coordination crosslinking, its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0057] A method for preparing a liquid fluororubber composition based on coordination crosslinking, comprising the steps of:

[0058] In a 100ml round bottom flask, add 10ml acetone, add 10g carboxyl-terminated liquid fluororubber (vinylidene fluoride-hexafluoropropylene copolymer, carboxyl content is 2.98wt%, number average molecular weight is 3689) under mechanical stirring, stir at room temperature for 30min , until the carboxyl-terminated liquid fluororubber is completely dissolved;

[0059] Dissolve 0.73g of anhydrous zinc acetate in 7.3g of methanol / water (v:v=1:1) solution to prepare methanol / water solution of anhydrous zinc acetate; then add it to carboxyl-terminated liquid fluororubber and stir at room temperature After 1h, dry at 60°C to remove the solvent to obtain intermediate product A;

[0060] Add intermediate product A to 30ml DMF, stir at room temperature until it is completely dissolved, add 0.76g poly(4-vinylpyridine-co-styrene) (PSVP), stir at room tempera...

Embodiment 2-5

[0064] The preparation methods of the liquid fluororubber compositions based on coordination crosslinking provided by Examples 2-5 are the same as those in Example 1, the only difference being that the amount of poly(4-vinylpyridine-co-styrene) is different, see for details Table 1.

[0065] Wherein, the molar ratio of the carboxyl group of the carboxyl-terminated liquid fluororubber in Example 2, the metal ion in the metal salt, and the pyridine group in the pyridyl-containing polymer is 1:0.6:1.5;

Embodiment 3

[0066] In Example 3, the carboxyl group of the carboxyl-terminated liquid fluororubber, the metal ion in the metal salt, and the pyridine group in the pyridyl-containing polymer have a molar ratio of 1:0.6:2;

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Abstract

The embodiments of the present invention relate to the field of fluorine materials, and relate to a liquid fluororubber composition based on coordination crosslinking, its preparation method and application. The preparation method of the liquid fluororubber composition based on coordination crosslinking in the embodiment of the present invention includes: reacting the carboxyl-terminated liquid fluororubber with a metal salt; adding a pyridyl-containing polymer to the obtained reactant, and reacting at room temperature; The metal salts are transition metal salts. After the carboxyl-terminated liquid fluororubber reacts with a metal salt, it forms a transition metal coordination with the pyridyl group in the pyridyl polymer, and a cross-linking reaction can occur at room temperature to achieve the purpose of curing. The curing time is short and the curing time is short. The effect is good.

Description

technical field [0001] The invention belongs to the field of fluorine materials, and relates to a liquid fluororubber composition based on coordination crosslinking, a preparation method and application thereof. Background technique [0002] Fluorine rubber is a kind of polymer containing fluorine atoms on the carbon atoms of the main chain or side chain. It has excellent properties such as high temperature resistance, aging resistance, and organic solvent resistance. It is widely used in automobiles, aerospace, petrochemicals, and semiconductors. and other fields, has an irreplaceable role. [0003] At present, a low molecular weight liquid fluororubber with reactive groups has been developed, which has good processability and can be used to prepare fluorine-containing adhesives and sealants. However, the curing method of the existing low-molecular-weight liquid fluororubbers with reactive groups needs to be carried out under heating conditions, or although it is carried o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08L27/16C08L39/08
CPCC08J3/24C08J2327/16C08J2439/08
Inventor 张孝阿杨莹刘力吕亚非江盛玲王成忠
Owner BEIJING UNIV OF CHEM TECH
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