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High-performance copolymerized liquid fluororubber as well as preparation method and application thereof

A liquid fluorine rubber and fluorine rubber technology, applied in the field of fluorine materials, can solve the problems of limited product performance improvement and poor compatibility, and achieve the effect of reducing the amount of addition, improving flexibility and large molecular weight

Active Publication Date: 2020-07-31
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when these two fluororubbers are blended and cured, the compatibility of the two is poor, and the performance of the resulting product is limited.

Method used

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  • High-performance copolymerized liquid fluororubber as well as preparation method and application thereof
  • High-performance copolymerized liquid fluororubber as well as preparation method and application thereof
  • High-performance copolymerized liquid fluororubber as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of carboxyl-terminated liquid fluororubber (vinylidene fluoride-hexafluoropropylene copolymer, number average molecular weight 2500):

[0022] 100g raw rubber fritters are dropped into the reaction bottle (2000ml) that has added 600ml acetone and 400ml sherwood oil, stir to make it all dissolve.

[0023] Place the reaction flask dissolved with fluororubber in an ice-water bath, add 8g of phase transfer catalyst BTEAC, stir evenly, then slowly add 30wt% H 2 o 2 solution (90g), and at the same time, 50wt% KOH aqueous solution (80g) was added dropwise, and the solution was dropped within 2h, and then reacted for 3h under constant stirring.

[0024] Add BETAC (5g) and 30wt% H 2 o 2 Solution (50g), continue to react for 3h, stop the reaction.

[0025] After the reaction solution was left to stand for 3 hours, the supernatant was added to a glass beaker, hydrochloric acid was added to adjust the pH to 2, and then 2000 ml of deionized water was added, and stirr...

Embodiment 2

[0031] Preparation of carboxyl-terminated liquid fluororubber (vinylidene fluoride-hexafluoropropylene copolymer, number average molecular weight 850):

[0032] 100g raw rubber fritters are dropped into the reaction bottle (2000ml) that has added 600ml acetone and 400ml sherwood oil, stir to make it all dissolve.

[0033] Place the reaction flask dissolved with fluororubber in an ice-water bath, add 8g of phase transfer catalyst BTEAC, stir evenly, then slowly add 30wt% H 2 o 2 solution (90g), and at the same time, 50wt% KOH aqueous solution (80g) was added dropwise, and the solution was dropped within 2h, and then reacted for 22h under constant stirring.

[0034] Add BETAC (5g) and 30wt% H 2 o 2 Solution (50g), continue to react for 12h, stop the reaction.

[0035] After the reaction solution was allowed to stand for 12 hours, the supernatant was added to a glass beaker, hydrochloric acid was added to adjust the pH to 2, and then 2000 ml of deionized water was added, and ...

Embodiment 3

[0041] Preparation of hydroxyl-terminated liquid fluororubber (vinylidene fluoride and perfluoromethyl vinyl ether copolymer, number average molecular weight 2740):

[0042] 100g fluoroether rubber raw rubber small pieces are dropped into the reaction bottle (2000ml) that has added 600ml acetone and 400ml sherwood oil, stir to make it all dissolve.

[0043] Place the reaction bottle dissolved with fluoroether rubber in an ice-water bath, add 8g of phase transfer catalyst BTEAC, stir evenly, and then slowly add 30wt% H 2 o 2 Solution (90g), at the same time, 50wt% KOH aqueous solution (80g) was added dropwise and dropped within 2h, and then reacted for 8h under constant stirring.

[0044] Add BETAC (5g) and 30wt% H 2 o 2 Solution (50g), continue to react for 5h, stop the reaction.

[0045] After the reaction solution was allowed to stand for 12 hours, the supernatant was added to a glass beaker, hydrochloric acid was added to adjust the pH to 2, and then 2000 ml of deionize...

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Abstract

The invention discloses high-performance copolymerized liquid fluororubber as well as a preparation method and application thereof. The liquid fluororubber is a BAB type copolymer formed by copolymerization of carboxyl-terminated fluororubber (A) and hydroxyl-terminated fluororubber (B), wherein the molar ratio of the carboxyl-terminated fluororubber (A) to the hydroxyl-terminated fluororubber (B)is 1: 2, the molecular weight of the carboxyl-terminated fluororubber is 800-9000, the molecular weight of the hydroxyl-terminated fluororubber is 800-9000, and the molecular weight of the copolymerized liquid fluororubber is 1600-18000. The beneficial effects are that the performance advantages of different fluororubbers can be combined, the problems of poor compatibility and poor blending and curing effects of different rubbers are avoided, and the prepared hydroxyl-terminated fluororubber has multiple excellent performances such as high temperature resistance, low temperature resistance and medium resistance.

Description

technical field [0001] The invention relates to the technical field of fluorine materials, in particular to a high-performance copolymerized liquid fluorine rubber, a preparation method and an application. 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 aerospace, automotive, petrochemical, Semiconductors and other fields have an irreplaceable role. [0003] There are many types of fluororubber, and liquid fluororubber with reactive groups has also been developed. However, although traditional fluororubber has many advantages, it has poor low temperature resistance. Under dynamic conditions, it loses its elasticity when it is below minus 30 °C. Therefore, the application in cutting-edge fields such as national defense and military industry is o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08G18/62
CPCC08G81/021C08G18/6279
Inventor 刘慧慧李尚斌罗观崔玉涛朱肖楠邓超白永平
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS