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Process for making a fluoropolymer having nitrile end groups

一种氟聚合物、端基的技术，应用在制备具有腈端基的氟聚合物领域，能够解决不易处理、有毒性、制造过程不便等问题

Inactive Publication Date: 2008-02-27
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it requires an extra step to provide additional energy
Therefore, this method increases the manufacturing cost and causes inconvenience to the manufacturing process
[0004] EP 868447 discloses that using some chain transfer agents (I-(CF 2 ) n -CN) to introduce nitrile end groups; however, the compounds used are costly, toxic, and difficult to handle

Method used

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  • Process for making a fluoropolymer having nitrile end groups

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Under anaerobic conditions, 2800ml of deionized water was put into a 4-liter kettle. Add 9 grams of C 7 F 15 COONH 4 (APFO) and 6 grams of KSCN. After heating to 70°C, 96 g of tetrafluoroethylene (TFE) and 247 g of perfluoromethyl vinyl ether (PMVE) were added. The reaction was initiated by adding 15 grams of ammonium persulfate (APS) dissolved in 110 ml of deionized water. At a pressure of 12 bar and a temperature of 70°C, 23 grams of TFE and 14 grams of PMVE were fed in 363 minutes. The formed latex has a solid content of 4.3% and uses MgCl 2 The solution coagulates. The polymer was dried at 130°C.

[0078] FT-IR analysis showed a significant amount of nitrile functional groups (at 2262 cm -1 peak). According to the above method, the value obtained is 0.039.

Embodiment 2

[0080] Put 2900 ml of deionized water into a 4 liter reactor. Add 9 grams of C 7 F 15 COONH 4 (APFO) and 6 grams of KSCN. After heating to 70°C, 94 g of TFE and 243 g of perfluoromethyl vinyl ether (PMVE) were added. The reaction was initiated by adding 6 grams of ammonium persulfate (APS) dissolved in 50 ml of deionized water.

[0081] At a pressure of 16 bar and a temperature of 70°C, 490 grams of TFE and 418 grams of PMVE were fed in 404 minutes. The formed latex has a solid content of 21.6% and uses MgCl 2 The solution coagulates. The polymer was dried at 130°C.

[0082] The FT-IR analysis of the nitrile end group value of the isolated polymer showed a significant amount of nitrile functional groups (at 2262 cm -1 peak). According to the above method, the value obtained is 0.008.

[0083] The Mooney (1+10@121℃) viscosity is 99.

Embodiment 3

[0085] Put 2700 ml of deionized water into a 4 liter reactor. Add 9 grams of APFO and 5 grams of KOCN. After heating to 70°C, 97 g of TFE and 253 g of PMVE were added. The reaction was initiated by adding 6 grams of APS dissolved in 50 ml of deionized water. At a pressure of 12 bar and a temperature of 70°C, 51 grams of TFE and 43 grams of PMVE were fed within 73 minutes. The formed latex had a solid content of 5.1%. The polymer was dried at 130°C.

[0086] FT-IR analysis showed that the nitrile end group value was 0.067.

[0087] The Mooney (1+10@121°C) viscosity is 39.2.

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Abstract

The present invention discloses a process for making a fluoropolymer having nitrile endgroups. The process comprises a free radical polymerization of one or more fluorinated monomers in the presence of a nitrile group containing salt or a nitrile group containing pseudohalogen compound.

Description

Invention field [0001] The present invention relates to a method for preparing fluoropolymers with nitrile end groups. Background of the invention [0002] Fluoropolymers, that is, polymers with fluorinated backbones, are used in various applications due to their multiple desirable properties, such as heat resistance, chemical resistance, weather resistance, and UV-stability. Various examples are described in "Modern Fluoropolymers" edited by John Scheirs, Wiley Science 1997. [0003] Known fluoropolymers include fluoroelastomers and fluorothermoplastics. Such fluoropolymers are generally gaseous fluorinated olefins such as tetrafluoroethylene (TFE), chlorotrifluoroethylene (CTFE) and / or vinylidene fluoride (VDF) and one or more comonomers such as hexafluoropropylene ( HFP) or perfluorovinyl ether (PVE) or non-fluorinated olefins such as copolymers of ethylene (E) and propylene (P). Examples of fluoroelastomers include copolymers of TFE and PVE and copolymers of VDF and HFP. Fluo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/00C08F8/30C08F14/18C08F2/00C08F16/24C08F214/18
CPCC08F214/18C08F14/18C08F16/24C08F2/22C08F8/30C08F8/00C08F2/00
Inventor W·M·A·格罗托尔特K·亨特泽K·H·洛赫哈斯G·娄尔F·梅尔茨
Owner 3M INNOVATIVE PROPERTIES CO
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