Curing compositions for fluoropolymers

A curing agent and polymer technology, applied in the field of fluoropolymer products, can solve the problems of lack of rheological control, unsatisfactory catalyst, opacity and so on

Active Publication Date: 2007-11-28
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such catalysts may leave undesirable and extractable metal residues in the cured product, which are undesirable for environmental reasons
Ammonia-generating compounds have also been used as components of cure systems in fluoroelastomers, but these cure systems lack the desired rheology control during processing
Additionally, most known fluoroelastomers cure to a colored or opaque material

Method used

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  • Curing compositions for fluoropolymers
  • Curing compositions for fluoropolymers
  • Curing compositions for fluoropolymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] Fluoropolymer A (100 g) was compounded on a two-roll mill with the addition of 2 mmol of SPHI in methanol by adding Prepared by neutralizing 2 mmol PHI in 25% sodium methoxide.

[0153] The resulting compound was pressure cured at 190° C. for 15 minutes (min.) at a level of 2 mmhr. After a post-cure step in air (room temperature to 175°C in 45 minutes, hold at 175°C for 16 hours, then ramp to 300°C in 2 hours and hold at 300°C for 6 hours), The compound obviously formed a triazine cross-linking system (by 1556cm -1 evidenced by the FT-IR peak at ). Physical properties were measured using dumbbell specimens cut from the pressure cured and post cured test pieces. Compression set was measured at a deflection of 25%. The O-ring is completely transparent.

Embodiment 2

[0155] Fluoropolymer A was used in the same operating procedure as in Example 1, except that the curing agent salt used was SHI. The same pressure cure and post cure procedure as in Example 1 was used. After post-curing, at 1556cm -1 A strong triazine signal appeared at the Define the "triazine ratio" as: at 1556cm -1 The triazine peak area at 2200-2700cm -1 The ratio of the area under the C-F pan-spectral band between the two is multiplied by 1000. The "triazine ratio" of the sample prepared in this example was 60.4. The sample is optically clear.

Embodiment 3

[0157] The fluoropolymer A was used in the same operating procedure as in Example 1, except that the curing agent salt used was replaced by cesium ions for sodium ions. The cesium salt was prepared as follows. Dissolve Cs in 1 mL methanol 2 CO 3 (1 mmol, 0.33 g) was slurried, followed by the dropwise addition of PHI (2 mmol, 0.49 g). Gas evolution was seen and the flask warmed slightly, indicating that a reaction had occurred. As in Example 1, this slurry was compounded with 100 grams of the fluoroelastomer compound of Example 1 on a two-roll mill. The same pressure cure and post cure procedure as in Example 1 was used. After the post-curing procedure of Example 1, at 1556 cm -1 A strong triazine signal appeared at the The sample was very pale yellow in color but was still optically clear.

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Abstract

A curative composition comprising a cation and an anion of the formula (I): wherein m, n, p, and q are positive integers, wherein m * p = n * q, wherein Q is an organo onium, and A is an anion, provided that at least one A is selected from the formula (II): wherein each R independently is H, halo, alkyl, aryl, aralkyl, or cycloalkyl, and which also may be halogenated, fluorinated, or perfluorinated, wherein two or more of R and R' groups may together form a ring, wherein each R group independently may contain one or more heteroatom(s), wherein R' can be the same as R, with the proviso that R' cannot be halo. Also provided are a fluoropolymer composition including this curative, a method of making a fluoropolymer, and fluoropolymer articles containing curable or cured fluoropolymer compositions.

Description

technical field [0001] The present invention relates to curing agents, curable and cured fluoropolymer compositions, methods of making fluoropolymer compositions, and fluoropolymer articles. The fluoropolymer article can be transparent, even completely transparent. Background technique [0002] Fluoroelastomers are cured or crosslinked and are generally resistant to high temperatures and harsh chemical environments. They are especially useful as seals, gaskets and moldings in systems exposed to high temperatures and / or in contact with corrosive substances. For sealing applications that need to withstand the most extreme conditions, perfluorinated elastomers are used. Such components are used in applications such as the automotive, chemical processing, semiconductor, aerospace and petroleum industries. [0003] Fluoroelastomers typically contain a cure site component to promote cure in the presence of a curing agent or catalyst. One class of useful cure site components fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/00C08K5/50C08K5/19
CPCC08K5/19Y10T428/215C08K5/50C08L27/12C08F14/18
Inventor 沃尔那·M·A·格鲁塔特艾里克·W·阿代尔米格尔·A·格拉
Owner 3M INNOVATIVE PROPERTIES CO
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