Peroxide-curable fluoroelastomer composition

A technology of organic peroxides and elastomers, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, which can solve the problem of increased viscosity of the composition, poor compression set rate, and kneadability. Problems such as poor liquidity

Active Publication Date: 2007-06-27
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the polyol vulcanization system, due to the low viscosity, the compression set rate deteriorates, especially when the secondary vulcanization process is omitted, there is a problem that the performance deteriorates to the extent that it is not suitable for practical use.
[0007] There are also proposals to improve processability by co-coagulating three types of fluoroelastomers with different Mooney viscosities to obtain fluoroelastomers, and to use peroxide-curable compositions containing the resulting fluoroelastomers (For example, refer to Japanese Patent Laid-Open No. 2000-34381), but it is not enough
[0008] Furthermore, fillers such as carbon black are often used as additives for fluoroelastomers, but as the fillers are filled, the viscosity of the composition increases, resulting in poor kneading and fluidity during molding. The problem
In particular, in order to provide functions such as electrical conductivity and exothermic properties, a large amount of fillers must be compounded. However, when using conventional technologies, it is very difficult to process due to increased viscosity, scorching, and poor kneading. can not be processed on
Reasons for this include that the viscosity of conventional fluororubbers is too high, and when a large amount of filler is added, the viscosity rises significantly; or due to insufficient adhesion, lack of affinity with fillers, and difficulty in kneading, etc.

Method used

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Examples

Experimental program
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preparation example Construction

[0128] The preparation method and vulcanization method of the composition of the present invention are not particularly limited. For example, compression molding, extrusion molding, transfer molding, etc. can be applied. One piece. In molding, it is preferable in that the compression set rate and the like can be satisfied even if the secondary vulcanization is omitted.

[0129] The composition containing the fluorine-containing elastomer (A) and the vulcanizing agent (B) of the present invention is suitable for use as a material formed by dispersion molding on a substrate containing an inorganic material such as a coating agent, metal, or ceramics. Substrate-integrated gaskets; multilayer products formed by coating substrates containing inorganic materials such as fillers, metals, and ceramics, gaskets for magnetic recording devices, sealing materials for fuel cells, and sealing materials for cleaning equipment. It is especially suitable for gaskets for vehicles, such as inta...

Embodiment

[0132] Examples are given below to describe the present invention, but the present invention is not limited to these Examples.

[0133]

[0134] Device: HLC-8000 (manufactured by Tosoh Co., Ltd.)

[0135] Showa column: GPC KF-806M 2pcs

[0136] GPC KF-8011 roots

[0137] GPC KF-8021 roots

[0138] Detector: Differential Refractive Index Detector

[0139] Developing solvent: tetrahydrofuran

[0140] Temperature: 35°C

[0141] Sample concentration: 0.1% by weight

[0142] Standard sample: various monodisperse polystyrene ((Mw / Mn) = 1.14 (Max), TSK standard POLYSTYRENE (manufactured by Tosoh Co., Ltd.)

[0143]

[0144] Measurement is performed in accordance with ASTM-D1646 and JIS K6300.

[0145] Measuring instrument: Model MV2000E manufactured by ALPHA TECHNOLOGIES

[0146] Rotor rotation speed: 2rpm

[0147] Measuring temperature: (Mooney viscosity) 100°C or 121°C

[0148] (Mooney Scorch) 145°C

[0149]

[0150] Under the following standard vulcanization conditi...

reference example 1

[0212] (polymerization of seed polymer particles)

[0213] In a polymerization tank having an electromagnetic induction stirring device as a stirring device with an internal volume of 1.8 liters, add 720 g of pure water, 290 g of a 10% by weight ammonium perfluorooctanoate aqueous solution and 0.6 g of diethyl malonate, and fully replace the system with nitrogen. To decompress. This operation was repeated 3 times, 20 g of VdF and 51 g of HFP were added under reduced pressure, and the temperature was raised to 80° C. under stirring. Then, 0.02 g of ammonium persulfate (APS) dissolved in 0.6 g of pure water was injected with nitrogen gas to initiate polymerization. The polymerization pressure was set at 2 MPa, and VdF / HFP mixed monomer (78 / 22 (mol %)) was continuously supplied to make up for the pressure drop during polymerization, and the polymerization was carried out under stirring. 215 g of monomers were supplied into the tank until the polymerization was completed.

[02...

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Abstract

The invention provides a peroxide-curable fluoro- elastomer composition which is remarkably improved in the fluidity and thereby exhibits improved processabilty, though conventional fluoroelastomer compositions could be molded only by a molding process problematic in productivity, i.e., compression molding or transfer molding which was widely used in the prior art. Further, the invention provides molded articles obtained by curing the composition as well as a fluoroelastomer composition permitting high filler loading. Specifically, a fluoroelastomer composition which comprises (A) a fluoroelastomer composed of structural units derived from vinylidene fluoride and / or tetrafluoroethylene and structural units derived from at least one other monomer and having (a) a number-average molecular weight (Mn) of 30,000 to 70,000g / mol and (b) an iodine content of 0.3 to 1.0 wt% and (B) a curing agent consisting of an organic peroxide.

Description

technical field [0001] The present invention relates to a fluoroelastomer composition capable of peroxide vulcanization, having excellent flowability and improved processability, and a molded article obtained by vulcanizing the composition. Background technique [0002] Vinylidene fluoride-hexafluoropropylene (VdF-HFP) or tetrafluoroethylene (TFE)-perfluoro(alkyl vinyl ether) fluoroelastomers, because they exhibit excellent chemical resistance, solvent resistance Performance, heat resistance, as circular rings, gaskets, hoses, valve stem seals, shaft seals, diaphragms, etc. used in harsh environments, are widely used in the automotive industry, semiconductor industry, chemical industry and other fields. [0003] As a fluoroelastomer used in these applications, there is an iodine-containing fluoroelastomer having a highly reactive iodine atom at a molecular terminal. This iodine-containing fluoroelastomer can have excellent vulcanization efficiency due to the iodine atom at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/12C08K5/14
CPCC08F214/26C08F214/22C08K5/14B82Y30/00C08L27/12
Inventor 入江正树西村洋介藤泽学岸根充太田大助
Owner DAIKIN IND LTD
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