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Peroxide cross-linked fluorine-containing elastomer composition

A peroxide and elastomer technology, which is applied in the field of peroxide crosslinked fluoroelastomer compositions, can solve the problems of deterioration of compression set resistance, increase of CSM dosage, deterioration of elongation, etc., and achieve the goal of reducing viscosity Effect

Active Publication Date: 2011-02-23
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As a method of reducing the viscosity of branched fluoroelastomers, it is conceivable to increase the amount of CSM to increase the number of branches, but if this method is adopted, the resistance to compression set is improved, but the elongation is deteriorated
Moreover, the usage of expensive CSM increases, and the cost also increases accordingly
In addition, it is also considered to increase the chain transfer agent represented by RIx(DI) to reduce the molecular weight, but the number of branched chains in one molecule is reduced, so the resistance to compression set is deteriorated

Method used

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  • Peroxide cross-linked fluorine-containing elastomer composition
  • Peroxide cross-linked fluorine-containing elastomer composition
  • Peroxide cross-linked fluorine-containing elastomer composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0267] Next, examples are given to illustrate the present invention, but the present invention is not limited to the examples.

[0268]

[0269] Device: HLC-8020 (manufactured by Tosoh Corporation)

[0270] Column: GPC KF-806M 2pcs

[0271] GPC KF-801 1 piece

[0272] GPC KF-802 1 piece

[0273] Detector: Differential Refractometer

[0274] Developing solvent: tetrahydrofuran

[0275] Temperature: 35°C

[0276] Sample concentration: 0.1% by weight

[0277] Standard samples: various monodisperse polystyrenes ((Mw / Mn)=1.14(Max)), TSKstandard POLYSTYRENE (manufactured by Tosoh Corporation)

[0278]

[0279] The Mooney viscosity is measured in accordance with ASTM-D1646 and JIS K6300-1.

[0280] Measuring machine: Automatic Mooney viscometer manufactured by Uejima Seisakusho Co., Ltd.

[0281] Rotor speed: 2rpm

[0282] Measurement temperature: 100°C (60°C for some)

[0283]

[0284] Device: GPCmax-TDA302 system (Viscotech)

[0285] Detectors: RI (Differential Ref...

reference example 1

[0322] Reference example 1 (production of branched fluoroelastomer (A-1))

[0323] In a polymerization tank having an electromagnetic induction stirring device as a stirring device with an internal volume of 3 liters, add pure water 1730g, C 5 f 11 CHOONH 4 1.73g, 2,3,3,3-tetrafluoro-2-[1,1,2,3,3,3-hexafluoro-2-(1,1,2-trifluoroallyloxy)propoxy Base] Propionic acid ammonium salt 0.173g, after fully replacing the inside of the system with nitrogen gas, the pressure was reduced. This operation was repeated 5 times, 35 g of VdF, 42 g of TFE, and 1090 g of HFP were added under reduced pressure, and the temperature was raised to 80° C. while stirring. Next, inject 0.24 g of APS dissolved in 10 g of pure water with nitrogen pressure to initiate polymerization, and continue polymerization under the conditions of (a), (b), (c), (d), and (e) for 4 hours Finally, the stirring was stopped, the monomer was released, and the polymerization was stopped.

[0324] (a) Using Aspen Plus Ver...

reference example 2

[0331] Reference Example 2 (Manufacture of branched fluoroelastomer (A-2))

[0332] Within the conditions of (d) among the conditions described in Reference Example 1, 1.45 g of octafluoro-1,4-diiodobutane (0.26 parts by mass relative to 100 parts by mass of the fluoroelastomer), IM single Body (CF 2 = CFOCF 2 CF 2 CH 2 1) 5.1 g (0.85 parts by mass relative to 100 parts by mass of the fluoroelastomer as the target product), except that, in the same manner as in Reference Example 1, a branched-chain fluoroelastomer (A- 2).

[0333] The weight of the obtained emulsion was 2182 g, and the polymer concentration was 27.6% by mass. In addition, the amount of the fluoroelastomer was 602 g, the weight average molecular weight Mw measured by GPC was 179,000, the number average molecular weight Mn was 101,000, and Mw / Mn was 1.76. Also, take advantage of 19 The composition of the polymer measured by F-NMR was VdF / TFE / HFP=51 / 20 / 29 (mol%). The Mooney viscosity at 100°C is 105.

[...

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Abstract

Disclosed is a fluorine-containing elastomer composition that maintains the normal-state properties of a branched fluorine-containing elastomer while reducing viscosity, without increasing the usage of an expensive monomer. A peroxide cross-linked fluorine-containing elastomer composition includes: (A) a branched fluorine-containing elastomer that has a cross-linking site that is peroxide cross-linkable, has a number average molecular weight between 1,000 and 300,000, and has a Mark-Houwink gradient (a) of less than 0.6 when the absolute molecular weight and intrinsic viscosity is plotted on a Mark-Houwink plot, with the x-axis being absolute molecular weight and the y-axis being intrinsic viscosity; and (B) a straight-chain type fluorine-containing polymer that has a number average molecular weight between 1,000 and 250,000, with a Mark-Houwink gradient (a) that is no less than 0.6.

Description

technical field [0001] The present invention relates to a peroxide-crosslinked fluoroelastomer composition with improved processability. Background technique [0002] Fluorine-containing elastomers such as vinylidene fluoride-hexafluoropropylene and tetrafluoroethylene-perfluorovinyl ether exhibit excellent chemical resistance, solvent resistance, and heat resistance, so they are used in harsh environments. O-rings, gaskets, hoses, stainless steel seals, shaft seals, partitions, etc. are widely used in the automotive industry, semiconductor industry, chemical industry and other fields. [0003] Fluorine-containing elastomers used in these applications include those having crosslinking sites such as highly reactive iodine atoms at molecular terminals. With regard to the fluoroelastomer having a crosslinking site at the molecular end, high crosslinking efficiency can be realized through the crosslinking site at the molecular end, and the crosslinking property is excellent. I...

Claims

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Application Information

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IPC IPC(8): C08K5/14C08F214/18C08F259/08C08L27/12
CPCC08F259/08C08L27/16C08K5/14C08L51/003C08L2205/02
Inventor 藤泽学福冈昌二岸根充
Owner DAIKIN IND LTD