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Fluororubber composition, production method therefor, and molded crosslinked fluororubber article

A manufacturing method and fluororubber technology, applied in mechanical equipment, engine components, engine sealing, etc., can solve the problems of abnormal wear of sliding surfaces, sealing foaming, inability to obtain good sealing, and achieve excellent kneading, resistance to Excellent foaming effect

Active Publication Date: 2020-03-17
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, with the expansion of applications, there are concerns that blisters will occur near the seal and / or abnormal wear of the sliding surface will occur due to use in a particularly high-load environment.
[0003] In terms of the necessary functions of sealing products, it is preferable to incorporate fillers with high reinforcing properties, but there is a problem that sufficient reinforcing properties cannot be obtained even if conventional fillers are incorporated, and good sealing properties (product functions) cannot be obtained.
In the case of using the first elastomer as the fluororubber polymer, if it exceeds 20 parts by mass relative to 100 parts by mass of the fluororubber polymer, there will be the following problems: the roll kneading property is poor, and the surface of the billet becomes dry and rough, which is not normal. rubber surface
However, in Patent Document 2, it is described in Comparative Example 3 using hydrogenated nitrile rubber: when using a multilayer fibrous carbon nanostructure that does not contain single-walled carbon nanotubes as the carbon nanotubes, Unable to achieve "resistance to blistering"

Method used

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  • Fluororubber composition, production method therefor, and molded crosslinked fluororubber article
  • Fluororubber composition, production method therefor, and molded crosslinked fluororubber article
  • Fluororubber composition, production method therefor, and molded crosslinked fluororubber article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] 1st kneading process

[0091] No. 4 was used for the compounding recipe of the above-mentioned carbon nanotube masterbatch. In the first kneading, a carbon nanotube masterbatch containing a fluororubber polymer (20% by weight of CNT in the masterbatch) was produced by roller kneading. As the first kneading facility, an open roll kneading facility having a pair of two rolls was used. The distance between the first roll and the second roll was 1 mm, and the fluororubber polymer and CNT were kneaded to prepare a carbon nanotube masterbatch of formulation No. 4.

[0092] The kneading processability when kneading with an open roll to produce a carbon nanotube masterbatch was evaluated according to the following evaluation criteria, and the results are shown in Table 1 above.

[0093]

[0094] ○: Can be kneaded

[0095] ×: Not kneadable

[0096] 2nd kneading process

[0097] The carbon nanotube masterbatch obtained in the above-mentioned first kneading step was kneaded...

Embodiment 2～6

[0124] In Example 1, the carbon nanotube masterbatch No. 4 or No. 5 was used, and various compounding formulations were used to evaluate the kneading processability, hardness, abrasion resistance, and foaming resistance.

[0125] The results obtained in Examples 1 to 6 are shown in Table 2 below together with the compounding ratio.

[0126] Table 2 (Second Kneading Process)

[0127]

Embodiment 7

[0138] In Example 1, a fluororubber composition was produced in the same manner as in Example 1 except that "2. Second kneading step" was changed as shown below. The obtained fluororubber composition was evaluated for kneading processability, hardness, abrasion resistance, and foaming resistance.

[0139] "The second kneading process

[0140] The carbon nanotube masterbatch obtained in the first kneading step was introduced into a second kneading device which is a kneader kneading device.

[0141] In this second kneading facility, masterbatch No. 4 was kneaded with the fluororubber raw materials of the following recipe to produce a fluororubber composition. "

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Abstract

A fluororubber composition that is a kneaded mixture of: a carbon nanotube masterbatch comprising 100 parts by weight of a fluororubber polymer and 4-20 parts by weight of multilayered carbon nanotubes which are fibrous carbon nanostructures including no single-layered carbon nanotubes; and a raw fluororubber material comprising both a fluororubber polymer and a reinforcing filler. The multilayered carbon nanotubes are contained in an amount of 0.5-6 wt% of the kneaded mixture. For producing the fluororubber composition, the kneading is conducted with rolls or a kneader. The fluororubber composition can give molded crosslinked fluororubber articles which exhibit wear resistance and blistering resistance.

Description

technical field [0001] The present invention relates to a fluororubber composition, a production method thereof, and a fluororubber cross-linked molded product. More specifically, it relates to a fluororubber composition capable of obtaining a fluororubber crosslinked molded article exhibiting wear resistance and blistering resistance, a method for producing the same, and a fluororubber crosslinked molded article. Background technique [0002] Fluorine rubber compositions are excellent in oil resistance and fuel resistance, and are used as sealing materials such as oil seals, O-rings, and packings in a wide range of fields such as automobiles and industrial machines. In recent years, as applications have expanded, there has been concern that blisters will occur near the seal and / or abnormal wear of the sliding surface will occur due to use in a particularly high-load environment. [0003] In terms of the necessary functions of sealing products, it is preferable to mix fille...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/12C08J3/20C08J3/22C08K3/04F16J15/3284
CPCF16J15/3284C08K3/041C08L2310/00C08L27/16C08K9/10C08J3/226C08J3/203C08J3/243C08J2327/16C08J2427/16C08K3/34C08K3/22C08K3/04C08J3/005C08J3/22C08K5/14C08K7/04C08K2201/011C08L27/18C08L27/20
Inventor 村上英幸阿部俊介
Owner NOK CORP
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