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EPDM composition

A technology of composition and polymer, which is applied in the field of EPDM composition, can solve problems such as inability to play, adverse effects on products, rust, etc., and achieve the effect of improving performance

Inactive Publication Date: 2009-05-06
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the low degassing property is poor, the following problems will be caused: the metal parts inside the electronic equipment, etc. will be oxidized, or rusted, or corroded, or the components will be deteriorated, which will adversely affect the product, and the electronic parts, etc. will be damaged. reduced reliability
In addition, if the low gas permeability (low water vapor permeability) is poor, there is a danger that, for example, in a hard disk drive, etc., a fault such as a wiring short circuit will be induced by the intrusion of moisture, making it unable to function. , due to the intrusion of siloxane gas (silicone gas) and the like, a contamination layer is formed on the surface of the disk, resulting in failures that cannot be read

Method used

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  • EPDM composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] EPDM polymer (Mitsui Chemicals "EPT3095") 100 parts by weight

[0049] Carbon black ("Thermal MT-CB" manufactured by Huber Corporation) 200 parts by weight

[0050] Paraffin oil (Idemitsu Kosan "Process Oil PW380") 120 parts by weight

[0051] Zinc oxide (manufactured by Sanbaosha) 3 parts by weight

[0052] Anti-aging agent ("NOCRAC MB" manufactured by Ouchi Shining Co., Ltd.) 1 part by weight

[0053] TAIC (manufactured by Nippon Chemicals Co., Ltd.) 1 part by weight

[0054] 3 parts by weight of dicumyl peroxide

[0055] Knead the above components with a kneader made by MORIYAMA Co., Ltd. to obtain an unvulcanized billet, then cross-link it with a compression molding machine at a temperature of 180°C and a compression time of 6 minutes, and apply it in a heating furnace at 150°C 5 hours of heat treatment to mold the cross-linked rubber.

[0056]

[0057] (1) Hardness

[0058] Three test pieces with a thickness of 2 mm were stacked and me...

Embodiment 2

[0078] Embodiment 2, comparative example 1-5

[0079] In Example 1, the crosslinked rubber was produced in the same manner as shown in Table 1 except that the compounding amount was changed to that shown in Table 1, and the results of the same evaluation are shown in Table 1.

[0080] Table 1

[0081] (parts by weight)

[0082]

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PUM

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Abstract

The invention provides an EPDM composition, being characterized in that the composition takes ethane / propylene / non-conjugated diene terpolymer (EPDM) as the main components. The composition contains plasticizer at 50-200 part by weight per the EPDM polymer of 100 parts by weight, filler at 100-450 part by weight per the EPDM polymer of 100 parts by weight and vulcanizing agent at 1-10 part by weight per the EPDM polymer of 100 parts by weight. Even a the large amount of plasticizers are cooperated, the molding material excellent in low outstanding property and low gas permeability (low water vapor permeability) can be obtained even if the EPDM composition contains a mass of plasticizer blended in.

Description

technical field [0001] The present invention relates to an EPDM composition. Specifically, it relates to an EPDM composition suitable for use as a molding material for gaskets attached to electronic devices (such as precision devices such as HDDs) that prevent the intrusion of moisture and dust and require low outgassing properties. . Background technique [0002] Conventionally, a technique of using an EPDM composition as a molding material such as a gasket mounted on an electronic device such as a precision device such as a HDD is known. The amount of gas released by organic materials is small) and low gas permeability (low water vapor permeability), it is considered that it can be a material that is worth looking forward to as a gasket for hard disk drives. It is proposed that in EPDM polymers, no EPDM composition suitable for use as a plasticizer for process oils, etc., as a molding material for gaskets for hard disk drives, etc. If the low degassing property is poor, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08K5/00C08K3/00F16J15/10
CPCC08K5/14C08K5/0016C08L23/16C08K5/0025C08L91/00F16J15/102C08K3/04C08L2312/00C08L2666/04C08L23/083
Inventor 横田敦小岛好文
Owner NOK CORP