Sealing member for piping material having excellent chlorine resistance, method for producing sealing member for piping material having excellent chlorine resistance, sealing member for piping material having excellent oil resistance, and piping mate
A manufacturing method and technology of sealing parts, which are applied in the sealing of engines, nanotechnology for material and surface science, sealing devices, etc., can solve problems such as cracks, and achieve the effect of excellent mechanical strength
Inactive Publication Date: 2011-06-08
HITACHI ASTEMO LTD +1
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Problems solved by technology
Although the existing seals for pipeline materials are excellent in various mechanical strengths, the free residual chlorine in the fluid will oxidize and chlorinate the rubber surface of the seals. After forming a cross-linked layer and an embrittlement layer, due to Under the influence of water flow vibration, etc., this layer is cracked, and black components, etc. are peeled off and sometimes float in the piping system. Therefore, it has been desired to improve chlorine resistance in the past.
Method used
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Embodiment
[0120] Next, examples of the present invention will be described, but the present invention is not limited thereto.
[0121] First, chlorine resistance was evaluated using the sealing material samples for piping materials of Examples 1-4 and Comparative Examples 1-5.
[0122] (1) Surface oxidation treatment of carbon nanofibers
[0123] (1-1) A nozzle was attached to the top of a vertical heating furnace (inner diameter 17.0 cm, length 150 cm). The temperature of the furnace inner wall of the heating furnace is raised to 1000° C. and maintained at this temperature, and the hydrogen gas with a flow rate of 100 L / min is directly sprayed onto the furnace wall to supply 20 g of liquid raw materials containing 4% by weight of ferrocene benzene from the spray nozzle. / Minute. The shape of the sprayer at this time is a conical side shape (trumpet shape or umbrella shape), and the apex angle of the nozzle is 60°. Under such conditions, ferrocene is thermally decomposed to generate ...
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Abstract
Disclosed is a method for producing a sealing member (22) for piping materials having excellent chlorine resistance, which comprises a first step and a second step. The first step is a step wherein first carbon nanofibers produced by vapor deposition are subjected to an oxidation treatment, thereby obtaining second carbon nanofibers each having an oxidized surface. The second step is a step wherein carbon black having an average particle diameter of from 50 nm to 10 [mu]m and the second carbon nanofibers are mixed into an ethylene-propylene rubber and dispersed in the ethylene-propylene rubber by a shearing force.
Description
technical field [0001] The present invention relates to a sealing material for a piping material excellent in chlorine resistance, a method for producing a sealing material for a piping material excellent in chlorine resistance, a sealing material for a piping material excellent in oil resistance, and a piping material. Background technique [0002] Seals made of elastic materials such as rubber are installed in pipes for various fluids such as water, oil, and gas, and valves and other piping materials for opening and closing the flow paths of these fluids. Various properties such as hardness, tensile strength, elongation, tear strength, compression elasticity, abrasion resistance, oil resistance, chemical resistance, high temperature resistance, and gas permeability resistance are required for such sealing materials for piping materials. (For example, refer to Japanese Patent No. 2932420). Therefore, in the past, various types of ethylene-propylene rubber (EPDM) excellent ...
Claims
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IPC IPC(8): C09K3/10C01B31/00D01F9/127D06M11/34F16J15/10
CPCC01B2202/32C09K2200/0208B82Y40/00B82Y30/00C08J2323/16C09K2200/0282C01P2002/82C01B31/0253C01B2202/36C09K3/10C01B2202/34C09K2200/062C09K2200/0617C01B31/04C08J5/005F16K1/2265C01P2006/80C08K3/04C08K7/06C08K9/02C08L2203/18C08K2201/011C08K2201/003C08L23/16C01B32/168
Inventor 野口徹植木宏之浅野祐一
Owner HITACHI ASTEMO LTD