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Hydrogenated NBR composition
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A technology of composition and mixture, which is applied in the direction of refrigeration and liquefaction, other chemical processes, chemical instruments and methods, etc., can solve the problems that cannot meet the wear resistance, HFC134a foam resistance, etc., and achieve the goal of ensuring the resistance to compression set Effect
Active Publication Date: 2020-04-24
NOK CORP
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[0013] Although the hydrogenated NBR compositions and sealing molding materials described in Patent Documents 1 to 3 achieve the desired purpose, they cannot satisfy various properties required for the function of the product with respect to HFC134a / PAG oil and HFO1234yf / POE oil, for example, Volume change rate relative to POE oil, wear resistance of products, foaming resistance to HFC134a, etc.
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preparation example Construction
[0038] The preparation of the hydrogenated NBR-based composition is carried out by kneading using a mixing machine such as an intermix, a kneader, a Banbury mixer, or an open roll (open roll); Cross-linking is carried out by using an injection molding machine, a compression moldingmachine, a vulcanization press, etc., by heating at about 150-200°C for about 3-60 minutes, and if necessary, heating at about 100-200°C for about 0.5-24 hours Left and right secondary crosslinking.
[0039] The hydrogenated NBR composition of the present invention can be effectively used as a cross-linked molding material for a lip seal material of a compressor, and the like. The lip seal material for compressors cross-linked and molded from this composition can be used particularly effectively for air-conditioning compressors using HFC134a / PAG oil and HFO1234yf / POE oil.
Embodiment 1
[0043]
[0044] Knead the above components with a kneader and an open roll, and cross-link the kneaded product through press vulcanization (primary vulcanization) at 170°C for 15 minutes and oven vulcanization (secondary vulcanization) at 165°C for 30 minutes. A cross-linked sheet (150 x 150 x 2 mm) and a P-24 size O-ring were obtained.
[0045] With respect to the obtained crosslinked sheet and P-24 O-ring, the following items were measured.
[0047] The rate of volume change after immersion in POE oil at 150°C for 70 hours was measured, and when ΔV was 6% or less, it was evaluated as ○, and when it exceeded it, it was evaluated as ×
[0048] Foam resistance to HFC134a, HFO1234yf:
[0049] Refrigerant immersion was carried out at 25°C for 24 hours, and then the appearance state (presence or absence of foaming) when heating at 150°C for 1 hour was visually observed, and no foaming was evaluated as ○, and foaming was evaluat...
Embodiment 2～11
[0057] In Example 1, the amounts (parts by weight) of each component other than the silane coupling agent and dicumyl peroxide were changed as shown in the table.
[0058] surface
[0059]
[0060] Note) Nipsil ER#100: Silicon dioxide made from Tosoh Silica, BET specific surface area 95m 2 / g
[0062] RS-700: Adekacizer plasticizer for ADEKA products
[0063] In the above Examples 1 to 11, all evaluation items were ◯ (among them, the compression set of Example 3 was ⊚).
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Abstract
A hydrogenated NBR composition obtained by compounding 100 parts by weight of a hydrogenated NBR blend comprising 35-50 wt% medium- to high-nitrile-content hydrogenated NBR having an acrylonitrile content of 30-38% and 65-50 wt% high-nitrile-content hydrogenated NBR having an acrylonitrile content of 40-46% with 40-80 parts by weight of silica having a BET specific surface area of 40-100 m2 / g and0.5-3 parts by weight of a silanecoupling agent. Due to the use of the blend of the medium- to high-nitrile-content hydrogenated NBR with the high-nitrile-content hydrogenated NBR, both foaming resistance in HFC134a and swelling resistance in POE oils can be attained. Furthermore, due to the use of the silane having the specific BET specific surface area and the silanecoupling agent, desired compression set characteristics and product wear resistance can be ensured. Namely, the hydrogenated NBR composition satisfies various properties required for product functions with respect to HFC134a / PAG oils and HFO1234yf / POE oils.
Description
technical field [0001] This invention relates to hydrogenated NBR compositions. More specifically, it relates to a cross-linked molding material that can be effectively used as a sealing material for compressors for HFC134a / PAG oil and HFO1234yf / POE oil, and the like. Background technique [0002] Refrigerating machine oils such as polyalkylene glycol oils (PAG oils) and polyol ester oils (POE oils) and / or assembly oils are used together with air-conditioning refrigerants such as HFC134a and HFO1234yf. [0003] Conventionally, HFC134a / PAG oil has been used as air-conditioning refrigerant / refrigerator oil, but HFC134a has a high GWP of 1300, so HFO1234yf has been announced as a refrigerant with a low GWP, and research for practical use is underway. [0004] The actual situation is that hydrogenated NBR is mainly used as a lip seal material for HFC134a / PAG oil, but compared with the environment where HFC134a / PAG oil is used, conventional hydrogenated NBR is used in the enviro...
Claims
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