Nitrile copolymer rubber composition, crosslinkable rubber composition and rubber crosslinked product
A technology of rubber composition and nitrile copolymer, which is applied in the field of cross-linked rubber composition and rubber cross-linked products, which can solve the problems of insufficient cold resistance and ozone resistance of rubber cross-linked products, and achieve oil resistance and permanent compression Excellent deformation effect
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preparation example Construction
[0089] As the preparation method of the crosslinkable rubber composition of the present invention, there is no particular limitation, as long as crosslinking agent and other compounding agents are added in the nitrile copolymer rubber composition obtained by the above-mentioned method, the mixture is passed through a roller kneader, a class The kneading can be carried out using a kneading machine such as a Burley mixer or a kneader.
[0090] In addition, the compounding order in this case is not particularly limited, as long as the components that are not easily reacted and decomposed when heated are fully mixed, the components that are easily decomposed when heated (crosslinking agent, crosslinking accelerator, etc.) will not decompose. It is enough to mix for a short time below the temperature.
[0091] rubber cross-linked
[0092] The rubber cross-linked product of the present invention is obtained by cross-linking the above-mentioned cross-linkable rubber composition of...
Embodiment
[0099] Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not limited to this Example. Unless otherwise specified, "part" in the following is a weight standard. The test or evaluation methods of physical properties and characteristics are as follows.
[0100] Mooney Viscosity (Polymer Mooney)
[0101] The Mooney viscosity (polymer Mooney) of the nitrile copolymer rubber was measured in accordance with JIS K6300 (unit: [ML1+4, 100° C.]).
[0102] Embrittlement temperature (cold resistance)
[0103] The cross-linkable rubber composition was put into a mold having a length of 15 cm, a width of 15 cm, and a depth of 0.2 cm, and compression molding was performed at 160° C. for 15 minutes while applying pressure to obtain a sheet-like cross-linked rubber product. Using the obtained sheet-like cross-linked rubber, the embrittlement temperature was measured according to JIS K6261. It can be...
manufacture example 1
[0110] Production example 1 (production of nitrile copolymer rubber (A-1))
[0111] 240 parts of water, 28 parts of acrylonitrile, and 2.5 parts of sodium dodecylbenzenesulfonate (emulsifier) were added to the reaction vessel, and the temperature was adjusted to 5°C. Next, after the gas phase was decompressed and degassed sufficiently, 72 parts of 1,3-butadiene, 0.04 parts of p-menthane hydroperoxide as a polymerization initiator, 0.02 parts of sodium ethylenediaminetetraacetate, 0.006 parts of ferrous sulfate (heptahydrate) and 0.06 parts of sodium formaldehyde sulfoxylate and 1 part of tert-dodecyl mercaptan as a chain transfer agent initiate the reaction of the first stage of emulsion polymerization. Then, when the polymerization conversion ratio with respect to the total amount of monomers charged reached 88% by weight, 0.3 parts of hydroxylamine sulfate and 0.2 parts of potassium hydroxide were added to terminate the polymerization reaction. After the reaction was te...
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Abstract
Description
Claims
Application Information
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