Nitrile rubber composition, crosslinkable nitrile rubber composition and crosslinked rubber article
A technology of nitrile rubber and composition, applied in the field of cross-linkable nitrile rubber composition and rubber cross-linked product, can solve the problem that heat resistance is not necessarily sufficient, and achieve the effect of excellent compression set resistance and heat resistance
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[0131] Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. Hereinafter, unless otherwise specified, "parts" are based on weight. In addition, tests and evaluations are as follows.
[0132] Carboxyl content
[0133] Add 100mL of 2-butanone to 0.2g of 2mm square carboxy-containing highly saturated nitrile rubber, stir for 16 hours, then add 20mL of ethanol and 10mL of water, and use a 0.02N aqueous ethanol solution of potassium hydroxide while stirring , titration using thymolphthalein as an indicator at room temperature, thereby obtaining the carboxyl group content (unit: ephr) as the number of moles of carboxyl groups relative to 100 g of rubber.
[0134] Composition of carboxyl-containing highly saturated nitrile rubber
[0135] The content ratio of each monomer unit constituting the carboxyl group-containing highly saturated nitrile rubber was measured by the following method.
[0136] That is, the co...
manufacture example 1
[0150] Production example 1: Production of carboxyl group-containing highly saturated nitrile rubber (A-1)
[0151] Add 180 parts of ion-exchanged water, 25 parts of concentration of 10% by weight of sodium dodecylbenzenesulfonate aqueous solution, 37 parts of acrylonitrile, 6 parts of mono-n-butyl maleate, 0.75 parts of tertiary dodecyl mercaptan (molecular weight regulator), after substituting the internal gas with nitrogen three times, 57 parts of 1,3-butadiene were added. The metal bottle was kept at 5° C., 0.1 part of cumene hydroperoxide (polymerization initiator) was added, and a polymerization reaction was performed for 16 hours while rotating the metal bottle. Then, 0.1 part of hydroquinone aqueous solution (polymerization terminator) with a concentration of 10% by weight was added to terminate the polymerization reaction, and then, the residual monomer was removed using a rotary evaporator with a water temperature of 60° C. to obtain acrylonitrile-butadiene- Latex...
manufacture example 2
[0154] Production example 2: Production of carboxyl group-containing highly saturated nitrile rubber (A-2)
[0155] The compounding amount of acrylonitrile was changed to 45 parts, the compounding amount of mono-n-butyl maleate was changed to 6 parts, and the compounding amount of 1,3-butadiene was changed to 49 parts. In the same manner, a nitrile group-containing highly saturated nitrile rubber (A-2) was obtained. The iodine value of the obtained carboxyl-containing highly saturated nitrile rubber (A-2) is 9, and the carboxyl content is 3.0×10 -2 ephr, polymer Mooney viscosity (ML 1+4 , 100°C) is 40. In addition, the obtained carboxyl group-containing highly saturated nitrile rubber (A-2) contained 45.4% by weight of acrylonitrile units, 49.7% by weight of butadiene units (including hydrogenated parts), and 4.9% by weight of mono-n-butyl maleate units. weight%.
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Abstract
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