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Highly saturated nitrile rubber composition and rubber crosslinked product

A technology of rubber composition and nitrile rubber, which is applied in the field of rubber cross-linked products, can solve problems such as unsuitable sealing materials and insufficient compressive stress, and achieve excellent effects of heat resistance and fuel oil resistance

Active Publication Date: 2019-04-05
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the technology of this patent document 1, although a rubber cross-linked product excellent in heat resistance and fuel oil resistance can be obtained, the compressive stress is not sufficient, so it is not suitable for sealing materials, especially high-pressure seals used in high-pressure environments. Material use

Method used

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  • Highly saturated nitrile rubber composition and rubber crosslinked product

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0089] Preparation of highly saturated nitrile rubber composition

[0090] The highly saturated nitrile rubber composition of the present invention is by the above-mentioned highly saturated nitrile rubber (A1), highly saturated nitrile rubber (A2) and polyester resin (B) containing carboxyl group above the fusing point of polyester resin (B) prepared by mixing. In the present invention, by mixing the polyester resin (B) at a temperature higher than the melting point of the polyester resin (B), the polyester resin (B) can be mixed in a molten state, so that the carboxyl group-containing highly saturated nitrile rubber can be uniformly mixed (A1), highly saturated nitrile rubber (A2) and polyester resin (B). Moreover, the effect brought about by the blending of the polyester resin (B) can be appropriately obtained, that is, the cross-linked rubber cross-linked product can be made 100% tensile stress-improved, thereby heat resistance and fuel resistance Excellent oiliness, t...

Embodiment

[0120] 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.

[0121] rubber composition

[0122] The content ratio of each monomer unit constituting the highly saturated nitrile rubber was measured by the following method.

[0123] That is, the content ratio of mono-n-butyl maleate unit was calculated by adding 100 mL of 2-butanone to 0.2 g of 2 mm square highly saturated nitrile rubber, stirring for 16 hours, and then adding 20 mL of ethanol With the water of 10mL, while stirring, carry out the titration using the 0.02N aqueous ethanol solution of potassium hydroxide, with thymolphthalein as indicator at room temperature, thus obtain the molar number of the carboxyl group of the highly saturated ni...

Synthetic example 1

[0141] Synthesis Example 1 (Synthesis of Carboxyl Group-Containing Highly Saturated Nitrile Rubber (a1-1))

[0142] 180 parts of ion-exchanged water, 25 parts of 10% by weight sodium dodecylbenzenesulfonate aqueous solution, 36 parts of acrylonitrile, 4 parts of mono-n-butyl maleate and 0.5 parts of tert-dodecane The base mercaptan (molecular weight modifier) ​​was sequentially added to the reactor, and after replacing the gas inside with nitrogen three times, 60 parts of 1,3-butadiene was added. Next, keep the reactor at 5°C, add 0.1 parts of cumene hydroperoxide (polymerization initiator), and continue the polymerization reaction while stirring. When the polymerization conversion rate reaches 85%, add 0.1 parts of a concentration of 10 wt. % hydroquinone aqueous solution (polymerization terminator) to terminate the polymerization reaction. Next, residual monomers were removed under reduced pressure at a water temperature of 60° C. to obtain a latex of carboxyl group-conta...

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Abstract

The invention provides a kind of highly saturated nitrile rubber composition, and it is by the highly saturated nitrile rubber (A1) containing carboxyl group of 7~40 weight %, the highly saturated nitrile rubber (A2) of 10~78 weight % and 15~50 % by weight of polyester resin (B) obtained by mixing at a temperature above the melting point of the above-mentioned polyester resin (B), and the above-mentioned carboxyl group-containing highly saturated nitrile rubber (A1) contains 15 to 60% by weight of α,β- Ethylenically unsaturated nitrile monomer units and 1 to 60% by weight of α, β-ethylenically unsaturated dicarboxylic acid monoester monomer units, the iodine value is below 120, and the above-mentioned highly saturated nitrile rubber (A2) contains 15 to 60 % by weight of α,β-ethylenically unsaturated nitrile monomer units, the content of α,β-ethylenically unsaturated dicarboxylic acid monoester monomer units is 0.9% by weight or less, and the iodine value is 120 or less.

Description

technical field [0001] The present invention relates to a highly saturated nitrile rubber composition capable of forming a rubber cross-linked product having excellent heat resistance and fuel oil resistance, and a highly balanced tensile strength, elongation and compressive stress, and a rubber cross-linked product obtained by using the rubber composition. United things. Background technique [0002] Conventionally, nitrile rubber (acrylonitrile-butadiene copolymer rubber) has been used as a material for automotive rubber parts such as hoses and inner tubes, taking advantage of fuel oil resistance, mechanical properties, and chemical resistance. Hydrogenated nitrile rubber (highly saturated nitrile rubber) in which the carbon-carbon double bond in the polymer main chain of the rubber is hydrogenated is further excellent in heat resistance, so it is used for rubber parts such as hoses, sealing materials, gaskets, and separators. [0003] In recent years, the requirements fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L13/00C08L33/18C08L67/00
CPCC08F236/06C08L15/005C08F220/44C08F222/16C08F2/06C08L23/08C08L47/00C08L67/02C08K3/04C08K5/09C08K5/18C08K5/14C08L13/00C08L33/18C08L67/00C08F236/12
Inventor 福峰义雄
Owner ZEON CORP
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