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Crosslinkabel rubber composition and crosslinked object

A rubber composition and a cross-linking technology, applied in the field of cross-linkable rubber compositions and their cross-linked products, can solve the problems that the mechanical properties of high weather resistance, bending fatigue resistance, such as dynamic ozone resistance, cannot be fully satisfied, etc. Highly effective effect with excellent mechanical properties

Inactive Publication Date: 2006-11-08
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the inventors of the present invention studied this cross-linked rubber, it was found that this rubber could not sufficiently satisfy high weather resistance such as dynamic ozone resistance and high mechanical properties such as bending fatigue resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0093] Cross-linkable rubber composition and preparation method of cross-linked product

[0094] The method for preparing the crosslinkable rubber composition of the present invention is not particularly limited, and it may be prepared by a usual method for preparing a rubber composition. For example, the nitrile copolymer rubber (A), the acrylic polymer (B) and the crosslinking agent (C) may be kneaded after adding additives as necessary using an internal mixer or an open mill. When blending a crosslinking agent (C), a crosslinking accelerator, a crosslinking auxiliary agent, etc., it is preferable to adjust the temperature and mix so that the temperature after blending is not higher than the crosslinking initiation temperature.

[0095] The method of crosslinking the crosslinkable rubber composition of the present invention to obtain a crosslinked product is not particularly limited. For example, the temperature at the time of crosslinking can be adjusted to preferably 100 ...

Embodiment

[0098] Examples are given below to further specifically illustrate the present invention. The following "parts" and "%" are weight standards unless otherwise specified. The test and evaluation of each characteristic were performed as follows.

[0099] (1) Tensile strength

[0100] Among the normal physical properties of rubber cross-linked products, tensile strength, elongation and 100% tensile stress, after making a sheet-like cross-linked product, punch out a dumbbell-shaped No. 3 test piece, according to JIS K6251 As a standard, the measurement was performed at a tensile speed of 500 mm / min.

[0101] (2) Compression set

[0102] The compression set of the crosslinked rubber sample was measured in accordance with JIS K6262. The test conditions were 25% compression rate, 100°C, and 22 hours.

[0103] (3) Oil resistance

[0104] According to JIS K6258, the test crosslinked sheet was immersed in test oil (IRM903) adjusted to 100° C., and the volume swelling degree ΔV (uni...

reference example 1

[0109] Reference example 1 (preparation example of nitrile copolymer rubber a)

[0110] In a reactor with a thermometer and a stirring device, add 200 parts of ion-exchanged water, 0.25 parts of sodium dodecylbenzenesulfonate, 36 parts of acrylonitrile, 3 parts of n-butyl fumarate and 0.5 parts of molecular weight adjustment The agent tert-dodecyl mercaptan was degassed and replaced with nitrogen by decompression, and after repeating the operation 3 times to fully remove oxygen, 61 parts of butadiene was added. The reactor was kept at 5° C., 0.1 part of cumene hydroperoxide (polymerization initiator) and 0.01 part of ferrous sulfate were added, and emulsion polymerization was performed for 16 hours while stirring.

[0111] When the polymerization conversion rate is 85%, add 0.1 part of 10% hydroquinone aqueous solution as a polymerization stopper to stop the polymerization reaction, and then use a rotary evaporator to remove the remaining monomers at a water temperature of 60°...

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Abstract

A crosslinkable rubber composition which comprises a mixture consisting of a nitrile copolymer rubber (A) having a carboxy content of 2x10<-3> to 1x10<-1> eq / 100 g and an acrylic polymer (B) having a carboxy content of 4x10<-4> to 1x10<-1> eq / 100 g in a proportion of from 40 / 60 to 90 / 10 by weight and, incorporated in the mixture, a crosslinking agent (C) capable of forming crosslinks with carboxy groups of each of the nitrile copolymer rubber (A) and the acrylic polymer (B), wherein the amount of the crosslinking agent (C) incorporated, in terms of the amount of that functional group of the crosslinking agent which is reactive with carboxy groups, is 0.3 to 3 equivalents to the sum of the carboxy groups of each of the nitrile copolymer rubber (A) and the acrylic polymer (B). The crosslinkable rubber composition gives a crosslinked object which is excellent not only in mechanical properties including tensile strength and reduced compression set and oil resistance but in a high degree of weatherability including dynamic ozone resistance and a high degree of mechanical properties including flexural fatigue resistance.

Description

technical field [0001] The present invention relates to a cross-linkable rubber composition containing a nitrile copolymer rubber, an acrylic polymer and a cross-linking agent, and a cross-linked product thereof. A crosslinkable rubber composition of linked rubber and a crosslinked product thereof. Background technique [0002] Nitrile copolymer rubbers such as acrylonitrile-butadiene rubber (NBR) are known to be excellent in oil resistance. However, due to the influence of the unsaturated bond of the nitrile group, weather resistance such as ozone resistance is insufficient. Therefore, as an improved product, a composite high polymer obtained by mixing vinyl chloride resin with NBR and improving ozone resistance is used. However, although complex polymers are excellent in oil resistance and weather resistance, they have a problem of environmental pollution due to halogens when disposed of. [0003] In order to solve this problem, an attempt was made to blend NBR with an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L13/00C08K5/00C08K5/17
CPCC08K5/0025C08L13/00
Inventor 小田川义幸今田亮江守宣佳
Owner ZEON CORP
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