Crosslinkable rubber composition and use thereof

A rubber composition and composition technology, applied in the field of crosslinkable rubber composition, can solve the problems of non-crosslinking of rubber surface, decrease of strength characteristics, poor strength characteristics, etc., and achieve the effect of excellent compression set resistance

Inactive Publication Date: 2001-05-23
MITSUI CHEM INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem in this method: when performing hot air crosslinking (such as HAV (Hot Air Vulcanizer) or UHF (Ultra High Frequency Electromagnetic Wave)), the rubber surface is not crosslinked but degraded, resulting in remarkable scratch resistance decline
[0017] It is true that the rubber composition hardly stains molds, but it

Method used

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  • Crosslinkable rubber composition and use thereof
  • Crosslinkable rubber composition and use thereof

Examples

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Embodiment

[0579] The present invention is further described with reference to the following examples, but the present invention is by no means limited to these examples.

[0580] Obtain composition, iodine number, intrinsic viscosity (η), molecular weight distribution (Mw / Mn), γ of copolymer rubber in embodiment and comparative example 2 / γ 1 , effective network link density (ν), γ 2 / γ1 The relationship with the effective network chain density (indicative of crosslink density) can be measured or determined by the following method.

[0581] (1) Composition of copolymer rubber

[0582] use 13 The composition of the copolymer rubber was determined by C-NMR method.

[0583] (2) Iodine value of copolymer rubber

[0584] Determine the iodine value of the copolymer rubber by titration.

[0585] (3) Intrinsic viscosity (η)

[0586] The intrinsic viscosity (η) of the copolymer rubber was measured in decalin at 135°C.

[0587] (4) Molecular weight distribution (Mw / Mn)

[0588] The molec...

preparation Embodiment 1

[0617] Preparation of ethylene / propylene / 5-vinyl-2-norbornene random copolymer rubber (A-1)

[0618] The terpolymerization reaction of ethylene, propylene and 5-vinyl-2-norbornene was carried out continuously in a 100-liter stainless steel polymerization reactor equipped with stirring blades (stirring speed value: 250 rpm). To the liquid phase in the reactor was fed hexane at a rate of 60 liters / hour, ethylene at a rate of 3.7 kg / hour, propylene at a rate of 8.0 kg / hour, 5-vinyl-2-norbornene was added at a rate of 50 liters / hour, and hydrogen was added continuously at a rate of 50 liters / hour, and VOCl was added as a catalyst 3 (feed rate is 48 mmol / h), Al(Et) 2 Cl (feed rate 240 mmol / h) and Al(Et) 1.5 Cl 1.5 (feed rate 48 mmol / h).

[0619] By the copolymerization reaction under the above conditions, a homogeneous solution of ethylene / propylene / 5-vinyl-2-norbornene random copolymer rubber (A-1) was obtained.

[0620] Thereafter, a small amount of methanol was added to the...

preparation Embodiment 2 and 3

[0623] Obtain ethylene / propylene / 5-ethylene-2-norbornene random copolymer rubber (A-2) and ethylene / propylene / dicyclopentadiene with different properties in the same manner as Preparation Example 1 Random copolymer rubber (A-3), except that the polymerization conditions were changed as shown in Table 1. Table 1 shows the properties of the copolymer rubbers (A-2) and (A-3).

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Abstract

A rubber composition which is crosslinkable with hot air or a hot press and gives a hot-air-crosslinked rubber sheet which receives no scratch on the surface in an HB pencil hardness test and has a compression set of 70% or lower through 22-hour heat treatment at 150 DEG C. The composition comprises: an ethylene/ alpha -olefin/unconjugated polyene random copolymer rubber wherein the unconjugated polyene is a specific norbornene compound terminated by a vinyl group; and a compound having two or more SiH groups per molecule. It may optionally contain an addition reaction catalyst comprising a platinum-group metal and a reaction inhibitor.

Description

technical field [0001] The present invention relates to crosslinkable (vulcanizable) rubber compositions and their use. The present invention more particularly relates to such a kind of crosslinkable rubber composition, it has high vulcanization rate and good productivity, can carry out hot air crosslinking, as with HAV (hot air vulcanizer) or UHF (ultra high frequency electromagnetic wave ) cross-linking, has excellent various properties, such as compression set resistance, strength characteristics, heat resistance, weather resistance and wear resistance, and also relates to the application of the cross-linkable rubber composition. Background technique [0002] Ethylene / α-olefin / non-conjugated polyene random copolymer rubber (such as EPDM) usually has excellent weather resistance, heat resistance and ozone resistance, so this type of rubber can be used in automotive industry parts, industrial rubber products, electrical Insulating materials, construction and civil engineer...

Claims

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Application Information

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IPC IPC(8): C08J5/00C08J9/00C08L21/00C08L23/16C08L45/00C08L83/05
Inventor 白田孝川崎雅昭菊地义治仲滨秀齐神田拓龟田博野中修一细谷三树男石井雄二有野恭巨中村勉平林佐太央吉田武男
Owner MITSUI CHEM INC
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