Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF9 Cites 31 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 has the disadvantage of slightly inferior strength properties
The decrease in strength characteristics is considered to be due to the fact that the crosslinking rate of ethylene / α-olefin / non-conjugated polyene random copolymer rubber is lower than that of silicone rubber when organic peroxide crosslinking agents are used. Poor cross-linking

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Crosslinkable rubber composition and use thereof
  • Crosslinkable rubber composition and use thereof

Examples

Experimental program
Comparison scheme
Effect test

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).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Thicknessaaaaaaaaaa
Intrinsic viscosityaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com