Track pad and cross-linked foam for railway rails

A technology for cross-linking foam and track pads, applied in the field of cross-linking, can solve the problems of insufficient foaming and balance of physical properties, and achieve small compression set, excellent processability, high tensile strength and elongation. effect of length

Active Publication Date: 2016-06-15
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when such EPDM is used for a track pad, since the main chain does not contain a diene, although the weather resistance is good, the foamability and the balance of physical properties are insufficient.

Method used

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  • Track pad and cross-linked foam for railway rails
  • Track pad and cross-linked foam for railway rails
  • Track pad and cross-linked foam for railway rails

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0199] [Preparation of rubber composition and its vulcanized rubber molding]

[0200] The rubber composition used in the present invention can be prepared as follows: using internal mixers (internal mixer) such as Banbury mixer (Banbury mixer), kneader (kneader), mixer (intermix) and the like, at 80 ~ Knead ethylene·α-olefin·non-conjugated polyene copolymer rubber [I], carbon black, rubber reinforcing agent, inorganic filler, softener and other additives at a temperature of 170°C for 2 to 20 minutes, and then use the open Rolls such as rollers or kneaders knead sulfur, add and mix vulcanization accelerators, vulcanization aids, foaming agents, and foaming aids as needed, and knead at a roll temperature of 40-80°C for 5-30 minutes , and then tableted, thus prepared.

[0201]

[0202] The cross-linked rubber used in the present invention is characterized by cross-linking the rubber composition described above. As a method of crosslinking the rubber composition, the following...

Embodiment 1 and 2

[0226] Use the following copolymers 1 and 2 to prepare the compositions shown in Table 1, use a mold of 125mm x 140mm x 10mmt, fill the mold with the composition of Table 1 at a volume filling rate of 100%, and heat it at 130°C for 15 minutes Carry out cross-linking and foaming once under the same conditions, and then use a mold of 200mm×200mm×1mmt to fill the cross-linked foam obtained from the first cross-linking and foaming, and perform two times of cross-linking under the condition of 170°C×10 minutes The foamed cross-linked rubber for railway track pads was produced by foaming, and various physical properties were evaluated.

[0227] [Copolymer 1]

[0228] Ethylene·α-olefin·non-conjugated polyene random copolymer produced by the same method as in Example 1 of International Publication No. WO2010 / 064574 (the molar ratio is different and the feed amount is adjusted)

[0229] [C-1] = ENB

[0230] [C-2] = VNB

[0231] Requirement (1): [B]=36.8 mol%

[0232] Requirement (2...

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Abstract

Provided is a railroad rail track pad obtained by crosslinking a composition containing an ethylene / alpha-olefin / non-conjugated polyene random copolymer which includes structural units of ethylene [A], C3-20alpha-olefin [B], and a non-conjugated polyene [C-1] containing one of the structures of formulae (I) and (II) [formula (I) is partial structure of a cyclic olefin], and a non-conjugated polyene [C-2] containing two or more of structures of formulae (I) and (II), and which fulfills (1) [B] is a 10-50 mol%, (2) the total of [C-1] and [C-2] is 1.0-6.0 mol%, (3) [C-1] / [C-2] is 75 / 25 to 99.5 / 0.5, (4) ML1+4(100°C) is 10-90, (5) the iodine value of [C-2] is 0.1-3.0g / 100g, and (6) 50 > flow activation energy (Ea) > 35.

Description

technical field [0001] The present invention relates to a track pad for railway rails and a cross-linked foam formed of a cross-linked body or a cross-linked foam. More specifically, it relates to a rail mat for railway rails and a crosslinked foam obtained from a rubber composition exhibiting sufficient high foamability, and more specifically, it relates to a railroad track mat formed of a crosslinked body or a crosslinked foam. A track pad for a railroad track and a cross-linked foam. The cross-linked body or cross-linked foam requires various physical properties (including weather resistance) such as a moderate elastic modulus, high tensile strength and elongation, and small compression set. ), and form a low specific gravity rubber molded body that is also excellent in processability. Background technique [0002] Railroad mats are used as anti-vibration materials for reducing vibration and noise generated when vehicles run on railroad tracks (railways). The railway ma...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): E01B9/68C08F210/18C08L23/08
CPCE01B9/68C08F210/18C08J9/0014C08J9/0066C08J9/103C08J2201/026C08J2323/08C08L23/16C08L2312/00C08L2314/06E01B9/681
Inventor野口裕司竹原明宣野中修一
OwnerMITSUI CHEM INC