Resilient coat for tie of direct-connection type track

Details Resilient coat for tie of direct-connection type track Resilient coat for tie of direct-connection type track

B - Operations, Transporting

32

B

117/161, 238/25

B32B 5/18 (2006.01) B32B 13/12 (2006.01) E01B 3/36 (2006.01) E01B 3/46 (2006.01)

Patent

CA 1283818

Title of the Invention: RESILIENT COAT FOR TIE OF DIRECT-CONNECTON TYPE TRACX Abstract of the Disclosure: A resilient coat for a direct connection-type tie (Danchoku tie) which is composed of a concrete tie body and a microcellular polyurethane elastomer coating layer which adheres to and coats the lower portion of the tie body to form an integral body therewith, and said microcellular polyurethane elastomer having urethane bonds and a bulk density of 0.4-0.75 g/cm3 and being prepared from the start- ing foamable liquid of urethane elastomer composed substan- tially of (a) a polyether polyol having an average number of functional groups of 2.5-4.5 and a number average molecular weight of 2000-8500, (b) a vinyl monomer-grafted polyol having an average number of functional groups of 2.5-4.0, and the graft ratio of 4-20% by weight, (c) a liquid poly- butadiene polyol having hydroxyl terminal group(s), an average number of functional groups of 2.0-3.0 and a number average molecular weight of 2000-7000, (d) an organic poly- isocyanate, (e) a chain extender, (f) a blowing agent, and (g) a urethanation catalyst, at such ratios that the NCO index is within the range of 90-110, and the concentration of the chain extender, based on the total amount of the five components of (a), (b), (c), (d) and (e), being 0.3 X 10-3 to 1.5 X 10-3 mol/g.

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