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    Bitumen-carbon black concentrate for prodn. of bitumen end products
    2.
    发明专利
    Bitumen-carbon black concentrate for prodn. of bitumen end products 未知

    公开(公告)号：DE4402369A1

    公开(公告)日：1995-08-03

    申请号：DE4402369

    申请日：1994-01-27

    Applicant: DEGUSSA

    Inventor： BARTHEL WALTER ,  KLEINHENZ HORST ,  LEIMANN JUERGEN DR ,  MATHIAS JOHANN DR

    IPC: C08J3/22 ,  C08K3/04 ,  C08L95/00 ,  E01C7/18 ,  E04D7/00 ,  E01C7/22

    Abstract: A bitumen/carbon black concentrate (I) contains 1-45 wt.% carbon black (II) and has a Grindometer (RTM) value of less than 50 microns. Concentrates contg. up to 40 wt.% carbon black, e.g. Printex A powder (RTM), were prepd. by mixing bitumen B80 with the powder at 150 deg C. in a LUK 3IInS kneader (RTM). The Grindometer values obtd. (after dilution to 7.5% with more bitumen in a dissolver at 4000 r.p.m.) were less than 10 microns; stirrer speeds of 2000 rm.p.m. or less gave values of above 50 microns. The 7.5% concentrate was mixed with an asphalt compsn. contg. 7.5 wt.% bitumen, 9.98 wt.% filler, 20.4 wt.% sand and 62.6 wt.% grit, to give a final carbon black content of 0.6 wt.%. The prod. had a crack sensitivity (time taken to reach the inflection in the deflection/time curve) of 6300 secs.; this was increased to 11,000 secs. after accelerated weathering (500 hrs. in a Q-U-V appts. (RTM) at 50 deg C. with a 4-hr. moisture/irradiation cycle). (cf. 2900 secs., falling to 2400 secs. after weathering, with 0.6 wt.% pptd. silica instead of carbon black).

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