Method for testing the surface quality of a substrate

    公开(公告)号:GB2443530A

    公开(公告)日:2008-05-07

    申请号:GB0721068

    申请日:2007-10-26

    Abstract: An apparatus and method for testing the surface quality of a coated 5 or uncoated substrate 7, in which fibres 3 of a brush 1 are pressed with a predetermined force e.g. by a spring 9 against the substrate and the brush rotates 15 about a rotation shaft 11 arranged perpendicularly to the substrate surface. At the same time is the brush is moved parallel to the substrate surface for a predetermined duration following which it is established, e.g. by determining gloss reduction or weight of material removed, whether a surface inhomogeniety exists that can be attributed to deformation or abrasion. The brush may be driven by a motor 13 moved along a rail 17. The pressing force may increase with longitudinal movement to provide a damage gradient. The brush may be plate shaped and mounted centrally or eccentrically on the shaft. The bristles may be of synthetic material e.g. metal wire or plastics such as PE, PP or PVC.

    HÄRTBARE WÄSSRIGE POLYURETHANDISPERSIONEN

    公开(公告)号:DE50110048D1

    公开(公告)日:2006-07-20

    申请号:DE50110048

    申请日:2001-06-26

    Applicant: BASF AG

    Abstract: A curable aqueous polyurethane dispersion substantially comprises a) at least one compound having two free isocyanate groups, at least one allophanate group and at least one C-C double bond capable of free radical polymerization, a carbonyl group or an oxygen atom in the form of an ether function being bonded directly to the double bond, b) at least one compound having at least one group reactive toward isocyanate groups and having a C-C double bond capable of free-radical polymerization, c) if required, at least one compound having at least two groups reactive towards isocyanate groups and selected from hydroxyl, mercapto, primary and/or secondary amino groups, d) at least one compound having at least one group reactive towards isocyanate groups and having at least one acid group, e) at least one basic compound for neutralizing or partially neutralizing the acid groups of the compounds d), and a thermal initiator and is used for coating substrates.

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