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  1. clandestinho

    fungicide for 2K polyurethane coating in marine environment

    Hello everyone, I am looking for an efficient fungicide for a 2K polyurethane coating (polycarbonate based PUD and HDI). This coating will be used in a marine environment on a substrate that's semi-porous. The problem is mainly with black mold thriving extremely well on this hard but somewhat...
  2. clandestinho

    selecting a temperature sensor for air/solvent vapor

    hello, I need to select a temperature sensor for an air flow containing solvent vapours. My criteria are - fast response. This is top priority - fair accuracy and repeatability. I would choose a 3-wire pt100 if it had a faster response - good chemical resistance. I would prefer an exposed...
  3. clandestinho

    Yellowing of Polyarylate

    Hi, I have an application where I would like to use polyarylate. It will be solvent cast into a thin film, 10 micron or there about. My only problem with this is that Polyarylate goes from clear, transparent to yellow when exposed to UV due to some rearrangement in the polymer chain. I...
  4. clandestinho

    UV protection in thin layer PU coating

    Hi, I need to coat a solvent borne 2K polyurethane coating onto a flexible plastic (PET) surface. The coating thickness can't be more than 10-12 micron in order to stay flexible. The coating will have some light stabilisers (HALS) to protect the coating itself but I also have to add...
  5. clandestinho

    UV stabilizing of Polysulfone / polyethersulfone

    Hi all, can anyone suggest a way to UV stabilize polysulfone or polyethersulfone (Solvay´s Udel or Veradel) that will allow outdoor use? I have found some evidence that benzotriazole UV absorber in 1% concentration can do something but I am not sure that it will be enough. Anyone with...
  6. clandestinho

    PU coating to bond to polypropylene?

    Hi, I need to develop a PU coating resin that bonds to polypropylene. It needs to be a 2K solvent borne system and it's for a textile so it must be reasonably flexible. The isocyanate must be aliphatic. I am not looking for a soft PU dispersion for textile coating but rather a fairly tough...
  7. clandestinho

    A method for refining bottle grade PEN ?

    Hi all polymer people, this question is way outside my field so please bear with me if it's trivial or just impossible: I am trying to find out if there's a way to refine a bottle grade PEN (polyethylene naphthalate) resin into a higher I.V. grade? For example, is it possible to take a medium...
  8. clandestinho

    Painting on cast bronze

    Hi, does someone know a paint system that will work on cast bronze? I need to paint some machined parts for sea water pumps which will be used in a marine environment. I don't know what the particular alloy is but most likely the parts contain lead. any advice will be highly appreciated...
  9. clandestinho

    solvent for HDPE

    Hi does anybody know a good solvent for HDPE other than xylene? I need to solution impregnate a woven fabric with HDPE and I am after a solvent which is less harmful to health and environment and if possible with a lower boiling point. any ideas? Thanks!
  10. clandestinho

    thermplastic prepregging methods and machinery

    Hi all, Does anyone have ideas to how thermoplastic prepregs can be manufactured on a smaller scale? I need to prepreg my own woven fabrics with various thermoplastics (from HDPE to PEEK) and I have identified 2 possible routes: solution impregnation using thermoplastic resins dissolved in...

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