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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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Products: Graphene paint greenwash?

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      CommentAuthordjh
    • CommentTimeJul 10th 2019
     
    There was a story on the local news about paint that incorporates graphene. I won't mention the brand - it should be easy enough to find.

    It seems like overhyped greenwash to me, but I'd be interested in any other views.
    • CommentAuthorMike1
    • CommentTimeJul 11th 2019
     
    It may be a very good product (and it does look like the manufacturer takes their environmental credentials seriously, assuming their accreditations are as good as they sound) but the graphine elements do seem overhyped:

    corrosion resistant - my walls don't often rust.

    200 times stronger than steel - if you compare both in a layer 1 atom thick, but what about the strength of the paint layer? Enough to resist Sellotape (which is all you need to make your own graphene sample, BTW)?

    1000 times more conductive than copper - if you compare both in a layer 1 atom thick, but mixed in paint? If it actually was, would that make it dangerous in a bathroom, or useful for equipotential bonding?

    greater flexibility without damage - enough to be used on silicone sealant without flaking?

    supports the natural mineral elements of the paint - first define 'support'

    eases application - is painting that difficult?

    reduces maintenance - how does it compare to Teflon, or the glass flake epoxy coating on the Forth Bridge?

    faster painting - by what %age?

    improves thermal regulation - by a noticeable amount?

    requires less heating / air conditioning - by a noticeable amount?
    •  
      CommentAuthorfostertom
    • CommentTimeJul 11th 2019
     
    Posted By: Mike11000 times more conductive than copper
    A Faraday cage then? Kills phone signal/wifi (v gd)? Protection against 5G radiation?
    • CommentAuthorCWatters
    • CommentTimeJul 11th 2019
     
    One make of paint claims to contain "naturally occurring Graphene"...

    https://www.organicnaturalpaint.co.uk/natural-paint/natural-wall-paint-colours-gcs-interior-graphenstone/

    Graphite occurs in nature but I wasn't aware of significant quantities of Graphene occurring in nature. A bit of googling found it does..

    https://www.proactiveinvestors.co.uk/companies/news/106773/alabama-graphote-soars-on-evidence-of-more-naturally-occurring-graphene-106773.html

    However they say..

    Quote

    Despite the variety of research methods, nobody has managed to extract graphene such as to realize production on the mass scale required for commercial viability. Research and development costs remain exorbitant.
  5.  
    Posted By: fostertom
    Posted By: Mike11000 times more conductive than copper
    A Faraday cage then? Kills phone signal/wifi (v gd)? Protection against 5G radiation?


    Saw this today and thought of you Tom:


    "Keeping it private … Barack Obama is briefed in a tinfoil-lined tent on the situation in Libya, 2011. Photograph: Pete Souza/Official White House Photo"
    https://www.theguardian.com/world/2019/jul/11/can-we-talk-in-confidence-the-death-of-candour-in-the-age-of-surveillance#img-3
    • CommentAuthorCWatters
    • CommentTimeJul 11th 2019
     
    •  
      CommentAuthordjh
    • CommentTimeJul 11th 2019
     
    The thing that first struck me was the claim about CO2 absorption. They make it sound like it's something unique but when you read more, you realize that all they're saying is that the lime base reabsorbs the CO2 it emitted when it was made. Just like any old limewash does.

    They then compound this by wording it so it looks like it absorbs this amount every year, by comparing the total amount absorbed over its lifetime to the amount a tree absorbs every year.

    Comparisons are made against synthetic paints and limewash but notably not against silicate mineral paints which are the first thing to look at for low-maintenance, natural ingredients, low emissions paint. Nor against clay paint for that matter.

    The TV article showed the paint being rollered on, apparently achieving good coverage in a single coat, so it's definitely different to limewash or silicate paints in that regard and easier to use I guess.

    I don't understand the claims about high conductivity, either electrical or thermal. I can't see how flakes of a conductor surrounded by a ceramic binder will achive that. But more importantly, I can't see why it matters.

    I don't see the point/advantage of a two-dimensional material in concrete either. It notably doesn't claim any increase in tensile strength, which is what conventional fibre additives are measured on AIUI.

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