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  1. #46
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    Quote Originally Posted by Big Shed View Post
    Bentonite 34 is used in the paint industry as a general ant-settling agent.

    Perhaps pop in to your local paint manufacturer and offer to swap some for liquid refreshments?


    Thanks Fred, good tip, I hope that it's Bentone 34, not Bentonite, different stuff. Bentone is derived somehow from Bentonite.

    Being able to make your own petrobond is something that I'd definately be up for..

    Regards
    Ray

  2. #47
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    Yes Bentonite 34 is definitely different to Bentonite, there is also a Bentonite 38.

    We used this in paints to stop pigments from settling in the can over time. You can make some good gels with it as well by dispersing it in turps and adding a dash of metho, really increases its' effectiveness as an anti-settling agent.

    http://www.kianresin.com/TDS/Additives/bentone%2034.pdf

  3. #48
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    Quote Originally Posted by Big Shed View Post
    Yes Bentonite 34 is definitely different to Bentonite, there is also a Bentonite 38.

    We used this in paints to stop pigments from settling in the can over time. You can make some good gels with it as well by dispersing it in turps and adding a dash of metho, really increases its' effectiveness as an anti-settling agent.

    http://www.kianresin.com/TDS/Additives/bentone%2034.pdf
    Hi Fred,

    Just to clarify it a bit more precisely what's needed for oil bonded sand is Bentone not Bentonite

    I looked up Bentone 34, (same pdf as you've already linked to) and paint settling anti-settling is one of it's applications, so it could be a winner..

    Regards
    Ray

  4. #49
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    As I mentiond above, as well as Bentone 34 there are a couple of other Bentones as well. Bentone 27 is for use in systems using ketones and alcohols, Bentone 38 is used more in specialist industrial paint applications.

    Bentone 34 is the paint industry workhorse and any self respecting paint manufacturer uses it and should have it in stock.

    Bentonite is the clay that these 3 are derived from and can be bought in different grades, used extensively in the drilling industry for their muds as well to seal dams and a multitude of other industrial uses.

    I'll go back in to retirement now and hang up my white coat

  5. #50
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    Sounds like you may be onto something, I asked my (possible) son in law and he doesn't recognize the name, but from what I can gather Bentone is a brand name so they may have it under a different name where he works. He has also only been working there for a short time so may not have come across it yet.

    Interesting that you mention adding metho as the recipe linked before has alcohol as the final ingredient, which as my friend remembers turns the whole lot into a plasticine type of consistency. Unfortunately my friend cannot remember where he got the Bentone originally, it was 10 years ago...

    Looks like I better get stuck into some milky pine boards and get some patterns ready

    Cheers.

    Russell.

  6. #51
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    Hi Russell,

    We usually add a bit of isopropanol when the petrobond gets a bit "loose" it adds to the green strength somehow.

    For what it's worth methylated spirits is 95% ethanol, (the yanks call it DNA, denatured alcohol) whatever you call it, it's not methanol, If I remember correctly shell racing A was mostly methanol, but having said that I'm not clear if it makes any difference whether you use methanol or ethanol... ??

    Of course excepting one makes you drunk, the other will send you blind... ( literally)

    But it the recipe calls for methanol, then that's a good starting point..

    Regards
    Ray

  7. #52
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    Quote Originally Posted by RayG View Post
    Hi Russell,

    We usually add a bit of isopropanol when the petrobond gets a bit "loose" it adds to the green strength somehow.

    For what it's worth methylated spirits is 95% ethanol, (the yanks call it DNA, denatured alcohol) whatever you call it, it's not methanol, If I remember correctly shell racing A was mostly methanol, but having said that I'm not clear if it makes any difference whether you use methanol or ethanol... ??

    Of course excepting one makes you drunk, the other will send you blind... ( literally)

    But it the recipe calls for methanol, then that's a good starting point..

    Regards
    Ray
    I used to get methanol for remote control planes, i could get it from the hobby shops, but i think i got a 20l drum off it from the airport some years ago. Don't know if they will still sell it to you though, i got it pre 9-11, security around airports is alot tighter now.

    Ewan

  8. #53
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    The alcohol isn't too critical by the looks of it, the recipe mentions either alcohol (isopropyl, like the rubbing alcohol) or methanol, also a couple of other options that will work.

    Just gotta find some Bentone 34 and I am in business.

    I can post the test results here if anybody is interested, hope to have it sorted and start testing in a week or two.

    Russell.

  9. #54
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    Quote Originally Posted by epineh View Post
    Thanks Fred, I will look that up, the daughters boyfriend happens to work in the paint division of a hardware shop, might be time to call in a favor

    Russell.
    Russell, a paint SELLER is unlikely have ever heard of Bentone. You need to talk to a paint MANUFACTURER.
    Joe

  10. #55
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    Quote Originally Posted by jhovel View Post
    Russell, a paint SELLER is unlikely have ever heard of Bentone. You need to talk to a paint MANUFACTURER.
    Joe
    Yep, that's what I said

  11. #56
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    Righto, point taken.

    Will start the search next week.

    Cheers.

    Russell.

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