Is Possible To Make PCB Photo Resistance Using Emulsion Paint

Discussion in 'General Electronics Chat' started by connect.electrospark.krr, Jan 27, 2016.

  1. connect.electrospark.krr

    Thread Starter New Member

    Jan 25, 2016
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    Hello Everyone,
    We had planned to make a PCB board. First we had tried screen printing by using iron process, we had successfully completed that and then we had decided to make PCB board by using UV exposure screen printing method.
    we had made setup for UV Exposure Unit by using 28 (2*14) watts CFL (because it produces UV Rays Large than Fluorescent) and placed printed OHP sheet on copper Board and tested, process had failed on Non – pre sensitive copper clad board
    After that only we came to know that Photo Resistant and developer process should do before screening. During search we had find many photo resistant, but all are in foreign countries. But we had seen photo resistant developer in forum and also presently we had purchased sodium met silicate penta hydrate for developing.
    Now we request you tell, is possible to use Asian tractor Emulsion paint for Photo Resistant, because it has acrylic acid (Attached Picture) or please write me any another Photo Resistant Emulsion or solution.
    Thanks In Advance
    Parthasarathi
    [​IMG]
    Edit Report
     
  2. Craps1956

    New Member

    Aug 21, 2015
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    Hello. Not sure about the paint you mentioned. I have successfully used enamel paint (all sorts of colours) (used in the hobby shops for painting model cars, tanks, aeroplanes, cars etc) It works very well and you don't have to wait for it to dry properly. I use Ferric Chloride to etch takes about 12minutes for a board 100mm x 150mm. Use any solvent to remove the paint afterwards. (Thinners, Benzine, Turps, Acetone (your wifes/girlfriend nail polish remover) and most other solvents from your local hardware shop and even at some general stores. Good luck
     
  3. hp1729

    Well-Known Member

    Nov 23, 2015
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    Re: emulsion paint
    Like water based home interior use?
    I don't think it would work in the same process as you used the enamel. The paint goes where the traces would be when etching? I can see using a dark emulsion paint in the photo process. Paint the places you want to etch away and harden the trace areas by UV.
     
  4. Craps1956

    New Member

    Aug 21, 2015
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    It is an oil based paint. I don't use photo sensitive boards or iron on screen printing methods. I do it the old fashioned way, I apply it directly onto the copper.
     
  5. hp1729

    Well-Known Member

    Nov 23, 2015
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    Before etching? Is it working okay for you?
     
  6. Craps1956

    New Member

    Aug 21, 2015
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    Works very well. Paint the tracks on the copper side then lay the board in the ferric chloride. All copper not covered with the enamel gets eaten away.
     
  7. connect.electrospark.krr

    Thread Starter New Member

    Jan 25, 2016
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    Thank You Craps1956

    i decide to buy, but i get another one question from your message.. while etching using ferrous chloride solution, the enamel paint will causes any reaction
     
  8. bertus

    Administrator

    Apr 5, 2008
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  9. connect.electrospark.krr

    Thread Starter New Member

    Jan 25, 2016
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  10. Techno Tronix

    Member

    Jan 10, 2015
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    I never heard about Making PCB Photo Resistance Using Emulsion Paint. Can someone show the pictures of that PCB?
     
  11. Craps1956

    New Member

    Aug 21, 2015
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    No. The paint is perfectly safe in the solution. I have been using it for many years. Just be careful with the ferric chloride, don't use metal containers they will be stained. If you get some on your fingers (it wont burn, only stain) just rinse your fingers and the board off with water . I use the garden hose in the garden to avoid getting stains on my kitchen sink.
     
  12. connect.electrospark.krr

    Thread Starter New Member

    Jan 25, 2016
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    Thank You so much

    regards
    Parthasarathi
     
  13. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    I understand that ferric chloride will attack stainless steel, so keep it away from your kitchen sink!!
     
    cmartinez likes this.
  14. Craps1956

    New Member

    Aug 21, 2015
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    Tried the pen but did not work for me. Also very expensive compared to the enamel paint. For about $1 I can make over a hundred boards +/- 100mm x 70mm in size
     
  15. Craps1956

    New Member

    Aug 21, 2015
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  16. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    Yup... it does... I know that from personal experience
     
  17. connect.electrospark.krr

    Thread Starter New Member

    Jan 25, 2016
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    Hello Craps1956,

    I had tried by using Asian Paints Premium Gloss Enamel (Picture Attached), I had directly applied paint over surface of copper on Copper Clad Board without diluting. after 5mins, I pasted OHP printout over paint and placed in sun light for 10 mins, after that I developed with SODIUM METASILICATE PENTAHYDRATE solution and finally I etched using ferric chloride (FeCl3)

    But copper was not etched and please tell where I made a mistake.

    Thanks

    Parthasarathi

    asianpaints_products_Gloss-enamel.png
     
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