Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Crosslinking agents for PVB / PVF
Q. Just came across your forum while trying to find some info on the web. I am trying to coat an electroplated copper layer with a polymer to insulate it from another layer I plan to put on top. I know that there are loads of insulator systems available but the problem is that I have to use screen-printing to put on the layer. Those I have found before dry too soon on the screen or the layers short after electroplating the second layer. At the moment I use PVB or PVF in a solvent but the layers are not stable. Now, if I could get a crosslinking agent, either UV of temperature activated, I figure that my problem could be solved.
So, If anyone knows of an easily available crosslinker which does the trick (or has a good chance) I would love to hear from you. Of course other suggestions are also welcome.
Many thanks for any help.
University of Limerick - Limerick, Ireland
2001
A. Dear Mr Egan,
In practice PVB is able to react with cross-linking partners such as phenolic, epoxide and melamine resins (application high-quality stoving enamels). For air drying, cross-linkable coating systems adequately catalyzed phenolic, urea and melamine resin, as well as polyisocyanate and dialdehyde combination partners are used.
I do not know if this information will help you to solve your problem, but I hope so.
Clariant GmbH/ Div. CEP/BU PVA/PVB/ Marketing - Sulzbach, Germany
2001
PVB ADHESIVE
Q. SHALL APPRECIATE RECEIVING AN ASSISTANCE FOR THE FOLLOWING:
1. POLYVINYL BUTYRAL (COATING RESIN) MANUFACTURING PROCESS (FOR DOMESTIC PRODUCTION), RATIO OF EACH INGREDIENT FOR CROSS LINKING. IT IS WELL KNOWN THAT PVB IS PRODUCED FROM BUTYRAL DEHYDE AND PVA
(ALCOHOL), BUT UNAWARE HOW TO PRODUCE BUTYRAL DEHYDE, AND WHAT THE RATION OF PVA TO ADD THEREIN FOR END PRODUCT PVB. THE ABOVE LAMINATION TO BE USED FOR HIGH TEMPERATURE COATING AT HEATERS.
2.WHAT SHOULD BE THE ADHESIVE TO MAKE A BUFFING COMPOUND, I.E. BINDER OF POLISHING GRADE Al2O3. I HAD BEEN USING WAXES, BUT THEY DULL THE SHINE/GLOSS OF THE BUFFED METAL PRODUCTS.
THANK YOU FOR YOUR KIND ASSISTANCE AT AN EARLIEST.
KHATRI & SON - KARACHI, Pakistan
2001
What crosslinker to make PVA hard after photo exposure?
Q. I have been researching photoimaging PVA with dichromate but get very soft modified film of PV after exposure. Can anybody help me finding any crosslinker to work with PVA which makes it hard after photo exposure?
Thanks.
SPECIALTY CHEMICAL - KARACHI, SIND, PAKISTAN
2004
A. PVA photoresist is polymerised by Cr(VI). It can also be partially hardened with Cr(VI), but good curing requires heating to about 200 °C.
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
2004
Q. I am trying the same and saw on a patent that PVB can be thermally cross-linked at about 150-200 °C for a couple of hours. I have done something like this in the past, so I'm sure it can be done. I'm just trying to reproduce old results.
Let me know what you find out,
- Philipsburg, Pennsylvania
November 30, 2009
Q. Hi!,
I'm working with PVA for casting soluble plastic bags for the aquaculture needs of our company. We cultivate salmon and we're looking for more friendly use of packing.
My question is about PVA, when we process through extrusion melting with plasticizing agent, the PVA sticks in the extruder body and disrupts melting temperature or decomposes at 180 °C.
Which type of plasticizing agent and additives can we use to reduce the melting point and vulnerability of materials to moisture?
Green Researcher - Chile
April 1, 2011
Q. Does anyone happen to know the formulation for Polyvinyl Butyral?
Kellie Quillen- Kingsport, Tennessee, USA
November 12, 2013
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