-- The Home Page of the Finishing Industry
HomeFAQsBooksHelpWantedsForum letter 60320
Serious Education ... plus the most fun you can have in metal finishing.

How to obtain a PUD [Polyurethane Dispersion?]

November 14, 2016

Q. I have trying to stabilize a 2k-PU paint so I can use it for plating jewelry. I have used the following procedure:

- mix the 2k PU paint;
- dilute it by 20%;
- add acetic acid to disperse the PU;
- lastly, add water (about 80%).

However, 1 day after mixing it, the PU does not remain in suspension. It sediments and forms a kind of ball. Please, can anyone give me clue on what to do?

Walter Okpala
Plating shop employee - São Paulo,Brazil

November 2016

Hi Walter. Sorry but I'm not familiar with this. Are you suggesting that you believe that you can make a proper solution for CED electrocoating by dispersing reacted polyurethane into a solution of acetic acid and water?


pic of Ted Mooney
Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey

November 14, 2016

Q. Thank you for your quick response. As I said in my first question. I did the following:

(1) mixed the 2k-PU paint;

(2) diluted the 2k-PU by 20%;

(3) obtained the PU dispersion by adding 3% by volume of acetic acid as recommended in books;

(4) finally adding water (80% by volume) and mix it thoroughly so the dispersed PU can remain in suspension.

However, the PU dispersion did not remain in suspension for a long time. After 1 day, it started forming a kind o ball. I do not what to do to keep it in suspension before coating. Is there a special additive to be used for that purpose?

Walter Okpala
- São Paulo, Brazil

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It is not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & DevicesUsed & Surplus

©1995-2017     -    Privacy Policy
How Google uses data when you visit this site.