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Sunday, 23 February 2020
Raw materials & technologies, Raw materials, Coatings binders

PUR backbones improved for internal stabilisation of PUR dispersions

Wednesday, 24 October 2012

Most PUR dispersions are only anionically stabilised. But what if it is necessary to achieve a good stability at lower pH levels and improved shear stability?

Nonionic diols stabilise PUDs

Source: Perstorp

Nonionic diols stabilise PUDs

Source: Perstorp

In these cases nonionic stabilisation or a combination of anionic/nonionic stabilisation is preferred.

The benefits of using a nonionic diol are:

  • Simple processing
  • It is possible to use solventfree
  • Low odor and less/none amine emissions
  • Electrolyte stability
  • Freeze/thaw stability
  • Solvent resistance
  • Flexibility
  • High solid PUDs

A suitable initial content of nonionic diol and Dimethylolpropionic acid (Bis-MPA) is about 2.5 and 10 % by weight respectively, based on dry polyurethane weight. In tests, publised in paintindia September 2012, pages 73-76, Henrik Bernquist from Perstorp AB in Sweden and his colleagues from Perstorp Chemicals India Pvt. Ltd. showed that this combination displays good stability to electrolytes and is resistant against shear. In addition, the resulting polyurethane coatings have improved resistance to polar solvents.

By combining nonionic and anionic stabilisation the need for a neutralising amine is reduced resulting in low odor PUD with less amine emissions.

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