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Waterborne polyurethane coatings for furniture and joinery with solventlike performance

Waterbased polyurethane dispersions offered by Bayer MaterialScience are used for high-performance furniture and joinery coatings. Coatings based on these raw materials show the same high quality properties of solventborne systems or even exceed them, while at the same time being environmentally friendly and easy to process. Coatings based on polyurethane dispersions show:

High to very high gloss
Outstanding mechanical resistance
Good resistance against virtually every household substance
Good grain wetting (Anfeuerung)

With One- and Two-component polyurethane dispersions of the Bayhydrol® and Bayhydur® range almost any imaginable combination of properties and process requirements are possible.

Some dispersions and starting formulations for waterborne wood coatings:

Waterbased dispersions:

	Type	Solids in %	% OH on solids	Viscosity mPas at 23°C	Characteristics
Bayhydrol® A 2651	Polyacrylate dispersion	41	3.0	<200	For high-gloss, matte and clear pigmented topcoats, excellent grain wetting and high reactivity, very good mechanical and chemical resistance
Bayhydrol® A 2470	Polyacrylate dispersion	45	3.9	2000	For high-gloss topcoats, hard but flexible, with very good resistance and grain wetting
Bayhydrol® A 2427	Polyacrylate dispersion	42	2.0	80	Excellent chemical resistance, fast drying and blocking resistance
Bayhydrol® A XP 2469	Polyacrylate dispersion	45	2.5	1500	Tough but flexible with a good single-coat adhesion, good resistance to solvents and water
Bayhydrol® UH XP 2719	Polyurethane dispersion	40	-	60	Fast drying and good blocking resistance, combined with other anionic, hydrophilized dispersions.
Bayhydrol® AH XP 2741	Polyacrylate dispersion	40	-	< 100	clear and pigmented one-component primers and topcoats, very good chemical resistance, high hardness

Polyisocyanates for waterbased dispersions:

	Type	Solids in %	% NCO on solids	Viscosity mPas at 23°C	Characteristics
Bayhydur® XP 2655	HDI polyisicyanate	100	20.7	3500	Very good chemical resistance and easy formulation
Bayhydur® XP 2487/1	HDI polyisicyanate	100	20.6	5400	Very good chemical resistance
Bayhydur® XP 2759	IPDI- polyisocyanate	70	11.0	6500	Hydrophilic crosslinker in combination with HDI-based grades to enhance drying properties