miércoles, 2 de diciembre de 2009

THE GREAT VERSATILITY OF POLYURETHANE EMULSIONS

Innovation formulas from Bayer.
The aqueous 1K polyurethane dispersion solution for all indoor wood and glass coatings
Bayhydrol® UH 2593/1 is a unique binder that adds value to your formulations for parquet, furniture, joinery and glass coatings. Durability, drying speed andappearance are the attributes that describe the product best.The ecological, green label is not only because it is a solvent free aliphatic polyurethane dispersion, but it is also based on renewable resources - fatty acids. The latter undergo self crosslinking properties eventually leading to its high performance.
In Parquet Coatings:
Bayhydrol® UH 2593/1 provides very high black heel mar resistance (BHMR) and surface hardness. The transparency, wood warmth and gloss make the product particularly interesting for formulating glossy coatings. The easiness of downglossing and the fast drying lead to excellent semigloss and matt finishes.
Crosslinking with Bayhydur® 305 increases coating resistance while keeping the excellent transparency and wood warmth. Bayhydrol® AH XP 2741 is the first choice for PAC blending due to the high compatibility.
Get Technical Assistanceon coatings formulations containing polyurethane dispersions.
In Furniture Coatings:
Bayhydrol® UH 2593/1 brings high blocking resistance and scratch resistance to the coating. Therefore it's an interesting partner for blending with acrylic dispersions in 1K-WB coatings. Stain blocking is excellent, so it's an ideal choice for formulating 1K clear primers. The fast drying and high transparency are the advantages of Bayhydrol® UH 2593/1 as blending partner in the 2K-WB coatings (see graphs below). Very promising results are achieved also in waterbased UV-curing coatings, where the addition of Bayhydrol® UH 2593/1 to the polyurethane dispersion for UV curing improves the water releaseof the coatings and reduces the white pores effect significantly.

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GREEN CHEMICALS

The Green Seal certification is granted by the organization with that name and has a great number of members contributing with the requirements to pass a raw material or a chemical product as "green". Generally for a material to be green, has to comply with a series of characteristics like: near neutral pH, low volatility, non combustible, non toxic to aquatic life, be biodegradable as measured by oxygen demand in accordance with the OECD definition.
Also the materials have to meet with toxicity and health requirements regarding inhalation, dermal and eye contact. There is also a specific list of materials that are prohibited or restricted from formulations, like ozone-depleting compounds and alkylphenol ethoxylates amongst others. Please go to http://www.greenseal.com/ for complete information on their requirements.
For information on current issues regarding green chemicals, see the blog from the Journalist Doris De Guzman, in the ICIS at: http://www.icis.com/blogs/green-chemicals/.
Certification is an important — and confusing — aspect of green cleaning. Third-party certification is available for products that meet standards set by Green Seal, EcoLogo, Energy Star, the Carpet & Rug Institute and others.
Manufacturers can also hire independent labs to determine whether a product is environmentally preferable and then place the manufacturer’s own eco-logo on the product; this is called self-certification. Finally, some manufacturers label a product with words like “sustainable,” “green,” or “earth friendly” without any third-party verification.
“The fact that there is not a single authoritative standard to go by adds to the confusion,” says Steven L. Mack M.Ed., director of buildings and grounds service for Ohio University, Athens, Ohio.
In www.happi.com of June 2008 edition, there is a report of Natural formulating markets that also emphasises the fact that registration of "green formulas" is very confused at present, due to lack of direction and unification of criteria and that some governmental instittion (in my opinion the EPA) should take part in this very important issue.