domingo, 20 de septiembre de 2009

BEST USE OF CELLULOSE ESTER AS THICKENERS

When using Carboxy methyl-ethyl-propyl cellulose or other cellulose ester to obtain a high viscosity solution, the best way to obtain a quick dissolution in water, even cold, with no lumps, is to lower the pH of the water to 7 or 6 , add the powder and after its all suspended and distributed, the raise the pH to 8- 9 or more, this will complete the thickening process smoothly

martes, 1 de septiembre de 2009

HOW TO CONVERT IRON OXIDE (RUST)

The most convenient way to convert iron oxide , rust, is to use a formula based on tannic acid, round 5-9 % and use a polymer to form a bond to the surface. On application, the rust will start converting to the tannate salt and change to a black color. This will remain so for long, protecting the metal surface without having to paint it.

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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.