The curing agents, also called resin hardeners, accelerators, or catalysts, that are added to the resin by the user, have one thing in common. They are either acidic substances by themselves, or they are capable of liberating acid when mixed with the resin. The later class comprises ammonium salts of strong acids. Ammonium salts are more widely used than acids; they are cheap, convenient to handle, and give a high ratio of pot-life to setting time. As hardeners for use at both normal and elevated temperatures the ammonium salts of strong acids are in many respects ideal. They function as hardeners by reacting with the free formaldehyde in the resin, and/or the formaldehyde liberated under the conditions of curing, to give the corresponding acid, hexamethylene tetramine (hexamine) and water. The most commonly used ammonium salt is ammonium chloride, which liberates hydrochloric acid.
4 NH4CL + 6 CH2O ====> 4 HCl + (CH2)6N4 + 6 H2O
See more detail on UF Hardener
Wood adhesive, rubber adhesive, plastic adhesive, remove adhesive, steel adhesive, traditional adhesive, thermosetting resin, water base adhesive, inorganic base adhesive, many glues.
Sunday, February 15, 2009
Popular Posts
-
Urea formaldehyde as wood glue have characteristics such as low cost for hude application, low cure temperature, resistance to microorgani...
-
There are hundreds of adhesive preparations on the market today, supplemented by hundreds of available formulations, which are capable of h...
-
Synthetic rubber , first manufactured in substantial amounts during world war II, was not a replica of natural rubber, but rather, was synth...
-
What is resorcinol adhesives ? Resorcinol alone as the phenolic substance, and with other resin like formaldehyde this substance can unite t...
-
Filler is mixed with adhesive with many purpose like to make an adhesive stronger or make an adhesive more durable. Filler is a substance to...
No comments:
Post a Comment