The curing agents for urea formaldehyde resin, also called 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.
More aboout Curing Agent Hardener Urea Formaldehyde
Popular Posts
-
Polyester adhesive can be built into yarn or turn to adhesive product, this adhesive good for gluing many kind of plastics but better if gl...
-
Urea formaldehyde as wood glue have characteristics such as low cost for hude application, low cure temperature, resistance to microorgani... -
Double tape for mounting object on the wall or to stick steel on other steel, see here before you decide to choose the right double tape: 3M... -
We have known that polyester is often use in garment industry to make cloth, but polyester here just to talk about the resin of polyester it...
-
Melamine Formaldehyde Adhesive or Melamine Resin Adhesive A melamine formaldehyde adhesive (also commonly called a melamine glue or an MF)...
No comments:
Post a Comment