Preparation of agent for stabilizing aqueous solution of formaldehyde

TLDR: In this article, the authors proposed a method to produce a titled stabilizing agent, exhibiting remarkable stabilizing effect at an extremely low dose, easily by polymerizing vinyl acetate monomer, and partially formalizing the resultant polyvinyl acetate.

Abstract: PURPOSE: To produce the titled stabilizing agent, exhibiting remarkable stabilizing effect at an extremely low dose, easily, by polymerizing vinyl acetate monomer, and partially formalizing the resultant polyvinyl acetate. CONSTITUTION: Vinyl acetate monomer is polymerized in a solvent composed mainly of isopropyl alcohol, in the precence of a polymerization initiator such as azobisisobutyronitrile, etc. An aqueous solution of HCHO and HCl or H 2 SO 4 are added as the formalizing agent to the solution of the resultant polyvinyl alcohol, and heated usually at 60W80°C to effect the formalizing reaction. The objective stabilizing agent can be produced by stopping the formalizing reaction when clouding takes places by dripping the reaction product to a CH 3 OH mixture having a volume ratio (CH 3 OH/H 2 O) of 55:45W75:25, at 20W25°C. USE: It can be used effectively for the stabilization of concentrated HCHO aqueous solution used in the production of amino resin, phenolic resin, etc. in storage or transportation. COPYRIGHT: (C)1986,JPO&Japio