The catalytic debinding is a new degreasing process developed in recent years, which is also called Metamold Degreasing Process. Its working principle is that the organic carrier molecules are broken down into smaller and volatile molecules by using catalysts. 

 

Compared with other organic carriers in degreasing process, these molecules have higher vapor pressure and can rapidly diffuse into the green body.The binder system used in Catalytic Debinding Process is usually composed of a polyacetal resin, which acts as a framework for the polymer and a stabilizing additive. At present, Catalytic debinding has been applied in the field of cemented carbide injection molding. 

 

Some polymers that can degrade rapidly in particular atmosphere are used as the main binder. Therefore, the injection of Green Catalytic Debinding occurred in the corresponding atmosphere. Main binder was quickly decomposed and removed, while the auxiliary binder is not sensitive to the catalytic atmosphere remained in the green body, play a supporting role. Under acid steam catalysis, the depolymerization reaction of aldehydes is usually carried out between 110 and 150 ℃ centigrade, and the reaction product is gaseous formaldehyde monomer. Reaction process is as follows.

 

 

Characteristic: the catalytic reaction temperature is lower than the softening temperature of the main binder. Liquid phase will not be produced during the whole degreasing process, thus avoiding the generation of deformation, collapse and other degreasing defects. 

 

Therefore, catalytic degreasing combines the advantages of thermal debinding and solvent degreasing, overcomes the shortcomings of the traditional degreasing methods, such as long time, many defects, high energy consumption and pollution of the environment. Moreover, the diffusion of gas is confined to the porous shell which has formed, and no pressure is formed inside the body.