The two-component addition molding potting adhesive can be divided into elastic silicone gel and silicone rubber. The former has lower strength, while the latter has higher strength. Their vulcanization mechanism is based on the addition reaction (hydrosilylation reaction) between the ethylene (or propylene) groups on the end groups of organic silicone rubber and the silicon hydrogen groups on the crosslinking agent molecules.

In this reaction, polydimethylsiloxane containing hydride functional groups is used as a crosslinking agent, and chloroplatinic acid or other soluble platinum compounds are used as catalysts.

The sulfurization reaction is carried out at room temperature or under heating conditions. Do not release by-products. Due to the absence of low molecular weight compounds during crosslinking, addition molded silicone rubber does not undergo shrinkage during vulcanization. This type of vulcanized rubber is non-toxic, has high mechanical strength, excellent resistance to hydrolysis stability (even under high-pressure steam), good low-pressure shrinkage deformation, low flammability, can be deeply vulcanized, and the vulcanization speed can be controlled by temperature. Therefore, it is a type of silicone rubber that is currently being vigorously developed both domestically and internationally.

The packaging method of additive sealing adhesive is generally divided into two components: A and B: catalyst and organic silicon polymer containing vinyl functional groups as one component; Hydrogen containing polysiloxane crosslinking agent as another component. The mixing ratio is generally carried out at A: B=1:1, and the ambient temperature has a certain impact on the applicable period of the mixed operation. When the ambient temperature is high, the reaction speed is faster and the applicable period of operation is shortened.

About two-component addition molding potting adhesive,please check the details: IOTA Silicone Encapsulating Rubber 13 series (Addition Cured)