Preparation and properties of ultraviolet curing sulfur containing sealant

Abstract

The Thiol-ene click reaction was used to prepare photoinitiated radical curing sealants based on polythioether rubber. The effect of types and amount of photoinitiators in the curing system, as well as the types of olefins and polythiols on the mechanical properties of the sealant after vulcanization, temperature of thermal decomposition, and glass transition temperature were studied. The results showed that compared with photoinitiator 184, the cu-ring effect and thermal stability of the cured sealant were better when using photoinitiator 1173, and the mechanical properties and thermal stability of the sealant decreased with increasing amount of photoinitiator. And the appropriate amount of photoinitiator 1173 was 0.03 phr（mass, the same below）. The mechanical properties of polythioether sealant cured with tripropylene glycol diacrylate （TPGDA） as curing agent were the best, and the mechanical properties and thermal stability of the sealant increased with increasing amount of TPGDA. And the appropriate amount of TPGDA was 1.00 phr. The addition of multifunctional mercaptan could improve the crosslinking degree of the sealant and also make the glass transition temperature increased.

Keywords

• liquid polythioether rubber
• ultraviolet curing
• sulfur containing sealant
• photoinitiator
• curing agent
• mechanical property