There is no unsaturated double bond in the main chain of EPDM rubber, and it is not easy to break, so it has excellent aging resistance such as ozone resistance, ultraviolet resistance, heat resistance, weather resistance, etc. It is widely used in the production of waterproof membranes, with good waterproof effect and use. long life. The use of a small amount of butyl rubber/recycled rubber in EPDM waterproof membrane can extend the service life of products. When EPDM/butyl rubber material is used to produce waterproof membrane, the effect of different vulcanization systems is different, and rubber product manufacturers need to choose a suitable vulcanization system.
1. Commonly used vulcanization system for EPDM/butyl rubber
EPDM rubber is often used in combination with butyl rubber to produce various rubber products. You can choose traditional sulfur vulcanization system, effective vulcanization system, resin vulcanization system, peroxide vulcanization system or quinone vulcanization. The vulcanization efficiency of vulcanized rubber and finished product quality different. When EPDM rubber and butyl rubber are used together to produce waterproof materials, rubber product manufacturers can choose the appropriate vulcanization system for vulcanization according to actual needs.
2. Selection of vulcanization system for pure EPDM waterproof coiled material
When EPDM rubber is used alone to produce waterproof membrane, an effective vulcanization system with low sulfur content is generally selected. The vulcanized rubber has good heat resistance, and even if it is over-sulfur, there will be no problem of vulcanization. In the actual production, the promoter of DM and BZ can be selected as the main accelerator of the vulcanization system in the formulation of the EPDM waterproofing membrane. Among them, the accelerator DM is easily dispersed and non-polluting in the rubber compound, and the vulcanized rubber has excellent aging resistance. ; Accelerator BZ can further improve the aging resistance of vulcanized rubber; use a small amount of accelerator TMTM and accelerator NA-22, of which TMTM belongs to a colorless, non-polluting super accelerator that can activate the vulcanization system and reduce the tendency to scorch.
3. EPDM/butyl waterproof membrane vulcanization system
When using EPDM and butyl rubber in combination to produce waterproof materials, rubber product manufacturers generally use the traditional sulfur vulcanization system, mainly based on accelerator DM and accelerator PZ, and use a small amount of accelerator M. Among them, the accelerator PZ is a super accelerator. It is suitable for butyl rubber, nitrile rubber, and EPDM. It has a large tendency to scorch during use. It needs to be combined with other types of accelerators to coordinate the vulcanization rate and vulcanization degree.
In actual production, the traditional sulfur vulcanization system, effective vulcanization system and resin vulcanization system have slow vulcanization speeds, which is not suitable for large-scale production of waterproof membranes; peroxide 2LLYY63 vulcanizate has good heat resistance, compression resistance and permanent deformation but poor tear strength; Quinones have good vulcanization effect but high cost. Therefore, when EPDM/butyl rubber compound is used in the production of waterproof membranes, sulfur vulcanization is mostly used, super accelerators are used together, and thiazole accelerators are used as auxiliary accelerators to coordinate the relationship between vulcanization rate and vulcanized rubber varieties.
The waterproof roll material produced by using EPDM rubber and a small amount of butyl rubber is light in material, high in tensile strength, large in elongation, excellent in weather resistance and aging resistance. Rubber product manufacturers can also use EPDM/butyl rubber Substitute a small amount of reclaimed rubber, for example, EPDM reclaimed rubber to replace part of the EPDM raw rubber, appropriately adjust the type and dosage of the compounding agent in the vulcanization system, reduce the cost of raw materials and further optimize the quality of waterproof membrane.