Dealcoholized one-component room temperature vulcanization (RTV-1) silicone rubber is a commonly used bonding and sealing material. The main components are hydroxyl-terminated polydimethylsiloxane, fillers, reinforcing agents, cross-linking agents, Catalyst; the finished product can be vulcanized into elastomer by contact with air at room temperature. RTV-1 silicone rubber has the characteristics of low vulcanization temperature, fast vulcanization speed, easy operation, no heat absorption and no heat release during vulcanization, good adhesion to a variety of metals and non-metals, etc. High and low temperature resistance, air permeability, electrical insulation and chemical stability, as well as aging resistance, flame resistance, humidity and salt spray resistance; therefore, it is used in aviation, aerospace, electrical, electronics, chemical, instrumentation, automotive, machinery and medical Health, daily life and other fields are widely used.
  In the development of aerospace electronic products, a large amount of dealcoholized RTV-1 silicone rubber is used as anti-vibration reinforcement materials for components and wires. Although the construction is convenient and the operation is simple, the vulcanization time is longer, which has a considerable impact on the product development cycle. Therefore, it is necessary to study the influencing factors of its vulcanization speed in order to shorten the vulcanization time and improve the vulcanization efficiency.
    Through research, the factors affecting the vulcanization performance of dealcoholized RTV-1 silicone rubber mainly include vulcanization depth, relative humidity, and surface drying time. The following relationships exist between them.
      For dealcoholic RTV-1 silicone rubber, with the extension of the vulcanization time, the vulcanization depth of the rubber layer deepens, but the vulcanization time is not directly proportional to the vulcanization depth, but the deeper the vulcanization, the required vulcanization time doubles; At the same time, with the same adhesive layer thickness, as the relative humidity increases, the vulcanization time will be significantly shortened; and, as the vulcanization temperature increases, the surface drying time and vulcanization time will be correspondingly shortened; therefore, increasing the humidity and temperature It can shorten the curing time and deepen the curing depth of dealcoholized RTV-1 silicone rubber.
However, increasing relative humidity and temperature does not solve the problem once and for all. Basically, it is necessary to adjust the vulcanization performance of RTV-1 silicone rubber from the formula. Of course, this has always been a high-end topic in the industry.