Analysis of Neutral Room Temperature Vulcanizing Silicone Rubber Formulation
Analysis of Neutral Room Temperature Vulcanizing Silicone Rubber Formulation
Analysis of Neutral Room Temperature Vulcanizing Silicone Rubber Formulation
The formulation of neutral room temperature vulcanizing silicone rubber mainly includes the following components and their functions:
1. Hydroxyl-terminated polydimethylsiloxane: As the main component, it provides the basic properties of the silicone rubber.
2. Methyl tributanone oxime silane: As a crosslinking agent, it promotes the curing reaction of the silicone rubber.
3. Fumed silica: As a reinforcing filler, it improves the mechanical strength and wear resistance of the silicone rubber.
4. Calcium carbonate: Increases the hardness and stability of the silicone rubber.
5. Silane coupling agent: Such as SF-S550, it enhances the bonding force between the filler and the silicone rubber matrix.
6. Dibutyltin dilaurate: As a catalyst, it accelerates the curing reaction.
7. Dyes: Used to adjust the color of the silicone rubber. Specific Formula Examples:
• Single-component oxime-type room temperature RTV silicone rubber formula:
o Hydroxyl-terminated polydimethylsiloxane: 100 parts
o 201 silicone oil: 32 parts
o Methyl tributanone oxime silane: 7-9 parts
o Fumed silica: 8 parts
o Calcium carbonate: 45-55 parts
o Silane coupling agent SF-S550: 2 parts
o Dibutyltin dilaurate: trace amount
o Dye: appropriate amount
• Two-component room temperature RTV silicone rubber formula:
o Component A:
Hydroxyl-terminated polydimethylsiloxane: 100 parts
Ultrafine calcium carbonate: 40-50 parts
Fumed silica: 9-10 parts
Titanium dioxide: 5 parts
o Component B:
Ethyl orthosilicate: 7-8 parts
n-Butyl borate: 3-4 parts
n-Butyl titanate: 3-4 parts
Dibutyltin dilaurate: trace amount
Preparation Method: Mix each component according to the formula ratio to prepare a mixed compound through mixing or compounding processes, and then carry out a vulcanization reaction at room temperature to form an elastic vulcanized rubber.
Application Fields: Neutral room temperature vulcanizing silicone rubber is widely used in electronics, light industry, machinery, construction, chemical industry and other industries as adhesive, sealant, insulation, moisture-proof, and shock-absorbing materials, and is particularly suitable for waterproofing, sealing, and potting of electronic components, semiconductor materials, electric heaters, and electronic instruments.