Ad
related to: silicone rubber curing process definition chemistry
Search results
Results From The WOW.Com Content Network
In its uncured state, silicone rubber is a highly adhesive gel or liquid. To convert it to a solid, it must be cured, vulcanized, or catalyzed. This is normally carried out in a two-stage process at the point of manufacture into the desired shape, and then in a prolonged post-cure process. It can also be injection molded or 3D printed.
The curing process begins on the outer surface and progresses through to its core. The product is packed in airtight cartridges and is either in a fluid or paste form. RTV-1 silicone has good adhesion, elasticity, and durability characteristics. The Shore hardness can be varied between 18 and 60. Elongation at break can range from 150% up to 700%.
Curing is a chemical process employed in polymer chemistry and process engineering that produces the toughening or hardening of a polymer material by cross-linking of polymer chains. [1] Even if it is strongly associated with the production of thermosetting polymers , the term "curing" can be used for all the processes where a solid product is ...
Two-part silicones use moisture in the second component as well as a cross-linker such as active alkoxy to cure the silicone in a process called condensation curing. Two-part silicones can also be platinum catalyzed in a "addition" reaction. [3] Other reactive species to facilitate cross-linking include acetoxy, amine, octoate, and ketoxime. [4]
Curing results in chemical reactions that create extensive cross-linking between polymer chains to produce an infusible and insoluble polymer network. The starting material for making thermosets is usually malleable or liquid prior to curing, and is often designed to be molded into the final shape. It may also be used as an adhesive.
Silicone caulk can be used as a basic sealant against water and air penetration. In organosilicon and polymer chemistry, a silicone or polysiloxane is a polymer composed of repeating units of siloxane (−O−R 2 Si−O−SiR 2 −, where R = organic group). They are typically colorless oils or rubber-like substances. Silicones are used in ...
Injection molding of liquid silicone rubber (LSR) is a process to produce pliable, durable parts in high volume.. Liquid silicone rubber is a high purity platinum cured silicone with low compression set, good stability and ability to resist extreme temperatures of heat and cold ideally suitable for production of parts, where high quality is required.
The products cure from a liquid or gel state to a solid elastomer. Curing entails crosslinking by the hydrolysis of silyl ethers: 2 RSi(OCH 3) 2 R' + H 2 O → [RSi(OCH 3)R'] 2 O + 2 CH 3 OH. In a hydrolysis reaction, a catalyst and moisture is required to form an intermediate silanol, which then reacts to form siloxane linkages in a ...