Two-component addition molding room temperature vulcanized silicone rubber


The base glue for the addition of a liquid silicone rubber is mainly a polydiorganosiloxane containing two or more vinyl groups.


1 principle
Two-component addition molding room temperature vulcanized silicone rubber is distinguished by elastic silicone gel (lower strength) and silicone rubber (higher strength). Their vulcanization mechanism is based on the addition reaction (hydrosilylation reaction) of the vinyl (or propylene group) on the silicone gum end group and the hydrosilyl group on the chain extender molecule. In this reaction, by-products are not released. Since the low molecular weight is not released during the interlacing process, the addition of the room temperature vulcanized silicone rubber does not cause shrinkage during the vulcanization process.


2 performance
This type of vulcanizate is non-toxic, has high mechanical strength, excellent hydrolysis stability (even under high pressure steam), good low compression set, low flammability, deep vulcanization, and vulcanization rate can be controlled by temperature. The advantage is therefore a kind of silicone rubber which is vigorously developed at home and abroad.


Addition molding room temperature vulcanized silicone rubber


1 packaging method
The packaging method is generally divided into two components: A and B: the catalyst is used as a component; the cross-linking agent is used as another component.


2 performance
High-strength, addition-formed room temperature vulcanized silicone rubber is an excellent material for molding because of its low line shrinkage and low molecular weight during vulcanization.


3 uses
It has been widely used in the mechanical industry to mold epoxy resin, polyester resin, polyurethane, polystyrene, vinyl, paraffin, low melting point alloy, coagulation and the like. Curing with addition molding


2 high temperature vulcanized silicone rubber (RTV)
1 high temperature resistant rubber hose
2 high temperature resistant liquid silicone RTV


1 principle
High-temperature vulcanized silicone rubber is a high molecular weight (generally 40-800,000) polyorganosiloxane (ie, raw rubber) added to reinforcing fillers and other various additives, using organic peroxide as a vulcanizing agent, and pressure molded (molding, extrusion, calendering) or injection molding, and cross-linking into rubber at high temperatures. This rubber is generally referred to as silicone rubber.


2 performance
Silicone rubber reinforcing fillers are various types of silica, which can increase the strength of vulcanized rubber by a factor of ten. The addition of various additives mainly reduces the cost of the glue, improves the properties of the rubber compound, and imparts various special properties such as flame retardancy and electrical conductivity to the vulcanizate.