Resin is the second major component of a composite that acts as a matrix. Resins are any type of polymer that is used as a matrix or continuous phase of a composite.
The role of resins in composites:
Keeping the fibers together
Transfer of stress to fibers
Protecting fibers from environmental factors (such as moisture)
Fiber surface protection from abrasion
Resins play a key role in some composite properties such as strength and transverse modulus, shear properties and compressive properties, but play little role in tensile strength.
Types of polymer substrates (polymer matrices):
Thermostat (hard heat):
Polyester, vinyl ester, epoxy, phenolic, novalak epoxy, polyimide, silicon, urea, melamine formaldehyde, which are the most important industries related to composites (fiberglass) are unsaturated polyesters and epoxies.
Thermoplasty (soft heat):
Polypropylene, polyethylene, nylons, saturated polyesters (such as polyethylene terephthalate PET), polybutylene terephthalate (PBT), polycarbonate, polystyrene and…
Shelf life or Storage time:
The time interval between the production of a resin and when it can be used safely is called the storage time.
After the resin was combined with the accelerator and then the catalyst; It takes a while for the resin to take on a gel state. It is called Gel Time. It is after this time that the temperature of the resin begins to rise rapidly.
The resin lattice reaction begins shortly after the resin is mixed with the catalyst and accelerator, resulting in an increase in the viscosity of the system (the resin with the catalyst and accelerator is called the system). The rate of increase in viscosity will vary depending on the amount of catalyst, accelerator, inhibitor, ambient temperature, amount of material and other additives. The time after mixing the resin with the catalyst and accelerator until the resin can no longer be used; The useful life of the system or storage time is called the Pot Life. This feature is very important and you must have full knowledge before using it.
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