What Are The Stability Of Unsaturated Polyester?

Unsaturated polyester resins and cross-linking monomers also polymerize slowly in the absence of any initiator, thus rendering the resin unusable. Positive monomers, like styrene, often add some negative polymerization agents or retarders to unsaturated polyester resins to prevent resins from polymerizing during storage and transportation, and have certain stability. Generally, 0.01%~0.05% polymerization inhibitor is added in the synthesis process of the resin to prolong the storage period of the molding compound for one week or even two months.
In fact, the stability of unsaturated polyester resins can be divided into three types.
Polymerization Stabilization Used to prevent unwanted products, crosslinking, discoloration or other side reactions during polymerization or dilution.

The stability of the resin product acts as a polymerization inhibitor at low temperature, but it can be removed at a certain molding temperature to make the resin solidify quickly, which requires the polyester resin to have a certain storage period.
The stability of resin curing is under the combined action of initiator, accelerator and polymerization inhibitor, although the resin can obtain the parameters such as gel time and exothermic peak time. However, it is unavoidable that the parameters will drift with the prolongation of the storage time, and a specific stabilizer is required to prevent this change in gel performance.