When the initiator is selected, the characteristics of the initiator must first be matched with the reactivity of the resin. The resin for room temperature molding must be formulated with an initiator which has a high activity and can undergo a redox reaction with a promoter to generate a radical. There are many types of resins for thermoforming, and there are many types of initiators available. For a resin, it may be difficult to use benzoyl peroxide. It is better to use the same half-life of tert-butyl peroctoate, so it is tested and carefully compared. In general, the reactivity of the resin requires the use of a lower activity initiator to avoid excessive radical generation, which is not fully effective in the curing process of the resin, and lacks an initiator in the later stage.
Resin manufacturers generally recommend the appropriate range of initiators and dosage ranges for each resin they produce. It is described separately in the following chapters and in the next chapter.
Resin storage period
The storage period and storage period of the resin are two concepts with different meanings. The storage period refers to the expiration date of the resin product that can be stored in the warehouse and in transit, which is generally about 6 months. In the case of storage, no initiator can be added to the resin. The storage period refers to an effective period of time during which the resin user can process the product from the start of the processing initiator to the time when the resin starts to lose fluidity. This storage effective time can also be called the applicable life, which is required by the processing technology and must be met. Therefore, it is also the main factor for selecting the initiator.Back