The influence of the polymerization inhibitor on the performance of the resin, in addition to its certain strength and flexibility after curing, mainly affects the curing process parameters of the resin. The exothermic peak temperature of the resin and the time of curing (i.e. to the exothermic peak time ) To a considerable extent depends on the variety and quantity of polymerization inhibitors contained.
For a specific resin, the amount of heat released during curing is constant, but the time and speed of this heat release can be adjusted by the type and amount of polymerization inhibitor. Therefore, by selecting the type and amount of polymerization inhibitor, you can make The resin meets the requirements of various curing conditions. The exothermic peak temperature can be changed from 88℃ to 232℃, and the gel time can be extended from 2min to 25~30min at 82℃. Commonly used polymerization inhibitors are as follows.
(1) Hydroquinone Hydroquinone is a commonly used polymerization inhibitor with a concentration of 0.005% to 0.01% of the total mass of the resin. If the amount is large, the exothermic peak will decrease, the resin will turn yellow, and the surface state will be poor. Poor aging performance.
(2) Benzoquinone Benzoquinone can prevent the resin from gelling within the gel time, and it is often added before the resin is sold or when it is about to be used.It cannot prevent the gel from being stored for a long time. .For long-term storage and transportation, hydroquinone should be added.
(3) P-tert-butylcatechol P-tert-butylcatechol can be used for resin storage at room temperature, and its stability decreases after heating up.
(4) The quaternary ammonium salt (such as trimethyl ammonium chloride) can obtain good flame retardant resin. The quaternary ammonium salt can play the dual role of stabilizer and accelerator. It can be used in combination with cobalt accelerator It acts as an auxiliary accelerator, and at the same time it is a stabilizer to prevent the drift of the gel time. It has a certain effect on the curing time.