With Huntsman’s Araldite® benzoxazine resins, customers are producing stronger, lighter-weight composite parts than ever before. Next-generation benzoxazines combine excellent stiffness and high-temperature performance with the ability to withstand exposure to moisture, chemicals and other corrosive materials. The new products are ideal for use in extreme environments and offer low flammability. In addition, several of these systems are designed to cure out of autoclave.
Today’s generation of benzoxazine resins are safer and easier to handle and process. Huntsman has formulated diluents and accelerators that reduce viscosities, as well as cure temperature and cycle times. Moreover, Huntsman’s benzoxazine products release approximately 20% less energy1 during cure and do not generate volatiles2 during cure. The products are storage stable at room temperature.
1. When compared to traditional epoxy resins
2. When compared to phenolics
Benzoxazine resins vs. traditional resin chemistries
For challenging applications, Huntsman’s Araldite® benzoxazine resins are an ideal alternative to conventional epoxy, phenolic and BMI resin systems.
Epoxy: Benzoxazine resins are 50% stiffer than traditional epoxies with flexural moduli in the 4,500 – 5,300 MPa range. The hot/wet performance of the new resins is also better than that of epoxy materials. The benzoxazines also offer lower shrinkage during cure.
Phenolic: Benzoxazine resins produce higher part accuracy with less micro-cracking than phenolic resins and do not generate volatiles during cure – which means higher-quality laminates with reduced chance of voids.
Bismaleimide: While bismalemides (BMIs) currently offer the highest Tgs, they require longer processing times and an autoclave cure, resulting in higher manufacturing costs than benzoxazine resins.