Benzoxazine Resins & Accelerators

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.

 


Benzoxazine Resins

Product Viscosity at 125ºC [cP] Melting Point
[ºC]
Gel Time at 220ºC [sec.] Product Description
Araldite MT 35610 200 – 600 58 – 70 160 – 450 Bisphenol-A based benzoxazine thermosetting resin which can be homopolymerized or co-reacted with an epoxy or a phenol novolac resin resulting in polymers with high temperature resistance, high modulus, low water absorption and high dimension stability.
Araldite MT 35700 1000 – 7,000 55 – 65 200 – 450 Bisphenol-F based benzoxazine thermoset resin which can be homopolymerized or co-react with an epoxy or phenol resin resulting in polymers with high temperature resistance, good flammability resistance (UL94 V1), high modulus, low water absorption and dimension stability.
Araldite MT 35710 FST 30 – 100 at 100ºC N/A 300 – 450 Thermosetting benzoxazine resin designed for transportation interior or other composite applications where low flammability is required. As with other benzoxazine resins no volatiles are being released during curing.
Araldite MT 35910 100 – 500 at 110ºC N/A 150 – 300 Epoxy modified thiodephenol based benzoxazine designed for composite applications requiring high thermal resistance properties and moisture resistance.

Benzoxazine Modifiers

Product Appearance Melting Point
[ºC]
Acid Value
[mgKOH/g]
Product Description
Araldite MT 35500 100 – 200 at 25ºC N/A 90 – 150 Low viscosity liquid benzoxazine resin suitable for the viscosity reduction of benzoxazine or epoxy resins. Excellent thermal properties and moisture resistance.
Accelerator DT 300 White crystals 154 – 156 n/a Effective for homo-polymerization of benzoxazines and epoxy/benzoxazine formulations. It can be used to lower the temperature of cure and allows for shorter cure time.
Accelerator DT 310 White crystals 127 – 134 600 – 650 Effective for homopolymerization or benzoxazine formulations. Allows curing at lower temperatures and it can be used to lower the temperature of cure

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