Enhancing formulation performance
Huntsman is leveraging its core competencies in synthesis and formulation to add new and innovative high performance materials to its range of proven and qualified building blocks in the drive to enable market differentiation for formulators in the areas of adhesives and composites, focused on the delivery of mechanical and thermal performance improvement.
Examples of how Huntsman is working to deliver enhanced formulation performance are as follows:
Resins and hardeners:
- TGMAP type Araldite® MY0610 offers very high mechanical and thermal properties. In comparison to TGMDA resins (eg. Araldite® MY 721), higher modulus can be achieved with similar thermal resistance. (graph 1)
- Tri-functional, TGHPM type epoxy resin Tactix® 742 provides higher glass transition temperature resistance than any other resin.
- Dycyclopentadiene based, novolac epoxy Tactix® 556 presents the lowest moisture absorption among any other epoxy resin. (graph 2)
- Diaminodiphenylsulfone hardener Aradur® 976 offers thermal resistance and stability, as well as chemical resistance.
Tougheners and flexibilizers:
- Specially modified epoxy/rubber adduct Araldite® LY 1146 improves impact resistance, adhesion on contaminated surfaces and corrosion resistance.
- Working at higher temperature than epoxy/rubber adducts, Flexibilizer DY 965 provides outstanding impact resistance and adhesion to metal. (graph 3)
- Araldite® Benzoxazine resins, such as Araldite® MT35600 are a novel class of thermosets, exhibiting extremely good thermal and mechanical properties
- Kerimid® and Matrimid® Polyimide resins are arange of polyimide and bismaleimide resins suitable for long term resistance above 200°C.
Reducing formulation costs
While reducing the cost of formulations can be achieved through the careful selection of raw materials, the manufacturing process is also pivotal to the delivery of sustainable solutions. Reducing the number of mixing or synthesis operations, lowering production time through easier incorporation and reducing the investment in manufacturing equipment are all examples of the factors that strongly influence the final cost of a formulation.
With access to a number of complementary global production facilities the company offers unique, off-the-shelf or customised, high quality and cost effective products and services for formulators within blends (of resins or hardeners), master-batches, as well as pre-adducted chemicals.
Blends of liquid bisphenol A based epoxy resins with reactive diluents, such as Araldite® BY 158 or Araldite® BY 157, or blends of solid bisphenol A epoxy resins and epoxy novolac resins such as Araldite® GT 7220 illustrate the wide offering of Araldite® Blends.
Similarly, the company’s Araldite® and Aradur® master batch concentrates can be diluted into final formulations to provide high quality homogeneous dispersions. Examples of this are Aradur® 1571, a viscous dispersion of solid latent hardener into liquid epoxy resin or the Araldite® DW series of concentrated coloured epoxy pastes. (graph 4)
Also, Araldite® or Aradur® adducts allow easier introduction into formulations or are used to provide better control for several properties or behaviour such as the polymerisation time.
One of the main characteristics of any type of formulation is its ability to be processed in an easy, efficient and cost effective way. Rheology and curing kinetics are among the most important influencing parameters:
Formulators are often looking to achieve the lowest final viscosity or for low viscosity building blocks that allow introduction into the formulation of larger amounts of other components without negative influence on the processability.
Gaining control over curing kinetics is essential for determining whether a formulation is suitable for the intended application and process.
To help formulators to develop their formulated systems with ease, Huntsman provides low to very low viscosity building blocks: from mono or multifunctional reactive diluents such as Araldite® DY-E or Araldite® DY-T, to high purity distilled resins such as Araldite® PY 306, Araldite® GY 285 or Araldite® MY790 (bis-phenol A or F based resins) or the trifunctional and structural resins Araldite® MY 0510 and Araldite® MY 0610. (graph 5)
For adjusting the curing profile, Huntsman also provides several chemical families of hardeners and accelerators. For low to medium thermal resistance applications polyamidoamine hardeners allow gel times at room temperature from 60 minutes (Aradur® 250) to more than 15 hours (Aradur® 100). For medium to high thermal and structural applications, amine based formulated hardeners offer gel times from 5 minutes (Aradur® 2992) to more than 15 hours (Aradur® 3489). Solid latent hardeners and accelerators, take Aradur® 3123 imidazole for example, provide long latency in combination with high thermal and mechanical performances. (graph 6)
Limiting toxic substances
The European Union, government and company policies concerning the toxicity of chemicals are becoming more stringent. REACH, the European Community Regulation on chemicals provides a good illustration of this: Companies must register each chemical substance they wish to sell in Europe, and REACH also calls for the substitution of the most dangerous chemicals wherever suitable alternatives are available.
In backing the initiative, Huntsman supports chemical formulators by initiating the registration all of the substances present in its various ranges. Huntsman is also committed to support customers in any kind issues they can face in term of regulation of chemicals.
The company has also decided to withdraw, wherever technically possible, the toxic substances from its ranges of components. For example, Aradur® 43-1 and Aradur® 46-1 are new Bisphenol A-free hardeners. In Rhodeftal® 210 polyamide-imide resin, NMP solvent has also been substituted as has nonylphenol in hardeners such as Aradur® 15-1 or Aradur® 3275.
The key to success in helping the formulators of adhesive or composite solutions to achieve market differentiation is based on producing speciality chemical building blocks that meet customer’s expectations. To achieve this, Huntsman remains focused on its four-pronged approach based on performance enhancement, cost reduction, formulation processing optimisation and limitation of toxic substances.
More information: www.huntsman.com