Materials Performance

SEP 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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Ashland Derakane ™ Signia ™ Resins—Unchanged Polymer Backbone Introduced in 1965 to combat corrosion in hot, wet chlorine environments, Derakane ™ epoxy vinyl ester resins have become the industry standard for corrosion-resistant fiber reinforced polymer (FRP) equipment. New derivatives have been introduced over the years to allow for expanded chemical environments, high temperature performance, and areas requiring improved toughness. Derakane ™ Signia ™ resins leverage new production capabilities to modernize resin features: In the shop • Low styrene emission • Improved worker satisfaction • Improved shop efficiency • Better workability • Longer shelf life In the field • Unchanged polymer backbone • Identifiable resin system Signia ™ resins provide resistance to a wide range of acids, alkalis, bleaches, and organic compounds used in industrial chemical applications. Assurance of corrosion performance is critical to users and specifiers of FRP equipment. Ashland knows through direct chemical structure evaluation the Derakane ™ Signia ™ polymer backbone is unchanged compared to previous ver- sions of Derakane ™ . The challenge is to demonstrate this to the industry without revealing proprietary information. Liquid and thermo-mechanical properties of Derakane ™ Signia ™ 411, Derakane ™ 411-350, and Derakane ™ Momen- tum ™ 411-350 were compared and found to be the same. A review of published safety data and technical data sheets demonstrates this; contact for documents. Tensile and flexural strength, modulus, and heat distortion temperature properties measure directly the character of the cured polymer matrix crosslinking. If there was a difference in polymer chain construction for these res- ins, significant variations in properties would be seen. To confirm corrosion performance, two aggressive chemical environments were chosen for evaluation of Signia ™ resins versus the classic Derakane ™ 411 type epoxy vinyl ester resin—consistent performance in these environments is critical and is a key indicator of an unchanged backbone. 5200 Blazer Pkwy. Dublin, OH 43017, USA Email: Figure 1. ASTM C-581 corrosion study data for 32% hydrochlo- ric acid (HCl) at 66 °C (left) and 10% sodium hydroxide (NaOH) at 93 °C (right). In Figure 1, the retention of C581 coupon modulus after exposure to 32% HCl at 66 °C (150 °F) and to 10% NaOH at 93 °C (200 °F) is presented. Laminate modulus is mainly determined by the reinforcement. The retention of modulus relates directly to degradation of glass reinforcement and the resins' ability to protect the glass from chemical attack. Derakane ™ Signia ™ and the classic Derakane ™ backbone show similar performance—considering variations inherent to C581 testing. Summary The chemistry of epoxy vinyl ester resins makes them highly reactive and when first invented they were unstable and difficult to use because of this. Introduction of better production capabilities improved their stability and allowed them to become a material of choice for corrosion applica- tions where alloys cannot perform. With Derakane ™ Signia ™ resins, Ashland has combined the best technological fea- tures of the Derakane ™ and Hetron ™ lineage with additional new learnings to introduce a leap forward in stability and usability compared to previous generations of epoxy vinyl ester resins. Liquid, thermo-mechanical, and corrosion per- formance data discussed in this article support that Signia ™ resins have an unchanged polymer backbone—assuring customers the vast library of Derakane ™ corrosion and case history data collected over the past 50 plus years applies to Signia ™ resins. W W W.MATERIALSPERFORMANCE.COM SEPTEMBER 2018 A10

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