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The Challenge of Balancing Adhesion and Corrosion Resistance in Waterborne Styrenated Acrylic Direct to Metal (DTM) Resins

Design of waterborne acrylic and styrenated acrylic resins for metal protection requires balancing a multitude of often competing properties. One classic example is attempting to maintain hardness and block resistance while simultaneously reducing the volatile organic content (VOC) demand of waterborne paints. During a recent new product development project, another recurring tradeoff emerged – attempting to deliver a robust adhesion profile while maximizing corrosion resistance. 

Product Number: 51217-034-SG
Author: Allen Bulick, Chirs Le Fever, Glenn Frazee, Kailong Jin, Matt Mellorr
Publication Date: 2017
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Design of waterborne acrylic and styrenated acrylic resins for metal protection requires balancing a multitude of often competing properties. One classic example is attempting to maintain hardness and block resistance while simultaneously reducing the volatile organic content (VOC) demand of waterborne paints. During a recent new product development project, another recurring tradeoff emerged – attempting to deliver a robust adhesion profile while maximizing corrosion resistance. The adhesion/corrosion balance drove an investigation into the fundamental mechanisms by which acrylic polymers both adhere to substrates and inhibit corrosion. Topics such as the role of barrier properties, passivation via adhesion and electrochemical impedance are covered with respect to polymer composition and the role of acid monomers. Applying these learnings, several newly designed polymers are discussed to illustrate the level of corrosion resistance that high performing styrenated acrylics can achieve.

Design of waterborne acrylic and styrenated acrylic resins for metal protection requires balancing a multitude of often competing properties. One classic example is attempting to maintain hardness and block resistance while simultaneously reducing the volatile organic content (VOC) demand of waterborne paints. During a recent new product development project, another recurring tradeoff emerged – attempting to deliver a robust adhesion profile while maximizing corrosion resistance. The adhesion/corrosion balance drove an investigation into the fundamental mechanisms by which acrylic polymers both adhere to substrates and inhibit corrosion. Topics such as the role of barrier properties, passivation via adhesion and electrochemical impedance are covered with respect to polymer composition and the role of acid monomers. Applying these learnings, several newly designed polymers are discussed to illustrate the level of corrosion resistance that high performing styrenated acrylics can achieve.

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