{"id":18708,"date":"2025-01-29T06:00:39","date_gmt":"2025-01-29T12:00:39","guid":{"rendered":"https:\/\/www.ulprospector.com\/knowledge\/?p=18708"},"modified":"2025-01-29T07:45:25","modified_gmt":"2025-01-29T13:45:25","slug":"pc-hydroxy-acrylic-resin-a-resin-by-any-other-name","status":"publish","type":"post","link":"https:\/\/ulprospector.ul.com\/18708\/pc-hydroxy-acrylic-resin-a-resin-by-any-other-name\/","title":{"rendered":"Hydroxy Acrylic Resin (A resin by any other name)"},"content":{"rendered":"

\"\"The topic is hydroxy acrylic resins<\/a>, which is the general term for several different types of resins and methods to cross-link them. For the most part, I will assume that it was meant to be focused more on resins that are supplied in water and solvents as a 2-component (Non isocyanate) NISO system, but also could be a 2-component resin system that can be cross-linked that would conventionally contain an isocyanate cross-linker.<\/p>\n

Hydroxyl functional acrylic resins<\/a> are a type of acrylic resin that has hydroxyl groups on its molecular structure. These hydroxyl groups make it water-soluble and compatible with a variety of other materials, making it a versatile resin with many applications in industrial and automotive coatings. It can also be supplied as a solvent compatible system.<\/p>\n

In industrial coatings<\/a>, hydroxyl functional acrylic resins are used in primers, topcoats, and corrosion protection coatings. They provide excellent adhesion to a variety of surfaces, making it a good choice for these applications. Hydroxyl functional acrylic resin is also resistant to weathering, chemicals, and abrasion as well as resistant to chipping, scratching, and fading, making it a good choice for topcoats and clear coats.<\/p>\n

Non-NISO resins are easiest to explain by functionality. Reactive groups\u00a0contain hydroxy functions which can react with isocyanates or melamines. Some contain glycidyl functions (epoxy group) that will react with amines and carboxylic acids. These groups allow bonding between polymer chains to form a stronger polymeric material. Because they are functional in almost all cases the reacted polymer would have superior properties to non functional, non crosslinked. In almost all cases these are industrial resins due to cost and functionality.<\/p>\n

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They influence resin properties, applications, and final properties of the film\/coating obtained. -OH functionalization and the presence of carboxyl groups can improve the\u00a0adhesion on a substrate. A large number of carboxyl groups will also help to solubilize the resin in water. To get a resin with specific properties or to reduce its cost, different monomers can be incorporated into the acrylic polymer. Several resins are highlighted in this article; (does not imply or infer a preference. As example) the first being Hypomer MT-2550K<\/a>[1]<\/sup><\/a>. It is an Elementis hydroxy acrylic matting resin for non aqueous industrial and automotive coating systems. Another group of hydroxy functional acrylic resin is offered by Dianal. There are three series of varying hydroxyl levels[2]<\/a>. A last one is Synaqua\u00ae E21219<\/a>, a waterborne NISO (N<\/strong>on iso<\/strong>cyanate) from Arkema[3]<\/a><\/p>\n

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Acrylic resins can be accessible as self-crosslinking versions (rather solvent-based or water-based). Some -R groups in the copolymer structure are blocked amide (alkoxymethyl acrylamides) groups. For example, N,N-bis-butoxy-methylamide. During the curing process, they bond with the hydroxyl groups available on the copolymers leading to a cross-linked network. The curing is an oven-bake at elevated temperatures.<\/p>\n

Compared to resins, crosslinked resins with curing agents, self-crosslinked resins have:<\/p>\n