{"id":3281,"date":"2015-10-23T08:00:53","date_gmt":"2015-10-23T14:00:53","guid":{"rendered":"https:\/\/www.ulprospector.com\/knowledge\/?p=3281"},"modified":"2018-07-11T13:13:57","modified_gmt":"2018-07-11T19:13:57","slug":"pc-industrial-coatings-resins-polyurethanes-part-2","status":"publish","type":"post","link":"https:\/\/ulprospector.ul.com\/3281\/pc-industrial-coatings-resins-polyurethanes-part-2\/","title":{"rendered":"Industrial Coatings Resins – Polyurethanes, Part 2"},"content":{"rendered":"

\"polyurethantpiechart2\"
Figure 1 \u2013 Uses of Polyurethanes [1]<\/figcaption><\/figure>Polyurethanes<\/a> are versatile polymers with a broad range of applications across many industries. In part one<\/a> of this series, I discussed the chemistry of isocyanates \/ polyisocyanates and polyols. Here, I\u2019ll further explore the uses of polyurethanes in coatings and adhesives and sealants. I\u2019ll also touch on polyurethane elastomers and thermoplastic polyurethanes.
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\nPolyurethane Coatings <\/strong><\/p>\n

Polyurethane coatings are applied to products to improve their appearance and provide protection from environmental conditions, such as sunlight UV, abrasion, rain and airborne contaminants and particulates. Combined with a quality pretreatment for metals, a formidable coating system provides many years of corrosion-free protection. On automobiles, polyurethane coatings provide the exterior a high gloss and color retention, while contributing to scratch and corrosion-resistance. In aerospace applications, the coatings also provide a high-gloss finish and low surface energy and help protect the skin of the plane from rust and pitting over extreme temperature differences\u2014from intense summer heat to below-freezing at cruising altitudes.<\/p>\n

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A special class of polyurethane coatings incorporates fluorine<\/a> into the polyol<\/a>. These resins, which are sometimes called \u201cfluorourethanes,\u201d generally provide even higher performance than non-fluorinated urethanes, and find use in extremely harsh environments such as pipe linings, offshore marine platforms and chemical plants. Companies that provide these polymeric materials include Asahi Glass (AGC) under the tradename Lumiflon\u00ae, Daikin Industries\u2019 Zeffle\u2122, and Arkema\u2019s Kynar\u00ae.<\/p>\n

Other types of polyurethane coatings are used in construction in diverse applications for: steel trusses and concrete supports for bridges, Floating Production Storage and Offloading (FPSO) vessels and oil platforms. In the energy sector, they find use on wind turbine towers, blades and nacelles, and for the protection of the backsheet for solar panels. Coatings are typically thought of as an application of a wet material to a substrate, but may also refer to a film. Films are finding greater uses in aerospace, solar, and transportation, as they don\u2019t require a window of application and cure for field uses as do liquid coatings.<\/p>\n

Polyurethane Adhesives and Sealants <\/strong><\/p>\n

Polyurethane adhesives and sealants provide strong bonding in a variety of applications. Polyurethane adhesives provide an initial bond before fully curing, which is referred to as “green strength.” This reduces clamping and holding materials, which may help cut costs by increasing throughput.<\/p>\n

Polyurethane adhesives are used in automotive interiors, windshield bonding, in the assembly of shoes, and for in-home use in glue products such as Gorilla Glue\u00ae and Excel Adhesives. The ends of conveyor belts are typically closed using polyurethane adhesives. Polyurethane sealants are used in road repair, plumbing, construction and anywhere else a high-strength, water-resistant seal is needed.<\/p>\n

Polyurethane Elastomers <\/strong><\/p>\n

Polyurethane elastomers can be created with a wide variety of properties and molded into almost any shape. Depending on the intended use, polyurethane elastomers can provide resistance to:<\/p>\n