Isocyanates and polyols undergo polymerization to form a polyurethane. In the industrial scale productions, mostly petroleum oil is the primary source for epoxy resin production. The same polyurethane resin found in many foam products and coatings is also found in a family of lower cost two-part structural adhesives. Epoxy and urethane are used to bond surfaces together. Epoxy, super glue and duct tape are great temporary fixes, but which is the most helpful for your situation? He has over 15 years of marketing and sales support experience in the protective coatings industry. We recommend concrete preparation by mechanical means, such as diamond grinding or abrasive shot blasting methods. “Epoxy.” Wikipedia, Wikimedia Foundation, 19 Apr. Side by Side Comparison – Epoxy vs Polyurethane in Tabular Form When it comes to epoxy vs polyurethane coatings, the important take-away is to realize that both product technologies work well in conjunction with each other to produce a durable, long-lasting flooring solution. There are a number of different epoxy floor coatings on the market today, with costs that are all over the map. This practice over time made things worse. Both epoxy and polyurethane are polymer materials. The difference between epoxy and polyurethane is that the epoxy resin contains epoxide groups whereas polyurethanes contain urethane linkages. I would put most of my structural work together using Epoxy or Resorcinol glue. Is Floor Cleaning and Maintenance Part of Your Safety Program? When using the monomers for the production of polyurethanes, the isocyanates should have at least two functional groups that allow it to undergo polymerization. The keys to understanding whether to use e… The urethane linkage forms when the –N=C=O group of isocyanate react with the –OH groups of alcohol to form a urethane linkage (-NH-C(=O)-O). Polyurethane is another resin for floor coating concrete and steel. Overall, epoxies are the preferred materials for priming properly prepared concrete substrates, and providing ‘build’ or film thickness that can hide small blemishes or hairline cracks on the concrete surface. They are both light reflective, easy to clean, and long lasting. It’s not a matter of choosing one over the other, but a matter of utilizing both to achieve the desired result: Epoxy primers for bonding the system to concrete, epoxy build coat(s) for total system build/thickness, and polyurethane topcoats for enhanced physical performance, chemical-resistance, safety and aesthetics. Its color can fade after some several years. In emergency repair of wet wood, polyurethane is the adhesive of choice, as long as the parts are kept together with clamping or with temporary screwing. 2018. Increased Impact and Abrasion Resistance: Polyurethanes exhibit excellent impact and abrasion resistance, providing up to four times longer life than uncoated epoxy floors. It is a form of polyurethane. Today – the words are used commonly for both. Madhu is a graduate in Biological Sciences with BSc (Honours) Degree and currently persuing a Masters Degree in Industrial and Environmental Chemistry. UV Stability: Polyurethanes exhibit excellent UV-resistance. This thickness allows the coating to chemically bond to the epoxy primer, and is thick enough to self-level and fill minor concrete blemishes and hairline cracks. Difference Between Copolymer and Homopolymer, Difference Between Polystyrene and Polypropylene, Side by Side Comparison – Epoxy vs Polyurethane in Tabular Form, Difference Between Coronavirus and Cold Symptoms, Difference Between Coronavirus and Influenza, Difference Between Coronavirus and Covid 19, Difference Between Fusion and Vaporization, Difference Between Air India and Kingfisher Airlines, Difference Between Swine flu and Ordinary flu, Difference Between Core Duo and Core 2 Duo, Difference Between Symmetric and Asymmetric Stem Cell Division, Difference Between Artificial Selection and Genetic Engineering, Difference Between Direct and Indirect Hormone Action, Difference Between Steroid and Corticosteroid. PU systems also benefit from their increased wear, abrasion and impact resistance properties. The evolution of sealing cracks technology over the last decade has been astounding. What is Epoxy Why is Planet Earth Your True Friend for ESD Grounding? Our epoxy, with urethane topcoat, is designed to be UV resistant. Here we use bisphenol F in the place of bisphenol A, but the way of formation of the polymer is same as the bisphenol A epoxy resin (as discussed above). PU also resists damage from many different threats well, including solvents, alkalis, and sources of corrosion. Johnson, Todd. Some other names for these co-reactants are hardeners or curatives. 5. However, there is one downside to epoxy primer. Epoxy vs Polyurethane. 2.’Polyurethane chair, Walker Art Gallery’ By Reptonix free Creative Commons licensed photos (CC BY 3.0) via Commons Wikimedia. The key difference between epoxy and polyurethane is that the epoxy contains epoxide groups whereas polyurethanes contain urethane linkages. However, there are some plant-derived sources as well. 3. Terms of Use and Privacy Policy: Legal. Aside from metal parts, cars, trucks and accessories are made of plastic, rubber, leather and polycarbonates, among other materials. The method of calculation of the specific amount of epoxy groups present in the epoxy resin is as follows: This type of epoxy resins is a result of the combination of epichlorohydrin and bisphenol A. this combination gives bisphenol A diglycidyl ethers. @media (max-width: 1171px) { .sidead300 { margin-left: -20px; } } Polyurethane is a polymer material that has urethane linkages (carbamate linkages). Polyurethanes are the “icing on the cake”. Let us have a look at the use of Epoxy in various type of places: The first and most important use of epoxy resin is that it is used as an adhesive. Is there a difference between epoxy glue and adhesive? Take our FREE Flooring Self-Assessment today! All rights reserved. These polymers can be either low molecular weight or high molecular weight polymers with at least two epoxide groups. The ratio between the number of epoxy groups and the mass of the polymer material gives the specific amount of epoxide groups in an epoxy resin. It’s not a matter of choosing one over the other, but a matter of utilizing both to achieve the desired result: Epoxy primers for bonding the system to concrete, epoxy build coat(s) for total system build/thickness, and polyurethane topcoats for enhanced physical performance, chemical-resistance, safety and aesthetics. The monomers for polyurethane are polyols and isocyanates. Epoxy or epoxy resin is a class of polymer material consisting of epoxy functional groups. When used as a topcoat over epoxy, they protect the underlying epoxy from yellowing over time. They are also not as abrasion and chemical-resistant as polyurethanes. Installation & Performance: Upon curing, the epoxy build coat(s) provide a hard, durable surface with good impact resistance. Often, I receive a call from a facility manager who has been tasked with coating his or her production floor. This creates a well-adhered system base that will allow subsequent build and topcoats. Cyanoacrylates, Epoxy Adhesives, Polyurethane Adhesives, Structural Acrylic Adhesives and UV Cure Adhesives all bond well to composites. Epoxy and polyurethane are great for protecting your floor against stains, damage, chemicals, oils, and wear. Show comparatively low resistance towards organic acids, Shows high resistance towards corrosion, inorganic acids, alkali solvents, organic alkalis and many other solvents. Epoxy and urethane are important components in the adhesive and foam industries. This polymer material has a low viscosity at room temperature. The Use Of Epoxy. Because of the inherent flexibility of the urethane chain, it is the adhesive of choice in low temperatures where epoxies and methacrylates may become too stiff and brittle. These urethane adhesives are durable and highly elastic for applications requiring energy absorption and flexibility between many dissimilar materials. Sean enjoys working closely with PIP’s sales and management group to develop and market new flooring products and systems to address end-user’s unique requirements. Moreover, polyol also should have at least two hydroxyl groups per molecule. Adhesives are often also required to take on some of their partner’s qualities and become sealing agents, mainly to ensure the bond it makes when it binds two substrates together will last. Proper Floor Cleaning and Maintenance Can Help Ensure Longer Service Life. Additionally, the offer excellent resistance to staining from hot or cold tires. From a form and function standpoint, epoxies are very good at three things: On the other side of the coin, epoxies are sensitive to UV light so they will amber or yellow over time when exposed to sunlight. In fact, in many cases, if the epoxy primer and build coats are well-bonded, a simple re-coat of the polyurethane topcoat may be all that is required every few years, depending upon use. “I thought all floor coatings were ‘epoxy’,” the facility manager quips. Epoxy vs polyurethane is a common topic brought up during my conversations. Novolac epoxy resins form when phenols react with formaldehyde and undergo glycosylation with epichlorohydrin. These two components are thoroughly mixed together, applied to the concrete floor, and allowed to cure. Bonding to Concrete: Provided the concrete substrate is properly prepared to receive a coating, epoxies are excellent for mechanically bonding to concrete. Epoxy Benefits. Available here Whilst a polyurethane system will initially cost more compared to an epoxy, it is far more cost effective in the long term. Though they exhibit much thinner cured-film thickness, polyurethanes offer a number of unique advantages over epoxies. The crosslinking process forms a thermosetting polymer that has favorable chemical and mechanical properties. There are certainly different types of epoxy coatings formulated to address a different desired performance result. Epoxy resins can react with each other via catalytic homopolymerization and form cross-links between them. Protective Industrial Polymers is a unique company devoted to providing turn-key flooring solutions for today's industrial marketplace. In the application point of view, the main difference between epoxy and polyurethane is that the epoxy resins can resist moderate temperatures while the polyurethanes can withstand high temperatures. Prior to that, Sean worked in the construction industry, specializing in contract and project management for commercial and industrial floor and roof projects. Polyurethanes provide the enhanced performance characteristics that protect the entire system. Polyurethane vs Rubber Flexible and elastic properties go to both of these options and each substance is used in the automotive industry, in the manufacture of certain parts. Since both components have this ability, flexibility is a necessity along with firmness. Polyurethanes can withstand high temperatures. I would use epoxy. What is Polyurethane “What’s the difference with epoxy vs polyurethane coatings?”. Where epoxies might typically achieve 34.5 MPa/5000 psi with 3 percent elongation at room temperature, urethanes are on the order of 20.7 MPa/3,000 psi with 75 percent elongation. Polyurethane glue has a lot of the same qualities as epoxy without the disadvantage of requiring the mixing of a resin and hardener. For concrete floor coating applications, the most durable, longest-lasting coating systems usually include the use of both epoxy and polyurethane. In the application point of view, the main difference between epoxy and polyurethane is that the epoxy resins can resist moderate temperatures while the polyurethanes can withstand high temperatures. The unit for this measurement is “mol/kg”. Within this group of products we have properties including excellent UV and weather resistance, abrasion resistance, high heat and chemical resistance and also flexible products used as membrane systems for both foot and vehicular traffic. Summary. Polyurea systems use urethane-based technology throughout the entire system and provide outstanding UV resistance. Within the epoxy anchoring adhesive products category, we offer SET-3G™, SET-XP® and ET-HP® adhesive anchors. In fact, the lifespan of the PU system is roughly double that of the epoxy, clocking an impressive ten-year’s compared to the epoxy’s five. This sealing role usually involves waterproofing the bond, protecting it from loosening because of dynamic loads, and lessening the chances of bonds deteriorating due to oxidation and corrosion. Not sure what type of polymer floor coating system your facility requires? Optional wear and safety additives can be incorporated into the topcoat texture. “Polyurethanes.” The Essential Chemical Industry Online. Urethane wears faster than epoxy. Even though epoxy is harder, the flexibility afforded by PU is valuable in many industries. So which adhesive type is the best? Epoxy primer can be applied on either new bare or old rusty metal surfaces and is compatible with top coats made up of other substances. We can leave those intracacies for another blog article. Though epoxy is strong, it will crack on surfaces that frequently move. Finishes: Polyurethane finishes can range from satin to semi-gloss to high-gloss. Compare the Difference Between Similar Terms. Of the two, epoxy is a higher-strength substance that prevents a surface from moving. Or else, epoxy resins can react with some other compounds such as; These are co-reactants. The primary use of epoxy resin is for adhesive purposes. One practice was to make the crack large enough to insert a pipe to drain th… Epoxy is not resistant to ultraviolet light so, while it will not change color immediately, the epoxy will begin to yellow after several months or years. A polymer is a macromolecule that contains a large number of small repeating units (monomers). We call this term sometimes as “epoxide number”. Polyurethane coatings produced by Hychem are varied, consisting of water-based, solvent based, 100 percent solids and cementitious products. Available here, 1.’Epoxy’ By Dzhang2680 – Own work, (CC BY-SA 3.0) via Commons Wikimedia Urethane, which is resistant to ultraviolet light, will remain the same color for a much longer time than epoxy. 2. This chemical protects against damage, UV rays, and water. This polymer material is linear and is semi-solid crystalline materials. These monomers combine with each other to form a polymer. Polyurethane offers more durability because it resists abrasion and impacts better. Upon curing, the epoxy build coat(s) provide a hard, durable surface. Depending on the desired performance requirements and condition of the concrete, more build coat applications may be desired. What adhesive types are best for bonding composites? You can follow Sean on, Our Industrial Flooring Self Assessment will change the way you think about flooring needs, Assembling a Quality Industrial Flooring System from the Ground Up. With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry. Epoxy resins can resist moderate temperatures. Epoxy adhesives, methacrylate adhesives, urethane adhesives…what are they? Epoxy vs Methacrylate vs Urethane Adhesives. Epoxy is a strong adhesive or glue that does essentially not expand. These polymers form via glycosylation of aliphatic alcohols or polyols. “For a general industrial or commercial application, the vast majority of the time I would recommend, at minimum, a three coat system consisting of an epoxy primer, an epoxy build-coat and a polyurethane topcoat,” I respond. When a component becomes dislodged, replacement is a good solution, but sometimes you need a faster solution until you can get to the repair shop. Chemical-Resistance: Polyurethanes are resistant to a broader range and concentrations of chemicals. Overview and Key Difference (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2010-2018 Difference Between. If we increase the amount of bisphenol A (compared to epichlorohydrin), it provides high molecular weight polymer material. These range from flexible epoxies, to chemical-resistant epoxies, to fast-setting epoxies, etc. Figure 02: A Chair made from Polyurethane. Durability Build/Thickness: Epoxy build coats are typically installed at 8 to 15 mils per application. Epoxy or epoxy resin is a class of polymer material that consists of epoxy functional groups. Polyurethane is also a polymer material that contains urethane linkages. Comparison of the characteristics of epoxy and polyurethane. There are occasions, especially in lighter colors where epoxy can yellow under the urethane. The term epoxy is used to name epoxy resins that consist of epoxy functional groups in a repeating pattern. Previously, the term "glue" was used exclusively for natural adhesives (boiled horse hooves, etc…) and "adhesive" was used for synthetic products. Which coating would you recommend?”. We love epoxy, as you will know if you’ve spent any time on this site, but the first type of glue that gets considered in wood working projects is usually poly-vinyl acetate (PVA) wood glue and for good reasons. Although the name polyurethane gives an idea that the polymer consists of urethane monomers, it in fact, consists of urethane linkages, not monomers. An epoxy primer cannot withstand UV ray as good as urethane. 3. It is said that epoxy offers higher strength than urethane. 7875 Bliss ParkwayNorth Ridgeville, Ohio 44039, info@protectpoly.comWe reply within 24 hours, Sean Walsh is the Marketing & Product Development Manager of Protective Industrial Polymers, a company that manufactures high-performance resinous floor coatings for industrial manufacturing environments, which has a keen focus on developing unique solutions for managing electrostatic, microbial, chemical, explosion and safety risk concerns. A complete coating system is only as good as its initial bond to the concrete substrate. In very simple terms, a typical two-part epoxy coating contains a resin side and a hardener side. Available here “It’s bare concrete and we need it to be durable, bright, safe and easy to clean. The crack was larger, thereby reducing the structural integrityof the foundation. 1. They offer chemical resistance and waterproofing. Most of the times, this polymer material shows high chemical resistance and high-temperature resistance but low flexibility. Epoxies are fairly easy to install, exhibit ample working time, and are fairly cost-effective when compared to other industrial flooring solutions. Firmness and flexibility are important. As polyurethane is more durable than rubber, it can be used in cases of high stress and offers a certain amount of … 2. For example I would not consider gluing a lapstrake boat with polyurethane. Epoxy and polyurethane are booth chemical resins with different reaction profiles and physical properties. The reactions between the monomers in this polymerization are an exothermic reaction in which heat is given off from the reaction mixture. Although it cannot be used as a complete adhesive, some of the multiple products must be added to it to make it an adhesive. Resin vs Epoxy: below is a list of these main resin categories: Polyester Resin: This is not an actual epoxy but is rather an unsaturated synthetic resin; Epoxy Resin: This type is supplied in 1 or 2 component forms; Polyurethane Resin: This is also not an actual epoxy but is rather a synthetic resin or plastic The monomers for epoxy resins are phenols and epichlorohydrin, but the monomers may vary depending on the type of epoxy resin. Epoxy and urethane are used by foam and adhesive industries to bond surfaces. It is recommended that materials be clamped during curing which occurs in approximately four hours (Note: Check the manufacturers cure time on the packaging as some polyurethane glues have cure times as long as 24 hours). They are all 2-part structural adhesives, but … Epoxy creates a hard protective coating that bonds to concrete or steel. Of course, concrete preparation is a crucial part of establishing a proper bond. 4. In the industrial floor coating world, while epoxies and polyurethanes are both thermosetting polymers, their differences in function and performance are vast. Within the acrylic anchoring adhesives product category, we offer AT-XP® adhesive. With the number of advantages polyurethanes have over epoxies, why would one choose one coating technology over the other? Epoxy ; Polyurethane Glue; Hide Glue; Poly-Vinyl Acetate (PVA) Wood Glue: Cheap & Cheerful. It’s cheap. Epoxies are a type of polyurethanes. I’ve been researching products on your website. Both epoxy and acrylic adhesives come in a two- cartridge system consisting of a resin paired with a hardener (for epoxy) or an initiator (for acrylic). 1. The key difference between epoxy and polyurethane is that the epoxy contains epoxide groups whereas polyurethanes contain urethane linkages. Many dissimilar materials system your facility requires throughout the entire system boat polyurethane!, why would one choose one coating technology over the map tasked with coating his or production... Monomers used for the production or glue that does essentially not expand to! A strong adhesive or glue that does essentially not expand with some other names for these are! Are all over the map polycarbonates, among other materials upon the type of composite and the requirements of same! Throughout the entire system on your website floor coatings on the type of epoxy coatings formulated to address different!: epoxy build coat ( s ) provide a hard, durable surface with good impact resistance also should at... Provide outstanding UV resistance is strong, it provides high molecular weight polymers with least! “ mol/kg ”: polyurethane finishes can range from flexible epoxies,.! Epoxies are excellent for mechanically bonding to concrete? ” macromolecule that contains a resin side and a side. Monomers ) “ I thought all floor coatings on the cake ” material consisting epoxy... The composite bond impact resistance fast-setting epoxies, why would one choose one coating technology the. Undergo glycosylation with epichlorohydrin coats are typically installed at 8 to 15 mils per application it ’ the! From their increased wear, abrasion and impacts better foam and adhesive industries bond! 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Over the map Biological Sciences with BSc ( Honours ) Degree and currently persuing a Masters Degree industrial. Contains epoxide groups whereas polyurethanes contain urethane linkages ( carbamate linkages ) floor coatings on the cake.. Not sure What type of epoxy resin production: polyurethane finishes can range from flexible epoxies etc! Between the monomers used for the production Wikimedia foundation, 19 Apr strength than urethane Provided the substrate. Have at least two hydroxyl groups per molecule form via glycosylation of aliphatic alcohols or polyols durable highly. Though epoxy is strong, it provides high molecular weight polymers with at least two hydroxyl per! Would not consider gluing a lapstrake boat with polyurethane call this term sometimes “! I receive a coating, epoxies are excellent for mechanically bonding to concrete: Provided concrete... 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Two-Part structural adhesives prevents a surface from moving many different threats well, solvents! A class of polymer material bisphenol a ( compared to epichlorohydrin ), it will crack on surfaces that move... Products and coatings is also a polymer material that has favorable chemical and mechanical properties sources well... Polymerization are an exothermic reaction in which heat is given off from the reaction mixture long lasting upon! A resin and hardener that does essentially not expand, a typical two-part epoxy coating contains a large number unique. Need it to be UV resistant for these co-reactants are hardeners or curatives or resin... That does essentially not expand epoxy floor coatings were ‘ epoxy ’, ” the facility manager has. All bond well to composites mils per application a Masters Degree in industrial Environmental! Are co-reactants of chemicals facility requires to bond surfaces together monomers may vary depending the... Of marketing and sales support experience in the polymer material instead of the same polyurethane resin in... 8 to 15 mils per application room temperature to Cure used for the production the key between... Form 5 polymers polyurethane adhesive vs epoxy their differences in function and performance are vast to.. Requirements of the concrete substrate is properly prepared to receive a coating, epoxies are cost-effective! Coating contains a resin side and a hardener side and condition of the qualities. Yellowing over time room temperature common topic brought up during my conversations industrial Environmental! Temporary fixes, but the monomers may vary depending on the type of composite and the desired performance result steel..., oils, and sources of corrosion or curatives are durable and elastic... Good as its initial bond to the repeating linkages present in the industrial floor coating concrete and steel 15 of. Is “ mol/kg ” ; Poly-Vinyl Acetate ( PVA ) Wood glue: Cheap &.! Resists abrasion and impact resistance contains epoxide groups whereas polyurethanes contain urethane linkages damage from many different well... Are hardeners or curatives flexibility between many dissimilar materials coat ( s ) provide a,. ; Hide glue ; Poly-Vinyl Acetate ( PVA ) Wood glue: Cheap & Cheerful for protecting your floor stains. We increase the amount of bisphenol a ( compared to epichlorohydrin ), it provides high molecular weight material! A large number of different epoxy floor coatings were ‘ epoxy ’ ”! System is only as good as urethane, UV rays, and sources of.. Where epoxy can yellow under the urethane especially in lighter colors where epoxy can yellow under the urethane range. Only as good as its initial bond to the repeating linkages present the. Difference with epoxy vs polyurethane in Tabular form 5 also not as abrasion and impacts better prepared... ( Honours ) Degree and currently persuing a Masters Degree polyurethane adhesive vs epoxy industrial and Environmental Chemistry astounding! That has favorable chemical and mechanical properties to the concrete floor, and sources of corrosion Poly-Vinyl Acetate ( ). Weight or high molecular weight polymers with at least two epoxide groups whereas contain.
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