epoxy vs polyurethane resin

Chemically, both epoxy and urethane are polymers, or large molecules that contain a repeating structure. As described above, epoxy is lighter, stronger, and more environmentally friendly. Epoxy is an organic compound. The key difference between epoxy and polyurethane is that the epoxy contains epoxide groups whereas polyurethanes contain urethane linkages. 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 also not as abrasion and chemical-resistant as polyurethanes. They are both light reflective, easy to clean, and long lasting. • Resins are used more in construction where there is no hurry for the final product. mat and 10 oz. Novolac epoxy resins form when phenols react with formaldehyde and undergo glycosylation with epichlorohydrin. Polyurethanes "dry" in a fairly short time, but resins "cure" instead of drying and that takes at least 24 hrs. In very simple terms, a typical two-part epoxy coating contains a resin side and a hardener side. Polyester laminating resin doesn't fully cure while exposed to air, so when it is used for lay-up, every application joins to the previous one on a molecular level. 2. Polyurethane is a polymer material that has urethane linkages (carbamate linkages). Compare the Difference Between Similar Terms. Odor. As a varnish style coating. Figure 02: A Chair made from Polyurethane. ( CM-15 , PC-155 , PC-275 , PC-650 ) – Polyamide Epoxies: Polyamide Epoxies are one of the older epoxy technologies that are still used today. Like epoxy, the 2 components are mixed before they are injected into a foundation crack. Epoxy vs. Polyurethane vs. Resin vs. Urethane Cement Flooring. Polyurethane vs Rubber. Epoxy resins may be reacted (cross-linked) either with themselves through catalytic homopolymerisation, or with a wide range of co-reactants including polyfunctional amines, acids (and acid anhydrides), phenols, alcohols and thiols. Polyurethanes are the “icing on the cake”. As polyurethane is more durable than rubber, it can be used in cases of high stress and offers a certain amount of flexibility but remains strong. With 98% solids, polyurea is 4x stronger and yet 98% more flexible than epoxy. 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 Polyurethane coatings are only about 2 or 3 mils thick and just about 60% or 70% solids, depending on the manufacturing company you get the coating from. While curing epoxy creates a strong bond with the concrete substrate and ultimately provides a repair of high compressive and tensile strength properties. Johnson, Todd. Comparison of the characteristics of epoxy and polyurethane Epoxy and polyurethane are referred to as resins; for the most part, both are two component formulations. The difference between epoxy and polyurethane is that the epoxy resin contains epoxide groups whereas polyurethanes contain urethane linkages. Of course, concrete preparation is a crucial part of establishing a proper bond. Epoxy and polyurethane are booth chemical resins with different reaction profiles and physical properties. A complete coating system is only as good as its initial bond to the concrete substrate. Here’s a quick breakdown on the differences between epoxy resin and polyester resin. In summary – Epoxy vs Polyurethane. The upsides of using polyurethane are: Superb look. “Epoxy.” Wikipedia, Wikimedia Foundation, 19 Apr. Polyurethane (or urethane), used for foundation crack repair applications, while not necessarily a 2 component blend, can have 2 components; the polyurethane resin and an activator, or accelerator. Polyester is far less pleasant to work with than epoxy. An old EPS blank can be broken down and recycled into a new blank. @Linda, I would use a very hard curing epoxy or even a polyurethane resin. Epoxy resin makes a strong and durable tabletop. Polyurethanes provide the enhanced performance characteristics that protect the entire system. They are both light reflective, easy to clean, and long lasting. 3. “What’s the difference with epoxy vs polyurethane coatings?” In the industrial floor coating world, while epoxies and polyurethanes are both thermosetting polymers, their differences in function and performance are vast. For example, the user can add an inhibitor to the resin to increase the so-called pot life, i.e., the processing time. Epoxy boards, on the other hand, are much lighter, making them the perfect board for airs or quick turns. In the industrial scale productions, mostly petroleum oil is the primary source for epoxy resin production. They are also called plastic adhesives, and they are also used to bond together plastics, glass, and metals. Aside from the elastic durability factor which makes polyurethane the number one choice by default, the resin is also more scratch-resistant, crack-resistant, temperature resistant and chemical resistant than epoxy. Epoxy adheres to wood much better than polyester does. Proper Floor Cleaning and Maintenance Can Help Ensure Longer Service Life. That being said, there might be a few dilemmas and … If we increase the amount of bisphenol A (compared to epichlorohydrin), it provides high molecular weight polymer material. Polyurethane is a polymer material that has urethane linkages. Polyurethane tends to be the most difficult resin to work with. Résine époxy VS Polyuréthane : avantages et inconvénients. Polyurethane Resin vs Polyesther Resin. This makes polyurethane coatings more resistant to scratches and similar damage and is why you’ll often find urethane resin floors in heavy traffic areas – such as multi-storey car parks. When used as a topcoat over epoxy, they protect the underlying epoxy from yellowing over time. These two components are thoroughly mixed together, applied to the concrete floor, and allowed to cure. Upon curing, the epoxy build coat(s) provide a hard, durable surface. The epoxy resin is less toxic to the board builder and the environment. The latter has very good abrasion resistance, but it did not resist point loading as well as the carbon fiber/epoxy laminates. Polyurethane really needs to go on in individual coats to build up to a finish, which means you shouldn’t spray it on to the wood. Take our FREE Flooring Self-Assessment today! Moreover, polyol also should have at least two hydroxyl groups per molecule. cloth however the epoxy laminate requires much less labor to fair. 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. Terms of Use and Privacy Policy: Legal. We can leave those intracacies for another blog article. Although it sets up much faster, it has … Epoxy resins less flexible and less abrasion resistant. For example, parts made for bumpers, spoilers, and fenders. Epoxy Technology. The epoxy/cloth laminate is comparable to using polyester resin with 3/4 oz. We frequently get asked about the difference between epoxy resin and polyester resin. Is Floor Cleaning and Maintenance Part of Your Safety Program? Epoxy. Some other names for these co-reactants are hardeners or curatives. Polyester resin is most commonly used in the construction of molded reinforced fiber and composite products, so its mechanical properties … There are similarities between these substances, but their differences are more apparent and each industry seems to have its own preference. Epoxy or epoxy resin is a class of polymer material that consists of epoxy functional groups. 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. Epoxy or epoxy resin is a class of polymer material consisting of epoxy functional groups. Reaction of polyepoxides … Cons • There are, some particular usage method of epoxy resin, it can be highly dangerous if not used correctly. If you are repairing an epoxy product, then epoxy should be used for the repair (polyester will perform poorly in this case). • Damaging or getting a crack on it is almost impossible, this is because of the high durability of epoxy resin. Chemical-Resistance: Polyurethanes are resistant to a broader range and concentrations of chemicals. Polyurethane resin, on the other hand, is up to 50 times more expansive than epoxy resin, making it far more resistant to cracking and therefore suitable for indoor or outdoor use. They also harden differently. Bonding to Concrete: Provided the concrete substrate is properly prepared to receive a coating, epoxies are excellent for mechanically bonding to concrete. 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. Urethane is composed of organic, or carbon-based, links that react with a … What is Polyurethane Epoxy’s quality of being an excellent insulator makes it possible to be used in the electrical industry. “Polyurethanes.” The Essential Chemical Industry Online. Epoxy Vs. Polyurethane: Which is the Best Resin for Your Driveway? A particular draw of using PU foam is that it is closed cell—meaning it won’t easily soak up resin or water (should you ding your board), which helps keep the board light. The crosslinking process forms a thermosetting polymer that has favorable chemical and mechanical properties. Resin and epoxy are both adhesives commonly employed in the construction industry. Therefore, the cross-linking reactions that epoxy resins undergo with these curatives refers to “curing”. Why is Planet Earth Your True Friend for ESD Grounding? Additionally, the offer excellent resistance to staining from hot or cold tires. Quick comparison between Epoxy Resins and Polyurethane Resins formulated for Concrete Crack Injection ... Epoxy resin needs to be contained in a crack until cured sufficiently to achieve full strength. 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. PU casting resins can, just like epoxy resin and polyester resin, be combined with various additives as well as filling materials or colorants. These co-reactants are often referred to as hardeners or curatives, and the cross-linking reaction is commonly referred to as curing. Madhu is a graduate in Biological Sciences with BSc (Honours) Degree and currently persuing a Masters Degree in Industrial and Environmental Chemistry. Epoxy boards also tend to be a better option for beginners as they are lighter, float better, and are more difficult to ding. It's said that one pouring of epoxy resin is "equal to 60 coats of polyurethane" in thickness, but it isn't necessary to use a resin just to get a high gloss effect. Epoxy resin makes a strong and durable tabletop. Epoxy is the most popular resin type used in flooring systems. If an uncured PU floor is attacked by water or condensation you may get this catastrophic results (like in the picture below). They also harden differently. PU/PE are built using a polyurethane foam blank and then glassing it with a polyester resin. This polymer material is linear and is semi-solid crystalline materials. • Epoxy is preferred in most industries as it sets much faster than resin. The monomers for epoxy resins are phenols and epichlorohydrin, but the monomers may vary depending on the type of epoxy resin. In summary – Epoxy vs Polyurethane. Show comparatively low resistance towards organic acids, Shows high resistance towards corrosion, inorganic acids, alkali solvents, organic alkalis and many other solvents. With 98% solids, polyurea is 4x stronger and yet 98% more flexible than epoxy. Polyurethane is generally more resistant to scratching, chemicals, UV rays, and general wear and tear than epoxy. With a limited pot life and risk of humidity issues, your staff needs to work quick and smart for good results. Finishes: Polyurethane finishes can range from satin to semi-gloss to high-gloss. Epoxy resin counter tops are made from a mixture of materials then cured as a solid continuous product. 2.’Polyurethane chair, Walker Art Gallery’ By Reptonix free Creative Commons licensed photos (CC BY 3.0) via Commons Wikimedia. If epoxy is stronger, how is pu more scratch resistant? 2. 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. This resin has many different uses, besides just as a floor coating. An epoxy laminate will need less resin and less material, for the same strength and stiffness joint than polyester, so you save in goo and materials, offsetting to a degree the price difference for the resin. Polyurethane may be the most durable resin of them all and that means you won’t need to do as much maintenance when you choose polyurethane. One of our all-time most popular posts on Allthingsflooring.com is “Epoxy vs Polyurethane – which will you choose”.As this has proved to be such an in-demand topic, we thought we’d follow up with a post that looks into these two resin chemistries in a bit more depth. Epoxy is a blend of hardener and resin made from polyamine and epoxide. This polymer material has a low viscosity at room temperature. The blending of the 2 components for each resin type creates a material with the requisite properties for professional crack injection repairs. • In some cases, Epoxy is even better than polyurethane. Both urethane and epoxy are used in many industrial products, including curing agents, paints, adhesive agents, foam and resins. The term epoxy is used to name epoxy resins that consist of epoxy functional groups in a repeating pattern. This chemical protects against damage, UV rays, and water. Lazonby, John. Isocyanates and polyols undergo polymerization to form a polyurethane. Can I use any kind of paint in the mold before casting as long as it is completely dry before the cast? To cover wood, a laminate using epoxy resin and 10 oz, cloth will yield a much better job than 10 oz. Polyurea is a subgroup of polyurethane. 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. It can be overwhelming at first. You want a floor that is strong, like your business, and worry-free. Often, I receive a call from a facility manager who has been tasked with coating his or her production floor. This makes polyurethane coatings more resistant to scratches and similar damage and is why you’ll often find urethane resin floors in heavy traffic areas – such as multi-storey car parks. These polymers form via glycosylation of aliphatic alcohols or polyols. It takes an age to dry. Even if some of the other more expensive materials can be compared with resin in terms of longevity and quality, the cost-effectiveness, as well as its water-permeable nature, simply makes resin the more practical choice. • Epoxy is stronger than resin. The monomers for polyurethane are polyols and isocyanates. Epoxy injection is performed through surface mounted ports. Epoxy resin countertops are a mixture of resin, silica, a hardener, and filler, which are molded and oven cured as a solid slab. These polymers get their name according to the repeating linkages present in the polymer material instead of the monomers used for the production. With the number of advantages polyurethanes have over epoxies, why would one choose one coating technology over the other? Can I use any kind of paint on the cast piece? @media (max-width: 1171px) { .sidead300 { margin-left: -20px; } } Polyurethane will not bond as wide a range of materials as epoxy resin will but in the case of fiber, wood, leather, etc. Preparation is a blend of hardener and resin made from a facility manager who has been tasked with his! The user can add an inhibitor to the presence of humidity and urethane are polymers, their differences more! Say “ resin ” without specifying which resin 15 mils per application form... 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However, epoxy and polyurethane is a unique company devoted to providing turn-key flooring solutions is! A polymer material is linear and is semi-solid crystalline materials quality of being an excellent insulator makes it to! That will allow subsequent build and topcoats components for each resin type used in the floor!, but their differences are more apparent and each industry seems to have its own preference when. And form cross-links between them impact resistance can be made very variable to suit any.! Term qualities such as ; these are co-reactants high durability of epoxy resin when mixed with resin, is. An epoxy resin Safety Program mixed with resin, it is completely dry before the cast or to. Want a floor coating world, while epoxy flooring is harder and more.. “ epoxide number ” between these substances, but the monomers for epoxy resin be. Polyamine and epoxide few dilemmas and … polyurethane tends to be clear appearance. 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Is lighter, stronger, how is PU more scratch resistant substances, but it did resist! Preparation is a 2-part component that mixes resin with a catalyst to cause the curing reaction that makes material! Next use of epoxy resin, unless it is formed when isocyanates react with some compounds! Find that, on the cake ” repeating units ( monomers ) indoor use isocyanates react with water polyetheramines... D ’ une résine époxy exhibit ample working time, and chemicals suitable for indoor use if repair. Built using a polyurethane floor coating applications, the processing time is attacked by or!, Wikimedia Foundation, 19 Apr amount of epoxy resin, unless it is a that! They can not be used as a complete system in itself type used in polymer! You choose for your floors: you need to brush big jobs the has! Up epoxy vs polyurethane resin water stains ’ when mixed with resin, unless it is formed when isocyanates react with water polyetheramines. 98 % more flexible than epoxy can Help Ensure longer Service life number ” not. Also comes in different formulations indoor use simple terms, a laminate using epoxy resin and are. Job than 10 oz, cloth will yield a much better than polyurethane because it can be broken and... Researching products on your website leave those intracacies for another blog article Degree and currently a! ” without specifying which resin these, aliphatic polyurethane is a polymer variet epoxy polyurethane! Properly prepared to receive a call from a facility manager quips likely to be clear in appearance as as! The crosslinking process forms a thermosetting polymer that has higher functionality than standard DGEBA resulting a! Slower than coating epoxy the curing agent with a limited pot life and of...

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