Urethane coating resins

ARCOSOLV PMA is a colorless, combustible liquid with low toxicity. It has a characteristic ester odor and is soluble In water to the extent of 18% at 20°C. It has excellent solvency for a variety of substances Including acrylic, nitrocellulose and urethane coating resins. ARCOSOLV PMA is a substitute for ethylene glycol (E serles) ether acetates, particularly EEA and EMA. 

Polyols. Several important polyhydric alcohols or polyols are made from formaldehyde. The principal ones include pentaerythritol, made from acetaldehyde and formaldehyde trimethylolpropane, made from -butyraldehyde and formaldehyde and neopentyl glycol, made from isobutyraldehyde and formaldehyde. These polyols find use in the alkyd resin (qv) and synthetic lubricants markets. Pentaerythritol [115-77-5] is also used to produce rosin/tall oil esters and explosives (pentaerythritol tetranitrate). Trimethylolpropane [77-99-6] is also used in urethane coatings, polyurethane foams, and multiftmctional monomers. Neopentyl glycol [126-30-7] finds use in plastics produced from unsaturated polyester resins and in coatings based on saturated polyesters. 

Unsaturated polyester resins (UPRs) Uralkyd resins, 202 Urea-methylol reaction, 410 Urethane alkyds, 241 Urethane coatings, 202 Urethane elastomers, implanted, 207 Urethane foams, tests for, 244 Urethane gels, 205 Urethane-grade ATPEs, 223 Urethane-grade polyol types, 212 Urethane-grade raw materials, 246 Urethane hydrogel, preparation of, 250-251... 

Isocyanate Crosslinkers. A wide variety of both aromatic and aliphatic Isocyanate crosslinkers are used in coatings (4). Aliphatic isocyanates are used when external durability is required. The isocyanate crosslinker studied in this work is the biuret of hexamethylene diisocyanate (Figure 1). Although resins based on triisocyanurates have been claimed to be superior in durability (,22.) > biuret based triisocyanates are more commonly used. Urethane coatings are generally formulated with a ratio of isocyanate to hydroxy of around 1 1. 

Although blending with other coating resins provides a variety of ways to improve the performance of alkyds, or of the other resins, chemically combining the desired modifier into the alkyd structure eliminates compatibility problems and gives a more uniform product. Several such chemical modifications of the alkyd resins have gained commercial importance. They include vinylated alkyds, silicone alkyds, urethane alkyds, phenolic alkyds, and polyamide alkyds. 

Immediately after the drawing process the fiber is coated (e.g. with a silicone resin, PVC, urethane-acrylate resins) to prevent microcracking and thus significantly increase its tensile strength, so that it can withstand the tension in the manufacture and installation of cables. 

Use Alkyd resins, rosin esters, urethane coatings and foams, surfactants, lubricating oil additives. 

Use Intermediate in adhesives, urethane coatings, and elastomers solvent diluent for epoxy resins synthetic fibers organic synthesis. 

As mentioned earlier, UV-curable resin formulations are very attractive for fiber coating because of the rapid cross-linking rates that are achievable. Most commonly, epoxy- or urethane-acrylate resins are employed (18-22), and viscosity and cross-link density are controlled through the addition of reactive diluents. With these systems work has focused on producing low modulus, low T properties (20-22) through the incorporation of appropriate chemical constituents to enhance higher chain flexibility, for example, ether linkages. 

Light-stable urethane coatings with excellent physical properties prepared by the reaction of ADNC with either polyols or with a combination of polyols and epoxy resins in the presence of suitable catalysts have been described by Frisch et al. (188). 

Form-A-Coat 30-200. [TACC IntT.] One-component urethane conforming coating resin and varnish. 

T-OOO, 1000, 3000, 4000. [Olin] PPG triol plasticizer, chemical intermediate for resins, brate fluids, rigid and flexible urethane foams, nonfoam urethane coatings, adhesives, elastomers, sealants and caulks ... 

Kumar, V, Bhardwaj, YK, Goel, NK, Francis, S, Sarma, KSS, Dubey, KA, Chaudhari, CV, Sabharwal, S. 2008. Coating characteristics of electron beam cured bisphenol A diglycidyl ether diaciylate resin-co-aliphatic urethane acrylate resins. Surf Coat Technol 202 5202-5209. 

Urethane resins are synthesized from isocyanates and chemical compounds with hydroxyl or urethane groups (—N—C—O—) including water, polyesters, epoxies, and acrylics [8,9]. The chemical structure of urethane coating is shown in Fig. 13.4. Polyester and epoxy have better barrier resistance to moisture and chemical attack than the acrylic polyol. Ahphatic isocyanate-based coatings are resistant to UV hght and have excellent gloss and color retention. 

Chem. Descrip. Urethane acrylate resin/SR 454 (PEG-3 trimethylolpro-pane triacrylate) blend, and < 400 ppm MEHQ inhibitor Uses Urethane-acrylic for UV/EB-curable coatings (plastic, PVC floor, wood) and inks... 

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