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Products and Properties Desmodur®/Desmophen® for Coatings

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Products and Properties Desmodur®/Desmophen® for Coatings Products and Properties Desmodur®/Desmophen® for Coatings Commercial Products Desmodur®/Desmophen® This brochure provides an overview of the commercial products from our Desmodur®/Desmophen® range with their key technical data and applications. The information covers aliphatic and aromatic poly- isocyanates (Desmodur®), polyacrylate, polyester and polyether polyols (Desmophen®) as co-reactants for polyisocyanates in 2K-PUR systems, the products from the Desmocap®, Desmolac® and Desmotherm® families, and specialities. In addition to the Desmodur®/Desmophen® products, Bayer MaterialScience markets the Bayhydrol®/ Bayhydur® and Roskydal® ranges. Bayer Material- Science – one of the world’s leading producers of coat- ing raw materials – therefore possesses a comprehen- sive portfolio of high-grade building blocks for polyurethane coating systems. Coating raw materials from Bayer MaterialScience meet the many requirements of the coatings industry and are used in a wide variety of applications. These include automotive OEM finishing, transportation coating, automotive refinishing, industrial coating, plastics coating, corrosion protection, wood and furniture finishing, structural protection, floor coatings and roof membranes. 2 Overview 4 Basic principles 6 Desmodur® – TDI-based 8 Desmodur® – MDI-based 10 Desmodur® – HDI-based 12 Desmodur® – IPDI-based 12 Desmodur® – blocked grades 14–16 Desmophen® – polyesters 16 Desmophen® – reactive thinners 18 Desmophen® – acrylates 18 Desmophen® – polyethers 20 Desmodur® and Desmophen® combinations 22 Desmotherm® 22 Desmolac® 24 Desmocap® 24 Specialities 26 Legend 3 Desmodur®/Desmophen® Basic chemical reactions Film formation in classic two-pack coatings is This reaction occurs if the base products are largely the result of addition reactions multifunctional, i.e. each molecule contains between the isocyanate groups of the poly- at least two isocyanate or hydroxyl groups. isocyanate and the hydroxyl groups of the For a film to form, wich requires three-dimen- polyol compound to form substituted sional crosslinking, at least one of the co- polyurethanes. reactants should have three or more func- tional groups in the molecule. Isocyanate groups may also react in a similar H way with other compounds containing I reactive hydrogen atoms, e.g. with amino and [1] R–N=C=O+R’–OH R–N–C=O imino compounds, carboxyl groups or, simplest I O–R’ of all, water. In the case of moisture-curing one-pack stable carbamic acid and splits off carbon di- systems, the polyisocyanates cure through oxide. The amino groups react directly with the reaction of free isocyanates with water in isocyanates to form urea, as shown by the the form of atmospheric humidity. This reac- formulae below: tion produces primary amino groups via un- R–N=C=O + H O –– R–NH + CO [2a] 2 2 2 – [2b] R–NH2 + R–N=C=O –– R–N–C–N–R I II I H O H PU coatings nearly always dry in the pres- shown in the formulae above also occur in ence of atmospheric moisture. This is why, to two-pack systems. a lesser extent, the crosslinking reactions NCO/OH ratio Eqivalent weight The reactions between Desmodur® and A simple way of calculating the equivalent Desmophen® or any other hydroxyl-bearing amounts of Desmodur® and Desmophen® is to compound is a chemical reaction. The mixing use the equivalent weights given for the sup- ratio is thus calculated from the number of ply forms being used. These can be found in funtional groups in the co-reactants. the relevant product information sheets or can be calculated in the following way: Desmodur®: 42 Desmophen®: 17 ______ x 100 _____ x 100 % NCO % OH 4 Basic principles The stoichiometric relationship of NCO/OH= The equivalent weight is a guide value. The 1:1 is established when 1 equivalent of quantity of Desmodur® required to provide Desmodur® is combined with 1 equivalent of a optimum results in a given application is best hydroxyl-bearing product, for example: determinated by trials. In practice, therefore, • Desmodur® L 75= more or less is used than the quantities calcu- NCO equivalent weight approx. 324, lated from the equivalent weights. These dif- • Desmophen® 1100= ferences are expressed by the NCO/OH ratio of OH equivalent weight approx. 262, the co-reactants used. The ratio for any In other words, the stoichiometric (100%) Desmodur®/Desmophen® combination can crosslinking of 262 g Desmophen® 1100 be calculated as shown below: requires 324 g Desmodur® L 75 . pbw. Desmodur® x 17 x % NCO NCO/OH ratio = __________________________ pbw. Desmophen® x 42 x %OH or pbw. Desmodur® x equivalent weight Desmophen® NCO/OH ratio = ___________________________________________ pbw. Desmophen® x equivalent weigh Desmodur® ® Desmodur The wide range of Desmodur® products is With the exception of MDI, the base mono- based on a comparatively small number of mers listet in the table cannot be used direct- monomeric isocyanates wich can be manufac- ly in the formulation of coatings because their tured on an industrial scale. high vapour pressure does not allow safe application in the context of industrial Abbreviations and Bayer code numbers for diisocyanates hygiene. Various methods can be used to manufacture products with a higher molecular weight and Type Abbreviation Code number* lower vapour pressure wich are safe to handle. Toluene diisocyanate TDI 1 For example, polyols can be added to form Diphenylmethane diisocyanate MDI 2 prepolymers, biurets can be formed or the di- isocyanates can be trimerized to form polyiso- Hexamethylene diisocyanate HDI 3 cyanurates. Isophorone diisocyanate IPDI 4 Fully hydrogenated MDI H12MDI 5 * first number in the Desmodur® nomenclature 5 Desmodur® Desmodur® – TDI-based % NCO Equivalent Visc. at 23°C Desmodur® Type Supply form (supply form) weight approx. mPa·s Isocyanate L75 TDI Adduct 75% in EA 13.3 315 L67 MPA/X TDI Adduct 67% in MPA/X, 1:1 11.9 350 L 67 BA TDI Adduct 67% in BA 11.9 350 L 1470 TDI Adduct 70% in EA 9.8 429 IL BA TDI Isocyanurate 51% in BA 8 525 IL EA TDI Isocyanurate 51% in EA 8 525 IL 1351 TDI Isocyanurate 51% in BA 8 525 IL 1451 TDI Isocyanurate 51% in BA 7.4 570 HL BA TDI/HDI Isocyanurate 60% in BA 10.5 400 HL EA TDI/HDI Isocyanurate 60% in EA 10.5 400 60% in E 1160 TDI Prepolymer 5.4 780 MPA/X, 1:1 40% in E 1240 TDI Prepolymer 3.4 1,235 MPA/X, 1.9:1 61% in E 1361 MPA/X TDI Prepolymer 6.8 620 MPA/X, 1:1 E 1361 BA TDI Prepolymer 61% in BA 6.8 620 E 1660 TDI Prepolymer 60% in BA 5.3 792 50% in E 1750 PR TDI Prepolymer 5.3 792 MPA/X, 1:3.5 E 14 TDI Prepolymer Solvent-free 3.3 1,270 E 15 TDI Prepolymer Solvent-free 4.4 950 6 The values given are non-binding average values. Valid supply tolerances are given in the product information sheets. TDI-based Visc. at 23°C approx. mPa·s Properties and applications 1,600 1,600 Standard crosslinker with broad range of applications, e.g. chemically resistant coatings, anti-corrosion coatings, industrial coatings, wood 600 and furniture finishes, concrete coatings 1,920 2,000 700 Very hard and very fast-drying coatings for wood, furniture and paper 1,600 250 Like Desmodur® IL 1351 but with improved compatibility 2,200 Very fast-drying coatings for wood, furniture, metal, plastic and paper with better elasticity than Desmodur® IL and better lightfastness 1,100 550 Elastic wood coatings, e.g. for parquet 160 Fast-drying parquet coatings 500 Fast-drying parquet coatings, anti-corrosion coatings 250 1,600 Combination resin for very fast-drying parquet coatings 375 Fast-drying parquet coatings 6,800 For the flexibilization of other Desmodur® E grades, elastic coatings and membranes 7,000 7 Desmodur® Desmodur® – MDI-based % NCO Equivalent Visc. at 23°C Desmodur® Isocyanate Type Supply form (supply form) weight approx. mPa·s VL MDI Polyisocyanate Solvent-free 31.5 133 VL 50 MDI Polyisocyanate Solvent-free 32.5 129 VL 51 MDI Polyisocyanate Solvent-free 32.5 130 VL R 10 MDI Polyisocyanate Solvent-free 31.5 132 VL R 20 MDI Polyisocyanate Solvent-free 31.5 132 VL R 21 MDI Polyisocyanate Solvent-free 31.5 132 VH 20 MDI Modified MDI Solvent-free 24.5 173 E 21 MDI Prepolymer Solvent-free 16 263 E 22 MDI Prepolymer Solvent-free 8.6 489 E 23 MDI Prepolymer Solvent-free 15.4 273 E 29 MDI Prepolymer Solvent-free 24 175 E 20100 MDI Prepolymer Solvent-free 15.9 268 The values given are non-binding average values. Valid supply tolerances are given in the product information sheets. 8 MDI-based Visc. at 23°C approx. mPa·s Properties and applications 90* Crosslinker for solvent-free coatings, sealants and membranes 23* Very low viscosity; same applications as Desmodur® VL but better compatibility with polyethers and lower reactivity; raw material for polyisocyanate prepolymers 21* 120* Higher reactivity than Desmodur® VL; for solvent-free spray coatings and membranes 200* Lower reactivity than Desmodur® VL R 20; 200* for solvent-free coatings and membranes 230* Crosslinker for very tough, elastic 2K coatings 5,400* Binder for coatings (e.g. for concrete and steel) and adhesives Binder for elastic aggregates (e.g. rubber granules); flexibilizing component 2,800 for other MDI-based Desmodur® grades 1,800 Low-viscosity binder for coatings (e.g. for concrete and steel) and adhesives Binder for solvent-free and low-solvent coatings for structural and 220 corrosion protection Injection resin for sealing water-conveying cracks in structures above and 1,100 below ground *Visc. at 25°C/approx. mPa·s 9 Desmodur® Desmodur® – HDI-based % NCO Equivalent Visc. at 23°C Desmodur® Isocyanate Type Supply form (supply form) weight approx.
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