Modified acrylic resins

The name is used also by ICI as an acronym for a range of modified acrylic resins. 

The use of FRP is desired to replace older materials of construction such as concrete, stucco, etc. They have been used in many historical preservation projects. The reason they are desired is because of light weight, durability ease of installation, and low maintenance (no dry rot, attack by insects, mold, etc.). These are typically nonstructural parts made by spray-up process or continuous panel process. An example are shown in Figure 23.11. This market is expected to continue to grow. The main resin used for exterior architectural applications are halogenated polyester resins. Since there is not a smoke requirement, resins that meet the ASTM E-84 flame spread requirement of <25 can be used for this application. The other common material used for these applications is polyester resin or modified acrylic resins that are filled with ATH. The ATH filled resins can also be used in interior applications since they will typically also have low smoke values. 

Manfredi, L. B., Rodriguez, E. S., Wladyka-Przybylak, M., and Vazquez, A. Thermal degradation and fire resistance of unsaturated polyester, modified acrylic resins and their composites with natural fibres, Polym. Degrad. Stabil. 2006, 91, 255-261. 

An epoxy-modified acrylic resin in n-butanol and xylol, sometimes with the addition of 2-ethoxyethanol. 

Table 1 shows the specifications of the concrete, carbon fiber sheet and adhesive resin investigated in the present work. The concrete blocks of 30 x 20 x 90 mm were made of normal grade Portland cement and cured in water for 4 weeks. The carbon fiber sheet (UT70-30, Toray) was a unidirectional cloth bound with a few lateral fibers. The adhesive resin (DK-530, Denka) was a modified acrylic resin of two component system. 

Modar. [ICI Acrylics] Modified acrylic resins for resin transfer molding, filament winding, hand lay-up, spray-up, pultrusion. 

Bonnets for mini excavators manufactured by Kobe Steel, Japan, are molded by RTM using a modified acrylic resin and glass fiber fabric. The 850 mm wide x 420 mm high component has double curvature and is molded with a glass fiber strand preform with surface mat on the outer surface, preformed with an organic binder. The resin system contains 100... 

Railway carriage interior components molded by RTM have been developed by Kobe Steel Europe with Transintech, UK, and Compin, France. A lightweight (5 kg) seat back shell with high static load and absorption capacity is molded in a modified acrylic resin (from Ashland) with a filler combination to achieve low fire, smoke and toxicity (FST) properties (which is easy to mold by RTM, with little effect on mechanical properties). A combination of glass fiber-based fabrics of 45° non-crimp (936 g/m ) with unidirectional reinforcement and continuous filament mat (450 g/m ) is used. 

Chem. Descrip. Ulfrafine fifanium dioxide (35%) disp. in Aromatic 100 (36%o), modified acrylic resin (29%)... 

Chem. Descrip. Modified acrylic resin (80%) in butyl acetate Uses Acrylic for ultra-high-solids two-pack industrial coatings, lacquers, thick-layer coatings, airless appliable paints Features Hydroxy-functional crosslinkable with polyisocyanates high gloss very good mech. props., chem. resist. ease of applic. Properties Hazen < 200 color dens. = 1.09 g/cm (20 C) dynamic vise. 

Chem. Descrip. Acetoacetate modified acrylic resin system in solvent (xylene)... 

Commercial impact-modified acrylic resins (Table 19.15) exhibit five- to tenfold improvement in the notched Izod impact strength and the ultimate tensile elongation compared to the neat PMMA resin. These impact-modified acrylics are usually blended captively by the manufacturers of the acrylic resins. The base resin in a typical weatherable grade (Plexiglas DR, Rohm and Haas) could be a methyl methacrylate copolymer with ethylacrylate and styrene, while the rubber additive (ca. 10 %) could be an emulsion-polymerized, PMMA-grafted, cross-linked poly (n-butylacrylate) rubber of controlled particle size (<200 nm). The nonweatherable impact-modified acrylic (XT, CYRO) typically consists of a MMA/S/AN copolymer with MBS (ca. 10 %) rubber particle dispersions. 

Modar Urethane-modified acrylic resin ICl Chem. Polym. 

A low viscosity, fast cure, modified acrylic resin for RTM and cold-press moulding application. 

Acrylic resins are not used in internal lacquers for metal decorating. However, epoxy modified acrylic resins are extensively used in DWI internals. These systems are waterborne and the methods used to make the resins waterborne have been reviewed in great detail in the epoxy volume of this series of books. 

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