Acrylic coating polymers durability

A majority of the acrylic emulsion polymers used in textile and non-woven applications are crosslinked or cured after film formation to provide wet stroigth, solvent resistance and durability to laundering and dry cleaning. As with architectural coatings binders, the principal monomers used are BA, EA and MMA,... 

Castellote M, Andrade C, Alonso C (2000) Electrochemictil removed of chlorides. Cem Concr Res 30(4) 615-621.doi 10.1016/S0008-8846(00)00220-9 Castelvetro V, Aghetto M, Ciardelli E, Chiantore O, Lazzari M, Toniolo L (2002) Structure control, coating properties, and durability of fluorinated acrylic-based polymers. J Coat Technol 74 57-66. doi 10.1007/BF02697984... 

Vinyl lacquers are used mainly where a high degree of chemical resistance is required these lacquers are based on vinyl chlorides and vinyl acetates. Acrylic lacquers are based on methyl methacrylate and methyl acrylate polymers and copolymers. Other esters of acrylic and methacrylic acid also may be used to make nonconvertible film formers. Judicious selection of these acrylic acid or methacrylic acid esters allows one to produce film formers with specifically designed properties such as hardness, flexibility, gloss, durability, heat, and chemical resistance. Acrylic lacquers, however, are not noted for their water resistance. The principal uses of acrylic-type lacquers are fluorescent and metallic paints, car refinish applications, clear lacquers and sealers for metals, and protective coatings for aircraft components and for vacuum-deposited metals, as well as uses in pigmented coatings for cabinets and appliances. 

Polymer supported 2-hydroxybenzophenones and 2-(2-hydroxyphenyl)-2ff-benzotriazoles have useful properties in articles used under high exposure of LTV U t, examples are transparent durable acrylic films, outdoor paints, transparent coatings for optical lenses, transparent protective layers of silver mirrors in solar concentrators or films used in encapsulation systems for photovoltaic modides in solar conversion devices [26, 54, 82, 92, 293]. Polymeric LS can also be used in cosmetics as sunscreening components of emulsions and ointments for protection of sensitive human skin against sunburn [324] or in medical aids, as nonleachable U V absorbing components of silicone rubber for vision aids (contact lenses) [99]. 

When acrylic polymers are added into a cement mortar mix, their spheres coalesce to form a continuous polymer matrix which coats the hydrating cement grains and aggregate. This polymer matrix acts as a barrier which helps to improve the hydration of the cement and also provides a polymeric network which increases the toughness and durability of the finished product. 

In summary, acrylic industrial coatings have been employed for almost half a century in applications where durability and resistance to the environment are paramount. Over the years, numerous chemical technologies have been developed to achieve specific properties. Because of their versatility and their inherent resistance properties, acrylic polymers have played a central role in the development of coating technology. The growth of new technologies for low-emission coatings has Increased this role even more. 

In a thermoplastic acrylic automotive coating, a CAB is used as the pigment dispersion medium and at 15% concentration based on polymer weight provides better sprayability, increased cold crack resistance, better pigment control, better solvent release, and improved exterior durability. (See Table IX.)... 

The superiority of acrylic polymers used for concentrating collector mirrors or lenses has been underlined [29]. Studies on reactivity of different polymers used as protective coatings or in film form for solar mirrors have established PMMA(3M)/Al/adhesive to be the most durable of the polymer/ mirror systems. 

The top-coats are responsible for the durability and resistance to water and chemical impacts from the environment. Mainly acrylic and fiuori-nated polymers are used for top-coats on various base coats (PVC, PUR, PTFE, silicone rubber, etc.) to enhance resistance to soiling and ageing. Certain additives for UV protection can be added. Due to its self-cleaning non-adhesive surface the top-coat is often hard and brittle. On PVC coatings the top-coat gives not only protection against environmental infiuences but also a barrier against emission of plasticizer out of the PVC. 

Adhesives in relation to coated fabrics can be thought of as either the tie-coat to bond the surface coating to the fabric, or the surface coating itself, directly bonded to the fabric. The types of polymers used in coating fabrics are rubbers, PVC, polyurethane, acrylics and silicones the coatings are usually cross-linked to increase durability but some topcoats can be thermoplastic, for example polyurethanes, to facilitate thermal bonding of seams in production of garments or other articles. 

More often the solvent-based coatings are made of alkyds, acrylics, PU or EP polymers. Alkyd-based polyols and unsaturated dibasic acids were the first synthetic polymers used in coating technology. It was successful in chemically combining oil or oil derived fatty acids into a polymer structure, thus enhancing the mechanical properties, drying speed and durability over and above those of the oils themselves and the oleoresins then available [61]. 

Coatings. Acrylic ester latex polymers are used widely as high quality paint binders because of their excellent durability, toughness, optical clarity, uv stability, and color retention. These properties allow acrylics to And use as binder vehicles in all types of paints (76) interior and exterior flats, semigloss, and gloss as well as primers to topcoats. Although all-acrylic compositions are most... 

Amino resins are also often used for the cure of other resins, snch as Alkyd Resins, and reactive acrylic poljmiers. These polymer systems may contain 5-50% of the amino resin and are commonly used in the flexible backings fonnd on carpets and draperies, as well as in protective surface coatings, particularly the durable baked enamels of appliances, automobiles, etc. 

Acrylic polymers are based on free radical initiated polymers containing monomers based on acrylic acid and methacrylic acid and their esters. Such polymers often also include styrene as a monomer. Acrylic-based coatings are more resistant to ultraviolet radiation and are widely used in applications where outstanding durability and color control are required. In recent years, hybrid coating systems are also being explored to satisfy more demanding performance needs for the coatings [52]. 

The characteristics of fluoropolymers are summarized in Table 1. Thermal and chemical resistance is in general with most of plastics, elastomers and perfluorinated membranes. Weather resistance with the outdoor durability for more than 20 years is specific for fluorinated paint resins. Surface properties such as water and oil repellency are provided by acrylic polymer-based textile finishes and coatings with long-chain per-fluoroalkyl groups. Electrical properties as well as a low refractive index are important for optoelectronics applications like optical fibers. 

---