Lacquers acrylics

In recent years there has been an increased interest in cellular leathercloth using modified spreading techniques. In some leathercloth formulations the surface has an undesirable tackiness. In such cases this can be overcome by applying a PVC-acrylic lacquer. 

If a motor car has to be refinished after repair, commonsense suggests that the original finishing system would be ideal for maintenance of protection and durability. However, with tyres, upholstery, fabric and plastic trim fitted and petrol in the tank, the use of such high stoving temperatures is not practical. The practical upper temperature limit is 80°C. This means that none of the original materials is suitable, not even the acrylic lacquer, since this is designed to be sanded and the scratches reflowed at 155 C. 

Two of these types are lacquers, giving quick drying to the dust-free state at ambient temperature, but at the expense of lower film build. Nitrocellulose-based lacquers are preferred in some European countries and acrylic lacquers in North America. Nitrocellulose is plasticised with nondrying alkyds, polyester and liquid plasticiser. Acrylics are plasticised internally by use of plasticising monomers with methyl methacrylate and by solvent plasticiser. Acrylics give better durability and nitrocellulose gives easier application. 

With these lacquers, nitrocellulose-based primer-surfacers are used. As well as liquid plasticisers, a wide range of materials are used as plasticising resins short oil alkyds, maleinised oils, ester gum, rosin and bodied castor oils. Pigmentation is usually inert. Thermoplastic acrylics are often preferred under acrylic lacquers these are based on acrylic resins and cellulose acetate butyrate. 

These requirements are usually met with two-pack paints based on hydroxyl-rich polyester or acrylic resins in the pigmented pack and aliphatic polyisocyanates in the activator pack. Cure with this type of finish is relatively fast and complete even at low ambient temperatures. An alternative finish is an acrylic lacquer, similar to the lacquer used for refinishing motor cars. These finishes are applied to the assembled aircraft by operators protected by air-fed hoods and using airless or conventional spray guns. High durability pigments are included. 

The pits are generally embossed into the substrate (polycarbonate or polymethylmethacrylate) layer by an injection-molding process, and are used to indicate whether a data bit is 0 or 1. An aluminum or silver layer provides a reflective surface, and is protected from corrosion and damage by a radiation-cured acrylate (lacquer) layer, onto which a label is usually printed.197... 

Atmospheric corona discharge has been used to increase the surface energy of wood surfaces by oxidative activation (Back and Danielsson, 1987). Improved bonding of a water-based acrylate lacquer was found following corona treatment of the wood surface, with no improvement found when a solvent-based alkyd system was used. 

UVC Lacquer and Test. A white epoxy-acrylate lacquer was applied on all nickel plated sheets with different pretreatments to a thickness of 16 ym and was cured by irradiation with four 10-kW ultraviolet lamps for about 1.2 sec. 

A layer of transparent lacquer or PVC plastisol may be superimposed as desired to protect print and to control the gloss of the finish. A vinyl-acrylic lacquer may be applied in tandem with colour printing or, say, a clear plastisol coating by screen printing, usually in the last stage as the material passes to the oven for fusion and expansion. 

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. 

Acrylics. Acetone is converted via the intermediate acetone cyanohydrin to the monomer methyl methacrylate (MMA) [80-62-6]. The MMA is polymerized to poly(methyl methacrylate) (PMMA) to make the familiar clear acrylic sheet. PMMA is also used in molding and extrusion powders. Hydrolysis of acetone cyanohydrin gives methacrylic acid (MAA), a monomer which goes direcdy into acrylic latexes, carboxylated styrene—butadiene polymers, or ethylene—MAA ionomers. As part of the methacrylic structure, acetone is found in the following major end use products acrylic sheet molding resins, impact modifiers and processing aids, acrylic film, ABS and polyester resin modifiers, surface coatings, acrylic lacquers, emulsion polymers, petroleum chemicals, and various copolymers (see Methacrylic acid and derivatives Methacrylic polymers). 

TSE-WB is used only by General Motors at three of its U.S. plants. This operation was decreed by the EPA as the best available technology (BAT) at that time. GM does not plan to introduce TSE-WB at any other of its assembly plants—primarily because of the high cost of equipment and the environmental changes required. GM continues to use acrylic lacquers at their other plants—but will be moving to HS-E by 1985. This will be a major move for GM—going away from their traditional TPL. 

Metallie Tc foils of 23 pm thickness and 15 x 20 cm surface coated with a thin layer of acryl lacquer were used for /1-radiography [3], In the determination of heavy elements by X-ray fluorescence. Tc was proposed as radiation source for the excitation of the X-fluorcscence radiation [4]. In addition, Tc was considered as radiation source for ionization detectors in gas chromatography [5]. 

The compact audio disc (CD) based on digital recording and playback technology is 4.75 in. in diameter and can store 16 million bits of information in the form of minute pits in the substrate. It is the presence or absence of the pits that is read by the laser. The pits are 0.1 pm deep, 0.5 pm wide, and between 0.833 and 3.56 pm long. Each track comprises a spiral of these pits. The track is laid in polycarbonate that is backed with reflective aluminum and coated with a protective acrylic lacquer. The CD can thus be played only on one side. 

Chem. Descrip. Acrylic lacquer, mildly alkaline, water-based sol n. 

Chem. Descrip. Zinc phosphate pigment CAS 7779-90-0 EINECS/ELINCS 231-143-9 Uses Corrosion inhibitor, pigment for aikyds, water reducible epoxies and aikyds, latex emulsions, epoxy esters, acid catalyzed systems, acrylic lacquer emulsions, vinyiidene chloride systems, polyesters, thin film applies., high gloss systems... 

Uses Defoamerfor inks, coatings, trade sales, industrial acrylic lacquers, epoxy water-based systems, PVAc, polyester, urethane systems Regulatory DSL listed... 

Uses Solvent in coil, container, and automotive coatings, printing inks, acrylic lacquers, enamels, surf, primers for epoxies and polyesters, paint strippers, foundry core binders, resin cleanup, intermediates, industrial cleaners, wire enamel resins Features Offers VOC compliance, noncorrosive Regulatory DOT nonregulated SARA 302, 313 nonreportable Properties APHA 50 max. sweet odor sol. in alcohols, esters, glycol ethers, halogenated soivs., ketones, hydrocarbons sol. 5.5% in water m.w. 160 sp.gr. 1.086 dens. 9.06 Ib/gal vise. 3.88 cps f.p. -40.2 C b.p. 200-220 C acid no. 0.1 flash pt. (PMCC) 102 C surf. tens. 35.4 dynes/ cm 0.1% max. water content... 

Chem. Desaip. Syn. amorphous silica CAS 112926-00-8 EINECS/ELINCS 231-545-4 Uses Flatting agent for coalings incl. trade sales urethane varnishes, acrylic and NC lacquers, water-based acrylic lacquers, clear alkyd urea varnishes... 

Uses Corrosion inhibitor for coatings composite pigment for alkyds, epoxies, epoxy esters, acrylic lacquers, polyesters, vinylidene chloride systems... 

Bulrol 9106 Butrol 9107 corrosion inhibitor, acrylic lacquer emulsions... 

Diphenyl octyl phosphate Santicizer 141 flatting agent, aq. acrylic lacquers ... 

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