Paint stripper

One of the chief uses of chloromethane is as a starting material from which sili cone polymers are made Dichloromethane is widely used as a paint stripper Trichloromethane was once used as an inhalation anesthetic but its toxicity caused it to be replaced by safer materials many years ago Tetrachloromethane is the starting mate rial for the preparation of several chlorofluorocarbons (CFCs) at one time widely used as refrigerant gases Most of the world s industrialized nations have agreed to phase out all uses of CFCs because these compounds have been implicated m atmospheric processes that degrade the Earth s ozone layer... 

Uses. Tetrahydrofurfuryl alcohol is of interest in chemical and related industries where low toxicity and minimal environmental impact are important (134). For many years tetrahydrofurfuryl alcohol has been used as a specialty organic solvent. The fastest growing appHcations are in formulations for cleaners (135) and paint strippers (136), often as a replacement for chlorinated solvents (137). Other major appHcations include formulations for crop sprays, water-based paints, and the dyeing and finishing of textiles and leathers. Tetrahydrofurfuryl alcohol also finds appHcation as an intermediate in pharmaceutical appHcations. 

Exxate Solvents are Setting the Pace in Paint Strippers, Exxon Chemicals, 1989, p. 3. 

Eor use in paint strippers, one of its first appHcations, methylene chloride is blended with other chemical components to maximi2e its effectiveness against specific coatings. Typical additives include alcohols, acids, amines or ammonium hydroxide, detergents, and paraffin wax. Paint stripping formulations without methylene chloride have not as yet been shown to be as effective as those with methylene chloride. 

Other apphcations for the diesters of the diacids are known. Du Font s Di-basic Ester (DBE) is an effective industrial cleaning solvent and paint stripper. DBE is marketed as an environmentally superior substitute to the chlorinated solvents (105). 

A liquid not considered flammable may still have an explosive potential. An example is dichloromethane or methylene chloride, often used in paint strippers, which evaporates very quickly. It is not flammable, but its vapors may be explosive (explosive limits 12% to 22%). 

Paint strippers may give rise to hydrogen entry into steel, and in critical applications, such as the treatment of aircraft components, commercial paint strippers should be tested before use. 

The fact that very low concentrations of polymer give highly viscous solutions is exploited commercially in a number of applications. The thickening action of polymers is often necessary for water-based substances, such as foods, toothpastes, or emulsion paints, but examples also occur of the use of polymers to thicken solvent-based products, such as paint stripper. 

Paint strippers are also formulated to have high viscosity, otherwise they run off vertical surfaces and thereby fail to penetrate or solubilise the paint to which they have been applied. Hydroxypropyl methylcellulose is the main thickener for paint strippers, which use methylene chloride (dicldoromethane) as the principal component. Hydroxypropyl methylcellulose is useful for this purpose because it is soluble in the orgaiuc component but is not sensitive to the presence of any water that may also be present in the paint stripper. 

Trichloroethylene is an excellent extraction solvent for greases, oils, fats, waxes, and tars and is used by the textile processing industry to scour cotton, wool, and other fabrics (lARC 1979 Kuney 1986 Verschueren 1983). The textile industry also uses trichloroethylene as a solvent in waterless dying and finishing operations (McNeill 1979). As a general solvent or as a component of solvent blends, trichloroethylene is used with adhesives, lubricants, paints, varnishes, paint strippers, pesticides, and cold metal cleaners (Hawley 1981 lARC 1979 McNeill 1979). 

These incombustible substances are halogenous derivatives whose extinction properties are well known and some molecules were used as extinction agents before it was realised they were toxic. Paint stripper containing methanoi and dichloromethane... 

In this paper, we focus on synthesis and application of esters of bio-based organic acids. Organic acid esters are used or have potential for use in many industrial and consumer applications including solvents, paint strippers, surfactants, fragrances, and fuel stabilizers2. The chemicals used in these... 

Also known as DCM or dichloromethane. Often used as an adhesive solvent for acrylics. Pure DCM can be found in craft stores. DCM must be distilled first from all non-flammable paint strippers beforehand (they contain a paste that holds several unwanted substances.) The paint stripper may also contain methanol (most marine grade paint strippers are 80-90% DCM. Methanol is also an organic solvent. DCM distills at 47° C or 116° F. Pure DCM is best. May cause cancer and blindness. Take necessary precautions. Methylene chloride sinks to the bottom of the jar. 

Trisodium phosphate (TSP), Na3P04, is used as a paint stripper and grease remover. Disodium hydrogen phosphate, Na2HP04, can be found in some laxatives. Draw a Lewis structure for each molecule, and determine the shape of the phosphate ion,... 

Methylene chloride-based paint strippers Other inhibitors include antimycin (cytochrome We ), doxorubicin (CoQ), and oligomydn (Fp). 

Innovation drivers Alternative paint strippers have been developed as a consequence of the chlorine debate . However, neither the detailed requirements related to occupational health and safety (TRGS 612 and 212) nor the lower efficiency (cf (3)) clearly supported the penetration of the market with the alternative paint stripping systems. One barrier may be that the users have to change their work and purchasing procedures to apply the alternatives successfully. By end of the nineties the construction employers liability insurance started, based on the public media, an information campaign about the risks of DCM-containing paint strippers. 

Examples, which back np this theory, are the success of the Okotex 100 standard, the relative failine of the GISCODE system for paint-strippers and also the very limited snccess of biodegradable monld release agents in the construction in-dnstiy. 

Paint stripper Paint pretreatment Polyester paint Polyurethane coating Metallizing... 

S Solvents Except for the direct use of CH2CI2 in equipment cleanup, most paint strippers sold are formulated products. Solvent-based strippers commonly employ a number of components that each accomplish a given task or function. The first component is a primary solvent that serves to penetrate the paint film and promote swelling. Cosolvents may also be used to increase the rate of penetration and to keep the varions components from separating. 

Other paint stripper ingredients include surface-active agents (surfactants), emulsifiers, thickeners, sealants, and corrosion inhibitors. Thickeners such as methyl cellulose derivatives are used to thicken the stripper so that it can be brushed onto vertical surfaces. Sealants snch as crude or refined paraffin act to retard evaporation of the CH2CI2 so that the stripper remains effective over a long period of time. 

A large do-it-yourself consumer population uses paint strippers containing dichloromethane on furniture and woodwork. Formulations are available mainly in liquid form, but also, occasionally, as an aerosol. Exposures have been estimated on the basis of investigations of the use of household liquid products in the United States. The estimated levels ranged from less than 35 mg/m- to a few short-term exposures of 14 100— 21 200 mg/mC The majority of the concentration estimates were below 1770 mg/ni (WHO, 1996). 

Gluconates and glucoheptonates are essential components of many alkaline rust removers and cleaners, paint strippers, and etchants. They frequently cause complexation of dissolved heavy metals such as copper, nickel, and zinc. Conventional sodium hydroxide treatment does not result in sufficient precipitation of these complexed metals to meet EPA standards. In tests performed by Srinivasan (1983), the use of lime or calcium hydroxide proved far better. In particular, lime treatment resulted in more metal removal, better flocculation and faster sludge settling, and could also be used in conjunction with sodium hydroxide treatment. 

Paint strippers -methylene chloride use [CHLOROCARBONS AND CHLOROHYDROCARBONS - METHYLENE CHLORIDE] (Vol 5)... 

---