Paint constituents solvents

A useful property of liquids is their ability to dissolve gases, other liquids and solids. The solutions produced may be end-products, e.g. carbonated drinks, paints, disinfectants or the process itself may serve a useful function, e.g. pickling of metals, removal of pollutant gas from air by absorption (Chapter 17), leaching of a constituent from bulk solid. Clearly a solution s properties can differ significantly from the individual constituents. Solvents are covalent compounds in which molecules are much closer together than in a gas and the intermolecular forces are therefore relatively strong. When the molecules of a covalent solute are physically and chemically similar to those of a liquid solvent the intermolecular forces of each are the same and the solute and solvent will usually mix readily with each other. The quantity of solute in solvent is often expressed as a concentration, e.g. in grams/litre. 

Solvent a liquid, usually volatile, which is used in the manufacture of paint to dissolve or disperse the film-forming constituents, and which evaporates during drying and therefore does not become a part of the dried film. Solvents are used to control the consistency and character of the finish and to regulate application properties. 

Apart from paints, electrokinetic separations find limited application for synthetic polymers [905], mainly because of solvent compatibility (CE is mostly an aqueous technique) and competition of SEC (reproducibility). Reasons in favour of the use of CE-like methods for polymer analysis are speed, sample throughput and low solvent consumption. Nevertheless, CE provides some interesting possibilities for polymer separation. Electrokinetic methods have been developed based on differences in ionisation, degree of interaction with solvent constituents, and molecular size and conformation. 

The solvents encompass 36.7 wt% of the paint sample. The solvent appears to be consistent with a mixture of a VM P naphtha with toluene. Toluene is the major constituent. 

The basic constituents in a self-polishing antifouling paint are 1) the binder system, 2) the biocides and pigments and 3) the solvents. 

Uses Determining refractive index of minerals paint diluent dyed hexane is used in thermometers instead of mercury polymerization reaction medium calibrations solvent for vegetable oils alcohol denaturant chief constituent of petroleum ether, rubber solvent, and gasoline in organic synthesis. 

When polymers are used as constituents of coatings, paints, and lacquers, they require solvents as dispersing agents. Whether true solutions are formed or emulsions, the solvents used have to conform to environmental specifications, but should be sufficiently volatile so as to permit rapid drying of the applied polymer and pigment, if present. One should examine chapter 6 and the appendix for green examples of coatings solvents. 

The cleaning solvent is tested for its capacity to dissolve paints. The recycled solvent will require some analyses to allow an estimation of the required amounts of different constituents that need to be added in order to reformulate the fresh solvent. 

In xylene mixtures (15-20%) paint industry insecticide sprays petrol blends production in the styrene and acetophenone, solvent constituent of asphalt and naphtha 3511,3512,3521 354,38... 

Use and exposure Toluene is a clear, colorless liquid with an aromatic odor. It is a natural constituent of crude oil and is produced from petroleum refining and coke-oven operations. It is used in household aerosols, nail polish, paints and paint thinners, lacquers, rust inhibitors, adhesives, and solvent-based cleaning agents. Toluene is also used in printing operations, leather tanning, and chemical processes. Benzene and other PAHs are common... 

Finally, another halogenated solvent that causes toxic effects after acute exposure is dichloromethane or methylene chloride. It is used for degreasing engines and metalwork, and is the main constituent of paint stripper. If it is used in confined, enclosed spaces, such as rooms without adequate ventilation, it can lead to serious, unexpected toxic effects. As the solvent is breathed in by the worker it becomes localized in body fat. Later the... 

Solvents are volatile liquids added to dissolve or disperse the filmforming constituents of paints and allied products. They evaporate during the drying, and therefore, do not become a part of the dried film. In brief they... 

Linseed oil and tung oil, important constituents of paints, are esters (Sec. 33.6) derived from acids that contain two or three double bonds per molecule 9,12-octadecadi-enoic acid, for example. On exposure to air, paint forms a tough protective film oddly enough, after the initial rapid evaporation of solvent, this drying of paint is accompanied by a gain in weight. What kind of process do you think is involved Be as specific as you can be. 

Series of chromatograms showing the separation of black ink. Chromatography is an analytical process, which separates a compound into its constituent chemicals. Chromatography paper is dipped vertically in a solvent with the ink painted on it (left). Capillary action draws the solvent up through the paper (center) and dissolves the ink. As the solvent travels up the paper, it takes the various chemicals in the ink with it, separating them into a series of colored bands. (Courtesy of Andrew Lambert Photography/ Science Photo Library)... 

OTHER COMMENTS used in the manufacture of benzoic acid, benzaldehyde, explosives, dyes, and many other organic compounds used as a solvent for paints, lacquers, gums, and resins used in cements, solvents, spot removers, cosmetics, antifreezes, and inks a constituent of asphalt and naphtha also used in fuel blending. 

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