Water paints

Poly(vinyl acetate) is used in latex water paints because of its weathering, quick-drying, recoat-ability, and self-priming properties. It is also used in hot-melt and solution adhesives. 

Organosulfur Compounds. These compounds, Hsted in Table 8, are used in a variety of appHcations, including cooling water, paint, and metalworking. Methylenebisthiocyanate hydroly2es rapidly at a pH above 8 to cyanate ion which complexes with ferric iron to poison the cytochrome systems (36). 

When the problem is to disrupt Ughtly bonded clusters or agglomerates, a new aspect of fine grinding enters. This may be iUustrated by the breakdown of pigments to incorporate them in liquid vehicles in the making of paints, and the disruption of biological cells to release soluble produces. Purees, food pastes, pulps, and the like are processed by this type of mill. Dispersion is also associated with the formation of emulsions which are basically two-fluid systems. Syrups, sauces, milk, ointments, creams, lotions, and asphalt and water-paint emulsions are in this categoiy. 

Paints used for protecting the bottoms of ships encounter conditions not met by structural steelwork. The corrosion of steel immersed in sea-water with an ample supply of dissolved oxygen proceeds by an electrochemical mechanism whereby excess hydroxyl ions are formed at the cathodic areas. Consequently, paints for use on steel immersed in sea-water (pH 8-0-8-2) must resist alkaline conditions, i.e. media such as linseed oil which are readily saponified must not be used. In addition, the paint films should have a high electrical resistance to impede the flow of corrosion currents between the metal and the water. Paints used on structural steelwork ashore do not meet these requirements. It should be particularly noted that the well-known structural steel priming paint, i.e. red lead in linseed oil, is not suitable for use on ships bottoms. Conventional protective paints are based on phenolic media, pitches and bitumens, but in recent years high performance paints based on the newer types of non-saponifiable resins such as epoxies. 

Fig. 18.2 Water paint sample with immobilized silver nanoparticles...

Water paints were impregnated with nanosized silver colloids. Most of initial silver nanoparticles agglomerated into up to 200-nm clusters as a result of attractive interaction forces between the particles (Fig. 18.2). 

Antibacterial and antifungal effects of nanosilver-based water paint are summarized in Table 18.2... 

Increase of the nanosilver concentration in water paint up to 5-6 pgcm" suppressed B. subtilis and E. coli growth. On the other hand larger concentrations of nanosilver can potentially lead to undesirable color change of the water paint with time. 

Table 18.2 Antimicrobial effect of samples of water paint impregnated with nanosilver...

Silver nanoparticles synthesized by a cost-effective three-stage electrochemical technique have demonstrated great promise as antimicrobial agents. Nanosilver was less effective against E. coli, S. aureus, B. subtilis and P. phoeniceum compared to silver ions. However silver nanoparticles have prolonged bactericidal effect as a result of continuous release of Ag ions in sufficient concentration and thus nanoparticles can be more suitable in some bactericidal applications. The synthesized silver nanoparticles added to water paints or cotton fabrics have demonstrated a pronounced antibacterial/antifungal effect, despite the fact that they tend to agglomerate into clusters up to 200 nm. 

PAINT PAPER WITH IODINE. DISSOLVE A FEW CRYSTALS OF SODIUM THIOSULFATE ( HYPO ] IN WATER. PAINT WITH THIS SOLUTION OVER THE BROWN COLOR. YOU WILL GET WHITE LETTERS AS HYPO FORMS COLORLESS COMPOUND WITH IODINE. 

The ancient Egyptians were adept at creating water paints, which were used to decorate the interiors of their pyramids, temples, and palaces. Much like the cave painters paints, their colors were earth tones—yellow ochre, sienna, red, black, and white—but two new colors were added blue and green. Later, between A.D. 117 and 161, the early Christians in Egypt made paints of pigment particles suspended in hot beeswax. Their works, called encaustic paintings, are still well preserved and brilliant in color. In the eighth century, the Phoenicians obtained a vibrant purple dye from a particular kind of oyster. 

Egg tempera was used as a paint medium at least as early as the fourteenth century. It was the dominant medium in Europe until the development of oil paint. In egg tempera, powdered pigment is bound with egg and water. Paint is applied layer upon layer, imparting a luminous quality unlike any other paint medium. The advantages and disadvantages of egg tempera are about equal ... 

Used in plasters, cements, mortars, water paints, dehairing hides, and as an insecticide... 

U.S. Navy Combination of down-flow and transpiring wall reactors Black water, gray water, paint, solvent, oil, etc. 40 g/s... 

Chlorinated System parameters or results Fluorochlorocarbon solvent Motor oil Gray water Paint waste Lube oil Photographic solution... 

Is the trade name for pyrophyllite, a hydrous aluminum silicate. This mineral is chemically a clay but has the appearance and some of the physical properties of talc. The principal use is as a diluent or carrier for agricultural toxicants, PYRAX is also used in water paints, dry wall plasters and as a filler for plastics. 

So it s chalk, water, paint, seaweed, antifreeze, paraffin oil, detergent, peppermint, formaldehyde, and fluoride (which can go some way towards preserving children s teeth)—that s the usual mixture raised to the mouth on the toothbrush for a fresh morning s clean. If it sounds too unfortunate, take heart. Studies show that thorough brushing with just plain water will often do as good a job. 

Use Emulsifying agents for polishes, textile specialties, leather compounds, insecticides, cutting oils, and water paints. 

Use Latex water paints adhesives for paper, wood, glass, metals, and porcelain intermediate for conversion to polyvinyl alcohol and acetals sealant shatterproof photographic bulbs paper coating and paperboard bookbinding textile finishing non-woven fabric binder component of lacquers, inks, and plastic wood strengthening agent for cements. 

The increasing demand for solvent-free paints led to the introduction of water-based paints. Both in the production and in the application of this type of paint quite often a water-paint waste mixture results. Two examples are leftovers, diluted with (cleaning) water and water used in water curtains in spray booths, which becomes increasingly contaminated with paint. Using ceramic membranes with pore sizes of 0.1 micron [35], it is possible to concentrate the paint particles to a very high degree (35-65% dry matter) and at the same time produce an effluent containing less than 0.1% paint. This can be... 

A sol is a fluid colloidal system in which fine solid particles are dispersed in a liquid medium. Most household paints are sols with finely ground pigments mixed with acrylic resins dissolved in water. Paint is applied to a surface as a liquid. 

USE In mortar, plaster, cement and other building and paving materials in lubricants, drilling fluids, pesticides, fireproofing coatings, water paints as egg preservative manuf of paper pulp in SBR rubber vulcanization in water treatment dehairing hides. 

USE As water-soluble lubricants for rubber molds, textile fibers, and metal-forming operations. In food and food packaging. In hair prepns, in cosmetics in general. Pharmaceutic aid (ointment and suppository base). As a stationary phase in gas chromatography. Also in water paints, paper coatings, polishes and in the ceramics industry. Caution Solvent action on some plasticsl... 

USE For preserving eggs fireproofing fabrics as a detergent in soaps as adhesive waterproofing walls in cements in cold-water paints manuf of abrasive wheels weighting silk, etc. 

USE Dusting powder, either alone Or with starch or boric acid, for medicinal and toilet prepns excipient and filler for pills, tablets and for dusting tablet molds clarifying liquids by filtration. As pigment in paints, varnishes, rubber filler for paper, rubber, soap in fireproof and cold-water paints lor wood, metal and stone lubricating molds and machinery glove and shoe powder electric and heat insulator. 

OTHER COMMENTS used as a white pigment in exterior house paints, interior air-dry and baked enamels and lacquers, inks and plastics, in water paints, leather finishes, shoe whiten-ers, and ceramics rutile sand is suitable for coating welding rod materials rutile-like pigments are also useful as opacifying agents other uses include the manufacturer of cosmetics, food color additives, and synthetic diamonds. 

Kaolin and alumina suspensions are also, in some cases, included in water paint formulations. It has been shown in [193] that a maximum shear yield stress is observed with AKP-30 alumina suspensions of a mean primary particle diameter of ca. 0.3 pm at pH 9, independent of the particle volume fraction between 0.2 - 0.3. For kaolin suspensions, the maximum shear yield stress is observed at pH 6 independent of the solid volume fraction. A direct correlation with the electrokinetic potential is observed. Thus, the pair-wise particle interaction is due to the electrostatic interaction which allows to control the stability of these suspensions. 

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