Waterproof coatings

Some 500 years ago during Columbuss second voyage to what are now the Americas he and his crew saw children playing with balls made from the latex of trees that grew there Later Joseph Priest ley called this material rubber to describe its ability to erase pencil marks by rubbing and in 1823 Charles Macintosh demonstrated how rubber could be used to make waterproof coats and shoes Shortly there after Michael Faraday determined an empirical for mula of CsHs for rubber It was eventually determined that rubber is a polymer of 2 methyl 1 3 butadiene... 

The Kit Test (T-559 pm-96) can be used to measure oU repeUency when there is no physical barrier to oU penetration such as that provided by a film, foU, or waterproof coating (71). Another measure of oU repeUency is the Turpentine Test (T-454 om-89) (71). If a physical barrier is present, tests that measure the weight of oU pick-up or show-through under conditions that simulate the end use are appropriate. 

Emulsion paint is easy to apply, aesthetically good looking, and forms a hard wearing and waterproof coating. Like milk in the previous example, the paint comprises one phase dispersed within another. It is a colloid, but this time a liquid finely dispersed in another liquid, which we call an emulsion. 

Other uses for depolymerized PET bottles have been investigated. Used bottles have been glycolized and then used to make unsaturated polyester thermosets and polyol components in rigid polyurethane foam. Evco Research announced in 1999 its EvCote waterproof coatings and adhesives based on recycled PET [17, 18]. 

Locust-gum. Proposed as a waterproofing coating for AN grains in so-called water-resistant expls... 

Safety fuse A waterproof coated, thread-wrapped cord filled with black powder designed for initiating a nonelectric blasting cap. 

Exemplary water-repellent treatments for masonry surfaces include metal stearates, oils, waxes, acrylates (both polymers and monomers), silicones (solvent-based and emulsion), siliconates, silanes and, fluorochemicals. In contrast, to waterproofing coatings, water-repellent coatings, because they are permeable to water vapor, do not trap moisture and, therefore they can reduce spalling. In addition most water-repellent coatings do not alter the appearance of a porous masonry. 

CA 53,7598(1959) [Flexible detong fuses, constg of a core(2.85g) of PETN or RDX 0.15g of Na carboxymethylcellulose or Na alginate per ft of fuse, are enclosed in a paper tube and wound with jute cotton yarn. A coating of wax or bitumen at 100° a waterproof coating of polyethylene are then/applied 249)H.P. Jenkins s/c.H.Shomate,USP 2865726(1958) ... 

Thomas Hancock (1786-1865) and Charles Macintosh (1766-1845) a chemist dissolved natural rubber in naphtha obtained by the fractional distillation of coal tar. They, then dipped ordinary cloth in this rubber solution to produce waterproof cloth for making coats. This waterproof coat came to be known as Mackintosh . 

Use as a waterproof coating for inside or outside tanks, basements, and utility substations... 

Natural rubber is isolated from a white fluid, called latex, that exudes from cuts in the bark of Hevea brasiliensis, the South American rubber tree. Many other plants secrete this polymer, as well. The name rubber was first used by Joseph Priestly, who used the crude material to rub out errors in his pencil writing. Natural rubber is soft and sticky. An enterprising Scotsman named Charles Macintosh found that rubber makes a good waterproof coating for raincoats. Natural rubber is not strong or elastic, however, so its uses were limited to waterproofing cloth and other strong materials. 

Perilla oil has been used as a drying oil in paints, varnishes, linoleum, printing ink, lacquers, and for protective waterproof coatings on cloth. It has also been used for cooking and as fuel (56). The meal produced after oil extraction is often used as an animal feed ingredient. 

Foam furniture cushions, waterproof coatings, parts of shoes... 

Low-fired clays differ widely as to their hygroscopic capacity and the temperature at which they release the moisture thus absorbed. At the same time, the expulsion of this moisture requires considerable time. Therefore, it is not sufficient simply to keep the crucibles in a warm place, but they should be finally maintained for at least several days at a higher temperature, say 150 C., before being placed in the furnace. In Europe the crucibles on being taken from this kiln are sometimes covered with a waterproof coat, such as tar or pitch dissolved in turpentine. 

Use For film clarity, flexibility, abrasion, and water resistance for use in primers, structural hot-metal adhesives, inks, and waterproof coatings. 

Use Acid, alkali, and waterproof coatings black varnishes, lacquers, baking enamels, and japans wire-insulation compounds linoleum and floor tile paving insulation diluent in low-grade rubber compounds possible source of gasoline, fuel oil, and... 

Allguard. [Dow Gxning] Elastomeric waterproof coating for masonry, con-scruction, stucco, stone. 

This fuse does not have a waterproof coating and it must be tested by burning a measured length before actual use. 

Paraffin-like, crystal substance at low temp, mp about 20. USE Waterproof coatings, polishes, face creams, rouges, ointments, soaps, rubber manuf, dye solns, inks, lubricants. 

Natural rubber is a polymer of 2-methyl-l,3-butadiene (isoprene Section 26.6). On average, a molecule of mbber contains 5000 isoprene units. All the double bonds in natural rubber are cis. Rubber is a waterproof material because it consists of a tangle of hydrocarbon chains that have no affinity for water. Charles Macintosh, a Scotsman, was the first to use mbber as a waterproof coating for raincoats. 

Diatomaceous earth is a dust that scratches the waterproof coat of cockroaches and other crawling insects, causing them to dry out and die. 

Waxes are solids that furnish waterproof coatings on leaves and fruit and on the skins and feathers of animals. Waxes are also important commercially. For example, whale oil is largely composed of the wax cetyl palmitate. It has been used in so many products, including cosmetics and candles, that the blue whale has been hunted almost to extinction. 

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