Coated abrasive varnish

In pigmented coatings, phenolic varnishes find use as vehicles for porch and deck paints where moisture and abrasion resistance are of utmost importance. Their moisture resistance and good metal adhesion make them useful vehicles for metal primers. In concrete paints they outperform most other oil-containing vehicles due to their better alkali resistance. 

Chem. Descrip. 141° Paraffin emulsion CAS m2-lA-2 EINECS/ELINCS 232-315-6 Uses Lubricant, antiblocking agent, water resist, aid in nat. and syn. mbber, paints, coatings, and varnishes improves banier props., water repellency, MVTR props., rub/scuff/abrasion/mar resist, in latex coatings, printing inks, medical devices Features Usable pH 7+ low VOC Regular FDA compliance... 

The first coated abrasive made goes back to the 13th Century, when the Chinese used crushed seashells as an abrasive grain and bonded them to parchment paper with natural gums. Other forms of coated abrasives were made by applying abrasive minerals to animal skins, leather, etc., and as time passed, animal hide glues and varnishes were used to bond grain to paper and cloth. 

The first commercial applications of polypyromellitimides were as wire enamels, as insulating varnishes and for coating glass-cloth (Pyre.ML, Du Pont). In film form (Kapton) many of the outstanding properties of the polymer may be more fully utilised. These include excellent electrical properties, solvent resistance, flame resistance, outstanding abrasion resistance and exceptional heat resistance. After 1000 hours exposure to air at 300°C the polymer retained 90% of its tensile strength. 

A surface coating protects the substrate against abrasion, moisture, light, and corrosion. The binder for the pigment and extenders is fluid before application and rigid soon after. Natural binders range from gum arable to fish oil. The first varnishes were solutions of natural resins, having transparency, hardness, amorphous structure, and little permanence. 

Phenolic novolacs, 18 760-761 Phenolic resin adhesives, 18 783-784 Phenolic resin can coatings, 18 38 Phenolic resin composites, 18 792-794 Phenolic resin drying-oil varnishes, 18 783 Phenolic resin fibers, 18 797-798 mechanical properties of, 18 798 Phenolic resin foam, 18 795-796 Phenolic resin manufacturers, U.S., 18 774 Phenolic resin polymerization, 18 760-765 alkaline catalysts in, 18 762-765 neutral catalysts in, 18 761-762 strong-acid catalysts in, 18 760-761 Phenolic resin prepregs, 18 793 Phenolic resin production unit, 18 766 Phenolic resins, 10 409 18 754-755, 756-802 22 10 26 763 in abrasive materials, 18 786-787 in air and oil filters, 18 790 additional reactants in, 18 759 analytical methods for, 18 774-779 applications of, 18 781-798 batch processes for, 18 766 from biomass and biochemical processes, 18 769-770... 

Rigid foams are excellent insulators, even better than polystyrene, and are used in refrigerators and refrigerated trucks and box cars. Polyurethane coating materials are popular additives to marine finishes and varnishes, particularly for gymnasium floors, bar tops, and other surfaces that take an abusive, abrasive beating. 

Khrushchev (1957) considers that the need to measure the force T has not been sufficiently well substantiated, nor has a sufficiently precise and easy in service hardness tester been developed yet for determinations of this type. However, he appreciates the usefulness of scratch hardness tests, especially at low loads, as a non-destructive technique. He recommends these methods as very useful for hardness determination of metallic layers or of materials exposed to abrasive wear under operating conditions (plastics, organic coatings, such as varnishes and paints, etc.). Scratch methods are especially important in tests of anisotropic materials where a change in scratch width is the measure of anisotropy. In static indentation methods, the indentations obtained in anisotropic materials are misformed, varying... 

Uses Urethane-acrylic, solv. resist, aid, abrasion resist, aid in coatings, screen inks, overprint varnishes, wood coatings, plastic film, laminating adhesives, floor tile, and metal coating finishes Features Resilient, nonyel. supplied as base resin or as resin/monomer blends which offer resilience, water-wh. clarity, and exc. heat and light stability to UV/EB-cured prods. 

---