Resin based mastic

Base-plate wax compositions are generally regarded as trade secrets. A substantial percentage of paraffin is usually present, probably 50—80 wt %. Beeswax [8012-89-3] camauba wax [8015-86-9] ceresin, microcrystalline waxes, Acrawax C (Glyco Products Co. Inc.), mastic gum, rosin [8050-09-7] and synthetic resins may make up the balance of the formulation. Base-plate waxes are generally sold in sheet form about 1.3 mm thick, 75 mm wide, and 140 mm long. 

In addition to GC/MS, high performance liquid chromatography (HPLC/MS) has been used to analyse natural resins in ancient samples, particularly for paint varnishes containing mastic and dammar resins [34]. A partial limitation of chromatographic techniques is that they do not permit the analysis of the polymeric fraction or insoluble fraction that may be present in the native resins or formed in the course of ageing. Techniques based on the direct introduction of the sample in the mass spectrometer such as direct temperature resolved mass spectrometry (DTMS), direct exposure mass spectrometry (DE-MS) and direct inlet mass spectrometry (DI-MS), and on analytical pyrolysis (Py-GC/MS), have been employed as complementary techniques to obtain preliminary information on the... 

Uses Thickener, gellant for water-based trade sales and industrial coatings, acrylics, styrene-acrylics, and vinyl-acrylic latexes and water-reducible resins, gloss or flat paints, traffic paints, inks, adhesives, cement-based compds., mastics... 

Rosin family s most common form of adhesive is colophony, a hard amorphous substance derived from the oleoresin of the pine tree. This material is applied in solvent solution form as a hot-melt mastic. It has poor resistance to water, is subject to oxidation, and has poor aging properties. Plasticizers are usually added to reduce its brittleness. Bond strengths are moderate and develop rapidly. These materials are used as temporary adhesives in bonding paper and as label varnishes. They are also used as components of PSAs based on styrene-butadiene copolymers and in hot-melt adhesives and tackifiers. These materials have been largely replaced by synthetic-resin adhesives. One specialized form of rosin adhesive is Canada Balsam, covered by the obsolete Military Specification MIL-C-3469C, titled Canada Balsam. This material was intended for cementing optical elements. 

Bookbinders varnish n. Rapid drying varnish based on shellac, sandarac or gum mastic, or mixtures of these resins. Kirk-Othmer encyclopedia of chemical technology pigments-powders. John Wiley and Sons, New York, 1996. 

The assessment of the origin of terpenic resins by GC7MS is generally based on the qualitative recognition of specific molecular biomarkers that are normally specific for the genus [1,2,8,27,81-86]. Figures 36.8-36.10 illustrate the mass spectra of several biomarkers of mastic resin, frankincence resin, and birch bark tar, respectively. The GC/MS analysis of di- and triterpenoids requires the extraction and derivatization of... 

The choice of equipment for the production of solutions or mastics from butyl and PIB is primarily based on the viscosity of the product. Resins and other soluble or wettable ingredients are also often incorporated at this point. The following general guidelines may be useful ... 

Formulation. Unlike the natural rubber pressure sensitive adhesives, acrylic adhesives are often supplied in a ready-to-use form. Natural rubber adhesives require time-consuming and costly mastication of the rubber followed by dissolving in solvent. In addition, they must be formulated with a tackifier resin and antioxidants, neither of which is required with an acrylic adhesive. The acrylic adhesives are known for their good UV and oxidative stability while the rubber-based adhesives, because of their chemical unsaturation, are poor in these properties. In general, tackifiers are not required with acrylic adhesives as tack can be designed into the polymer by the proper choice of... 

SBR based adhesives are typically produced by first masticating the polymer on a two roll mill or Banbury mixer. Antioxidants, fillers, and other additives are then introduced. The processed mbber can be either calendared directly onto the adherend, dispersed and dissolved in a solvent with tackifying resins to form adhesive solutions, or dispersed in water with emulsifiers to form a latex. 

The key parameters to control are formulation water content, clay/latex ratio and resin/latex ratio, depending on the desired adhesive cost structure. Not surprisingly, too much filler or too little resin and/or oil will result in inferior properties. Excess water will result in slower drying, and probably the need for more water sensitive thickeners. Like many other SBR based adhesives, HSL based flooring mastics include in-can and dry-film preservatives as well as an antioxidant package to ensure long-term performance. 

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