Dry-film preservatives

MODERN DRY-FILM PRESERVATIVES BASED ON POLYPHASE IPBC... 

Durotoc . [Morum Int L Mruton Int l. NV SA] Antimicrobial, mildew- uoofing agent for plastics, latex carpet backing, dry film preservative, filiation papers. 

Uses Dry film preservative for exterior masonry coatings, most stucco systems, adhesives, sealants, and caulks Features Color-stable stable to 100 C for algal and fungal protection Properties Off-wh. paste easily disp. 

Uses Dry film preservative for latex adhesives, wallpaper glues based on starch or cellulose, interior waterborne paints intended for damp and wet environs. 

Uses Dry film preservative, algicide, fungicide for acrylic stucco base coat mixes, mortars, and adhesives Features Rec. for prods, hydrated at site stable to 60 C solv.-free Properties Off-wh. powd. disp. 

Uses Dry film preservative for adhesives, sealants, and caulks fungicide, algicide for protection of dry film coatings and industrial fabrics Features Suited for applies, requiring extendi protection stable to 100 C solv.-free durable resist, to leaching Regulatory EPA registered... 

Uses Dry film preservative for high alkalinity typ. of min. stucco, silicate stucco, elastomeric roofing, unweathered cementitious surfe., roofing tiles, and exterior waterborne architectural paints needing high levels of algicidal protection... 

Features Dry-film preservative patented act. ingred. highly effective against fungi, and broad range of algae... 

Features Dry-film preservative esp. effective against fungi and algae which destroy surf, coatings Properties 32.5% min. act. 

Paulus, W. (ed.), 1992 Miller, G.A. and Lovegrove, T., 1980). However, dry-film preservatives are not generally necessary in most aqueous-based adhesives and polymer dispersions. 

Some important exampies of dry film preservatives include benzimidazoles such as carbendazim, octylisothiazolinone, carbamates and dithiocarbamates such as thiram, zinc pyrithione and chlorotha-lonil. Representative exampies are shown in Figure 5.23. As with in-can preservatives, the optimum use ievels should be determined by experiments. 

Hevi-Metal steel pellets have a density of about 10 gm/cm and are coated with a thin dry-film preservative that inhibits corrosion, while the high density tungsten pellets are non-corroding. Tungsten matrix pellets cannot rust and bind together under normal circumstances. Except for certain military shotshells, the company warns, no shotshells are completely waterproof. 

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. 

Both wet phase biocides and dry film preservatives should also be added to the sealants produced using polymer dispersions in order to achieve adequate protection against microbiological attack. The suitabiUty of these preservatives must be established and monitored experimentally. 

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