Silicone paint additives

Silicone Fluids. Sihcone fluids are used in a wide variety of appHcations, including damping fluids, dielectric fluids, poHshes, cosmetic and personal care additives, textile finishes, hydraiflic fluids, paint additives, and heat-transfer oils. Polydimethylsiloxane oils are manufactured by the equihbrium polymerisation of cycHc or linear dimethyl silicone precursors. Trifunctional organosilane end groups, typically trimethylsilyl (M), are used, and the ratio of end group to chain units (D), ie, M/D, controls the ultimate average molecular weight and viscosity (112). Low viscosity fluids,... 

Silicone c Xylene hydrocarbons, chlorinated hydrocarbons, ketones Electrical insulating resins, paint additive, brick sealant... 

A limited number of marine paint additives exist that can provide antifouling coatings that are nontoxic and fouling repellant. Silicon-free polyacrylates containing a pendant semifluorinated alkyl substituent have been prepared to address this need. 

Their low surface tension results in their utilization in the paint industry as flow, gloss and finish improvers. Silicone oil additives enable effect paints to be formulated such as moire effect paints. Their surface and interfacial activity enables their use as defoaming agents and as foam stabilizers for poly(urethane) foams. 

Union Carbide L, LE, R, Y. [Union Carbide] Silicone doivs. emollient, andfoam, wetting agent, lubricant, penetrant, ooemulsifier, sofieno release agent for cosmetks, rubber, plastic mold releases polishes textile finiriies paint additive. 

Viroasil . [GE Silicones] Silicone fluids emdlimit, defoamer, release agent, lubricant for cosmetics, pdishes, paint additives, mechanical devices, textile softeners, petre um refining, rubber and plastic mold release, film modifier in coatings, danqring in irmchanical/ elec, applies. 

Chem. Descrip. Methyl all laiyl silicone fluid Uses Release agent for mold metal, plastic, or rubber pads, foundry applies. internal lubricant for rubber, vinyl plastisols die lubricants paint additive... 

Chem. Descrip. Silicone-contg. additive (10%) in Isopar H Uses Finish additive, mar resist, aid, slip agent for solv.-based systems, paints, NC- and acid-curing wood lacquers, yacht varnishes, parquet lacquers, paper coatings, leather finishes Features Reduces orange peel, Benard s cell effect improves flow out gives smooth satin feel to surf. 

Polymeric leveling additives function through their tailor-made incompatibility in the paint film. During film formation, due to incompatibility, their molecules migrate to the interface. Unlike silicones, polymeric additives do not reduce the surface tension of the bulk of the paint film rather, they reduce the local surface-tension gradient and thus create a physically uniform and flat surface. An important advantage of polymeric leveling additives over silicones or fluorosurfactants is that they do not cause any intercoat adhesion problem. 

Perfluorinated urethanes enhance the protective properties of anticorrosive paints [50]. Fluorinated silicone surfactants also have been used as paint additives [51]. 

Some elements come in and out of fashion, so to speak. Sixty years ago, elemental silicon was a chemical curiosity. Today, ultrapure silicon has become the basis for the multibillion-dollar semiconductor industry. Lead, on the other hand, is an element moving in the other direction. A generation ago it was widely used to make paint pigments, plumbing connections, and gasoline additives. Today, because of the toxicity of lead compounds, all of these applications have been banned in the United States. 

David et al. [184] have shown that cool on-column injection and the use of deactivated thermally stable columns in CGC-FID and CGC-F1D-MS for quantitative determination of additives (antistatics, antifogging agents, UV and light stabilisers, antioxidants, etc.) in mixtures prevents thermal degradation of high-MW compounds. Perkins et al. [101] have reported development of an analysis method for 100 ppm polymer additives in a 500 p,L SEC fraction in DCM by means of at-column GC (total elution time 27 min repeatability 3-7 %). Requirements for the method were (i) on-line (ii) use of whole fraction (LVI) and (iii) determination of high-MW compounds (1200 Da) at low concentrations. Difficult matrix introduction (DMI) and selective extraction can be used for GC analysis of silicone oil contamination in paints and other complex analytical problems. 

Industrially, silicone surfactants are used in a variety of processes including foam, textile, concrete and thermoplastic production, and applications include use as foam stabilisers, defoamers, emulsifiers, dispersants, wetters, adhesives, lubricants and release agents [1]. The ability of silicone surfactants to also function in organic media creates a unique niche for their use, such as in polyurethane foam manufacture and as additives to paints and oil-based formulations, whilst the ability to lower surface tension in aqueous solutions provides useful superwetting properties. The low biological risk associated with these compounds has also led to their use in cosmetics and personal care products [2]. 

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