Accelerators alkyds

The largest user of phenol in the form of thermosetting resins is the plastics industry. Phenol is also used as a solvent and in the manufacture of intermediates for pesticides, pharmaceuticals, and dyestuffs. Styrene is used in the manufacture of synthetic rubber and polystyrene resins. Phthalic anhydride is used in the manufacture of DMT, alkyd resins, and plasticizers such as phthalates. Maleic anhydride is used in the manufacture of polyesters and, to some extent, for alkyd resins. Minor uses include the manufacture of malathion and soil conditioners. Nitrobenzene is used in the manufacture of aniline, benzidine, and dyestuffs and as a solvent in polishes. Aniline is used in the manufacture of dyes, including azo dyes, and rubber chemicals such as vulcanization accelerators and antioxidants. 

Fig. 47 shows the surface of a corresponding P.R. 48 4 coating (Sec. 2.7.2.4) made of an alkyd-melamine system. The samples were examined after a 5000 hour exposure in an accelerated exposure unit (Xenotest 1200). 

Use Polymerization catalyst for resins, including olefins, styrene, styrenated alkyds, and silicones ignition accelerator for diesel fuel organic synthesis intermediate. 

Solvent-Containing, Air-Drying Epoxy Esters. In order to produce epoxy resin esters that can be cured at room temperature, solid epoxy resins (M, 1500-2000 e.g., Araldite GT 6084, Ciba-Geigy Epikote 1004, Shell) are reacted with air-drying fatty acids (e.g., linseed oil or soybean oil fatty acid). The area of application of these resins is very similar to that of air-drying alkyd resins, but they have a higher chemical resistance and improved flexibility. Normal driers (e.g., cobalt octoate) are used to accelerate drying. 

Only a limited amount of resin can be added to white paints due to its intrinsic color. Addition of these hard resins increases the hardness and the gloss of the paint films, accelerates and improves the drying of oxidatively cross-linking alkyd resins, and optimises sanding properties and corrosion protection in putties. Modified phenolic resins have lost much of their importance because they have been replaced by more efficient binder systems (e.g., thermoplastic and cross-linkable acrylic resins, polyurethane systems). Rosin-modified phenolic resins are, however, still extremely important in the production of resins for printing inks. 

This process is similar to the previously described unbaked alkyd oil process, the difference being in this case heat treatment of the parts in order to accelerate the curing. 

Uses Carrier in inks hard resin additive in overprint varnishes reactive polyol in melamine- and urethane-cured coatings for wood and metal intermediate for polyester and alkyd coatings cure accelerator, hardener, gloss aid, chem. resist, aid in coatings Properties Wh. pastilles sol. ( 25% solids) in Arcosolv soivs., butanol, NMP insol. in water, propylene glycol, and ethylene glycol m.w. 2500 (wt. avg.) bulk dens. 5.556 Ib/gal acid no. < 0.1 hyd. no. 255 VOC 0.10%... 

An alkyd resin containing less than 1% PANI was examined for its ability to protect carbon steel against aqueous corrosion. In field tests, in urban and marine environments, as well as in accelerated laboratory tests, the presence of PANI in the alkyd resin improved the corrosion protection of carbon steel and also the degradation resistance of the coating [214]. 

Uses. Melamine and urea formaldehyde resins are used as modifiers for alkyds and other resins to increase hardness and accelerate cure. 

Conversion. The cure of many oxidative thermosetting coatings is accelerated by heating. In other resin systems, such as thermosetting acrylics and alkyd melamines, the reactions do not occur below tern-... 

Since the oil would body oxidatively in the presence of oxygen, air is displaced from the reaction vessel by inert gas (e.g. nitrogen), which continues to blanket the liquid for the remainder of the process. It is usually the practice to include a solvent for the alkyd (typically xylol) as up to 8% of the charge. The solvent accelerates reaction by distilling over into a separator with the water produced. Being immiscible with water, the solvent separates on condensation and is... 

Converted to cobalt carboxyiates Accelerates drying of alkyd based paint, ink, and varnish... 

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