Medium oil polyester

Coating materials may be based on short or medium-oil alkyds (e.g. primers for door and window frames) nitrocellulose or thermoplastic acrylics (e.g. lacquers for paper or furniture finishes) amino resin-alkyd coatings, with or without nitrocellulose inclusions, but with a strong acid catalyst to promote low temperature cure (furniture finishes) two-pack polyurethanes (furniture, flat boards) unsaturated polyester resins in styrene with free-radical cure initiated by peroxides (furniture) or unsaturated acrylic oligomers and monomers cured by u.v. radiation or electron beams (coatings for record sleeves paperback covers, knock-down furniture or flush interior doors). 

Medium oil length mahua oil-based pentalkyds (polyesters) were prepared with varying degrees of excess hydroxyl, which was converted into liquid crystalhne form by copolymerising with p-hydroxybenzoic acid in the presence of dicyclohexyl carbodiimide (DCC) (Fig. 4.3). An improvement was observed in the resistance to scratching and the drying time of the hquid crystalhne resins. These have low viscosity and good film properties. 

A large variety of seed oils have been used in the preparation of polyester. Rubber seed oil and karinotta oil were used in the preparation of air dried and oil-modified polyester resins. The resins were also prepared by the reaction of orange seed oiVJatropha curcas seed oil with glycerol and phthalic anhydride. Melon seed and rubber seed oils have also been used in preparation of polyester resins. The study shows rubber seed oil may be substituted for linseed and soybean oils in the preparation of both long and medium oil length polyester resins. It has also been found that melon seed... 

Heat-transfer media Heat-transfer medium Heat-transfer oils Heat-transfer view Heat treating polyester Heat treatment Heavy crude oil Heavy-duty engines Heavy fuel oil Heavy gas oil Heavy metal Heavy metals... 

The semicrystalline polyesters of the terephthalate and naphthalate family are resistant to a wide range of chemicals at room temperature, including water, alcohols, ketones, ethers, glycols, chlorinated solvents, aliphatic hydrocarbons, and oils. They are slowly hydrolyzed in boiling water and rapidly degraded in strongly basic or acidic medium. 

Alkyd resin synthesis. This synthesis consists of two steps. In the first step, a triglyceride oil is reacted at ca. 250°C with polyols, such as glycerol or pentaery-thritol, in tire presence of a basic catalyst to form a monoglyceride. In the second step, phthalic anhydride, with or without another dibasic acid such as maleic anhydride, is added to the reaction medium and reacted at high temperature. The resulting product is a branched polyester (Scheme 2.56). 

Two-Package Polyol Urethane Coatings (ASTM Type 5). Two-package polyol urethane coatings consist of isocyanate-terminated adducts of polymers that are cured by reaction with di- or polyfunctional hydroxyl-containing materials. The latter may consist of low- to medium-weight polyols with a polyester, polyether, polyether urethane, or castor oil backbone. When the two components (OH- and NC0-) are mixed together, they have only a limited pot life. Therefore, the components are mixed prior to application. Catalysts may be used to speed up the cure either for room temperature or oven cure. 

As noted already, the detergency of the quaternary mixtures for lipophilic polyester fabric wjk 30 C is lower than for cotton fabrics. Besides, Fig. 14 shows that it is affected much more by the composition of the cleaning medium. After being cleaned with bicontinuous microemulsions or two-phase systems with an all l polyglycol ether content Cy = 20 wt% and n-undecane concentrations of 30 wt%test fabrics show a maximum in the reflectance difference of A/ =5 ll%. If the all l polyglycol ether content is decreased or the -undecane concentration is changed to - <20 wt% or c >60 wt%, the detergency decreases. The lowest values are found for oil-rich W/O microemulsions of samples 10, 15 and 20 (see Table 2). 

Infrared spectroscopy is used in the paint industry for quality control, product improvement and failure analysis, and for forensic identification purposes [8, 18-21], Paints are mainly comprised of polymeric binders and pigments in a dispersive medium. The binders are commonly alkyds (oil-modified polyesters), acrylics and vinyl polymers. Titanium oxide is the most commonly used pigment, while water or organic solvents are used as the medium. Paints may also contain other additives such as fillers (e.g. calcium carbonate) and stabilizers (e.g. lead oxide). 

The flexible fused silica columns have been commercially available for over three decades and allow substantial improvements in the separation of FAMEs, especially from oil samples rich in PUFAs, such as fish oil. Nevertheless, for some simple work, packed columns are still quite effective. The stationary phases for GC FAME analysis are almost exclusively polar polyesters. These are usually classified according to their degree of polarity, and usually only two main types are used those with medium polarity such as the carbowax type [polyethylene glycol (PEG) under various trade names] and those with high polarity, with cyanopropil polysiloxane stationary phases, such as HP-88, CP-SU88, BPX70, SP-2340, or SP-2560. ... 

Epichlorohydrin. Commercial polyester elastomers inclnde both the homopolymer and the copolymer of epichlorohydrin with ethylene oxide. The very polar chloromethyl gronp creates basic resistance to oil for these polymers, and they have been extensively used in fuel lines however, the desire for lower fuel permeation is cansing a search to be made for other polymers (20). Epichlorohydrin (ECO) has excellent resistance to fuel and oil swell. The ECOs show a volume swell of 35% at room temperature compared to 70% for a medium ACN-nitrile rubber in ASTM Reference Fuel C. The copolymer has a low temperature brittle point of -40°C and the homopolymer, -15°C. An interesting property of these elastomers is a stable dynamic performance over a wide temperature range however, the electrical properties are only average. 

Aluminum triphosphate has limited solubility in water and is frequently modified with either zinc or silicon to control both solubility and reactivity [23,29]. Researchers have demonstrated that aluminium triphosphate is compatible with various binders, including long-, medium-, and short-oil alkyds epoxies epoxy-polyesters and acrylic-melamine resins [73-76]. Chromy notes that it is particularly effective on rapidly corroding coatings it may therefore be useful in overcoating applications [39]. 

A medium ground pigment with the theoretically correct distribution of particles to ensure ziaximum loading to highly filled systems e.g., polyester resins, SMC, BMC, TMC, XtK . Particle Size Reunge (micrcnneters) Up to 44 Mean Particle Size (micrometers) 5.5 Oil Absorption (rub-out) 8-10... 

The analogous reaction between castor (or lesquerella) oil and sebacic acid also forms an aliphatic polyester. Unlike the epoxy-acid reaction, water is formed as a by-product, which must be removed from the reaction medium in order to obtain complete reaction and a void-free material. The reaction may be carried out with deliberate stoichiometric imbalance to form a high molecular weight hydroxy endcapped prepolymer, which may be thoroughly dried, and then crosslinked with a diisocyanate, which form urethane crosslinks without the release of water. Of course, hydroxy functionalized oils can also be reacted from the start with a diisocyanate, forming a complete polyurethane network,... 

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