Cyclohexanone peroxide resin

Compound Name Cadmium Nitrate Cadmium Oxide Cadmium Sulfate Cyclohexanone Peroxide DI-(p-Chlorobenzoyl) Peroxide Tert-Butyl Hydroperoxide Aluminum Sulfate Calcium Phosphate Calcium Resinate... 

Ketone Peroxides. These materials are mixtures of compounds with hydroperoxy groups and are composed primarily of the two structures shown in Table 2. Ketone peroxides are marketed as solutions in inert solvents such as dimethyl phthalate. They are primarily employed in room-temperature-initiated curing of unsaturated polyester resin compositions (usually containing styrene monomer) using transition-metal promoters such as cobalt naphthenate. Ketone peroxides contain the hydroperoxy (—OOH) group and thus are susceptible to the same hazards as hydroperoxides. By far the most popular commercial ketone peroxide is methyl ethyl ketone peroxide [1338-23-4]. Smaller quantities of ketone peroxides such as methyl isobutyl ketone peroxide [28056-59-9], cyclohexanone peroxide [12262-58-7], and 2,4-pentanedione peroxide [37187-22-7] are used commercially (47). 

The two most important peroxy materials used for room temperature curing of polyester resins are methyl ethyl ketone peroxide (MEKP) and cyclohexanone peroxide. These are used in conjunction with a cobalt compound such as a naphthenate, octoate, or other organic-solvent-soluble soap. The peroxides are referred to as catalysts (though, strictly speaking, these are polymerization initiators) and the cobalt compound is referred to as an accelerator. 

Hardeners. The polymerisation reaction is initiated by peroxide radicals. Typical examples are cyclohexanone peroxide and methyl ethyl ketone peroxide (hydroperoxides), benzoyl peroxide, perbenzoates and peroctoates (acyl peroxides). It is standard to use around 4 % (calculated on the resin and styrene content) of a desensitised supply form (e.g. 50% peroxide in flexibiliser). The manufacturer s instructions are to be observed in handling peroxides. 

Adhesives based on methyl methacrylate and epoxy resins are used by engine-fitter mechanics (Castelain et al. 1992). In this way, they can come into contact with DGEBA, TGPAP, TGMDA, and epoxy novolac. Painters can work with products containing cyclohexanone peroxide, a catalyst for polyester finish. The standard allergens to consider are listed in Table 2 additional allergens in the aircraft industry are listed in Table 3. 

The most common accelerators for methyl ethyl ketone peroxide and cyclohexanone peroxide are salts of metals which exhibit more than one valency. The most widely used metal of this kind is cobalt, although salts of cerium, iron, manganese, tin and vanadium also find some application. In order to be effective as an accelerator a metal salt must be soluble in the polyester resin. The most commonly used salts are naphthenates, which are readily soluble octoates also may be used. (Naphthenic add is extracted from the gas oil and kerosene fractions of petroleum and consists of a complex mixture of carboxylic acids of substituted cyclopentanes and cyclohexanes. ) The decomposition of a hydroperoxide (ROOH) by a metal salt such as cobalt naphthenate to give free radicals proceeds according to the following chain reaction ... 

The di(hydroxyaLkyl) peroxide (2) from cyclohexanone is a soHd which is produced commercially. The di(hydroxyaLkyl) peroxide (2) from 2,4-pentanedione (11, n = 1 X = OH) is a water-soluble soHd which is also produced commercially (see Table 5). Both these peroxides are used for curing cobalt-promoted unsaturated polyester resins. Because these peroxides are susceptible to promoted decomposition with cobalt, they must exist in solution as equihbrium mixtures with hydroperoxide stmctures (122,149). 

Trade Name Synonyms Aztec CHP-50-P1 T[Aztec Peroxides] Aztec CHP-90-W1 T[Aztec Peroxides] Aztec CHP-HA-1 T[Aztec Peroxides] Cyclonox BT-50 T[Akzo Nobel http //www.akzonobel.com]] Luperox K4CE [At ofi n a http //www. atofinachemicals. com] Perhexa H j[NOF http //www.nof.co.jp] Cyclohexanone resin Synonyms Ketone resin Properties Colorless to pale yel. solid sol. in oxygenated solvs. insol. in aliphatic solvs. and water acid no. 0 hyd. no. 0 Uses Adhesion promoter in printing inks modifier for clear metal cellulose lacquers tackifier for polyamide hot-melt adhesives in food-pkg. adhesives floor paints Regulatory FDA 21CFR 175.105... 

The allergens in UP resin are often the auxiliary chemicals in the resin, such as cobalt naphthenate (Key et al. 1961 Bourne and Milner 1963 Malten and Ziehlhuis 1964 Kadlec et al. 1974), dibutyl phthalate, dimethyl phthalate, dioctyl phthalate (Malten and Ziehlhuis 1964), tricresyl phosphate (Key et al. 1961) or a cross-linking monomer, such as styrene (Key et al. 1961 Bourne and Milner 1963 Meneghini et al. 1963 Sjoborg et al. 1982 Conde-Salazar et al. 1989) or a hardening catalyst such as benzoyl peroxide (Bourne and Milner 1963 Malten and Ziehlhuis 1964 Vincenzi et al. 1991), cyclohexanone hydroperoxide (Malten 1964) or methyl ethyl ketone hydroperoxide (Bourne and Milner 1963 Malten and Ziehlhuis 1964). The... 

A synergic action of a mixture of epoxy resins with cadmium stearate has been demonstrated in the reaction of radical decomposition of hydroperoxide. This mixture exhibits activity in the inhibition reaction, exceeding not only that expected from a calculation on the basis of additivity, but also the activity of the most energetic inhibitor of peroxide decomposition - cadmium stearate (Fig. 101) [12]. Synergic action in the stabilization of polyvinyl chloride by mixtures of epoxy compounds with lead silicate, mixtures of the autocondensation products of cyclohexanone with lead silicate, as well as mixtures of the autocondensation products of cyclohexanone with organotin compounds and with calcium stearate, is described in [74, 77, 98]. 

Baling Petrochemical Co is an affiliate of Sinopec. The company s annual outputs of PP and epoxy resins are 131 600 tonnes and 25 000 tonnes, respectively. In addition, it produces piolystyrene, PBT, unsaturated polyester resin, nylon-6 and polyester chip. Other main products include hydrochloric acid, caustic soda, hydrogen, peroxide, sulphur, commercial liquefied chlorine, ammonia, ammonium sulphate, urea, aqueous ammonia, nitrogenous fertilizer, propylene, propylene oxide, butadiene, benzene, toluene, mixed xylene, styrene, bisphenol-A, cyclohexanone,... 

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