Precautions monomer storage

Examples of hazardous reactions are given in Table 6.17. Table 6.18 gives basic precautions in monomer storage Table 6.19 lists properties of common monomers. 

Precautions (Cont d) mineral oils, 159, 166 mixtures of chemicals, 170, 171 monomer storage, 249 oxides of nitrogen, 154 oxidizing agents, 235 oxygen, 260, 302 painting, 164, 167... 

Formula H2C=C(CH3)C02CH2CH20C2H5 Properties Colorless clear liq. m.w. 158.20 b.p. 91-93 C ref. index 1.4290 Toxicology Harmful irritant TSCA listed Precaution Combustible Storage Refrigerate Uses Adhesives monomer Regulatory AlCS, NDSL, EINECS, ENCS, PICCS listed... 

Properties Liq. m.w. 184.25 b.p. 125 C (20 mm) ref. index 1.4370 Toxicology TSCA listed Precaution Combustible Storage Heat and light sensitive Uses Monomer for pressure-sensitive adhesives, coatings, caulks, sealants in pharmaceutical topicals Regulatory FDA approved for topicals Manuf./Distrib. Aldrich http //www.sigma-aidrich.com] Ashland http //www.ashchem.com] CPS Monomer-Polymer Dajac Labs Isooctyl alcohol... 

To an experienced operator trained in the handling of industrial chemicals, the dimers present Httle cause for concern in handling or storage. The finished polymer coating presents even less of a health problem contact with the reactive monomer is unlikely. In the ancillary operations, such as cleaning or adhesion promotion, the operator must observe suitable precautions. Before using the process chemicals, operators must read and understand the current Material Safety Data Sheets, which are available from the manufacturers. 

Because chloroprene is a flammable, polymerisable Hquid with significant toxicity, it must be handled with care even in the laboratory. In commercial quantities, precaution must be taken against temperature rise from dimerisation and polymerisation and possible accumulation of explosive vapor concentrations. Storage vessels for inhibited monomer require adequate cooling capacity and vessel pressure rehef faciUties, with care that the latter are free of polymer deposits. When transportation of monomer is required, it is loaded cold (< — 10° C) into sealed, insulated vessels with careful monitoring of loading and arrival temperature and duration of transit. 

Siace dimer acids, monomer acids, and trimer acids are unsaturated, they are susceptible to oxidative and thermal attack, and under certain conditions they are slightly corrosive to metals. Special precautions are necessary, therefore, to prevent product color development and equipment deterioration. Type 304 stainless steel is recommended for storage tanks for dimer acids. Eor heating coils and for agitators 316 stainless steel is preferred (heating coils with about 4s m (50 ft ) of heat transfer surface ia the form of a 5.1 cm schedule-10 U-bend scroU are recommended for a 37. 9-m (10,000-gal) tank. Dimer acid storage tanks should have an iaert gas blanket. 

List C contains peroxidisable monomers, where the presence of peroxide may initiate exothermic polymerisation of the bulk of material. Precautions and procedures for storage and use of monomers with or without the presence of inhibitors are discussed in detail. Examples cited are acrylic acid, acrylonitrile, butadiene, 2-chlorobutadiene, chlorotrifluoroethylene, methyl methacrylate, styrene, tetraflu-oroethylene, vinyl acetate, vinylacetylene, vinyl chloride, vinylidene chloride and vinylpyridine [1]. 

Storage of monomers and solvents also requires special precautions. The vessels must be specially constructed and be closed with a self-sealing cap through which the distilled contents can be transferred with a pipette or hypodermic syringe under inert gas. The contents should also not come in contact with tap grease. 

Precaution Fiamm. liq. avoid contact with acid Storage Store under nitrogen, away from heat Uses Reactive diluent for radiation-curable coatings comonomer in specialty coatings mfg. monomer for tackifying adhesives Manuf./Distrib. Aldrich BASF AG Salor Trade Names Rapi-Cure CVE... 

Formula (CH3)2CH0C(0)00C(0)0CH(CH3)2 Properties Colorless cryst. solid or liq. misc. with aliphatic, aromatic, and chlorinated hydrocarbons, esters, ethers pract. insol. in water m.w. 206.22 dens. 1.080 (15.5/4 C) m.p. 8-10 C rapid decomp. 63 F ref. index 1.4034 (20 C) Toxicology LD50 (oral, rat) 2140 mg/kg, (skin, rabbit) 2025 mg/kg mod. toxic by ing. and skin contact primary severe eye irritant TSCA listed Precaution Dangerous fire risk unstable above IOC impact- and heat-sensitive explosive spontaneous decomp. R.T. releases flamm. and corrosive prods. explodes on heating explodes on contact with amines or potassium iodide, possibly organics Hazardous Decomp. Prods. Heated to decomp., emits acrid smoke and fumes NFPA Health 0, Flammability 4, Reactivity 4 Storage Store in open containers low temps, with adequate ventilation Uses Low-temp, polymerization catalyst initiator for polymerization of unsat. monomers, PVC in food-pkg. adhesives polymerization catalyst in mfg. of paper/paperboard in contact with aq./fatty foods... 

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