Inhibited glues

A separate group of inhibited plastics includes such engineering materials as glues, sealants, plastic Cl carriers, multi-purpose lubricants and others (see Chap. 5). Inhibited glues are intended to form tight, nondetachable joints in machine parts operating in hostile media. Sealants are able to prevent permeation of the ambient media and create impermeable immovable joints of machine parts. 

The only satisfactory method for synthesizing hydrazine was devised by Raschig1 and involves the oxidation of ammonia by sodium hypochlorite in the presence of some such catalyst as glue or gelatin. The purpose of the catalyst is to raise the viscosity of the solution and to inhibit the effect, by adsorption, of traces of metallic ions which cause decomposition of the hydrazine formed.2 It is therefore advisable to use distilled water. Since free chlorine, if present in the hypochlorite solution, oxidizes ammonia to nitrogen, special care must be taken in the preparation of the oxidizing solution. The hypochlorite solution should be distinctly alkaline. %... 

Vincent P, Marty A (1993) Neighboring cerebellar Purkinje cells communicate via retrograde inhibition of common presynaptic interneurons. Neuron 11 885-93 Volterra A, Meldolesi J (2005) Astrocytes, from brain glue to communication elements the revolution continues. Nat Rev Neurosci 6(8) 626 10... 

As in the Raschig process, aqueous caustic reacts with chlorine to make sodium hypochlorite solution. The urea solution is prepared by dissolving urea in water with the addition of steam to provide the heat needed for the endothermic dissolution. The temperature is kept at about 5°C for 43 percent urea solution. Glue is added at a ratio of 0.5g/Uter of solution to inhibit side reactions. The urea and hypochlorite solutions are added to the hydrazine reactor at a ratio of 1 4, and the reaction temperature is allowed to rise to 100°C. The crude product contains approximately 35 g N2H4/liter and can be refined in the same steps as used for the Raschig process. 

Aminoglutethimide [ah me no glue TETH i mide] is useful in second line therapy for the treatment of metastatic breast cancer. It inhibits the adrenal synthesis of pregnenolone from cholesterol, and the extra-adrenal aromatase reaction responsible for the synthesis of estrogen from androstenedione. Aminoglutethimide is administered orally, and is metabolized by the hepatic cytochrome P-450 system to inactive products. Because of its ability to induce this system, its own metabolism is accelerated, and interactions that increase the metabolism of dexamethasone (see p. 275), theophylline (see p. 220) and digoxin (see p. 158) can occur. Aminoglutethimide causes transient CNS depression and a maculopapular rash. 

Murangoni 1872 extracts of glue, gelatin and bran to inhibit corrosion of iron in acid... 

Volatile solvent abuse or glue sniffing, is common among teenagers, especially males. The success of the modem chemical industry provides easy access to these substances as adhesives, dry cleaners, air fresheners, deodorants, aerosols and other products. Various techniques of administration are employed viscous products may be inhaled from a plastic bag, liquids from a handkerchief or plastic bottle. The immediate euphoriant and excitatory effects are replaced by confusion, hallucinations and delusions as the dose is increased. Chronic abusers, notably of toluene, develop peripheral neuropathy, cerebellar disease and dementia damage to the kidney, liver, heart and limgs also occurs with solvents. Over 50% of deaths from the practice follow cardiac arrhythmia, probably caused by sensitisation of the myocardium to catecholamines and by vagal inhibition... 

The reactants are mixed at a low temperature and rapidly heated to promote reaction of the chloramine with ammonia. Glue or gelatine is used to inhibit the secondary reaction ... 

The methods that are most economical and capable of preserving the original properties of the Cl are diffusive saturation of the polymer matrix by inhibiting liquids, their introduction into the polymer solutions (latexes) or application of polymer layers (varnish, glue, etc.) onto the film base carrying the Cl. 

Calendering is used for manufacture of laminated and combined inhibited films by pasting, i.e. by bonding film blanks using glues or pol3mier melts [34]. 

A modification of the laminated anticorrosion film coat used on trunk Pipelines is shown in Fig. 2.58 [4,165]. The film consists of two barrier PE-based layers, 1 and 2. The first of these has strip substrates 1 bonded by glue 4 to a cellular layer 3 containing a mixture of heat-resistant mineral oil and Cl (sodium benzoate) 5. The second layer 2 is a separating layer and is weakly adhered to layer 3. Prior to application of the coating, layer 2 is removed and the film material is pasted over the metal pipeline, with inhibited layer 3 facing the surface being protected. Laminated materials of this t q)e are usually based on very strong cross-linked or oriented films to make the insulation more reliable and reduce its penetrability to ambient matter [4]. 

A. Rust-inhibition of glued steel structural elements by filling the glue composition with particles of an electrically negative metal, e.g. zinc [2]. 

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