Nitrocellulose properties

Features Improves adhesion esp. for difficult substrates compat. with most plasticizers, acrylics, nitrocellulose Properties Off-wh. solid sol. in alcohols, esters, ketones, aromatic soivs. insol. in aliphatic hydrocarbons soften, pt. (B R) 68-76 C 100% solids... 

Edenol LFW 101 [Cognis KGaA/CoatIngs Cognis KGaA/PlastIcs Tech.) Uses Secondary plasticizer, sandablllty enhancer, solv. release aid for sanding sealers, nitrocellulose Properties Liq. 

Ethyl propionate (propionic acid ethyl ester) n. Colorless liquid, fruity odor. Medium boiling solvent for nitrocellulose. Properties bp, 98°C Sp gr, 0.912/0°C flip, 12°C (43.6°F) vp, 43mmHg/30°C. 

Uses Dispersant, solubilizer, emulsifier, detergent for industrial alkaline built cleaners, textile dyeing and printing, metal cleaners stabilizer for latex and pigment dispersions, emulsions of resins, polyesters, waxes, nitrocellulose Properties Solid HLB 16.0 99% cone. 

Trimethylolethane trinitrate (metriol trinitrate) is not satisfactory as a plasticizer for nitrocellulose, and must be used with other plasticizers such as metriol triacetate. Mixtures with nitroglycerin tend to improve the mechanical properties of double-base cast propellants at high and low temperatures. Metriol trinitrate has also been used in combination with triethylene glycol dinitrate as a plasticizer for nitrocellulose. Its physical properties are Hsted in Table 7 (118-122). 

R. Van Dolah and S. Newman, Nitrocellulose Pi Keview of Some of Its Fundamental Properties, NOTS and Alleghany BaUistics Laboratory, Cumberland, Md., 1953. 

Rocket Propellants. SoHd rocket propellants are mostly based on chemically cross-linked polymeric elastomers to provide the mechanical properties required in launchings and the environmental conditions experienced in storage, shipment, and handling (see Elastomers, synthetic). Double-and triple-based nitrocellulose propellants are also employed as rocket propellants. 

Table 10. Composition and Properties of Nitrocellulose-Based Cast Propellants...

Uses. Diacetone alcohol is a widely used solvent in the coatings industry where it finds appHcation in hot lacquers which require high boiling components, and in bmshing lacquers where its mild odor, blush resistance, and flow-out properties are desired. Diacetone alcohol is also a solvent for nitrocellulose, cellulose acetate, and epoxy resins. 

Conventional nitrocellulose lacquer finishing leads to the emission of large quantities of solvents into the atmosphere. An ingeneous approach to reducing VOC emissions is the use of supercritical carbon dioxide as a component of the solvent mixture (172). The critical temperature and pressure of CO2 are 31.3°C and 7.4 MPa (72.9 atm), respectively. Below that temperature and above that pressure, CO2 is a supercritical fluid. It has been found that under these conditions, the solvency properties of CO2 ate similar to aromatic hydrocarbons (see Supercritical fluids). The coating is shipped in a concentrated form, then metered with supercritical CO2 into a proportioning airless spray gun system in such a ratio as to reduce the viscosity to the level needed for proper atomization. VOC emission reductions of 50% or more are projected. 

Poly(vinyl acetal) itself is now of little commercial importance. The material may be injection moulded but has no particular properties which merit its use. It is occasionally used in conjunction with nitrocellulose in lacquers, as a vehicle for wash primers and as a stiffener for fabrics. 

Blown oils differ from stand oils in that they are partially oxidised in addition to being polymerised. The oxidation is achieved by blowing air through the heated oil. This treatment results in a product having poor drying properties, and blown oils are therefore effective plasticisers and are used as such in nitrocellulose finishes. 

Nitrocellulose alone will not give a continuous coating. It must, therefore, be blended with other components comprising a plasticiser and a hardening resin. An extensive range of such products is available, the ultimate choice depending on the properties required. 

Most of over six million dentures produced annually in the USA are made of acrylics (PMMAs) that includes full dentures, partial dentures, teeth, denture reliners, fillings and miscellaneous uses. Plastics have been edging into the dental market for over a half century. Even before the introduction of acrylics to the dental profession in 1937, nitrocellulose, phenol-formaldehyde and vinyl plastics were used as denture base materials. Results, however, were not wholly satisfactory because these plastics did not have the proper requisites of dental plastics. Since then, PMMAs have kept their lead as the most useful dental plastics, although many new plastics have appeared and are still being tested. Predominance of PMMAs is not surprising, for they are reasonably strong, have exceptional optical properties, low water absorption and solubility, and excellent dimensional stability. Most denture base materials, therefore, contain PMMA as the main ingredient. 

The nitration of oxycelluloses yield products which resemble Nitrocelluloses in properties (see below)... 

According to Sutton, cast double base charges are likely to contain 45-55% nitrocellulose, 25—40% nitroglycerine, 12-22% plasticiser and 1-2% other ingredients such as stabilisers. Typical properties are ... 

Okra, Hibiscus escuentus L. The immature pods of okra are popular as a vegetable and okra is also used for the ability to thicken soups and stews, and for fiber and oil. Notmuch is known about okra most workers concentrate their research on the chemical composition (26-29) of the mucilaginous materials found in the pod (30) stalk, nutritional properties (31). Research has also been conducted on the developmental properties of the okra seed (32). This paper is the first report of the chemical composition of auxin conjugates in okra pods bound to nitrocellulose membrane. 

In 1846, Schonbein nitrated cellulose to nitrocellulose. Parkes came to know about nitrocellulose and found out that it had plastic properties but it contracted on drying. He found out that nitrocellulose dissolves in molten camphor and this mixture could be moulded into any form. 

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