Latex compounding

Latex Compounding. Latex compounding must take into account the stability of the latex both before and after compounding. Where consideration of soHds concentration permits, the additives are best predispersed in a compatible aqueous surfactant before addition to the latex. The volume of additives, especially if clay fillers are involved, may easily be enough to starve the system for soaps and flocculate the compound. On the other hand, dry powders or molten resins may often be added directly to the nonionic latex. 

History. This includes the severity grading of the clinical reaction, the time of administration and onset of symptoms, the concomitant use of other drugs, foods or compounds (latex), previous history of drug allergy, atopy in the personal or family history, other underlying conditions such as mastocytosis or Cl esterase inhibitor deficiency. The actual preparation in its galenic identity should be stored or at least listed. 

A method of manufacturing rubber articles by pouring a compounded latex into an absorbent hollow mould the skin of rubber thus formed is removed, dried and vulcanised. The term is also apphed to the pouring into moulds of liquid polymer systems based on silicone or polyurethane elastomers. 

A method of manufacturing latex foam. Compounded latex is foamed and gelling agent added the mould is filled and the gelled foam vulcanised by steam at 100 °C the product is stripped from the mould, washed and dried. See Talalay Process. 

A process for making hollow articles from latex. A heat-sensitised compounded latex is poured into a hollow non-porous mould which is then rotated about several axes until the latex has gelled on the surface of the mould. See Rotational Moulding. Similar to slip casting of ceramics. Ketones... 

Rubber thread of circular section (see Cut Thread) made by extruding compounded latex through glass nozzles into a coagulating bath of acid. 

A method of manufacturing latex foam. Compounded latex is partially frothed and fully expanded by application of vacuum to the mould the gel is frozen, set by carbon dioxide and vulcanised by raising the temperature of the mould. See Dunlop Process. 

Although not widely used, it is possible to produce a heat sensitive compounded latex and then to use a heated former to cause deposition. The thickness of the deposit depends on the heat sensitivity of the latex and the temperature and heat capacity of the former. 

Cellular rubber is a generic term and includes latex foam produced chiefly by aeration of compounded latex, which is of necessity open-cell because water must be removed rapidly during processing (1). ASTM D 1055 defines flexible cellular rubber as "a cellular organic polymeric material that will not rupture within 60 seconds when a specimen 200 by 25 by 25 mm is bent around a 25-mm diameter mandrel at a uniform rate to produce 1 lap in 5 seconds in the form of a helix at a temperature between 18 and 29 C." The structure of latex foam rubbers consists of a network of open or interconnecting cells. Latex foam rubbers are made from rubber lattices or liquid rubbers. They are manufactured in sheet, strip, molded, or specific shapes (3). 

Rug bucking compounds, latex Separators, battery rubber Sheeting, rubber or rubberized fabric... 

The finished dry rubber and latex based rubber products can be vulcanized by several techniques depending on the type of rubber compound (dry rubber compound/latex compound), size of the finished product, and its shape and structure. Moulded rubber products are vulcanized by press curing using compression, transfer, or injection moulding presses. The vulcanization techniques other than moulding may be grouped into batch and continuous methods. The batch methods include the use of autoclaves, hot air/gas oven, and hot liquid/ water bath. Rubber products may be vulcanized at room temperature by cold curing either by immersion of rubber products in a carbon disulphide solution of sulphur chloride (SjCy, or by exposure to its vapour. 

Neoprene is also available in a variety of forms. In addition to a neoprene latex that is similar to natural rubber latex, neoprene is produced in a "fluid" form as either a compounded latex dispersion or a solvent solution. Once these materials have solidified or cured, they have the same physical and chemical properties as the solid or cellular forms. 

Butyl lactate Ethyl lactate dipping compounds, latex balloons Natural rubber latex... 

The approach used was to prepare a filler (e.g., polystyrene) of desired particle size by emulsion polymerization, to blend it in desired proportion with an SBR latex containing the necessary vulcanizing ingredients, to coagulate the blended, compounded latex and to vulcanize the rubber at temperatures well below the softening point of the polymeric filler. 

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