Waste rubbers preparation

The efficacy of polyurethane and styrene butadiene rubber (SBR) as binders for ground rubber prepared from waste tires was compared to a formulation of a compound developed without binder. Without binder, the effect of both sulfur and accelerator content on tensile properties are studied, as well as the effect of ageing on these properties [29]. The suggested uses of the unbound product include rubber blocks, and ballast mats for railway applications. 

Gupta, V.K., Gupta, B., Rastogi, A., Agarwal, S., and Nayak, A. (2011) A comparative investigation on adsorption performances of mesoporous activated carbon prepared from waste rubber tire and activated carbon for a hazardous azo dye—Acid Blue 113. /. Hazard. Mater., 186(1), 891-901. 

Preparation of Waste Rubber Products prior to Grinding or Crumbing... 

Workers at the Chinese university of Yangzhou [35] have used microwaves to modify the surface of waste rubber crumb by devulcanising it and then blending it with NR in various proportions. These mixtures were then vulcanised and the mechanical properties, compression set, swelling behaviour and crosslink density investigated. The results obtained were compared with those of blends that had been prepared using crumb that had not been treated with microwaves. 

Vegetable waste L S P A Breweries Natural rubber Starch Sugar refineries Vegetable and fruit processing and preparation... 

Caution Thallium salts are very toxic. This preparation should be carried out in a well-ventilated hood. The operator should ivear rubber gloves. For disposal of thallium wastes, see Note 1 on p. 74. 

Matsushita et al. [127] prepared compositions showing good vulcanizability containing EPDM reclaim. Weather-strip wastes comprising of sulfur-cured EPDM mbber (containing 50% carbon black) were kneaded at 300°C and 3 MPa and extruded to give a rubber (Mw 200,000 gel content 65%), 25 parts of which was mixed with unvulcanized SBR 75, carbon black 37.5, and sulfur 1.3... 

A rubber glove and a box of cotton waste fell into a tank of spent nitrating acid from the preparation of TNT. The total contents of the tank ignited, leading to a series of explosions which caused severe damage and some 900 casualties, including 82 killed. 

Caution o-Xylylene dibromide is a powerful and persistent lachrymator. The preparation and all subsequent handling of this substance should, therefore, be carried out in an efficient hood with adequate protection by rubber gloves. A gas mask should be at hand for emergency. All apparatus coming in contact with the dibromide should be immersed in alcoholic alkali contained in a large crock with a lid. A period of 24 hours is sufficient for decontamination. Waste substances stick as filter paper and corks usually require several days of such soaking before they can be safely discarded. 

Wear nitrile rubber gloves, laboratory coat, and eye protection. Work in the fume hood. Prepare a 10% aqueous solution of the waste potassium chlorate. For each 10 mL of solution, slowly and while stirring, add 18 mL of a 10% solution of sodium bisulfite. Neutralize with sodium carbonate and pour into the drain with at least 50 times its volume of water.20... 

Wear eye protection, laboratory coat, and nitrile rubber gloves. Prepare a 10% aqueous solution of the waste sodium chlorate. For each 10 mL of solution, slowly, and while stirring, add 44 mL of a 10% solution of sodium bisulfite (this allows about 50% excess of reducing agent). The continued presence of chlorate can be detected by adding, to 3 mL of the solution, a freshly prepared solution of potassium iodide (100 mg) in 3 mL of 3 M sulfuric acid (prepared by cautiously adding 0.5 mL of concentrated acid to 2.5 mL of cold water). An amber to brown color indicates the presence of chlorate. Add sodium bisulfite solution until the test is negative. Neutralize the acidic solution with sodium carbonate and discard into the drain with at least 50 times its volume of water.11 12... 

Wear eye protection, laboratory coat, and nitrile rubber gloves. Prepare a saturated solution of waste sodium periodate in water. About 9.5 g of the salt will dissolve in 100... 

Small Quantities. Work in the fume hood. Wear nitrile rubber gloves, eye protection, and laboratory coat. Dissolve waste in a minimum volume of 6 M hydrochloric acid (prepared by cautiously adding concentrated acid to an equal volume of cold water) and filter. Neutralize with 6 M ammonium hydroxide (prepared by cautiously adding 36 mL of concentrated base to 69 mL of cold water use pHydrion paper) and precipitate with excess sodium carbonate. Filter, wash, and dry the precipitate. Recycle or send for disposal.3... 

The prepared cotton waste on arrival at the factory contains a notable percentage of hygroscopic moisture, also wood, pieces of iron, metal, string, rubber, etc . The mechanical impurities are removed as far as possible by hand-picking, and the cotton is then passed through a teasing machine (Fig. 30), which separates the cotton fibres and opens out knots and lumps. It is then again picked over as it leaves the machine. 

---