Polychloroprene powder

Another study that concerned the use of an activated rubber crumb was also performed by Adov and co-workers [43]. They introduced a finely ground activated polychloroprene powder into a virgin chloroprene compound and made a quantitative assessment of the Payne effect in the vulcanisate. They produced data that showed the dependence of the real and imaginary parts of the dynamic shear modulus, and the dependence of the mechanical loss tangent on the logarithm of the strain amplitude for vulcanisates containing different contents of activated powder. Their results indicated that the introduction of the activated chloroprene powder into the vulcanisate promoted an improvement in the interaction of the rubber with the filler present in the compound, which should lead to an increase in the level of service properties for the products and open up a route for the effective re-use of the rubber waste. 

Colloidal particles, foams used to collect and separate, 12 22 Colloidal powders, 23 55-56 Colloidal silica, 22 380, 382, 384 applications of, 22 394 modification of, 22 393-394 preparation of, 22 392-393 properties of, 22 391-392 purification of, 22 393 Colloidal silica gels, 23 60 Colloidal solids, 7 293-294 Colloidal stability, 7 286-291 10 116 22 55 Colloidal stabilizers, in polychloroprene latex compounding, 19 857 Colloid mills, 8 702 10 127 Colloids, 7 271-303 23 54. See also Polymer colloids analysis, 7 296 applications, 7 292-296 conducting, 7 524... 

Flamtard H. Flame retardant for PVC, polychloroprene, chlorosulfonated polyethylene, other halopolymers. White powder d = 3.4 dec 180° soluble in strong acids and bases LD50 (rat orl) > 5000 mg/kg, (rat der) > 2466 mg/kg. Alcan Chem. Atomergic Chemetais Biythe, Wiiliams Ltd. Joseph Storey. 

Commercial polychloroprene rubber is manufactured by aqueous free-radical emulsion polymerization followed by isolation of the solid polymer by one of several processes freeze roll isolation, drum drying (76), extruder isolation (77), precipitation and dr5dng or spray drying (78,79). Isolation of powdered polychloroprene has been reviewed (80). Of the methods cited, freeze roll and drum drying isolation are commercially important (Fig. 3). 

More important and with better properties are the cold-setting, two-component acrylate adhesives, which contain methacrylates or acrylates, sometimes mixed with styrene and methacrylic acid as monomer and, in addition, various polymers. The polymers used are primarily synthetic rubbers, such as polychloroprene, styrene-butadiene rubber, butyl rubber, polystyrene, polymethacrylates, and acrylate graft polymers of these polymers. Amines are used as accelerators, and benzoyl peroxide in the form of plasticizer pastes or a powder mixture with fillers is preferred as hardener [43]. 

A great deal of interest has been shown in the concept of powder mixing polychloroprene. Certain grades are commercially available in powder form, being produced from the standard chip by an attrition process and maintained in that form with the aid of 5% of precipitated silica as... 

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