Latex mixing

Latex Mixes. The first step in latex fabrication is to bring compounding ingredients into solution or suitable dispersion form. Most ingredients are not water soluble and it is necessary to emulsify Hquids and microdisperse soHds in water (see Latex technology). 

In the Talalay process, the froth is produced by chemical rather than mechanical means. Hydrogen peroxide and an enzyme decomposition catalyst are mixed iato the latex and the mixture placed ia the mold. Decomposition of the peroxide by the added enzyme results ia the Hberation of oxygen which causes the latex mix to foam and fill the mold. The foam is then rapidly chilled and CO2 is iatroduced to gel the latex. The gelled foam is then handled ia a manner similar to that used ia the Dunlop process. 

PBAs are generally prepared by three commercial methods [57,124] latex mixing, solution mixing, and melt mixing. 

Latex mixing is the most important technique for the preparation of commercial PBAs. In this process two important factors are to be taken into consideration ... 

H. L. Stephens, R. W. Roberts, T. F. Reed, and R. J. Murphy, Starch-Elastomer Master-baches, Ind. Eng. Prod. Res. Develop. 10(1), 84 (1971). Semi-IPNs prepared from rubber latex and aqueous polymer solution. Zinc starch xanthate or starch xanthide solutions. SBR or NBR latexes. Mixing of starch and latex, and coagulation. Physical and mechanical properties, oil resistance. 

A rubber-coated fabric that is highly resistant to passage of liquid water but easily passes water vapor can be made by coating fabric with latex mixed with hydrophobic silica acro-gcl to provide the porosity (582). 

Methods of Blend Preparation. Most polymer pairs are immiscible, and therefore, their blends are not formed spontaneously. Moreover, the phase structure of polymer blends is not equilibrium and depends on the process of their preparation. Five different methods are used for the preparation of polymer blends (60,61) melt mixing, solution blending, latex mixing, partial block or graft copolymerization, and preparation of interpenetrating polymer networks. It should be mentioned that due to high viscosity of polymer melts, one of these methods is required for size reduction of the components (to the order of /ttm), even for miscible blends. 

Latex mixing Very much stronger and elastic as the elastomer chains have not been degraded by the mechanical work. Cost-effective conventional vulcanization since even postvulcanization takes place at a relatively low temperature. Relatively inexpensive equipment. Restricts product thickness. High consumption of energy for drying processes. 

No natural mbber is foimd in the soil of Hevea plantations so it is believed that NR is biodegradable. However, it can be preserved under suitable conditions. Native Mesoamericans made rubber balls from Castilla elastica (see Figure 4.24 in Experiments) latex mixed with the juice of morning glory that crosslinked the polymer chains. 

Features Protects latex mixes from the sensitizing effects of fillers and electrolytes... 

Effects of pH on the heterocoagulation of MN slime-latex mixed dispersion (8.0% w/v slime and 0.1% w/v latex) studied as a function of CaClj concentration. 

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