Mixing and Casting

Bimodal oxidizers are normally used to improve fluidity for mixing and casting. These... 

In the plastisol propellant process, it is essential that the resin particles not solvate too rapidly at processing temperature since a rapid increase in viscosity of the propellant mix interferes with the mixing and casting operation. There must be adequate pot life of the mixed propellant. The resin-plasticizer system itself is the dominating influence on pot life, and for this reason certain combinations cannot be used in the plastisol process. 

SC mixing, and casting techniques are suitable for self-help construction. 

As mentioned above, the binder/filler ratio determines the fluidity and hence the process technology for a given syntactic composition. The solid line in Fig. 1 shows how the apparent density depends on the relative microsphere concentration in syntactic compounds, provided there are no air inclusions. The lower limit of apparent density is at the concentration at which the filler is most densily packed at this point the material has its highest specific strength (strength per unit apparent density). Experience has shown that the closest packing of the spheres within the binder is obtained when the material is mixed and cast or molded under vacuum 8 10). 

Mean hydrogen sulfide concentrations measured during laboratory mixing and casting was below the maximum allowable concentration suggested by ACGIH. 

Figure 11.14. (a) Bend tost on notched cement bars, (b) Results for plastic mixed and cast... 

Particulate microcomposite Silica, carbon black, calcium carbonate, glass bead, glass balloons, silicon carbide Mechanical mixing and casting, compression moulding, matched-die moulding... 

Figure 19, Compatibility and optimum moisture content of soils used 2.i.5. Mixing and Casting...

The incompatibility of natural rubber/poly(methyl methacrylate) blends was also confirmed in solid form using scanning electron microscopy (Figure 13.4). For the solid natural rubber/poly(methyl methacrylate) blended films prepared by solution mixing and casting methods, the low level of the poly(methyl methacrylate) phase was found to be dispersed as domains in the continuous natural rubber matrix. The increasing amount of poly(methyl methacrylate)... 

Depending on the service, polymer concrete is cast in thicknesses from 1/2 in. (13 mm) to several inches, either with or without reinforcing. Cast-able polymer concretes are mixed and cast in a manner similar to that of Portland cement concrete, being poured into forms to harden. Troweled applications are generally thin coatings of less than 3/4 in. (20 mm) and are troweled in place with or without reinforcement. 

The preparation procedures of polysaccharide nanocrystal reinforced polymer nanocomposites using latexes consist of mixing and casting the two aqueous suspensions, followed by... 

The austerity of the war years promoted the use of reinforced concrete. Steel was precious, and the simple technology of mixing and casting earth materials allowed unskilled, replacement and slave labour to produce fortifications and production facilities. And the material was almost ideally suited to resisting... 

Using the hot melt approach, it is possible to mix and cast the adhesive film as a continuous operation. Here the individual raw materials are fed into a conventional screw extruder, are mixed under controlled temperature conditions and are then pumped out into a reverse-roll coating machine, which can produce film adhesives from as low as 50 g/m up to about 1800 g/mm. The schematic of such a process is shown in Fig. 55. 

For the first type, glass spheres having a size range of 5 - lOy were used (Microbeads Division, Cataphote Corporation, Jackson, Mississippi). These were added to an approximately 3% solution of the rubber in benzene, mixed, and cast into films of about 0.5 mm thickness on a teflon pan. After evaporating the benzene at room temperature, these were dried for about 16 hours in an oven at 45 C, then transferred to a press where they were cured by heating at 90 C for 20 minutes and then heated to 140 C for 40 minutes under 3000 psi pressure. 

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