Softening-melting Property

EFFECT OF MIXED CHARGE OF ORE AND LUMP COAL ON THE SOFTENING-MELTING PROPERTY OF THE... 

Xueyuan Road, Haidian District, Beijing, 100083, P.R.China Keywords Blast furnace, Liunp coal. Softening-melting Property Abstract... 

Little research has been done on the effect of lump coal on the smelting process of blast furnace. The softening-melting property of the lump coal and iron ore mixture, the coke and iron ore mixture, iron ore are studied in this paper, and the results obtained ate compared and analyzed. 

The softening-melting property of four kinds of mixture burden and iron ore was tested using experimental setup developed by USTB as shown in figure 1. 

Uses Compatibilizer in blends and alloys, polymeric coupling agent in reinforced or recycled PE or PP, adhesives and sealants, extruded or powd. coatings, textile adhesives, hot melts Properties Melt index 40 dg/min (190 C) dens. 0.925 g/cc soften, pt. ( flcat) 90 C tens. str. 14.1 MPa tens, elong. 80% flex. mod. 403 MPa 0.85%. maleic anhydride... 

The two types of plastics are thermoplastics and thermosetting plastics. Thermoplastics can be softened melt and recyclable. Recyclable plastics include Polyethylene Terephthalate (PET), Low Density Polyethylene (LDPE), High Density Polyetltylene (HDPE), and Polypropylene (PP). Thermosets can melt and take the shape only once and not used for repeated work. Sometimes, they are termed as non-recyclable plastics, and include polycarbonate, bakelite, nylon, and so on. Table 3shows synthetic polymer properties and their uses in packaging. 

Modified triacylglycerols can occur in different polymorphic forms, and these influence the melting properties of the fat, the softening point, the solids content, etc. Analysis of such properties is commonly performed using differential scanning calorimetry (DSC). DSC has been used to determine the physical properties of sTAG formed from interesterification products of triolein and tristearin (Seriburi and Akoh, 1998) and from acidolysis reactions between stearic acid and coconut oil (Rao et al., 2001). 

Better thermomechanical properties. Compatibilizer with high softening/ melting point governs the properties of nanocomposites. 

Glass is the name given to any amorphous solid produced when a liquid solidifies. Glasses are non-crystalline and isotropic, i.e. their physical properties are independent of the direction in which they are measured. When a glass is heated, it does not melt at a fixed temperature but gradually softens until a liquid is obtained. 

Polymers that soften or melt and then solidify and regain their original properties on cooling are called thermoplastic. A thermoplastic polymer is usually a single strand of linear polymer with few if any cross-links. 

Refractoriness (Melting Temperature). Instantaneous grinding temperatures may exceed 3500°C at the interface between an abrasive and the workpiece being ground (14). Hence melting temperature is an important property. Additionady, for alumina, sdicon carbide, B C, and many other materials, hardness decreases rapidly with increasing temperature (7). Fortunately, ferrous metals also soften with increasing temperatures and do so even more rapidly than abrasives (15). 

Thermoformability is a property required by the many sheet materials used in the thermoforming industry. These properties are unique for the specific forming methods used, and are best determined by actual thermoforming tests on smaU-scale equipment. The softening or drape temperature of the material, residual stress in the sheet from its manufacture, and its melt strength and viscosity are important parameters relating to this use. 

Most hydrocarbon resins are composed of a mixture of monomers and are rather difficult to hiUy characterize on a molecular level. The characteristics of resins are typically defined by physical properties such as softening point, color, molecular weight, melt viscosity, and solubiHty parameter. These properties predict performance characteristics and are essential in designing resins for specific appHcations. Actual characterization techniques used to define the broad molecular properties of hydrocarbon resins are Fourier transform infrared spectroscopy (ftir), nuclear magnetic resonance spectroscopy (nmr), and differential scanning calorimetry (dsc). 

An important property recommending the use of LLDPE in many packaging appHcations is thek sealabHity. CompositionaHy uniform resins are especiaHy attractive for such use because thek melting and softening points are 15—20°C lower than those of commodity LLDPE resins (Fig. 1). 

Carbon electrodes are the normal choice for the link in the connection chain to deflver power to the arc tip. Graphite may be used in special apphcations, but the higher cost of graphite favors the use of carbon electrodes. Carbon possesses properties ideal to its appHcation as an electrode. These properties include no softening point, no melting point, electrical conductivity, strength increases with increasing temperature, resistivity drops as temperature increases, available in the size and purity desired, and cost effectiveness. 

Composition and Properties. Cocoa butter is a unique fat with specific melting characteristics. It is a soHd at room temperature (20°C), starts to soften around 30°C, and melts completely just below body temperature. Its distinct melting characteristic makes cocoa butter the preferred fat for chocolate products. 

---