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Calcium carbonate reinforcement

The incorporation of calcium carbonate into polymers reduces impact strength [168,169], producing virtually no change in flexural modulus. The reported data for polypropylene are shown in Table 3.12. [Pg.81]


The production of modern car tyres uses more than 100 raw materials, most of which are based on petroleum products. Tyres consist of natural and synthetic mbber, typically styrene-butadiene (SBR) reinforcing fillers (e.g., carbon black, silica, clay, calcium carbonate) reinforcing fibres... [Pg.482]

Super-Pflex . [Pfizer] Surface-modified, precq>itated calcium carbonate reinforcing filler for PVC. [Pg.358]

A similar trend for a plateau limit in tensile behavior was also described by Jancar and Kucera (13) for calcium carbonate-reinforced composites of polypropylene using maleic anhydride to promote interfacial adhesion. Likewise, they observed convergence of interfacial shear strength value to that of the polypropylene yield strength. [Pg.430]

M. Tanniru, and R. D. K. Misra, On enhanced impact strength of calcium carbonate-reinforced high-density polyethylene composites. Mater. Sci. Eng. 405 (1-2), 178-193 (2005). [Pg.295]

The mbber compound usually requires an inert inorganic filler and small particle sise carbon particle for reinforcement. The mbber polymers vary in inherent tensile strength from very high in the case of natural mbber to almost nonexistent for some synthetic polymers, eg, SBR. The fillers most commonly used for mbber compounds include carbon black, clay, calcium carbonate, siUca, talc (qv), and several other inorganic fillers. [Pg.243]

Sihcone polymers when cured into elastomers by themselves ate weak, gel-like materials. For this reason, fillers must be used to provide reinforcement. The type of fillers (qv) used in sihcone sealants varies widely two of the most common fillers are fumed sihca and calcium carbonate. [Pg.310]

Calcium carbonate continues to be used in its original appHcation, putty, as weU as caulks, sealants (qv), adhesives (qv), and printing inks (qv). Large volumes are used in carpet backing and in joint cements. It is used to improve body, reinforcement, and other properties. [Pg.411]

The polysulfide base material contains 50—80% of the polyfunctional mercaptan, which is a clear, amber, sympy Hquid polymer with a viscosity at 25°C of 35, 000 Pa-s(= cP), an average mol wt of 4000, a pH range of 6—8, and a ntild, characteristic mercaptan odor. Fillers are added to extend, reinforce, harden, and color the base. They may iaclude siUca, calcium sulfate, ziac oxide, ziac sulfide [1314-98-3] alumina, titanium dioxide [13463-67-7] and calcium carbonate. The high shear strength of the Hquid polymer makes the compositions difficult to mix. The addition of limited amounts of diluents improves the mix without reduciag the set-mbber characteristics unduly, eg, dibutyl phthalate [84-74-2], tricresyl phosphate [1330-78-5], and tributyl citrate [77-94-1]. [Pg.492]

Carbon blacks are usually used as fillers. The semi-reinforcing types, such as PEP (Past Extmsion Pumace) and SRE (Semi-Reinforcing Pumace) give the best performance (see Carbon, carbonblack). To lower the cost and improve the processibiUty of light compounds, or to lower the cost of black compounds, calcined clay or fine-particle calcium carbonate are used. [Pg.504]

Particulate fillers are divided into two types, inert fillers and reinforcing fillers. The term inert filler is something of a misnomer as many properties may be affected by incorporation of such a filler. For example, in a plasticised PVC compound the addition of an inert filler will reduce die swell on extrusion, increase modulus and hardness, may provide a white base for colouring, improve electrical insulation properties and reduce tackiness. Inert fillers will also usually substantially reduce the cost of the compound. Amongst the fillers used are calcium carbonates, china clay, talc, and barium sulphate. For normal uses such fillers should be quite insoluble in any liquids with which the polymer compound is liable to come into contact. [Pg.126]

Reinforcing fillers (active) Fumed Silica (Si02) precipitated calcium carbonate (CaCOi) carbon black Thixotropic reinforcing agents (non-slump), adjustment of mechanical properties (cohesion) provide toughness to the elastomer as opposed to brittle materials. [Pg.701]

Non-reinforcing fillers (passive) Ground calcium carbonate (CaCO ) Reduce formulation cost adjust rheology, and mechanical properties. [Pg.701]

One of the most important phenomena in material science is the reinforcement of mbber by rigid entities, such as carbon black, clays, silicates, calcium carbonate, zinc oxide, MH, and metal oxide [45 7]. Thus, these fillers or reinforcement aids are added to mbber formulations to optimize properties that meet a given service application or sets of performance parameters [48-53]. Although the original purpose is to lower the cost of the molding compounds, prime importance is now attached to the selective active fillers and their quantity that produce specific improvements in mbber physical properties. [Pg.95]


See other pages where Calcium carbonate reinforcement is mentioned: [Pg.293]    [Pg.305]    [Pg.81]    [Pg.505]    [Pg.297]    [Pg.293]    [Pg.305]    [Pg.81]    [Pg.505]    [Pg.297]    [Pg.305]    [Pg.144]    [Pg.19]    [Pg.253]    [Pg.310]    [Pg.49]    [Pg.53]    [Pg.58]    [Pg.499]    [Pg.35]    [Pg.36]    [Pg.36]    [Pg.493]    [Pg.556]    [Pg.266]    [Pg.709]    [Pg.411]    [Pg.631]    [Pg.691]    [Pg.582]    [Pg.340]    [Pg.796]    [Pg.779]    [Pg.454]    [Pg.14]    [Pg.249]    [Pg.483]   
See also in sourсe #XX -- [ Pg.81 , Pg.82 ]




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