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MOULDING COMPOUND

To obtain a strong busbar mounting system, suitable to withstand the electrodynamic forces arising out of a system fault, modern practice is to make use of thermosetting plastics, such as DMC (Dough Moulding Compounds)... [Pg.368]

This is also known as Bulk Moulding Compound (BMC). It is blended through a mix of unsaturated polyester resin, crosslinking monomer, catalyst, mineral fillers and short-length fibrous reinforcement materials such as chopped glass fibre, usually in lengths of 6-25 mm. They are all mixed in different proportions to obtain the required electromechanical properties. The mix is processed and cured for a specific time, under a prescribed pressure and temperature, to obtain the DMC. [Pg.369]

Following the success in blending rubbery materials into polystyrene, styrene-acrylonitrile and PVC materials to produce tough thermoplastics the concept has been used to produce high-impact PMMA-type moulding compounds. These are two-phase materials in which the glassy phase consists of poly(methyl methacrylate) and the rubbery phase an acrylate polymer, usually poly(butyl acrylate Commercial materials of the type include Diakon MX (ICI), Oroglas... [Pg.413]

Type Plexiglass-moulding compound 8N, manufaclure, Rohm GmbH... [Pg.414]

The chemical resistance of the mouldings depends on the type of filler and resin used. Simple phenol-formaldehyde materials are readily attacked by aqueous sodium hydroxide solution but eresol- and xylenol-based resins are more resistant. Provided the filler used is also resistant, phenolic mouldings are resistant to acids except 50% sulphurie aeid, formic acid and oxidising acids. The resins are stable up to 200°C. Some reeently developed grades of moulding compounds are claimed to be capable of exposure to 300°C for short periods. [Pg.652]

The dough moulding compounds were originally developed in an attempt to combine the mechanical properties of polyester-glass laminates with the speed of cure of conventional moulding powder. In spite of their somewhat high cost they have now established themselves in a number of applications where a mechanieally strong electrical insulant is required. [Pg.709]

Dough or bulk moulding compounds can suffer from a number of disadvantages of which the most important are ... [Pg.710]

Figure 25.12. Outline of machine for preparing sheet moulding compounds (SMC)... Figure 25.12. Outline of machine for preparing sheet moulding compounds (SMC)...
Table 29.4 Some typical properties of a silicone moulding compound... Table 29.4 Some typical properties of a silicone moulding compound...
Shellac [124,125] is a natural resin used in very old times for varnishes and moulding compounds. The resin secreted by the lac insect, Kerriar paca, is collected by scraping the shellac-encrusted trees found in southern parts of Asia. It consists of a complex mixture of cross-linked polyesters derived from hydroxy acids, principally aleuritic acid (9,10,16-trihydroxyhexadecanoic acid). From a structural point of view, it appears that this material can be used as a crosslinking agent and/or as a monomer for developing dentrite-like polymers. The question is whether it is possible to produce this material from shellac by controlled hydrolysis. [Pg.418]

This paper summarises an initial feasibility on reeyling scrap automotive plasties and eomposites using a eatalytie conversion process. The eharaeterisationofhydroearbon products is presented for sheet moulding compound (SMC), auto shredder residue (ASR) and reinforeed polypropylene (R-PP) materials and mixtures of body panels. Gas chromatography and scanning electron microscopy is used for the material characterisation. 26 refs. [Pg.44]

Increase viscosity, e.g. magnesium oxide in unsaturated polyester resins increases the viscosity so much that a liquid resin becomes a tackfree solid, suitable for making sheet moulding compound (SMC). A relatively high viscosity is also desirable for latex compounds used to coat textiles. [Pg.785]

PET however, has numerous shortcomings from the perspective of an injection moulding compound. Unmodified PET is generally not useful as an injection moulding resin because of its slow crystallization rate and the tendency to embrittle upon crystallization. For these reasons, PET has not traditionally... [Pg.495]


See other pages where MOULDING COMPOUND is mentioned: [Pg.419]    [Pg.369]    [Pg.369]    [Pg.369]    [Pg.369]    [Pg.321]    [Pg.524]    [Pg.709]    [Pg.709]    [Pg.709]    [Pg.710]    [Pg.710]    [Pg.711]    [Pg.782]    [Pg.783]    [Pg.924]    [Pg.945]    [Pg.946]    [Pg.8]    [Pg.9]    [Pg.324]    [Pg.334]    [Pg.334]    [Pg.419]    [Pg.44]    [Pg.45]    [Pg.763]    [Pg.778]    [Pg.784]    [Pg.23]    [Pg.23]    [Pg.518]    [Pg.4]    [Pg.792]   
See also in sourсe #XX -- [ Pg.369 ]

See also in sourсe #XX -- [ Pg.37 , Pg.209 ]

See also in sourсe #XX -- [ Pg.338 ]

See also in sourсe #XX -- [ Pg.21 , Pg.22 , Pg.23 , Pg.24 , Pg.25 , Pg.26 , Pg.27 , Pg.28 , Pg.29 , Pg.30 , Pg.31 , Pg.32 ]




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