Filler delaminated

Mica fillers are obtained by separation of mica from other minerals which might compose 10-20% of mineral content. Mica is diy or wet milled and classified. The mechanical grinding produces flakes with a low aspect ratio in a range from 20 to 40. The process may include ultrasonic delamination which leads to a high aspect ratio of over 200. Flakes of mica fillers have a thickness in a range from 1 to 3 im and a width in a range from 10 to 450 pm. 

The properties of filled materials are eritieally dependent on the interphase between the filler and the matrix polymer. The type of interphase depends on the character of the interaction which may be either a physical force or a chemical reaction. Both types of interaction contribute to the reinforcement of polymeric materials. Formation of chemical bonds in filled materials generates much of their physical properties. An interfacial bond improves interlaminar adhesion, delamination resistance, fatigue resistance, and corrosion resistance. These properties must be considered in the design of filled materials, composites, and in tailoring the properties of the final product. Other consequences of filler reactivity can be explained based on the properties of monodisperse inorganic materials having small particle sizes. The controlled shape, size and functional group distribution of these materials develop a controlled, ordered structure in the material. The filler surface acts as a template for interface formation which allows the reactivity of the filler surface to come into play. Here are examples ... 

These remarks evaluate the effect of filler-related phenomena on failure of plastic materials. Several reasons for the failure ofplastics are filler related. They include delamination of laminated composite materials, debonding in particulate filled materials, stress cracking of filler particles, yielding, cavitation, and corrosion. 

The adhesion between the matrix and the filler has an important influence on the mechanism of failure. In polyester filled with quartz, uncoupled (low adhesion) quartz was delaminated from the matrix if the quartz particles were in the path of the crack growth. Silane coupled quartz particles showed many instances of particle cracking on the pathway of crack growth. Apparently, adhesive forces were higher than the cohesion of filler material. ... 

The properties of novolac laminates can be improved by the addition of fillers. Corrosion protective materials suffered from delamination because of varia-... 

Although FEP is available as a liquid dispersion, the commonly used material in liquid dispersion coatings are PFA and PVDF. Both materials are used in various ways such as filled or unfilled. T q)ical fillers for PFA are mica flakes. PVDF can be reinforced with fiberglass cloth or carbon fabric for additional permeation protection. T q)ical thicknesses achieved are up to 80 milli-inches (2 mm). PFA coatings are used with wire mesh reinforcment for additional protection from delamination. 

Table IV presents some of our results with drops of 3 mm height on alumlnla ceramic. Numbers of cycles are listed when first delamination was detected by oilgratlon of Ink Into capillary delamlnatlon gaps. The second set of figures tells the numbers of cycles which led to total lift-off. It Is clearly seen that adding glycldoxypropyl-trimethoxy-silane improves adhesion although the filler Is already silane treated. There is an optimum In silane content higher concentrations seem to act as dehesive.

Chem. Descrip. Delaminated kaolin clay CAS 1332-58-7 EINECS/ELINCS 296-473-8 Uses Filler, pigment for paper coatings, esp. merchant grade papers, label and glossy cover stock Features Easy glossing... 

CAS 1332-58-7 EINECS/ELINCS 296-473-8 Uses Filler for adhesives, paints, plastics, and inks Features Delaminated functional filler high brightness, finer particle size Properties Spray-dried beads, slurry 0.6 pm particle diam. 0.01% max. on 325 mesh fineness (Hegman) 5-t- sp.gr. 2.60 bulking value 21.7 lb/ gal surf, area 13-17 mVg oil absorp. 40-45 brightness 90-91 pH 6.0-7.5 (100 gclay/250 ml water)... 

---