Nanomer® I.22E

General Information:

Nanomer® I.22E nanoclay is a modified montmorillonite mineral which is formulated for anhydride- cured epoxy resins. When properly dispersed, I.22E creates a near-molecule blend commonly known as a nanocomposite. This new type of composite enhances strength and thermal properties,  especially glass transition temperature (Tg). Nanomer I.22E nanoclay is supplied as a white powder which disperses to particles so thin they are nearly transparent in the resin system. For more information about Nanomer structure and dispersion mechanism consult Tech Data G-100.

Loading Levels:

Unlike conventional mineral fillers, Nanomer nanoclays enhance performance at low loading, generally 10-25 phr. This unique feature allows for improved performance at minimal added weight.

Viscosity:

I.22E is preferred when mixing and/or curing must be done at lower viscosity. Table 1 gives typical viscosity data for low and high recommended loadings.

TABLE 1

Resin	Curing Agent	Nanoclay (phr)	RPM 10	RPM 30	RPM 50
		0	740 cps	740 cps	740 cps
EPON®828	ECA® 100	10	850 cps	830 cps	830 cps
		25	1250 cps	1200 cps	1150 cps

* Brookfield Model RV DV III, spindle # 3. All viscosities measured at 230C.

Suspension Stability:

Stability varies inversely with viscosity. I.22E forms a semi-stable system. Full stability will be maintained for 18-24 hours depending upon loading. Although the dispersion will “drop” over time, it will not hard-pack and can be reconstituted. If permanent stability is required I.28E should be used. However, I.28E will increase system viscosity and higher shear mixing equipment should be considered.

Strength Properties:

Epoxy nanocomposites exhibit improved mechanical properties due to reinforcing effects. Generally, the magnitude of improvement is larger in the region above the Tg. Figure 1 presents the DMA for neat epoxy and the corresponding nanocomposite at 25 phr loading.

Glass Transition:

I.22E creates a new, more interlinked structure in epoxy matrices. This is most apparent in the Tg. Increases of 10 - 200C are common. Although Tg increases with increased loading, most of the benefit is seen at the low end of the recommended range. A 10 phr loading usually produces 90% of the Tg improvement possible.