Several market known calcined aminosilanised kaolin types have been investigated. In each poduct the amount > 25 µm was analysed by wet screening.
Co_Nect PA KK 6, calcined kaolin, not silanised
Co_Nect PA KK 6_1_08, calcined kaolin, aminosilanised
- 1 P
- 2 N
- 3 T
Wet Screen Residue > 25 µm
After dissolving the dry calcined kaolin in water the suspension has been wet screened using a 25 µm screen. The residue > 25 µm was dried and analysed. All tests have been carried out using an analytical screen, Fa. Retsch, 25 µm.
About 250 to 500 g of kaolin has been used to be dissolved in about 1-2 l destilled water. Additionally SEM-Pictures of each sample > 25 µm have been made.
Wet Screen residue > 25 µm
|Co_Nect PA KK 6||8,8|
|Co-Nect PA KK 6_1_0
||57,6||Suspend in Butanol|
The amount > 25 µm in the investigated samples is quite different. The bene_fit products do have the lowest value. The wet screen residue in the silanised calcined kaolin Co_Nect PA KK 6_1_08 is only slightly higher than in the unsilanised base kaolin Co_Nect PA KK.
The amount > 25 µm in the reference material is five to over 10 times higher.
From the tests can be seen, that the measurement of the wet screen residue > 25µm is an easy way to determine the coarse grain particles in calcined silanised
The results also show, that the bene_fit product Co_Nect PA KK 6_1_08 has the lowest wet screen residue in comparison to all investigated references.