Product Model: UCB315
SiO2 content( m/g) :99
Porosity( m/g ):1.8
Average particle size (um):12
Oil absorption value (g/100g) :310
ph value :6.8
Heating weight loss :< 5
Surface treatment :organic
Dr.A.Capelle et al. pointed out that the wetting efficiency BS is:
BS=ysc~YsL(2-3) If the formula (2-3) is substituted for the human formula (2-1), then:
BS=YL GCOs 0(2-4) Because YLc and 0 angle can be measured, the wetting efficiency can be calculated,
Some difficulties will be encountered when relying on Young’s equation to measure the wetting effect, which should be paid attention to:
a. The interfacial tension of solid and solid/liquid interface cannot be measured by experimental methods, only related measurements can be made, so you must be careful when interpreting these measured values. carnauba wax as a food additive
b. Due to the adsorption of water, liquid or gas on the surface of the solid material, there is a single-molecule wetting layer. Therefore, the Young’s equation must be corrected during application.
c. Due to the different flatness of the surface of the object, according to the roughness of the solid surface, there must be a correction number when calculating the contact angle. The smaller the contact angle, the higher the flatness of the surface is required.
d. Monomolecular film layer.
e. Hysteresis (the difference between the forward angle and the backward angle),
f. The contact angle changes with temperature.
2. The relationship between wetting and agglomerate porosity and base material viscosity
In addition to interfacial tension, contact angle and wetting efficiency, the size and length of the porosity in the pigment agglomerates and the viscosity of the base resin liquid are also related to the wetting efficiency. Wash borre uses a formula to express the influence of various factors on the wetting efficiency in the initial stage of dispersion wetting [33
Y Fico sf(2-5)rl where K——constant;
Yr i—surface tension of the base material;
0-contact angle (base material/pigment surface);
A radius of the gap in the pigment particles;
l-—the length of the gap in the pigment particles;
—The viscosity of the base material.
Yr cos/ is the wetting efficiency in formula (2-4). Wash-brre more comprehensively combines pigment state, porosity, resin viscosity and wetting efficiency.
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