Appearance : Milky white liquid
Active ingredient: 50%
Relative density: 1.020-1-1.100g/ml
PH value: 2.0-5.0
There have been some discussions and researches on the mechanism of titanate coupling agent. Most of them think that titanate coupling agent is different from any traditional coupling agent in the past. There is only one main feature in monoalkoxy titanate. The isopropoxy group is a hydrolysis group that can couple with inorganic substances, so it can form a monomolecular layer on the surface of inorganic pigments and fillers (see Figure 15-1); while silane coupling agents have 3 Hydrolyzed groups, so in addition to coupling with inorganic pigments and fillers, the silane coupling agent itself is also prone to condensation reactions between molecules, so that it is easy to form a multi-molecular layer on the surface of the pigments and fillers. In contrast, titanate The coupling agent can more closely connect the inorganic pigments, fillers and organic polymer materials, and give full play to the role of each titanate molecule, so the dosage is small and the effect is good.
According to experience, inorganic pigments and fillers with a relative density of 2.7 and a particle size of 2.5 pm only need to be coated with a titanate coupling agent of 0.4% of the filler mass, which can significantly reduce the viscosity of the system and increase the amount of inorganic fillers. Inorganic materials with small surface area and relatively coarse particle size, such as metal fibers and glass fibers, generally only need 0.1% of the mass of the inorganic materials to show obvious effects.
As the titanate coupling agent is coated on the surface of inorganic pigments and fillers in a single molecule state, it replaces the originally adsorbed trace moisture and gas, and at the same time passes ptfe powder price india through the long carbon chain hydrophobic non-hydrolyzable group of the titanate molecule (referring to coupling The general formula of the agent is i-CyH; OTi X: the X group in it), which increases the compatibility with the organic polymer base material, reduces the free energy of the interface, and facilitates the powder aggregates to be absorbed by the organic polymer base material. Wetting and dispersing.
In view of the above coupling mechanism of the titanate coupling agent, whether it is a powder, fibrous or flat solid surface, as long as there are chemically bonded or physically adsorbed hydroxyl groups or protons.
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