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Method of use of titanate (pretreatment method)
The filler or pigment is pretreated with a coupling agent, and then processed and mixed with polymers and other additives. This method has many advantages, especially suitable for some engineering plastics with complex polymer components or high processing temperature, which can prevent unnecessary side reactions, and the decomposition point of coupling agent and filler after pretreatment is greatly improved.
This law can be divided:
① Dry mixing method: in order to make a small amount of titanate evenly coated on the surface of the pigment and filler, a small amount of diluent is generally added, and the dosage ratio of coupling agent is 1: 1, so that a small amount of titanate can be evenly distributed on the surface of the filler, and the filler cannot be evenly coated without diluent. This diluent can use the solvent and lubricant in the original process formula. For example, white oil (liquid paraffin) can be selected in the plastic industry, engine oil can be selected in the rubber industry, and 200# solvent oil or isopropanol can be selected in the coating industry. Generally, a high-speed kneader is used for the treatment equipment, I .e. the filler is sprayed into the diluted coupling agent in mist form under high-speed stirring, then stirred for 5-15 minutes (depending on the effect of the stirrer), and then carried out according to the original process or discharging for standby (pay attention to cooling, otherwise, it is easy to cause local overheating to discolor the filler and reduce the filling performance).
② wet mixing method: single alkoxy type, coordination type and other coupling agent can be used solvent oil, petroleum ether, benzene alcohol and other solvents to dilute the pigment soaked in them, and then use heating or decompression methods to remove the solvent, for the water soluble chelating type is diluted with water soak, and then to water. The coupling of this method is relatively complete, but it is too expensive in industrial production and economically uneconomical.
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