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Composition Analysis of Titanate Coupling Agent and Its Mechanism and Application Method
Release Date:
2021-11-22
One. component analysis of titanate coupling agent:
Titanate coupling agent is a kind of novel chemical additive which has developed rapidly in the past ten years and is widely used in many production fields. Common titanate coupling agents include monoalkoxy fatty acid type, phosphate ester type, chelate type and ligand type. The application of titanate coupling agent opens up a new way for inorganic filling of polymer synthetic materials. Inorganic substances treated with titanate coupling agent are hydrophilic and organic, it is widely used in polyolefin resins and synthetic rubber and other polymer materials; the titanate coupling agent added to the polymer can improve the impact strength of the material, the amount of filler can reach more than 50%, and will not occur phase separation. Carbon black activated with titanate coupling agent, SiO2, CaCO3, metal oxide added to thermoplastics and rubber, can reduce the system viscosity, improve toughness and mechanical properties. Kan
II. Titanate coupling agent coupling mechanism.
Titanate coupling agent is composed of hydrophilic and hydrophobic groups. It is coupled with the surface of inorganic pigments and fillers through chemical reaction and cross-linked with polymer base materials. It combines two substances with different properties and acts as a bridge. Therefore, titanate is also called a "bridging agent". It is pro-organic at one end and pro-organic at the other end, it builds a bridge between inorganic fillers and organic resins. After the inorganic filler is treated with the coupling agent, the surface of the inorganic filler is coated with the chemical bond of the coupling agent and the inorganic affinity to the organic polymer material, which tightly connects the inorganic pigment, the filler and the organic polymer material, and fully exerts the function of each titanate molecule, which increases the compatibility with the organic polymer base material, reduces the free energy of the interface, and thus facilitates the wetting and dispersion of the aggregate powder by the organic polymer base material.
Three. Titanate coupling agent method of use.
1) Mixing method: it is to directly mix polymers, fillers or pigments and other additives with coupling agents. This method is relatively simple and does not need to increase equipment and change the original processing technology. The disadvantage is that the dispersion is not ideal, because other additives and coupling agents will have competitive reactions. Great. Great.
2) pretreatment method: the first filler or pigment with a coupling agent for pretreatment, and then processed and mixed with polymer 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. Oh, great, great.
A. dry mixing method: in order to make a small amount of titanate coupling agent evenly cover the surface of pigment and filler, a small amount of diluent is generally added. when the dosage ratio of titanate to coupling agent is 1:1, a small amount of titanate can be evenly distributed on the surface of filler, and filler cannot be evenly covered 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, oil or isopropyl alcohol can be selected in the coating industry, and solvent treatment equipment with reduced performance can be used. Generally, a high-speed kneading machine is selected, I .e. the filler is stirred at high speed for standby, but cooling must be paid attention to, otherwise it is easy to cause the filler to change color and fill.
B. wet mixing method: monoalkoxy type, coordination type and other coupling agents can be diluted with solvent oil, petroleum ether, benzene alcohol and other solvents to soak the pigment, then under stirring, spray the diluted coupling agent in mist form, continuously stir for 5-15min (depending on the effect of the stirrer), then remove the solvent according to the original process or by heating or decompression, and dilute and soak with water for chelating type soluble in water, then go moisture. The coupling of this method is relatively complete, but it is too expensive in industrial production and economically uneconomical. My word, my word.
If calcium carbonate is filled with polypropylene and titanate coupling agent is added, the coupling agent is diluted 1:2 with isopropanol first, the dried calcium carbonate is put into a high-speed kneader and the diluted coupling agent is put into a high-speed kneader according to the proportion, the mixture is evenly mixed and discharged, then the mixture is sent to an oven for drying, the diluent isopropanol is volatilized, a certain temperature is controlled for drying, and granulated in a screw extruder. The resulting product was subjected to performance testing.
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