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Titanate coupling agent, an all-round coupling agent
Release Date:
2021-06-08
Titanate coupling agent first appeared in the 1970 s. In December 1974, Kenrich Petrochemical Company of the United States reported a new type of coupling agent, which has a good coupling effect on many dry powders. Since then, inorganic filled polyolefin composite materials with titanate coupling agent have been published. In recent years, a series of titanate coupling agents developed by Kenrich companies in the United States have been widely used. Carbon black activated with titanate coupling agent, SiO2, CaCO3, metal oxides added to thermoplastics and rubber can reduce the system viscosity, improve toughness and mechanical properties. At present, titanate coupling agent has become one of the indispensable raw materials for composite materials.
Next, we will explain how the titanate coupling agent has these functions.
1. Structure of titanate coupling agent
Titanate coupling agents can be divided into four categories according to their chemical structures: monoalkoxy type, monoalkyl pyrophosphate type, chelate type and ligand type. The molecular formula of titanate coupling agent is:(RO )m Ti ( OX-R-Y)n, and its molecular structure determines that it has a variety of functions, and its functions are:
(1) (RO )m: through the R group and the inorganic filler surface hydroxyl reaction, the formation of the coupling agent of the monomolecular layer, so as to play the role of chemical coupling. Water and free protons (H) at the filler interface are reactive sites with the coupling agent.
(2) (O): can occur various types of ester conversion reaction, which can make the titanate coupling agent and polymer and filler cross-linking, but also with the epoxy resin in the hydroxyl esterification reaction.
③ X: is an atomic group bonded to titanium oxide, or a binding group, which determines the characteristics of the titanate coupling agent. These groups include alkoxy groups, carboxyl groups, sulfonyloxy groups, phosphonyloxy groups, phosphoryloxy groups, pyrophosphoryloxy groups, and the like.
R: is the long chain part of the titanate coupling agent molecule, mainly to ensure the entanglement and miscibility with the polymer molecules, improve the impact strength of the material, reduce the surface energy of the filler, so that the viscosity of the system is significantly reduced, and has good lubricity and rheological properties.
⑤ Y is a functional group for crosslinking with a titanate coupling agent, and includes an unsaturated double bond group, an amino group, a hydroxyl group, and the like.
⑥ n: reflects the number of functional groups contained in the titanate coupling agent molecule, and may be 1 to 3.
2. Structure determines application
① In the filled plastic, the filler can be activated, the filling amount can be increased, the amount of resin can be reduced, the cost of the product can be reduced, the processing performance can be improved, the gloss of the product can be increased, and the quality can be improved.
In rubber, the modified filler can play a reinforcing role, reduce the amount of rubber and antioxidant, improve the wear resistance and aging resistance of the product, and the surface gloss of the product.
③ can increase the amount of pigments, fillers in the paint, improve the dispersion performance; anti-precipitation effect, can prevent the color of flowers; can improve the film strength, so that its bright color. In addition, there are drying characteristics, so that the baking temperature is reduced and the baking time is shortened.
The application in the coating industry, can improve the corrosion resistance of the coating, to prevent the coating gel.
Application in the paper industry, can improve the dispersion of calcium carbonate or talc, greatly reduce the loss of loss, significantly improve the printing performance of paper.
⑥ Improve the gelling performance, heat resistance temperature and downhole permeability of the fracturing fluid, and significantly improve the oil recovery rate.
⑦ Significantly improve the dispersion of magnetic powder, enhance its affinity with the carrier, increase the amount of filling, increase the magnetic density, improve the magnetic signal.
⑧ Used in the adhesive, can enhance the adhesive force and so on.
Summary
In short, due to the special structure of titanium, it has a variety of unique functions. Countries all over the world are actively carrying out research on the application of titanium. Titanium is the fourth metal element in the earth's crust. China has abundant reserves. Therefore, the development and application of organic titanium compounds is the current international development direction. Its wide application range and remarkable effect are of great significance to the development of China's chemical industry and the improvement of product quality, cost reduction and efficiency improvement.
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