How do these technologies improve the dispersibility and compatibility of nano barium sulfate in polymer matrices?
Publish Time: 2025-01-09
As a high-performance inorganic material, nano barium sulfate is widely used in many fields due to its unique physical and chemical properties. However, due to its inherent hydrophilic and oleophobic properties and high surface activity, the dispersibility and compatibility of nano barium sulfate in polymer matrices are often poor, which limits its application effect. To solve this problem, surface modification technology came into being.The surface modification technology of nano barium sulfate mainly includes coupling agent modification, surfactant modification, precipitation reaction modification and inorganic coating modification. The core purpose of these technologies is to change the properties of the surface of nano barium sulfate by chemical or physical means, thereby improving its compatibility and dispersibility with the polymer matrix.Coupling agent modification is a commonly used method, which uses the amphiphilic structure of the coupling agent to connect the inorganic-philic group and the organic-philic group to play the role of a molecular bridge. Silane, titanate and aluminate coupling agents are commonly used modifiers. These coupling agents can react chemically with free protons or hydroxyl groups on the surface of nano barium sulfate to form chemical bonds, thereby forming an organic film on its surface and changing its surface properties.Surfactant modification is achieved by making one end of the surfactant molecule compatible with the polymer matrix and the other end physically adsorbing or chemically reacting with the surface of nano barium sulfate. Common surfactants include higher fatty acids and their salts, alcohols, amines, etc. This method is low-cost and easy to operate, and can effectively improve the dispersibility and compatibility of nano barium sulfate in polymers.Precipitation reaction modification is to form a coating film on the surface of nano barium sulfate through chemical precipitation reaction, thereby changing its surface properties. This method has low production cost and is easy to operate, but the uniformity and strength of the coating film need to be strictly controlled.Inorganic coating modification is to form an inorganic coating film on the surface of nano barium sulfate through physical action or van der Waals force to prevent its agglomeration and oxidation. Commonly used coating agents include titanium dioxide, silicon dioxide, etc. This method can effectively improve the stability and dispersibility of nano barium sulfate.In summary, there are many surface modification technologies for nano barium sulfate, and each method has its unique advantages and scope of application. By rationally selecting and applying these modification technologies, the dispersibility and compatibility of nano barium sulfate in polymer matrices can be significantly improved, expanding its scope of application.
