I. What is "Modification"?
Simply put, modification is the process of purposefully adjusting the surface or internal properties of a material through physical, chemical, or mechanical means to obtain properties that it previously lacked or possessed insufficiently, in order to adapt it to specific applications.
We can compare materials to "building blocks":
Before modification: It might have a smooth surface, be difficult to assemble, or not meet requirements in terms of color or strength.
After modification: We can apply an adhesive layer (to enhance adhesion), attach a textured surface (to change the surface morphology), or combine it with other materials (to build a composite system), making it easier to assemble, more robust, or giving it new functions such as conductivity or luminescence.
The key to modification lies in "leveraging strengths and compensating for weaknesses, creating value," aiming to solve practical problems such as dispersibility, compatibility, and functionality in material applications.
II. What does "Modification" mean in inorganic powder materials?
Inorganic powder materials (such as calcium carbonate, talc, silica powder, aluminum hydroxide, titanium dioxide, etc.) are widely used in plastics, rubber, coatings, adhesives, and paper industries, often as fillers or functional additives.
However, they often have some inherent shortcomings when used directly:
Hydrophilic and oleophobic surface: The surface is rich in polar hydroxyl groups, resulting in poor compatibility with most non-polar or weakly polar organic polymers (such as plastics and rubber).
Easy to agglomerate: Due to the small particle size and high surface energy, they easily aggregate into clumps, making it difficult to disperse them evenly.
Weak interfacial bonding force: The bonding between the powder and the polymer matrix is weak, easily becoming a weak point in the material under external force, affecting overall strength and toughness.
Therefore, in inorganic powder materials, "modification" mainly refers to "surface modification." Its core meaning is:
Using physical or chemical methods, a layer of modifier is coated or grafted onto the surface of the powder particles, thereby changing its surface physicochemical properties (such as polarity, surface energy, wettability, electrical properties, etc.), ultimately achieving three main goals: improving dispersibility, enhancing interfacial compatibility, and imparting or strengthening specific functions.
