Coupling agent is an important treatment agent with increasingly wide application fields, mainly used as an auxiliary agent for polymer composite materials. The biggest feature of the molecular structure of the coupling agent is that the molecule contains two groups with different chemical properties, one is an inorganic-philic group, which is easy to chemically react with the surface of inorganic substances; the other is an organophilic group, which can interact with Synthetic resins or other polymers that chemically react or form hydrogen bonds dissolve in them. Therefore, the coupling agent is called "molecular bridge", which is used to improve the interface between inorganic and organic substances, thereby greatly improving the performance of composite materials, such as physical properties, electrical properties, thermal properties, optical properties, etc.
The coupling agent was first used as a surface treatment agent for glass fibers in glass fiber reinforced plastics, and later used in rubber, plastics, coatings, inks, adhesives, wires and cables, resin sand casting, abrasives, fiberglass, artificial quartz stone, textiles It is widely used and has excellent performance in silane treatment fluid in recent years. In fact, the amount of silane used in the field of metal surface treatment is very small, and its content is basically 0.5-2% in the vitrification solution formula.
The naming principle of Fluorosilane coupling agent is usually to use fluorosilane as the main name, add the name of the substituent or silicon functional group, and note the position of the substituent or carbon functional group in the prescribed order, so as to obtain the chemical molecular formula name of the Fluorosilane coupling agent.
There are many kinds of coupling agents, mainly including Fluorosilane coupling agent, titanate coupling agent, aluminate coupling agent, bimetallic coupling agent, phosphate coupling agent, borate coupling agent, chromium complex And other coupling agents of higher fatty acids, alcohols, esters, etc. Currently, the most widely used are Fluorosilane coupling agent and titanate coupling agent, and the most commonly used in the rubber industry are silane, titanate and aluminate coupling agents. joint agent. Fluorosilane coupling agent is the earliest researched and applied coupling agent.
