It is well known that improving the dispersibility, reinforcing properties and rheological properties of fillers and fibers in plastics has always been a basic application area for silane coupling agents and titanium (aluminum) coupling agents.
The silane coupling agent is particularly suitable for some surface modification of fibers having silicic hydroxyl groups on the surface, such as glass fibers, glass microbeads, silicon micropowder, wollastonite, kaolin, talc, aluminum hydroxide, magnesium hydroxide, and so on; However, there is no modification effect on fillers such as calcium carbonate, carbon black, graphite, barium sulfate and other fillers which have no silanol groups on the surface. At this time, you need to use titanate (aluminum) coupling agent to modify the surface of these fillers. In the modification effect of the silane coupling agent and the titanate (aluminum) coupling agent, the former is more advantageous for improving the rigidity indexes such as impact strength, tensile strength and flexural modulus, and the latter is often for improving the flexibility of the product. Such as elongation at break, notched impact, etc.
Typical applications of coupling agents in plastic filling, reinforcement, flame retardant, etc. include but are not limited to:
1. Fiber modification of various engineering plastics. Although the glass fiber has been surface treated by using a sizing agent that containing silane coupling agent in the production process, the empirical evidence shows that in the production of the fiber-added product, The addition of a few thousandths of the silane coupling agent still has a significant effect on the strength of the final product.
2, a variety of high-filled plastic products, such as PVC, PP, PE and other products filled with calcium carbonate, especially hard products, through the use of titanium (aluminum) ester coupling agent ,it can significantly improve the flexibility and processing rheological property of the product; low-smoke halogen-free fuel is filled with a large amount of inorganic flame retardant aluminum hydroxide ATH and magnesium hydroxide MGH, by using some silane coupling agent and titanium (aluminate) coupling agent the mechanical properties and processing rheological property of the product are obtained.