The curing agents for polyether waterproof coatings are mainly the following:
Terminated silane polyether resin:
Silane-terminated polyether resin, also known as silane-modified polyether resin or silicone-modified polyether resin, was developed and industrialized by Kaneka Chemical Industry Co., Ltd. (Kaneka) of Japan, and its trade name is "Kaneka MS polymer". Its typical structure is that the terminal group is silaneoxy (Si-OR) and the main chain is polyoxypropylene structure. The preparation methods of silane-terminated polyether resin include isocyanate method, addition synthesis method, epoxy ring-opening synthesis method and hydrosilylation method. Among them, the silane-terminated polyether resin prepared by hydrosilylation method has very good durability, aging resistance and low viscosity, which is conducive to the preparation and construction of coatings.
Polyether amine:
Polyether amine is a commonly used curing agent with the characteristics of low viscosity, long application period, good adhesion and good flexibility. For example, Jeffamine-D230 is a polyetheramine curing agent with low viscosity and long pot life, suitable for structural adhesives, building materials, composite materials, casting and encapsulation, etc. Its curing conditions are 2 hours/80°C + 3 hours/125°C, and the properties after curing include gel time greater than 550 minutes, glass transition temperature between 67~78°C, tensile strength of 65~67MPa, flexural strength of 95~98MPa, and impact strength of 74~81J/m.
These curing agents have excellent properties in polyether waterproof coatings, such as cold resistance, heat resistance, weather resistance and durability, and are suitable for various building waterproofing needs.