Halogen-free flame retardant TPU (Thermoplastic Urethane) glue coating material and preparation method thereof

Abstract

The invention belongs to the technical field of chemical synthesis, and particularly relates to a halogen-free flame retardant TPU (Thermoplastic Urethane) glue coating material and a preparation method thereof. The halogen-free flame retardant TPU glue coating material is prepared from the following raw materials including polyhydric alcohol, diisocyanate, chain expanding agents, antioxidants, light stabilizers, catalysts, halogen-free main flame retardants, cooperated flame retardants and plasticizing agents. The halogen-free main flame retardants are one or several kinds of materials from organic hypophosphorous acid metal salts, rare earth hypophosphorous acid salt or melamine derivative series flame retardants; the cooperated flame retardants are one or several kinds of materials fromaluminum hydroxide, magnesium hydrate, aluminum oxide or magnesium oxide. The invention also provides the preparation method of the halogen-free flame retardant TPU glue coating material. According to the method, the polyhydric alcohol, the diisocyanate and the chain expanding agents are mixed; auxiliary agents dispersed by the plasticizing agents are continuously added through a lateral feedingopening; then, extrusion processing and granulation is performed through screw extrusion; a finished product is obtained. The halogen-free flame retardant TPU glue coating material has the advantagesthat the flame retardant performance, the mechanical property and the processing performance are excellent; the self extinguishing effect can be realized; halogen hydride gas with toxic and harmful effect on the environment is not generated during the combustion in the air; the efficiency is high; the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a halogen-free flame-retardant TPU encapsulation material and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane elastomer has good chemical corrosion resistance, electrical insulation, low temperature flexibility, wear resistance and weather resistance, prolongs the durability and service life of the material, and is widely used. However, TPU itself has poor flame retardancy, and has disadvantages such as flammability, large smoke generation, and molten droplets, which restrict its application in automotive parts and other fields. At the same time, in terms of composite modification processing application technology, secondary processing is used in the actual processing process. The finished TPU product is mixed with a physical property enhancer, and then secondary processing is performed through a single-screw or twin-s...

AI Technical Summary

Problems solved by technology

However, TPU itself has poor flame retardancy, and has disadvantages such as flammability, large smoke generation, and molten droplets, which restrict its application in automotive parts and other fields.

At the same time, in terms of compound modification processing application technology, secondary processing is used in the actual processing process. The finished TPU product is mixed with a physical property enhancer, and then secondary processing is performed through a single-screw or twin-screw extruder. Secondary processing and granulation lead to high-temperature cracking of TPU products when they are melted and mixed at high temperature in the extruder, and solid additives and TPU products are easy to mix and disperse unevenly, resulting in poor fluidity of products, resulting in insufficient physical strength

Images