Flame retarding type PVC double-wall pipe and manufacturing method thereof

Abstract

The invention relates to a flame retarding type PVC double-wall pipe, and the pipe wall of the double-wall pipe is formed by a double-layer structure. The inner layer comprises the following raw materials: polyvinyl chloride, chlorinated polyvinyl chloride, polymethyl methacrylate, aluminium hydroxide, polypropylene carbonate, a plasticizer, light calcium carbonate; the outer layer comprises the following raw materials: polyvinyl chloride, polybutyl ester, methacrylic acid-butadiene-styrene copolymer, sodium polyacrylate, aluminium hydroxide, polypropylene carbonate, polyethylene-acrylate rubber, aromatic polycarbonate, a plasticizer, etc. Both the inner and outer layer materials of the pipe are added with flame retarding and high temperature-resistant materials. Polypropylene carbonate will be decomposed to generate a large amount of carbon dioxide when heated in a burning condition so as to dilute the oxygen around to achieve the flame retarding purpose. The sodium polyacrylate playsroles in moisture absorption and preservation so as to increase humidity in the small environment around the PVC pipe to some degree, reduce temperature, and improve the heat resistance and flame retarding property of the PVC pipe.

Description

technical field [0001] The invention relates to the field of PVC pipes, in particular to a flame-retardant PVC double-wall pipe and a preparation method thereof. Background technique [0002] PVC (Polyvinylchlorid) pipe is a type of pipe mainly composed of polyvinyl chloride. At present, PVC double-wall pipe is a relatively fast-growing product in China. This product saves raw materials, low engineering cost, convenient construction, smooth inner wall, low friction coefficient, large flow rate, and wide application range. At present, the flame retardancy of PVC double-wall pipes is poor, which hinders the wider use of PVC double-wall pipes. The flame retardants usually used contain halogen or phosphorus. The flame retardant effect of halogen or phosphorus is obvious, but it is also relatively harmful to the environment. For example, dioxins are produced when halogen-containing flame retardant materials are burned, which can exist in the environment for many years, and even ...

AI Technical Summary

Problems solved by technology

At present, the flame retardancy of PVC double-wall pipes is poor, which hinders the wider use of PVC double-wall pipes. The flame retardants usually used contain halogen or phosphorus.

The flame retardant effect of halogen or phosphorus is obvious, but it is also relatively harmful to the environment. For example, dioxins are produced when halogen-containing flame retardant materials are burned, which can exist in the environment for many years, and even accumulate in organisms for life; phosphorus will cause water quality deterioration. Eutrophication, serious water pollution