Two-layer composite pipe and preparation method thereof

Abstract

The invention discloses a two-layer composite pipe which comprises an inner layer and an outer layer. A binding layer is arranged between the inner layer and the outer layer. The inner layer is prepared from, by mass, 43%-45% of ultra-high molecular weight polypropylene and 30%-32% of low-density polyethylene, the outer layer is prepared from, by mass, 2%-15% of modified nano calcium carbonate, 62%-70% of HDPE, 20%-28% of nano calcium carbonate and 0.5%-6% of lubricating agent, and the binding layer is formed by a coated binding agent prepared from raw rubber, butadiene styrene rubber, silicasolution, refractory mortar, pitch, rosin, silicon dioxide, zinc oxide, water and diethylenetriamine. The two-layer composite pipe has the beneficial effects that the good ultraviolet light resistanceand nuclear radiation resistance, flexibility and excellent wear resistance and durability are achieved, the binding agent is good in compatibility, capable of being dried by itself at normal temperature, nontoxic, odorless and high in adhesive force, the modified nano calcium carbonate and the nano calcium carbonate are added to enable the composite material to have the better mechanical property, and the pipe has the better toughness, better hardness and higher environment stress cracking resistance compared with an HDPE two-wall corrugated pipe.

Description

technical field [0001] The invention relates to the technical field of composite pipe production for water supply engineering, in particular to a double-layer composite pipe and a preparation method thereof. Background technique [0002] At present, the idlers used in many domestic conveying machinery industries include steel pipes, nylon pipes, steel-coated rubber pipes, steel-coated PE pipes, etc. The simple use of steel pipes as idlers has defects such as easy rust, large frictional resistance, and serious wear on the conveyor belt. ; while using nylon tubes as rollers, the production length can only be within 500mm, and once it is extended, it cannot carry a large load; although the rubber covered with steel tubes has good elasticity, it also has the defect of large frictional resistance; For polyethylene pipes, although the interference fit can be used to reduce the gap between the steel pipe and the polyethylene pipe of the jacket during assembly, a certain amount of h...

AI Technical Summary

Problems solved by technology

[0002] At present, the idlers used in many domestic conveying machinery industries include steel pipes, nylon pipes, steel-coated rubber pipes, steel-coated PE pipes, etc. The simple use of steel pipes as idlers has defects such as easy rust, large frictional resistance, and serious wear on the conveyor belt. ; while using nylon tubes as rollers, the production length can only be within 500mm, and once it is extended, it cannot carry a large load; although the rubber covered with steel tubes has good elasticity, it also has the defect of large frictional resistance; For polyethylene pipes, although the interference fit can be used to reduce the gap between the steel pipe and the polyethylene pipe of the jacket during assembly, a certain amount of heat will be generated after friction during operation, and the polyethylene casing will be exposed to heat after being heated. Diameter expansion, resulting in slippage, and the service life is affected to a certain extent

In order to solve the adhesion problem, the method of increasing the adhesive is used in the prior art, but because the pipe use environment is relatively corrosive and especially in the cold north, it still falls off after a period of use