Modified weather-resistant high-density polyethylene sheathing compound for bridge cables and method for preparing modified weather-resistant high-density polyethylene sheathing compound

Abstract

The invention discloses a modified weather-resistant high-density polyethylene sheathing compound for bridge cables. A method for preparing the modified weather-resistant high-density polyethylene sheathing compound includes mixing ultrahigh-molecular-weight polyethylene, high-density polyethylene, linear low-density polyethylene, low-density polyethylene, antioxidants and polyethylene wax with one another in high-speed mixers at normal temperatures to obtain mixtures, discharging the mixtures into parallel double-screw granulation units, melting and extruding the mixtures, granulating the mixtures under underwater conditions to obtain particles, dehydrating the particles, and then drying the particles to obtain modified high-density polyethylene particles; mixing the obtained modified high-density polyethylene particles, high-density polyethylene, carbon black parent materials, antioxidants and silicone parent materials with one another in the high-speed mixers at normal temperatures to obtain mixtures, discharging the mixtures into the parallel double-screw granulation units, melting and extruding the mixtures, granulating the mixtures under underwater conditions to obtain particles, dehydrating the particles, and drying the particles to obtain the modified weather-resistant high-density polyethylene black sheathing compound for the bridge cables. The modified weather-resistant high-density polyethylene sheathing compound and the method have the advantages that the sheathing compound is excellent in physical and mechanical properties, in particular, the ultraviolet resistance property and the environmental stress cracking resistance property, and various indexes of manufactured products conform to requirements of standards CJ / T297-2008 of housing construction departments.

Description

technical field [0001] The invention relates to a modified weather-resistant high-density polyethylene sheath material for bridge cables and a preparation method thereof, belonging to the field of new materials. Background technique [0002] The cables of large-scale bridges are the main load-bearing structure of the bridge. The cables of large-span bridges are divided into stay cables and suspension cables. The outer layers of the cables are extruded with two layers of high-density polyethylene sheath materials. The vinyl double-layer sheath structure, the outermost colored sheath material is to meet the special landscape requirements of the bridge. The cable sheath material is the first line of defense to protect the cables. Once the sheath material is cracked and damaged, the corrosive medium will directly enter the exposed steel wires, corrode the steel wires, and the corrosion of the stay cables will directly endanger the safety of the bridge. At this time, the cables m...

AI Technical Summary

Problems solved by technology

The cable sheath material is the first line of defense to protect the cables. Once the sheath material is cracked and damaged, the corrosive medium will directly enter the exposed steel wires, corrode the steel wires, and the corrosion of the stay cables will directly endanger the safety of the bridge. At this time, the cables must be replaced. , the cost of cable replacement is extremely high, which will cause major economic losses, and serious bridge collapse may occur, causing major safety disasters

[0003] At present, the sheath materials used by domestic cable manufacturers are all imported from abroad, and there is no qualified cable sheath material produced in China.