Radiation crosslinked polyethylene thermally-shrinkable cladded sheet materials and preparation method therefor

Abstract

The invention discloses a water-proof radiating crosslinking polyethylene heat-condensing clad piece of oil, chemical and insulating pipe, which is composed of polyethylene base and fusing gel layer, wherein the polyethylene, carbon black and chlorcosane are fused and crosslinked to mould, which are extended transversely through nuclear radiation; the fused gel is coated on the inner surface or inner periphery of base evenly; each hole is opened on the clad piece along two sides intervally, which fixes the interface of clad piece.

Description

technical field [0001] The invention relates to a radiation cross-linked polyethylene heat-shrinkable coating sheet for waterproofing of petroleum, chemical and heating insulation pipelines and a preparation method thereof. Background technique [0002] In order to ensure the normal transportation of the medium, petroleum and chemical pipelines usually use an external insulation layer for insulated transportation. Oilfield oil collection pipelines adopt blending or heat tracing processes to ensure the normal transportation of crude oil. The heat tracing pipelines are prefabricated into rigid polyurethane foam There are many unsolvable problems in the plastic jacket tube. Due to the short distance of the pipeline in the station, there are many welding joints and elbows, it is very inconvenient to use a rigid polyurethane foam jacket tube. The selection and use of thermal insulation and waterproof materials for heating pipelines and pipelines in the station are subject to cert...

AI Technical Summary

Problems solved by technology

[0003] The above method has the following fatal shortcomings in the application: 1. The construction process is complicated; 2. The construction is difficult, and the integrity of the waterproof layer cannot be guaranteed; 3. Most of the pipelines in the northern oilfield need to pass through low-lying areas such as rice fields and canals, causing the insulation layer to be damaged. Water ingress, thermal insulation failure and energy consumption increase, 4. Corrosion and perforation of pipelines caused by this; these problems have not been well resolved so far

[0004] The waterproof layer of the thermal insulation pipeline is the barrier of the thermal insulation layer. Even the best thermal insulation material, once the waterproof layer leaks, it will cause water to enter the thermal insulation layer and reduce the thermal insulation performance.