CN102676073A - Production method of pipeline joint coating heat-shrinkable pressure-sensitive tape - Google Patents

Abstract

The invention provides a production method of a pipeline joint coating heat-shrinkable pressure-sensitive tape used for repairing joint coatings of in-service oil-gas transmission pipelines and constructing joint coatings of newly-built pipelines, which relates to the technical field of ordinary anticorrosion of metal materials and pipeline systems. The structure of the heat-shrinkable pressure-sensitive tape is that the outer layer of the heat-shrinkable pressure-sensitive tape is provided with a radiant crosslinked polyethylene substrate, and the inner layer of the heat-shrinkable pressure-sensitive tape is provided with a butyl rubber modified polyisobutene pressure-sensitive adhesive, wherein the thickness of the radiant crosslinked polyethylene substrate is greater than or equal to 1.2mm and the thickness of the butyl rubber modified polyisobutene pressure-sensitive adhesive is greater than or equal to 1.3mm. The production process flow of the heat-shrinkable pressure-sensitive tape is that: the substrate raw material is extruded, inspected and irradiated, the pressure-sensitive adhesive is kneaded, extruded and inspected, adhesive is coated on the irradiated substrate, and both the raw materials are inspected, slit, packaged, finally inspected and stored/delivered. The production method has the advantages that the production process is simpler, a product has a reliable anticorrosion effect and long-acting and reliable bonding force, defects can be self-repaired, the adaptability is strong and the efficiency is high.

Description

The working method of the roasting Pressure Sensitive Tape of a kind of joint coating on pipeline heat

Technical field

The present invention is a kind of working method that is applicable at the roasting Pressure Sensitive Tape of joint coating on pipeline heat of repaired mouth reparation of labour oil/gas pipe line and newly-built pipeline field joint construction, relates to the general corrosion protection and the tubing system technical field of metallic substance.

Background technology

3PE is that nearly ten years China's long distance pipelines are used pipeline external anti-corrosion layer material the most widely; Transfer natural gas from the west to the east a line, two wires, western pipeline, capital, Shan one, two, three-way etc. built or all adopted the 3PE external anti-corrosion layer apart from the oil and gas pipeline main line in the length of building; And radiant crosslinked polyethylene shrink belt (cover) is the preferred manner of domestic 3PE anticorrosive coating repaired mouth; Also be the mature technology of generally acknowledging both at home and abroad at present, and widely apply in the actual at home and abroad engineering.But in the inside and outside detection of the pipeline that carries out in recent years, found the comparatively serious pipe body corrosion in shrink belt repaired mouth place, its major cause is: the bonding poor stability of hot melt adhesive itself and body PE; The inefficacy of hot melt adhesive in environment for use; The ununiformity of on-the-spot manual baking construction temperature etc.This shows that China's long-distance transport pipes shrink belt repaired mouth is difficult to guarantee construction quality at present.

CN1032180A discloses a kind of adhesive for thermal shrinkable band, for the rare strong bonding force of high-density polyethylene.But it is a kind of caking agent, is not the roasting contraction bands of heat, the working method of the roasting contraction bands of also unexposed heat.

Summary of the invention

The objective of the invention is to invent a kind of be used for pipeline corrosion protection repaired mouth production technique comparatively simple, mix up preservative effect reliable, have the long-term and reliable cohesive force, defective had the working method of self-repair function, flexibility is strong, efficient the is high roasting Pressure Sensitive Tape of joint coating on pipeline heat.

The constitutional features of the roasting Pressure Sensitive Tape of the present invention's heat is: outer is the radiant crosslinked polyethylene base material, and nexine is a butyl rubber modification polyisobutene pressure-sensitive adhesive.Thickness >=the 1.2mm of radiant crosslinked polyethylene base material, the thickness >=1.3mm of butyl rubber modification polyisobutene pressure-sensitive adhesive.

Because this material adopted butyl rubber modification polyisobutene pressure-sensitive adhesive, do not need the heating and melting can realization and the bonds well of coated articles such as PE, iron and steel.

The basic mechanical design feature of the roasting Pressure Sensitive Tape of heat is seen table 1, table 2, table 3, table 4.

Roasting Pressure Sensitive Tape thickness unit: the mm of table 1 heat

Base material	Glue-line
		≥1.2	≥1.3

The performance index of the roasting Pressure Sensitive Tape base material of table 2 heat

The performance index of the roasting Pressure Sensitive Tape glue-line of table 3 heat

The performance index of the roasting Pressure Sensitive Tape installation system of table 4 heat

The working method of the roasting Pressure Sensitive Tape of heat is seen Fig. 1: base material raw material → extrude → check → irradiation, pressure-sensitive adhesive raw material → kneading extrude → check → and toward gluing on the base material behind the irradiation → check → cut packing → examine eventually → put in storage/dispatch from the factory.

The raw material of butyl rubber modification polyisobutene pressure-sensitive adhesive is mixing evenly through mixing roll; At the uniform velocity extrude through kneader, a multimode twin screw extruder again; Through the extruding of cooling pressure roller machine; Evenly be coated on the process radiant crosslinked polyethylene base material of thickness >=1.2mm, promptly process the roasting Pressure Sensitive Tape opening-supplementing material of heat.

Wherein mixing roll, kneader, a multimode twin screw extruder, cooling pressure roller machine and coating machine are city's pin product, select for use to get final product.

The roasting Pressure Sensitive Tape production technique of heat of calendering modification polyisobutene pressure sensitive adhesive is comparatively simple on the Vilaterm base material layer of the present invention, can solve the preventing corrosion of repaired mouth problem of old pipeline repaired mouth reparation and newly-built pipeline.This opening-supplementing material is compared with opening-supplementing materials such as shrink belts, it is advantageous that:

A) the roasting Pressure Sensitive Tape production technique of heat is comparatively simple;

The roasting Pressure Sensitive Tape repaired mouth installation process of the heat of b) producing is simple: do not need the preheating mouth of pipe, do not need sandblast, only need manual floating rust of steel tube surface and the dirt removed, manual baking base material shrinks to put in place and gets final product, and does not need tempering, improves the repaired mouth installation efficiency greatly;

C) the roasting Pressure Sensitive Tape preservative effect of heat is reliable: have the long-term and reliable cohesive force, defective is had self-repair function;

D) the roasting Pressure Sensitive Tape flexibility of heat is strong: can construct down by low temperature, can adapt to the requirement in the repair of labour pipeline repaired mouth.

Description of drawings

The roasting Pressure Sensitive Tape technological process of production figure of Fig. 1 heat

Embodiment

Embodiment. the structure of the roasting Pressure Sensitive Tape of this heat is: outer is the radiant crosslinked polyethylene base material, and nexine is a butyl rubber modification polyisobutene pressure-sensitive adhesive.The thickness 1.2mm of radiant crosslinked polyethylene base material, the thickness 1.3mm of butyl rubber modification polyisobutene pressure-sensitive adhesive.

The production technique of the roasting Pressure Sensitive Tape of heat is seen Fig. 1: base material raw material → extrude → check → irradiation, pressure-sensitive adhesive raw material → kneading extrude → check → and toward gluing on the base material behind the irradiation → check → cut packing → examine eventually → put in storage/dispatch from the factory.

The raw material of butyl rubber modification polyisobutene pressure-sensitive adhesive is mixing evenly through mixing roll; At the uniform velocity extrude through kneader, a multimode twin screw extruder again; Through the extruding of cooling pressure roller; Evenly be coated on the process radiant crosslinked polyethylene base material of thickness 1.2mm, process the roasting Pressure Sensitive Tape opening-supplementing material of novel heat.

This example is through test, and the roasting Pressure Sensitive Tape working method of heat is comparatively simple, utilizes the roasting Pressure Sensitive Tape of heat of aforesaid method production to carry out repaired mouth, and repaired mouth efficient is high, construction is convenient, and the human factor influence is few, can guarantee the preserving and sealing property of pipeline, guarantees the joint coating on pipeline quality.

Claims (1)

1. one kind is applicable to the working method at the roasting Pressure Sensitive Tape of joint coating on pipeline heat of repaired mouth reparation of labour oil/gas pipe line and newly-built pipeline field joint construction; The structure that it is characterized in that the roasting Pressure Sensitive Tape of heat is: outer is the radiant crosslinked polyethylene base material, and nexine is a butyl rubber modification polyisobutene pressure-sensitive adhesive; Thickness >=the 1.2mm of radiant crosslinked polyethylene base material, the thickness >=1.3mm of butyl rubber modification polyisobutene pressure-sensitive adhesive;

The technological process of production of the roasting Pressure Sensitive Tape of heat is: base material raw material → extrude → check → irradiation, pressure-sensitive adhesive raw material → kneading extrude → check → toward gluing on the base material behind the irradiation → check → cut packing → examine eventually → put in storage/dispatch from the factory;

The raw material of butyl rubber modification polyisobutene pressure-sensitive adhesive is mixing evenly through mixing roll; At the uniform velocity extrude through kneader, a multimode twin screw extruder again; Through the extruding of cooling pressure roller machine; Evenly be coated on the process radiant crosslinked polyethylene base material of thickness >=1.2mm, promptly process the roasting Pressure Sensitive Tape opening-supplementing material of heat.

Images