The main anticorrosive materials at the current stage-heat shrink sleeves and heat shrink tape

     The construction of long-distance pipelines must use anti-corrosion materials, because the welding joints of long-distance pipelines are most susceptible to corrosion. Generally, the main anti-corrosion materials at the current stage are heat-shrinkable sleeves and heat-shrinkable belts.

     The reason why 3PE heat shrinkable tape and 3PE heat shrinkable sleeve are widely used is mainly because they have good advantages: strong adhesion, good waterproof and sealing performance, no pollution to the environment, excellent wear resistance, corrosion resistance, Impact resistance and good resistance to UV and photo-aging. The heat-shrinkable tape and heat-shrinkable sleeve have memory after radiation crosslinking. The heat-shrinkable tape and heat-shrinkable sleeve made of this substrate have greatly improved tensile strength and tensile strength and strong stability. High adaptability to various environments.

     At present, the heat shrinkage properties of polyethylene at home and abroad are mostly achieved through the memory effect of cross-linked polyethylene polymers. The cross-linking method of polyethylene is mainly high-energy radiation cross-linking. The high-energy particle beams generated by the electron accelerator are used to irradiate the polyethylene, which causes the cremation center of the polyethylene molecular chain to form a C-C cross-link. The heat-shrinkable tape and heat-shrinkable sleeve are made of polyethylene by cross-linking by radiation, so that the polyethylene molecule is changed from a linear structure to a net-like structure to make a heat-shrinkable sleeve or belt-shaped product. The inner surface of this product Apply a hot-melt adhesive. When the heat-shrinkable sleeve and the heat-shrinkable tape shrink by heating, the adhesive melts, and after cooling and shaping, it acts as an adhesive seal. This type of heat shrinkable sleeve and tape are used as the material for the welding of the pipeline welding, and have excellent sealing performance.

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现阶段主要的补口防腐材料-热缩套和热缩带

     长输管线的建设必须要用到补口防腐材料，因为一般长输管线的焊口是最容易受到腐蚀，一般现阶段主要的补口防腐材料是热缩套和热缩带。

     3PE热缩带与3PE热缩套之所以得到广泛应用，主要是其有着很好的优点：黏结力强、防水性和密封性能较好、不污染环境，具有优异的耐磨损、耐腐蚀、抗冲击以及良好的抗紫外线和光老化性能。热缩带和热缩套在辐射交联后，具有记忆性，由这种基材经加工而成的热缩带和热缩套，其拉伸强度、抗拉力大大提高，稳定性强，对各种环境的适应度高。

     目前国内外聚乙烯的热收缩性能大都通过交联聚乙烯高聚物的记忆效应来实现。聚乙烯的交联方式主要为高能辐射交联。利用电子加速器产生的高能粒子射线对聚乙烯进行辐射，使聚乙烯分子链伤产生火化中心而形成C-C型交联。热缩带和热缩套为聚乙烯采用辐射的方式进行交联，使聚乙烯分子由线型结构变成网状结构而制成具有受热收缩性能的套或者带状制品，这种制品内表面涂敷一种热熔性黏结剂，当热缩套和热缩带加热收缩时，黏结剂熔化，冷却定型后起到黏结密封的作用。这种补口热缩套和带作为管道焊接处的补口材料，具有极好的密封性能。