用于管道补口的聚氨酯改性环氧底漆涂料

底漆加热收缩带是长输管道常用的补口材料,在底漆干膜状态下包覆热收缩带会造成热收缩带与底漆间因黏接力低、容易渗水而导致补口处钢管腐蚀。该文研制了一种用于长输管道热收缩带补口的无溶剂聚氨酯改性环氧底漆涂料,利用聚氨酯中丰富的极性基团,增加与热溶胶的黏结能力,使涂料在湿膜或干膜状态下均与热收缩带具有良好的黏接性能,并具有优良的耐腐蚀性能,使底漆加热收缩带补口的施工质量得到控制。

Study on Epoxy Primer Modified by Polyurethane for Joint Coating of Pipelines

Heat - shrinkable wrap with primer is the most widely used joint technology for pipeline. The poor adhesion of heat - shrinkable wrap and primer is resulted from applying heat - shrinkable wrap at hard dry state of primer, resulting in easy water penetration which corrodes the pipelines. The solvent/ess epoxy primer modified by polyurethane, with richer polarity radicals, was prepared for heat - shrinkable wrap joint of pipeline to increase the adhesion with heat melt adhesive. The primer has both good anti - corrosion performances and adhesion to heat - shrinkable wrap at surface dry and hard dry states, and it is easy to control the construction quality of primer and heat - shrinkable wrap.