Polyurethane rubber-lined composite pipeline and preparation method thereof

The invention discloses a polyurethane rubber-lined composite pipeline and a preparation method thereof, and relates to the field of pipelines, polytetrahydrofuran is added into a three-necked flask, a catalyst and sodium hydroxide are added, epoxy chloropropane is dropwise added into the three-necked flask to obtain an intermediate A, the intermediate A is added into distilled water, concentrated sulfuric acid is added to obtain an intermediate B, the intermediate B, 1, 4-butanediol and toluene diisocyanate are uniformly stirred; the problems that in the using process, an existing pipeline lining material is poor in toughness and low in tearing strength, a pipeline inner layer material is prone to damage, a steel pipe is corroded, and therefore the material leaks outwards, is prone to aging and is poor in abrasion resistance are solved. The number of macromolecular chains of modified polyurethane is increased, chain segments are increased, the macromolecular chains and a cross-linked network structure form a