Photoinitiator and preparation method thereof, ultraviolet curing resin and ultraviolet curing lining hose

The invention discloses a photoinitiator and a preparation method thereof, ultraviolet curing resin and an ultraviolet curing lining hose.The preparation method of the photoinitiator comprises the following steps that a white solid product C is dissolved in dichloromethane of triethylamine to obtain a C solution, TPO-L acyl halide is dissolved in an organic solvent to obtain a TPO-L acyl halide solution, and when the temperature is 0 DEG C, the TPO-L acyl halide solution is added into the organic solvent to obtain a TPO-L acyl halide solution; and dropwise adding a TPO-L acyl halide solution into the solution C, stirring for 20-28 hours at room temperature, carrying out quenching reaction, separating organic phases, extracting a water phase, merging the organic phases, washing, filtering and purifying to obtain the three-functionality photoinitiator. The photoinitiator synthesized by the invention contains four active groups, has strong activity, improves the transfer efficiency of free radicals, and is suita