The invention discloses a composition of a medical
catheter lubricating
hydrophilic coating and a preparation method of the composition, belongs to the technical field of medical materials, and aims to solve the problems of excessive swelling, poor combination stability, short
service time, low cost and the like caused by uniform water absorption of a
coating formed by curing a medical
catheter hydrophilic lubricating
coating composition in the prior art. In order to overcome the defects that an existing improvement scheme depends on a complex process, is high in cost and is easy to layer, the invention relates to the technical field of
medical instruments, and comprises the following components in percentage by
mass: 7-10% of
polyvinylpyrrolidone; 1.5 to 2.5 percent of
polyethylene glycol diacrylate; 0.8 to 1.2 percent of a
silane coupling agent KH-570; the content of the medical grade 2-hydroxy-4-methoxyacetophenone is 0.1 to 0.2 percent; 62-68% of absolute ethyl
alcohol; 14 to 18% of deionized water; 0.1 to 0.3 percent of
chlorhexidine acetate; and 0.2 to 0.5 percent of
citric acid. The composition has the property of spontaneously forming a gradient cross-linked structure, the gradient water absorption characteristic can be achieved under the conditions of conventional
coating and single-condition curing, extra precise
process control is not needed, the industrialization difficulty and cost are reduced, and meanwhile the problem that the
binding force between multiple coatings is poor is solved.