Coating, injection needle and method for manufacturing the same

A method for manufacturing a coating applied on an injection needle for transporting adhesive, the injection needle comprising a tube, the method comprising:

• applying a hydroxylation treatment on the tube to form hydroxyl groups on an inner surface of the tube;
• immersing the tube in a slurry;
• wherein the slurry comprises a first monomer and a second monomer, the first monomer is selected from a silane containing at least one alkoxy and at least one alkyl, and the second monomer is selected from a silicate ester;
• applying a leveling treatment on the slurry adhered to the inner surface of the tube;
• and
• curing the slurry to form the coating on the inner surface of the tube;
• wherein, the alkyl in the silane and a alkyl in the silicate ester are independently selected from a group consisting of substituted alkyl and unsubstituted alkyl;
• the silane comprises at least one selected from a group consisting of monosilane and bisilane;
• the silicate ester comprises at least one selected from a group consisting of monosilate ester and bisilate ester;
• an angle for the leveling treatment applied on the slurry is in a range of 45 degrees to 90 degrees;
• a time period of the leveling treatment applied on the slurry is in a range of 0.1 h to 1 h;
• a temperature for curing the slurry is in a range of 70 degrees Celsius to 80 degrees Celsius;
• and a time period for curing the slurry is in a range of 2 h to 6 h.