Example 5: preparation of hydrophilic coating

The polycarbonate plate (10 cm × 10 cm) was immersed in the solution of n-dibutyl ether with the concentration of 20% of the total hydropolysiloxane by the immersion device with the step motor speed of 20 cm / min. after staying for 10 s, it was withdrawn from the solution at the speed of 20 cm / min, let it drip for a short time, then exposed to air for 10 min, and then immersed in the aqueous solution of BYK lpn-6640 (10% concentration)（ The original solution is 40% and diluted with 3:1 water. After being placed in the solution for 24 hours, the coating is washed with water. The contact angle between the coating and water is determined to be below 10 °. The hydrophilic coating for stainless steel can also be made by the same method, and the contact angle of water is also below 10 °.