Translucent member and manufacturing method therefor

Abstract

To provide a translucent member which maintains an anti-fogging property for a prolonged period of time and is less susceptible to contamination by organic matter.SOLUTION: A translucent member is provided, comprising a translucent base material and a functional film provided on the base material, where the functional film comprises a porous layer containing multiple silicon oxide particles and a polymer-containing layer provided on a surface of the porous layer opposite the base material, the polymer-containing layer containing a hydrophilic polymer having a zwitterionic hydrophilic group. The ratio of an element originating from the polymer-containing layer and a silicon element is in a range of 0.15 to 0.40, inclusive from an uppermost surface of the functional film to a depth of 10 nm.SELECTED DRAWING: Figure 1

Claims

1. A light-transmitting member including a light-transmitting substrate and a functional film on the substrate, The functional film includes a porous layer containing a plurality of silicon oxide particles, and a polymer-containing layer provided on a surface of the porous layer opposite to the substrate, the polymer-containing layer comprises a hydrophilic polymer having zwitterionic hydrophilic groups; The functional film is a light-transmitting member in which an element derived from the polymer-containing layer interacts with silicon element.

2. A translucent member as described in claim 1, characterized in that the ratio of elements derived from the polymer-containing layer to silicon elements at a depth of 10 nm from the top surface of the functional film is 0.15 or more and 0.40 or less.

3. 2. The light-transmitting member according to claim 1, wherein the hydrophilic polymer having the amphoteric hydrophilic group has at least one of a sulfobetaine group, a carbobetaine group, and a phosphorylcholine group.

4. 2. The light-transmitting member according to claim 1, wherein the element derived from the polymer-containing layer is any element selected from the group consisting of nitrogen, phosphorus, and sulfur.

5. 5. The light-transmitting member according to claim 4, wherein the element derived from the polymer-containing layer is nitrogen.

6. 2. The light-transmitting member according to claim 1, wherein the functional film has a thickness of 50 nm or more and 200 nm or less.

7. 2. The light-transmitting member according to claim 1, wherein the refractive index of the functional film is 1.25 or more and 1.36 or less.

8. 2. The light-transmitting member according to claim 1, wherein the contact angle of pure water on the surface of the light-transmitting member on the functional film side is 30[deg.] or less.

9. 2. The light-transmitting member according to claim 1, wherein the plurality of silicon oxide particles are bound to one another by silicate.

10. (i) forming a porous layer containing silicon oxide particles on a light-transmitting substrate; and (ii) forming a coating film of a liquid containing a hydrophilic polymer having an amphoteric hydrophilic group on the porous layer to obtain a light-transmitting member; and (iii) A step of washing the light-transmitting member obtained in (ii) with water. A method for manufacturing a light-transmitting member, comprising:

11. 11. The method for producing a light-transmitting member according to claim 10, wherein in step (ii), the coating film is formed by dropping a liquid containing the hydrophilic polymer having the zwitterionic hydrophilic group onto the porous layer and spin-coating the liquid at a speed of 20 seconds or more and 1000 rpm or less.

12. 11. The method for producing a light-transmitting member according to claim 10, wherein in step (ii), the porous layer is brought into contact with a liquid containing the hydrophilic polymer having the zwitterionic hydrophilic group, and the contact time is from 20 seconds to 2 minutes.

13. 11. The method for manufacturing a light-transmitting member according to claim 10, wherein the hydrophilic polymer having an amphoteric hydrophilic group has at least one of a sulfobetaine group, a carbobetaine group, and a phosphorylcholine group.

14. 11. The method for manufacturing a light-transmitting member according to claim 10, wherein the liquid containing the hydrophilic polymer contains a solvent and hydrophilic polymer molecules, and the concentration of the hydrophilic polymer molecules is 0.3% by mass or more and 10% by mass or less.

15. 11. The method for producing a light-transmitting member according to claim 10, wherein in the step (iii), the light-transmitting member obtained in (ii) is immersed in water to which ultrasonic vibrations are applied.

16. 16. The method for producing a light-transmitting member according to claim 15, wherein ultrasonic vibrations of 20 kHz to 50 kHz and 200 W to 500 W are applied in the step (iii).

17. 17. The method for producing a light-transmitting member according to claim 16, wherein in the step (iii), washing with water, in which the immersion time in water is 30 seconds to 1 minute each time, is repeated three or more times.

18. 11. The method for producing a light-transmitting member according to claim 10, wherein in the step (i), a coating liquid containing silicon oxide particles having an average particle size of 10 nm to 80 nm and a solvent is applied and then heated.

19. 19. The method for manufacturing a light-transmitting member according to claim 18, wherein the silicon oxide particles are hollow particles.

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