Anti-glare glass and manufacturing method therefor

Abstract

An anti-glare glass of the present disclosure has excellent anti-glare properties and visibility by forming glass in which polysilazane-derived surface unevenness are applied to a glass surface without mixing a heterogeneous element, and has remarkably improved wear resistance and durability since the polysilazane is changed for glass on the glass surface by thermal treatment.

Claims

1. A method of manufacturing an anti-glare glass, the method comprising: S1) preparing a coating composition consisting of 2 to 20 wt. % of polysilazane having a weight average molecular weight equal to or less than 30,000 g/mol and a residual amount of a single solvent; S2) spraying and coating the coating composition onto a glass surface; S3) removing the solvent of the coating composition coated on the glass surface within 60 seconds to form an uneven layer on the glass surface, wherein the unevenness is caused by the polysilazane; and S4) performing heat treatment, wherein the anti-glare glass has haze of 1 to 5% and transmittance equal to or greater than 90%.

2. The method of claim 1, wherein the heat treatment of S4) comprises performing heat treatment at a temperature of 400 to 700° C.

3. The method of claim 2, wherein the heat treatment of S4) includes performing primary heat treatment at a temperature of 50 to 200° C. and, then, performing secondary heat treatment at a temperature of 400 to 700° C.

4. The method of claim 1, wherein the polysilazane satisfies the following Chemical Formula 1: ##STR00002## wherein R.sub.1, R.sub.2, and R.sub.3 each independently comprise any one or two or more selected from hydrogen, an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, a group with a carbon group bonded directly to silicon, an alkylsilyl group, an alkylamino group, and an alkoxy group and n is an integer.

5. The method of claim 1, wherein the anti-glare glass has surface roughness of 1 to 20 nm.

6. The method of claim 1, wherein a mass of the coating composition coated per unit area of the glass in S2) is 5 to 15 g/m.sup.2.

7. The method of claim 1, wherein the coating composition has a viscosity of 0.5 to 2.0 cp.

Description

DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a graph showing surface roughness of a coating surface.

(2) FIG. 2 is an electron microscopic image.

BEST MODE

(3) Hereinafter, an anti-glare glass and a method of manufacturing the same will be described with regard to exemplary embodiments of the invention with reference to the attached drawings.

(4) Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this inventive concept belongs. In the following description of the present disclosure, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure unclear.

(5) Hereinafter, embodiments of the present disclosure will be described in detail with reference to the following examples. However, these examples are not intended to limit the purpose and scope of the embodiments of the present disclosure.

Inventive Example 1

(6) 50 g of inorganic polysilazane with a weight average molecular weight of 15,000 and 950 g of an ortho-Xylene (available from SK Chemicals) solvent were put in a reactor and were mixed and stirred in 10 minutes to prepare a coating composition. The coating composition was coated onto a glass plate with a size of 50 cm×50 cm using a spray gun (spray pressure of 20 psi and a spray quantity of 10 g/m.sup.2) and, then, was dried within 60 seconds for 2 minutes under a hot blast condition of 80° C. to remove the solvent. Then, primary heat treatment using a heat curing method was performed on the resultant at a temperature of 150° C. for 5 minutes and secondary heat treatment using a heat curing method was performed on the resultant at a temperature of 450° C. for 60 minutes to prepare an anti-glare glass.

Inventive Example 2

(7) An anti-glare glass was prepared in the same manner as in Inventive Example 1 except that 70 g of inorganic polysilazane and 930 g of a solvent were used instead of 50 g of the inorganic polysilazane and 950 g of the solvent.

Inventive Example 3

(8) An anti-glare glass was prepared in the same manner as in Inventive Example 1 except that 90 g of inorganic polysilazane and 910 g of a solvent were used instead of 50 g of the inorganic polysilazane and 950 g of the solvent.

Inventive Example 4

(9) An anti-glare glass was prepared in the same manner as in Inventive Example 1 except that 120 g of inorganic polysilazane and 880 g of a solvent were used instead of 50 g of the inorganic polysilazane and 950 g of the solvent.

Inventive Example 5

(10) An anti-glare glass was prepared in the same manner as in Inventive Example 1 except that 180 g of inorganic polysilazane and 820 g of a solvent were used instead of 50 g of the inorganic polysilazane and 950 g of the solvent.

Inventive Example 6

(11) An anti-glare glass was prepared in the same manner as in Inventive Example 1 except that 940 g of a solvent was used instead of 940 g of a solvent and 10 g of organic polysilazane with a weight average molecular weight of 2,000 was further put into a reactor.

Inventive Example 7

(12) An anti-glare glass was prepared in the same manner as in Inventive Example 1 except that the coating composition was dried after 100 seconds to remove a solvent instead of drying the coating composition within 60 seconds to remove a solvent.

Comparative Example 1

(13) An anti-glare glass was prepared in the same manner as in Inventive Example 1 except that 9 g of inorganic polysilazane and 991 g of a solvent were used instead of 50 g of the inorganic polysilazane and 950 g of the solvent.

Comparative Example 2

(14) An anti-glare glass was prepared in the same manner as in Inventive Example 1 except that a coating composition was coated for 5 seconds at speed of 2 g/seconds via flow coating instead of coating the coating composition using the spray gun.

Comparative Example 3

(15) An anti-glare glass was prepared in the same manner as in Inventive Example 1 except that inorganic polysilazane with a weight average molecular weight of 40,000 was used instead of inorganic polysilazane with a weight average molecular weight of 15,000.

(16) Test and Measurement Method

(17) 1. Transmittance

(18) Transmittance of an area of 500 nm was measured using UVV is spectrophotometer (SCINCO, S3100).

(19) 2. Haze (Anti-glare)

(20) Haze was measured using a haze meter (HM150 available from Murakami Color Technology Laboratory).

(21) 3. Viscosity

(22) Viscosity was measured using a viscometer (VL700 available from Hydramotion).

(23) 4. Hardness

(24) The hardness of a pencil was measured using MITSU-BISHI PENCIL.

(25) Measurement Result

(26) TABLE-US-00001 TABLE 1 Content of coating polysilazane Transmittance composition Thickness (%) Haze (%) (%) viscosity (cp) (nm) hardness Inventive 5 2.04 91.8 1.12 210 9H Example 1 Inventive 7 2.19 91.7 1.17 246 9H Example 2 Inventive 9 2.52 91.2 1.29 271 9H Example 3 Inventive 12 2.65 90.9 1.36 298 9H Example 4 Inventive 18 2.85 90.3 1.49 335 9H Example 5 Inventive 6 2.85 92.3 1.15 335 9H Example 6 Comparative 0.9 0.18 92.8 1.01 94 9H Example 1 Comparative 5 0.21 93.9 1.12 987 9H Example 2 Comparative 5 9.34 86.4 1.56 753 9H Example 3

(27) Comparing Inventive Examples 1 through 5, as content of inorganic polysilazane increases, transmittance had a tendency of being reduced and haze had a tendency of being increased.

(28) The anti-glare glass prepared by coating the coating compositions according to Inventive Examples 1 through 6 had excellent anti-glare characteristics with haze less than 5% and transmittance of 90% or greater. It was seen that the anti-glare glass prepared by coating the coating composition according to Inventive Example 6 further included organic polysilazane to have more enhanced transmittance while having appropriate haze.

(29) On the other hand, it was seen that the anti-glare glass according to Comparative Example 1 was prepared using inorganic polysilazane, the content of which is lowered to 0.9% and, in this case, haze was remarkably lowered and anti-glare disappeared.

(30) On the other hand, the anti-glare glass according to Comparative Example 2 was prepared of a coating composition using a flow coating method, which was a general transparent glass with haze of 0.21% and without surface roughness and has no anti-glare characteristics.

(31) It was seen that the anti-glare glass according to Comparative Example 3 was prepared of inorganic polysilazane with a weight average molecular weight of 30,000 or greater and, here, curing was promoted even via exposure to air, surface roughness of a coating layer become serious, haze was increased, and transmittance was remarkably reduced. Accordingly, it was seen that anti-glare characteristics were remarkably reduced.

(32) Accordingly, it was seen that, depending on the content of the polysilazane, there was a significant difference in anti-glare and transmittance and a variable for maximizing the anti-glare and the transmittance was significantly affected by the content of the polysilazane (or viscosity depending on the content of the polysilazane), i.e., a composition ratio.

(33) In particular, it was seen that, in Inventive Examples 1 and 7, a degree by which unevenness is formed was changed depending on a time of removing a solvent after the coating composition was sprayed and, in Inventive Example 7, haze and transmittance were very poor compared with Example 1.