Method for making thermally tempered glass comprising a non-abrasive, porous, SiO
The invention relates to thermally tempered safety glass comprising an non-abrasive and porous SiO 2 layer which is stable during sintering and has a refractive index of between 1.25 and 1.40. The inventive safety glass can be obtained by coating standard soda-lime glass with an aqueous coating solution having a pH value of between 3 and 8 and containing between 0.5 and 5.0 wt. % of [SiO x (OH) y ] n particles (0<y<4 and 0<x<2) having a particle size of between 10 and 60 nm, and a surfactant mixture. The coated glass is then dried, thermally hardened at temperatures of at least 600° C. for several minutes, and thermally tempered by a flow of air.
1. A method of manufacturing a safety glass, comprising:
coating a glass with an aqueous coating solution and a surfactant mixture, the aqueous coating solution having a pH of 3 to 8, containing 0.5 wt. % to 5.0 wt. % [SiO x (OH) y ] n particles, where 0<y<4 and 0<x<2 and n is an integer, the particles having a particle size of 10 nm to 60 nm so as to provide a coated glass;
drying the coated glass;
annealing the coated glass at temperatures of at least 600° C. for a period of 2 to 10 minutes; and
tempering the coated glass in an air flow.
2. The method as recited in claim 1 , wherein the glass is a soda-lime glass.
3. The method as recited in claim 1 , wherein the drying includes one of resting the glass at room temperature and accelerated drying the glass using an air flow.
4. The method as recited in claim 1 , wherein the tempering includes evenly tempering the coated glass on surfaces of both sides of the coated glass using an air flow.
5. The method as recited in claim 1 , further comprising performing an intermediate treatment on the coated glass prior to the annealing.
6. The method as recited in claim 5 , wherein the intermediate treatment includes dipping the coated glass in aqueous solution of inorganic salts or in pure water and subsequently annealing the coated glass at 50 to 300° C.
7. The method as recited in claim 1 , further comprising shaping the coated glass prior to the tempering.
8. The method as recited in claim 1 , wherein the safety glass is a cover of a solar panel.
9. The method as recited in claim 1 , wherein the safety glass is a cover of a photovoltaic cell.
10. The method as recited in claim 1 , wherein the safety glass is a windshield of a motor vehicle.
11. The method as recited in claim 1 , wherein the safety glass is a construction glazing.
12. The method as recited in claim 1 , wherein the pH of the aqueous solution is from 5 to 8.