Method for removing surface compressive stress of toughened glass through chemical ion exchange

The invention provides a method for removing surface compressive stress of toughened glass through chemical ion exchange. The toughened glass is put into a mixed solution of potassium nitrate and sodium nitrate after preheating. K+ with a large ionic radius in the glass is replaced with Na+ with a small ionic radius in the solution through an ion exchange method. The concentration of the Na+ in the solution is maintained in 140000 ppm or above. According to the method for removing the surface compressive stress of the toughened glass through the chemical ion exchange, firstly, surface compressive stress removing is conducted on the toughened glass with the sand blasting effect, and then follow-up process treatment is conducted, so that product bending caused by the stress difference of the toughened glass can be avoided, the using rate of products is increased, and the high-flatness and high-quality toughened glass smooth surface is obtained. 本发明提供了种通过化学离子交换消除强化玻璃表面压应力的方法，将强化后的玻璃进行预热后，放入至硝酸钾和硝酸钠的混合溶液中，通过离子交换法