Superhard non-stick silicon cooker coating prepared by sol-gel hybridization technique

[0038] B. Preparation of silica sol: use sol-gel to synthesize silica sol, accurately control the characteristics of silica sol, such as particle shape, solid content (30-40% in general), particle size: 80-120nm, SiO 2 Particle porosity: 40-60%, dispersion medium: absolute ethanol, Ph value: 8-10.

[0039] C. Additives: An appropriate amount of additives can not only effectively improve the thermal stability of nano-ceramic coatings, but also have a significant effect on the mechanical strength of the coatings. Al2O is introduced through natural mineral raw materials, kaolin, talc, wax stone, etc. 3 , SiO 2 , ZrO 2, MgO and other components to improve the comprehensive performance of nano-ceramic coatings.

[0041] Step 1. Modification: Take 40% of nano-silica and place it in an ultrasonic cleaner, add 0.6% silane coupling agent, ultrasonically disperse for 30 minutes, transfer to a magnetic stirrer, add 0.4% silane coupling agent, and stir at a high speed of 1.0 Filter after ~5.0 hours;

[0042] Step 2, solization: first add 30% ethyl orthosilicate, 0.4% silane coupling agent and 10% absolute ethanol into the beaker, stir for 20 minutes to mix the three evenly; then press ethyl orthosilicate Add 15% distilled water at a ratio of 2:1 to distilled water, and stir for 25 minutes to mix the two evenly;

[0043] Step 3, gelation: add 8% magnesium and calcium compounds (0.2mol / L magnesium carbonate, calcium carbonate solution) to the mixed solution, keep stirring for 2.0 hours, so that the hydrolysis reaction is complete, and the silica sol can be obtained , then seal it with plastic film, and let it stand for about 24 hours; then fully soak the quartz plate in chromic acid washing so...