Preparation Of Potassium Silicate Having A High Silica To Potassium Oxide Ratio And Its Zinc-Rich Coatings

In view of environmental protection, water-borne inorganic zinc-rich coatings, especially for whose binder used is potassium silicate solutions, become one of the most hopeful categories available today in the field of heavy-duty anticorrosion, for its cheap cost and outstanding performance.In the present work, mix-solve progress was adopted to prepare the higher SiO2 to K2O molar ratio and excellent stability potassium silicate solutions, Which has been discussed about the influence of reaction time, reaction temperature, various silica sols, and agitation speed on the preparation of high SiO2 to K2O molar ratio potassium silicate solutions, and which is compared to the similar products each other in terms of their properties. From the experimental results, we concluded as following:(1) Selected self-preparing silica sols, the colorless, translucent, and high SiO2 to K2O molar ratio potassium silicate solutions can be prepared with mix-solve process, which is easy to produce in batches, for rich materials, cheap cost, simple procedure.(2) The optimum preparation conditions of potassium stabilized silica sol are shown that the reaction temperature is 75℃, the time is about 5 hours, 400 mashes silicon powder and 1% potassium hydroxide are selected.(3) Self-preparing products were as excellent as one abroad, but more excellent than one at home.(4) Compared to properties each other, it was shown that the potassium silicate zinc-rich coatings have very good comprehensive properties, for example, good quick-curing, excellent water resistance, and outstanding adhesion. As for the potassium silicate zinc-rich coatings, the optimum SiO2 to K2O molar ratio is about 5.3.