Preparation And Properties Study Of CaO-B₂O₃-SiO₂ Phase-Separation Hydrophilic Self-Cleaning Glaze

Ceramic products are closely related to people's life.With the improvement of people's living standards,people pay more and more attention to the cleaning of ceramic products.The large use of detergent has an impact on human body and natural environment.It is of great significance to develop ceramic glaze with easy cleaning function.Superhydrophilic phenomenon is an important wetting behavior in surface wetting.The surface of material with superhydrophilic property has strong affinity with water.When water spreads on the surface,it is easy to penetrate under the dirt,so that the dirt and material surface can be separated automatically to realize self-cleaning function.Using feldspar,kaolin,quartz and other natural mineral raw materials,the hydrophilic ceramic glaze was prepared by the method of frit glaze in this experiment.The Ca O-B₂O₃-SiO₂phase-separation hydrophilic ceramic glaze with good hydrophilic effect and high surface hardness was prepared by exploring the technological conditions and the composition of frit formula.Based on the basic principle of solid surface free energy,the surface energy of hydrophilic glaze is calculated by contact angle measurement method,and the composition is calculated by OWRK geometric average method.The influence of different SiO₂ / Al₂O₃ on the surface free energy and hydrophilic property of glaze is explored.The results show that the hydrophilicity is better when the polar component of surface energy is larger.When the content of Al₂O₃ is 0.45 mol,the proportion of polar component is more than 80%,and its wetting angle is small,which has good hydrophilic effect;and when the content of SiO₂ is 3.5mol,the minimum wetting angle of glaze is 10.44 °.When the content of Al₂O₃ is too high or too low,the wettability angle of the samples shows a large value,which is not conducive to the hydrophilicity of the glaze.To explore the influence of B₂O₃ content on the effect of glaze phase separation,the fine and dense phase separation droplets are produced by phase separation to build a special rough glaze to achieve hydrophilic effect.The experimental results show that the content of B₂O₃ has a good effect on the phase separation of glaze.When the content of B₂O₃ is 0.6mol,a large numberof fine phase separation droplets are produced in the glaze.Most of the droplets are 30-50 nm in size.Dozens of nano phase staggered peaks and valleys are formed on the glaze surface,improving the hydrophilic performance of the glaze surface.The minimum contact angle is 9.56°.The addition of B₂O₃ improved the glossiness of the glaze,and the highest glossiness was 102 under the condition of satisfying the comprehensive properties of the glaze.TiO₂ was introduced into the glaze to further optimize the glaze performance.The experimental results show that the addition of TiO₂ can promote the phase separation of the glaze,produce a dense convex rough structure in the glaze,and increase the hydrophilicity of the glaze.When the content of TiO₂ is 2.5 ? 5wt%,the contact angle is 7.33 ? 10.95°,which has a good hydrophilic effect;and the hardness value is 665.14 ? 761.57 kg/mm2,the whiteness value is 59.2 ? 76.17,which shows a good resistance to common pollutants?such as oleic acid,ink?and so on.Therefore,the self-cleaning glaze prepared in this paper is conducive to reducing the cost of cleaning,reducing environmental pollution,reducing the threat of dirt and detergent residues on human health,with good environmental protection and economic benefits,and provides a new idea for the preparation of self-cleaning materials.