Spectral selectivity nano heat-insulating PVB (polyvinyl butyral) film and preparation method thereof

The invention relates to the technical field of heat-insulating energy-saving materials, in particular to a spectral selectivity nano heat-insulating PVB (polyvinyl butyral) film and a preparation method thereof. The preparation method includes that through synergistic effect of near infrared long-wave barrier nano material dispersion liquid, near infrared short-wave barrier nano material dispersion liquid and infrared reflection nano material dispersion liquid, the PVB film integrates spectral selectivity absorption and spectral selectivity reflection, so that high transmittance of visible light is guaranteed, near infrared rays can be well absorbed and reflected, the problem of remarkable lowering of heat-insulating effect of a ceramic heat-insulating film due to the fact that heat absorbed by the ceramic heat-insulating film reaches a saturation value is solved effectively, and the problems of quick aging and interlayer glass delaminating of the PVB film caused by overhigh temperature are solved.Proper amo