Preparation And Performance Research Of Nanocomposite Thermal Insulation PVB Interlayer Film

With the consumption of energy transition,energy-saving and environmentally friendly materials have gradually attracted the attention of researchers at home and abroad.Safety glass usually uses polyvinyl butyral（PVB）resin as an interlayer,which is widely used in construction and automotive fields because of its excellent optical,mechanical and impact properties.The expansion of application areas poses certain challenges for safety glass in terms of thermal insulation.Therefore,how to prepare a safety glass interlayer with high transparency and good thermal insulation performance will become the focus of this article.In this paper,nano-copper sulfide with different morphologies was prepared by hydrothermal method by selecting different sulfur sources and copper sources.Subsequently,nano-copper sulfide and PVB resin were prepared into safety glass interlayers by blending and melt extrusion,and the feasibility of nano-copper sulfide as a functional material in transparent heat-insulating glass interlayers was studied.The main research contents of this paper are as follows:（1）Triethylene glycol（ethylene glycol）diisooctanoate（3GO）was selected as plasticizer,and the experimental results showed that when the dosage of 3GO was 27phr,the blend had a maximum tensile strength of 19.90MPa,and the glass transition temperature was reduced from 72.85℃to 27.61℃,and the dosage of 27phr was used as the basic formula.Subsequently,ATO nanoparticles were added as variables to prepare PVB/3GO/ATO nanoparticle blends,and when the ATO nanoparticles content was 0.3%,the maximum tensile strength of the blend was 26.86MPa,which was about 35%higher than that of the basic formula.TG tests show that ATO nanoparticles can improve the T₅and T₂₀of the blended system and increase their thermal stability.Through ultraviolet-visible-infrared light spectrum and thermal conductivity test analysis,the results show that the visible light transmittance of the laminated glass can reach 85%;When the content is 0.9%,the transmittance of infrared light is only 55.5%,and the thermal conductivity of the blend film is reduced to 0.205W/（m·K）.It shows that the modified glass interlayer has a certain thermal insulation ability.（2）Sodium sulfide（Na S）and copper chloride dihydrate（Cu Cl₂·2H₂O）were selected as sulfur and copper sources,respectively,and sheet nano-CuS was synthesized by hydrothermal method.Through EDS,XRD and TEM analysis,the prepared sample composition elements were mainly sulfur and copper,the crystal phase was cubic phase,and the structure was sheet.Through ultraviolet-visible light spectroscopy,the band gap of sheet nano-CuS was 1.75e V,and the transmittance of PVB/3GO/sheet nano-CuS blend interlayer laminated glass to visible light could reach 81.6%.The thermal insulation performance of the adhesive film was analyzed by ultraviolet-visible-infrared light spectroscopy and thermal conductivity tester,and when the content was 0.1%,the transmittance of infrared light was only 57.5%,and the thermal conductivity of the blended film was reduced to 0.209W/（m·K）.（3）Cu（NO₃）₂and thiourea were selected as copper and sulfur sources,respectively,and porous hollow nano-CuS were synthesized by hydrothermal template method.Through EDS,XRD,TEM tests,the main elements of the sample are sulfur and copper,the crystal phase is a tetragonal phase,and the structure is porous hollow spherical.When the porous hollow nano-CuS content was 0.04%,the tensile strength of the blended system reached a maximum of 22.74MPa,and when the content was 0.02%,the glass transition temperature was the lowest,29.25℃.Through UV-Vis spectroscopy,the band gap of porous hollow CuS was 1.9e V,and the prepared PVB/3GO/porous hollow CuS blend interlayer safety glass had a transmittance of up to 82.7%for visible light.The thermal insulation performance of the film was analyzed by ultraviolet-visible-infrared light spectroscopy and thermal conductivity test,and when the content was 0.1%,the transmittance of infrared light was only 53.8%,and the thermal conductivity of the blended film was reduced to0.191W（m·K）.