Effect of Hollow Glass Beads on Properties of Two-Component Silicone Insulating Glass Sealant
The two-component silicone insulating glass sealant component A was prepared with α,ω-dihydroxy-polydimethi-cone(107 silicone rubber)as the base polymer,heavy calcium carbonate and nano-calcium carbonate as the reinforcing fillers,while component B was prepared with black paste,crosslinking agent,coupling agent and catalyst.The 107 silicone rubber,which accounted for 0%,0.5%,1.0%,1.5%and 2.0%of the mass of component A,was replaced by hollow glass beads with equal mass to prepare the sealant.The effects of the amount of hollow glass beads on the density,viscosity,extrusion rate and cost of component A were studied as well as its influence on the surface drying time,operation time,tensile strength,elongation at break and aging resistance of the two-component sealant.The results show that with the increase of the dosage of hollow glass beads from 0 to 2.0%,the density and extrusion rate of component A,the elongation at break of the sealant,the cost of compo-nent A per barrel decrease,the viscosity of component A increases,the surface drying time and breaking time of the sealant are shortened,and the tensile strength,thermal aging and water-ultraviolet aging properties of the sealant have no significant chan-ges.The optimal amount of glass micropheres is found to be 1.0wt%,under this condition,component A has the density of 1.652 g/cm3,the viscosity of 228 000 mPa·s,and the extrusion rate of 18 g/15 s.After mixing,the sealant has the surface dr-ying time of 47 min,and the pulling time of 75 min.The tensile strength of the cared sealant is 0.73 MPa,the elongation at break is 36.28%,and the cost component A of per unit volume is reduced by 0.5%.
two-componentinsulating glass sealanthollow glass beadslow density
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