Abstract: A low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings is provided by including a composition A and a composition B, wherein the composition A includes silane-modified polyether, plasticizer, hydroxy-terminated branched polyether, branched polyether epoxy resin, coupling agent, thixotropic agent, silica, reinforcing filler A, hollow glass microspheres and toner, and the composition B includes plasticizer, hydroxy-terminated branched polyether, light stabilizer, reinforcing filler B, organotin catalyst and amine curing agent. The present disclosure also optimized the various ingredients in the silane-modified polyether sealant, and a formulation of sealant having the best bonding effect was obtained.

Abstract: A low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings is provided by including a composition A and a composition B, wherein the composition A includes silane-modified polyether, plasticizer, hydroxy-terminated branched polyether, branched polyether epoxy resin, coupling agent, thixotropic agent, silica, reinforcing filler A, hollow glass microspheres and toner, and the composition B includes plasticizer, hydroxy-terminated branched polyether, light stabilizer, reinforcing filler B, organotin catalyst and amine curing agent. The present disclosure also optimized the various ingredients in the silane-modified polyether sealant, and a formulation of sealant having the best bonding effect was obtained.

Abstract: The present invention discloses a micro gradient filter material of high-efficiency low-resistance micron-nano fibers and a preparation method therefor. The material comprises a nano fine filter layer, a micron support primary filter layer, and a protective surface layer; the micron support primary filter layer and the nano fine filter layer are alternately superimposed, and arranged between the two protective surface layers; the nano fine filter layer has a grid structure composed of a plane matrix fiber layer and cones, wherein the fibers between the point of the cone and the grid matrix fiber layer form a structure oriented from the point to the plane matrix fiber layer. In the present invention, the uncharged filter material of has a filtration efficiency of 99.9% to 99.999% and a pressure drop of 130-300 Pa for the NaCl aerosol with a mass median diameter of 0.26 ?m, and the uncharged filter material has a filtration efficiency of 99.9% to 99.