NOVELTY - Hydroxy-group-containing scavenging agent, prepared by (i) completely drying amino silane coupling agent under nitrogen atmosphere by adding into a reactor, heating at 40-60 degrees C, initiating stirring process, slowly adding diisocyanate compound dropwise into the reactor for 0.5 hours, and controlling the entire reaction process at 60 degrees C, stirring for 0.5-1 hour after dropwise addition of diisocyanate compound to complete the reaction, where the degree of vacuum of reaction solution, is not less than -0.095 Mpa, and distilling at 80-100 degrees C for 0.5-1 hour, and removing free alcohol produced, is claimed.    USE - The scavenging agent is useful in the preparation of long storage capacity dealcoholized sealing glue (claimed), and various substrates of solar photovoltaic modules, an aluminum frame, a back plate and a junction box.    ADVANTAGE - The scavenging agent exhibits dual function of removing hydroxy group, and increasing adhesive force when utilized in the product, and prolongs the storage stable period of sealing glue by at least 12 months.    DETAILED DESCRIPTION - Hydroxy-group-containing scavenging agent, prepared by completely drying amino silane coupling agent under nitrogen atmosphere by adding into a reactor, heating at 40-60 degrees C, initiating stirring process, slowly adding diisocyanate compound dropwise into the reactor for 0.5 hours, where the molar ratio of amino silane coupling agent and diisocyanate compound added accounts to 1:1-2, and controlling the entire reaction process at 60 degrees C, stirring for 0.5-1 hour after dropwise addition of diisocyanate compound to complete the reaction, where the degree of vacuum of reaction solution, is not less than -0.095 Mpa, and distilling at 80-100 degrees C for 0.5-1 hour, and removing free alcohol produced, is claimed. INDEPENDENT CLAIMS are also included for:    (1) long storage capacity dealcoholized sealing glue comprising (a) 100 pts. wt. methyldiethoxysiloxy ((CH3(CH3O)2SiO)1/2) terminated polydimethylsiloxane, (b) 5-15 pts. wt. methyl silicone oil, (c) 80-130 pts. wt. nano-calcium carbonate, (d) 1-10 pts. wt. cross-linking agent, 1-3 pts. wt. hydroxy-group-containing scavenging agent, and (e) 1-5 pts. wt. titanium chelate; and    (2) preparing sealing glue, comprising adding components (a), (b) and (c) into a double-planetary stirring kettle, stirring at 90-110 degrees C for 2-4 hours under vacuum conditions of -0.09MPa to 0.1 MPa, cooling below 55 degrees C, and uniformly stirring by adding the remaining raw materials, to obtain the product.