| 摘要 |
Two-component polyurethane composition comprises a polyol component comprising at least one reaction product of castor oil and ketone resins with an hydroxy number of 110-200 mg potassium hydroxide/g, and at least one aliphatic triol; and a polyisocyanate component comprising at least one aromatic polyisocyanate. The ratio of all isocyanate groups of the aromatic polyisocyanates to all the hydroxy groups of ketone resins and aliphatic triol is 1.15:1-85:1. The aliphatic triol is 1,2,3-propane triol, 1,1,1-trimethylol propane and/or polyether polyols. Two-component polyurethane composition comprises: a polyol component comprising at least one reaction product of castor oil and ketone resins with an hydroxy number of 110-200 mg potassium hydroxide/g, and at least one aliphatic triol; and a polyisocyanate component comprising at least one aromatic polyisocyanate. The ratio of ketone resins and aliphatic triol is 4-50 wt.%. The ratio of all isocyanate groups of the aromatic polyisocyanates to all the hydroxy groups of ketone resins and aliphatic triol is 1.15:1-85:1. The aliphatic triol is 1,2,3-propane triol, 1,1,1-trimethylol propane and/or polyether polyols based on 1,1,1-trimethylol propane with a molecular weight of 170-500 g/mole and an hydroxy-number of 400-1100 mg potassium hydroxide/g. The sum of all the hydroxy groups of ketone resins and aliphatic triol is >= 90% of the total of all the hydroxy groups of the two-component polyurethane composition. Independent claims are also included for: (1) adhesive bonding comprising mixing the polyol component and the polyisocyanate component of the two-component polyurethane composition, applying the mixed polyurethane composition to at least one of the substrate surfaces to be bonded, joining within the open time and curing the polyurethane composition; and (2) non-positive sealing of joints and columns in a substrate comprising mixing the polyol component and the polyisocyanate component of a two-component polyurethane composition, applying the mixed polyurethane composition in a joint to be bridged between the two substrates, or in a gap to be filled on the surface of a substrate, and curing the polyurethane composition in the joint or in the gap; (3) adhesively bonded article which has is bonded by adhesive bonding method; and (4) partly filled articles, which is filled by non-positive sealing. |
