news on november 25, 2023, according to the announcement of the state intellectual property office, beijing gaomeng new materials co., ltd. applied for a project called "a vegetable oil-based flame retardant two-component polyurethane adhesive and its preparation method", publication no. cn117106406a, application date is august 2023.
the patent abstract shows that the invention relates to a vegetable oil-based flame retardant two-component polyurethane adhesive and its preparation method. first, the vegetable oil polyol is reacted with isocyanate to prepare a hydroxyl-terminated polyurethane prepolymer; secondly, a silane coupling agent is used at a certain temperature and rotation speed. the linking agent is used to dry-modify fillers and flame retardants. then, the prepared hydroxyl-terminated prepolymer, modified filler and modified flame retardant are mixed with a flame retardant, chain extender, cross-linking agent, catalyst, etc. to prepare component a; component b is the isocyanate component. mix component a and component b uniformly in a ratio of 3 to 5:1 to obtain a flame-retardant polyurethane adhesive. the adhesive has a wide range of bonding base materials, including smc, metal, pvc, etc., and has excellent bonding performance. the aluminum sheet/aluminum sheet bonding strength reaches more than 15mpa, and the adhesive has excellent flame retardant properties, with a limiting oxygen index of up to more than 30, after igniting for 10 seconds, it will be extinguished within 5 seconds of leaving the fire, and no molten droplets will be generated. the flame retardant grade reaches ul94 v0 level.
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