▎ 摘　　要

NOVELTY - A methyl methacrylate resin-based fast-diameter sealing material composition comprises 5-20 pts. wt. acrylonitrile-methyl methacrylate-vinylidene chloride copolymer, 1-10 pts. wt. cellulose nanofibers, 1-10 pts. wt. butyl acrylate, 0.1-5 pts. wt. (2-phenylethyl)2-cyanoacrylate, 0.1-5 pts. wt. 2-pentenoic acid, 0.1-5 pts. wt. sulfide-based silane coupling agent, 0.1-5 pts. wt. furocoumarin compound (I), 1-10 pts. wt. benzoyl peroxide (BPO) curing agent, and 5-20 pts. wt. inorganic filler based on 100 pts. wt. of the methyl methacrylate resin. USE - Methyl methacrylate resin-based fast-diameter sealing material composition used for repairing cracks in concrete structure (claimed). ADVANTAGE - The methyl methacrylate resin-based fast-diameter sealing material composition has high penetrability, and provides excellent filling properties, adhesive strength, elongation, heat resistance, cold resistance, weather resistance and fast hardening properties, and prevent cracks caused by repeated contraction and expansion due to changes in ambient temperature or cracks deteriorated due to environmental factors or aging over time. DETAILED DESCRIPTION - A methyl methacrylate resin-based fast-diameter sealing material composition comprises 5-20 pts. wt. acrylonitrile-methyl methacrylate-vinylidene chloride copolymer, 1-10 pts. wt. cellulose nanofibers, 1-10 pts. wt. butyl acrylate, 0.1-5 pts. wt. (2-phenylethyl) 2-cyanoacrylate, 0.1-5 pts. wt. 2-pentenoic acid, 0.1-5 pts. wt. sulfide-based silane coupling agent, 0.1-5 pts. wt. furocoumarin compound of formula (I), 1-10 pts. wt. benzoyl peroxide (BPO) curing agent, and 5-20 pts. wt. inorganic filler based on 100 pts. wt. of the methyl methacrylate resin. An INDEPENDENT CLAIM is included for crack repairing of a concrete structure, which involves using the methyl methacrylate resin-based fast-diameter sealing material composition.