Environment-friendly complex adhesive

Abstract

The invention relates to an environment-friendly complex adhesive, in particular to adhesive or thermosetting adhesive cement for door core or building decoration adhesion and production and processing of composites, and aims to provide an environment-friendly adhesive which can be applied to steel antitheft doors and fireproof doors, is cured more quickly at normal temperature and is lower in cost. The complex adhesive is characterized by comprising components in percentage by weight as follows: a material A containing 30%-70% of sodium silicate or sodium silicate and silica sol, 15%-48% of an organic synergist and 0-55% of an additive; a material B containing polyisocyanate, 8%-20% of -NCO groups, larger than 30% of polyurethane prepolymer and 0-30% of a synergist, wherein the polyurethane prepolymer is polystyrene foam which is adhesive for existing fireproof door and antitheft door core materials and door sheets, the polystyrene foam is mainly formed by reacting polyester polyol orpolyether polyol with polyisocyanate, and the content of -NCO groups is 3%-5%; and the weight ratio of the material A to the material B is (0.5-1):(0.5-1).

Description

technical field [0001] The invention relates to an adhesive glue, especially an adhesive or a thermosetting glue that can be used for bonding and strengthening fireproof doors and anti-theft door cores, as well as bonding and processing construction and decoration materials. Background technique [0002] Most of the bonding glue between the core material and the door panel of the existing fire doors and anti-theft doors is polyurethane foam, and its bonding strength is required to be not less than 0.5MPa. It is mainly polyester polyol or polyether polyol reacted with polyisocyanate. The formed polyurethane prepolymer containing residual -NCO groups is usually added with an appropriate amount of catalyst, stabilizer and 10-50% organic solvent. Generally, the content of -NCO groups is about 2%-6%, and it has relatively high toughness. Good, high bonding strength and easy to use, but the price is high; prepolymers and solvents are flammable, and burning produces thick black smo...

AI Technical Summary

Problems solved by technology

Since the physical and chemical properties of inorganic water-soluble substances, especially water glass and silica sol, are quite different from various organic glues, if they are improperly selected or mixed, they will solidify immediately or thicken and then solidify in a short period of time, and the solidified body is easily broken and pulverized. The mixed rubber has weak adhesion and poor strength

Hydroxyl and silanic hydroxyl groups in water glass can react with styrofoam containing terminal NCO, but the glued product is brittle and has poor strength and has no practical bonding strength.