초록 ▼

A novel method is presented for converting plywood, wall panelling, and laminated sheathing (doorskin, resin-impregnated paper generally termed “Mica”, and other combinations of laminated wood and/or wood plastic products) used in construction, into a fire barrier which not only decreases the spread

A novel method is presented for converting plywood, wall panelling, and laminated sheathing (doorskin, resin-impregnated paper generally termed “Mica”, and other combinations of laminated wood and/or wood plastic products) used in construction, into a fire barrier which not only decreases the spread of flame along the surface, but prevents the penetration of flame into the interior of the product and through to the opposite side, and thus enables these products to function as a “fire-barrier”under ordinary fire conditions normally associated with home, apartment, commercial, industrial, ship/boat and aircraft fires. The method consists of substituting a non-combustible, high temperature-resistant coating, which in itself has adequate adhesive properties to substitute for the presently used adhesives in the laminated wood and wood/plastic structures, for one or more of the adhesive layers, herein termed the internal or “submerged”coatings. The coating may be used alone, or in the form of an impregnated sheet of woven or non-woven fabric made from fiberglass, carbon, aramid (“Kevlar”), quartz, polyester, nylon, or other natural or synthetic or inorganic fibers. The impregnated fabric adds tensile strength and flexural modulus to the laminate and may be used as the bonding agent (adhesive) alone or in combination with the currently used adhesives (e.g. phenol-formaldehyde, urea formaldehyde, resorcinol, melamine, melamine urea, urea, etc.). The cited examples consist of a synergistic combination of two and three non-combustible inorganic bonding systems: viz. magnesium “oxychloride”or magnesium “oxysulphate”cements, along with high alumina calcium aluminate cement; and with or without colloidal silica. These non-combustible formulations are compatible with some of the currently used plywood phenolic, urea and resorcinol adhesives, and may be mixed together so that only one application and curing cycle is required and still imparts the fire-barrier properties inherent in the coating and coating laminate.

대표청구항 ▼

A fire resistant laminate for retarding flame spread and flame penetration therethrough, said laminate comprising: (A) a solid, combustible lamina; and (B) bonded to said lamina (A), a hard, thin, continuous layer up to about 1/16 inch thick comprising an inorganic cementitious composition; wherein

A fire resistant laminate for retarding flame spread and flame penetration therethrough, said laminate comprising: (A) a solid, combustible lamina; and (B) bonded to said lamina (A), a hard, thin, continuous layer up to about 1/16 inch thick comprising an inorganic cementitious composition; wherein said layer (B) is capable of maintaining its structural strength and dimensional stability with zero flame spread when exposed to a flame temperature of 2000°F. for a time period of 1 hour; and wherein said inorganic cementitious composition in a fluid state is capable of adhesively bonding to lamina (A) and maintaining an adhesive bond after drying to form said thin layer; and wherein said inorganic cementitious composition consists essentially of (1) a binder component comprising (a) 65% by weight magnesium oxide containing 98% MgO; (b) 16.3% by weight high alumina calcium aluminate cement containing 80% Al2O3 and 18% CaO; (c) 16.3% by weight silica flour; and (d) 2.4% by weight titanium dioxide; and (2) an activator comprising a magnesium chloride solution (30°Baum); wherein the activator is in an amount of 141 parts by weight per 100 parts by weight magnesium oxide; and wherein said binder component is caused to set at a temperature up to about 120°F. within about 45 minutes by said activator; said laminate having a Class I (or A) fire retardancy classification.