초록 ▼

A flame retardant thermal insulation material comprising a dry, shredded cellulosic material, such as newsprint, which is coated with a dry phosphorous-containing, flame retardant composition. The composition is one which is capable of decomposing near the ignition temperature of the shredded paper,

A flame retardant thermal insulation material comprising a dry, shredded cellulosic material, such as newsprint, which is coated with a dry phosphorous-containing, flame retardant composition. The composition is one which is capable of decomposing near the ignition temperature of the shredded paper, which is between 120 degrees and Celsius and 250 degrees Celsius and preferably includes a plurality of compounds which decompose at different temperatures spaced within this range to provide the stagewise release of combustion inhibiting agents. The composition can be a single compound such as calcium phosphate but preferably is a combination of similar compounds such as (NH4)2HPO4, CaH4(PO4)2, CaHPO4 and triple super phosphate. Further, the phosphorous composition is preferably combined with urea. Elemental sulfur powder may be included with any of the previous compositions as a smoke retardant. The paper and flame retardant composition are maintained in the dry solid state during processing, application and use. The insulation is manufactured by shredding the paper and thoroughly mixing it with the finely ground, powdered flame retardant composition to intimately coat the paper with the flame retardant powder. The shredded, coated paper may be bagged for later use as poured or blown in insulation or it may be filled into elongated plastic envelopes to form insulative batting. Air may be evacuated from the bags or envelopes.

대표청구항 ▼

A method for preparing and packaging flame retardant thermal insulation comprising: (a) shredding dry paper; (b) feeding said dry paper into a hammer mill shredder; (c) depositing the shredded output of the hammer mill into a mixing bin; (d) mixing a dry, powdered, phosphorous-containing composition

A method for preparing and packaging flame retardant thermal insulation comprising: (a) shredding dry paper; (b) feeding said dry paper into a hammer mill shredder; (c) depositing the shredded output of the hammer mill into a mixing bin; (d) mixing a dry, powdered, phosphorous-containing composition selected from the group consisting of phosphates and phosphites which decomposes in a temperature range of 120°C. to 250°C. to evolve phosphoric acid with said shreaded paper to effect the coating of said paper with said powder; (e) blowing said dry, powdered phosphorous-containing composition into said mixing bin to effect the intimate coating of the surface of said shredded paper with said composition; (f) transferring said coated shredded paper through an auger device to effect the enveloping of said coated shredded paper wherein the envelope used is an elongated plastic envelope and is capable of holding a vacuum; (g) drawing a vacuum on said plastic envelope to effect compression of said insulation material; and (h) sealing said envelope while said envelope is under vacuum. A flame retardant, thermal insulation material comprising: (a) dry, shredded, cellulosic material; and (b) a substantially dry, powdered, flame retardant composition which includes a plurality of compounds which are phosphorous containing compounds selected from the group consisting of phosphates and phosphites which decompose at a plurality of different temperatures spaced within a temperature range of substantially 120°Celsius to 250°C. to evolve phosphoric acid and other agents which retard the exothermic oxidation of said cellulosic material and decomposition products thereof, said composition being distributed on the surface of said shredded material. A flame retardant for a dry, shredded, cellulosic, thermal insulation material, said retardant comprising a substantially dry, powdered, phosphorous-containing, flame retardant composition which decomposes to evolve phosphoric acid substantially at the temperatures at which the insulation material has sufficient thermal feedback to sustain its rapid oxidation wherein said composition comprises calcium phosphate or dry powered triple super phosphate or both and at least one other flame retardant compound which decomposes at a temperature different from said phosphate.