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Fire resistant cellulosic materials

a cellulosic material and fire-resistant technology, applied in the field of treated cellulosic materials, can solve the problems of fire jumping from house roof to house roof, restrictions on wood use in roofing, etc., and achieve the effect of improving fire-resistant and leach-resistant properties

Inactive Publication Date: 2001-12-27
ASTARIS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] It an object of the invention to provide a treated cellulosic material which has improved fire-resistant and leach-resistant properties.
[0013] It is a further object of the invention to provide a process for preparing a wood shingle and plywood compositions having improved fire-resistant and leach-resistant properties.
[0014] It is another object of this invention to provide an aluminum iron phosphate composition which renders wood fire resistant and leach resistant.

Problems solved by technology

Wood, a natural cellulose material, is used in home construction in roofing, frames, support and plywood; however, wood has use restrictions in roofing as there is no approved commercial fire resistant treatment.
If homes were not protected with nonflammable roofs, a fire could easily jump from house roof to house roof, especially with high winds.
At the same time, some organic fire retardants may produce fairly toxic gases during exposure of the treated material to fire temperatures which may present problems for persons caught inside a burning building and for fire fighters.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0046] Example 1 illustrates a first embodiment of this invention

[0047] Wood having an unfinished surface and illustrative of a preferred cellulosic material was soaked in a solution containing aluminum phosphate having an Al.sub.2O.sub.3--P.sub.2O.sub.5 ratio of about 0.33+ / -0.1. The aluminum phosphate solution was heated to a temperature of about 100.degree. C. and the wood was placed in the aluminum phosphate solution of about 10% solids by weight of the total solution for about 20 minutes. A single contact of the phosphate solution was made with the wood. This initially treated wood was removed from the aluminum phosphate solution and allowed to air dry until the surface was dry to the human touch for about one hour, thus, providing an air-dried sample of wood. The air-dried sample of wood was then placed in a microwave oven, which was turned on high power, and irradiated for about 20 seconds to drive out initial water of composition without burning the treated wood and to effec...

example 2

[0048] Example 2 is illustrates a second embodiment of this invention

[0049] Part A: Preparation of Aluminum Phosphate Solution

[0050] Aluminum phosphate solutions were prepared starting with the ratio of Al to P corresponding to chain length of n=100 (Al.sub.2O.sub.3--P.sub-.2O.sub.5 ratio is 1:2.94) with some exceptions for chain length 20 (Al.sub.2O.sub.3--P.sub.2O.sub.5 ratio is 1:2.72). Several metal oxides were added to a hot or boiling aqueous solution of phosphoric acid in such amount to obtain aluminum metal condensed phosphates with chain length n=20. The amounts of metal oxides employed in the phosphate solution were limited by their different solubilities in the phosphate solution. A single solution containing aluminum phosphate was employed in this Example.

[0051] Several samples were made for preliminary testing of metal oxides: ferric / ferrous oxide (3.06% in respect to solid); ferric oxide (2.5%); cupric oxide (1.3%); and zinc oxide (1.23% of mixture 3 parts of zinc oxid...

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Abstract

A process for preparing a fire-resistant cellulosic material which comprises contacting cellulosic material with an aqueous solution of aluminum phosphate wherein the molar ratio of aluminum to phosphorous is less than 1:1, optionally containing a metal oxide, to form an initially treated cellulosic material containing aluminum phosphate and an increased amount of water, removing water from and curing said initially treated cellulosic material to form a fire-resistant cellulosic material. The cellulosic material is preferably wood and the wood is preferably a shingle or plywood.

Description

[0001] This invention relates to a process for fire resistant cellulosic materials and rendering cellulosic materials leach resistant. More particularly, the invention relates to a process of using aluminum phosphate to make wood fire resistant and render such wood leach resistant. This invention relates also to a composition comprising cellulosic materials and aluminum phosphate which is fire resistant.[0002] Wood, a natural cellulose material, is used in home construction in roofing, frames, support and plywood; however, wood has use restrictions in roofing as there is no approved commercial fire resistant treatment. If homes were not protected with nonflammable roofs, a fire could easily jump from house roof to house roof, especially with high winds.[0003] Effective fire resistant treatment of wood for both exterior and interior uses under conditions of leaching and weathering is needed because desirable properties of wood must be preserved after initial fire resistant treatment....

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B27K3/15B27K3/26
CPCB27K3/153B27K3/26B27K2240/30Y10T428/31971Y10T428/31996Y10T428/31986Y10T428/31989Y10T428/31993
Inventor ARSHINOVA, ROSE P.GRIFFITH, EDWARD J.
Owner ASTARIS LLC