Liquid flame retardant composition
AssigneeCsir
InventorStephen Anthony Chapple
Life of this patent
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Abstract
A liquid flame retardant composition is in the form of an admixture which includes a phosphate-based flame retardant, ammonium hydroxide and zinc borate. The invention extends to a method of providing a phosphate-based liquid flame retardant composition, to the use of a phosphate-based flame retardant, ammonium hydroxide and a zinc borate in the manufacture of a liquid flame retardant composition, to a cellulosic material treated with the liquid flame retardant composition and to a method of inhibiting strength loss in a cellulosic material when the cellulosic material is exposed to heat.
Claims19
A method of inhibiting strength loss in a cellulosic material which is in the form of a textile or cloth and that forms part of a composite material, when the cellulosic material is exposed to heat, the method comprising
- treating the cellulosic material, prior to incorporation of the cellulosic material in the composition material, with an aqueous liquid flame retardant composition, wherein the aqueous liquid flame retardant composition comprises a non-durable or semi-durable phosphate-based flame retardant, ammonium hydroxide and a zinc borate, to provide the cellulosic material with non-durable flame retardancy,
- wherein the treated cellulosic material after exposure to a heat profile of 100° C. for 90 minutes and then 160° C. for 120 minutes shows a tensile strength, determined in accordance with ISO 13934-1:1999 Textiles—Tensile properties of fabrics—Part 1:
- Determination of maximum force and elongation at maximum force using the strip method, at least 1.2 times higher than the tensile strength of cellulosic material treated with just the phosphate-based flame retardant, after exposure to the same heat profile.
A method of inhibiting strength loss in a cellulosic material, selected from the group consisting of flax, cotton, hemp fibres, kenaf fibres and bamboo fibres, which is in the form of a textile or cloth and that forms part of a composite material, when the cellulosic material is exposed to heat, the method comprising
- treating the cellulosic material, prior to incorporation of the cellulosic material in the composite material, with an aqueous liquid flame retardant composition, wherein the aqueous liquid flame retardant composition comprises a non-durable or semi-durable phosphate-based flame retardant, ammonium hydroxide and a zinc borate, to provide the cellulosic material with non-durable flame retardancy,
- wherein the non-durable or semi-durable phosphate-based flame retardant comprises or is diammonium phosphate, a mixture of diammonium phosphate and urea, an organic phosphorous-nitrogen phosphate compound, a mixture of organic and inorganic phosphorous and nitrogen compounds of which at least one is a phosphate, or a nitrogen-containing phosphoric acid salt, or any mixtures of two or more of the foregoing,
- wherein the aqueous liquid flame retardant composition comprises between 5% and 50% by mass of the phosphate-based flame retardant, on a solids basis,
- wherein the aqueous liquid flame retardant composition comprises between 5% and 30% by mass of the ammonium hydroxide,
- wherein the aqueous liquid flame retardant composition comprises between 1% and 25% by mass of the zinc borate, and
- wherein the treated cellulosic material after exposure to a heat profile of 100° C. for 90 minutes and then 160° C. for 120 minutes shows a tensile strength, determined in accordance with ISO 13934-1:1999 Textiles—Tensile properties of fabrics—Part 1:
- Determination of maximum force and elongation at maximum force using the strip method, at least 1.2 times higher than the tensile strength of cellulosic material treated with just the phosphate-based flame retardant, after exposure to the same heat profile.
Dependencies are inferred from the claim text.