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Method for preparing high fire resistance property expandable graphite

A technology of expanded graphite and high flame retardancy, applied in fire protection equipment and other directions, can solve the problems of unseen high flame retardancy expandable graphite, achieve high expansion volume, simple method, and improve the effect of adhesion

Inactive Publication Date: 2010-11-03
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chemical oxidation is currently the main method for preparing expandable graphite. Sulfuric acid, nitric acid, phosphoric acid, etc. are mostly used as intercalation agents. In recent years, in order to reduce the sulfur content of expanded graphite, the preparation of low-sulfur or sulfur-free expandable graphite has gained relatively Pay more attention, but there is no report on high flame retardant expandable graphite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of highly flame-retardant expandable graphite is to fully dissolve 0.8 gram of potassium dichromate in 20 milliliters of 98% concentrated sulfuric acid and 10 milliliters of nitric acid solution, then put 10 grams of 50 mesh flake graphite into the solution, and stir Evenly, after standing still for 0.5 hours, filter out the solution, fully wash with water; dry in an oven at 80 degrees for 6 hours; obtain ordinary expandable graphite products. In a 900-degree muffle furnace, a ceramic crucible is used for puffing, and the measured expansion volume is 200 ml / g.

Embodiment 2

[0023] The preparation method of the highly flame-retardant expandable graphite described in embodiment 1, 0.8 gram potassium dichromate is fully dissolved in the 98% vitriol oil of 30 milliliters, makes solution A; 5 gram ammonium polyphosphate and 0.2 Dissolve one gram of potassium dichromate fully in 30 milliliters of phosphoric acid to prepare solution B; then put 10 grams of 50-mesh flake graphite into solution A, stir evenly, and after standing still for 0.5 hours, filter out the solution and put the product into In solution B, stir evenly, and after standing still for 6 hours, filter out the solution and fully wash with water; dry in an oven at 80 degrees for 6 hours; obtain a highly flame-retardant expandable graphite product. In a 900-degree muffle furnace, a ceramic crucible is used for puffing, and the measured expansion volume is 200 ml / g.

Embodiment 3

[0025] The preparation method of the high flame-retardant expandable graphite described in embodiment 1, 0.5 gram potassium dichromate is fully dissolved in the 98% vitriol oil of 20 milliliters and the nitric acid solution of 10 milliliters, makes solution A; Ammonium polyphosphate and 0.3 g of potassium dichromate were fully dissolved in 30 ml of phosphoric acid to prepare solution B; then 10 g of 50-mesh flake graphite was put into solution A, stirred evenly, and after standing still for 0.5 hours, filtered out Solution, put the product into solution B again, stir evenly, and after standing still for 6 hours, filter out the solution, and fully wash with water; dry in an oven at 80 degrees for 6 hours; obtain a highly flame-retardant expandable graphite product. In a 900-degree muffle furnace, a ceramic crucible is used for puffing, and the measured expansion volume is 280 ml / g.

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Abstract

This invention discloses a method for preparing swelled graphite as high fire retardant. Recently, chemical oxidation method is the main method for producing the same, with the lamination-inserting agent, selected from: sulfuric acid, nitric acid or phosphoric acid. Lately, people pay more attention to swelled graphite with low sulphur or sulphur-free. In the inventive method, mixture solution ofsulfuric acid and nitric acid or concentrated sulfuric acid is used, and used is oxidized natural graphite containing solid strong oxidant with its content of 0.5-50% of the mass of the graphite. Thereaction temperature is 0-60deg.C, reaction time is 10-240 min, so obtained is primary product. It is then reacted in phosphoric acid solution containing poly-ammonium-phosphate as lamination-inserting agent, reacting at temperature of 0-60deg.C for 0.5-24hrs., so obtaining the inventive product. Said product can be used as fire retardant used in wide fields such as plastics, coatings and plasticfoam.

Description

Technical field: [0001] The invention relates to a preparation of graphite material, in particular to a preparation method of highly flame-retardant expandable graphite. Background technique: [0002] Due to the interaction between the carbon atomic layer and the intercalation layer atoms, the expandable graphite has a series of new properties, especially when the expandable graphite is subjected to high temperature, it shows a volume expansion of hundreds of times, which makes it suitable for fire. When the flame is suffocated by the instantaneous increase in volume, the purpose of flame retardancy and fire prevention is achieved. Expandable graphite with sulfuric acid as an intercalation agent is a commercial product widely used at present. The flame-retardant polymer material has the advantages of non-toxicity, low smoke, low burning rate, and low heat release rate when burning. The development trend of combustible materials has gained wide attention. [0003] Expandabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C09K21/02A62D1/00
Inventor 韩志东董丽敏张显友吴泽张达威
Owner HARBIN UNIV OF SCI & TECH
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