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Preparation method of smokeless expandable graphite flame retardant

A technology of expanded graphite and flame retardant, which is applied in the field of flame retardant, can solve the problem of damage and shedding of the expanded carbon layer, achieve the effects of reduced smoke and dust, simple chemical structure, and no secondary pollution

Inactive Publication Date: 2019-10-11
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this flame retardant cannot effectively solve the problem that the expanded carbon layer produced by the expandable graphite under the action of flame pressure or heat convection is destroyed and falls off during use, thereby generating smoke and dust.

Method used

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  • Preparation method of smokeless expandable graphite flame retardant
  • Preparation method of smokeless expandable graphite flame retardant
  • Preparation method of smokeless expandable graphite flame retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add magnesium nitrate hexahydrate and aluminum nitrate nonahydrate into a 100mL beaker at a molar ratio of 3:1, add 50mL deionized water to fully dissolve to obtain solution S1; mix 2g of expandable graphite with a particle size of 50-150μm into solution S1 , mix evenly, adjust the pH value to 10 with sodium hydroxide solution, and stir well to obtain a mixed solution S2, wherein the mass ratio of expandable graphite to the coating material is 1:1; transfer the mixed solution S2 to 100mL polytetrafluoroethylene In an ethylene-lined autoclave, heat at 100°C for 12 hours by hydrothermal method, and cool to room temperature; the product obtained is centrifugally filtered with a centrifuge, washed with deionized water until the pH of the filtrate is neutral, and washed with ethanol The product was then dried at a temperature of 90 °C and cooled to room temperature to prepare a smokeless expandable graphite flame retardant (LDG@EG).

[0026] SEM images of expandable graphite...

Embodiment 2

[0029] Add magnesium nitrate hexahydrate and aluminum nitrate nonahydrate into a 100mL beaker at a molar ratio of 2:1, add 50mL deionized water to fully dissolve to obtain solution S1; mix 2g of expandable graphite with a particle size of 50-150μm into solution S1 , mix well, adjust the pH to 11 with sodium hydroxide solution, and stir well to obtain a mixed solution S2, wherein the mass ratio of expandable graphite to the coating material is 2:1; transfer the mixed solution S2 to 100mL polytetrafluoroethylene In a lined high-pressure reactor, heat preservation at 120°C for 18 hours by hydrothermal method, cool to room temperature; centrifuge filter to obtain the product; wash the product with deionized water until the pH value of the filtrate is neutral, wash with ethanol, and then in Dry at a temperature of 60°C and cool to room temperature to prepare a smokeless expandable graphite flame retardant.

[0030] According to the mass ratio of 1:3, the smokeless expandable graphi...

Embodiment 3

[0032] Add magnesium nitrate hexahydrate and aluminum nitrate nonahydrate into a 100mL beaker at a molar ratio of 4:1, add 50mL deionized water to fully dissolve to obtain solution S1; mix 2g of expandable graphite with a particle size of 50-150μm into solution S1 , mix evenly, adjust the pH to 10.5 with sodium hydroxide solution, and stir well to obtain a mixed solution S2, wherein the mass ratio of expandable graphite to the coating material (magnesium nitrate and aluminum nitrate) is 3:1; the mixed solution S2 Transfer to a 100mL polytetrafluoroethylene-lined autoclave, heat it at 80°C for 24 hours by hydrothermal method, cool to room temperature, and centrifugally filter to obtain the product; wash the product with deionized water until the pH value of the filtrate is neutral properties, washed with ethanol, dried at a temperature of 75°C, and cooled to room temperature to obtain a smokeless expandable graphite flame retardant.

[0033] According to the mass ratio of 1:3, ...

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Abstract

The invention discloses a preparation method of a smokeless expandable graphite flame retardant. The method comprises the steps of completely dissolving a magnesium salt and an aluminum salt in deionized water to obtain a solution S1; adding expandable graphite for uniform mixing to obtain a mixed solution, adjusting the pH value of the mixed solution to be 10-11, and fully and uniformly stirringthe mixture to obtain a mixed solution S2; triggering a reaction on the mixed solution S2 by means of a hydrothermal method, cooling the solution to the room temperature, and performing centrifugal filtering to obtain a product; washing the product with deionized water until the pH value of a filtrate is neutral, performing washing with ethanol, conducting drying, and performing cooling until thecurrent temperature is equal to the room temperature to obtain the smokeless expandable graphite flame retardant. The flame retardant prepared by means of the preparation method has the advantages ofbeing free of halogen, toxin and corrosion, low in smoke content and the like. The flame retardant cannot generate toxic or harmful gas during combustion, combustion products are simple in chemical structure and free of toxin, no secondary pollutants are generated, and therefore the flame retardant is environmentally friendly.

Description

technical field [0001] The invention belongs to the field of flame retardant technology, and relates to a preparation method of a halogen-free flame retardant, in particular to a preparation method of a smokeless expandable graphite flame retardant. Background technique [0002] Among intumescent flame retardants, expandable graphite is one of the most commonly used flame retardants. It is a structure in which sulfuric acid molecules are inserted into graphite layers after natural graphite is treated with sulfuric acid; at high temperatures, the carbon layer will It expands into a worm-like structure with a low density, forming a very good insulating layer, and achieves a flame-retardant effect; as a halogen-free and environmentally friendly flame retardant, expandable graphite has the advantages of being non-toxic and halogen-free, and does not corrode when heated Non-toxic gas; small amount of addition; no dripping; strong environmental adaptability, no migration phenomeno...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K9/02C08K3/04C08L29/04
CPCC08K3/04C08K9/02C08K9/10C08K2201/003C08L2201/02C08L2201/22C08L29/04
Inventor 王育华宁浩哲马忠英
Owner LANZHOU UNIVERSITY
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