Modified expandable graphite, flame retardant as well as preparation method and application thereof in polyurethane foam

A technology of expanded graphite and flame retardant, which is applied in the field of flame retardants, can solve the problems of poor flame retardant performance and uneven dispersion of graphite particles, and achieve good flame retardant performance, lower peak heat release rate, and long-lasting flame retardant effect Effect

Active Publication Date: 2019-06-04
WEIHAI YUNSHAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing graphite particles are not uniformly dispersed in the polyurethane matrix, which leads to its poor flame retardancy, and to provide a graphite particle with good

Method used

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  • Modified expandable graphite, flame retardant as well as preparation method and application thereof in polyurethane foam
  • Modified expandable graphite, flame retardant as well as preparation method and application thereof in polyurethane foam
  • Modified expandable graphite, flame retardant as well as preparation method and application thereof in polyurethane foam

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preparation example Construction

[0022] A preparation method of modified expandable graphite, characterized in that the preparation process steps of the modified expandable graphite are as follows: (1) Shaping process: put the expandable graphite into a mechanical impact mill for shaping, and then vibrate Sieve classification, return to re-production if it is less than 80 mesh, and enter the next modification section if it is 80-150 mesh, and it will be processed separately if it is larger than 150 mesh; (2) Modification process: the 80-150 mesh expandable graphite obtained in step (1) Put it into the mixer, stir at a low speed, the speed is 50-85r / min, add the polymer surface modifier, after stirring for 10-15 minutes, increase the speed to 150-200r / min, stir for 20-30 minutes, then 80 The modified expandable graphite can be obtained by sieving. The step (2) modified expandable graphite is spherical or ellipsoidal particles, and the wetting angle is 78-80°, and the volume resistivity is 0.10-0.30Ω. cm, the t...

Embodiment 1

[0033] S1: Put the expandable graphite into a mechanical impact mill for shaping, then classify with a vibrating sieve, and screen out 100 parts of the shaped graphite under the 80 mesh sieve and on the 120 mesh sieve;

[0034] S2: Under low-speed stirring (50-85r / min), add 100 parts of 80-120 mesh expandable graphite obtained in step (1) and the following materials in sequence. After stirring for 10-15 minutes, increase the speed to 150-200r / min, stir for 20-30 minutes, and then sieve through 80 mesh;

[0035]

[0036] After testing, the obtained modified expandable graphite is ellipsoidal particles with a wetting angle of 78°, a volume resistivity of 0.19Ω cm, a thermal conductivity of 12.7 W / (m K), and a bulk density of 0.21 g cm -3 . Particle size distribution: D10≤25um (500 mesh); D50≤125um (120 mesh); D90≤150um (100 mesh); D max ≤170um (80 mesh).

[0037] S3: Add 4 parts of organic bentonite to the above-mentioned modified expandable graphite, and mix uniformly in ...

Embodiment 2

[0040] S1: Put the expandable graphite into a mechanical impact mill for shaping, then classify with a vibrating sieve, and screen out 100 parts of the shaped graphite under the 80 mesh sieve and on the 120 mesh sieve;

[0041] S2: Under low-speed stirring (50-85r / min), add 100 parts of 80-120 mesh expandable graphite obtained in step (1) and the following materials in sequence. After stirring for 10-15 minutes, increase the speed to 150-200r / min, stir for 20-30 minutes, and then sieve through 80 mesh;

[0042]

[0043] After testing, the obtained modified expandable graphite is ellipsoidal particles with a wetting angle of 78°, a volume resistivity of 0.22Ω cm, a thermal conductivity of 13.0 W / (m K), and a bulk density of 0.16 g cm -3 . Particle size distribution: D10≤35um (400 mesh); D50≤125um (120 mesh); D90≤170um (80 mesh); D max ≤300um (50 mesh).

[0044] S3: Add 2 parts of nano-calcium carbonate to the above-mentioned modified expandable graphite, and mix uniformly...

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Abstract

The invention relates to the technical field of flame retardants, and specifically relates to modified expandable graphite, a flame retardant, a preparation method and application thereof in polyurethane foam, and the modified expandable graphite is characterized in that one or more layer of polymer surface modifying agents with special functional groups is /are adsorbed on the surface of expandable graphite, the preparation method of the modified expandable graphite comprises: carrying out surface modification on the expandable graphite by using an organic modifier containing hydroxyl and a polar six-membered ring structure, adding a dispersing agent, uniformly mixing, and crushing and sieving to obtain the modified graphite; after adding of the modified graphite into polyurethane composite polyether according to a certain ratio and uniform mixing, the modified graphite can be uniformly dispersed and suspended in the polyether; the flame retardancy of the obtained polyurethane thermalinsulation material is greatly improved, the other performances of the polyurethane rigid foam are not influenced, the flame retardancy is good, the flame retardant effect is durable, the oxygen index is greatly improved, and the heat release rate peak value is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of flame retardants, in particular to a modified expandable graphite with good flame retardant performance, long-lasting flame retardant effect, greatly increased oxygen index, and greatly reduced peak heat release rate, a flame retardant and its preparation Method and use in polyurethane foam. Background technique [0002] As we all know, polyurethane foam has the advantages of low density, high strength, excellent mechanical properties, good processing performance, and convenient construction, and is widely used in various fields. However, because polyurethane materials contain combustible carbon ammonia chain segments, large specific surface area, low density and low thermal conductivity, they are easy to burn, and release toxic gases such as HCN and CO during the combustion process, which poses a great threat to personal safety and limits its further development. [0003] As a new type of intumescent f...

Claims

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Application Information

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IPC IPC(8): C08K9/04C08K7/24C08K3/34C08L75/04C08J9/04
CPCC08K3/34C08J9/04C08K7/24C08L75/04C08K9/04
Inventor 费连东程瑾宁李铭佶包彦彦龙燕
Owner WEIHAI YUNSHAN TECH
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