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A kind of modified expandable graphite, flame retardant and its preparation method and application in polyurethane foam

An expanded graphite and flame retardant technology, 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, reduced peak heat release rate, and lasting flame retardant effect. Effect

Active Publication Date: 2022-05-13
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 flame retardancy, long-lasting flame retardancy, greatly improved oxygen index, and low heat release rate. Modified expandable graphite with greatly reduced peak value, flame retardant and its preparation method and application in polyurethane foam

Method used

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  • A kind of modified expandable graphite, flame retardant and its preparation method and application in polyurethane foam
  • A kind of modified expandable graphite, flame retardant and its preparation method and application in polyurethane foam
  • A kind of modified expandable graphite, flame retardant and its preparation method and application 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, in particular to a modified expandable graphite, a flame retardant and its preparation method and its application in polyurethane foam, which is characterized in that one or more layers are adsorbed on the surface of the expandable graphite A polymer surface modifier with special functional groups, the preparation method of the modified expandable graphite includes: using an organic modifier containing a hydroxyl group and a polar six-membered ring structure to modify the surface of the expandable graphite, and adding a dispersant to mix The modified graphite can be obtained by crushing and sieving after uniformity. After the modified graphite is added to the polyurethane combination polyether in a certain proportion and mixed evenly, it can be uniformly dispersed and suspended in the polyether; and the flame retardant performance of the obtained polyurethane insulation material is Greatly improved and does not affect other properties of polyurethane rigid foam, it has the advantages of good flame retardant performance, long-lasting flame retardant effect, greatly improved oxygen index, and greatly reduced peak heat release rate.

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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Patent Type & Authority Patents(China)
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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