Expandable graphite flame retardant coated with nano particles on surface and preparation method thereof

A technology of expanded graphite and nano particles, which is applied in the field of expandable graphite halogen-free flame retardants, can solve the problems of no increase in the expansion ratio of expandable graphite, poor compatibility between expandable graphite and polyurethane matrix, etc., and achieve optimal compatibility, The effect of increasing the expansion ratio and improving the flame retardant effect

Active Publication Date: 2018-06-01
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although expandable graphite and metal hydroxide have a synergistic flame retardant effect, the expansion ratio of expandable graphite itself has not been improved, and the problem of poor compatibility between expandable graphite and polyurethane matrix has not been solved.

Method used

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  • Expandable graphite flame retardant coated with nano particles on surface and preparation method thereof
  • Expandable graphite flame retardant coated with nano particles on surface and preparation method thereof
  • Expandable graphite flame retardant coated with nano particles on surface and preparation method thereof

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preparation example Construction

[0057] Another specific embodiment of the present invention discloses a preparation method of an expandable graphite flame retardant coated with nanoparticles on the surface. When performing a coating, the specific process steps are as follows:

[0058] Step 1. Add the metal salt and expandable graphite into the three-necked flask at the same time, add enough water or distilled water to dissolve the metal salt, and completely dissolve the metal salt by stirring at 200rad / min to 800rad / min;

[0059] Step 2. Use alkaline solution to adjust the pH of the solution. When the set pH value is reached, start to heat up to 50°C-90°C, and ripen in the temperature range of 40°C-95°C for 1h-24h, and the stirring rate during ripening is 100rad / min-500rad / min, and finally air-cooled to room temperature;

[0060] Step 3. Washing with an appropriate amount of water or distilled water, filtering, and drying to obtain an expandable graphite flame retardant coated with a metal hydroxide nanopar...

Embodiment 1

[0081] Add 88.5g of aluminum sulfate octadecahydrate, 25g of 50-mesh EG and 500ml of deionized water into a 1000ml three-necked flask, adjust the pH to 4 with sodium hydroxide solution, raise the temperature to 80°C, reflux for 6 hours, and cool down to room temperature , washed with sufficient deionized water, filtered, and dried to obtain gray powder EG@ATH, whose SEM is as follows Picture 1-1 , 1-2 shown. The expansion ratio results are shown in Table 1. Expansion rate from 163ml g -1 Increased to 197ml g-1 .

Embodiment 2

[0083] Add 88.5g of aluminum sulfate octadecahydrate, 11.16g of 50-mesh EG and 500ml of deionized water into a 1000ml three-neck flask, adjust the pH to 4.5 with sodium hydroxide, heat up to 90°C, reflux for 8 hours, and cool down to room temperature , washed with sufficient deionized water, filtered, and dried to obtain gray powder EG@ATH. The expansion ratio results are shown in Table 1. Expansion rate from 163mlg -1 Increased to 197ml g -1 .

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Abstract

The invention relates to an expandable graphite flame retardant coated with nano particles on the surface. The surface of expandable graphite is coated with one or more layers of metal hydroxide nanoparticles. Moreover, the invention further discloses a preparation method of the expandable graphite flame retardant coated with the nano particles on the surface. Compared with traditional expandablegraphite, the flame retardant provided by the invention has the benefits that the expansion rate of the flame retardant is further improved; by taking a metal hydroxide nano particle layer as a housing, on one hand, the gas release of the expandable graphite in the expansion process can be prevented, so that the expansion rate is improved; on the other hand, the compatibility of the flame retardant with a polyurethane material can be improved, so that the interaction between the flame retardant and a matrix is increased, and the problem of poor compatibility of the expandable graphite flame retardant with the polyurethane material is solved.

Description

technical field [0001] The invention relates to the technical field of expandable graphite halogen-free flame retardants, in particular to an expandable graphite flame retardant coated with nanoparticles on the surface and a preparation method thereof. Background technique [0002] Polyurethane has excellent mechanical properties, good processing performance, various processing methods, and a large degree of freedom in molecular design, and is widely used in various fields. With the rapid development of modern science and technology and the continuous improvement of human living standards, the demand for polyurethane materials in human production and life is also increasing. Because polyurethane materials contain combustible carbon-ammonia chain segments, low density, large specific surface area, and are easy to burn, they pose a great threat to personal safety and limit their further development. [0003] Expandable graphite has the advantages of low price, abundant resour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K7/24C08L75/04
Inventor 阳明书王银涛王峰张世民丁艳芬高冲刘鹏
Owner INST OF CHEM CHINESE ACAD OF SCI
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