Organic and inorganic microcapsule coating expansible graphite preparation method

A technology of expanded graphite and microcapsules, applied in microcapsule preparations, microsphere preparation and other directions, can solve problems such as difficulty in extinguishing, threats to life and property, and generation of toxic fumes, and achieves improved compatibility, strong operability, and improved resistance. The effect of flammability

Active Publication Date: 2015-05-13
BEIJING ACAD OF BUILDING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development and progress of society, polymer materials have developed rapidly in recent decades and have been widely used in various fields. Their production volume is increasing year by year, and they are increasingly used in various aspects of the national economy and people's lives. Most polymer materials are flammable materials, and they are not easy to extinguish. When burning, a large amount of toxic smoke is produced, which poses a serious threat to people's lives and property. Therefore, the flame retardancy of polymer materials has become the focus of attention in the world.

Method used

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  • Organic and inorganic microcapsule coating expansible graphite preparation method
  • Organic and inorganic microcapsule coating expansible graphite preparation method
  • Organic and inorganic microcapsule coating expansible graphite preparation method

Examples

Experimental program
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Effect test

example 1

[0026] 1) Add 5 parts of expandable graphite with an average particle size of 100 μm to 100 parts of water, and ultrasonically sonicate for 60 minutes, then add it to a three-necked flask for stirring, heat to 50°C, add 20 g of aluminum sulfate aqueous solution, stir for 30 minutes, drop Add a certain amount of 10% Na 2 CO 3 Adjust the pH of the aqueous solution to 7 and keep stirring for 1.5 hours;

[0027] 2) Add 40 parts of melamine formaldehyde resin solution into the flask, stir and disperse at 50°C, stir for 15 minutes, then cool to room temperature, adjust the pH value to 3 with acetic acid, slowly heat up to 50°C, and stir for 60 minutes, cool, and use 10%Na 2 CO 3 The pH of the aqueous solution is adjusted to be 7;

[0028] 3) The mixture obtained in 2) was left to stand for 6 hours, then suction-filtered, washed, and dried at 60°C to obtain expandable graphite coated with melamine formaldehyde-aluminum hydroxide.

example 2

[0030] 1) Add 5 parts of expandable graphite with an average particle size of 50 μm to 100 parts of water, and ultrasonically sonicate for 30 minutes, then add it to a three-necked flask for stirring, heat to 50°C, add 30 parts of aluminum sulfate aqueous solution, and stir for 30 minutes, A certain amount of 10% Na was added dropwise 2 CO 3 Adjust the pH of the aqueous solution to 8 and keep stirring for 2 hours;

[0031] 2) Add 20 parts of melamine formaldehyde resin solution into the flask, stir and disperse at 60°C, stir for 20min, then cool to room temperature, adjust the pH value to 4 with acetic acid, slowly heat up to 60°C, and stir for 90min, cool, use 10%Na 2 CO 3 The pH of the aqueous solution is adjusted to be 8;

[0032] 3) The mixture obtained in 2) was left to stand for 6 hours, then suction-filtered, washed, and dried at 60°C to obtain expandable graphite coated with melamine formaldehyde-aluminum hydroxide.

example 3

[0034] 1) Add 30 parts of expandable graphite with an average particle size of 200 μm to 100 parts of water, and ultrasonically sonicate for 90 minutes, then add it to a three-necked flask for stirring, heat to 65°C, add 40 parts of aluminum sulfate aqueous solution, and stir for 120 minutes, A certain amount of 10% Na was added dropwise 2 CO 3 Adjust the pH of the aqueous solution to 8.5 and keep stirring for 3 hours;

[0035] 2) Add 30g of melamine formaldehyde resin solution into the flask, stir and disperse at 65°C, stir for 30min, then cool to room temperature, adjust the pH value to 4.5 with acetic acid, slowly heat up to 65°C, and stir for 120min, cool, use 10 %Na 2 CO3 The pH of the aqueous solution is adjusted to 8.5;

[0036] 3) The mixture obtained in 2) was left to stand for 6 hours, then suction-filtered, washed, and dried at 60°C to obtain expandable graphite coated with melamine formaldehyde-aluminum hydroxide.

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Abstract

The invention relates to the field of microcapsule coating expansible graphite, and discloses an organic and inorganic microcapsule coating expansible graphite preparation method. The organic and inorganic microcapsule coating expansible graphite is a semi-transparent solid small particle which is white in appearance, and black inside, a capsule material is a polymer resin and inorganic compound dual-material component, and the average particle size of a capsule core is 50-200mu. m. The method comprises two steps of: step 1, depositing a layer of inorganic compound on the surface of the expansible graphite at first, wherein the inorganic compound is a flame retardant, and a synergistic flame retardant effect is improved through the inorganic compound and the expansible graphite when the coated expansible graphite is heated; and step 2, adopting resin as the capsule material to coat the expansible graphite through utilizing an in-situ polymerization method. After the coating, the compatibility of the expansible graphite and organic matters is obviously improved, the expansion rate of the expansible graphite can be improved, the flame retardant effect is improved, and moreover, the initial expanding temperature of the expansible graphite can also be increased, and accordingly, the flame retardant application scope of the expansible graphite is widened.

Description

technical field [0001] The invention belongs to the technical field of microcapsule coating, in particular to a method for double-coating expandable graphite with polymer resin and inorganic compound, organic and inorganic. Background technique [0002] With the development and progress of society, polymer materials have developed rapidly in recent decades and have been widely used in various fields. Their production volume is increasing year by year, and they are increasingly used in various aspects of the national economy and people's lives. Most polymer materials are flammable materials, and they are not easy to extinguish. When burning, a large amount of toxic smoke is produced, which poses a serious threat to people's lives and property. Therefore, flame retardancy of polymer materials has become the focus of attention in the world. [0003] With the research and development of flame retardants, phosphorus-containing halogen flame retardants have been replaced by phosph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/10C08K3/04C08K3/22C08K3/38C08L61/28C08L75/04C08L75/02C08L61/06C08L77/00C08L79/02C08L63/00C08L67/08C08L71/14B01J13/02
Inventor 王万金贺奎樊勇董全霄夏义兵朱宁袁振
Owner BEIJING ACAD OF BUILDING ENG
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