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High-efficiency flame-retardant coating with fire warning and self-repair functions, its preparation method and application

A technology of fire early warning and flame retardant coatings, which is applied in the direction of fire retardant coatings, hyaluronic acid coatings, chitin polysaccharide coatings, etc., can solve the problems of low sensitivity of fire warning systems and flammability of light materials, and achieve excellent thermal stability and Barrier performance, excellent char formation performance, good adhesion effect

Active Publication Date: 2020-02-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-efficiency flame-retardant coating with sensitive fire early warning and outstanding self-repairing function and its preparation method in view of the flammable defects of light materials and the low sensitivity of the current fire early warning system

Method used

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  • High-efficiency flame-retardant coating with fire warning and self-repair functions, its preparation method and application
  • High-efficiency flame-retardant coating with fire warning and self-repair functions, its preparation method and application
  • High-efficiency flame-retardant coating with fire warning and self-repair functions, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Synthesis of intermediates: at 100°C, add 4g of 2-amino-4-methylpyrimidine and 30g of dimethylbiphenyl diisocyanate into a 150mL four-necked flask, and make 2-amino- 4-methylpyrimidine is well dispersed. Then react for 12h under the protection of nitrogen. After the reaction was finished, the mixed solution was left to cool, and 50 mL of n-pentane was added to precipitate the reaction product. The product was isolated by suction filtration, soaked and washed with n-pentane and suction filtered again, and the washing process was repeated 4 times. The intermediate product was obtained after drying in an oven at 80 °C for 8 h.

[0037] 2) Synthesis of functional chain-like natural polymers: Add 3 g of hydroxypropyl methylcellulose, 1 g of the intermediate synthesized in step 1) and 100 mL of ethylene glycol into a 250 mL four-neck flask, and stir them ultrasonically for 30 min to fully disperse them. Add 0.03g of cobalt octoate and protect it with nitrogen, and raise...

Embodiment 2

[0045] The difference between this embodiment and Example 1 is: in step 1), 2-amino-4-methylpyrimidine is replaced by 2-methyl-4-aminopyrimidine, and 30g dimethyl biphenyl diisocyanate is replaced by 40g 1 , 6-hexamethylene diisocyanate, the mechanical stirring time was shortened to 20min, the reaction temperature was reduced to 90°C, and the reaction time was shortened to 10h. The solvent used to precipitate the product and wash it was changed to isopropanol, and the drying time was reduced to 12 hours. The vertical combustion, fire warning and self-healing test results are shown in Table 1, Table 2 and Table 3, and the relevant test methods are the same as in Example 1.

Embodiment 3

[0047] The difference between this example and Example 1 is that in step 1), 4g of 2-amino-4-methylpyrimidine is replaced by 3g of 2-amino-4,6-dimethylpyrimidine, and 30g of dimethyl biphenyl diisocyanate Replaced with 12g of 4,4-diisocyanate dicyclohexylmethane, the reaction was raised to 130°C, and the reaction time was extended to 24h. The solvent used to precipitate and wash the product was changed to n-hexane, and the amount used for precipitation was changed to 100 mL. The drying temperature was increased to 100°C, and the drying time was increased to 20h. The vertical combustion, fire warning and self-healing test results are shown in Table 1, Table 2 and Table 3, and the relevant test methods are the same as in Example 1.

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Abstract

Efficient flame retardant coating having fire pre-warning and self-repairing functions, and a preparing method and application thereof are disclosed. The method includes modifying a chain natural polymer with a functional group capable of forming multiple hydrogen bonds, then mixing and dispersing the synthesized functionalized chain natural polymer together with graphene oxide into water to prepare the coating. Compared with the prior art, the prepared coating has wide applicability and can be applied to various flammable substrates such as plastic, wood and foam by a convenient method such as dip coating and spraying. A flame retardant coating layer formed by the coating not only has high flame retardant performance, but also has a sensitive fire pre-warning function and an outstanding self-repairing function, thus endowing flammable materials with reliable fire safety. The coating prepared can be applied to the fields having high fire safety requirements, such as the field of transportation, the field of furniture electrical appliances, the field of building decoration, and the field of wires and cables.

Description

technical field [0001] The invention relates to flame-retardant coatings, in particular to a high-efficiency flame-retardant coating with fire warning and self-repairing functions, a preparation method and application thereof. Background technique [0002] With the development of society, people's demand for lightweight materials is increasing. However, most lightweight materials (such as polymer materials and wood, etc.) have flammable defects. While their wide application brings convenience to people, there are also huge potential safety hazards. In recent years, major fires caused by lightweight materials have become more and more frequent. For example, in the early morning of June 14, 2017, a major fire accident occurred in the "Grenfell Tower", a 24-story apartment in London, killing 79 people. The cause of the accident was that, on the one hand, the building used flammable external wall insulation materials, and on the other hand, the building lacked an effective fire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D101/28C09D105/08C09D5/18C09D7/61C08J7/05C08J9/42B27K3/52C08B15/06C08B37/08C08L75/04C08L23/12
CPCB27K3/52C08B15/06C08B37/003C08J7/0427C08J9/42C08J2323/12C08J2375/04C08K2201/011C09D5/18C09D7/61C09D101/284C09D105/08C08K7/00C08K3/042
Inventor 赖学军谢华理曾幸荣李红强张时峰曹逸鹏
Owner SOUTH CHINA UNIV OF TECH
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