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A kind of high flame retardancy and high temperature resistant nylon composite material and preparation method thereof

A nylon composite material, high flame retardant technology, applied in the field of flame retardant and high temperature resistant nylon synthesis, can solve the problems of expensive carbon nanotubes and ionic liquids, high cost of synergistic flame retardants, material performance degradation, etc., to facilitate industrialization promotion The implementation and preparation method are simple and efficient, and the effect of good mechanical properties

Active Publication Date: 2019-05-31
GUANGDONG JUHANG INST FOR ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the first two patents mentioned above, due to the high price of carbon nanotubes and ionic liquids, the cost of grafting hexachlorocyclotriphosphazene to prepare synergistic flame retardants is high, which has great limitations in practical applications and is not suitable for industrial application
In addition, when hexachlorocyclotriphosphazene or its derivatives are directly added as a flame retardant, the material will have the phenomenon of migration of small molecule flame retardants, resulting in material performance degradation and affecting the use effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1. In this example, under the action of ultrasound, 2.0g of expanded graphite was uniformly dispersed in 200ml of a mixed acid of perchloric acid and concentrated nitric acid (Hammet's acidity function HO value is less than -10), and then heated to Continuous ultrasonic at 60°C for 2~3h, filtered under reduced pressure, washed with a large amount of deionized water and methanol several times, and dried in vacuum to obtain carboxylated expanded graphite.

[0026] Weigh 1.1g of carboxylated expanded graphite and disperse it in 100ml of dry dimethyl sulfoxide solution, add 0.2g of sodium hydride, reflux at 50℃ for 1h, and then slowly add 50ml dropwise to dissolve 2g of hexachlorocyclotriphosphazene After the addition of the dimethyl sulfoxide solution, the temperature is raised to 80℃ and the reaction is continued for 12h. After filtering under reduced pressure, washing with a large amount of deionized water and acetone, and vacuum drying, the grafted hexachlorocyclotr...

Embodiment 2

[0029] Example 2. The difference between this example and Example 1 is that the prepared hexachlorocyclotriphosphazene grafted modified expanded graphite 25%, PA6T 50%, PA66 20%, stabilizer 1.5%, antioxidant 0.5 %, 1.5% lubricant, 1.5% coupling agent, mixed evenly with a high-speed mixer, granulated by a twin-screw extruder to obtain a high flame-retardant high-temperature nylon composite material.

[0030] After testing, the above composite material has an oxygen index of 31 and a tensile strength of 92Mpa.

Embodiment 3

[0031] Example 3. In this example, under the action of ultrasound, 5.0g of expanded graphite was uniformly dispersed in a mixed acid of 400ml of concentrated sulfuric acid and concentrated nitric acid (Hammet's acidity function HO value is less than -9), and then heated to 60 Continue ultrasonic for 3~4h at ℃, filter under reduced pressure, wash with a large amount of deionized water and ethanol several times, and dry in vacuum to obtain carboxylated expanded graphite.

[0032] Weigh 3g of carboxylated expanded graphite and disperse it in 200ml of dry N,N-dimethylformamide solution, add 0.5g of sodium hydride and reflux at 50℃ for 1.5h, then slowly add 150ml dropwise to dissolve 5g of hexachloro After the addition of cyclotriphosphazene in N,N-dimethylformamide, the temperature is raised to 80°C and the reaction is continued for 18h. After filtering under reduced pressure, washing with a large amount of deionized water and acetone for many times, and drying in vacuo, it can be obt...

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Abstract

The invention discloses a high-flame-retardancy nylon composite material resistant to high temperature and a preparing method thereof. The composite material comprises, by weight, 50-85% of polyamide, 6-45% of flame retardant, 0.1-2% of stabilizer and 0.1-12% of other auxiliaries, wherein the flame retardant is hexachloro cyclotriphosphazene graft modified expanded graphite. Nitrogen, phosphorus, chlorine and organic carbon are combined, the synergistic flame retardant capacity can be remarkably improved, the phosphonitrile flame retardant is fixed to the surface of expanded graphite through chemical bonds, dispersity and compatibility of the expanded graphite in a resin matrix are improved, and the problem that small molecular flame retardant in the using process migrates outwards easily is solved.

Description

Technical field [0001] The invention relates to the technical field of flame-retardant and high-temperature resistant nylon synthesis, in particular to a high-flame-retardant and high-temperature resistant nylon composite material and a preparation method thereof. Background technique [0002] High temperature resistant nylon has excellent properties and is widely used in the electrical and electronic industries, the electronics industry and the automotive industry. Although high temperature resistant nylon has excellent heat resistance, there is a big gap between its flame retardant performance and actual requirements, which greatly limits its application in many fields. Therefore, it is urgent and necessary to improve the flame-retardant properties of high-temperature nylon. [0003] Hexachlorocyclotriphosphazene is widely used as fire-retardant and self-extinguishing material because of its high content of nitrogen, phosphorus and chlorine elements and good reactivity. However...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/06C08K13/06C08K9/04C08K9/02C08K7/24C08K5/5399
CPCC08K5/5399C08K7/24C08K9/02C08K9/04C08K13/06C08L77/06C08L2201/02C08L2201/08C08L2205/025
Inventor 唐孝芬魏珊珊陈旭东李素英吴浪许宏武杜惠娟
Owner GUANGDONG JUHANG INST FOR ADVANCED MATERIALS CO LTD
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