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Preparation method for dendritic organic/inorganic hybrid fire retardant

A dendritic and flame retardant technology, which is applied in the field of preparation of dendritic organic/inorganic hybrid flame retardants, can solve the problem that there are not many researches on liquid crystal flame retardant, and achieve improved flame retardant and mechanical properties and high thermal stability. , the effect of considerable economic benefits

Inactive Publication Date: 2013-12-11
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, many researchers have devoted themselves to the research of liquid crystals, but there are not many researches on the flame retardancy of liquid crystals.

Method used

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  • Preparation method for dendritic organic/inorganic hybrid fire retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 14g of p-nitroaniline, 7.5g of sodium nitrite and 28ml of distilled water into a thin paste, slowly pour it into a flask filled with 30ml of concentrated hydrochloric acid and 30g of crushed ice, stir and react at 0°C, and filter out the insoluble matter after 10min . Add 20ml of ethanol solution containing phenol (9g of phenol), adjust the pH value of the solution to 8 with 5% sodium hydroxide solution, continue stirring the reaction mixture at 0°C for 1h, adjust the pH value of the system between 6 with dilute hydrochloric acid, At this time, the system is brownish red, heated and filtered, washed with water, and dried. The crude product was recrystallized with 95% ethanol and dried in vacuo to obtain purple-red crystals which were p-nitroazophenol.

[0027] 12g of p-nitroazophenol, 10g of 1,3-dibromopropane, 18g of anhydrous potassium carbonate, 0.5g of potassium iodide in 200ml of acetone, heated to reflux for 18h. After cooling the reaction mixture to room te...

Embodiment 2

[0035]Mix 16g of p-nitroaniline, 8.5g of sodium nitrite and 42ml of distilled water into a thin paste, slowly pour it into a flask filled with 45ml of concentrated hydrochloric acid and 40g of crushed ice, stir and react at 5°C, and filter out the insoluble matter after 20min . Add 25ml of ethanol solution containing phenol (10g of phenol), adjust the pH value of the solution to 8.5 with 5% sodium hydroxide solution, continue stirring the reaction mixture at 5°C for 1.5h, and adjust the pH value of the system between 6.5 with dilute hydrochloric acid , the system is brownish red at this time, heated and filtered, washed with water, and dried. The crude product was recrystallized with 95% ethanol and dried in vacuo to obtain purple-red crystals which were p-nitroazophenol.

[0036] 13g of p-nitroazophenol, 11g of 1,3-dibromopropane, 19g of anhydrous potassium carbonate, 1g of potassium iodide in 220ml of acetone, heated to reflux for 21h. After the reaction mixture was cooled...

Embodiment 3

[0044] Mix 18g of p-nitroaniline, 9.5g of sodium nitrite and 56ml of distilled water into a thin paste, slowly pour it into a flask filled with 60ml of concentrated hydrochloric acid and 50g of crushed ice, stir and react at 10°C, and filter out the insoluble matter after 30min . Add 30ml of ethanol solution containing phenol (phenol 11g), adjust the pH value of the solution to 9 with 5% sodium hydroxide solution, continue stirring the reaction mixture at 10°C for 2h, adjust the pH value of the system between 7 with dilute hydrochloric acid, At this time, the system is brownish red, heated and filtered, washed with water, and dried. The crude product was recrystallized with 95% ethanol and dried in vacuo to obtain purple-red crystals which were p-nitroazophenol.

[0045] 14g of p-nitroazophenol, 12g of 1,3-dibromopropane, 20g of anhydrous potassium carbonate, 1.5g of potassium iodide in 250ml of acetone, heated to reflux for 24h. After the reaction mixture was cooled to room...

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Abstract

The invention relates to a preparation method for a dendritic organic / inorganic hybrid fire retardant. The preparation method comprises the following steps: preparation of an N-methylimidazole quaternary ammonium salt; preparation of N-methylimidazole quaternary ammonium salt modified organic montmorillonite; preparation of p-azophenol organic montmorillonite; preparation of dendritic p-azophenol organic montmorillonite; and preparation of the flame retardant. Compared with the prior art, the invention has the following advantages: since a dendritic liquid crystal polymer containing phosphorus and nitrogen is used for modification, the fire retardant has high thermal stability; when applied to the rubber industry and the cable industry, the fire retardant can replace or partially replace traditional flame-retardant and reinforcing materials which have higher prices, are environmentally unfriendly and damage other properties of the polymer and can improve flame retardation and mechanical performance of rubber materials.

Description

technical field [0001] The invention relates to a method for preparing a flame retardant, in particular to a method for preparing a dendritic organic / inorganic hybrid flame retardant. Background technique [0002] Polymer materials such as plastics and rubber are widely used in daily life. These polymer materials are flammable or combustible, and will produce a lot of smoke and harmful gases when burned, causing serious economic losses and personal safety problems. Therefore, the flame retardancy of materials is the key. Commonly used halogenated flame retardants decompose a large amount of toxic smoke during combustion, which can easily poison and suffocate people present and affect vision and escape. According to early reports, halogenated flame retardants also have carcinogenic effects, so many developed countries have banned their use . Compared with halogen flame retardants, layered silicates such as montmorillonite have the advantages of low smoke, non-toxicity, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/04C08K3/34C08K5/5313C08L101/00
Inventor 王锦成孙凯孙一博潘晨赵雯王军华
Owner SHANGHAI UNIV OF ENG SCI
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