Method for modifying melamine pyrophosphate fire retardant by grafting oxidized graphene

A technology of melamine pyrophosphate and melamine, applied in the field of materials, can solve the problems of large particle size, large addition, environmental pollution, etc., and achieve the effects of small impact on mechanical properties, small particle size and good dispersibility

Active Publication Date: 2014-07-09
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the melamine pyrophosphate (MPP) flame retardant prepared by the traditional synthesis method not only has a relatively large particle size, but also has a large addition and is ea

Method used

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  • Method for modifying melamine pyrophosphate fire retardant by grafting oxidized graphene
  • Method for modifying melamine pyrophosphate fire retardant by grafting oxidized graphene

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) 50.40g melamine and 26.59g anhydrous sodium pyrophosphate (Na 4 P 2 o 7 ), the molar ratio is 2:1, add it into 500ml distilled water, stir well, the stirring rate is 400r / min, and the stirring time is 30min, so that the system is dispersed evenly;

[0034] (2) Then, add 154 mL of graphene oxide (GO) colloidal solution dispersed by ultrasonic to the system of step (1), the solid content of the graphene oxide colloid is 0.025 g / mL, and the content of graphene oxide GO is 5% of melamine and anhydrous sodium pyrophosphate quality and, and with dripping the dilute nitric acid solution of catalysis, stabilizer, its concentration is 1mol / L, and rate of addition is 2ml / min, and the adjustment reaction system pH value is 4, The temperature was raised to 85°C, the stirring reaction time was 2 hours, and the stirring rate was 360rad / min;

[0035] (3) After the reaction is complete, the reaction product is suction filtered and washed, and the product is dried at 90°C for 48 ...

Embodiment 2

[0037] (1) 50.40g melamine and 26.59g anhydrous sodium pyrophosphate (Na 4 P 2 o 7 ), the molar ratio is 2:1, add it into 350ml distilled water, stir well, the stirring speed is 500r / min, and the stirring time is 15min, so that the system is dispersed evenly;

[0038] (2) Then, add 308ml of graphene oxide (GO) colloidal solution dispersed by ultrasonic to the system of step (1), the solid content of graphene oxide colloid is 0.025g / mL, and the content of graphene oxide GO is 10% of the mass sum of melamine and anhydrous sodium pyrophosphate, and dropwise the dilute nitric acid solution of catalysis and stabilizer, its concentration is 0.5mol / L, and the rate of addition is 2ml / min, and the pH value of the reaction system is adjusted to be 6 , the temperature was raised to 90°C, the stirring reaction time was 4 hours, and the stirring rate was 360rad / min;

[0039] (3) After the reaction is complete, the reaction product is suction filtered and washed, and the product is dried...

Embodiment 3

[0041] (1) 50.40g melamine and 26.59g anhydrous sodium pyrophosphate (Na 4 P 2 o 7 ), the molar ratio is 2:1, add it into 500ml distilled water, stir well, the stirring rate is 400r / min, and the stirring time is 30min, so that the system is evenly dispersed;

[0042](2) Then, add 462ml of graphene oxide (GO) colloidal solution dispersed by ultrasonic to the system of step (1), the solid content of the graphene oxide colloid is 0.05g / mL, and the content of graphene oxide GO is 30% of the mass sum of melamine and anhydrous sodium pyrophosphate, and dripping the dilute nitric acid solution of catalyst and stabilizer, its concentration is 0.5mol / L, and the rate of addition is 2ml / min, and the pH value of the adjustment reaction system is 4 , the temperature was raised to 85°C, the stirring reaction time was 4 hours, and the stirring rate was 360rad / min;

[0043] (3) After the reaction is complete, the reaction product is suction filtered and washed, and the product is dried at ...

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Abstract

The invention belongs to the material technical field, and relates to a preparation method for modifying a melamine pyrophosphate fire retardant by grafting oxidized grapheme, which comprises the following steps: adding melamine and anhydrous sodium pyrophosphate in distilled water, fully stirring for uniformly dispersing a system; adding an oxidized grapheme colloidal solution through ultrasonic dispersion in the above system, adding a protonic acid dilute solution of a stabilizing agent for catalysis drop by drop, adjusting pH value of the reaction system, heating, stirring, after the reaction is completed, performing pumping filtration on the reaction products, washing, and drying products to obtain the melamine pyrophosphate fire retardant. The preparation method has the advantages of high efficiency, easy operation and environmental protection, and the prepared halogen-free expansion-type fire retardant has the advantages of small particle size and high thermostability, can be used in a halogen free system of polyolefin, and can be used for polyamide, polyester, rubber and intumescent fire retardant paint.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a method for grafting graphene oxide to modify a melamine pyrophosphate flame retardant. Background technique [0002] Traditional halogen-based flame retardants are widely used in the production of flame-retardant materials because of their high flame-retardant efficiency. However, halogen-based flame-retardant products produce a large amount of smoke and toxic corrosive gases when burned, which hinders the evacuation of personnel and causes serious secondary disaster. At present, intumescent flame retardants (IFR) are highly valued for their advantages of halogen-free, low-smoke, and low-toxicity. Melamine (MEL) and its salts (cyanurate, phosphate, pyrophosphate, polyphosphate, borate, phthalate, oxalate, etc.) are a class of nitrogen and nitrogen-phosphorus It is a flame retardant and is an important component (including gas source and salt) of halogen-free intumescent flame...

Claims

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Application Information

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IPC IPC(8): C08K9/02C08K5/3492C08L23/00C08L77/00C08L67/00C08L77/02
Inventor 杨桂生杨军明
Owner HEFEI GENIUS NEW MATERIALS
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