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Synergistically modified APP (ammonium polyphosphate), preparation method for same and application to flame-retardant polypropylene

An ammonium polyphosphate and modified technology, applied in the field of flame retardant, can solve the problems of improved water resistance and flame retardant performance, unfavorable industrial application, increased system viscosity, etc., and achieves improved flame retardant performance, low cost, and carbon layer expansion. height increase effect

Inactive Publication Date: 2015-08-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some disadvantages, such as isocyanate microencapsulation treatment of APP, which increases the viscosity of the system; melamine-formaldehyde resin encapsulation treatment of APP, there is free formaldehyde, and the phosphorus content is significantly reduced
Coupling agent modification treatment APP is environmentally friendly and feasible, but its water resistance and flame retardant performance are also limited, and the cost is too high, which is not conducive to industrial application
Therefore, existing modification methods still have shortcomings and deficiencies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Disperse 30 g of ammonium polyphosphate (APP, crystal type II) in 90 ml of absolute ethanol, stir evenly to obtain the dispersion of APP, and transfer to a 500 ml three-necked flask.

[0051] (2) Dissolve 1.5 g of aluminum chloride in 20 ml of distilled water to obtain a colorless and transparent solution.

[0052] (3) Under stirring, add the aluminum chloride solution dropwise to the dispersion of APP.

[0053] (4) Add 6 g of 25% ammonia water dropwise to the above mixed system, and the pH value at this time is 8.6. Raise the temperature to 50°C, 120min later, the reaction is complete, filter suction, wash off impurities, dry in an oven at 80°C, pulverize to obtain the surface modified APP-1 powder, and then water the obtained APP-1 powder Solubility test, and use TG for thermal stability analysis.

[0054] Test result: The water solubility of ammonium polyphosphate at 25°C decreased from 1.0135g / 100mL before modification to 0.2975g / 100mL after modification, a decrease of...

Embodiment 2

[0061] (1) Disperse 10 g of ammonium polyphosphate (APP, crystal type II) in 100 ml of isopropanol, stir evenly to obtain a dispersion of APP, and transfer to a 500 ml three-necked flask.

[0062] (2) Dissolve 2 g of aluminum sulfate in 20 ml of distilled water to obtain a colorless and transparent solution.

[0063] (3) While stirring, add the aluminum sulfate solution dropwise to the dispersion of APP.

[0064] (4) Add 5 g of 20% ammonia water dropwise to the above mixed system, and the pH value at this time is 8.7. Raise the temperature to 60°C, 100min later, the reaction is complete, suction filter, wash off impurities, dry in a 90°C oven, pulverize to obtain the surface modified APP-2 powder, and then water the obtained APP-2 powder Solubility test, and use TG for thermal stability analysis.

[0065] Test result: The water solubility of ammonium polyphosphate at 25°C decreased from 1.0135g / 100mL before modification to 0.3375g / 100mL after modification, a decrease of 67%. TG resu...

Embodiment 3

[0069] (1) Disperse 20 g of ammonium polyphosphate (APP, crystal type II) in 100 ml of absolute ethanol, stir evenly to obtain a dispersion of APP, and transfer to a 500 ml three-necked flask.

[0070] (2) Weigh 3g aluminum isopropoxide and dissolve it in 250ml anhydrous methanol.

[0071] (3) Under stirring, the methanol solution of aluminum isopropoxide was added dropwise to the dispersion of APP.

[0072] (4) Finally, add 2ml of distilled water dropwise. Raise the temperature to 85°C, after 60 minutes, the reaction is complete, filter with suction, wash off impurities, dry in an oven at 110°C, and finally pulverize to obtain modified APP-3. Then the obtained APP-2 powder was tested for water solubility, and TG was used for thermal stability analysis.

[0073] Test results: The water solubility of ammonium polyphosphate at 25°C decreased from 1.0135g / 100mL before modification to 0.2615g / 100mL after modification, a decrease of 74%. TG results under nitrogen atmosphere showed that t...

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Abstract

The invention belongs to the technical field of flame retardance, and relates to a synergistic modification technology for an inorganic phosphorus-containing flame retardant APP (ammonium polyphosphate), in particular to synergistically modified APP, a preparation method for the same and application to flame-retardant polypropylene. In a solution system, an aluminum-containing compound with different chemical properties is selected as a precursor of a surface layer modification material, reaction is performed on the surface of an APP particle to generate a layer of ultrafine water-insoluble substances in situ to improve the performance of the APP such as hygroscopicity, water resistance, flame retardance and compatibility with a polymer, a micron-nanometer composite particle employing the APP as a matrix and employing aluminum hydroxide as a surface layer is finally prepared, and in addition, the effects of ultrafine treatment, surface modification, flame-retardant synergism and the like of the APP are achieved.

Description

Technical field [0001] The invention relates to a synergistic modification technology of an inorganic phosphorus-containing flame retardant ammonium polyphosphate (APP), in particular to a synergistic modified ammonium polyphosphate, a preparation method thereof and an application in flame-retardant polypropylene, belonging to Flame retardant technology field. Background technique [0002] Ammonium polyphosphate (APP) is one of the most important varieties of inorganic phosphorus flame retardants. This type of flame retardant has been widely used due to its superior performance. Especially in recent years, in the voice of protecting the ecological environment, this kind of flame retardant has attracted more and more attention and developed rapidly. In the past ten years, the halogen-free intumescent flame retardant (IFR) based on APP has become the current research hotspot of flame retardant technology due to its non-toxicity, low smoke and no droplet during combustion. A typi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K3/32C08K3/22C08L23/12C08K13/06C08K5/06
Inventor 李定华秦兆鲁杨荣杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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