Method for preparing core-shell silicon dioxide-coated ammonium polyphosphate (APP)

A technology for coating ammonium polyphosphate and silicon dioxide, which is applied in the direction of silicon dioxide, silicon oxide, chemical instruments and methods, etc., can solve the problems of frosting strength, insufficient, unsuitable ammonium polyphosphate coating, etc., and reduce the dosage , low water solubility, excellent hydrophobic effect

Active Publication Date: 2010-06-30
浙江富锦新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silica coating method used in this invention is not suitable for the coating of ammonium polyphosphate. Therefore, in order to solve the problems of "frost" and insufficient strength caused by APP migration, it is necessary to explore an effective ammonium polyphosphate coating. Cover method

Method used

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  • Method for preparing core-shell silicon dioxide-coated ammonium polyphosphate (APP)
  • Method for preparing core-shell silicon dioxide-coated ammonium polyphosphate (APP)
  • Method for preparing core-shell silicon dioxide-coated ammonium polyphosphate (APP)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 100 grams of ammonium polyphosphate are added to an aqueous ethanol solution prepared from 100 grams of ethanol and 200 grams of water. The average particle size of the added ammonium polyphosphate particles is about 12 microns.

[0028] (2) Under sufficient stirring, add ammoniacal liquor to the solution of step (1) to adjust the pH value of the solution to 10, then add dropwise 200ml of ethanol solution of tetraethyl orthosilicate with a molar concentration of 0.1mol / L, drop Then stir well for 3 hours. Control the reaction temperature of step (1) and step (2) in the range of 15-35°C.

[0029] (3) Add 2 grams of titanate coupling agent TC-311 to the slurry obtained in step (2) for surface treatment, the surface treatment temperature is 90°C, the treatment time is 2 hours, and then filtered, washed and dried , to obtain silica-coated ammonium polyphosphate.

[0030] The ammonium polyphosphate obtained above is analyzed by scanning electron microscope and transmis...

Embodiment 2

[0032] (1) 200 grams of ammonium polyphosphate are added to an aqueous ethanol solution prepared from 100 grams of ethanol and 200 grams of water. The average particle size of the added ammonium polyphosphate particles is about 25 microns.

[0033] (2) under sufficient stirring, add ammoniacal liquor to the solution of step (1) to adjust the pH value of the solution to 9, then add dropwise the ethanol solution 48ml of tetraethyl orthosilicate whose molar concentration is 1mol / L, dropwise Stir well for another 4 hours. Control the reaction temperature of step (1) and step (2) in the range of 15-35°C.

[0034] (3) Add 2 grams of titanate coupling agent TC-311 to the slurry obtained in step (2) for surface treatment, the surface treatment temperature is 90°C, the treatment time is 2 hours, and then filtered, washed and dried , to obtain silica-coated ammonium polyphosphate.

Embodiment 3

[0036] (1) 150 grams of ammonium polyphosphate are added to the aqueous ethanol solution prepared by 120 grams of ethanol and 180 grams of water. The average particle size of the added ammonium polyphosphate particles is about 8 microns.

[0037] (2) under sufficient stirring, add ammoniacal liquor to the solution of step (1) to adjust the pH value of the solution to 11, then add dropwise the ethanol solution 720ml of tetraethyl orthosilicate whose molar concentration is 0.05mol / L, drop Then stir well for 3 hours. Control the reaction temperature of step (1) and step (2) in the range of 15-35°C.

[0038] (3) Add 2 grams of titanate coupling agent TC-311 to the slurry obtained in step (2) for surface treatment, the surface treatment temperature is 90°C, the treatment time is 2 hours, and then filtered, washed and dried , to obtain silica-coated ammonium polyphosphate.

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Abstract

The invention relates to a method for preparing core-shell silicon dioxide-coated ammonium polyphosphate (APP), which is characterized by comprising the following steps successively: (1) adding ammonium polyphosphate into ethanol water solution, stirring and dispersing well; (2) adding silicate ester ethanol solution into the solution obtained in the step (1) while the mass ratio of silicate ester to ammonium polyphosphate is 0.05-10:1, adjusting the pH value of the solution to 9-12 by adding alkaline solution, and then performing complete reaction at room temperature; and (3) adding couplingagent into the grout obtained in the step (2) to carry out surface treatment, and then filtrating, washing and drying to obtain the silicon dioxide-coated ammonium polyphosphate. On one hand, the ammonium polyphosphate flame retardant utilizes the synergistic flame retardance of silicon and phosphorus elements to increase retardant effectiveness and reduce dosage, thereby bringing down the negative effects of APP; on the other hand, the ammonium polyphosphate flame retardant utilizes the advantages of silicon dioxide, such as excellent hydrophobicity, heat resistance, high strength and the like, to further solve the problems of APP such as infiltration and migration, influence on product strength, insufficient heat resistance and the like.

Description

technical field [0001] The invention relates to a method for preparing ammonium polyphosphate, in particular to a method for preparing ammonium polyphosphate coated with core-shell silica. Background technique [0002] As we all know, ammonium polyphosphate (APP) is an intumescent environmentally friendly inorganic flame retardant with phosphorus and nitrogen as the main components. It has good properties such as low toxicity, low smoke, and high-efficiency flame retardancy. Fiber products have a wide range of applications. However, since ammonium polyphosphate is an inorganic material, and the application occasions are generally organic polymers, in addition, ammonium polyphosphate has a certain solubility in water, and it will also undergo hydrolysis, which causes many shortcomings in use, such as : Poor compatibility with certain materials, such as penetration, migration, moisture absorption, etc.; reduce the strength and heat resistance of flame-retardant products. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/00C09C3/00C09C3/06C09C3/08C09K21/14C01B33/12
Inventor 方孝汉赵新良
Owner 浙江富锦新材料有限公司
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