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
CN101760049AActive Publication Date: 2010-06-30浙江富锦新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
浙江富锦新材料有限公司
Publication Date
2010-06-30

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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