Method for making ammonium polyphosphate clad by microcapsules

A technology of coating ammonium polyphosphate and ammonium polyphosphate, applied in the direction of microcapsule preparation, microsphere preparation, etc., can solve the problems of long-term contact with water, environmental pollution, and reduced yield of coated APP, etc.

Active Publication Date: 2004-03-10
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method solves the shortcomings of agglomeration on the wall of the reactor and obvious change in particle size of coated APP, some APP will be hydrolyzed during the coating process, resulting in a decrease in the yield of coated APP.
In addition, the free formaldehyde content in the coated product reaches 5.0-8.0mg/100g, so when used as a flame retardant, there is concern

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Example 1

[0037] In a reactor equipped with a stirring and reflux device, add 180ml of ethanol and 100g of APP, heat to 80°C under stirring, then add 28g of melamine-formaldehyde prepolymer, and then add ammonium chloride of 2.0% by weight of the prepolymer. Stir and react for about 30 minutes to harden the resin. Then lower the temperature of the kettle to about 50°C, add 1.0% urea equivalent to the weight of the solid reactant, continue to stir and react for about 30 minutes, cool, filter, and dry the filter cake at 90°C and 30mmHg to obtain good free flow. The coated APP is 115.5g.

Example Embodiment

[0038] Example 2

[0039] In a reactor equipped with a stirring and reflux device, add 180ml of ethanol and 100g of APP, and add 35g of melamine-formaldehyde prepolymer at a temperature of 80°C, and add 3.0% ammonium chloride by weight of the prepolymer, stir, React for 60 minutes to harden the resin. Then lower the temperature of the kettle to about 50°C, then add 3.0% urea equivalent to the weight of the solid reactant, continue to stir and react for about 20 minutes, cool and filter, and dry the filter cake at 90°C and 30mmHg to obtain good fluidity. White coated APP 112.6g.

Example Embodiment

[0040] Example 3

[0041]The feeding and operation are carried out according to Example 1, but the addition amount of prepolymer is 17g, the addition amount of ammonium chloride is 2% of the weight of the prepolymer, and the addition amount of urea is 1% of the weight of the solid reactant, and the reaction is complete. After that, it was cooled and filtered, and the filter cake was dried at 90° C. and 30 mmHg to obtain 105.8 g of white coated APP with good free-flowing properties.

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PUM

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Abstract

A microsoftgel coated ammonium polyphosphate is prepared through suspending the ammonium polyphosphate particles in disperser, adding melamine, formaldehyde and hardening agent at 60-150 deg.C, stirring while reaction, adding formaldehyde capture, stirring while reacting at 30-60 deg.C for 10-30 min, filtering and drying. It can be used as flame-retarding agent.

Description

technical field [0001] The invention relates to the technology of using ammonium polyphosphate as the core material and coating with microcapsules, especially the coating technology of using melamine-formaldehyde resin as the capsule wall material. Background technique [0002] Ammonium polyphosphate (ammonium polyphosphate, hereinafter referred to as APP) has the following general structural formula: [0003] (NH 4 ) n+2 P n o 3n+1 (where n is an integer from 20 to 800) is usually a fluid powdery substance, close to neutral, good chemical stability, safe to use, and can be mixed with other substances without causing chemical changes; its phosphorus, High nitrogen content can produce P-N synergistic effect, so it is an efficient inorganic flame retardant. [0004] However, since APP is a kind of hydrophilic powder, it will absorb moisture in the air when it is stored in the air, resulting in the aggregation state of APP. 2 o 5 Hydrolysis, moreover, the rate of...

Claims

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Application Information

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IPC IPC(8): B01J13/02C08K9/10C08L75/04C09K21/12C09K21/14
Inventor 单渊复於莉莉陈崇伟刘彦明
Owner SHANGHAI RES INST OF CHEM IND
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