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Method for preparing microcapsule coated ammonium polyphosphate

A technology of coating ammonium polyphosphate and microcapsules, applied in the field of materials, can solve problems such as uneven distribution, agglomeration, and poor compatibility

Inactive Publication Date: 2012-07-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since APP is an inorganic flame retardant, it is easily affected by external environmental factors during use, causing it to agglomerate, causing uneven distribution, and even moving out from the inside of the matrix, making the flame retardant performance difficult to last. , APP has poor compatibility with the polymer system, and while endowing the polymer with flame retardant properties, it tends to reduce other properties of the polymer

Method used

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  • Method for preparing microcapsule coated ammonium polyphosphate
  • Method for preparing microcapsule coated ammonium polyphosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Preparation of MCAPP containing water

[0027] First use H 2 O pre-impregnate the APP to provide conditions for the accumulation of Span 80 / 85 on the surface of the APP.

[0028] In Example 1, the following three mixtures are marked as W 11 , W 12 , W 13 :

[0029] W 11 : "APP Clay" (10g APP + 1g H 2 O).

[0030] W 12 : Span 80 / 85 (Span80:Span85=3:2; 5g) is dissolved in toluene (30ml).

[0031] W 13 : MDI (15g) and DBDL (0.78g) are dissolved in toluene (15ml).

[0032] The organic phase W 12 With W containing the core material 11 Stir at high speed for 30 min at room temperature. After APP with water on the surface is wrapped and dispersed by the mixed dispersant, add solution W 13 , Under the condition of high-speed stirring (2000r / min), the temperature is raised to 63°C to polymerize the mixed dispersant film wrapped on its surface, and the reaction is continued for 4h. After the reaction, the microcapsule slurry was gently poured out and washed with toluene and w...

Embodiment 2

[0034] Example 2: Preparation of MCAPP without water

[0035] In Example 2, the following 3 mixtures are marked as W 21 , W 22 , W 23 :

[0036] W 21 : APP paste (10g APP).

[0037] W 22 : Span 80 / 85 (Span80:Span85=3:2; 5g) is dissolved in toluene (30ml).

[0038] W 23 : MDI (2g) and DBDL (0.1g) are dissolved in toluene (15ml).

[0039] First use a thermostatic magnetic stirrer to remove the organic phase W 22 With W containing the core material 21 Stir at high speed for 30 min at room temperature. After APP coated with mixed dispersant on the surface is dispersed in toluene, add solution W 23 , Under the condition of high-speed stirring (2000r / min), the temperature is raised to 63°C to cause polymerization reaction of the mixed dispersant film wrapped on the APP surface, and the reaction continues for 4h. After the reaction, the microcapsule slurry was gently poured out and washed with toluene and water respectively to remove unreacted MDI and uncoated APP. The microcapsules after ...

Embodiment 3

[0041] Example 3: Preparation of MCAPP using acetone as organic solvent

[0042] Same as Example 1, first use H 2 O pre-soak APP to provide conditions for the aggregation of the mixed dispersant on the surface of APP.

[0043] In Example 3, the following three mixtures are marked as W 31 , W 32 , W 33 ,:

[0044] W 31 : "APP Clay" (10g APP + 1g H 2 O).

[0045] W 32 : Span 80 / 85 (Span80:Span85=3:2; 5g) is dissolved in acetone (30ml).

[0046] W 33 : MDI (15g) and DBDL (0.78g) are dissolved in acetone (15ml).

[0047] The organic phase W 32 With W containing the core material 31 Stir at high speed for 30 min at room temperature. After APP with water on the surface is wrapped and dispersed by the mixed dispersant, add solution W 33 , Under the condition of high-speed stirring (2000r / min), the temperature is raised to 54°C to polymerize the mixed dispersant film wrapped on the surface, and the reaction is continued for 4h. After the reaction, the microcapsule slurry was gently poured ou...

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Abstract

The invention belongs to the technical field of materials, and in particular relates to a method for preparing microcapsule coated ammonium polyphosphate (MCAPP). The method comprises the following steps of: uniformly dispersing APP containing water or not containing water in an organic solvent by utilizing a mixed dispersing agent; adding diisocyanate substances and a catalyst, and performing polymerization with hydroxy on the dispersing agent; and washing with water and the organic solvent, filtering, and drying to obtain the microcapsulated APP. Compared with APP, the microcapsule coated ammonium polyphosphate has the advantages of obviously improving water resistance and obviously improving a moisture absorption agglomeration phenomenon; and the MCAPP has good compatibility with a polymer substrate and good dispersability in the polymer substrate, so the excellent flame retardancy of the APP is fully achieved. The method successfully solves the problem that the flame retardancy ofan inorganic flame retardant in the polymer substrate cannot be last, and realizes the expansion of the field of polymer flame retardancy modification.

Description

Technical field [0001] The invention belongs to the technical field of materials, and specifically relates to a preparation method of microcapsule ammonium polyphosphate (APP). Background technique [0002] With the increasing application of polymer materials, flame retardants, as their most effective flame retardant modified additives, have developed into a wide variety of systems with diverse properties. According to the existence form of flame retardant in the polymer system, it can be divided into two types: additive type and reactive type. Among them, the additive flame retardant is simply dispersed in the matrix resin, and does not react with the matrix resin and other components in the process; while the reactive flame retardant often participates in the chemical reaction in the form of reactive monomer or crosslinking agent, and Finally, it exists in the polymer system in the form of structural units. [0003] APP is a phosphorus-nitrogen-based intumescent inorganic flame...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/14C08G18/32C08L75/04C08K9/10C09C1/00C09C3/10
Inventor 刘琳朱云卿
Owner TONGJI UNIV
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