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Expansible fire retardant having double-layer core-shell structure, and preparation method and application thereof

A technology of intumescent flame retardant and core-shell structure, which is applied in the field of materials, can solve the problems of poor water resistance and compatibility, restrict the comprehensive performance of intumescent flame retardant composite materials, and achieve the effect of good compatibility

Inactive Publication Date: 2012-04-11
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, microencapsulated flame retardants only contain acid source (APP) and gas source (MF). To achieve a certain flame retardant performance, they must be compounded with carbon sources (such as pentaerythritol)
However, the traditional carbon sources are mostly alcohol compounds, which have poor water resistance and compatibility, and the "short plate effect" seriously restricts the further improvement of the comprehensive performance of intumescent flame retardant composites.
Therefore, the flame retardancy and water resistance of the core-shell flame retardant with melamine resin as the capsule material need to be further improved.

Method used

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  • Expansible fire retardant having double-layer core-shell structure, and preparation method and application thereof
  • Expansible fire retardant having double-layer core-shell structure, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) The preparation of MF prepolymer aqueous solution: add 50ml distilled water in the there-necked flask, 10g melamine, 19 grams of formaldehyde aqueous solution of mass percent 37%, adjustment system pH is 8-9 (0.01 gram Na 2 CO 3 ), stirred and heated up to 80°C, kept warm for half an hour, and then the system was fixed to 100ml with distilled water for use, which was the aqueous solution of melamine-formaldehyde (MF) prepolymer, in which the amount of melamine-formaldehyde prepolymer was 17.03 .

[0038] (2) Preparation of double-layer core-shell structure flame retardant: Add 30 grams of ammonium polyphosphate (APP) into a three-necked flask filled with 80ml of ethanol and stir fully, heat up to 80°C, add 7 grams of epoxy resin (E- 44), until the dispersion is complete, then add the modified aliphatic curing agent-ethanol solution dropwise within 30 minutes (obtained by dissolving 2.7 grams of modified aliphatic curing agent (WK6683, Guangdong Huishun Chemical Co....

Embodiment 2

[0043] (1) The preparation of MF prepolymer aqueous solution: add 50ml distilled water in the there-necked flask, 10g melamine, 19 grams of formaldehyde aqueous solution of mass percent 37%, adjustment system pH is 8-9 (0.01 gram Na 2 CO 3 ), stirring and heating up to 80°C, heat preservation reaction for half an hour, and then use distilled water to make the system 100ml for use, which is a melamine-formaldehyde (MF) prepolymer aqueous solution, wherein the amount of melamine-formaldehyde prepolymer is 17.03g .

[0044] (2) Preparation of double-layer core-shell structure flame retardant: Add 20 grams of ammonium polyphosphate (APP) into a three-necked flask filled with 80ml of ethanol and stir fully, heat up to 80°C, add 7 grams of epoxy resin (E- 44), until the dispersion is complete, then drop the modified aliphatic curing agent-ethanol solution within 30 minutes (dissolve 3.5 grams of modified alicyclic curing agent (1618, Guangzhou Xiupo Chemical Co., Ltd.) in 20ml etha...

Embodiment 3

[0047] (1) Preparation of MF prepolymer aqueous solution: add 50ml of distilled water, 10g of melamine, 19 grams of 37% formaldehyde solution by mass in a three-necked flask, adjust the pH of the system to be 8-9 (0.02 grams of potassium carbonate), stir and heat up to 80 ℃, heat preservation reaction for half an hour, and then use distilled water to prepare the system to 100ml for use, which is a melamine-formaldehyde (MF) prepolymer aqueous solution, wherein the amount of melamine-formaldehyde prepolymer is 17.03g.

[0048] (2) Preparation of double-layer core-shell structure flame retardant: Add 30 grams of ammonium polyphosphate (APP) into a three-necked flask filled with 80ml xylene and stir fully, heat up to 80°C, add 7 grams of epoxy resin (E -44), until the dispersion is complete, then drop m-phenylenediamine-ethanol solution (obtained by dissolving 0.83 g of m-phenylenediamine in 20 ml of ethanol) within 30 minutes, keep stirring and condensing to reflux, keep the reac...

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Abstract

The invention discloses an expansible fire retardant having a double-layer core-shell structure, and a preparation method and application thereof. In the fire retardant, ammonium polyphosphate is used as a capsule core, and the capsule material sequentially comprises an epoxy resin layer and a melamine-formaldehyde resin layer from inside to outside. The preparation method comprises the following steps: mixing melamine and a 37% (mass percent) formaldehyde water solution, and dissolving in water to obtain a reaction system; regulating the pH value to 8-9, stirring while heating up to 60-95 DEG C, and reacting while keeping the temperature to obtain a melamine-formaldehyde prepolymer water solution; suspending ammonium polyphosphate powder particles in dispersant, adding epoxy resin and curing agent, and reacting while stirring; adding the melamine-formaldehyde prepolymer water solution and hardening agent, and reacting while stirring; and carrying out vacuum filtration, washing, and drying to obtain the expansible fire retardant having a double-layer core-shell structure. Since the fire retardant has the double-layer core-shell structure, the capsule material can not be extruded and broken easily in the processing procedure of the composite material, thereby avoiding the loss of the capsule core; and the fire retardant has better compatibility, fire retardance and water resistance.

Description

technical field [0001] The invention relates to the field of materials, in particular to a double-layer core-shell structure intumescent flame retardant and its preparation method and application. Background technique [0002] With the increasing application of polymers in modern life, polymer flame retardant technology has developed rapidly. It has experienced the development process from halogen-based flame retardant to halogen-free flame retardant. The flame retardant system has been continuously enriched and perfected. The flame retardant system has become a hot spot in flame retardant research due to its advantages of no halogen, low smoke, low toxicity, anti-melt dripping and no corrosive gas generation. [0003] The intumescent flame retardant system is a flame retardant system with C, N, and P as the core components, and is mainly composed of three parts: acid source, carbon source, and gas source. Among them, the acid source generates acid when it is burned, and ac...

Claims

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Application Information

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IPC IPC(8): C09K21/04B01J13/02C08K9/10C08K3/32C08L23/12
Inventor 吴昆吕满庚胡文光练锦添
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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