Modification method of halogen-free intumescent flame retardant and application of modified halogen-free intumescent flame retardant in flame-retardant polypropylene

An intumescent flame retardant and modification technology, which is applied in the field of flame retardant materials, can solve problems such as poor compatibility and poor mechanical properties, and achieve the effects of low water solubility, low cost and high yield

Active Publication Date: 2012-10-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of IFR's moisture absorption, poor compatibility and poor mechanical properties, to propose a modification method of the halogen-free intumescent flame retardant and the modified halogen-free intumescent flame retardant in flame retardant Applications in Polypropylene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for modifying a halogen-free intumescent flame retardant, which includes an acid source, a carbon source, an alkyl ester synergist and a catalyst; based on the total mass of the halogen-free intumescent flame retardant, The mass content of each part is 65% of acid source, 30.4% of carbon source, 0.4% of alkyl ester synergist, and 4.2% of catalyst;

[0028] Wherein, the acid source is type II ammonium polyphosphate APP-JLS; the carbon source is dipentaerythritol (DPER); the alkyl ester synergist is dialkyl carbonate; the catalyst is melamine; the steps of the method include:

[0029] 1) Bake 325g type II ammonium polyphosphate and 152g dipentaerythritol in an oven at 110°C for 2 hours; then compound with 2g dialkyl carbonate and 21g melamine to obtain IFR-1;

[0030] 2) Dissolve 15g of vinyltrimethoxysilane (3% of the mass of the flame retardant) in absolute ethanol, add an appropriate amount of distilled water and a small amount of acetic acid to obtain a modif...

Embodiment 2

[0039] Based on the total mass of the halogen-free intumescent flame retardant, the mass content of each part is 71% of the acid source, 22.4% of the carbon source, 0.4% of the alkyl ester synergist, and 6.2% of the catalyst;

[0040]Wherein, the acid source is type II ammonium polyphosphate APP-JLS; the carbon source is dipentaerythritol (DPER); the alkyl ester synergist is bisphenol A diphosphite alkyl ester; the catalyst is zinc borate; the steps of the method include:

[0041] 1) Bake 355g type II ammonium polyphosphate and 112g dipentaerythritol in an oven at 80°C for 6 hours; then compound with 2g bisphenol A diphosphite alkyl ester and 31g zinc borate to obtain IFR-2;

[0042] 2) Dissolve 25 g of pyrophosphate-type monoalkoxy titanate (5% of the mass of the flame retardant) in absolute ethanol, add an appropriate amount of distilled water and a small amount of acetic acid to obtain a modifier solution. The mass ratio of modifying agent to absolute ethanol and distilled...

Embodiment 3

[0046] Based on the total mass of the halogen-free intumescent flame retardant, the mass content of each part is 66% of the acid source, 29.5% of the carbon source, 0.5% of the alkyl ester synergist, and 4% of the catalyst;

[0047] Wherein, the acid source is type II ammonium polyphosphate APP-JLS; the carbon source is tripentaerythritol (TPER); the alkyl ester synergist is dialkyl carbonate; the catalyst is magnesium silicate; the steps of the method include:

[0048] 1) Bake 330g type II ammonium polyphosphate and 148g tripentaerythritol in an oven at 100°C for 6 hours; then compound with 2.5g dialkyl carbonate and 20g magnesium silicate to obtain IFR-3;

[0049] 2) Dissolve 15 g of vinyltriethoxysilane (3% of the mass of the flame retardant) in absolute ethanol, add an appropriate amount of distilled water and a small amount of acetic acid to obtain a modifier solution. The mass ratio of modifying agent to absolute ethanol and distilled water is 1: 50: 30, and acetic acid ...

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Abstract

The invention relates to a modification method of a halogen-free intumescent flame retardant, and application of the modified halogen-free intumescent flame retardant in flame-retardant polypropylene, which belong to the technical field of flame retardant materials. The modification method comprises the steps of: drying ammonium polyphosphate and a carbon source in a dryer, and compounding the ammonium polyphosphate and the carbon source with alkyl ester synergist and catalysts to obtain the IFR (intumescent flame retardant); dissolving modifying agent into dispersing agent, and adding water and acid in the modifying agent to obtain modifying agent solution; and adding the IFR in a flask, then adding the modifying agent solution in the flask, agitating and heating the mixture, performing decompression and suction filtration on the mixture, drying the mixture after removing the dispersing agent, and then crashing the mixture to obtain IFR powder with surface modified. The modification method has the advantages of mild preparation condition, easiness in control, high repeatability, high productivity and low cost; and the solubility in water of the prepared modified intumescent flame retardant is reduced, the thermal stability of the retardant is improved, and the quantity of carbon residues is increased. According to the invention, when the modified IFR is applied to the polypropylene flame-retardant system, the compatibility is imporoved, and the mechanical property, flame retardant property and the like of the flame-retardant polypropylene can be effectively improved.

Description

technical field [0001] The invention relates to a modification method of a halogen-free intumescent flame retardant and the application of the modified halogen-free intumescent flame retardant in flame-retardant polypropylene, in particular to a method for surface modification of the intumescent flame retardant as a whole The method and the application of the modified flame retardant in flame-retardant polypropylene; after the overall surface modification of the intumescent flame retardant, the water solubility decreases, and the thermal stability and the amount of carbon residue after thermal weight loss are improved. At the same time, adding the modified flame retardant to polypropylene can improve the compatibility of the system, improve the mechanical properties and flame retardancy of the flame retardant polypropylene, and belong to the technical field of flame retardant materials. Background technique [0002] Halogen-free intumescent flame retardant (IFR) was first in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/04C08K9/06C08K3/32C08K5/053C08K5/06C08K5/109C08K5/526C08L23/12
CPCY02P20/52
Inventor 李定华秦兆鲁杨荣杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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