Preparation method for in-situ modified expansion type fire retardant

A technology of intumescent flame retardants and in-situ modifiers, which is applied in the field of preparation of chemical additives, can solve the problems of slightly acidic, and the comprehensive performance of flame retardants needs to be further improved, and achieve low smoke density and reduce additives The effect of increasing the flame retardant performance

Inactive Publication Date: 2012-04-18
HEBEI UNIVERSITY
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  • Abstract
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AI Technical Summary

Problems solved by technology

The disadvantage is that the preparation system is slightly acidic, and the comprehensive performance of the flame retardant needs to be further improved

Method used

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  • Preparation method for in-situ modified expansion type fire retardant
  • Preparation method for in-situ modified expansion type fire retardant
  • Preparation method for in-situ modified expansion type fire retardant

Examples

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Effect test

Embodiment 1～46

[0024] The specific preparation method is as follows:

[0025] (a) Preparation of acid phosphate: in a 500ml three-necked flask, add 7.2 milliliters of 85% phosphoric acid, under constant stirring, control the temperature at 110°C, slowly add 184.6g phosphorus pentoxide and 132g pentaerythritol alternately, Raise the temperature to 130°C and keep it warm for 4 hours to obtain a brown-red viscous liquid;

[0026] (b) Preparation of methylolated melamine: in a 250ml three-neck flask, first add 37% formaldehyde solution 60ml, 50ml water, adjust pH=7-9 with 10% NaOH solution, then add 100g melamine, and heat at 70-80°C 40 minutes between reactions;

[0027] (c) Coated ammonium polyphosphate: Disperse 200g of ammonium polyphosphate in 200ml of water at room temperature, and simultaneously add 96.6g of acid phosphate prepared in step (a) and all the methylols prepared in step (b) under stirring melamine, control the pH value between 3-6, heat up to 85°C, and react for 2 hours;

...

Embodiment 46

[0035] Example 46 Beneficial effect verification (taking polypropylene as an example):

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Abstract

The invention discloses a preparation method for an in-situ modified expansion type fire retardant. The method comprises the following steps: (a) preparing acidic phosphate ester; (b) preparing hydroxymethylated melamine; (c) cladding ammonium polyphosphate; (d) based on the amount of solid in step c, adding an in-situ modifier with a mass percent of 0.2 to 6% and carrying out uniform dispersion;(e) carrying out filtration, drying a product obtained after filtration and roasting the product into powder so as to obtain a finished product of in-situ modified microcapsule cladded ammonium polyphosphate. According to the invention, the in-situ modifier has a synergistic flame retardant effect is uniformly dispersed in the whole system of the fire retardant in a form of a stable compound, which enables the problems that a preparation system is acidic and a trace amount of the in-situ modifier is difficult to disperse uniformly to be effectively overcome and flame retardant efficiency of the fire retardant to be substantially improved.

Description

technical field [0001] The invention relates to a preparation method of a chemical auxiliary agent, in particular to a preparation method of an intumescent flame retardant. Background technique: [0002] Intumescent flame retardants are generally composed of three parts: acid source, carbon source and gas source. The acid source is usually an inorganic acid or a compound that can form an inorganic acid after being heated to a certain temperature (such as phosphoric acid, phosphorus oxychloride, ammonium polyphosphate, etc.) etc.); carbon sources usually use polyols with high carbon content (such as pentaerythritol, starch, etc.); gas sources usually use melamine and dicyandiamide compounds with foaming effects. In the method for preparing intumescent flame retardant, its typical formula is ammonium polyphosphate-pentaerythritol-melamine system, but the flame retardant prepared according to the conventional method has problems such as water solubility and migration. In order...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K3/32C08K9/04C08K9/02C08K7/24C08L23/00
Inventor 马志领宋常英范聪然
Owner HEBEI UNIVERSITY
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