Expanding fire retardant prepared from bauxite dressing tailings and preparation method thereof

An intumescent flame retardant and bauxite technology, applied in the direction of fireproof coatings, etc., can solve the problems of low flame retardant efficiency of Al-P-N composite flame retardants, poor compatibility of polymers, etc., and achieve low cost and good Compatibility, the effect of simple preparation process

Inactive Publication Date: 2008-08-13
CENT SOUTH UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to utilize bauxite beneficiation tailings efficiently and on a large scale to prepare intumescent flame retardants, and to further solve the problem of Al-P-N composite flame retardants when using bauxite beneficiation tailings to prepare Al-P-N composite flame retardants. Due to the problems of low efficiency and poor compatibility with polymers, an intumescent flame retardant with high flame retardancy and good compatibility with polymers was prepared

Method used

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  • Expanding fire retardant prepared from bauxite dressing tailings and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] 1. Add 500 parts of ore dressing tailings, 50 parts of phosphoric acid solution (85%), and 100 parts of water into a ceramic ball milling tank, mill at 200 r / m for 5 hours, add 55 parts of melamine, continue ball milling for 2 hours, and dry at 120 ° C. Calcined at 220°C to obtain ore dressing tailings powder coated with Al-P-N compound;

[0019] 2. Add 40 parts of melamine, 100 parts of formaldehyde aqueous solution (37%), 200 parts of methanol aqueous solution (12%) and 1000 parts of water into a reactor equipped with a stirring, heating and reflux device, and reflux at 80°C until it becomes transparent After the homogeneous prepolymer, add 200 parts of mineral processing tailings powder coated with Al-P-N compound, reflux at 60°C for 3 hours, cool and filter, and obtain modified melamine-formaldehyde resin-coated mineral processing tailings;

[0020] 3. Add 100 parts of resin-coated ore dressing tailings, 15 parts of phosphoric acid solution (85%), and 500 parts of w...

Embodiment 2

[0023] Add 500 parts of ore dressing tailings, 70 parts of ammonium phosphate, and 100 parts of water into a porcelain ball mill jar, mill at 200 r / m for 5 hours, add 55 parts of melamine, continue ball milling for 2 hours, dry at 120°C, and calcined at 260°C to obtain Al -P-N compound-coated ore dressing tailings powder; the rest of the steps are carried out as in Example 1.

[0024] The performance of the fire retardant obtained in the embodiment is evaluated according to the following methods:

[0025] 1. Flame-retardant polypropylene sample preparation

[0026] After melting 100 parts of polypropylene on a twin-roller plasticizer, add 50 parts of the intumescent flame retardant prepared in Example 1, knead at 170°C for 20 minutes, then mold on a hot press at 180°C, and age at 60°C for 7 hours , sample with a universal prototype machine.

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Abstract

The preparation steps of swelling fire retardant by covering mill run and gangue of bauxite by resin is showed as follows: reacting mill run and gangue of bauxite orderly with phosphorous and nitrogenous materials in milling and thinning process, then drying, calcining and covering a Al-P-N composite on the surface of the mill run and the gangue grain; then covering the covered gangue orderly with resin prepolymer and phosphate to obtain resin covered mill run and gangue of bauxite; mixing and reacting the product with styrene, diethylene phenyl, methanol or butanol, filtering, washing, drying the final product to obtain the swelling fire retardant. The invention accomplishes the utilization of industrial castoff of mill run and gangue of bauxite with simple technics and low cost, which is prone to industrialization. The prepared fire retardant has a swelling property with a thermal decomposition temperature more than or equal to 230 deg C, having greater compatibility with high polymer.The swelling property can be adjusted by controlling the covering times according to application requests.

Description

technical field [0001] The invention relates to an Al-P-N intumescent flame retardant, in particular to preparing the Al-P-N intumescent flame retardant by using bauxite dressing tailings. Background technique [0002] With the development of society, various high polymers are increasingly used in construction, textile, transportation, electronic appliances and other fields. While these substances promote social civilization, they also bring many fire hazards due to their flammability. To prevent and control fire, technically based on the interaction principle of the three elements of combustion (combustibles, air, temperature), currently the main measures are to add flame retardants to high polymers (main substances). Flame retardants in polymers mainly prevent or delay the burning or burning speed of polymers by decomposing and absorbing heat, releasing non-combustible gases, forming heat and oxygen insulation layers, and capturing active free radicals generated when poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K21/14C09K21/04
Inventor 胡岳华卢清华杨华明刘祥民张吉龙孟杰
Owner CENT SOUTH UNIV
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