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Method for improving water resistance of ammonium polyphosphate

A technology of ammonium polyphosphate and water resistance, which is applied in chemical instruments and methods, inorganic pigment treatment, dyeing low-molecular organic compound treatment, etc., can solve the problems of poor thermal stability, poor flame retardant durability, high solubility, etc., and achieve Improves water resistance, reduces water solubility, and requires less equipment conditions

Active Publication Date: 2011-01-12
FOSHAN SANSHUI JINGE NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the object of the present invention is to aim at the disadvantages such as large solubility in ammonium polyphosphate water, poor flame retardant durability, poor thermal stability, and the deficiencies existing in the current ammonium polyphosphate modification technology, to provide a method through liquid phase chemistry. The method of effectively improving the water resistance of ammonium polyphosphate by reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Weigh 1260g of melamine, add it into a 10L beaker filled with 2400ml of deionized water, turn on the mechanical stirring, add 1220g of hydrochloric acid (concentration is 36%) after 5min, then heat it up to 50°C within 30min, keep this temperature for 30min to Completely dissolved to obtain melamine hydrochloride aqueous solution.

[0030] Add 1785g of water-soluble ammonium polyphosphate (polymerization degree: 20) into a 10L reaction kettle containing 1780g of water, stir evenly, heat to 50°C, add the above-mentioned melamine hydrochloride solution, heat and raise the temperature to 80°C within 20min ℃, continue stirring at this temperature for 1 hour, stop heating, filter when the temperature drops to room temperature, wash until the filtrate is checked with 2% silver nitrate solution, and there is no white precipitate that is insoluble in dilute nitric acid, and the resulting solid is put into an oven. Dry at 100°C for 24 hours to obtain 2018g white modified ammonium...

Embodiment 2

[0032] Weigh 1260g of melamine, add it into a 10L beaker filled with 2400ml of deionized water, turn on the mechanical stirring, add 1100g of nitric acid (concentration is 69%) after 5min, then heat it up to 50°C within 25min, keep this temperature for 30min to Completely dissolved to obtain melamine nitrate aqueous solution.

[0033] Add 1785g of water-soluble ammonium polyphosphate (polymerization degree: 20) into a 10L reaction kettle filled with 1780g of water, heat to 50°C, add the above-mentioned melamine nitrate aqueous solution, continue heating and raise the temperature to 80°C within 20min, here After continuing to stir for 2 hours at high temperature, stop heating, filter and wash when the temperature drops to room temperature, put the obtained solid in an oven, and dry at 110°C for 24 hours to obtain 2007g of white modified ammonium polyphosphate powder with a solubility of 0.652 g / 100mlH 2 O (25°C).

Embodiment 3

[0035] Weigh 126g of melamine, add it into a 1L beaker filled with 340ml of deionized water, turn on the mechanical stirring, add 122g of hydrochloric acid (concentration is 36%) after 5min, and stir at 30°C for 30min until completely dissolved to obtain melamine hydrochloride aqueous solution.

[0036] Add 1470g of ammonium polyphosphate (polymerization degree 200) into a 10L reaction kettle filled with 4400g of water, stir evenly, heat up, and raise the temperature to 80°C within 30min, add 250g of the above-mentioned melamine hydrochloride solution, and continue at this temperature After stirring for 2 hours, stop heating, filter when the temperature drops to room temperature, wash until the filtrate is checked with 2% silver nitrate solution and no white precipitate insoluble in dilute nitric acid is precipitated, put the obtained solid into an oven, and dry at 120°C for 24 hours. Obtain 1460g white modified ammonium polyphosphate powder, solubility is 0.447g / 100mlH 2 O (...

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Abstract

The invention provides a method for improving the water resistance of ammonium polyphosphate. The method comprises the following steps of: (1) performing a cation exchange reaction on a chain extension crosslinking agent and the ammonium polyphosphate in a water-containing medium, wherein the chain extension crosslinking agent provides bivalent and / or bivalence higher cations for the cation exchange reaction with NH<4+>; and (2) performing solid and liquid separation on a reaction product so as to obtain solid modified ammonium polyphosphate. In the method, the cations of the chain extension crosslinking agent undergoes the cation exchange reaction with the NH<4+> ionized from an ammonium polyphosphate liquid phase, so that chain growth and crosslinking of the ammonium polyphosphate are realized and the aim of reducing the water solubility of the ammonium polyphosphate is fulfilled. Compared with a solid-phase method for modifying the ammonium polyphosphate, the method of the invention has the advantages of mild reaction condition, uniformly controllable quality of the modified ammonium polyphosphate, low requirement on equipment condition, simpleness, easy operation and the like.

Description

technical field [0001] The invention relates to a method for improving the water resistance of ammonium polyphosphate, in particular to a method for improving the water resistance of ammonium polyphosphate through liquid-phase chemical reaction. Background technique [0002] Ammonium polyphosphate (APP) is an inorganic polymer containing nitrogen and phosphorus. Its theoretical phosphorus content is 31.92%, and its theoretical nitrogen content is 14.44%. It has the advantages of efficient flame retardant and high flame retardant performance, and is widely used in the field of flame retardant. Especially in the field of intumescent flame retardants and intumescent flame retardant coatings, ammonium polyphosphate generates strong dehydrating agents such as polyphosphoric acid after being dehydrated by heat, which promotes the dehydration and carbonization of the surface of organic matter, and the non-volatile phosphorus oxide and polyphosphoric acid produced promote The base ...

Claims

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Application Information

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IPC IPC(8): C09C1/00C09C3/06C09C3/08
Inventor 姜宏伟靳晓雨
Owner FOSHAN SANSHUI JINGE NEW MATERIALS CO LTD
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