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A kind of preparation method of low acid value, low viscosity crystalline type II ammonium polyphosphate

A technology of ammonium polyphosphate and low viscosity, which is applied in the direction of chemical instruments and methods, phosphorus compounds, coatings, etc. It can solve the problems of low initial viscosity, unstable viscosity, and performance decline, and achieve low viscosity, low acid value, highly operable effect

Active Publication Date: 2020-11-06
HANGZHOU JLS FLAME RETARDANTS CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the problems of unstable viscosity and performance decline in the preparation of crystalline type II ammonium polyphosphate as the storage time increases, the present invention proposes a method for preparing crystalline type II ammonium polyphosphate with low acid value and low viscosity. Low acid value, low viscosity ammonium polyphosphate has the characteristics of stable pH value, small acid value, low initial viscosity and stable storage viscosity in water-based coatings.

Method used

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  • A kind of preparation method of low acid value, low viscosity crystalline type II ammonium polyphosphate
  • A kind of preparation method of low acid value, low viscosity crystalline type II ammonium polyphosphate

Examples

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Embodiment 1

[0032] (1), drop into the reactant phosphorus pentoxide of equimolar ratio and diammonium hydrogen phosphate in the kneader, after stirring evenly, heat up and pass ammonia, with every 100 kilograms of reactants, pass ammonia amount N 1 3m 3 / h, reaction T at 200°C 1 = After 5 hours, add melamine M 1 It is 0.2% of the total mass of phosphorus pentoxide and diammonium hydrogen phosphate, and the ammonia flow is continued, and the amount of ammonia flow is N 2 0.5m 3 / h Reaction T at 200°C 2 =1 hour, after pulverizing, ammonium polyphosphate pre-product was obtained;

[0033] (2), add 100 kg of ammonium polyphosphate pre-product into the kneader, under the stirring condition of 60 revolutions per minute, at 260 °C, stir the ammonia, the amount of ammonia is N 3 1m 3 / h, adding 0.02% of the total mass of phosphorus pentoxide and diammonium hydrogen phosphate after the material temperature reaches 160°C is nano-silica with a particle size of 5nm, and continues the reaction T...

Embodiment 2

[0035] The difference between this embodiment and embodiment 1 is: in step 1., the amount of ammonia flow N 1 4m 3 / h,T 1 = 4 hours, on the basis of every 100 kilograms of reactants, add melamine M 1 It is 0.05% of the total mass of phosphorus pentoxide and diammonium hydrogen phosphate, and all the other are with embodiment 1.

Embodiment 3

[0037] The difference between this embodiment and embodiment 1 is: in step 1., the amount of ammonia flow N 1 3m 3 / h,T 1 = 3 hours on the basis of every 100 kilograms of reactants, add melamine M 1It is 0.5% of the total mass of phosphorus pentoxide and diammonium hydrogen phosphate, the melamine M of step ② 2 It is 3% of the total mass of the ammonium polyphosphate pre-product, and all the other are the same as in Example 1.

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Abstract

The invention relates to the technical field of APP (ammonium polyphosphate) preparation and provides a preparation method of crystal II-type APP with low acid value and low viscosity in order to solve the problems of unstable viscosity, performance reduction and the like with increase of storage time of current preparation of crystal II-type APP. According to the preparation method, a small amount of melamine is added at the earlier stage for promoting crystal transformation, after crystals are smashed at the later stage, nano-silica is added to continuously increase degree of crystallizationII, then melamine is added to reduce the acid value of APP, and prepared APP with low acid value and low viscosity has the characteristics of stable pH value and low acid value as well as low initialviscosity, stable storage viscosity and the like in water-based paint.

Description

Background technique [0001] The invention relates to the technical field of ammonium polyphosphate preparation, in particular to a preparation method of low-acid value, low-viscosity crystalline type II ammonium polyphosphate. Background technique [0002] Ammonium polyphosphate (hereinafter referred to as APP) is an intumescent environmentally friendly inorganic flame retardant with phosphorus and nitrogen as the main components. It can be used as a flame retardant for coatings, plastics, and rubber. good substitutes. However, since APP is an inorganic polymer, there are problems of easy moisture absorption, moisture absorption, and poor compatibility with resins. The crystalline type II APP with a high degree of polymerization is usually synthesized from phosphorus pentoxide and diammonium hydrogen phosphate. The temperature is usually above 1000, and the reaction in the preparation process is violent, which makes the pH value of the product unstable and the acid value hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/40C09D201/00C09D161/28C09D5/18
CPCC01B25/405C01P2004/61C01P2006/90C08K2003/2241C08K2003/323C09D5/18C09D201/00C08L61/28C08K3/22C08K5/053C08K3/32
Inventor 裘雪阳朱峰刘君锭吴伟俊徐玲
Owner HANGZHOU JLS FLAME RETARDANTS CHEM
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