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Melamine polyphosphate and application thereof

A technology of melamine polyphosphate and polycyanamide polyphosphate, which is applied in the field of flame retardants, can solve the problems of poor anti-aging effect of flame retardant modified products, limited application scope of melamine polyphosphate, etc., and achieves stable and reliable reaction process. control, excellent anti-aging properties, mild reaction conditions

Inactive Publication Date: 2020-06-16
四川省精细化工研究设计院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are substances such as melamine phosphate that have not completely reacted in the preparation of melamine polyphosphate by this method. When the melamine polyphosphate is compounded with a flame retardant synergist to synergistically flame-retardant PA66 and PBT, the anti-aging effect of the flame-retardant modified product is relatively poor. , limiting the scope of application of melamine polyphosphate

Method used

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  • Melamine polyphosphate and application thereof
  • Melamine polyphosphate and application thereof

Examples

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example 1

[0031] A preparation method of high thermal stability melamine polyphosphate, comprising the following steps:

[0032] (1) Weigh melamine, sodium pyrophosphate and hydrochloric acid according to the molar ratio of 2:1:4, and add the enamel reaction kettle filled with distilled water under the condition of stirring. The quality of distilled water in the reaction kettle accounts for 60% of the total amount of raw materials added. %, react the mixed liquid at 85°C for 2.0h, centrifuge, wash, and dry at 100°C for 48h to obtain the intermediate;

[0033] (2) Fully mix the intermediate in step (1) with urea at a weight ratio of 1:0.05, heat-treat at 170°C for 1.0 hour, then heat-treat at 340°C for 2.0 hours, cool and pulverize to obtain melamine polyphosphate.

example 2

[0035] (1) Weigh melamine, sodium pyrophosphate and nitric acid according to the molar ratio of 2:1:4, and add them into the enamel reaction kettle filled with distilled water under stirring conditions. The quality of distilled water in the reaction kettle accounts for 65% of the total amount of raw materials added. %, react the mixed liquid at 90°C for 2.0h, centrifuge, wash, and dry at 100°C for 48h to obtain the intermediate;

[0036] (2) Fully mix the intermediate in step (1) with ammonium carbonate at a weight ratio of 1:0.03, heat-treat at 180°C for 1.5 hours, then heat-treat at 330°C for 2.0 hours, cool and pulverize to obtain melamine polyphosphate.

example 3

[0038] (1) Weigh melamine, sodium pyrophosphate and hydrochloric acid according to the molar ratio of 2:1:4, and add the enamel reaction kettle filled with distilled water under the condition of stirring. The quality of distilled water in the reaction kettle accounts for 70% of the total amount of raw materials added. %, react the mixed liquid at 80°C for 2.0h, centrifuge, wash, and dry at 100°C for 48h to obtain the intermediate;

[0039] (2) Fully mix the intermediate in step (1) with ammonium bicarbonate at a weight ratio of 1:0.05, heat-treat at 180°C for 1.0 hour, then heat-treat at 320°C for 2.5 hours, cool and pulverize to obtain melamine polyphosphate.

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Abstract

The invention discloses melamine polyphosphate. The melamine polyphosphate is prepared by mixing dimelamine pyrophosphate and an ammonia source and then carrying out high-temperature heat treatment. The invention also discloses a scheme for preparing a dimelamine pyrophosphate intermediate from melamine, sodium pyrophosphate and inorganic acid, and drying and roasting the intermediate to obtain melamine polyphosphate. The invention also discloses an application of the melamine polyphosphate in flame-retardant modified products. The melamine polyphosphate has the characteristics of high thermalstability, low water solubility and excellent flame retardance, and a flame-retardant modified product prepared by applying the melamine polyphosphate has excellent ageing resistance; the productionprocess of the melamine polyphosphate is simple in step, mild in reaction condition, stable and controllable in reaction process, low in energy consumption and small in environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of flame retardants, in particular to a melamine polyphosphate and an application thereof. Background technique [0002] With the wide application of polymer materials in all aspects of life, the flammability of polymer materials has gradually been exposed and caused national economic losses. Flame retardants have received more and more attention, especially environmentally friendly halogen-free flame retardants. Melamine polyphosphate is an environmentally friendly, high-efficiency nitrogen-phosphorus flame retardant, suitable for engineering plastics such as PA66 and PBT with high processing temperature. [0003] At present, the main method for preparing melamine polyphosphate is a two-step method. Firstly, melamine and phosphoric acid are prepared according to a certain ratio to obtain a melamine phosphate intermediate, and then the melamine polyphosphate is obtained through high-temperature heat treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/54C08K5/3492C08L67/02
CPCC07D251/54C08K5/34928C08L2201/02C08L67/02
Inventor 黄维光马祥伟郎俊钟尧魏剑波
Owner 四川省精细化工研究设计院
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