Preparation method of aluminum phosphite

A technology of aluminum phosphite and phosphorous acid, applied in the field of flame retardant, can solve the problems of inability to adapt to large-scale industrial production, long production time, damage to equipment, etc., and achieve the effects of low cost, high production efficiency and simple process

Inactive Publication Date: 2020-09-15
SHENZHEN RUN SUN CHEM TECH
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Problems solved by technology

However, this method needs to place the reactant in a high-pressure reactor first, and then put it into a constant temperature drying oven to crystallize for several days. The production time is too long, and it cannot meet the needs of large-scale industrial production, and it is easy to introduce organic templates into the product. , which has adverse effects when applied to flame retardant
[0006] In addition, the prior art also has a technical scheme of placing aluminum hydroxide in a kneader, adding phosphorous acid in batches and heating at 120 to 220°C for 2 hours to react to form a mixture of aluminum phosphite and aluminum hydrogen phosphite. In actual production, the scheme is likely to cause the solidification of the material liquid in the stirring and damage the equipment

Method used

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preparation example Construction

[0035] see figure 1 , the invention provides a kind of preparation method of aluminum phosphite, comprises the steps:

[0036] Step S1, providing aluminum hydroxide or pseudo-boehmite powder, and drying the aluminum hydroxide or pseudo-boehmite powder.

[0037] Specifically, the step S1 specifically includes: drying the aluminum hydroxide or pseudo-boehmite powder in an oven at 110-130° C. for 4-8 hours.

[0038] Further, in the step S1, the moisture content of the dried aluminum hydroxide or pseudo-boehmite powder is controlled at 0.5%-1%.

[0039] Step S2, providing solid phosphorous acid, adding the solid phosphorous acid into a preheated kneading mixer and heating and stirring to obtain liquid phosphorous acid.

[0040] Specifically, the step S2 specifically includes: adding the solid phosphorous acid into a preheated kneading mixer, heating and stirring to melt the solid phosphorous acid, continuing to heat and stir to raise the temperature to 100-120°C, and Stirring w...

Embodiment 1

[0058] Weigh 1600g of aluminum hydroxide and place it in an oven at 180° C. for drying for 6 hours. The moisture content of aluminum hydroxide is 0.8%, and it is ready for use after cooling.

[0059] Weigh 2600g of solid phosphorous acid into the preheated kneading mixer, heat and stir to melt the phosphorous acid, continue stirring to raise the temperature to 130°C, and pass nitrogen protection during the heating and stirring process to prevent oxidation.

[0060] Slowly add the dried aluminum hydroxide into phosphorous acid in batches, and heat to 150°C while stirring. After 3 hours of reaction, after obtaining a powdery product, raise the temperature to 200°C and continue stirring for 2 hours. After the reaction is complete, To generate powdered aluminum phosphite, the stirring speed needs to be controlled in a slow-fast-slow rhythm during the feeding process.

[0061] The aluminum phosphite powder formed by the reaction was slowly stirred and cooled to room temperature.

...

Embodiment 2

[0064] Weigh 1200 g of pseudo-boehmite powder and place it in an oven at 120° C. for 7 hours to dry. The moisture content of the pseudo-boehmite powder is 0.7%, and it is cooled for later use.

[0065] Weigh 2000g of solid phosphorous acid into the kneading mixer, heat and stir to melt the phosphorous acid, continue to stir and raise the temperature to 130°C, and pass nitrogen protection during the heating and stirring process to prevent oxidation.

[0066] Slowly add the dried pseudo-boehmite powder into phosphorous acid in batches, heat to 140°C while stirring, and react for 4 hours. After obtaining the powdery product, raise the temperature to 185°C and continue to stir and react for 3 hours. After completion, powdered aluminum phosphite is generated, and the stirring speed needs to be controlled in a slow-fast-slow rhythm during the feeding process.

[0067] The aluminum phosphite powder formed by the reaction was slowly stirred and cooled to room temperature.

[0068] Pu...

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Abstract

The invention provides a preparation method of aluminum phosphite. The method comprises the following steps of: providing aluminum hydroxide or pseudo-boehmite powder, and drying the aluminum hydroxide or pseudo-boehmite powder; providing solid phosphorous acid, adding the solid phosphorous acid into a preheated kneading stirrer, heating and stirring to obtain liquid phosphorous acid; and adding the dried aluminum hydroxide or pseudo-boehmite powder into liquid phosphorous acid, heating and stirring to obtain aluminum phosphite. The method is simple in process, low in cost, high in productionefficiency and good in environmental protection performance.

Description

technical field [0001] The invention relates to the technical field of flame retardancy, in particular to a preparation method of aluminum phosphite. Background technique [0002] With the development of the economy, the application range and usage of new materials are increasing, and the application of polymer materials is becoming more and more widely. important. [0003] Phosphorus-based flame retardants have low smoke generation, and their development and application have become a hot spot in the flame retardant industry in recent years. Phosphorus-based flame retardants are divided into inorganic and organic phosphorus-based flame retardants. Inorganic phosphorus-based flame retardants have good thermal stability, low smoke and halogen-free, non-toxic, non-corrosive, non-volatile and non-precipitating during storage, and raw material sources The advantages of abundant and low price have occupied more than half of the flame retardant market, ranking first among flame r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/163
CPCC01B25/163C01P2002/72
Inventor 刘晓芳帅和平葛英霞杨红司徒白雪
Owner SHENZHEN RUN SUN CHEM TECH
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