Expansion type boron-nitrogen-phosphorus compound fire retardant and preparation method thereof

A technology of intumescent flame retardant and compound flame retardant, which is applied in the field of flame retardant preparation, can solve problems such as limited use range and melt droplets, and achieves anti-melt droplet generation, less addition, and high flame retardant efficiency. Effect

Inactive Publication Date: 2019-03-08
南京工业大学连云港工业技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical structure of polypropylene determines that it is extremely flammable. The oxygen index of polypropylene without flame retardant treatment is only 18%, and it is prone to droplet phenomenon when burning, which limits its application range.

Method used

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  • Expansion type boron-nitrogen-phosphorus compound fire retardant and preparation method thereof

Examples

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Effect test

preparation example Construction

[0022] Such as figure 1 , the preparation method of intumescent boron-nitrogen-phosphorous compound flame retardant of the present invention, comprises the following steps:

[0023] (1) Mix intumescent flame retardant and polypropylene in a high-speed mixer according to a certain compounding ratio;

[0024] (2) Use a twin-screw extruder to extrude and granulate to form mixed solid particles;

[0025] (3) Use the injection molding machine to inject solid particles into test specimens, and measure the LOI value and UL-94 value;

[0026] (4) Modify the intumescent flame retardant and repeat steps 1-4;

[0027] (5) Select the best flame retardant formula, and test the physical properties of the modified flame retardant polypropylene.

Embodiment 1

[0029] Weigh ammonium polyphosphate, pentaerythritol, boric acid and melamine according to the mass ratio of 2:1:1:1, mix them with polypropylene in an amount of 30wt%, and mix them evenly in a high-speed mixer. The rotational speed of the twin-screw extruder was set to 400rmp, the outlet temperature was set to 170°C, and the mixed flame retardant material was added to the twin-screw extruder for granulation to form solid mixed granules. The solid pellets were injection molded into test specimens using an injection molding machine.

Embodiment 2

[0030] Example 2: Testing the flame retardancy and mechanical properties of the intumescent boron-nitrogen-phosphorus compound flame retardant.

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Abstract

The invention discloses an expansion type boron-nitrogen-phosphorus compound fire retardant and a preparation method thereof. The method comprises the following steps of (1) sufficiently mixing polypropylene materials and expansion type fire retardants; (2) performing extrusion granulation by a double-screw extrusion machine to form mixed solid particles, thus obtaining the expansion type boron-nitrogen-phosphorus compound fire retardant. By a compounding method, ammonium polyphosphate, pentaerythritol, boracic acid and tripolycyanamide are used as raw materials to obtain the expansion type boron-nitrogen-phosphorus compound fire retardant with the characteristics of small addition quantity, high fire retardant efficiency, good material compatibility, molten drip generation prevention, lowtoxicity, environment protection and the like.

Description

technical field [0001] The invention relates to a preparation method of a flame retardant, in particular to a preparation method of an intumescent boron-nitrogen-phosphorus compound flame retardant. Background technique [0002] At present, more than 80% of domestic flame retardants are halogen flame retardants. Although these flame retardants have good flame retardancy, they will release a lot of smoke and toxic and corrosive gases when they burn, which not only seriously threatens human health, but also It will also pollute the environment. Therefore, the research and development of green and efficient new flame retardants has attracted the attention of the material industry. [0003] Inorganic flame retardants and phosphorus flame retardants are halogen-free, low toxicity, less dosage, high efficiency, and have the characteristics of environmental friendliness during use, but they have poor compatibility with polymers, high addition amounts, and mechanical properties of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K3/32C08K5/053C08K3/38C08K5/3492C08K13/02
CPCC08K3/32C08K3/38C08K5/053C08K5/34922C08K13/02C08K2003/323C08L2201/02C08L23/12
Inventor 刘小祥王倩宋瑛孙海超夏凤愉胡娜王园于召民
Owner 南京工业大学连云港工业技术研究院
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