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Intumescent flame retardant and compounding method thereof

An intumescent flame retardant and flame retardant technology, which is applied in the field of flame retardant preparation, can solve problems such as easy generation of molten droplets and limited use range, and achieve high flame retardant efficiency, good material compatibility, and less addition Effect

Inactive Publication Date: 2018-03-20
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 (reference: Huang Yan, Zhang Xiangyu, You Ge Yun et al.Research Progress on Polypropylene Intumescent Flame Retardants[J].Fine Chemical Intermediates,2011,41(6):1-7.)

Method used

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  • Intumescent flame retardant and compounding method thereof
  • Intumescent flame retardant and compounding method thereof
  • Intumescent flame retardant and compounding method thereof

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Experimental program
Comparison scheme
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Embodiment 1

[0026] According to the weight ratio of 2:1:1, ammonium polyphosphate, pentaerythritol, and melamine were weighed as compound flame retardants, mixed with polypropylene in an amount of 25 wt%, and mixed evenly in a high-speed mixer. Set the rotational speed of the twin-screw extruder to 300rmp, and the outlet temperature to 190°C. Add the mixed flame-retardant material to the twin-screw extruder for granulation to form solid mixed granules. The photo is as follows figure 2 . The solid pellets were injection molded into test specimens using an injection molding machine.

Embodiment 2

[0028] The composite flame retardant sample prepared in Example 1 was tested for oxygen index, flame retardancy grade and mechanical properties of the sample according to GB / T2406.2-2009 Plastic Oxygen Index Test Method.

[0029] The test results are shown in Table 1 below. The oxygen index of the blank polypropylene sample is 18%. After adding the intumescent nitrogen-phosphorus compound flame retardant, the oxygen index is significantly improved, the maximum is 34%, and the flame retardant grade reaches V-0. The test results of mechanical properties show that the intumescent nitrogen-phosphorus compound flame retardant has good compatibility with polypropylene raw materials.

[0030] Table 1 Compatibility of intumescent flame retardants with raw material polypropylene

[0031]

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Abstract

The invention discloses an intumescent flame retardant and a compound method thereof. The flame retardant is a mixture prepared by mixing ammonium polyphosphate, pentaerythritol and tripolycyanamide according to a mass ratio of (1 to 4) to 1 to 1. The compound method of the intumescent flame retardant comprises the steps: mixing the intumescent flame retardant and polypropylene in a high-speed mixing machine according to a proportion and utilizing a twin-screw extruder to extrude and granulate to form mixed solid particles. According to the compounding method disclosed by the invention, the ammonium polyphosphate, the pentaerythritol and the tripolycyanamide are utilized as raw materials to obtain the intumescent nitrogen-phosphorus compound flame retardant; the intumescent nitrogen-phosphorus compound flame retardant has the characteristics of small addition volume, high flame-retardant efficiency, good material compatibility, low toxicity, environmental friendliness and the like.

Description

technical field [0001] The invention relates to an intumescent flame retardant and a compounding method thereof, belonging to the field of flame retardant preparation. 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. (Reference: Zhang Yushan, Gao Chunjuan, Cai Ronghua. Application research and development trend of brominated flame retardants [J]. Chemical Industry and Engineering, 2009,26(5):460-466.) [0003] Inorganic flame retardants and phosphorus flame retardants are halogen-free, low toxicity, less dosage, high efficiency, and have the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K5/3492C08K5/053C08K3/32B29C47/92B29C48/92
CPCC08K3/32B29C48/92B29C2948/9259B29C2948/92704C08K5/053C08K5/34922C08K2003/323C08L23/12
Inventor 刘小祥王倩孙海超
Owner 南京工业大学连云港工业技术研究院