Nano flame retardant for high polymer materials

A technology of polymer materials and nano-flame retardants, applied in the field of flame-retardant materials, can solve problems such as poor compatibility of polymer substrates, restrictions on phosphorus-containing flame retardants, uneven dispersion, etc., and achieve improved compatibility and good Flame retardant effect, microstructure improvement effect

Inactive Publication Date: 2018-01-19
KUNMING UNIV OF SCI & TECH
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  • Description
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AI Technical Summary

Benefits of technology

This patented new type of nanoparbon Black Ployphosum (NBP) that was discovered earlier had better stability compared to previous types like Platinum Fluoride). Unlike traditional fire retards agents such as aluminum hydrolyzate, this Nanobelt Black ployophyllite could mix well even when added at high levels while maintaining excellent physical characteristics similar to plastic composites used today. Additionally, unlike Aluminum HydroxyZinc Sulfamate (AH), Halon® Fire Retardancy Protocol II(NFPA2), Neutral Charge Balance Code 2923 describes how these compounds work together effectively to reduce harmful gas emissions from fires caused by burning combustible substances.

Problems solved by technology

The technical problem addressed in this patents relates to finding new ways to improve fire resistance without adding too much weight (increasing risk) to buildings made from these flamproofing agents.

Method used

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  • Nano flame retardant for high polymer materials
  • Nano flame retardant for high polymer materials
  • Nano flame retardant for high polymer materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The nano-flame retardant used for polymer materials in this example is black phosphorene aqueous dispersion prepared by ultrasonic stripping method, and the specific preparation steps are as follows: firstly, the block black phosphorus single crystal is ground in agate-pulverized platinum for 4 h, To obtain black phosphorus powder, use ultrapure water as a dispersant, stir to make it evenly mixed, and obtain a mixed solution, the solid-to-liquid ratio mg:mL is 1, the ultrasonic power is set to 200 W, and the ultrasonic time is 24 h, and then at 3000 r / Centrifuge at a speed of 1 min, and take the supernatant, which is the black phosphorene aqueous dispersion, and the whole process is protected by an inert atmosphere; the obtained black phosphorene dispersion is as follows: figure 1 As shown, the solid content of the dispersion liquid is 0.2 mg / mL, and observed by transmission electron microscope (TEM), the maximum surface average diameter of black phosphorene is 120 nm, ...

Embodiment 2

[0030] The nano-flame retardant used in polymer materials in this example is to prepare black phosphorene aqueous dispersion by ultrasonic stripping method. Phosphorus powder, using ultrapure water as a dispersant, stirred to mix the two evenly to obtain a mixed solution, the solid-to-liquid ratio mg:mL was 6, the ultrasonic power was set to 500 W, and the ultrasonic time was 8 h. Cool down, control the temperature not to exceed 40°C, then centrifuge at a rate of 4000 r / min, take the supernatant, which is the black phosphorene aqueous dispersion, and protect the entire process with an inert atmosphere; vacuum dry at room temperature to obtain concentrated The final aqueous dispersion of black phosphorene has a solid content of 0.50 mg / mL, an average diameter of the largest surface of 100 nm, and an average thickness of 20 nm.

[0031] Water-based polyurethane emulsion (polyurethane solid content is 35%) is used as the base material, and black phosphorene dispersion is added at...

Embodiment 3

[0035] In this example, the preparation method of the nano-black flame retardant--black phosphorene aqueous dispersion is the same as that of Example 2. At the same time, the block black phosphorus single crystal is placed in agate grinding platinum and ground for 1 h to obtain a particle size of 100-200. μm black phosphorus powder was used as a control sample. The black phosphorus powder and the black phosphorene dispersant of this example were added to the water-based polyurethane respectively, and the addition method was the same as that in Example 2 to obtain black phosphorus powder-polyurethane foam and black Phosphorene-polyurethane foam; then the oxygen index test and ignition experiment were carried out on the film respectively, and the results are shown in Table 3. It can be seen from Table 3 that the oxygen index of the waterborne polyurethane film added with black phosphorene is significantly improved, and it has excellent flame retardancy.

[0036] Table 3 Comparis...

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Abstract

Relating to new use of nano black phosphorus in the flame retardant field, the invention discloses a nano flame retardant for high polymer materials. The flame retardant is nano black phosphorus withat least a one-dimensional size of 0.5-100nm in a three-dimensional space, and includes black phosphorene, black phosphorus quantum dot, black phosphorus nanowire, black phosphorus nanoribbon, black phosphorus nanotube and other nanoscale black phosphorus products. Adding of the nano black phosphorus into a high polymer matrix material can effectively improve the material microstructure, overcomethe disadvantages of large particle, uneven dispersion, and poor compatibility with a polymer matrix in existing inorganic phosphorus flame retardants and the shortcomings of low phosphorus content, poor heat stability, easy migration, easy volatilization and the like in organic phosphorus-containing flame retardants. Nano black phosphorus has the characteristics of good flame retardant effect, low toxicity, low smoke, no halogen and the like, and is in line with the current green and environment-friendly development trend of flame retardants.

Description

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Claims

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Application Information

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Owner KUNMING UNIV OF SCI & TECH
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