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Flame-retardant polylactic acid material of ternary composite flame-retardant system and preparation method thereof

A polylactic acid material and ternary composite technology, which is applied in the flame retardant field of polylactic acid material, can solve the problems of increased cost and large amount of addition, and achieve the effects of reducing burning droplets, promoting char formation, and strong interaction.

Inactive Publication Date: 2014-04-02
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Seongchan Pack et al. (Seongchan Pack, Ezra Bobo, Neil Muir, et al. Polymer, 2012, 53: 4787-4799) studied RDP-coated starch-modified polylactic acid materials. The results showed that RDP-coated starch effectively improved polylactic acid. The compatibility of lactic acid and fillers improves the impact strength and yield strength of polylactic acid materials to a certain extent, but when the UL 94 of flame-retardant polylactic acid materials reaches V0 level, the amount of modifier added reaches 20%. big, high cost

Method used

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  • Flame-retardant polylactic acid material of ternary composite flame-retardant system and preparation method thereof
  • Flame-retardant polylactic acid material of ternary composite flame-retardant system and preparation method thereof
  • Flame-retardant polylactic acid material of ternary composite flame-retardant system and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: Take by weighing 6.6g RDP, dissolve completely in 120ml chloroform, add the kenaf of 2.4g loading nano-zinc oxide therein and continue magnetic stirring for 0.5h, treat to disperse evenly, add 21g polylactic acid pellet wherein, continue to stir until Polylactic acid is completely dissolved without air bubbles, coated on a glass plate, and volatilized at room temperature; the dried product is added to a miniature conical twin-screw extruder, and the extrusion temperature is 175°C in the first zone, 177°C in the second zone, and 177°C in the third zone , 176°C in the fourth zone, after extrusion, cooling, and granulation, the flame-retardant polylactic acid material of the ternary composite flame-retardant system was obtained. According to the standard test method of GB / T2406-1993, the limiting oxygen index was 31.2%.

Embodiment 2

[0031] Example 2: Weigh 4.05g RDP, dissolve it completely in 120ml chloroform, add 0.45g kenaf loaded with nano-zinc oxide and continue magnetic stirring for 0.5h, until it is evenly dispersed, add 25.5g polylactic acid pellets to it, and continue stirring Until the polylactic acid is completely dissolved without air bubbles, coat a film on a glass plate and volatilize at room temperature; add the dried product to a miniature conical twin-screw extruder, and the extrusion temperature is 175°C in the first zone, 177°C in the second zone, and 177°C in the third zone ℃, four zones 176 ℃, after extrusion, cooling and granulation, the flame-retardant polylactic acid material of the ternary composite flame-retardant system was prepared. According to the standard test method of GB / T2406-1993, the limiting oxygen index was 30.6%.

Embodiment 3

[0032] Example 3: Weigh 3.6g RDP, dissolve it completely in 120ml chloroform, add 0.9g kenaf loaded with nano-zinc oxide and continue magnetic stirring for 0.5h, until it is evenly dispersed, add 25.5g polylactic acid pellets to it, and continue stirring Until the polylactic acid is completely dissolved without air bubbles, coat a film on a glass plate and volatilize at room temperature; add the dried product to a miniature conical twin-screw extruder, and the extrusion temperature is 175°C in the first zone, 177°C in the second zone, and 177°C in the third zone ℃, four zones 176 ℃, after extrusion, cooling and granulation, the flame-retardant polylactic acid material of the ternary composite flame-retardant system was prepared. According to the standard test method of GB / T2406-1993, the limiting oxygen index was 29.1%.

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Abstract

The invention discloses a flame-retardant polylactic acid material of a ternary composite flame-retardant system and a preparation method of the flame-retardant polylactic acid material. The ternary composite flame-retardant system comprises hibiscus cannabinus, nano-zinc oxide and a polymer type phosphorus-containing fire retardant. The preparation method of the flame-retardant polylactic acid material comprises the following steps: (1) performing alkali treatment on the hibiscus cannabinus, and assembling and loading the nano-zinc oxide on the processed hibiscus cannabinus surface; (2) dissolving the polymer type phosphorus-containing fire retardant in chloroform, adding the hibiscus cannabinus loaded with the nano-zinc oxide in the chloroform containing the polymer type phosphorus-containing fire retardant, stirring for a while, adding polylactic acid particles, and when the polylactic acid is completely dissolved and the solution is free of bubbles, forming film on a glass plate, volatilizing at room temperature, and drying; (3) adding the dried thin film in a twin-screw extruder, extruding, cooling and pelletizing the material to prepare the flame-retardant polylactic acid material of the ternary composite flame-retardant system. The flame-retardant polylactic acid material is simple in formula, free of halogen, environment-friendly and high in flame retardant efficiency, can reduce molten drop phenomenon, and effectively reduces further spreading of fire.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant polylactic acid materials, and in particular relates to a flame-retardant polylactic acid material of a ternary composite flame-retardant system and a preparation method thereof. Background technique [0002] As a biodegradable material, polylactic acid (PLA) has excellent mechanical properties, good transparency, and good compatibility, and can be made into fibers, films, sheets, etc. In recent years, the application range of polylactic acid has expanded from packaging and textiles to the fields of transportation, electronics, and electrical equipment. In these fields, the market requires materials to have certain flame-retardant properties to ensure the safe use of products. Flame retardancy is very important. [0003] The use of multiple different types of flame retardants can not only reduce the amount of flame retardants added, improve the flame retardancy of the material, bu...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K3/22C08K5/523
Inventor 王新龙周露
Owner NANJING UNIV OF SCI & TECH
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