A kind of halogen-free intumescent flame retardant system flame retardant polylactic acid material and preparation method thereof

A polylactic acid material and an intumescent technology, which is used in the field of flame retardancy and reinforcement of polylactic acid materials to achieve the effects of improving heat resistance and mechanical properties.

Active Publication Date: 2017-01-18
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the research of high-efficiency halogen-free flame-retardant polylactic acid reported publicly, there has not been the application of liquor distiller's grains as an additive to flame-retardant polylactic acid. help

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 700g of polylactic acid pellets, 50g of modified distiller's grains, and 250g of modified ammonium polyphosphate, mix the above pellets in a high-speed mixer, and add them to the torque flow under the conditions of conventional temperature and screw speed. Melt blending in a transformer to obtain the polylactic acid material of the present invention. The limiting oxygen index is 24.5%, no droplet phenomenon, UL-94 test V-0 level, the carbon residue rate at 600°C is 10.2%, and the tensile strength is 37.30MPa.

Embodiment 2

[0027] Weigh 700g of polylactic acid pellets, 100g of modified distiller's grains, and 200g of modified ammonium polyphosphate, mix the above pellets in a high-speed mixer, and add them to the torque flow under the conditions of conventional temperature and screw speed. Melt blending in a transformer to obtain the polylactic acid material of the present invention. The limiting oxygen index is 26.5%, no droplet phenomenon, UL-94 test V-0 level, the carbon residue rate at 600 ℃ is 12.4%, and the tensile strength is 40.57MPa.

Embodiment 3

[0029] Weigh 700g of polylactic acid pellets, 150g of modified distiller's grains, and 150g of modified ammonium polyphosphate, mix the above pellets in a high-speed mixer, and add them to the torque flow under the conditions of conventional temperature and screw speed. Melt blending in a transformer to obtain the polylactic acid material of the present invention. The limiting oxygen index is 32%, no droplet phenomenon, UL-94 test V-0 level, the carbon residue rate at 600°C is 15.8%, and the tensile strength is 43.11MPa.

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Abstract

The invention discloses a halogen-free expansive-type flame-retardant system flame-retardant polylactic acid material and a preparation method thereof. A system comprises polylactic particles, modified ammonium polyphosphate and carbonific. Surface pretreatment on the carbonific is carried out by virtue of a drying, crushing and washing method, and organic macromolecule phosphorus-containing flame-retardant agent is used for respectively modifying the surface pretreated carbonific and the ammonium polyphosphate, so that not only can the compatibility of the carbonific and the ammonium polyphosphate with a polylactic acid basal body be improved, the mechanical performance is improved, but also the flame-retardant performance of the material can be improved by virtue of the synergistic effect of various components; moreover, a compact and stable carbon layer is generated in combustion, an anti-melt dripping effect is realized, and the secondary combustion caused by the melt dripping can be effectively avoided.

Description

technical field [0001] The invention relates to the technical field of flame retardancy and reinforcement of polylactic acid materials, in particular to a flame-retardant polylactic acid material of a halogen-free intumescent flame-retardant system and a preparation method thereof Background technique [0002] Polylactic acid (PLA) is mainly made of starch raw materials derived from natural and renewable plant resources such as corn, which not only reduces the dependence on petroleum and other resources, but also indirectly reduces nitrogen oxides and sulfur oxides in the process of crude oil refining. emissions of polluting gases. In addition, after use, PLA and its products can be completely degraded by microorganisms, causing little pollution to the environment. Not only that, polylactic acid itself has excellent mechanical properties, but its flame retardant effect is poor, and the molten droplets are serious when burning, which can cause secondary combustion, which lim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K9/04C08K3/32C08K5/523
Inventor 王新龙居亚庆廖逢辉史加新代秀曹雨李嘉玮
Owner NANJING UNIV OF SCI & TECH
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