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Synergistic modified methyl polysiloxane/poly-n-butyl methacrylate polylactic acid material of borax-intumescent flame retardant and preparation of synergistic modified methyl polysiloxane/poly-n-butyl methacrylate polylactic acid material

A technology of polybutyl methacrylate polylactic acid and polybutyl methacrylate is applied in the field of flame retardant, which can solve the problems of easy-to-melt drop secondary combustion, low elongation at break, low oxygen index, etc. Oxygen stability and barrier properties, good tensile strength and processability, effect of increasing surface density

Inactive Publication Date: 2014-12-17
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polylactic acid has good thermal stability, the processing temperature is 170-230 ℃, and the processing performance is good; but polylactic acid also has brittleness, low crystallinity, low oxygen index, and it is easy to melt and drop when burning and cause low secondary combustion. shortcoming
In order to expand the application range of polylactic acid, it is imperative to study the flame retardancy of polylactic acid. Chinese patent 201310008873.2 discloses a halogen-free flame-retardant polylactic acid nanocomposite material, whose limiting oxygen index reaches 30-40, and UL-94 also reaches V-0 level, but its tensile strength is below 20 MPa, and its elongation at break is also extremely low

Method used

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  • Synergistic modified methyl polysiloxane/poly-n-butyl methacrylate polylactic acid material of borax-intumescent flame retardant and preparation of synergistic modified methyl polysiloxane/poly-n-butyl methacrylate polylactic acid material
  • Synergistic modified methyl polysiloxane/poly-n-butyl methacrylate polylactic acid material of borax-intumescent flame retardant and preparation of synergistic modified methyl polysiloxane/poly-n-butyl methacrylate polylactic acid material
  • Synergistic modified methyl polysiloxane/poly-n-butyl methacrylate polylactic acid material of borax-intumescent flame retardant and preparation of synergistic modified methyl polysiloxane/poly-n-butyl methacrylate polylactic acid material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take core / shell-polymethylsiloxane / polybutylmethacrylate 6g, borax 0.5g, pentaerythritol diphosphate melamine salt 6.5g, dry at 60°C for 8h and pass through 80-mesh sieve, polylactic acid 37g Dry at 60°C for 8 hours, physically blend the four materials, and put them into the torque rheometer. Mix for 5-8 minutes. Get the target material.

Embodiment 2

[0031] Take core / shell-polymethylsiloxane / polybutylmethacrylate 4.5g, borax 0.5g, pentaerythritol diphosphate melamine salt 8g, dry at 60°C for 8h and pass through 80 mesh sieve, polylactic acid 37g Dry at 60°C for 8 hours, physically blend the four materials, and put them into the torque rheometer. Mix for 5-8 minutes. Get the target material.

Embodiment 3

[0033] Take core / shell-polymethylsiloxane / polybutylmethacrylate 3g, borax 0.5g, pentaerythritol diphosphate melamine salt 9.5g, dry at 60°C for 8h and pass through 80-mesh sieve, polylactic acid 37g Dry at 60°C for 8 hours, physically blend the four materials, and put them into the torque rheometer. Mix for 5-8 minutes. Get the target material.

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Abstract

The invention discloses a synergistic modified methyl polysiloxane / poly-n-butyl methacrylate polylactic acid material of a borax-intumescent flame retardant and a preparation method of the synergistic modified methyl polysiloxane / poly-n-butyl methacrylate polylactic acid material. The biological material is prepared from the following raw materials in percentage by weight: 74% of polylactic acid, 13-22% of pentaerythritol diphosphate melamine salt, 1% of borax and 3-12% of core / shell methyl polysiloxane / poly-n-butyl methacrylate nanoparticles. Firstly, the core / shell methyl polysiloxane / poly-n-butyl methacrylate nanoparticles are synthesized by a seed emulsion polymerization method, and then the borax, the pentaerythritol diphosphate melamine salt and the polylactic acid are evenly mixed by virtue of a torque rheometer after being fully dried, and then are subjected to injection molding to form standard splines.

Description

technical field [0001] The invention belongs to the technical field of flame retardancy, and in particular relates to a preparation method of polymethylsiloxane / polybutyl methacrylate polylactic acid material synergistically modified by borax-intumescent flame retardant. technical background [0002] With the predatory exploitation of petroleum resources by human beings and the increasing pollution of petrochemical polymers to the environment, it is imminent to use non-petroleum resources and environmentally friendly materials. Lactic acid, the raw material of polylactic acid, can be fermented from starch, and the decomposition products of polylactic acid are water and carbon dioxide, which are completely biodegradable materials. Polylactic acid has good thermal stability, the processing temperature is 170-230 ℃, and the processing performance is good; but polylactic acid also has brittleness, low crystallinity, low oxygen index, and it is easy to melt and drop when burning ...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L51/08C08K5/521C08K3/38
Inventor 王新龙杨媛媛王通文居亚庆黄颖周露史加新廖逢辉
Owner NANJING UNIV OF SCI & TECH
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