Preparation of polylactic acid composite material with flame-retardant function

A composite material and polylactic acid technology, applied in the field of preparation of flame retardant composite materials, can solve the problems of material mechanics, poor processing performance, low oxygen index, high flame retardant addition amount, and achieve good anti-melting performance and improve Mechanical properties, effect of high flame retardant grade

Inactive Publication Date: 2014-12-10
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with other polymer materials, polylactic acid is easy to burn, has low oxygen index, brittle performance, and low crystallinity, which restrict its application in a wider range of fields. Therefore, the development of flame retardant and better mechanical properties, Polylactic acid composite materials with high crystallinity are imminent
[0003] At present, there are many studies on the flame retardant modification of polylactic acid materials. It is more common to add organic / inorganic flame retardants to the polylactic acid matrix to improve its combustion performance. However, this method has a high amount of flame retardants added, and the selected materials are: Certainly poisonous, not in line with the theme of green environmental protection; and the single addition of flame retardants can easily lead to problems such as material mechanics and processing performance deterioration

Method used

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  • Preparation of polylactic acid composite material with flame-retardant function

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take the obtained core / shell structure polymethylsiloxane / polymethyl methacrylate nanoparticles 6g, polyaryl phosphate 6.5g, dry at 70°C for 8 hours; polylactic acid 37.5g, dry at 60°C Dry for 7 hours. Put the three into the torque rheometer after physical blending, the temperature of the three sections are: 168-174°C, 170-175°C, 170-175°C; rotation speed 30rpm; blending 5-8min. Get the target material. The tensile strength and elongation at break are tested according to GBT1040.2-2006, the limiting oxygen index is tested according to GB / T2046.2-2009, and the vertical combustion is tested according to GB / T2408-2008. The mechanical, crystallization, heat resistance, and combustion properties of the new polylactic acid / polyaryl phosphate composite are shown in Table 1

Embodiment 2

[0030] Get the obtained core / shell structure polymethylsiloxane / polymethyl methacrylate nanoparticles 4.5g, polyaryl phosphate 8g, dry at 70°C for 8 hours; polylactic acid 37.5g, at 60°C Dry for 7 hours. Put the three into the torque rheometer after physical blending, the temperature of the three sections are: 168-174°C, 170-175°C, 170-175°C; rotation speed 30rpm; blending 5-8min. Get the target material. The tensile strength and elongation at break are tested according to GBT1040.2-2006, the limiting oxygen index is tested according to GB / T2046.2-2009, and the vertical combustion is tested according to GB / T2408-2008. The mechanical, crystallization, heat resistance, and combustion properties of the new polylactic acid / polyaryl phosphate composite are shown in Table 1

Embodiment 3

[0032] Take the obtained core / shell structure polymethylsiloxane / polymethyl methacrylate nanoparticles 3g, polyaryl phosphate 9.5g, dry at 70°C for 8 hours; polylactic acid 37.5g, dry at 60°C Dry for 7 hours. Put the three into the torque rheometer after physical blending, the temperature of the three sections are: 168-174°C, 170-175°C, 170-175°C; rotation speed 30rpm; blending 5-8min. Get the target material. The tensile strength and elongation at break are tested according to GBT1040.2-2006, the limiting oxygen index is tested according to GB / T2046.2-2009, and the vertical combustion is tested according to GB / T2408-2008. The mechanical, crystallization, heat resistance, and combustion properties of the new polylactic acid / polyaryl phosphate composite are shown in Table 1

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Abstract

The invention discloses preparation of a polylactic acid composite material with a flame-retardant function. The preparation comprises the following steps: mixing polylactic acid, core / shell-methyl polysiloxane / polymethyl methacrylate particles and polyarylate phosphate; carrying out melt blending by adopting torque rheology at the temperature of 168-180 DEG C to obtain the polylactic acid composite material with the flame-retardant function, wherein the weight percent of the core / shell-methyl polysiloxane / polymethyl methacrylate particles is 0%-25%, the weight percent of the polyarylate phosphate is 0%-25%, and the core / shell-methyl polysiloxane / polymethyl methacrylate particles and the polyarylate phosphate can not be 0 simultaneously. Compared with the traditional polylactic acid flame-retardant material, the polylactic acid composite material has the advantages of better flame-retardant property, mechanical property, crystallization property and heat-resistant property.

Description

technical field [0001] The invention belongs to the field of preparation of flame-retardant composite materials, in particular to a preparation method of a novel polylactic acid composite material with flame-retardant function and core / shell-polymethylsiloxane / polymethyl methacrylate nanoparticles. Background technique [0002] Polylactic acid is a thermoplastic with good processing performance and biocompatibility. It is widely used in medical, pharmaceutical, agricultural, packaging materials and other industries. Its synthetic raw material lactic acid can be extracted from corn, cassava, potato and other biological materials. Starch , and then fermented by lactic acid bacteria, and the carbon dioxide and water produced by the decomposition of polylactic acid can become the starting raw material of starch again under the action of biological photosynthesis, which is a completely natural circulation type of biological material. (Polymer Degradation and Stability.2012, 97:24...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L33/10C08K5/523C08F220/14C08F222/14C08G77/04
Inventor 王新龙杨媛媛黄颖王通文周露居亚庆廖逢辉史加新
Owner NANJING UNIV OF SCI & TECH
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