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Modified polylactic acid system and preparation method thereof

A polylactic acid and system technology, applied in the field of modified polylactic acid system, can solve the problems of long molding cycle, increased energy consumption and high production cost, and achieve the effects of simplifying the preparation process, improving the crystallization performance and reducing the usage amount

Active Publication Date: 2017-01-25
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under the existing process conditions, the process conditions for obtaining heat-resistant polylactic acid products are complex, the molding cycle is long, and energy consumption increases, resulting in high production costs
At the same time, the addition of a large amount of various modifiers will lead to a decrease in the mechanical properties of the polylactic acid material and affect the mechanical strength of the product.

Method used

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  • Modified polylactic acid system and preparation method thereof
  • Modified polylactic acid system and preparation method thereof
  • Modified polylactic acid system and preparation method thereof

Examples

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preparation example Construction

[0046]Among the present invention, the preparation method of described modified polylactic acid system comprises the following steps:

[0047] Step 1, add a set amount of tris (2-hydroxyethyl) isocyanurate into the reaction kettle, add aromatic acid after heating up and melting, and react at the set temperature;

[0048] Step 2, drying the polylactic acid, dehydrating agent and the product in step 1, mixing according to the set weight ratio, and performing melt blending in the compounding equipment;

[0049] In step 3, the blend obtained in step 2 is granulated and dried to obtain a modified polylactic acid system.

[0050] In step 1, the melting temperature is selected to be 140°C to 170°C, so that THEIC can be melted efficiently and rapidly.

[0051] After THEIC is completely melted, add aromatic acid and heat up to a reaction temperature of 180°C to 210°C. At this temperature, with the discharge of the produced water, the esterification reaction can be carried out rapidly...

Embodiment 1

[0067] 1) Add 0.4mol THEIC to the reaction kettle, raise the temperature to 155°C, add 0.3molLPTA and 0.15g titanium-containing catalyst after the system is completely melted, stir and react at 190°C for 3 hours, cool to room temperature, and obtain a white powder sample TP43;

[0068] 2) Vacuum-dry PLA chips, APP and TP43 at 90°C for 12 hours, weigh 800g of PLA chips, 170g of APP and 30g of TP43 and mix them evenly, melt and blend them in a twin-screw extruder with a screw speed of 25r / min , the melting temperature is 190°C;

[0069] 3) After the reaction, the obtained blend was vacuum-dried at 80° C. for 12 hours, and the sample was named PLA / IFR43.

Embodiment 2

[0071] 1) Add 0.4moL THEIC to the reaction kettle, raise the temperature to 155°C, add 0.5molLPTA and 0.15g titanium-containing catalyst after the system is completely melted, stir and react at 190°C for 3 hours, cool to room temperature, and obtain a white powder sample TP45;

[0072] 2) Vacuum-dry PLA chips, APP and TP45 at 90°C for 12 hours, weigh 800g of PLA chips, 170g of APP and 30g of TP45 and mix them evenly, melt and blend them in a twin-screw extruder with a screw speed of 25r / min , the melting temperature is 190°C;

[0073] 3) After the reaction, the obtained blend was vacuum-dried at 80° C. for 12 hours, and the sample was named PLA / IFR45.

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Abstract

The invention provides a modified polylactic acid (PLA) system. The modified polylactic acid (PLA) system comprises 70 to 100 parts of polylactic acid by weight, 1 to 10 parts of modifier by weight and 15 to 20 parts of dehydrant by weight, wherein the modifier is selected from tri (2-hydroxyethyl) isocyanurate or any derivative or a combination of derivatives of the tri (2-hydroxyethyl) isocyanurate. According to the modified polylactic acid (PLA) system, the modifier and the dehydrant are combined so as to be used as an intumescent flame retardant and have the function of a nucleating agent, the modified polylactic acid (PLA) system can be used for improving the flame retardant property and the crystallization property of PLA materials, the consumption of PLA assistants is reduced by the versatility, and the mechanical properties and the stability of PLA cannot be influenced.

Description

technical field [0001] The invention relates to a polylactic acid system, in particular to a modified polylactic acid system with high flame retardancy and easy crystallization. Background technique [0002] Compared with traditional materials such as cement, glass, ceramics and steel, polylactic acid (PLA) material is a new polymer material, but it has good biodegradability, and has gradually become an important material in the fields of industry, agriculture and science and technology. However, as a thermoplastic polymer material, polylactic acid is a flammable material, and its limiting oxygen index is about 21%. After being ignited, the fire spreads rapidly, causing loss of personnel and property; The lives of people in the fire pose a great threat. Therefore, the flame retardant modification of polylactic acid materials used in many fields such as medical equipment, transportation facilities, and decorative materials has received extensive attention. [0003] A common...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K5/3492C08K3/32
CPCC08K3/32C08K5/34924C08K2003/323C08L67/04
Inventor 朱志国王锐魏丽菲董振峰靳昕怡
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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