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A flame-retardant and toughened biodegradable polylactic acid material and its preparation method

A polylactic acid material, biodegradation technology, applied in the field of flame retardant and toughened biodegradable polylactic acid material and its preparation, can solve the problem of affecting the dispersion behavior of polylactic acid substrate and toughener, destroying the chemical structure of toughener, Destroy the toughening effect of the toughening agent and other problems, and achieve the effect of increasing the melt viscosity, stabilizing the network structure, and low price

Active Publication Date: 2021-05-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of the flame retardant will affect the dispersion behavior between the PLA substrate and the toughening agent, and even destroy the chemical structure of the toughening agent, thereby destroying the toughening effect of the toughening agent (Journal of Macromolecular Science: Part D-Reviews in Polymer Processing, 2014, 53(6):613-625)
For example, in the above-mentioned in-situ generation of cross-linked polyurethane toughened polylactic acid system, after adding 5wt% flame retardant, the notched impact strength of the material will be reduced to 5kJ / m 2 (Composites Communications, 2018, 8:52-57.)

Method used

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  • A flame-retardant and toughened biodegradable polylactic acid material and its preparation method
  • A flame-retardant and toughened biodegradable polylactic acid material and its preparation method
  • A flame-retardant and toughened biodegradable polylactic acid material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 16 parts of 1,3-propanediol, 13 parts of 1,4-butanediol, 5 parts of itaconic acid, and 66 parts of 1,10-sebacic acid in a three-neck flask equipped with mechanical stirring, nitrogen inlet and exhaust outlet After stirring and reacting for 4 hours at 170°C under a nitrogen atmosphere under normal pressure, inject 0.2 parts of tetrabutyl titanate as a catalyst, vacuumize the bottle until the atmospheric pressure is lower than 200Pa, slowly raise the temperature to 230°C, continue stirring for 3 hours, and then stop the reaction. The number average molecular weight of the obtained unsaturated polyester is 2.9*10 4 Da, the weight average molecular weight is 5.4*10 4 Da, molecular weight distribution is 1.9, referred to as unsaturated polyester #1.

Embodiment 2

[0034] Take 12 parts of 1,3-propanediol, 23 parts of 1,4-butanediol, 8 parts of maleic acid, and 57 parts of 1,10-sebacic acid in a three-necked flask equipped with mechanical stirring, nitrogen inlet and exhaust outlet After stirring and reacting for 4.5 hours at 175°C under a nitrogen atmosphere under normal pressure, inject 0.2 parts of tetrabutyl titanate as a catalyst, vacuumize the bottle until the atmospheric pressure is lower than 200Pa, slowly raise the temperature to 220°C, continue to stir and react for 3.5 hours, and then stop the reaction. The number average molecular weight of gained unsaturated polyester is 4.1*10 4 Da, the weight average molecular weight is 8.9*10 4 Da, molecular weight distribution is 2.2, referred to as unsaturated polyester #2.

Embodiment 3

[0036] Take 29 parts of 1,5-pentanediol, 13 parts of 1,4-butanediol, 9 parts of itaconic acid, and 49 parts of 1,8-suberic acid in three ports equipped with mechanical stirring, nitrogen inlet, and exhaust outlet. In the flask, after stirring and reacting for 2 hours at 185°C under a nitrogen atmosphere under normal pressure, inject 0.2 parts of the catalyst tetrabutyl titanate, vacuumize the bottle until the atmospheric pressure is lower than 200Pa, slowly raise the temperature to 230°C, continue to stir and react for 2 hours, and then stop the reaction. The number average molecular weight of gained unsaturated polyester is 4.3*10 4 Da, the weight average molecular weight is 9.2*10 4 Da, molecular weight distribution is 2.1, referred to as unsaturated polyester #3.

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Abstract

The invention discloses a flame-retardant, toughened and biodegradable polylactic acid material and a preparation method thereof. The method comprises melting and blending polylactic acid, unsaturated polyester, an initiator, a flame retardant and a synergistic flame retardant The vertical burning UL-94 of the obtained material is V-0 level, the limiting oxygen index is 27-34%, the elongation at break is 104-248%, the yield strength is 30-41MPa, and the notched impact strength is 10-35kJ / m 2 . The polylactic acid material provided by the present invention not only successfully improves the toughness of polylactic acid by utilizing the cross-linked structure formed by its in-situ dynamic vulcanization and grafting reaction with the polylactic acid substrate, but also the network structure formed after the dynamic vulcanization of carbon-carbon double bonds. It is very stable and not easily damaged by flame retardants, and avoids the problem of destroying the toughening effect after adding flame retardants in the prior art.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant and toughened modified polylactic acid and its preparation, and in particular relates to a flame-retardant and toughened biodegradable polylactic acid material and a preparation method thereof. Background technique [0002] With the decrease of petrochemical resources and the seriousness of environmental pollution, the demand for the use of renewable and degradable polymer materials is increasing. As a renewable and degradable bio-based plastic, polylactic acid has the advantages of wide source of raw materials, high transparency and high rigidity. , rail transit and other fields have been developed and applied. However, PLA is not only as flammable as most petroleum-based plastics, but also has low tensile and impact resistance, which hinders its further application and development. Therefore, how to improve the flame retardancy and mechanical properties of PLA is particularly important...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L67/06C08K5/14C08K3/32C08K7/24C08K5/3492C08K5/315C08K5/523C08K5/5333C08K3/26
CPCC08K2003/265C08K2003/323C08L67/04C08L2201/02C08L2201/06C08L67/06C08K5/14C08K3/32C08K7/24C08K5/34922C08K5/315C08K5/523C08K5/5333C08K3/26
Inventor 汪秀丽李德福赵禧贾蕴琬王玉忠
Owner SICHUAN UNIV
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