Flame-retarding toughened biodegradable polylactic acid material and preparation method thereof

A polylactic acid material and a biodegradable technology are applied in the field of flame retardant, toughening and biodegradable polylactic acid materials and their preparation, which can solve the problem of destroying the toughening effect of the toughening agent and affecting the dispersion behavior of the polylactic acid base material and the toughening agent. , destroying the chemical structure of the toughening agent, etc., to achieve the effect of improving melt viscosity, toughness, and network structure stability.

Active Publication Date: 2019-01-15
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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  • Flame-retarding toughened biodegradable polylactic acid material and preparation method thereof
  • Flame-retarding toughened biodegradable polylactic acid material and preparation method thereof
  • Flame-retarding toughened biodegradable polylactic acid material and preparation method thereof

Examples

Experimental program
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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-necked flask equipped with mechanical stirring, nitrogen inlet and suction outlet , After stirring and reacting at 170°C under normal pressure nitrogen atmosphere for 4h, inject 0.2 part of catalyst tetrabutyl titanate, evacuate until the atmospheric pressure in the bottle is lower than 200Pa, slowly raise the temperature to 230°C, continue stirring and react for 3h, then stop the reaction. The number average molecular weight of the obtained unsaturated polyester is 2.9*10 4 Da, weight average molecular weight is 5.4*10 4 Da, molecular weight distribution is 1.9, referred to as unsaturated polyester #1 for short.

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 normal pressure nitrogen atmosphere, inject 0.2 part of tetrabutyl titanate catalyst, evacuate until the atmospheric pressure in the bottle is lower than 200Pa, slowly raise the temperature to 220°C, continue to stir and react for 3.5 hours before stopping the reaction. The number average molecular weight of the obtained 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 for short.

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 the three ports equipped with mechanical stirring, nitrogen inlet and exhaust outlet In the flask, after stirring and reacting at 185°C for 2h under normal pressure nitrogen atmosphere, inject 0.2 part of catalyst tetrabutyl titanate, evacuating until the atmospheric pressure in the flask is lower than 200Pa, slowly heating up to 230°C, continue stirring and reacting for 2h, then stop the reaction. The number average molecular weight of the obtained 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 for short.

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Abstract

The invention discloses a flame-retarding toughened biodegradable polylactic acid material and a preparation method thereof. The preparation method includes melt blending of polylactic acid, unsaturated polyester, an initiator, a flame retardant, and a flame retarding synergist. The material reaches V-0 level in vertical combustion UL-94, is 27-34% in limit oxygen index, is 104-248% in break elongation, is 30-41 MPa in yield strength, and is 10-35 kJ / m<2> in notch impact strength. The polylactic acid material is improved in toughness through a grafting reaction to a crosslinking structure, formed by in-situ dynamic vulcanization, with the polylactic acid base material, wherein the network structure formed by the dynamic vulcanization of carbon-carbon double bonds is very stable and is notliable to be damaged by the flame retardant, so that a problem of the damage on the toughening effect due to addition of the flame retardant is solved.

Description

Technical field [0001] The invention belongs to the technical field of flame-retardant and toughened modified polylactic acid and its preparation, and specifically relates to a flame-retardant, toughened and biodegradable polylactic acid material and a preparation method thereof. Background technique [0002] With the ever-decreasing petrochemical resources and the increasingly serious environmental pollution problem, the demand for using renewable and degradable polymer materials is increasing. As a renewable and degradable bio-based plastic, polylactic acid has the advantages of a wide range of raw materials, high transparency, and high rigidity. It is not only used in disposable plastic products, agricultural film, fiber and other fields, but also began to be used in electronic appliances, automobiles , Rail transit and other fields have been developed and applied. However, polylactic acid is not only as flammable as most petroleum-based plastics, but also because of its low ...

Claims

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Application Information

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Patent Type & Authority Applications(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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