Heat-resistant modified polylactic acid material as well as preparation method and application thereof

A polylactic acid material and a heat-resistant modification technology are applied in the field of heat-resistant modified polylactic acid materials and their preparation, which can solve the problems of brittleness, low biodegradability and high temperature resistance of modified polylactic acid materials, and achieve high resistance to high temperature. The effect of strong brittleness, high biodegradability and low hygroscopicity

Active Publication Date: 2021-09-03
HUNAN AEROSPACE MAGNET & MAGNETO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art that the modified polylactic acid material is brittle, has low toughness, or is not resistant to high temperature, or has low biodegradability, and is affected by water absorption in a humid environment. A heat-resistant modified polylactic acid material with strong brittleness resistance, high toughness, high temperature resistance and high biodegradation rate

Method used

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  • Heat-resistant modified polylactic acid material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The heat-resistant modified polylactic acid material of this embodiment consists of 5 kilograms of polyglycolide, 3.0 kilograms of toluene diisocyanate,

[0066] 0.5 kg of castor oil, 0.15 kg of butanediol, 0.3 kg of toluene diisocyanate, 100 kg of polylactic acid resin, and 0.5 kg of nucleating agent ethylene bis stearamide.

[0067] Concrete preparation method comprises the following steps:

[0068] (1) Divide toluene diisocyanate into two parts of 2.7 kg and 0.3 kg, mix 5 kg of polyglycolide and 2.7 kg of toluene diisocyanate evenly, and react at a temperature of 60°C and a stirring speed of 80 r / min 3h, obtained material A;

[0069] (2) After mixing 0.5 kg of castor oil and 0.15 kg of butanediol evenly, react for 2 hours at a temperature of 240 °C and a stirring speed of 80 r / min. After the reaction, add 0.3 kg of toluene diisocyanate and mix evenly. React for 3 hours at a temperature of 60°C and a stirring speed of 80r / min to obtain material B;

[0070] (3) Afte...

Embodiment 2

[0074] The heat-resistant modified polylactic acid material of this embodiment consists of 10 kilograms of polyglycolide, 6 kilograms of isophorone diisocyanate, 1 kilogram of linseed oil, 0.2 kilogram of glycerin, 100 kilograms of polylactic acid resin, and 0.3 kilogram of nucleating agent Made from malonic acid dibenzoyl hydrazide TMC-300.

[0075] Concrete preparation method comprises the following steps:

[0076] (1) Divide isophorone diisocyanate into two parts of 5.4 kg and 0.6 kg, mix 10 kg of polyglycolide and 5.4 kg of isophorone diisocyanate evenly, and mix at a temperature of 60°C and a stirring speed of 80 Under the condition of r / min, react for 3h to obtain material A;

[0077] (2) After mixing 1 kg of linseed oil and 0.2 kg of glycerol evenly, react for 2 hours at a temperature of 250 °C and a stirring speed of 80 r / min, and then add 0.6 kg of isophorone diisocyanate to mix After uniformity, react for 3 hours at a temperature of 60°C and a stirring speed of 80r...

Embodiment 3

[0082] The heat-resistant modified polylactic acid material of this embodiment consists of 15 kilograms of polyglycolide, 10 kilograms of diphenylmethane diisocyanate, 1.5 kilograms of tung oil, 0.25 kilograms of ethylene glycol, 100 kilograms of polylactic acid resin, and 0.4 kilograms of nucleating agent talcum powder production.

[0083] Concrete preparation method comprises the following steps:

[0084] (1) Diphenylmethane diisocyanate is divided into two parts of 9 kg and 1 kg. After mixing 15 kg of polyglycolide and 9 kg of diphenylmethane diisocyanate evenly, stir at a temperature of 60 ° C and a stirring speed of 80 Under the condition of r / min, react for 3h to obtain material A;

[0085] (2) After mixing 1.5 kg of tung oil and 0.25 kg of ethylene glycol, react for 2 hours at a temperature of 250 ° C and a stirring speed of 80 r / min, and then add 1 kg of diphenylmethane diisocyanate after the reaction is completed and mix evenly , reacted for 3 hours at a temperature...

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Abstract

The invention discloses a heat-resistant modified polylactic acid material as well as a preparation method and application thereof. According to the heat-resistant modified polylactic acid material, a repeating unit structure is a linear structure formed by copolymerization of polylactic acid molecules and polyglycolide molecules, and a terminal group is an unsaturated grease alcoholysis product; and the heat-resistant modified polylactic acid material is formed by block copolymerization of a polylactic acid molecular chain and a polyglycolide molecular chain, wherein the mass fraction of unsaturated grease is 0.8 wt%-2.3 wt%. The heat-resistant modified polylactic acid material has the advantages of high brittleness resistance, high toughness, high temperature resistance, high biodegradation rate, low hygroscopicity and the like; the preparation method is simple and convenient to operate, does not discharge harmful substances, and is green and environment-friendly; and the heat-resistant modified polylactic acid material is particularly suitable for manufacturing fast food boxes and turnable beverage cup covers.

Description

technical field [0001] The invention relates to a modified polylactic acid material, in particular to a heat-resistant modified polylactic acid material and its preparation method and application. Background technique [0002] In recent years, people have realized that white pollution has seriously affected the ecological balance, and it is a development trend to replace non-degradable plastics with degradable plastics. [0003] Currently, degradable plastics include PLA, PBAT, and PBS. In particular, materials such as PLA have good strength and rigidity. As an ideal material to replace PP, they are widely used in disposable cup lids, lunch boxes and other fields. [0004] Since lunch boxes (such as hotel fast food boxes) need to have good high temperature resistance to avoid high temperature softening, and water resistance, compared with PP materials, currently commonly used PLA materials have disadvantages such as poor heat resistance temperature and poor toughness. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L91/00
CPCC08L67/04C08L2201/08C08L2201/06C08L91/005Y02W90/10
Inventor 武志清曾梅蓉李航肖高超肖钰杰
Owner HUNAN AEROSPACE MAGNET & MAGNETO
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