Polylactic resin composition with high heat resistance and high flexibility and preparation method of composition

A technology of polylactic acid resin and composition, which is applied in the field of high heat-resistant and high-toughness polylactic acid resin composition and its preparation, can solve the problem that polylactic acid resin cannot have both high heat resistance and high toughness, and achieve high heat resistance The effect of high stability, high processing efficiency and good processing performance

Inactive Publication Date: 2013-02-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the problem that the polylactic acid resin in the prior art cannot have both high heat resistance and high toughness, the present invention provides a high heat resistance and high toughness polylactic acid resin composition and its preparation method

Method used

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  • Polylactic resin composition with high heat resistance and high flexibility and preparation method of composition
  • Polylactic resin composition with high heat resistance and high flexibility and preparation method of composition
  • Polylactic resin composition with high heat resistance and high flexibility and preparation method of composition

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preparation example Construction

[0040] The poly-D-lactic acid copolymer is prepared from poly-D-lactic acid and the second component, and its preparation process is a well-known technology in the art. The present invention provides a preparation method of the poly-D-lactic acid copolymer, and the second component is added in the reaction device , initiator and catalyst, stir to disperse the components evenly, raise the temperature to 120-140°C and continue to stir for 1-3 hours, add poly-D lactic acid and replenish the catalyst under stirring, raise the temperature to 140-160°C for reaction 1 -3 hours, rise to 160-180°C and continue to react for 1-3 hours until the reaction is completed, the product is vacuumized, granulated, and dried to obtain poly-D lactic acid copolymer;

[0041]Wherein, initiator is the alcohol containing 1-18 carbon atoms, preferably dodecyl alcohol, and according to the difference of target molecular weight, its consumption is 0.1-1% of poly-D lactic acid quality;

[0042] The catalys...

Embodiment 1

[0063] Poly-D lactic acid, 50 parts by weight of a diblock poly-D-lactic acid copolymer sample with a polycaprolactone molar ratio of 1:1, and 50 parts by weight of a poly-L-lactic acid homopolymer were blended and granulated in a twin-screw extruder. The temperature settings of each section are: 190°C, 200°C, 210°C, 220°C, 210°C, the speed is: 50rpm, after granulation, it is injected into the injection molding machine, and the injection temperature is: 210°C , the injection pressure is 100MPa, the cooling time of the melt in the mold is 40 seconds, and the mold temperature is set at 85°C to obtain a polylactic acid resin composition. The polylactic acid resin composition was tested for mechanical and heat resistance properties, and the results are shown in Table 1.

Embodiment 2

[0065] Poly-D-lactic acid, polybutylene terephthalate-co-butylene adipate molar ratio of 5:1 diblock poly-D-lactic acid copolymer sample 30 parts, poly-L-lactic acid homopolymer 70 parts Blending and granulation in a twin-screw extruder, the temperature settings of each section of the screw are: 190°C, 200°C, 220°C, 230°C, 220°C, and the speed is 50rpm. After granulation, it is injected Injection molding in the machine, the injection temperature is: 210°C, the injection pressure is 100MPa, the cooling time of the melt in the mold is 60 seconds, and the mold temperature is set at 95°C to obtain a polylactic acid resin composition. The polylactic acid resin composition was tested for mechanical and heat resistance properties, and the results are shown in Table 1.

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Abstract

The invention discloses a polylactic resin composition with high heat resistance and high flexibility and a preparation method of the composition, solving the problem that polylactic resin with high heat resistance and high flexibility does not exist in the prior art. The polylactic resin composition consists of the following components in parts by weight: 50 to 99.5 weight parts of poly-L-lactic acid homopolymer and 0.5 to 50 weight parts of poly-D-lactic acid copolymer, wherein the poly-D-lactic acid copolymer is prepared from poly-D-lactic acid and a polymer with a flexible chain structure. The invention also provides the preparation method of the polylactic resin composition with high heat resistance and high flexibility. The preparation method is simple and suitable for industrialized production; and the prepared polylactic resin composition has high flexibility and heat resistance, the elongation at break reaches 16 percent, the notch impact strength reaches 12.2kJ/m<2>, and the vicat softening temperature reaches 113 DEG C.

Description

technical field [0001] The invention relates to a polylactic acid resin composition with high heat resistance and high toughness and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Polylactic acid is a biodegradable resin, which is made of lactic acid as a monomer, polycondensation of lactic acid or ring-opening polymerization of lactic acid dimer-lactide, polylactic acid has good biodegradability, and can More than 80% can be degraded within 100 days. [0003] Polylactic acid has high mechanical strength, but poor toughness. The tensile strength generally exceeds 45MPa, the elastic modulus is 2500MPa, and the notched impact is generally only 3-5kJ / m 2 , the elongation at break is 2-6%. In addition, polylactic acid is a semi-crystalline polyester resin. Under normal circumstances, the degree of crystallinity does not exceed 10%, and the glass transition temperature of polylactic acid is about 60°C, making polylactic a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04
Inventor 刘焱龙项盛冯立栋孙彬边新超陈学思
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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