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Long-chain branched polylactic acid resin and preparation method thereof

A technology of long-chain branching and polylactic acid, applied in the field of polymer materials, can solve the problems of poor blow molding performance, difficult foaming, and low melt strength, and achieve good blow molding performance, good toughness, and high melt strength Effect

Active Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low melt strength, difficult foaming and poor blow molding performance of existing linear polylactic acid, the present invention provides a long-chain branched polylactic acid resin, which has the advantages of high melt strength and high viscosity, and is easy to foam and blow. Good plasticity

Method used

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  • Long-chain branched polylactic acid resin and preparation method thereof
  • Long-chain branched polylactic acid resin and preparation method thereof
  • Long-chain branched polylactic acid resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The PLA of 1000g, 2g castor oil and other reagents (0.5g antioxidant 1010, 0.5g antioxidant 168 and 0.5g anti-hydrolysis agent polycarbodiimide) are mixed uniformly to obtain the mixed material; then the mixed The materials were added to a twin-screw extruder for melt blending, the melt blending temperature was 175 degrees Celsius, the screw speed was 45 rpm, and blended for 5 minutes. Then, the strips are drawn and pelletized to obtain the granular mixed resin; the granular mixed resin is subjected to dehydration and drying treatment. The mixed resin is irradiated at normal temperature, the irradiation source is (60) Co-γ rays, the irradiation rate is 2.22kGy / h, and the irradiation dose is 5kGy. After the radiation is finished, the sample is obtained.

Embodiment 2

[0044] The PLA of 1000g, 5g castor oil and other reagents (0.5g antioxidant 1010, 0.5g antioxidant 168 and 0.5g antihydrolysis agent polycarbodiimide) are mixed uniformly to obtain the mixed material; then the mixed The materials were added to a twin-screw extruder for melt blending, the melt blending temperature was 175 degrees Celsius, the screw speed was 45 rpm, and blended for 5 minutes. Then, the strips are drawn and pelletized to obtain the granular mixed resin; the granular mixed resin is subjected to dehydration and drying treatment. The mixed resin is subjected to irradiation treatment, the irradiation source is (60) Co-γ rays, and the irradiation rate is 2.22kGy / h. The irradiation dose is 5kGy. After the radiation is finished, the sample is obtained.

Embodiment 3

[0046] The PLA of 1000g, 8g castor oil and other reagents (0.5g antioxidant 1010, 0.5g antioxidant 168 and 0.5g antihydrolysis agent polycarbodiimide) are mixed homogeneously, obtain the material after mixing; Then after mixing The materials were added to a twin-screw extruder for melt blending, the melt blending temperature was 175 degrees Celsius, the screw speed was 45 rpm, and blended for 5 minutes. Then, the strips are drawn and pelletized to obtain the granular mixed resin; the granular mixed resin is subjected to dehydration and drying treatment. The mixed resin is subjected to irradiation treatment, the irradiation source is (60) Co-γ rays, and the irradiation rate is 2.22kGy / h. The irradiation dose is 5kGy. After the radiation is finished, the sample is obtained.

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Abstract

The invention provides a method for preparing long-chain branched polylactic acid. The method comprises the following steps: blending linear polylactic acid with castor oil and then carrying out radiation polymerization under radiation so as to obtain long-chain branched polylactic acid. The invention also relates to the long-chain branched polylactic acid. The preparation method provided by the invention is simple, easy to control and implement, good in operability and low in production cost, overcomes the problems of low strength, difficult foaming and poor blow molding performance of conventional linear polylactic acid melt and improves the processing performance of the long-chain branched polylactic acid to expand the application prospects of the long-chain branched polylactic acid.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a long-chain branched polylactic acid resin and a preparation method thereof. Background technique [0002] Polylactic acid is an ideal green polymer material. Its production is based on renewable plant resources. It has the characteristics of non-polluting and biodegradable production process. Polylactic acid is expected to become an alternative to petroleum-based general-purpose plastics. However, currently commercialized polylactic acid has defects such as low melt strength, high brittleness, insufficient toughness, and low elongation at break. These defects have become key technical problems hindering the development and application of polylactic acid. At present, the modification of the rheological behavior of polylactic acid melt mainly focuses on blending modification and copolymerization modification. Although these two methods can improve some properties of ...

Claims

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Application Information

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IPC IPC(8): C08F283/02C08F222/20C08F2/46C08L51/08
Inventor 杜影赵丽娜徐林齐可非唐伟刚
Owner CHINA PETROLEUM & CHEM CORP
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