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Polylactic acid/polycarbonate composite material and preparation method thereof

A technology of polycarbonate and composite materials, which is applied in the field of polylactic acid/polycarbonate composite materials and its preparation, can solve problems such as adverse effects, easy precipitation of compatibilizers, and influence on various properties of materials, so as to prolong the service life, The effect of increasing compatibility

Inactive Publication Date: 2019-02-19
李丹丹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the compatibilizer added in the blending process of the polylactic acid / polycarbonate composite material is easy to precipitate and thus affect the properties of the material, the invention discloses a polylactic acid / polycarbonate composite material and a preparation method thereof. The composite material improves its compatibility with polycarbonate by modifying polylactic acid, without adding additional compatibilizers to avoid adverse effects on the properties of the material due to the precipitation of compatibilizers

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  • Polylactic acid/polycarbonate composite material and preparation method thereof
  • Polylactic acid/polycarbonate composite material and preparation method thereof
  • Polylactic acid/polycarbonate composite material and preparation method thereof

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Embodiment Construction

[0024] The present invention is described in further detail now in conjunction with embodiment.

[0025] The preparation method of modified polylactic acid of the present invention comprises the steps:

[0026] (1) prepolymerization: lactic acid and 2-hydroxyl-4-benzyloxycarbonylaminobutyric acid accounting for 7% of the total amount of lactic acid and 2-hydroxyl-4-benzyloxycarbonylaminobutyric acid are added in the reactor, Under the condition of vacuum stirring, heat up to 100°C, dehydrate for 2 hours, then heat up to 130°C for 7 hours, and cool to obtain a prepolymer;

[0027] (2) Polymerization: Add the prepolymer and 0.5% stannous chloride accounting for the mass of the prepolymer into the reactor, heat up to 150-200°C under vacuum stirring, polymerize for 15 hours, and cool to obtain modified polylactic acid.

[0028] The preparation method of unmodified polylactic acid of the present invention comprises the steps:

[0029] (1) Prepolymerization: Add lactic acid into t...

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Abstract

The invention belongs to the field of polymer composite materials, and particularly relates to a polylactic acid / polycarbonate composite material and a preparation method thereof. The polylactic acid / polycarbonate composite material is prepared from 30-70 parts of modified polylactic acid, 30-70 parts of polycarbonate and 0-20 parts of additives. According to the method, (S)-N-carbobenzyloxy-4-amino-2-hydroxybutyric acid is adopted for modifying PLA, a benzene ring structure is introduced into a PLA molecular chain, the compatibility between PLA and PC is improved, no additional compatibilizerneeds to be added in the process of mixing PLA and PC, the situation that phase separation of PLA and PC is caused by the precipitation of the compatibilizer and adverse effects are caused on variousproperties of the polymer composite material is avoided, and the service life of the material is prolonged; according to the polylactic acid / polycarbonate composite material, (S)-N-carbobenzyloxy-4-amino-2-hydroxybutyric acid adopted for modifying PLA contains amino groups, the amino groups can be introduced into the PLA / PC composite material, and the composite material is endowed with certain antibacterial properties.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a polylactic acid / polycarbonate composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a biodegradable polymer material made from renewable resources. It has attracted more and more attention because it can reduce the use of petroleum resources and can be degraded after being discarded. In addition, PLA has good fluidity in processing, but Poor heat resistance. Polycarbonate (PC) is a polyester polymer of carbonic acid. The molecular chain contains carbonate groups. It has excellent impact resistance and transparency, good mechanical properties, and has balanced rigidity and toughness at the same time. However, PC Poor processing fluidity. After PLA and PC are blended, they learn from each other and have excellent performance. However, PLA and PC are partially compatible, which makes it difficult to refl...

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Application Information

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IPC IPC(8): C08L67/04C08L69/00C08G63/08C08G63/685
CPCC08G63/08C08G63/6852C08L67/04C08L69/00
Inventor 李丹丹
Owner 李丹丹