Poly(L-lactic acid) foaming material with rapid crystallization capacity and preparation method of poly(L-lactic acid) foaming material

A polylactic acid foaming and lactic acid technology, which is applied in the field of poly-L-lactic acid foaming materials and its preparation, can solve the problems of insufficient strength and density of foaming materials

Active Publication Date: 2021-06-08
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the above-mentioned patents all adopt the method of continuous extrusion and foaming to prepare heat-resistant polylactic acid sheets, although the application o

Method used

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  • Poly(L-lactic acid) foaming material with rapid crystallization capacity and preparation method of poly(L-lactic acid) foaming material
  • Poly(L-lactic acid) foaming material with rapid crystallization capacity and preparation method of poly(L-lactic acid) foaming material
  • Poly(L-lactic acid) foaming material with rapid crystallization capacity and preparation method of poly(L-lactic acid) foaming material

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preparation example Construction

[0096] The present invention completes and refines the overall technical scheme, better ensures the structure and parameters of the poly-L-lactic acid resin, improves the heat-resistant temperature and cell density of the polylactic acid foaming material, and enhances the foaming stability of the polylactic acid foaming material , the preparation method of the poly-L-lactic acid resin preferably comprises the following steps:

[0097] Under the action of an initiator and a catalyst, the L-lactide is polymerized, and then a capping agent is added to carry out a capping reaction to obtain a poly L-lactic acid resin.

[0098] more specific:

[0099] In the late stage of lactide polymerization under the action of initiator and catalyst, add an appropriate amount of end-capping agent, stir at 130-200°C for 5-30 minutes, and discharge to obtain poly-L-lactic acid resin with rapid crystallization characteristics.

[0100] In the invention, the L-lactide is polymerized under the action...

preparation example 1

[0135] In the L-lactide monomer, add corresponding initiators, catalysts, etc., react at 150°C for 2 hours, and then add end-capping agents, phenoxymethyloxirane, 1,2-epoxytetradecane, Among them, the molar ratio of the monomer raw material L-lactide monomer, phenoxymethyl oxirane, and 1,2-epoxytetradecane is 1:1:2, and the reaction is continued for 30 minutes, and the material is discharged , to obtain rapid crystallization type poly L-lactic acid resin A1, which was detected by GPC and had a number-average molecular weight of 170,000. It was detected by DSC that the semi-crystallization time of the resin was 1.8 minutes under isothermal conditions of 120°C.

preparation example 2

[0137] In the L-lactide monomer, add corresponding initiators, catalysts, etc., react at 150°C for 2 hours, and then add end-capping agents, glycidyl p-toluenesulfonate, 1,7-octadiene diepoxy Compound, wherein the molar ratio of L-lactide monomer, glycidyl p-toluenesulfonate, and 1,7-octadiene diepoxy compound is 1:2:2, continue to react for 30 minutes, and discharge , to obtain fast crystallization type poly L-lactic acid resin A2, the number average molecular weight of the resin is 220,000 as detected by GPC, and the semi-crystallization time of the resin is 1.6 minutes under the isothermal condition of 120° C. as detected by DSC.

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Abstract

The invention provides a polylactic acid foaming material. The polylactic acid foaming material is obtained by injection molding of raw materials. The raw materials comprise the following components in parts by mass: 90-98 parts of poly(L-lactic acid) resin, 1-9.9 parts of a PLLA-b-PDLA block copolymer, and 0.1-1 part of a nano bubble nucleating agent, wherein the poly(L-lactic acid) comprises end-capped poly(L-lactic acid); and the end-capped group comprises one or more of a benzene ring structure, a carbon chain structure with the number of carbon atoms greater than or equal to 4 and a polyalkylene oxide structure. According to the polylactic acid with the rapid crystallization capacity, the corresponding foaming material formula and the light-weight injection molding technology, a new direction is provided for preparation of a high-strength and low-gram-weight full-degradable material and subsequent research of the polylactic acid material, and the polylactic acid foaming material has the advantages of being high in heat-resistant temperature, has the characteristics of stable foaming, high cell density and the like at the same time, and is suitable for large-scale continuous production.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid foaming materials, and relates to a polylactic acid foaming material and a preparation method thereof, in particular to a poly-L-lactic acid foaming material with rapid crystallization ability and a preparation method thereof. Background technique [0002] Polymer foam materials have the advantages of light weight, sound and heat insulation, cushioning and shock absorption, and high specific strength, and are widely used in packaging, construction, transportation, daily necessities and other industries. However, traditional foamed plastic varieties such as polystyrene are difficult to decompose in the natural environment after use, and become the main source of white pollution. At the same time, due to the light weight of the foamed material, it is difficult to recycle. Polylactic acid (PLA) is a degradable polymer material derived from plant resources. It has been widely used in the fiel...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K3/34C08K3/26C08K3/36C08K3/22C08G63/91C08J9/12
CPCC08J9/122C08J9/0071C08J9/0061C08G63/912C08J2367/04C08J2467/04C08J2203/06C08J2203/08
Inventor 刘焱龙王天昶张宝冯立栋边新超李杲陈学思
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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