Starch/epsilon-polylysine/poly (L-lactic acid) bi-crosslinking material as well as preparation method and application thereof

A technology of polylysine and double cross-linking, which is applied in the field of starch/ε-polylysine/poly double cross-linking materials and its preparation, can solve the problem that the material is easy to be polluted and moldy, it is difficult to exert antibacterial effect, and it is not considered and other issues, to achieve the effect of good broad-spectrum antibacterial properties, universal applicability, and good biocompatibility

Pending Publication Date: 2022-04-01
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, ε-PL is a highly hydrophilic polymer molecule, which exists in the form of polycations through the protonation of ε-amino groups under acidic and neutral conditions. It cannot be stably attached to the surface of materials, and it is difficult to exert antibacterial effect, which seriously limits its application. Starch has been widely used because of its low cost and good biodegradability. Patent CN201910897078.0 invented a starch-based water-based polyurethane emulsion, which can significantly improve the mechanical strength of wrapping paper, especially the surface water resistance, and can Used as a coating for packaging paper and cardboard
However, it does not take into account that the nutrients in starch can provide good breeding conditions for mold, especially in a humid environment, the material is easily polluted and moldy

Method used

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  • Starch/epsilon-polylysine/poly (L-lactic acid) bi-crosslinking material as well as preparation method and application thereof
  • Starch/epsilon-polylysine/poly (L-lactic acid) bi-crosslinking material as well as preparation method and application thereof
  • Starch/epsilon-polylysine/poly (L-lactic acid) bi-crosslinking material as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0026] A kind of preparation method of starch / ε-polylysine / poly (L-lactic acid) double crosslinking material, comprises the following steps:

[0027] Add catalyst and starch dispersion to the isocyanate-terminated side chain aldehyde group-containing polyurethane prepolymer (PO) solution, heat up to 70-80°C and stir for reaction, after the infrared detection-NCO characteristic absorption peak disappears (about 30- 60min), cool the system down to 10-12°C, add ε-polylysine solution cooled to 10-12°C into the system, stir rapidly, pour it into the mold, degas, and stand at 40°C Let the solvent evaporate for about 10 days to form a film, and finally dry the film to a constant weight to obtain a starch / ε-polylysine / poly(L-lactic acid) double cross-linked film material. Preferably, the schematic diagram of PO structure is as follows:

[0028]

[0029] Among them, R 1 for n=80~135, m=2~5, p=4~9;

[0030] In some embodiments, the content of aldehyde groups in PO is 0.6-1.1 mmo...

Embodiment 1

[0052] Add the DMF dispersion of starch (3.4g dispersed in 20mL DMF) to 20g PO solution, and stir the reaction at 75°C until the infrared detection-NCO characteristic absorption peak disappears (about 40min). Cool the system down to 10°C, add ε-polylysine solution (1.5g dissolved in 5mL DMF) at 10°C under stirring, stir rapidly for 1-2min, remove the dissolved gas under reduced pressure, and pour it slowly into Put it into the mold, let it stand at 40°C to evaporate the solvent for about 10 days, and finally dry the membrane material to constant weight to obtain the starch / ε-polylysine / poly(L-lactic acid) double cross-linked membrane material, denoted as Q1.

Embodiment 2

[0054] Add the DMF dispersion of starch (3.4g dispersed in 20mL DMF) to the 20g PO solution, and react under stirring until the infrared detection-NCO characteristic absorption peak disappears (about 40min). Cool the system down to 10°C, add ε-polylysine solution (6.5g dissolved in 15mL DMF) at 10°C under stirring, remove the dissolved gas under reduced pressure after rapid stirring, and slowly pour it into the mold, 40 Stand at ℃ to evaporate the solvent for about 10 days, and finally dry the membrane material to a constant weight to obtain a starch / ε-polylysine / poly(L-lactic acid) double-crosslinked membrane material, which is designated as Q2.

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Abstract

The invention belongs to the field of natural high polymer materials, and provides a starch / epsilon-polylysine / poly (L-lactic acid) bi-crosslinking material and a preparation method and application thereof.The preparation method comprises the following steps that a catalyst and starch dispersion liquid are added into an isocyanato-terminated polyurethane prepolymer (PO) solution with the side chain containing aldehyde groups, the temperature is increased to 70-80 DEG C, a stirring reaction is conducted, and a reaction liquid is obtained; after infrared detection of disappearance of an-NCO characteristic absorption peak (about 30-60 min), cooling the system to 10-12 DEG C, adding an epsilon-polylysine solution cooled to 10-12 DEG C into the system, rapidly stirring, pouring into a mold, degassing, standing at 40 DEG C to volatilize a solvent for about 10 days to form a film, and finally drying the film to constant weight to obtain the epsilon-polylysine film. The starch / epsilon-polylysine / poly (L-lactic acid) bi-crosslinked membrane material is obtained. The material has good mechanical properties, degradability, broad-spectrum antibacterial property and cytocompatibility, not only can be applied to degradable plastics and food packaging materials, but also has a good prospect in the field of medical implant materials.

Description

technical field [0001] The invention belongs to the technical field of preparation of natural polymer materials, and in particular relates to a starch / ε-polylysine / poly(L-lactic acid) double-crosslinked material and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Polyurethane is a block copolymer produced by polyaddition reaction of isocyanate and polyol. The wide application of polyurethane materials is mainly due to its adjustable molecular chain structure and molecular weight, strong designability, environmental friendliness, and outstanding comprehensive performance. In the actual synthesis process, the PU chain structure and m...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J3/24C08L75/06C08L3/02C08L77/04
CPCY02W90/10
Inventor 侯昭升秦子昊纪晨旭尚凤丽吴凤莲曲蕾
Owner SHANDONG NORMAL UNIV
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