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Hyperbranched polysiloxane modified lignin compatilizer as well as preparation method and application thereof

A technology of polysiloxane and lignin, which is applied in the field of hyperbranched polysiloxane modified lignin compatibilizer and its preparation, and can solve problems such as easy agglomeration, insufficient performance of original lignin, and poor interfacial compatibilization effect , to achieve the effect of high chemical activity

Active Publication Date: 2022-06-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a hyperbranched polysiloxane modified lignin compatibilizer and its preparation method and application, to solve the problems in the prior art such as insufficient original lignin performance, easy agglomeration and poor interfacial compatibilization effect

Method used

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  • Hyperbranched polysiloxane modified lignin compatilizer as well as preparation method and application thereof
  • Hyperbranched polysiloxane modified lignin compatilizer as well as preparation method and application thereof
  • Hyperbranched polysiloxane modified lignin compatilizer as well as preparation method and application thereof

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Experimental program
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Effect test

preparation example Construction

[0094] Preparation of HBPSi with different end groups

[0095] Preparation of ethoxy hyperbranched polysiloxane

[0096] (1) 40g 1,3,5,7-tetraethylene-1,3,5,7-tetramethylcyclotetrasiloxane and 0.1g Karstedt catalyst were dispersed in 15mL methanol to give a mixed solution;

[0097] (2) The mixed solution of step (1) is stirred in an argon atmosphere at 60 °C for reflux; Then slowly add 15mL of methanol solution containing 25g of triethoxysilane, stir for 12h, and obtain a transparent silane oligomer by filtering and rotating evaporation;

[0098] (3) The silane oligomers in step (2) were mixed uniformly with maleic anhydride and Karstedt catalysts in the desired proportion (the molar ratio of maleic anhydride to silane oligomers was 1.5:1, and the molar ratio of Karstedt catalyst to silane oligomers was 0.15%:1), and the mixture was obtained;

[0099] (4) The mixture of step (3) is loaded into a four-well bottle filled with argon gas for conversion and kept at 60 °C for 12 h for t...

Embodiment 1

[0108] (1) Weigh the synthesized 3g EtO-HBPSi and 86g of o-xylene and mix evenly to obtain EtO-HBPSi / o-xylene mixture;

[0109] (2) Add 40g of organic lignin to the EtO-HBPSi / o-xylene mixture in step (1) and after ultrasonic dispersion for 15 min, an EtO-HBPSi / o-xylene / lignin mixture was obtained;

[0110] (3) The EtO-HBPSi / o-xylene / lignin mixture of step (2) was placed in an oil bath pot at 85 °C for condensation and reflux for 5h;

[0111] (4) At the end of condensation reflux, the lignin- (EtO-HBPSi) is filtered out using a suction filter device, and the filtration is washed and filtered 5 times with deionized water, and then freeze-dried under a vacuum environment of -70 °C for 48h to obtain lignin- (EtO-HBPSi), that is, a degradable ethoxy hyperbranched polysiloxane modified lignin compatilin compatient.

Embodiment 2

[0113] (1) Weigh the synthesized 3g EtO-HBPSi and 86g of o-xylene and mix evenly to obtain EtO-HBPSi / o-xylene mixture;

[0114](2) Add 90g of organic lignin to the EtO-HBPSi / o-xylene mixture in step (1) and after ultrasonic dispersion for 15 min, the EtO-HBPSi / o-xylene / lignin mixture was obtained;

[0115] (3) The EtO-HBPSi / o-xylene / lignin mixture of step (2) was placed in an oil bath pot at 85 °C for condensation and reflux for 5h;

[0116] (4) At the end of condensation reflux, the lignin- (EtO-HBPSi) is filtered out by means of a suction filter device, and the filtration is washed and filtered 5 times with deionized water, and then freeze-dried under a vacuum environment of -70 °C for 48h to obtain lignin- (EtO-HBPSi), that is, a degradable ethoxy hyperbranched polysiloxane modified lignin compatibilizer.

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Abstract

The invention discloses a hyperbranched polysiloxane modified lignin compatilizer as well as a preparation method and application thereof, belongs to the technical field of degradable polymer composite material compatibility additives, and solves the problems that existing lignin is poor in performance, easy to agglomerate and insufficient in compatibilization effect on a multiphase incompatible system. The preparation method comprises the following steps: by taking organic lignin as a main raw material, carrying out group reaction on the organic lignin and hyperbranched polysiloxane to prepare hyperbranched polysiloxane modified lignin (lignin-HBPSi); the modified lignin can be used as a compatibilizer of a polymer multiphase mixture to modify a polymer composite material. The lignin is low in price and easy to obtain, the hyperbranched polysiloxane is used for modifying the lignin, fusion of an incompatible interface of a polymer heterogeneous system can be improved, the mechanical and processing performance of the polymer composite material can be improved, meanwhile, the production cost is reduced, and the processing process is simple in technology, easy to operate and good in compatibilization effect.

Description

Technical field [0001] The present invention belongs to the field of degradable polymer composite compatibility additive technology, specifically relates to overbranched polysiloxane modified lignin compatibilizer and preparation method and application thereof. [0002] Technical background [0003] With the gradual replacement of traditional petroleum-based plastics by biodegradable plastics in the field of packaging, the development and application of degradable composites has attracted more and more attention. Researchers prepare degradable polymer composites with different properties according to the requirements of use, but in multiphase composite systems, the compatibility between materials is relatively poor due to differences in polarity, affecting the composite effect. Therefore, the fusion of multiphase interfaces is often improved by adding interfacial compatibilizers. Due to the low cost and fast degradation rate of lignin raw materials, they are often used as antioxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C08G77/42C08L67/04C08L67/02C08L83/10C08L97/00
CPCC08H6/00C08G77/42C08L67/04C08L67/02C08L83/10C08L97/005
Inventor 伍巍曹贤武黄敬鉥赵婉婧
Owner SOUTH CHINA UNIV OF TECH
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