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Amination lignin containing reactive amino and preparation and application thereof

A technology of aminated lignin and reactivity, which is applied in the field of lignin, can solve problems such as no related reports, and achieve the effects of cost reduction, simple preparation method, and improvement of reactivity

Inactive Publication Date: 2013-11-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no reports on the synthesis of aminated lignin containing reactive primary and secondary amino groups

Method used

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  • Amination lignin containing reactive amino and preparation and application thereof
  • Amination lignin containing reactive amino and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Four-neck bottle, with a thermometer inserted into two ports, a dropping funnel, a condenser tube in one port, a stopper in the other port, and magnetic stirring. Dissolve 5 grams of degraded and purified small molecule alkali lignin in 50 milliliters of deionized water, add 1.5 grams of sodium hydroxide into the three-necked bottle at the same time, stir to dissolve completely, and slowly add epichlorohydrin 2.5 g, while adding epichlorohydrin dropwise, 1.5 g of sodium hydroxide was added in batches, 4 times in total, keeping the pH of the reaction system greater than 12, and reacting for 8 hours. After the reaction, add water to wash several times to neutrality, centrifugal precipitation to remove alkali agent and unreacted lignin, add acetone to wash several times, centrifugal precipitation to remove unreacted epichlorohydrin. A black solid was obtained, dried in a vacuum oven at 40°C, and ground to obtain epoxy lignin. The test epoxy value is 0.2%, and it is ready ...

Embodiment 2

[0047] Four-neck bottle, with a thermometer inserted into two ports, a dropping funnel, a condenser tube in one port, a stopper in the other port, and magnetic stirring. Dissolve 5 grams of degraded and purified small molecule alkali lignin in 50 ml of deionized water, add 1.5 g of sodium hydroxide into the three-necked bottle at the same time, stir to dissolve completely, and slowly add 2.5 g of epoxy For chloropropane, add 1.5 g of sodium hydroxide in batches at the same time as adding epichlorohydrin dropwise, for a total of 4 times, keep the pH of the reaction system greater than 12, and react for 8 hours. After the reaction, add water to wash several times to neutrality, centrifugal precipitation to remove alkali agent and unreacted lignin, add acetone to wash several times, centrifugal precipitation to remove unreacted epichlorohydrin. A black solid was obtained, dried in a vacuum oven at 40°C, and ground to obtain epoxy lignin. Test epoxy value is 0.196%, stand-by.

...

Embodiment 3

[0051] Four-neck bottle, with a thermometer inserted into two ports, a dropping funnel, a condenser tube in one port, a stopper in the other port, and magnetic stirring. Dissolve 10 grams of degraded and purified small molecule alkali lignin in 50 ml of deionized water, add 3 g of sodium hydroxide into the three-necked bottle at the same time, stir to dissolve completely, and slowly add epichlorohydrin 5.5 g, while adding epichlorohydrin dropwise, 3 g of sodium hydroxide was added in batches for a total of 4 times, keeping the pH of the reaction system greater than 12, and reacting for 8 hours. After the reaction, add water to wash several times to neutrality, centrifugal precipitation to remove alkali agent and unreacted lignin, add acetone to wash several times, centrifugal precipitation to remove unreacted epichlorohydrin. A black solid was obtained, dried in a vacuum oven at 40°C, and ground to obtain epoxy lignin. Test epoxy value is 0.206%, stand-by.

[0052] 1.5 grams...

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Abstract

The invention relates to an amination lignin containing reactive aminos and a preparation method and an application of the amination lignin. The amination lignin containing the reactive aminos has a structural formula as shown in the description. The preparation method comprises the following steps: taking alkaline lignin and epoxy chloropropane as raw materials to synthesize epoxy lignin containing a plurality of epoxide groups under a certain condition; allowing the epoxy lignin derivatives and polyamine compound to react so as to prepare the amination lignin which contains a plurality of active groups such as primaquine groups and secondary amine groups. The amination lignin reserves favorable heat resistance of the alkaline lignin, and is a favorable base material for preparing a macromoleclar polymer material. Moreover, the amination lignin takes biomass which is a recycled material as the raw material, and is low in cost, environment-friendly in raw material, and generates less environment pollution, and therefore has an industrialized application prospect.

Description

technical field [0001] The invention belongs to the field of lignin, in particular to an aminated lignin containing reactive amine groups and its preparation and application. Background technique [0002] Lignin is one of the most complex natural polymers in the world. It is composed of three phenylpropane structural units - guaiacyl structure, syringyl structure and p-hydroxyphenyl structure through carbon-carbon bonds (C-C ) and ether linkages (-0-, alkyl ether linkages and aryl ether linkages), a three-dimensional network polymer with good thermal stability. Compared with cellulose and hemicellulose macromolecules, its structure lacks the order and regularity between repeating units, which makes the development and utilization of lignin difficult. [0003] In the 1960s and 1970s, people began to carry out a series of modification experiments on lignin, such as grafting lignin with styrene, methyl methacrylate, acrylamide, etc.; or using certain functional groups in the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C08G59/64
Inventor 赵涛潘虹
Owner DONGHUA UNIV
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