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Modified lignin, preparation method and application of modified lignin in toughening flame-retardant composite material

A technology of flame-retardant composite materials and lignin, which is applied in the field of preparation of toughened flame-retardant composite materials, can solve problems such as poor dispersion, degradation of polyester polymer materials, and polymer embrittlement, and achieve the effect of improving toughness

Inactive Publication Date: 2020-10-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lignin molecules are prone to agglomeration due to their own chemical bonds, and their dispersion in the matrix is ​​poor, resulting in poor performance of composite materials
In addition, there are more hydroxyl functional groups on the surface, which can easily cause the degradation of polyester polymer materials and cause the polymer to become brittle

Method used

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  • Modified lignin, preparation method and application of modified lignin in toughening flame-retardant composite material
  • Modified lignin, preparation method and application of modified lignin in toughening flame-retardant composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of modified lignin, the steps are:

[0027] (1) Add melamine and formaldehyde with a mass ratio of 1:0.15 to water, and stir for 2 hours at 60°C;

[0028] (2) Alkaline lignin, formaldehyde and phytic acid are gradually added to the solution obtained in step (1) in a mass ratio of 0.5:0.25:0.5:1 to melamine, react at 90° C. for 5 hours, and filter and dry to obtain Modified lignin, denoted as LMP;

Embodiment 2

[0030] A preparation method of modified lignin, the steps are:

[0031] (1) Add melamine and formaldehyde with a mass ratio of 1:0.25 to water, and stir for 0.5h at 80°C;

[0032] (2) adding alkaline lignin, formaldehyde and phytic acid to melamine in a mass ratio of 1:0.5:1:1 into the solution obtained in step (1) step by step, reacting at 90° C. for 5 hours, and filtering and drying to obtain Modified lignin, denoted as LMP';

[0033] According to the formula and process listed in Table 1, the products obtained in Examples 1 and 2 were blended and granulated to obtain the masterbatches of the modified lignin toughened and flame-retardant composite materials of Examples 5-11 and the corresponding Comparative Examples 1-4.

[0034] Table I

[0035]

[0036]

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Abstract

The invention discloses modified lignin, a preparation method and application of the modified lignin in toughening flame-retardant composite materials, and belongs to the field of flame retardants andbio-based flame-retardant materials. The preparation method comprises the following steps of: adding melamine and formaldehyde into water according to a mass ratio of 1: (0.08-0.5), and carrying outa stirring reaction for 0.5-2 h at a temperature of 60-90 DEG C; gradually adding the alkaline lignin, formaldehyde and phytic acid into the solution obtained in the step (1) according to the mass ratio of (0.25-2): (0.13-1.0): (0.25-2): 1, reacting for 3-5 hours at the temperature of 50-90 DEG C, filtering and drying to obtain modified lignin; and blending polymer resin, modified lignin and a plasticizer to obtain the toughened flame-retardant composite material. The preparation method of the modified lignin toughened flame-retardant composite material is high in production efficiency, simplein process, excellent in performance, environment-friendly and easy to realize industrial production.

Description

technical field [0001] The invention belongs to the field of bio-based polymer materials, and in particular relates to a method for preparing a toughened and flame-retardant composite material based on modified lignin, a preparation method and its application. Background technique [0002] Lignin is abundant in nature and is the second most abundant natural polymer after cellulose. It mainly comes from the waste liquid of paper mills. At present, most of it is used as fuel, and only a small part is used as fuel. Chemical products cause a great waste of resources. The basic structural unit of lignin is phenylpropane, including: guaiacyl propane, syringyl propane and p-hydroxyphenyl propane; in addition, many functional functional groups are connected to the lignin structural unit, such as benzene ring, phenolic hydroxyl group, alcohol Hydroxyl group, carboxyl group, methoxy group, conjugated double bond, etc., which make lignin have strong reactivity and provide the possibil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C08L67/02C08L67/04C08L97/00C08K5/11C08K5/06
CPCC08H6/00C08L67/02C08L67/04C08L2201/02C08L2205/06C08L97/005C08K5/11C08K5/06
Inventor 东为富王冬李婷汪洋夏碧华张旭辉蒋杰杨伟军
Owner JIANGNAN UNIV
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