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Lignin amine modified aqueous polyurethane material, preparation method and application

A technology of water-based polyurethane and lignin amine, which is applied in the field of natural polymer materials, can solve the problems that the excellent properties of lignin cannot be reflected, the chemical activity of industrial lignin is low, and the direct reaction of isocyanate, etc., to achieve excellent anti-aging performance and solve the problem of dissolution The effect of low solubility and increasing solubility

Inactive Publication Date: 2014-04-02
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the application of lignin in the field of polyurethane, it is found that the chemical activity of industrial lignin is too low to react directly with isocyanate, resulting in poor compatibility of lignin polyurethane materials, and the excellent performance of lignin in materials cannot be reflected.
And it is difficult to find a good solvent for lignin, which limits the application of lignin in polyurethane materials, especially in waterborne polyurethane

Method used

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  • Lignin amine modified aqueous polyurethane material, preparation method and application
  • Lignin amine modified aqueous polyurethane material, preparation method and application
  • Lignin amine modified aqueous polyurethane material, preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Dissolve 60 parts by weight of enzymatic lignin with a molecular weight of 5000 and 50 parts by weight of diethylenetriamine in 0.6L of distilled water, adjust the pH to 10.5 with 1.0M hydrochloric acid and 1.0M sodium hydroxide, and mix well at room temperature Add 20 parts by weight of 37wt% formaldehyde solution dropwise, stir for 0.5h after the dropwise addition, and react at 50°C for 5h to obtain a reaction solution; at room temperature, precipitate the reaction solution and isopropanol at a volume ratio of 1:5, and filter the obtained The precipitate was washed three times with isopropanol, and dried in vacuum at 40°C for 10 hours to obtain enzymatic ligninamine (EHLA) in the form of brown yellow powder;

[0037] (2) After dehydrating 100 parts by weight of polypropylene glycol polyol with a molecular weight of 1500 at 100°C under reduced pressure, add 50 parts by weight of diphenylmethane diisocyanate under nitrogen protection, react at 65°C for 2.5 hours, and...

Embodiment 2

[0043](1) Dissolve 100 parts by weight of kraft lignin with a molecular weight of 7000 and 80 parts by weight of diethanolamine in 1.0L of distilled water, adjust the pH to 10.2 with 0.5M hydrochloric acid and 0.5M sodium hydroxide, mix well at room temperature and add 70 parts by weight dropwise 37wt% formaldehyde solution, stirred for 0.6h after dropwise addition, and reacted at 45°C for 8h to obtain a reaction solution; at room temperature, precipitated the reaction solution and isopropanol at a volume ratio of 1:3, and filtered the obtained precipitate with isopropanol Wash with propanol 3 times, and dry in vacuum at 50°C for 8 hours to obtain brown powdery sulfate ligninamine (KLA);

[0044] (2) After dehydrating 80 parts by weight of polytetramethylene glycol with a molecular weight of 1000 at 80°C under reduced pressure, add 35 parts by weight of toluene diisocyanate under nitrogen protection, react for 3 hours at 55°C, and then dropwise add 4 parts by weight of dimethyl...

Embodiment 3

[0050] (1) Dissolve 50 parts by weight of alkali lignin with a molecular weight of 3000 and 40 parts by weight of triethylenetetramine in 0.5L of distilled water, adjust the pH to 10.5 with 0.1M hydrochloric acid and 0.1M sodium hydroxide, mix well at room temperature and add 50 parts by weight dropwise 37wt% formaldehyde solution, stirred for 0.2h after the dropwise addition, and reacted at 75°C for 3h to obtain a reaction solution; at room temperature, precipitated the reaction solution and isopropanol at a volume ratio of 1:5, and filtered the obtained precipitate with isopropanol Wash with propanol for 3 times, and dry in vacuum at 60°C for 6 hours to obtain alkali ligninamine (ALA) in the form of brown powder;

[0051] (2) After 50 parts by weight of polypropylene glycol polyol with a molecular weight of 2000 was dehydrated under reduced pressure at 100°C, 25 parts by weight of toluene diisocyanate was added under nitrogen protection, and reacted at 75°C for 2 hours, and t...

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Abstract

The invention discloses a lignin amine modified aqueous polyurethane material, a preparation method and an application. According to the invention, lignin is modified through a Mannich reaction, organic amine is grafted to a benzene ring structure of lignin, the solubility of lignin in water is increased, the chemical activity of the reaction of lignin and polyisocyanate is enhanced, compared with hydroxyl, the amino activity of the prepared lignin amine is large, the obtained lignin amine enables easy reaction with polyisocyanates, the mutual acting force of the lignin and aqueous polyurethane matrix can be increased, the compatibility is good, and the problems of small dissolvability and low chemical activity of the lignin can be effectively solved. The prepared lignin amine can be taken as a reinforcing agent in the aqueous polyurethane material for reinforcing the material, presents excellent aging resistance performance, and can be taken as a cheap age proof agent of the polyurethane material.

Description

technical field [0001] The invention belongs to the field of natural polymer materials, and in particular relates to a lignin amine modified water-based polyurethane material and a preparation method and application thereof. Background technique [0002] Lignin is a renewable resource second only to cellulose in nature. It is a three-dimensional amorphous macromolecular complex polymer, and its basic chemical structure is composed of phenylpropane structural units. This structure of lignin allows it to play a reinforcing role in the material blend. In addition, the lignin structure contains a large number of phenolic hydroxyl groups, which make it have excellent thermal stability and antioxidant activity, so it has great application prospects in the fields of heat aging resistance and ultraviolet aging, and even in the field of flame retardancy. However, so far, human beings have not fully utilized lignin, most of which are burned as fuel or directly discharged into the env...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/64C08G18/48C08G18/12C08H7/00C08L75/04C08L75/08
Inventor 廖兵刘军邓理刘海峰郭庆祥
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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