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A kind of lignin/tannin composite polyurethane coating and preparation method thereof

A technology of compounding polyurethane and lignin, which is applied in the direction of coating, paper coating, non-fiber pulp addition, etc., can solve the problems of moisture resistance, antibacterial, poor weather resistance, refractory degradation, environmental pollution, etc., and promote the improvement of hydrophobic performance. Crosslink density, effect on coating properties

Active Publication Date: 2022-07-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, today's coating materials are mostly derived from petroleum-based products, which are difficult to degrade, and will cause environmental pollution and additional carbon emissions during use (JurkkaKusipalo, Zhang Meiyun. Paper and cardboard processing. China Light Industry Press. 2017)
In recent years, people have begun to seek to use biomass raw materials to prepare new coating materials to alleviate the negative impact of petroleum-based materials. Although commonly used biomass macromolecules such as starch, gelatin, cellulose, and protein are easy to process, their functions Single, and poor moisture resistance, antibacterial, and weather resistance, it is difficult to support complex and changeable application environments (Ma Jing, Chen Liwei, Wang Heng, etc. Preparation and performance of water-resistant surface sizing agent for soybean protein isolate paper. Fine Chemical Industry, 2019, 36: 169-175.)

Method used

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  • A kind of lignin/tannin composite polyurethane coating and preparation method thereof
  • A kind of lignin/tannin composite polyurethane coating and preparation method thereof
  • A kind of lignin/tannin composite polyurethane coating and preparation method thereof

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Effect test

Embodiment 1

[0033] A lignin / tannin composite polyurethane coating and a preparation method thereof, comprising the following steps (refer to figure 1 shown):

[0034] Step 1: Under the protection of nitrogen, according to the molar ratio of the total hydroxyl groups of lignin and hexamethylene diisocyanate as 1:3, take 10 g of acetic acid lignin and hexamethylene diisocyanate of the corresponding quality, and dissolve them in dimethyl methylene diisocyanate. In the sulfone, a dibutyltin dilaurate catalyst with a mass of 0.02% lignin was added to make the total concentration (mass fraction) of lignin and hexamethylene diisocyanate in dimethyl sulfoxide to be 30%, and the temperature was kept at 30 °C for 0.5 h, System 1 is obtained.

[0035]Step 2: Under the protection of nitrogen, according to the molar ratio of the total hydroxyl groups of tannins and hexamethylene diisocyanate is 1:0.8, take 10g of tannins and hexamethylene diisocyanate of the corresponding quality, and dissolve them i...

Embodiment 2

[0041] A lignin / tannin composite polyurethane coating and a preparation method thereof, comprising the following steps (refer to figure 1 shown):

[0042] Step 1: under nitrogen protection, be 1: 1 according to the mol ratio of total hydroxyl groups of lignin and toluene diisocyanate, get 10g acetic acid lignin, the toluene diisocyanate of corresponding quality, be dissolved in dimethyl sulfoxide, add lignin The total concentration (mass fraction) of lignin and toluene diisocyanate in dimethyl sulfoxide was 10% with 0.08% mass dibutyltin dilaurate catalyst, and the system was kept at 70°C for 2h to obtain system 1.

[0043] Step 2: under nitrogen protection, according to the mol ratio of tannin total hydroxyl group and toluene diisocyanate is 1: 2.5, get 10g tannin, toluene diisocyanate of corresponding quality, dissolve in dimethyl sulfoxide, add tannin quality 0.02% dibutyltin dilaurate catalyst was used to make the total concentration (mass fraction) of tannin and toluene ...

Embodiment 3

[0049] A lignin / tannin composite polyurethane coating and a preparation method thereof, comprising the following steps (refer to figure 1 shown):

[0050] Step 1: under nitrogen protection, be 1: 2 according to the mol ratio of lignin total hydroxyl and diphenylmethane diisocyanate, get 10g acetic acid lignin, the diphenylmethane diisocyanate of corresponding quality, be dissolved in dimethyl methylene In the sulfone, a dibutyltin dilaurate catalyst with 0.05% lignin mass was added, so that the total concentration (mass fraction) of lignin and diphenylmethane diisocyanate in dimethyl sulfoxide was 30%, and the temperature was kept at 50 °C for 1.5 h, System 1 is obtained.

[0051] Step 2: Under nitrogen protection, according to the molar ratio of total tannin hydroxyl groups and diphenylmethane diisocyanate as 1:1.5, take 10g of tannin and diphenylmethane diisocyanate of the corresponding mass, and dissolve them in dimethyl sulfoxide. Add 0.02% tannin mass dibutyltin dilaura...

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Abstract

The invention discloses a lignin / tannin composite polyurethane coating and a preparation method thereof. The method includes: constructing an isocyanate prepolymer of lignin and tannin; mixing the lignin prepolymer and tannin prepolymer and adding polyether or polyester polyol to prepare a lignin / tannin polyurethane intermediate; adding Ag / tannin Zn antibacterial ions and mixed well; finally the liquid coating is applied to the substrate and cured by crosslinking. The coating has high cross-linking density, so it has water and oil resistance; lignin and tannin are rich in benzene rings, which makes the coating anti-ultraviolet aging; The adhesion of Ag / Zn ions can be anchored to the remaining hydroxyl sites of tannins, which makes the coating have antibacterial properties. The composite coating in the present invention can be used for paper-based materials, imparting water-resistant, oil-resistant, antibacterial, and anti-aging properties to the paper base, and promoting the improvement of the mechanical strength of the paper base; and can also be used for the surface treatment of medical materials or personal care products to improve antibacterial properties. ability.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, in particular to a lignin / tannin composite polyurethane coating and a preparation method thereof. Background technique [0002] Coating materials are widely used in all walks of life and are indispensable and important materials in the process of social production and development. However, most of today's coating materials are derived from petroleum-based products, which are difficult to degrade and cause environmental pollution and additional carbon emissions during use (JurkkaKuusipalo, Zhang Meiyun. Paper and Cardboard Processing. China Light Industry Press. 2017). In recent years, people have begun to seek to use biomass raw materials to prepare new coating materials to alleviate the negative effects of petroleum-based materials, while commonly used biomass macromolecules such as starch, gelatin, cellulose, protein, etc. are easy to process, but functional Single, and poor moisture...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/24D21H17/57C08G18/64
CPCD21H19/24D21H17/57C08G18/6492
Inventor 张晖谢慧慧付时雨
Owner SOUTH CHINA UNIV OF TECH
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