Lignin/polyether polyol impact-resistant and self-healing coating and preparation method thereof

A technology of polyether polyol and lignin, which is applied in the direction of lignin coating, polyether coating, coating, etc., can solve the problems of complex preparation process, poor impact strength, non-self-healing, etc., and achieve simple and efficient preparation process , Improve green properties, good adhesion performance effect

Active Publication Date: 2021-04-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the preparation of lignin-modified polyurethane, it is still necessary to use toxic substances such as isocyanate, and the resulting lignin-modified polyurethane has poor adhesion and does not have self-healing and impact resistance properties.
[0005] To sum up, traditional methods have problems such as complex preparation process, the need for toxic raw materials such as isocyanate, and relying on petrochemical resources, which are not green. However, lignin modification also has problems such as poor impact strength and self-healing after abrasion.

Method used

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  • Lignin/polyether polyol impact-resistant and self-healing coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (1) Weigh 25g of lignin, dissolve it in 1L of 0.1M NaOH solution, and then slowly add 0.1M dilute HCl solution dropwise with a peristaltic pump under the conditions of stirring speed of 100rpm and temperature of 30°C for acid precipitation, adding The acid settling time is 2h until the lignin is precipitated;

[0070] (2) Centrifuge, pour off the supernatant, place the lignin precipitate in a 1000Da dialysis bag, soak and wash the dialysis bag in running water for 24 hours, repeat the dialysis 3 times, and freeze-dry to obtain a high-purity product with a purity of more than 99.7%. Lignin;

[0071] (3) Dissolve the high-purity lignin obtained in step (2) in 0.1M NaOH solution, and perform ultrafiltration using an ultrafiltration device: first, use a filter membrane with Mw=8000 to ultrafilter, and take out the lignin base with Mw>8000 solution, and then it is ultrafiltered by a filter membrane with Mw=10000, and the filtrate is taken out to be a high-purity lignin solu...

Embodiment 2

[0077] (1) Weigh 25g of lignin, dissolve it in 1L of 0.1M NaOH solution, and then slowly add 0.1M dilute HCl solution dropwise with a peristaltic pump under the conditions of stirring speed of 100rpm and temperature of 30°C for acid precipitation, adding The acid settling time is 2h until the lignin is precipitated;

[0078](2) Centrifuge, pour off the supernatant, place the lignin precipitate in a 1000Da dialysis bag, soak and wash the dialysis bag in running water for 24 hours, repeat the dialysis 3 times, and freeze-dry to obtain a high-purity product with a purity of more than 99.7%. Lignin;

[0079] (3) Dissolve the high-purity lignin obtained in step (2) in 0.1M NaOH solution, and perform ultrafiltration with an ultrafiltration device: first use a filter membrane with Mw=5000 to ultrafilter, and take out the lignin base with Mw>5000 solution; then it is ultrafiltered by a filter membrane of Mw=8000, and the filtrate is taken out to be a high-purity lignin solution of Mw...

Embodiment 3

[0085] (1) Weigh 25g of lignin, dissolve it in 1L of 0.1M NaOH solution, and then slowly add 0.1M dilute HCl solution dropwise with a peristaltic pump under the conditions of stirring speed of 100rpm and temperature of 30°C for acid precipitation, adding The acid settling time is 2h until the lignin is precipitated;

[0086] (2) Centrifuge, pour off the supernatant, place the lignin precipitate in a 1000Da dialysis bag, soak and wash the dialysis bag in running water for 24 hours, repeat the dialysis 3 times, and freeze-dry to obtain a high-purity product with a purity of more than 99.7%. Lignin;

[0087] (3) Dissolve the high-purity lignin obtained in step (2) in 0.1M NaOH solution, and perform ultrafiltration with an ultrafiltration device: first, use a filter membrane with Mw=4000 to ultrafilter, and take out the lignin base with Mw>4000 solution; then it is ultrafiltered by a filter membrane with Mw=5000, and the filtrate is taken out to be a high-purity lignin solution w...

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Abstract

The invention belongs to the technical field of impact-resistant and self-healing coating materials, and particularly relates to a lignin/polyether polyol impact-resistant and self-healing coating and a preparation method thereof. The method comprises the steps: taking industrial lignin as a raw material, and obtaining purified lignin with high purity and a specific molecular weight range through purification and molecular weight grading; mixing part of purified lignin with high purity and the specific molecular weight range with styrene, and carrying out micro-nanocrystallization to obtain lignin-styrene micro-nano particles; and blending the rest purified lignin with high purity and the specific molecular weight range, lignin-styrene micro-nano particles and polyether polyol in the presence or absence of a solvent to obtain the lignin/polyether polyol impact-resistant self-healing coating. The coating has good adhesion performance and functions of impact resistance, self-healing and the like, the preparation process is simple, efficient, green and environmentally friendly, the raw materials are cheap and easy to obtain, and the green characteristic can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of impact-resistant and self-healing coating materials, in particular to a lignin / polyether polyol impact-resistant and self-healing coating and a preparation method thereof. Background technique [0002] Lignin is the second largest biomass resource after cellulose in plants, and is known as one of the most abundant green resources that can be utilized by humans in the 21st century. Impact-resistant composite materials are indispensable and important materials for the development of national economy and high technology, and have a wide range of uses. Traditional acrylics, polyurethanes, etc. rely on petrochemical products, and can only be used on specific materials and smooth surfaces. They are easily scratched by external forces, and do not have impact resistance and self-healing functions. [0003] Lignin is degradable and non-toxic. It is a natural polymer compound with a three-dimensional network struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D197/00C09D151/00C09D171/02C09D7/20
CPCC09D197/005C09D151/00C09D7/20C08L2205/03C08L51/00C08L71/02C08L97/005
Inventor 邱学青王淼刘伟峰杨东杰钱勇
Owner SOUTH CHINA UNIV OF TECH
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