木质素/LDH的制备及增强聚氨酯力学性能的研究

doi:10.19964/j.issn.1006-4990.2024-0310

Abstract

Abstract:

To reduce the cost and improve the mechanical properties of polyurethane coatings，Lignin/Mg-Al layered double hydroxide composites（Lignin-LDH） were prepared by hydrothermal reaction method，which were used as fillers in the polyurethane coating system to prepare Lignin/Mg-Al layered double hydroxide/PU composite coatings（Lignin-LDH-PU）.The effects of hydrothermal temperature on the properties and morphology of Lignin-LDH and the amount of Lignin-LDH on the adhesion grade，impact strength and pencil hardness of polyurethane coatings were investigated.The crystallinity，degree of recombination and thermal stability of Lignin-LDH composite fillers were increased with the increase of hydrothermal temperature.However，the recombination degree and thermal stability of lignin-LDH were decreased at the excessive hydrothermal temperature.Therefore，the optimal hydrothermal temperature was 180 ℃.The mechanical properties of Lignin-LDH-PU were increased with the increase of the addition of Lignin-LDH-180.However，the mechanical properties of lignin-LDH-PU were decreased with the excessive addition.With the optimal addition of 10% Lignin-LDH-180，the coating exhibited the best mechanical properties，including the adhesion grade of 5B，the impact strength of 115 cm（front） and 105 cm（back），and the pencil hardness of 3H.Compared to 10% LDH-PU，mechanical properties of 10%Lignin-LDH-180-PU were obviously enhanced.Therefore，Lignin-LDH-180 composite fillers prepared by hydrothermal reaction method presented good application prospect in polyurethane anticorrosive coating.

Key words: Lignin-LDH composites, hydrothermal reaction, polyurethane

CLC Number:

TB33

ZOU Liao, MA Xiaolin, LI Xiaobao, YE Judi. Study on preparation of Lignin/LDH and improvement of mechanical properties of polyurethane[J]. Inorganic Chemicals Industry, 2025, 57(1): 64-70.

Figures/Tables 9

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References 25

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样品	表干时间/min	附着力等级	抗冲击强度/cm		铅笔硬度
样品	表干时间/min	附着力等级	正面	反面	铅笔硬度
PU	6~7	5B	115	100	H
10%LDH-PU	7~8	3B	85	70	2H
2%Lignin-LDH-180-PU	7~8	5B	115	100	H
5%Lignin-LDH-180-PU	7~8	5B	115	100	2H
10%Lignin-LDH-180-PU	7~8	5B	115	105	3H
15%Lignin-LDH-180-PU	7~8	4B	100	80	3H
20%Lignin-LDH-180-PU	8~9	2B	80	65	2H

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Study on preparation of Lignin/LDH and improvement of mechanical properties of polyurethane

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