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Study on preparation of Lignin/LDH and improvement of mechanical properties of polyurethane
Received date: 2024-06-05
Online published: 2025-01-24
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
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 . DOI: 10.19964/j.issn.1006-4990.2024-0310
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