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Preparation of high boiling point alcohol lignin polyurethane

A high-boiling alcohol lignin and polyurethane technology, applied in the field of polyurethane manufacturing, can solve the problems of low chemical activity of sulfonate, low yield of propoxylated lignin, and high impurity content, and improve tensile strength and tensile strength. Elongation at break, increased swelling resistance, good modification effect

Inactive Publication Date: 2005-08-10
FUZHOU UNIV +1
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  • Summary
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  • Claims
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Problems solved by technology

However, lignosulfonate is extracted from traditional papermaking "black liquor", which not only contains high impurities, but also the natural lignin in plant raw materials undergoes major structural changes after being cooked with alkali and sulfite. Sulfonate has low chemical activity and cannot directly react with polyisocyanate. It must first react with propylene oxide to form propoxylated lignin before reacting with isocyanate to form polyurethane
The yield of propoxylated lignin is low, and a large amount of organic solvents are used, which will have an adverse impact on environmental protection and the manufacturing cost of polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: the preparation of high boiling alcohol lignin polyurethane

[0036] Sample 1.: Weigh 5.0g of high-boiling alcohol lignin and 2.5g of toluene diisocyanate (TDI) and dissolve them in 20ml of tetrahydrofuran, stir and heat to 60°C for one hour, then add 13.5g of polyether diol (PEG220 ) and 3.5 g of toluene diisocyanate (TDI), the system was heated to 80 ° C and maintained for two hours. The polyurethane prepared in the above experiment was poured on a glass sheet, and after drying to remove THF, the polyurethane film was sandwiched between two glass sheets and placed at 95°C for 8 hours to solidify to form a film.

[0037] Sample 2.: Weigh 18.5g of polyether diol (PEG220) and 6.0g of toluene diisocyanate (TDI) and dissolve in 20ml of tetrahydrofuran, stir and heat to 60°C, keep the system for one hour and raise the temperature to 80°C, and maintain for two hours. The polyurethane obtained in the above experiment was made into a polyurethane film in the sa...

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Abstract

A process for preparing the high-boiling-point alcohol lignin polyurethane includes such steps as preparing high-boiling-point alcohol lignin from wood, bamboo, straw and nut shell, dissolving it in organic solvent, mixing with polyol or its solution, stirring, adding polyisocyanate, heating, and thermally reacting while adding modified or filler.

Description

Technical field: [0001] The invention relates to the polyurethane manufacturing industry, in particular to the process and formula of using high boiling alcohol lignin and its derivatives as the main raw material of lignin polyurethane. Background technique: [0002] In the previous research reports on the preparation of lignin polyurethane, there was a precedent of using lignosulfonate as raw material. However, lignosulfonate is extracted from traditional papermaking "black liquor", which not only contains high impurities, but also the natural lignin in plant raw materials undergoes major structural changes after being cooked with alkali and sulfite. Sulfonate has low chemical activity and cannot directly react with polyisocyanate. It must first react with propylene oxide to form propoxylated lignin before reacting with isocyanate to form polyurethane. The yield of propoxylated lignin is low, and a large amount of organic solvent is used, which will have an adverse impact ...

Claims

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Application Information

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IPC IPC(8): C08G18/08C08L75/04
Inventor 程贤甦陈云平方华书李勉均
Owner FUZHOU UNIV
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