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Polyether polyol derived from solvent-free liquefied lignin, and preparation method thereof

A polyether polyol and lignin technology, applied in the field of preparing rigid polyurethane foam, can solve the problems of increasing the processing steps, affecting the performance of the prepared product, reducing the content of polyol, etc., to achieve increased strength, narrow molecular weight distribution, and simplified production process Effect

Inactive Publication Date: 2020-04-10
SHANGHAI DONGDA POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another research hotspot in applying lignin to the polyurethane industry is to liquefy lignin to form lignin polyether polyols, but the current liquefaction methods either have organic solvents that increase subsequent processing steps, or polyether polyols Alcohols or small molecule polyols are used as solvents, which reduces the content of polyols and affects the properties of the prepared products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 500g of dried wheat lignin and 0.12g of organic phosphazene salt catalyst into a 5L closed autoclave, and connect the vacuum pump and pure nitrogen to replace the closed autoclave with nitrogen three times. Next, weigh 1500g of propylene oxide and add it to the steel tank connected to the pressure-resistant reactor, and then press the propylene oxide into the closed high-pressure reactor several times. Start stirring and heat the closed autoclave. In order to avoid violent exothermic heat in the reaction process, the present invention adopts the reaction mode of staged heating. The reaction is divided into two stages according to the reaction temperature of 80-100°C and 130-150°C. The first stage reacts for 1.5 hours, and the second stage reacts for 3.0 hours . When the pressure in the closed high-pressure reactor drops to normal pressure, stop heating, stir to cool down to room temperature, stop stirring, and take out the product through the discharge port for d...

Embodiment 2

[0046] Weigh 600g of dried corncob lignin and 0.1g of organic phosphazene salt catalyst into a 5L closed autoclave, and connect the vacuum pump and pure nitrogen to replace the closed autoclave with nitrogen for three times. Next, weigh 1900g of propylene oxide and add it into the steel tank connected to the pressure-resistant reactor, and then press the propylene oxide into the closed high-pressure reactor several times. Start stirring and heat the closed autoclave. In order to avoid violent exothermic heat in the reaction process, the present invention adopts the reaction mode of stage heating, and the reaction is divided into two stages according to the reaction temperature of 80-100°C and 130-150°C, the first stage reacts for 2 hours, and the second stage reacts for 3.5 hours . When the pressure in the closed high-pressure reactor drops to normal pressure, stop heating, stir to cool down to room temperature, stop stirring, and take out the product through the discharge po...

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Abstract

The invention relates to a preparation method of polyether polyol derived from solvent-free liquefied lignin. The preparation method comprises the following steps: (1) mixing lignin, a catalyst and anepoxy compound in a closed container in an inert atmosphere under a pressurized condition to obtain a raw material mixture; (2) reacting the raw material mixture at a first temperature for a first predetermined period of time to obtain a first reaction mixture; and (3) reacting the first reaction mixture at at least a second temperature for a second predetermined period of time, reducing the pressure of the reaction system to normal pressure, and reducing the temperature of the reaction system to room temperature to obtain the polyether polyol derived from solvent-free liquefied lignin. The invention also relates to the polyether polyol prepared by using the method. The method has the advantages of no use of a solvent, simple process and no post-treatment. The polyether polyol prepared inthe invention has high polyol content and narrow molecular weight distribution, and can be used for preparing rigid foam polyurethane.

Description

technical field [0001] This application relates to the technical field of biomass material reuse and chemical synthesis. Specifically, this application relates to a polyether polyol derived from solvent-free liquefied lignin and its preparation method. The obtained polyether polyol can be used to prepare rigid foam Polyurethane. Background technique [0002] Lignin in lignin is an amorphous, aromatic polymer containing oxyphenylpropanol or its derivatives in its molecular structure widely present in plants. After liquefaction, lignin can be used to prepare polyurethane foam, so as to reduce the dependence of the polyurethane industry on petroleum resources, and the polyether polyol structure after liquefaction still contains many benzene ring structures, which is conducive to the preparation of polyurethane rigid polyol after liquefaction. Foam. [0003] At present, there are many research reports on the preparation and application of lignin at home and abroad. Among them...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28
CPCC08G65/2612
Inventor 李学庆王光辉董建国胡晨晨
Owner SHANGHAI DONGDA POLYURETHANE