Preparation method of lignin-based polyol

A technology of lignin-based polyols, which is applied in the field of preparation of lignin-based polyols, can solve the technical difficulties of polyurethane materials, high temperature and high pressure, and achieve high-value utilization, enhanced active sites, and reduced steric hindrance effects Effect

Inactive Publication Date: 2021-08-17
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In order to solve the technical problems of high temperature and high pressure of lignin modification conditions in the prior art, and the technical difficulties and limitations of lignin in the preparation of polyurethane materials, the present invention provides a preparation method of lignin-based polyols

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  • Preparation method of lignin-based polyol
  • Preparation method of lignin-based polyol
  • Preparation method of lignin-based polyol

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preparation example Construction

[0024] The invention discloses a method for preparing lignin-based polyols. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to realize the method. In particular, it should be pointed out that all similar substitutions and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and the relevant personnel can obviously make changes or appropriate changes and combinations to the method and application described herein without departing from the content, spirit and scope of the present invention to realize and Apply the technology of the present invention.

[0025] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with specific embo...

Embodiment 1

[0026] The preparation of embodiment 1 lignin-based polyol

[0027] Take corn stalks, dry them and pulverize the raw materials through a pulverizer, take 50-mesh powder, and extract 6 hours with benzene alcohol in a Soxhlet extractor to obtain the extracted corn stalks.

[0028] Take the extracted corn stalks in a reaction kettle and add water, the solid-to-liquid ratio of corn stalks to water is 1:20 (g / mL), react at 150°C for 1 hour, after the reaction, cool down to room temperature, and dissolve the reaction solution The solid residue obtained by filtration and washing was washed until neutral, and dried in an oven at 60°C.

[0029] The dried solid residue and 1mol / L NaOH solution were reacted at 70°C for 2 hours. The solid-liquid ratio of the solid residue to NaOH solution was 1:20 (g / mL). Adjust the pH to 5.5 with HCl, rotary steam under reduced pressure, pour into 95% ethanol solution and precipitate to remove the hemicellulose component, continue the rotary steaming of...

Embodiment 2

[0031] The preparation of embodiment 2 lignin-based polyols

[0032] Take corn stalks, dry them and pulverize the raw materials through a pulverizer, take 40-mesh powder, and extract 6 hours with benzene alcohol in a Soxhlet extractor to obtain the extracted corn stalks.

[0033] Take the extracted corn stalks in the reaction kettle and add water, the solid-to-liquid ratio of corn stalks to water is 1:20 (g / mL), react at 130°C for 0.5h, after the reaction, cool down to room temperature, and react The liquid was filtered and washed to obtain a solid residue, which was washed to neutral and dried in an oven at 60°C.

[0034] The dried solid residue and 1mol / L NaOH solution were reacted at 70°C for 2h. The solid-liquid ratio of the solid residue to NaOH solution was 1:20 (g / mL). Adjust the pH to 6.0 with HCl, rotary steam under reduced pressure, pour into 95% ethanol solution and precipitate to remove the hemicellulose component, continue the rotary steaming of the remaining sup...

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Abstract

The invention belongs to the technical field of high-value utilization of lignin components in renewable resources, and relates to a preparation method of a lignin-based polyol. The method comprises the following steps: extracting corn straws, carrying out hydrothermal treatment on the extracted corn straws, carrying out alkali extraction on solid residues obtained after the hydrothermal treatment, and carrying out mild epoxidation modification reaction on alkali lignin obtained after the alkali extraction to finally obtain the product lignin-based polyol. The lignin-based polyol can be efficiently and mildly prepared from agricultural and forestry waste corn straw raw materials, so that high-value utilization of lignin components in renewable resources is realized.

Description

technical field [0001] The invention belongs to the technical field of high-value utilization of lignin components in renewable resources, and relates to a preparation method of lignin-based polyols. Background technique [0002] Biomass resources have been attracting attention due to their abundant reserves and renewability. Biomass resources can be separated and transformed into high value-added and diversified products and energy through the biomass refining process. Lignin, one of the three major components in biomass, is still a key obstacle to its high-value utilization due to the complexity of its own structural units and the diversity of bonding mechanisms. At present, a large amount of lignin produced in the process of pulping and papermaking has been degraded, and its structure has been seriously damaged. In industry, only a small amount of lignin has been modified or used as a filler material for polymer production. The prime is burned directly as a heat source, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C08H8/00C08G18/64
CPCC08H6/00C08H8/00C08G18/6492
Inventor 吴苗彭建军张权陈铃华陈雪梅
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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