Corn cob lignin and application

A technology of corncob and lignin, which is applied in the application field of corncob lignin and corncob lignin, to achieve the effect of reducing production cost, low manufacturing cost and reducing dosage

Active Publication Date: 2013-09-04
JINAN SHENGQUAN GRP SHARE HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]Traditional lignin is obtained from papermaking wastewater through acid analysis, including lignosulfonate (wood sodium, wood calcium, etc.) The high-temperature cooking process destroys the activity of lignin, making it difficult to apply directly, and can only be used after modification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Obtaining corn cob lignin

[0036] Filter the corncob black liquor obtained by separating hemicellulose and cellulose from corncobs, adjust the pH of the filtrate to 2.5-4.5, precipitate lignin, cool to room temperature, centrifuge, and wash the filter cake with water until the pH is 6.5-7.0 , the electrical conductivity is below 1000 μs / cm, the filter cake is taken out and dried to obtain corncob lignin.

[0037] What is used to adjust the pH of the filtrate is sulfuric acid solution or hydrochloric acid solution with a mass fraction of 2-15%.

[0038] In order to speed up the precipitation process, the temperature of the filtrate can be raised to 30-70°C and then the pH can be adjusted.

Embodiment 2

[0040] A preparation method of rigid polyurethane foam:

[0041] Polyethylene glycol 400 100 parts

[0042] Corn cob lignin 5 parts

[0043] 2 parts triethylenediamine

[0044] 0.1 parts of water

[0045] HCFC-141B 23 parts

[0046] 2 parts simethicone

[0047] PM-200 170 parts

[0048] Mix the other raw materials except PM-200 in the above raw material formula evenly under the electric mixer, then add PM-200 to it, stir quickly under the electric mixer, pour it into the mold preheated to 40-50℃, Foaming is carried out to obtain rigid polyurethane foam. The thermal conductivity of the obtained sample is 0.0215w / m·k (25°C), the closed cell rate is 91.2%, and the compressive strength is 205.43Kpa.

Embodiment 3

[0050] raw material:

[0051] Polyethylene glycol 600 100 parts

[0052] Corn cob lignin 10 parts

[0053] 2 parts triethylenediamine

[0054] Cyclopentane 30 parts

[0055] Silicone oil 2 parts

[0056] 5005 150 copies

[0057] Mix the other raw materials except 5005 in the above raw material formula evenly under the electric mixer, then add 5005 to it, stir quickly under the electric mixer, pour it into the mold preheated to 40-50 ℃, and start foaming. Obtain rigid polyurethane foam. The thermal conductivity of the obtained sample is 0.0223w / m·k (25°C), the closed cell rate is 90.8%, and the compressive strength is 200.19Kpa.

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Abstract

The invention relates to the technical field of reutilization of corn cob, and particularly relates to corn cob lignin. The corn cob lignin is obtained filtering a corn cob black liquid obtained by separating hemicelluloses and celluloses from the corn cob; adjusting a pH value of the filtrate to 2.5-4.5 so as to allow the corn cob lignin to be precipitated; cooling to a room temperature; centrifuging; washing and drying. The invention also relates to an application of the corn cob lignin in preparation of polyurethane foams. The obtained lignin has high purity, retains chemical activity of natural lignin well, and is more suitable for being used as a polyhydric alcohol to replace polyether polyol to prepare the polyurethane foams than other lignin. The corn cob lignin can not only reduce production cost of the polyurethane but also change wastes into treasure, realize reutilization and reduce usage amounts of petrochemical materials, thereby benefiting sustainable development of society and economy. The performance of the prepared rigid polyurethane foams can be comparable with or event superior to that of regular rigid polyurethane foams, so that production cost is effectively reduced and competitiveness of a product is increased.

Description

technical field [0001] The invention relates to the technical field of corn cob reuse, in particular to a corn cob lignin, and also relates to the application of the corn cob lignin. Background technique [0002] With the deepening of human understanding of resources and environmental issues, the renewable and degradable nature of natural polymer biomaterials has attracted more and more attention. Lignin is a natural polymer biomaterial, which forms the basic skeleton of plant straw with cellulose and hemicellulose, and is separated as waste during the production process. Recycling of waste can reduce the pollution of waste to the environment, brings new challenges to contemporary science and technology, and has become a major issue in contemporary economic and social development. [0003] Polyol is one of the main raw materials for the synthesis of polyurethane materials. Polyurethane rigid foam has the characteristics of good thermal insulation effect, light weight, hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C08G18/64C08G101/00
Inventor 唐一林江成真张丽伟焦峰
Owner JINAN SHENGQUAN GRP SHARE HLDG CO LTD
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