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Plant fiber component-based polyalcohol and preparation method thereof

Inactive Publication Date: 2012-03-21
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The common disadvantage of the above technologies is that the plant fiber raw materials contain three main components, cellulose, hemicellulose and lignin, and their chemical structures are quite different, resulting in significant differences in the behavior of reacting with liquefaction reagents.
These components may have various effects on liquefaction, and the composition of liquefied products is correspondingly complex
If chemical pulp is used as raw material for liquefaction, the source of raw material is limited and the price is high, which is not conducive to promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Component splitting of plant fiber raw materials: Take 100g of corn cob powder that has been crushed to 10-20 mesh and add it to 400g of 8% potassium hydroxide solution by mass fraction, react at 50°C for 3h, and separate the solid residue after the reaction and aqueous solution, the obtained solid was reacted at 80°C for 3 hours with a mass fraction of 1% sodium hydroxide solution, then washed with water until the pH was 6, and dried at 80°C to obtain low-purity cellulose; and the mass fraction of the liquid obtained from the reaction was Adjust the pH to 2 with 1% sulfuric acid, collect the precipitated lignin and wash it with water until the pH is 6, and dry at 80°C to obtain dry lignin; (2) Liquefaction of low-purity cellulose: 10g polyethylene glycol 800 , 10g ethylene glycol, and 0.02g sulfuric acid were mixed evenly, heated to 100°C, and then 20g of dry low-purity cellulose prepared in step (1) was added in liquefaction reagent in 2 times, each feeding 10g; th...

Embodiment 2

[0034] (1) Component splitting of plant fiber raw materials: Take 100g of corn stalks that have been crushed to 50-60 mesh, add them to 1000g of potassium hydroxide solution with a mass fraction of 6%, react at 40°C for 2.5h, and separate after the reaction Solid residue and aqueous solution, the obtained solid was reacted with 5% sodium hydroxide solution at 70°C for 4.5h, then washed with water until the pH was 7, and dried at -5°C to obtain low-purity cellulose; % sulfuric acid to adjust the pH to 4, collect the precipitated lignin and wash it to pH 7, and dry at -5°C to obtain dry lignin; (2) liquefaction of low-purity cellulose: 99g of polyethylene glycol 200, 1g of propylene glycol and 0.1g of hydrochloric acid were mixed evenly, heated to 110°C, and then 20g of dry low-purity cellulose prepared in step (1) was added into the liquefaction reagent in 3 times, 10g was added for the first time, and 10g was added for the second time. Add 6g for the first time, add 4g for the...

Embodiment 3

[0036] (1) Component resolution of plant fiber raw materials: Take 100g of bagasse powder that has been crushed to 80-90 meshes and add it to 2000g of potassium hydroxide solution with a mass fraction of 2%, and react at 70°C for 1h. Separate the solid residue and the aqueous solution, react the obtained solid with 3% sodium hydroxide solution at 130°C for 1 hour, wash with water until the pH is 8, and dry at 70°C to obtain dry low-purity cellulose; The pH of the liquid part was adjusted to 1 with 2% hydrochloric acid, and the precipitated lignin was collected and washed with water until the pH was 8, and dried at 70° C. to obtain dry lignin; (2) Liquefaction of low-purity cellulose: 50 g of polyethylene Diol 400, 10g glycerol, and 0.2g phosphoric acid were mixed evenly to obtain a liquefaction reagent; the liquefaction reagent was heated to 120°C, and then 20 g of dry low-purity cellulose prepared in step (1) was added to the liquefaction reagent in 4 times 8g was added for t...

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Abstract

The invention discloses plant fiber-based polyalcohol, a preparation method and application. The preparation method comprises the following two steps of: (1) splitting components of a plant fiber raw material; and (2) liquefying low-purity cellulose. The viscosity of the prepared plant fiber-based polyalcohol is 1,000 to 10,000mPa.s, the hydroxyl value is between 200 and 500mg KOH / g, and the plant fiber-based polyalcohol can be used for producing polyurethane hard foam and semi-hard foam. The preparation method has the advantages that: the components of the plant fiber raw material are split so as to simplify the raw material components, simplify the reaction, reduce side reaction and improve the specificity of the liquefaction reaction; the fiber is more loose and is favorable for osmosis of a liquefying reagent; the composition complexity of the obtained liquefied product is reduced so as to facilitate subsequent utilization of the plant-based polyalcohol; the proportion of a liquefied product of lignin to a liquefied product of cellulose can be flexibly adjusted as required; and the hemicellulose and the lignin obtained by separation also can be continuously utilized so as to improve the utilization value.

Description

technical field [0001] The invention relates to a polyol based on plant fiber components and a preparation method thereof, more specifically, to a polyether polyol for preparing polyurethane based on a split product of plant fiber raw material components and a preparation method thereof, belonging to high field of molecular chemistry. Background technique [0002] Polyurethane is a class of polymers with urethane repeating structural units, which can be divided into elastomers, foams, adhesives, etc. according to their functions. Polyurethane is widely used in industrial fields such as transportation, metallurgy, construction, plastics, printing and dyeing, and its usage is constantly increasing. [0003] Polyurethanes are synthesized from polyols and isocyanates. This polyol compound contains two or more hydroxyl groups in its molecule. The polyols used to produce polyurethane include polyether polyols, polyester polyols, and polyether ester polyols containing the chemic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08H8/00
Inventor 谌凡更朱俐静冯清华
Owner SOUTH CHINA UNIV OF TECH
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