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Modified acetic acid lignin polyurethane adhesive and preparation method thereof

A technology of polyurethane adhesive and lignin acetate, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problem of low lignin activity, achieve increased reactivity, less structural change, cheap to produce effects

Inactive Publication Date: 2019-07-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the lignin it uses comes from the industrial by-product "black liquor", which has low lignin activity and does not involve lignin modification

Method used

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  • Modified acetic acid lignin polyurethane adhesive and preparation method thereof
  • Modified acetic acid lignin polyurethane adhesive and preparation method thereof
  • Modified acetic acid lignin polyurethane adhesive and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] (1) Refining of acetic acid lignin: use 100ml of benzene-alcohol mixed solution (composed of benzene and ethanol with a volume ratio of 2:1) with 30g of ground and sieved eucalyptus lignin raw material in a water bath or oil bath Extract at 80°C for 8 hours; take out the biomass raw material, stir and dissolve it with 250ml of 95% acetic acid solution and cook it for 6 hours. block, filter to remove the residue; use G2 sand core funnel to filter to obtain the filtrate; add the filtrate dropwise to 2.5L of 70°C deionized water to fully disperse and precipitate the lignin; when separating the precipitate, use 70°C deionized water 200ml, wash repeatedly 5-6 times until the filtrate is translucent, light yellow and nearly colorless, and the pH is close to 7; put the separated precipitate in a vacuum drying oven at 40°C for 24 hours, put phosphorus pentoxide to absorb water; finally crush, pass through a 160-mesh sieve, Take the sieved sieve to obtain refined acetate lignin ...

Embodiment 2

[0049] (1) Refining of acetic acid lignin: 50g of ground and sieved eucalyptus lignin raw material is used in water bath or oil bath condition, using 200 mass parts of benzene-alcohol mixed solution (from benzene and ethanol with a volume ratio of 2:1 Composition) extract at 80°C for 8 hours; take out the biomass raw material, stir and dissolve it with 500ml of 95% acetic acid solution and cook for 6 hours; after cooking, filter with suction and concentrate the filtered black liquor until the black liquor becomes slightly viscous and No agglomeration, filter to remove the residue; filter with a G2 sand core funnel to obtain the filtrate; add the filtrate dropwise to 5L of 70°C deionized water to fully disperse and precipitate the lignin; when separating the precipitate, use a 70°C deionized Wash with 400ml of water for 5-6 times until the filtrate is translucent, light yellow and nearly colorless, and the pH is close to 7; put the separated precipitate in a vacuum oven at 40°C ...

Embodiment 3

[0054] (1) Refining of acetic acid lignin: 80g of ground and sieved eucalyptus lignin raw material is used in water bath or oil bath condition, using 250 mass parts of benzene alcohol mixed solution (by volume ratio is 2:1 benzene and ethanol Composition) extract at 80°C for 8 hours; take out the biomass raw material, use 1L of 95% acetic acid solution to stir and dissolve, and cook for 6 hours; after cooking, filter with suction, and concentrate the filtered black liquor until the black liquor becomes slightly viscous and No agglomeration, filter to remove the residue; filter with a G2 sand core funnel to obtain the filtrate; add the filtrate dropwise to 8L of 70°C deionized water to fully disperse and precipitate the lignin; when separating the precipitate, use a 70°C deionized Wash with 600ml of water for 5-6 times until the filtrate is translucent and light yellow and close to colorless, and the pH is close to 7; put the separated precipitate in a vacuum oven at 40°C for 24...

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Abstract

The invention discloses a modified acetic acid lignin polyurethane adhesive and a preparation method thereof and belongs to the field of polyurethane adhesive preparation. The method includes following steps: (1), subjecting acetic acid lignin to hydroxylation modifying to obtain hydroxylated acetic acid lignin; (2), allowing hydroxylated acetic acid lignin to react with an amination reagent to obtain multi-hydroxy aminated acetic acid lignin; (3), copolymerizing lignin after being modified twice with polyols, isocyanate and catalyst which are metered well to obtain a high-strength polyurethane adhesive material. The problem that lignin is low in reaction activity and few in reaction site and the problem that polyurethane adhesives are high in cost and difficult in degradation are solved.The polyurethane adhesive has good mechanical performance and adhesiveness, needed biomass is extensive in raw material source, the polyurethane adhesive is environment-friendly and degradable, and high-value utilization of lignin is realized.

Description

technical field [0001] The invention belongs to the field of polyurethane adhesive preparation, and in particular relates to a modified acetate lignin polyurethane adhesive and a preparation method thereof. Background technique [0002] Lignin (Lignin) is the second largest biomass resource in nature after cellulose in quantity. It exists widely in the plant kingdom. About 15-30% of wood is lignin, and the content in annual plants is about 12. ~20%. According to statistics, about 60 billion tons of lignin are produced on the earth every year. Lignin is the only biomass with aromatic groups in nature, but it can achieve biodegradation, which is extremely environmentally friendly. Lignin is a phenolic macromolecule with a complex structure that varies significantly depending on the plant species and isolation process, and also contains a variety of different functional groups, such as alcoholic and phenolic hydroxyl groups, giving it excellent thermal stability and antioxidan...

Claims

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Application Information

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IPC IPC(8): C09J175/08C08G18/64C08H7/00
CPCC08G18/6492C08H6/00C09J175/08
Inventor 付时雨陈鄞琛张晖
Owner SOUTH CHINA UNIV OF TECH
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