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Preparation method of furfural-modified lignin-based phenolic resin adhesive

A phenolic resin glue, lignin-based technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of decreased bonding strength of adhesives and inability to achieve high proportion replacement, etc. To achieve the effect of improving the bonding strength, improving the product purity and increasing the bonding strength

Active Publication Date: 2017-11-10
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of a furfural-modified lignin phenolic resin adhesive, which solves the problems in the prior art that the ratio of lignin to phenol is increased, the bonding strength of the adhesive is reduced, and a high ratio of replacement cannot be achieved

Method used

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  • Preparation method of furfural-modified lignin-based phenolic resin adhesive
  • Preparation method of furfural-modified lignin-based phenolic resin adhesive

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Step 1, preparation of xylose solution

[0043] 1. Mix the biomass with a sulfuric acid solution with a concentration of 2wt% according to a solid-to-liquid ratio of 1Kg:10L, heat and reflux for 2h to 4h, cool down and filter, and obtain a hydrolyzed solution and hydrolyzed slag with a xylose concentration of 6.5wt%;

[0044] ② adjust the concentration of sulfuric acid in the hydrolyzate in ① to be 2wt% with a sulfuric acid solution with a concentration of 3wt%, add biomass by solid-liquid ratio 1Kg:10L, heat and reflux for 3h, cool down and filter, and obtain xylose concentration of 10wt%. Hydrolyzate and hydrolyzed slag;

[0045] ③Adjust the sulfuric acid concentration in the hydrolyzate in ② with a sulfuric acid solution with a concentration of 3wt% to be 2wt%, add biomass according to the solid-to-liquid ratio of 1Kg:10L, heat and reflux for 2h to 4h, cool down and filter, and obtain the xylose concentration of the hydrolyzate 15.6wt% xylose solution and hydrolyzed...

Embodiment 2

[0049] ① Concentrate the hydrolyzed slag in Step 1 of Example 1, wash until neutral, mix it with a sodium hydroxide solution with a concentration of 5wt% at a solid-to-liquid ratio of 1Kg:8L, heat and reflux for 4 hours, drop to room temperature, filter, Obtain alkali lignin solution and crude cellulose;

[0050] ②Add the alkali lignin solution, phenol and alkali catalyst obtained in ① into the reaction device, raise the temperature to 80°C-100°C, and reflux for 0.5h-2h to obtain a phenolic modified alkali lignin solution;

[0051] The mass of lignin in the alkali lignin solution accounts for 40% of the total mass of lignin and phenol, the alkali catalyst is a sodium hydroxide solution, and the mass of active ingredients in the alkali catalyst is 5% of the total mass of lignin and phenol;

[0052] ③ Add formaldehyde solution with a concentration of 37% in batches to the phenolic modified alkali lignin solution obtained in ②, and add 80% of the total amount of formaldehyde solu...

Embodiment 3

[0055] The mass of lignin accounted for 40% of the total mass of lignin and phenol, and the mass of furfural accounted for 10% of the total mass of furfural and formaldehyde. Other conditions were the same as in Example 2, and lignin-based phenolic resin adhesive LPF4010 was obtained.

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Abstract

The invention discloses a preparation method of a furfural-modified lignin-based phenolic resin adhesive and belongs to the technical field of the biomass energy chemical industry. According to the method, a xylose solution is prepared from biomass hemicellulose through hydrolysis under catalysis of diluted acid, furfural is prepared through dehydration of xylose under catalysis of concentrated acid, lignin is extracted under catalysis of alkali, and an alkali lignin solution is obtained; alkali lignin is subjected to phenolation modification with phenol as a phenolation reagent and alkali as a catalyst, phenol is replaced with the modified lignin in different proportions, formaldehyde is replaced with furfural in different proportions, and the lignin-based phenolic resin adhesive is prepared through collaborative copolymerization of lignin, furfural, phenol and formaldehyde. The product furfural prepared through hydrolysis and dehydration of hemicellulose is taken as a crosslinking agent, the industrial application problem that the glue strength of the adhesive is reduced due to the fact that the proportion of lignin replacing phenol is increased in the prior art is solved, and the total replacement rate of chemical products from biomass for phenol and formaldehyde from fossil resources is increased.

Description

technical field [0001] The invention belongs to the field of biomass energy chemical industry, and relates to a preparation method of a furfural-modified lignin-based phenolic resin adhesive. Background technique [0002] The comprehensive utilization of biomass resources and the preparation of biomass fuels and chemicals have attracted widespread attention from all walks of life in the world. The use of hemicellulose to produce xylose and furfural, and the use of cellulose to produce ethanol and papermaking have formed industrialized production. Relatively speaking, the utilization rate of lignin is low, which has become a bottleneck for the comprehensive utilization of biomass resources. For example, the by-product of pulp and paper industry is 50 million tons of lignin every year, only 2% is utilized, and the rest is passively burned. Lignin accounts for 25% to 35% in the organic components of biomass, and the energy content reaches 40%. Therefore, the study of lignin i...

Claims

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Application Information

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IPC IPC(8): C08G8/28C08G8/06C08G8/10C09J161/14C07D307/48C08B11/12
CPCC07D307/48C08B11/12C08G8/06C08G8/10C08G8/28C09J161/14
Inventor 王子忱刘欢朱燕超王晓峰杨晓敏宋丽岩张阅欣
Owner JILIN UNIV
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