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Method for preparing environmentally-friendly adhesive for lignin-based timber

A lignin-based, lignin-based technology, which is applied in the field of preparation of low-cost and environment-friendly lignin-modified phenolic resins, can solve problems such as high free phenol content, few lignin varieties, and poor performance, and achieve increased bonding density, The effect of increasing the crosslink density and increasing the bonding strength

Active Publication Date: 2011-05-18
青岛生物能源与过程研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101260283 has proposed a kind of preparation method of the phenolic adhesive based on lignin phenolization liquid, although it has lower cost and lower free aldehyde content, but the free phenol content is higher in the system, because needs to carry out phenolization to lignin Modification, the whole rubber-making process has high requirements on equipment, which is not conducive to popularization and application
CN101260283, CN101492522 all propose a kind of preparation method based on alkali lignin to prepare modified phenolic resin, although the resin free formaldehyde of preparation, free phenol are all lower, the formaldehyde release amount of the pressed plywood also can reach E 0 Grade requirements, but the lignin added in the system is less, only 30%, and the lignin cannot be fully utilized
[0006] my country produces tens of thousands of tons of industrial lignin every year, but due to the lack of deep processing, there are few types of lignin produced, poor performance, and its application range is limited. So far, there is no large-scale specific application path

Method used

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  • Method for preparing environmentally-friendly adhesive for lignin-based timber
  • Method for preparing environmentally-friendly adhesive for lignin-based timber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Add 100g of phenol, 100g of alkali lignin, 70g of the first batch of formaldehyde solution, 10g of the first batch of lye, and 140g of water into a 500ml four-neck flask, heat up to 80°C, and react for 80min; add the second batch of formaldehyde solution 60g, The reaction was continued for 60 minutes; the third batch of formaldehyde solution 60 g was added, and the reaction was continued for 60 minutes.

[0033] 2) Cool down to 70°C, add 8g of urea and 30g of the second batch of lye, and react at 65°C for 30min.

[0034] 3) Cool down to 30°C, add 20g of polyamide epichlorohydrin resin, stir for 20min, cool and discharge. Test their performance respectively, and the results are listed in attached table 2. Press poplar plywood, test its performance, the results are listed in attached table 3.

Embodiment 2

[0036] 1) Add 100g of phenol, 100g of alkali lignin, 75g of the first batch of formaldehyde solution, 10g of the first batch of lye, and 140g of water into a 500ml four-neck flask, heat up to 85°C, and react for 60min; add the second batch of formaldehyde solution 60g, The reaction was continued for 40 minutes; the third batch of formaldehyde solution 60 g was added, and the reaction was continued for 40 minutes.

[0037] 2) Cool down to 70°C, add 10g of urea and 30g of the second batch of lye, and react at 65°C for 30min.

[0038] 3) Cool down to 30°C, add 40g of polyamide epichlorohydrin resin, stir for 30min, cool and discharge. Test their performance respectively, and the results are listed in attached table 2. Press poplar plywood, test its performance, the results are listed in attached table 3.

Embodiment 3

[0040] 1) Add 100g of phenol, 100g of alkali lignin, 80g of the first batch of formaldehyde solution, 10g of the first batch of lye, and 140g of water into a 500ml four-neck flask, heat up to 80°C, and react for 80min; add the second batch of formaldehyde solution 60g, The reaction was continued for 60 minutes; the third batch of formaldehyde solution 60 g was added, and the reaction was continued for 60 minutes.

[0041] 2) Cool down to 70°C, add 4g of urea and 4g of polyvinyl alcohol, 30g of the second batch of lye, and react at 65°C for 30min.

[0042] 3) Cool down to 30°C, add 40g of polyethyleneimine resin, stir for 30min, cool and discharge. Test their performance respectively, and the results are listed in attached table 2. Press poplar plywood, test its performance, the results are listed in attached table 3.

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Abstract

The invention discloses a method for preparing an environmentally-friendly adhesive for a lignin-based timber. The method comprises the following steps of: 1) adding phenol, formaldehyde solution, lignin, first alkali liquor and diluting water into a reactor, heating to the temperature of between 75 and 85 DEG C and reacting for 2.5 to 3.5 hours, wherein the molar ratio of formaldehyde to the phenol is 2.20:1-2.40:1; the formaldehyde solution is added for three times in a mass ratio of 1.5 to 1.0 to 1.0; and the reaction time ratio of the added formaldehyde solution is 1.2 to 1.0 to 1.0; 2) cooling to 70 DEG C, adding a formaldehyde collector and second alkali liquor, and reacting at the temperature of between 65 and 70 DEG C for 20 to 50 minutes; and 3) cooling to the temperature of between 30 and 40 DEG C, adding an intensifier, stirring for 10 to 30 minutes, cooling and discharging. In the method, a 50 to 60 percent petroleum-based phenol raw material can be substituted; the methodis stable in reaction, easy to control and easy for industrial production; formaldehyde emission of a plywood reaches E0 level; adhesive strength meets the requirements of national class I plates; and a new approach is provided for the development of an environmentally-friendly biomass-based timber adhesive and recycling of wastes.

Description

technical field [0001] The invention relates to a preparation method of a wood adhesive that can be used outdoors, in particular to a preparation method of a low-cost environment-friendly lignin-modified phenolic resin. Background technique [0002] With the increase of people's awareness of environmental protection, the release of formaldehyde from wood-based panels has attracted much attention. Many countries have made regulations on the formaldehyde concentration allowed by the environment, and then made strict regulations on the formaldehyde emission of wood-based panels, such as: my country and Europe's E 0 Class, Japanese F ☆☆☆☆ , CARB regulations in the United States. In order to meet the market requirements of wood-based panels, many wood-based panel companies and related scientific research institutes are working on the development of low-formaldehyde emission and zero-formaldehyde emission wood-based panels. [0003] The formaldehyde emission of wood-based panel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/06
Inventor 康宁穆有炳宫瑞英姜飞李建忠
Owner 青岛生物能源与过程研究所
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