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Method for preparing lignin-based adhesive

A lignin-based and lignin-based technology, which is applied in the field of preparation of low-cost formaldehyde-free lignin-based adhesives, can solve the problems of weak market competitiveness and high cost, and achieve great economic significance, low cost, and pollution reduction effects

Inactive Publication Date: 2013-04-10
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN100478375 has reported a kind of preparation method of lignin-modified waterborne polyurethane that can be used for adhesive, and its performance is excellent, does not contain volatile aldehyde, but its cost is higher, and market competitiveness is weak

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Add 67g of glyoxal solution, 100g of the first batch of alkali lignin, and 130g of water into a 500ml four-neck flask, adjust the pH to 12 with lye, raise the temperature to 80°C, and react for 75min. Add the second batch of alkali lignin 70g, and add a certain amount of lye to ensure the same reaction pH value, and react at 80°C for 60min. Add 31g of the third batch of alkali lignin, and add a certain amount of lye to ensure the same reaction pH value, and react at 80°C for 50min. Cool the discharge.

[0027] 2) Cool down to 50°C, add 8g of urea, and react at 50°C for 30min.

[0028] 3) Cool down to 30°C, add 4g of γ-aminopropyltriethoxysilane and 20g of polyamide epichlorohydrin resin, stir for 20min, and cool to discharge. 1.5

Embodiment 2

[0030] 1) Add 55g of glyoxal solution, 110g of the first batch of enzymatically hydrolyzed lignin, and 150g of water into a 500ml four-neck flask, adjust the pH to 13 with lye, raise the temperature to 80°C, and react for 75min. Add 73g of the second batch of enzymatically hydrolyzed lignin, and add a certain amount of lye to ensure the same reaction pH value, and react at 80°C for 60min. Add 37g of the third batch of enzymatically hydrolyzed lignin, add a certain amount of lye to ensure the same reaction pH value, and react at 80°C for 50min. Cool the discharge.

[0031] 2) Cool down to 50°C, add 11g of urea, and react at 50°C for 30min.

[0032] 3) Cool down to 30°C, add 11g of γ-glycidyl etheroxypropyltrimethoxysilane and 15g of polyamide epichlorohydrin resin, stir for 20min, and cool to discharge.

Embodiment 3

[0034]1) Add 60g of glyoxal solution, 110g of the first batch of lignosulfonate, and 150g of water into a 500ml four-neck flask, adjust the pH to 11 with lye, raise the temperature to 80°C, and react for 75min. Add the second batch of lignosulfonate 73g, and add a certain amount of lye to ensure the same reaction pH value, and react at 80°C for 60min. Add the third batch of lignosulfonate 37g, and add a certain amount of lye to ensure the same reaction pH value, and react at 80°C for 50min. Cool the discharge.

[0035] 2) Cool down to 50°C, add 8g of urea, and react at 50°C for 30min.

[0036] 3) Cool down to 30°C, add 5g of γ-glycidyl etheroxypropyltrimethoxysilane and 20g of polyethyleneimine resin, stir for 20min, and cool to discharge.

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Abstract

The invention discloses a method for preparing a lignin-based adhesive, comprising the steps of (1) mixing lignin and glyoxal in the mass ratio of (3-20):1, adding dilution water to ensure that the solid content of the whole reaction system is within 50%, adding alkali liquor to regulate the pH value to 11-13, heating to 75-85 DEG C and reacting, wherein lignin is added in 3 batches and the ratio of the reaction time after each batch of lignin is added is 1.5:1.2:1; (2) cooling to 50-60 DEG C, and adding urea accounting for 3-5% by consumption of lignin and reacting; and (3) cooling to 30-35 DEG C, adding a coupling agent accounting for 2-5% by consumption of lignin and a reinforcing agent accounting for 5-20% by consumption of lignin, reacting, cooling and discharging. The method disclosed by the invention has the advantages of simple process, good reproducibility, good resin stability, long storage period and low cost; and the prepared lignin-based adhesive has the advantages that the lignin content can be up to 30-50% and the pressed plywood board meets the requirement of national II-level boards in the aspect of the bonding strength.

Description

technical field [0001] The invention relates to a preparation method of a wood adhesive, in particular to a preparation method of a low-cost formaldehyde-free lignin-based adhesive. Background technique [0002] Although the appearance of wood-based panels has largely alleviated the concerns of the lack of wood resources in the development of human society, its own shortcomings (release of formaldehyde) have become increasingly popular in today's society with the theme of "green environmental protection, natural health". increasingly prominent. The formaldehyde released from wood-based panels can cause serious respiratory diseases and induce human cancer. For this reason, many countries have formulated strict regulations on the amount of formaldehyde released from wood-based panels, such as: my country and Europe's E 0 Level, F**** in Japan, and CARB regulations in the United States. [0003] The formaldehyde emission of wood-based panels mainly comes from the adhesive use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J197/00C08H7/00
Inventor 万晓波穆有炳
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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