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Preparation of alkali lignin-phenolic composite adhesive for timber industry

A technology of composite adhesives and wood adhesives, applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesives, adhesive types, etc., can solve the problems of few types of alkali lignin, limited application range, and limited uses, etc., and achieve raw material Inexpensive, abundant sources, large steric hindrance effect

Active Publication Date: 2011-08-31
吉林省东北亚硅藻土应用研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Our country produces tens of thousands of tons of alkali lignin every year, and with the maturity of evaporation concentration and spray drying technology, the annual output of alkali lignin increases year by year. The range is limited, and it is insoluble in acidic conditions, which further limits its use. So far, there is no large-scale specific application path

Method used

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  • Preparation of alkali lignin-phenolic composite adhesive for timber industry
  • Preparation of alkali lignin-phenolic composite adhesive for timber industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The first step: preparation of hydroxymethylated alkali lignin:

[0020] 1): Add 40g of formaldehyde solution, 110g of the first batch of alkali lignin, and 170g of water into a 500ml four-neck flask, adjust the pH to 11 with lye, heat up to 85°C, and react for 80min.

[0021] 2): Add 73g of the second batch of alkali lignin, and add a certain amount of lye to ensure that its pH value is the same as that of step 1, and react at 85°C for 70min.

[0022] 3): Add 37g of the third batch of alkali lignin, and add a certain amount of lye to make the pH value the same as step 1, and react at 85°C for 60min. Cool the discharge. Test their performance respectively, and the results are listed in attached table 2.

[0023] The second step: the preparation of alkali lignin-phenolic resin composite adhesive:

[0024] At room temperature, mix the hydroxymethylated alkali lignin prepared in the first step with the resole phenolic resin according to 3:7, 2:3, and 1:1 (mass ratio) re...

Embodiment 2

[0026] The first step: preparation of hydroxymethylated alkali lignin:

[0027] 1): Add 40g of formaldehyde solution, 110g of the first batch of alkali lignin, and 170g of water into a 500ml four-necked flask, adjust the pH value to 12 with lye, raise the temperature to 80°C, and react for 70min.

[0028] d2): add the second batch of alkali lignin 73g, and add a certain amount of lye to ensure that its pH value is the same as step 1, and react at 80°C for 60min.

[0029] 3): Add 37g of the third batch of alkali lignin, and add a certain amount of lye to make the pH value the same as step 1, and react at 80°C for 50min. Cool the discharge. Test their performance respectively, and the results are listed in attached table 2.

[0030] The second step: the preparation of alkali lignin-phenolic resin composite adhesive:

[0031] At room temperature, mix the hydroxymethylated alkali lignin prepared in the first step with the resole phenolic resin according to 3:7, 2:3, and 1:1 (ma...

Embodiment 3

[0033] The first step: preparation of hydroxymethylated alkali lignin:

[0034]1): Add 40g of formaldehyde solution, 110g of the first batch of alkali lignin, and 170g of water into a 500ml four-neck flask, adjust the pH value to 13 with lye, raise the temperature to 80°C, and react for 70min.

[0035] 2): Add 73g of the second batch of alkali lignin, and add a certain amount of lye to ensure that its pH value is the same as that of step 1, and react at 80°C for 60min.

[0036] 3): Add 37g of the third batch of alkali lignin, and add a certain amount of lye to make the pH value the same as step 1, and react at 80°C for 50min. Cool the discharge. Test their performance respectively, and the results are listed in attached table 2.

[0037] The second step: the preparation of alkali lignin-phenolic resin composite adhesive:

[0038] At room temperature, mix the hydroxymethylated alkali lignin prepared in the first step with the resole phenolic resin according to 3:7, 2:3, and ...

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Abstract

The invention relates to a method for preparing an alkali lignin-phenolic resin composite adhesive for wood adhesive, which comprises the steps that hydroxymethylation alkali lignin is prepared; and the alkali lignin-phenolic resin composite adhesive is prepared. The method adopts hydroxymethyl reaction to improve the activation of alkali lignin; the hydroxymethylation alkali lignin is prepared; lignin is selected and added by three batches; the batch addition of the lignin can achieve the function of adjusting the degree of the hydroxymethyl reaction, contribute to the realization of the hydroxymethyl reaction, reduce the condensation reaction between lignin hydroxymethyls and achieve the aim of the farthest activation of the lignin. In the synthetic process, the PH value and viscosity in the reaction are strictly controlled; and the batch feeding method is used to carry out orderly and rapid hydroxymethyl reaction. As the lignin has huge molecular weight, large space steric hindrance of the active site on aromaticring and low reaction activity, the lignin is needed to be modified so as to improve the reaction activity; as a molecule comprises a phenolic hydroxyl, the ortho-position and the para-position of the molecule have certain activity; and hydrogen in the alpha-carbon atom can be replaced by hydroxymethyl to have the hydroxymethylation reaction, thereby introducing a hydroxymethyl active group in the molecule.

Description

1. Technical field [0001] The invention relates to a preparation method of wood adhesive, in particular to a preparation method of alkali lignin modified phenolic resin. 2. Background technology [0002] Plywood pressed with phenolic resin has excellent properties, such as high bonding strength, good water resistance and weather resistance, but its raw material phenol is a petrochemical product. With the continuous rise and scarcity of petroleum resource prices, it has become a key problem to be solved urgently to find the use of renewable resources instead of petroleum products as raw materials for the preparation of adhesives. [0003] Lignin is one of the most abundant renewable resources in nature. Lignin molecules contain aldehyde groups and a large number of phenol structural units, so lignin can react with aldehydes as phenols under alkaline conditions, and can react with phenols as aldehydes under acidic conditions. Moreover, lignin is renewable, degradable, and no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/06C09J197/00
Inventor 储富祥穆有炳王春鹏赵临五金立维
Owner 吉林省东北亚硅藻土应用研究有限公司
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