A kind of preparation method of lignin-modified environment-friendly urea-formaldehyde resin adhesive

An environmentally friendly urea-formaldehyde resin and lignin technology, applied in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve problems such as polluting the indoor environment and threatening human health, and achieve improved environmental protection levels. Market application prospect, effect of reducing consumption

Active Publication Date: 2022-06-24
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, urea-formaldehyde resin will release formaldehyde during use, pollute the indoor environment, and threaten human health

Method used

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  • A kind of preparation method of lignin-modified environment-friendly urea-formaldehyde resin adhesive
  • A kind of preparation method of lignin-modified environment-friendly urea-formaldehyde resin adhesive
  • A kind of preparation method of lignin-modified environment-friendly urea-formaldehyde resin adhesive

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of a lignin-modified environment-friendly urea-formaldehyde resin adhesive, comprising the following steps:

[0043] (1) Weigh 200 g of sodium lignosulfonate, dissolve it in 300 g of water, and mechanically stir it to configure 40 wt.% aqueous solution of lignosulfonate, wherein the ash content of sodium lignosulfonate is 20 %.

[0044] (2) adding 1g laccase to the aqueous lignin solution by the amount of 50U / g aspergillus laccase with enzyme activity of 10000U / g, and adding 2g methyl syringate by 1% of the sodium lignosulfonate quality Esters as mediators. The lignin aqueous solution added with laccase and mediator was adjusted to pH 5.0 with formic acid, and reacted for 4 hours at a water bath temperature of 50 °C with constant stirring during the reaction, and the depolymerized lignin solution was obtained after the reaction was completed.

[0045] (3) Use sodium hydroxide to adjust the pH value of the depolymerized lignin solution after laccas...

Embodiment 2

[0061] A preparation method of a lignin-modified environment-friendly urea-formaldehyde resin adhesive, comprising the following steps:

[0062] (1) Weigh 200 g of sodium lignosulfonate, dissolve it in 600 g of water, and mechanically stir it to configure a 25wt.% aqueous solution of lignosulfonate, wherein the ash content of sodium lignosulfonate is 20 %.

[0063] (2) the white rot fungus laccase that the enzyme activity is 5000U / g adds 2g laccase to the lignin aqueous solution in the amount of 50U / g added, and adds 2g laccase by 1% of the sodium lignosulfonate quality Lanolin as a mediator. The lignin aqueous solution added with laccase and mediator was adjusted to pH 4.5 with formic acid, and reacted for 2 h under the condition of water bath temperature of 45 °C with constant stirring during the reaction, and the depolymerized lignin solution was obtained after the reaction was completed.

[0064] (3) Using sodium hydroxide to adjust the pH value of the depolymerized lign...

Embodiment 3

[0069] A preparation method of a lignin-modified environment-friendly urea-formaldehyde resin adhesive, comprising the following steps:

[0070] (1) Weigh 200 g of sodium lignosulfonate, dissolve it in 800 g of water, and mechanically stir it to prepare a 20wt.% aqueous solution of lignosulfonate, wherein the ash content of sodium lignosulfonate is 20 %.

[0071] (2) adding 2g laccase to the aqueous lignin solution by the amount of 40U / g of laccase for textile with enzyme activity of 4000U / g, and adding 2g of phenothiazine by 1% of the mass of sodium lignosulfonate as a mediator. The lignin aqueous solution added with laccase and mediator was adjusted to pH 4.7 with formic acid, and reacted for 3 hours at a water bath temperature of 55 °C with constant stirring during the reaction, and the depolymerized lignin solution was obtained after the reaction was completed.

[0072](3) Use sodium hydroxide to adjust the pH value of the depolymerized lignin solution after laccase-medi...

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Abstract

The invention discloses a preparation method of a lignin-modified environmental-friendly urea-formaldehyde resin adhesive, which comprises the following steps: (1) dissolving lignosulfonate to obtain a lignin solution, and then adding biological enzymes into the lignin solution Combined with the mediator to depolymerize lignin to obtain a depolymerized lignin solution; (2) adjust the depolymerized lignin solution to be weakly alkaline, and add a silane coupling agent for grafting reaction to obtain a lignin modified solution; (3 ) Adding formaldehyde and urea to the lignin modification solution to react to obtain the lignin modified environmental-friendly urea-formaldehyde resin adhesive. The preparation method of the lignin-modified environment-friendly urea-formaldehyde resin adhesive of the present invention has mild reaction conditions, is environmentally friendly, does not produce pollutants, and grafts and modifies its ash to realize the copolymerization of lignin and ash particles with urea-formaldehyde resin and reduce urea-formaldehyde The amount of formaldehyde used in the resin synthesis process solves the problems of high formaldehyde release and poor environmental protection of urea-formaldehyde resin adhesives.

Description

technical field [0001] The invention belongs to the field of adhesives, and in particular relates to a preparation method of a urea-formaldehyde resin adhesive. Background technique [0002] Lignin is an amorphous polymer composed of phenylpropane units connected by carbon-carbon bonds and ether bonds. It is also a biomass resource second only to cellulose in nature. Globally, more than 25 million tons of lignin are produced annually from papermaking alone. Although lignin contains a large number of active groups such as phenolic hydroxyl groups, alcoholic hydroxyl groups, carbonyl groups, and carboxyl groups, due to its large molecular weight and high degree of polymerization, there are very few active groups exposed in the lignin molecule, resulting in low reactivity of lignin and industrialization. Difficult to apply. In addition, using methods such as chemical modification to activate lignin has high cost, high pollution and low yield. The search for a simple, low-cos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/32C08G12/40
CPCC09J161/32C08G12/40
Inventor 刘明杨守禄吴义强卿彦罗莎李贤军李新功李天华田翠花徐康
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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