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Lignin-phenol-urea-formaldehyde co-condensation resin adhesive and preparation method

A technology of copolycondensation resin and lignin, applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesives, adhesive types, etc. The effect of stability, wide scope of application, and potential of large commercial chemical industry

Active Publication Date: 2016-01-20
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The world produces about 150-180 million tons of industrial lignin every year, and most of these industrial lignins are used as heat sources, and less than 1% are reused as useful chemical products, which not only causes environmental pollution, but also damages valuable resources. great waste of
It is also possible to add phenol as a modifier in the later stage of synthesis of lignin-modified urea-formaldehyde resin. Similarly, the phenol added in the later stage cannot achieve the purpose of co-condensation, and the resulting product has certain problems.
[0005] At present, there is no related technology of using lignin, phenol, urea and formaldehyde to co-condense to prepare environmentally friendly adhesives with high proportion of lignin and good comprehensive performance.

Method used

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  • Lignin-phenol-urea-formaldehyde co-condensation resin adhesive and preparation method

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preparation example Construction

[0036] This preparation method mainly comprises the following steps:

[0037] Step 1: Mix the first batch of urea with the first batch of formaldehyde solution, add a pH regulator to the mixture, make the mixture react under the first basic condition and the first temperature, and obtain the first-stage reaction product.

[0038] Wherein, the first batch of formaldehyde solution is preferably a formaldehyde solution with a mass concentration of 37%. The pH regulator preferably uses 10% sodium hydroxide solution; under the first alkaline condition, it means that the pH value of the mixture is 7.5-8.0; the range of the first temperature is 80-85°C, preferably 80°C; the first batch The reaction time of urea and the first batch of formaldehyde solution at the first temperature is 0.5-1.5h, preferably 1h.

[0039]Step 2: Add a pH adjuster to the first-stage reaction product, adjust the pH of the first-stage product to 10.5-11.5, then add lignin, react at a second temperature, and ...

Embodiment 1

[0056] (1) Add 30g of the first batch of urea and 81g of the first batch of formaldehyde solution to the reaction vessel to form a reaction system, heat the reaction system to 80°C, and use a 10% NaOH solution to make the pH of the reaction system Keep the temperature at 7.5-8.0 and keep it warm for 1 hour to obtain the reaction product of the first stage.

[0057] (2) Use 10% NaOH solution to quickly adjust the pH of the system to 11, add 47g of corncob alkali lignin to the first-stage reaction product in step (1), and continue to react at 80°C for 0.5h. During this period, 33.07 g of the first batch of 30wt% NaOH solution was added dropwise at an appropriate speed to obtain the second-stage reaction product.

[0058] (3) Add 47g of phenol and 40.5g of formaldehyde solution in the second step to the second-stage reaction product obtained in the previous step, and react at 80°C for 0.5h, during which the second batch of 30wt% NaOH is added dropwise at an appropriate speed The...

Embodiment 2

[0063] (1) Add 30g of the first batch of urea and 81g of the first batch of formaldehyde solution to the reaction vessel to form a reaction system, heat the reaction system to 80°C, and use a 10% NaOH solution to make the pH of the reaction system Keep at 7.5-8.0, keep warm for 1 hour, and obtain the first-stage reaction product.

[0064] (2) Use a 10% NaOH solution to quickly adjust the pH of the reaction system to 11, and add 47g of corncob alkali lignin to the first-stage reaction product, and continue to react at 85°C for 0.5h, during which time, at an appropriate speed The first batch of 30wt% NaOH solution 33.07g was added dropwise to obtain the second stage reaction product.

[0065] (3) Add 47g of phenol and 40.5g of the second batch of formaldehyde solution to the second-stage reaction product, and react at 85°C for 0.5h, during which the second batch of 30wt% NaOH solution 16.53g is added dropwise at an appropriate speed to obtain the second batch of Three-stage rea...

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Abstract

The invention provides a lignin-phenol-urea-formaldehyde polycondensated resin adhesive and a preparation method. The preparation method is carried out by means of controlling addition and condensation reaction step by step, and comprises the following steps: firstly, reacting first-batch urea with a first-batch formaldehyde solution in an alkaline medium to obtain a first-stage reaction product; reacting the first-stage reaction product with lignin in an alkaline medium to obtain a second-stage reaction product; reacting the second-stage reaction product with phenol and a second-batch formaldehyde solution in the alkaline medium to obtain a third-stage reaction product; reacting the third-stage reaction product with a third-batch formaldehyde solution in the alkaline medium to obtain a fourth-stage reaction product; and reacting the fourth-stage reaction product with a second-batch urea in the alkaline medium to obtain the adhesive. The strength of the prepared adhesive can meet the strength requirement on national I-class plates, the emission amount of the formaldehyde meets the E0-level limit requirement, the addition ratio of the lignin is high, the preparation method is low, and thus great economic and social significance can be achieved.

Description

technical field [0001] The invention relates to the field of wood adhesive preparation, in particular to a lignin-phenol-urea-formaldehyde co-condensation environmentally friendly resin adhesive and a preparation method thereof. Background technique [0002] The world produces about 150-180 million tons of industrial lignin every year, and most of these industrial lignins are used as heat sources, and less than 1% are reused as useful chemical products, which not only causes environmental pollution, but also damages valuable resources. a great waste. For the pulp and paper industry and related biorefining enterprises, the unreasonable use of lignin by-products will lead to a great waste of the remaining production capacity of the enterprise, affecting the overall efficiency and sustainable development of the enterprise. As a phenolic compound with a huge content in nature, lignin is regarded as a potential substitute for petrochemical resources. A large number of researcher...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G14/12C08G14/08C09J161/34
Inventor 孙润仓袁同琦杨昇文甲龙
Owner BEIJING FORESTRY UNIVERSITY
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