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Method for preparing lignin-based environment-friendly phenolic resin adhesive

An environmentally friendly phenolic resin, lignin-based technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve problems such as complex production processes, operational errors, and reduced production efficiency, and achieve production The process is simple, the source of raw materials is extensive, and the effect of good economic value

Active Publication Date: 2014-05-21
HUNAN FORESTECH NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among the preparation methods mentioned in the above patents, the lignin-based phenolic resin adhesives with ideal properties can be obtained by the preparation methods involving lignin activation treatment, but the lignin activation treatment process inevitably increases the production cost, and the production The process is more complicated, and at the same time, the production efficiency is reduced, and the use of unactivated lignin for glue production cannot achieve a high replacement rate
Although it is also mentioned to carry out process design through functional group analysis, the analysis method used is chemical method, which is prone to human error, and the data given does not accurately reflect the number of active sites that can actually participate in the gel-making reaction, which is easy The ratio of raw materials is unreasonable, which eventually leads to serious release of harmful substances in the product

Method used

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  • Method for preparing lignin-based environment-friendly phenolic resin adhesive
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  • Method for preparing lignin-based environment-friendly phenolic resin adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]1) The ratio of phenol, corncob alkali lignin raw material and formaldehyde in this example is: phenol 84.6g, corncob alkali lignin 9.4g, formaldehyde solution 111.90g.

[0041] 2) First add 9.4g of corncob alkali lignin, 84.6g of phenol and 55.95g of the first batch of formaldehyde solution into the three-necked flask, stir evenly, then add the first batch of sodium hydroxide solution (30wt%) 31.33g into the reaction system at an appropriate speed , then raise the temperature of the system to 80°C, and keep it warm for 60 minutes;

[0042] 3) Add the second batch of sodium hydroxide solution 2.61g and the second batch of formaldehyde solution 18.65g at an appropriate speed, and keep warm for 20min at 80°C;

[0043] 4) Add the third batch of formaldehyde solution 18.65g and the third batch of sodium hydroxide solution 5.22g, and the reaction system continues to react at 80°C for 20 minutes;

[0044] 5) Add 18.65g of the fourth batch of formaldehyde solution and 7.83g of...

Embodiment 2

[0048] 1) The ratio of phenol, corn cob lignin and formaldehyde in this example is: 75.2g of phenol, 18.8g of lignin, and 102.16g of formaldehyde solution.

[0049] 2) First add 18.8 corncob alkali lignin, 75.2g phenol and 51.08g of the first batch of formaldehyde solution into the three-necked bottle, stir evenly, then add the first batch of sodium hydroxide solution (30wt%) 31.33g into the reaction system at an appropriate speed, Then raise the temperature of the system to 80°C, and keep it warm for 60 minutes;

[0050] 3) Add the second batch of sodium hydroxide solution 2.61g and the second batch of formaldehyde solution 17.03g at an appropriate speed, and keep warm for 20min at 80°C;

[0051] 4) Add the third batch of formaldehyde solution 17.03g and the third batch of sodium hydroxide solution 5.22g, and the reaction system continues to react at 80°C for 20 minutes;

[0052] 5) Add 17.03g of the fourth batch of formaldehyde solution and 7.83g of the fourth batch of sodi...

Embodiment 3

[0056] 1) The ratio of phenol, corncob lignin and formaldehyde in this example is: 65.8g of phenol, 28.2g of lignin, and 92.42g of formaldehyde solution.

[0057] 2) First add 28.2g of corncob alkali lignin, 65.8g of phenol and 46.21g of the first batch of formaldehyde solution into the three-necked flask, stir evenly, and add the first batch of sodium hydroxide solution (30wt%) 31.33g into the reaction system at an appropriate speed , then raise the temperature of the system to 80°C, and keep it warm for 60 minutes;

[0058] 3) Add the second batch of sodium hydroxide solution 15.67g and the second batch of formaldehyde solution 5.40g at an appropriate speed, and keep warm for 20min at 80°C;

[0059] 4) Add the third batch of formaldehyde solution 15.40g and the third batch of sodium hydroxide solution 2.61g, and the reaction system continues to react at 80°C for 20 minutes;

[0060] 5) Add 15.40g of the fourth batch of formaldehyde solution and 5.22g of the fourth batch of ...

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Abstract

The invention discloses a method for preparing a lignin-based environment-friendly phenolic resin adhesive. The method comprises the following steps: 1, carrying out quantitative analysis on hydroxyl of a lignin material by using a quantitative phosphorus spectrum of nuclear magnetic resonance technology, and obtaining the quantity of active site points in unit mass of lignin material when reacting with formaldehyde by calculating the quantity of phenolic hydroxyl groups and alcoholic hydroxyl groups; 2, mixing the lignin material with phenol to form a material mixture, wherein the mass ratio of the lignin material to the phenol is (1:9)-(8:2) in the mixing process; 3, calculating the gross of formaldehyde; 4, mixing the material mixture obtained in the step 2 with formaldehyde and aqueous alkali for reaction, so as to prepare the lignin-based environment-friendly phenolic resin adhesive. The biomass refined by-product lignin is utilized at high value on the basis that the problems of expensive product and formaldehyde pollution of the traditional lignin-based phenolic resin adhesive are solved, and the method has great economic significance and social significance.

Description

technical field [0001] The invention relates to the technical field of adhesive preparation, in particular to a preparation method of a lignin-based environmental-friendly phenolic resin adhesive. Background technique [0002] Plywood products prepared with phenolic resin adhesives have the advantages of high bonding strength, weather resistance, water resistance and corrosion resistance. However, the price of its raw material phenol is constantly rising with the shortage of petroleum resources, which directly leads to the high price of phenolic resin adhesives. At the same time, due to the unreasonable preparation process of phenolic resin adhesives, a certain amount of formaldehyde will be released during production and use. Formaldehyde can cause various diseases in the human body, such as asthma, bronchitis, dermatitis, etc. Long-term exposure may even cause cause malignant tumors. In addition, the toxicity of phenol as one of the raw materials is relatively high. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08G8/10C09J161/14
Inventor 孙润仓袁同琦杨昇文甲龙
Owner HUNAN FORESTECH NEW MATERIALS CO LTD
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