Lignin biomass adhesive, preparation method thereof and plywood
By preparing a lignin biomass adhesive, the problem of high environmental protection and cost of existing plywood is solved by mixing lignin with phenolic resin adhesive, resulting in plywood that is highly environmentally friendly, low in cost, and has excellent performance.
Patent Information
- Application Number
- CN202511005071.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-21
- Publication Date
- 2025-11-11
AI Technical Summary
Existing plywood uses urea-formaldehyde and phenolic resin adhesives, which are environmentally unfriendly. Furthermore, phenolic resin adhesives rely on petrochemical products and are expensive, making them unsuitable for applications requiring high weather resistance, such as container flooring.
A method for preparing lignin biomass adhesives involves activating lignin with water, sodium hydroxide, and polyacrylamide to obtain an activated solution, which is then mixed with phenolic resin adhesive. The amount of activated solution added is less than or equal to 60% of the weight of the phenolic resin adhesive, resulting in an environmentally friendly and low-cost lignin biomass adhesive.
A highly environmentally friendly and low-cost lignin biomass adhesive has been developed, which can achieve the performance indicators of Class I plywood, enhance bonding strength, and reduce formaldehyde emissions.
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Abstract
Description
Technical Field
[0001] This application relates to the field of materials technology, and more specifically to a lignin biomass adhesive and its preparation method, and plywood. Background Technology
[0002] Existing plywood commonly uses urea-formaldehyde resin and phenolic resin adhesives, with a very small number of products using formaldehyde-free adhesives. Among these, urea-formaldehyde resin and phenolic resin adhesives have poor environmental performance, and for plywood with high weather resistance requirements, such as when used in container flooring, urea-formaldehyde resin and formaldehyde-free adhesives cannot meet the requirements. Therefore, phenolic resin adhesives are usually used in products with high weather resistance requirements.
[0003] However, phenolic resin adhesives heavily rely on petrochemical products, are not environmentally friendly, are non-renewable, and are expensive.
[0004] Therefore, there is a need for a lignin biomass adhesive and its preparation method, as well as plywood, to at least partially solve the above problems. Summary of the Invention
[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.
[0006] To at least partially solve the above problems, a first aspect of this application provides a method for preparing a lignin biomass adhesive, the method comprising:
[0007] The lignin activation treatment step involves mixing water, sodium hydroxide, polyacrylamide, and lignin for activation to obtain an activation solution.
[0008] In the mixing step, the activating liquid and phenolic resin adhesive are mixed evenly to obtain lignin biomass adhesive, wherein the amount of activating liquid added is less than or equal to 60% of the weight of the phenolic resin adhesive.
[0009] According to the preparation method of the lignin biomass adhesive of this application, the obtained lignin biomass adhesive is highly environmentally friendly, can meet the performance indicators of Class I plywood, and has low cost.
[0010] Optionally, the water content is 950–1050 parts by weight.
[0011] Sodium hydroxide is 10-22 parts by weight.
[0012] Polyacrylamide is present in amounts of 2 to 4 parts by weight.
[0013] The amount of lignin is 950 to 1050 parts by weight.
[0014] Optionally, the lignin activation treatment step further includes:
[0015] Add water, sodium hydroxide, and polyacrylamide to the reactor, heat to the first temperature, and mix thoroughly.
[0016] Add lignin and maintain the reaction at a second temperature for a predetermined time;
[0017] The material is cooled and discharged to obtain the activated liquid.
[0018] Optionally, the first temperature is 80-90°C, and the second temperature is 80-90°C.
[0019] Optionally, the second temperature is greater than the first temperature.
[0020] Optionally, the predetermined time is 1.5 to 2.5 hours.
[0021] Optionally, the amount of the activating solution added is 20% to 60% of the weight of the phenolic resin adhesive.
[0022] Optionally, the mixing step further includes: mixing the activation liquid and the phenolic resin adhesive and stirring for 25 to 35 minutes to obtain the lignin biomass adhesive.
[0023] The second aspect of this application provides a lignin biomass adhesive, which is prepared by the method for preparing the lignin biomass adhesive described in the first aspect above.
[0024] The lignin biomass adhesive of this application is highly environmentally friendly, can meet the performance indicators of Class I plywood, and has low cost.
[0025] A third aspect of this application provides a plywood using the lignin biomass adhesive described in the second aspect above.
[0026] The plywood according to this application is highly environmentally friendly, meets the performance indicators of Class I plywood, and is low in cost. Detailed Implementation
[0027] The following description provides numerous specific details to offer a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with this application.
[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.
[0029] The ordinal numbers such as “first” and “second” used in this application are merely identifiers and have no other meaning, such as a specific order. Furthermore, for example, the term “first component” does not imply the existence of a “second component,” and the term “second component” does not imply the existence of a “first component.” It should be noted that the terms “upper,” “lower,” “front,” “back,” “left,” “right,” “inner,” “outer,” and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.
[0031] The first aspect of this application provides a method for preparing a lignin biomass adhesive, the method comprising a lignin activation treatment step and a mixing step.
[0032] The lignin activation treatment step includes mixing water, sodium hydroxide, polyacrylamide and lignin for activation to obtain an activation solution.
[0033] The mixing step includes mixing the activating liquid with the phenolic resin adhesive evenly to obtain a lignin biomass adhesive, wherein the amount of activating liquid added is less than or equal to 60% of the weight of the phenolic resin adhesive.
[0034] Lignin is abundant in papermaking wastewater and is a biomass material; its recycling is beneficial to environmental protection. Activating lignin and adding it to phenolic resin adhesives allows it to react with free aldehydes in the adhesive during the hot pressing of plywood, reducing formaldehyde release, and also undergoes a self-crosslinking reaction, enhancing bonding strength.
[0035] The lignin biomass adhesive of this application meets the performance requirements of Class I plywood, reduces the amount of phenolic resin adhesive used, lowers the dependence on phenol, is more economical and environmentally friendly than pure phenolic resin adhesive, and has a simple production process that is easy to scale up.
[0036] Specifically, the lignin activation treatment step involves adding water, sodium hydroxide, and polyacrylamide to a reaction vessel, heating to a first temperature (80–90°C), and mixing thoroughly. Then, lignin is added and the mixture is kept at a second temperature (80–90°C) for a predetermined time (1.5–2.5 hours). Afterward, the mixture is cooled and discharged to obtain an activated liquid. Preferably, the second temperature is higher than the first temperature.
[0037] The amount of water added is 950-1050 parts by weight, the amount of sodium hydroxide added is 10-22 parts by weight, the amount of polyacrylamide added is 2-4 parts by weight, and the amount of lignin added is 950-1050 parts by weight.
[0038] The mixing step also includes: mixing the activation solution and phenolic resin adhesive and stirring for 25–35 minutes to obtain a lignin biomass adhesive. The amount of activation solution added is 20%–60% of the weight of the phenolic resin adhesive.
[0039] The present application will now be described in more detail with reference to the embodiments and comparative examples. Examples 1-5 and comparative examples 1-2 are experiments for preparing activation solutions.
[0040] Example 1
[0041] 1000 parts by weight of water, 10 parts by weight of sodium hydroxide, and 4 parts by weight of polyacrylamide were added sequentially to the reactor, mixed, and heated to 80°C. 1000 parts by weight of lignin were slowly added to the reactor, and the temperature was maintained at 90°C for 2 hours. The mixture was then cooled to 45°C, and the activated solution was discharged.
[0042] Example 2
[0043] 1000 parts by weight of water, 22 parts by weight of sodium hydroxide, and 2 parts by weight of polyacrylamide were added sequentially to the reactor, mixed, and heated to 80°C. 1000 parts by weight of lignin were slowly added to the reactor, and the reaction was maintained at 80°C for 2 hours. The mixture was then cooled to 45°C, and the activated solution was discharged.
[0044] Example 3
[0045] 1000 parts by weight of water, 22 parts by weight of sodium hydroxide, and 4 parts by weight of polyacrylamide were added sequentially to the reactor, mixed, and heated to 80°C. 1000 parts by weight of lignin were slowly added to the reactor, and the reaction was maintained at 80°C for 2 hours. The mixture was then cooled to 45°C, and the activated solution was discharged.
[0046] Example 4
[0047] 1000 parts by weight of water, 10 parts by weight of sodium hydroxide, and 2 parts by weight of polyacrylamide were added sequentially to the reactor, mixed, and heated to 90°C. 1000 parts by weight of lignin were slowly added to the reactor, and the reaction was maintained at 90°C for 2 hours. The mixture was then cooled to 45°C, and the activated solution was discharged.
[0048] Example 5
[0049] 1000 parts by weight of water, 16 parts by weight of sodium hydroxide, and 3 parts by weight of polyacrylamide were added sequentially to the reactor, mixed, and heated to 80°C. 1000 parts by weight of lignin were then slowly added to the reactor, and the reaction was maintained at 80°C for 2 hours. The mixture was then cooled to 45°C, and the activated solution was discharged.
[0050] Comparative Example 1
[0051] 1000 parts by weight of water and 22 parts by weight of sodium hydroxide were added sequentially to the reactor, mixed, and heated to 90°C. 1000 parts by weight of lignin were then slowly added to the reactor, and the reaction was maintained at 90°C for 2 hours. The mixture was then cooled to 45°C, and the activated solution was discharged.
[0052] Comparative Example 2
[0053] 1000 parts by weight of water and 4 parts by weight of polyacrylamide were added sequentially to the reactor, mixed, and heated to 90°C. 1000 parts by weight of lignin were then slowly added to the reactor, and the reaction was maintained at 90°C for 2 hours. The mixture was then cooled to 45°C, and the activated solution was discharged.
[0054] The evaluation results of the activation solutions obtained in Examples 1-5 and Comparative Examples 1-2 are shown in the table below.
[0055] Table 1
[0056]
[0057] Examples 6-10 and Comparative Examples 3-4 are experiments for preparing lignin biomass adhesives.
[0058] Example 6
[0059] Add 100 parts by weight of phenolic resin adhesive to a mixing tank, and add 20 parts by weight of the activated lignin mixture prepared in Example 1 above to the mixing tank. Stir for 30 minutes to mix evenly to obtain lignin biomass adhesive.
[0060] Example 7
[0061] Add 100 parts by weight of phenolic resin adhesive to a mixing tank, and add 30 parts by weight of the activated lignin mixture prepared in Example 1 above to the mixing tank. Stir for 30 minutes to mix evenly to obtain lignin biomass adhesive.
[0062] Example 8
[0063] Add 100 parts by weight of phenolic resin adhesive to a mixing tank, and add 40 parts by weight of the activated lignin mixture prepared in Example 1 above to the mixing tank. Stir for 30 minutes to mix evenly to obtain lignin biomass adhesive.
[0064] Example 9
[0065] Add 100 parts by weight of phenolic resin adhesive to a mixing tank, and add 50 parts by weight of the activated lignin mixture prepared in Example 1 above to the mixing tank. Stir for 30 minutes to mix evenly to obtain lignin biomass adhesive.
[0066] Example 10
[0067] Add 100 parts by weight of phenolic resin adhesive to a mixing tank, and add 60 parts by weight of the activated lignin mixture prepared in Example 1 above to the mixing tank. Stir for 30 minutes to mix evenly to obtain lignin biomass adhesive.
[0068] Comparative Example 3
[0069] Add 100 parts by weight of phenolic resin adhesive to a mixing tank, and add 10 parts by weight of the activated lignin mixture prepared in Example 1 above to the mixing tank. Stir for 30 minutes to mix evenly to obtain lignin biomass adhesive.
[0070] Comparative Example 4
[0071] Add 100 parts by weight of phenolic resin adhesive to a mixing tank, and add 70 parts by weight of the activated lignin mixture prepared in Example 1 above to the mixing tank. Stir for 30 minutes to mix evenly to obtain lignin biomass adhesive.
[0072] Plywood produced using the lignin biomass adhesives obtained in Examples 6-10 and Comparative Examples 3-4 was subjected to impregnation peel performance tests, and the evaluation results are shown in the table below.
[0073] Table 2
[0074] serial number Impregnation and peel test Example 6 Meets the requirements for Class I plywood Example 7 Meets the requirements for Class I plywood Example 8 Meets the requirements for Class I plywood Example 9 Meets the requirements for Class I plywood Example 10 Meets the requirements for Class I plywood Comparative Example 3 Meets the requirements for Class I plywood Comparative Example 4 The performance requirements for Class I plywood were not met.
[0075] When the proportion of lignin biomass adhesive added exceeds 60% of the phenolic resin adhesive, the performance cannot meet the application requirements, and the weather resistance is insufficient. When the proportion of lignin biomass adhesive added is less than 20% of the phenolic resin adhesive, although the mechanical properties can be met, the cost is not advantageous due to the low amount added.
[0076] The second aspect of this application provides a lignin biomass adhesive, which is prepared by the method of preparing the lignin biomass adhesive of the first aspect described above.
[0077] The lignin biomass adhesive of this application is highly environmentally friendly, can meet the performance indicators of Class I plywood, and has low cost.
[0078] A third aspect of this application provides a plywood using the lignin biomass adhesive described in the second aspect above.
[0079] The plywood according to this application is highly environmentally friendly, meets the performance indicators of Class I plywood, and is low in cost.
[0080] The processes and steps described in all the preferred embodiments above are merely examples. Unless adverse effects occur, various processing operations can be performed in a different order than the above-described processes. The order of steps in the above processes can also be added, combined, or deleted according to actual needs.
[0081] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application. Features described in one embodiment may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.
[0082] This application has been described through the above embodiments. However, it should be understood that the above embodiments are only for illustrative purposes. This application is not limited to the above embodiments. Many variations and modifications can be made based on the teachings of this application, and all such variations and modifications fall within the scope of protection claimed in this application.
Claims
1. A method for preparing a lignin biomass adhesive, characterized in that, The preparation method includes: The lignin activation treatment step involves mixing water, sodium hydroxide, polyacrylamide, and lignin for activation to obtain an activation solution. In the mixing step, the activating liquid and phenolic resin adhesive are mixed evenly to obtain lignin biomass adhesive, wherein the amount of activating liquid added is less than or equal to 60% of the weight of the phenolic resin adhesive.
2. The method for preparing the lignin biomass adhesive according to claim 1, characterized in that, Water is 950–1050 parts by weight. Sodium hydroxide is 10-22 parts by weight. Polyacrylamide is present in amounts of 2 to 4 parts by weight. The amount of lignin is 950 to 1050 parts by weight.
3. The method for preparing the lignin biomass adhesive according to claim 1, characterized in that, The lignin activation treatment step further includes: Add water, sodium hydroxide, and polyacrylamide to the reactor, heat to the first temperature, and mix thoroughly. Add lignin and maintain the reaction at a second temperature for a predetermined time; The material is cooled and discharged to obtain the activated liquid.
4. The method for preparing the lignin biomass adhesive according to claim 3, characterized in that, The first temperature is 80-90℃, and the second temperature is 80-90℃.
5. The method for preparing the lignin biomass adhesive according to claim 3, characterized in that, The second temperature is greater than the first temperature.
6. The method for preparing the lignin biomass adhesive according to claim 3, characterized in that, The scheduled time is 1.5 to 2.5 hours.
7. The method for preparing the lignin biomass adhesive according to claim 1, characterized in that, The amount of the activating solution added is 20% to 60% of the weight of the phenolic resin adhesive.
8. The method for preparing the lignin biomass adhesive according to claim 1, characterized in that, The mixing step further includes: mixing the activation liquid and the phenolic resin adhesive and stirring for 25 to 35 minutes to obtain the lignin biomass adhesive.
9. A lignin biomass adhesive, characterized in that, The lignin biomass adhesive is prepared by the method for preparing lignin biomass adhesive according to any one of claims 1-8.
10. A type of plywood, characterized in that, The plywood uses the lignin biomass adhesive as described in claim 9.