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Biomass-based phenolic resin adhesive and preparation method thereof

A technology based on phenolic resin and based phenolic resin, applied in the field of biomass-based phenolic resin adhesive and its preparation, can solve the problems of harsh reaction conditions, complicated production process, increased production cost, etc., and achieve high bonding strength and production The effect of cost reduction and increase of production cost

Active Publication Date: 2022-05-10
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the patented technology has the following problems: (1) The bonding strength is slightly weak; (2) The production process is complicated and the reaction conditions are relatively harsh
The production efficiency of this patent is low in the process of preparing nano lignin; it is necessary to add a large amount of water to the lignin and ultrasonically treat it to obtain a nano lignin dispersion with a very low content. It must be repeatedly prepared to obtain a sufficient amount of nano lignin. Lignin raw materials are used to replace formaldehyde; and filtration methods such as centrifugation are required to remove excess water, which increases production costs

Method used

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  • Biomass-based phenolic resin adhesive and preparation method thereof
  • Biomass-based phenolic resin adhesive and preparation method thereof
  • Biomass-based phenolic resin adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: Take 10g of corn stalks and add them to 100g of 0.7mol / L sulfuric acid solution, and react at 130°C for 3 hours at a stirring rate of 500rpm to obtain a corn stalk hydrolyzate, add alkali to adjust to neutral, and set aside;

[0036] Step 2: Take 3.4g of corn stalk hydrolyzate and 175.7g of 37% formaldehyde in step 1 (mass ratio of corn stalk hydrolyzate to formaldehyde is 1:19) and stir at room temperature for 10min to make a mixture; take two-thirds The mixed solution, 94g phenol and 56g 8mol / L sodium hydroxide solution were added to the reactor, and reacted for 10min at 65°C; continue to add the remaining mixed solution and 24g 8mol / L sodium hydroxide solution to the reactor, React at 85° C. for 3.5 hours; add 13.5 g of urea into the reactor, react at 85° C. for 30 minutes, and rapidly cool to room temperature to obtain a biomass-based phenolic resin adhesive.

[0037] Two-layer poplar plywood was pressed, and its performance was tested. The results are liste...

Embodiment 2

[0039] Step 1: Take 20g of corncobs and add them to 200g of 1mol / L sulfuric acid solution, react at 150°C with a stirring rate of 600rpm for 2 hours to obtain a corncob hydrolyzate, add alkali to adjust to neutral, and set aside;

[0040] Step 2: Take 5.8g of corncob hydrolyzate and 140g of 37% formaldehyde in step 1 (mass ratio of corncob hydrolyzate to formaldehyde is 1:9) and stir at room temperature for 15min to make a mixed solution; take two-thirds of Add the mixed solution, 54g phenol and 30g 8mol / L sodium hydroxide solution into the reactor, and react at 70°C for 15min; continue to add the remaining mixed solution and 15g 8mol / L sodium hydroxide solution in the reactor, React at ℃ for 4 hours; add 8g of ammonia water to the reactor, react at 85℃ for 30min, and rapidly cool to room temperature to obtain a biomass-based phenolic resin adhesive.

[0041] Two-layer poplar plywood was pressed, and its performance was tested. The results are listed in Table 1.

Embodiment 3

[0043] Step 1: Take 25g of corncobs and add 500g of sodium hydroxide / urea mixed solution (sodium hydroxide: urea: water: 7:12:81) and stir for 3 hours at -10°C, centrifuge the obtained product to obtain the supernatant, and upward 50 mL of distilled water was added dropwise to the clear liquid, dialyzed to neutrality, and the obtained product was dried to obtain nanocellulose.

[0044] Step 2: Take 11g of nanocellulose in step 1 and 118.8g of 37% formaldehyde (mass ratio of nanocellulose to formaldehyde is 1:4) and stir at room temperature for 20min to make a mixed solution; take two-thirds of the mixed solution , 94g phenol and 44.8g 8mol / L sodium hydroxide solution were added to the reactor, and reacted for 10min at 70°C; continue to add the remaining mixed solution and 22.4g 8mol / L sodium hydroxide solution to the reactor, and React at 85°C for 3h; add 13.5g of urea into the reactor, react at 90°C for 35min, and cool down to room temperature rapidly to obtain a biomass-base...

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Abstract

The invention relates to a biomass-based phenolic resin adhesive and a preparation method thereof.The biomass-based phenolic resin adhesive is prepared from biomass hydrolysate or nanocellulose, formaldehyde, phenol, a basic catalyst and a formaldehyde catching agent. The biomass hydrolysis product or the nano cellulose is used for replacing formaldehyde to synthesize the biomass-based phenolic resin adhesive, the plywood obtained by pressing the adhesive and a wood board has excellent bonding performance, the bonding strength of the plywood obtained by pressing the biomass-based phenolic resin adhesive is 0.88-1.45 MPa, and the bonding strength of the plywood obtained by pressing the biomass-based phenolic resin adhesive is 0.88-1.45 MPa. The bonding strength is 1.2-2.0 times of that of common phenolic resin, and is higher than the requirements of national class-I plates.

Description

technical field [0001] The invention relates to the technical field of phenolic resins, in particular to a biomass-based phenolic resin adhesive and a preparation method thereof. Background technique [0002] Phenolic resin (PF) is the first resin to be industrialized in the world. Because of its excellent mechanical properties, water resistance, and low price, it is widely used as wood glue for the manufacture of particleboard, plywood, and oriented strand board (OSB). adhesive. The main synthetic raw materials of traditional phenolic resin adhesives are fossil-based phenol and formaldehyde, which are not only non-renewable, but also harmful to the human body and the environment. Therefore, the use of renewable biomass-based products to replace fossil-based products to synthesize phenolic resin adhesives has become a research hotspot in recent years. [0003] Lignocellulosic biomass contains a large amount of lignin, cellulose and hemicellulose. Lignin contains phenolic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/14C08G8/28
CPCC09J161/14C08G8/28
Inventor 周娜龚晓武杨高山白兰莉杨凯艳贾鑫王昕洋
Owner SHIHEZI UNIVERSITY
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