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Method for preparing lignin-based phenolic resin

A phenolic resin, lignin-based technology, used in aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc. The effect of industrialization promotion, green and safe modified conditions, and excellent water resistance

Pending Publication Date: 2020-08-04
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the properties of lignin-based phenolic resins prepared by most of the existing methods do not meet the relevant national standards, and it is necessary to improve the existing methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0045] The preparation of nano-lignin adopts the following steps:

Embodiment 1

[0048] Weigh 52.9g of phenol under stirring conditions, add 43mL of 8M NaOH solution (10%wt) as a catalyst into a three-necked flask, add 17.6g of nano-lignin prepared in Preparation Example 1 (the weight ratio of phenol to nano-lignin) is 2.5:7.5, and the replacement ratio of lignin is 25%). Add 82 g of a 37% formaldehyde solution by mass, and keep stirring at 65° C. for 30 min. Subsequently, 27 g of 37% formaldehyde solution by mass was added, and 7.5 g of urea and 20 mL of 8M NaOH solution (10% wt) were added and the temperature was raised to 85° C. to continue the reaction for 4 h. The synthesized lignin-based phenolic resin, which is a green adhesive, has a pH of 12.27; a solid content of 49.64%; a viscosity of 149 mPa·s; and a free formaldehyde content of 0.0287%.

[0049] According to the measurement method of type I plywood, the bonding strength of eucalyptus plywood is 1.27MPa, and the formaldehyde emission is 0.47mg / L, which conforms to the GB / T 14732-2006 standard,...

Embodiment 2

[0051] Weigh 49.35g of phenol under stirring conditions, add the NaOH solution (10%wt) of 50mL of 8M into the three-necked flask as a catalyst, add the nano-lignin 21.15g (weight ratio of phenol and nano-lignin) prepared in Preparation Example 1. is 3:7, and the replacement ratio of lignin is 30%). 91 g of formaldehyde solution with a mass percentage of 37% was added, and the mixture was kept stirring at 65° C. for 30 min. Then, 30 g of formaldehyde solution with a mass percentage of 37% was added, and 10 g of urea and 16 mL of 8M NaOH solution (10% wt) were added and the temperature was raised to 85° C. to continue the reaction for 4 h. The synthesized lignin-based phenolic resin is a green adhesive with a pH of 13.35; a solid content of 47.83%; a viscosity of 254.7 mPa·s; and a free formaldehyde content of 0.1167%.

[0052] According to the measurement method of type I plywood, the bonding strength of eucalyptus plywood is 1.30MPa, and the formaldehyde emission is 0.40mg / L,...

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Abstract

The invention belongs to the field of renewable biomass resource development and utilization, and particularly relates to a method for preparing lignin-based phenolic resin by using nano lignin as a raw material. The method comprises the following step: (S2) adding formaldehyde into nano lignin or a mixture of the nano lignin and phenol, carrying out heating reaction in the presence of an alkalinesubstance, and cooling after the reaction is finished, wherein the alkaline substance used in the step S2 is alkali metal or alkaline earth metal salt. According to the preparation method disclosed by the invention, the nano lignin-based phenolic resin is effectively prepared through a simple preparation method, and various properties of the obtained nano lignin-based phenolic resin accord with the national standard GB / T 14732-2006.

Description

technical field [0001] The invention belongs to the field of development and utilization of renewable biomass resources, in particular to a method for preparing a lignin-based phenolic resin by using nano-lignin as a raw material. Background technique [0002] Adhesives have played an important role in the timber construction industry in recent decades. Phenolic (PF) resin has the advantages of strong moisture resistance, low initial viscosity and excellent temperature stability (Guo Y, Hu L, Jia P, et al. Enhancement of thermal stability and chemical reactivity of phenolic resinameliorated by nanoSiO2). 2 [J].Korean Journal of Chemical Engineering,2018.ZhangR,Jin X,Wen X,et al.Alumina nanoparticle modified phenol-formaldehyde resinas a wood adhesive[J].International Journal of Adhesion&Adhesives,2018,81:79-82. ) has been widely used in plywood, laminate and oriented strand board manufacturing (Kalami S, Arefmanesh M, Master E, et al. Replacing 100% of phenol in phenolic ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08H7/00C09J161/14
CPCC08G8/28C08H6/00C09J161/14
Inventor 周娜陈宇龚晓武王雅李琴
Owner SHIHEZI UNIVERSITY
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