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Preparation method of lignin modified phenolic resin for molding compound

A technology of phenolic resin and lignin, which is applied in the field of lignin-modified phenolic resin and its preparation, can solve the problems of increasing production costs, and achieve the effects of avoiding pollution, reducing production costs, and fast reaction speed

Inactive Publication Date: 2014-02-05
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cheng Xiansu et al. used organic solvent extraction and inorganic chemical treatment to separate and purify enzymatic lignin from the residue of microbial enzymatic hydrolysis of corn stalks, and prepare biomodified hot-melt phenolic resin. This method increases production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A lignin-modified phenolic resin used in molding materials, the softening point temperature is 90°C-105°C, which can be prepared by the following method: mix phenol, acid catalyst and lignin, heat to 90°C-160°C, and react 1 -3h, lower the temperature to 70°C, add formaldehyde dropwise to the reaction system, heat to 90°C-120°C for 2-4h, and distill under reduced pressure to obtain lignin-modified phenolic resin. A lignin-modified phenolic resin is obtained. The lignin that participates in this reaction is enzymatic lignin, that is, the by-product of biofuel ethanol or butanol production, that is, the residue produced.

Embodiment 2

[0025] Add a certain amount of phenol, enzymatic lignin (33% of the mass of phenol) and oxalic acid (1% of the mass of phenol) into the reactor, the reaction temperature is 95°C, the reaction time is 2h, the temperature is lowered to 70°C, and then formaldehyde (phenolic aldehyde The molar ratio is 1:0.85), the reaction temperature is 100°C, the reaction time is 2h, and the lignin-modified phenolic resin is obtained by distillation under reduced pressure. The softening point is 93°C, the fluidity is 4.5cm, the polymerization speed is 70s, and the free phenol content is 4%.

Embodiment 3

[0027] Add a certain amount of phenol, enzymatic lignin (33% of phenol mass) and oxalic acid catalyst (3% of phenol mass) into the reactor, the reaction temperature is 130°C, the reaction time is 2h, the temperature is lowered to 70°C, and then formaldehyde ( The phenol-formaldehyde molar ratio is 1:0.85), the reaction temperature is 110°C, the reaction time is 2h, and the lignin-modified phenolic resin is obtained by distillation under reduced pressure. The softening point is 96°C, the fluidity is 4.3cm, the polymerization speed is 63s, and the free phenol content is 3.7%.

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Abstract

The invention discloses a lignin modified phenolic resin for molding compound. The lignin modified phenolic resin can be prepared by the following method: mixing phenol, an acid catalyst and enzymolysis lignin, heating to 90 DEG C-160 DEG C, liquefying for 1-3 h, cooling to 70 DEG C, then adding formaldehyde into the reaction system, heating to 90-120 DEG C, reacting for 2-4 h, and carrying out vacuum distillation to obtain the lignin modified phenolic resin. The invention uses enzymolysis lignin in rich resource to partially substitute phenol to prepare phenolic resin, so as to obviously reduce cost. The lignin modified phenolic resin provided by the invention can be used for preparing molding compound, and has high mechanical properties, heat resistance and insulation.

Description

technical field [0001] The invention relates to a phenolic resin and a preparation method thereof, in particular to a lignin-modified phenolic resin used in molding materials and a preparation method thereof. Background technique [0002] Lignin is the only non-petroleum resource that can provide renewable aryl compounds in nature, and it is the second most abundant natural polymer after cellulose in the plant kingdom. Lignin molecules have many different types of active groups, which have the advantages of being renewable, degradable, and non-toxic. Enzymatic Hydrolysis Lignin (EHL for short) is a new type of lignin extracted from the residue of fuel ethanol produced by fermentation of plant straw. At present, most of the enzymatic lignin is used for incineration, not only its components have not been effectively used, but also pollute the environment. my country now produces 600 to 700 million tons of corn stalks per year, and the residue of fuel ethanol produced by ferme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08G8/10
Inventor 周永红周静胡立红杨晓慧
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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